[deliverable/linux.git] / arch / arm / mach-rockchip / pm.c

/*
 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
 * Author: Tony Xie <tony.xie@rock-chips.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/suspend.h>
#include <linux/mfd/syscon.h>
#include <linux/regulator/machine.h>

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

#include "pm.h"

/* These enum are option of low power mode */
enum {
	ROCKCHIP_ARM_OFF_LOGIC_NORMAL = 0,
	ROCKCHIP_ARM_OFF_LOGIC_DEEP = 1,
};

struct rockchip_pm_data {
	const struct platform_suspend_ops *ops;
	int (*init)(struct device_node *np);
};

static void __iomem *rk3288_bootram_base;
static phys_addr_t rk3288_bootram_phy;

static struct regmap *pmu_regmap;
static struct regmap *sgrf_regmap;

static u32 rk3288_pmu_pwr_mode_con;
static u32 rk3288_sgrf_soc_con0;

static inline u32 rk3288_l2_config(void)
{
	u32 l2ctlr;

	asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (l2ctlr));
	return l2ctlr;
}

static void rk3288_config_bootdata(void)
{
	rkpm_bootdata_cpusp = rk3288_bootram_phy + (SZ_4K - 8);
	rkpm_bootdata_cpu_code = virt_to_phys(cpu_resume);

	rkpm_bootdata_l2ctlr_f  = 1;
	rkpm_bootdata_l2ctlr = rk3288_l2_config();
}

static void rk3288_slp_mode_set(int level)
{
	u32 mode_set, mode_set1;

	regmap_read(sgrf_regmap, RK3288_SGRF_SOC_CON0, &rk3288_sgrf_soc_con0);

	regmap_read(pmu_regmap, RK3288_PMU_PWRMODE_CON,
		    &rk3288_pmu_pwr_mode_con);

	/*
	 * SGRF_FAST_BOOT_EN - system to boot from FAST_BOOT_ADDR
	 * PCLK_WDT_GATE - disable WDT during suspend.
	 */
	regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
		     SGRF_PCLK_WDT_GATE | SGRF_FAST_BOOT_EN
		     | SGRF_PCLK_WDT_GATE_WRITE | SGRF_FAST_BOOT_EN_WRITE);

	/* booting address of resuming system is from this register value */
	regmap_write(sgrf_regmap, RK3288_SGRF_FAST_BOOT_ADDR,
		     rk3288_bootram_phy);

	regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1,
		     PMU_ARMINT_WAKEUP_EN);

	mode_set = BIT(PMU_GLOBAL_INT_DISABLE) | BIT(PMU_L2FLUSH_EN) |
		   BIT(PMU_SREF0_ENTER_EN) | BIT(PMU_SREF1_ENTER_EN) |
		   BIT(PMU_DDR0_GATING_EN) | BIT(PMU_DDR1_GATING_EN) |
		   BIT(PMU_PWR_MODE_EN) | BIT(PMU_CHIP_PD_EN) |
		   BIT(PMU_SCU_EN);

	mode_set1 = BIT(PMU_CLR_CORE) | BIT(PMU_CLR_CPUP);

	if (level == ROCKCHIP_ARM_OFF_LOGIC_DEEP) {
		/* arm off, logic deep sleep */
		mode_set |= BIT(PMU_BUS_PD_EN) |
			    BIT(PMU_DDR1IO_RET_EN) | BIT(PMU_DDR0IO_RET_EN) |
			    BIT(PMU_OSC_24M_DIS) | BIT(PMU_PMU_USE_LF) |
			    BIT(PMU_ALIVE_USE_LF) | BIT(PMU_PLL_PD_EN);

		mode_set1 |= BIT(PMU_CLR_ALIVE) | BIT(PMU_CLR_BUS) |
			     BIT(PMU_CLR_PERI) | BIT(PMU_CLR_DMA);
	} else {
		/*
		 * arm off, logic normal
		 * if pmu_clk_core_src_gate_en is not set,
		 * wakeup will be error
		 */
		mode_set |= BIT(PMU_CLK_CORE_SRC_GATE_EN);
	}

