forked from luck/tmp_suning_uos_patched
b7e89214aa
The following patch allows XMON to run on the 4xx platform. Tested on Walnut, Ebony, and Nova (440GX based) eval boards. 440EP, 440SP, and 440SPE boards should work as well. Patch is against 2.6.18-rc6. Signed-off-by: Josh Boyer <jdub@us.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
347 lines
5.6 KiB
C
347 lines
5.6 KiB
C
/*
|
|
* Copyright (C) 1996 Paul Mackerras.
|
|
*/
|
|
#include <linux/string.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/io.h>
|
|
#include <asm/page.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sysrq.h>
|
|
#include <linux/bitops.h>
|
|
#include <asm/xmon.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/delay.h>
|
|
#include <asm/btext.h>
|
|
#include <asm/ibm4xx.h>
|
|
|
|
static volatile unsigned char *sccc, *sccd;
|
|
unsigned int TXRDY, RXRDY, DLAB;
|
|
static int xmon_expect(const char *str, unsigned int timeout);
|
|
|
|
static int via_modem;
|
|
|
|
#define TB_SPEED 25000000
|
|
|
|
static inline unsigned int readtb(void)
|
|
{
|
|
unsigned int ret;
|
|
|
|
asm volatile("mftb %0" : "=r" (ret) :);
|
|
return ret;
|
|
}
|
|
|
|
void buf_access(void)
|
|
{
|
|
if (DLAB)
|
|
sccd[3] &= ~DLAB; /* reset DLAB */
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
static void sysrq_handle_xmon(int key, struct pt_regs *regs,
|
|
struct tty_struct *tty)
|
|
{
|
|
xmon(regs);
|
|
}
|
|
|
|
static struct sysrq_key_op sysrq_xmon_op =
|
|
{
|
|
.handler = sysrq_handle_xmon,
|
|
.help_msg = "Xmon",
|
|
.action_msg = "Entering xmon",
|
|
};
|
|
#endif
|
|
|
|
void
|
|
xmon_map_scc(void)
|
|
{
|
|
#if defined(CONFIG_GEMINI)
|
|
/* should already be mapped by the kernel boot */
|
|
sccd = (volatile unsigned char *) 0xffeffb08;
|
|
#elif defined(CONFIG_405GP)
|
|
sccd = (volatile unsigned char *)0xef600300;
|
|
#elif defined(CONFIG_440EP)
|
|
sccd = (volatile unsigned char *) ioremap(PPC440EP_UART0_ADDR, 8);
|
|
#elif defined(CONFIG_440SP)
|
|
sccd = (volatile unsigned char *) ioremap64(PPC440SP_UART0_ADDR, 8);
|
|
#elif defined(CONFIG_440SPE)
|
|
sccd = (volatile unsigned char *) ioremap64(PPC440SPE_UART0_ADDR, 8);
|
|
#elif defined(CONFIG_44x)
|
|
/* This is the default for 44x platforms. Any boards that have a
|
|
different UART address need to be put in cases before this or the
|
|
port will be mapped incorrectly */
|
|
sccd = (volatile unsigned char *) ioremap64(PPC440GP_UART0_ADDR, 8);
|
|
#endif /* platform */
|
|
|
|
#ifndef CONFIG_PPC_PREP
|
|
sccc = sccd + 5;
|
|
TXRDY = 0x20;
|
|
RXRDY = 1;
|
|
DLAB = 0x80;
|
|
#endif
|
|
|
|
register_sysrq_key('x', &sysrq_xmon_op);
|
|
}
|
|
|
|
static int scc_initialized;
|
|
|
|
void xmon_init_scc(void);
|
|
|
|
int
|
|
xmon_write(void *handle, void *ptr, int nb)
|
|
{
|
|
char *p = ptr;
|
|
int i, c, ct;
|
|
|
|
#ifdef CONFIG_SMP
|
|
static unsigned long xmon_write_lock;
|
|
int lock_wait = 1000000;
|
|
int locked;
|
|
|
|
while ((locked = test_and_set_bit(0, &xmon_write_lock)) != 0)
|
|
if (--lock_wait == 0)
|
|
break;
|
|
#endif
|
|
|
|
if (!scc_initialized)
|
|
xmon_init_scc();
|
|
ct = 0;
|
|
for (i = 0; i < nb; ++i) {
|
|
while ((*sccc & TXRDY) == 0)
|
|
;
|
|
c = p[i];
|
|
if (c == '\n' && !ct) {
|
|
c = '\r';
|
|
ct = 1;
|
|
--i;
|
|
} else {
|
|
ct = 0;
|
|
}
|
|
buf_access();
|
|
*sccd = c;
|
|
eieio();
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
if (!locked)
|
|
clear_bit(0, &xmon_write_lock);
|
|
#endif
|
|
return nb;
|
|
}
|
|
|
|
int xmon_wants_key;
|
|
