221 lines
5 KiB
C
Executable file
221 lines
5 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/bitops.h>
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#include <linux/ptrace.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 <asm/machdep.h>
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#include <asm/io.h>
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#include <asm/page.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/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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#include <asm/time.h>
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#include <asm/udbg.h>
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/*
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* This implementation is "special", it can "patch" the current
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* udbg implementation and work on top of it. It must thus be
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* initialized last
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*/
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static void (*udbg_adb_old_putc)(char c);
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static int (*udbg_adb_old_getc)(void);
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static int (*udbg_adb_old_getc_poll)(void);
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static enum {
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input_adb_none,
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input_adb_pmu,
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input_adb_cuda,
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} input_type = input_adb_none;
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int xmon_wants_key, xmon_adb_keycode;
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static inline void udbg_adb_poll(void)
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{
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#ifdef CONFIG_ADB_PMU
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if (input_type == input_adb_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 (input_type == input_adb_cuda)
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cuda_poll();
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#endif /* CONFIG_ADB_CUDA */
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}
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#ifdef CONFIG_BOOTX_TEXT
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static int udbg_adb_use_btext;
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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 udbg_adb_local_getc(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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k = -1;
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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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udbg_adb_poll();
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if (udbg_adb_old_getc_poll)
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k = udbg_adb_old_getc_poll();
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} while (k == -1 && xmon_adb_keycode == -1);
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if (on)
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btext_drawstring(" \b");
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if (k != -1)
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return k;
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k = xmon_adb_keycode;
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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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static int udbg_adb_getc(void)
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{
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#ifdef CONFIG_BOOTX_TEXT
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if (udbg_adb_use_btext && input_type != input_adb_none)
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return udbg_adb_local_getc();
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#endif
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if (udbg_adb_old_getc)
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return udbg_adb_old_getc();
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return -1;
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}
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/* getc_poll() is not really used, unless you have the xmon-over modem
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* hack that doesn't quite concern us here, thus we just poll the low level
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* ADB driver to prevent it from timing out and call back the original poll
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* routine.
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*/
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static int udbg_adb_getc_poll(void)
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{
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udbg_adb_poll();
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if (udbg_adb_old_getc_poll)
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return udbg_adb_old_getc_poll();
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return -1;
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}
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static void udbg_adb_putc(char c)
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{
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#ifdef CONFIG_BOOTX_TEXT
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if (udbg_adb_use_btext)
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btext_drawchar(c);
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#endif
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if (udbg_adb_old_putc)
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return udbg_adb_old_putc(c);
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}
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void __init udbg_adb_init_early(void)
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{
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#ifdef CONFIG_BOOTX_TEXT
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if (btext_find_display(1) == 0) {
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udbg_adb_use_btext = 1;
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udbg_putc = udbg_adb_putc;
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}
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#endif
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}
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int __init udbg_adb_init(int force_btext)
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{
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struct device_node *np;
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/* Capture existing callbacks */
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udbg_adb_old_putc = udbg_putc;
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udbg_adb_old_getc = udbg_getc;
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udbg_adb_old_getc_poll = udbg_getc_poll;
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/* Check if our early init was already called */
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if (udbg_adb_old_putc == udbg_adb_putc)
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udbg_adb_old_putc = NULL;
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#ifdef CONFIG_BOOTX_TEXT
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if (udbg_adb_old_putc == btext_drawchar)
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udbg_adb_old_putc = NULL;
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#endif
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/* Set ours as output */
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udbg_putc = udbg_adb_putc;
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udbg_getc = udbg_adb_getc;
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udbg_getc_poll = udbg_adb_getc_poll;
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#ifdef CONFIG_BOOTX_TEXT
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/* Check if we should use btext output */
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if (btext_find_display(force_btext) == 0)
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udbg_adb_use_btext = 1;
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#endif
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/* See if there is a keyboard in the device tree with a parent
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* of type "adb". If not, we return a failure, but we keep the
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* bext output set for now
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*/
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for_each_node_by_name(np, "keyboard") {
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struct device_node *parent = of_get_parent(np);
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int found = (parent && strcmp(parent->type, "adb") == 0);
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of_node_put(parent);
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if (found)
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break;
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}
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if (np == NULL)
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return -ENODEV;
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of_node_put(np);
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#ifdef CONFIG_ADB_PMU
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if (find_via_pmu())
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input_type = input_adb_pmu;
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#endif
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#ifdef CONFIG_ADB_CUDA
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if (find_via_cuda())
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input_type = input_adb_cuda;
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#endif
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/* Same as above: nothing found, keep btext set for output */
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if (input_type == input_adb_none)
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return -ENODEV;
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return 0;
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}
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