arch/arm/mach-feroceon-kw2/cpuidle.c - kernel/prism - Git at Google

 /*
  * arch/arm/mach-feroceon-kw/cpuidle.c
  *
  * CPU idle Marvell Kirkwood SoCs
  *
  * This file is licensed under the terms of the GNU General Public
  * License version 2.  This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  *
  * The cpu idle uses wait-for-interrupt and DDR self refresh in order
  * to implement two idle states -
  * #1 wait-for-interrupt
  * #2 wait-for-interrupt and DDR self refresh
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/cpuidle.h>
 #include <linux/io.h>
 #include <asm/proc-fns.h>
 #include <linux/proc_fs.h>
 #include <config/mvSysHwConfig.h>
 #include "mvCommon.h"
 #include "mvOs.h"

 #define CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE

 #ifdef CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE
 #include "ctrlEnv/mvCtrlEnvLib.h"
 #endif

 #define KIRKWOOD_MAX_STATES	2

 extern void mv_kw2_cpu_idle_enter(void);

 #ifdef CONFIG_MV_PMU_PROC
 extern struct proc_dir_entry *mv_pm_proc_entry;
 struct proc_dir_entry *cpu_idle_proc;
 #endif /* CONFIG_MV_PMU_PROC */

 static struct cpuidle_device *kirkwood_cpu_idle_device;

 static struct cpuidle_driver kirkwood_idle_driver = {
 	.name =         "kirkwood_idle",
 	.owner =        THIS_MODULE,
 };

 static DEFINE_PER_CPU(struct cpuidle_device, kirkwood_cpuidle_device);

 static int device_registered;
 int support_dram_self_refresh = 0;

 /* Actual code that puts the SoC in different idle states */
 static int kirkwood_enter_idle(struct cpuidle_device *dev,
 			       struct cpuidle_state *state)
 {
 	struct timeval before, after;
 	int idle_time;
 	MV_BOOL pwr_save_on;

 #ifdef CONFIG_JTAG_DEBUG
 	local_irq_enable();
 	return 0;
 #endif

 #ifdef CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE
 	/* Set CPU to fast frequency */
 	pwr_save_on = mvCtrlIsPwrSaveOn();
 	mvCtrlPwrSaveOff();
 #endif /* CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE */

 	local_irq_disable();
 	do_gettimeofday(&before);
 	if (state == &dev->states[0]) {
 		/* Wait for interrupt state */
 		cpu_do_idle();
 	} else if (state == &dev->states[1]) {
 #ifdef CONFIG_MV_PM_IDLE_WFI_SR
 		/*
 		 * Following write will put DDR in self refresh.
 		 * Note that we have 256 cycles before DDR puts it
 		 * self in self-refresh, so the wait-for-interrupt
 		 * call afterwards won't get the DDR from self refresh
 		 * mode.
 		 */
 		writel(0x7, DDR_OPERATION_BASE);
 		cpu_do_idle();
 #endif
 #ifdef CONFIG_MV_PM_IDLE_DEEPIDLE_SR
 		/*
 		 * Following write will put DDR in self refresh.
 		 * Note that we have 256 cycles before DDR puts it
 		 * self in self-refresh, so the wait-for-interrupt
 		 * call afterwards won't get the DDR from self refresh
 		 * mode.
 		 */
 		mv_kw2_cpu_idle_enter();
 #endif
 	}
 	do_gettimeofday(&after);
 	local_irq_enable();

 #ifdef CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE
 	/* Set CPU to fast frequency */
 	if (pwr_save_on == MV_TRUE)
 		mvCtrlPwrSaveOn();
 #endif /* CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE */

 	idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
 			(after.tv_usec - before.tv_usec);
 	return idle_time;
 }

 #ifdef CONFIG_MV_PMU_PROC
 static int mv_cpu_idle_write(struct file *file, const char *buffer,
 		unsigned long count, void *data)
 {
 	MV_U32	regs[4];

