[linux-2.6-block.git] / arch / arm / mach-exynos / pm_domains.c

/*
 * Exynos Generic power domain support.
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Implementation of Exynos specific power domain control which is used in
 * conjunction with runtime-pm. Support for both device-tree and non-device-tree
 * based power domain support is included.
 *
 * 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/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_domain.h>
#include <linux/delay.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/sched.h>

#include "regs-pmu.h"

/*
 * Exynos specific wrapper around the generic power domain
 */
struct exynos_pm_domain {
	void __iomem *base;
	char const *name;
	bool is_off;
	struct generic_pm_domain pd;
};

static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
{
	struct exynos_pm_domain *pd;
	void __iomem *base;
	u32 timeout, pwr;
	char *op;

	pd = container_of(domain, struct exynos_pm_domain, pd);
	base = pd->base;

	pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
	__raw_writel(pwr, base);

	/* Wait max 1ms */
	timeout = 10;

	while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN)	!= pwr) {
		if (!timeout) {
			op = (power_on) ? "enable" : "disable";
			pr_err("Power domain %s %s failed\n", domain->name, op);
			return -ETIMEDOUT;
		}
		timeout--;
		cpu_relax();
		usleep_range(80, 100);
	}
	return 0;
}

static int exynos_pd_power_on(struct generic_pm_domain *domain)
{
	return exynos_pd_power(domain, true);
}

static int exynos_pd_power_off(struct generic_pm_domain *domain)
{
	return exynos_pd_power(domain, false);
}

static void exynos_add_device_to_domain(struct exynos_pm_domain *pd,
					 struct device *dev)
{
	int ret;

	dev_dbg(dev, "adding to power domain %s\n", pd->pd.name);

	while (1) {
		ret = pm_genpd_add_device(&pd->pd, dev);
		if (ret != -EAGAIN)
			break;
		cond_resched();
	}

	pm_genpd_dev_need_restore(dev, true);
}

static void exynos_remove_device_from_domain(struct device *dev)
{
	struct generic_pm_domain *genpd = dev_to_genpd(dev);
	int ret;

	dev_dbg(dev, "removing from power domain %s\n", genpd->name);

	while (1) {
		ret = pm_genpd_remove_device(genpd, dev);
		if (ret != -EAGAIN)
			break;
		cond_resched();
	}
}

static void exynos_read_domain_from_dt(struct device *dev)
{
	struct platform_device *pd_pdev;
	struct exynos_pm_domain *pd;
	struct device_node *node;

	node = of_parse_phandle(dev->of_node, "samsung,power-domain", 0);
	if (!node)
		return;
	pd_pdev = of_find_device_by_node(node);
	if (!pd_pdev)
		return;
	pd = platform_get_drvdata(pd_pdev);
	exynos_add_device_to_domain(pd, dev);
}

static int exynos_pm_notifier_call(struct notifier_block *nb,
				    unsigned long event, void *data)
{
	struct device *dev = data;

	switch (event) {
	case BUS_NOTIFY_BIND_DRIVER:
		if (dev->of_node)
			exynos_read_domain_from_dt(dev);

		break;

	case BUS_NOTIFY_UNBOUND_DRIVER:
		exynos_remove_device_from_domain(dev);

		break;
	}
	return NOTIFY_DONE;
}

static struct notifier_block platform_nb = {
	.notifier_call = exynos_pm_notifier_call,
};

static __init int exynos4_pm_init_power_domain(void)
{
	struct platform_device *pdev;
	struct device_node *np;

	for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
		struct exynos_pm_domain *pd;
		int on;

		pdev = of_find_device_by_node(np);

		pd = kzalloc(sizeof(*pd), GFP_KERNEL);
		if (!pd) {
			pr_err("%s: failed to allocate memory for domain\n",
					__func__);
			return -ENOMEM;
		}

		pd->pd.name = kstrdup(np->name, GFP_KERNEL);
		pd->name = pd->pd.name;
		pd->base = of_iomap(np, 0);
		pd->pd.power_off = exynos_pd_power_off;
		pd->pd.power_on = exynos_pd_power_on;
		pd->pd.of_node = np;

		platform_set_drvdata(pdev, pd);

		on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;

		pm_genpd_init(&pd->pd, NULL, !on);
	}

	bus_register_notifier(&platform_bus_type, &platform_nb);

