2139 lines
53 KiB
C
2139 lines
53 KiB
C
/*
|
|
* linux/drivers/char/amiserial.c
|
|
*
|
|
* Serial driver for the amiga builtin port.
|
|
*
|
|
* This code was created by taking serial.c version 4.30 from kernel
|
|
* release 2.3.22, replacing all hardware related stuff with the
|
|
* corresponding amiga hardware actions, and removing all irrelevant
|
|
* code. As a consequence, it uses many of the constants and names
|
|
* associated with the registers and bits of 16550 compatible UARTS -
|
|
* but only to keep track of status, etc in the state variables. It
|
|
* was done this was to make it easier to keep the code in line with
|
|
* (non hardware specific) changes to serial.c.
|
|
*
|
|
* The port is registered with the tty driver as minor device 64, and
|
|
* therefore other ports should should only use 65 upwards.
|
|
*
|
|
* Richard Lucock 28/12/99
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
|
|
* 1998, 1999 Theodore Ts'o
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Serial driver configuration section. Here are the various options:
|
|
*
|
|
* SERIAL_PARANOIA_CHECK
|
|
* Check the magic number for the async_structure where
|
|
* ever possible.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#undef SERIAL_PARANOIA_CHECK
|
|
#define SERIAL_DO_RESTART
|
|
|
|
/* Set of debugging defines */
|
|
|
|
#undef SERIAL_DEBUG_INTR
|
|
#undef SERIAL_DEBUG_OPEN
|
|
#undef SERIAL_DEBUG_FLOW
|
|
#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
|
|
|
/* Sanity checks */
|
|
|
|
#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
|
|
#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
|
|
tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
|
|
#else
|
|
#define DBG_CNT(s)
|
|
#endif
|
|
|
|
/*
|
|
* End of serial driver configuration section.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serialP.h>
|
|
#include <linux/serial_reg.h>
|
|
static char *serial_version = "4.30";
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/console.h>
|
|
#include <linux/major.h>
|
|
#include <linux/string.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/setup.h>
|
|
|
|
#include <asm/system.h>
|
|
|
|
#include <asm/irq.h>
|
|
|
|
#include <asm/amigahw.h>
|
|
#include <asm/amigaints.h>
|
|
|
|
#define custom amiga_custom
|
|
static char *serial_name = "Amiga-builtin serial driver";
|
|
|
|
static struct tty_driver *serial_driver;
|
|
|
|
/* number of characters left in xmit buffer before we ask for more */
|
|
#define WAKEUP_CHARS 256
|
|
|
|
static struct async_struct *IRQ_ports;
|
|
|
|
static unsigned char current_ctl_bits;
|
|
|
|
static void change_speed(struct async_struct *info, struct termios *old);
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
|
|
|
|
|
|
static struct serial_state rs_table[1];
|
|
|
|
#define NR_PORTS ARRAY_SIZE(rs_table)
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
#define serial_isroot() (capable(CAP_SYS_ADMIN))
|
|
|
|
|
|
static inline int serial_paranoia_check(struct async_struct *info,
|
|
char *name, const char *routine)
|
|
{
|
|
#ifdef SERIAL_PARANOIA_CHECK
|
|
static const char *badmagic =
|
|
"Warning: bad magic number for serial struct (%s) in %s\n";
|
|
static const char *badinfo =
|
|
"Warning: null async_struct for (%s) in %s\n";
|
|
|
|
if (!info) {
|
|
printk(badinfo, name, routine);
|
|
return 1;
|
|
}
|
|
if (info->magic != SERIAL_MAGIC) {
|
|
printk(badmagic, name, routine);
|
|
return 1;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/* some serial hardware definitions */
|
|
#define SDR_OVRUN (1<<15)
|
|
#define SDR_RBF (1<<14)
|
|
#define SDR_TBE (1<<13)
|
|
#define SDR_TSRE (1<<12)
|
|
|
|
#define SERPER_PARENB (1<<15)
|
|
|
|
#define AC_SETCLR (1<<15)
|
|
#define AC_UARTBRK (1<<11)
|
|
|
|
#define SER_DTR (1<<7)
|
|
#define SER_RTS (1<<6)
|
|
#define SER_DCD (1<<5)
|
|
#define SER_CTS (1<<4)
|
|
#define SER_DSR (1<<3)
|
|
|
|
static __inline__ void rtsdtr_ctrl(int bits)
|
|
{
|
|
ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_stop() and rs_start()
|
|
*
|
|
* This routines are called before setting or resetting tty->stopped.
|
|
* They enable or disable transmitter interrupts, as necessary.
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static void rs_stop(struct tty_struct *tty)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_stop"))
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
if (info->IER & UART_IER_THRI) {
|
|
info->IER &= ~UART_IER_THRI;
|
|
/* disable Tx interrupt and remove any pending interrupts */
|
|
custom.intena = IF_TBE;
|
|
mb();
|
|
custom.intreq = IF_TBE;
|
|
mb();
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void rs_start(struct tty_struct *tty)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_start"))
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
if (info->xmit.head != info->xmit.tail
|
|
&& info->xmit.buf
|
|
&& !(info->IER & UART_IER_THRI)) {
|
|
info->IER |= UART_IER_THRI;
|
|
custom.intena = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
|
custom.intreq = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* ----------------------------------------------------------------------
|
|
*
|
|
* Here starts the interrupt handling routines. All of the following
|
|
* subroutines are declared as inline and are folded into
|
|
* rs_interrupt(). They were separated out for readability's sake.
|
|
*
|
|
* Note: rs_interrupt() is a "fast" interrupt, which means that it
|
|
* runs with interrupts turned off. People who may want to modify
|
|
* rs_interrupt() should try to keep the interrupt handler as fast as
|
|
* possible. After you are done making modifications, it is not a bad
|
|
* idea to do:
|
|
*
|
|
* gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
|
|
*
|
|
* and look at the resulting assemble code in serial.s.
|
|
*
|
|
* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
|
|
* -----------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* This routine is used by the interrupt handler to schedule
|
|
* processing in the software interrupt portion of the driver.
|
|
*/
|
|
static void rs_sched_event(struct async_struct *info,
|
|
int event)
|
|
{
|
|
info->event |= 1 << event;
|
|
tasklet_schedule(&info->tlet);
|
|
}
|
|
|
|
static void receive_chars(struct async_struct *info)
|
|
{
|
|
int status;
|
|
int serdatr;
|
|
struct tty_struct *tty = info->tty;
|
|
unsigned char ch, flag;
|
|
struct async_icount *icount;
|
|
int oe = 0;
|
|
|
|
icount = &info->state->icount;
|
|
|
|
status = UART_LSR_DR; /* We obviously have a character! */
|
|
serdatr = custom.serdatr;
|
|
mb();
|
|
custom.intreq = IF_RBF;
|
|
mb();
|
|
|
|
if((serdatr & 0x1ff) == 0)
|
|
status |= UART_LSR_BI;
|
|
if(serdatr & SDR_OVRUN)
|
|
status |= UART_LSR_OE;
|
|
|
|
ch = serdatr & 0xff;
|
|
icount->rx++;
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("DR%02x:%02x...", ch, status);
|
|
#endif
|
|
flag = TTY_NORMAL;
|
|
|
|
/*
|
|
* We don't handle parity or frame errors - but I have left
|
|
* the code in, since I'm not sure that the errors can't be
|
|
* detected.
