fiq_debugger.c revision a2f861391a48af926fb3f73ba7a781fe6701bf93
1/* 2 * drivers/staging/android/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/console.h> 22#include <linux/interrupt.h> 23#include <linux/clk.h> 24#include <linux/platform_device.h> 25#include <linux/kernel_stat.h> 26#include <linux/kmsg_dump.h> 27#include <linux/irq.h> 28#include <linux/delay.h> 29#include <linux/reboot.h> 30#include <linux/sched.h> 31#include <linux/slab.h> 32#include <linux/smp.h> 33#include <linux/timer.h> 34#include <linux/tty.h> 35#include <linux/tty_flip.h> 36#include <linux/wakelock.h> 37 38#include <asm/fiq_glue.h> 39#include <asm/stacktrace.h> 40 41#include <linux/uaccess.h> 42 43#include "fiq_debugger.h" 44#include "fiq_debugger_ringbuf.h" 45 46#define DEBUG_MAX 64 47#define MAX_UNHANDLED_FIQ_COUNT 1000000 48 49#define MAX_FIQ_DEBUGGER_PORTS 4 50 51#define THREAD_INFO(sp) ((struct thread_info *) \ 52 ((unsigned long)(sp) & ~(THREAD_SIZE - 1))) 53 54struct fiq_debugger_state { 55 struct fiq_glue_handler handler; 56 57 int fiq; 58 int uart_irq; 59 int signal_irq; 60 int wakeup_irq; 61 bool wakeup_irq_no_set_wake; 62 struct clk *clk; 63 struct fiq_debugger_pdata *pdata; 64 struct platform_device *pdev; 65 66 char debug_cmd[DEBUG_MAX]; 67 int debug_busy; 68 int debug_abort; 69 70 char debug_buf[DEBUG_MAX]; 71 int debug_count; 72 73 bool no_sleep; 74 bool debug_enable; 75 bool ignore_next_wakeup_irq; 76 struct timer_list sleep_timer; 77 spinlock_t sleep_timer_lock; 78 bool uart_enabled; 79 struct wake_lock debugger_wake_lock; 80 bool console_enable; 81 int current_cpu; 82 atomic_t unhandled_fiq_count; 83 bool in_fiq; 84 85 struct work_struct work; 86 spinlock_t work_lock; 87 char work_cmd[DEBUG_MAX]; 88 89#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE 90 spinlock_t console_lock; 91 struct console console; 92 struct tty_port tty_port; 93 struct fiq_debugger_ringbuf *tty_rbuf; 94 bool syslog_dumping; 95#endif 96 97 unsigned int last_irqs[NR_IRQS]; 98 unsigned int last_local_timer_irqs[NR_CPUS]; 99}; 100 101#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE 102struct tty_driver *fiq_tty_driver; 103#endif 104 105#ifdef CONFIG_FIQ_DEBUGGER_NO_SLEEP 106static bool initial_no_sleep = true; 107#else 108static bool initial_no_sleep; 109#endif 110 111#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE 112static bool initial_debug_enable = true; 113static bool initial_console_enable = true; 114#else 115static bool initial_debug_enable; 116static bool initial_console_enable; 117#endif 118 119static bool fiq_kgdb_enable; 120 121module_param_named(no_sleep, initial_no_sleep, bool, 0644); 122module_param_named(debug_enable, initial_debug_enable, bool, 0644); 123module_param_named(console_enable, initial_console_enable, bool, 0644); 124module_param_named(kgdb_enable, fiq_kgdb_enable, bool, 0644); 125 126#ifdef CONFIG_FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON 127static inline 128void fiq_debugger_enable_wakeup_irq(struct fiq_debugger_state *state) {} 129static inline 130void fiq_debugger_disable_wakeup_irq(struct fiq_debugger_state *state) {} 131#else 132static inline 133void fiq_debugger_enable_wakeup_irq(struct fiq_debugger_state *state) 134{ 135 if (state->wakeup_irq < 0) 136 return; 137 enable_irq(state->wakeup_irq); 138 if (!state->wakeup_irq_no_set_wake) 139 enable_irq_wake(state->wakeup_irq); 140} 141static inline 142void fiq_debugger_disable_wakeup_irq(struct fiq_debugger_state *state) 143{ 144 if (state->wakeup_irq < 0) 145 return; 146 disable_irq_nosync(state->wakeup_irq); 147 if (!state->wakeup_irq_no_set_wake) 148 disable_irq_wake(state->wakeup_irq); 149} 150#endif 151 152static inline bool fiq_debugger_have_fiq(struct fiq_debugger_state *state) 153{ 154 return (state->fiq >= 0); 155} 156 157static void fiq_debugger_force_irq(struct fiq_debugger_state *state) 158{ 159 unsigned int irq = state->signal_irq; 160 161 if (WARN_ON(!fiq_debugger_have_fiq(state))) 162 return; 163 if (state->pdata->force_irq) { 164 state->pdata->force_irq(state->pdev, irq); 165 } else { 166 struct irq_chip *chip = irq_get_chip(irq); 167 if (chip && chip->irq_retrigger) 168 chip->irq_retrigger(irq_get_irq_data(irq)); 169 } 170} 171 172static void fiq_debugger_uart_enable(struct fiq_debugger_state *state) 173{ 174 if (state->clk) 175 clk_enable(state->clk); 176 if (state->pdata->uart_enable) 177 state->pdata->uart_enable(state->pdev); 178} 179 180static void fiq_debugger_uart_disable(struct fiq_debugger_state *state) 181{ 182 if (state->pdata->uart_disable) 183 state->pdata->uart_disable(state->pdev); 184 if (state->clk) 185 clk_disable(state->clk); 186} 187 188static void fiq_debugger_uart_flush(struct fiq_debugger_state *state) 189{ 190 if (state->pdata->uart_flush) 191 state->pdata->uart_flush(state->pdev); 192} 193 194static void fiq_debugger_putc(struct fiq_debugger_state *state, char c) 195{ 196 state->pdata->uart_putc(state->pdev, c); 197} 198 199static void fiq_debugger_puts(struct fiq_debugger_state *state, char *s) 200{ 201 unsigned c; 202 while ((c = *s++)) { 203 if (c == '\n') 204 fiq_debugger_putc(state, '\r'); 