arch/arm/mach-msm/spm_devices.c - kernel/msm - Gitiles

 /* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
  *
  * 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/module.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/platform_device.h>
 #include <mach/msm_iomap.h>
 #include <mach/socinfo.h>
 #include "spm.h"
 #include "spm_driver.h"

 struct msm_spm_power_modes {
 	uint32_t mode;
 	bool notify_rpm;
 	uint32_t start_addr;

 };

 struct msm_spm_device {
 	bool initialized;
 	struct msm_spm_driver_data reg_data;
 	struct msm_spm_power_modes *modes;
 	uint32_t num_modes;
 	uint32_t cpu_vdd;
 };

 struct msm_spm_vdd_info {
 	uint32_t cpu;
 	uint32_t vlevel;
 	int err;
 };

 static struct msm_spm_device msm_spm_l2_device;
 static DEFINE_PER_CPU_SHARED_ALIGNED(struct msm_spm_device, msm_cpu_spm_device);
 static bool msm_spm_L2_apcs_master;

 static void msm_spm_smp_set_vdd(void *data)
 {
 	struct msm_spm_device *dev;
 	struct msm_spm_vdd_info *info = (struct msm_spm_vdd_info *)data;

 	if (msm_spm_L2_apcs_master)
 		dev = &msm_spm_l2_device;
 	else
 		dev = &per_cpu(msm_cpu_spm_device, info->cpu);

 	if (!dev->initialized)
 		return;

 	if (msm_spm_L2_apcs_master)
 		get_cpu();

 	dev->cpu_vdd = info->vlevel;
 	info->err = msm_spm_drv_set_vdd(&dev->reg_data, info->vlevel);

 	if (msm_spm_L2_apcs_master)
 		put_cpu();
 }

 /**
  * msm_spm_set_vdd(): Set core voltage
  * @cpu: core id
  * @vlevel: Encoded PMIC data.
  */
 int msm_spm_set_vdd(unsigned int cpu, unsigned int vlevel)
 {
 	struct msm_spm_vdd_info info;
 	int ret;

 	info.cpu = cpu;
 	info.vlevel = vlevel;
 	info.err = -ENODEV;

 	if (!msm_spm_L2_apcs_master && (smp_processor_id() != cpu) &&
 			cpu_online(cpu)) {
 		/**
 		 * We do not want to set the voltage of another core from
 		 * this core, as its possible that we may race the vdd change
 		 * with the SPM state machine of that core, which could also
 		 * be changing the voltage of that core during power collapse.
 		 * Hence, set the function to be executed on that core and block
 		 * until the vdd change is complete.
 		 */
 		ret = smp_call_function_single(cpu, msm_spm_smp_set_vdd,
 				&info, true);
 		if (!ret)
 			ret = info.err;
 	} else {
 		/**
 		 * Since the core is not online, it is safe to set the vdd
 		 * directly.
 		 */
 		msm_spm_smp_set_vdd(&info);
 		ret = info.err;
 	}

 	return ret;
 }
 EXPORT_SYMBOL(msm_spm_set_vdd);

 /**
  * msm_spm_get_vdd(): Get core voltage
  * @cpu: core id
  * @return: Returns encoded PMIC data.
  */
 unsigned int msm_spm_get_vdd(unsigned int cpu)
 {
 	struct msm_spm_device *dev;

 	if (msm_spm_L2_apcs_master)
 		dev = &msm_spm_l2_device;
 	else
 		dev = &per_cpu(msm_cpu_spm_device, cpu);
 	return dev->cpu_vdd;
 }
 EXPORT_SYMBOL(msm_spm_get_vdd);

 static int msm_spm_dev_set_low_power_mode(struct msm_spm_device *dev,
 		unsigned int mode, bool notify_rpm)
 {
 	uint32_t i;
 	uint32_t start_addr = 0;
 	int ret = -EINVAL;

 	if (!dev->initialized)
 		return -ENXIO;

 	if (mode == MSM_SPM_MODE_DISABLED) {
 		ret = msm_spm_drv_set_spm_enable(&dev->reg_data, false);
 	} else if (!msm_spm_drv_set_spm_enable(&dev->reg_data, true)) {
 		for (i = 0; i < dev->num_modes; i++) {
 			if ((dev->modes[i].mode == mode) &&
 				(dev->modes[i].notify_rpm == notify_rpm)) {
 				start_addr = dev->modes[i].start_addr;
 				break;
 			}
 		}
 		ret = msm_spm_drv_set_low_power_mode(&dev->reg_data,
 					start_addr);
 	}
 	return ret;
 }

