2005-04-17 06:20:36 +08:00
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/*
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* linux/drivers/char/serial167.c
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*
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* Driver for MVME166/7 board serial ports, which are via a CD2401.
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* Based very much on cyclades.c.
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*
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* MVME166/7 work by Richard Hirst [richard@sleepie.demon.co.uk]
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*
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* ==============================================================
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*
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* static char rcsid[] =
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* "$Revision: 1.36.1.4 $$Date: 1995/03/29 06:14:14 $";
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*
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* linux/kernel/cyclades.c
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*
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* Maintained by Marcio Saito (cyclades@netcom.com) and
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* Randolph Bentson (bentson@grieg.seaslug.org)
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*
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* Much of the design and some of the code came from serial.c
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* which was copyright (C) 1991, 1992 Linus Torvalds. It was
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* extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
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* and then fixed as suggested by Michael K. Johnson 12/12/92.
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*
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* This version does not support shared irq's.
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*
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* $Log: cyclades.c,v $
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* Revision 1.36.1.4 1995/03/29 06:14:14 bentson
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* disambiguate between Cyclom-16Y and Cyclom-32Ye;
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*
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* Changes:
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*
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* 200 lines of changes record removed - RGH 11-10-95, starting work on
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* converting this to drive serial ports on mvme166 (cd2401).
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*
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 2000/08/25
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* - get rid of verify_area
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* - use get_user to access memory from userspace in set_threshold,
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* set_default_threshold and set_timeout
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* - don't use the panic function in serial167_init
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* - do resource release on failure on serial167_init
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* - include missing restore_flags in mvme167_serial_console_setup
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*
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* Kars de Jong <jongk@linux-m68k.org> - 2004/09/06
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* - replace bottom half handler with task queue handler
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*/
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/tty.h>
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#include <linux/interrupt.h>
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#include <linux/serial.h>
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#include <linux/serialP.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/serial167.h>
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#include <linux/delay.h>
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#include <linux/major.h>
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#include <linux/mm.h>
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#include <linux/console.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/mvme16xhw.h>
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#include <asm/bootinfo.h>
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#include <asm/setup.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <asm/uaccess.h>
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#include <linux/init.h>
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#define SERIAL_PARANOIA_CHECK
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#undef SERIAL_DEBUG_OPEN
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#undef SERIAL_DEBUG_THROTTLE
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#undef SERIAL_DEBUG_OTHER
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#undef SERIAL_DEBUG_IO
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#undef SERIAL_DEBUG_COUNT
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#undef SERIAL_DEBUG_DTR
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#undef CYCLOM_16Y_HACK
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#define CYCLOM_ENABLE_MONITORING
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#define WAKEUP_CHARS 256
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#define STD_COM_FLAGS (0)
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#define SERIAL_TYPE_NORMAL 1
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static struct tty_driver *cy_serial_driver;
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extern int serial_console;
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static struct cyclades_port *serial_console_info = NULL;
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static unsigned int serial_console_cflag = 0;
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u_char initial_console_speed;
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/* Base address of cd2401 chip on mvme166/7 */
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#define BASE_ADDR (0xfff45000)
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#define pcc2chip ((volatile u_char *)0xfff42000)
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#define PccSCCMICR 0x1d
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#define PccSCCTICR 0x1e
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#define PccSCCRICR 0x1f
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#define PccTPIACKR 0x25
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#define PccRPIACKR 0x27
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#define PccIMLR 0x3f
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/* This is the per-port data structure */
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struct cyclades_port cy_port[] = {
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/* CARD# */
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{-1 }, /* ttyS0 */
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{-1 }, /* ttyS1 */
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{-1 }, /* ttyS2 */
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{-1 }, /* ttyS3 */
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};
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2006-01-10 12:54:02 +08:00
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#define NR_PORTS ARRAY_SIZE(cy_port)
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2005-04-17 06:20:36 +08:00
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/*
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* tmp_buf is used as a temporary buffer by serial_write. We need to
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* lock it in case the copy_from_user blocks while swapping in a page,
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* and some other program tries to do a serial write at the same time.
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* Since the lock will only come under contention when the system is
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* swapping and available memory is low, it makes sense to share one
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* buffer across all the serial ports, since it significantly saves
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* memory if large numbers of serial ports are open.
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*/
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static unsigned char *tmp_buf = 0;
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/*
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* This is used to look up the divisor speeds and the timeouts
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* We're normally limited to 15 distinct baud rates. The extra
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* are accessed via settings in info->flags.
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* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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* 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
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* HI VHI
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*/
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static int baud_table[] = {
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0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
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1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800,115200,150000,
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0};
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#if 0
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static char baud_co[] = { /* 25 MHz clock option table */
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/* value => 00 01 02 03 04 */
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/* divide by 8 32 128 512 2048 */
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0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x02,
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0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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static char baud_bpr[] = { /* 25 MHz baud rate period table */
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0x00, 0xf5, 0xa3, 0x6f, 0x5c, 0x51, 0xf5, 0xa3, 0x51, 0xa3,
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0x6d, 0x51, 0xa3, 0x51, 0xa3, 0x51, 0x36, 0x29, 0x1b, 0x15};
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#endif
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/* I think 166 brd clocks 2401 at 20MHz.... */
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/* These values are written directly to tcor, and >> 5 for writing to rcor */
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static u_char baud_co[] = { /* 20 MHz clock option table */
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0x00, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x60, 0x60, 0x40,
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0x40, 0x40, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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/* These values written directly to tbpr/rbpr */
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static u_char baud_bpr[] = { /* 20 MHz baud rate period table */
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0x00, 0xc0, 0x80, 0x58, 0x6c, 0x40, 0xc0, 0x81, 0x40, 0x81,
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0x57, 0x40, 0x81, 0x40, 0x81, 0x40, 0x2b, 0x20, 0x15, 0x10};
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static u_char baud_cor4[] = { /* receive threshold */
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0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
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0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x08, 0x08, 0x07};
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static void shutdown(struct cyclades_port *);
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static int startup (struct cyclades_port *);
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static void cy_throttle(struct tty_struct *);
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static void cy_unthrottle(struct tty_struct *);
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static void config_setup(struct cyclades_port *);
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extern void console_print(const char *);
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#ifdef CYCLOM_SHOW_STATUS
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static void show_status(int);
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#endif
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#ifdef CONFIG_REMOTE_DEBUG
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static void debug_setup(void);
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void queueDebugChar (int c);
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int getDebugChar(void);
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#define DEBUG_PORT 1
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#define DEBUG_LEN 256
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typedef struct {
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int in;
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int out;
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unsigned char buf[DEBUG_LEN];
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} debugq;
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debugq debugiq;
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#endif
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/*
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* I have my own version of udelay(), as it is needed when initialising
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* the chip, before the delay loop has been calibrated. Should probably
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* reference one of the vmechip2 or pccchip2 counter for an accurate
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* delay, but this wild guess will do for now.
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*/
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void my_udelay (long us)
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{
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u_char x;
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volatile u_char *p = &x;
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int i;
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while (us--)
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for (i = 100; i; i--)
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x |= *p;
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}
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static inline int
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serial_paranoia_check(struct cyclades_port *info, char *name,
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const char *routine)
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{
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#ifdef SERIAL_PARANOIA_CHECK
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static const char *badmagic =
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"Warning: bad magic number for serial struct (%s) in %s\n";
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static const char *badinfo =
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"Warning: null cyclades_port for (%s) in %s\n";
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static const char *badrange =
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"Warning: cyclades_port out of range for (%s) in %s\n";
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if (!info) {
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printk(badinfo, name, routine);
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return 1;
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}
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if( (long)info < (long)(&cy_port[0])
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|| (long)(&cy_port[NR_PORTS]) < (long)info ){
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printk(badrange, name, routine);
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return 1;
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}
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if (info->magic != CYCLADES_MAGIC) {
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printk(badmagic, name, routine);
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return 1;
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}
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#endif
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return 0;
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} /* serial_paranoia_check */
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#if 0
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/* The following diagnostic routines allow the driver to spew
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information on the screen, even (especially!) during interrupts.
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*/
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void
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SP(char *data){
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unsigned long flags;
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local_irq_save(flags);
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console_print(data);
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local_irq_restore(flags);
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}
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char scrn[2];
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void
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CP(char data){
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unsigned long flags;
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local_irq_save(flags);
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scrn[0] = data;
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console_print(scrn);
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local_irq_restore(flags);
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}/* CP */
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void CP1(int data) { (data<10)? CP(data+'0'): CP(data+'A'-10); }/* CP1 */
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void CP2(int data) { CP1((data>>4) & 0x0f); CP1( data & 0x0f); }/* CP2 */
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void CP4(int data) { CP2((data>>8) & 0xff); CP2(data & 0xff); }/* CP4 */
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void CP8(long data) { CP4((data>>16) & 0xffff); CP4(data & 0xffff); }/* CP8 */
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#endif
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/* This routine waits up to 1000 micro-seconds for the previous
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command to the Cirrus chip to complete and then issues the
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new command. An error is returned if the previous command
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didn't finish within the time limit.
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*/
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u_short
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write_cy_cmd(volatile u_char *base_addr, u_char cmd)
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{
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unsigned long flags;
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volatile int i;
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local_irq_save(flags);
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/* Check to see that the previous command has completed */
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for(i = 0 ; i < 100 ; i++){
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if (base_addr[CyCCR] == 0){
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break;
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}
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my_udelay(10L);
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}
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/* if the CCR never cleared, the previous command
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didn't finish within the "reasonable time" */
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if ( i == 10 ) {
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local_irq_restore(flags);
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return (-1);
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}
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/* Issue the new command */
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base_addr[CyCCR] = cmd;
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local_irq_restore(flags);
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return(0);
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} /* write_cy_cmd */
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/* cy_start and cy_stop provide software output flow control as a
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function of XON/XOFF, software CTS, and other such stuff. */
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static void
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cy_stop(struct tty_struct *tty)
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{
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struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
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volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
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int channel;
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unsigned long flags;
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#ifdef SERIAL_DEBUG_OTHER
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printk("cy_stop %s\n", tty->name); /* */
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#endif
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if (serial_paranoia_check(info, tty->name, "cy_stop"))
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return;
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channel = info->line;
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local_irq_save(flags);
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base_addr[CyCAR] = (u_char)(channel); /* index channel */
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base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
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local_irq_restore(flags);
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return;
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} /* cy_stop */
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static void
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cy_start(struct tty_struct *tty)
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{
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struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
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volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
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int channel;
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unsigned long flags;
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#ifdef SERIAL_DEBUG_OTHER
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printk("cy_start %s\n", tty->name); /* */
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#endif
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if (serial_paranoia_check(info, tty->name, "cy_start"))
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return;
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channel = info->line;
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local_irq_save(flags);
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|
|
base_addr[CyCAR] = (u_char)(channel);
|
|
|
|
base_addr[CyIER] |= CyTxMpty;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
return;
|
|
|
|
} /* cy_start */
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine is used by the interrupt handler to schedule
|
|
|
|
* processing in the software interrupt portion of the driver
|
|
|
|
* (also known as the "bottom half"). This can be called any
|
|
|
|
* number of times for any channel without harm.
|
|
|
|
*/
|
|
|
|
static inline void
|
|
|
|
cy_sched_event(struct cyclades_port *info, int event)
|
|
|
|
{
|
|
|
|
info->event |= 1 << event; /* remember what kind of event and who */
|
|
|
|
schedule_work(&info->tqueue);
|
|
|
|
} /* cy_sched_event */
|
|
|
|
|
|
|
|
|
|
|
|
/* The real interrupt service routines are called
|
|
|
|
whenever the card wants its hand held--chars
|
|
|
|
received, out buffer empty, modem change, etc.
|
|
|
|
*/
|
|
|
|
static irqreturn_t
|
|
|
|
cd2401_rxerr_interrupt(int irq, void *dev_id, struct pt_regs *fp)
|
|
|
|
{
|
|
|
|
struct tty_struct *tty;
|
|
|
|
struct cyclades_port *info;
|
|
|
|
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
|
|
|
|
unsigned char err, rfoc;
|
|
|
|
int channel;
|
|
|
|
char data;
|
|
|
|
|
|
|
|
/* determine the channel and change to that context */
|
|
|
|
channel = (u_short ) (base_addr[CyLICR] >> 2);
|
|
|
|
info = &cy_port[channel];
|
|
|
|
info->last_active = jiffies;
|
|
|
|
|
|
|
|
if ((err = base_addr[CyRISR]) & CyTIMEOUT) {
|
|
|
|
/* This is a receive timeout interrupt, ignore it */
|
|
|
|
base_addr[CyREOIR] = CyNOTRANS;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read a byte of data if there is any - assume the error
|
|
|
|
* is associated with this character */
|
|
|
|
|
|
|
|
if ((rfoc = base_addr[CyRFOC]) != 0)
|
|
|
|
data = base_addr[CyRDR];
|
|
|
|
else
|
|
|
|
data = 0;
|
|
|
|
|
|
|
|
/* if there is nowhere to put the data, discard it */
|
|
|
|
if(info->tty == 0) {
|
|
|
|
base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
else { /* there is an open port for this data */
|
|
|
|
tty = info->tty;
|
|
|
|
if(err & info->ignore_status_mask){
|
|
|
|
base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
if (tty_buffer_request_room(tty, 1) != 0){
|
2005-04-17 06:20:36 +08:00
|
|
|
if (err & info->read_status_mask){
|
|
|
|
if(err & CyBREAK){
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
tty_insert_flip_char(tty, data, TTY_BREAK);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (info->flags & ASYNC_SAK){
|
|
|
|
do_SAK(tty);
|
|
|
|
}
|
|
|
|
}else if(err & CyFRAME){
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
tty_insert_flip_char(tty, data, TTY_FRAME);
|
2005-04-17 06:20:36 +08:00
|
|
|
}else if(err & CyPARITY){
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
tty_insert_flip_char(tty, data, TTY_PARITY);
|
2005-04-17 06:20:36 +08:00
|
|
|
}else if(err & CyOVERRUN){
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
If the flip buffer itself is
|
|
|
|
overflowing, we still loose
|
|
|
|
the next incoming character.
