Iliyan Malchev | c1db50b | 2010-06-05 17:36:24 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * arch/arm/common/fiq_debugger.c |
| 3 | * |
| 4 | * Serial Debugger Interface accessed through an FIQ interrupt. |
| 5 | * |
| 6 | * Copyright (C) 2008 Google, Inc. |
| 7 | * |
| 8 | * This software is licensed under the terms of the GNU General Public |
| 9 | * License version 2, as published by the Free Software Foundation, and |
| 10 | * may be copied, distributed, and modified under those terms. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | */ |
| 17 | |
| 18 | #include <stdarg.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/io.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/clk.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/kernel_debugger.h> |
| 25 | #include <linux/kernel_stat.h> |
| 26 | #include <linux/irq.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/sched.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/timer.h> |
| 31 | #include <linux/wakelock.h> |
| 32 | |
| 33 | #include <asm/fiq_debugger.h> |
| 34 | #include <asm/fiq_glue.h> |
| 35 | #include <asm/stacktrace.h> |
| 36 | |
| 37 | #include <mach/system.h> |
| 38 | |
| 39 | #include <linux/uaccess.h> |
| 40 | |
| 41 | #define DEBUG_MAX 64 |
| 42 | |
| 43 | struct fiq_debugger_state { |
| 44 | struct fiq_glue_handler handler; |
| 45 | |
| 46 | int fiq; |
| 47 | int signal_irq; |
| 48 | int wakeup_irq; |
| 49 | bool wakeup_irq_no_set_wake; |
| 50 | struct clk *clk; |
| 51 | struct fiq_debugger_pdata *pdata; |
| 52 | struct platform_device *pdev; |
| 53 | |
| 54 | char debug_cmd[DEBUG_MAX]; |
| 55 | int debug_busy; |
| 56 | int debug_abort; |
| 57 | |
| 58 | char debug_buf[DEBUG_MAX]; |
| 59 | int debug_count; |
| 60 | |
| 61 | bool no_sleep; |
| 62 | bool debug_enable; |
| 63 | bool ignore_next_wakeup_irq; |
| 64 | struct timer_list sleep_timer; |
| 65 | bool uart_clk_enabled; |
| 66 | struct wake_lock debugger_wake_lock; |
| 67 | |
| 68 | unsigned int last_irqs[NR_IRQS]; |
| 69 | }; |
| 70 | |
| 71 | #ifdef CONFIG_FIQ_DEBUGGER_NO_SLEEP |
| 72 | static bool initial_no_sleep = true; |
| 73 | #else |
| 74 | static bool initial_no_sleep; |
| 75 | #endif |
| 76 | static bool initial_debug_enable; |
| 77 | |
| 78 | module_param_named(no_sleep, initial_no_sleep, bool, 0644); |
| 79 | module_param_named(debug_enable, initial_debug_enable, bool, 0644); |
| 80 | |
| 81 | #ifdef CONFIG_FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON |
| 82 | static inline void enable_wakeup_irq(struct fiq_debugger_state *state) {} |
| 83 | static inline void disable_wakeup_irq(struct fiq_debugger_state *state) {} |
| 84 | #else |
| 85 | static inline void enable_wakeup_irq(struct fiq_debugger_state *state) |
| 86 | { |
| 87 | if (state->wakeup_irq < 0) |
| 88 | return; |
| 89 | enable_irq(state->wakeup_irq); |
| 90 | if (!state->wakeup_irq_no_set_wake) |
| 91 | enable_irq_wake(state->wakeup_irq); |
