1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/string.h> 3 #include <linux/kernel.h> 4 #include <linux/errno.h> 5 #include <linux/bitops.h> 6 #include <linux/ptrace.h> 7 #include <linux/adb.h> 8 #include <linux/pmu.h> 9 #include <linux/cuda.h> 10 #include <linux/of.h> 11 #include <asm/machdep.h> 12 #include <asm/io.h> 13 #include <asm/page.h> 14 #include <asm/xmon.h> 15 #include <asm/bootx.h> 16 #include <asm/errno.h> 17 #include <asm/pmac_feature.h> 18 #include <asm/processor.h> 19 #include <asm/delay.h> 20 #include <asm/btext.h> 21 #include <asm/time.h> 22 #include <asm/udbg.h> 23 24 /* 25 * This implementation is "special", it can "patch" the current 26 * udbg implementation and work on top of it. It must thus be 27 * initialized last 28 */ 29 30 static void (*udbg_adb_old_putc)(char c); 31 static int (*udbg_adb_old_getc)(void); 32 static int (*udbg_adb_old_getc_poll)(void); 33 34 static enum { 35 input_adb_none, 36 input_adb_pmu, 37 input_adb_cuda, 38 } input_type = input_adb_none; 39 40 int xmon_wants_key, xmon_adb_keycode; 41 42 static inline void udbg_adb_poll(void) 43 { 44 #ifdef CONFIG_ADB_PMU 45 if (input_type == input_adb_pmu) 46 pmu_poll_adb(); 47 #endif /* CONFIG_ADB_PMU */ 48 #ifdef CONFIG_ADB_CUDA 49 if (input_type == input_adb_cuda) 50 cuda_poll(); 51 #endif /* CONFIG_ADB_CUDA */ 52 } 53 54 #ifdef CONFIG_BOOTX_TEXT 55 56 static int udbg_adb_use_btext; 57 static int xmon_adb_shiftstate; 58 59 static unsigned char xmon_keytab[128] = 60 "asdfhgzxcv\000bqwer" /* 0x00 - 0x0f */ 61 "yt123465=97-80]o" /* 0x10 - 0x1f */ 62 "u[ip\rlj'k;\\,/nm." /* 0x20 - 0x2f */ 63 "\t `\177\0\033\0\0\0\0\0\0\0\0\0\0" /* 0x30 - 0x3f */ 64 "\0.\0*\0+\0\0\0\0\0/\r\0-\0" /* 0x40 - 0x4f */ 65 "\0\0000123456789\0\0\0"; /* 0x50 - 0x5f */ 66 67 static unsigned char xmon_shift_keytab[128] = 68 "ASDFHGZXCV\000BQWER" /* 0x00 - 0x0f */ 69 "YT!@#$^%+(&_*)}O" /* 0x10 - 0x1f */ 70 "U{IP\rLJ\"K:|<?NM>" /* 0x20 - 0x2f */ 71 "\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0" /* 0x30 - 0x3f */ 72 "\0.\0*\0+\0\0\0\0\0/\r\0-\0" /* 0x40 - 0x4f */ 73 "\0\0000123456789\0\0\0"; /* 0x50 - 0x5f */ 74 75 static int udbg_adb_local_getc(void) 76 { 77 int k, t, on; 78 79 xmon_wants_key = 1; 80 for (;;) { 81 xmon_adb_keycode = -1; 82 t = 0; 83 on = 0; 84 k = -1; 85 do { 86 if (--t < 0) { 87 on = 1 - on; 88 btext_drawchar(on? 0xdb: 0x20); 89 btext_drawchar('\b'); 90 t = 200000; 91 } 92 udbg_adb_poll(); 93 if (udbg_adb_old_getc_poll) 94 k = udbg_adb_old_getc_poll(); 95 } while (k == -1 && xmon_adb_keycode == -1); 96 if (on) 97 btext_drawstring(" \b"); 98 if (k != -1) 99 return k; 100 k = xmon_adb_keycode; 101 102 /* test for shift keys */ 103 if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) { 104 xmon_adb_shiftstate = (k & 0x80) == 0; 105 continue; 106 } 107 if (k >= 0x80) 108 continue; /* ignore up transitions */ 109 k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k]; 110 if (k != 0) 111 break; 112 } 113 xmon_wants_key = 0; 114 return k; 115 } 116 #endif /* CONFIG_BOOTX_TEXT */ 117 118 static int udbg_adb_getc(void) 119 { 120 #ifdef CONFIG_BOOTX_TEXT 121 if (udbg_adb_use_btext && input_type != input_adb_none) 122 return udbg_adb_local_getc(); 123 #endif 124 if (udbg_adb_old_getc) 125 return udbg_adb_old_getc(); 126 return -1; 127 } 128 129 /* getc_poll() is not really used, unless you have the xmon-over modem 130 * hack that doesn't quite concern us here, thus we just poll the low level 131 * ADB driver to prevent it from timing out and call back the original poll 132 * routine. 133 */ 134 static int udbg_adb_getc_poll(void) 135 { 136 udbg_adb_poll(); 137 138 if (udbg_adb_old_getc_poll) 139 return udbg_adb_old_getc_poll(); 140 return -1; 141 } 142 143 static void udbg_adb_putc(char c) 144 { 145 #ifdef CONFIG_BOOTX_TEXT 146 if (udbg_adb_use_btext) 147 btext_drawchar(c); 148 #endif 149 if (udbg_adb_old_putc) 150 return udbg_adb_old_putc(c); 151 } 152 153 void __init udbg_adb_init_early(void) 154 { 155 #ifdef CONFIG_BOOTX_TEXT 156 if (btext_find_display(1) == 0) { 157 udbg_adb_use_btext = 1; 158 udbg_putc = udbg_adb_putc; 159 } 160 #endif 161 } 162 163 int __init udbg_adb_init(int force_btext) 164 { 165 struct device_node *np; 166 167 /* Capture existing callbacks */ 168 udbg_adb_old_putc = udbg_putc; 169 udbg_adb_old_getc = udbg_getc; 170 udbg_adb_old_getc_poll = udbg_getc_poll; 171 172 /* Check if our early init was already called */ 173 if (udbg_adb_old_putc == udbg_adb_putc) 174 udbg_adb_old_putc = NULL; 175 #ifdef CONFIG_BOOTX_TEXT 176 if (udbg_adb_old_putc == btext_drawchar) 177 udbg_adb_old_putc = NULL; 178 #endif 179 180 /* Set ours as output */ 181 udbg_putc = udbg_adb_putc; 182 udbg_getc = udbg_adb_getc; 183 udbg_getc_poll = udbg_adb_getc_poll; 184 185 #ifdef CONFIG_BOOTX_TEXT 186 /* Check if we should use btext output */ 187 if (btext_find_display(force_btext) == 0) 188 udbg_adb_use_btext = 1; 189 #endif 190 191 /* See if there is a keyboard in the device tree with a parent 192 * of type "adb". If not, we return a failure, but we keep the 193 * bext output set for now 194 */ 195 for_each_node_by_name(np, "keyboard") { 196 struct device_node *parent = of_get_parent(np); 197 int found = of_node_is_type(parent, "adb"); 198 of_node_put(parent); 199 if (found) 200 break; 201 } 202 if (np == NULL) 203 return -ENODEV; 204 of_node_put(np); 205 206 #ifdef CONFIG_ADB_PMU 207 if (find_via_pmu()) 208 input_type = input_adb_pmu; 209 #endif 210 #ifdef CONFIG_ADB_CUDA 211 if (find_via_cuda()) 212 input_type = input_adb_cuda; 213 #endif 214 215 /* Same as above: nothing found, keep btext set for output */ 216 if (input_type == input_adb_none) 217 return -ENODEV; 218 219 return 0; 220 } 221