 static int __devinit msm_spm_dev_init(struct msm_spm_device *dev,
 		struct msm_spm_platform_data *data)
 {
 	int i, ret = -ENOMEM;
 	uint32_t offset = 0;

 	dev->num_modes = data->num_modes;
 	dev->modes = kmalloc(
 			sizeof(struct msm_spm_power_modes) * dev->num_modes,
 			GFP_KERNEL);

 	if (!dev->modes)
 		goto spm_failed_malloc;

 	dev->reg_data.ver_reg = data->ver_reg;
 	ret = msm_spm_drv_init(&dev->reg_data, data);

 	if (ret)
 		goto spm_failed_init;

 	for (i = 0; i < dev->num_modes; i++) {

 		/* Default offset is 0 and gets updated as we write more
 		 * sequences into SPM
 		 */
 		dev->modes[i].start_addr = offset;
 		ret = msm_spm_drv_write_seq_data(&dev->reg_data,
 						data->modes[i].cmd, &offset);
 		if (ret < 0)
 			goto spm_failed_init;

 		dev->modes[i].mode = data->modes[i].mode;
 		dev->modes[i].notify_rpm = data->modes[i].notify_rpm;
 	}
 	msm_spm_drv_flush_seq_entry(&dev->reg_data);
 	dev->initialized = true;
 	return 0;

 spm_failed_init:
 	kfree(dev->modes);
 spm_failed_malloc:
 	return ret;
 }

 /**
  * msm_spm_turn_on_cpu_rail(): Power on cpu rail before turning on core
  * @cpu: core id
  */
 int msm_spm_turn_on_cpu_rail(unsigned int cpu)
 {
 	uint32_t val = 0;
 	uint32_t timeout = 0;
 	void *reg = NULL;
 	void *saw_bases[] = {
 		0,
 		MSM_SAW1_BASE,
 		MSM_SAW2_BASE,
 		MSM_SAW3_BASE
 	};

 	if (cpu == 0 || cpu >= num_possible_cpus())
 		return -EINVAL;

 	reg = saw_bases[cpu];

 	if (soc_class_is_msm8960() || soc_class_is_msm8930() ||
 	    soc_class_is_apq8064()) {
 		val = 0xA4;
 		reg += 0x14;
 		timeout = 512;
 	} else {
 		return -ENOSYS;
 	}

 	writel_relaxed(val, reg);
 	mb();
 	udelay(timeout);

 	return 0;
 }
 EXPORT_SYMBOL(msm_spm_turn_on_cpu_rail);

 void msm_spm_reinit(void)
 {
 	unsigned int cpu;
 	for_each_possible_cpu(cpu)
 		msm_spm_drv_reinit(&per_cpu(msm_cpu_spm_device.reg_data, cpu));
 }
 EXPORT_SYMBOL(msm_spm_reinit);

 /**
  * msm_spm_set_low_power_mode() - Configure SPM start address for low power mode
  * @mode: SPM LPM mode to enter
  * @notify_rpm: Notify RPM in this mode
  */
 int msm_spm_set_low_power_mode(unsigned int mode, bool notify_rpm)
 {
 	struct msm_spm_device *dev = &__get_cpu_var(msm_cpu_spm_device);
 	return msm_spm_dev_set_low_power_mode(dev, mode, notify_rpm);
 }
 EXPORT_SYMBOL(msm_spm_set_low_power_mode);

 /**
  * msm_spm_init(): Board initalization function
  * @data: platform specific SPM register configuration data
  * @nr_devs: Number of SPM devices being initialized
  */
 int __init msm_spm_init(struct msm_spm_platform_data *data, int nr_devs)
 {
 	unsigned int cpu;
 	int ret = 0;

 	BUG_ON((nr_devs < num_possible_cpus()) || !data);

 	for_each_possible_cpu(cpu) {
 		struct msm_spm_device *dev = &per_cpu(msm_cpu_spm_device, cpu);
 		ret = msm_spm_dev_init(dev, &data[cpu]);
 		if (ret < 0) {
 			pr_warn("%s():failed CPU:%u ret:%d\n", __func__,
 					cpu, ret);
 			break;
 		}
 	}

 	return ret;
 }

 #ifdef CONFIG_MSM_L2_SPM

 /**
  * msm_spm_l2_set_low_power_mode(): Configure L2 SPM start address
  *                                  for low power mode
  * @mode: SPM LPM mode to enter
  * @notify_rpm: Notify RPM in this mode
  */
 int msm_spm_l2_set_low_power_mode(unsigned int mode, bool notify_rpm)
 {
 	return msm_spm_dev_set_low_power_mode(
 			&msm_spm_l2_device, mode, notify_rpm);
 }
 EXPORT_SYMBOL(msm_spm_l2_set_low_power_mode);

 void msm_spm_l2_reinit(void)
 {
 	if (!msm_spm_l2_device.initialized)
 		return;
 	msm_spm_drv_reinit(&msm_spm_l2_device.reg_data);
 }
 EXPORT_SYMBOL(msm_spm_l2_reinit);

