[linux-2.6-block.git] / drivers / soc / qcom / spm.c

/*
 * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
 * Copyright (c) 2014,2015, Linaro Ltd.
 *
 * SAW power controller driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that 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/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/qcom_scm.h>

#include <asm/cpuidle.h>
#include <asm/proc-fns.h>
#include <asm/suspend.h>

#define MAX_PMIC_DATA		2
#define MAX_SEQ_DATA		64
#define SPM_CTL_INDEX		0x7f
#define SPM_CTL_INDEX_SHIFT	4
#define SPM_CTL_EN		BIT(0)

enum pm_sleep_mode {
	PM_SLEEP_MODE_STBY,
	PM_SLEEP_MODE_RET,
	PM_SLEEP_MODE_SPC,
	PM_SLEEP_MODE_PC,
	PM_SLEEP_MODE_NR,
};

enum spm_reg {
	SPM_REG_CFG,
	SPM_REG_SPM_CTL,
	SPM_REG_DLY,
	SPM_REG_PMIC_DLY,
	SPM_REG_PMIC_DATA_0,
	SPM_REG_PMIC_DATA_1,
	SPM_REG_VCTL,
	SPM_REG_SEQ_ENTRY,
	SPM_REG_SPM_STS,
	SPM_REG_PMIC_STS,
	SPM_REG_NR,
};

struct spm_reg_data {
	const u8 *reg_offset;
	u32 spm_cfg;
	u32 spm_dly;
	u32 pmic_dly;
	u32 pmic_data[MAX_PMIC_DATA];
	u8 seq[MAX_SEQ_DATA];
	u8 start_index[PM_SLEEP_MODE_NR];
};

struct spm_driver_data {
	void __iomem *reg_base;
	const struct spm_reg_data *reg_data;
};

static const u8 spm_reg_offset_v2_1[SPM_REG_NR] = {
	[SPM_REG_CFG]		= 0x08,
	[SPM_REG_SPM_CTL]	= 0x30,
	[SPM_REG_DLY]		= 0x34,
	[SPM_REG_SEQ_ENTRY]	= 0x80,
};

/* SPM register data for 8974, 8084 */
static const struct spm_reg_data spm_reg_8974_8084_cpu  = {
	.reg_offset = spm_reg_offset_v2_1,
	.spm_cfg = 0x1,
	.spm_dly = 0x3C102800,
	.seq = { 0x03, 0x0B, 0x0F, 0x00, 0x20, 0x80, 0x10, 0xE8, 0x5B, 0x03,
		0x3B, 0xE8, 0x5B, 0x82, 0x10, 0x0B, 0x30, 0x06, 0x26, 0x30,
		0x0F },
	.start_index[PM_SLEEP_MODE_STBY] = 0,
	.start_index[PM_SLEEP_MODE_SPC] = 3,
};

static const u8 spm_reg_offset_v1_1[SPM_REG_NR] = {
	[SPM_REG_CFG]		= 0x08,
	[SPM_REG_SPM_CTL]	= 0x20,
	[SPM_REG_PMIC_DLY]	= 0x24,
	[SPM_REG_PMIC_DATA_0]	= 0x28,
	[SPM_REG_PMIC_DATA_1]	= 0x2C,
	[SPM_REG_SEQ_ENTRY]	= 0x80,
};

/* SPM register data for 8064 */
static const struct spm_reg_data spm_reg_8064_cpu = {
	.reg_offset = spm_reg_offset_v1_1,
	.spm_cfg = 0x1F,
	.pmic_dly = 0x02020004,
	.pmic_data[0] = 0x0084009C,
	.pmic_data[1] = 0x00A4001C,
	.seq = { 0x03, 0x0F, 0x00, 0x24, 0x54, 0x10, 0x09, 0x03, 0x01,
		0x10, 0x54, 0x30, 0x0C, 0x24, 0x30, 0x0F },
	.start_index[PM_SLEEP_MODE_STBY] = 0,
	.start_index[PM_SLEEP_MODE_SPC] = 2,
};

static DEFINE_PER_CPU(struct spm_driver_data *, cpu_spm_drv);

typedef int (*idle_fn)(void);
static DEFINE_PER_CPU(idle_fn*, qcom_idle_ops);

static inline void spm_register_write(struct spm_driver_data *drv,
					enum spm_reg reg, u32 val)
{
	if (drv->reg_data->reg_offset[reg])
		writel_relaxed(val, drv->reg_base +
				drv->reg_data->reg_offset[reg]);
}

