2 * drivers/staging/android/fiq_debugger.c
4 * Serial Debugger Interface accessed through an FIQ interrupt.
6 * Copyright (C) 2008 Google, Inc.
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.
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.
19 #include <linux/module.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>
38 #ifdef CONFIG_FIQ_GLUE
39 #include <asm/fiq_glue.h>
42 #ifdef CONFIG_FIQ_DEBUGGER_UART_OVERLAY
46 #include <linux/uaccess.h>
48 #include "fiq_debugger.h"
49 #include "fiq_debugger_priv.h"
50 #include "fiq_debugger_ringbuf.h"
53 #define MAX_UNHANDLED_FIQ_COUNT 1000000
55 #define MAX_FIQ_DEBUGGER_PORTS 4
57 struct fiq_debugger_state {
58 #ifdef CONFIG_FIQ_GLUE
59 struct fiq_glue_handler handler;
61 struct fiq_debugger_output output;
67 bool wakeup_irq_no_set_wake;
69 struct fiq_debugger_pdata *pdata;
70 struct platform_device *pdev;
72 char debug_cmd[DEBUG_MAX];
76 char debug_buf[DEBUG_MAX];
81 bool ignore_next_wakeup_irq;
82 struct timer_list sleep_timer;
83 spinlock_t sleep_timer_lock;
85 struct wake_lock debugger_wake_lock;
88 atomic_t unhandled_fiq_count;
91 struct work_struct work;
93 char work_cmd[DEBUG_MAX];
95 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
96 spinlock_t console_lock;
97 struct console console;
98 struct tty_port tty_port;
99 struct fiq_debugger_ringbuf *tty_rbuf;
103 unsigned int last_irqs[NR_IRQS];
104 unsigned int last_local_timer_irqs[NR_CPUS];
107 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
108 struct tty_driver *fiq_tty_driver;
111 #ifdef CONFIG_FIQ_DEBUGGER_NO_SLEEP
112 static bool initial_no_sleep = true;
114 static bool initial_no_sleep;
117 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE
118 static bool initial_debug_enable = true;
119 static bool initial_console_enable = true;
121 static bool initial_debug_enable;
122 static bool initial_console_enable;
125 static bool fiq_kgdb_enable;
126 static bool fiq_debugger_disable;
128 module_param_named(no_sleep, initial_no_sleep, bool, 0644);
129 module_param_named(debug_enable, initial_debug_enable, bool, 0644);
130 module_param_named(console_enable, initial_console_enable, bool, 0644);
131 module_param_named(kgdb_enable, fiq_kgdb_enable, bool, 0644);
132 module_param_named(disable, fiq_debugger_disable, bool, 0644);
134 #ifdef CONFIG_FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON
136 void fiq_debugger_enable_wakeup_irq(struct fiq_debugger_state *state) {}
138 void fiq_debugger_disable_wakeup_irq(struct fiq_debugger_state *state) {}
141 void fiq_debugger_enable_wakeup_irq(struct fiq_debugger_state *state)
143 if (state->wakeup_irq < 0)
145 enable_irq(state->wakeup_irq);
146 if (!state->wakeup_irq_no_set_wake)
147 enable_irq_wake(state->wakeup_irq);
150 void fiq_debugger_disable_wakeup_irq(struct fiq_debugger_state *state)
152 if (state->wakeup_irq < 0)
154 disable_irq_nosync(state->wakeup_irq);
155 if (!state->wakeup_irq_no_set_wake)
156 disable_irq_wake(state->wakeup_irq);
160 static inline bool fiq_debugger_have_fiq(struct fiq_debugger_state *state)
162 return (state->fiq >= 0);
165 #ifdef CONFIG_FIQ_GLUE
166 static void fiq_debugger_force_irq(struct fiq_debugger_state *state)
168 unsigned int irq = state->signal_irq;
170 if (WARN_ON(!fiq_debugger_have_fiq(state)))
172 if (state->pdata->force_irq) {
173 state->pdata->force_irq(state->pdev, irq);
175 struct irq_chip *chip = irq_get_chip(irq);
176 if (chip && chip->irq_retrigger)
177 chip->irq_retrigger(irq_get_irq_data(irq));
182 static void fiq_debugger_uart_enable(struct fiq_debugger_state *state)
185 clk_enable(state->clk);
186 if (state->pdata->uart_enable)
187 state->pdata->uart_enable(state->pdev);
190 static void fiq_debugger_uart_disable(struct fiq_debugger_state *state)
192 if (state->pdata->uart_disable)
193 state->pdata->uart_disable(state->pdev);
195 clk_disable(state->clk);
198 static void fiq_debugger_uart_flush(struct fiq_debugger_state *state)
200 if (state->pdata->uart_flush)
201 state->pdata->uart_flush(state->pdev);
204 static void fiq_debugger_putc(struct fiq_debugger_state *state, char c)
206 state->pdata->uart_putc(state->pdev, c);
209 static void fiq_debugger_puts(struct fiq_debugger_state *state, char *s)
214 fiq_debugger_putc(state, '\r');
215 fiq_debugger_putc(state, c);
219 static void fiq_debugger_prompt(struct fiq_debugger_state *state)
221 fiq_debugger_puts(state, "debug> ");
224 static void fiq_debugger_dump_kernel_log(struct fiq_debugger_state *state)
228 struct kmsg_dumper dumper = { .active = true };
231 kmsg_dump_rewind_nolock(&dumper);
232 while (kmsg_dump_get_line_nolock(&dumper, true, buf,
233 sizeof(buf) - 1, &len)) {
235 fiq_debugger_puts(state, buf);
239 static void fiq_debugger_printf(struct fiq_debugger_output *output,
240 const char *fmt, ...)