205 fiq_debugger_putc(state, c); 206 } 207} 208 209static void fiq_debugger_prompt(struct fiq_debugger_state *state) 210{ 211 fiq_debugger_puts(state, "debug> "); 212} 213 214static void fiq_debugger_dump_kernel_log(struct fiq_debugger_state *state) 215{ 216 char buf[512]; 217 size_t len; 218 struct kmsg_dumper dumper = { .active = true }; 219 220 221 kmsg_dump_rewind_nolock(&dumper); 222 while (kmsg_dump_get_line_nolock(&dumper, true, buf, 223 sizeof(buf) - 1, &len)) { 224 buf[len] = 0; 225 fiq_debugger_puts(state, buf); 226 } 227} 228 229static char *mode_name(unsigned cpsr) 230{ 231 switch (cpsr & MODE_MASK) { 232 case USR_MODE: return "USR"; 233 case FIQ_MODE: return "FIQ"; 234 case IRQ_MODE: return "IRQ"; 235 case SVC_MODE: return "SVC"; 236 case ABT_MODE: return "ABT"; 237 case UND_MODE: return "UND"; 238 case SYSTEM_MODE: return "SYS"; 239 default: return "???"; 240 } 241} 242 243static int fiq_debugger_printf(void *cookie, const char *fmt, ...) 244{ 245 struct fiq_debugger_state *state = cookie; 246 char buf[256]; 247 va_list ap; 248 249 va_start(ap, fmt); 250 vsnprintf(buf, sizeof(buf), fmt, ap); 251 va_end(ap); 252 253 fiq_debugger_puts(state, buf); 254 return state->debug_abort; 255} 256 257/* Safe outside fiq context */ 258static int fiq_debugger_printf_nfiq(void *cookie, const char *fmt, ...) 259{ 260 struct fiq_debugger_state *state = cookie; 261 char buf[256]; 262 va_list ap; 263 unsigned long irq_flags; 264 265 va_start(ap, fmt); 266 vsnprintf(buf, 128, fmt, ap); 267 va_end(ap); 268 269 local_irq_save(irq_flags); 270 fiq_debugger_puts(state, buf); 271 fiq_debugger_uart_flush(state); 272 local_irq_restore(irq_flags); 273 return state->debug_abort; 274} 275 276static void fiq_debugger_dump_regs(struct fiq_debugger_state *state, 277 unsigned *regs) 278{ 279 fiq_debugger_printf(state, 280 " r0 %08x r1 %08x r2 %08x r3 %08x\n", 281 regs[0], regs[1], regs[2], regs[3]); 282 fiq_debugger_printf(state, 283 " r4 %08x r5 %08x r6 %08x r7 %08x\n", 284 regs[4], regs[5], regs[6], regs[7]); 285 fiq_debugger_printf(state, 286 " r8 %08x r9 %08x r10 %08x r11 %08x mode %s\n", 287 regs[8], regs[9], regs[10], regs[11], 288 mode_name(regs[16])); 289 if ((regs[16] & MODE_MASK) == USR_MODE) 290 fiq_debugger_printf(state, 291 " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n", 292 regs[12], regs[13], regs[14], regs[15], 293 regs[16]); 294 else 295 fiq_debugger_printf(state, 296 " ip %08x sp %08x lr %08x pc %08x cpsr %08x spsr %08x\n", 297 regs[12], regs[13], regs[14], regs[15], 298 regs[16], regs[17]); 299} 300 301struct mode_regs { 302 unsigned long sp_svc; 303 unsigned long lr_svc; 304 unsigned long spsr_svc; 305 306 unsigned long sp_abt; 307 unsigned long lr_abt; 308 unsigned long spsr_abt; 309 310 unsigned long sp_und; 311 unsigned long lr_und; 312 unsigned long spsr_und; 313 314 unsigned long sp_irq; 315 unsigned long lr_irq; 316 unsigned long spsr_irq; 317 318 unsigned long r8_fiq; 319 unsigned long r9_fiq; 320 unsigned long r10_fiq; 321 unsigned long r11_fiq; 322 unsigned long r12_fiq; 323 unsigned long sp_fiq; 324 unsigned long lr_fiq; 325 unsigned long spsr_fiq; 326}; 327 328void __naked get_mode_regs(struct mode_regs *regs) 329{ 330 asm volatile ( 331 "mrs r1, cpsr\n" 332 "msr cpsr_c, #0xd3 @(SVC_MODE | PSR_I_BIT | PSR_F_BIT)\n" 333 "stmia r0!, {r13 - r14}\n" 334 "mrs r2, spsr\n" 335 "msr cpsr_c, #0xd7 @(ABT_MODE | PSR_I_BIT | PSR_F_BIT)\n" 336 "stmia r0!, {r2, r13 - r14}\n" 337 "mrs r2, spsr\n" 338 "msr cpsr_c, #0xdb @(UND_MODE | PSR_I_BIT | PSR_F_BIT)\n" 339 "stmia r0!, {r2, r13 - r14}\n" 340 "mrs r2, spsr\n" 341 "msr cpsr_c, #0xd2 @(IRQ_MODE | PSR_I_BIT | PSR_F_BIT)\n" 342 "stmia r0!, {r2, r13 - r14}\n" 343 "mrs r2, spsr\n" 344 "msr cpsr_c, #0xd1 @(FIQ_MODE | PSR_I_BIT | PSR_F_BIT)\n" 345 "stmia r0!, {r2, r8 - r14}\n" 346 "mrs r2, spsr\n" 347 "stmia r0!, {r2}\n" 348 "msr cpsr_c, r1\n" 349 "bx lr\n"); 350} 351 352 353static void fiq_debugger_dump_allregs(struct fiq_debugger_state *state, 354 unsigned *regs) 355{ 356 struct mode_regs mode_regs; 357 fiq_debugger_dump_regs(state, regs); 358 get_mode_regs(&mode_regs); 359 fiq_debugger_printf(state, 360 " svc: sp %08x lr %08x spsr %08x\n", 361 mode_regs.sp_svc, mode_regs.lr_svc, mode_regs.spsr_svc); 362 fiq_debugger_printf(state, 363 " abt: sp %08x lr %08x spsr %08x\n", 364 mode_regs.sp_abt, mode_regs.lr_abt, mode_regs.spsr_abt); 365 fiq_debugger_printf(state, 366 " und: sp %08x lr %08x spsr %08x\n", 367 mode_regs.sp_und, mode_regs.lr_und, mode_regs.spsr_und); 368 fiq_debugger_printf(state, 369 " irq: sp %08x lr %08x spsr %08x\n", 370 mode_regs.sp_irq, mode_regs.lr_irq, mode_regs.spsr_irq); 371 fiq_debugger_printf(state, 372 " fiq: r8 %08x r9 %08x r10 %08x r11 %08x r12 %08x\n", 373 mode_regs.r8_fiq, mode_regs.r9_fiq, mode_regs.r10_fiq, 374 mode_regs.r11_fiq, mode_regs.r12_fiq); 375 fiq_debugger_printf(state, 376 " fiq: sp %08x lr %08x spsr %08x\n", 377 mode_regs.sp_fiq, mode_regs.lr_fiq, mode_regs.spsr_fiq); 378} 379 380static void fiq_debugger_dump_irqs(struct fiq_debugger_state *state) 381{ 382 int n; 383 struct irq_desc *desc; 384 385 