platforms/powermac/udbg_adb.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/string.h>
0003 #include <linux/kernel.h>
0004 #include <linux/errno.h>
0005 #include <linux/bitops.h>
0006 #include <linux/ptrace.h>
0007 #include <linux/adb.h>
0008 #include <linux/pmu.h>
0009 #include <linux/cuda.h>
0010 #include <linux/of.h>
0011 #include <asm/machdep.h>
0012 #include <asm/io.h>
0013 #include <asm/page.h>
0014 #include <asm/xmon.h>
0015 #include <asm/bootx.h>
0016 #include <asm/errno.h>
0017 #include <asm/pmac_feature.h>
0018 #include <asm/processor.h>
0019 #include <asm/delay.h>
0020 #include <asm/btext.h>
0021 #include <asm/time.h>
0022 #include <asm/udbg.h>
0023
0024 /*
0025  * This implementation is "special", it can "patch" the current
0026  * udbg implementation and work on top of it. It must thus be
0027  * initialized last
0028  */
0029
0030 static void (*udbg_adb_old_putc)(char c);
0031 static int (*udbg_adb_old_getc)(void);
0032 static int (*udbg_adb_old_getc_poll)(void);
0033
0034 static enum {
0035     input_adb_none,
0036     input_adb_pmu,
0037     input_adb_cuda,
0038 } input_type = input_adb_none;
0039
0040 int xmon_wants_key, xmon_adb_keycode;
0041
0042 static inline void udbg_adb_poll(void)
0043 {
0044 #ifdef CONFIG_ADB_PMU
0045     if (input_type == input_adb_pmu)
0046         pmu_poll_adb();
0047 #endif /* CONFIG_ADB_PMU */
0048 #ifdef CONFIG_ADB_CUDA
0049     if (input_type == input_adb_cuda)
0050         cuda_poll();
0051 #endif /* CONFIG_ADB_CUDA */
0052 }
0053
0054 #ifdef CONFIG_BOOTX_TEXT
0055
0056 static int udbg_adb_use_btext;
0057 static int xmon_adb_shiftstate;
0058
0059 static unsigned char xmon_keytab[128] =
0060     "asdfhgzxcv\000bqwer"               /* 0x00 - 0x0f */
0061     "yt123465=97-80]o"              /* 0x10 - 0x1f */
0062     "u[ip\rlj'k;\\,/nm."                /* 0x20 - 0x2f */
0063     "\t `\177\0\033\0\0\0\0\0\0\0\0\0\0"        /* 0x30 - 0x3f */
0064     "\0.\0*\0+\0\0\0\0\0/\r\0-\0"           /* 0x40 - 0x4f */
0065     "\0\0000123456789\0\0\0";           /* 0x50 - 0x5f */
0066
0067 static unsigned char xmon_shift_keytab[128] =
0068     "ASDFHGZXCV\000BQWER"               /* 0x00 - 0x0f */
0069     "YT!@#$^%+(&_*)}O"              /* 0x10 - 0x1f */
0070     "U{IP\rLJ\"K:|<?NM>"                /* 0x20 - 0x2f */
0071     "\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0"        /* 0x30 - 0x3f */
0072     "\0.\0*\0+\0\0\0\0\0/\r\0-\0"           /* 0x40 - 0x4f */
0073     "\0\0000123456789\0\0\0";           /* 0x50 - 0x5f */
0074
0075 static int udbg_adb_local_getc(void)
0076 {
0077     int k, t, on;
0078
0079     xmon_wants_key = 1;
0080     for (;;) {
0081         xmon_adb_keycode = -1;
0082         t = 0;
0083         on = 0;
0084         k = -1;
0085         do {
0086             if (--t < 0) {
0087                 on = 1 - on;
0088                 btext_drawchar(on? 0xdb: 0x20);
0089                 btext_drawchar('\b');
0090                 t = 200000;
0091             }
0092             udbg_adb_poll();
0093             if (udbg_adb_old_getc_poll)
0094                 k = udbg_adb_old_getc_poll();
0095         } while (k == -1 && xmon_adb_keycode == -1);
0096         if (on)
0097             btext_drawstring(" \b");
0098         if (k != -1)
0099             return k;
0100         k = xmon_adb_keycode;
0101
0102         /* test for shift keys */
0103         if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) {
0104             xmon_adb_shiftstate = (k & 0x80) == 0;
0105             continue;
0106         }
0107         if (k >= 0x80)
0108             continue;   /* ignore up transitions */
0109         k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k];
0110         if (k != 0)
0111             break;
0112     }
0113     xmon_wants_key = 0;
0114     return k;
0115 }
0116 #endif /* CONFIG_BOOTX_TEXT */
0117
0118 static int udbg_adb_getc(void)
0119 {
0120 #ifdef CONFIG_BOOTX_TEXT
0121     if (udbg_adb_use_btext && input_type != input_adb_none)
0122         return udbg_adb_local_getc();
0123 #endif
0124     if (udbg_adb_old_getc)
0125         return udbg_adb_old_getc();
0126     return -1;
0127 }
0128
0129 /* getc_poll() is not really used, unless you have the xmon-over modem
0130  * hack that doesn't quite concern us here, thus we just poll the low level
0131  * ADB driver to prevent it from timing out and call back the original poll
0132  * routine.