242 struct fiq_debugger_state *state;
246 state = container_of(output, struct fiq_debugger_state, output);
248 vsnprintf(buf, sizeof(buf), fmt, ap);
251 fiq_debugger_puts(state, buf);
254 /* Safe outside fiq context */
255 static int fiq_debugger_printf_nfiq(void *cookie, const char *fmt, ...)
257 struct fiq_debugger_state *state = cookie;
260 unsigned long irq_flags;
263 vsnprintf(buf, 128, fmt, ap);
266 local_irq_save(irq_flags);
267 fiq_debugger_puts(state, buf);
268 fiq_debugger_uart_flush(state);
269 local_irq_restore(irq_flags);
270 return state->debug_abort;
273 static void fiq_debugger_dump_irqs(struct fiq_debugger_state *state)
276 struct irq_desc *desc;
278 fiq_debugger_printf(&state->output,
279 "irqnr total since-last status name\n");
280 for_each_irq_desc(n, desc) {
281 struct irqaction *act = desc->action;
282 if (!act && !kstat_irqs(n))
284 fiq_debugger_printf(&state->output, "%5d: %10u %11u %8x %s\n", n,
286 kstat_irqs(n) - state->last_irqs[n],
287 desc->status_use_accessors,
288 (act && act->name) ? act->name : "???");
289 state->last_irqs[n] = kstat_irqs(n);
293 static void fiq_debugger_do_ps(struct fiq_debugger_state *state)
295 struct task_struct *g;
296 struct task_struct *p;
298 static const char stat_nam[] = "RSDTtZX";
300 fiq_debugger_printf(&state->output, "pid ppid prio task pc\n");
301 read_lock(&tasklist_lock);
302 do_each_thread(g, p) {
303 task_state = p->state ? __ffs(p->state) + 1 : 0;
304 fiq_debugger_printf(&state->output,
305 "%5d %5d %4d ", p->pid, p->parent->pid, p->prio);
306 fiq_debugger_printf(&state->output, "%-13.13s %c", p->comm,
307 task_state >= sizeof(stat_nam) ? '?' : stat_nam[task_state]);
308 if (task_state == TASK_RUNNING)
309 fiq_debugger_printf(&state->output, " running\n");
311 fiq_debugger_printf(&state->output, " %08lx\n",
313 } while_each_thread(g, p);
314 read_unlock(&tasklist_lock);
317 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
318 static void fiq_debugger_begin_syslog_dump(struct fiq_debugger_state *state)
320 state->syslog_dumping = true;
323 static void fiq_debugger_end_syslog_dump(struct fiq_debugger_state *state)
325 state->syslog_dumping = false;
328 extern int do_syslog(int type, char __user *bug, int count);
329 static void fiq_debugger_begin_syslog_dump(struct fiq_debugger_state *state)
331 do_syslog(5 /* clear */, NULL, 0);
334 static void fiq_debugger_end_syslog_dump(struct fiq_debugger_state *state)
336 fiq_debugger_dump_kernel_log(state);
340 static void fiq_debugger_do_sysrq(struct fiq_debugger_state *state, char rq)
342 if ((rq == 'g' || rq == 'G') && !fiq_kgdb_enable) {
343 fiq_debugger_printf(&state->output, "sysrq-g blocked\n");
346 fiq_debugger_begin_syslog_dump(state);
348 fiq_debugger_end_syslog_dump(state);
352 static void fiq_debugger_do_kgdb(struct fiq_debugger_state *state)
354 if (!fiq_kgdb_enable) {
355 fiq_debugger_printf(&state->output, "kgdb through fiq debugger not enabled\n");
359 fiq_debugger_printf(&state->output, "enabling console and triggering kgdb\n");
360 state->console_enable = true;
365 static void fiq_debugger_schedule_work(struct fiq_debugger_state *state,
370 spin_lock_irqsave(&state->work_lock, flags);
371 if (state->work_cmd[0] != '\0') {
372 fiq_debugger_printf(&state->output, "work command processor busy\n");
373 spin_unlock_irqrestore(&state->work_lock, flags);
377 strlcpy(state->work_cmd, cmd, sizeof(state->work_cmd));
378 spin_unlock_irqrestore(&state->work_lock, flags);
