drivers/staging/android/fiq_debugger/fiq_debugger.c

   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 #ifdef CONFIG_FIQ_GLUE
  39 #include <asm/fiq_glue.h>
  40 #endif
  41
  42 #include <linux/uaccess.h>
  43 #include <linux/rockchip/grf.h>
  44 #include <linux/rockchip/iomap.h>
  45 #include <linux/rockchip/cpu.h>
  46
  47 #include "fiq_debugger.h"
  48 #include "fiq_debugger_priv.h"
  49 #include "fiq_debugger_ringbuf.h"
  50
  51 #ifdef CONFIG_RK29_WATCHDOG
  52 extern void rk29_wdt_keepalive(void);
  53 #define wdt_keepalive() rk29_wdt_keepalive()
  54 #else
  55 #define wdt_keepalive() do {} while (0)
  56 #endif
  57 #define DEBUG_MAX 64
  58 #define CMD_COUNT 0x0f
  59 #define MAX_UNHANDLED_FIQ_COUNT 1000000
  60
  61 #ifdef CONFIG_ARCH_ROCKCHIP
  62 #define MAX_FIQ_DEBUGGER_PORTS 1
  63 #else
  64 #define MAX_FIQ_DEBUGGER_PORTS 4
  65 #endif
  66
  67 struct fiq_debugger_state {
  68 #ifdef CONFIG_FIQ_GLUE
  69         struct fiq_glue_handler handler;
  70 #endif
  71         struct fiq_debugger_output output;
  72
  73         int fiq;
  74         int uart_irq;
  75         int signal_irq;
  76         int wakeup_irq;
  77         bool wakeup_irq_no_set_wake;
  78         struct clk *clk;
  79         struct fiq_debugger_pdata *pdata;
  80         struct platform_device *pdev;
  81
  82         char debug_cmd[DEBUG_MAX];
  83         int debug_busy;
  84         int debug_abort;
  85
  86         char debug_buf[DEBUG_MAX];
  87         int debug_count;
  88
  89 #ifdef CONFIG_ARCH_ROCKCHIP
  90         char cmd_buf[CMD_COUNT+1][DEBUG_MAX];
  91         int back_pointer;
  92         int current_pointer;
  93 #endif
  94         bool no_sleep;
  95         bool debug_enable;
  96         bool ignore_next_wakeup_irq;
  97         struct timer_list sleep_timer;
  98         spinlock_t sleep_timer_lock;
  99         bool uart_enabled;
 100         struct wake_lock debugger_wake_lock;
 101         bool console_enable;
 102         int current_cpu;
 103         atomic_t unhandled_fiq_count;
 104         bool in_fiq;
 105
 106         struct work_struct work;
 107         spinlock_t work_lock;
 108         char work_cmd[DEBUG_MAX];
 109
 110 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
 111         spinlock_t console_lock;
 112         struct console console;
 113         struct tty_port tty_port;
 114         struct fiq_debugger_ringbuf *tty_rbuf;
 115         bool syslog_dumping;
 116 #endif
 117
 118 #ifdef CONFIG_ARCH_ROCKCHIP
 119         unsigned int last_irqs[1024];
 120         unsigned int last_local_irqs[NR_CPUS][32];
 121 #else
 122         unsigned int last_irqs[NR_IRQS];
 123         unsigned int last_local_timer_irqs[NR_CPUS];
 124 #endif
 125 };
 126
 127 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
 128 struct tty_driver *fiq_tty_driver;
 129 #endif
 130
 131 #ifdef CONFIG_FIQ_DEBUGGER_NO_SLEEP
 132 static bool initial_no_sleep = true;
 133 #else
 134 static bool initial_no_sleep;
 135 #endif
 136
 137 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE
 138 static bool initial_debug_enable = true;
 139 static bool initial_console_enable = true;
 140 #else
 141 static bool initial_debug_enable;
 142 static bool initial_console_enable;
 143 #endif
 144
 145 #ifdef CONFIG_FIQ_DEBUGGER_EL3_TO_EL1
 146 static struct fiq_debugger_state *state_tf;
 147 #endif
 148
 149 static bool fiq_kgdb_enable;
 150
 151 static unsigned long jif = 0, recv_count0 = 0, recv_count1 = 0;
 152
 153 module_param_named(no_sleep, initial_no_sleep, bool, 0644);
 154 module_param_named(debug_enable, initial_debug_enable, bool, 0644);
 155 module_param_named(console_enable, initial_console_enable, bool, 0644);
 156 module_param_named(kgdb_enable, fiq_kgdb_enable, bool, 0644);
 157
 158 void gic_set_irq_secure(struct irq_data *d);
 159 void gic_set_irq_priority(struct irq_data *d, u8 pri);
 160
 161 #ifdef CONFIG_FIQ_DEBUGGER_WAKEUP_IRQ_ALWAYS_ON
 162 static inline
 163 void fiq_debugger_enable_wakeup_irq(struct fiq_debugger_state *state) {}
 164 static inline
 165 void fiq_debugger_disable_wakeup_irq(struct fiq_debugger_state *state) {}
 166 #else
 167 static inline
 168 void fiq_debugger_enable_wakeup_irq(struct fiq_debugger_state *state)
 169 {
 170         if (state->wakeup_irq < 0)
 171                 return;
 172         enable_irq(state->wakeup_irq);
 173         if (!state->wakeup_irq_no_set_wake)
 174                 enable_irq_wake(state->wakeup_irq);
 175 }
 176 static inline
 177 void fiq_debugger_disable_wakeup_irq(struct fiq_debugger_state *state)
 178 {
 179         if (state->wakeup_irq < 0)
 180                 return;
 181         disable_irq_nosync(state->wakeup_irq);
 182         if (!state->wakeup_irq_no_set_wake)
 183                 disable_irq_wake(state->wakeup_irq);
 184 }
 185 #endif
 186
 187 static inline bool fiq_debugger_have_fiq(struct fiq_debugger_state *state)
 188 {
 189         return (state->fiq >= 0);
 190 }
 191
 192 #if defined(CONFIG_FIQ_GLUE) || defined(CONFIG_FIQ_DEBUGGER_EL3_TO_EL1)
 193 static void fiq_debugger_force_irq(struct fiq_debugger_state *state)
 194 {
 195         unsigned int irq = state->signal_irq;
 196
 197         if (WARN_ON(!fiq_debugger_have_fiq(state)))
 198                 return;
 199         if (irq < 0)
 200                 return;
 201         if (state->pdata->force_irq) {
 202                 state->pdata->force_irq(state->pdev, irq);
 203         } else {
 204                 struct irq_chip *chip = irq_get_chip(irq);
 205                 if (chip && chip->irq_retrigger)
 206                         chip->irq_retrigger(irq_get_irq_data(irq));
 207         }
 208 }
 209 #endif
 210
 211 static void fiq_debugger_uart_enable(struct fiq_debugger_state *state)
 212 {
 213         if (state->clk)
 214                 clk_enable(state->clk);
 215         if (state->pdata->uart_enable)
 216                 state->pdata->uart_enable(state->pdev);
 217 }
 218
 219 static void fiq_debugger_uart_disable(struct fiq_debugger_state *state)
 220 {
 221         if (state->pdata->uart_disable)
 222                 state->pdata->uart_disable(state->pdev);
 223         if (state->clk)
 224                 clk_disable(state->clk);
 225 }
 226
 227 static void fiq_debugger_uart_flush(struct fiq_debugger_state *state)
 228 {
 229         if (state->pdata->uart_flush)
 230                 state->pdata->uart_flush(state->pdev);
 231 }
 232
 233 static void fiq_debugger_putc(struct fiq_debugger_state *state, char c)
 234 {
 235         state->pdata->uart_putc(state->pdev, c);
 236 }
 237
 238 static void fiq_debugger_puts(struct fiq_debugger_state *state, char *s)
 239 {
 240         unsigned c;
 241         while ((c = *s++)) {
 242                 if (c == '\n')
 243                         fiq_debugger_putc(state, '\r');
 244                 fiq_debugger_putc(state, c);
 245         }
 246 }
 247
 248 static void fiq_debugger_prompt(struct fiq_debugger_state *state)
 249 {
 250         fiq_debugger_puts(state, "debug> ");
 251 }
 252
 253 static void fiq_debugger_dump_kernel_log(struct fiq_debugger_state *state)
 254 {
 255 #ifdef CONFIG_ARCH_ROCKCHIP
 256         char buf[968];
 257 #else
 258         char buf[512];
 259 #endif
 260         size_t len;
 261         struct kmsg_dumper dumper = { .active = true };
 262
 263
 264         kmsg_dump_rewind_nolock(&dumper);
 265         while (kmsg_dump_get_line_nolock(&dumper, true, buf,
 266                                          sizeof(buf) - 1, &len)) {
 267                 buf[len] = 0;
 268                 fiq_debugger_puts(state, buf);
 269 #ifdef CONFIG_ARCH_ROCKCHIP
 270                 wdt_keepalive();
 271 #endif
 272         }
 273 }
 274
 275 #ifdef CONFIG_RK_LAST_LOG
 276 #include <linux/ctype.h>
 277 extern char *rk_last_log_get(unsigned *size);
 278 static void fiq_debugger_dump_last_kernel_log(struct fiq_debugger_state *state)
 279 {
 280         unsigned size, i, c;
 281         char *s = rk_last_log_get(&size);
 282
 283         for (i = 0; i < size; i++) {
 284                 if (i % 1024 == 0)
 285                         wdt_keepalive();
 286                 c = s[i];
 287                 if (c == '\n') {
 288                         state->pdata->uart_putc(state->pdev, '\r');
 289                         state->pdata->uart_putc(state->pdev, c);
 290                 } else if (isascii(c) && isprint(c)) {
 291                         state->pdata->uart_putc(state->pdev, c);
 292                 }
 293         }
 294 }
 295 #endif
 296
 297 static void fiq_debugger_printf(struct fiq_debugger_output *output,
 298                                const char *fmt, ...)