 /**
  * msm_spm_apcs_set_phase(): Set number of SMPS phases.
  * phase_cnt: Number of phases to be set active
  */
 int msm_spm_apcs_set_phase(unsigned int phase_cnt)
 {
 	if (!msm_spm_l2_device.initialized)
 		return -ENXIO;
 	return msm_spm_drv_set_pmic_data(&msm_spm_l2_device.reg_data,
 			MSM_SPM_PMIC_PHASE_PORT, phase_cnt);
 }
 EXPORT_SYMBOL(msm_spm_apcs_set_phase);

 /** msm_spm_enable_fts_lpm() : Enable FTS to switch to low power
  *                             when the cores are in low power modes
  * @mode: The mode configuration for FTS
  */
 int msm_spm_enable_fts_lpm(uint32_t mode)
 {
 	if (!msm_spm_l2_device.initialized)
 		return -ENXIO;
 	return msm_spm_drv_set_pmic_data(&msm_spm_l2_device.reg_data,
 			MSM_SPM_PMIC_PFM_PORT, mode);
 }
 EXPORT_SYMBOL(msm_spm_enable_fts_lpm);

 /**
  * msm_spm_l2_init(): Board initialization function
  * @data: SPM target specific register configuration
  */
 int __init msm_spm_l2_init(struct msm_spm_platform_data *data)
 {
 	return msm_spm_dev_init(&msm_spm_l2_device, data);
 }
 #endif

 static int __devinit msm_spm_dev_probe(struct platform_device *pdev)
 {
 	int ret = 0;
 	int cpu = 0;
 	int i = 0;
 	struct device_node *node = pdev->dev.of_node;
 	struct msm_spm_platform_data spm_data;
 	char *key = NULL;
 	uint32_t val = 0;
 	struct msm_spm_seq_entry modes[MSM_SPM_MODE_NR];
 	size_t len = 0;
 	struct msm_spm_device *dev = NULL;
 	struct resource *res = NULL;
 	uint32_t mode_count = 0;

 	struct spm_of {
 		char *key;
 		uint32_t id;
 	};

 	struct spm_of spm_of_data[] = {
 		{"qcom,saw2-cfg", MSM_SPM_REG_SAW2_CFG},
 		{"qcom,saw2-avs-ctl", MSM_SPM_REG_SAW2_AVS_CTL},
 		{"qcom,saw2-avs-hysteresis", MSM_SPM_REG_SAW2_AVS_HYSTERESIS},
 		{"qcom,saw2-avs-limit", MSM_SPM_REG_SAW2_AVS_LIMIT},
 		{"qcom,saw2-avs-dly", MSM_SPM_REG_SAW2_AVS_DLY},
 		{"qcom,saw2-spm-dly", MSM_SPM_REG_SAW2_SPM_DLY},
 		{"qcom,saw2-spm-ctl", MSM_SPM_REG_SAW2_SPM_CTL},
 		{"qcom,saw2-pmic-data0", MSM_SPM_REG_SAW2_PMIC_DATA_0},
 		{"qcom,saw2-pmic-data1", MSM_SPM_REG_SAW2_PMIC_DATA_1},
 		{"qcom,saw2-pmic-data2", MSM_SPM_REG_SAW2_PMIC_DATA_2},
 		{"qcom,saw2-pmic-data3", MSM_SPM_REG_SAW2_PMIC_DATA_3},
 		{"qcom,saw2-pmic-data4", MSM_SPM_REG_SAW2_PMIC_DATA_4},
 		{"qcom,saw2-pmic-data5", MSM_SPM_REG_SAW2_PMIC_DATA_5},
 		{"qcom,saw2-pmic-data6", MSM_SPM_REG_SAW2_PMIC_DATA_6},
 		{"qcom,saw2-pmic-data7", MSM_SPM_REG_SAW2_PMIC_DATA_7},
 	};

 	struct mode_of {
 		char *key;
 		uint32_t id;
 		uint32_t notify_rpm;
 	};

 	struct mode_of of_cpu_modes[] = {
 		{"qcom,saw2-spm-cmd-wfi", MSM_SPM_MODE_CLOCK_GATING, 0},
 		{"qcom,saw2-spm-cmd-ret", MSM_SPM_MODE_POWER_RETENTION, 0},
 		{"qcom,saw2-spm-cmd-spc", MSM_SPM_MODE_POWER_COLLAPSE, 0},
 		{"qcom,saw2-spm-cmd-pc", MSM_SPM_MODE_POWER_COLLAPSE, 1},
 	};