380 schedule_work(&state->work);
383 static void fiq_debugger_work(struct work_struct *work)
385 struct fiq_debugger_state *state;
386 char work_cmd[DEBUG_MAX];
390 state = container_of(work, struct fiq_debugger_state, work);
392 spin_lock_irqsave(&state->work_lock, flags);
394 strlcpy(work_cmd, state->work_cmd, sizeof(work_cmd));
395 state->work_cmd[0] = '\0';
397 spin_unlock_irqrestore(&state->work_lock, flags);
400 if (!strncmp(cmd, "reboot", 6)) {
407 kernel_restart(NULL);
409 fiq_debugger_printf(&state->output, "unknown work command '%s'\n",
414 /* This function CANNOT be called in FIQ context */
415 static void fiq_debugger_irq_exec(struct fiq_debugger_state *state, char *cmd)
417 if (!strcmp(cmd, "ps"))
418 fiq_debugger_do_ps(state);
419 if (!strcmp(cmd, "sysrq"))
420 fiq_debugger_do_sysrq(state, 'h');
421 if (!strncmp(cmd, "sysrq ", 6))
422 fiq_debugger_do_sysrq(state, cmd[6]);
424 if (!strcmp(cmd, "kgdb"))
425 fiq_debugger_do_kgdb(state);
427 if (!strncmp(cmd, "reboot", 6))
428 fiq_debugger_schedule_work(state, cmd);
431 static void fiq_debugger_help(struct fiq_debugger_state *state)
433 fiq_debugger_printf(&state->output,
434 "FIQ Debugger commands:\n"
436 " regs Register dump\n"
437 " allregs Extended Register dump\n"
439 " reboot [<c>] Reboot with command <c>\n"
440 " reset [<c>] Hard reset with command <c>\n"
441 " irqs Interupt status\n"
443 " version Kernel version\n");
444 fiq_debugger_printf(&state->output,
445 " sleep Allow sleep while in FIQ\n"
446 " nosleep Disable sleep while in FIQ\n"
447 " console Switch terminal to console\n"
449 " cpu <number> Switch to CPU<number>\n");
450 fiq_debugger_printf(&state->output,
452 " sysrq sysrq options\n"
453 " sysrq <param> Execute sysrq with <param>\n");
455 fiq_debugger_printf(&state->output,
456 " kgdb Enter kernel debugger\n");
460 static void fiq_debugger_take_affinity(void *info)
462 struct fiq_debugger_state *state = info;
463 struct cpumask cpumask;
465 cpumask_clear(&cpumask);
466 cpumask_set_cpu(get_cpu(), &cpumask);
468 irq_set_affinity(state->uart_irq, &cpumask);
471 static void fiq_debugger_switch_cpu(struct fiq_debugger_state *state, int cpu)
473 if (!fiq_debugger_have_fiq(state))
474 smp_call_function_single(cpu, fiq_debugger_take_affinity, state,
476 state->current_cpu = cpu;
479 static bool fiq_debugger_fiq_exec(struct fiq_debugger_state *state,
480 const char *cmd, const struct pt_regs *regs,
483 bool signal_helper = false;
485 if (!strcmp(cmd, "help") || !strcmp(cmd, "?")) {
486 fiq_debugger_help(state);
487 } else if (!strcmp(cmd, "pc")) {
488 fiq_debugger_dump_pc(&state->output, regs);
489 } else if (!strcmp(cmd, "regs")) {
490 fiq_debugger_dump_regs(&state->output, regs);
491 } else if (!strcmp(cmd, "allregs")) {
492 fiq_debugger_dump_allregs(&state->output, regs);
493 } else if (!strcmp(cmd, "bt")) {
494 fiq_debugger_dump_stacktrace(&state->output, regs, 100, svc_sp);
495 } else if (!strncmp(cmd, "reset", 5)) {
501 strlcpy(tmp_cmd, cmd, sizeof(tmp_cmd));
502 machine_restart(tmp_cmd);
504 machine_restart(NULL);
506 } else if (!strcmp(cmd, "irqs")) {
507 fiq_debugger_dump_irqs(state);
508 } else if (!strcmp(cmd, "kmsg")) {
509 fiq_debugger_dump_kernel_log(state);
510 } else if (!strcmp(cmd, "version")) {
511 fiq_debugger_printf(&state->output, "%s\n", linux_banner);
512 } else if (!strcmp(cmd, "sleep")) {
513 state->no_sleep = false;
514 fiq_debugger_printf(&state->output, "enabling sleep\n");
515 } else if (!strcmp(cmd, "nosleep")) {
