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-rw-r--r--arch/ppc/xmon/start.c646
1 files changed, 646 insertions, 0 deletions
diff --git a/arch/ppc/xmon/start.c b/arch/ppc/xmon/start.c
new file mode 100644
index 000000000000..507d4eeffe07
--- /dev/null
+++ b/arch/ppc/xmon/start.c
@@ -0,0 +1,646 @@
+/*
+ * 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;
+
+ } 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;
+ }
+#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(void)
+{
+}
+
+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
+}
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