|
|
|
|
*/
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
tty_insert_flip_char(tty, data, TTY_NORMAL);
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
/* These two conditions may imply */
|
|
|
|
/* a normal read should be done. */
|
|
|
|
/* else if(data & CyTIMEOUT) */
|
|
|
|
/* else if(data & CySPECHAR) */
|
|
|
|
}else{
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
tty_insert_flip_char(tty, 0, TTY_NORMAL);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}else{
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
tty_insert_flip_char(tty, data, TTY_NORMAL);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}else{
|
|
|
|
/* there was a software buffer overrun
|
|
|
|
and nothing could be done about it!!! */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
schedule_delayed_work(&tty->flip.work, 1);
|
|
|
|
/* end of service */
|
|
|
|
base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
} /* cy_rxerr_interrupt */
|
|
|
|
|
|
|
|
static irqreturn_t
|
|
|
|
cd2401_modem_interrupt(int irq, void *dev_id, struct pt_regs *fp)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info;
|
|
|
|
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
int mdm_change;
|
|
|
|
int mdm_status;
|
|
|
|
|
|
|
|
|
|
|
|
/* determine the channel and change to that context */
|
|
|
|
channel = (u_short ) (base_addr[CyLICR] >> 2);
|
|
|
|
info = &cy_port[channel];
|
|
|
|
info->last_active = jiffies;
|
|
|
|
|
|
|
|
mdm_change = base_addr[CyMISR];
|
|
|
|
mdm_status = base_addr[CyMSVR1];
|
|
|
|
|
|
|
|
if(info->tty == 0){ /* nowhere to put the data, ignore it */
|
|
|
|
;
|
|
|
|
}else{
|
|
|
|
if((mdm_change & CyDCD)
|
|
|
|
&& (info->flags & ASYNC_CHECK_CD)){
|
|
|
|
if(mdm_status & CyDCD){
|
|
|
|
/* CP('!'); */
|
|
|
|
cy_sched_event(info, Cy_EVENT_OPEN_WAKEUP);
|
|
|
|
} else {
|
|
|
|
/* CP('@'); */
|
|
|
|
cy_sched_event(info, Cy_EVENT_HANGUP);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if((mdm_change & CyCTS)
|
|
|
|
&& (info->flags & ASYNC_CTS_FLOW)){
|
|
|
|
if(info->tty->stopped){
|
|
|
|
if(mdm_status & CyCTS){
|
|
|
|
/* !!! cy_start isn't used because... */
|
|
|
|
info->tty->stopped = 0;
|
|
|
|
base_addr[CyIER] |= CyTxMpty;
|
|
|
|
cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
|
|
|
|
}
|
|
|
|
}else{
|
|
|
|
if(!(mdm_status & CyCTS)){
|
|
|
|
/* !!! cy_stop isn't used because... */
|
|
|
|
info->tty->stopped = 1;
|
|
|
|
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if(mdm_status & CyDSR){
|
|
|
|
}
|
|
|
|
}
|
|
|
|
base_addr[CyMEOIR] = 0;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
} /* cy_modem_interrupt */
|
|
|
|
|
|
|
|
static irqreturn_t
|
|
|
|
cd2401_tx_interrupt(int irq, void *dev_id, struct pt_regs *fp)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info;
|
|
|
|
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
int char_count, saved_cnt;
|
|
|
|
int outch;
|
|
|
|
|
|
|
|
/* determine the channel and change to that context */
|
|
|
|
channel = (u_short ) (base_addr[CyLICR] >> 2);
|
|
|
|
|
|
|
|
#ifdef CONFIG_REMOTE_DEBUG
|
|
|
|
if (channel == DEBUG_PORT) {
|
|
|
|
panic ("TxInt on debug port!!!");
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
info = &cy_port[channel];
|
|
|
|
|
|
|
|
/* validate the port number (as configured and open) */
|
|
|
|
if( (channel < 0) || (NR_PORTS <= channel) ){
|
|
|
|
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
|
|
|
|
base_addr[CyTEOIR] = CyNOTRANS;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
info->last_active = jiffies;
|
|
|
|
if(info->tty == 0){
|
|
|
|
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
|
|
|
|
if (info->xmit_cnt < WAKEUP_CHARS) {
|
|
|
|
cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
|
|
|
|
}
|
|
|
|
base_addr[CyTEOIR] = CyNOTRANS;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* load the on-chip space available for outbound data */
|
|
|
|
saved_cnt = char_count = base_addr[CyTFTC];
|
|
|
|
|
|
|
|
if(info->x_char) { /* send special char */
|
|
|
|
outch = info->x_char;
|
|
|
|
base_addr[CyTDR] = outch;
|
|
|
|
char_count--;
|
|
|
|
info->x_char = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (info->x_break){
|
|
|
|
/* The Cirrus chip requires the "Embedded Transmit
|
|
|
|
Commands" of start break, delay, and end break
|
|
|
|
sequences to be sent. The duration of the
|
|
|
|
break is given in TICs, which runs at HZ
|
|
|
|
(typically 100) and the PPR runs at 200 Hz,
|
|
|
|
so the delay is duration * 200/HZ, and thus a
|
|
|
|
break can run from 1/100 sec to about 5/4 sec.
|
|
|
|
Need to check these values - RGH 141095.
|
|
|
|
*/
|
|
|
|
base_addr[CyTDR] = 0; /* start break */
|
|
|
|
base_addr[CyTDR] = 0x81;
|
|
|
|
base_addr[CyTDR] = 0; /* delay a bit */
|
|
|
|
base_addr[CyTDR] = 0x82;
|
|
|
|
base_addr[CyTDR] = info->x_break*200/HZ;
|
|
|
|
base_addr[CyTDR] = 0; /* terminate break */
|
|
|
|
base_addr[CyTDR] = 0x83;
|
|
|
|
char_count -= 7;
|
|
|
|
info->x_break = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
while (char_count > 0){
|
|
|
|
if (!info->xmit_cnt){
|
|
|
|
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (info->xmit_buf == 0){
|
|
|
|
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (info->tty->stopped || info->tty->hw_stopped){
|
|
|
|
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/* Because the Embedded Transmit Commands have been
|
|
|
|
enabled, we must check to see if the escape
|
|
|
|
character, NULL, is being sent. If it is, we
|
|
|
|
must ensure that there is room for it to be
|
|
|
|
doubled in the output stream. Therefore we
|
|
|
|
no longer advance the pointer when the character
|
|
|
|
is fetched, but rather wait until after the check
|
|
|
|
for a NULL output character. (This is necessary
|
|
|
|
because there may not be room for the two chars
|
|
|
|
needed to send a NULL.
|
|
|
|
*/
|
|
|
|
outch = info->xmit_buf[info->xmit_tail];
|
|
|
|
if( outch ){
|
|
|
|
info->xmit_cnt--;
|
|
|
|
info->xmit_tail = (info->xmit_tail + 1)
|
|
|
|
& (PAGE_SIZE - 1);
|
|
|
|
base_addr[CyTDR] = outch;
|
|
|
|
char_count--;
|
|
|
|
}else{
|
|
|
|
if(char_count > 1){
|
|
|
|
info->xmit_cnt--;
|
|
|
|
info->xmit_tail = (info->xmit_tail + 1)
|
|
|
|
& (PAGE_SIZE - 1);
|
|
|
|
base_addr[CyTDR] = outch;
|
|
|
|
base_addr[CyTDR] = 0;
|
|
|
|
char_count--;
|
|
|
|
char_count--;
|
|
|
|
}else{
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (info->xmit_cnt < WAKEUP_CHARS) {
|
|
|
|
cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
|
|
|
|
}
|
|
|
|
base_addr[CyTEOIR] = (char_count != saved_cnt) ? 0 : CyNOTRANS;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
} /* cy_tx_interrupt */
|
|
|
|
|
|
|
|
static irqreturn_t
|
|
|
|
cd2401_rx_interrupt(int irq, void *dev_id, struct pt_regs *fp)
|
|
|
|
{
|
|
|
|
struct tty_struct *tty;
|
|
|
|
struct cyclades_port *info;
|
|
|
|
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
char data;
|
|
|
|
int char_count;
|
|
|
|
int save_cnt;
|
|
|
|
|
|
|
|
/* determine the channel and change to that context */
|
|
|
|
channel = (u_short ) (base_addr[CyLICR] >> 2);
|
|
|
|
info = &cy_port[channel];
|
|
|
|
info->last_active = jiffies;
|
|
|
|
save_cnt = char_count = base_addr[CyRFOC];
|
|
|
|
|
|
|
|
#ifdef CONFIG_REMOTE_DEBUG
|
|
|
|
if (channel == DEBUG_PORT) {
|
|
|
|
while (char_count--) {
|
|
|
|
data = base_addr[CyRDR];
|
|
|
|
queueDebugChar(data);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
#endif
|
|
|
|
/* if there is nowhere to put the data, discard it */
|
|
|
|
if(info->tty == 0){
|
|
|
|
while(char_count--){
|
|
|
|
data = base_addr[CyRDR];
|
|
|
|
}
|
|
|
|
}else{ /* there is an open port for this data */
|
|
|
|
tty = info->tty;
|
|
|
|
/* load # characters available from the chip */
|
|
|
|
|
|
|
|
#ifdef CYCLOM_ENABLE_MONITORING
|
|
|
|
++info->mon.int_count;
|
|
|
|
info->mon.char_count += char_count;
|
|
|
|
if (char_count > info->mon.char_max)
|
|
|
|
info->mon.char_max = char_count;
|
|
|
|
info->mon.char_last = char_count;
|
|
|
|
#endif
|
|
|
|
while(char_count--){
|
|
|
|
data = base_addr[CyRDR];
|
[PATCH] TTY layer buffering revamp
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.
This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.
When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.
For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).
Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.
The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.
I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.
Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real. That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.
Description:
tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification]. It
does now also return the number of chars inserted
There are also
tty_buffer_request_room(tty, len)
which asks for a buffer block of the length requested and returns the space
found. This improves efficiency with hardware that knows how much to
transfer.
and tty_insert_flip_string_flags(tty, str, flags, len)
to insert a string of characters and flags
For a smart interface the usual code is
len = tty_request_buffer_room(tty, amount_hardware_says);
tty_insert_flip_string(tty, buffer_from_card, len);
More description!
At the moment tty buffers are attached directly to the tty. This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)
I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers. This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.
So far so good. Lots of drivers reference tty->flip.*. Several of them also
call directly and unsafely into function pointers it provides. This will all
break. Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.
At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say
int tty_buffer_request_room(tty, size)
Try and ensure at least size bytes are available, returns actual room (may be
zero). At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative. (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space. The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.
int tty_insert_flip_char(tty, ch, flag)
As before insert a character if there is room. Now returns 1 for success, 0
for failure.
int tty_insert_flip_string(tty, str, len)
Insert a block of non error characters. Returns the number inserted.
int tty_prepare_flip_string(tty, strptr, len)
Adjust the buffer to allow len characters to be added. Returns a buffer
pointer in strptr and the length available. This allows for hardware that
needs to use functions like insl or mencpy_fromio.
