/*
* Copyright (C) 1996 Paul Mackerras.
*/
#include <linux/config.h>
#include <linux/string.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/page.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/cuda.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/sysrq.h>
#include <linux/bitops.h>
#include <asm/xmon.h>
#include <asm/prom.h>
#include <asm/bootx.h>
#include <asm/machdep.h>
#include <asm/errno.h>
#include <asm/pmac_feature.h>
#include <asm/processor.h>
#include <asm/delay.h>
#include <asm/btext.h>
static volatile unsigned char *sccc, *sccd;
unsigned int TXRDY, RXRDY, DLAB;
static int xmon_expect(const char *str, unsigned int timeout);
static int use_serial;
static int use_screen;
static int via_modem;
static int xmon_use_sccb;
static struct device_node *channel_node;
#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 */
}
extern int adb_init(void);
#ifdef CONFIG_PPC_CHRP
/*
* This looks in the "ranges" property for the primary PCI host bridge
* to find the physical address of the start of PCI/ISA I/O space.
* It is basically a cut-down version of pci_process_bridge_OF_ranges.
*/
static unsigned long chrp_find_phys_io_base(void)
{
struct device_node *node;
unsigned int *ranges;
unsigned long base = CHRP_ISA_IO_BASE;
int rlen = 0;
int np;
node = find_devices("isa");
if (node != NULL) {
node = node->parent;
if (node == NULL || node->type == NULL
|| strcmp(node->type, "pci") != 0)
node = NULL;
}
if (node == NULL)
node = find_devices("pci");
if (node == NULL)
return base;
ranges = (unsigned int *) get_property(node, "ranges", &rlen);
np = prom_n_addr_cells(node) + 5;
while ((rlen -= np * sizeof(unsigned int)) >= 0) {
if ((ranges[0] >> 24) == 1 && ranges[2] == 0) {
/* I/O space starting at 0, grab the phys base */
base = ranges[np - 3];
break;
}
ranges += np;
}
return base;
}
#endif /* CONFIG_PPC_CHRP */
#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)
{
#ifdef CONFIG_PPC_MULTIPLATFORM
volatile unsigned char *base;
if (_machine == _MACH_Pmac) {
struct device_node *np;
unsigned long addr;
#ifdef CONFIG_BOOTX_TEXT
if (!use_screen && !use_serial
&& !machine_is_compatible("iMac")) {
/* see if there is a keyboard in the device tree
with a parent of type "adb" */
for (np = find_devices("keyboard"); np; np = np->next)
if (np->parent && np->parent->type
&& strcmp(np->parent->type, "adb") == 0)
break;
/* needs to be hacked if xmon_printk is to be used
from within find_via_pmu() */
#ifdef CONFIG_ADB_PMU
if (np != NULL && boot_text_mapped && find_via_pmu())
use_screen = 1;
#endif
#ifdef CONFIG_ADB_CUDA
if (np != NULL && boot_text_mapped && find_via_cuda())
use_screen = 1;
#endif
}
if (!use_screen && (np = find_devices("escc")) != NULL) {
/*
* look for the device node for the serial port
* we're using and see if it says it has a modem
*/
char *name = xmon_use_sccb? "ch-b": "ch-a";
char *slots;
int l;
np = np->child;
while (np != NULL && strcmp(np->name, name) != 0)
np = np->sibling;
if (np != NULL) {
/* XXX should parse this properly */
channel_node = np;