|
|
*/
|
|
|
|
if (status & (UART_LSR_BI | UART_LSR_PE |
|
|
UART_LSR_FE | UART_LSR_OE)) {
|
|
/*
|
|
* For statistics only
|
|
*/
|
|
if (status & UART_LSR_BI) {
|
|
status &= ~(UART_LSR_FE | UART_LSR_PE);
|
|
icount->brk++;
|
|
} else if (status & UART_LSR_PE)
|
|
icount->parity++;
|
|
else if (status & UART_LSR_FE)
|
|
icount->frame++;
|
|
if (status & UART_LSR_OE)
|
|
icount->overrun++;
|
|
|
|
/*
|
|
* Now check to see if character should be
|
|
* ignored, and mask off conditions which
|
|
* should be ignored.
|
|
*/
|
|
if (status & info->ignore_status_mask)
|
|
goto out;
|
|
|
|
status &= info->read_status_mask;
|
|
|
|
if (status & (UART_LSR_BI)) {
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("handling break....");
|
|
#endif
|
|
flag = TTY_BREAK;
|
|
if (info->flags & ASYNC_SAK)
|
|
do_SAK(tty);
|
|
} else if (status & UART_LSR_PE)
|
|
flag = TTY_PARITY;
|
|
else if (status & UART_LSR_FE)
|
|
flag = TTY_FRAME;
|
|
if (status & UART_LSR_OE) {
|
|
/*
|
|
* Overrun is special, since it's
|
|
* reported immediately, and doesn't
|
|
* affect the current character
|
|
*/
|
|
oe = 1;
|
|
}
|
|
}
|
|
tty_insert_flip_char(tty, ch, flag);
|
|
if (oe == 1)
|
|
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
|
|
tty_flip_buffer_push(tty);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
static void transmit_chars(struct async_struct *info)
|
|
{
|
|
custom.intreq = IF_TBE;
|
|
mb();
|
|
if (info->x_char) {
|
|
custom.serdat = info->x_char | 0x100;
|
|
mb();
|
|
info->state->icount.tx++;
|
|
info->x_char = 0;
|
|
return;
|
|
}
|
|
if (info->xmit.head == info->xmit.tail
|
|
|| info->tty->stopped
|
|
|| info->tty->hw_stopped) {
|
|
info->IER &= ~UART_IER_THRI;
|
|
custom.intena = IF_TBE;
|
|
mb();
|
|
return;
|
|
}
|
|
|
|
custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
|
|
mb();
|
|
info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
|
|
info->state->icount.tx++;
|
|
|
|
if (CIRC_CNT(info->xmit.head,
|
|
info->xmit.tail,
|
|
SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
|
|
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("THRE...");
|
|
#endif
|
|
if (info->xmit.head == info->xmit.tail) {
|
|
custom.intena = IF_TBE;
|
|
mb();
|
|
info->IER &= ~UART_IER_THRI;
|
|
}
|
|
}
|
|
|
|
static void check_modem_status(struct async_struct *info)
|
|
{
|
|
unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
|
|
unsigned char dstatus;
|
|
struct async_icount *icount;
|
|
|
|
/* Determine bits that have changed */
|
|
dstatus = status ^ current_ctl_bits;
|
|
current_ctl_bits = status;
|
|
|
|
if (dstatus) {
|
|
icount = &info->state->icount;
|
|
/* update input line counters */
|
|
if (dstatus & SER_DSR)
|
|
icount->dsr++;
|
|
if (dstatus & SER_DCD) {
|
|
icount->dcd++;
|
|
#ifdef CONFIG_HARD_PPS
|
|
if ((info->flags & ASYNC_HARDPPS_CD) &&
|
|
!(status & SER_DCD))
|
|
hardpps();
|
|
#endif
|
|
}
|
|
if (dstatus & SER_CTS)
|
|
icount->cts++;
|
|
wake_up_interruptible(&info->delta_msr_wait);
|
|
}
|
|
|
|
if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
|
|
#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
|
|
printk("ttyS%d CD now %s...", info->line,
|
|
(!(status & SER_DCD)) ? "on" : "off");
|
|
#endif
|
|
if (!(status & SER_DCD))
|
|
wake_up_interruptible(&info->open_wait);
|
|
else {
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("doing serial hangup...");
|
|
#endif
|
|
if (info->tty)
|
|
tty_hangup(info->tty);
|
|
}
|
|
}
|
|
if (info->flags & ASYNC_CTS_FLOW) {
|
|
if (info->tty->hw_stopped) {
|
|
if (!(status & SER_CTS)) {
|
|
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
|
|
printk("CTS tx start...");
|
|
#endif
|
|
info->tty->hw_stopped = 0;
|
|
info->IER |= UART_IER_THRI;
|
|
custom.intena = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
|
custom.intreq = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
|
|
return;
|
|
}
|
|
} else {
|
|
if ((status & SER_CTS)) {
|
|
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
|
|
printk("CTS tx stop...");
|
|
#endif
|
|
info->tty->hw_stopped = 1;
|
|
info->IER &= ~UART_IER_THRI;
|
|
/* disable Tx interrupt and remove any pending interrupts */
|
|
custom.intena = IF_TBE;
|
|
mb();
|
|
custom.intreq = IF_TBE;
|
|
mb();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static irqreturn_t ser_vbl_int( int irq, void *data)
|
|
{
|
|
/* vbl is just a periodic interrupt we tie into to update modem status */
|
|
struct async_struct * info = IRQ_ports;
|
|
/*
|
|
* TBD - is it better to unregister from this interrupt or to
|
|
* ignore it if MSI is clear ?
|
|
*/
|
|
if(info->IER & UART_IER_MSI)
|
|
check_modem_status(info);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t ser_rx_int(int irq, void *dev_id)
|
|
{
|
|
struct async_struct * info;
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("ser_rx_int...");
|
|
#endif
|
|
|
|
info = IRQ_ports;
|
|
if (!info || !info->tty)
|
|
return IRQ_NONE;
|
|
|
|
receive_chars(info);
|
|
info->last_active = jiffies;
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("end.\n");
|
|
#endif
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t ser_tx_int(int irq, void *dev_id)
|
|
{
|
|
struct async_struct * info;
|
|
|
|
if (custom.serdatr & SDR_TBE) {
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("ser_tx_int...");
|
|
#endif
|
|
|
|
info = IRQ_ports;
|
|
if (!info || !info->tty)
|
|
return IRQ_NONE;
|
|
|
|
transmit_chars(info);
|
|
info->last_active = jiffies;
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("end.\n");
|
|
#endif
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* -------------------------------------------------------------------
|
|
* Here ends the serial interrupt routines.
|
|
* -------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* 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
|
|
* rs_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 rs_sched_event(), and they get done here.
|
|
*/
|
|
|
|
static void do_softint(unsigned long private_)
|
|
{
|
|
struct async_struct *info = (struct async_struct *) private_;
|
|
struct tty_struct *tty;
|
|
|
|
tty = info->tty;
|
|
if (!tty)
|
|
return;
|
|
|
|
if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
|
|
tty_wakeup(tty);
|
|
wake_up_interruptible(&tty->write_wait);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ---------------------------------------------------------------
|
|
* Low level utility subroutines for the serial driver: routines to
|
|
* figure out the appropriate timeout for an interrupt chain, routines
|
|
* to initialize and startup a serial port, and routines to shutdown a
|
|
* serial port. Useful stuff like that.