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
|
|
|
tty_insert_flip_char(tty, data, TTY_NORMAL);
|
2005-04-17 06:20:36 +08:00
|
|
|
#ifdef CYCLOM_16Y_HACK
|
|
|
|
udelay(10L);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
schedule_delayed_work(&tty->flip.work, 1);
|
|
|
|
}
|
|
|
|
/* end of service */
|
|
|
|
base_addr[CyREOIR] = save_cnt ? 0 : CyNOTRANS;
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
} /* cy_rx_interrupt */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine is used to handle the "bottom half" processing for the
|
|
|
|
* serial driver, known also the "software interrupt" processing.
|
|
|
|
* This processing is done at the kernel interrupt level, after the
|
|
|
|
* cy#/_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
|
|
|
|
* is where time-consuming activities which can not be done in the
|
|
|
|
* interrupt driver proper are done; the interrupt driver schedules
|
|
|
|
* them using cy_sched_event(), and they get done here.
|
|
|
|
*
|
|
|
|
* This is done through one level of indirection--the task queue.
|
|
|
|
* When a hardware interrupt service routine wants service by the
|
|
|
|
* driver's bottom half, it enqueues the appropriate tq_struct (one
|
|
|
|
* per port) to the keventd work queue and sets a request flag
|
|
|
|
* that the work queue be processed.
|
|
|
|
*
|
|
|
|
* Although this may seem unwieldy, it gives the system a way to
|
|
|
|
* pass an argument (in this case the pointer to the cyclades_port
|
|
|
|
* structure) to the bottom half of the driver. Previous kernels
|
|
|
|
* had to poll every port to see if that port needed servicing.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
do_softint(void *private_)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *) private_;
|
|
|
|
struct tty_struct *tty;
|
|
|
|
|
|
|
|
tty = info->tty;
|
|
|
|
if (!tty)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (test_and_clear_bit(Cy_EVENT_HANGUP, &info->event)) {
|
|
|
|
tty_hangup(info->tty);
|
|
|
|
wake_up_interruptible(&info->open_wait);
|
|
|
|
info->flags &= ~ASYNC_NORMAL_ACTIVE;
|
|
|
|
}
|
|
|
|
if (test_and_clear_bit(Cy_EVENT_OPEN_WAKEUP, &info->event)) {
|
|
|
|
wake_up_interruptible(&info->open_wait);
|
|
|
|
}
|
|
|
|
if (test_and_clear_bit(Cy_EVENT_WRITE_WAKEUP, &info->event)) {
|
|
|
|
tty_wakeup(tty);
|
|
|
|
}
|
|
|
|
} /* do_softint */
|
|
|
|
|
|
|
|
|
|
|
|
/* This is called whenever a port becomes active;
|
|
|
|
interrupts are enabled and DTR & RTS are turned on.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
startup(struct cyclades_port * info)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
|
|
|
|
if (info->flags & ASYNC_INITIALIZED){
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!info->type){
|
|
|
|
if (info->tty){
|
|
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (!info->xmit_buf){
|
|
|
|
info->xmit_buf = (unsigned char *) get_zeroed_page (GFP_KERNEL);
|
|
|
|
if (!info->xmit_buf){
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
config_setup(info);
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("startup channel %d\n", channel);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
write_cy_cmd(base_addr,CyENB_RCVR|CyENB_XMTR);
|
|
|
|
|
|
|
|
base_addr[CyCAR] = (u_char)channel; /* !!! Is this needed? */
|
|
|
|
base_addr[CyMSVR1] = CyRTS;
|
|
|
|
/* CP('S');CP('1'); */
|
|
|
|
base_addr[CyMSVR2] = CyDTR;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_DTR
|
|
|
|
printk("cyc: %d: raising DTR\n", __LINE__);
|
|
|
|
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
base_addr[CyIER] |= CyRxData;
|
|
|
|
info->flags |= ASYNC_INITIALIZED;
|
|
|
|
|
|
|
|
if (info->tty){
|
|
|
|
clear_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
|
|
}
|
|
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk(" done\n");
|
|
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
} /* startup */
|
|
|
|
|
|
|
|
void
|
|
|
|
start_xmit( struct cyclades_port *info )
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = channel;
|
|
|
|
base_addr[CyIER] |= CyTxMpty;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
} /* start_xmit */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine shuts down a serial port; interrupts are disabled,
|
|
|
|
* and DTR is dropped if the hangup on close termio flag is on.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
shutdown(struct cyclades_port * info)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
|
|
|
|
if (!(info->flags & ASYNC_INITIALIZED)){
|
|
|
|
/* CP('$'); */
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("shutdown channel %d\n", channel);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* !!! REALLY MUST WAIT FOR LAST CHARACTER TO BE
|
|
|
|
SENT BEFORE DROPPING THE LINE !!! (Perhaps
|
|
|
|
set some flag that is read when XMTY happens.)
|
|
|
|
Other choices are to delay some fixed interval
|
|
|
|
or schedule some later processing.
|
|
|
|
*/
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (info->xmit_buf){
|
|
|
|
free_page((unsigned long) info->xmit_buf);
|
|
|
|
info->xmit_buf = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
|
|
|
|
base_addr[CyMSVR1] = 0;
|
|
|
|
/* CP('C');CP('1'); */
|
|
|
|
base_addr[CyMSVR2] = 0;
|
|
|
|
#ifdef SERIAL_DEBUG_DTR
|
|
|
|
printk("cyc: %d: dropping DTR\n", __LINE__);
|
|
|
|
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
write_cy_cmd(base_addr,CyDIS_RCVR);
|
|
|
|
/* it may be appropriate to clear _XMIT at
|
|
|
|
some later date (after testing)!!! */
|
|
|
|
|
|
|
|
if (info->tty){
|
|
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
|
|
}
|
|
|
|
info->flags &= ~ASYNC_INITIALIZED;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk(" done\n");
|
|
|
|
#endif
|
|
|
|
return;
|
|
|
|
} /* shutdown */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine finds or computes the various line characteristics.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
config_setup(struct cyclades_port * info)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
unsigned cflag;
|
|
|
|
int i;
|
|
|
|
unsigned char ti, need_init_chan = 0;
|
|
|
|
|
|
|
|
if (!info->tty || !info->tty->termios){
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (info->line == -1){
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
cflag = info->tty->termios->c_cflag;
|
|
|
|
|
|
|
|
/* baud rate */
|
|
|
|
i = cflag & CBAUD;
|
|
|
|
#ifdef CBAUDEX
|
|
|
|
/* Starting with kernel 1.1.65, there is direct support for
|
|
|
|
higher baud rates. The following code supports those
|
|
|
|
changes. The conditional aspect allows this driver to be
|
|
|
|
used for earlier as well as later kernel versions. (The
|
|
|
|
mapping is slightly different from serial.c because there
|
|
|
|
is still the possibility of supporting 75 kbit/sec with
|
|
|
|
the Cyclades board.)
|
|
|
|
*/
|
|
|
|
if (i & CBAUDEX) {
|
|
|
|
if (i == B57600)
|
|
|
|
i = 16;
|
|
|
|
else if(i == B115200)
|
|
|
|
i = 18;
|
|
|
|
#ifdef B78600
|
|
|
|
else if(i == B78600)
|
|
|
|
i = 17;
|
|
|
|
#endif
|
|
|
|
else
|
|
|
|
info->tty->termios->c_cflag &= ~CBAUDEX;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (i == 15) {
|
|
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
|
|
|
i += 1;
|
|
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
|
|
|
i += 3;
|
|
|
|
}
|
|
|
|
/* Don't ever change the speed of the console port. It will
|
|
|
|
* run at the speed specified in bootinfo, or at 19.2K */
|
|
|
|
/* Actually, it should run at whatever speed 166Bug was using */
|
|
|
|
/* Note info->timeout isn't used at present */
|
|
|
|
if (info != serial_console_info) {
|
|
|
|
info->tbpr = baud_bpr[i]; /* Tx BPR */
|
|
|
|
info->tco = baud_co[i]; /* Tx CO */
|
|
|
|
info->rbpr = baud_bpr[i]; /* Rx BPR */
|
|
|
|
info->rco = baud_co[i] >> 5; /* Rx CO */
|
|
|
|
if (baud_table[i] == 134) {
|
|
|
|
info->timeout = (info->xmit_fifo_size*HZ*30/269) + 2;
|
|
|
|
/* get it right for 134.5 baud */
|
|
|
|
} else if (baud_table[i]) {
|
|
|
|
info->timeout = (info->xmit_fifo_size*HZ*15/baud_table[i]) + 2;
|
|
|
|
/* this needs to be propagated into the card info */
|
|
|
|
} else {
|
|
|
|
info->timeout = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* By tradition (is it a standard?) a baud rate of zero
|
|
|
|
implies the line should be/has been closed. A bit
|
|
|
|
later in this routine such a test is performed. */
|
|
|
|
|
|
|
|
/* byte size and parity */
|
|
|
|
info->cor7 = 0;
|
|
|
|
info->cor6 = 0;
|
|
|
|
info->cor5 = 0;
|
|
|
|
info->cor4 = (info->default_threshold
|
|
|
|
? info->default_threshold
|
|
|
|
: baud_cor4[i]); /* receive threshold */
|
|
|
|
/* Following two lines added 101295, RGH. */
|
|
|
|
/* It is obviously wrong to access CyCORx, and not info->corx here,
|
|
|
|
* try and remember to fix it later! */
|
|
|
|
channel = info->line;
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
if (C_CLOCAL(info->tty)) {
|
|
|
|
if (base_addr[CyIER] & CyMdmCh)
|
|
|
|
base_addr[CyIER] &= ~CyMdmCh; /* without modem intr */
|
|
|
|
/* ignore 1->0 modem transitions */
|
|
|
|
if (base_addr[CyCOR4] & (CyDSR|CyCTS|CyDCD))
|
|
|
|
base_addr[CyCOR4] &= ~(CyDSR|CyCTS|CyDCD);
|
|
|
|
/* ignore 0->1 modem transitions */
|
|
|
|
if (base_addr[CyCOR5] & (CyDSR|CyCTS|CyDCD))
|
|
|
|
base_addr[CyCOR5] &= ~(CyDSR|CyCTS|CyDCD);
|
|
|
|
} else {
|
|
|
|
if ((base_addr[CyIER] & CyMdmCh) != CyMdmCh)
|
|
|
|
base_addr[CyIER] |= CyMdmCh; /* with modem intr */
|
|
|
|
/* act on 1->0 modem transitions */
|
|
|
|
if ((base_addr[CyCOR4] & (CyDSR|CyCTS|CyDCD)) != (CyDSR|CyCTS|CyDCD))
|
|
|
|
base_addr[CyCOR4] |= CyDSR|CyCTS|CyDCD;
|
|
|
|
/* act on 0->1 modem transitions */
|
|
|
|
if ((base_addr[CyCOR5] & (CyDSR|CyCTS|CyDCD)) != (CyDSR|CyCTS|CyDCD))
|
|
|
|
base_addr[CyCOR5] |= CyDSR|CyCTS|CyDCD;
|
|
|
|
}
|
|
|
|
info->cor3 = (cflag & CSTOPB) ? Cy_2_STOP : Cy_1_STOP;
|
|
|
|
info->cor2 = CyETC;
|
|
|
|
switch(cflag & CSIZE){
|
|
|
|
case CS5:
|
|
|
|
info->cor1 = Cy_5_BITS;
|
|
|
|
break;
|
|
|
|
case CS6:
|
|
|
|
info->cor1 = Cy_6_BITS;
|
|
|
|
break;
|
|
|
|
case CS7:
|
|
|
|
info->cor1 = Cy_7_BITS;
|
|
|
|
break;
|
|
|
|
case CS8:
|
|
|
|
info->cor1 = Cy_8_BITS;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (cflag & PARENB){
|
|
|
|
if (cflag & PARODD){
|
|
|
|
info->cor1 |= CyPARITY_O;
|
|
|
|
}else{
|
|
|
|
info->cor1 |= CyPARITY_E;
|
|
|
|
}
|
|
|
|
}else{
|
|
|
|
info->cor1 |= CyPARITY_NONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* CTS flow control flag */
|
|
|
|
#if 0
|
|
|
|
/* Don't complcate matters for now! RGH 141095 */
|
|
|
|
if (cflag & CRTSCTS){
|
|
|
|
info->flags |= ASYNC_CTS_FLOW;
|
|
|
|
info->cor2 |= CyCtsAE;
|
|
|
|
}else{
|
|
|
|
info->flags &= ~ASYNC_CTS_FLOW;
|
|
|
|
info->cor2 &= ~CyCtsAE;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
if (cflag & CLOCAL)
|
|
|
|
info->flags &= ~ASYNC_CHECK_CD;
|
|
|
|
else
|
|
|
|
info->flags |= ASYNC_CHECK_CD;
|
|
|
|
|
|
|
|
/***********************************************
|
|
|
|
The hardware option, CyRtsAO, presents RTS when
|
|
|
|
the chip has characters to send. Since most modems
|
|
|
|
use RTS as reverse (inbound) flow control, this
|
|
|
|
option is not used. If inbound flow control is
|
|
|
|
necessary, DTR can be programmed to provide the
|
|
|
|
appropriate signals for use with a non-standard
|
|
|
|
cable. Contact Marcio Saito for details.
