[deliverable/linux.git] / arch / arm / plat-omap / debug-leds.c

/*
 * linux/arch/arm/plat-omap/debug-leds.c
 *
 * Copyright 2003 by Texas Instruments Incorporated
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/io.h>
#include <linux/platform_data/gpio-omap.h>

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

#include <plat/fpga.h>


/* Many OMAP development platforms reuse the same "debug board"; these
 * platforms include H2, H3, H4, and Perseus2.  There are 16 LEDs on the
 * debug board (all green), accessed through FPGA registers.
 *
 * The "surfer" expansion board and H2 sample board also have two-color
 * green+red LEDs (in parallel), used here for timer and idle indicators
 * in preference to the ones on the debug board, for a "Disco LED" effect.
 *
 * This driver exports either the original ARM LED API, the new generic
 * one, or both.
 */

static spinlock_t			lock;
static struct h2p2_dbg_fpga __iomem	*fpga;
static u16				led_state, hw_led_state;


#ifdef	CONFIG_OMAP_DEBUG_LEDS
#define new_led_api()	1
#else
#define new_led_api()	0
#endif


/*-------------------------------------------------------------------------*/

/* original ARM debug LED API:
 *  - timer and idle leds (some boards use non-FPGA leds here);
 *  - up to 4 generic leds, easily accessed in-kernel (any context)
 */

#define GPIO_LED_RED		3
#define GPIO_LED_GREEN		OMAP_MPUIO(4)

#define LED_STATE_ENABLED	0x01
#define LED_STATE_CLAIMED	0x02
#define LED_TIMER_ON		0x04

#define GPIO_IDLE		GPIO_LED_GREEN
#define GPIO_TIMER		GPIO_LED_RED

static void h2p2_dbg_leds_event(led_event_t evt)
{
	unsigned long flags;

	spin_lock_irqsave(&lock, flags);

	if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
		goto done;

	switch (evt) {
	case led_start:
		if (fpga)
			led_state |= LED_STATE_ENABLED;
		break;

	case led_stop:
	case led_halted:
		/* all leds off during suspend or shutdown */

		if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) {
			gpio_set_value(GPIO_TIMER, 0);
			gpio_set_value(GPIO_IDLE, 0);
		}

		__raw_writew(~0, &fpga->leds);
		led_state &= ~LED_STATE_ENABLED;
		goto done;

	case led_claim:
		led_state |= LED_STATE_CLAIMED;
		hw_led_state = 0;
		break;

	case led_release:
		led_state &= ~LED_STATE_CLAIMED;
		break;

#ifdef CONFIG_LEDS_TIMER
	case led_timer:
		led_state ^= LED_TIMER_ON;

		if (machine_is_omap_perseus2() || machine_is_omap_h4())
			hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
		else {
			gpio_set_value(GPIO_TIMER,
					led_state & LED_TIMER_ON);
			goto done;
		}

		break;
#endif

#ifdef CONFIG_LEDS_CPU
	/* LED lit iff busy */
	case led_idle_start:
		if (machine_is_omap_perseus2() || machine_is_omap_h4())
			hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
		else {
			gpio_set_value(GPIO_IDLE, 1);
			goto done;
		}

		break;

	case led_idle_end:
		if (machine_is_omap_perseus2() || machine_is_omap_h4())
			hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
		else {
			gpio_set_value(GPIO_IDLE, 0);
			goto done;
		}

		break;
#endif

	case led_green_on:
		hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
		break;
	case led_green_off:
		hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
		break;

	case led_amber_on:
		hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
		break;
	case led_amber_off:
		hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
		break;

	case led_red_on:
		hw_led_state |= H2P2_DBG_FPGA_LED_RED;
		break;
	case led_red_off:
		hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
		break;

	case led_blue_on:
		hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
		break;
	case led_blue_off:
		hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
		break;

	default:
		break;
	}


	/*
	 *  Actually burn the LEDs
	 */
	if (led_state & LED_STATE_ENABLED)
		__raw_writew(~hw_led_state, &fpga->leds);

done:
	spin_unlock_irqrestore(&lock, flags);
}

/*-------------------------------------------------------------------------*/

/* "new" LED API
 *  - with syfs access and generic triggering
 *  - not readily accessible to in-kernel drivers
 */

struct dbg_led {
	struct led_classdev	cdev;
	u16			mask;
};

static struct dbg_led dbg_leds[] = {
	/* REVISIT at least H2 uses different timer & cpu leds... */
#ifndef CONFIG_LEDS_TIMER
	{ .mask = 1 << 0,  .cdev.name =  "d4:green",
		.cdev.default_trigger = "heartbeat", },
#endif
#ifndef CONFIG_LEDS_CPU
	{ .mask = 1 << 1,  .cdev.name =  "d5:green", },		/* !idle */
#endif
	{ .mask = 1 << 2,  .cdev.name =  "d6:green", },
	{ .mask = 1 << 3,  .cdev.name =  "d7:green", },