/* Ensure a guaranteed write, before return */
static inline void spm_register_write_sync(struct spm_driver_data *drv,
					enum spm_reg reg, u32 val)
{
	u32 ret;

	if (!drv->reg_data->reg_offset[reg])
		return;

	do {
		writel_relaxed(val, drv->reg_base +
				drv->reg_data->reg_offset[reg]);
		ret = readl_relaxed(drv->reg_base +
				drv->reg_data->reg_offset[reg]);
		if (ret == val)
			break;
		cpu_relax();
	} while (1);
}

static inline u32 spm_register_read(struct spm_driver_data *drv,
					enum spm_reg reg)
{
	return readl_relaxed(drv->reg_base + drv->reg_data->reg_offset[reg]);
}

static void spm_set_low_power_mode(struct spm_driver_data *drv,
					enum pm_sleep_mode mode)
{
	u32 start_index;
	u32 ctl_val;

	start_index = drv->reg_data->start_index[mode];

	ctl_val = spm_register_read(drv, SPM_REG_SPM_CTL);
	ctl_val &= ~(SPM_CTL_INDEX << SPM_CTL_INDEX_SHIFT);
	ctl_val |= start_index << SPM_CTL_INDEX_SHIFT;
	ctl_val |= SPM_CTL_EN;
	spm_register_write_sync(drv, SPM_REG_SPM_CTL, ctl_val);
}

static int qcom_pm_collapse(unsigned long int unused)
{
	qcom_scm_cpu_power_down(QCOM_SCM_CPU_PWR_DOWN_L2_ON);

	/*
	 * Returns here only if there was a pending interrupt and we did not
	 * power down as a result.
	 */
	return -1;
}

static int qcom_cpu_spc(void)
{
	int ret;
	struct spm_driver_data *drv = __this_cpu_read(cpu_spm_drv);

	spm_set_low_power_mode(drv, PM_SLEEP_MODE_SPC);
	ret = cpu_suspend(0, qcom_pm_collapse);
	/*
	 * ARM common code executes WFI without calling into our driver and
	 * if the SPM mode is not reset, then we may accidently power down the
	 * cpu when we intended only to gate the cpu clock.
	 * Ensure the state is set to standby before returning.
	 */
	spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);

	return ret;
}

static int qcom_idle_enter(unsigned long index)
{
	return __this_cpu_read(qcom_idle_ops)[index]();
}

static const struct of_device_id qcom_idle_state_match[] __initconst = {
	{ .compatible = "qcom,idle-state-spc", .data = qcom_cpu_spc },
	{ },
};

static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
{
	const struct of_device_id *match_id;
	struct device_node *state_node;
	int i;
	int state_count = 1;
	idle_fn idle_fns[CPUIDLE_STATE_MAX];
	idle_fn *fns;
	cpumask_t mask;
	bool use_scm_power_down = false;

	if (!qcom_scm_is_available())
		return -EPROBE_DEFER;

	for (i = 0; ; i++) {
		state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
		if (!state_node)
			break;

		if (!of_device_is_available(state_node))
			continue;

		if (i == CPUIDLE_STATE_MAX) {
			pr_warn("%s: cpuidle states reached max possible\n",
					__func__);
			break;
		}

		match_id = of_match_node(qcom_idle_state_match, state_node);
		if (!match_id)
			return -ENODEV;

		idle_fns[state_count] = match_id->data;

