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
ebsa285_led_set(struct led_classdev * cdev,enum led_brightness b)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
ebsa285_led_get(struct led_classdev * cdev)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
ebsa285_leds_init(void)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