|
|
|
|
***********************************************/
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
|
|
|
|
/* CyCMR set once only in mvme167_init_serial() */
|
|
|
|
if (base_addr[CyLICR] != channel << 2)
|
|
|
|
base_addr[CyLICR] = channel << 2;
|
|
|
|
if (base_addr[CyLIVR] != 0x5c)
|
|
|
|
base_addr[CyLIVR] = 0x5c;
|
|
|
|
|
|
|
|
/* tx and rx baud rate */
|
|
|
|
|
|
|
|
if (base_addr[CyCOR1] != info->cor1)
|
|
|
|
need_init_chan = 1;
|
|
|
|
if (base_addr[CyTCOR] != info->tco)
|
|
|
|
base_addr[CyTCOR] = info->tco;
|
|
|
|
if (base_addr[CyTBPR] != info->tbpr)
|
|
|
|
base_addr[CyTBPR] = info->tbpr;
|
|
|
|
if (base_addr[CyRCOR] != info->rco)
|
|
|
|
base_addr[CyRCOR] = info->rco;
|
|
|
|
if (base_addr[CyRBPR] != info->rbpr)
|
|
|
|
base_addr[CyRBPR] = info->rbpr;
|
|
|
|
|
|
|
|
/* set line characteristics according configuration */
|
|
|
|
|
|
|
|
if (base_addr[CySCHR1] != START_CHAR(info->tty))
|
|
|
|
base_addr[CySCHR1] = START_CHAR(info->tty);
|
|
|
|
if (base_addr[CySCHR2] != STOP_CHAR(info->tty))
|
|
|
|
base_addr[CySCHR2] = STOP_CHAR(info->tty);
|
|
|
|
if (base_addr[CySCRL] != START_CHAR(info->tty))
|
|
|
|
base_addr[CySCRL] = START_CHAR(info->tty);
|
|
|
|
if (base_addr[CySCRH] != START_CHAR(info->tty))
|
|
|
|
base_addr[CySCRH] = START_CHAR(info->tty);
|
|
|
|
if (base_addr[CyCOR1] != info->cor1)
|
|
|
|
base_addr[CyCOR1] = info->cor1;
|
|
|
|
if (base_addr[CyCOR2] != info->cor2)
|
|
|
|
base_addr[CyCOR2] = info->cor2;
|
|
|
|
if (base_addr[CyCOR3] != info->cor3)
|
|
|
|
base_addr[CyCOR3] = info->cor3;
|
|
|
|
if (base_addr[CyCOR4] != info->cor4)
|
|
|
|
base_addr[CyCOR4] = info->cor4;
|
|
|
|
if (base_addr[CyCOR5] != info->cor5)
|
|
|
|
base_addr[CyCOR5] = info->cor5;
|
|
|
|
if (base_addr[CyCOR6] != info->cor6)
|
|
|
|
base_addr[CyCOR6] = info->cor6;
|
|
|
|
if (base_addr[CyCOR7] != info->cor7)
|
|
|
|
base_addr[CyCOR7] = info->cor7;
|
|
|
|
|
|
|
|
if (need_init_chan)
|
|
|
|
write_cy_cmd(base_addr,CyINIT_CHAN);
|
|
|
|
|
|
|
|
base_addr[CyCAR] = (u_char)channel; /* !!! Is this needed? */
|
|
|
|
|
|
|
|
/* 2ms default rx timeout */
|
|
|
|
ti = info->default_timeout ? info->default_timeout : 0x02;
|
|
|
|
if (base_addr[CyRTPRL] != ti)
|
|
|
|
base_addr[CyRTPRL] = ti;
|
|
|
|
if (base_addr[CyRTPRH] != 0)
|
|
|
|
base_addr[CyRTPRH] = 0;
|
|
|
|
|
|
|
|
/* Set up RTS here also ????? RGH 141095 */
|
|
|
|
if(i == 0){ /* baud rate is zero, turn off line */
|
|
|
|
if ((base_addr[CyMSVR2] & CyDTR) == CyDTR)
|
|
|
|
base_addr[CyMSVR2] = 0;
|
|
|
|
#ifdef SERIAL_DEBUG_DTR
|
|
|
|
printk("cyc: %d: dropping DTR\n", __LINE__);
|
|
|
|
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
|
|
|
|
#endif
|
|
|
|
}else{
|
|
|
|
if ((base_addr[CyMSVR2] & CyDTR) != CyDTR)
|
|
|
|
base_addr[CyMSVR2] = CyDTR;
|
|
|
|
#ifdef SERIAL_DEBUG_DTR
|
|
|
|
printk("cyc: %d: raising DTR\n", __LINE__);
|
|
|
|
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
if (info->tty){
|
|
|
|
clear_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
} /* config_setup */
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
cy_put_char(struct tty_struct *tty, unsigned char ch)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_IO
|
|
|
|
printk("cy_put_char %s(0x%02x)\n", tty->name, ch);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_put_char"))
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (!tty || !info->xmit_buf)
|
|
|
|
return;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (info->xmit_cnt >= PAGE_SIZE - 1) {
|
|
|
|
local_irq_restore(flags);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
info->xmit_buf[info->xmit_head++] = ch;
|
|
|
|
info->xmit_head &= PAGE_SIZE - 1;
|
|
|
|
info->xmit_cnt++;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
} /* cy_put_char */
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
cy_flush_chars(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
unsigned long flags;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_IO
|
|
|
|
printk("cy_flush_chars %s\n", tty->name); /* */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_flush_chars"))
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (info->xmit_cnt <= 0 || tty->stopped
|
|
|
|
|| tty->hw_stopped || !info->xmit_buf)
|
|
|
|
return;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = channel;
|
|
|
|
base_addr[CyIER] |= CyTxMpty;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
} /* cy_flush_chars */
|
|
|
|
|
|
|
|
|
|
|
|
/* This routine gets called when tty_write has put something into
|
|
|
|
the write_queue. If the port is not already transmitting stuff,
|
|
|
|
start it off by enabling interrupts. The interrupt service
|
|
|
|
routine will then ensure that the characters are sent. If the
|
|
|
|
port is already active, there is no need to kick it.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
cy_write(struct tty_struct * tty,
|
|
|
|
const unsigned char *buf, int count)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
unsigned long flags;
|
|
|
|
int c, total = 0;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_IO
|
|
|
|
printk("cy_write %s\n", tty->name); /* */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_write")){
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!tty || !info->xmit_buf || !tmp_buf){
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
local_irq_save(flags);
|
|
|
|
c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
|
|
|
|
SERIAL_XMIT_SIZE - info->xmit_head));
|
|
|
|
if (c <= 0) {
|
|
|
|
local_irq_restore(flags);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(info->xmit_buf + info->xmit_head, buf, c);
|
|
|
|
info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
|
|
|
|
info->xmit_cnt += c;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
buf += c;
|
|
|
|
count -= c;
|
|
|
|
total += c;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (info->xmit_cnt
|
|
|
|
&& !tty->stopped
|
|
|
|
&& !tty->hw_stopped ) {
|
|
|
|
start_xmit(info);
|
|
|
|
}
|
|
|
|
return total;
|
|
|
|
} /* cy_write */
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
cy_write_room(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_IO
|
|
|
|
printk("cy_write_room %s\n", tty->name); /* */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_write_room"))
|
|
|
|
return 0;
|
|
|
|
ret = PAGE_SIZE - info->xmit_cnt - 1;
|
|
|
|
if (ret < 0)
|
|
|
|
ret = 0;
|
|
|
|
return ret;
|
|
|
|
} /* cy_write_room */
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
cy_chars_in_buffer(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_IO
|
|
|
|
printk("cy_chars_in_buffer %s %d\n", tty->name, info->xmit_cnt); /* */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_chars_in_buffer"))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return info->xmit_cnt;
|
|
|
|
} /* cy_chars_in_buffer */
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
cy_flush_buffer(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_IO
|
|
|
|
printk("cy_flush_buffer %s\n", tty->name); /* */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_flush_buffer"))
|
|
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
tty_wakeup(tty);
|
|
|
|
} /* cy_flush_buffer */
|
|
|
|
|
|
|
|
|
|
|
|
/* This routine is called by the upper-layer tty layer to signal
|
|
|
|
that incoming characters should be throttled or that the
|
|
|
|
throttle should be released.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
cy_throttle(struct tty_struct * tty)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
unsigned long flags;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
|
|
char buf[64];
|
|
|
|
|
|
|
|
printk("throttle %s: %d....\n", tty_name(tty, buf),
|
|
|
|
tty->ldisc.chars_in_buffer(tty));
|
|
|
|
printk("cy_throttle %s\n", tty->name);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_nthrottle")){
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (I_IXOFF(tty)) {
|
|
|
|
info->x_char = STOP_CHAR(tty);
|
|
|
|
/* Should use the "Send Special Character" feature!!! */
|
|
|
|
}
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
base_addr[CyMSVR1] = 0;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
return;
|
|
|
|
} /* cy_throttle */
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
cy_unthrottle(struct tty_struct * tty)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
unsigned long flags;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
|
|
char buf[64];
|
|
|
|
|
|
|
|
printk("throttle %s: %d....\n", tty_name(tty, buf),
|
|
|
|
tty->ldisc.chars_in_buffer(tty));
|
|
|
|
printk("cy_unthrottle %s\n", tty->name);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_nthrottle")){
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (I_IXOFF(tty)) {
|
|
|
|
info->x_char = START_CHAR(tty);
|
|
|
|
/* Should use the "Send Special Character" feature!!! */
|
|
|
|
}
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
base_addr[CyMSVR1] = CyRTS;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
return;
|
|
|
|
} /* cy_unthrottle */
|
|
|
|
|
|
|
|
static int
|
|
|
|
get_serial_info(struct cyclades_port * info,
|
|
|
|
struct serial_struct * retinfo)
|
|
|
|
{
|
|
|
|
struct serial_struct tmp;
|
|
|
|
|
|
|
|
/* CP('g'); */
|
|
|
|
if (!retinfo)
|
|
|
|
return -EFAULT;
|
|
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
|
|
tmp.type = info->type;
|
|
|
|
tmp.line = info->line;
|
|
|
|
tmp.port = info->line;
|
|
|
|
tmp.irq = 0;
|
|
|
|
tmp.flags = info->flags;
|
|
|
|
tmp.baud_base = 0; /*!!!*/
|
|
|
|
tmp.close_delay = info->close_delay;
|
|
|
|
tmp.custom_divisor = 0; /*!!!*/
|
|
|
|
tmp.hub6 = 0; /*!!!*/
|
|
|
|
return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
|
|
|
|
} /* get_serial_info */
|
|
|
|
|
|
|
|
static int
|
|
|
|
set_serial_info(struct cyclades_port * info,
|
|
|
|
struct serial_struct * new_info)
|
|
|
|
{
|
|
|
|
struct serial_struct new_serial;
|
|
|
|
struct cyclades_port old_info;
|
|
|
|
|
|
|
|
/* CP('s'); */
|
|
|
|
if (!new_info)
|
|
|
|
return -EFAULT;
|
|
|
|
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
|
|
|
|
return -EFAULT;
|
|
|
|
old_info = *info;
|
|
|
|
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
|
|
if ((new_serial.close_delay != info->close_delay) ||
|
|
|
|
((new_serial.flags & ASYNC_FLAGS & ~ASYNC_USR_MASK) !=
|
|
|
|
(info->flags & ASYNC_FLAGS & ~ASYNC_USR_MASK)))
|
|
|
|
return -EPERM;
|
|
|
|
info->flags = ((info->flags & ~ASYNC_USR_MASK) |
|
|
|
|
(new_serial.flags & ASYNC_USR_MASK));
|
|
|
|
goto check_and_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* OK, past this point, all the error checking has been done.
|
|
|
|
* At this point, we start making changes.....
|
|
|
|
*/
|
|
|
|
|
|
|
|
info->flags = ((info->flags & ~ASYNC_FLAGS) |
|
|
|
|
(new_serial.flags & ASYNC_FLAGS));
|
|
|
|
info->close_delay = new_serial.close_delay;
|
|
|
|
|
|
|
|
|
|
|
|
check_and_exit:
|
|
|
|
if (info->flags & ASYNC_INITIALIZED){
|
|
|
|
config_setup(info);
|
|
|
|
return 0;
|
|
|
|
}else{
|
|
|
|
return startup(info);
|
|
|
|
}
|
|
|
|
} /* set_serial_info */
|
|
|
|
|
|
|
|
static int
|
|
|
|
cy_tiocmget(struct tty_struct *tty, struct file *file)
|
|
|
|
{
|
|
|
|
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
int channel;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
unsigned long flags;
|
|
|
|
unsigned char status;
|
|
|
|
unsigned int result;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
status = base_addr[CyMSVR1] | base_addr[CyMSVR2];
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
return ((status & CyRTS) ? TIOCM_RTS : 0)
|
|
|
|
| ((status & CyDTR) ? TIOCM_DTR : 0)
|
|
|
|
| ((status & CyDCD) ? TIOCM_CAR : 0)
|
|
|
|
| ((status & CyDSR) ? TIOCM_DSR : 0)
|
|
|
|
| ((status & CyCTS) ? TIOCM_CTS : 0);
|
|
|
|
} /* cy_tiocmget */
|
|
|
|
|
|
|
|
static int
|
|
|
|
cy_tiocmset(struct tty_struct *tty, struct file *file,
|
|
|
|
unsigned int set, unsigned int clear)
|
|
|
|
{
|
|
|
|
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
int channel;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
unsigned long flags;
|
|
|
|
unsigned int arg;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
if (set & TIOCM_RTS){
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
base_addr[CyMSVR1] = CyRTS;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
if (set & TIOCM_DTR){
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
/* CP('S');CP('2'); */
|
|
|
|
base_addr[CyMSVR2] = CyDTR;
|
|
|
|
#ifdef SERIAL_DEBUG_DTR
|
|
|
|
printk("cyc: %d: raising DTR\n", __LINE__);
|
|
|
|
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
|
|
|
|
#endif
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (clear & TIOCM_RTS){
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
base_addr[CyMSVR1] = 0;
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
if (clear & TIOCM_DTR){
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
/* CP('C');CP('2'); */
|
|
|
|
base_addr[CyMSVR2] = 0;
|
|
|
|
#ifdef SERIAL_DEBUG_DTR
|
|
|
|
printk("cyc: %d: dropping DTR\n", __LINE__);
|
|
|
|
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
|
|
|
|
#endif
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
} /* set_modem_info */
|
|
|
|
|
|
|
|
static void
|
|
|
|
send_break( struct cyclades_port * info, int duration)
|
|
|
|
{ /* Let the transmit ISR take care of this (since it
|
|
|
|
requires stuffing characters into the output stream).
