arch/arm/plat-samsung/pm.c - maze/linux - Git at Google

 /* linux/arch/arm/plat-s3c/pm.c
  *
  * Copyright 2008 Openmoko, Inc.
  * Copyright 2004-2008 Simtec Electronics
  *	Ben Dooks <ben@simtec.co.uk>
  *	http://armlinux.simtec.co.uk/
  *
  * S3C common power management (suspend to ram) support.
  *
  * 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/suspend.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
 #include <linux/of.h>
 #include <linux/serial_core.h>
 #include <linux/io.h>

 #include <asm/cacheflush.h>
 #include <asm/suspend.h>

 #include <plat/regs-serial.h>

 #ifdef CONFIG_SAMSUNG_ATAGS
 #include <mach/hardware.h>
 #include <mach/map.h>
 #include <mach/regs-clock.h>
 #include <mach/regs-irq.h>
 #include <mach/irqs.h>
 #endif

 #include <asm/irq.h>

 #include <plat/pm.h>
 #include <mach/pm-core.h>

 /* for external use */

 unsigned long s3c_pm_flags;

 /* Debug code:
  *
  * This code supports debug output to the low level UARTs for use on
  * resume before the console layer is available.
 */

 #ifdef CONFIG_SAMSUNG_PM_DEBUG
 extern void printascii(const char *);

 void s3c_pm_dbg(const char *fmt, ...)
 {
 	va_list va;
 	char buff[256];

 	va_start(va, fmt);
 	vsnprintf(buff, sizeof(buff), fmt, va);
 	va_end(va);

 	printascii(buff);
 }

 static inline void s3c_pm_debug_init(void)
 {
 	/* restart uart clocks so we can use them to output */
 	s3c_pm_debug_init_uart();
 }

 #else
 #define s3c_pm_debug_init() do { } while(0)

 #endif /* CONFIG_SAMSUNG_PM_DEBUG */

 /* Save the UART configurations if we are configured for debug. */

 unsigned char pm_uart_udivslot;

 #ifdef CONFIG_SAMSUNG_PM_DEBUG

 static struct pm_uart_save uart_save;

 static void s3c_pm_save_uart(unsigned int uart, struct pm_uart_save *save)
 {
 	void __iomem *regs = S3C_VA_UARTx(uart);

 	save->ulcon = __raw_readl(regs + S3C2410_ULCON);
 	save->ucon = __raw_readl(regs + S3C2410_UCON);
 	save->ufcon = __raw_readl(regs + S3C2410_UFCON);
 	save->umcon = __raw_readl(regs + S3C2410_UMCON);
 	save->ubrdiv = __raw_readl(regs + S3C2410_UBRDIV);

 	if (pm_uart_udivslot)
 		save->udivslot = __raw_readl(regs + S3C2443_DIVSLOT);

 	S3C_PMDBG("UART[%d]: ULCON=%04x, UCON=%04x, UFCON=%04x, UBRDIV=%04x\n",
 		  uart, save->ulcon, save->ucon, save->ufcon, save->ubrdiv);
 }

 static void s3c_pm_save_uarts(void)
 {
 	s3c_pm_save_uart(CONFIG_DEBUG_S3C_UART, &uart_save);
 }

 static void s3c_pm_restore_uart(unsigned int uart, struct pm_uart_save *save)
 {
 	void __iomem *regs = S3C_VA_UARTx(uart);

 	s3c_pm_arch_update_uart(regs, save);

 	__raw_writel(save->ulcon, regs + S3C2410_ULCON);
 	__raw_writel(save->ucon,  regs + S3C2410_UCON);
 	__raw_writel(save->ufcon, regs + S3C2410_UFCON);
 	__raw_writel(save->umcon, regs + S3C2410_UMCON);
 	__raw_writel(save->ubrdiv, regs + S3C2410_UBRDIV);

 	if (pm_uart_udivslot)
 		__raw_writel(save->udivslot, regs + S3C2443_DIVSLOT);
 }

 static void s3c_pm_restore_uarts(void)
 {
 	s3c_pm_restore_uart(CONFIG_DEBUG_S3C_UART, &uart_save);
 }
 #else
 static void s3c_pm_save_uarts(void) { }
 static void s3c_pm_restore_uarts(void) { }
 #endif