 	struct mode_of of_l2_modes[] = {
 		{"qcom,saw2-spm-cmd-ret", MSM_SPM_L2_MODE_RETENTION, 1},
 		{"qcom,saw2-spm-cmd-gdhs", MSM_SPM_L2_MODE_GDHS, 1},
 		{"qcom,saw2-spm-cmd-pc-no-rpm", MSM_SPM_L2_MODE_PC_NO_RPM, 1},
 		{"qcom,saw2-spm-cmd-pc", MSM_SPM_L2_MODE_POWER_COLLAPSE, 1},
 	};

 	struct mode_of *mode_of_data;
 	int num_modes;

 	memset(&spm_data, 0, sizeof(struct msm_spm_platform_data));
 	memset(&modes, 0,
 		(MSM_SPM_MODE_NR - 2) * sizeof(struct msm_spm_seq_entry));

 	key = "qcom,core-id";
 	ret = of_property_read_u32(node, key, &val);
 	if (ret)
 		goto fail;
 	cpu = val;

 	/*
 	 * Device with id 0..NR_CPUS are SPM for apps cores
 	 * Device with id 0xFFFF is for L2 SPM.
 	 */
 	if (cpu >= 0 && cpu < num_possible_cpus()) {
 		mode_of_data = of_cpu_modes;
 		num_modes = ARRAY_SIZE(of_cpu_modes);
 		dev = &per_cpu(msm_cpu_spm_device, cpu);

 	} else if (cpu == 0xffff) {
 		mode_of_data = of_l2_modes;
 		num_modes = ARRAY_SIZE(of_l2_modes);
 		dev = &msm_spm_l2_device;
 	} else
 		return ret;

 	key = "qcom,saw2-ver-reg";
 	ret = of_property_read_u32(node, key, &val);
 	if (ret)
 		goto fail;
 	spm_data.ver_reg = val;

 	key = "qcom,vctl-timeout-us";
 	ret = of_property_read_u32(node, key, &val);
 	if (!ret)
 		spm_data.vctl_timeout_us = val;
 	else if (cpu == 0xffff)
 		goto fail;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res)
 		goto fail;

 	spm_data.reg_base_addr = devm_ioremap(&pdev->dev, res->start,
 					resource_size(res));
 	if (!spm_data.reg_base_addr)
 		return -ENOMEM;

 	spm_data.vctl_port = -1;
 	spm_data.phase_port = -1;
 	spm_data.pfm_port = -1;

 	/* optional */
 	if (dev == &msm_spm_l2_device) {
 		key = "qcom,vctl-port";
 		ret = of_property_read_u32(node, key, &val);
 		if (!ret)
 			spm_data.vctl_port = val;

 		key = "qcom,phase-port";
 		ret = of_property_read_u32(node, key, &val);
 		if (!ret)
 			spm_data.phase_port = val;

 		key = "qcom,pfm-port";
 		ret = of_property_read_u32(node, key, &val);
 		if (!ret)
 			spm_data.pfm_port = val;

 		key = "qcom,L2-spm-is-apcs-master";
 		msm_spm_L2_apcs_master =
 			of_property_read_bool(pdev->dev.of_node, key);
 	}

 	for (i = 0; i < ARRAY_SIZE(spm_of_data); i++) {
 		ret = of_property_read_u32(node, spm_of_data[i].key, &val);
 		if (ret)
 			continue;
 		spm_data.reg_init_values[spm_of_data[i].id] = val;
 	}

 	for (i = 0; i < num_modes; i++) {
 		key = mode_of_data[i].key;
 		modes[mode_count].cmd =
 			(uint8_t *)of_get_property(node, key, &len);
 		if (!modes[mode_count].cmd)
 			continue;
 		modes[mode_count].mode = mode_of_data[i].id;
 		modes[mode_count].notify_rpm = mode_of_data[i].notify_rpm;
 		mode_count++;
 	}

 	spm_data.modes = modes;
 	spm_data.num_modes = mode_count;

 	ret = msm_spm_dev_init(dev, &spm_data);

 	if (ret < 0)
 		pr_warn("%s():failed core-id:%u ret:%d\n", __func__, cpu, ret);

 	return ret;

 fail:
 	pr_err("%s: Failed reading node=%s, key=%s\n",
 			__func__, node->full_name, key);
 	return -EFAULT;
 }

 static struct of_device_id msm_spm_match_table[] = {
 	{.compatible = "qcom,spm-v2"},
 	{},
 };

 static struct platform_driver msm_spm_device_driver = {
 	.probe = msm_spm_dev_probe,
 	.driver = {
 		.name = "spm-v2",
 		.owner = THIS_MODULE,
 		.of_match_table = msm_spm_match_table,
 	},
 };