 299 {
 300         struct fiq_debugger_state *state;
 301         char buf[256];
 302         va_list ap;
 303
 304         state = container_of(output, struct fiq_debugger_state, output);
 305         va_start(ap, fmt);
 306         vsnprintf(buf, sizeof(buf), fmt, ap);
 307         va_end(ap);
 308
 309         fiq_debugger_puts(state, buf);
 310 }
 311
 312 /* Safe outside fiq context */
 313 static int fiq_debugger_printf_nfiq(void *cookie, const char *fmt, ...)
 314 {
 315         struct fiq_debugger_state *state = cookie;
 316         char buf[256];
 317         va_list ap;
 318         unsigned long irq_flags;
 319
 320         va_start(ap, fmt);
 321         vsnprintf(buf, 128, fmt, ap);
 322         va_end(ap);
 323
 324         local_irq_save(irq_flags);
 325         fiq_debugger_puts(state, buf);
 326         fiq_debugger_uart_flush(state);
 327         local_irq_restore(irq_flags);
 328         return state->debug_abort;
 329 }
 330
 331 static void fiq_debugger_dump_irqs(struct fiq_debugger_state *state)
 332 {
 333         int n;
 334         unsigned int cpu;
 335         struct irq_desc *desc;
 336
 337         fiq_debugger_printf(&state->output,
 338                         "irqnr       total  since-last   status  name\n");
 339         for_each_irq_desc(n, desc) {
 340                 struct irqaction *act = desc->action;
 341                 if (!act && !kstat_irqs(n))
 342                         continue;
 343                 fiq_debugger_printf(&state->output, "%5d: %10u %11u %8x  %s\n", n,
 344                         kstat_irqs(n),
 345                         kstat_irqs(n) - state->last_irqs[n],
 346                         desc->status_use_accessors,
 347                         (act && act->name) ? act->name : "???");
 348                 state->last_irqs[n] = kstat_irqs(n);
 349         }
 350
 351 #ifdef CONFIG_ARCH_ROCKCHIP
 352         for (n = 16; n < 32; n++) {
 353                 desc = irq_to_desc(n);
 354                 if (!desc)
 355                         continue;
 356                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
 357                         unsigned int irqs = kstat_irqs_cpu(n, cpu);
 358                         struct irqaction *act = desc->action;
 359                         const char *name = (act && act->name) ? act->name : "???";
 360                         if (!irqs)
 361                                 continue;
 362                         fiq_debugger_printf(&state->output,
 363                                 "%5d: %10u %11u           %s (CPU%d)\n", n,
 364                                 irqs, irqs - state->last_local_irqs[cpu][n],
 365                                 name, cpu);
 366                         state->last_local_irqs[cpu][n] = irqs;
 367                 }
 368         }
 369         for (n = 0; n < NR_IPI; n++) {
 370 #define S(x,s)  [x] = s
 371 #ifdef CONFIG_ARM
 372                 enum ipi_msg_type {
 373                         IPI_WAKEUP,
 374                         IPI_TIMER,
 375                         IPI_RESCHEDULE,
 376                         IPI_CALL_FUNC,
 377                         IPI_CALL_FUNC_SINGLE,
 378                         IPI_CPU_STOP,
 379                         IPI_COMPLETION,
 380                         IPI_CPU_BACKTRACE,
 381                 };
 382                 static const char *ipi_types[NR_IPI] = {
 383                         S(IPI_WAKEUP, "CPU wakeup"),
 384                         S(IPI_TIMER, "Timer broadcast"),
 385                         S(IPI_RESCHEDULE, "Rescheduling"),
 386                         S(IPI_CALL_FUNC, "Function call"),
 387                         S(IPI_CALL_FUNC_SINGLE, "Single function call"),
 388                         S(IPI_CPU_STOP, "CPU stop"),
 389                         S(IPI_COMPLETION, "Completion"),
 390                         S(IPI_CPU_BACKTRACE, "CPU backtrace"),
 391                 };
 392 #elif defined(CONFIG_ARM64)
 393                 enum ipi_msg_type {
 394                         IPI_RESCHEDULE,
 395                         IPI_CALL_FUNC,
 396                         IPI_CALL_FUNC_SINGLE,
 397                         IPI_CPU_STOP,
 398                         IPI_TIMER,
 399                 };
 400                 static const char *ipi_types[NR_IPI] = {
 401                         S(IPI_RESCHEDULE, "Rescheduling"),
 402                         S(IPI_CALL_FUNC, "Function call"),
 403                         S(IPI_CALL_FUNC_SINGLE, "Single function call"),
 404                         S(IPI_CPU_STOP, "CPU stop"),
 405                         S(IPI_TIMER, "Timer broadcast"),
 406                 };
 407 #endif
 408 #undef S
 409                 for (cpu = 0; cpu < NR_CPUS; cpu++) {
 410                         unsigned int irqs = __get_irq_stat(cpu, ipi_irqs[n]);
 411                         if (irqs == 0)
 412                                 continue;
 413                         fiq_debugger_printf(&state->output,
 414                                 "%5d: %10u %11u           %s (CPU%d)\n",
 415                                 n, irqs, irqs - state->last_local_irqs[cpu][n],
 416                                 ipi_types[n], cpu);
 417                         state->last_local_irqs[cpu][n] = irqs;
 418                 }
 419         }
 420 #endif
 421 }
 422
 423 static void fiq_debugger_do_ps(struct fiq_debugger_state *state)
 424 {
 425         struct task_struct *g;
 426         struct task_struct *p;
 427         unsigned task_state;
 428         static const char stat_nam[] = "RSDTtZX";
 429
 430         fiq_debugger_printf(&state->output, "pid   ppid  prio task            pc\n");
 431         read_lock(&tasklist_lock);
 432         do_each_thread(g, p) {
 433                 task_state = p->state ? __ffs(p->state) + 1 : 0;
 434                 fiq_debugger_printf(&state->output,
 435                              "%5d %5d %4d ", p->pid, p->parent->pid, p->prio);
 436                 fiq_debugger_printf(&state->output, "%-13.13s %c", p->comm,
 437                              task_state >= sizeof(stat_nam) ? '?' : stat_nam[task_state]);
 438                 if (task_state == TASK_RUNNING)
 439                         fiq_debugger_printf(&state->output, " running\n");
 440                 else
 441                         fiq_debugger_printf(&state->output, " %08lx\n",
 442                                         thread_saved_pc(p));
 443         } while_each_thread(g, p);
 444         read_unlock(&tasklist_lock);
 445 }
 446
 447 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
 448 static void fiq_debugger_begin_syslog_dump(struct fiq_debugger_state *state)
 449 {
 450         state->syslog_dumping = true;
 451 }
 452
 453 static void fiq_debugger_end_syslog_dump(struct fiq_debugger_state *state)
 454 {
 455         state->syslog_dumping = false;
 456 }
 457 #else
 458 extern int do_syslog(int type, char __user *bug, int count);
 459 static void fiq_debugger_begin_syslog_dump(struct fiq_debugger_state *state)
 460 {
 461         do_syslog(5 /* clear */, NULL, 0);
 462 }
 463
 464 static void fiq_debugger_end_syslog_dump(struct fiq_debugger_state *state)
 465 {
 466         fiq_debugger_dump_kernel_log(state);
 467 }
 468 #endif
 469
 470 static void fiq_debugger_do_sysrq(struct fiq_debugger_state *state, char rq)
 471 {
 472         if ((rq == 'g' || rq == 'G') && !fiq_kgdb_enable) {
 473                 fiq_debugger_printf(&state->output, "sysrq-g blocked\n");
 474                 return;
 475         }
 476         fiq_debugger_begin_syslog_dump(state);
 477         handle_sysrq(rq);
 478         fiq_debugger_end_syslog_dump(state);
 479 }
 480
 481 #ifdef CONFIG_KGDB
 482 static void fiq_debugger_do_kgdb(struct fiq_debugger_state *state)
 483 {
 484         if (!fiq_kgdb_enable) {
 485                 fiq_debugger_printf(&state->output, "kgdb through fiq debugger not enabled\n");