|
|
|
|
*/
|
|
|
|
info->x_break = duration;
|
|
|
|
if (!info->xmit_cnt ) {
|
|
|
|
start_xmit(info);
|
|
|
|
}
|
|
|
|
} /* send_break */
|
|
|
|
|
|
|
|
static int
|
|
|
|
get_mon_info(struct cyclades_port * info, struct cyclades_monitor * mon)
|
|
|
|
{
|
|
|
|
|
|
|
|
if (copy_to_user(mon, &info->mon, sizeof(struct cyclades_monitor)))
|
|
|
|
return -EFAULT;
|
|
|
|
info->mon.int_count = 0;
|
|
|
|
info->mon.char_count = 0;
|
|
|
|
info->mon.char_max = 0;
|
|
|
|
info->mon.char_last = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
set_threshold(struct cyclades_port * info, unsigned long *arg)
|
|
|
|
{
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
unsigned long value;
|
|
|
|
int channel;
|
|
|
|
|
|
|
|
if (get_user(value, arg))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
info->cor4 &= ~CyREC_FIFO;
|
|
|
|
info->cor4 |= value & CyREC_FIFO;
|
|
|
|
base_addr[CyCOR4] = info->cor4;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
get_threshold(struct cyclades_port * info, unsigned long *value)
|
|
|
|
{
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
unsigned long tmp;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
tmp = base_addr[CyCOR4] & CyREC_FIFO;
|
|
|
|
return put_user(tmp,value);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
set_default_threshold(struct cyclades_port * info, unsigned long *arg)
|
|
|
|
{
|
|
|
|
unsigned long value;
|
|
|
|
|
|
|
|
if (get_user(value, arg))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
info->default_threshold = value & 0x0f;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
get_default_threshold(struct cyclades_port * info, unsigned long *value)
|
|
|
|
{
|
|
|
|
return put_user(info->default_threshold,value);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
set_timeout(struct cyclades_port * info, unsigned long *arg)
|
|
|
|
{
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
unsigned long value;
|
|
|
|
|
|
|
|
if (get_user(value, arg))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
base_addr[CyRTPRL] = value & 0xff;
|
|
|
|
base_addr[CyRTPRH] = (value >> 8) & 0xff;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
get_timeout(struct cyclades_port * info, unsigned long *value)
|
|
|
|
{
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
unsigned long tmp;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
tmp = base_addr[CyRTPRL];
|
|
|
|
return put_user(tmp,value);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
set_default_timeout(struct cyclades_port * info, unsigned long value)
|
|
|
|
{
|
|
|
|
info->default_timeout = value & 0xff;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
get_default_timeout(struct cyclades_port * info, unsigned long *value)
|
|
|
|
{
|
|
|
|
return put_user(info->default_timeout,value);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
cy_ioctl(struct tty_struct *tty, struct file * file,
|
|
|
|
unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
unsigned long val;
|
|
|
|
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
int ret_val = 0;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OTHER
|
|
|
|
printk("cy_ioctl %s, cmd = %x arg = %lx\n", tty->name, cmd, arg); /* */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case CYGETMON:
|
|
|
|
ret_val = get_mon_info(info, (struct cyclades_monitor *)arg);
|
|
|
|
break;
|
|
|
|
case CYGETTHRESH:
|
|
|
|
ret_val = get_threshold(info, (unsigned long *)arg);
|
|
|
|
break;
|
|
|
|
case CYSETTHRESH:
|
|
|
|
ret_val = set_threshold(info, (unsigned long *)arg);
|
|
|
|
break;
|
|
|
|
case CYGETDEFTHRESH:
|
|
|
|
ret_val = get_default_threshold(info, (unsigned long *)arg);
|
|
|
|
break;
|
|
|
|
case CYSETDEFTHRESH:
|
|
|
|
ret_val = set_default_threshold(info, (unsigned long *)arg);
|
|
|
|
break;
|
|
|
|
case CYGETTIMEOUT:
|
|
|
|
ret_val = get_timeout(info, (unsigned long *)arg);
|
|
|
|
break;
|
|
|
|
case CYSETTIMEOUT:
|
|
|
|
ret_val = set_timeout(info, (unsigned long *)arg);
|
|
|
|
break;
|
|
|
|
case CYGETDEFTIMEOUT:
|
|
|
|
ret_val = get_default_timeout(info, (unsigned long *)arg);
|
|
|
|
break;
|
|
|
|
case CYSETDEFTIMEOUT:
|
|
|
|
ret_val = set_default_timeout(info, (unsigned long)arg);
|
|
|
|
break;
|
|
|
|
case TCSBRK: /* SVID version: non-zero arg --> no break */
|
|
|
|
ret_val = tty_check_change(tty);
|
|
|
|
if (ret_val)
|
|
|
|
break;
|
|
|
|
tty_wait_until_sent(tty,0);
|
|
|
|
if (!arg)
|
|
|
|
send_break(info, HZ/4); /* 1/4 second */
|
|
|
|
break;
|
|
|
|
case TCSBRKP: /* support for POSIX tcsendbreak() */
|
|
|
|
ret_val = tty_check_change(tty);
|
|
|
|
if (ret_val)
|
|
|
|
break;
|
|
|
|
tty_wait_until_sent(tty,0);
|
|
|
|
send_break(info, arg ? arg*(HZ/10) : HZ/4);
|
|
|
|
break;
|
|
|
|
|
|
|
|
/* The following commands are incompletely implemented!!! */
|
|
|
|
case TIOCGSOFTCAR:
|
|
|
|
ret_val = put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long *) arg);
|
|
|
|
break;
|
|
|
|
case TIOCSSOFTCAR:
|
|
|
|
ret_val = get_user(val, (unsigned long *) arg);
|
|
|
|
if (ret_val)
|
|
|
|
break;
|
|
|
|
tty->termios->c_cflag =
|
|
|
|
((tty->termios->c_cflag & ~CLOCAL) | (val ? CLOCAL : 0));
|
|
|
|
break;
|
|
|
|
case TIOCGSERIAL:
|
|
|
|
ret_val = get_serial_info(info, (struct serial_struct *) arg);
|
|
|
|
break;
|
|
|
|
case TIOCSSERIAL:
|
|
|
|
ret_val = set_serial_info(info,
|
|
|
|
(struct serial_struct *) arg);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ret_val = -ENOIOCTLCMD;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OTHER
|
|
|
|
printk("cy_ioctl done\n");
|
|
|
|
#endif
|
|
|
|
|
|
|
|
return ret_val;
|
|
|
|
} /* cy_ioctl */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
cy_set_termios(struct tty_struct *tty, struct termios * old_termios)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OTHER
|
|
|
|
printk("cy_set_termios %s\n", tty->name);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (tty->termios->c_cflag == old_termios->c_cflag)
|
|
|
|
return;
|
|
|
|
config_setup(info);
|
|
|
|
|
|
|
|
if ((old_termios->c_cflag & CRTSCTS) &&
|
|
|
|
!(tty->termios->c_cflag & CRTSCTS)) {
|
|
|
|
tty->stopped = 0;
|
|
|
|
cy_start(tty);
|
|
|
|
}
|
|
|
|
#ifdef tytso_patch_94Nov25_1726
|
|
|
|
if (!(old_termios->c_cflag & CLOCAL) &&
|
|
|
|
(tty->termios->c_cflag & CLOCAL))
|
|
|
|
wake_up_interruptible(&info->open_wait);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
return;
|
|
|
|
} /* cy_set_termios */
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
cy_close(struct tty_struct * tty, struct file * filp)
|
|
|
|
{
|
|
|
|
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
|
|
|
|
/* CP('C'); */
|
|
|
|
#ifdef SERIAL_DEBUG_OTHER
|
|
|
|
printk("cy_close %s\n", tty->name);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (!info
|
|
|
|
|| serial_paranoia_check(info, tty->name, "cy_close")){
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("cy_close %s, count = %d\n", tty->name, info->count);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if ((tty->count == 1) && (info->count != 1)) {
|
|
|
|
/*
|
|
|
|
* Uh, oh. tty->count is 1, which means that the tty
|
|
|
|
* structure will be freed. Info->count should always
|
|
|
|
* be one in these conditions. If it's greater than
|
|
|
|
* one, we've got real problems, since it means the
|
|
|
|
* serial port won't be shutdown.
|
|
|
|
*/
|
|
|
|
printk("cy_close: bad serial port count; tty->count is 1, "
|
|
|
|
"info->count is %d\n", info->count);
|
|
|
|
info->count = 1;
|
|
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_COUNT
|
|
|
|
printk("cyc: %d: decrementing count to %d\n", __LINE__, info->count - 1);
|
|
|
|
#endif
|
|
|
|
if (--info->count < 0) {
|
|
|
|
printk("cy_close: bad serial port count for ttys%d: %d\n",
|
|
|
|
info->line, info->count);
|
|
|
|
#ifdef SERIAL_DEBUG_COUNT
|
|
|
|
printk("cyc: %d: setting count to 0\n", __LINE__);
|
|
|
|
#endif
|
|
|
|
info->count = 0;
|
|
|
|
}
|
|
|
|
if (info->count)
|
|
|
|
return;
|
|
|
|
info->flags |= ASYNC_CLOSING;
|
|
|
|
if (info->flags & ASYNC_INITIALIZED)
|
|
|
|
tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
|
|
|
|
shutdown(info);
|
|
|
|
if (tty->driver->flush_buffer)
|
|
|
|
tty->driver->flush_buffer(tty);
|
|
|
|
tty_ldisc_flush(tty);
|
|
|
|
info->event = 0;
|
|
|
|
info->tty = 0;
|
|
|
|
if (info->blocked_open) {
|
|
|
|
if (info->close_delay) {
|
|
|
|
msleep_interruptible(jiffies_to_msecs(info->close_delay));
|
|
|
|
}
|
|
|
|
wake_up_interruptible(&info->open_wait);
|
|
|
|
}
|
|
|
|
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
|
|
|
|
wake_up_interruptible(&info->close_wait);
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OTHER
|
|
|
|
printk("cy_close done\n");
|
|
|
|
#endif
|
|
|
|
|
|
|
|
return;
|
|
|
|
} /* cy_close */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* cy_hangup() --- called by tty_hangup() when a hangup is signaled.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
cy_hangup(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OTHER
|
|
|
|
printk("cy_hangup %s\n", tty->name); /* */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_hangup"))
|
|
|
|
return;
|
|
|
|
|
|
|
|
shutdown(info);
|
|
|
|
#if 0
|
|
|
|
info->event = 0;
|
|
|
|
info->count = 0;
|
|
|
|
#ifdef SERIAL_DEBUG_COUNT
|
|
|
|
printk("cyc: %d: setting count to 0\n", __LINE__);
|
|
|
|
#endif
|
|
|
|
info->tty = 0;
|
|
|
|
#endif
|
|
|
|
info->flags &= ~ASYNC_NORMAL_ACTIVE;
|
|
|
|
wake_up_interruptible(&info->open_wait);
|
|
|
|
} /* cy_hangup */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
* cy_open() and friends
|
|
|
|
* ------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int
|
|
|
|
block_til_ready(struct tty_struct *tty, struct file * filp,
|
|
|
|
struct cyclades_port *info)
|
|
|
|
{
|
|
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
unsigned long flags;
|
|
|
|
int channel;
|
|
|
|
int retval;
|
|
|
|
volatile u_char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the device is in the middle of being closed, then block
|
|
|
|
* until it's done, and then try again.
|
|
|
|
*/
|
|
|
|
if (info->flags & ASYNC_CLOSING) {
|
|
|
|
interruptible_sleep_on(&info->close_wait);
|
|
|
|
if (info->flags & ASYNC_HUP_NOTIFY){
|
|
|
|
return -EAGAIN;
|
|
|
|
}else{
|
|
|
|
return -ERESTARTSYS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If non-blocking mode is set, then make the check up front
|
|
|
|
* and then exit.
|
|
|
|
*/
|
|
|
|
if (filp->f_flags & O_NONBLOCK) {
|
|
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Block waiting for the carrier detect and the line to become
|
|
|
|
* free (i.e., not in use by the callout). While we are in
|
|
|
|
* this loop, info->count is dropped by one, so that
|
|
|
|
* cy_close() knows when to free things. We restore it upon
|
|
|
|
* exit, either normal or abnormal.