	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, mode_set);
	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON1, mode_set1);
}

static void rk3288_slp_mode_set_resume(void)
{
	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON,
		     rk3288_pmu_pwr_mode_con);

	regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
		     rk3288_sgrf_soc_con0 | SGRF_PCLK_WDT_GATE_WRITE
		     | SGRF_FAST_BOOT_EN_WRITE);
}

static int rockchip_lpmode_enter(unsigned long arg)
{
	flush_cache_all();

	cpu_do_idle();

	pr_err("%s: Failed to suspend\n", __func__);

	return 1;
}

static int rk3288_suspend_enter(suspend_state_t state)
{
	local_fiq_disable();

	rk3288_slp_mode_set(ROCKCHIP_ARM_OFF_LOGIC_NORMAL);

	cpu_suspend(0, rockchip_lpmode_enter);

	rk3288_slp_mode_set_resume();

	local_fiq_enable();

	return 0;
}

static int rk3288_suspend_prepare(void)
{
	return regulator_suspend_prepare(PM_SUSPEND_MEM);
}

static void rk3288_suspend_finish(void)
{
	if (regulator_suspend_finish())
		pr_err("%s: Suspend finish failed\n", __func__);
}

static int rk3288_suspend_init(struct device_node *np)
{
	struct device_node *sram_np;
	struct resource res;
	int ret;

	pmu_regmap = syscon_node_to_regmap(np);
	if (IS_ERR(pmu_regmap)) {
		pr_err("%s: could not find pmu regmap\n", __func__);
		return PTR_ERR(pmu_regmap);
	}

	sgrf_regmap = syscon_regmap_lookup_by_compatible(
				"rockchip,rk3288-sgrf");
	if (IS_ERR(sgrf_regmap)) {
		pr_err("%s: could not find sgrf regmap\n", __func__);
		return PTR_ERR(pmu_regmap);
	}

	sram_np = of_find_compatible_node(NULL, NULL,
					  "rockchip,rk3288-pmu-sram");
	if (!sram_np) {
		pr_err("%s: could not find bootram dt node\n", __func__);
		return -ENODEV;
	}

	rk3288_bootram_base = of_iomap(sram_np, 0);
	if (!rk3288_bootram_base) {
		pr_err("%s: could not map bootram base\n", __func__);
		return -ENOMEM;
	}

	ret = of_address_to_resource(sram_np, 0, &res);
	if (ret) {
		pr_err("%s: could not get bootram phy addr\n", __func__);
		return ret;
	}
	rk3288_bootram_phy = res.start;

	of_node_put(sram_np);

	rk3288_config_bootdata();

	/* copy resume code and data to bootsram */
	memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume,
	       rk3288_bootram_sz);

	regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT, OSC_STABL_CNT_THRESH);
	regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, PMU_STABL_CNT_THRESH);

	return 0;
}

static const struct platform_suspend_ops rk3288_suspend_ops = {
	.enter   = rk3288_suspend_enter,
	.valid   = suspend_valid_only_mem,
	.prepare = rk3288_suspend_prepare,
	.finish  = rk3288_suspend_finish,
};

static const struct rockchip_pm_data rk3288_pm_data __initconst = {
	.ops = &rk3288_suspend_ops,
	.init = rk3288_suspend_init,
};

static const struct of_device_id rockchip_pmu_of_device_ids[] __initconst = {
	{
		.compatible = "rockchip,rk3288-pmu",
		.data = &rk3288_pm_data,
	},
	{ /* sentinel */ },
};

void __init rockchip_suspend_init(void)
{
	const struct rockchip_pm_data *pm_data;
	const struct of_device_id *match;
	struct device_node *np;
	int ret;

	np = of_find_matching_node_and_match(NULL, rockchip_pmu_of_device_ids,
					     &match);
	if (!match) {
		pr_err("Failed to find PMU node\n");
		return;
	}
	pm_data = (struct rockchip_pm_data *) match->data;

	if (pm_data->init) {
		ret = pm_data->init(np);

		if (ret) {
			pr_err("%s: matches init error %d\n", __func__, ret);
			return;
		}
	}