	{ .mask = 1 << 4,  .cdev.name =  "d8:green", },
	{ .mask = 1 << 5,  .cdev.name =  "d9:green", },
	{ .mask = 1 << 6,  .cdev.name = "d10:green", },
	{ .mask = 1 << 7,  .cdev.name = "d11:green", },

	{ .mask = 1 << 8,  .cdev.name = "d12:green", },
	{ .mask = 1 << 9,  .cdev.name = "d13:green", },
	{ .mask = 1 << 10, .cdev.name = "d14:green", },
	{ .mask = 1 << 11, .cdev.name = "d15:green", },

#ifndef	CONFIG_LEDS
	{ .mask = 1 << 12, .cdev.name = "d16:green", },
	{ .mask = 1 << 13, .cdev.name = "d17:green", },
	{ .mask = 1 << 14, .cdev.name = "d18:green", },
	{ .mask = 1 << 15, .cdev.name = "d19:green", },
#endif
};

static void
fpga_led_set(struct led_classdev *cdev, enum led_brightness value)
{
	struct dbg_led	*led = container_of(cdev, struct dbg_led, cdev);
	unsigned long	flags;

	spin_lock_irqsave(&lock, flags);
	if (value == LED_OFF)
		hw_led_state &= ~led->mask;
	else
		hw_led_state |= led->mask;
	__raw_writew(~hw_led_state, &fpga->leds);
	spin_unlock_irqrestore(&lock, flags);
}

static void __init newled_init(struct device *dev)
{
	unsigned	i;
	struct dbg_led	*led;
	int		status;

	for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) {
		led->cdev.brightness_set = fpga_led_set;
		status = led_classdev_register(dev, &led->cdev);
		if (status < 0)
			break;
	}
	return;
}


/*-------------------------------------------------------------------------*/

static int /* __init */ fpga_probe(struct platform_device *pdev)
{
	struct resource	*iomem;

	spin_lock_init(&lock);

	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iomem)
		return -ENODEV;

	fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
	__raw_writew(~0, &fpga->leds);

#ifdef	CONFIG_LEDS
	leds_event = h2p2_dbg_leds_event;
	leds_event(led_start);
#endif

	if (new_led_api()) {
		newled_init(&pdev->dev);
	}

	return 0;
}

static int fpga_suspend_noirq(struct device *dev)
{
	__raw_writew(~0, &fpga->leds);
	return 0;
}

static int fpga_resume_noirq(struct device *dev)
{
	__raw_writew(~hw_led_state, &fpga->leds);
	return 0;
}

static const struct dev_pm_ops fpga_dev_pm_ops = {
	.suspend_noirq = fpga_suspend_noirq,
	.resume_noirq = fpga_resume_noirq,
};

static struct platform_driver led_driver = {
	.driver.name	= "omap_dbg_led",
	.driver.pm	= &fpga_dev_pm_ops,
	.probe		= fpga_probe,
};