 486                 return;
 487         }
 488
 489         fiq_debugger_printf(&state->output, "enabling console and triggering kgdb\n");
 490         state->console_enable = true;
 491         handle_sysrq('g');
 492 }
 493 #endif
 494
 495 static void fiq_debugger_schedule_work(struct fiq_debugger_state *state,
 496                 char *cmd)
 497 {
 498         unsigned long flags;
 499
 500         spin_lock_irqsave(&state->work_lock, flags);
 501         if (state->work_cmd[0] != '\0') {
 502                 fiq_debugger_printf(&state->output, "work command processor busy\n");
 503                 spin_unlock_irqrestore(&state->work_lock, flags);
 504                 return;
 505         }
 506
 507         strlcpy(state->work_cmd, cmd, sizeof(state->work_cmd));
 508         spin_unlock_irqrestore(&state->work_lock, flags);
 509
 510         schedule_work(&state->work);
 511 }
 512
 513 static void fiq_debugger_work(struct work_struct *work)
 514 {
 515         struct fiq_debugger_state *state;
 516         char work_cmd[DEBUG_MAX];
 517         char *cmd;
 518         unsigned long flags;
 519
 520         state = container_of(work, struct fiq_debugger_state, work);
 521
 522         spin_lock_irqsave(&state->work_lock, flags);
 523
 524         strlcpy(work_cmd, state->work_cmd, sizeof(work_cmd));
 525         state->work_cmd[0] = '\0';
 526
 527         spin_unlock_irqrestore(&state->work_lock, flags);
 528
 529         cmd = work_cmd;
 530         if (!strncmp(cmd, "reboot", 6)) {
 531                 cmd += 6;
 532                 while (*cmd == ' ')
 533                         cmd++;
 534                 if (cmd != '\0')
 535                         kernel_restart(cmd);
 536                 else
 537                         kernel_restart(NULL);
 538         } else {
 539                 fiq_debugger_printf(&state->output, "unknown work command '%s'\n",
 540                                 work_cmd);
 541         }
 542 }
 543
 544 /* This function CANNOT be called in FIQ context */
 545 static void fiq_debugger_irq_exec(struct fiq_debugger_state *state, char *cmd)
 546 {
 547         int invalid_cmd = 0;
 548         if (!strcmp(cmd, "ps"))
 549                 fiq_debugger_do_ps(state);
 550         if (!strcmp(cmd, "sysrq"))
 551                 fiq_debugger_do_sysrq(state, 'h');
 552         if (!strncmp(cmd, "sysrq ", 6))
 553                 fiq_debugger_do_sysrq(state, cmd[6]);
 554 #ifdef CONFIG_KGDB
 555         if (!strcmp(cmd, "kgdb"))
 556                 fiq_debugger_do_kgdb(state);
 557 #endif
 558         if (!strncmp(cmd, "reboot", 6))
 559                 fiq_debugger_schedule_work(state, cmd);
 560 #ifdef CONFIG_ARCH_ROCKCHIP
 561         else {
 562                 invalid_cmd = 1;
 563                 memset(state->debug_buf, 0, DEBUG_MAX);
 564         }
 565
 566         if (invalid_cmd == 0) {
 567                 state->current_pointer = (state->current_pointer-1) & CMD_COUNT;
 568                 if (strcmp(state->cmd_buf[state->current_pointer], state->debug_buf)) {
 569                         state->current_pointer = (state->current_pointer+1) & CMD_COUNT;
 570                         memset(state->cmd_buf[state->current_pointer], 0, DEBUG_MAX);
 571                         strcpy(state->cmd_buf[state->current_pointer], state->debug_buf);
 572                 }
 573                 memset(state->debug_buf, 0, DEBUG_MAX);
 574                 state->current_pointer = (state->current_pointer+1) & CMD_COUNT;
 575                 state->back_pointer = state->current_pointer;
 576         }
 577 #endif
 578 }
 579
 580 #ifdef CONFIG_ARCH_ROCKCHIP
 581 static char cmd_buf[][16] = {
 582                 {"pc"},
 583                 {"regs"},
 584                 {"allregs"},
 585                 {"bt"},
 586                 {"reboot"},
 587                 {"irqs"},
 588                 {"kmsg"},
 589 #ifdef CONFIG_RK_LAST_LOG
 590                 {"last_kmsg"},
 591 #endif
 592                 {"version"},
 593                 {"sleep"},
 594                 {"nosleep"},
 595                 {"console"},
 596                 {"cpu"},
 597                 {"ps"},
 598                 {"sysrq"},
 599                 {"reset"},
 600 #ifdef CONFIG_KGDB
 601                 {"kgdb"},
 602 #endif
 603 };
 604 #endif
 605
 606
 607 static void fiq_debugger_help(struct fiq_debugger_state *state)
 608 {
 609         fiq_debugger_printf(&state->output,
 610                                 "FIQ Debugger commands:\n"
 611                                 " pc            PC status\n"
 612                                 " regs          Register dump\n"
 613                                 " allregs       Extended Register dump\n"
 614                                 " bt            Stack trace\n");
 615         fiq_debugger_printf(&state->output,
 616                                 " reboot [<c>]  Reboot with command <c>\n"
 617                                 " reset [<c>]   Hard reset with command <c>\n"
 618                                 " irqs          Interupt status\n"
 619                                 " kmsg          Kernel log\n"
 620                                 " version       Kernel version\n");
 621 #ifdef CONFIG_RK_LAST_LOG
 622         fiq_debugger_printf(&state->output,
 623                                 " last_kmsg     Last kernel log\n");
 624 #endif
 625         fiq_debugger_printf(&state->output,
 626                                 " sleep         Allow sleep while in FIQ\n"
 627                                 " nosleep       Disable sleep while in FIQ\n"
 628                                 " console       Switch terminal to console\n"
 629                                 " cpu           Current CPU\n"
 630                                 " cpu <number>  Switch to CPU<number>\n");
 631         fiq_debugger_printf(&state->output,
 632                                 " ps            Process list\n"
 633                                 " sysrq         sysrq options\n"
 634                                 " sysrq <param> Execute sysrq with <param>\n");
 635 #ifdef CONFIG_KGDB
 636         fiq_debugger_printf(&state->output,
 637                                 " kgdb          Enter kernel debugger\n");
 638 #endif
 639 }
 640
 641 static void fiq_debugger_take_affinity(void *info)
 642 {
 643         struct fiq_debugger_state *state = info;
 644         struct cpumask cpumask;
 645
 646         cpumask_clear(&cpumask);
 647         cpumask_set_cpu(get_cpu(), &cpumask);
 648
 649         irq_set_affinity(state->uart_irq, &cpumask);
 650 }
 651
 652 static void fiq_debugger_switch_cpu(struct fiq_debugger_state *state, int cpu)
 653 {
 654         if (!fiq_debugger_have_fiq(state))
 655                 smp_call_function_single(cpu, fiq_debugger_take_affinity, state,
 656                                 false);
 657 #ifdef CONFIG_ARCH_ROCKCHIP
 658         else {
 659 #ifdef CONFIG_FIQ_DEBUGGER_EL3_TO_EL1
 660                 if (state->pdata->switch_cpu)
 661                         state->pdata->switch_cpu(state->pdev, cpu);
 662 #else
 663                 struct cpumask cpumask;
 664
 665                 if (!cpu_online(cpu)) {
 666                         fiq_debugger_printf(&state->output, "cpu %d offline\n", cpu);
 667                         return;
 668                 }
 669
 670                 cpumask_clear(&cpumask);
 671                 cpumask_set_cpu(cpu, &cpumask);
 672
 673                 irq_set_affinity(state->fiq, &cpumask);
 674                 irq_set_affinity(state->uart_irq, &cpumask);
 675 #endif
 676         }
 677 #endif
 678         state->current_cpu = cpu;
 679 }
 680
 681 static bool fiq_debugger_fiq_exec(struct fiq_debugger_state *state,
 682                         const char *cmd, const struct pt_regs *regs,