| 92 | } |
| 93 | static inline void disable_wakeup_irq(struct fiq_debugger_state *state) |
| 94 | { |
| 95 | if (state->wakeup_irq < 0) |
| 96 | return; |
| 97 | disable_irq_nosync(state->wakeup_irq); |
| 98 | if (!state->wakeup_irq_no_set_wake) |
| 99 | disable_irq_wake(state->wakeup_irq); |
| 100 | } |
| 101 | #endif |
| 102 | |
| 103 | static void debug_force_irq(struct fiq_debugger_state *state) |
| 104 | { |
| 105 | unsigned int irq = state->signal_irq; |
| 106 | if (state->pdata->force_irq) |
| 107 | state->pdata->force_irq(state->pdev, irq); |
| 108 | else { |
| 109 | struct irq_chip *chip = get_irq_chip(irq); |
| 110 | if (chip && chip->retrigger) |
| 111 | chip->retrigger(irq); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | static void debug_uart_flush(struct fiq_debugger_state *state) |
| 116 | { |
| 117 | if (state->pdata->uart_flush) |
| 118 | state->pdata->uart_flush(state->pdev); |
| 119 | } |
| 120 | |
| 121 | static void debug_puts(struct fiq_debugger_state *state, char *s) |
| 122 | { |
| 123 | unsigned c; |
| 124 | while ((c = *s++)) { |
| 125 | if (c == '\n') |
| 126 | state->pdata->uart_putc(state->pdev, '\r'); |
| 127 | state->pdata->uart_putc(state->pdev, c); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | static void debug_prompt(struct fiq_debugger_state *state) |
| 132 | { |
| 133 | debug_puts(state, "debug> "); |
| 134 | } |
| 135 | |
| 136 | int log_buf_copy(char *dest, int idx, int len); |
| 137 | static void dump_kernel_log(struct fiq_debugger_state *state) |
| 138 | { |
| 139 | char buf[1024]; |
| 140 | int idx = 0; |
| 141 | int ret; |
| 142 | int saved_oip; |
| 143 | |
| 144 | /* setting oops_in_progress prevents log_buf_copy() |
| 145 | * from trying to take a spinlock which will make it |
| 146 | * very unhappy in some cases... |
| 147 | */ |
| 148 | saved_oip = oops_in_progress; |
| 149 | oops_in_progress = 1; |
| 150 | for (;;) { |
| 151 | ret = log_buf_copy(buf, idx, 1023); |
| 152 | if (ret <= 0) |
| 153 | break; |
| 154 | buf[ret] = 0; |
| 155 | debug_puts(state, buf); |
| 156 | idx += ret; |
| 157 | } |
| 158 | oops_in_progress = saved_oip; |
| 159 | } |
| 160 | |
| 161 | static char *mode_name(unsigned cpsr) |
| 162 | { |
| 163 | switch (cpsr & MODE_MASK) { |
| 164 | case USR_MODE: return "USR"; |
| 165 | case FIQ_MODE: return "FIQ"; |
| 166 | case IRQ_MODE: return "IRQ"; |
| 167 | case SVC_MODE: return "SVC"; |
| 168 | case ABT_MODE: return "ABT"; |
| 169 | case UND_MODE: return "UND"; |
| 170 | case SYSTEM_MODE: return "SYS"; |
| 171 | default: return "???"; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | static int debug_printf(void *cookie, const char *fmt, ...) |
| 176 | { |
| 177 | struct fiq_debugger_state *state = cookie; |
| 178 | char buf[256]; |
| 179 | va_list ap; |
| 180 | |
| 181 | va_start(ap, fmt); |
| 182 | vsnprintf(buf, sizeof(buf), fmt, ap); |
| 183 | va_end(ap); |
| 184 | |
