arch/arm/mach-msm/msm_vp.c - kernel/msm - Git at Google

 /*
  * Copyright (c) 2012, 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.
  *
  */

 #define pr_fmt(fmt) "%s: " fmt, __func__

 #include <linux/module.h>
 #include <linux/io.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>

 #include <mach/msm_iomap.h>

 /* Address for Perf Level Registor */
 #define VDD_APC_PLEVEL_BASE (MSM_CLK_CTL_BASE + 0x0298)
 #define VDD_APC_PLEVEL(n) (VDD_APC_PLEVEL_BASE + 4 * n)

 /* Address for SYS_P_Level register */
 #define VDD_SVS_PLEVEL_ADDR (MSM_CSR_BASE + 0x124)

 #define MV_TO_UV(mv) ((mv)*1000)
 #define UV_TO_MV(uv) (((uv)+999)/1000)

 #define MSM_VP_REGULATOR_DEV_NAME  "vp-regulator"

 /**
  * Convert Voltage to PLEVEL register value
  * Here x is required voltage in minivolt
  * e.g. if Required voltage is 1200mV then
  * required value to be programmed into the
  * Plevel register is 0x32. This equation is
  * based on H/W logic being used in SVS controller.
  *
  * Here we are taking the minimum voltage step
  * to be 12.5mV as per H/W logic and adding 0x20
  * is for selecting the reference voltage.
  * 750mV is minimum voltage of MSMC2 smps.
  */
 #define VOLT_TO_BIT(x) (((x-750)/(12500/1000)) + 0x20)
 #define VREG_VREF_SEL		(1 << 5)
 #define VREG_VREF_SEL_SHIFT	(0x5)
 #define VREG_PD_EN		(1 << 6)
 #define VREG_PD_EN_SHIFT	(0x6)
 #define VREG_LVL_M		(0x1F)

 /**
  * struct msm_vp -  Structure for VP
  * @regulator_dev: structure for regulator device
  * @current_voltage: current voltage value
  */
 struct msm_vp {
 	struct device		*dev;
 	struct regulator_dev	*rdev;
 	int current_voltage;
 };

 /* Function to change the Vdd Level */
 static int vp_reg_set_voltage(struct regulator_dev *rdev, int min_uV,
 						int max_uV, unsigned *sel)
 {
 	struct msm_vp *vp = rdev_get_drvdata(rdev);
 	uint32_t reg_val, perf_level, plevel, cur_plevel, fine_step_volt;

 	reg_val = readl_relaxed(VDD_SVS_PLEVEL_ADDR);
 	perf_level = reg_val & 0x07;

 	plevel = (min_uV - 750000) / 25000;
 	fine_step_volt = (min_uV - 750000) % 25000;

 	/**
 	 * Program the new voltage level for the current perf_level
 	 * in corresponding PLEVEL register.
 	 */
 	cur_plevel = readl_relaxed(VDD_APC_PLEVEL(perf_level));
 	/* clear lower 7 bits */
 	cur_plevel &= ~(0x7F);
 	cur_plevel |= (plevel | VREG_VREF_SEL);
 	if (fine_step_volt >= 12500)
 		cur_plevel |= VREG_PD_EN;
 	writel_relaxed(cur_plevel, VDD_APC_PLEVEL(perf_level));

 	/* Clear the current perf level */
 	reg_val &= 0xF8;
 	writel_relaxed(reg_val, VDD_SVS_PLEVEL_ADDR);

 	/* Initiate the PMIC SSBI request to change the voltage */
 	reg_val |= (BIT(7) | perf_level << 3);
 	writel_relaxed(reg_val, VDD_SVS_PLEVEL_ADDR);
 	mb();
 	udelay(62);

 	if ((readl_relaxed(VDD_SVS_PLEVEL_ADDR) & 0x07) != perf_level) {
 		pr_err("Vdd Set Failed\n");
 		return -EIO;
 	}

 	vp->current_voltage = (min_uV / 1000);
 	return 0;
 }

 static int vp_reg_get_voltage(struct regulator_dev *rdev)
 {
 	uint32_t reg_val, perf_level, vlevel, cur_plevel;
 	uint32_t vref_sel, pd_en;
 	uint32_t cur_voltage;