		/* Check if any of the states allow power down */
		if (match_id->data == qcom_cpu_spc)
			use_scm_power_down = true;

		state_count++;
	}

	if (state_count == 1)
		goto check_spm;

	fns = devm_kcalloc(get_cpu_device(cpu), state_count, sizeof(*fns),
			GFP_KERNEL);
	if (!fns)
		return -ENOMEM;

	for (i = 1; i < state_count; i++)
		fns[i] = idle_fns[i];

	if (use_scm_power_down) {
		/* We have atleast one power down mode */
		cpumask_clear(&mask);
		cpumask_set_cpu(cpu, &mask);
		qcom_scm_set_warm_boot_addr(cpu_resume_arm, &mask);
	}

	per_cpu(qcom_idle_ops, cpu) = fns;

	/*
	 * SPM probe for the cpu should have happened by now, if the
	 * SPM device does not exist, return -ENXIO to indicate that the
	 * cpu does not support idle states.
	 */
check_spm:
	return per_cpu(cpu_spm_drv, cpu) ? 0 : -ENXIO;
}

static const struct cpuidle_ops qcom_cpuidle_ops __initconst = {
	.suspend = qcom_idle_enter,
	.init = qcom_cpuidle_init,
};

CPUIDLE_METHOD_OF_DECLARE(qcom_idle_v1, "qcom,kpss-acc-v1", &qcom_cpuidle_ops);
CPUIDLE_METHOD_OF_DECLARE(qcom_idle_v2, "qcom,kpss-acc-v2", &qcom_cpuidle_ops);

static struct spm_driver_data *spm_get_drv(struct platform_device *pdev,
		int *spm_cpu)
{
	struct spm_driver_data *drv = NULL;
	struct device_node *cpu_node, *saw_node;
	int cpu;
	bool found = 0;

	for_each_possible_cpu(cpu) {
		cpu_node = of_cpu_device_node_get(cpu);
		if (!cpu_node)
			continue;
		saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
		found = (saw_node == pdev->dev.of_node);
		of_node_put(saw_node);
		of_node_put(cpu_node);
		if (found)
			break;
	}

	if (found) {
		drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
		if (drv)
			*spm_cpu = cpu;
	}

	return drv;
}

static const struct of_device_id spm_match_table[] = {
	{ .compatible = "qcom,msm8974-saw2-v2.1-cpu",
	  .data = &spm_reg_8974_8084_cpu },
	{ .compatible = "qcom,apq8084-saw2-v2.1-cpu",
	  .data = &spm_reg_8974_8084_cpu },
	{ .compatible = "qcom,apq8064-saw2-v1.1-cpu",
	  .data = &spm_reg_8064_cpu },
	{ },
};

static int spm_dev_probe(struct platform_device *pdev)
{
	struct spm_driver_data *drv;
	struct resource *res;
	const struct of_device_id *match_id;
	void __iomem *addr;
	int cpu;

	drv = spm_get_drv(pdev, &cpu);
	if (!drv)
		return -EINVAL;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	drv->reg_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(drv->reg_base))
		return PTR_ERR(drv->reg_base);

	match_id = of_match_node(spm_match_table, pdev->dev.of_node);
	if (!match_id)
		return -ENODEV;

	drv->reg_data = match_id->data;

	/* Write the SPM sequences first.. */
	addr = drv->reg_base + drv->reg_data->reg_offset[SPM_REG_SEQ_ENTRY];
	__iowrite32_copy(addr, drv->reg_data->seq,
			ARRAY_SIZE(drv->reg_data->seq) / 4);

	/*
	 * ..and then the control registers.
	 * On some SoC if the control registers are written first and if the
	 * CPU was held in reset, the reset signal could trigger the SPM state
	 * machine, before the sequences are completely written.
	 */
	spm_register_write(drv, SPM_REG_CFG, drv->reg_data->spm_cfg);
	spm_register_write(drv, SPM_REG_DLY, drv->reg_data->spm_dly);
	spm_register_write(drv, SPM_REG_PMIC_DLY, drv->reg_data->pmic_dly);
	spm_register_write(drv, SPM_REG_PMIC_DATA_0,
				drv->reg_data->pmic_data[0]);
	spm_register_write(drv, SPM_REG_PMIC_DATA_1,
				drv->reg_data->pmic_data[1]);