 /* The IRQ ext-int code goes here, it is too small to currently bother
  * with its own file. */

 unsigned long s3c_irqwake_intmask	= 0xffffffffL;
 unsigned long s3c_irqwake_eintmask	= 0xffffffffL;

 int s3c_irqext_wake(struct irq_data *data, unsigned int state)
 {
 	unsigned long bit = 1L << IRQ_EINT_BIT(data->irq);

 	if (!(s3c_irqwake_eintallow & bit))
 		return -ENOENT;

 	printk(KERN_INFO "wake %s for irq %d\n",
 	       state ? "enabled" : "disabled", data->irq);

 	if (!state)
 		s3c_irqwake_eintmask |= bit;
 	else
 		s3c_irqwake_eintmask &= ~bit;

 	return 0;
 }

 /* helper functions to save and restore register state */

 /**
  * s3c_pm_do_save() - save a set of registers for restoration on resume.
  * @ptr: Pointer to an array of registers.
  * @count: Size of the ptr array.
  *
  * Run through the list of registers given, saving their contents in the
  * array for later restoration when we wakeup.
  */
 void s3c_pm_do_save(struct sleep_save *ptr, int count)
 {
 	for (; count > 0; count--, ptr++) {
 		ptr->val = __raw_readl(ptr->reg);
 		S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
 	}
 }

 /**
  * s3c_pm_do_restore() - restore register values from the save list.
  * @ptr: Pointer to an array of registers.
  * @count: Size of the ptr array.
  *
  * Restore the register values saved from s3c_pm_do_save().
  *
  * Note, we do not use S3C_PMDBG() in here, as the system may not have
  * restore the UARTs state yet
 */

 void s3c_pm_do_restore(struct sleep_save *ptr, int count)
 {
 	for (; count > 0; count--, ptr++) {
 		printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n",
 		       ptr->reg, ptr->val, __raw_readl(ptr->reg));

 		__raw_writel(ptr->val, ptr->reg);
 	}
 }

 /**
  * s3c_pm_do_restore_core() - early restore register values from save list.
  *
  * This is similar to s3c_pm_do_restore() except we try and minimise the
  * side effects of the function in case registers that hardware might need
  * to work has been restored.
  *
  * WARNING: Do not put any debug in here that may effect memory or use
  * peripherals, as things may be changing!
 */

 void s3c_pm_do_restore_core(struct sleep_save *ptr, int count)
 {
 	for (; count > 0; count--, ptr++)
 		__raw_writel(ptr->val, ptr->reg);
 }

 /* s3c2410_pm_show_resume_irqs
  *
  * print any IRQs asserted at resume time (ie, we woke from)
 */
 static void __maybe_unused s3c_pm_show_resume_irqs(int start,
 						   unsigned long which,
 						   unsigned long mask)
 {
 	int i;

 	which &= ~mask;

 	for (i = 0; i <= 31; i++) {
 		if (which & (1L<<i)) {
 			S3C_PMDBG("IRQ %d asserted at resume\n", start+i);
 		}
 	}
 }


 void (*pm_cpu_prep)(void);
 int (*pm_cpu_sleep)(unsigned long);

 #define any_allowed(mask, allow) (((mask) & (allow)) != (allow))

 /* s3c_pm_enter
  *
  * central control for sleep/resume process
 */

 static int s3c_pm_enter(suspend_state_t state)
 {
 	int ret;
 	/* ensure the debug is initialised (if enabled) */

 	s3c_pm_debug_init();

 	S3C_PMDBG("%s(%d)\n", __func__, state);

 	if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) {
 		printk(KERN_ERR "%s: error: no cpu sleep function\n", __func__);
 		return -EINVAL;
 	}

 	/* check if we have anything to wake-up with... bad things seem
 	 * to happen if you suspend with no wakeup (system will often
 	 * require a full power-cycle)
 	*/

 	if (!of_have_populated_dt() &&
 	    !any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
 	    !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
 		printk(KERN_ERR "%s: No wake-up sources!\n", __func__);
 		printk(KERN_ERR "%s: Aborting sleep\n", __func__);
 		return -EINVAL;
 	}

 	/* save all necessary core registers not covered by the drivers */

 	if (!of_have_populated_dt()) {
 		samsung_pm_save_gpios();
 		samsung_pm_saved_gpios();
 	}

 	s3c_pm_save_uarts();
 	s3c_pm_save_core();

 	/* set the irq configuration for wake */

 	s3c_pm_configure_extint();