	suspend_set_ops(pm_data->ops);
}
Commit	Line	Data
9c1ec8e1 CZ	1	/*
	2	* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
	3	* Author: Tony Xie <tony.xie@rock-chips.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	*/
	15
	16	#include <linux/init.h>
	17	#include <linux/io.h>
	18	#include <linux/kernel.h>
	19	#include <linux/of.h>
	20	#include <linux/of_address.h>
	21	#include <linux/regmap.h>
	22	#include <linux/suspend.h>
	23	#include <linux/mfd/syscon.h>
	24	#include <linux/regulator/machine.h>
	25
	26	#include <asm/cacheflush.h>
	27	#include <asm/tlbflush.h>
	28	#include <asm/suspend.h>
	29
	30	#include "pm.h"
	31
	32	/* These enum are option of low power mode */
	33	enum {
	34	ROCKCHIP_ARM_OFF_LOGIC_NORMAL = 0,
	35	ROCKCHIP_ARM_OFF_LOGIC_DEEP = 1,
	36	};
	37
	38	struct rockchip_pm_data {
	39	const struct platform_suspend_ops *ops;
	40	int (init)(struct device_node np);
	41	};
	42
	43	static void __iomem *rk3288_bootram_base;
	44	static phys_addr_t rk3288_bootram_phy;
	45
	46	static struct regmap *pmu_regmap;
	47	static struct regmap *sgrf_regmap;
	48
	49	static u32 rk3288_pmu_pwr_mode_con;
	50	static u32 rk3288_sgrf_soc_con0;
	51
	52	static inline u32 rk3288_l2_config(void)
	53	{
	54	u32 l2ctlr;
	55
	56	asm("mrc p15, 1, %0, c9, c0, 2" : "=r" (l2ctlr));
	57	return l2ctlr;
	58	}
	59
	60	static void rk3288_config_bootdata(void)
	61	{
	62	rkpm_bootdata_cpusp = rk3288_bootram_phy + (SZ_4K - 8);
	63	rkpm_bootdata_cpu_code = virt_to_phys(cpu_resume);
	64
65	rkpm_bootdata_l2ctlr_f = 1;
66	rkpm_bootdata_l2ctlr = rk3288_l2_config();
67	}
68
69	static void rk3288_slp_mode_set(int level)
70	{
71	u32 mode_set, mode_set1;
72
73	regmap_read(sgrf_regmap, RK3288_SGRF_SOC_CON0, &rk3288_sgrf_soc_con0);
74
75	regmap_read(pmu_regmap, RK3288_PMU_PWRMODE_CON,
76	&rk3288_pmu_pwr_mode_con);
77
a0307d18 CZ	78	/*
	79	* SGRF_FAST_BOOT_EN - system to boot from FAST_BOOT_ADDR
	80	* PCLK_WDT_GATE - disable WDT during suspend.
	81	*/
9c1ec8e1	82	regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
a0307d18 CZ	83	SGRF_PCLK_WDT_GATE \| SGRF_FAST_BOOT_EN
a0307d18 CZ	84	\| SGRF_PCLK_WDT_GATE_WRITE \| SGRF_FAST_BOOT_EN_WRITE);
9c1ec8e1 CZ	85
	86	/* booting address of resuming system is from this register value */
	87	regmap_write(sgrf_regmap, RK3288_SGRF_FAST_BOOT_ADDR,
	88	rk3288_bootram_phy);
	89
	90	regmap_write(pmu_regmap, RK3288_PMU_WAKEUP_CFG1,
	91	PMU_ARMINT_WAKEUP_EN);
	92
	93	mode_set = BIT(PMU_GLOBAL_INT_DISABLE) \| BIT(PMU_L2FLUSH_EN) \|
	94	BIT(PMU_SREF0_ENTER_EN) \| BIT(PMU_SREF1_ENTER_EN) \|
	95	BIT(PMU_DDR0_GATING_EN) \| BIT(PMU_DDR1_GATING_EN) \|
	96	BIT(PMU_PWR_MODE_EN) \| BIT(PMU_CHIP_PD_EN) \|
	97	BIT(PMU_SCU_EN);
	98
	99	mode_set1 = BIT(PMU_CLR_CORE) \| BIT(PMU_CLR_CPUP);
	100
	101	if (level == ROCKCHIP_ARM_OFF_LOGIC_DEEP) {
	102	/* arm off, logic deep sleep */
	103	mode_set \|= BIT(PMU_BUS_PD_EN) \|
	104	BIT(PMU_DDR1IO_RET_EN) \| BIT(PMU_DDR0IO_RET_EN) \|
	105	BIT(PMU_OSC_24M_DIS) \| BIT(PMU_PMU_USE_LF) \|
	106	BIT(PMU_ALIVE_USE_LF) \| BIT(PMU_PLL_PD_EN);
	107
	108	mode_set1 \|= BIT(PMU_CLR_ALIVE) \| BIT(PMU_CLR_BUS) \|
	109	BIT(PMU_CLR_PERI) \| BIT(PMU_CLR_DMA);
	110	} else {
	111	/*
	112	* arm off, logic normal
	113	* if pmu_clk_core_src_gate_en is not set,
	114	* wakeup will be error
	115	*/
	116	mode_set \|= BIT(PMU_CLK_CORE_SRC_GATE_EN);
	117	}
	118
	119	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON, mode_set);
	120	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON1, mode_set1);
	121	}
	122
	123	static void rk3288_slp_mode_set_resume(void)
	124	{
	125	regmap_write(pmu_regmap, RK3288_PMU_PWRMODE_CON,
	126	rk3288_pmu_pwr_mode_con);
	127
	128	regmap_write(sgrf_regmap, RK3288_SGRF_SOC_CON0,