static int __init fpga_init(void)
{
	if (machine_is_omap_h4()
			|| machine_is_omap_h3()
			|| machine_is_omap_h2()
			|| machine_is_omap_perseus2()
			)
		return platform_driver_register(&led_driver);
	return 0;
}
fs_initcall(fpga_init);
Commit	Line	Data
994c84ea DB	1	/*
	2	* linux/arch/arm/plat-omap/debug-leds.c
	3	*
	4	* Copyright 2003 by Texas Instruments Incorporated
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
2f8163ba	10	#include <linux/gpio.h>
994c84ea DB	11	#include <linux/init.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/leds.h>
fced80c7	14	#include <linux/io.h>
4b25408f	15	#include <linux/platform_data/gpio-omap.h>
994c84ea	16
a09e64fb	17	#include <mach/hardware.h>
994c84ea	18	#include <asm/leds.h>
994c84ea DB	19	#include <asm/mach-types.h>
994c84ea DB	20
ce491cf8	21	#include <plat/fpga.h>
994c84ea DB	22
	23
	24	/* Many OMAP development platforms reuse the same "debug board"; these
	25	* platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the
	26	* debug board (all green), accessed through FPGA registers.
	27	*
	28	* The "surfer" expansion board and H2 sample board also have two-color
	29	* green+red LEDs (in parallel), used here for timer and idle indicators
	30	* in preference to the ones on the debug board, for a "Disco LED" effect.
	31	*
	32	* This driver exports either the original ARM LED API, the new generic
	33	* one, or both.
	34	*/
	35
	36	static spinlock_t lock;
	37	static struct h2p2_dbg_fpga __iomem *fpga;
	38	static u16 led_state, hw_led_state;
	39
	40
3c8ed2a9	41	#ifdef CONFIG_OMAP_DEBUG_LEDS
994c84ea DB	42	#define new_led_api() 1
	43	#else
	44	#define new_led_api() 0
	45	#endif
	46
	47
	48	/-------------------------------------------------------------------------/
	49
	50	/* original ARM debug LED API:
	51	* - timer and idle leds (some boards use non-FPGA leds here);
	52	* - up to 4 generic leds, easily accessed in-kernel (any context)
	53	*/
	54
	55	#define GPIO_LED_RED 3
	56	#define GPIO_LED_GREEN OMAP_MPUIO(4)
	57
	58	#define LED_STATE_ENABLED 0x01
	59	#define LED_STATE_CLAIMED 0x02
	60	#define LED_TIMER_ON 0x04
	61
	62	#define GPIO_IDLE GPIO_LED_GREEN
	63	#define GPIO_TIMER GPIO_LED_RED
	64
	65	static void h2p2_dbg_leds_event(led_event_t evt)
	66	{
	67	unsigned long flags;
	68
	69	spin_lock_irqsave(&lock, flags);
	70
	71	if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
	72	goto done;
	73
	74	switch (evt) {
	75	case led_start:
	76	if (fpga)
	77	led_state \|= LED_STATE_ENABLED;
	78	break;
	79
	80	case led_stop:
	81	case led_halted:
	82	/* all leds off during suspend or shutdown */
	83
	84	if (!(machine_is_omap_perseus2() \|\| machine_is_omap_h4())) {
0b84b5ca DB	85	gpio_set_value(GPIO_TIMER, 0);
0b84b5ca DB	86	gpio_set_value(GPIO_IDLE, 0);
994c84ea DB	87	}
	88
	89	__raw_writew(~0, &fpga->leds);
	90	led_state &= ~LED_STATE_ENABLED;
	91	goto done;
	92
	93	case led_claim:
	94	led_state \|= LED_STATE_CLAIMED;
	95	hw_led_state = 0;
	96	break;
	97
	98	case led_release:
	99	led_state &= ~LED_STATE_CLAIMED;
	100	break;
	101
	102	#ifdef CONFIG_LEDS_TIMER
	103	case led_timer:
	104	led_state ^= LED_TIMER_ON;
	105
	106	if (machine_is_omap_perseus2() \|\| machine_is_omap_h4())
	107	hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
	108	else {
0b84b5ca	109	gpio_set_value(GPIO_TIMER,
994c84ea DB	110	led_state & LED_TIMER_ON);
	111	goto done;
	112	}
	113
	114	break;
	115	#endif
	116
	117	#ifdef CONFIG_LEDS_CPU
	118	/* LED lit iff busy */
	119	case led_idle_start:
	120	if (machine_is_omap_perseus2() \|\| machine_is_omap_h4())
	121	hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
	122	else {
0b84b5ca	123	gpio_set_value(GPIO_IDLE, 1);
994c84ea DB	124	goto done;
	125	}
	126
	127	break;
	128
	129	case led_idle_end:
	130	if (machine_is_omap_perseus2() \|\| machine_is_omap_h4())
	131	hw_led_state \|= H2P2_DBG_FPGA_P2_LED_IDLE;
	132	else {
0b84b5ca	133	gpio_set_value(GPIO_IDLE, 0);
994c84ea DB	134	goto done;
	135	}
	136
	137	break;
	138	#endif
	139
	140	case led_green_on:
	141	hw_led_state \|= H2P2_DBG_FPGA_LED_GREEN;
	142	break;
	143	case led_green_off:
	144	hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
	145	break;
	146
	147	case led_amber_on:
	148	hw_led_state \|= H2P2_DBG_FPGA_LED_AMBER;
	149	break;
	150	case led_amber_off:
	151	hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
	152	break;
	153
	154	case led_red_on:
	155	hw_led_state \|= H2P2_DBG_FPGA_LED_RED;
	156	break;