 	/* Reading / Writing from system controller internal registers */
 	if (!strncmp (buffer, "enable", strlen("enable"))) {
 		if(device_registered == 0) {
 			device_registered = 1;
 			if (cpuidle_register_device(kirkwood_cpu_idle_device)) {
 				printk(KERN_ERR "mv_cpu_idle_write: Failed registering\n");
 				return -EIO;
 			}
 		}
 		cpuidle_enable_device(kirkwood_cpu_idle_device);
 	} else if (!strncmp (buffer, "disable", strlen("disable"))) {
 		cpuidle_disable_device(kirkwood_cpu_idle_device);
 	} else if (!strncmp (buffer, "test", strlen("test"))) {

 		buffer += strlen("test ");
 		/* Store Interrupt mask registers. */
 		regs[0] = MV_REG_READ(MV_IRQ_MASK_LOW_REG);
 		regs[1] = MV_REG_READ(MV_IRQ_MASK_HIGH_REG);
 		regs[2] = MV_REG_READ(MV_IRQ_MASK_ERROR_REG);

 		/* Disable all interrupts . */
 		MV_REG_WRITE(MV_IRQ_MASK_LOW_REG, 0x0);
 		MV_REG_WRITE(MV_IRQ_MASK_HIGH_REG, 0x0);
 		MV_REG_WRITE(MV_IRQ_MASK_ERROR_REG, 0x0);

 		/* Enable only the UART interrupt. */
 		MV_REG_BIT_SET(MV_IRQ_MASK_HIGH_REG, 1 << (UART_IRQ_NUM(0) - 32));

 		if (!strncmp (buffer, "idle", strlen("idle"))) {
 			printk(KERN_INFO "Press any key to leave deep idle:");
 			mv_kw2_cpu_idle_enter();
 		} else if (!strncmp (buffer, "wfi", strlen("wfi"))) {
 			printk(KERN_INFO "Press any key to leave WFI:");
 			cpu_do_idle();
 		}

 		/* Restore Interrupt mask registers. */
 		MV_REG_WRITE(MV_IRQ_MASK_LOW_REG, regs[0]);
 		MV_REG_WRITE(MV_IRQ_MASK_HIGH_REG, regs[1]);
 		MV_REG_WRITE(MV_IRQ_MASK_ERROR_REG, regs[2]);
 	} else if (!strncmp (buffer, "sr_enable", strlen("sr_enable"))) {
 		local_irq_disable();
 		support_dram_self_refresh = 1;
 		local_irq_enable();
 	} else if (!strncmp (buffer, "sr_disable", strlen("sr_disable"))) {
 		local_irq_disable();
 		support_dram_self_refresh = 0;
 		local_irq_enable();
 	}


 	return count;
 }


 static int mv_cpu_idle_read(char *buffer, char **buffer_location, off_t offset,
 		int buffer_length, int *zero, void *ptr)
 {
 	if (offset > 0)
 		return 0;
 	return sprintf(buffer, "enable - Enable CPU Idle framework.\n"
 				"disable - Disable CPU idle framework.\n"
 				"test (idle / wfi) - Manually enter CPU Idle state, exit by key stroke (DEBUG ONLY).\n"
 				"sr_enable / sr_disable - Enable / Disable DRAM Self-Refresh when entering deel-idle.\n");

 }

 #endif /* CONFIG_MV_PMU_PROC */

 /* Initialize CPU idle by registering the idle states */
 static int kw_cpuidle_probe(struct platform_device *pdev)
 {
 	struct cpuidle_device *device;

 	cpuidle_register_driver(&kirkwood_idle_driver);

 	device = &per_cpu(kirkwood_cpuidle_device, smp_processor_id());
 	device->state_count = KIRKWOOD_MAX_STATES;

 	/* Wait for interrupt state */
 	device->states[0].enter = kirkwood_enter_idle;
 	device->states[0].exit_latency = 1;
 	device->states[0].target_residency = 100;
 	device->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
 	strcpy(device->states[0].name, "WFI");
 	strcpy(device->states[0].desc, "Wait for interrupt");

 #ifdef CONFIG_MV_PM_IDLE_WFI_SR
 	/* Wait for interrupt and DDR self refresh state */
 	device->states[1].enter = kirkwood_enter_idle;
 	device->states[1].exit_latency = 10;
 	device->states[1].target_residency = 1000;
 	device->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
 	strcpy(device->states[1].name, "DDR SR");
 	strcpy(device->states[1].desc, "WFI and DDR Self Refresh");
 #endif