 	reg_val = readl_relaxed(VDD_SVS_PLEVEL_ADDR);
 	perf_level = reg_val & 0x07;

 	cur_plevel = readl_relaxed(VDD_APC_PLEVEL(perf_level));
 	vref_sel = (cur_plevel >> VREG_VREF_SEL_SHIFT) & 0x1;
 	pd_en = (cur_plevel >> VREG_PD_EN_SHIFT) & 0x1;
 	vlevel = cur_plevel & VREG_LVL_M;

 	cur_voltage = (750000 + (pd_en * 12500) +
 				(vlevel * 25000)) * (2 - vref_sel);
 	return cur_voltage;
 }

 static int vp_reg_enable(struct regulator_dev *rdev)
 {
 	return 0;
 }

 static int vp_reg_disable(struct regulator_dev *rdev)
 {
 	return 0;
 }

 /* Regulator registration specific data */
 /* FIXME: should move to board-xx-regulator.c file */
 static struct regulator_consumer_supply vp_consumer =
 	REGULATOR_SUPPLY("vddx_cx", "msm-cpr");

 static struct regulator_init_data vp_reg_data = {
 	.constraints	= {
 		.name		= "vddx_c2",
 		.min_uV		= 750000,
 		.max_uV		= 1500000,
 		.valid_ops_mask	= REGULATOR_CHANGE_VOLTAGE |
 					REGULATOR_CHANGE_STATUS,
 		.valid_modes_mask = REGULATOR_MODE_NORMAL,
 		.boot_on	= 1,
 		.input_uV	= 0,
 		.always_on	= 1,
 	},
 	.num_consumer_supplies = 1,
 	.consumer_supplies = &vp_consumer,
 };

 /* Regulator specific ops */
 static struct regulator_ops vp_reg_ops = {
 	.enable			= vp_reg_enable,
 	.disable		= vp_reg_disable,
 	.get_voltage		= vp_reg_get_voltage,
 	.set_voltage		= vp_reg_set_voltage,
 };

 /* Regulator Description */
 static struct regulator_desc vp_reg = {
 	.name = "vddcx",
 	.id = -1,
 	.ops = &vp_reg_ops,
 	.type = REGULATOR_VOLTAGE,
 };

 static int __devinit msm_vp_reg_probe(struct platform_device *pdev)
 {
 	struct msm_vp *vp;
 	int rc;

 	vp = kzalloc(sizeof(struct msm_vp), GFP_KERNEL);
 	if (!vp) {
 		pr_err("Could not allocate memory for VP\n");
 		return -ENOMEM;
 	}

 	vp->rdev = regulator_register(&vp_reg, NULL, &vp_reg_data, vp, NULL);
 	if (IS_ERR(vp->rdev)) {
 		rc = PTR_ERR(vp->rdev);
 		pr_err("Failed to register regulator: %d\n", rc);
 		goto error;
 	}

 	platform_set_drvdata(pdev, vp);

 	return 0;
 error:
 	kfree(vp);
 	return rc;
 }

 static int __devexit msm_vp_reg_remove(struct platform_device *pdev)
 {
 	struct msm_vp *vp = platform_get_drvdata(pdev);

 	regulator_unregister(vp->rdev);
 	platform_set_drvdata(pdev, NULL);
 	kfree(vp);

 	return 0;
 }

 static struct platform_driver msm_vp_reg_driver = {
 	.probe	= msm_vp_reg_probe,
 	.remove = __devexit_p(msm_vp_reg_remove),
 	.driver = {
 		.name	= MSM_VP_REGULATOR_DEV_NAME,
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init msm_vp_reg_init(void)
 {
 	return platform_driver_register(&msm_vp_reg_driver);
 }
 postcore_initcall(msm_vp_reg_init);

 static void __exit msm_vp_reg_exit(void)
 {
 	platform_driver_unregister(&msm_vp_reg_driver);
 }
 module_exit(msm_vp_reg_exit);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("MSM VP regulator driver");
 MODULE_VERSION("1.0");
 MODULE_ALIAS("platform:" MSM_VP_REGULATOR_DEV_NAME);
	/*
	* Copyright (c) 2012, 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.
	*
	*/

