[linux-2.6-block.git] / arch / arm / mach-prima2 / pm.c

/*
 * power management entry for CSR SiRFprimaII
 *
 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
 *
 * Licensed under GPLv2 or later.
 */

#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/io.h>
#include <linux/rtc/sirfsoc_rtciobrg.h>
#include <asm/suspend.h>
#include <asm/hardware/cache-l2x0.h>

#include "pm.h"

/*
 * suspend asm codes will access these to make DRAM become self-refresh and
 * system sleep
 */
u32 sirfsoc_pwrc_base;
void __iomem *sirfsoc_memc_base;

static void sirfsoc_set_wakeup_source(void)
{
	u32 pwr_trigger_en_reg;
	pwr_trigger_en_reg = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
		SIRFSOC_PWRC_TRIGGER_EN);
#define X_ON_KEY_B (1 << 0)
	sirfsoc_rtc_iobrg_writel(pwr_trigger_en_reg | X_ON_KEY_B,
		sirfsoc_pwrc_base + SIRFSOC_PWRC_TRIGGER_EN);
}

static void sirfsoc_set_sleep_mode(u32 mode)
{
	u32 sleep_mode = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
		SIRFSOC_PWRC_PDN_CTRL);
	sleep_mode &= ~(SIRFSOC_SLEEP_MODE_MASK << 1);
	sleep_mode |= mode << 1;
	sirfsoc_rtc_iobrg_writel(sleep_mode, sirfsoc_pwrc_base +
		SIRFSOC_PWRC_PDN_CTRL);
}

static int sirfsoc_pre_suspend_power_off(void)
{
	u32 wakeup_entry = virt_to_phys(cpu_resume);

	sirfsoc_rtc_iobrg_writel(wakeup_entry, sirfsoc_pwrc_base +
		SIRFSOC_PWRC_SCRATCH_PAD1);

	sirfsoc_set_wakeup_source();

	sirfsoc_set_sleep_mode(SIRFSOC_DEEP_SLEEP_MODE);

	return 0;
}

static int sirfsoc_pm_enter(suspend_state_t state)
{
	switch (state) {
	case PM_SUSPEND_MEM:
		sirfsoc_pre_suspend_power_off();

		outer_flush_all();
		outer_disable();
		/* go zzz */
		cpu_suspend(0, sirfsoc_finish_suspend);
		outer_resume();
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static const struct platform_suspend_ops sirfsoc_pm_ops = {
	.enter = sirfsoc_pm_enter,
	.valid = suspend_valid_only_mem,
};

int __init sirfsoc_pm_init(void)
{
	suspend_set_ops(&sirfsoc_pm_ops);
	return 0;
}

static const struct of_device_id pwrc_ids[] = {
	{ .compatible = "sirf,prima2-pwrc" },
	{}
};

static int __init sirfsoc_of_pwrc_init(void)
{
	struct device_node *np;

	np = of_find_matching_node(NULL, pwrc_ids);
	if (!np) {
		pr_err("unable to find compatible sirf pwrc node in dtb\n");
		return -ENOENT;
	}

	/*
	 * pwrc behind rtciobrg is not located in memory space
	 * though the property is named reg. reg only means base
	 * offset for pwrc. then of_iomap is not suitable here.
	 */
	if (of_property_read_u32(np, "reg", &sirfsoc_pwrc_base))
		panic("unable to find base address of pwrc node in dtb\n");

	of_node_put(np);

	return 0;
}
postcore_initcall(sirfsoc_of_pwrc_init);

static const struct of_device_id memc_ids[] = {
	{ .compatible = "sirf,prima2-memc" },
	{}
};

static int sirfsoc_memc_probe(struct platform_device *op)
{
	struct device_node *np = op->dev.of_node;

	sirfsoc_memc_base = of_iomap(np, 0);
	if (!sirfsoc_memc_base)
		panic("unable to map memc registers\n");

	return 0;
}

static struct platform_driver sirfsoc_memc_driver = {
	.probe		= sirfsoc_memc_probe,
	.driver = {
		.name = "sirfsoc-memc",
		.owner = THIS_MODULE,
		.of_match_table	= memc_ids,
	},
};

