1/*
  2 * Device driver for regulators in Hi655x IC
  3 *
  4 * Copyright (c) 2016 Hisilicon.
  5 *
  6 * Authors:
  7 * Chen Feng <puck.chen@hisilicon.com>
  8 * Fei  Wang <w.f@huawei.com>
  9 *
 10 * This program is free software; you can redistribute it and/or modify
 11 * it under the terms of the GNU General Public License version 2 as
 12 * published by the Free Software Foundation.
 13 */
 14
 15#include <linux/bitops.h>
 16#include <linux/device.h>
 17#include <linux/err.h>
 18#include <linux/module.h>
 19#include <linux/io.h>
 20#include <linux/of.h>
 21#include <linux/platform_device.h>
 22#include <linux/regmap.h>
 23#include <linux/regulator/driver.h>
 24#include <linux/regulator/machine.h>
 25#include <linux/regulator/of_regulator.h>
 26#include <linux/mfd/hi655x-pmic.h>
 27
 28struct hi655x_regulator {
 29	unsigned int disable_reg;
 30	unsigned int status_reg;
 31	unsigned int ctrl_regs;
 32	unsigned int ctrl_mask;
 33	struct regulator_desc rdesc;
 34};
 35
 36/* LDO7 & LDO10 */
 37static const unsigned int ldo7_voltages[] = {
 38	1800000, 1850000, 2850000, 2900000,
 39	3000000, 3100000, 3200000, 3300000,
 40};
 41
 42static const unsigned int ldo19_voltages[] = {
 43	1800000, 1850000, 1900000, 1750000,
 44	2800000, 2850000, 2900000, 3000000,
 45};
 46
 47static const unsigned int ldo22_voltages[] = {
 48	 900000, 1000000, 1050000, 1100000,
 49	1150000, 1175000, 1185000, 1200000,
 50};
 51
 52enum hi655x_regulator_id {
 53	HI655X_LDO0,
 54	HI655X_LDO1,
 55	HI655X_LDO2,
 56	HI655X_LDO3,
 57	HI655X_LDO4,
 58	HI655X_LDO5,
 59	HI655X_LDO6,
 60	HI655X_LDO7,
 61	HI655X_LDO8,
 62	HI655X_LDO9,
 63	HI655X_LDO10,
 64	HI655X_LDO11,
 65	HI655X_LDO12,
 66	HI655X_LDO13,
 67	HI655X_LDO14,
 68	HI655X_LDO15,
 69	HI655X_LDO16,
 70	HI655X_LDO17,
 71	HI655X_LDO18,
 72	HI655X_LDO19,
 73	HI655X_LDO20,
 74	HI655X_LDO21,
 75	HI655X_LDO22,
 76};
 77
 78static int hi655x_is_enabled(struct regulator_dev *rdev)
 79{
 80	unsigned int value = 0;
 81
 82	struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
 83
 84	regmap_read(rdev->regmap, regulator->status_reg, &value);
 85	return (value & BIT(regulator->ctrl_mask));
 86}
 87
 88static int hi655x_disable(struct regulator_dev *rdev)
 89{
 90	int ret = 0;
 91
 92	struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
 93
 94	ret = regmap_write(rdev->regmap, regulator->disable_reg,
 95			   BIT(regulator->ctrl_mask));
 96	return ret;
 97}
 98
 99static struct regulator_ops hi655x_regulator_ops = {
100	.enable = regulator_enable_regmap,
101	.disable = hi655x_disable,
102	.is_enabled = hi655x_is_enabled,
103	.list_voltage = regulator_list_voltage_table,
104	.get_voltage_sel = regulator_get_voltage_sel_regmap,
105	.set_voltage_sel = regulator_set_voltage_sel_regmap,
106};
107
108static struct regulator_ops hi655x_ldo_linear_ops = {
109	.enable = regulator_enable_regmap,
110	.disable = hi655x_disable,
111	.is_enabled = hi655x_is_enabled,
112	.list_voltage = regulator_list_voltage_linear,
113	.get_voltage_sel = regulator_get_voltage_sel_regmap,
114	.set_voltage_sel = regulator_set_voltage_sel_regmap,
115};
116
117#define HI655X_LDO(_ID, vreg, vmask, ereg, dreg,                 \
118		   sreg, cmask, vtable) {                        \
119	.rdesc = {                                               \
120		.name            = #_ID,                         \
121		.of_match        = of_match_ptr(#_ID),           \
122		.ops             = &hi655x_regulator_ops,        \
123		.regulators_node = of_match_ptr("regulators"),   \
124		.type            = REGULATOR_VOLTAGE,            \
125		.id              = HI655X_##_ID,                 \
126		.owner           = THIS_MODULE,                  \
127		.n_voltages      = ARRAY_SIZE(vtable),           \
128		.volt_table      = vtable,                       \
129		.vsel_reg        = HI655X_BUS_ADDR(vreg),        \
130		.vsel_mask       = vmask,                        \