| 185 | debug_puts(state, buf); |
| 186 | return state->debug_abort; |
| 187 | } |
| 188 | |
| 189 | /* Safe outside fiq context */ |
| 190 | static int debug_printf_nfiq(void *cookie, const char *fmt, ...) |
| 191 | { |
| 192 | struct fiq_debugger_state *state = cookie; |
| 193 | char buf[256]; |
| 194 | va_list ap; |
| 195 | unsigned long irq_flags; |
| 196 | |
| 197 | va_start(ap, fmt); |
| 198 | vsnprintf(buf, 128, fmt, ap); |
| 199 | va_end(ap); |
| 200 | |
| 201 | local_irq_save(irq_flags); |
| 202 | debug_puts(state, buf); |
| 203 | debug_uart_flush(state); |
| 204 | local_irq_restore(irq_flags); |
| 205 | return state->debug_abort; |
| 206 | } |
| 207 | |
| 208 | static void dump_regs(struct fiq_debugger_state *state, unsigned *regs) |
| 209 | { |
| 210 | debug_printf(state, " r0 %08x r1 %08x r2 %08x r3 %08x\n", |
| 211 | regs[0], regs[1], regs[2], regs[3]); |
| 212 | debug_printf(state, " r4 %08x r5 %08x r6 %08x r7 %08x\n", |
| 213 | regs[4], regs[5], regs[6], regs[7]); |
| 214 | debug_printf(state, " r8 %08x r9 %08x r10 %08x r11 %08x mode %s\n", |
| 215 | regs[8], regs[9], regs[10], regs[11], |
| 216 | mode_name(regs[16])); |
| 217 | if ((regs[16] & MODE_MASK) == USR_MODE) |
| 218 | debug_printf(state, " ip %08x sp %08x lr %08x pc %08x " |
| 219 | "cpsr %08x\n", regs[12], regs[13], regs[14], |
| 220 | regs[15], regs[16]); |
| 221 | else |
| 222 | debug_printf(state, " ip %08x sp %08x lr %08x pc %08x " |
| 223 | "cpsr %08x spsr %08x\n", regs[12], regs[13], |
| 224 | regs[14], regs[15], regs[16], regs[17]); |
| 225 | } |
| 226 | |
| 227 | struct mode_regs { |
| 228 | unsigned long sp_svc; |
| 229 | unsigned long lr_svc; |
| 230 | unsigned long spsr_svc; |
| 231 | |
| 232 | unsigned long sp_abt; |
| 233 | unsigned long lr_abt; |
| 234 | unsigned long spsr_abt; |
| 235 | |
| 236 | unsigned long sp_und; |
| 237 | unsigned long lr_und; |
| 238 | unsigned long spsr_und; |
| 239 | |
| 240 | unsigned long sp_irq; |
| 241 | unsigned long lr_irq; |
| 242 | unsigned long spsr_irq; |
| 243 | |
| 244 | unsigned long r8_fiq; |
| 245 | unsigned long r9_fiq; |
| 246 | unsigned long r10_fiq; |
| 247 | unsigned long r11_fiq; |
| 248 | unsigned long r12_fiq; |
| 249 | unsigned long sp_fiq; |
| 250 | unsigned long lr_fiq; |
| 251 | unsigned long spsr_fiq; |
| 252 | }; |
| 253 | |
| 254 | void __naked get_mode_regs(struct mode_regs *regs) |
| 255 | { |
| 256 | asm volatile ( |
| 257 | "mrs r1, cpsr\n" |
| 258 | "msr cpsr_c, #0xd3 @(SVC_MODE | PSR_I_BIT | PSR_F_BIT)\n" |
| 259 | "stmia r0!, {r13 - r14}\n" |
| 260 | "mrs r2, spsr\n" |
| 261 | "msr cpsr_c, #0xd7 @(ABT_MODE | PSR_I_BIT | PSR_F_BIT)\n" |
| 262 | "stmia r0!, {r2, r13 - r14}\n" |
| 263 | "mrs r2, spsr\n" |
| 264 | "msr cpsr_c, #0xdb @(UND_MODE | PSR_I_BIT | PSR_F_BIT)\n" |
| 265 | "stmia r0!, {r2, r13 - r14}\n" |
| 266 | "mrs r2, spsr\n" |
| 267 | "msr cpsr_c, #0xd2 @(IRQ_MODE | PSR_I_BIT | PSR_F_BIT)\n" |
| 268 | "stmia r0!, {r2, r13 - r14}\n" |