fiq_debugger_printf(state, 386 "irqnr total since-last status name\n"); 387 for_each_irq_desc(n, desc) { 388 struct irqaction *act = desc->action; 389 if (!act && !kstat_irqs(n)) 390 continue; 391 fiq_debugger_printf(state, "%5d: %10u %11u %8x %s\n", n, 392 kstat_irqs(n), 393 kstat_irqs(n) - state->last_irqs[n], 394 desc->status_use_accessors, 395 (act && act->name) ? act->name : "???"); 396 state->last_irqs[n] = kstat_irqs(n); 397 } 398} 399 400struct stacktrace_state { 401 struct fiq_debugger_state *state; 402 unsigned int depth; 403}; 404 405static int report_trace(struct stackframe *frame, void *d) 406{ 407 struct stacktrace_state *sts = d; 408 409 if (sts->depth) { 410 fiq_debugger_printf(sts->state, 411 " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n", 412 frame->pc, frame->pc, frame->lr, frame->lr, 413 frame->sp, frame->fp); 414 sts->depth--; 415 return 0; 416 } 417 fiq_debugger_printf(sts->state, " ...\n"); 418 419 return sts->depth == 0; 420} 421 422struct frame_tail { 423 struct frame_tail *fp; 424 unsigned long sp; 425 unsigned long lr; 426} __attribute__((packed)); 427 428static struct frame_tail *user_backtrace(struct fiq_debugger_state *state, 429 struct frame_tail *tail) 430{ 431 struct frame_tail buftail[2]; 432 433 /* Also check accessibility of one struct frame_tail beyond */ 434 if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) { 435 fiq_debugger_printf(state, " invalid frame pointer %p\n", 436 tail); 437 return NULL; 438 } 439 if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail))) { 440 fiq_debugger_printf(state, 441 " failed to copy frame pointer %p\n", tail); 442 return NULL; 443 } 444 445 fiq_debugger_printf(state, " %p\n", buftail[0].lr); 446 447 /* frame pointers should strictly progress back up the stack 448 * (towards higher addresses) */ 449 if (tail >= buftail[0].fp) 450 return NULL; 451 452 return buftail[0].fp-1; 453} 454 455void fiq_debugger_dump_stacktrace(struct fiq_debugger_state *state, 456 struct pt_regs * const regs, unsigned int depth, void *ssp) 457{ 458 struct frame_tail *tail; 459 struct thread_info *real_thread_info = THREAD_INFO(ssp); 460 struct stacktrace_state sts; 461 462 sts.depth = depth; 463 sts.state = state; 464 *current_thread_info() = *real_thread_info; 465 466 if (!current) 467 fiq_debugger_printf(state, "current NULL\n"); 468 else 469 fiq_debugger_printf(state, "pid: %d comm: %s\n", 470 current->pid, current->comm); 471 fiq_debugger_dump_regs(state, (unsigned *)regs); 472 473 if (!user_mode(regs)) { 474 struct stackframe frame; 475 frame.fp = regs->ARM_fp; 476 frame.sp = regs->ARM_sp; 477 frame.lr = regs->ARM_lr; 478 frame.pc = regs->ARM_pc; 479 fiq_debugger_printf(state, 480 " pc: %p (%pF), lr %p (%pF), sp %p, fp %p\n", 481 regs->ARM_pc, regs->ARM_pc, regs->ARM_lr, regs->ARM_lr, 482 regs->ARM_sp, regs->ARM_fp); 483 walk_stackframe(&frame, report_trace, &sts); 484 return; 485 } 486 487 tail = ((struct frame_tail *) regs->ARM_fp) - 1; 488 while (depth-- && tail && !((unsigned long) tail & 3)) 489 tail = user_backtrace(state, tail); 490} 491 492static void fiq_debugger_do_ps(struct fiq_debugger_state *state) 493{ 494 struct task_struct *g; 495 struct task_struct *p; 496 unsigned task_state; 497 static const char stat_nam[] = "RSDTtZX"; 498 499 fiq_debugger_printf(state, "pid ppid prio task pc\n"); 500 read_lock(&tasklist_lock); 501 do_each_thread(g, p) { 502 task_state = p->state ? __ffs(p->state) + 1 : 0; 503 fiq_debugger_printf(state, 504 "%5d %5d %4d ", p->pid, p->parent->pid, p->prio); 505 fiq_debugger_printf(state, "%-13.13s %c", p->comm, 506 task_state >= sizeof(stat_nam) ? '?' : stat_nam[task_state]); 507 if (task_state == TASK_RUNNING) 508 fiq_debugger_printf(state, " running\n"); 509 else 510 fiq_debugger_printf(state, " %08lx\n", 511 thread_saved_pc(p)); 512 } while_each_thread(g, p); 513 read_unlock(&tasklist_lock); 514} 515 516#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE 517static void fiq_debugger_begin_syslog_dump(struct fiq_debugger_state *state) 518{ 519 state->syslog_dumping = true; 520} 521 522static void fiq_debugger_end_syslog_dump(struct fiq_debugger_state *state) 523{ 524 state->syslog_dumping = false; 525} 526#else 527extern int do_syslog(int type, char __user *bug, int count); 528static void fiq_debugger_begin_syslog_dump(struct fiq_debugger_state *state) 529{ 530 do_syslog(5 /* clear */, NULL, 0); 531} 532 533static void fiq_debugger_end_syslog_dump(struct fiq_debugger_state *state) 534{ 535 fiq_debugger_dump_kernel_log(state); 536} 537#endif 538 539static void fiq_debugger_do_sysrq(struct fiq_debugger_state *state, char rq) 540{ 541 if ((rq == 'g' || rq == 'G') && !fiq_kgdb_enable) { 542 fiq_debugger_printf(state, "sysrq-g blocked\n"); 543 return; 544 } 545 fiq_debugger_begin_syslog_dump(state); 546 handle_sysrq(rq); 547 fiq_debugger_end_syslog_dump(state); 548} 549 550#ifdef CONFIG_KGDB 551static void fiq_debugger_do_kgdb(struct fiq_debugger_state *state) 552{ 553 if (!fiq_kgdb_enable) { 554 fiq_debugger_printf(state, "kgdb through fiq debugger not enabled\n"); 555 return; 556 } 557 558 