|
|
|
|
*/
|
|
|
|
retval = 0;
|
|
|
|
add_wait_queue(&info->open_wait, &wait);
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("block_til_ready before block: %s, count = %d\n",
|
|
|
|
tty->name, info->count);/**/
|
|
|
|
#endif
|
|
|
|
info->count--;
|
|
|
|
#ifdef SERIAL_DEBUG_COUNT
|
|
|
|
printk("cyc: %d: decrementing count to %d\n", __LINE__, info->count);
|
|
|
|
#endif
|
|
|
|
info->blocked_open++;
|
|
|
|
|
|
|
|
channel = info->line;
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
base_addr[CyMSVR1] = CyRTS;
|
|
|
|
/* CP('S');CP('4'); */
|
|
|
|
base_addr[CyMSVR2] = CyDTR;
|
|
|
|
#ifdef SERIAL_DEBUG_DTR
|
|
|
|
printk("cyc: %d: raising DTR\n", __LINE__);
|
|
|
|
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
|
|
|
|
#endif
|
|
|
|
local_irq_restore(flags);
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
if (tty_hung_up_p(filp)
|
|
|
|
|| !(info->flags & ASYNC_INITIALIZED) ){
|
|
|
|
if (info->flags & ASYNC_HUP_NOTIFY) {
|
|
|
|
retval = -EAGAIN;
|
|
|
|
}else{
|
|
|
|
retval = -ERESTARTSYS;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
local_irq_save(flags);
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
/* CP('L');CP1(1 && C_CLOCAL(tty)); CP1(1 && (base_addr[CyMSVR1] & CyDCD) ); */
|
|
|
|
if (!(info->flags & ASYNC_CLOSING)
|
|
|
|
&& (C_CLOCAL(tty)
|
|
|
|
|| (base_addr[CyMSVR1] & CyDCD))) {
|
|
|
|
local_irq_restore(flags);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
|
|
if (signal_pending(current)) {
|
|
|
|
retval = -ERESTARTSYS;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("block_til_ready blocking: %s, count = %d\n",
|
|
|
|
tty->name, info->count);/**/
|
|
|
|
#endif
|
|
|
|
schedule();
|
|
|
|
}
|
|
|
|
current->state = TASK_RUNNING;
|
|
|
|
remove_wait_queue(&info->open_wait, &wait);
|
|
|
|
if (!tty_hung_up_p(filp)){
|
|
|
|
info->count++;
|
|
|
|
#ifdef SERIAL_DEBUG_COUNT
|
|
|
|
printk("cyc: %d: incrementing count to %d\n", __LINE__, info->count);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
info->blocked_open--;
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("block_til_ready after blocking: %s, count = %d\n",
|
|
|
|
tty->name, info->count);/**/
|
|
|
|
#endif
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
|
|
|
return 0;
|
|
|
|
} /* block_til_ready */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine is called whenever a serial port is opened. It
|
|
|
|
* performs the serial-specific initialization for the tty structure.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
cy_open(struct tty_struct *tty, struct file * filp)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info;
|
|
|
|
int retval, line;
|
|
|
|
|
|
|
|
/* CP('O'); */
|
|
|
|
line = tty->index;
|
|
|
|
if ((line < 0) || (NR_PORTS <= line)){
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
info = &cy_port[line];
|
|
|
|
if (info->line < 0){
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OTHER
|
|
|
|
printk("cy_open %s\n", tty->name); /* */
|
|
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "cy_open")){
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("cy_open %s, count = %d\n", tty->name, info->count);/**/
|
|
|
|
#endif
|
|
|
|
info->count++;
|
|
|
|
#ifdef SERIAL_DEBUG_COUNT
|
|
|
|
printk("cyc: %d: incrementing count to %d\n", __LINE__, info->count);
|
|
|
|
#endif
|
|
|
|
tty->driver_data = info;
|
|
|
|
info->tty = tty;
|
|
|
|
|
|
|
|
if (!tmp_buf) {
|
|
|
|
tmp_buf = (unsigned char *) get_zeroed_page(GFP_KERNEL);
|
|
|
|
if (!tmp_buf){
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Start up serial port
|
|
|
|
*/
|
|
|
|
retval = startup(info);
|
|
|
|
if (retval){
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
retval = block_til_ready(tty, filp, info);
|
|
|
|
if (retval) {
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("cy_open returning after block_til_ready with %d\n",
|
|
|
|
retval);
|
|
|
|
#endif
|
|
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
|
|
printk("cy_open done\n");/**/
|
|
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
} /* cy_open */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ---------------------------------------------------------------------
|
|
|
|
* serial167_init() and friends
|
|
|
|
*
|
|
|
|
* serial167_init() is called at boot-time to initialize the serial driver.
|
|
|
|
* ---------------------------------------------------------------------
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This routine prints out the appropriate serial driver version
|
|
|
|
* number, and identifies which options were configured into this
|
|
|
|
* driver.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
show_version(void)
|
|
|
|
{
|
|
|
|
printk("MVME166/167 cd2401 driver\n");
|
|
|
|
} /* show_version */
|
|
|
|
|
|
|
|
/* initialize chips on card -- return number of valid
|
|
|
|
chips (which is number of ports/4) */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This initialises the hardware to a reasonable state. It should
|
|
|
|
* probe the chip first so as to copy 166-Bug setup as a default for
|
|
|
|
* port 0. It initialises CMR to CyASYNC; that is never done again, so
|
|
|
|
* as to limit the number of CyINIT_CHAN commands in normal running.
|
|
|
|
*
|
|
|
|
* ... I wonder what I should do if this fails ...
|
|
|
|
*/
|
|
|
|
|
|
|
|
void
|
|
|
|
mvme167_serial_console_setup(int cflag)
|
|
|
|
{
|
|
|
|
volatile unsigned char* base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int ch;
|
|
|
|
u_char spd;
|
|
|
|
u_char rcor, rbpr, badspeed = 0;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* First probe channel zero of the chip, to see what speed has
|
|
|
|
* been selected.
|
|
|
|
*/
|
|
|
|
|
|
|
|
base_addr[CyCAR] = 0;
|
|
|
|
|
|
|
|
rcor = base_addr[CyRCOR] << 5;
|
|
|
|
rbpr = base_addr[CyRBPR];
|
|
|
|
|
|
|
|
for (spd = 0; spd < sizeof(baud_bpr); spd++)
|
|
|
|
if (rbpr == baud_bpr[spd] && rcor == baud_co[spd])
|
|
|
|
break;
|
|
|
|
if (spd >= sizeof(baud_bpr)) {
|
|
|
|
spd = 14; /* 19200 */
|
|
|
|
badspeed = 1; /* Failed to identify speed */
|
|
|
|
}
|
|
|
|
initial_console_speed = spd;
|
|
|
|
|
|
|
|
/* OK, we have chosen a speed, now reset and reinitialise */
|
|
|
|
|
|
|
|
my_udelay(20000L); /* Allow time for any active o/p to complete */
|
|
|
|
if(base_addr[CyCCR] != 0x00){
|
|
|
|
local_irq_restore(flags);
|
|
|
|
/* printk(" chip is never idle (CCR != 0)\n"); */
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
base_addr[CyCCR] = CyCHIP_RESET; /* Reset the chip */
|
|
|
|
my_udelay(1000L);
|
|
|
|
|
|
|
|
if(base_addr[CyGFRCR] == 0x00){
|
|
|
|
local_irq_restore(flags);
|
|
|
|
/* printk(" chip is not responding (GFRCR stayed 0)\n"); */
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* System clock is 20Mhz, divided by 2048, so divide by 10 for a 1.0ms
|
|
|
|
* tick
|
|
|
|
*/
|
|
|
|
|
|
|
|
base_addr[CyTPR] = 10;
|
|
|
|
|
|
|
|
base_addr[CyPILR1] = 0x01; /* Interrupt level for modem change */
|
|
|
|
base_addr[CyPILR2] = 0x02; /* Interrupt level for tx ints */
|
|
|
|
base_addr[CyPILR3] = 0x03; /* Interrupt level for rx ints */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Attempt to set up all channels to something reasonable, and
|
|
|
|
* bang out a INIT_CHAN command. We should then be able to limit
|
|
|
|
* the ammount of fiddling we have to do in normal running.
|
|
|
|
*/
|
|
|
|
|
|
|
|
for (ch = 3; ch >= 0 ; ch--) {
|
|
|
|
base_addr[CyCAR] = (u_char)ch;
|
|
|
|
base_addr[CyIER] = 0;
|
|
|
|
base_addr[CyCMR] = CyASYNC;
|
|
|
|
base_addr[CyLICR] = (u_char)ch << 2;
|
|
|
|
base_addr[CyLIVR] = 0x5c;
|
|
|
|
base_addr[CyTCOR] = baud_co[spd];
|
|
|
|
base_addr[CyTBPR] = baud_bpr[spd];
|
|
|
|
base_addr[CyRCOR] = baud_co[spd] >> 5;
|
|
|
|
base_addr[CyRBPR] = baud_bpr[spd];
|
|
|
|
base_addr[CySCHR1] = 'Q' & 0x1f;
|
|
|
|
base_addr[CySCHR2] = 'X' & 0x1f;
|
|
|
|
base_addr[CySCRL] = 0;
|
|
|
|
base_addr[CySCRH] = 0;
|
|
|
|
base_addr[CyCOR1] = Cy_8_BITS | CyPARITY_NONE;
|
|
|
|
base_addr[CyCOR2] = 0;
|
|
|
|
base_addr[CyCOR3] = Cy_1_STOP;
|
|
|
|
base_addr[CyCOR4] = baud_cor4[spd];
|
|
|
|
base_addr[CyCOR5] = 0;
|
|
|
|
base_addr[CyCOR6] = 0;
|
|
|
|
base_addr[CyCOR7] = 0;
|
|
|
|
base_addr[CyRTPRL] = 2;
|
|
|
|
base_addr[CyRTPRH] = 0;
|
|
|
|
base_addr[CyMSVR1] = 0;
|
|
|
|
base_addr[CyMSVR2] = 0;
|
|
|
|
write_cy_cmd(base_addr,CyINIT_CHAN|CyDIS_RCVR|CyDIS_XMTR);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now do specials for channel zero....
|
|
|
|
*/
|
|
|
|
|
|
|
|
base_addr[CyMSVR1] = CyRTS;
|
|
|
|
base_addr[CyMSVR2] = CyDTR;
|
|
|
|
base_addr[CyIER] = CyRxData;
|
|
|
|
write_cy_cmd(base_addr,CyENB_RCVR|CyENB_XMTR);
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
my_udelay(20000L); /* Let it all settle down */
|
|
|
|
|
|
|
|
printk("CD2401 initialised, chip is rev 0x%02x\n", base_addr[CyGFRCR]);
|
|
|
|
if (badspeed)
|
|
|
|
printk(" WARNING: Failed to identify line speed, rcor=%02x,rbpr=%02x\n",
|
|
|
|
rcor >> 5, rbpr);
|
|
|
|
} /* serial_console_init */
|
|
|
|
|
|
|
|
static struct tty_operations cy_ops = {
|
|
|
|
.open = cy_open,
|
|
|
|
.close = cy_close,
|
|
|
|
.write = cy_write,
|
|
|
|
.put_char = cy_put_char,
|
|
|
|
.flush_chars = cy_flush_chars,
|
|
|
|
.write_room = cy_write_room,
|
|
|
|
.chars_in_buffer = cy_chars_in_buffer,
|
|
|
|
.flush_buffer = cy_flush_buffer,
|
|
|
|
.ioctl = cy_ioctl,
|
|
|
|
.throttle = cy_throttle,
|
|
|
|
.unthrottle = cy_unthrottle,
|
|
|
|
.set_termios = cy_set_termios,
|
|
|
|
.stop = cy_stop,
|
|
|
|
.start = cy_start,
|
|
|
|
.hangup = cy_hangup,
|
|
|
|
.tiocmget = cy_tiocmget,
|
|
|
|
.tiocmset = cy_tiocmset,
|
|
|
|
};
|
|
|
|
/* The serial driver boot-time initialization code!
|
|
|
|
Hardware I/O ports are mapped to character special devices on a
|
|
|
|
first found, first allocated manner. That is, this code searches
|
|
|
|
for Cyclom cards in the system. As each is found, it is probed
|
|
|
|
to discover how many chips (and thus how many ports) are present.
|
|
|
|
These ports are mapped to the tty ports 64 and upward in monotonic
|
|
|
|
fashion. If an 8-port card is replaced with a 16-port card, the
|
|
|
|
port mapping on a following card will shift.
|
|
|
|
|
|
|
|
This approach is different from what is used in the other serial
|
|
|
|
device driver because the Cyclom is more properly a multiplexer,
|
|
|
|
not just an aggregation of serial ports on one card.
|
|
|
|
|
|
|
|
If there are more cards with more ports than have been statically
|
|
|
|
allocated above, a warning is printed and the extra ports are ignored.