 683                         void *svc_sp)
 684 {
 685         bool signal_helper = false;
 686
 687         if (!strcmp(cmd, "help") || !strcmp(cmd, "?")) {
 688                 fiq_debugger_help(state);
 689         } else if (!strcmp(cmd, "pc")) {
 690                 fiq_debugger_dump_pc(&state->output, regs);
 691         } else if (!strcmp(cmd, "regs")) {
 692                 fiq_debugger_dump_regs(&state->output, regs);
 693         } else if (!strcmp(cmd, "allregs")) {
 694                 fiq_debugger_dump_allregs(&state->output, regs);
 695         } else if (!strcmp(cmd, "bt")) {
 696                 fiq_debugger_dump_stacktrace(&state->output, regs, 100, svc_sp);
 697         } else if (!strncmp(cmd, "reset", 5)) {
 698                 cmd += 5;
 699                 while (*cmd == ' ')
 700                         cmd++;
 701                 if (*cmd) {
 702                         char tmp_cmd[32];
 703                         strlcpy(tmp_cmd, cmd, sizeof(tmp_cmd));
 704                         machine_restart(tmp_cmd);
 705                 } else {
 706                         machine_restart(NULL);
 707                 }
 708         } else if (!strcmp(cmd, "irqs")) {
 709                 fiq_debugger_dump_irqs(state);
 710         } else if (!strcmp(cmd, "kmsg")) {
 711                 fiq_debugger_dump_kernel_log(state);
 712 #ifdef CONFIG_RK_LAST_LOG
 713         } else if (!strcmp(cmd, "last_kmsg")) {
 714                 fiq_debugger_dump_last_kernel_log(state);
 715 #endif
 716         } else if (!strcmp(cmd, "version")) {
 717                 fiq_debugger_printf(&state->output, "%s\n", linux_banner);
 718         } else if (!strcmp(cmd, "sleep")) {
 719                 state->no_sleep = false;
 720                 fiq_debugger_printf(&state->output, "enabling sleep\n");
 721         } else if (!strcmp(cmd, "nosleep")) {
 722                 state->no_sleep = true;
 723                 fiq_debugger_printf(&state->output, "disabling sleep\n");
 724         } else if (!strcmp(cmd, "console")) {
 725                 fiq_debugger_printf(&state->output, "console mode\n");
 726                 fiq_debugger_uart_flush(state);
 727                 state->console_enable = true;
 728 #ifdef CONFIG_FIQ_DEBUGGER_EL3_TO_EL1
 729                 if (state->pdata->enable_debug)
 730                         state->pdata->enable_debug(state->pdev, false);
 731 #endif
 732         } else if (!strcmp(cmd, "cpu")) {
 733                 fiq_debugger_printf(&state->output, "cpu %d\n", state->current_cpu);
 734         } else if (!strncmp(cmd, "cpu ", 4)) {
 735                 unsigned long cpu = 0;
 736                 if (strict_strtoul(cmd + 4, 10, &cpu) == 0)
 737                         fiq_debugger_switch_cpu(state, cpu);
 738                 else
 739                         fiq_debugger_printf(&state->output, "invalid cpu\n");
 740                 fiq_debugger_printf(&state->output, "cpu %d\n", state->current_cpu);
 741         } else {
 742                 if (state->debug_busy) {
 743                         fiq_debugger_printf(&state->output,
 744                                 "command processor busy. trying to abort.\n");
 745                         state->debug_abort = -1;
 746                 } else {
 747                         strcpy(state->debug_cmd, cmd);
 748                         state->debug_busy = 1;
 749                 }
 750
 751                 return true;
 752         }
 753         if (!state->console_enable)
 754                 fiq_debugger_prompt(state);
 755
 756         return signal_helper;
 757 }
 758
 759 static void fiq_debugger_sleep_timer_expired(unsigned long data)
 760 {
 761         struct fiq_debugger_state *state = (struct fiq_debugger_state *)data;
 762         unsigned long flags;
 763
 764         spin_lock_irqsave(&state->sleep_timer_lock, flags);
 765         if (state->uart_enabled && !state->no_sleep) {
 766                 if (state->debug_enable && !state->console_enable) {
 767                         state->debug_enable = false;
 768                         fiq_debugger_printf_nfiq(state,
 769                                         "suspending fiq debugger\n");
 770                 }
 771                 state->ignore_next_wakeup_irq = true;
 772                 fiq_debugger_uart_disable(state);
 773                 state->uart_enabled = false;
 774                 fiq_debugger_enable_wakeup_irq(state);
 775         }
 776         wake_unlock(&state->debugger_wake_lock);
 777         spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
 778 }
 779
 780 static void fiq_debugger_handle_wakeup(struct fiq_debugger_state *state)
 781 {
 782         unsigned long flags;
 783
 784         spin_lock_irqsave(&state->sleep_timer_lock, flags);
 785         if (state->wakeup_irq >= 0 && state->ignore_next_wakeup_irq) {
 786                 state->ignore_next_wakeup_irq = false;
 787         } else if (!state->uart_enabled) {
 788                 wake_lock(&state->debugger_wake_lock);
 789                 fiq_debugger_uart_enable(state);
 790                 state->uart_enabled = true;
 791                 fiq_debugger_disable_wakeup_irq(state);
 792                 mod_timer(&state->sleep_timer, jiffies + HZ / 2);
 793         }
 794         spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
 795 }
 796
 797 static irqreturn_t fiq_debugger_wakeup_irq_handler(int irq, void *dev)
 798 {
 799         struct fiq_debugger_state *state = dev;
 800
 801         if (!state->no_sleep)
 802                 fiq_debugger_puts(state, "WAKEUP\n");
 803         fiq_debugger_handle_wakeup(state);
 804
 805         return IRQ_HANDLED;
 806 }
 807
 808 static
 809 void fiq_debugger_handle_console_irq_context(struct fiq_debugger_state *state)
 810 {
 811 #if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
 812         if (state->tty_port.ops) {
 813                 int i;
 814                 int count = fiq_debugger_ringbuf_level(state->tty_rbuf);
 815                 for (i = 0; i < count; i++) {
 816                         int c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0);
 817                         tty_insert_flip_char(&state->tty_port, c, TTY_NORMAL);
 818                         if (!fiq_debugger_ringbuf_consume(state->tty_rbuf, 1))
 819                                 pr_warn("fiq tty failed to consume byte\n");
 820                 }
 821                 tty_flip_buffer_push(&state->tty_port);
 822         }
 823 #endif
 824 }
 825
 826 static void fiq_debugger_handle_irq_context(struct fiq_debugger_state *state)
 827 {
 828         if (!state->no_sleep) {
 829                 unsigned long flags;
 830
 831                 spin_lock_irqsave(&state->sleep_timer_lock, flags);
 832                 wake_lock(&state->debugger_wake_lock);
 833                 mod_timer(&state->sleep_timer, jiffies + HZ * 5);
 834                 spin_unlock_irqrestore(&state->sleep_timer_lock, flags);
 835         }
 836         fiq_debugger_handle_console_irq_context(state);
 837         if (state->debug_busy) {
 838                 fiq_debugger_irq_exec(state, state->debug_cmd);
 839                 if (!state->console_enable)
 840                         fiq_debugger_prompt(state);
 841                 state->debug_busy = 0;
 842         }
 843 }
 844
 845 static int fiq_debugger_getc(struct fiq_debugger_state *state)
 846 {
 847         return state->pdata->uart_getc(state->pdev);
 848 }
 849
 850 static int fiq_debugger_cmd_check_back(struct fiq_debugger_state *state, char c)
 851 {
 852         char *s;
 853         int i = 0;
 854         if (c == 'A') {
 855                 state->back_pointer = (state->back_pointer-1) & CMD_COUNT;
 856                 if (state->back_pointer != state->current_pointer) {
 857                         s = state->cmd_buf[state->back_pointer];
