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
27struct 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 */
36static 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
45static unsigned char hw_led_state;
46static void __iomem *xbus;
47
48static 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
61static 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
69static 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 */
110fs_initcall(ebsa285_leds_init);
111#endif
112
113MACHINE_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,
123MACHINE_END
124
125