651 lines
13 KiB
C
651 lines
13 KiB
C
/*
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* Copyright (C) 1996 Paul Mackerras.
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*/
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#include <linux/config.h>
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#include <linux/string.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#include <asm/page.h>
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#include <linux/adb.h>
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#include <linux/pmu.h>
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#include <linux/cuda.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/sysrq.h>
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#include <linux/bitops.h>
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#include <asm/xmon.h>
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#include <asm/prom.h>
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#include <asm/bootx.h>
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#include <asm/machdep.h>
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#include <asm/errno.h>
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#include <asm/pmac_feature.h>
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#include <asm/processor.h>
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#include <asm/delay.h>
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#include <asm/btext.h>
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static volatile unsigned char *sccc, *sccd;
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unsigned int TXRDY, RXRDY, DLAB;
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static int xmon_expect(const char *str, unsigned int timeout);
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static int use_serial;
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static int use_screen;
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static int via_modem;
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static int xmon_use_sccb;
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static struct device_node *channel_node;
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#define TB_SPEED 25000000
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static inline unsigned int readtb(void)
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{
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unsigned int ret;
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asm volatile("mftb %0" : "=r" (ret) :);
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return ret;
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}
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void buf_access(void)
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{
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if (DLAB)
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sccd[3] &= ~DLAB; /* reset DLAB */
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}
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extern int adb_init(void);
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#ifdef CONFIG_PPC_CHRP
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/*
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* This looks in the "ranges" property for the primary PCI host bridge
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* to find the physical address of the start of PCI/ISA I/O space.
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* It is basically a cut-down version of pci_process_bridge_OF_ranges.
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*/
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static unsigned long chrp_find_phys_io_base(void)
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{
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struct device_node *node;
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unsigned int *ranges;
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unsigned long base = CHRP_ISA_IO_BASE;
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int rlen = 0;
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int np;
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node = find_devices("isa");
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if (node != NULL) {
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node = node->parent;
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if (node == NULL || node->type == NULL
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|| strcmp(node->type, "pci") != 0)
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node = NULL;
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}
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if (node == NULL)
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node = find_devices("pci");
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if (node == NULL)
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return base;
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ranges = (unsigned int *) get_property(node, "ranges", &rlen);
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np = prom_n_addr_cells(node) + 5;
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while ((rlen -= np * sizeof(unsigned int)) >= 0) {
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if ((ranges[0] >> 24) == 1 && ranges[2] == 0) {
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/* I/O space starting at 0, grab the phys base */
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base = ranges[np - 3];
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break;
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}
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ranges += np;
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}
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return base;
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}
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#endif /* CONFIG_PPC_CHRP */
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#ifdef CONFIG_MAGIC_SYSRQ
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static void sysrq_handle_xmon(int key, struct pt_regs *regs,
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struct tty_struct *tty)
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{
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xmon(regs);
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}
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static struct sysrq_key_op sysrq_xmon_op =
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{
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.handler = sysrq_handle_xmon,
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.help_msg = "Xmon",
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.action_msg = "Entering xmon",
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};
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#endif
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void
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xmon_map_scc(void)
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{
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#ifdef CONFIG_PPC_MULTIPLATFORM
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volatile unsigned char *base;
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if (_machine == _MACH_Pmac) {
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struct device_node *np;
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unsigned long addr;
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#ifdef CONFIG_BOOTX_TEXT
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if (!use_screen && !use_serial
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&& !machine_is_compatible("iMac")) {
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/* see if there is a keyboard in the device tree
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with a parent of type "adb" */
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for (np = find_devices("keyboard"); np; np = np->next)
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if (np->parent && np->parent->type
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&& strcmp(np->parent->type, "adb") == 0)
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break;
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/* needs to be hacked if xmon_printk is to be used
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from within find_via_pmu() */
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#ifdef CONFIG_ADB_PMU
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if (np != NULL && boot_text_mapped && find_via_pmu())