 858                         if (*s != 0) {
 859                                 for(i = 0; i < strlen(state->debug_buf)-1; i++) {
 860                                         state->pdata->uart_putc(state->pdev, 8);
 861                                         state->pdata->uart_putc(state->pdev, ' ');
 862                                         state->pdata->uart_putc(state->pdev, 8);
 863                                 }
 864                                 memset(state->debug_buf, 0, DEBUG_MAX);
 865                                 strcpy(state->debug_buf, s);
 866                                 state->debug_count = strlen(state->debug_buf);
 867                                 fiq_debugger_printf(&state->output, state->debug_buf);
 868                         } else {
 869                                 state->back_pointer = (state->back_pointer+1) & CMD_COUNT;
 870                         }
 871
 872                 } else {
 873                         state->back_pointer = (state->back_pointer+1) & CMD_COUNT;
 874                 }
 875         } else if (c == 'B') {
 876
 877                 if (state->back_pointer != state->current_pointer) {
 878                         state->back_pointer = (state->back_pointer+1) & CMD_COUNT;
 879                         if(state->back_pointer == state->current_pointer){
 880                                 goto cmd_clear;
 881                         } else {
 882                                 s = state->cmd_buf[state->back_pointer];
 883                                 if (*s != 0) {
 884                                         for(i = 0; i < strlen(state->debug_buf)-1; i++) {
 885                                                 state->pdata->uart_putc(state->pdev, 8);
 886                                                 state->pdata->uart_putc(state->pdev, ' ');
 887                                                 state->pdata->uart_putc(state->pdev, 8);
 888                                         }
 889                                         memset(state->debug_buf, 0, DEBUG_MAX);
 890                                         strcpy(state->debug_buf, s);
 891                                         state->debug_count = strlen(state->debug_buf);
 892                                         fiq_debugger_printf(&state->output, state->debug_buf);
 893                                 }
 894                         }
 895                 } else {
 896 cmd_clear:
 897                         for(i = 0; i < strlen(state->debug_buf)-1; i++) {
 898                                 state->pdata->uart_putc(state->pdev, 8);
 899                                 state->pdata->uart_putc(state->pdev, ' ');
 900                                 state->pdata->uart_putc(state->pdev, 8);
 901                         }
 902                         memset(state->debug_buf, 0, DEBUG_MAX);
 903                         state->debug_count = 0;
 904                 }
 905         }
 906         return 0;
 907 }
 908
 909 static void fiq_debugger_cmd_tab(struct fiq_debugger_state *state)
 910 {
 911         int i,j;
 912         int count = 0;
 913
 914         for (i = 0; i < ARRAY_SIZE(cmd_buf); i++) {
 915                 cmd_buf[i][15] = 1;
 916         }
 917
 918         for (j = 1; j <= strlen(state->debug_buf); j++) {
 919                 count = 0;
 920                 for (i = 0; i < ARRAY_SIZE(cmd_buf); i++) {
 921                         if (cmd_buf[i][15] == 1) {
 922                                 if (strncmp(state->debug_buf, cmd_buf[i], j)) {
 923                                         cmd_buf[i][15] = 0;
 924                                 } else {
 925                                         count++;
 926                                 }
 927                         }
 928                 }
 929                 if (count == 0)
 930                         break;
 931         }
 932
 933         if (count == 1) {
 934                 for (i = 0; i < ARRAY_SIZE(cmd_buf); i++) {
 935                         if (cmd_buf[i][15] == 1)
 936                                 break;
 937                 }
 938
 939                 for(j = 0; j < strlen(state->debug_buf); j++) {
 940                         state->pdata->uart_putc(state->pdev, 8);
 941                         state->pdata->uart_putc(state->pdev, ' ');
 942                         state->pdata->uart_putc(state->pdev, 8);
 943                 }
 944                 memset(state->debug_buf, 0, DEBUG_MAX);
 945                 strcpy(state->debug_buf, cmd_buf[i]);
 946                 state->debug_count = strlen(state->debug_buf);
 947                 fiq_debugger_printf(&state->output, state->debug_buf);
 948
 949         }
 950 }
 951
 952 static bool fiq_debugger_handle_uart_interrupt(struct fiq_debugger_state *state,
 953                         int this_cpu, const struct pt_regs *regs, void *svc_sp)
 954 {
 955         int c;
 956         static int last_c;
 957         int count = 0;
 958         bool signal_helper = false;
 959         unsigned long ms = 0;
 960
 961         if (this_cpu != state->current_cpu) {
 962                 if (state->in_fiq)
 963                         return false;
 964
 965                 if (atomic_inc_return(&state->unhandled_fiq_count) !=
 966                                         MAX_UNHANDLED_FIQ_COUNT)
 967                         return false;
 968
 969                 fiq_debugger_printf(&state->output,
 970                         "fiq_debugger: cpu %d not responding, "
 971                         "reverting to cpu %d\n", state->current_cpu,
 972                         this_cpu);
 973
 974                 atomic_set(&state->unhandled_fiq_count, 0);
 975                 fiq_debugger_switch_cpu(state, this_cpu);
 976                 return false;
 977         }
 978
 979         state->in_fiq = true;
 980
 981         while ((c = fiq_debugger_getc(state)) != FIQ_DEBUGGER_NO_CHAR) {
 982                 recv_count0++;
 983                 if((recv_count0 - recv_count1) > 128) {
 984                         ms = jiffies_to_msecs(jiffies - jif);
 985                         if(ms < 1000) {
 986                                 if(cpu_is_rk3288()){
 987                                         writel_relaxed((0x00c0 << 16),
 988                                         RK_GRF_VIRT + RK3288_GRF_UOC0_CON3);
 989                                 }
 990                         }
 991                         jif = jiffies;
 992                         recv_count1 = recv_count0;
 993                 }
 994                 count++;
 995                 if (!state->debug_enable) {
 996                         if ((c == 13) || (c == 10)) {
 997                                 state->debug_enable = true;
 998                                 state->debug_count = 0;
 999                                 fiq_debugger_prompt(state);
1000                         }
1001                 } else if (c == FIQ_DEBUGGER_BREAK) {
1002                         state->console_enable = false;
1003 #ifdef CONFIG_ARCH_ROCKCHIP
1004                         fiq_debugger_puts(state, "\nWelcome to ");
1005 #endif
1006                         if (fiq_debugger_have_fiq(state))
1007                                 fiq_debugger_puts(state,
1008                                                   "fiq debugger mode\n");
1009                         else
1010                                 fiq_debugger_puts(state,
1011                                                   "irq debugger mode\n");
1012
1013                         state->debug_count = 0;
1014 #ifdef CONFIG_ARCH_ROCKCHIP
1015                         fiq_debugger_puts(state, "Enter ? to get command help\n");
1016                         state->back_pointer = CMD_COUNT;
1017                         state->current_pointer = CMD_COUNT;
1018                         memset(state->cmd_buf, 0, (CMD_COUNT+1)*DEBUG_MAX);