 	S3C_PMDBG("sleep: irq wakeup masks: %08lx,%08lx\n",
 	    s3c_irqwake_intmask, s3c_irqwake_eintmask);

 	s3c_pm_arch_prepare_irqs();

 	/* call cpu specific preparation */

 	pm_cpu_prep();

 	/* flush cache back to ram */

 	flush_cache_all();

 	s3c_pm_check_store();

 	/* send the cpu to sleep... */

 	s3c_pm_arch_stop_clocks();

 	/* this will also act as our return point from when
 	 * we resume as it saves its own register state and restores it
 	 * during the resume.  */

 	ret = cpu_suspend(0, pm_cpu_sleep);
 	if (ret)
 		return ret;

 	/* restore the system state */

 	s3c_pm_restore_core();
 	s3c_pm_restore_uarts();

 	if (!of_have_populated_dt()) {
 		samsung_pm_restore_gpios();
 		s3c_pm_restored_gpios();
 	}

 	s3c_pm_debug_init();

 	/* check what irq (if any) restored the system */

 	s3c_pm_arch_show_resume_irqs();

 	S3C_PMDBG("%s: post sleep, preparing to return\n", __func__);

 	/* LEDs should now be 1110 */
 	s3c_pm_debug_smdkled(1 << 1, 0);

 	s3c_pm_check_restore();

 	/* ok, let's return from sleep */

 	S3C_PMDBG("S3C PM Resume (post-restore)\n");
 	return 0;
 }

 static int s3c_pm_prepare(void)
 {
 	/* prepare check area if configured */

 	s3c_pm_check_prepare();
 	return 0;
 }

 static void s3c_pm_finish(void)
 {
 	s3c_pm_check_cleanup();
 }

 static const struct platform_suspend_ops s3c_pm_ops = {
 	.enter		= s3c_pm_enter,
 	.prepare	= s3c_pm_prepare,
 	.finish		= s3c_pm_finish,
 	.valid		= suspend_valid_only_mem,
 };

 /* s3c_pm_init
  *
  * Attach the power management functions. This should be called
  * from the board specific initialisation if the board supports
  * it.
 */

 int __init s3c_pm_init(void)
 {
 	printk("S3C Power Management, Copyright 2004 Simtec Electronics\n");

 	suspend_set_ops(&s3c_pm_ops);
 	return 0;
 }
	/* linux/arch/arm/plat-s3c/pm.c
	*
	* Copyright 2008 Openmoko, Inc.
	* Copyright 2004-2008 Simtec Electronics
	* Ben Dooks <ben@simtec.co.uk>
	* http://armlinux.simtec.co.uk/
	*
	* S3C common power management (suspend to ram) support.
	*
	* 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/suspend.h>
	#include <linux/errno.h>
	#include <linux/delay.h>
	#include <linux/of.h>
	#include <linux/serial_core.h>
	#include <linux/io.h>

	#include <asm/cacheflush.h>
	#include <asm/suspend.h>

	#include <plat/regs-serial.h>

	#ifdef CONFIG_SAMSUNG_ATAGS
	#include <mach/hardware.h>
	#include <mach/map.h>
	#include <mach/regs-clock.h>
	#include <mach/regs-irq.h>
	#include <mach/irqs.h>
	#endif

	#include <asm/irq.h>

	#include <plat/pm.h>
	#include <mach/pm-core.h>

	/* for external use */

	unsigned long s3c_pm_flags;

	/* Debug code:
	*
	* This code supports debug output to the low level UARTs for use on
	* resume before the console layer is available.
	*/

	#ifdef CONFIG_SAMSUNG_PM_DEBUG
	extern void printascii(const char *);

	void s3c_pm_dbg(const char *fmt, ...)
	{
	va_list va;
	char buff[256];

	va_start(va, fmt);
	vsnprintf(buff, sizeof(buff), fmt, va);
	va_end(va);

	printascii(buff);
	}

	static inline void s3c_pm_debug_init(void)
	{
	/* restart uart clocks so we can use them to output */
	s3c_pm_debug_init_uart();
	}

	#else
	#define s3c_pm_debug_init() do { } while(0)

	#endif /* CONFIG_SAMSUNG_PM_DEBUG */

	/* Save the UART configurations if we are configured for debug. */

	unsigned char pm_uart_udivslot;