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use_screen = 1;
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#endif
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#ifdef CONFIG_ADB_CUDA
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if (np != NULL && boot_text_mapped && find_via_cuda())
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use_screen = 1;
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#endif
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}
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if (!use_screen && (np = find_devices("escc")) != NULL) {
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/*
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* look for the device node for the serial port
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* we're using and see if it says it has a modem
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*/
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char *name = xmon_use_sccb? "ch-b": "ch-a";
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char *slots;
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int l;
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np = np->child;
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while (np != NULL && strcmp(np->name, name) != 0)
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np = np->sibling;
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if (np != NULL) {
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/* XXX should parse this properly */
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channel_node = np;
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slots = get_property(np, "slot-names", &l);
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if (slots != NULL && l >= 10
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&& strcmp(slots+4, "Modem") == 0)
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via_modem = 1;
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}
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}
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btext_drawstring("xmon uses ");
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if (use_screen)
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btext_drawstring("screen and keyboard\n");
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else {
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if (via_modem)
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btext_drawstring("modem on ");
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btext_drawstring(xmon_use_sccb? "printer": "modem");
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btext_drawstring(" port\n");
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}
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#endif /* CONFIG_BOOTX_TEXT */
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#ifdef CHRP_ESCC
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addr = 0xc1013020;
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#else
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addr = 0xf3013020;
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#endif
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TXRDY = 4;
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RXRDY = 1;
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np = find_devices("mac-io");
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if (np && np->n_addrs)
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addr = np->addrs[0].address + 0x13020;
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base = (volatile unsigned char *) ioremap(addr & PAGE_MASK, PAGE_SIZE);
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sccc = base + (addr & ~PAGE_MASK);
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sccd = sccc + 0x10;
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}
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#ifdef CONFIG_PPC_CHRP
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else {
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base = (volatile unsigned char *) isa_io_base;
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if (_machine == _MACH_chrp)
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base = (volatile unsigned char *)
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ioremap(chrp_find_phys_io_base(), 0x1000);
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sccc = base + 0x3fd;
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sccd = base + 0x3f8;
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if (xmon_use_sccb) {
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sccc -= 0x100;
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sccd -= 0x100;
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}
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TXRDY = 0x20;
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RXRDY = 1;
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DLAB = 0x80;
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}
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#endif /* CONFIG_PPC_CHRP */
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#elif defined(CONFIG_GEMINI)
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/* should already be mapped by the kernel boot */
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sccc = (volatile unsigned char *) 0xffeffb0d;
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sccd = (volatile unsigned char *) 0xffeffb08;
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TXRDY = 0x20;
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RXRDY = 1;
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DLAB = 0x80;
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#elif defined(CONFIG_405GP)
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sccc = (volatile unsigned char *)0xef600305;
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sccd = (volatile unsigned char *)0xef600300;
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TXRDY = 0x20;
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RXRDY = 1;
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DLAB = 0x80;
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#endif /* platform */
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register_sysrq_key('x', &sysrq_xmon_op);
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}
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static int scc_initialized = 0;
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void xmon_init_scc(void);
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extern void cuda_poll(void);
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static inline void do_poll_adb(void)
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{
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#ifdef CONFIG_ADB_PMU
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if (sys_ctrler == SYS_CTRLER_PMU)
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pmu_poll_adb();
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#endif /* CONFIG_ADB_PMU */
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#ifdef CONFIG_ADB_CUDA
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if (sys_ctrler == SYS_CTRLER_CUDA)
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cuda_poll();
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#endif /* CONFIG_ADB_CUDA */
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}
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int
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xmon_write(void *handle, void *ptr, int nb)
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{
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char *p = ptr;
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int i, c, ct;
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#ifdef CONFIG_SMP
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static unsigned long xmon_write_lock;
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int lock_wait = 1000000;
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int locked;
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while ((locked = test_and_set_bit(0, &xmon_write_lock)) != 0)
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if (--lock_wait == 0)
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break;
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#endif
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#ifdef CONFIG_BOOTX_TEXT
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if (use_screen) {
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/* write it on the screen */
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for (i = 0; i < nb; ++i)
