arch/arm/plat-omap/debug-leds.c - kernel/msm-4.9 - Gitiles

 /*
  * 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 <mach/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_LEDS_OMAP_DEBUG
 #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_late(struct platform_device *pdev, pm_message_t mesg)
 {
 	__raw_writew(~0, &fpga->leds);
 	return 0;
 }

 static int fpga_resume_early(struct platform_device *pdev)
 {
 	__raw_writew(~hw_led_state, &fpga->leds);
 	return 0;
 }


 static struct platform_driver led_driver = {
 	.driver.name	= "omap_dbg_led",
 	.probe		= fpga_probe,
 	.suspend_late	= fpga_suspend_late,
 	.resume_early	= fpga_resume_early,
 };

 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);
	/*
	* 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 <mach/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_LEDS_OMAP_DEBUG
	#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_late(struct platform_device *pdev, pm_message_t mesg)
	{
	__raw_writew(~0, &fpga->leds);
	return 0;
	}

	static int fpga_resume_early(struct platform_device *pdev)
	{
	__raw_writew(~hw_led_state, &fpga->leds);
	return 0;
	}


	static struct platform_driver led_driver = {
	.driver.name = "omap_dbg_led",
	.probe = fpga_probe,
	.suspend_late = fpga_suspend_late,
	.resume_early = fpga_resume_early,
	};

	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);