	#ifdef CONFIG_SAMSUNG_PM_DEBUG

	static struct pm_uart_save uart_save;

	static void s3c_pm_save_uart(unsigned int uart, struct pm_uart_save *save)
	{
	void __iomem *regs = S3C_VA_UARTx(uart);

	save->ulcon = __raw_readl(regs + S3C2410_ULCON);
	save->ucon = __raw_readl(regs + S3C2410_UCON);
	save->ufcon = __raw_readl(regs + S3C2410_UFCON);
	save->umcon = __raw_readl(regs + S3C2410_UMCON);
	save->ubrdiv = __raw_readl(regs + S3C2410_UBRDIV);

	if (pm_uart_udivslot)
	save->udivslot = __raw_readl(regs + S3C2443_DIVSLOT);

	S3C_PMDBG("UART[%d]: ULCON=%04x, UCON=%04x, UFCON=%04x, UBRDIV=%04x\n",
	uart, save->ulcon, save->ucon, save->ufcon, save->ubrdiv);
	}

	static void s3c_pm_save_uarts(void)
	{
	s3c_pm_save_uart(CONFIG_DEBUG_S3C_UART, &uart_save);
	}

	static void s3c_pm_restore_uart(unsigned int uart, struct pm_uart_save *save)
	{
	void __iomem *regs = S3C_VA_UARTx(uart);

	s3c_pm_arch_update_uart(regs, save);

	__raw_writel(save->ulcon, regs + S3C2410_ULCON);
	__raw_writel(save->ucon, regs + S3C2410_UCON);
	__raw_writel(save->ufcon, regs + S3C2410_UFCON);
	__raw_writel(save->umcon, regs + S3C2410_UMCON);
	__raw_writel(save->ubrdiv, regs + S3C2410_UBRDIV);

	if (pm_uart_udivslot)
	__raw_writel(save->udivslot, regs + S3C2443_DIVSLOT);
	}

	static void s3c_pm_restore_uarts(void)
	{
	s3c_pm_restore_uart(CONFIG_DEBUG_S3C_UART, &uart_save);
	}
	#else
	static void s3c_pm_save_uarts(void) { }
	static void s3c_pm_restore_uarts(void) { }
	#endif

	/* The IRQ ext-int code goes here, it is too small to currently bother
	* with its own file. */

	unsigned long s3c_irqwake_intmask = 0xffffffffL;
	unsigned long s3c_irqwake_eintmask = 0xffffffffL;

	int s3c_irqext_wake(struct irq_data *data, unsigned int state)
	{
	unsigned long bit = 1L << IRQ_EINT_BIT(data->irq);

	if (!(s3c_irqwake_eintallow & bit))
	return -ENOENT;

	printk(KERN_INFO "wake %s for irq %d\n",
	state ? "enabled" : "disabled", data->irq);

	if (!state)
	s3c_irqwake_eintmask \|= bit;
	else
	s3c_irqwake_eintmask &= ~bit;

	return 0;
	}

	/* helper functions to save and restore register state */

	/**
	* s3c_pm_do_save() - save a set of registers for restoration on resume.
	* @ptr: Pointer to an array of registers.
	* @count: Size of the ptr array.
	*
	* Run through the list of registers given, saving their contents in the
	* array for later restoration when we wakeup.
	*/
	void s3c_pm_do_save(struct sleep_save *ptr, int count)
	{
	for (; count > 0; count--, ptr++) {
	ptr->val = __raw_readl(ptr->reg);
	S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
	}
	}

	/**
	* s3c_pm_do_restore() - restore register values from the save list.
	* @ptr: Pointer to an array of registers.
	* @count: Size of the ptr array.
	*
	* Restore the register values saved from s3c_pm_do_save().
	*
	* Note, we do not use S3C_PMDBG() in here, as the system may not have
	* restore the UARTs state yet
	*/

	void s3c_pm_do_restore(struct sleep_save *ptr, int count)
	{
	for (; count > 0; count--, ptr++) {
	printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n",
	ptr->reg, ptr->val, __raw_readl(ptr->reg));

	__raw_writel(ptr->val, ptr->reg);
	}
	}

	/**
	* s3c_pm_do_restore_core() - early restore register values from save list.
	*
	* This is similar to s3c_pm_do_restore() except we try and minimise the
	* side effects of the function in case registers that hardware might need
	* to work has been restored.
	*
	* WARNING: Do not put any debug in here that may effect memory or use
	* peripherals, as things may be changing!
	*/

	void s3c_pm_do_restore_core(struct sleep_save *ptr, int count)
	{
	for (; count > 0; count--, ptr++)
	__raw_writel(ptr->val, ptr->reg);
	}