| 269 | "mrs r2, spsr\n" |
| 270 | "msr cpsr_c, #0xd1 @(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)\n" |
| 271 | "stmia r0!, {r2, r8 - r14}\n" |
| 272 | "mrs r2, spsr\n" |
| 273 | "stmia r0!, {r2}\n" |
| 274 | "msr cpsr_c, r1\n" |
| 275 | "bx lr\n"); |
| 276 | } |
| 277 | |
| 278 | |
| 279 | static void dump_allregs(struct fiq_debugger_state *state, unsigned *regs) |
| 280 | { |
| 281 | struct mode_regs mode_regs; |
| 282 | dump_regs(state, regs); |
| 283 | get_mode_regs(&mode_regs); |
| 284 | debug_printf(state, " svc: sp %08x lr %08x spsr %08x\n", |
| 285 | mode_regs.sp_svc, mode_regs.lr_svc, mode_regs.spsr_svc); |
| 286 | debug_printf(state, " abt: sp %08x lr %08x spsr %08x\n", |
| 287 | mode_regs.sp_abt, mode_regs.lr_abt, mode_regs.spsr_abt); |
| 288 | debug_printf(state, " und: sp %08x lr %08x spsr %08x\n", |
| 289 | mode_regs.sp_und, mode_regs.lr_und, mode_regs.spsr_und); |
| 290 | debug_printf(state, " irq: sp %08x lr %08x spsr %08x\n", |
| 291 | mode_regs.sp_irq, mode_regs.lr_irq, mode_regs.spsr_irq); |
| 292 | debug_printf(state, " fiq: r8 %08x r9 %08x r10 %08x r11 %08x " |
| 293 | "r12 %08x\n", |
| 294 | mode_regs.r8_fiq, mode_regs.r9_fiq, mode_regs.r10_fiq, |
| 295 | mode_regs.r11_fiq, mode_regs.r12_fiq); |
| 296 | debug_printf(state, " fiq: sp %08x lr %08x spsr %08x\n", |
| 297 | mode_regs.sp_fiq, mode_regs.lr_fiq, mode_regs.spsr_fiq); |
| 298 | } |
| 299 | |
| 300 | static void dump_irqs(struct fiq_debugger_state *state) |
| 301 | { |
| 302 | int n; |
| 303 | debug_printf(state, "irqnr total since-last status name\n"); |
| 304 | for (n = 0; n < NR_IRQS; n++) { |
| 305 | struct irqaction *act = irq_desc[n].action; |
| 306 | if (!act && !kstat_irqs(n)) |
| 307 | continue; |
| 308 | debug_printf(state, "%5d: %10u %11u %8x %s\n", n, |
| 309 | kstat_irqs(n), |
| 310 | kstat_irqs(n) - state->last_irqs[n], |
| 311 | irq_desc[n].status, |
| 312 | (act && act->name) ? act->name : "???"); |
| 313 | state->last_irqs[n] = kstat_irqs(n); |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | struct stacktrace_state { |
| 318 | struct fiq_debugger_state *state; |
| 319 | unsigned int depth; |
| 320 | }; |
| 321 | |
| 322 | static int report_trace(struct stackframe *frame, void *d) |
| 323 | { |
| 324 | struct stacktrace_state *sts = d; |
| 325 | |
| 326 | if (sts->depth) { |
| 327 | debug_printf(sts->state, |
| 328 | " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n", |
| 329 | frame->pc, frame->pc, frame->lr, frame->lr, |
| 330 | frame->sp, frame->fp); |
| 331 | sts->depth--; |
| 332 | return 0; |
| 333 | } |
| 334 | debug_printf(sts->state, " ...\n"); |
| 335 | |
| 336 | return sts->depth == 0; |
| 337 | } |
| 338 | |
| 339 | struct frame_tail { |
| 340 | struct frame_tail *fp; |
| 341 | unsigned long sp; |
| 342 | unsigned long lr; |
| 343 | } __attribute__((packed)); |
| 344 | |
| 345 | static struct frame_tail *user_backtrace(struct fiq_debugger_state *state, |
