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