arch/arm/mach-footbridge/ebsa285.c

   1 /*
   2  * linux/arch/arm/mach-footbridge/ebsa285.c
   3  *
   4  * EBSA285 machine fixup
   5  */
   6 #include <linux/init.h>
   7 #include <linux/io.h>
   8 #include <linux/spinlock.h>
   9 #include <linux/slab.h>
  10 #include <linux/leds.h>
  11
  12 #include <asm/hardware/dec21285.h>
  13 #include <asm/mach-types.h>
  14
  15 #include <asm/mach/arch.h>
  16
  17 #include "common.h"
  18
  19 /* LEDs */
  20 #if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
  21 #define XBUS_AMBER_L    BIT(0)
  22 #define XBUS_GREEN_L    BIT(1)
  23 #define XBUS_RED_L      BIT(2)
  24 #define XBUS_TOGGLE     BIT(7)
  25
  26 struct ebsa285_led {
  27         struct led_classdev     cdev;
  28         u8                      mask;
  29 };
  30
  31 /*
  32  * The triggers lines up below will only be used if the
  33  * LED triggers are compiled in.
  34  */
  35 static const struct {
  36         const char *name;
  37         const char *trigger;
  38 } ebsa285_leds[] = {
  39         { "ebsa285:amber", "cpu0", },
  40         { "ebsa285:green", "heartbeat", },
  41         { "ebsa285:red",},
  42 };
  43
  44 static unsigned char hw_led_state;
  45 static void __iomem *xbus;
  46
  47 static void ebsa285_led_set(struct led_classdev *cdev,
  48                 enum led_brightness b)
  49 {
  50         struct ebsa285_led *led = container_of(cdev,
  51                         struct ebsa285_led, cdev);
  52
  53         if (b == LED_OFF)
  54                 hw_led_state |= led->mask;
  55         else
  56                 hw_led_state &= ~led->mask;
  57         writeb(hw_led_state, xbus);
  58 }
  59
  60 static enum led_brightness ebsa285_led_get(struct led_classdev *cdev)
  61 {
  62         struct ebsa285_led *led = container_of(cdev,
  63                         struct ebsa285_led, cdev);
  64
  65         return hw_led_state & led->mask ? LED_OFF : LED_FULL;
  66 }
  67
  68 static int __init ebsa285_leds_init(void)
  69 {
  70         int i;
  71
  72         if (!machine_is_ebsa285())
  73                 return -ENODEV;
  74
  75         xbus = ioremap(XBUS_CS2, SZ_4K);
  76         if (!xbus)
  77                 return -ENOMEM;
  78
  79         /* 3 LEDS all off */
  80         hw_led_state = XBUS_AMBER_L | XBUS_GREEN_L | XBUS_RED_L;
  81         writeb(hw_led_state, xbus);
  82
  83         for (i = 0; i < ARRAY_SIZE(ebsa285_leds); i++) {
  84                 struct ebsa285_led *led;
  85
  86                 led = kzalloc(sizeof(*led), GFP_KERNEL);
  87                 if (!led)
  88                         break;
  89
  90                 led->cdev.name = ebsa285_leds[i].name;
  91                 led->cdev.brightness_set = ebsa285_led_set;
  92                 led->cdev.brightness_get = ebsa285_led_get;
  93                 led->cdev.default_trigger = ebsa285_leds[i].trigger;
  94                 led->mask = BIT(i);
  95
  96                 if (led_classdev_register(NULL, &led->cdev) < 0) {
  97                         kfree(led);
  98                         break;
  99                 }
 100         }
 101
 102         return 0;
 103 }
 104
 105 /*
 106  * Since we may have triggers on any subsystem, defer registration
 107  * until after subsystem_init.
 108  */
 109 fs_initcall(ebsa285_leds_init);
 110 #endif
 111
 112 MACHINE_START(EBSA285, "EBSA285")
 113         /* Maintainer: Russell King */
 114         .atag_offset    = 0x100,
 115         .video_start    = 0x000a0000,
 116         .video_end      = 0x000bffff,
 117         .map_io         = footbridge_map_io,
 118         .init_early     = footbridge_sched_clock,
 119         .init_irq       = footbridge_init_irq,
 120         .init_time      = footbridge_timer_init,
 121         .restart        = footbridge_restart,
 122 MACHINE_END
 123