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Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +08001/*
2 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
3 */
4
5/*
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
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 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21#include <linux/slab.h>
22#include <linux/device.h>
23#include <linux/module.h>
Dong Aishengbaa64152012-09-05 10:57:15 +080024#include <linux/mfd/syscon.h>
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080025#include <linux/err.h>
26#include <linux/io.h>
27#include <linux/platform_device.h>
28#include <linux/of.h>
29#include <linux/of_address.h>
Dong Aishengbaa64152012-09-05 10:57:15 +080030#include <linux/regmap.h>
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080031#include <linux/regulator/driver.h>
32#include <linux/regulator/of_regulator.h>
33
Anson Huang9ee417c2013-01-31 11:23:53 -050034#define LDO_RAMP_UP_UNIT_IN_CYCLES 64 /* 64 cycles per step */
35#define LDO_RAMP_UP_FREQ_IN_MHZ 24 /* cycle based on 24M OSC */
36
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080037struct anatop_regulator {
38 const char *name;
39 u32 control_reg;
Dong Aishengbaa64152012-09-05 10:57:15 +080040 struct regmap *anatop;
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080041 int vol_bit_shift;
42 int vol_bit_width;
Anson Huang9ee417c2013-01-31 11:23:53 -050043 u32 delay_reg;
44 int delay_bit_shift;
45 int delay_bit_width;
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080046 int min_bit_val;
47 int min_voltage;
48 int max_voltage;
49 struct regulator_desc rdesc;
50 struct regulator_init_data *initdata;
51};
52
Dong Aishengbaa64152012-09-05 10:57:15 +080053static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
54 unsigned selector)
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080055{
56 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080057
58 if (!anatop_reg->control_reg)
59 return -ENOTSUPP;
60
Axel Line1b01442012-12-09 08:07:43 +080061 return regulator_set_voltage_sel_regmap(reg, selector);
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080062}
63
Anson Huang9ee417c2013-01-31 11:23:53 -050064static int anatop_regmap_set_voltage_time_sel(struct regulator_dev *reg,
65 unsigned int old_sel,
66 unsigned int new_sel)
67{
68 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
69 u32 val;
70 int ret = 0;
71
72 /* check whether need to care about LDO ramp up speed */
73 if (anatop_reg->delay_bit_width && new_sel > old_sel) {
74 /*
75 * the delay for LDO ramp up time is
76 * based on the register setting, we need
77 * to calculate how many steps LDO need to
78 * ramp up, and how much delay needed. (us)
79 */
80 regmap_read(anatop_reg->anatop, anatop_reg->delay_reg, &val);
81 val = (val >> anatop_reg->delay_bit_shift) &
82 ((1 << anatop_reg->delay_bit_width) - 1);
Shawn Guoff1ce052013-02-04 10:21:32 +080083 ret = (new_sel - old_sel) * (LDO_RAMP_UP_UNIT_IN_CYCLES <<
84 val) / LDO_RAMP_UP_FREQ_IN_MHZ + 1;
Anson Huang9ee417c2013-01-31 11:23:53 -050085 }
86
87 return ret;
88}
89
Dong Aishengbaa64152012-09-05 10:57:15 +080090static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080091{
92 struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080093
94 if (!anatop_reg->control_reg)
95 return -ENOTSUPP;
96
Axel Line1b01442012-12-09 08:07:43 +080097 return regulator_get_voltage_sel_regmap(reg);
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +080098}
99
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800100static struct regulator_ops anatop_rops = {
Dong Aishengbaa64152012-09-05 10:57:15 +0800101 .set_voltage_sel = anatop_regmap_set_voltage_sel,
Anson Huang9ee417c2013-01-31 11:23:53 -0500102 .set_voltage_time_sel = anatop_regmap_set_voltage_time_sel,
Dong Aishengbaa64152012-09-05 10:57:15 +0800103 .get_voltage_sel = anatop_regmap_get_voltage_sel,
Axel Lind01c3a12012-06-03 23:02:34 +0800104 .list_voltage = regulator_list_voltage_linear,
105 .map_voltage = regulator_map_voltage_linear,