|
|
* ---------------------------------------------------------------
|
|
*/
|
|
|
|
static int startup(struct async_struct * info)
|
|
{
|
|
unsigned long flags;
|
|
int retval=0;
|
|
unsigned long page;
|
|
|
|
page = get_zeroed_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
|
free_page(page);
|
|
goto errout;
|
|
}
|
|
|
|
if (info->xmit.buf)
|
|
free_page(page);
|
|
else
|
|
info->xmit.buf = (unsigned char *) page;
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("starting up ttys%d ...", info->line);
|
|
#endif
|
|
|
|
/* Clear anything in the input buffer */
|
|
|
|
custom.intreq = IF_RBF;
|
|
mb();
|
|
|
|
retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
|
|
if (retval) {
|
|
if (serial_isroot()) {
|
|
if (info->tty)
|
|
set_bit(TTY_IO_ERROR,
|
|
&info->tty->flags);
|
|
retval = 0;
|
|
}
|
|
goto errout;
|
|
}
|
|
|
|
/* enable both Rx and Tx interrupts */
|
|
custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
|
|
mb();
|
|
info->IER = UART_IER_MSI;
|
|
|
|
/* remember current state of the DCD and CTS bits */
|
|
current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
|
|
|
|
IRQ_ports = info;
|
|
|
|
info->MCR = 0;
|
|
if (info->tty->termios->c_cflag & CBAUD)
|
|
info->MCR = SER_DTR | SER_RTS;
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
if (info->tty)
|
|
clear_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
info->xmit.head = info->xmit.tail = 0;
|
|
|
|
/*
|
|
* Set up the tty->alt_speed kludge
|
|
*/
|
|
if (info->tty) {
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
|
info->tty->alt_speed = 57600;
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
|
info->tty->alt_speed = 115200;
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
|
info->tty->alt_speed = 230400;
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
|
info->tty->alt_speed = 460800;
|
|
}
|
|
|
|
/*
|
|
* and set the speed of the serial port
|
|
*/
|
|
change_speed(info, NULL);
|
|
|
|
info->flags |= ASYNC_INITIALIZED;
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
|
|
errout:
|
|
local_irq_restore(flags);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* This routine will shutdown a serial port; interrupts are disabled, and
|
|
* DTR is dropped if the hangup on close termio flag is on.
|
|
*/
|
|
static void shutdown(struct async_struct * info)
|
|
{
|
|
unsigned long flags;
|
|
struct serial_state *state;
|
|
|
|
if (!(info->flags & ASYNC_INITIALIZED))
|
|
return;
|
|
|
|
state = info->state;
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("Shutting down serial port %d ....\n", info->line);
|
|
#endif
|
|
|
|
local_irq_save(flags); /* Disable interrupts */
|
|
|
|
/*
|
|
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
|
|
* here so the queue might never be waken up
|
|
*/
|
|
wake_up_interruptible(&info->delta_msr_wait);
|
|
|
|
IRQ_ports = NULL;
|
|
|
|
/*
|
|
* Free the IRQ, if necessary
|
|
*/
|
|
free_irq(IRQ_AMIGA_VERTB, info);
|
|
|
|
if (info->xmit.buf) {
|
|
free_page((unsigned long) info->xmit.buf);
|
|
info->xmit.buf = NULL;
|
|
}
|
|
|
|
info->IER = 0;
|
|
custom.intena = IF_RBF | IF_TBE;
|
|
mb();
|
|
|
|
/* disable break condition */
|
|
custom.adkcon = AC_UARTBRK;
|
|
mb();
|
|
|
|
if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
|
|
info->MCR &= ~(SER_DTR|SER_RTS);
|
|
rtsdtr_ctrl(info->MCR);
|
|
|
|
if (info->tty)
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
|
|
|
info->flags &= ~ASYNC_INITIALIZED;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
/*
|
|
* This routine is called to set the UART divisor registers to match
|
|
* the specified baud rate for a serial port.
|
|
*/
|
|
static void change_speed(struct async_struct *info,
|
|
struct termios *old_termios)
|
|
{
|
|
int quot = 0, baud_base, baud;
|
|
unsigned cflag, cval = 0;
|
|
int bits;
|
|
unsigned long flags;
|
|
|
|
if (!info->tty || !info->tty->termios)
|
|
return;
|
|
cflag = info->tty->termios->c_cflag;
|
|
|
|
/* Byte size is always 8 bits plus parity bit if requested */
|
|
|
|
cval = 3; bits = 10;
|
|
if (cflag & CSTOPB) {
|
|
cval |= 0x04;
|
|
bits++;
|
|
}
|
|
if (cflag & PARENB) {
|
|
cval |= UART_LCR_PARITY;
|
|
bits++;
|
|
}
|
|
if (!(cflag & PARODD))
|
|
cval |= UART_LCR_EPAR;
|
|
#ifdef CMSPAR
|
|
if (cflag & CMSPAR)
|
|
cval |= UART_LCR_SPAR;
|
|
#endif
|
|
|
|
/* Determine divisor based on baud rate */
|
|
baud = tty_get_baud_rate(info->tty);
|
|
if (!baud)
|
|
baud = 9600; /* B0 transition handled in rs_set_termios */
|
|
baud_base = info->state->baud_base;
|
|
if (baud == 38400 &&
|
|
((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
|
|
quot = info->state->custom_divisor;
|
|
else {
|
|
if (baud == 134)
|
|
/* Special case since 134 is really 134.5 */
|
|
quot = (2*baud_base / 269);
|
|
else if (baud)
|
|
quot = baud_base / baud;
|
|
}
|
|
/* If the quotient is zero refuse the change */
|
|
if (!quot && old_termios) {
|
|
info->tty->termios->c_cflag &= ~CBAUD;
|
|
info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
|
|
baud = tty_get_baud_rate(info->tty);
|
|
if (!baud)
|
|
baud = 9600;
|
|
if (baud == 38400 &&
|
|
((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
|
|
quot = info->state->custom_divisor;
|
|
else {
|
|
if (baud == 134)
|
|
/* Special case since 134 is really 134.5 */
|
|
quot = (2*baud_base / 269);
|
|
else if (baud)
|
|
quot = baud_base / baud;
|
|
}
|
|
}
|
|
/* As a last resort, if the quotient is zero, default to 9600 bps */
|
|
if (!quot)
|
|
quot = baud_base / 9600;
|
|
info->quot = quot;
|
|
info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
|
|
info->timeout += HZ/50; /* Add .02 seconds of slop */
|
|
|
|
/* CTS flow control flag and modem status interrupts */
|
|
info->IER &= ~UART_IER_MSI;
|
|
if (info->flags & ASYNC_HARDPPS_CD)
|
|
info->IER |= UART_IER_MSI;
|
|
if (cflag & CRTSCTS) {
|
|
info->flags |= ASYNC_CTS_FLOW;
|
|
info->IER |= UART_IER_MSI;
|
|
} else
|
|
info->flags &= ~ASYNC_CTS_FLOW;
|
|
if (cflag & CLOCAL)
|
|
info->flags &= ~ASYNC_CHECK_CD;
|
|
else {
|
|
info->flags |= ASYNC_CHECK_CD;
|
|
info->IER |= UART_IER_MSI;
|
|
}
|
|
/* TBD:
|
|
* Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
|
|
*/
|
|
|
|
/*
|
|
* Set up parity check flag
|
|
*/
|
|
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
|
|
|
|
info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
|
|
if (I_INPCK(info->tty))
|
|
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
|
|
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
|
|
info->read_status_mask |= UART_LSR_BI;
|
|
|
|
/*
|
|
* Characters to ignore
|
|
*/
|
|
info->ignore_status_mask = 0;
|
|
if (I_IGNPAR(info->tty))
|
|
info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
|
|
if (I_IGNBRK(info->tty)) {
|
|
info->ignore_status_mask |= UART_LSR_BI;
|
|
/*
|
|
* If we're ignore parity and break indicators, ignore
|
|
* overruns too. (For real raw support).