516 state->no_sleep = true;
517 fiq_debugger_printf(&state->output, "disabling sleep\n");
518 } else if (!strcmp(cmd, "console")) {
519 fiq_debugger_printf(&state->output, "console mode\n");
520 fiq_debugger_uart_flush(state);
521 state->console_enable = true;
522 } else if (!strcmp(cmd, "cpu")) {
523 fiq_debugger_printf(&state->output, "cpu %d\n", state->current_cpu);
524 } else if (!strncmp(cmd, "cpu ", 4)) {
525 unsigned long cpu = 0;
526 if (kstrtoul(cmd + 4, 10, &cpu) == 0)
527 fiq_debugger_switch_cpu(state, cpu);
529 fiq_debugger_printf(&state->output, "invalid cpu\n");
530 fiq_debugger_printf(&state->output, "cpu %d\n", state->current_cpu);
532 if (state->debug_busy) {
533 fiq_debugger_printf(&state->output,
534 "command processor busy. trying to abort.\n");
535 state->debug_abort = -1;
537 strcpy(state->debug_cmd, cmd);
538 state->debug_busy = 1;
543 if (!state->console_enable)
544 fiq_debugger_prompt(state);
546 return signal_helper;
549 static void fiq_debugger_sleep_timer_expired(unsigned long data)
551 struct fiq_debugger_state *state = (struct fiq_debugger_state *)data;
554 spin_lock_irqsave(&state->sleep_timer_lock, flags);
555 if (state->uart_enabled && !state->no_sleep) {
556 if (state->debug_enable && !state->console_enable) {
557 state->debug_enable = false;
558 fiq_debugger_printf_nfiq(state,
559 "suspending fiq debugger\n");
561 state->ignore_next_wakeup_irq = true;
562 fiq_debugger_uart_disable(state);
563 state->uart_enabled = false;
564 fiq_debugger_enable_wakeup_irq(state);
566 wake_unlock(&state->debugger_wake_lock);
567 spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
570 static void fiq_debugger_handle_wakeup(struct fiq_debugger_state *state)
574 spin_lock_irqsave(&state->sleep_timer_lock, flags);
575 if (state->wakeup_irq >= 0 && state->ignore_next_wakeup_irq) {
576 state->ignore_next_wakeup_irq = false;
577 } else if (!state->uart_enabled) {
578 wake_lock(&state->debugger_wake_lock);
579 fiq_debugger_uart_enable(state);
580 state->uart_enabled = true;
581 fiq_debugger_disable_wakeup_irq(state);
582 mod_timer(&state->sleep_timer, jiffies + HZ / 2);
584 spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
587 static irqreturn_t fiq_debugger_wakeup_irq_handler(int irq, void *dev)
589 struct fiq_debugger_state *state = dev;
591 if (!state->no_sleep)
592 fiq_debugger_puts(state, "WAKEUP\n");
593 fiq_debugger_handle_wakeup(state);
599 void fiq_debugger_handle_console_irq_context(struct fiq_debugger_state *state)
601 #if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
602 if (state->tty_port.ops) {
604 int count = fiq_debugger_ringbuf_level(state->tty_rbuf);
605 for (i = 0; i < count; i++) {
606 int c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0);
607 tty_insert_flip_char(&state->tty_port, c, TTY_NORMAL);
608 if (!fiq_debugger_ringbuf_consume(state->tty_rbuf, 1))
609 pr_warn("fiq tty failed to consume byte\n");
611 tty_flip_buffer_push(&state->tty_port);
616 static void fiq_debugger_handle_irq_context(struct fiq_debugger_state *state)
618 if (!state->no_sleep) {
621 spin_lock_irqsave(&state->sleep_timer_lock, flags);
622 wake_lock(&state->debugger_wake_lock);
623 mod_timer(&state->sleep_timer, jiffies + HZ * 5);
624 spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
626 fiq_debugger_handle_console_irq_context(state);
627 if (state->debug_busy) {
628 fiq_debugger_irq_exec(state, state->debug_cmd);
629 if (!state->console_enable)
630 fiq_debugger_prompt(state);