 /**
  * msm_spm_device_init(): Device tree initialization function
  */
 int __init msm_spm_device_init(void)
 {
 	return platform_driver_register(&msm_spm_device_driver);
 }
	/* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
	*
	* 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/module.h>
	#include <linux/kernel.h>
	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/platform_device.h>
	#include <mach/msm_iomap.h>
	#include <mach/socinfo.h>
	#include "spm.h"
	#include "spm_driver.h"

	struct msm_spm_power_modes {
	uint32_t mode;
	bool notify_rpm;
	uint32_t start_addr;

	};

	struct msm_spm_device {
	bool initialized;
	struct msm_spm_driver_data reg_data;
	struct msm_spm_power_modes *modes;
	uint32_t num_modes;
	uint32_t cpu_vdd;
	};

	struct msm_spm_vdd_info {
	uint32_t cpu;
	uint32_t vlevel;
	int err;
	};

	static struct msm_spm_device msm_spm_l2_device;
	static DEFINE_PER_CPU_SHARED_ALIGNED(struct msm_spm_device, msm_cpu_spm_device);
	static bool msm_spm_L2_apcs_master;

	static void msm_spm_smp_set_vdd(void *data)
	{
	struct msm_spm_device *dev;
	struct msm_spm_vdd_info info = (struct msm_spm_vdd_info )data;

	if (msm_spm_L2_apcs_master)
	dev = &msm_spm_l2_device;
	else
	dev = &per_cpu(msm_cpu_spm_device, info->cpu);

	if (!dev->initialized)
	return;

	if (msm_spm_L2_apcs_master)
	get_cpu();

	dev->cpu_vdd = info->vlevel;
	info->err = msm_spm_drv_set_vdd(&dev->reg_data, info->vlevel);

	if (msm_spm_L2_apcs_master)
	put_cpu();
	}

	/**
	* msm_spm_set_vdd(): Set core voltage
	* @cpu: core id
	* @vlevel: Encoded PMIC data.
	*/
	int msm_spm_set_vdd(unsigned int cpu, unsigned int vlevel)
	{
	struct msm_spm_vdd_info info;
	int ret;

	info.cpu = cpu;
	info.vlevel = vlevel;
	info.err = -ENODEV;

	if (!msm_spm_L2_apcs_master && (smp_processor_id() != cpu) &&
	cpu_online(cpu)) {
	/**
	* We do not want to set the voltage of another core from
	* this core, as its possible that we may race the vdd change
	* with the SPM state machine of that core, which could also
	* be changing the voltage of that core during power collapse.
	* Hence, set the function to be executed on that core and block
	* until the vdd change is complete.
	*/
	ret = smp_call_function_single(cpu, msm_spm_smp_set_vdd,
	&info, true);
	if (!ret)
	ret = info.err;
	} else {
	/**
	* Since the core is not online, it is safe to set the vdd
	* directly.
	*/
	msm_spm_smp_set_vdd(&info);
	ret = info.err;
	}

	return ret;
	}
	EXPORT_SYMBOL(msm_spm_set_vdd);

	/**
	* msm_spm_get_vdd(): Get core voltage
	* @cpu: core id
	* @return: Returns encoded PMIC data.
	*/
	unsigned int msm_spm_get_vdd(unsigned int cpu)
	{
	struct msm_spm_device *dev;

	if (msm_spm_L2_apcs_master)
	dev = &msm_spm_l2_device;
	else
	dev = &per_cpu(msm_cpu_spm_device, cpu);
	return dev->cpu_vdd;
	}
	EXPORT_SYMBOL(msm_spm_get_vdd);

	static int msm_spm_dev_set_low_power_mode(struct msm_spm_device *dev,
	unsigned int mode, bool notify_rpm)
	{
	uint32_t i;
	uint32_t start_addr = 0;
	int ret = -EINVAL;

	if (!dev->initialized)
	return -ENXIO;

	if (mode == MSM_SPM_MODE_DISABLED) {
	ret = msm_spm_drv_set_spm_enable(&dev->reg_data, false);
	} else if (!msm_spm_drv_set_spm_enable(&dev->reg_data, true)) {
	for (i = 0; i < dev->num_modes; i++) {
	if ((dev->modes[i].mode == mode) &&
	(dev->modes[i].notify_rpm == notify_rpm)) {
	start_addr = dev->modes[i].start_addr;
	break;
	}
	}
	ret = msm_spm_drv_set_low_power_mode(&dev->reg_data,
	start_addr);
	}
	return ret;
	}