	/* Set up Standby as the default low power mode */
	spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);

	per_cpu(cpu_spm_drv, cpu) = drv;

	return 0;
}

static struct platform_driver spm_driver = {
	.probe = spm_dev_probe,
	.driver = {
		.name = "saw",
		.of_match_table = spm_match_table,
	},
};

builtin_platform_driver(spm_driver);
Commit	Line	Data
7ce75bb2 LI	1	/*
	2	* Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
	3	* Copyright (c) 2014,2015, Linaro Ltd.
	4	*
3b904b04 LI	5	* SAW power controller driver
3b904b04 LI	6	*
7ce75bb2 LI	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 and
	9	* only version 2 as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16
7ce75bb2 LI	17	#include <linux/kernel.h>
	18	#include <linux/init.h>
	19	#include <linux/io.h>
	20	#include <linux/slab.h>
	21	#include <linux/of.h>
	22	#include <linux/of_address.h>
	23	#include <linux/of_device.h>
	24	#include <linux/err.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/cpuidle.h>
	27	#include <linux/cpu_pm.h>
	28	#include <linux/qcom_scm.h>
	29
	30	#include <asm/cpuidle.h>
	31	#include <asm/proc-fns.h>
	32	#include <asm/suspend.h>
	33
	34	#define MAX_PMIC_DATA 2
	35	#define MAX_SEQ_DATA 64
	36	#define SPM_CTL_INDEX 0x7f
	37	#define SPM_CTL_INDEX_SHIFT 4
	38	#define SPM_CTL_EN BIT(0)
	39
	40	enum pm_sleep_mode {
	41	PM_SLEEP_MODE_STBY,
	42	PM_SLEEP_MODE_RET,
	43	PM_SLEEP_MODE_SPC,
	44	PM_SLEEP_MODE_PC,
	45	PM_SLEEP_MODE_NR,
	46	};
	47
	48	enum spm_reg {
	49	SPM_REG_CFG,
	50	SPM_REG_SPM_CTL,
	51	SPM_REG_DLY,
	52	SPM_REG_PMIC_DLY,
	53	SPM_REG_PMIC_DATA_0,
	54	SPM_REG_PMIC_DATA_1,
	55	SPM_REG_VCTL,
	56	SPM_REG_SEQ_ENTRY,
	57	SPM_REG_SPM_STS,
	58	SPM_REG_PMIC_STS,
	59	SPM_REG_NR,
	60	};
	61
	62	struct spm_reg_data {
	63	const u8 *reg_offset;
	64	u32 spm_cfg;
	65	u32 spm_dly;
	66	u32 pmic_dly;
	67	u32 pmic_data[MAX_PMIC_DATA];
	68	u8 seq[MAX_SEQ_DATA];
	69	u8 start_index[PM_SLEEP_MODE_NR];
	70	};
	71
	72	struct spm_driver_data {
	73	void __iomem *reg_base;
	74	const struct spm_reg_data *reg_data;
	75	};
	76
	77	static const u8 spm_reg_offset_v2_1[SPM_REG_NR] = {
	78	[SPM_REG_CFG] = 0x08,
	79	[SPM_REG_SPM_CTL] = 0x30,
	80	[SPM_REG_DLY] = 0x34,
81	[SPM_REG_SEQ_ENTRY] = 0x80,
82	};
83
84	/* SPM register data for 8974, 8084 */
85	static const struct spm_reg_data spm_reg_8974_8084_cpu = {
86	.reg_offset = spm_reg_offset_v2_1,
87	.spm_cfg = 0x1,
88	.spm_dly = 0x3C102800,
89	.seq = { 0x03, 0x0B, 0x0F, 0x00, 0x20, 0x80, 0x10, 0xE8, 0x5B, 0x03,
90	0x3B, 0xE8, 0x5B, 0x82, 0x10, 0x0B, 0x30, 0x06, 0x26, 0x30,
91	0x0F },
92	.start_index[PM_SLEEP_MODE_STBY] = 0,
93	.start_index[PM_SLEEP_MODE_SPC] = 3,
94	};
95
96	static const u8 spm_reg_offset_v1_1[SPM_REG_NR] = {
97	[SPM_REG_CFG] = 0x08,
98	[SPM_REG_SPM_CTL] = 0x20,
99	[SPM_REG_PMIC_DLY] = 0x24,
100	[SPM_REG_PMIC_DATA_0] = 0x28,
101	[SPM_REG_PMIC_DATA_1] = 0x2C,