 #ifdef CONFIG_MV_PM_IDLE_DEEPIDLE_SR
 	/* CPU Deep Idle state */
 	device->states[1].enter = kirkwood_enter_idle;
 	device->states[1].exit_latency = 10;
 	device->states[1].target_residency = 5000;
 	device->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
 	strcpy(device->states[1].name, "DEEP IDLE");
 	strcpy(device->states[1].desc, "CPU Deep Idle");
 #endif

 #if 0
 	if (cpuidle_register_device(device)) {
 		printk(KERN_ERR "kirkwood_init_cpuidle: Failed registering\n");
 		return -EIO;
 	}
 #endif
 	kirkwood_cpu_idle_device = device;

 #ifdef CONFIG_MV_PMU_PROC
 	/* Create proc entry. */
 	cpu_idle_proc = create_proc_entry("cpu_idle", 0666, mv_pm_proc_entry);
 	cpu_idle_proc->read_proc = mv_cpu_idle_read;
 	cpu_idle_proc->write_proc = mv_cpu_idle_write;
 	cpu_idle_proc->nlink = 1;
 #endif /* CONFIG_MV_PMU_PROC */

 	return 0;
 }

 static int kw_cpuidle_remove(struct platform_device *pdev)
 {
 #ifdef CONFIG_MV_PMU_PROC
 	remove_proc_entry("cpu_idle", cpu_idle_proc);
 #endif
 	cpuidle_unregister_device(kirkwood_cpu_idle_device);
 	return 0;
 }

 struct platform_driver kw_cpuidle_driver = {
 	.probe		= kw_cpuidle_probe,
 	.remove		= kw_cpuidle_remove,
 	.driver		= {
 		.name	= "kw_cpuidle",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init kw_cpuidle_drv_init(void)
 {
 	if (MV_6601_DEV_ID == mvCtrlModelGet())
 		return 0;

 	device_registered = 0;
 	return platform_driver_register(&kw_cpuidle_driver);

 }

 static void __exit kw_cpuidle_drv_cleanup(void)
 {
 	platform_driver_unregister(&kw_cpuidle_driver);
 }

 module_init(kw_cpuidle_drv_init);
 module_exit(kw_cpuidle_drv_cleanup);
	/*
	* arch/arm/mach-feroceon-kw/cpuidle.c
	*
	* CPU idle Marvell Kirkwood SoCs
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*
	* The cpu idle uses wait-for-interrupt and DDR self refresh in order
	* to implement two idle states -
	* #1 wait-for-interrupt
	* #2 wait-for-interrupt and DDR self refresh
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/cpuidle.h>
	#include <linux/io.h>
	#include <asm/proc-fns.h>
	#include <linux/proc_fs.h>
	#include <config/mvSysHwConfig.h>
	#include "mvCommon.h"
	#include "mvOs.h"

	#define CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE

	#ifdef CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE
	#include "ctrlEnv/mvCtrlEnvLib.h"
	#endif

	#define KIRKWOOD_MAX_STATES 2

	extern void mv_kw2_cpu_idle_enter(void);

	#ifdef CONFIG_MV_PMU_PROC
	extern struct proc_dir_entry *mv_pm_proc_entry;
	struct proc_dir_entry *cpu_idle_proc;
	#endif /* CONFIG_MV_PMU_PROC */

	static struct cpuidle_device *kirkwood_cpu_idle_device;

	static struct cpuidle_driver kirkwood_idle_driver = {
	.name = "kirkwood_idle",
	.owner = THIS_MODULE,
	};

	static DEFINE_PER_CPU(struct cpuidle_device, kirkwood_cpuidle_device);

	static int device_registered;
	int support_dram_self_refresh = 0;

	/* Actual code that puts the SoC in different idle states */
	static int kirkwood_enter_idle(struct cpuidle_device *dev,
	struct cpuidle_state *state)
	{
	struct timeval before, after;
	int idle_time;
	MV_BOOL pwr_save_on;