|
|
*/
|
|
if (I_IGNPAR(info->tty))
|
|
info->ignore_status_mask |= UART_LSR_OE;
|
|
}
|
|
/*
|
|
* !!! ignore all characters if CREAD is not set
|
|
*/
|
|
if ((cflag & CREAD) == 0)
|
|
info->ignore_status_mask |= UART_LSR_DR;
|
|
local_irq_save(flags);
|
|
|
|
{
|
|
short serper;
|
|
|
|
/* Set up the baud rate */
|
|
serper = quot - 1;
|
|
|
|
/* Enable or disable parity bit */
|
|
|
|
if(cval & UART_LCR_PARITY)
|
|
serper |= (SERPER_PARENB);
|
|
|
|
custom.serper = serper;
|
|
mb();
|
|
}
|
|
|
|
info->LCR = cval; /* Save LCR */
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
struct async_struct *info;
|
|
unsigned long flags;
|
|
|
|
if (!tty)
|
|
return;
|
|
|
|
info = tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_put_char"))
|
|
return;
|
|
|
|
if (!info->xmit.buf)
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
if (CIRC_SPACE(info->xmit.head,
|
|
info->xmit.tail,
|
|
SERIAL_XMIT_SIZE) == 0) {
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
|
|
info->xmit.buf[info->xmit.head++] = ch;
|
|
info->xmit.head &= SERIAL_XMIT_SIZE-1;
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
|
|
return;
|
|
|
|
if (info->xmit.head == info->xmit.tail
|
|
|| tty->stopped
|
|
|| tty->hw_stopped
|
|
|| !info->xmit.buf)
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
info->IER |= UART_IER_THRI;
|
|
custom.intena = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
|
custom.intreq = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
|
|
{
|
|
int c, ret = 0;
|
|
struct async_struct *info;
|
|
unsigned long flags;
|
|
|
|
if (!tty)
|
|
return 0;
|
|
|
|
info = tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write"))
|
|
return 0;
|
|
|
|
if (!info->xmit.buf)
|
|
return 0;
|
|
|
|
local_save_flags(flags);
|
|
local_irq_disable();
|
|
while (1) {
|
|
c = CIRC_SPACE_TO_END(info->xmit.head,
|
|
info->xmit.tail,
|
|
SERIAL_XMIT_SIZE);
|
|
if (count < c)
|
|
c = count;
|
|
if (c <= 0) {
|
|
break;
|
|
}
|
|
memcpy(info->xmit.buf + info->xmit.head, buf, c);
|
|
info->xmit.head = ((info->xmit.head + c) &
|
|
(SERIAL_XMIT_SIZE-1));
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
local_irq_restore(flags);
|
|
|
|
if (info->xmit.head != info->xmit.tail
|
|
&& !tty->stopped
|
|
&& !tty->hw_stopped
|
|
&& !(info->IER & UART_IER_THRI)) {
|
|
info->IER |= UART_IER_THRI;
|
|
local_irq_disable();
|
|
custom.intena = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
|
custom.intreq = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
local_irq_restore(flags);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int rs_write_room(struct tty_struct *tty)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write_room"))
|
|
return 0;
|
|
return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
|
|
}
|
|
|
|
static int rs_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
|
|
return 0;
|
|
return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
|
|
}
|
|
|
|
static void rs_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
|
|
return;
|
|
local_irq_save(flags);
|
|
info->xmit.head = info->xmit.tail = 0;
|
|
local_irq_restore(flags);
|
|
wake_up_interruptible(&tty->write_wait);
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
/*
|
|
* This function is used to send a high-priority XON/XOFF character to
|
|
* the device
|
|
*/
|
|
static void rs_send_xchar(struct tty_struct *tty, char ch)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_send_char"))
|
|
return;
|
|
|
|
info->x_char = ch;
|
|
if (ch) {
|
|
/* Make sure transmit interrupts are on */
|
|
|
|
/* Check this ! */
|
|
local_irq_save(flags);
|
|
if(!(custom.intenar & IF_TBE)) {
|
|
custom.intena = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
/* set a pending Tx Interrupt, transmitter should restart now */
|
|
custom.intreq = IF_SETCLR | IF_TBE;
|
|
mb();
|
|
}
|
|
local_irq_restore(flags);
|
|
|
|
info->IER |= UART_IER_THRI;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_throttle()
|
|
*
|
|
* This routine is called by the upper-layer tty layer to signal that
|
|
* incoming characters should be throttled.
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static void rs_throttle(struct tty_struct * tty)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
char buf[64];
|
|
|
|
printk("throttle %s: %d....\n", tty_name(tty, buf),
|
|
tty->ldisc.chars_in_buffer(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_throttle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty))
|
|
rs_send_xchar(tty, STOP_CHAR(tty));
|
|
|
|
if (tty->termios->c_cflag & CRTSCTS)
|
|
info->MCR &= ~SER_RTS;
|
|
|
|
local_irq_save(flags);
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static void rs_unthrottle(struct tty_struct * tty)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
char buf[64];
|
|
|
|
printk("unthrottle %s: %d....\n", tty_name(tty, buf),
|
|
tty->ldisc.chars_in_buffer(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
|
|
return;
|
|
|
|
if (I_IXOFF(tty)) {
|
|
if (info->x_char)
|
|
info->x_char = 0;
|
|
else
|
|
rs_send_xchar(tty, START_CHAR(tty));
|
|
}
|
|
if (tty->termios->c_cflag & CRTSCTS)
|
|
info->MCR |= SER_RTS;
|
|
local_irq_save(flags);
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_ioctl() and friends
|
|
* ------------------------------------------------------------
|
|
*/
|
|
|
|
static int get_serial_info(struct async_struct * info,
|
|
struct serial_struct __user * retinfo)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct serial_state *state = info->state;
|
|
|
|
if (!retinfo)
|
|
return -EFAULT;
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
tmp.type = state->type;
|
|
tmp.line = state->line;
|
|
tmp.port = state->port;
|
|
tmp.irq = state->irq;
|
|
tmp.flags = state->flags;
|
|
tmp.xmit_fifo_size = state->xmit_fifo_size;
|
|
tmp.baud_base = state->baud_base;
|
|
tmp.close_delay = state->close_delay;
|
|
tmp.closing_wait = state->closing_wait;
|
|
tmp.custom_divisor = state->custom_divisor;
|
|
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int set_serial_info(struct async_struct * info,
|
|
struct serial_struct __user * new_info)
|
|
{
|
|
struct serial_struct new_serial;
|
|
struct serial_state old_state, *state;
|
|
unsigned int change_irq,change_port;
|
|
int retval = 0;
|
|
|
|
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
|
|
return -EFAULT;
|
|
state = info->state;
|
|
old_state = *state;
|
|
|
|
change_irq = new_serial.irq != state->irq;
|
|
change_port = (new_serial.port != state->port);
|
|
if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
|
|
return -EINVAL;
|
|
|
|
if (!serial_isroot()) {
|
|
if ((new_serial.baud_base != state->baud_base) ||
|
|
(new_serial.close_delay != state->close_delay) ||
|
|
(new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
|
|
((new_serial.flags & ~ASYNC_USR_MASK) !=
|
|
(state->flags & ~ASYNC_USR_MASK)))
|
|
return -EPERM;
|
|
state->flags = ((state->flags & ~ASYNC_USR_MASK) |
|
|
(new_serial.flags & ASYNC_USR_MASK));
|
|
info->flags = ((info->flags & ~ASYNC_USR_MASK) |
|
|
(new_serial.flags & ASYNC_USR_MASK));
|
|
state->custom_divisor = new_serial.custom_divisor;
|
|
goto check_and_exit;
|
|
}
|
|
|
|
if (new_serial.baud_base < 9600)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* OK, past this point, all the error checking has been done.
