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linux-sg2042/arch/m68k/mac/debug.c

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/*
* linux/arch/m68k/mac/debug.c
*
* Shamelessly stolen (SCC code and general framework) from:
*
* linux/arch/m68k/atari/debug.c
*
* Atari debugging and serial console stuff
*
* Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/delay.h>
#define BOOTINFO_COMPAT_1_0
#include <asm/setup.h>
#include <asm/bootinfo.h>
#include <asm/macints.h>
extern unsigned long mac_videobase;
extern unsigned long mac_rowbytes;
extern void mac_serial_print(const char *);
#define DEBUG_HEADS
#undef DEBUG_SCREEN
#define DEBUG_SERIAL
/*
* These two auxiliary debug functions should go away ASAP. Only usage:
* before the console output is up (after head.S come some other crucial
* setup routines :-) it permits writing 'data' to the screen as bit patterns
* (good luck reading those). Helped to figure that the bootinfo contained
* garbage data on the amount and size of memory chunks ...
*
* The 'pos' argument now simply means 'linefeed after print' ...
*/
#ifdef DEBUG_SCREEN
static int peng, line;
#endif
#if 0
void mac_debugging_short(int pos, short num)
{
#ifdef DEBUG_SCREEN
unsigned char *pengoffset;
unsigned char *pptr;
int i;
#endif
#ifdef DEBUG_SERIAL
printk("debug: %d !\n", num);
#endif
#ifdef DEBUG_SCREEN
if (!MACH_IS_MAC) {
/* printk("debug: %d !\n", num); */
return;
}
/* calculate current offset */
pengoffset = (unsigned char *)mac_videobase +
(150+line*2) * mac_rowbytes + 80 * peng;
pptr = pengoffset;
for (i = 0; i < 8 * sizeof(short); i++) { /* # of bits */
/* value mask for bit i, reverse order */
*pptr++ = (num & (1 << (8*sizeof(short)-i-1)) ? 0xFF : 0x00);
}
peng++;
if (pos) {
line++;
peng = 0;
}
#endif
}
void mac_debugging_long(int pos, long addr)
{
#ifdef DEBUG_SCREEN
unsigned char *pengoffset;
unsigned char *pptr;
int i;
#endif
#ifdef DEBUG_SERIAL
printk("debug: #%ld !\n", addr);
#endif
#ifdef DEBUG_SCREEN
if (!MACH_IS_MAC) {
/* printk("debug: #%ld !\n", addr); */
return;
}
pengoffset=(unsigned char *)(mac_videobase+(150+line*2)*mac_rowbytes)
+80*peng;
pptr = pengoffset;
for (i = 0; i < 8 * sizeof(long); i++) { /* # of bits */
*pptr++ = (addr & (1 << (8*sizeof(long)-i-1)) ? 0xFF : 0x00);
}
peng++;
if (pos) {
line++;
peng = 0;
}
#endif
}
#endif /* 0 */
#ifdef DEBUG_SERIAL
/*
* TODO: serial debug code
*/
struct mac_SCC {
u_char cha_b_ctrl;
u_char char_dummy1;
u_char cha_a_ctrl;
u_char char_dummy2;
u_char cha_b_data;
u_char char_dummy3;
u_char cha_a_data;
};
# define scc (*((volatile struct mac_SCC*)mac_bi_data.sccbase))
static int scc_port = -1;
static struct console mac_console_driver = {
.name = "debug",
.flags = CON_PRINTBUFFER,
.index = -1,
};
/*
* Crude hack to get console output to the screen before the framebuffer
* is initialized (happens a lot later in 2.1!).
* We just use the console routines declared in head.S, this will interfere
* with regular framebuffer console output and should be used exclusively
* to debug kernel problems manifesting before framebuffer init (aka WSOD)
*
* To keep this hack from interfering with the regular console driver, either
* deregister this driver before/on framebuffer console init, or silence this
* function after the fbcon driver is running (will lose console messages!?).
* To debug real early bugs, need to write a 'mac_register_console_hack()'
* that is called from start_kernel() before setup_arch() and just registers
* this driver if Mac.