	#ifdef CONFIG_JTAG_DEBUG
	local_irq_enable();
	return 0;
	#endif

	#ifdef CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE
	/* Set CPU to fast frequency */
	pwr_save_on = mvCtrlIsPwrSaveOn();
	mvCtrlPwrSaveOff();
	#endif /* CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE */

	local_irq_disable();
	do_gettimeofday(&before);
	if (state == &dev->states[0]) {
	/* Wait for interrupt state */
	cpu_do_idle();
	} else if (state == &dev->states[1]) {
	#ifdef CONFIG_MV_PM_IDLE_WFI_SR
	/*
	* Following write will put DDR in self refresh.
	* Note that we have 256 cycles before DDR puts it
	* self in self-refresh, so the wait-for-interrupt
	* call afterwards won't get the DDR from self refresh
	* mode.
	*/
	writel(0x7, DDR_OPERATION_BASE);
	cpu_do_idle();
	#endif
	#ifdef CONFIG_MV_PM_IDLE_DEEPIDLE_SR
	/*
	* Following write will put DDR in self refresh.
	* Note that we have 256 cycles before DDR puts it
	* self in self-refresh, so the wait-for-interrupt
	* call afterwards won't get the DDR from self refresh
	* mode.
	*/
	mv_kw2_cpu_idle_enter();
	#endif
	}
	do_gettimeofday(&after);
	local_irq_enable();

	#ifdef CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE
	/* Set CPU to fast frequency */
	if (pwr_save_on == MV_TRUE)
	mvCtrlPwrSaveOn();
	#endif /* CONFIG_CPUFREQ_TOGGLE_ON_DEEPIDLE */

	idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
	(after.tv_usec - before.tv_usec);
	return idle_time;
	}

	#ifdef CONFIG_MV_PMU_PROC
	static int mv_cpu_idle_write(struct file file, const char buffer,
	unsigned long count, void *data)
	{
	MV_U32 regs[4];

	/* Reading / Writing from system controller internal registers */
	if (!strncmp (buffer, "enable", strlen("enable"))) {
	if(device_registered == 0) {
	device_registered = 1;
	if (cpuidle_register_device(kirkwood_cpu_idle_device)) {
	printk(KERN_ERR "mv_cpu_idle_write: Failed registering\n");
	return -EIO;
	}
	}
	cpuidle_enable_device(kirkwood_cpu_idle_device);
	} else if (!strncmp (buffer, "disable", strlen("disable"))) {
	cpuidle_disable_device(kirkwood_cpu_idle_device);
	} else if (!strncmp (buffer, "test", strlen("test"))) {

	buffer += strlen("test ");
	/* Store Interrupt mask registers. */
	regs[0] = MV_REG_READ(MV_IRQ_MASK_LOW_REG);
	regs[1] = MV_REG_READ(MV_IRQ_MASK_HIGH_REG);
	regs[2] = MV_REG_READ(MV_IRQ_MASK_ERROR_REG);

	/* Disable all interrupts . */
	MV_REG_WRITE(MV_IRQ_MASK_LOW_REG, 0x0);
	MV_REG_WRITE(MV_IRQ_MASK_HIGH_REG, 0x0);
	MV_REG_WRITE(MV_IRQ_MASK_ERROR_REG, 0x0);

	/* Enable only the UART interrupt. */
	MV_REG_BIT_SET(MV_IRQ_MASK_HIGH_REG, 1 << (UART_IRQ_NUM(0) - 32));

	if (!strncmp (buffer, "idle", strlen("idle"))) {
	printk(KERN_INFO "Press any key to leave deep idle:");
	mv_kw2_cpu_idle_enter();
	} else if (!strncmp (buffer, "wfi", strlen("wfi"))) {
	printk(KERN_INFO "Press any key to leave WFI:");
	cpu_do_idle();
	}