slots = get_property(np, "slot-names", &l);
if (slots != NULL && l >= 10
&& strcmp(slots+4, "Modem") == 0)
via_modem = 1;
}
}
btext_drawstring("xmon uses ");
if (use_screen)
btext_drawstring("screen and keyboard\n");
else {
if (via_modem)
btext_drawstring("modem on ");
btext_drawstring(xmon_use_sccb? "printer": "modem");
btext_drawstring(" port\n");
}
#endif /* CONFIG_BOOTX_TEXT */
#ifdef CHRP_ESCC
addr = 0xc1013020;
#else
addr = 0xf3013020;
#endif
TXRDY = 4;
RXRDY = 1;
np = find_devices("mac-io");
if (np && np->n_addrs)
addr = np->addrs[0].address + 0x13020;
base = (volatile unsigned char *) ioremap(addr & PAGE_MASK, PAGE_SIZE);
sccc = base + (addr & ~PAGE_MASK);
sccd = sccc + 0x10;
}
#ifdef CONFIG_PPC_CHRP
else {
base = (volatile unsigned char *) isa_io_base;
if (_machine == _MACH_chrp)
base = (volatile unsigned char *)
ioremap(chrp_find_phys_io_base(), 0x1000);
sccc = base + 0x3fd;
sccd = base + 0x3f8;
if (xmon_use_sccb) {
sccc -= 0x100;
sccd -= 0x100;
}
TXRDY = 0x20;
RXRDY = 1;
DLAB = 0x80;
}
#endif /* CONFIG_PPC_CHRP */
#elif defined(CONFIG_GEMINI)
/* should already be mapped by the kernel boot */
sccc = (volatile unsigned char *) 0xffeffb0d;
sccd = (volatile unsigned char *) 0xffeffb08;
TXRDY = 0x20;
RXRDY = 1;
DLAB = 0x80;
#elif defined(CONFIG_405GP)
sccc = (volatile unsigned char *)0xef600305;
sccd = (volatile unsigned char *)0xef600300;
TXRDY = 0x20;
RXRDY = 1;
DLAB = 0x80;
#endif /* platform */
register_sysrq_key('x', &sysrq_xmon_op);
}
static int scc_initialized = 0;
void xmon_init_scc(void);
extern void cuda_poll(void);
static inline void do_poll_adb(void)
{
#ifdef CONFIG_ADB_PMU
if (sys_ctrler == SYS_CTRLER_PMU)
pmu_poll_adb();
#endif /* CONFIG_ADB_PMU */
#ifdef CONFIG_ADB_CUDA
if (sys_ctrler == SYS_CTRLER_CUDA)
cuda_poll();
#endif /* CONFIG_ADB_CUDA */
}
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
#ifdef CONFIG_BOOTX_TEXT
if (use_screen) {
/* write it on the screen */
for (i = 0; i < nb; ++i)
btext_drawchar(*p++);
goto out;
}
#endif
if (!scc_initialized)
xmon_init_scc();
ct = 0;
for (i = 0; i < nb; ++i) {
while ((*sccc & TXRDY) == 0)
do_poll_adb();
c = p[i];
if (c == '\n' && !ct) {
c = '\r';
ct = 1;
--i;
} else {
ct = 0;
}
buf_access();
*sccd = c;
eieio();
}
out:
#ifdef CONFIG_SMP
if (!locked)
clear_bit(0, &xmon_write_lock);
#endif
return nb;
}
int xmon_wants_key;
int xmon_adb_keycode;
#ifdef CONFIG_BOOTX_TEXT
static int xmon_adb_shiftstate;
static unsigned char xmon_keytab[128] =
"asdfhgzxcv\000bqwer" /* 0x00 - 0x0f */
"yt123465=97-80]o" /* 0x10 - 0x1f */
"u[ip\rlj'k;\\,/nm." /* 0x20 - 0x2f */
"\t `\177\0\033\0\0\0\0\0\0\0\0\0\0" /* 0x30 - 0x3f */
"\0.\0*\0+\0\0\0\0\0/\r\0-\0" /* 0x40 - 0x4f */
"\0\0000123456789\0\0\0"; /* 0x50 - 0x5f */
static unsigned char xmon_shift_keytab[128] =
"ASDFHGZXCV\000BQWER" /* 0x00 - 0x0f */
"YT!@#$^%+(&_*)}O" /* 0x10 - 0x1f */
"U{IP\rLJ\"K:|<?NM>" /* 0x20 - 0x2f */
"\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0" /* 0x30 - 0x3f */
"\0.\0*\0+\0\0\0\0\0/\r\0-\0" /* 0x40 - 0x4f */
