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leds.c

/*
 *  linux/arch/arm/mach-integrator/leds.c
 *
 *  Integrator/AP and Integrator/CP LED control routines
 *
 *  Copyright (C) 1999 ARM Limited
 *  Copyright (C) 2000 Deep Blue Solutions Ltd
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/spinlock.h>

#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/leds.h>
#include <asm/system.h>
#include <asm/mach-types.h>
#include <mach/cm.h>

static int saved_leds;

static void integrator_leds_event(led_event_t ledevt)
{
      unsigned long flags;
      const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);
      unsigned int update_alpha_leds;

      // yup, change the LEDs
      local_irq_save(flags);
      update_alpha_leds = 0;

      switch(ledevt) {
      case led_idle_start:
            cm_control(CM_CTRL_LED, 0);
            break;

      case led_idle_end:
            cm_control(CM_CTRL_LED, CM_CTRL_LED);
            break;

      case led_timer:
            saved_leds ^= GREEN_LED;
            update_alpha_leds = 1;
            break;

      case led_red_on:
            saved_leds |= RED_LED;
            update_alpha_leds = 1;
            break;

      case led_red_off:
            saved_leds &= ~RED_LED;
            update_alpha_leds = 1;
            break;

      default:
            break;
      }

      if (update_alpha_leds) {
            while (__raw_readl(dbg_base + INTEGRATOR_DBG_ALPHA_OFFSET) & 1);
            __raw_writel(saved_leds, dbg_base + INTEGRATOR_DBG_LEDS_OFFSET);
      }
      local_irq_restore(flags);
}

static int __init leds_init(void)
{
      if (machine_is_integrator() || machine_is_cintegrator())
            leds_event = integrator_leds_event;

      return 0;
}

core_initcall(leds_init);

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