102	[SPM_REG_SEQ_ENTRY] = 0x80,
103	};
104
105	/* SPM register data for 8064 */
106	static const struct spm_reg_data spm_reg_8064_cpu = {
107	.reg_offset = spm_reg_offset_v1_1,
108	.spm_cfg = 0x1F,
109	.pmic_dly = 0x02020004,
110	.pmic_data[0] = 0x0084009C,
111	.pmic_data[1] = 0x00A4001C,
112	.seq = { 0x03, 0x0F, 0x00, 0x24, 0x54, 0x10, 0x09, 0x03, 0x01,
113	0x10, 0x54, 0x30, 0x0C, 0x24, 0x30, 0x0F },
114	.start_index[PM_SLEEP_MODE_STBY] = 0,
115	.start_index[PM_SLEEP_MODE_SPC] = 2,
116	};
117
118	static DEFINE_PER_CPU(struct spm_driver_data *, cpu_spm_drv);
119
f6419f24	120	typedef int (*idle_fn)(void);
7ce75bb2 LI	121	static DEFINE_PER_CPU(idle_fn*, qcom_idle_ops);
	122
	123	static inline void spm_register_write(struct spm_driver_data *drv,
	124	enum spm_reg reg, u32 val)
	125	{
	126	if (drv->reg_data->reg_offset[reg])
	127	writel_relaxed(val, drv->reg_base +
	128	drv->reg_data->reg_offset[reg]);
	129	}
	130
	131	/* Ensure a guaranteed write, before return */
	132	static inline void spm_register_write_sync(struct spm_driver_data *drv,
	133	enum spm_reg reg, u32 val)
	134	{
	135	u32 ret;
	136
	137	if (!drv->reg_data->reg_offset[reg])
	138	return;
	139
	140	do {
	141	writel_relaxed(val, drv->reg_base +
	142	drv->reg_data->reg_offset[reg]);
	143	ret = readl_relaxed(drv->reg_base +
	144	drv->reg_data->reg_offset[reg]);
	145	if (ret == val)
	146	break;
	147	cpu_relax();
	148	} while (1);
	149	}
	150
	151	static inline u32 spm_register_read(struct spm_driver_data *drv,
	152	enum spm_reg reg)
	153	{
	154	return readl_relaxed(drv->reg_base + drv->reg_data->reg_offset[reg]);
	155	}
	156
	157	static void spm_set_low_power_mode(struct spm_driver_data *drv,
	158	enum pm_sleep_mode mode)
	159	{
	160	u32 start_index;
	161	u32 ctl_val;
	162
	163	start_index = drv->reg_data->start_index[mode];
	164
	165	ctl_val = spm_register_read(drv, SPM_REG_SPM_CTL);
	166	ctl_val &= ~(SPM_CTL_INDEX << SPM_CTL_INDEX_SHIFT);
	167	ctl_val \|= start_index << SPM_CTL_INDEX_SHIFT;
	168	ctl_val \|= SPM_CTL_EN;
	169	spm_register_write_sync(drv, SPM_REG_SPM_CTL, ctl_val);
	170	}
	171
	172	static int qcom_pm_collapse(unsigned long int unused)
	173	{
	174	qcom_scm_cpu_power_down(QCOM_SCM_CPU_PWR_DOWN_L2_ON);
	175
	176	/*
	177	* Returns here only if there was a pending interrupt and we did not
	178	* power down as a result.
	179	*/
	180	return -1;
	181	}
	182
f6419f24	183	static int qcom_cpu_spc(void)
7ce75bb2 LI	184	{
7ce75bb2 LI	185	int ret;
f6419f24	186	struct spm_driver_data *drv = __this_cpu_read(cpu_spm_drv);
7ce75bb2 LI	187
	188	spm_set_low_power_mode(drv, PM_SLEEP_MODE_SPC);
	189	ret = cpu_suspend(0, qcom_pm_collapse);
	190	/*
	191	* ARM common code executes WFI without calling into our driver and
	192	* if the SPM mode is not reset, then we may accidently power down the
	193	* cpu when we intended only to gate the cpu clock.
