// SPDX-License-Identifier: GPL-2.0
/*
 * linux/arch/arm/mach-footbridge/ebsa285.c
 *
 * EBSA285 machine fixup
 */
#include <linux/init.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/leds.h>

#include <asm/hardware/dec21285.h>
#include <asm/mach-types.h>

#include <asm/mach/arch.h>

#include "common.h"

/* LEDs */
#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
#define XBUS_AMBER_L    BIT(0)
#define XBUS_GREEN_L    BIT(1)
#define XBUS_RED_L      BIT(2)
#define XBUS_TOGGLE     BIT(7)

struct ebsa285_led {
        struct led_classdev     cdev;
        u8                      mask;
};

/*
 * The triggers lines up below will only be used if the
 * LED triggers are compiled in.
 */
static const struct {
        const char *name;
        const char *trigger;
} ebsa285_leds[] = {
        { "ebsa285:amber", "cpu0", },
        { "ebsa285:green", "heartbeat", },
        { "ebsa285:red",},
};

static unsigned char hw_led_state;
static void __iomem *xbus;

static void ebsa285_led_set(struct led_classdev *cdev,
                enum led_brightness b)
{
        struct ebsa285_led *led = container_of(cdev,
                        struct ebsa285_led, cdev);

        if (b == LED_OFF)
                hw_led_state |= led->mask;
        else
                hw_led_state &= ~led->mask;
        writeb(hw_led_state, xbus);
}

static enum led_brightness ebsa285_led_get(struct led_classdev *cdev)
{
        struct ebsa285_led *led = container_of(cdev,
                        struct ebsa285_led, cdev);

        return hw_led_state & led->mask ? LED_OFF : LED_FULL;
}

static int __init ebsa285_leds_init(void)
{
        int i;

        if (!machine_is_ebsa285())
                return -ENODEV;

        xbus = ioremap(XBUS_CS2, SZ_4K);
        if (!xbus)
                return -ENOMEM;

        /* 3 LEDS all off */
        hw_led_state = XBUS_AMBER_L | XBUS_GREEN_L | XBUS_RED_L;
        writeb(hw_led_state, xbus);

        for (i = 0; i < ARRAY_SIZE(ebsa285_leds); i++) {
                struct ebsa285_led *led;

                led = kzalloc_obj(*led);
                if (!led)
                        break;

                led->cdev.name = ebsa285_leds[i].name;
                led->cdev.brightness_set = ebsa285_led_set;
                led->cdev.brightness_get = ebsa285_led_get;
                led->cdev.default_trigger = ebsa285_leds[i].trigger;
                led->mask = BIT(i);

                if (led_classdev_register(NULL, &led->cdev) < 0) {
                        kfree(led);
                        break;
                }
        }

        return 0;
}

/*
 * Since we may have triggers on any subsystem, defer registration
 * until after subsystem_init.
 */
fs_initcall(ebsa285_leds_init);
#endif

MACHINE_START(EBSA285, "EBSA285")
        /* Maintainer: Russell King */
        .atag_offset    = 0x100,
        .video_start    = 0x000a0000,
        .video_end      = 0x000bffff,
        .map_io         = footbridge_map_io,
        .init_early     = footbridge_sched_clock,
        .init_irq       = footbridge_init_irq,
        .init_time      = footbridge_timer_init,
        .restart        = footbridge_restart,
MACHINE_END