	/* s3c2410_pm_show_resume_irqs
	*
	* print any IRQs asserted at resume time (ie, we woke from)
	*/
	static void __maybe_unused s3c_pm_show_resume_irqs(int start,
	unsigned long which,
	unsigned long mask)
	{
	int i;

	which &= ~mask;

	for (i = 0; i <= 31; i++) {
	if (which & (1L<<i)) {
	S3C_PMDBG("IRQ %d asserted at resume\n", start+i);
	}
	}
	}


	void (*pm_cpu_prep)(void);
	int (*pm_cpu_sleep)(unsigned long);

	#define any_allowed(mask, allow) (((mask) & (allow)) != (allow))

	/* s3c_pm_enter
	*
	* central control for sleep/resume process
	*/

	static int s3c_pm_enter(suspend_state_t state)
	{
	int ret;
	/* ensure the debug is initialised (if enabled) */

	s3c_pm_debug_init();

	S3C_PMDBG("%s(%d)\n", __func__, state);

	if (pm_cpu_prep == NULL \|\| pm_cpu_sleep == NULL) {
	printk(KERN_ERR "%s: error: no cpu sleep function\n", __func__);
	return -EINVAL;
	}

	/* check if we have anything to wake-up with... bad things seem
	* to happen if you suspend with no wakeup (system will often
	* require a full power-cycle)
	*/

	if (!of_have_populated_dt() &&
	!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
	!any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
	printk(KERN_ERR "%s: No wake-up sources!\n", __func__);
	printk(KERN_ERR "%s: Aborting sleep\n", __func__);
	return -EINVAL;
	}

	/* save all necessary core registers not covered by the drivers */

	if (!of_have_populated_dt()) {
	samsung_pm_save_gpios();
	samsung_pm_saved_gpios();
	}

	s3c_pm_save_uarts();
	s3c_pm_save_core();

	/* set the irq configuration for wake */

	s3c_pm_configure_extint();

	S3C_PMDBG("sleep: irq wakeup masks: %08lx,%08lx\n",
	s3c_irqwake_intmask, s3c_irqwake_eintmask);

	s3c_pm_arch_prepare_irqs();

	/* call cpu specific preparation */

	pm_cpu_prep();

	/* flush cache back to ram */

	flush_cache_all();

	s3c_pm_check_store();

	/* send the cpu to sleep... */

	s3c_pm_arch_stop_clocks();

	/* this will also act as our return point from when
	* we resume as it saves its own register state and restores it
	* during the resume. */

	ret = cpu_suspend(0, pm_cpu_sleep);
	if (ret)
	return ret;

	/* restore the system state */

	s3c_pm_restore_core();
	s3c_pm_restore_uarts();

	if (!of_have_populated_dt()) {
	samsung_pm_restore_gpios();
	s3c_pm_restored_gpios();
	}

	s3c_pm_debug_init();

	/* check what irq (if any) restored the system */

	s3c_pm_arch_show_resume_irqs();

	S3C_PMDBG("%s: post sleep, preparing to return\n", __func__);

	/* LEDs should now be 1110 */
	s3c_pm_debug_smdkled(1 << 1, 0);

	s3c_pm_check_restore();

	/* ok, let's return from sleep */

	S3C_PMDBG("S3C PM Resume (post-restore)\n");
	return 0;
	}

	static int s3c_pm_prepare(void)
	{
	/* prepare check area if configured */

	s3c_pm_check_prepare();
	return 0;
	}

	static void s3c_pm_finish(void)
	{
	s3c_pm_check_cleanup();
	}

	static const struct platform_suspend_ops s3c_pm_ops = {
	.enter = s3c_pm_enter,
	.prepare = s3c_pm_prepare,
	.finish = s3c_pm_finish,
	.valid = suspend_valid_only_mem,
	};

	/* s3c_pm_init
	*
	* Attach the power management functions. This should be called
	* from the board specific initialisation if the board supports
	* it.
	*/

	int __init s3c_pm_init(void)
	{
	printk("S3C Power Management, Copyright 2004 Simtec Electronics\n");

	suspend_set_ops(&s3c_pm_ops);
	return 0;
	}