	static int __devinit msm_spm_dev_init(struct msm_spm_device *dev,
	struct msm_spm_platform_data *data)
	{
	int i, ret = -ENOMEM;
	uint32_t offset = 0;

	dev->num_modes = data->num_modes;
	dev->modes = kmalloc(
	sizeof(struct msm_spm_power_modes) * dev->num_modes,
	GFP_KERNEL);

	if (!dev->modes)
	goto spm_failed_malloc;

	dev->reg_data.ver_reg = data->ver_reg;
	ret = msm_spm_drv_init(&dev->reg_data, data);

	if (ret)
	goto spm_failed_init;

	for (i = 0; i < dev->num_modes; i++) {

	/* Default offset is 0 and gets updated as we write more
	* sequences into SPM
	*/
	dev->modes[i].start_addr = offset;
	ret = msm_spm_drv_write_seq_data(&dev->reg_data,
	data->modes[i].cmd, &offset);
	if (ret < 0)
	goto spm_failed_init;

	dev->modes[i].mode = data->modes[i].mode;
	dev->modes[i].notify_rpm = data->modes[i].notify_rpm;
	}
	msm_spm_drv_flush_seq_entry(&dev->reg_data);
	dev->initialized = true;
	return 0;

	spm_failed_init:
	kfree(dev->modes);
	spm_failed_malloc:
	return ret;
	}

	/**
	* msm_spm_turn_on_cpu_rail(): Power on cpu rail before turning on core
	* @cpu: core id
	*/
	int msm_spm_turn_on_cpu_rail(unsigned int cpu)
	{
	uint32_t val = 0;
	uint32_t timeout = 0;
	void *reg = NULL;
	void *saw_bases[] = {
	0,
	MSM_SAW1_BASE,
	MSM_SAW2_BASE,
	MSM_SAW3_BASE
	};

	if (cpu == 0 \|\| cpu >= num_possible_cpus())
	return -EINVAL;

	reg = saw_bases[cpu];

	if (soc_class_is_msm8960() \|\| soc_class_is_msm8930() \|\|
	soc_class_is_apq8064()) {
	val = 0xA4;
	reg += 0x14;
	timeout = 512;
	} else {
	return -ENOSYS;
	}

	writel_relaxed(val, reg);
	mb();
	udelay(timeout);

	return 0;
	}
	EXPORT_SYMBOL(msm_spm_turn_on_cpu_rail);

	void msm_spm_reinit(void)
	{
	unsigned int cpu;
	for_each_possible_cpu(cpu)
	msm_spm_drv_reinit(&per_cpu(msm_cpu_spm_device.reg_data, cpu));
	}
	EXPORT_SYMBOL(msm_spm_reinit);

	/**
	* msm_spm_set_low_power_mode() - Configure SPM start address for low power mode
	* @mode: SPM LPM mode to enter
	* @notify_rpm: Notify RPM in this mode
	*/
	int msm_spm_set_low_power_mode(unsigned int mode, bool notify_rpm)
	{
	struct msm_spm_device *dev = &__get_cpu_var(msm_cpu_spm_device);
	return msm_spm_dev_set_low_power_mode(dev, mode, notify_rpm);
	}
	EXPORT_SYMBOL(msm_spm_set_low_power_mode);

	/**
	* msm_spm_init(): Board initalization function
	* @data: platform specific SPM register configuration data
	* @nr_devs: Number of SPM devices being initialized
	*/
	int __init msm_spm_init(struct msm_spm_platform_data *data, int nr_devs)
	{
	unsigned int cpu;
	int ret = 0;

	BUG_ON((nr_devs < num_possible_cpus()) \|\| !data);

	for_each_possible_cpu(cpu) {
	struct msm_spm_device *dev = &per_cpu(msm_cpu_spm_device, cpu);
	ret = msm_spm_dev_init(dev, &data[cpu]);
	if (ret < 0) {
	pr_warn("%s():failed CPU:%u ret:%d\n", __func__,
	cpu, ret);
	break;
	}
	}

	return ret;
	}

	#ifdef CONFIG_MSM_L2_SPM

	/**
	* msm_spm_l2_set_low_power_mode(): Configure L2 SPM start address
	* for low power mode
	* @mode: SPM LPM mode to enter
	* @notify_rpm: Notify RPM in this mode
	*/
	int msm_spm_l2_set_low_power_mode(unsigned int mode, bool notify_rpm)
	{
	return msm_spm_dev_set_low_power_mode(
	&msm_spm_l2_device, mode, notify_rpm);
	}
	EXPORT_SYMBOL(msm_spm_l2_set_low_power_mode);

	void msm_spm_l2_reinit(void)
	{
	if (!msm_spm_l2_device.initialized)
	return;
	msm_spm_drv_reinit(&msm_spm_l2_device.reg_data);
	}
	EXPORT_SYMBOL(msm_spm_l2_reinit);

