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
  26 #include <asm/hardware.h>
  27 #include <asm/io.h>
  28 #include <asm/leds.h>
  29 #include <asm/system.h>
  30 #include <asm/mach-types.h>
  31 #include <asm/arch/cm.h>
  32
  33 static int saved_leds;
  34
  35 static void integrator_leds_event(led_event_t ledevt)
  36 {
  37         unsigned long flags;
  38         const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);
  39         unsigned int update_alpha_leds;
  40
  41         // yup, change the LEDs
  42         local_irq_save(flags);
  43         update_alpha_leds = 0;
  44
  45         switch(ledevt) {
  46         case led_idle_start:
  47                 cm_control(CM_CTRL_LED, 0);
  48                 break;
  49
  50         case led_idle_end:
  51                 cm_control(CM_CTRL_LED, CM_CTRL_LED);
  52                 break;
  53
  54         case led_timer:
  55                 saved_leds ^= GREEN_LED;
  56                 update_alpha_leds = 1;
  57                 break;
  58
  59         case led_red_on:
  60                 saved_leds |= RED_LED;
  61                 update_alpha_leds = 1;
  62                 break;
  63
  64         case led_red_off:
  65                 saved_leds &= ~RED_LED;
  66                 update_alpha_leds = 1;
  67                 break;
  68
  69         default:
  70                 break;
  71         }
  72
  73         if (update_alpha_leds) {
  74                 while (__raw_readl(dbg_base + INTEGRATOR_DBG_ALPHA_OFFSET) & 1);
  75                 __raw_writel(saved_leds, dbg_base + INTEGRATOR_DBG_LEDS_OFFSET);
  76         }
  77         local_irq_restore(flags);
  78 }
  79
  80 static int __init leds_init(void)
  81 {
  82         if (machine_is_integrator() || machine_is_cintegrator())
  83                 leds_event = integrator_leds_event;
  84
  85         return 0;
  86 }
  87
  88 __initcall(leds_init);