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Linux/arch/arm/mach-footbridge/ebsa285.c

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  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 

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