631 state->debug_busy = 0;
635 static int fiq_debugger_getc(struct fiq_debugger_state *state)
637 return state->pdata->uart_getc(state->pdev);
640 static bool fiq_debugger_handle_uart_interrupt(struct fiq_debugger_state *state,
641 int this_cpu, const struct pt_regs *regs, void *svc_sp)
646 bool signal_helper = false;
648 if (this_cpu != state->current_cpu) {
652 if (atomic_inc_return(&state->unhandled_fiq_count) !=
653 MAX_UNHANDLED_FIQ_COUNT)
656 fiq_debugger_printf(&state->output,
657 "fiq_debugger: cpu %d not responding, "
658 "reverting to cpu %d\n", state->current_cpu,
661 atomic_set(&state->unhandled_fiq_count, 0);
662 fiq_debugger_switch_cpu(state, this_cpu);
666 state->in_fiq = true;
668 while ((c = fiq_debugger_getc(state)) != FIQ_DEBUGGER_NO_CHAR) {
670 if (!state->debug_enable) {
671 if ((c == 13) || (c == 10)) {
672 state->debug_enable = true;
673 state->debug_count = 0;
674 fiq_debugger_prompt(state);
676 } else if (c == FIQ_DEBUGGER_BREAK) {
677 state->console_enable = false;
678 fiq_debugger_puts(state, "fiq debugger mode\n");
679 state->debug_count = 0;
680 fiq_debugger_prompt(state);
681 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
682 } else if (state->console_enable && state->tty_rbuf) {
683 fiq_debugger_ringbuf_push(state->tty_rbuf, c);
684 signal_helper = true;
686 } else if ((c >= ' ') && (c < 127)) {
687 if (state->debug_count < (DEBUG_MAX - 1)) {
688 state->debug_buf[state->debug_count++] = c;
689 fiq_debugger_putc(state, c);
691 } else if ((c == 8) || (c == 127)) {
692 if (state->debug_count > 0) {
693 state->debug_count--;
694 fiq_debugger_putc(state, 8);
695 fiq_debugger_putc(state, ' ');
696 fiq_debugger_putc(state, 8);
698 } else if ((c == 13) || (c == 10)) {
699 if (c == '\r' || (c == '\n' && last_c != '\r')) {
700 fiq_debugger_putc(state, '\r');
701 fiq_debugger_putc(state, '\n');
703 if (state->debug_count) {
704 state->debug_buf[state->debug_count] = 0;
705 state->debug_count = 0;
707 fiq_debugger_fiq_exec(state,
711 fiq_debugger_prompt(state);
716 if (!state->console_enable)
717 fiq_debugger_uart_flush(state);
718 if (state->pdata->fiq_ack)
719 state->pdata->fiq_ack(state->pdev, state->fiq);
721 /* poke sleep timer if necessary */
722 if (state->debug_enable && !state->no_sleep)
723 signal_helper = true;
725 atomic_set(&state->unhandled_fiq_count, 0);
726 state->in_fiq = false;
728 return signal_helper;
731 #ifdef CONFIG_FIQ_GLUE
732 static void fiq_debugger_fiq(struct fiq_glue_handler *h,
733 const struct pt_regs *regs, void *svc_sp)
735 struct fiq_debugger_state *state =
736 container_of(h, struct fiq_debugger_state, handler);
737 unsigned int this_cpu = THREAD_INFO(svc_sp)->cpu;
740 need_irq = fiq_debugger_handle_uart_interrupt(state, this_cpu, regs,
743 fiq_debugger_force_irq(state);
748 * When not using FIQs, we only use this single interrupt as an entry point.
749 * This just effectively takes over the UART interrupt and does all the work
752 static irqreturn_t fiq_debugger_uart_irq(int irq, void *dev)
754 struct fiq_debugger_state *state = dev;
757 fiq_debugger_handle_wakeup(state);
759 /* handle the debugger irq in regular context */
760 not_done = fiq_debugger_handle_uart_interrupt(state, smp_processor_id(),
762 current_thread_info());
764 fiq_debugger_handle_irq_context(state);
770 * If FIQs are used, not everything can happen in fiq context.
771 * FIQ handler does what it can and then signals this interrupt to finish the
772 * job in irq context.