	194	* Ensure the state is set to standby before returning.
	195	*/
	196	spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);
	197
	198	return ret;
	199	}
	200
f6419f24	201	static int qcom_idle_enter(unsigned long index)
7ce75bb2	202	{
f6419f24	203	return __this_cpu_read(qcom_idle_ops)[index]();
7ce75bb2 LI	204	}
	205
	206	static const struct of_device_id qcom_idle_state_match[] __initconst = {
	207	{ .compatible = "qcom,idle-state-spc", .data = qcom_cpu_spc },
	208	{ },
	209	};
	210
	211	static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
	212	{
	213	const struct of_device_id *match_id;
	214	struct device_node *state_node;
	215	int i;
	216	int state_count = 1;
	217	idle_fn idle_fns[CPUIDLE_STATE_MAX];
	218	idle_fn *fns;
	219	cpumask_t mask;
	220	bool use_scm_power_down = false;
	221
61a3bd10 FF	222	if (!qcom_scm_is_available())
	223	return -EPROBE_DEFER;
	224
7ce75bb2 LI	225	for (i = 0; ; i++) {
	226	state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
	227	if (!state_node)
	228	break;
	229
	230	if (!of_device_is_available(state_node))
	231	continue;
	232
	233	if (i == CPUIDLE_STATE_MAX) {
	234	pr_warn("%s: cpuidle states reached max possible\n",
	235	__func__);
	236	break;
	237	}
	238
	239	match_id = of_match_node(qcom_idle_state_match, state_node);
	240	if (!match_id)
	241	return -ENODEV;
	242
	243	idle_fns[state_count] = match_id->data;
	244
	245	/* Check if any of the states allow power down */
	246	if (match_id->data == qcom_cpu_spc)
	247	use_scm_power_down = true;
	248
	249	state_count++;
	250	}
	251
	252	if (state_count == 1)
	253	goto check_spm;
	254
	255	fns = devm_kcalloc(get_cpu_device(cpu), state_count, sizeof(*fns),
	256	GFP_KERNEL);
	257	if (!fns)
	258	return -ENOMEM;
	259
	260	for (i = 1; i < state_count; i++)
	261	fns[i] = idle_fns[i];
	262
	263	if (use_scm_power_down) {
	264	/* We have atleast one power down mode */
	265	cpumask_clear(&mask);
	266	cpumask_set_cpu(cpu, &mask);
498f09bc	267	qcom_scm_set_warm_boot_addr(cpu_resume_arm, &mask);
7ce75bb2 LI	268	}
	269
	270	per_cpu(qcom_idle_ops, cpu) = fns;
	271
	272	/*
	273	* SPM probe for the cpu should have happened by now, if the
	274	* SPM device does not exist, return -ENXIO to indicate that the
	275	* cpu does not support idle states.
	276	*/
	277	check_spm:
	278	return per_cpu(cpu_spm_drv, cpu) ? 0 : -ENXIO;
	279	}
	280
1e712d9b	281	static const struct cpuidle_ops qcom_cpuidle_ops __initconst = {
7ce75bb2 LI	282	.suspend = qcom_idle_enter,
	283	.init = qcom_cpuidle_init,
	284	};
	285
	286	CPUIDLE_METHOD_OF_DECLARE(qcom_idle_v1, "qcom,kpss-acc-v1", &qcom_cpuidle_ops);
	287	CPUIDLE_METHOD_OF_DECLARE(qcom_idle_v2, "qcom,kpss-acc-v2", &qcom_cpuidle_ops);
	288
	289	static struct spm_driver_data spm_get_drv(struct platform_device pdev,
	290	int *spm_cpu)
	291	{
	292	struct spm_driver_data *drv = NULL;