1019 #endif
1020
1021 #ifdef CONFIG_FIQ_DEBUGGER_EL3_TO_EL1
1022                         if (state->pdata->enable_debug)
1023                                 state->pdata->enable_debug(state->pdev, true);
1024 #endif
1025                         fiq_debugger_prompt(state);
1026 #ifdef CONFIG_FIQ_DEBUGGER_CONSOLE
1027                 } else if (state->console_enable && state->tty_rbuf) {
1028                         fiq_debugger_ringbuf_push(state->tty_rbuf, c);
1029                         signal_helper = true;
1030 #endif
1031 #ifdef CONFIG_ARCH_ROCKCHIP
1032                 } else if (last_c == '[' && (c == 'A' || c == 'B' || c == 'C' || c == 'D')) {
1033                         if (state->debug_count > 0) {
1034                                 state->debug_count--;
1035                                 state->pdata->uart_putc(state->pdev, 8);
1036                                 state->pdata->uart_putc(state->pdev, ' ');
1037                                 state->pdata->uart_putc(state->pdev, 8);
1038                         }
1039                         fiq_debugger_cmd_check_back(state, c);
1040                         //tab
1041                 } else if (c == 9) {
1042                         fiq_debugger_cmd_tab(state);
1043 #endif
1044                 } else if ((c >= ' ') && (c < 127)) {
1045                         if (state->debug_count < (DEBUG_MAX - 1)) {
1046                                 state->debug_buf[state->debug_count++] = c;
1047                                 fiq_debugger_putc(state, c);
1048                         }
1049                 } else if ((c == 8) || (c == 127)) {
1050                         if (state->debug_count > 0) {
1051                                 state->debug_count--;
1052                                 fiq_debugger_putc(state, 8);
1053                                 fiq_debugger_putc(state, ' ');
1054                                 fiq_debugger_putc(state, 8);
1055                         }
1056                 } else if ((c == 13) || (c == 10)) {
1057                         if (c == '\r' || (c == '\n' && last_c != '\r')) {
1058                                 fiq_debugger_putc(state, '\r');
1059                                 fiq_debugger_putc(state, '\n');
1060                         }
1061                         if (state->debug_count) {
1062                                 state->debug_buf[state->debug_count] = 0;
1063                                 state->debug_count = 0;
1064                                 signal_helper |=
1065                                         fiq_debugger_fiq_exec(state,
1066                                                         state->debug_buf,
1067                                                        regs, svc_sp);
1068 #ifdef CONFIG_ARCH_ROCKCHIP
1069                                 if (signal_helper == false) {
1070                                         state->current_pointer = (state->current_pointer-1) & CMD_COUNT;
1071                                         if (strcmp(state->cmd_buf[state->current_pointer], state->debug_buf)) {
1072                                                 state->current_pointer = (state->current_pointer+1) & CMD_COUNT;
1073                                                 memset(state->cmd_buf[state->current_pointer], 0, DEBUG_MAX);
1074                                                 strcpy(state->cmd_buf[state->current_pointer], state->debug_buf);
1075                                         }
1076                                         memset(state->debug_buf, 0, DEBUG_MAX);
1077                                         state->current_pointer = (state->current_pointer+1) & CMD_COUNT;
1078                                         state->back_pointer = state->current_pointer;
1079                                 }
1080 #endif
1081                         } else {
1082                                 fiq_debugger_prompt(state);
1083                         }
1084                 }
1085                 last_c = c;
1086         }
1087         if (!state->console_enable)
1088                 fiq_debugger_uart_flush(state);
1089         if (state->pdata->fiq_ack)
1090                 state->pdata->fiq_ack(state->pdev, state->fiq);
1091
1092         /* poke sleep timer if necessary */
1093         if (state->debug_enable && !state->no_sleep)
1094                 signal_helper = true;
1095
1096         atomic_set(&state->unhandled_fiq_count, 0);
1097         state->in_fiq = false;
1098
1099         return signal_helper;
1100 }
1101
1102 #ifdef CONFIG_FIQ_GLUE
1103 static void fiq_debugger_fiq(struct fiq_glue_handler *h,
1104                 void *regs, void *svc_sp)
1105 {
1106         struct fiq_debugger_state *state =
1107                 container_of(h, struct fiq_debugger_state, handler);
1108         unsigned int this_cpu = THREAD_INFO(svc_sp)->cpu;
1109         bool need_irq;
1110
1111         /* RK2928 USB-UART function, otg dp/dm default in uart status;
1112          * connect with otg cable&usb device, dp/dm will be hi-z status
1113          * and make uart controller enter infinite fiq loop
1114          */
1115 #ifdef CONFIG_RK_USB_UART
1116         if (cpu_is_rk3188()) {
1117                 if (!(readl_relaxed(RK_GRF_VIRT + RK3188_GRF_SOC_STATUS0) & (1 << 13)) ||
1118                      (readl_relaxed(RK_GRF_VIRT + RK3188_GRF_SOC_STATUS0) & (1 << 10))) {
1119                         /* id low or bvalid high, enter usb phy */
1120                         writel_relaxed((0x0300 << 16), RK_GRF_VIRT + RK3188_GRF_UOC0_CON0);
1121                 }
1122         } else if (cpu_is_rk3288()) {
1123                 if (!(readl_relaxed(RK_GRF_VIRT + RK3288_GRF_SOC_STATUS2) & (1 << 17)) ||
1124                      (readl_relaxed(RK_GRF_VIRT + RK3288_GRF_SOC_STATUS2) & (1 << 14))) {
1125                         /* id low or bvalid high, enter usb phy */
1126                         writel_relaxed((0x00c0 << 16), RK_GRF_VIRT + RK3288_GRF_UOC0_CON3);
1127                 }
1128         }
1129 #endif
1130         need_irq = fiq_debugger_handle_uart_interrupt(state, this_cpu, regs,
1131                         svc_sp);
1132         if (need_irq)
1133                 fiq_debugger_force_irq(state);
1134 }
1135 #endif
1136
1137 /*
1138  * When not using FIQs, we only use this single interrupt as an entry point.
1139  * This just effectively takes over the UART interrupt and does all the work
1140  * in this context.
1141  */
1142 static irqreturn_t fiq_debugger_uart_irq(int irq, void *dev)
1143 {
1144         struct fiq_debugger_state *state = dev;
1145         bool not_done;
1146
1147         fiq_debugger_handle_wakeup(state);
1148
1149         /* handle the debugger irq in regular context */
1150         not_done = fiq_debugger_handle_uart_interrupt(state, smp_processor_id(),
1151                                               get_irq_regs(),
1152                                               current_thread_info());
1153         if (not_done)
1154                 fiq_debugger_handle_irq_context(state);
1155
1156         return IRQ_HANDLED;
1157 }
1158
1159 #ifdef CONFIG_FIQ_DEBUGGER_EL3_TO_EL1
1160 void fiq_debugger_fiq(void *regs)
1161 {
1162         struct fiq_debugger_state *state = state_tf;
1163         bool need_irq;
1164
1165         if (!state)
1166                 return;
1167         need_irq = fiq_debugger_handle_uart_interrupt(state, smp_processor_id(),
1168                                                       regs,
1169                                                       current_thread_info());
1170         if (need_irq)
1171                 fiq_debugger_force_irq(state);
1172 }
1173 #endif
1174
1175 /*
1176  * If FIQs are used, not everything can happen in fiq context.
1177  * FIQ handler does what it can and then signals this interrupt to finish the
1178  * job in irq context.