fiq_debugger_printf(state, "enabling console and triggering kgdb\n"); 559 state->console_enable = true; 560 handle_sysrq('g'); 561} 562#endif 563 564static void fiq_debugger_schedule_work(struct fiq_debugger_state *state, 565 char *cmd) 566{ 567 unsigned long flags; 568 569 spin_lock_irqsave(&state->work_lock, flags); 570 if (state->work_cmd[0] != '\0') { 571 fiq_debugger_printf(state, "work command processor busy\n"); 572 spin_unlock_irqrestore(&state->work_lock, flags); 573 return; 574 } 575 576 strlcpy(state->work_cmd, cmd, sizeof(state->work_cmd)); 577 spin_unlock_irqrestore(&state->work_lock, flags); 578 579 schedule_work(&state->work); 580} 581 582static void fiq_debugger_work(struct work_struct *work) 583{ 584 struct fiq_debugger_state *state; 585 char work_cmd[DEBUG_MAX]; 586 char *cmd; 587 unsigned long flags; 588 589 state = container_of(work, struct fiq_debugger_state, work); 590 591 spin_lock_irqsave(&state->work_lock, flags); 592 593 strlcpy(work_cmd, state->work_cmd, sizeof(work_cmd)); 594 state->work_cmd[0] = '\0'; 595 596 spin_unlock_irqrestore(&state->work_lock, flags); 597 598 cmd = work_cmd; 599 if (!strncmp(cmd, "reboot", 6)) { 600 cmd += 6; 601 while (*cmd == ' ') 602 cmd++; 603 if (cmd != '\0') 604 kernel_restart(cmd); 605 else 606 kernel_restart(NULL); 607 } else { 608 fiq_debugger_printf(state, "unknown work command '%s'\n", 609 work_cmd); 610 } 611} 612 613/* This function CANNOT be called in FIQ context */ 614static void fiq_debugger_irq_exec(struct fiq_debugger_state *state, char *cmd) 615{ 616 if (!strcmp(cmd, "ps")) 617 fiq_debugger_do_ps(state); 618 if (!strcmp(cmd, "sysrq")) 619 fiq_debugger_do_sysrq(state, 'h'); 620 if (!strncmp(cmd, "sysrq ", 6)) 621 fiq_debugger_do_sysrq(state, cmd[6]); 622#ifdef CONFIG_KGDB 623 if (!strcmp(cmd, "kgdb")) 624 fiq_debugger_do_kgdb(state); 625#endif 626 if (!strncmp(cmd, "reboot", 6)) 627 fiq_debugger_schedule_work(state, cmd); 628} 629 630static void fiq_debugger_help(struct fiq_debugger_state *state) 631{ 632 fiq_debugger_printf(state, 633 "FIQ Debugger commands:\n" 634 " pc PC status\n" 635 " regs Register dump\n" 636 " allregs Extended Register dump\n" 637 " bt Stack trace\n" 638 " reboot [<c>] Reboot with command <c>\n" 639 " reset [<c>] Hard reset with command <c>\n" 640 " irqs Interupt status\n" 641 " kmsg Kernel log\n" 642 " version Kernel version\n"); 643 fiq_debugger_printf(state, 644 " sleep Allow sleep while in FIQ\n" 645 " nosleep Disable sleep while in FIQ\n" 646 " console Switch terminal to console\n" 647 " cpu Current CPU\n" 648 " cpu <number> Switch to CPU<number>\n"); 649 fiq_debugger_printf(state, 650 " ps Process list\n" 651 " sysrq sysrq options\n" 652 " sysrq <param> Execute sysrq with <param>\n"); 653#ifdef CONFIG_KGDB 654 fiq_debugger_printf(state, 655 " kgdb Enter kernel debugger\n"); 656#endif 657} 658 659static void fiq_debugger_take_affinity(void *info) 660{ 661 struct fiq_debugger_state *state = info; 662 struct cpumask cpumask; 663 664 cpumask_clear(&cpumask); 665 cpumask_set_cpu(get_cpu(), &cpumask); 666 667 irq_set_affinity(state->uart_irq, &cpumask); 668} 669 670static void fiq_debugger_switch_cpu(struct fiq_debugger_state *state, int cpu) 671{ 672 if (!fiq_debugger_have_fiq(state)) 673 smp_call_function_single(cpu, fiq_debugger_take_affinity, state, 674 false); 675 state->current_cpu = cpu; 676} 677 678static bool fiq_debugger_fiq_exec(struct fiq_debugger_state *state, 679 const char *cmd, unsigned *regs, void *svc_sp) 680{ 681 bool signal_helper = false; 682 683 if (!strcmp(cmd, "help") || !strcmp(cmd, "?")) { 684 fiq_debugger_help(state); 685 } else if (!strcmp(cmd, "pc")) { 686 fiq_debugger_printf(state, " pc %08x cpsr %08x mode %s\n", 687 regs[15], regs[16], mode_name(regs[16])); 688 } else if (!strcmp(cmd, "regs")) { 689 fiq_debugger_dump_regs(state, regs); 690 } else if (!strcmp(cmd, "allregs")) { 691 fiq_debugger_dump_allregs(state, regs); 692 } else if (!strcmp(cmd, "bt")) { 693 fiq_debugger_dump_stacktrace(state, (struct pt_regs *)regs, 100, 694 svc_sp); 695 } else if (!strncmp(cmd, "reset", 5)) { 696 cmd += 5; 697 while (*cmd == ' ') 698 cmd++; 699 if (*cmd) { 700 char tmp_cmd[32]; 701 strlcpy(tmp_cmd, cmd, sizeof(tmp_cmd)); 702 machine_restart(tmp_cmd); 703 } else { 704 machine_restart(NULL); 705 } 706 } else if (!strcmp(cmd, "irqs")) { 707 fiq_debugger_dump_irqs(state); 708 } else if (!strcmp(cmd, "kmsg")) { 709 fiq_debugger_dump_kernel_log(state); 710 } else if (!strcmp(cmd, "version")) { 711 fiq_debugger_printf(state, "%s\n", linux_banner); 712 } else if (!strcmp(cmd, "sleep")) { 713 state->no_sleep = false; 714 fiq_debugger_printf(state, "enabling sleep\n"); 715 } else if (!strcmp(cmd, "nosleep")) { 716 state->no_sleep = true; 717 fiq_debugger_printf(state, "disabling sleep\n"); 718 } else if (!strcmp(cmd, "console")) { 719 fiq_debugger_printf(state, "console mode\n"); 720 fiq_debugger_uart_flush(state); 721 state->console_enable = true; 722 } else if (!strcmp(cmd, "cpu")) { 723 fiq_debugger_printf(state, "cpu %d\n", state->current_cpu); 724 } else if (!strncmp(cmd, "cpu ", 4)) { 725 unsigned long cpu = 0; 726 if (strict_strtoul(cmd + 4, 10, &cpu) == 0) 727 fiq_debugger_switch_cpu(state, cpu); 728 else 729 fiq_debugger_printf(state, "invalid cpu\n"); 730 fiq_debugger_printf(state, "cpu %d\n", state->current_cpu); 731 } else { 732 if (state->debug_busy) { 733 fiq_debugger_printf(state, 734 "command processor busy. trying to abort.