	293	struct device_node cpu_node, saw_node;
	294	int cpu;
00affcac	295	bool found = 0;
7ce75bb2 LI	296
	297	for_each_possible_cpu(cpu) {
	298	cpu_node = of_cpu_device_node_get(cpu);
	299	if (!cpu_node)
	300	continue;
	301	saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
	302	found = (saw_node == pdev->dev.of_node);
	303	of_node_put(saw_node);
	304	of_node_put(cpu_node);
	305	if (found)
	306	break;
	307	}
	308
	309	if (found) {
	310	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
	311	if (drv)
	312	*spm_cpu = cpu;
	313	}
	314
	315	return drv;
	316	}
	317
	318	static const struct of_device_id spm_match_table[] = {
	319	{ .compatible = "qcom,msm8974-saw2-v2.1-cpu",
	320	.data = &spm_reg_8974_8084_cpu },
	321	{ .compatible = "qcom,apq8084-saw2-v2.1-cpu",
	322	.data = &spm_reg_8974_8084_cpu },
	323	{ .compatible = "qcom,apq8064-saw2-v1.1-cpu",
	324	.data = &spm_reg_8064_cpu },
	325	{ },
	326	};
	327
	328	static int spm_dev_probe(struct platform_device *pdev)
	329	{
	330	struct spm_driver_data *drv;
	331	struct resource *res;
	332	const struct of_device_id *match_id;
	333	void __iomem *addr;
	334	int cpu;
	335
	336	drv = spm_get_drv(pdev, &cpu);
	337	if (!drv)
	338	return -EINVAL;
	339
	340	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	341	drv->reg_base = devm_ioremap_resource(&pdev->dev, res);
	342	if (IS_ERR(drv->reg_base))
	343	return PTR_ERR(drv->reg_base);
	344
	345	match_id = of_match_node(spm_match_table, pdev->dev.of_node);
	346	if (!match_id)
	347	return -ENODEV;
	348
	349	drv->reg_data = match_id->data;
	350
	351	/* Write the SPM sequences first.. */
	352	addr = drv->reg_base + drv->reg_data->reg_offset[SPM_REG_SEQ_ENTRY];
	353	__iowrite32_copy(addr, drv->reg_data->seq,
	354	ARRAY_SIZE(drv->reg_data->seq) / 4);
	355
	356	/*
	357	* ..and then the control registers.
	358	* On some SoC if the control registers are written first and if the
	359	* CPU was held in reset, the reset signal could trigger the SPM state
360	* machine, before the sequences are completely written.
361	*/
362	spm_register_write(drv, SPM_REG_CFG, drv->reg_data->spm_cfg);
363	spm_register_write(drv, SPM_REG_DLY, drv->reg_data->spm_dly);
364	spm_register_write(drv, SPM_REG_PMIC_DLY, drv->reg_data->pmic_dly);
365	spm_register_write(drv, SPM_REG_PMIC_DATA_0,
366	drv->reg_data->pmic_data[0]);
367	spm_register_write(drv, SPM_REG_PMIC_DATA_1,
368	drv->reg_data->pmic_data[1]);
369
370	/* Set up Standby as the default low power mode */
371	spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);
372
373	per_cpu(cpu_spm_drv, cpu) = drv;
374
375	return 0;
376	}
377
378	static struct platform_driver spm_driver = {
379	.probe = spm_dev_probe,
380	.driver = {
381	.name = "saw",
382	.of_match_table = spm_match_table,
383	},
384	};
7ce75bb2	385
3b904b04	386	builtin_platform_driver(spm_driver);