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
26struct 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 */
35static 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
44static unsigned char hw_led_state;
45static void __iomem *xbus;
46
47static 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
60static 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
68static 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 */
109fs_initcall(ebsa285_leds_init);
110#endif
111
112MACHINE_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,
122MACHINE_END
123
124