	#define pr_fmt(fmt) "%s: " fmt, __func__

	#include <linux/module.h>
	#include <linux/io.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>

	#include <mach/msm_iomap.h>

	/* Address for Perf Level Registor */
	#define VDD_APC_PLEVEL_BASE (MSM_CLK_CTL_BASE + 0x0298)
	#define VDD_APC_PLEVEL(n) (VDD_APC_PLEVEL_BASE + 4 * n)

	/* Address for SYS_P_Level register */
	#define VDD_SVS_PLEVEL_ADDR (MSM_CSR_BASE + 0x124)

	#define MV_TO_UV(mv) ((mv)*1000)
	#define UV_TO_MV(uv) (((uv)+999)/1000)

	#define MSM_VP_REGULATOR_DEV_NAME "vp-regulator"

	/**
	* Convert Voltage to PLEVEL register value
	* Here x is required voltage in minivolt
	* e.g. if Required voltage is 1200mV then
	* required value to be programmed into the
	* Plevel register is 0x32. This equation is
	* based on H/W logic being used in SVS controller.
	*
	* Here we are taking the minimum voltage step
	* to be 12.5mV as per H/W logic and adding 0x20
	* is for selecting the reference voltage.
	* 750mV is minimum voltage of MSMC2 smps.
	*/
	#define VOLT_TO_BIT(x) (((x-750)/(12500/1000)) + 0x20)
	#define VREG_VREF_SEL (1 << 5)
	#define VREG_VREF_SEL_SHIFT (0x5)
	#define VREG_PD_EN (1 << 6)
	#define VREG_PD_EN_SHIFT (0x6)
	#define VREG_LVL_M (0x1F)

	/**
	* struct msm_vp - Structure for VP
	* @regulator_dev: structure for regulator device
	* @current_voltage: current voltage value
	*/
	struct msm_vp {
	struct device *dev;
	struct regulator_dev *rdev;
	int current_voltage;
	};

	/* Function to change the Vdd Level */
	static int vp_reg_set_voltage(struct regulator_dev *rdev, int min_uV,
	int max_uV, unsigned *sel)
	{
	struct msm_vp *vp = rdev_get_drvdata(rdev);
	uint32_t reg_val, perf_level, plevel, cur_plevel, fine_step_volt;

	reg_val = readl_relaxed(VDD_SVS_PLEVEL_ADDR);
	perf_level = reg_val & 0x07;

	plevel = (min_uV - 750000) / 25000;
	fine_step_volt = (min_uV - 750000) % 25000;

	/**
	* Program the new voltage level for the current perf_level
	* in corresponding PLEVEL register.
	*/
	cur_plevel = readl_relaxed(VDD_APC_PLEVEL(perf_level));
	/* clear lower 7 bits */
	cur_plevel &= ~(0x7F);
	cur_plevel \|= (plevel \| VREG_VREF_SEL);
	if (fine_step_volt >= 12500)
	cur_plevel \|= VREG_PD_EN;
	writel_relaxed(cur_plevel, VDD_APC_PLEVEL(perf_level));

	/* Clear the current perf level */
	reg_val &= 0xF8;
	writel_relaxed(reg_val, VDD_SVS_PLEVEL_ADDR);