1179  */
1180 static irqreturn_t fiq_debugger_signal_irq(int irq, void *dev)
1181 {
1182         struct fiq_debugger_state *state = dev;
1183
1184         if (state->pdata->force_irq_ack)
1185                 state->pdata->force_irq_ack(state->pdev, state->signal_irq);
1186
1187         fiq_debugger_handle_irq_context(state);
1188
1189         return IRQ_HANDLED;
1190 }
1191
1192 #ifdef CONFIG_FIQ_GLUE
1193 static void fiq_debugger_resume(struct fiq_glue_handler *h)
1194 {
1195         struct fiq_debugger_state *state =
1196                 container_of(h, struct fiq_debugger_state, handler);
1197         if (state->pdata->uart_resume)
1198                 state->pdata->uart_resume(state->pdev);
1199 }
1200 #endif
1201
1202 #if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
1203 struct tty_driver *fiq_debugger_console_device(struct console *co, int *index)
1204 {
1205         *index = co->index;
1206         return fiq_tty_driver;
1207 }
1208
1209 static void fiq_debugger_console_write(struct console *co,
1210                                 const char *s, unsigned int count)
1211 {
1212         struct fiq_debugger_state *state;
1213         unsigned long flags;
1214
1215         state = container_of(co, struct fiq_debugger_state, console);
1216
1217         if (!state->console_enable && !state->syslog_dumping)
1218                 return;
1219
1220 #ifdef CONFIG_RK_CONSOLE_THREAD
1221         if (state->pdata->console_write) {
1222                 state->pdata->console_write(state->pdev, s, count);
1223                 return;
1224         }
1225 #endif
1226
1227         fiq_debugger_uart_enable(state);
1228         spin_lock_irqsave(&state->console_lock, flags);
1229         while (count--) {
1230                 if (*s == '\n')
1231                         fiq_debugger_putc(state, '\r');
1232                 fiq_debugger_putc(state, *s++);
1233         }
1234         fiq_debugger_uart_flush(state);
1235         spin_unlock_irqrestore(&state->console_lock, flags);
1236         fiq_debugger_uart_disable(state);
1237 }
1238
1239 static struct console fiq_debugger_console = {
1240         .name = "ttyFIQ",
1241         .device = fiq_debugger_console_device,
1242         .write = fiq_debugger_console_write,
1243         .flags = CON_PRINTBUFFER | CON_ANYTIME | CON_ENABLED,
1244 };
1245
1246 int fiq_tty_open(struct tty_struct *tty, struct file *filp)
1247 {
1248         int line = tty->index;
1249         struct fiq_debugger_state **states = tty->driver->driver_state;
1250         struct fiq_debugger_state *state = states[line];
1251
1252         return tty_port_open(&state->tty_port, tty, filp);
1253 }
1254
1255 void fiq_tty_close(struct tty_struct *tty, struct file *filp)
1256 {
1257         tty_port_close(tty->port, tty, filp);
1258 }
1259
1260 int  fiq_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
1261 {
1262         int i;
1263         int line = tty->index;
1264         struct fiq_debugger_state **states = tty->driver->driver_state;
1265         struct fiq_debugger_state *state = states[line];
1266
1267         if (!state->console_enable)
1268                 return count;
1269
1270         fiq_debugger_uart_enable(state);
1271         spin_lock_irq(&state->console_lock);
1272         for (i = 0; i < count; i++)
1273                 fiq_debugger_putc(state, *buf++);
1274         spin_unlock_irq(&state->console_lock);
1275         fiq_debugger_uart_disable(state);
1276
1277         return count;
1278 }
1279
1280 int  fiq_tty_write_room(struct tty_struct *tty)
1281 {
1282         return 16;
1283 }
1284
1285 #ifdef CONFIG_CONSOLE_POLL
1286 static int fiq_tty_poll_init(struct tty_driver *driver, int line, char *options)
1287 {
1288         return 0;
1289 }
1290
1291 static int fiq_tty_poll_get_char(struct tty_driver *driver, int line)
1292 {
1293         struct fiq_debugger_state **states = driver->driver_state;
1294         struct fiq_debugger_state *state = states[line];
1295         int c = NO_POLL_CHAR;
1296
1297         fiq_debugger_uart_enable(state);
1298         if (fiq_debugger_have_fiq(state)) {
1299                 int count = fiq_debugger_ringbuf_level(state->tty_rbuf);
1300                 if (count > 0) {
1301                         c = fiq_debugger_ringbuf_peek(state->tty_rbuf, 0);
1302                         fiq_debugger_ringbuf_consume(state->tty_rbuf, 1);
1303                 }
1304         } else {
1305                 c = fiq_debugger_getc(state);
1306                 if (c == FIQ_DEBUGGER_NO_CHAR)
1307                         c = NO_POLL_CHAR;
1308         }
1309         fiq_debugger_uart_disable(state);
1310
1311         return c;
1312 }
1313
1314 static void fiq_tty_poll_put_char(struct tty_driver *driver, int line, char ch)
1315 {
1316         struct fiq_debugger_state **states = driver->driver_state;
1317         struct fiq_debugger_state *state = states[line];
1318         fiq_debugger_uart_enable(state);
1319         fiq_debugger_putc(state, ch);
1320         fiq_debugger_uart_disable(state);
1321 }
1322 #endif
1323
1324 static const struct tty_port_operations fiq_tty_port_ops;
1325
1326 static const struct tty_operations fiq_tty_driver_ops = {
1327         .write = fiq_tty_write,
1328         .write_room = fiq_tty_write_room,
1329         .open = fiq_tty_open,
1330         .close = fiq_tty_close,
1331 #ifdef CONFIG_CONSOLE_POLL
1332         .poll_init = fiq_tty_poll_init,
1333         .poll_get_char = fiq_tty_poll_get_char,
1334         .poll_put_char = fiq_tty_poll_put_char,
1335 #endif
1336 };
1337
1338 static int fiq_debugger_tty_init(void)
1339 {
1340         int ret;
1341         struct fiq_debugger_state **states = NULL;
1342
1343         states = kzalloc(sizeof(*states) * MAX_FIQ_DEBUGGER_PORTS, GFP_KERNEL);
1344         if (!states) {
1345                 pr_err("Failed to allocate fiq debugger state structres\n");
1346                 return -ENOMEM;
1347         }
1348
1349         fiq_tty_driver = alloc_tty_driver(MAX_FIQ_DEBUGGER_PORTS);
1350         if (!fiq_tty_driver) {
1351                 pr_err("Failed to allocate fiq debugger tty\n");
1352                 ret = -ENOMEM;
1353                 goto err_free_state;
1354         }
1355
1356         fiq_tty_driver->owner           = THIS_MODULE;
1357         fiq_tty_driver->driver_name     = "fiq-debugger";
1358         fiq_tty_driver->name            = "ttyFIQ";
1359         fiq_tty_driver->type            = TTY_DRIVER_TYPE_SERIAL;
1360         fiq_tty_driver->subtype         = SERIAL_TYPE_NORMAL;
1361         fiq_tty_driver->init_termios    = tty_std_termios;
1362         fiq_tty_driver->flags           = TTY_DRIVER_REAL_RAW |
1363                                           TTY_DRIVER_DYNAMIC_DEV;
1364         fiq_tty_driver->driver_state    = states;
1365
1366         fiq_tty_driver->init_termios.c_cflag =
1367                                         B115200 | CS8 | CREAD | HUPCL | CLOCAL;
1368         fiq_tty_driver->init_termios.c_ispeed = 115200;
1369         fiq_tty_driver->init_termios.c_ospeed = 115200;
1370
1371         tty_set_operations(fiq_tty_driver, &fiq_tty_driver_ops);
1372
1373         ret = tty_register_driver(fiq_tty_driver);
1374         if (ret) {
1375                 pr_err("Failed to register fiq tty: %d\n", ret);
1376                 goto err_free_tty;
1377         }
1378
1379         pr_info("Registered FIQ tty driver\n");
1380         return 0;
1381
1382 err_free_tty:
1383         put_tty_driver(fiq_tty_driver);
1384         fiq_tty_driver = NULL;
1385 err_free_state:
1386         kfree(states);
1387         return ret;
1388 }
1389
1390 static int fiq_debugger_tty_init_one(struct fiq_debugger_state *state)
1391 {
1392         int ret;
1393         struct device *tty_dev;
1394         struct fiq_debugger_state **states = fiq_tty_driver->driver_state;
1395
1396         states[state->pdev->id] = state;
1397
1398         state->tty_rbuf = fiq_debugger_ringbuf_alloc(1024);
1399         if (!state->tty_rbuf) {
1400                 pr_err("Failed to allocate fiq debugger ringbuf\n");
1401                 ret = -ENOMEM;
1402                 goto err;
1403         }
1404
1405         tty_port_init(&state->tty_port);
1406         state->tty_port.ops = &fiq_tty_port_ops;
1407
1408         tty_dev = tty_port_register_device(&state->tty_port, fiq_tty_driver,
1409                                            state->pdev->id, &state->pdev->dev);
1410         if (IS_ERR(tty_dev)) {
1411                 pr_err("Failed to register fiq debugger tty device\n");
1412                 ret = PTR_ERR(tty_dev);
1413                 goto err;
1414         }
1415
1416         device_set_wakeup_capable(tty_dev, 1);
1417
1418         pr_info("Registered fiq debugger ttyFIQ%d\n", state->pdev->id);
1419
1420         return 0;
1421
1422 err:
1423         fiq_debugger_ringbuf_free(state->tty_rbuf);
1424         state->tty_rbuf = NULL;