a0307d18 CZ	129	rk3288_sgrf_soc_con0 \| SGRF_PCLK_WDT_GATE_WRITE
a0307d18 CZ	130	\| SGRF_FAST_BOOT_EN_WRITE);
9c1ec8e1 CZ	131	}
	132
	133	static int rockchip_lpmode_enter(unsigned long arg)
	134	{
	135	flush_cache_all();
	136
	137	cpu_do_idle();
	138
	139	pr_err("%s: Failed to suspend\n", __func__);
	140
	141	return 1;
	142	}
	143
	144	static int rk3288_suspend_enter(suspend_state_t state)
	145	{
	146	local_fiq_disable();
	147
	148	rk3288_slp_mode_set(ROCKCHIP_ARM_OFF_LOGIC_NORMAL);
	149
	150	cpu_suspend(0, rockchip_lpmode_enter);
	151
	152	rk3288_slp_mode_set_resume();
	153
	154	local_fiq_enable();
	155
	156	return 0;
	157	}
	158
	159	static int rk3288_suspend_prepare(void)
	160	{
	161	return regulator_suspend_prepare(PM_SUSPEND_MEM);
	162	}
	163
	164	static void rk3288_suspend_finish(void)
	165	{
	166	if (regulator_suspend_finish())
	167	pr_err("%s: Suspend finish failed\n", __func__);
	168	}
	169
	170	static int rk3288_suspend_init(struct device_node *np)
	171	{
	172	struct device_node *sram_np;
	173	struct resource res;
	174	int ret;
	175
	176	pmu_regmap = syscon_node_to_regmap(np);
	177	if (IS_ERR(pmu_regmap)) {
	178	pr_err("%s: could not find pmu regmap\n", __func__);
	179	return PTR_ERR(pmu_regmap);
	180	}
	181
	182	sgrf_regmap = syscon_regmap_lookup_by_compatible(
	183	"rockchip,rk3288-sgrf");
	184	if (IS_ERR(sgrf_regmap)) {
	185	pr_err("%s: could not find sgrf regmap\n", __func__);
	186	return PTR_ERR(pmu_regmap);
	187	}
	188
	189	sram_np = of_find_compatible_node(NULL, NULL,
	190	"rockchip,rk3288-pmu-sram");
	191	if (!sram_np) {
	192	pr_err("%s: could not find bootram dt node\n", __func__);
	193	return -ENODEV;
	194	}
195
196	rk3288_bootram_base = of_iomap(sram_np, 0);
197	if (!rk3288_bootram_base) {
198	pr_err("%s: could not map bootram base\n", __func__);
199	return -ENOMEM;
200	}
201
202	ret = of_address_to_resource(sram_np, 0, &res);
203	if (ret) {
204	pr_err("%s: could not get bootram phy addr\n", __func__);
205	return ret;
206	}
207	rk3288_bootram_phy = res.start;
208
209	of_node_put(sram_np);
210
211	rk3288_config_bootdata();
212
213	/* copy resume code and data to bootsram */
214	memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume,
215	rk3288_bootram_sz);
216
aefc7c75 CZ	217	regmap_write(pmu_regmap, RK3288_PMU_OSC_CNT, OSC_STABL_CNT_THRESH);
	218	regmap_write(pmu_regmap, RK3288_PMU_STABL_CNT, PMU_STABL_CNT_THRESH);
	219
9c1ec8e1 CZ	220	return 0;
	221	}
	222
	223	static const struct platform_suspend_ops rk3288_suspend_ops = {
	224	.enter = rk3288_suspend_enter,
	225	.valid = suspend_valid_only_mem,
	226	.prepare = rk3288_suspend_prepare,
	227	.finish = rk3288_suspend_finish,
	228	};
	229
	230	static const struct rockchip_pm_data rk3288_pm_data __initconst = {
	231	.ops = &rk3288_suspend_ops,
	232	.init = rk3288_suspend_init,
	233	};
	234
	235	static const struct of_device_id rockchip_pmu_of_device_ids[] __initconst = {
	236	{
	237	.compatible = "rockchip,rk3288-pmu",
	238	.data = &rk3288_pm_data,
	239	},
	240	{ /* sentinel */ },
	241	};
	242
	243	void __init rockchip_suspend_init(void)
	244	{
	245	const struct rockchip_pm_data *pm_data;
	246	const struct of_device_id *match;
	247	struct device_node *np;
	248	int ret;
	249
	250	np = of_find_matching_node_and_match(NULL, rockchip_pmu_of_device_ids,
	251	&match);
	252	if (!match) {
	253	pr_err("Failed to find PMU node\n");
	254	return;
	255	}
	256	pm_data = (struct rockchip_pm_data *) match->data;
	257
	258	if (pm_data->init) {
	259	ret = pm_data->init(np);
	260
	261	if (ret) {
	262	pr_err("%s: matches init error %d\n", __func__, ret);
	263	return;
	264	}
	265	}
	266
	267	suspend_set_ops(pm_data->ops);
	268	}