|
|
* At this point, we start making changes.....
|
|
*/
|
|
|
|
state->baud_base = new_serial.baud_base;
|
|
state->flags = ((state->flags & ~ASYNC_FLAGS) |
|
|
(new_serial.flags & ASYNC_FLAGS));
|
|
info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
|
|
(info->flags & ASYNC_INTERNAL_FLAGS));
|
|
state->custom_divisor = new_serial.custom_divisor;
|
|
state->close_delay = new_serial.close_delay * HZ/100;
|
|
state->closing_wait = new_serial.closing_wait * HZ/100;
|
|
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
|
|
|
|
check_and_exit:
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
|
if (((old_state.flags & ASYNC_SPD_MASK) !=
|
|
(state->flags & ASYNC_SPD_MASK)) ||
|
|
(old_state.custom_divisor != state->custom_divisor)) {
|
|
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
|
info->tty->alt_speed = 57600;
|
|
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
|
info->tty->alt_speed = 115200;
|
|
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
|
info->tty->alt_speed = 230400;
|
|
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
|
info->tty->alt_speed = 460800;
|
|
change_speed(info, NULL);
|
|
}
|
|
} else
|
|
retval = startup(info);
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*
|
|
* get_lsr_info - get line status register info
|
|
*
|
|
* Purpose: Let user call ioctl() to get info when the UART physically
|
|
* is emptied. On bus types like RS485, the transmitter must
|
|
* release the bus after transmitting. This must be done when
|
|
* the transmit shift register is empty, not be done when the
|
|
* transmit holding register is empty. This functionality
|
|
* allows an RS485 driver to be written in user space.
|
|
*/
|
|
static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
|
|
{
|
|
unsigned char status;
|
|
unsigned int result;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
status = custom.serdatr;
|
|
mb();
|
|
local_irq_restore(flags);
|
|
result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
|
|
if (copy_to_user(value, &result, sizeof(int)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int rs_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
|
unsigned char control, status;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
|
|
control = info->MCR;
|
|
local_irq_save(flags);
|
|
status = ciab.pra;
|
|
local_irq_restore(flags);
|
|
return ((control & SER_RTS) ? TIOCM_RTS : 0)
|
|
| ((control & SER_DTR) ? TIOCM_DTR : 0)
|
|
| (!(status & SER_DCD) ? TIOCM_CAR : 0)
|
|
| (!(status & SER_DSR) ? TIOCM_DSR : 0)
|
|
| (!(status & SER_CTS) ? TIOCM_CTS : 0);
|
|
}
|
|
|
|
static int rs_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
|
|
local_irq_save(flags);
|
|
if (set & TIOCM_RTS)
|
|
info->MCR |= SER_RTS;
|
|
if (set & TIOCM_DTR)
|
|
info->MCR |= SER_DTR;
|
|
if (clear & TIOCM_RTS)
|
|
info->MCR &= ~SER_RTS;
|
|
if (clear & TIOCM_DTR)
|
|
info->MCR &= ~SER_DTR;
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* rs_break() --- routine which turns the break handling on or off
|
|
*/
|
|
static void rs_break(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_break"))
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
if (break_state == -1)
|
|
custom.adkcon = AC_SETCLR | AC_UARTBRK;
|
|
else
|
|
custom.adkcon = AC_UARTBRK;
|
|
mb();
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
static int rs_ioctl(struct tty_struct *tty, struct file * file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
|
struct async_icount cprev, cnow; /* kernel counter temps */
|
|
struct serial_icounter_struct icount;
|
|
void __user *argp = (void __user *)arg;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
|
|
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
|
|
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
|
|
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case TIOCGSERIAL:
|
|
return get_serial_info(info, argp);
|
|
case TIOCSSERIAL:
|
|
return set_serial_info(info, argp);
|
|
case TIOCSERCONFIG:
|
|
return 0;
|
|
|
|
case TIOCSERGETLSR: /* Get line status register */
|
|
return get_lsr_info(info, argp);
|
|
|
|
case TIOCSERGSTRUCT:
|
|
if (copy_to_user(argp,
|
|
info, sizeof(struct async_struct)))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
/*
|
|
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
|
|
* - mask passed in arg for lines of interest
|
|
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
|
|
* Caller should use TIOCGICOUNT to see which one it was
|
|
*/
|
|
case TIOCMIWAIT:
|
|
local_irq_save(flags);
|
|
/* note the counters on entry */
|
|
cprev = info->state->icount;
|
|
local_irq_restore(flags);
|
|
while (1) {
|
|
interruptible_sleep_on(&info->delta_msr_wait);
|
|
/* see if a signal did it */
|
|
if (signal_pending(current))
|
|
return -ERESTARTSYS;
|
|
local_irq_save(flags);
|
|
cnow = info->state->icount; /* atomic copy */
|
|
local_irq_restore(flags);
|
|
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
|
|
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
|
|
return -EIO; /* no change => error */
|
|
if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
|
|
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
|
|
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
|
|
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
|
|
return 0;
|
|
}
|
|
cprev = cnow;
|
|
}
|
|
/* NOTREACHED */
|
|
|
|
/*
|
|
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
|
|
* Return: write counters to the user passed counter struct
|
|
* NB: both 1->0 and 0->1 transitions are counted except for
|
|
* RI where only 0->1 is counted.