0133  */
0134 static int udbg_adb_getc_poll(void)
0135 {
0136     udbg_adb_poll();
0137
0138     if (udbg_adb_old_getc_poll)
0139         return udbg_adb_old_getc_poll();
0140     return -1;
0141 }
0142
0143 static void udbg_adb_putc(char c)
0144 {
0145 #ifdef CONFIG_BOOTX_TEXT
0146     if (udbg_adb_use_btext)
0147         btext_drawchar(c);
0148 #endif
0149     if (udbg_adb_old_putc)
0150         return udbg_adb_old_putc(c);
0151 }
0152
0153 void __init udbg_adb_init_early(void)
0154 {
0155 #ifdef CONFIG_BOOTX_TEXT
0156     if (btext_find_display(1) == 0) {
0157         udbg_adb_use_btext = 1;
0158         udbg_putc = udbg_adb_putc;
0159     }
0160 #endif
0161 }
0162
0163 int __init udbg_adb_init(int force_btext)
0164 {
0165     struct device_node *np;
0166
0167     /* Capture existing callbacks */
0168     udbg_adb_old_putc = udbg_putc;
0169     udbg_adb_old_getc = udbg_getc;
0170     udbg_adb_old_getc_poll = udbg_getc_poll;
0171
0172     /* Check if our early init was already called */
0173     if (udbg_adb_old_putc == udbg_adb_putc)
0174         udbg_adb_old_putc = NULL;
0175 #ifdef CONFIG_BOOTX_TEXT
0176     if (udbg_adb_old_putc == btext_drawchar)
0177         udbg_adb_old_putc = NULL;
0178 #endif
0179
0180     /* Set ours as output */
0181     udbg_putc = udbg_adb_putc;
0182     udbg_getc = udbg_adb_getc;
0183     udbg_getc_poll = udbg_adb_getc_poll;
0184
0185 #ifdef CONFIG_BOOTX_TEXT
0186     /* Check if we should use btext output */
0187     if (btext_find_display(force_btext) == 0)
0188         udbg_adb_use_btext = 1;
0189 #endif
0190
0191     /* See if there is a keyboard in the device tree with a parent
0192      * of type "adb". If not, we return a failure, but we keep the
0193      * bext output set for now
0194      */
0195     for_each_node_by_name(np, "keyboard") {
0196         struct device_node *parent = of_get_parent(np);
0197         int found = of_node_is_type(parent, "adb");
0198         of_node_put(parent);
0199         if (found)
0200             break;
0201     }
0202     if (np == NULL)
0203         return -ENODEV;
0204     of_node_put(np);
0205
0206 #ifdef CONFIG_ADB_PMU
0207     if (find_via_pmu())
0208         input_type = input_adb_pmu;
0209 #endif
0210 #ifdef CONFIG_ADB_CUDA
0211     if (find_via_cuda())
0212         input_type = input_adb_cuda;
0213 #endif
0214
0215     /* Same as above: nothing found, keep btext set for output */
0216     if (input_type == input_adb_none)
0217         return -ENODEV;
0218
0219     return 0;
0220 }