| 346 | struct frame_tail *tail) |
| 347 | { |
| 348 | struct frame_tail buftail[2]; |
| 349 | |
| 350 | /* Also check accessibility of one struct frame_tail beyond */ |
| 351 | if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) { |
| 352 | debug_printf(state, " invalid frame pointer %p\n", tail); |
| 353 | return NULL; |
| 354 | } |
| 355 | if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) { |
| 356 | debug_printf(state, |
| 357 | " failed to copy frame pointer %p\n", tail); |
| 358 | return NULL; |
| 359 | } |
| 360 | |
| 361 | debug_printf(state, " %p\n", buftail[0].lr); |
| 362 | |
| 363 | /* frame pointers should strictly progress back up the stack |
| 364 | * (towards higher addresses) */ |
| 365 | if (tail >= buftail[0].fp) |
| 366 | return NULL; |
| 367 | |
| 368 | return buftail[0].fp-1; |
| 369 | } |
| 370 | |
| 371 | void dump_stacktrace(struct fiq_debugger_state *state, |
| 372 | struct pt_regs * const regs, unsigned int depth, void *ssp) |
| 373 | { |
| 374 | struct frame_tail *tail; |
| 375 | struct thread_info *real_thread_info = (struct thread_info *) |
| 376 | ((unsigned long)ssp & ~(THREAD_SIZE - 1)); |
| 377 | struct stacktrace_state sts; |
| 378 | |
| 379 | sts.depth = depth; |
| 380 | sts.state = state; |
| 381 | *current_thread_info() = *real_thread_info; |
| 382 | |
| 383 | if (!current) |
| 384 | debug_printf(state, "current NULL\n"); |
| 385 | else |
| 386 | debug_printf(state, "pid: %d comm: %s\n", |
| 387 | current->pid, current->comm); |
| 388 | dump_regs(state, (unsigned *)regs); |
| 389 | |
| 390 | if (!user_mode(regs)) { |
| 391 | struct stackframe frame; |
| 392 | frame.fp = regs->ARM_fp; |
| 393 | frame.sp = regs->ARM_sp; |
| 394 | frame.lr = regs->ARM_lr; |
| 395 | frame.pc = regs->ARM_pc; |
| 396 | debug_printf(state, |
| 397 | " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n", |
| 398 | regs->ARM_pc, regs->ARM_pc, regs->ARM_lr, regs->ARM_lr, |
| 399 | regs->ARM_sp, regs->ARM_fp); |
| 400 | walk_stackframe(&frame, report_trace, &sts); |
| 401 | return; |
| 402 | } |
| 403 | |
| 404 | tail = ((struct frame_tail *) regs->ARM_fp) - 1; |
| 405 | while (depth-- && tail && !((unsigned long) tail & 3)) |
| 406 | tail = user_backtrace(state, tail); |
| 407 | } |
| 408 | |
| 409 | static void debug_exec(struct fiq_debugger_state *state, |
| 410 | const char *cmd, unsigned *regs, void *svc_sp) |
| 411 | { |
| 412 | if (!strcmp(cmd, "pc")) { |
| 413 | debug_printf(state, " pc %08x cpsr %08x mode %s\n", |
| 414 | regs[15], regs[16], mode_name(regs[16])); |
| 415 | } else if (!strcmp(cmd, "regs")) { |
| 416 | dump_regs(state, regs); |
| 417 | } else if (!strcmp(cmd, "allregs")) { |
| 418 | dump_allregs(state, regs); |
| 419 | } else if (!strcmp(cmd, "bt")) { |
| 420 | dump_stacktrace(state, (struct pt_regs *)regs, 100, svc_sp); |
| 421 | } else if (!strcmp(cmd, "reboot")) { |
| 422 | arch_reset(0, 0); |