|
|
*/
|
|
case TIOCGICOUNT:
|
|
local_irq_save(flags);
|
|
cnow = info->state->icount;
|
|
local_irq_restore(flags);
|
|
icount.cts = cnow.cts;
|
|
icount.dsr = cnow.dsr;
|
|
icount.rng = cnow.rng;
|
|
icount.dcd = cnow.dcd;
|
|
icount.rx = cnow.rx;
|
|
icount.tx = cnow.tx;
|
|
icount.frame = cnow.frame;
|
|
icount.overrun = cnow.overrun;
|
|
icount.parity = cnow.parity;
|
|
icount.brk = cnow.brk;
|
|
icount.buf_overrun = cnow.buf_overrun;
|
|
|
|
if (copy_to_user(argp, &icount, sizeof(icount)))
|
|
return -EFAULT;
|
|
return 0;
|
|
case TIOCSERGWILD:
|
|
case TIOCSERSWILD:
|
|
/* "setserial -W" is called in Debian boot */
|
|
printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
|
|
return 0;
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
|
|
{
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
|
unsigned long flags;
|
|
unsigned int cflag = tty->termios->c_cflag;
|
|
|
|
if ( (cflag == old_termios->c_cflag)
|
|
&& ( RELEVANT_IFLAG(tty->termios->c_iflag)
|
|
== RELEVANT_IFLAG(old_termios->c_iflag)))
|
|
return;
|
|
|
|
change_speed(info, old_termios);
|
|
|
|
/* Handle transition to B0 status */
|
|
if ((old_termios->c_cflag & CBAUD) &&
|
|
!(cflag & CBAUD)) {
|
|
info->MCR &= ~(SER_DTR|SER_RTS);
|
|
local_irq_save(flags);
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* Handle transition away from B0 status */
|
|
if (!(old_termios->c_cflag & CBAUD) &&
|
|
(cflag & CBAUD)) {
|
|
info->MCR |= SER_DTR;
|
|
if (!(tty->termios->c_cflag & CRTSCTS) ||
|
|
!test_bit(TTY_THROTTLED, &tty->flags)) {
|
|
info->MCR |= SER_RTS;
|
|
}
|
|
local_irq_save(flags);
|
|
rtsdtr_ctrl(info->MCR);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* Handle turning off CRTSCTS */
|
|
if ((old_termios->c_cflag & CRTSCTS) &&
|
|
!(tty->termios->c_cflag & CRTSCTS)) {
|
|
tty->hw_stopped = 0;
|
|
rs_start(tty);
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* No need to wake up processes in open wait, since they
|
|
* sample the CLOCAL flag once, and don't recheck it.
|
|
* XXX It's not clear whether the current behavior is correct
|
|
* or not. Hence, this may change.....
|
|
*/
|
|
if (!(old_termios->c_cflag & CLOCAL) &&
|
|
(tty->termios->c_cflag & CLOCAL))
|
|
wake_up_interruptible(&info->open_wait);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_close()
|
|
*
|
|
* This routine is called when the serial port gets closed. First, we
|
|
* wait for the last remaining data to be sent. Then, we unlink its
|
|
* async structure from the interrupt chain if necessary, and we free
|
|
* that IRQ if nothing is left in the chain.
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static void rs_close(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
|
struct serial_state *state;
|
|
unsigned long flags;
|
|
|
|
if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
|
|
return;
|
|
|
|
state = info->state;
|
|
|
|
local_irq_save(flags);
|
|
|
|
if (tty_hung_up_p(filp)) {
|
|
DBG_CNT("before DEC-hung");
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("rs_close ttys%d, count = %d\n", info->line, state->count);
|
|
#endif
|
|
if ((tty->count == 1) && (state->count != 1)) {
|
|
/*
|
|
* Uh, oh. tty->count is 1, which means that the tty
|
|
* structure will be freed. state->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("rs_close: bad serial port count; tty->count is 1, "
|
|
"state->count is %d\n", state->count);
|
|
state->count = 1;
|
|
}
|
|
if (--state->count < 0) {
|
|
printk("rs_close: bad serial port count for ttys%d: %d\n",
|
|
info->line, state->count);
|
|
state->count = 0;
|
|
}
|
|
if (state->count) {
|
|
DBG_CNT("before DEC-2");
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
info->flags |= ASYNC_CLOSING;
|
|
/*
|
|
* Now we wait for the transmit buffer to clear; and we notify
|
|
* the line discipline to only process XON/XOFF characters.
|
|
*/
|
|
tty->closing = 1;
|
|
if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
tty_wait_until_sent(tty, info->closing_wait);
|
|
/*
|
|
* At this point we stop accepting input. To do this, we
|
|
* disable the receive line status interrupts, and tell the
|
|
* interrupt driver to stop checking the data ready bit in the
|
|
* line status register.
|
|
*/
|
|
info->read_status_mask &= ~UART_LSR_DR;
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
|
/* disable receive interrupts */
|
|
custom.intena = IF_RBF;
|
|
mb();
|
|
/* clear any pending receive interrupt */
|
|
custom.intreq = IF_RBF;
|
|
mb();
|
|
|
|
/*
|
|
* Before we drop DTR, make sure the UART transmitter
|
|
* has completely drained; this is especially
|
|
* important if there is a transmit FIFO!
|
|
*/
|
|
rs_wait_until_sent(tty, info->timeout);
|
|
}
|
|
shutdown(info);
|
|
if (tty->driver->flush_buffer)
|
|
tty->driver->flush_buffer(tty);
|
|
|
|
tty_ldisc_flush(tty);
|
|
tty->closing = 0;
|
|
info->event = 0;
|
|
info->tty = NULL;
|
|
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);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* rs_wait_until_sent() --- wait until the transmitter is empty
|
|
*/
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
|
unsigned long orig_jiffies, char_time;
|
|
int lsr;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
|
|
return;
|
|
|
|
if (info->xmit_fifo_size == 0)
|
|
return; /* Just in case.... */
|
|
|
|
orig_jiffies = jiffies;
|
|
/*
|
|
* Set the check interval to be 1/5 of the estimated time to
|
|
* send a single character, and make it at least 1. The check
|
|
* interval should also be less than the timeout.
|
|
*
|
|
* Note: we have to use pretty tight timings here to satisfy
|
|
* the NIST-PCTS.
|
|
*/
|
|
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
|
|
char_time = char_time / 5;
|
|
if (char_time == 0)
|
|
char_time = 1;
|
|
if (timeout)
|
|
char_time = min_t(unsigned long, char_time, timeout);
|
|
/*
|
|
* If the transmitter hasn't cleared in twice the approximate
|
|
* amount of time to send the entire FIFO, it probably won't
|
|
* ever clear. This assumes the UART isn't doing flow
|
|
* control, which is currently the case. Hence, if it ever
|
|
* takes longer than info->timeout, this is probably due to a
|
|
* UART bug of some kind. So, we clamp the timeout parameter at
|
|
* 2*info->timeout.
|
|
*/
|
|
if (!timeout || timeout > 2*info->timeout)
|
|
timeout = 2*info->timeout;
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
|
printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
|
|
printk("jiff=%lu...", jiffies);
|
|
#endif
|
|
while(!((lsr = custom.serdatr) & SDR_TSRE)) {
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
|
printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
|
|
#endif
|
|
msleep_interruptible(jiffies_to_msecs(char_time));
|
|
if (signal_pending(current))
|
|
break;
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
|
break;
|
|
}
|
|
current->state = TASK_RUNNING;
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
|
printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
|
|
*/
|
|
static void rs_hangup(struct tty_struct *tty)
|
|
{
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
|
struct serial_state *state = info->state;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_hangup"))
|
|
return;
|
|
|
|
state = info->state;
|
|
|
|
rs_flush_buffer(tty);
|
|
shutdown(info);
|
|
info->event = 0;
|
|
state->count = 0;
|
|
info->flags &= ~ASYNC_NORMAL_ACTIVE;
|
|
info->tty = NULL;
|
|
wake_up_interruptible(&info->open_wait);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_open() and friends
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static int block_til_ready(struct tty_struct *tty, struct file * filp,
|
|
struct async_struct *info)
|
|
{
|
|
#ifdef DECLARE_WAITQUEUE
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
#else
|
|
struct wait_queue wait = { current, NULL };
|
|
#endif
|
|
struct serial_state *state = info->state;
|
|
int retval;
|
|
int do_clocal = 0, extra_count = 0;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* If the device is in the middle of being closed, then block
|
|
* until it's done, and then try again.
