ebsa285.c

  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