774 static irqreturn_t fiq_debugger_signal_irq(int irq, void *dev)
776 struct fiq_debugger_state *state = dev;
778 if (state->pdata->force_irq_ack)
779 state->pdata->force_irq_ack(state->pdev, state->signal_irq);
781 fiq_debugger_handle_irq_context(state);
786 #ifdef CONFIG_FIQ_GLUE
787 static void fiq_debugger_resume(struct fiq_glue_handler *h)
789 struct fiq_debugger_state *state =
790 container_of(h, struct fiq_debugger_state, handler);
791 if (state->pdata->uart_resume)
792 state->pdata->uart_resume(state->pdev);
796 #if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
797 struct tty_driver *fiq_debugger_console_device(struct console *co, int *index)
800 return fiq_tty_driver;
803 static void fiq_debugger_console_write(struct console *co,
804 const char *s, unsigned int count)
806 struct fiq_debugger_state *state;
809 state = container_of(co, struct fiq_debugger_state, console);
811 if (!state->console_enable && !state->syslog_dumping)
814 fiq_debugger_uart_enable(state);
815 spin_lock_irqsave(&state->console_lock, flags);
818 fiq_debugger_putc(state, '\r');
819 fiq_debugger_putc(state, *s++);
821 fiq_debugger_uart_flush(state);
822 spin_unlock_irqrestore(&state->console_lock, flags);
823 fiq_debugger_uart_disable(state);
826 static struct console fiq_debugger_console = {
828 .device = fiq_debugger_console_device,
829 .write = fiq_debugger_console_write,
830 .flags = CON_PRINTBUFFER | CON_ANYTIME | CON_ENABLED,
833 int fiq_tty_open(struct tty_struct *tty, struct file *filp)
835 int line = tty->index;
836 struct fiq_debugger_state **states = tty->driver->driver_state;
837 struct fiq_debugger_state *state = states[line];
839 return tty_port_open(&state->tty_port, tty, filp);
842 void fiq_tty_close(struct tty_struct *tty, struct file *filp)
844 tty_port_close(tty->port, tty, filp);
847 int fiq_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
850 int line = tty->index;
851 struct fiq_debugger_state **states = tty->driver->driver_state;
852 struct fiq_debugger_state *state = states[line];
854 if (!state->console_enable)
857 fiq_debugger_uart_enable(state);
858 spin_lock_irq(&state->console_lock);
859 for (i = 0; i < count; i++)
860 fiq_debugger_putc(state, *buf++);
861 spin_unlock_irq(&state->console_lock);
862 fiq_debugger_uart_disable(state);
867 int fiq_tty_write_room(struct tty_struct *tty)
872 #ifdef CONFIG_CONSOLE_POLL
873 static int fiq_tty_poll_init(struct tty_driver *driver, int line, char *options)
878 static int fiq_tty_poll_get_char(struct tty_driver *driver, int line)
880 struct fiq_debugger_state **states = driver->driver_state;
881 struct fiq_debugger_state *state = states[line];
882 int c = NO_POLL_CHAR;
884 fiq_debugger_uart_enable(state);
885 if (fiq_debugger_have_fiq(state)) {
886 int count = fiq_debugger_ringbuf_level(state->tty_rbuf);
888 c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0);
889 fiq_debugger_ringbuf_consume(state->tty_rbuf, 1);
892 c = fiq_debugger_getc(state);
893 if (c == FIQ_DEBUGGER_NO_CHAR)
896 fiq_debugger_uart_disable(state);
901 static void fiq_tty_poll_put_char(struct tty_driver *driver, int line, char ch)
903 struct fiq_debugger_state **states = driver->driver_state;
904 struct fiq_debugger_state *state = states[line];
905 fiq_debugger_uart_enable(state);
906 fiq_debugger_putc(state, ch);
907 fiq_debugger_uart_disable(state);
911 static const struct tty_port_operations fiq_tty_port_ops;
913 static const struct tty_operations fiq_tty_driver_ops = {
914 .write = fiq_tty_write,
915 .write_room = fiq_tty_write_room,
916 .open = fiq_tty_open,
917 .close = fiq_tty_close,
918 #ifdef CONFIG_CONSOLE_POLL
919 .poll_init = fiq_tty_poll_init,
920 .poll_get_char = fiq_tty_poll_get_char,
921 .poll_put_char = fiq_tty_poll_put_char,
925 static int fiq_debugger_tty_init(void)
928 struct fiq_debugger_state **states = NULL;
930 states = kzalloc(sizeof(*states) * MAX_FIQ_DEBUGGER_PORTS, GFP_KERNEL);
932 pr_err("Failed to allocate fiq debugger state structres\n");
936 fiq_tty_driver = alloc_tty_driver(MAX_FIQ_DEBUGGER_PORTS);
937 if (!fiq_tty_driver) {
938 pr_err("Failed to allocate fiq debugger tty\n");