131		.enable_reg      = HI655X_BUS_ADDR(ereg),        \
132		.enable_mask     = BIT(cmask),                   \
133	},                                                       \
134	.disable_reg = HI655X_BUS_ADDR(dreg),                    \
135	.status_reg = HI655X_BUS_ADDR(sreg),                     \
136	.ctrl_mask = cmask,                                      \
137}
138
139#define HI655X_LDO_LINEAR(_ID, vreg, vmask, ereg, dreg,          \
140			  sreg, cmask, minv, nvolt, vstep) {     \
141	.rdesc = {                                               \
142		.name            = #_ID,                         \
143		.of_match        = of_match_ptr(#_ID),           \
144		.ops             = &hi655x_ldo_linear_ops,       \
145		.regulators_node = of_match_ptr("regulators"),   \
146		.type            = REGULATOR_VOLTAGE,            \
147		.id              = HI655X_##_ID,                 \
148		.owner           = THIS_MODULE,                  \
149		.min_uV          = minv,                         \
150		.n_voltages      = nvolt,                        \
151		.uV_step         = vstep,                        \
152		.vsel_reg        = HI655X_BUS_ADDR(vreg),        \
153		.vsel_mask       = vmask,                        \
154		.enable_reg      = HI655X_BUS_ADDR(ereg),        \
155		.enable_mask     = BIT(cmask),                   \
156	},                                                       \
157	.disable_reg = HI655X_BUS_ADDR(dreg),                    \
158	.status_reg = HI655X_BUS_ADDR(sreg),                     \
159	.ctrl_mask = cmask,                                      \
160}
161
162static struct hi655x_regulator regulators[] = {
163	HI655X_LDO_LINEAR(LDO2, 0x72, 0x07, 0x29, 0x2a, 0x2b, 0x01,
164			  2500000, 8, 100000),
165	HI655X_LDO(LDO7, 0x78, 0x07, 0x29, 0x2a, 0x2b, 0x06, ldo7_voltages),
166	HI655X_LDO(LDO10, 0x78, 0x07, 0x29, 0x2a, 0x2b, 0x01, ldo7_voltages),
167	HI655X_LDO_LINEAR(LDO13, 0x7e, 0x07, 0x2c, 0x2d, 0x2e, 0x04,
168			  1600000, 8, 50000),
169	HI655X_LDO_LINEAR(LDO14, 0x7f, 0x07, 0x2c, 0x2d, 0x2e, 0x05,
170			  2500000, 8, 100000),
171	HI655X_LDO_LINEAR(LDO15, 0x80, 0x07, 0x2c, 0x2d, 0x2e, 0x06,
172			  1600000, 8, 50000),
173	HI655X_LDO_LINEAR(LDO17, 0x82, 0x07, 0x2f, 0x30, 0x31, 0x00,
174			  2500000, 8, 100000),
175	HI655X_LDO(LDO19, 0x84, 0x07, 0x2f, 0x30, 0x31, 0x02, ldo19_voltages),
176	HI655X_LDO_LINEAR(LDO21, 0x86, 0x07, 0x2f, 0x30, 0x31, 0x04,
177			  1650000, 8, 50000),
178	HI655X_LDO(LDO22, 0x87, 0x07, 0x2f, 0x30, 0x31, 0x05, ldo22_voltages),
179};
180
181static int hi655x_regulator_probe(struct platform_device *pdev)
182{
183	unsigned int i;
184	struct hi655x_regulator *regulator;
185	struct hi655x_pmic *pmic;
186	struct regulator_config config = { };
187	struct regulator_dev *rdev;
188
189	pmic = dev_get_drvdata(pdev->dev.parent);
190	if (!pmic) {
191		dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
192		return -ENODEV;
193	}
194
195	regulator = devm_kzalloc(&pdev->dev, sizeof(*regulator), GFP_KERNEL);
196	if (!regulator)
197		return -ENOMEM;
198
199	platform_set_drvdata(pdev, regulator);
200
201	config.dev = pdev->dev.parent;
202	config.regmap = pmic->regmap;
203	config.driver_data = regulator;
204	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
205		rdev = devm_regulator_register(&pdev->dev,
206					       &regulators[i].rdesc,
207					       &config);
208		if (IS_ERR(rdev)) {
209			dev_err(&pdev->dev, "failed to register regulator %s\n",
210				regulator->rdesc.name);
211			return PTR_ERR(rdev);
212		}
213	}
214	return 0;
215}
216
217static struct platform_driver hi655x_regulator_driver = {
218	.driver = {
219		.name	= "hi655x-regulator",
220	},
221	.probe	= hi655x_regulator_probe,
222};
223module_platform_driver(hi655x_regulator_driver);
224
225MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
226MODULE_DESCRIPTION("Hisilicon Hi655x regulator driver");
227MODULE_LICENSE("GPL v2");