| 423 | } else if (!strcmp(cmd, "irqs")) { |
| 424 | dump_irqs(state); |
| 425 | } else if (!strcmp(cmd, "kmsg")) { |
| 426 | dump_kernel_log(state); |
| 427 | } else if (!strcmp(cmd, "version")) { |
| 428 | debug_printf(state, "%s\n", linux_banner); |
| 429 | } else if (!strcmp(cmd, "sleep")) { |
| 430 | state->no_sleep = false; |
| 431 | } else if (!strcmp(cmd, "nosleep")) { |
| 432 | state->no_sleep = true; |
| 433 | } else { |
| 434 | if (state->debug_busy) { |
| 435 | debug_printf(state, |
| 436 | "command processor busy. trying to abort.\n"); |
| 437 | state->debug_abort = -1; |
| 438 | } else { |
| 439 | strcpy(state->debug_cmd, cmd); |
| 440 | state->debug_busy = 1; |
| 441 | } |
| 442 | |
| 443 | debug_force_irq(state); |
| 444 | |
| 445 | return; |
| 446 | } |
| 447 | debug_prompt(state); |
| 448 | } |
| 449 | |
| 450 | static void sleep_timer_expired(unsigned long data) |
| 451 | { |
| 452 | struct fiq_debugger_state *state = (struct fiq_debugger_state *)data; |
| 453 | |
| 454 | if (state->uart_clk_enabled && !state->no_sleep) { |
| 455 | if (state->debug_enable) { |
| 456 | state->debug_enable = false; |
| 457 | debug_printf_nfiq(state, "suspending fiq debugger\n"); |
| 458 | } |
| 459 | state->ignore_next_wakeup_irq = true; |
| 460 | if (state->clk) |
| 461 | clk_disable(state->clk); |
| 462 | state->uart_clk_enabled = false; |
| 463 | enable_wakeup_irq(state); |
| 464 | } |
| 465 | wake_unlock(&state->debugger_wake_lock); |
| 466 | } |
| 467 | |
| 468 | static irqreturn_t wakeup_irq_handler(int irq, void *dev) |
| 469 | { |
| 470 | struct fiq_debugger_state *state = dev; |
| 471 | |
| 472 | if (!state->no_sleep) |
| 473 | debug_puts(state, "WAKEUP\n"); |
| 474 | if (state->ignore_next_wakeup_irq) |
| 475 | state->ignore_next_wakeup_irq = false; |
| 476 | else if (!state->uart_clk_enabled) { |
| 477 | wake_lock(&state->debugger_wake_lock); |
| 478 | if (state->clk) |
| 479 | clk_enable(state->clk); |
| 480 | state->uart_clk_enabled = true; |
| 481 | disable_wakeup_irq(state); |
| 482 | mod_timer(&state->sleep_timer, jiffies + HZ / 2); |
| 483 | } |
| 484 | return IRQ_HANDLED; |
| 485 | } |
| 486 | |
| 487 | static irqreturn_t debug_irq(int irq, void *dev) |
| 488 | { |
| 489 | struct fiq_debugger_state *state = dev; |
| 490 | if (state->pdata->force_irq_ack) |
| 491 | state->pdata->force_irq_ack(state->pdev, state->signal_irq); |
| 492 | |
| 493 | if (!state->no_sleep) { |
| 494 | wake_lock(&state->debugger_wake_lock); |
| 495 | mod_timer(&state->sleep_timer, jiffies + HZ * 5); |
| 496 | } |
| 497 | if (state->debug_busy) { |
| 498 | struct kdbg_ctxt ctxt; |
| 499 | |
| 500 | ctxt.printf = debug_printf_nfiq; |
| 501 | ctxt.cookie = state; |
| 502 | kernel_debugger(&ctxt, state->debug_cmd); |
| 503 | debug_prompt(state); |
| 504 | |
| 505 | state->debug_busy = 0; |
| 506 | } |
| 507 | return IRQ_HANDLED; |
| 508 | } |
| 509 | |
| 510 | static int debug_getc(struct fiq_debugger_state *state) |