\n"); 735 state->debug_abort = -1; 736 } else { 737 strcpy(state->debug_cmd, cmd); 738 state->debug_busy = 1; 739 } 740 741 return true; 742 } 743 if (!state->console_enable) 744 fiq_debugger_prompt(state); 745 746 return signal_helper; 747} 748 749static void fiq_debugger_sleep_timer_expired(unsigned long data) 750{ 751 struct fiq_debugger_state *state = (struct fiq_debugger_state *)data; 752 unsigned long flags; 753 754 spin_lock_irqsave(&state->sleep_timer_lock, flags); 755 if (state->uart_enabled && !state->no_sleep) { 756 if (state->debug_enable && !state->console_enable) { 757 state->debug_enable = false; 758 fiq_debugger_printf_nfiq(state, 759 "suspending fiq debugger\n"); 760 } 761 state->ignore_next_wakeup_irq = true; 762 fiq_debugger_uart_disable(state); 763 state->uart_enabled = false; 764 fiq_debugger_enable_wakeup_irq(state); 765 } 766 wake_unlock(&state->debugger_wake_lock); 767 spin_unlock_irqrestore(&state->sleep_timer_lock, flags); 768} 769 770static void fiq_debugger_handle_wakeup(struct fiq_debugger_state *state) 771{ 772 unsigned long flags; 773 774 spin_lock_irqsave(&state->sleep_timer_lock, flags); 775 if (state->wakeup_irq >= 0 && state->ignore_next_wakeup_irq) { 776 state->ignore_next_wakeup_irq = false; 777 } else if (!state->uart_enabled) { 778 wake_lock(&state->debugger_wake_lock); 779 fiq_debugger_uart_enable(state); 780 state->uart_enabled = true; 781 fiq_debugger_disable_wakeup_irq(state); 782 mod_timer(&state->sleep_timer, jiffies + HZ / 2); 783 } 784 spin_unlock_irqrestore(&state->sleep_timer_lock, flags); 785} 786 787static irqreturn_t fiq_debugger_wakeup_irq_handler(int irq, void *dev) 788{ 789 struct fiq_debugger_state *state = dev; 790 791 if (!state->no_sleep) 792 fiq_debugger_puts(state, "WAKEUP\n"); 793 fiq_debugger_handle_wakeup(state); 794 795 return IRQ_HANDLED; 796} 797 798static 799void fiq_debugger_handle_console_irq_context(struct fiq_debugger_state *state) 800{ 801#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) 802 if (state->tty_port.ops) { 803 int i; 804 int count = fiq_debugger_ringbuf_level(state->tty_rbuf); 805 for (i = 0; i < count; i++) { 806 int c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0); 807 tty_insert_flip_char(&state->tty_port, c, TTY_NORMAL); 808 if (!fiq_debugger_ringbuf_consume(state->tty_rbuf, 1)) 809 pr_warn("fiq tty failed to consume byte\n"); 810 } 811 tty_flip_buffer_push(&state->tty_port); 812 } 813#endif 814} 815 816static void fiq_debugger_handle_irq_context(struct fiq_debugger_state *state) 817{ 818 if (!state->no_sleep) { 819 unsigned long flags; 820 821 spin_lock_irqsave(&state->sleep_timer_lock, flags); 822 wake_lock(&state->debugger_wake_lock); 823 mod_timer(&state->sleep_timer, jiffies + HZ * 5); 824 spin_unlock_irqrestore(&state->sleep_timer_lock, flags); 825 } 826 fiq_debugger_handle_console_irq_context(state); 827 if (state->debug_busy) { 828 fiq_debugger_irq_exec(state, state->debug_cmd); 829 if (!state->console_enable) 830 fiq_debugger_prompt(state); 831 state->debug_busy = 0; 832 } 833} 834 835static int fiq_debugger_getc(struct fiq_debugger_state *state) 836{ 837 return state->pdata->uart_getc(state->pdev); 838} 839 840static bool fiq_debugger_handle_uart_interrupt(struct fiq_debugger_state *state, 841 int this_cpu, struct pt_regs *regs, void *svc_sp) 842{ 843 int c; 844 static int last_c; 845 int count = 0; 846 bool signal_helper = false; 847 848 if (this_cpu != state->current_cpu) { 849 if (state->in_fiq) 850 return false; 851 852 if (atomic_inc_return(&state->unhandled_fiq_count) != 853 MAX_UNHANDLED_FIQ_COUNT) 854 return false; 855 856 fiq_debugger_printf(state, 857 "fiq_debugger: cpu %d not responding, " 858 "reverting to cpu %d\n", state->current_cpu, 859 this_cpu); 860 861 atomic_set(&state->unhandled_fiq_count, 0); 862 fiq_debugger_switch_cpu(state, this_cpu); 863 return false; 864 } 865 866 state->in_fiq = true; 867 868 while ((c = fiq_debugger_getc(state)) != FIQ_DEBUGGER_NO_CHAR) { 869 count++; 870 if (!state->debug_enable) { 871 if ((c == 13) || (c == 10)) { 872 state->debug_enable = true; 873 state->debug_count = 0; 874 fiq_debugger_prompt(state); 875 } 876 } else if (c == FIQ_DEBUGGER_BREAK) { 877 state->console_enable = false; 878 fiq_debugger_puts(state, "fiq debugger mode\n"); 879 state->debug_count = 0; 880 fiq_debugger_prompt(state); 881#ifdef CONFIG_FIQ_DEBUGGER_CONSOLE 882 } else if (state->console_enable && state->tty_rbuf) { 883 fiq_debugger_ringbuf_push(state->tty_rbuf, c); 884 signal_helper = true; 885#endif 886 } else if ((c >= ' ') && (c < 127)) { 887 if (state->debug_count < (DEBUG_MAX - 1)) { 888 state->debug_buf[state->debug_count++] = c; 889 fiq_debugger_putc(state, c); 890 } 891 } else if ((c == 8) || (c == 127)) { 892 if (state->debug_count > 0) { 