|
|
|
|
*/
|
|
|
|
static int __init
|
|
|
|
serial167_init(void)
|
|
|
|
{
|
|
|
|
struct cyclades_port *info;
|
|
|
|
int ret = 0;
|
|
|
|
int good_ports = 0;
|
|
|
|
int port_num = 0;
|
|
|
|
int index;
|
|
|
|
int DefSpeed;
|
|
|
|
#ifdef notyet
|
|
|
|
struct sigaction sa;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (!(mvme16x_config &MVME16x_CONFIG_GOT_CD2401))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
cy_serial_driver = alloc_tty_driver(NR_PORTS);
|
|
|
|
if (!cy_serial_driver)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
scrn[1] = '\0';
|
|
|
|
#endif
|
|
|
|
|
|
|
|
show_version();
|
|
|
|
|
|
|
|
/* Has "console=0,9600n8" been used in bootinfo to change speed? */
|
|
|
|
if (serial_console_cflag)
|
|
|
|
DefSpeed = serial_console_cflag & 0017;
|
|
|
|
else {
|
|
|
|
DefSpeed = initial_console_speed;
|
|
|
|
serial_console_info = &cy_port[0];
|
|
|
|
serial_console_cflag = DefSpeed | CS8;
|
|
|
|
#if 0
|
|
|
|
serial_console = 64; /*callout_driver.minor_start*/
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Initialize the tty_driver structure */
|
|
|
|
|
|
|
|
cy_serial_driver->owner = THIS_MODULE;
|
|
|
|
cy_serial_driver->name = "ttyS";
|
|
|
|
cy_serial_driver->major = TTY_MAJOR;
|
|
|
|
cy_serial_driver->minor_start = 64;
|
|
|
|
cy_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
|
|
cy_serial_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
|
|
cy_serial_driver->init_termios = tty_std_termios;
|
|
|
|
cy_serial_driver->init_termios.c_cflag =
|
|
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
|
|
cy_serial_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
|
|
tty_set_operations(cy_serial_driver, &cy_ops);
|
|
|
|
|
|
|
|
ret = tty_register_driver(cy_serial_driver);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR "Couldn't register MVME166/7 serial driver\n");
|
|
|
|
put_tty_driver(cy_serial_driver);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
port_num = 0;
|
|
|
|
info = cy_port;
|
|
|
|
for (index = 0; index < 1; index++) {
|
|
|
|
|
|
|
|
good_ports = 4;
|
|
|
|
|
|
|
|
if(port_num < NR_PORTS){
|
|
|
|
while( good_ports-- && port_num < NR_PORTS){
|
|
|
|
/*** initialize port ***/
|
|
|
|
info->magic = CYCLADES_MAGIC;
|
|
|
|
info->type = PORT_CIRRUS;
|
|
|
|
info->card = index;
|
|
|
|
info->line = port_num;
|
|
|
|
info->flags = STD_COM_FLAGS;
|
|
|
|
info->tty = 0;
|
|
|
|
info->xmit_fifo_size = 12;
|
|
|
|
info->cor1 = CyPARITY_NONE|Cy_8_BITS;
|
|
|
|
info->cor2 = CyETC;
|
|
|
|
info->cor3 = Cy_1_STOP;
|
|
|
|
info->cor4 = 0x08; /* _very_ small receive threshold */
|
|
|
|
info->cor5 = 0;
|
|
|
|
info->cor6 = 0;
|
|
|
|
info->cor7 = 0;
|
|
|
|
info->tbpr = baud_bpr[DefSpeed]; /* Tx BPR */
|
|
|
|
info->tco = baud_co[DefSpeed]; /* Tx CO */
|
|
|
|
info->rbpr = baud_bpr[DefSpeed]; /* Rx BPR */
|
|
|
|
info->rco = baud_co[DefSpeed] >> 5; /* Rx CO */
|
|
|
|
info->close_delay = 0;
|
|
|
|
info->x_char = 0;
|
|
|
|
info->event = 0;
|
|
|
|
info->count = 0;
|
|
|
|
#ifdef SERIAL_DEBUG_COUNT
|
|
|
|
printk("cyc: %d: setting count to 0\n", __LINE__);
|
|
|
|
#endif
|
|
|
|
info->blocked_open = 0;
|
|
|
|
info->default_threshold = 0;
|
|
|
|
info->default_timeout = 0;
|
|
|
|
INIT_WORK(&info->tqueue, do_softint, info);
|
|
|
|
init_waitqueue_head(&info->open_wait);
|
|
|
|
init_waitqueue_head(&info->close_wait);
|
|
|
|
/* info->session */
|
|
|
|
/* info->pgrp */
|
|
|
|
/*** !!!!!!!! this may expose new bugs !!!!!!!!! *********/
|
|
|
|
info->read_status_mask = CyTIMEOUT| CySPECHAR| CyBREAK
|
|
|
|
| CyPARITY| CyFRAME| CyOVERRUN;
|
|
|
|
/* info->timeout */
|
|
|
|
|
|
|
|
printk("ttyS%d ", info->line);
|
|
|
|
port_num++;info++;
|
|
|
|
if(!(port_num & 7)){
|
|
|
|
printk("\n ");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
printk("\n");
|
|
|
|
}
|
|
|
|
while( port_num < NR_PORTS){
|
|
|
|
info->line = -1;
|
|
|
|
port_num++;info++;
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_REMOTE_DEBUG
|
|
|
|
debug_setup();
|
|
|
|
#endif
|
|
|
|
ret = request_irq(MVME167_IRQ_SER_ERR, cd2401_rxerr_interrupt, 0,
|
|
|
|
"cd2401_errors", cd2401_rxerr_interrupt);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR "Could't get cd2401_errors IRQ");
|
|
|
|
goto cleanup_serial_driver;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = request_irq(MVME167_IRQ_SER_MODEM, cd2401_modem_interrupt, 0,
|
|
|
|
"cd2401_modem", cd2401_modem_interrupt);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR "Could't get cd2401_modem IRQ");
|
|
|
|
goto cleanup_irq_cd2401_errors;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = request_irq(MVME167_IRQ_SER_TX, cd2401_tx_interrupt, 0,
|
|
|
|
"cd2401_txints", cd2401_tx_interrupt);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR "Could't get cd2401_txints IRQ");
|
|
|
|
goto cleanup_irq_cd2401_modem;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = request_irq(MVME167_IRQ_SER_RX, cd2401_rx_interrupt, 0,
|
|
|
|
"cd2401_rxints", cd2401_rx_interrupt);
|
|
|
|
if (ret) {
|
|
|
|
printk(KERN_ERR "Could't get cd2401_rxints IRQ");
|
|
|
|
goto cleanup_irq_cd2401_txints;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Now we have registered the interrupt handlers, allow the interrupts */
|
|
|
|
|
|
|
|
pcc2chip[PccSCCMICR] = 0x15; /* Serial ints are level 5 */
|
|
|
|
pcc2chip[PccSCCTICR] = 0x15;
|
|
|
|
pcc2chip[PccSCCRICR] = 0x15;
|
|
|
|
|
|
|
|
pcc2chip[PccIMLR] = 3; /* Allow PCC2 ints above 3!? */
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
cleanup_irq_cd2401_txints:
|
|
|
|
free_irq(MVME167_IRQ_SER_TX, cd2401_tx_interrupt);
|
|
|
|
cleanup_irq_cd2401_modem:
|
|
|
|
free_irq(MVME167_IRQ_SER_MODEM, cd2401_modem_interrupt);
|
|
|
|
cleanup_irq_cd2401_errors:
|
|
|
|
free_irq(MVME167_IRQ_SER_ERR, cd2401_rxerr_interrupt);
|
|
|
|
cleanup_serial_driver:
|
|
|
|
if (tty_unregister_driver(cy_serial_driver))
|
|
|
|
printk(KERN_ERR "Couldn't unregister MVME166/7 serial driver\n");
|
|
|
|
put_tty_driver(cy_serial_driver);
|
|
|
|
return ret;
|
|
|
|
} /* serial167_init */
|
|
|
|
|
|
|
|
module_init(serial167_init);
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef CYCLOM_SHOW_STATUS
|
|
|
|
static void
|
|
|
|
show_status(int line_num)
|
|
|
|
{
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int channel;
|
|
|
|
struct cyclades_port * info;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
info = &cy_port[line_num];
|
|
|
|
channel = info->line;
|
|
|
|
printk(" channel %d\n", channel);/**/
|
|
|
|
|
|
|
|
printk(" cy_port\n");
|
|
|
|
printk(" card line flags = %d %d %x\n",
|
|
|
|
info->card, info->line, info->flags);
|
|
|
|
printk(" *tty read_status_mask timeout xmit_fifo_size = %lx %x %x %x\n",
|
|
|
|
(long)info->tty, info->read_status_mask,
|
|
|
|
info->timeout, info->xmit_fifo_size);
|
|
|
|
printk(" cor1,cor2,cor3,cor4,cor5,cor6,cor7 = %x %x %x %x %x %x %x\n",
|
|
|
|
info->cor1, info->cor2, info->cor3, info->cor4, info->cor5,
|
|
|
|
info->cor6, info->cor7);
|
|
|
|
printk(" tbpr,tco,rbpr,rco = %d %d %d %d\n",
|
|
|
|
info->tbpr, info->tco, info->rbpr, info->rco);
|
|
|
|
printk(" close_delay event count = %d %d %d\n",
|
|
|
|
info->close_delay, info->event, info->count);
|
|
|
|
printk(" x_char blocked_open = %x %x\n",
|
|
|
|
info->x_char, info->blocked_open);
|
|
|
|
printk(" open_wait = %lx %lx %lx\n",
|
|
|
|
(long)info->open_wait);
|
|
|
|
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
|
|
|
/* Global Registers */
|
|
|
|
|
|
|
|
printk(" CyGFRCR %x\n", base_addr[CyGFRCR]);
|
|
|
|
printk(" CyCAR %x\n", base_addr[CyCAR]);
|
|
|
|
printk(" CyRISR %x\n", base_addr[CyRISR]);
|
|
|
|
printk(" CyTISR %x\n", base_addr[CyTISR]);
|
|
|
|
printk(" CyMISR %x\n", base_addr[CyMISR]);
|
|
|
|
printk(" CyRIR %x\n", base_addr[CyRIR]);
|
|
|
|
printk(" CyTIR %x\n", base_addr[CyTIR]);
|
|
|
|
printk(" CyMIR %x\n", base_addr[CyMIR]);
|
|
|
|
printk(" CyTPR %x\n", base_addr[CyTPR]);
|
|
|
|
|
|
|
|
base_addr[CyCAR] = (u_char)channel;
|
|
|
|
|
|
|
|
/* Virtual Registers */
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
printk(" CyRIVR %x\n", base_addr[CyRIVR]);
|
|
|
|
printk(" CyTIVR %x\n", base_addr[CyTIVR]);
|
|
|
|
printk(" CyMIVR %x\n", base_addr[CyMIVR]);
|
|
|
|
printk(" CyMISR %x\n", base_addr[CyMISR]);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Channel Registers */
|
|
|
|
|
|
|
|
printk(" CyCCR %x\n", base_addr[CyCCR]);
|
|
|
|
printk(" CyIER %x\n", base_addr[CyIER]);
|
|
|
|
printk(" CyCOR1 %x\n", base_addr[CyCOR1]);
|
|
|
|
printk(" CyCOR2 %x\n", base_addr[CyCOR2]);
|
|
|
|
printk(" CyCOR3 %x\n", base_addr[CyCOR3]);
|
|
|
|
printk(" CyCOR4 %x\n", base_addr[CyCOR4]);
|
|
|
|
printk(" CyCOR5 %x\n", base_addr[CyCOR5]);
|
|
|
|
#if 0
|
|
|
|
printk(" CyCCSR %x\n", base_addr[CyCCSR]);
|
|
|
|
printk(" CyRDCR %x\n", base_addr[CyRDCR]);
|
|
|
|
#endif
|
|
|
|
printk(" CySCHR1 %x\n", base_addr[CySCHR1]);
|
|
|
|
printk(" CySCHR2 %x\n", base_addr[CySCHR2]);
|
|
|
|
#if 0
|
|
|
|
printk(" CySCHR3 %x\n", base_addr[CySCHR3]);
|
|
|
|
printk(" CySCHR4 %x\n", base_addr[CySCHR4]);
|
|
|
|
printk(" CySCRL %x\n", base_addr[CySCRL]);
|
|
|
|
printk(" CySCRH %x\n", base_addr[CySCRH]);
|
|
|
|
printk(" CyLNC %x\n", base_addr[CyLNC]);
|
|
|
|
printk(" CyMCOR1 %x\n", base_addr[CyMCOR1]);
|
|
|
|
printk(" CyMCOR2 %x\n", base_addr[CyMCOR2]);
|
|
|
|
#endif
|
|
|
|
printk(" CyRTPRL %x\n", base_addr[CyRTPRL]);
|
|
|
|
printk(" CyRTPRH %x\n", base_addr[CyRTPRH]);
|
|
|
|
printk(" CyMSVR1 %x\n", base_addr[CyMSVR1]);
|
|
|
|
printk(" CyMSVR2 %x\n", base_addr[CyMSVR2]);
|
|
|
|
printk(" CyRBPR %x\n", base_addr[CyRBPR]);
|
|
|
|
printk(" CyRCOR %x\n", base_addr[CyRCOR]);
|
|
|
|
printk(" CyTBPR %x\n", base_addr[CyTBPR]);
|
|
|
|
printk(" CyTCOR %x\n", base_addr[CyTCOR]);
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
} /* show_status */
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
/* Dummy routine in mvme16x/config.c for now */
|
|
|
|
|
|
|
|
/* Serial console setup. Called from linux/init/main.c */
|
|
|
|
|
|
|
|
void console_setup(char *str, int *ints)
|
|
|
|
{
|
|
|
|
char *s;
|
|
|
|
int baud, bits, parity;
|
|
|
|
int cflag = 0;
|
|
|
|
|
|
|
|
/* Sanity check. */
|
|
|
|
if (ints[0] > 3 || ints[1] > 3) return;
|
|
|
|
|
|
|
|
/* Get baud, bits and parity */
|
|
|
|
baud = 2400;
|
|
|
|
bits = 8;
|
|
|
|
parity = 'n';
|
|
|
|
if (ints[2]) baud = ints[2];
|
|
|
|
if ((s = strchr(str, ','))) {
|
|
|
|
do {
|
|
|
|
s++;
|
|
|
|
} while(*s >= '0' && *s <= '9');
|
|
|
|
if (*s) parity = *s++;
|
|
|
|
if (*s) bits = *s - '0';
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Now construct a cflag setting. */
|
|
|
|
switch(baud) {
|
|
|
|
case 1200:
|
|
|
|
cflag |= B1200;
|
|
|
|
break;
|
|
|
|
case 9600:
|
|
|
|
cflag |= B9600;
|
|
|
|
break;
|
|
|
|
case 19200:
|
|
|
|
cflag |= B19200;
|
|
|
|
break;
|
|
|
|
case 38400:
|
|
|
|
cflag |= B38400;
|
|
|
|
break;
|
|
|
|
case 2400:
|
|
|
|
default:
|
|
|
|
cflag |= B2400;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
switch(bits) {
|
|
|
|
case 7:
|
|
|
|
cflag |= CS7;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
case 8:
|
|
|
|
cflag |= CS8;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
switch(parity) {
|
|
|
|
case 'o': case 'O':
|
|
|
|
cflag |= PARODD;
|
|
|
|
break;
|
|
|
|
case 'e': case 'E':
|
|
|
|
cflag |= PARENB;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
serial_console_info = &cy_port[ints[1]];
|
|
|
|
serial_console_cflag = cflag;
|
|
|
|
serial_console = ints[1] + 64; /*callout_driver.minor_start*/
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The following is probably out of date for 2.1.x serial console stuff.