| 511 | { |
| 512 | return state->pdata->uart_getc(state->pdev); |
| 513 | } |
| 514 | |
| 515 | static void debug_fiq(struct fiq_glue_handler *h, void *regs, void *svc_sp) |
| 516 | { |
| 517 | struct fiq_debugger_state *state = |
| 518 | container_of(h, struct fiq_debugger_state, handler); |
| 519 | int c; |
| 520 | static int last_c; |
| 521 | int count = 0; |
| 522 | |
| 523 | while ((c = debug_getc(state)) != FIQ_DEBUGGER_NO_CHAR) { |
| 524 | count++; |
| 525 | if (!state->debug_enable) { |
| 526 | if ((c == 13) || (c == 10)) { |
| 527 | state->debug_enable = true; |
| 528 | state->debug_count = 0; |
| 529 | debug_prompt(state); |
| 530 | } |
| 531 | } else if ((c >= ' ') && (c < 127)) { |
| 532 | if (state->debug_count < (DEBUG_MAX - 1)) { |
| 533 | state->debug_buf[state->debug_count++] = c; |
| 534 | state->pdata->uart_putc(state->pdev, c); |
| 535 | } |
| 536 | } else if ((c == 8) || (c == 127)) { |
| 537 | if (state->debug_count > 0) { |
| 538 | state->debug_count--; |
| 539 | state->pdata->uart_putc(state->pdev, 8); |
| 540 | state->pdata->uart_putc(state->pdev, ' '); |
| 541 | state->pdata->uart_putc(state->pdev, 8); |
| 542 | } |
| 543 | } else if ((c == 13) || (c == 10)) { |
| 544 | if (c == '\r' || (c == '\n' && last_c != '\r')) { |
| 545 | state->pdata->uart_putc(state->pdev, '\r'); |
| 546 | state->pdata->uart_putc(state->pdev, '\n'); |
| 547 | } |
| 548 | if (state->debug_count) { |
| 549 | state->debug_buf[state->debug_count] = 0; |
| 550 | state->debug_count = 0; |
| 551 | debug_exec(state, state->debug_buf, |
| 552 | regs, svc_sp); |
| 553 | } else { |
| 554 | debug_prompt(state); |
| 555 | } |
| 556 | } |
| 557 | last_c = c; |
| 558 | } |
| 559 | debug_uart_flush(state); |
| 560 | if (state->pdata->fiq_ack) |
| 561 | state->pdata->fiq_ack(state->pdev, state->fiq); |
| 562 | |
| 563 | /* poke sleep timer if necessary */ |
| 564 | if (state->debug_enable && !state->no_sleep) |
| 565 | debug_force_irq(state); |
| 566 | } |
| 567 | |
| 568 | static void debug_resume(struct fiq_glue_handler *h) |
| 569 | { |
| 570 | struct fiq_debugger_state *state = |
| 571 | container_of(h, struct fiq_debugger_state, handler); |
| 572 | if (state->pdata->uart_resume) |
| 573 | state->pdata->uart_resume(state->pdev); |
| 574 | } |
| 575 | |
| 576 | static int fiq_debugger_probe(struct platform_device *pdev) |
| 577 | { |
| 578 | int ret; |
| 579 | struct fiq_debugger_pdata *pdata = dev_get_platdata(&pdev->dev); |
| 580 | struct fiq_debugger_state *state; |
| 581 | |
| 582 | if (!pdata->uart_getc || !pdata->uart_putc || !pdata->fiq_enable) |
| 583 | return -EINVAL; |
| 584 | |
| 585 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
| 586 | state->handler.fiq = debug_fiq; |
| 587 | state->handler.resume = debug_resume; |
| 588 | setup_timer(&state->sleep_timer, sleep_timer_expired, |
| 589 | (unsigned long)state); |
| 590 | state->pdata = pdata; |