	/**
	* msm_spm_apcs_set_phase(): Set number of SMPS phases.
	* phase_cnt: Number of phases to be set active
	*/
	int msm_spm_apcs_set_phase(unsigned int phase_cnt)
	{
	if (!msm_spm_l2_device.initialized)
	return -ENXIO;
	return msm_spm_drv_set_pmic_data(&msm_spm_l2_device.reg_data,
	MSM_SPM_PMIC_PHASE_PORT, phase_cnt);
	}
	EXPORT_SYMBOL(msm_spm_apcs_set_phase);

	/** msm_spm_enable_fts_lpm() : Enable FTS to switch to low power
	* when the cores are in low power modes
	* @mode: The mode configuration for FTS
	*/
	int msm_spm_enable_fts_lpm(uint32_t mode)
	{
	if (!msm_spm_l2_device.initialized)
	return -ENXIO;
	return msm_spm_drv_set_pmic_data(&msm_spm_l2_device.reg_data,
	MSM_SPM_PMIC_PFM_PORT, mode);
	}
	EXPORT_SYMBOL(msm_spm_enable_fts_lpm);

	/**
	* msm_spm_l2_init(): Board initialization function
	* @data: SPM target specific register configuration
	*/
	int __init msm_spm_l2_init(struct msm_spm_platform_data *data)
	{
	return msm_spm_dev_init(&msm_spm_l2_device, data);
	}
	#endif

	static int __devinit msm_spm_dev_probe(struct platform_device *pdev)
	{
	int ret = 0;
	int cpu = 0;
	int i = 0;
	struct device_node *node = pdev->dev.of_node;
	struct msm_spm_platform_data spm_data;
	char *key = NULL;
	uint32_t val = 0;
	struct msm_spm_seq_entry modes[MSM_SPM_MODE_NR];
	size_t len = 0;
	struct msm_spm_device *dev = NULL;
	struct resource *res = NULL;
	uint32_t mode_count = 0;

	struct spm_of {
	char *key;
	uint32_t id;
	};

	struct spm_of spm_of_data[] = {
	{"qcom,saw2-cfg", MSM_SPM_REG_SAW2_CFG},
	{"qcom,saw2-avs-ctl", MSM_SPM_REG_SAW2_AVS_CTL},
	{"qcom,saw2-avs-hysteresis", MSM_SPM_REG_SAW2_AVS_HYSTERESIS},
	{"qcom,saw2-avs-limit", MSM_SPM_REG_SAW2_AVS_LIMIT},
	{"qcom,saw2-avs-dly", MSM_SPM_REG_SAW2_AVS_DLY},
	{"qcom,saw2-spm-dly", MSM_SPM_REG_SAW2_SPM_DLY},
	{"qcom,saw2-spm-ctl", MSM_SPM_REG_SAW2_SPM_CTL},
	{"qcom,saw2-pmic-data0", MSM_SPM_REG_SAW2_PMIC_DATA_0},
	{"qcom,saw2-pmic-data1", MSM_SPM_REG_SAW2_PMIC_DATA_1},
	{"qcom,saw2-pmic-data2", MSM_SPM_REG_SAW2_PMIC_DATA_2},
	{"qcom,saw2-pmic-data3", MSM_SPM_REG_SAW2_PMIC_DATA_3},
	{"qcom,saw2-pmic-data4", MSM_SPM_REG_SAW2_PMIC_DATA_4},
	{"qcom,saw2-pmic-data5", MSM_SPM_REG_SAW2_PMIC_DATA_5},
	{"qcom,saw2-pmic-data6", MSM_SPM_REG_SAW2_PMIC_DATA_6},
	{"qcom,saw2-pmic-data7", MSM_SPM_REG_SAW2_PMIC_DATA_7},
	};

	struct mode_of {
	char *key;
	uint32_t id;
	uint32_t notify_rpm;
	};

	struct mode_of of_cpu_modes[] = {
	{"qcom,saw2-spm-cmd-wfi", MSM_SPM_MODE_CLOCK_GATING, 0},
	{"qcom,saw2-spm-cmd-ret", MSM_SPM_MODE_POWER_RETENTION, 0},
	{"qcom,saw2-spm-cmd-spc", MSM_SPM_MODE_POWER_COLLAPSE, 0},
	{"qcom,saw2-spm-cmd-pc", MSM_SPM_MODE_POWER_COLLAPSE, 1},
	};