	157	case led_red_off:
	158	hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
	159	break;
	160
	161	case led_blue_on:
	162	hw_led_state \|= H2P2_DBG_FPGA_LED_BLUE;
	163	break;
	164	case led_blue_off:
	165	hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
	166	break;
	167
	168	default:
	169	break;
	170	}
	171
	172
	173	/*
	174	* Actually burn the LEDs
	175	*/
	176	if (led_state & LED_STATE_ENABLED)
	177	__raw_writew(~hw_led_state, &fpga->leds);
	178
	179	done:
	180	spin_unlock_irqrestore(&lock, flags);
	181	}
	182
	183	/-------------------------------------------------------------------------/
	184
	185	/* "new" LED API
	186	* - with syfs access and generic triggering
	187	* - not readily accessible to in-kernel drivers
	188	*/
	189
	190	struct dbg_led {
	191	struct led_classdev cdev;
	192	u16 mask;
	193	};
	194
	195	static struct dbg_led dbg_leds[] = {
	196	/* REVISIT at least H2 uses different timer & cpu leds... */
	197	#ifndef CONFIG_LEDS_TIMER
e0b50d3c DB	198	{ .mask = 1 << 0, .cdev.name = "d4:green",
e0b50d3c DB	199	.cdev.default_trigger = "heartbeat", },
994c84ea DB	200	#endif
	201	#ifndef CONFIG_LEDS_CPU
	202	{ .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */
	203	#endif
	204	{ .mask = 1 << 2, .cdev.name = "d6:green", },
	205	{ .mask = 1 << 3, .cdev.name = "d7:green", },
	206
	207	{ .mask = 1 << 4, .cdev.name = "d8:green", },
	208	{ .mask = 1 << 5, .cdev.name = "d9:green", },
	209	{ .mask = 1 << 6, .cdev.name = "d10:green", },
	210	{ .mask = 1 << 7, .cdev.name = "d11:green", },
	211
	212	{ .mask = 1 << 8, .cdev.name = "d12:green", },
	213	{ .mask = 1 << 9, .cdev.name = "d13:green", },
	214	{ .mask = 1 << 10, .cdev.name = "d14:green", },
	215	{ .mask = 1 << 11, .cdev.name = "d15:green", },
	216
	217	#ifndef CONFIG_LEDS
	218	{ .mask = 1 << 12, .cdev.name = "d16:green", },
	219	{ .mask = 1 << 13, .cdev.name = "d17:green", },
	220	{ .mask = 1 << 14, .cdev.name = "d18:green", },
	221	{ .mask = 1 << 15, .cdev.name = "d19:green", },
	222	#endif
	223	};
	224
	225	static void
	226	fpga_led_set(struct led_classdev *cdev, enum led_brightness value)
	227	{
	228	struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
	229	unsigned long flags;
	230
	231	spin_lock_irqsave(&lock, flags);
	232	if (value == LED_OFF)
	233	hw_led_state &= ~led->mask;
	234	else
	235	hw_led_state \|= led->mask;
	236	__raw_writew(~hw_led_state, &fpga->leds);
	237	spin_unlock_irqrestore(&lock, flags);
	238	}
	239
	240	static void __init newled_init(struct device *dev)
	241	{
	242	unsigned i;
	243	struct dbg_led *led;
	244	int status;
	245
	246	for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) {
	247	led->cdev.brightness_set = fpga_led_set;
	248	status = led_classdev_register(dev, &led->cdev);
	249	if (status < 0)
	250	break;
	251	}
	252	return;
	253	}
	254
	255
	256	/-------------------------------------------------------------------------/
	257
	258	static int /* __init / fpga_probe(struct platform_device pdev)
	259	{
	260	struct resource *iomem;
	261
	262	spin_lock_init(&lock);
	263
264	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
265	if (!iomem)
266	return -ENODEV;
267
268	fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
269	__raw_writew(~0, &fpga->leds);
270
e0b50d3c DB	271	#ifdef CONFIG_LEDS
	272	leds_event = h2p2_dbg_leds_event;
	273	leds_event(led_start);
	274	#endif
994c84ea DB	275
	276	if (new_led_api()) {
	277	newled_init(&pdev->dev);
	278	}
	279
	280	return 0;
	281	}
	282
79ee031f	283	static int fpga_suspend_noirq(struct device *dev)
994c84ea DB	284	{
	285	__raw_writew(~0, &fpga->leds);
	286	return 0;
	287	}
	288
79ee031f	289	static int fpga_resume_noirq(struct device *dev)
994c84ea DB	290	{
	291	__raw_writew(~hw_led_state, &fpga->leds);
	292	return 0;
	293	}
	294
47145210	295	static const struct dev_pm_ops fpga_dev_pm_ops = {
79ee031f MD	296	.suspend_noirq = fpga_suspend_noirq,
	297	.resume_noirq = fpga_resume_noirq,
	298	};
994c84ea DB	299
	300	static struct platform_driver led_driver = {
	301	.driver.name = "omap_dbg_led",
79ee031f	302	.driver.pm = &fpga_dev_pm_ops,
994c84ea	303	.probe = fpga_probe,
994c84ea DB	304	};
	305
	306	static int __init fpga_init(void)
	307	{
	308	if (machine_is_omap_h4()
	309	\|\| machine_is_omap_h3()
	310	\|\| machine_is_omap_h2()
	311	\|\| machine_is_omap_perseus2()
	312	)
	313	return platform_driver_register(&led_driver);
	314	return 0;
	315	}
	316	fs_initcall(fpga_init);