arch/arm/mach-omap1/leds-h2p2-debug.c

   1 /*
   2  * linux/arch/arm/mach-omap1/leds-h2p2-debug.c
   3  *
   4  * Copyright 2003 by Texas Instruments Incorporated
   5  *
   6  * There are 16 LEDs on the debug board (all green); four may be used
   7  * for logical 'green', 'amber', 'red', and 'blue' (after "claiming").
   8  *
   9  * The "surfer" expansion board and H2 sample board also have two-color
  10  * green+red LEDs (in parallel), used here for timer and idle indicators.
  11  */
  12 #include <linux/gpio.h>
  13 #include <linux/init.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/sched.h>
  16 #include <linux/io.h>
  17
  18 #include <mach/hardware.h>
  19 #include <asm/leds.h>
  20 #include <asm/mach-types.h>
  21
  22 #include <plat/fpga.h>
  23
  24 #include "leds.h"
  25
  26
  27 #define GPIO_LED_RED            3
  28 #define GPIO_LED_GREEN          OMAP_MPUIO(4)
  29
  30
  31 #define LED_STATE_ENABLED       0x01
  32 #define LED_STATE_CLAIMED       0x02
  33 #define LED_TIMER_ON            0x04
  34
  35 #define GPIO_IDLE               GPIO_LED_GREEN
  36 #define GPIO_TIMER              GPIO_LED_RED
  37
  38
  39 void h2p2_dbg_leds_event(led_event_t evt)
  40 {
  41         unsigned long flags;
  42
  43         static struct h2p2_dbg_fpga __iomem *fpga;
  44         static u16 led_state, hw_led_state;
  45
  46         local_irq_save(flags);
  47
  48         if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
  49                 goto done;
  50
  51         switch (evt) {
  52         case led_start:
  53                 if (!fpga)
  54                         fpga = ioremap(H2P2_DBG_FPGA_START,
  55                                                 H2P2_DBG_FPGA_SIZE);
  56                 if (fpga) {
  57                         led_state |= LED_STATE_ENABLED;
  58                         __raw_writew(~0, &fpga->leds);
  59                 }
  60                 break;
  61
  62         case led_stop:
  63         case led_halted:
  64                 /* all leds off during suspend or shutdown */
  65
  66                 if (! machine_is_omap_perseus2()) {
  67                         gpio_set_value(GPIO_TIMER, 0);
  68                         gpio_set_value(GPIO_IDLE, 0);
  69                 }
  70
  71                 __raw_writew(~0, &fpga->leds);
  72                 led_state &= ~LED_STATE_ENABLED;
  73                 if (evt == led_halted) {
  74                         iounmap(fpga);
  75                         fpga = NULL;
  76                 }
  77
  78                 goto done;
  79
  80         case led_claim:
  81                 led_state |= LED_STATE_CLAIMED;
  82                 hw_led_state = 0;
  83                 break;
  84
  85         case led_release:
  86                 led_state &= ~LED_STATE_CLAIMED;
  87                 break;
  88
  89 #ifdef CONFIG_LEDS_TIMER
  90         case led_timer:
  91                 led_state ^= LED_TIMER_ON;
  92
  93                 if (machine_is_omap_perseus2())
  94                         hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
  95                 else {
  96                         gpio_set_value(GPIO_TIMER, led_state & LED_TIMER_ON);
  97                         goto done;
  98                 }
  99
 100                 break;
 101 #endif
 102
 103 #ifdef CONFIG_LEDS_CPU
 104         case led_idle_start:
 105                 if (machine_is_omap_perseus2())
 106                         hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
 107                 else {
 108                         gpio_set_value(GPIO_IDLE, 1);
 109                         goto done;
 110                 }
 111
 112                 break;
 113
 114         case led_idle_end:
 115                 if (machine_is_omap_perseus2())
 116                         hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
 117                 else {
 118                         gpio_set_value(GPIO_IDLE, 0);
 119                         goto done;
 120                 }
 121
 122                 break;
 123 #endif
 124
 125         case led_green_on:
 126                 hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
 127                 break;
 128         case led_green_off:
 129                 hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
 130                 break;
 131
 132         case led_amber_on:
 133                 hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
 134                 break;
 135         case led_amber_off:
 136                 hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
 137                 break;
 138
 139         case led_red_on:
 140                 hw_led_state |= H2P2_DBG_FPGA_LED_RED;
 141                 break;
 142         case led_red_off:
 143                 hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
 144                 break;
 145
 146         case led_blue_on:
 147                 hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
 148                 break;
 149         case led_blue_off:
 150                 hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
 151                 break;
 152
 153         default:
 154                 break;
 155         }
 156
 157
 158         /*
 159          *  Actually burn the LEDs
 160          */
 161         if (led_state & LED_STATE_ENABLED)
 162                 __raw_writew(~hw_led_state, &fpga->leds);
 163
 164 done:
 165         local_irq_restore(flags);
 166 }