	struct mode_of of_l2_modes[] = {
	{"qcom,saw2-spm-cmd-ret", MSM_SPM_L2_MODE_RETENTION, 1},
	{"qcom,saw2-spm-cmd-gdhs", MSM_SPM_L2_MODE_GDHS, 1},
	{"qcom,saw2-spm-cmd-pc-no-rpm", MSM_SPM_L2_MODE_PC_NO_RPM, 1},
	{"qcom,saw2-spm-cmd-pc", MSM_SPM_L2_MODE_POWER_COLLAPSE, 1},
	};

	struct mode_of *mode_of_data;
	int num_modes;

	memset(&spm_data, 0, sizeof(struct msm_spm_platform_data));
	memset(&modes, 0,
	(MSM_SPM_MODE_NR - 2) * sizeof(struct msm_spm_seq_entry));

	key = "qcom,core-id";
	ret = of_property_read_u32(node, key, &val);
	if (ret)
	goto fail;
	cpu = val;

	/*
	* Device with id 0..NR_CPUS are SPM for apps cores
	* Device with id 0xFFFF is for L2 SPM.
	*/
	if (cpu >= 0 && cpu < num_possible_cpus()) {
	mode_of_data = of_cpu_modes;
	num_modes = ARRAY_SIZE(of_cpu_modes);
	dev = &per_cpu(msm_cpu_spm_device, cpu);

	} else if (cpu == 0xffff) {
	mode_of_data = of_l2_modes;
	num_modes = ARRAY_SIZE(of_l2_modes);
	dev = &msm_spm_l2_device;
	} else
	return ret;

	key = "qcom,saw2-ver-reg";
	ret = of_property_read_u32(node, key, &val);
	if (ret)
	goto fail;
	spm_data.ver_reg = val;

	key = "qcom,vctl-timeout-us";
	ret = of_property_read_u32(node, key, &val);
	if (!ret)
	spm_data.vctl_timeout_us = val;
	else if (cpu == 0xffff)
	goto fail;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
	goto fail;

	spm_data.reg_base_addr = devm_ioremap(&pdev->dev, res->start,
	resource_size(res));
	if (!spm_data.reg_base_addr)
	return -ENOMEM;

	spm_data.vctl_port = -1;
	spm_data.phase_port = -1;
	spm_data.pfm_port = -1;

	/* optional */
	if (dev == &msm_spm_l2_device) {
	key = "qcom,vctl-port";
	ret = of_property_read_u32(node, key, &val);
	if (!ret)
	spm_data.vctl_port = val;

	key = "qcom,phase-port";
	ret = of_property_read_u32(node, key, &val);
	if (!ret)
	spm_data.phase_port = val;

	key = "qcom,pfm-port";
	ret = of_property_read_u32(node, key, &val);
	if (!ret)
	spm_data.pfm_port = val;

	key = "qcom,L2-spm-is-apcs-master";
	msm_spm_L2_apcs_master =
	of_property_read_bool(pdev->dev.of_node, key);
	}

	for (i = 0; i < ARRAY_SIZE(spm_of_data); i++) {
	ret = of_property_read_u32(node, spm_of_data[i].key, &val);
	if (ret)
	continue;
	spm_data.reg_init_values[spm_of_data[i].id] = val;
	}

	for (i = 0; i < num_modes; i++) {
	key = mode_of_data[i].key;
	modes[mode_count].cmd =
	(uint8_t *)of_get_property(node, key, &len);
	if (!modes[mode_count].cmd)
	continue;
	modes[mode_count].mode = mode_of_data[i].id;
	modes[mode_count].notify_rpm = mode_of_data[i].notify_rpm;
	mode_count++;
	}

	spm_data.modes = modes;
	spm_data.num_modes = mode_count;

	ret = msm_spm_dev_init(dev, &spm_data);

	if (ret < 0)
	pr_warn("%s():failed core-id:%u ret:%d\n", __func__, cpu, ret);

	return ret;

	fail:
	pr_err("%s: Failed reading node=%s, key=%s\n",
	__func__, node->full_name, key);
	return -EFAULT;
	}

	static struct of_device_id msm_spm_match_table[] = {
	{.compatible = "qcom,spm-v2"},
	{},
	};

	static struct platform_driver msm_spm_device_driver = {
	.probe = msm_spm_dev_probe,
	.driver = {
	.name = "spm-v2",
	.owner = THIS_MODULE,
	.of_match_table = msm_spm_match_table,
	},
	};

	/**
	* msm_spm_device_init(): Device tree initialization function
	*/
	int __init msm_spm_device_init(void)
	{
	return platform_driver_register(&msm_spm_device_driver);
	}