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 123 124