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btext_drawchar(*p++);
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goto out;
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}
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#endif
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if (!scc_initialized)
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xmon_init_scc();
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ct = 0;
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for (i = 0; i < nb; ++i) {
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while ((*sccc & TXRDY) == 0)
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do_poll_adb();
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c = p[i];
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if (c == '\n' && !ct) {
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c = '\r';
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ct = 1;
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--i;
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} else {
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ct = 0;
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}
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buf_access();
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*sccd = c;
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eieio();
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}
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out:
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#ifdef CONFIG_SMP
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if (!locked)
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clear_bit(0, &xmon_write_lock);
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#endif
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return nb;
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}
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int xmon_wants_key;
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int xmon_adb_keycode;
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#ifdef CONFIG_BOOTX_TEXT
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static int xmon_adb_shiftstate;
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static unsigned char xmon_keytab[128] =
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"asdfhgzxcv\000bqwer" /* 0x00 - 0x0f */
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"yt123465=97-80]o" /* 0x10 - 0x1f */
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"u[ip\rlj'k;\\,/nm." /* 0x20 - 0x2f */
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"\t `\177\0\033\0\0\0\0\0\0\0\0\0\0" /* 0x30 - 0x3f */
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"\0.\0*\0+\0\0\0\0\0/\r\0-\0" /* 0x40 - 0x4f */
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"\0\0000123456789\0\0\0"; /* 0x50 - 0x5f */
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static unsigned char xmon_shift_keytab[128] =
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"ASDFHGZXCV\000BQWER" /* 0x00 - 0x0f */
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"YT!@#$^%+(&_*)}O" /* 0x10 - 0x1f */
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"U{IP\rLJ\"K:|<?NM>" /* 0x20 - 0x2f */
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"\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0" /* 0x30 - 0x3f */
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"\0.\0*\0+\0\0\0\0\0/\r\0-\0" /* 0x40 - 0x4f */
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"\0\0000123456789\0\0\0"; /* 0x50 - 0x5f */
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static int
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xmon_get_adb_key(void)
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{
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int k, t, on;
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xmon_wants_key = 1;
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for (;;) {
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xmon_adb_keycode = -1;
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t = 0;
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on = 0;
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do {
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if (--t < 0) {
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on = 1 - on;
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btext_drawchar(on? 0xdb: 0x20);
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btext_drawchar('\b');
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t = 200000;
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}
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do_poll_adb();
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} while (xmon_adb_keycode == -1);
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k = xmon_adb_keycode;
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if (on)
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btext_drawstring(" \b");
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/* test for shift keys */
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if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) {
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xmon_adb_shiftstate = (k & 0x80) == 0;
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continue;
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}
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if (k >= 0x80)
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continue; /* ignore up transitions */
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k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k];
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if (k != 0)
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break;
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}
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xmon_wants_key = 0;
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return k;
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}
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#endif /* CONFIG_BOOTX_TEXT */
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int
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xmon_read(void *handle, void *ptr, int nb)
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{
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char *p = ptr;
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int i;
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#ifdef CONFIG_BOOTX_TEXT
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if (use_screen) {
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for (i = 0; i < nb; ++i)
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*p++ = xmon_get_adb_key();
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return i;
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}
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#endif
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if (!scc_initialized)
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xmon_init_scc();
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for (i = 0; i < nb; ++i) {
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while ((*sccc & RXRDY) == 0)
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do_poll_adb();
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buf_access();
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*p++ = *sccd;
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}
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return i;
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}
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int
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xmon_read_poll(void)
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{
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if ((*sccc & RXRDY) == 0) {
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do_poll_adb();
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return -1;
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}
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buf_access();
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return *sccd;
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}
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static unsigned char scc_inittab[] = {
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13, 0, /* set baud rate divisor */
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12, 1,
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14, 1, /* baud rate gen enable, src=rtxc */
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11, 0x50, /* clocks = br gen */