| 591 | state->pdev = pdev; |
| 592 | state->no_sleep = initial_no_sleep; |
| 593 | state->debug_enable = initial_debug_enable; |
| 594 | |
| 595 | state->fiq = platform_get_irq_byname(pdev, "fiq"); |
| 596 | state->signal_irq = platform_get_irq_byname(pdev, "signal"); |
| 597 | state->wakeup_irq = platform_get_irq_byname(pdev, "wakeup"); |
| 598 | |
| 599 | if (state->wakeup_irq < 0) |
| 600 | state->no_sleep = true; |
| 601 | state->ignore_next_wakeup_irq = !state->no_sleep; |
| 602 | |
| 603 | wake_lock_init(&state->debugger_wake_lock, |
| 604 | WAKE_LOCK_SUSPEND, "serial-debug"); |
| 605 | |
| 606 | state->clk = clk_get(&pdev->dev, NULL); |
| 607 | if (IS_ERR(state->clk)) |
| 608 | state->clk = NULL; |
| 609 | |
| 610 | if (state->clk) |
| 611 | clk_enable(state->clk); |
| 612 | |
| 613 | if (pdata->uart_init) { |
| 614 | ret = pdata->uart_init(pdev); |
| 615 | if (ret) |
| 616 | goto err_uart_init; |
| 617 | } |
| 618 | |
| 619 | debug_printf_nfiq(state, "<hit enter %sto activate fiq debugger>\n", |
| 620 | state->no_sleep ? "" : "twice "); |
| 621 | |
| 622 | ret = fiq_glue_register_handler(&state->handler); |
| 623 | if (ret) { |
| 624 | pr_err("serial_debugger: could not install fiq handler\n"); |
| 625 | goto err_register_fiq; |
| 626 | } |
| 627 | |
| 628 | pdata->fiq_enable(pdev, state->fiq, 1); |
| 629 | |
| 630 | if (state->clk) |
| 631 | clk_disable(state->clk); |
| 632 | |
| 633 | ret = request_irq(state->signal_irq, debug_irq, |
| 634 | IRQF_TRIGGER_RISING, "debug", state); |
| 635 | if (ret) |
| 636 | pr_err("serial_debugger: could not install signal_irq"); |
| 637 | |
| 638 | if (state->wakeup_irq >= 0) { |
| 639 | ret = request_irq(state->wakeup_irq, wakeup_irq_handler, |
| 640 | IRQF_TRIGGER_FALLING | IRQF_DISABLED, |
| 641 | "debug-wakeup", state); |
| 642 | if (ret) { |
| 643 | pr_err("serial_debugger: " |
| 644 | "could not install wakeup irq\n"); |
| 645 | state->wakeup_irq = -1; |
| 646 | } else { |
| 647 | ret = enable_irq_wake(state->wakeup_irq); |
| 648 | if (ret) { |
| 649 | pr_err("serial_debugger: " |
| 650 | "could not enable wakeup\n"); |
| 651 | state->wakeup_irq_no_set_wake = true; |
| 652 | } |
| 653 | } |
| 654 | } |
| 655 | if (state->no_sleep) |
| 656 | wakeup_irq_handler(state->wakeup_irq, state); |
| 657 | |
| 658 | return 0; |
| 659 | |
| 660 | err_register_fiq: |
| 661 | if (pdata->uart_free) |
| 662 | pdata->uart_free(pdev); |
| 663 | err_uart_init: |
| 664 | kfree(state); |
| 665 | if (state->clk) |
| 666 | clk_put(state->clk); |
| 667 | return ret; |
| 668 | } |
| 669 | |
| 670 | static struct platform_driver fiq_debugger_driver = { |
| 671 | .probe = fiq_debugger_probe, |
| 672 | .driver.name = "fiq_debugger", |
| 673 | }; |
| 674 | |
| 675 | static int __init fiq_debugger_init(void) |
| 676 | { |
| 677 | return platform_driver_register(&fiq_debugger_driver); |
| 678 | } |
| 679 | |
| 680 | postcore_initcall(fiq_debugger_init); |