|
|
|
|
*
|
|
|
|
* The console is registered early on from arch/m68k/kernel/setup.c, and
|
|
|
|
* it therefore relies on the chip being setup correctly by 166-Bug. This
|
|
|
|
* seems reasonable, as the serial port has been used to invoke the system
|
|
|
|
* boot. It also means that this function must not rely on any data
|
|
|
|
* initialisation performed by serial167_init() etc.
|
|
|
|
*
|
|
|
|
* Of course, once the console has been registered, we had better ensure
|
|
|
|
* that serial167_init() doesn't leave the chip non-functional.
|
|
|
|
*
|
|
|
|
* The console must be locked when we get here.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void serial167_console_write(struct console *co, const char *str, unsigned count)
|
|
|
|
{
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
unsigned long flags;
|
|
|
|
volatile u_char sink;
|
|
|
|
u_char ier;
|
|
|
|
int port;
|
|
|
|
u_char do_lf = 0;
|
|
|
|
int i = 0;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
|
|
|
/* Ensure transmitter is enabled! */
|
|
|
|
|
|
|
|
port = 0;
|
|
|
|
base_addr[CyCAR] = (u_char)port;
|
|
|
|
while (base_addr[CyCCR])
|
|
|
|
;
|
|
|
|
base_addr[CyCCR] = CyENB_XMTR;
|
|
|
|
|
|
|
|
ier = base_addr[CyIER];
|
|
|
|
base_addr[CyIER] = CyTxMpty;
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
if (pcc2chip[PccSCCTICR] & 0x20)
|
|
|
|
{
|
|
|
|
/* We have a Tx int. Acknowledge it */
|
|
|
|
sink = pcc2chip[PccTPIACKR];
|
|
|
|
if ((base_addr[CyLICR] >> 2) == port) {
|
|
|
|
if (i == count) {
|
|
|
|
/* Last char of string is now output */
|
|
|
|
base_addr[CyTEOIR] = CyNOTRANS;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (do_lf) {
|
|
|
|
base_addr[CyTDR] = '\n';
|
|
|
|
str++;
|
|
|
|
i++;
|
|
|
|
do_lf = 0;
|
|
|
|
}
|
|
|
|
else if (*str == '\n') {
|
|
|
|
base_addr[CyTDR] = '\r';
|
|
|
|
do_lf = 1;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
base_addr[CyTDR] = *str++;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
base_addr[CyTEOIR] = 0;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
base_addr[CyTEOIR] = CyNOTRANS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
base_addr[CyIER] = ier;
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct tty_driver *serial167_console_device(struct console *c, int *index)
|
|
|
|
{
|
|
|
|
*index = c->index;
|
|
|
|
return cy_serial_driver;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int __init serial167_console_setup(struct console *co, char *options)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static struct console sercons = {
|
|
|
|
.name = "ttyS",
|
|
|
|
.write = serial167_console_write,
|
|
|
|
.device = serial167_console_device,
|
|
|
|
.setup = serial167_console_setup,
|
|
|
|
.flags = CON_PRINTBUFFER,
|
|
|
|
.index = -1,
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static int __init serial167_console_init(void)
|
|
|
|
{
|
|
|
|
if (vme_brdtype == VME_TYPE_MVME166 ||
|
|
|
|
vme_brdtype == VME_TYPE_MVME167 ||
|
|
|
|
vme_brdtype == VME_TYPE_MVME177) {
|
|
|
|
mvme167_serial_console_setup(0);
|
|
|
|
register_console(&sercons);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
console_initcall(serial167_console_init);
|
|
|
|
|
|
|
|
#ifdef CONFIG_REMOTE_DEBUG
|
|
|
|
void putDebugChar (int c)
|
|
|
|
{
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
unsigned long flags;
|
|
|
|
volatile u_char sink;
|
|
|
|
u_char ier;
|
|
|
|
int port;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
|
|
|
/* Ensure transmitter is enabled! */
|
|
|
|
|
|
|
|
port = DEBUG_PORT;
|
|
|
|
base_addr[CyCAR] = (u_char)port;
|
|
|
|
while (base_addr[CyCCR])
|
|
|
|
;
|
|
|
|
base_addr[CyCCR] = CyENB_XMTR;
|
|
|
|
|
|
|
|
ier = base_addr[CyIER];
|
|
|
|
base_addr[CyIER] = CyTxMpty;
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
if (pcc2chip[PccSCCTICR] & 0x20)
|
|
|
|
{
|
|
|
|
/* We have a Tx int. Acknowledge it */
|
|
|
|
sink = pcc2chip[PccTPIACKR];
|
|
|
|
if ((base_addr[CyLICR] >> 2) == port) {
|
|
|
|
base_addr[CyTDR] = c;
|
|
|
|
base_addr[CyTEOIR] = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
base_addr[CyTEOIR] = CyNOTRANS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
base_addr[CyIER] = ier;
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
int getDebugChar()
|
|
|
|
{
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
unsigned long flags;
|
|
|
|
volatile u_char sink;
|
|
|
|
u_char ier;
|
|
|
|
int port;
|
|
|
|
int i, c;
|
|
|
|
|
|
|
|
i = debugiq.out;
|
|
|
|
if (i != debugiq.in) {
|
|
|
|
c = debugiq.buf[i];
|
|
|
|
if (++i == DEBUG_LEN)
|
|
|
|
i = 0;
|
|
|
|
debugiq.out = i;
|
|
|
|
return c;
|
|
|
|
}
|
|
|
|
/* OK, nothing in queue, wait in poll loop */
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
|
|
|
/* Ensure receiver is enabled! */
|
|
|
|
|
|
|
|
port = DEBUG_PORT;
|
|
|
|
base_addr[CyCAR] = (u_char)port;
|
|
|
|
#if 0
|
|
|
|
while (base_addr[CyCCR])
|
|
|
|
;
|
|
|
|
base_addr[CyCCR] = CyENB_RCVR;
|
|
|
|
#endif
|
|
|
|
ier = base_addr[CyIER];
|
|
|
|
base_addr[CyIER] = CyRxData;
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
if (pcc2chip[PccSCCRICR] & 0x20)
|
|
|
|
{
|
|
|
|
/* We have a Rx int. Acknowledge it */
|
|
|
|
sink = pcc2chip[PccRPIACKR];
|
|
|
|
if ((base_addr[CyLICR] >> 2) == port) {
|
|
|
|
int cnt = base_addr[CyRFOC];
|
|
|
|
while (cnt-- > 0)
|
|
|
|
{
|
|
|
|
c = base_addr[CyRDR];
|
|
|
|
if (c == 0)
|
|
|
|
printk ("!! debug char is null (cnt=%d) !!", cnt);
|
|
|
|
else
|
|
|
|
queueDebugChar (c);
|
|
|
|
}
|
|
|
|
base_addr[CyREOIR] = 0;
|
|
|
|
i = debugiq.out;
|
|
|
|
if (i == debugiq.in)
|
|
|
|
panic ("Debug input queue empty!");
|
|
|
|
c = debugiq.buf[i];
|
|
|
|
if (++i == DEBUG_LEN)
|
|
|
|
i = 0;
|
|
|
|
debugiq.out = i;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
base_addr[CyREOIR] = CyNOTRANS;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
base_addr[CyIER] = ier;
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
return (c);
|
|
|
|
}
|
|
|
|
|
|
|
|
void queueDebugChar (int c)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
i = debugiq.in;
|
|
|
|
debugiq.buf[i] = c;
|
|
|
|
if (++i == DEBUG_LEN)
|
|
|
|
i = 0;
|
|
|
|
if (i != debugiq.out)
|
|
|
|
debugiq.in = i;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
debug_setup()
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
|
|
|
|
int i, cflag;
|
|
|
|
|
|
|
|
cflag = B19200;
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
|
|
|
for (i = 0; i < 4; i++)
|
|
|
|
{
|
|
|
|
base_addr[CyCAR] = i;
|
|
|
|
base_addr[CyLICR] = i << 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
debugiq.in = debugiq.out = 0;
|
|
|
|
|
|
|
|
base_addr[CyCAR] = DEBUG_PORT;
|
|
|
|
|
|
|
|
/* baud rate */
|
|
|
|
i = cflag & CBAUD;
|
|
|
|
|
|
|
|
base_addr[CyIER] = 0;
|
|
|
|
|
|
|
|
base_addr[CyCMR] = CyASYNC;
|
|
|
|
base_addr[CyLICR] = DEBUG_PORT << 2;
|
|
|
|
base_addr[CyLIVR] = 0x5c;
|
|
|
|
|
|
|
|
/* tx and rx baud rate */
|
|
|
|
|
|
|
|
base_addr[CyTCOR] = baud_co[i];
|
|
|
|
base_addr[CyTBPR] = baud_bpr[i];
|
|
|
|
base_addr[CyRCOR] = baud_co[i] >> 5;
|
|
|
|
base_addr[CyRBPR] = baud_bpr[i];
|
|
|
|
|
|
|
|
/* set line characteristics according configuration */
|
|
|
|
|
|
|
|
base_addr[CySCHR1] = 0;
|
|
|
|
base_addr[CySCHR2] = 0;
|
|
|
|
base_addr[CySCRL] = 0;
|
|
|
|
base_addr[CySCRH] = 0;
|
|
|
|
base_addr[CyCOR1] = Cy_8_BITS | CyPARITY_NONE;
|
|
|
|
base_addr[CyCOR2] = 0;
|
|
|
|
base_addr[CyCOR3] = Cy_1_STOP;
|
|
|
|
base_addr[CyCOR4] = baud_cor4[i];
|
|
|
|
base_addr[CyCOR5] = 0;
|
|
|
|
base_addr[CyCOR6] = 0;
|
|
|
|
base_addr[CyCOR7] = 0;
|
|
|
|
|
|
|
|
write_cy_cmd(base_addr,CyINIT_CHAN);
|
|
|
|
write_cy_cmd(base_addr,CyENB_RCVR);
|
|
|
|
|
|
|
|
base_addr[CyCAR] = DEBUG_PORT; /* !!! Is this needed? */
|
|
|
|
|
|
|
|
base_addr[CyRTPRL] = 2;
|
|
|
|
base_addr[CyRTPRH] = 0;
|
|
|
|
|
|
|
|
base_addr[CyMSVR1] = CyRTS;
|
|
|
|
base_addr[CyMSVR2] = CyDTR;
|
|
|
|
|
|
|
|
base_addr[CyIER] = CyRxData;
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
|
|
|
} /* debug_setup */
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|