|
|
|
|
int
|
|
xmon_read(void *handle, void *ptr, int nb)
|
|
{
|
|
char *p = ptr;
|
|
int i;
|
|
|
|
if (!scc_initialized)
|
|
xmon_init_scc();
|
|
for (i = 0; i < nb; ++i) {
|
|
while ((*sccc & RXRDY) == 0)
|
|
;
|
|
buf_access();
|
|
*p++ = *sccd;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
int
|
|
xmon_read_poll(void)
|
|
{
|
|
if ((*sccc & RXRDY) == 0) {
|
|
;
|
|
return -1;
|
|
}
|
|
buf_access();
|
|
return *sccd;
|
|
}
|
|
|
|
void
|
|
xmon_init_scc(void)
|
|
{
|
|
scc_initialized = 1;
|
|
if (via_modem) {
|
|
for (;;) {
|
|
xmon_write(NULL, "ATE1V1\r", 7);
|
|
if (xmon_expect("OK", 5)) {
|
|
xmon_write(NULL, "ATA\r", 4);
|
|
if (xmon_expect("CONNECT", 40))
|
|
break;
|
|
}
|
|
xmon_write(NULL, "+++", 3);
|
|
xmon_expect("OK", 3);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void *xmon_stdin;
|
|
void *xmon_stdout;
|
|
void *xmon_stderr;
|
|
|
|
void
|
|
xmon_init(int arg)
|
|
{
|
|
xmon_map_scc();
|
|
}
|
|
|
|
int
|
|
xmon_putc(int c, void *f)
|
|
{
|
|
char ch = c;
|
|
|
|
if (c == '\n')
|
|
xmon_putc('\r', f);
|
|
return xmon_write(f, &ch, 1) == 1? c: -1;
|
|
}
|
|
|
|
int
|
|
xmon_putchar(int c)
|
|
{
|
|
return xmon_putc(c, xmon_stdout);
|
|
}
|
|
|
|
int
|
|
xmon_fputs(char *str, void *f)
|
|
{
|
|
int n = strlen(str);
|
|
|
|
return xmon_write(f, str, n) == n? 0: -1;
|
|
}
|
|
|
|
int
|
|
xmon_readchar(void)
|
|
{
|
|
char ch;
|
|
|
|
for (;;) {
|
|
switch (xmon_read(xmon_stdin, &ch, 1)) {
|
|
case 1:
|
|
return ch;
|
|
case -1:
|
|
xmon_printf("read(stdin) returned -1\r\n", 0, 0);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static char line[256];
|
|
static char *lineptr;
|
|
static int lineleft;
|
|
|
|
int xmon_expect(const char *str, unsigned int timeout)
|
|
{
|
|
int c;
|
|
unsigned int t0;
|
|
|
|
timeout *= TB_SPEED;
|
|
t0 = readtb();
|
|
do {
|
|
lineptr = line;
|
|
for (;;) {
|
|
c = xmon_read_poll();
|
|
if (c == -1) {
|
|
if (readtb() - t0 > timeout)
|
|
return 0;
|
|
continue;
|
|
}
|
|
if (c == '\n')
|
|
break;
|
|
if (c != '\r' && lineptr < &line[sizeof(line) - 1])
|
|
*lineptr++ = c;
|
|
}
|
|
*lineptr = 0;
|
|
} while (strstr(line, str) == NULL);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
xmon_getchar(void)
|
|
{
|
|
int c;
|
|
|
|
if (lineleft == 0) {
|
|
lineptr = line;
|
|
for (;;) {
|
|
c = xmon_readchar();
|
|
if (c == -1 || c == 4)
|
|
break;
|
|
if (c == '\r' || c == '\n') {
|
|
*lineptr++ = '\n';
|
|
xmon_putchar('\n');
|
|
break;
|
|
}
|
|
switch (c) {
|
|
case 0177:
|
|
case '\b':
|
|
if (lineptr > line) {
|
|
xmon_putchar('\b');
|
|
xmon_putchar(' ');
|
|
xmon_putchar('\b');
|
|
--lineptr;
|
|
}
|
|
break;
|
|
case 'U' & 0x1F:
|
|
while (lineptr > line) {
|
|
xmon_putchar('\b');
|
|
xmon_putchar(' ');
|
|
xmon_putchar('\b');
|
|
--lineptr;
|
|
}
|
|
break;
|
|
default:
|
|
if (lineptr >= &line[sizeof(line) - 1])
|
|
xmon_putchar('\a');
|
|
else {
|
|
xmon_putchar(c);
|
|
*lineptr++ = c;
|
|
}
|
|
}
|
|
}
|
|
lineleft = lineptr - line;
|
|
lineptr = line;
|
|
}
|
|
if (lineleft == 0)
|
|
return -1;
|
|
--lineleft;
|
|
return *lineptr++;
|
|
}
|
|
|
|
char *
|
|
xmon_fgets(char *str, int nb, void *f)
|
|
{
|
|
char *p;
|
|
int c;
|
|
|
|
for (p = str; p < str + nb - 1; ) {
|
|
c = xmon_getchar();
|
|
if (c == -1) {
|
|
if (p == str)
|
|
return NULL;
|
|
break;
|
|
}
|
|
*p++ = c;
|
|
if (c == '\n')
|
|
break;
|
|
}
|
|
*p = 0;
|
|
return str;
|
|
}
|
|
|
|
void
|
|
xmon_enter(void)
|
|
{
|
|
}
|
|
|
|
void
|
|
xmon_leave(void)
|
|
{
|
|
}
|