release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-integrator/leds.c

   1 /*
   2  *  linux/arch/arm/mach-integrator/leds.c
   3  *
   4  *  Integrator/AP and Integrator/CP LED control routines
   5  *
   6  *  Copyright (C) 1999 ARM Limited
   7  *  Copyright (C) 2000 Deep Blue Solutions Ltd
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/smp.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/io.h>
  28
  29 #include <mach/hardware.h>
  30 #include <mach/platform.h>
  31 #include <asm/leds.h>
  32 #include <asm/system.h>
  33 #include <asm/mach-types.h>
  34 #include <mach/cm.h>
  35
  36 static int saved_leds;
  37
  38 static void integrator_leds_event(led_event_t ledevt)
  39 {
  40         unsigned long flags;
  41         const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);
  42         unsigned int update_alpha_leds;
  43
  44         // yup, change the LEDs
  45         local_irq_save(flags);
  46         update_alpha_leds = 0;
  47
  48         switch(ledevt) {
  49         case led_idle_start:
  50                 cm_control(CM_CTRL_LED, 0);
  51                 break;
  52
  53         case led_idle_end:
  54                 cm_control(CM_CTRL_LED, CM_CTRL_LED);
  55                 break;
  56
  57         case led_timer:
  58                 saved_leds ^= GREEN_LED;
  59                 update_alpha_leds = 1;
  60                 break;
  61
  62         case led_red_on:
  63                 saved_leds |= RED_LED;
  64                 update_alpha_leds = 1;
  65                 break;
  66
  67         case led_red_off:
  68                 saved_leds &= ~RED_LED;
  69                 update_alpha_leds = 1;
  70                 break;
  71
  72         default:
  73                 break;
  74         }
  75
  76         if (update_alpha_leds) {
  77                 while (__raw_readl(dbg_base + INTEGRATOR_DBG_ALPHA_OFFSET) & 1);
  78                 __raw_writel(saved_leds, dbg_base + INTEGRATOR_DBG_LEDS_OFFSET);
  79         }
  80         local_irq_restore(flags);
  81 }
  82
  83 static int __init leds_init(void)
  84 {
  85         if (machine_is_integrator() || machine_is_cintegrator())
  86                 leds_event = integrator_leds_event;
  87
  88         return 0;
  89 }
  90
  91 core_initcall(leds_init);