*/
static void mac_debug_console_write(struct console *co, const char *str,
unsigned int count)
{
mac_serial_print(str);
}
/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
#define uSEC 1
static inline void mac_sccb_out(char c)
{
int i;
do {
for (i = uSEC; i > 0; --i)
barrier();
} while (!(scc.cha_b_ctrl & 0x04)); /* wait for tx buf empty */
for (i = uSEC; i > 0; --i)
barrier();
scc.cha_b_data = c;
}
static inline void mac_scca_out(char c)
{
int i;
do {
for (i = uSEC; i > 0; --i)
barrier();
} while (!(scc.cha_a_ctrl & 0x04)); /* wait for tx buf empty */
for (i = uSEC; i > 0; --i)
barrier();
scc.cha_a_data = c;
}
static void mac_sccb_console_write(struct console *co, const char *str,
unsigned int count)
{
while (count--) {
if (*str == '\n')
mac_sccb_out('\r');
mac_sccb_out(*str++);
}
}
static void mac_scca_console_write(struct console *co, const char *str,
unsigned int count)
{
while (count--) {
if (*str == '\n')
mac_scca_out('\r');
mac_scca_out(*str++);
}
}
/* The following two functions do a quick'n'dirty initialization of the MFP or
* SCC serial ports. They're used by the debugging interface, kgdb, and the
* serial console code. */
#define SCCB_WRITE(reg,val) \
do { \
int i; \
scc.cha_b_ctrl = (reg); \
for (i = uSEC; i > 0; --i) \
barrier(); \
scc.cha_b_ctrl = (val); \
for (i = uSEC; i > 0; --i) \
barrier(); \
} while(0)
#define SCCA_WRITE(reg,val) \
do { \
int i; \
scc.cha_a_ctrl = (reg); \
for (i = uSEC; i > 0; --i) \
barrier(); \
scc.cha_a_ctrl = (val); \
for (i = uSEC; i > 0; --i) \
barrier(); \
} while(0)
/* loops_per_jiffy isn't initialized yet, so we can't use udelay(). This does a
* delay of ~ 60us. */
/* Mac: loops_per_jiffy min. 19000 ^= .5 us; MFPDELAY was 0.6 us*/
#define LONG_DELAY() \
do { \
int i; \
for (i = 60*uSEC; i > 0; --i) \
barrier(); \
} while(0)
static void __init mac_init_scc_port(int cflag, int port)
{
/*
* baud rates: 1200, 1800, 2400, 4800, 9600, 19.2k, 38.4k, 57.6k, 115.2k
*/
static int clksrc_table[9] =
/* reg 11: 0x50 = BRG, 0x00 = RTxC, 0x28 = TRxC */
{ 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00, 0x00 };
static int clkmode_table[9] =
/* reg 4: 0x40 = x16, 0x80 = x32, 0xc0 = x64 */
{ 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0xc0, 0x80 };
static int div_table[9] =
/* reg12 (BRG low) */
{ 94, 62, 46, 22, 10, 4, 1, 0, 0 };
int baud = cflag & CBAUD;
int clksrc, clkmode, div, reg3, reg5;
if (cflag & CBAUDEX)
baud += B38400;
if (baud < B1200 || baud > B38400+2)
baud = B9600; /* use default 9600bps for non-implemented rates */
baud -= B1200; /* tables starts at 1200bps */
clksrc = clksrc_table[baud];
clkmode = clkmode_table[baud];
div = div_table[baud];
reg3 = (((cflag & CSIZE) == CS8) ? 0xc0 : 0x40);
reg5 = (((cflag & CSIZE) == CS8) ? 0x60 : 0x20) | 0x82 /* assert DTR/RTS */;
if (port == 1) {
(void)scc.cha_b_ctrl; /* reset reg pointer */
SCCB_WRITE(9, 0xc0); /* reset */
LONG_DELAY(); /* extra delay after WR9 access */
SCCB_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
0x04 /* 1 stopbit */ |
clkmode);
SCCB_WRITE(3, reg3);
SCCB_WRITE(5, reg5);
SCCB_WRITE(9, 0); /* no interrupts */
LONG_DELAY(); /* extra delay after WR9 access */
SCCB_WRITE(10, 0); /* NRZ mode */
SCCB_WRITE(11, clksrc); /* main clock source */
SCCB_WRITE(12, div); /* BRG value */
SCCB_WRITE(13, 0); /* BRG high byte */
SCCB_WRITE(14, 1);
SCCB_WRITE(3, reg3 | 1);
SCCB_WRITE(5, reg5 | 8);
} else if (port == 0) {
(void)scc.cha_a_ctrl; /* reset reg pointer */
SCCA_WRITE(9, 0xc0); /* reset */
LONG_DELAY(); /* extra delay after WR9 access */
SCCA_WRITE(4, (cflag & PARENB) ? ((cflag & PARODD) ? 0x01 : 0x03) : 0 |
0x04 /* 1 stopbit */ |
clkmode);
SCCA_WRITE(3, reg3);
SCCA_WRITE(5, reg5);
SCCA_WRITE(9, 0); /* no interrupts */
LONG_DELAY(); /* extra delay after WR9 access */
SCCA_WRITE(10, 0); /* NRZ mode */
SCCA_WRITE(11, clksrc); /* main clock source */
SCCA_WRITE(12, div); /* BRG value */
SCCA_WRITE(13, 0); /* BRG high byte */
SCCA_WRITE(14, 1);
SCCA_WRITE(3, reg3 | 1);
SCCA_WRITE(5, reg5 | 8);
}
}
#endif /* DEBUG_SERIAL */
static int __init mac_debug_setup(char *arg)
{
if (!MACH_IS_MAC)
return 0;
#ifdef DEBUG_SERIAL
if (!strcmp(arg, "ser") || !strcmp(arg, "ser1")) {
/* Mac modem port */
mac_init_scc_port(B9600|CS8, 0);
mac_console_driver.write = mac_scca_console_write;
scc_port = 0;
} else if (!strcmp(arg, "ser2")) {
/* Mac printer port */
mac_init_scc_port(B9600|CS8, 1);
mac_console_driver.write = mac_sccb_console_write;
scc_port = 1;
}
#endif
#ifdef DEBUG_HEADS
if (!strcmp(arg, "scn") || !strcmp(arg, "con")) {
/* display, using head.S console routines */
mac_console_driver.write = mac_debug_console_write;
}
#endif
if (mac_console_driver.write)
register_console(&mac_console_driver);
return 0;
}
early_param("debug", mac_debug_setup);
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