"\0\0000123456789\0\0\0"; /* 0x50 - 0x5f */
static int
xmon_get_adb_key(void)
{
int k, t, on;
xmon_wants_key = 1;
for (;;) {
xmon_adb_keycode = -1;
t = 0;
on = 0;
do {
if (--t < 0) {
on = 1 - on;
btext_drawchar(on? 0xdb: 0x20);
btext_drawchar('\b');
t = 200000;
}
do_poll_adb();
} while (xmon_adb_keycode == -1);
k = xmon_adb_keycode;
if (on)
btext_drawstring(" \b");
/* test for shift keys */
if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) {
xmon_adb_shiftstate = (k & 0x80) == 0;
continue;
}
if (k >= 0x80)
continue; /* ignore up transitions */
k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k];
if (k != 0)
break;
}
xmon_wants_key = 0;
return k;
}
#endif /* CONFIG_BOOTX_TEXT */
int
xmon_read(void *handle, void *ptr, int nb)
{
char *p = ptr;
int i;
#ifdef CONFIG_BOOTX_TEXT
if (use_screen) {
for (i = 0; i < nb; ++i)
*p++ = xmon_get_adb_key();
return i;
}
#endif
if (!scc_initialized)
xmon_init_scc();
for (i = 0; i < nb; ++i) {
while ((*sccc & RXRDY) == 0)
do_poll_adb();
buf_access();
*p++ = *sccd;
}
return i;
}
int
xmon_read_poll(void)
{
if ((*sccc & RXRDY) == 0) {
do_poll_adb();
return -1;
}
buf_access();
return *sccd;
}
static unsigned char scc_inittab[] = {
13, 0, /* set baud rate divisor */
12, 1,
14, 1, /* baud rate gen enable, src=rtxc */
11, 0x50, /* clocks = br gen */
5, 0xea, /* tx 8 bits, assert DTR & RTS */
4, 0x46, /* x16 clock, 1 stop */
3, 0xc1, /* rx enable, 8 bits */
};
void
xmon_init_scc(void)
{
if ( _machine == _MACH_chrp )
{
sccd[3] = 0x83; eieio(); /* LCR = 8N1 + DLAB */
sccd[0] = 12; eieio(); /* DLL = 9600 baud */
sccd[1] = 0; eieio();
sccd[2] = 0; eieio(); /* FCR = 0 */
sccd[3] = 3; eieio(); /* LCR = 8N1 */
sccd[1] = 0; eieio(); /* IER = 0 */
}
else if ( _machine == _MACH_Pmac )
{
int i, x;
if (channel_node != 0)
pmac_call_feature(
PMAC_FTR_SCC_ENABLE,
channel_node,
PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1);
printk(KERN_INFO "Serial port locked ON by debugger !\n");
if (via_modem && channel_node != 0) {
unsigned int t0;
pmac_call_feature(
PMAC_FTR_MODEM_ENABLE,
channel_node, 0, 1);
printk(KERN_INFO "Modem powered up by debugger !\n");
t0 = readtb();
while (readtb() - t0 < 3*TB_SPEED)
eieio();
}
/* use the B channel if requested */
if (xmon_use_sccb) {
sccc = (volatile unsigned char *)
((unsigned long)sccc & ~0x20);
sccd = sccc + 0x10;
}
for (i = 20000; i != 0; --i) {
x = *sccc; eieio();
}
*sccc = 9; eieio(); /* reset A or B side */
*sccc = ((unsigned long)sccc & 0x20)? 0x80: 0x40; eieio();
for (i = 0; i < sizeof(scc_inittab); ++i) {
*sccc = scc_inittab[i];
eieio();
}
}
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);
}
}
}
#if 0
extern int (*prom_entry)(void *);
int
xmon_exit(void)
{
struct prom_args {
char *service;
} args;
for (;;) {
args.service = "exit";
(*prom_entry)(&args);
}
}
#endif
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)
{
#ifdef CONFIG_ADB_PMU
if (_machine == _MACH_Pmac) {
pmu_suspend();
}
#endif
}
void
xmon_leave(void)
{
#ifdef CONFIG_ADB_PMU
if (_machine == _MACH_Pmac) {
pmu_resume();
}
#endif
}