|
|
*/
|
|
if (tty_hung_up_p(filp) ||
|
|
(info->flags & ASYNC_CLOSING)) {
|
|
if (info->flags & ASYNC_CLOSING)
|
|
interruptible_sleep_on(&info->close_wait);
|
|
#ifdef SERIAL_DO_RESTART
|
|
return ((info->flags & ASYNC_HUP_NOTIFY) ?
|
|
-EAGAIN : -ERESTARTSYS);
|
|
#else
|
|
return -EAGAIN;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* If non-blocking mode is set, or the port is not enabled,
|
|
* then make the check up front and then exit.
|
|
*/
|
|
if ((filp->f_flags & O_NONBLOCK) ||
|
|
(tty->flags & (1 << TTY_IO_ERROR))) {
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CLOCAL)
|
|
do_clocal = 1;
|
|
|
|
/*
|
|
* 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, state->count is dropped by one, so that
|
|
* rs_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: ttys%d, count = %d\n",
|
|
state->line, state->count);
|
|
#endif
|
|
local_irq_save(flags);
|
|
if (!tty_hung_up_p(filp)) {
|
|
extra_count = 1;
|
|
state->count--;
|
|
}
|
|
local_irq_restore(flags);
|
|
info->blocked_open++;
|
|
while (1) {
|
|
local_irq_save(flags);
|
|
if (tty->termios->c_cflag & CBAUD)
|
|
rtsdtr_ctrl(SER_DTR|SER_RTS);
|
|
local_irq_restore(flags);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (tty_hung_up_p(filp) ||
|
|
!(info->flags & ASYNC_INITIALIZED)) {
|
|
#ifdef SERIAL_DO_RESTART
|
|
if (info->flags & ASYNC_HUP_NOTIFY)
|
|
retval = -EAGAIN;
|
|
else
|
|
retval = -ERESTARTSYS;
|
|
#else
|
|
retval = -EAGAIN;
|
|
#endif
|
|
break;
|
|
}
|
|
if (!(info->flags & ASYNC_CLOSING) &&
|
|
(do_clocal || (!(ciab.pra & SER_DCD)) ))
|
|
break;
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("block_til_ready blocking: ttys%d, count = %d\n",
|
|
info->line, state->count);
|
|
#endif
|
|
schedule();
|
|
}
|
|
current->state = TASK_RUNNING;
|
|
remove_wait_queue(&info->open_wait, &wait);
|
|
if (extra_count)
|
|
state->count++;
|
|
info->blocked_open--;
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("block_til_ready after blocking: ttys%d, count = %d\n",
|
|
info->line, state->count);
|
|
#endif
|
|
if (retval)
|
|
return retval;
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
static int get_async_struct(int line, struct async_struct **ret_info)
|
|
{
|
|
struct async_struct *info;
|
|
struct serial_state *sstate;
|
|
|
|
sstate = rs_table + line;
|
|
sstate->count++;
|
|
if (sstate->info) {
|
|
*ret_info = sstate->info;
|
|
return 0;
|
|
}
|
|
info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
|
|
if (!info) {
|
|
sstate->count--;
|
|
return -ENOMEM;
|
|
}
|
|
memset(info, 0, sizeof(struct async_struct));
|
|
#ifdef DECLARE_WAITQUEUE
|
|
init_waitqueue_head(&info->open_wait);
|
|
init_waitqueue_head(&info->close_wait);
|
|
init_waitqueue_head(&info->delta_msr_wait);
|
|
#endif
|
|
info->magic = SERIAL_MAGIC;
|
|
info->port = sstate->port;
|
|
info->flags = sstate->flags;
|
|
info->xmit_fifo_size = sstate->xmit_fifo_size;
|
|
info->line = line;
|
|
tasklet_init(&info->tlet, do_softint, (unsigned long)info);
|
|
info->state = sstate;
|
|
if (sstate->info) {
|
|
kfree(info);
|
|
*ret_info = sstate->info;
|
|
return 0;
|
|
}
|
|
*ret_info = sstate->info = info;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This routine is called whenever a serial port is opened. It
|
|
* enables interrupts for a serial port, linking in its async structure into
|
|
* the IRQ chain. It also performs the serial-specific
|
|
* initialization for the tty structure.
|
|
*/
|
|
static int rs_open(struct tty_struct *tty, struct file * filp)
|
|
{
|
|
struct async_struct *info;
|
|
int retval, line;
|
|
|
|
line = tty->index;
|
|
if ((line < 0) || (line >= NR_PORTS)) {
|
|
return -ENODEV;
|
|
}
|
|
retval = get_async_struct(line, &info);
|
|
if (retval) {
|
|
return retval;
|
|
}
|
|
tty->driver_data = info;
|
|
info->tty = tty;
|
|
if (serial_paranoia_check(info, tty->name, "rs_open"))
|
|
return -ENODEV;
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("rs_open %s, count = %d\n", tty->name, info->state->count);
|
|
#endif
|
|
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
|
|
|
|
/*
|
|
* If the port is the middle of closing, bail out now
|
|
*/
|
|
if (tty_hung_up_p(filp) ||
|
|
(info->flags & ASYNC_CLOSING)) {
|
|
if (info->flags & ASYNC_CLOSING)
|
|
interruptible_sleep_on(&info->close_wait);
|
|
#ifdef SERIAL_DO_RESTART
|
|
return ((info->flags & ASYNC_HUP_NOTIFY) ?
|
|
-EAGAIN : -ERESTARTSYS);
|
|
#else
|
|
return -EAGAIN;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 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("rs_open returning after block_til_ready with %d\n",
|
|
retval);
|
|
#endif
|
|
return retval;
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("rs_open %s successful...", tty->name);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* /proc fs routines....