	return 0;
}
arch_initcall(exynos4_pm_init_power_domain);
Commit	Line	Data
91cfbd4e TA	1	/*
	2	* Exynos Generic power domain support.
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com
	6	*
	7	* Implementation of Exynos specific power domain control which is used in
	8	* conjunction with runtime-pm. Support for both device-tree and non-device-tree
	9	* based power domain support is included.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
	16	#include <linux/io.h>
	17	#include <linux/err.h>
	18	#include <linux/slab.h>
	19	#include <linux/pm_domain.h>
	20	#include <linux/delay.h>
	21	#include <linux/of_address.h>
8a65d236 TF	22	#include <linux/of_platform.h>
8a65d236 TF	23	#include <linux/sched.h>
91cfbd4e	24
65c9a853 KK	25	#include "regs-pmu.h"
65c9a853 KK	26
91cfbd4e TA	27	/*
	28	* Exynos specific wrapper around the generic power domain
	29	*/
	30	struct exynos_pm_domain {
	31	void __iomem *base;
	32	char const *name;
	33	bool is_off;
	34	struct generic_pm_domain pd;
	35	};
	36
	37	static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
	38	{
	39	struct exynos_pm_domain *pd;
	40	void __iomem *base;
	41	u32 timeout, pwr;
	42	char *op;
	43
	44	pd = container_of(domain, struct exynos_pm_domain, pd);
	45	base = pd->base;
	46
	47	pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
	48	__raw_writel(pwr, base);
	49
	50	/* Wait max 1ms */
	51	timeout = 10;
	52
	53	while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN) != pwr) {
	54	if (!timeout) {
	55	op = (power_on) ? "enable" : "disable";
	56	pr_err("Power domain %s %s failed\n", domain->name, op);
	57	return -ETIMEDOUT;
	58	}
	59	timeout--;
	60	cpu_relax();
	61	usleep_range(80, 100);
	62	}
	63	return 0;
	64	}
	65
	66	static int exynos_pd_power_on(struct generic_pm_domain *domain)
	67	{
	68	return exynos_pd_power(domain, true);
	69	}
	70
	71	static int exynos_pd_power_off(struct generic_pm_domain *domain)
	72	{
	73	return exynos_pd_power(domain, false);
	74	}
	75
8a65d236 TF	76	static void exynos_add_device_to_domain(struct exynos_pm_domain *pd,
	77	struct device *dev)
	78	{
	79	int ret;
	80
	81	dev_dbg(dev, "adding to power domain %s\n", pd->pd.name);
	82
	83	while (1) {
	84	ret = pm_genpd_add_device(&pd->pd, dev);
	85	if (ret != -EAGAIN)
	86	break;
	87	cond_resched();
	88	}
	89
	90	pm_genpd_dev_need_restore(dev, true);
	91	}
	92
	93	static void exynos_remove_device_from_domain(struct device *dev)
	94	{
	95	struct generic_pm_domain *genpd = dev_to_genpd(dev);
	96	int ret;
	97
	98	dev_dbg(dev, "removing from power domain %s\n", genpd->name);
	99
	100	while (1) {
	101	ret = pm_genpd_remove_device(genpd, dev);
	102	if (ret != -EAGAIN)
	103	break;
	104	cond_resched();
	105	}
	106	}
	107
	108	static void exynos_read_domain_from_dt(struct device *dev)
	109	{
	110	struct platform_device *pd_pdev;
	111	struct exynos_pm_domain *pd;
	112	struct device_node *node;
	113
	114	node = of_parse_phandle(dev->of_node, "samsung,power-domain", 0);
	115	if (!node)
	116	return;
	117	pd_pdev = of_find_device_by_node(node);
	118	if (!pd_pdev)
	119	return;
	120	pd = platform_get_drvdata(pd_pdev);
	121	exynos_add_device_to_domain(pd, dev);
	122	}
	123
	124	static int exynos_pm_notifier_call(struct notifier_block *nb,
	125	unsigned long event, void *data)
	126	{
	127	struct device *dev = data;
	128
	129	switch (event) {
	130	case BUS_NOTIFY_BIND_DRIVER:
	131	if (dev->of_node)
	132	exynos_read_domain_from_dt(dev);
	133
	134	break;
	135
	136	case BUS_NOTIFY_UNBOUND_DRIVER:
	137	exynos_remove_device_from_domain(dev);
	138
	139	break;
140	}
141	return NOTIFY_DONE;
142	}
143
144	static struct notifier_block platform_nb = {
145	.notifier_call = exynos_pm_notifier_call,
146	};
147
8eaa9e42	148	static __init int exynos4_pm_init_power_domain(void)
91cfbd4e	149	{
8a65d236	150	struct platform_device *pdev;
91cfbd4e TA	151	struct device_node *np;
	152
	153	for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
	154	struct exynos_pm_domain *pd;
2ed5f236	155	int on;
91cfbd4e	156
8a65d236 TF	157	pdev = of_find_device_by_node(np);
8a65d236 TF	158
91cfbd4e TA	159	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
	160	if (!pd) {
	161	pr_err("%s: failed to allocate memory for domain\n",
	162	__func__);
	163	return -ENOMEM;
	164	}
	165
7add0ec0 TF	166	pd->pd.name = kstrdup(np->name, GFP_KERNEL);
7add0ec0 TF	167	pd->name = pd->pd.name;
91cfbd4e TA	168	pd->base = of_iomap(np, 0);
	169	pd->pd.power_off = exynos_pd_power_off;
	170	pd->pd.power_on = exynos_pd_power_on;
	171	pd->pd.of_node = np;
2ed5f236	172
8a65d236 TF	173	platform_set_drvdata(pdev, pd);
8a65d236 TF	174
2ed5f236 TF	175	on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
	176
	177	pm_genpd_init(&pd->pd, NULL, !on);
91cfbd4e	178	}
8a65d236 TF	179
	180	bus_register_notifier(&platform_bus_type, &platform_nb);
	181
91cfbd4e TA	182	return 0;
91cfbd4e TA	183	}
91cfbd4e	184	arch_initcall(exynos4_pm_init_power_domain);