static int __init sirfsoc_memc_init(void)
{
	return platform_driver_register(&sirfsoc_memc_driver);
}
postcore_initcall(sirfsoc_memc_init);
Commit	Line	Data
2558bd99 RY	1	/*
	2	* power management entry for CSR SiRFprimaII
	3	*
	4	* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
	5	*
	6	* Licensed under GPLv2 or later.
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/suspend.h>
	11	#include <linux/slab.h>
28b27d88	12	#include <linux/export.h>
2558bd99 RY	13	#include <linux/of.h>
	14	#include <linux/of_address.h>
	15	#include <linux/of_device.h>
	16	#include <linux/of_platform.h>
	17	#include <linux/io.h>
	18	#include <linux/rtc/sirfsoc_rtciobrg.h>
	19	#include <asm/suspend.h>
	20	#include <asm/hardware/cache-l2x0.h>
	21
	22	#include "pm.h"
	23
	24	/*
	25	* suspend asm codes will access these to make DRAM become self-refresh and
	26	* system sleep
	27	*/
	28	u32 sirfsoc_pwrc_base;
	29	void __iomem *sirfsoc_memc_base;
	30
	31	static void sirfsoc_set_wakeup_source(void)
	32	{
	33	u32 pwr_trigger_en_reg;
	34	pwr_trigger_en_reg = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
	35	SIRFSOC_PWRC_TRIGGER_EN);
	36	#define X_ON_KEY_B (1 << 0)
	37	sirfsoc_rtc_iobrg_writel(pwr_trigger_en_reg \| X_ON_KEY_B,
	38	sirfsoc_pwrc_base + SIRFSOC_PWRC_TRIGGER_EN);
	39	}
	40
	41	static void sirfsoc_set_sleep_mode(u32 mode)
	42	{
	43	u32 sleep_mode = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
	44	SIRFSOC_PWRC_PDN_CTRL);
	45	sleep_mode &= ~(SIRFSOC_SLEEP_MODE_MASK << 1);
	46	sleep_mode \|= mode << 1;
	47	sirfsoc_rtc_iobrg_writel(sleep_mode, sirfsoc_pwrc_base +
	48	SIRFSOC_PWRC_PDN_CTRL);
	49	}
	50
	51	static int sirfsoc_pre_suspend_power_off(void)
	52	{
	53	u32 wakeup_entry = virt_to_phys(cpu_resume);
	54
	55	sirfsoc_rtc_iobrg_writel(wakeup_entry, sirfsoc_pwrc_base +
	56	SIRFSOC_PWRC_SCRATCH_PAD1);
	57
	58	sirfsoc_set_wakeup_source();
	59
	60	sirfsoc_set_sleep_mode(SIRFSOC_DEEP_SLEEP_MODE);
	61
	62	return 0;
	63	}
	64
	65	static int sirfsoc_pm_enter(suspend_state_t state)
	66	{
	67	switch (state) {
	68	case PM_SUSPEND_MEM:
	69	sirfsoc_pre_suspend_power_off();
	70
	71	outer_flush_all();
	72	outer_disable();
	73	/* go zzz */
	74	cpu_suspend(0, sirfsoc_finish_suspend);
24469df4	75	outer_resume();
2558bd99 RY	76	break;
	77	default:
	78	return -EINVAL;
	79	}
	80	return 0;
	81	}
	82
	83	static const struct platform_suspend_ops sirfsoc_pm_ops = {
	84	.enter = sirfsoc_pm_enter,
	85	.valid = suspend_valid_only_mem,
	86	};
	87
a4b4674e	88	int __init sirfsoc_pm_init(void)
2558bd99 RY	89	{
	90	suspend_set_ops(&sirfsoc_pm_ops);
	91	return 0;
	92	}
2558bd99 RY	93
	94	static const struct of_device_id pwrc_ids[] = {
	95	{ .compatible = "sirf,prima2-pwrc" },
	96	{}
	97	};
	98
	99	static int __init sirfsoc_of_pwrc_init(void)
	100	{
	101	struct device_node *np;
	102
	103	np = of_find_matching_node(NULL, pwrc_ids);
7e5955db HZ	104	if (!np) {
	105	pr_err("unable to find compatible sirf pwrc node in dtb\n");
	106	return -ENOENT;
	107	}
2558bd99 RY	108
	109	/*
	110	* pwrc behind rtciobrg is not located in memory space
	111	* though the property is named reg. reg only means base
	112	* offset for pwrc. then of_iomap is not suitable here.
	113	*/
	114	if (of_property_read_u32(np, "reg", &sirfsoc_pwrc_base))
	115	panic("unable to find base address of pwrc node in dtb\n");
	116
	117	of_node_put(np);
	118
	119	return 0;
	120	}
	121	postcore_initcall(sirfsoc_of_pwrc_init);
	122
	123	static const struct of_device_id memc_ids[] = {
	124	{ .compatible = "sirf,prima2-memc" },
	125	{}
	126	};
	127
351a102d	128	static int sirfsoc_memc_probe(struct platform_device *op)
2558bd99 RY	129	{
	130	struct device_node *np = op->dev.of_node;
	131
	132	sirfsoc_memc_base = of_iomap(np, 0);
	133	if (!sirfsoc_memc_base)
	134	panic("unable to map memc registers\n");
	135
	136	return 0;
	137	}
	138
	139	static struct platform_driver sirfsoc_memc_driver = {
	140	.probe = sirfsoc_memc_probe,
	141	.driver = {
	142	.name = "sirfsoc-memc",
	143	.owner = THIS_MODULE,
	144	.of_match_table = memc_ids,
	145	},
	146	};
	147
	148	static int __init sirfsoc_memc_init(void)
	149	{
	150	return platform_driver_register(&sirfsoc_memc_driver);
	151	}
	152	postcore_initcall(sirfsoc_memc_init);