943 fiq_tty_driver->owner = THIS_MODULE;
944 fiq_tty_driver->driver_name = "fiq-debugger";
945 fiq_tty_driver->name = "ttyFIQ";
946 fiq_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
947 fiq_tty_driver->subtype = SERIAL_TYPE_NORMAL;
948 fiq_tty_driver->init_termios = tty_std_termios;
949 fiq_tty_driver->flags = TTY_DRIVER_REAL_RAW |
950 TTY_DRIVER_DYNAMIC_DEV;
951 fiq_tty_driver->driver_state = states;
953 fiq_tty_driver->init_termios.c_cflag =
954 B115200 | CS8 | CREAD | HUPCL | CLOCAL;
955 fiq_tty_driver->init_termios.c_ispeed = 115200;
956 fiq_tty_driver->init_termios.c_ospeed = 115200;
958 tty_set_operations(fiq_tty_driver, &fiq_tty_driver_ops);
960 ret = tty_register_driver(fiq_tty_driver);
962 pr_err("Failed to register fiq tty: %d\n", ret);
966 pr_info("Registered FIQ tty driver\n");
970 put_tty_driver(fiq_tty_driver);
971 fiq_tty_driver = NULL;
977 static int fiq_debugger_tty_init_one(struct fiq_debugger_state *state)
980 struct device *tty_dev;
981 struct fiq_debugger_state **states = fiq_tty_driver->driver_state;
983 states[state->pdev->id] = state;
985 state->tty_rbuf = fiq_debugger_ringbuf_alloc(1024);
986 if (!state->tty_rbuf) {
987 pr_err("Failed to allocate fiq debugger ringbuf\n");
992 tty_port_init(&state->tty_port);
993 state->tty_port.ops = &fiq_tty_port_ops;
995 tty_dev = tty_port_register_device(&state->tty_port, fiq_tty_driver,
996 state->pdev->id, &state->pdev->dev);
997 if (IS_ERR(tty_dev)) {
998 pr_err("Failed to register fiq debugger tty device\n");
999 ret = PTR_ERR(tty_dev);
1003 device_set_wakeup_capable(tty_dev, 1);
1005 pr_info("Registered fiq debugger ttyFIQ%d\n", state->pdev->id);
1010 fiq_debugger_ringbuf_free(state->tty_rbuf);
1011 state->tty_rbuf = NULL;
1016 static int fiq_debugger_dev_suspend(struct device *dev)
1018 struct platform_device *pdev = to_platform_device(dev);
1019 struct fiq_debugger_state *state = platform_get_drvdata(pdev);
1021 if (state->pdata->uart_dev_suspend)
1022 return state->pdata->uart_dev_suspend(pdev);
1026 static int fiq_debugger_dev_resume(struct device *dev)
1028 struct platform_device *pdev = to_platform_device(dev);
1029 struct fiq_debugger_state *state = platform_get_drvdata(pdev);
1031 if (state->pdata->uart_dev_resume)
1032 return state->pdata->uart_dev_resume(pdev);
1036 static int fiq_debugger_probe(struct platform_device *pdev)
1039 struct fiq_debugger_pdata *pdata = dev_get_platdata(&pdev->dev);
1040 struct fiq_debugger_state *state;
1044 if (pdev->id >= MAX_FIQ_DEBUGGER_PORTS)
1047 if (!pdata->uart_getc || !pdata->uart_putc)
1049 if ((pdata->uart_enable && !pdata->uart_disable) ||
1050 (!pdata->uart_enable && pdata->uart_disable))
1053 fiq = platform_get_irq_byname(pdev, "fiq");
1054 uart_irq = platform_get_irq_byname(pdev, "uart_irq");
1056 /* uart_irq mode and fiq mode are mutually exclusive, but one of them
1058 if ((uart_irq < 0 && fiq < 0) || (uart_irq >= 0 && fiq >= 0))
1060 if (fiq >= 0 && !pdata->fiq_enable)
1063 state = kzalloc(sizeof(*state), GFP_KERNEL);
1064 state->output.printf = fiq_debugger_printf;
1065 setup_timer(&state->sleep_timer, fiq_debugger_sleep_timer_expired,
1066 (unsigned long)state);
1067 state->pdata = pdata;
1069 state->no_sleep = initial_no_sleep;
1070 state->debug_enable = initial_debug_enable;
1071 state->console_enable = initial_console_enable;
1074 state->uart_irq = uart_irq;
1075 state->signal_irq = platform_get_irq_byname(pdev, "signal");
1076 state->wakeup_irq = platform_get_irq_byname(pdev, "wakeup");
1078 INIT_WORK(&state->work, fiq_debugger_work);
1079 spin_lock_init(&state->work_lock);
1081 platform_set_drvdata(pdev, state);
1083 spin_lock_init(&state->sleep_timer_lock);
1085 if (state->wakeup_irq < 0 && fiq_debugger_have_fiq(state))
1086 state->no_sleep = true;
1087 state->ignore_next_wakeup_irq = !state->no_sleep;
1089 wake_lock_init(&state->debugger_wake_lock,
1090 WAKE_LOCK_SUSPEND, "serial-debug");
1092 state->clk = clk_get(&pdev->dev, NULL);
1093 if (IS_ERR(state->clk))
1096 /* do not call pdata->uart_enable here since uart_init may still
1097 * need to do some initialization before uart_enable can work.