	/* Restore Interrupt mask registers. */
	MV_REG_WRITE(MV_IRQ_MASK_LOW_REG, regs[0]);
	MV_REG_WRITE(MV_IRQ_MASK_HIGH_REG, regs[1]);
	MV_REG_WRITE(MV_IRQ_MASK_ERROR_REG, regs[2]);
	} else if (!strncmp (buffer, "sr_enable", strlen("sr_enable"))) {
	local_irq_disable();
	support_dram_self_refresh = 1;
	local_irq_enable();
	} else if (!strncmp (buffer, "sr_disable", strlen("sr_disable"))) {
	local_irq_disable();
	support_dram_self_refresh = 0;
	local_irq_enable();
	}


	return count;
	}


	static int mv_cpu_idle_read(char buffer, char *buffer_location, off_t offset,
	int buffer_length, int zero, void ptr)
	{
	if (offset > 0)
	return 0;
	return sprintf(buffer, "enable - Enable CPU Idle framework.\n"
	"disable - Disable CPU idle framework.\n"
	"test (idle / wfi) - Manually enter CPU Idle state, exit by key stroke (DEBUG ONLY).\n"
	"sr_enable / sr_disable - Enable / Disable DRAM Self-Refresh when entering deel-idle.\n");

	}

	#endif /* CONFIG_MV_PMU_PROC */

	/* Initialize CPU idle by registering the idle states */
	static int kw_cpuidle_probe(struct platform_device *pdev)
	{
	struct cpuidle_device *device;

	cpuidle_register_driver(&kirkwood_idle_driver);

	device = &per_cpu(kirkwood_cpuidle_device, smp_processor_id());
	device->state_count = KIRKWOOD_MAX_STATES;

	/* Wait for interrupt state */
	device->states[0].enter = kirkwood_enter_idle;
	device->states[0].exit_latency = 1;
	device->states[0].target_residency = 100;
	device->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
	strcpy(device->states[0].name, "WFI");
	strcpy(device->states[0].desc, "Wait for interrupt");

	#ifdef CONFIG_MV_PM_IDLE_WFI_SR
	/* Wait for interrupt and DDR self refresh state */
	device->states[1].enter = kirkwood_enter_idle;
	device->states[1].exit_latency = 10;
	device->states[1].target_residency = 1000;
	device->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
	strcpy(device->states[1].name, "DDR SR");
	strcpy(device->states[1].desc, "WFI and DDR Self Refresh");
	#endif

	#ifdef CONFIG_MV_PM_IDLE_DEEPIDLE_SR
	/* CPU Deep Idle state */
	device->states[1].enter = kirkwood_enter_idle;
	device->states[1].exit_latency = 10;
	device->states[1].target_residency = 5000;
	device->states[1].flags = CPUIDLE_FLAG_TIME_VALID;
	strcpy(device->states[1].name, "DEEP IDLE");
	strcpy(device->states[1].desc, "CPU Deep Idle");
	#endif

	#if 0
	if (cpuidle_register_device(device)) {
	printk(KERN_ERR "kirkwood_init_cpuidle: Failed registering\n");
	return -EIO;
	}
	#endif
	kirkwood_cpu_idle_device = device;

	#ifdef CONFIG_MV_PMU_PROC
	/* Create proc entry. */
	cpu_idle_proc = create_proc_entry("cpu_idle", 0666, mv_pm_proc_entry);
	cpu_idle_proc->read_proc = mv_cpu_idle_read;
	cpu_idle_proc->write_proc = mv_cpu_idle_write;
	cpu_idle_proc->nlink = 1;
	#endif /* CONFIG_MV_PMU_PROC */

	return 0;
	}

	static int kw_cpuidle_remove(struct platform_device *pdev)
	{
	#ifdef CONFIG_MV_PMU_PROC
	remove_proc_entry("cpu_idle", cpu_idle_proc);
	#endif
	cpuidle_unregister_device(kirkwood_cpu_idle_device);
	return 0;
	}

	struct platform_driver kw_cpuidle_driver = {
	.probe = kw_cpuidle_probe,
	.remove = kw_cpuidle_remove,
	.driver = {
	.name = "kw_cpuidle",
	.owner = THIS_MODULE,
	},
	};

	static int __init kw_cpuidle_drv_init(void)
	{
	if (MV_6601_DEV_ID == mvCtrlModelGet())
	return 0;

	device_registered = 0;
	return platform_driver_register(&kw_cpuidle_driver);

	}

	static void __exit kw_cpuidle_drv_cleanup(void)
	{
	platform_driver_unregister(&kw_cpuidle_driver);
	}

	module_init(kw_cpuidle_drv_init);
	module_exit(kw_cpuidle_drv_cleanup);