	/* Initiate the PMIC SSBI request to change the voltage */
	reg_val \|= (BIT(7) \| perf_level << 3);
	writel_relaxed(reg_val, VDD_SVS_PLEVEL_ADDR);
	mb();
	udelay(62);

	if ((readl_relaxed(VDD_SVS_PLEVEL_ADDR) & 0x07) != perf_level) {
	pr_err("Vdd Set Failed\n");
	return -EIO;
	}

	vp->current_voltage = (min_uV / 1000);
	return 0;
	}

	static int vp_reg_get_voltage(struct regulator_dev *rdev)
	{
	uint32_t reg_val, perf_level, vlevel, cur_plevel;
	uint32_t vref_sel, pd_en;
	uint32_t cur_voltage;

	reg_val = readl_relaxed(VDD_SVS_PLEVEL_ADDR);
	perf_level = reg_val & 0x07;

	cur_plevel = readl_relaxed(VDD_APC_PLEVEL(perf_level));
	vref_sel = (cur_plevel >> VREG_VREF_SEL_SHIFT) & 0x1;
	pd_en = (cur_plevel >> VREG_PD_EN_SHIFT) & 0x1;
	vlevel = cur_plevel & VREG_LVL_M;

	cur_voltage = (750000 + (pd_en * 12500) +
	(vlevel * 25000)) * (2 - vref_sel);
	return cur_voltage;
	}

	static int vp_reg_enable(struct regulator_dev *rdev)
	{
	return 0;
	}

	static int vp_reg_disable(struct regulator_dev *rdev)
	{
	return 0;
	}

	/* Regulator registration specific data */
	/* FIXME: should move to board-xx-regulator.c file */
	static struct regulator_consumer_supply vp_consumer =
	REGULATOR_SUPPLY("vddx_cx", "msm-cpr");

	static struct regulator_init_data vp_reg_data = {
	.constraints = {
	.name = "vddx_c2",
	.min_uV = 750000,
	.max_uV = 1500000,
	.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE \|
	REGULATOR_CHANGE_STATUS,
	.valid_modes_mask = REGULATOR_MODE_NORMAL,
	.boot_on = 1,
	.input_uV = 0,
	.always_on = 1,
	},
	.num_consumer_supplies = 1,
	.consumer_supplies = &vp_consumer,
	};

	/* Regulator specific ops */
	static struct regulator_ops vp_reg_ops = {
	.enable = vp_reg_enable,
	.disable = vp_reg_disable,
	.get_voltage = vp_reg_get_voltage,
	.set_voltage = vp_reg_set_voltage,
	};

	/* Regulator Description */
	static struct regulator_desc vp_reg = {
	.name = "vddcx",
	.id = -1,
	.ops = &vp_reg_ops,
	.type = REGULATOR_VOLTAGE,
	};

	static int __devinit msm_vp_reg_probe(struct platform_device *pdev)
	{
	struct msm_vp *vp;
	int rc;

	vp = kzalloc(sizeof(struct msm_vp), GFP_KERNEL);
	if (!vp) {
	pr_err("Could not allocate memory for VP\n");
	return -ENOMEM;
	}

	vp->rdev = regulator_register(&vp_reg, NULL, &vp_reg_data, vp, NULL);
	if (IS_ERR(vp->rdev)) {
	rc = PTR_ERR(vp->rdev);
	pr_err("Failed to register regulator: %d\n", rc);
	goto error;
	}

	platform_set_drvdata(pdev, vp);

	return 0;
	error:
	kfree(vp);
	return rc;
	}

	static int __devexit msm_vp_reg_remove(struct platform_device *pdev)
	{
	struct msm_vp *vp = platform_get_drvdata(pdev);

	regulator_unregister(vp->rdev);
	platform_set_drvdata(pdev, NULL);
	kfree(vp);

	return 0;
	}

	static struct platform_driver msm_vp_reg_driver = {
	.probe = msm_vp_reg_probe,
	.remove = __devexit_p(msm_vp_reg_remove),
	.driver = {
	.name = MSM_VP_REGULATOR_DEV_NAME,
	.owner = THIS_MODULE,
	},
	};

	static int __init msm_vp_reg_init(void)
	{
	return platform_driver_register(&msm_vp_reg_driver);
	}
	postcore_initcall(msm_vp_reg_init);

	static void __exit msm_vp_reg_exit(void)
	{
	platform_driver_unregister(&msm_vp_reg_driver);
	}
	module_exit(msm_vp_reg_exit);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("MSM VP regulator driver");
	MODULE_VERSION("1.0");
	MODULE_ALIAS("platform:" MSM_VP_REGULATOR_DEV_NAME);