125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/arm/mach-footbridge/ebsa285.c
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*
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* EBSA285 machine fixup
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <asm/hardware/dec21285.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include "common.h"
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/* LEDs */
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#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
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#define XBUS_AMBER_L BIT(0)
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#define XBUS_GREEN_L BIT(1)
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#define XBUS_RED_L BIT(2)
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#define XBUS_TOGGLE BIT(7)
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struct ebsa285_led {
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struct led_classdev cdev;
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u8 mask;
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};
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/*
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* The triggers lines up below will only be used if the
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* LED triggers are compiled in.
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*/
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static const struct {
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const char *name;
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const char *trigger;
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} ebsa285_leds[] = {
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{ "ebsa285:amber", "cpu0", },
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{ "ebsa285:green", "heartbeat", },
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{ "ebsa285:red",},
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};
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static unsigned char hw_led_state;
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static void __iomem *xbus;
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static void ebsa285_led_set(struct led_classdev *cdev,
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enum led_brightness b)
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{
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struct ebsa285_led *led = container_of(cdev,
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struct ebsa285_led, cdev);
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if (b == LED_OFF)
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hw_led_state |= led->mask;
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else
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hw_led_state &= ~led->mask;
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writeb(hw_led_state, xbus);
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}
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static enum led_brightness ebsa285_led_get(struct led_classdev *cdev)
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{
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struct ebsa285_led *led = container_of(cdev,
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struct ebsa285_led, cdev);
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return hw_led_state & led->mask ? LED_OFF : LED_FULL;
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}
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static int __init ebsa285_leds_init(void)
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{
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int i;
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if (!machine_is_ebsa285())
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return -ENODEV;
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xbus = ioremap(XBUS_CS2, SZ_4K);
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if (!xbus)
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return -ENOMEM;
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/* 3 LEDS all off */
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hw_led_state = XBUS_AMBER_L | XBUS_GREEN_L | XBUS_RED_L;
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writeb(hw_led_state, xbus);
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for (i = 0; i < ARRAY_SIZE(ebsa285_leds); i++) {
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struct ebsa285_led *led;
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led = kzalloc(sizeof(*led), GFP_KERNEL);
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if (!led)
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break;
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led->cdev.name = ebsa285_leds[i].name;
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led->cdev.brightness_set = ebsa285_led_set;
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led->cdev.brightness_get = ebsa285_led_get;
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led->cdev.default_trigger = ebsa285_leds[i].trigger;
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led->mask = BIT(i);
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if (led_classdev_register(NULL, &led->cdev) < 0) {
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kfree(led);
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break;
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}
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}
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return 0;
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}
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/*
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* Since we may have triggers on any subsystem, defer registration
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* until after subsystem_init.
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*/
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fs_initcall(ebsa285_leds_init);
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#endif
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MACHINE_START(EBSA285, "EBSA285")
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/* Maintainer: Russell King */
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.atag_offset = 0x100,
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.video_start = 0x000a0000,
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.video_end = 0x000bffff,
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.map_io = footbridge_map_io,
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.init_early = footbridge_sched_clock,
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.init_irq = footbridge_init_irq,
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.init_time = footbridge_timer_init,
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.restart = footbridge_restart,
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MACHINE_END
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