[mirror_ubuntu-artful-kernel.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/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/io.h>

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

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