1425         return ret;
1426 }
1427 #endif
1428
1429 static int fiq_debugger_dev_suspend(struct device *dev)
1430 {
1431         struct platform_device *pdev = to_platform_device(dev);
1432         struct fiq_debugger_state *state = platform_get_drvdata(pdev);
1433
1434         if (state->pdata->uart_dev_suspend)
1435                 return state->pdata->uart_dev_suspend(pdev);
1436         return 0;
1437 }
1438
1439 static int fiq_debugger_dev_resume(struct device *dev)
1440 {
1441         struct platform_device *pdev = to_platform_device(dev);
1442         struct fiq_debugger_state *state = platform_get_drvdata(pdev);
1443
1444         if (state->pdata->uart_dev_resume)
1445                 return state->pdata->uart_dev_resume(pdev);
1446         return 0;
1447 }
1448
1449 static int fiq_debugger_probe(struct platform_device *pdev)
1450 {
1451         int ret;
1452         struct fiq_debugger_pdata *pdata = dev_get_platdata(&pdev->dev);
1453         struct fiq_debugger_state *state;
1454         int fiq;
1455         int uart_irq;
1456
1457         if (pdev->id >= MAX_FIQ_DEBUGGER_PORTS)
1458                 return -EINVAL;
1459
1460         if (!pdata->uart_getc || !pdata->uart_putc)
1461                 return -EINVAL;
1462         if ((pdata->uart_enable && !pdata->uart_disable) ||
1463             (!pdata->uart_enable && pdata->uart_disable))
1464                 return -EINVAL;
1465
1466         fiq = platform_get_irq_byname(pdev, "fiq");
1467         uart_irq = platform_get_irq_byname(pdev, "uart_irq");
1468
1469         /* uart_irq mode and fiq mode are mutually exclusive, but one of them
1470          * is required */
1471         if ((uart_irq < 0 && fiq < 0) || (uart_irq >= 0 && fiq >= 0))
1472                 return -EINVAL;
1473         if (fiq >= 0 && !pdata->fiq_enable)
1474                 return -EINVAL;
1475
1476         state = kzalloc(sizeof(*state), GFP_KERNEL);
1477         state->output.printf = fiq_debugger_printf;
1478         setup_timer(&state->sleep_timer, fiq_debugger_sleep_timer_expired,
1479                     (unsigned long)state);
1480         state->pdata = pdata;
1481         state->pdev = pdev;
1482         state->no_sleep = initial_no_sleep;
1483         state->debug_enable = initial_debug_enable;
1484         state->console_enable = initial_console_enable;
1485
1486         state->fiq = fiq;
1487 #ifdef CONFIG_FIQ_DEBUGGER_EL3_TO_EL1
1488         if (fiq > 0)
1489                 state->uart_irq = fiq;
1490         else
1491                 state->uart_irq = uart_irq;
1492 #else
1493         state->uart_irq = uart_irq;
1494 #endif
1495
1496         state->signal_irq = platform_get_irq_byname(pdev, "signal");
1497         state->wakeup_irq = platform_get_irq_byname(pdev, "wakeup");
1498
1499         INIT_WORK(&state->work, fiq_debugger_work);
1500         spin_lock_init(&state->work_lock);
1501
1502         platform_set_drvdata(pdev, state);
1503
1504         spin_lock_init(&state->sleep_timer_lock);
1505
1506         if (state->wakeup_irq < 0 && fiq_debugger_have_fiq(state))
1507                 state->no_sleep = true;
1508         state->ignore_next_wakeup_irq = !state->no_sleep;
1509
1510         wake_lock_init(&state->debugger_wake_lock,
1511                         WAKE_LOCK_SUSPEND, "serial-debug");
1512
1513         state->clk = clk_get(&pdev->dev, NULL);
1514         if (IS_ERR(state->clk))
1515                 state->clk = NULL;
1516
1517         /* do not call pdata->uart_enable here since uart_init may still
1518          * need to do some initialization before uart_enable can work.
1519          * So, only try to manage the clock during init.
1520          */
1521         if (state->clk)
1522                 clk_enable(state->clk);
1523
1524         if (pdata->uart_init) {
1525                 ret = pdata->uart_init(pdev);
1526                 if (ret)
1527                         goto err_uart_init;
1528         }
1529
1530         fiq_debugger_printf_nfiq(state,
1531                                 "<hit enter %sto activate fiq debugger>\n",
1532                                 state->no_sleep ? "" : "twice ");
1533
1534 #ifdef CONFIG_FIQ_GLUE
1535         if (fiq_debugger_have_fiq(state)) {
1536                 state->handler.fiq = fiq_debugger_fiq;
1537                 state->handler.resume = fiq_debugger_resume;
1538                 ret = fiq_glue_register_handler(&state->handler);
1539                 if (ret) {
1540                         pr_err("%s: could not install fiq handler\n", __func__);
1541                         goto err_register_irq;
1542                 }
1543 #ifdef CONFIG_ARCH_ROCKCHIP
1544                 //set state->fiq to secure state, so fiq is avalable
1545                 gic_set_irq_secure(irq_get_irq_data(state->fiq));
1546                 //set state->fiq priority a little higher than other interrupts (normal is 0xa0)
1547                 gic_set_irq_priority(irq_get_irq_data(state->fiq), 0x90);
1548 #endif
1549                 pdata->fiq_enable(pdev, state->fiq, 1);
1550         } else
1551 #endif
1552         {
1553                 ret = request_irq(state->uart_irq, fiq_debugger_uart_irq,
1554                                   IRQF_NO_SUSPEND, "debug", state);
1555                 if (ret) {
1556                         pr_err("%s: could not install irq handler\n", __func__);
1557                         goto err_register_irq;
1558                 }
1559
1560                 /* for irq-only mode, we want this irq to wake us up, if it
1561                  * can.
1562                  */
1563                 enable_irq_wake(state->uart_irq);
1564         }
1565
1566         if (state->clk)
1567                 clk_disable(state->clk);
1568
1569         if (state->signal_irq >= 0) {
1570                 ret = request_irq(state->signal_irq, fiq_debugger_signal_irq,
1571                           IRQF_TRIGGER_RISING, "debug-signal", state);
1572                 if (ret)
1573                         pr_err("serial_debugger: could not install signal_irq");
1574         }
1575
1576         if (state->wakeup_irq >= 0) {
1577                 ret = request_irq(state->wakeup_irq,
1578                                   fiq_debugger_wakeup_irq_handler,
1579                                   IRQF_TRIGGER_FALLING | IRQF_DISABLED,
1580                                   "debug-wakeup", state);
1581                 if (ret) {
1582                         pr_err("serial_debugger: "
1583                                 "could not install wakeup irq\n");
1584                         state->wakeup_irq = -1;
1585                 } else {
1586                         ret = enable_irq_wake(state->wakeup_irq);
1587                         if (ret) {
1588                                 pr_err("serial_debugger: "
1589                                         "could not enable wakeup\n");
1590                                 state->wakeup_irq_no_set_wake = true;
1591                         }
1592                 }
1593         }
1594         if (state->no_sleep)
1595                 fiq_debugger_handle_wakeup(state);
1596
1597 #ifdef CONFIG_FIQ_DEBUGGER_EL3_TO_EL1
1598         state_tf = state;
1599 #endif
1600
1601 #if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
1602         spin_lock_init(&state->console_lock);
1603         state->console = fiq_debugger_console;
1604         state->console.index = pdev->id;
1605         if (!console_set_on_cmdline)
1606                 add_preferred_console(state->console.name,
1607                         state->console.index, NULL);
1608         register_console(&state->console);
1609         fiq_debugger_tty_init_one(state);
1610 #endif
1611         return 0;
1612
1613 err_register_irq:
1614         if (pdata->uart_free)
1615                 pdata->uart_free(pdev);
1616 err_uart_init:
1617         if (state->clk)
1618                 clk_disable(state->clk);
1619         if (state->clk)
1620                 clk_put(state->clk);
1621         wake_lock_destroy(&state->debugger_wake_lock);
1622         platform_set_drvdata(pdev, NULL);
1623         kfree(state);
1624         return ret;
1625 }
1626
1627 static const struct dev_pm_ops fiq_debugger_dev_pm_ops = {
1628         .suspend        = fiq_debugger_dev_suspend,
1629         .resume         = fiq_debugger_dev_resume,
1630 };
1631
1632 static struct platform_driver fiq_debugger_driver = {
1633         .probe  = fiq_debugger_probe,
1634         .driver = {
1635                 .name   = "fiq_debugger",
1636                 .pm     = &fiq_debugger_dev_pm_ops,
1637         },
1638 };
1639
1640 static int __init fiq_debugger_init(void)
1641 {
1642 #if defined(CONFIG_FIQ_DEBUGGER_CONSOLE)
1643         fiq_debugger_tty_init();
1644 #endif
1645         return platform_driver_register(&fiq_debugger_driver);
1646 }
1647
1648 postcore_initcall(fiq_debugger_init);