893 state->debug_count--; 894 fiq_debugger_putc(state, 8); 895 fiq_debugger_putc(state, ' '); 896 fiq_debugger_putc(state, 8); 897 } 898 } else if ((c == 13) || (c == 10)) { 899 if (c == '\r' || (c == '\n' && last_c != '\r')) { 900 fiq_debugger_putc(state, '\r'); 901 fiq_debugger_putc(state, '\n'); 902 } 903 if (state->debug_count) { 904 state->debug_buf[state->debug_count] = 0; 905 state->debug_count = 0; 906 signal_helper |= 907 fiq_debugger_fiq_exec(state, 908 state->debug_buf, 909 regs, svc_sp); 910 } else { 911 fiq_debugger_prompt(state); 912 } 913 } 914 last_c = c; 915 } 916 if (!state->console_enable) 917 fiq_debugger_uart_flush(state); 918 if (state->pdata->fiq_ack) 919 state->pdata->fiq_ack(state->pdev, state->fiq); 920 921 /* poke sleep timer if necessary */ 922 if (state->debug_enable && !state->no_sleep) 923 signal_helper = true; 924 925 atomic_set(&state->unhandled_fiq_count, 0); 926 state->in_fiq = false; 927 928 return signal_helper; 929} 930 931static void fiq_debugger_fiq(struct fiq_glue_handler *h, void *regs, 932 void *svc_sp) 933{ 934 struct fiq_debugger_state *state = 935 container_of(h, struct fiq_debugger_state, handler); 936 unsigned int this_cpu = THREAD_INFO(svc_sp)->cpu; 937 bool need_irq; 938 939 need_irq = fiq_debugger_handle_uart_interrupt(state, this_cpu, regs, 940 svc_sp); 941 if (need_irq) 942 fiq_debugger_force_irq(state); 943} 944 945/* 946 * When not using FIQs, we only use this single interrupt as an entry point. 947 * This just effectively takes over the UART interrupt and does all the work 948 * in this context. 949 */ 950static irqreturn_t fiq_debugger_uart_irq(int irq, void *dev) 951{ 952 struct fiq_debugger_state *state = dev; 953 bool not_done; 954 955 fiq_debugger_handle_wakeup(state); 956 957 /* handle the debugger irq in regular context */ 958 not_done = fiq_debugger_handle_uart_interrupt(state, smp_processor_id(), 959 get_irq_regs(), 960 current_thread_info()); 961 if (not_done) 962 fiq_debugger_handle_irq_context(state); 963 964 return IRQ_HANDLED; 965} 966 967/* 968 * If FIQs are used, not everything can happen in fiq context. 969 * FIQ handler does what it can and then signals this interrupt to finish the 970 * job in irq context. 971 */ 972static irqreturn_t fiq_debugger_signal_irq(int irq, void *dev) 973{ 974 struct fiq_debugger_state *state = dev; 975 976 if (state->pdata->force_irq_ack) 977 state->pdata->force_irq_ack(state->pdev, state->signal_irq); 978 979 fiq_debugger_handle_irq_context(state); 980 981 return IRQ_HANDLED; 982} 983 984static void fiq_debugger_resume(struct fiq_glue_handler *h) 985{ 986 struct fiq_debugger_state *state = 987 container_of(h, struct fiq_debugger_state, handler); 988 if (state->pdata->uart_resume) 989 state->pdata->uart_resume(state->pdev); 990} 991 992#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) 993struct tty_driver *fiq_debugger_console_device(struct console *co, int *index) 994{ 995 *index = co->index; 996 return fiq_tty_driver; 997} 998 999static void fiq_debugger_console_write(struct console *co, 1000 const char *s, unsigned int count) 1001{ 1002 struct fiq_debugger_state *state; 1003 unsigned long flags; 1004 1005 state = container_of(co, struct fiq_debugger_state, console); 1006 1007 if (!state->console_enable && !state->syslog_dumping) 1008 return; 1009 1010 fiq_debugger_uart_enable(state); 1011 spin_lock_irqsave(&state->console_lock, flags); 1012 while (count--) { 1013 if (*s == '\n') 1014 fiq_debugger_putc(state, '\r'); 1015 fiq_debugger_putc(state, *s++); 1016 } 1017 fiq_debugger_uart_flush(state); 1018 spin_unlock_irqrestore(&state->console_lock, flags); 1019 fiq_debugger_uart_disable(state); 1020} 1021 1022static struct console fiq_debugger_console = { 1023 .name = "ttyFIQ", 1024 .device = fiq_debugger_console_device, 1025 .write = fiq_debugger_console_write, 1026 .flags = CON_PRINTBUFFER | CON_ANYTIME | CON_ENABLED, 1027}; 1028 1029int fiq_tty_open(struct tty_struct *tty, struct file *filp) 1030{ 1031 int line = tty->index; 1032 struct fiq_debugger_state **states = tty->driver->driver_state; 1033 struct fiq_debugger_state *state = states[line]; 1034 1035 return tty_port_open(&state->tty_port, tty, filp); 1036} 1037 1038void fiq_tty_close(struct tty_struct *tty, struct file *filp) 1039{ 1040 tty_port_close(tty->port, tty, filp); 1041} 1042 1043int fiq_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) 1044{ 1045 int i; 1046 int line = tty->index; 1047 struct fiq_debugger_state **states = tty->driver->driver_state; 1048 struct fiq_debugger_state *state = states[line]; 1049 1050 if (!state->console_enable) 1051 return count; 1052 1053 fiq_debugger_uart_enable(state); 1054 spin_lock_irq(&state->console_lock); 1055 for (i = 0; i < count; i++) 1056 fiq_debugger_putc(state, *buf++); 1057 spin_unlock_irq(&state->console_lock); 1058 fiq_debugger_uart_disable(state); 1059 1060 return count; 1061} 1062 1063int fiq_tty_write_room(struct tty_struct *tty) 1064{ 1065 return 16; 1066} 1067 1068#ifdef CONFIG_CONSOLE_POLL 1069static int fiq_tty_poll_init(struct tty_driver *driver, int line, char *options) 