Logo Search packages:      
Sourcecode: linux version File versions  Download package

leds-h2p2-debug.c

/*
 * linux/arch/arm/mach-omap1/leds-h2p2-debug.c
 *
 * Copyright 2003 by Texas Instruments Incorporated
 *
 * There are 16 LEDs on the debug board (all green); four may be used
 * for logical 'green', 'amber', 'red', and 'blue' (after "claiming").
 *
 * The "surfer" expansion board and H2 sample board also have two-color
 * green+red LEDs (in parallel), used here for timer and idle indicators.
 */
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/sched.h>
#include <linux/io.h>

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

#include <plat/fpga.h>
#include <mach/gpio.h>

#include "leds.h"


#define GPIO_LED_RED          3
#define GPIO_LED_GREEN        OMAP_MPUIO(4)


#define LED_STATE_ENABLED     0x01
#define LED_STATE_CLAIMED     0x02
#define LED_TIMER_ON          0x04

#define GPIO_IDLE       GPIO_LED_GREEN
#define GPIO_TIMER            GPIO_LED_RED


void h2p2_dbg_leds_event(led_event_t evt)
{
      unsigned long flags;

      static struct h2p2_dbg_fpga __iomem *fpga;
      static u16 led_state, hw_led_state;

      local_irq_save(flags);

      if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
            goto done;

      switch (evt) {
      case led_start:
            if (!fpga)
                  fpga = ioremap(H2P2_DBG_FPGA_START,
                                    H2P2_DBG_FPGA_SIZE);
            if (fpga) {
                  led_state |= LED_STATE_ENABLED;
                  __raw_writew(~0, &fpga->leds);
            }
            break;

      case led_stop:
      case led_halted:
            /* all leds off during suspend or shutdown */

            if (! machine_is_omap_perseus2()) {
                  gpio_set_value(GPIO_TIMER, 0);
                  gpio_set_value(GPIO_IDLE, 0);
            }

            __raw_writew(~0, &fpga->leds);
            led_state &= ~LED_STATE_ENABLED;
            if (evt == led_halted) {
                  iounmap(fpga);
                  fpga = NULL;
            }

            goto done;

      case led_claim:
            led_state |= LED_STATE_CLAIMED;
            hw_led_state = 0;
            break;

      case led_release:
            led_state &= ~LED_STATE_CLAIMED;
            break;

#ifdef CONFIG_LEDS_TIMER
      case led_timer:
            led_state ^= LED_TIMER_ON;

            if (machine_is_omap_perseus2())
                  hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
            else {
                  gpio_set_value(GPIO_TIMER, led_state & LED_TIMER_ON);
                  goto done;
            }

            break;
#endif

#ifdef CONFIG_LEDS_CPU
      case led_idle_start:
            if (machine_is_omap_perseus2())
                  hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
            else {
                  gpio_set_value(GPIO_IDLE, 1);
                  goto done;
            }

            break;

      case led_idle_end:
            if (machine_is_omap_perseus2())
                  hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
            else {
                  gpio_set_value(GPIO_IDLE, 0);
                  goto done;
            }

            break;
#endif

      case led_green_on:
            hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
            break;
      case led_green_off:
            hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
            break;

      case led_amber_on:
            hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
            break;
      case led_amber_off:
            hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
            break;

      case led_red_on:
            hw_led_state |= H2P2_DBG_FPGA_LED_RED;
            break;
      case led_red_off:
            hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
            break;

      case led_blue_on:
            hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
            break;
      case led_blue_off:
            hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
            break;

      default:
            break;
      }


      /*
       *  Actually burn the LEDs
       */
      if (led_state & LED_STATE_ENABLED)
            __raw_writew(~hw_led_state, &fpga->leds);

done:
      local_irq_restore(flags);
}

Generated by  Doxygen 1.6.0   Back to index