1098 * So, only try to manage the clock during init.
1101 clk_enable(state->clk);
1103 if (pdata->uart_init) {
1104 ret = pdata->uart_init(pdev);
1109 fiq_debugger_printf_nfiq(state,
1110 "<hit enter %sto activate fiq debugger>\n",
1111 state->no_sleep ? "" : "twice ");
1113 #ifdef CONFIG_FIQ_GLUE
1114 if (fiq_debugger_have_fiq(state)) {
1115 state->handler.fiq = fiq_debugger_fiq;
1116 state->handler.resume = fiq_debugger_resume;
1117 ret = fiq_glue_register_handler(&state->handler);
1119 pr_err("%s: could not install fiq handler\n", __func__);
1120 goto err_register_irq;
1123 pdata->fiq_enable(pdev, state->fiq, 1);
1127 ret = request_irq(state->uart_irq, fiq_debugger_uart_irq,
1128 IRQF_NO_SUSPEND, "debug", state);
1130 pr_err("%s: could not install irq handler\n", __func__);
1131 goto err_register_irq;
1134 /* for irq-only mode, we want this irq to wake us up, if it
1137 enable_irq_wake(state->uart_irq);
1141 clk_disable(state->clk);
1143 if (state->signal_irq >= 0) {
1144 ret = request_irq(state->signal_irq, fiq_debugger_signal_irq,
1145 IRQF_TRIGGER_RISING, "debug-signal", state);
1147 pr_err("serial_debugger: could not install signal_irq");
1150 if (state->wakeup_irq >= 0) {
1151 ret = request_irq(state->wakeup_irq,
1152 fiq_debugger_wakeup_irq_handler,
1153 IRQF_TRIGGER_FALLING,
1154 "debug-wakeup", state);
1156 pr_err("serial_debugger: "
1157 "could not install wakeup irq\n");
1158 state->wakeup_irq = -1;
1160 ret = enable_irq_wake(state->wakeup_irq);
1162 pr_err("serial_debugger: "
1163 "could not enable wakeup\n");
1164 state->wakeup_irq_no_set_wake = true;
1168 if (state->no_sleep)
1169 fiq_debugger_handle_wakeup(state);
1171 #if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
1172 spin_lock_init(&state->console_lock);
1173 state->console = fiq_debugger_console;
1174 state->console.index = pdev->id;
1175 if (!console_set_on_cmdline)
1176 add_preferred_console(state->console.name,
1177 state->console.index, NULL);
1178 register_console(&state->console);
1179 fiq_debugger_tty_init_one(state);
1184 if (pdata->uart_free)
1185 pdata->uart_free(pdev);
1188 clk_disable(state->clk);
1190 clk_put(state->clk);
1191 wake_lock_destroy(&state->debugger_wake_lock);
1192 platform_set_drvdata(pdev, NULL);
1197 static const struct dev_pm_ops fiq_debugger_dev_pm_ops = {
1198 .suspend = fiq_debugger_dev_suspend,
1199 .resume = fiq_debugger_dev_resume,
1202 static struct platform_driver fiq_debugger_driver = {
1203 .probe = fiq_debugger_probe,
1205 .name = "fiq_debugger",
1206 .pm = &fiq_debugger_dev_pm_ops,
1210 #if defined(CONFIG_FIQ_DEBUGGER_UART_OVERLAY)
1211 int fiq_debugger_uart_overlay(void)
1213 struct device_node *onp = of_find_node_by_path("/uart_overlay@0");
1217 pr_err("serial_debugger: uart overlay not found\n");
1221 ret = of_overlay_create(onp);
1223 pr_err("serial_debugger: fail to create overlay: %d\n", ret);
1228 pr_info("serial_debugger: uart overlay applied\n");
1233 static int __init fiq_debugger_init(void)
1235 if (fiq_debugger_disable) {
1236 pr_err("serial_debugger: disabled\n");
1239 #if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
1240 fiq_debugger_tty_init();
1242 #if defined(CONFIG_FIQ_DEBUGGER_UART_OVERLAY)
1243 fiq_debugger_uart_overlay();
1245 return platform_driver_register(&fiq_debugger_driver);
1248 postcore_initcall(fiq_debugger_init);