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5, 0xea, /* tx 8 bits, assert DTR & RTS */
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4, 0x46, /* x16 clock, 1 stop */
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3, 0xc1, /* rx enable, 8 bits */
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};
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void
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xmon_init_scc(void)
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{
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if ( _machine == _MACH_chrp )
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{
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sccd[3] = 0x83; eieio(); /* LCR = 8N1 + DLAB */
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sccd[0] = 12; eieio(); /* DLL = 9600 baud */
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sccd[1] = 0; eieio();
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sccd[2] = 0; eieio(); /* FCR = 0 */
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sccd[3] = 3; eieio(); /* LCR = 8N1 */
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sccd[1] = 0; eieio(); /* IER = 0 */
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}
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else if ( _machine == _MACH_Pmac )
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{
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int i, x;
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if (channel_node != 0)
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pmac_call_feature(
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PMAC_FTR_SCC_ENABLE,
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channel_node,
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PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1);
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printk(KERN_INFO "Serial port locked ON by debugger !\n");
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if (via_modem && channel_node != 0) {
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unsigned int t0;
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pmac_call_feature(
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PMAC_FTR_MODEM_ENABLE,
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channel_node, 0, 1);
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printk(KERN_INFO "Modem powered up by debugger !\n");
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t0 = readtb();
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while (readtb() - t0 < 3*TB_SPEED)
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eieio();
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}
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/* use the B channel if requested */
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if (xmon_use_sccb) {
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sccc = (volatile unsigned char *)
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((unsigned long)sccc & ~0x20);
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sccd = sccc + 0x10;
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}
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for (i = 20000; i != 0; --i) {
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x = *sccc; eieio();
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}
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*sccc = 9; eieio(); /* reset A or B side */
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*sccc = ((unsigned long)sccc & 0x20)? 0x80: 0x40; eieio();
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for (i = 0; i < sizeof(scc_inittab); ++i) {
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*sccc = scc_inittab[i];
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eieio();
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}
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}
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scc_initialized = 1;
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if (via_modem) {
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for (;;) {
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xmon_write(NULL, "ATE1V1\r", 7);
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if (xmon_expect("OK", 5)) {
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xmon_write(NULL, "ATA\r", 4);
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if (xmon_expect("CONNECT", 40))
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break;
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}
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xmon_write(NULL, "+++", 3);
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xmon_expect("OK", 3);
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}
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}
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}
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#if 0
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extern int (*prom_entry)(void *);
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int
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xmon_exit(void)
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{
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struct prom_args {
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char *service;
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} args;
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for (;;) {
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args.service = "exit";
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(*prom_entry)(&args);
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}
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}
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#endif
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void *xmon_stdin;
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void *xmon_stdout;
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void *xmon_stderr;
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void
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xmon_init(int arg)
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{
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xmon_map_scc();
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}
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int
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xmon_putc(int c, void *f)
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{
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char ch = c;
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if (c == '\n')
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xmon_putc('\r', f);
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return xmon_write(f, &ch, 1) == 1? c: -1;
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}
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int
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xmon_putchar(int c)
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{
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return xmon_putc(c, xmon_stdout);
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}
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int
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xmon_fputs(char *str, void *f)
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{
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int n = strlen(str);
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return xmon_write(f, str, n) == n? 0: -1;
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}
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int
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xmon_readchar(void)
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{
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char ch;
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for (;;) {
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switch (xmon_read(xmon_stdin, &ch, 1)) {
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case 1:
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return ch;
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case -1:
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xmon_printf("read(stdin) returned -1\r\n", 0, 0);
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return -1;
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}
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}
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}
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static char line[256];
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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
|
|
}
|