target/linux/s3c24xx/patches-2.6.24/1208-introduce-panic-blink-led-not-using-userspace-omfg.p.patch

   1 From 0e049b8ff8ad37e3749121519fe96d357e0754f4 Mon Sep 17 00:00:00 2001
   2 From: Andy Green <andy@openmoko.com>
   3 Date: Wed, 2 Jul 2008 22:43:20 +0100
   4 Subject: [PATCH] introduce-panic-blink-led-not-using-userspace-omfg.patch
   5
   6 A panic is silent on GTA02, it would be good if we got a little hint
   7 if we are crashing (eg, in suspend / resume) from a panic instead of
   8 a deadlock, etc.  On a normal PC i8042 blinks the keyboard lights if
   9 we panic, this patch causes AUX to flash at 5Hz in event of a panic.
  10
  11 Tested by giving kernel fake root= that didn't exist.
  12
  13 Signed-off-by: Andy Green <andy@openmoko.com>
  14 ---
  15  arch/arm/mach-s3c2440/mach-gta02.c |   24 ++++++++++++++++++++++++
  16  1 files changed, 24 insertions(+), 0 deletions(-)
  17
  18 diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
  19 index fd746fd..c32bb2a 100644
  20 --- a/arch/arm/mach-s3c2440/mach-gta02.c
  21 +++ b/arch/arm/mach-s3c2440/mach-gta02.c
  22 @@ -328,6 +328,27 @@ FIQ_HANDLER_ENTRY(256, 512)
  23  FIQ_HANDLER_END()
  24
  25
  26 +/*
  27 + * this gets called every 1ms when we paniced.
  28 + */
  29 +
  30 +static long gta02_panic_blink(long count)
  31 +{
  32 +       long delay = 0;
  33 +       static long last_blink;
  34 +       static char led;
  35 +
  36 +       if (count - last_blink < 100) /* 200ms period, fast blink */
  37 +               return 0;
  38 +
  39 +       led ^= 1;
  40 +       s3c2410_gpio_cfgpin(GTA02_GPIO_AUX_LED, S3C2410_GPIO_OUTPUT);
  41 +       neo1973_gpb_setpin(GTA02_GPIO_AUX_LED, led);
  42 +
  43 +       last_blink = count;
  44 +       return delay;
  45 +}
  46 +
  47
  48  /**
  49   * returns PCB revision information in b9,b8 and b2,b1,b0
  50 @@ -1476,6 +1497,9 @@ static void __init gta02_machine_init(void)
  51  {
  52         int rc;
  53
  54 +       /* set the panic callback to make AUX blink fast */
  55 +       panic_blink = gta02_panic_blink;
  56 +
  57         switch (system_rev) {
  58         case GTA02v6_SYSTEM_REV:
  59                 /* we need push-pull interrupt from motion sensors */
  60 --
  61 1.5.6.5
  62