|
|
*/
|
|
|
|
static inline int line_info(char *buf, struct serial_state *state)
|
|
{
|
|
struct async_struct *info = state->info, scr_info;
|
|
char stat_buf[30], control, status;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
|
|
|
|
/*
|
|
* Figure out the current RS-232 lines
|
|
*/
|
|
if (!info) {
|
|
info = &scr_info; /* This is just for serial_{in,out} */
|
|
|
|
info->magic = SERIAL_MAGIC;
|
|
info->flags = state->flags;
|
|
info->quot = 0;
|
|
info->tty = NULL;
|
|
}
|
|
local_irq_save(flags);
|
|
status = ciab.pra;
|
|
control = info ? info->MCR : status;
|
|
local_irq_restore(flags);
|
|
|
|
stat_buf[0] = 0;
|
|
stat_buf[1] = 0;
|
|
if(!(control & SER_RTS))
|
|
strcat(stat_buf, "|RTS");
|
|
if(!(status & SER_CTS))
|
|
strcat(stat_buf, "|CTS");
|
|
if(!(control & SER_DTR))
|
|
strcat(stat_buf, "|DTR");
|
|
if(!(status & SER_DSR))
|
|
strcat(stat_buf, "|DSR");
|
|
if(!(status & SER_DCD))
|
|
strcat(stat_buf, "|CD");
|
|
|
|
if (info->quot) {
|
|
ret += sprintf(buf+ret, " baud:%d",
|
|
state->baud_base / info->quot);
|
|
}
|
|
|
|
ret += sprintf(buf+ret, " tx:%d rx:%d",
|
|
state->icount.tx, state->icount.rx);
|
|
|
|
if (state->icount.frame)
|
|
ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
|
|
|
|
if (state->icount.parity)
|
|
ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
|
|
|
|
if (state->icount.brk)
|
|
ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
|
|
|
|
if (state->icount.overrun)
|
|
ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
|
|
|
|
/*
|
|
* Last thing is the RS-232 status lines
|
|
*/
|
|
ret += sprintf(buf+ret, " %s\n", stat_buf+1);
|
|
return ret;
|
|
}
|
|
|
|
static int rs_read_proc(char *page, char **start, off_t off, int count,
|
|
int *eof, void *data)
|
|
{
|
|
int len = 0, l;
|
|
off_t begin = 0;
|
|
|
|
len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
|
|
l = line_info(page + len, &rs_table[0]);
|
|
len += l;
|
|
if (len+begin > off+count)
|
|
goto done;
|
|
if (len+begin < off) {
|
|
begin += len;
|
|
len = 0;
|
|
}
|
|
*eof = 1;
|
|
done:
|
|
if (off >= len+begin)
|
|
return 0;
|
|
*start = page + (off-begin);
|
|
return ((count < begin+len-off) ? count : begin+len-off);
|
|
}
|
|
|
|
/*
|
|
* ---------------------------------------------------------------------
|
|
* rs_init() and friends
|
|
*
|
|
* rs_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_serial_version(void)
|
|
{
|
|
printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
|
|
}
|
|
|
|
|
|
static const struct tty_operations serial_ops = {
|
|
.open = rs_open,
|
|
.close = rs_close,
|
|
.write = rs_write,
|
|
.put_char = rs_put_char,
|
|
.flush_chars = rs_flush_chars,
|
|
.write_room = rs_write_room,
|
|
.chars_in_buffer = rs_chars_in_buffer,
|
|
.flush_buffer = rs_flush_buffer,
|
|
.ioctl = rs_ioctl,
|
|
.throttle = rs_throttle,
|
|
.unthrottle = rs_unthrottle,
|
|
.set_termios = rs_set_termios,
|
|
.stop = rs_stop,
|
|
.start = rs_start,
|
|
.hangup = rs_hangup,
|
|
.break_ctl = rs_break,
|
|
.send_xchar = rs_send_xchar,
|
|
.wait_until_sent = rs_wait_until_sent,
|
|
.read_proc = rs_read_proc,
|
|
.tiocmget = rs_tiocmget,
|
|
.tiocmset = rs_tiocmset,
|
|
};
|
|
|
|
/*
|
|
* The serial driver boot-time initialization code!
|
|
*/
|
|
static int __init rs_init(void)
|
|
{
|
|
unsigned long flags;
|
|
struct serial_state * state;
|
|
|
|
if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
|
|
return -ENODEV;
|
|
|
|
serial_driver = alloc_tty_driver(1);
|
|
if (!serial_driver)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* We request SERDAT and SERPER only, because the serial registers are
|
|
* too spreaded over the custom register space
|
|
*/
|
|
if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
|
|
return -EBUSY;
|
|
|
|
IRQ_ports = NULL;
|
|
|
|
show_serial_version();
|
|
|
|
/* Initialize the tty_driver structure */
|
|
|
|
serial_driver->owner = THIS_MODULE;
|
|
serial_driver->driver_name = "amiserial";
|
|
serial_driver->name = "ttyS";
|
|
serial_driver->major = TTY_MAJOR;
|
|
serial_driver->minor_start = 64;
|
|
serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
serial_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
serial_driver->init_termios = tty_std_termios;
|
|
serial_driver->init_termios.c_cflag =
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
serial_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(serial_driver, &serial_ops);
|
|
|
|
if (tty_register_driver(serial_driver))
|
|
panic("Couldn't register serial driver\n");
|
|
|
|
state = rs_table;
|
|
state->magic = SSTATE_MAGIC;
|
|
state->port = (int)&custom.serdatr; /* Just to give it a value */
|
|
state->line = 0;
|
|
state->custom_divisor = 0;
|
|
state->close_delay = 5*HZ/10;
|
|
state->closing_wait = 30*HZ;
|
|
state->icount.cts = state->icount.dsr =
|
|
state->icount.rng = state->icount.dcd = 0;
|
|
state->icount.rx = state->icount.tx = 0;
|
|
state->icount.frame = state->icount.parity = 0;
|
|
state->icount.overrun = state->icount.brk = 0;
|
|
|
|
printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
|
|
state->line);
|
|
|
|
/* Hardware set up */
|
|
|
|
state->baud_base = amiga_colorclock;
|
|
state->xmit_fifo_size = 1;
|
|
|
|
local_irq_save(flags);
|
|
|
|
/* set ISRs, and then disable the rx interrupts */
|
|
request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
|
|
request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
|
|
|
|
/* turn off Rx and Tx interrupts */
|
|
custom.intena = IF_RBF | IF_TBE;
|
|
mb();
|
|
|
|
/* clear any pending interrupt */
|
|
custom.intreq = IF_RBF | IF_TBE;
|
|
mb();
|
|
|
|
local_irq_restore(flags);
|
|
|
|
/*
|
|
* set the appropriate directions for the modem control flags,
|
|
* and clear RTS and DTR
|
|
*/
|
|
ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
|
|
ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __exit void rs_exit(void)
|
|
{
|
|
int error;
|
|
struct async_struct *info = rs_table[0].info;
|
|
|
|
/* printk("Unloading %s: version %s\n", serial_name, serial_version); */
|
|
tasklet_kill(&info->tlet);
|
|
if ((error = tty_unregister_driver(serial_driver)))
|
|
printk("SERIAL: failed to unregister serial driver (%d)\n",
|
|
error);
|
|
put_tty_driver(serial_driver);
|
|
|
|
if (info) {
|
|
rs_table[0].info = NULL;
|
|
kfree(info);
|
|
}
|
|
|
|
release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
|
|
}
|
|
|
|
module_init(rs_init)
|
|
module_exit(rs_exit)
|
|
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* Serial console driver
|
|
* ------------------------------------------------------------
|
|
*/
|
|
#ifdef CONFIG_SERIAL_CONSOLE
|
|
|
|
static void amiga_serial_putc(char c)
|
|
{
|
|
custom.serdat = (unsigned char)c | 0x100;
|
|
while (!(custom.serdatr & 0x2000))
|
|
barrier();
|
|
}
|
|
|
|
/*
|
|
* Print a string to the serial port trying not to disturb
|
|
* any possible real use of the port...
|
|
*
|
|
* The console must be locked when we get here.
|
|
*/
|
|
static void serial_console_write(struct console *co, const char *s,
|
|
unsigned count)
|
|
{
|
|
unsigned short intena = custom.intenar;
|
|
|
|
custom.intena = IF_TBE;
|
|
|
|
while (count--) {
|
|
if (*s == '\n')
|
|
amiga_serial_putc('\r');
|
|
amiga_serial_putc(*s++);
|
|
}
|
|
|
|
custom.intena = IF_SETCLR | (intena & IF_TBE);
|
|
}
|
|
|
|
static struct tty_driver *serial_console_device(struct console *c, int *index)
|
|
{
|
|
*index = 0;
|
|
return serial_driver;
|
|
}
|
|
|
|
static struct console sercons = {
|
|
.name = "ttyS",
|
|
.write = serial_console_write,
|
|
.device = serial_console_device,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
};
|
|
|
|
/*
|
|
* Register console.
|
|
*/
|
|
static int __init amiserial_console_init(void)
|
|
{
|
|
register_console(&sercons);
|
|
return 0;
|
|
}
|
|
console_initcall(amiserial_console_init);
|
|
#endif
|
|
|
|
MODULE_LICENSE("GPL");
|