1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/arm/mach-footbridge/ebsa285.c 4 * 5 * EBSA285 machine fixup 6 */ 7 #include <linux/init.h> 8 #include <linux/io.h> 9 #include <linux/spinlock.h> 10 #include <linux/slab.h> 11 #include <linux/leds.h> 12 13 #include <asm/hardware/dec21285.h> 14 #include <asm/mach-types.h> 15 16 #include <asm/mach/arch.h> 17 18 #include "common.h" 19 20 /* LEDs */ 21 #if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS) 22 #define XBUS_AMBER_L BIT(0) 23 #define XBUS_GREEN_L BIT(1) 24 #define XBUS_RED_L BIT(2) 25 #define XBUS_TOGGLE BIT(7) 26 27 struct ebsa285_led { 28 struct led_classdev cdev; 29 u8 mask; 30 }; 31 32 /* 33 * The triggers lines up below will only be used if the 34 * LED triggers are compiled in. 35 */ 36 static const struct { 37 const char *name; 38 const char *trigger; 39 } ebsa285_leds[] = { 40 { "ebsa285:amber", "cpu0", }, 41 { "ebsa285:green", "heartbeat", }, 42 { "ebsa285:red",}, 43 }; 44 45 static unsigned char hw_led_state; 46 static void __iomem *xbus; 47 48 static void ebsa285_led_set(struct led_classdev *cdev, 49 enum led_brightness b) 50 { 51 struct ebsa285_led *led = container_of(cdev, 52 struct ebsa285_led, cdev); 53 54 if (b == LED_OFF) 55 hw_led_state |= led->mask; 56 else 57 hw_led_state &= ~led->mask; 58 writeb(hw_led_state, xbus); 59 } 60 61 static enum led_brightness ebsa285_led_get(struct led_classdev *cdev) 62 { 63 struct ebsa285_led *led = container_of(cdev, 64 struct ebsa285_led, cdev); 65 66 return hw_led_state & led->mask ? LED_OFF : LED_FULL; 67 } 68 69 static int __init ebsa285_leds_init(void) 70 { 71 int i; 72 73 if (!machine_is_ebsa285()) 74 return -ENODEV; 75 76 xbus = ioremap(XBUS_CS2, SZ_4K); 77 if (!xbus) 78 return -ENOMEM; 79 80 /* 3 LEDS all off */ 81 hw_led_state = XBUS_AMBER_L | XBUS_GREEN_L | XBUS_RED_L; 82 writeb(hw_led_state, xbus); 83 84 for (i = 0; i < ARRAY_SIZE(ebsa285_leds); i++) { 85 struct ebsa285_led *led; 86 87 led = kzalloc(sizeof(*led), GFP_KERNEL); 88 if (!led) 89 break; 90 91 led->cdev.name = ebsa285_leds[i].name; 92 led->cdev.brightness_set = ebsa285_led_set; 93 led->cdev.brightness_get = ebsa285_led_get; 94 led->cdev.default_trigger = ebsa285_leds[i].trigger; 95 led->mask = BIT(i); 96 97 if (led_classdev_register(NULL, &led->cdev) < 0) { 98 kfree(led); 99 break; 100 } 101 } 102 103 return 0; 104 } 105 106 /* 107 * Since we may have triggers on any subsystem, defer registration 108 * until after subsystem_init. 109 */ 110 fs_initcall(ebsa285_leds_init); 111 #endif 112 113 MACHINE_START(EBSA285, "EBSA285") 114 /* Maintainer: Russell King */ 115 .atag_offset = 0x100, 116 .video_start = 0x000a0000, 117 .video_end = 0x000bffff, 118 .map_io = footbridge_map_io, 119 .init_early = footbridge_sched_clock, 120 .init_irq = footbridge_init_irq, 121 .init_time = footbridge_timer_init, 122 .restart = footbridge_restart, 123 MACHINE_END 124 125