1070{ 1071 return 0; 1072} 1073 1074static int fiq_tty_poll_get_char(struct tty_driver *driver, int line) 1075{ 1076 struct fiq_debugger_state **states = driver->driver_state; 1077 struct fiq_debugger_state *state = states[line]; 1078 int c = NO_POLL_CHAR; 1079 1080 fiq_debugger_uart_enable(state); 1081 if (fiq_debugger_have_fiq(state)) { 1082 int count = fiq_debugger_ringbuf_level(state->tty_rbuf); 1083 if (count > 0) { 1084 c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0); 1085 fiq_debugger_ringbuf_consume(state->tty_rbuf, 1); 1086 } 1087 } else { 1088 c = fiq_debugger_getc(state); 1089 if (c == FIQ_DEBUGGER_NO_CHAR) 1090 c = NO_POLL_CHAR; 1091 } 1092 fiq_debugger_uart_disable(state); 1093 1094 return c; 1095} 1096 1097static void fiq_tty_poll_put_char(struct tty_driver *driver, int line, char ch) 1098{ 1099 struct fiq_debugger_state **states = driver->driver_state; 1100 struct fiq_debugger_state *state = states[line]; 1101 fiq_debugger_uart_enable(state); 1102 fiq_debugger_putc(state, ch); 1103 fiq_debugger_uart_disable(state); 1104} 1105#endif 1106 1107static const struct tty_port_operations fiq_tty_port_ops; 1108 1109static const struct tty_operations fiq_tty_driver_ops = { 1110 .write = fiq_tty_write, 1111 .write_room = fiq_tty_write_room, 1112 .open = fiq_tty_open, 1113 .close = fiq_tty_close, 1114#ifdef CONFIG_CONSOLE_POLL 1115 .poll_init = fiq_tty_poll_init, 1116 .poll_get_char = fiq_tty_poll_get_char, 1117 .poll_put_char = fiq_tty_poll_put_char, 1118#endif 1119}; 1120 1121static int fiq_debugger_tty_init(void) 1122{ 1123 int ret; 1124 struct fiq_debugger_state **states = NULL; 1125 1126 states = kzalloc(sizeof(*states) * MAX_FIQ_DEBUGGER_PORTS, GFP_KERNEL); 1127 if (!states) { 1128 pr_err("Failed to allocate fiq debugger state structres\n"); 1129 return -ENOMEM; 1130 } 1131 1132 fiq_tty_driver = alloc_tty_driver(MAX_FIQ_DEBUGGER_PORTS); 1133 if (!fiq_tty_driver) { 1134 pr_err("Failed to allocate fiq debugger tty\n"); 1135 ret = -ENOMEM; 1136 goto err_free_state; 1137 } 1138 1139 fiq_tty_driver->owner = THIS_MODULE; 1140 fiq_tty_driver->driver_name = "fiq-debugger"; 1141 fiq_tty_driver->name = "ttyFIQ"; 1142 fiq_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; 1143 fiq_tty_driver->subtype = SERIAL_TYPE_NORMAL; 1144 fiq_tty_driver->init_termios = tty_std_termios; 1145 fiq_tty_driver->flags = TTY_DRIVER_REAL_RAW | 1146 TTY_DRIVER_DYNAMIC_DEV; 1147 fiq_tty_driver->driver_state = states; 1148 1149 fiq_tty_driver->init_termios.c_cflag = 1150 B115200 | CS8 | CREAD | HUPCL | CLOCAL; 1151 fiq_tty_driver->init_termios.c_ispeed = 115200; 1152 fiq_tty_driver->init_termios.c_ospeed = 115200; 1153 1154 tty_set_operations(fiq_tty_driver, &fiq_tty_driver_ops); 1155 1156 ret = tty_register_driver(fiq_tty_driver); 1157 if (ret) { 1158 pr_err("Failed to register fiq tty: %d\n", ret); 1159 goto err_free_tty; 1160 } 1161 1162 pr_info("Registered FIQ tty driver\n"); 1163 return 0; 1164 1165err_free_tty: 1166 put_tty_driver(fiq_tty_driver); 1167 fiq_tty_driver = NULL; 1168err_free_state: 1169 kfree(states); 1170 return ret; 1171} 1172 1173static int fiq_debugger_tty_init_one(struct fiq_debugger_state *state) 1174{ 1175 int ret; 1176 struct device *tty_dev; 1177 struct fiq_debugger_state **states = fiq_tty_driver->driver_state; 1178 1179 states[state->pdev->id] = state; 1180 1181 state->tty_rbuf = fiq_debugger_ringbuf_alloc(1024); 1182 if (!state->tty_rbuf) { 1183 pr_err("Failed to allocate fiq debugger ringbuf\n"); 1184 ret = -ENOMEM; 1185 goto err; 1186 } 1187 1188 tty_port_init(&state->tty_port); 1189 state->tty_port.ops = &fiq_tty_port_ops; 1190 1191 tty_dev = tty_port_register_device(&state->tty_port, fiq_tty_driver, 1192 state->pdev->id, &state->pdev->dev); 1193 if (IS_ERR(tty_dev)) { 1194 pr_err("Failed to register fiq debugger tty device\n"); 1195 ret = PTR_ERR(tty_dev); 1196 goto err; 1197 } 1198 1199 device_set_wakeup_capable(tty_dev, 1); 1200 1201 pr_info("Registered fiq debugger ttyFIQ%d\n", state->pdev->id); 1202 1203 return 0; 1204 1205err: 1206 fiq_debugger_ringbuf_free(state->tty_rbuf); 1207 state->tty_rbuf = NULL; 1208 return ret; 1209} 1210#endif 1211 1212static int fiq_debugger_dev_suspend(struct device *dev) 1213{ 1214 struct platform_device *pdev = to_platform_device(dev); 1215 struct fiq_debugger_state *state = platform_get_drvdata(pdev); 1216 1217 if (state->pdata->uart_dev_suspend) 1218 return state->pdata->uart_dev_suspend(pdev); 1219 return 0; 1220} 1221 1222static int fiq_debugger_dev_resume(struct device *dev) 1223{ 1224 struct platform_device *pdev = to_platform_device(dev); 1225 struct fiq_debugger_state *state = platform_get_drvdata(pdev); 1226 1227 if (state->pdata->uart_dev_resume) 1228 return state->pdata->uart_dev_resume(pdev); 1229 return 0; 1230} 1231 1232static int fiq_debugger_probe(struct platform_device *pdev) 1233{ 1234 int ret; 1235 struct fiq_debugger_pdata *pdata = dev_get_platdata(&pdev->dev); 1236 struct fiq_debugger_state *state; 1237 int fiq; 1238 int uart_irq; 1239 1240 if (pdev->id >= MAX_FIQ_DEBUGGER_PORTS) 1241 return -EINVAL; 1242 1243 if (!pdata->uart_getc || !pdata->uart_putc) 1244 return -EINVAL; 1245 if ((pdata->uart_enable && !pdata->uart_disable) || 1246 (!pdata->uart_enable && pdata->uart_disable)) 1247 return -EINVAL; 1248 1249 fiq = platform_get_irq_byname(pdev, "fiq"); 1250 uart_irq = platform_get_irq_byname(pdev, "uart_irq"); 1251 1252 /* uart_irq mode and fiq mode are mutually exclusive, but one of them 1253 * is required */ 1254 if ((uart_irq < 0 && fiq < 0) || (uart_irq >= 0 && fiq >= 0)) 1255 return -EINVAL; 1256 if (fiq >= 0 && !pdata->fiq_enable) 1257 return -EINVAL; 1258 1259 state = kzalloc(sizeof(*state), GFP_KERNEL); 1260 setup_timer(&state->sleep_timer, fiq_debugger_sleep_timer_expired, 1261 (unsigned long)state); 1262 state->pdata = pdata; 1263 state->pdev = pdev; 1264 state->no_sleep = initial_no_sleep; 1265 state->debug_enable = initial_debug_enable; 1266 state->console_enable = initial_console_enable; 1267 1268 state->fiq = fiq; 1269 state->uart_irq = uart_irq; 1270 state->signal_irq = platform_get_irq_byname(pdev, "signal"); 1271 state->wakeup_irq = platform_get_irq_byname(pdev, "wakeup"); 1272 1273 INIT_WORK(&state->work, fiq_debugger_work); 1274 spin_lock_init(&state->work_lock); 1275 1276 platform_set_drvdata(pdev, state); 1277 1278 spin_lock_init(&state->sleep_timer_lock); 1279 1280 if (state->wakeup_irq < 0 && fiq_debugger_have_fiq(state)) 1281 state->no_sleep = true; 1282 state->ignore_next_wakeup_irq = !state->no_sleep; 1283 1284 wake_lock_init(&state->debugger_wake_lock, 1285 WAKE_LOCK_SUSPEND, "serial-debug"); 1286 1287 state->clk = clk_get(&pdev->dev, NULL); 1288 if (IS_ERR(state->clk)) 1289 state->clk = NULL; 1290 1291 /* do not call pdata->uart_enable here since uart_init may still 1292 * need to do some initialization before uart_enable can work. 1293 * So, only try to manage the clock during init. 1294 */ 1295 if (state->clk) 1296 clk_enable(state->clk); 1297 1298 if (pdata->uart_init) { 1299 ret = pdata->uart_init(pdev); 1300 if (ret) 1301 goto err_uart_init; 1302 } 1303 1304 fiq_debugger_printf_nfiq(state, 1305 "<hit enter %sto activate fiq debugger>\n", 1306 state->no_sleep ? "" : "twice "); 1307 1308 if (fiq_debugger_have_fiq(state)) { 1309 state->handler.fiq = fiq_debugger_fiq; 1310 state->handler.resume = fiq_debugger_resume; 1311 ret = fiq_glue_register_handler(&state->handler); 1312 if (ret) { 1313 pr_err("%s: could not install fiq handler\n", __func__); 1314 goto err_register_fiq; 1315 } 1316 1317 pdata->fiq_enable(pdev, state->fiq, 1); 1318 } else { 1319 ret = request_irq(state->uart_irq, fiq_debugger_uart_irq, 1320 IRQF_NO_SUSPEND, "debug", state); 1321 if (ret) { 1322 pr_err("%s: could not install irq handler\n", __func__); 1323 goto err_register_irq; 1324 } 1325 1326 /* for irq-only mode, we want this irq to wake us up, if it 1327 * can. 1328 */ 1329 enable_irq_wake(state->uart_irq); 1330 } 1331 1332 if (state->clk) 1333 clk_disable(state->clk); 1334 1335 if (state->signal_irq >= 0) { 1336 ret = request_irq(state->signal_irq, fiq_debugger_signal_irq, 1337 IRQF_TRIGGER_RISING, "debug-signal", state); 1338 if (ret) 1339 pr_err("serial_debugger: could not install signal_irq"); 1340 } 1341 1342 if (state->wakeup_irq >= 0) { 1343 ret = request_irq(state->wakeup_irq, 1344 fiq_debugger_wakeup_irq_handler, 1345 IRQF_TRIGGER_FALLING | IRQF_DISABLED, 1346 "debug-wakeup", state); 1347 if (ret) { 1348 pr_err("serial_debugger: " 1349 "could not install wakeup irq\n"); 1350 state->wakeup_irq = -1; 1351 } else { 1352 ret = enable_irq_wake(state->wakeup_irq); 1353 if (ret) { 1354 pr_err("serial_debugger: " 1355 "could not enable wakeup\n"); 1356 state->wakeup_irq_no_set_wake = true; 1357 } 1358 } 1359 } 1360 if (state->no_sleep) 1361 fiq_debugger_handle_wakeup(state); 1362 1363#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) 1364 spin_lock_init(&state->console_lock); 1365 state->console = fiq_debugger_console; 1366 state->console.index = pdev->id; 1367 if (!console_set_on_cmdline) 1368 add_preferred_console(state->console.name, 1369 state->console.index, NULL); 1370 register_console(&state->console); 1371 fiq_debugger_tty_init_one(state); 1372#endif 1373 return 0; 1374 1375err_register_irq: 1376err_register_fiq: 1377 if (pdata->uart_free) 1378 pdata->uart_free(pdev); 1379err_uart_init: 1380 if (state->clk) 1381 clk_disable(state->clk); 1382 if (state->clk) 1383 clk_put(state->clk); 1384 wake_lock_destroy(&state->debugger_wake_lock); 1385 platform_set_drvdata(pdev, NULL); 1386 kfree(state); 1387 return ret; 1388} 1389 1390static const struct dev_pm_ops fiq_debugger_dev_pm_ops = { 1391 .suspend = fiq_debugger_dev_suspend, 1392 .resume = fiq_debugger_dev_resume, 1393}; 1394 1395static struct platform_driver fiq_debugger_driver = { 1396 .probe = fiq_debugger_probe, 1397 .driver = { 1398 .name = "fiq_debugger", 1399 .pm = &fiq_debugger_dev_pm_ops, 1400 }, 1401}; 1402 1403static int __init fiq_debugger_init(void) 1404{ 1405#if defined(CONFIG_FIQ_DEBUGGER_CONSOLE) 1406 fiq_debugger_tty_init(); 1407#endif 1408 return platform_driver_register(&fiq_debugger_driver); 1409} 1410 1411postcore_initcall(fiq_debugger_init); 1412