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800106};
107
Bill Pembertona5023572012-11-19 13:22:22 -0500108static int anatop_regulator_probe(struct platform_device *pdev)
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800109{
110 struct device *dev = &pdev->dev;
111 struct device_node *np = dev->of_node;
Dong Aishengbaa64152012-09-05 10:57:15 +0800112 struct device_node *anatop_np;
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800113 struct regulator_desc *rdesc;
114 struct regulator_dev *rdev;
115 struct anatop_regulator *sreg;
116 struct regulator_init_data *initdata;
Axel Lind914d812012-04-10 22:45:01 +0800117 struct regulator_config config = { };
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800118 int ret = 0;
119
120 initdata = of_get_regulator_init_data(dev, np);
121 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
122 if (!sreg)
123 return -ENOMEM;
124 sreg->initdata = initdata;
125 sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
126 GFP_KERNEL);
127 rdesc = &sreg->rdesc;
128 memset(rdesc, 0, sizeof(*rdesc));
129 rdesc->name = sreg->name;
130 rdesc->ops = &anatop_rops;
131 rdesc->type = REGULATOR_VOLTAGE;
132 rdesc->owner = THIS_MODULE;
Dong Aishengbaa64152012-09-05 10:57:15 +0800133
134 anatop_np = of_get_parent(np);
135 if (!anatop_np)
136 return -ENODEV;
137 sreg->anatop = syscon_node_to_regmap(anatop_np);
138 of_node_put(anatop_np);
139 if (IS_ERR(sreg->anatop))
140 return PTR_ERR(sreg->anatop);
141
Ying-Chun Liu (PaulLiu)2f2cc272012-03-27 15:54:01 +0800142 ret = of_property_read_u32(np, "anatop-reg-offset",
143 &sreg->control_reg);
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800144 if (ret) {
Ying-Chun Liu (PaulLiu)2f2cc272012-03-27 15:54:01 +0800145 dev_err(dev, "no anatop-reg-offset property set\n");
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800146 goto anatop_probe_end;
147 }
148 ret = of_property_read_u32(np, "anatop-vol-bit-width",
149 &sreg->vol_bit_width);
150 if (ret) {
151 dev_err(dev, "no anatop-vol-bit-width property set\n");
152 goto anatop_probe_end;
153 }
154 ret = of_property_read_u32(np, "anatop-vol-bit-shift",
155 &sreg->vol_bit_shift);
156 if (ret) {
157 dev_err(dev, "no anatop-vol-bit-shift property set\n");
158 goto anatop_probe_end;
159 }
160 ret = of_property_read_u32(np, "anatop-min-bit-val",
161 &sreg->min_bit_val);
162 if (ret) {
163 dev_err(dev, "no anatop-min-bit-val property set\n");
164 goto anatop_probe_end;
165 }
166 ret = of_property_read_u32(np, "anatop-min-voltage",
167 &sreg->min_voltage);
168 if (ret) {
169 dev_err(dev, "no anatop-min-voltage property set\n");
170 goto anatop_probe_end;
171 }
172 ret = of_property_read_u32(np, "anatop-max-voltage",
173 &sreg->max_voltage);
174 if (ret) {
175 dev_err(dev, "no anatop-max-voltage property set\n");
176 goto anatop_probe_end;
177 }
178
Anson Huang9ee417c2013-01-31 11:23:53 -0500179 /* read LDO ramp up setting, only for core reg */
180 of_property_read_u32(np, "anatop-delay-reg-offset",
181 &sreg->delay_reg);
182 of_property_read_u32(np, "anatop-delay-bit-width",
183 &sreg->delay_bit_width);
184 of_property_read_u32(np, "anatop-delay-bit-shift",
185 &sreg->delay_bit_shift);
186
Axel Lin985884d2012-12-09 08:05:45 +0800187 rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1
188 + sreg->min_bit_val;
Axel Lin0713e6a2012-05-14 11:06:44 +0800189 rdesc->min_uV = sreg->min_voltage;
190 rdesc->uV_step = 25000;
Axel Lin985884d2012-12-09 08:05:45 +0800191 rdesc->linear_min_sel = sreg->min_bit_val;
Axel Line1b01442012-12-09 08:07:43 +0800192 rdesc->vsel_reg = sreg->control_reg;
193 rdesc->vsel_mask = ((1 << sreg->vol_bit_width) - 1) <<
194 sreg->vol_bit_shift;
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800195
Axel Lind914d812012-04-10 22:45:01 +0800196 config.dev = &pdev->dev;
197 config.init_data = initdata;
198 config.driver_data = sreg;
199 config.of_node = pdev->dev.of_node;
Axel Line1b01442012-12-09 08:07:43 +0800200 config.regmap = sreg->anatop;
Axel Lind914d812012-04-10 22:45:01 +0800201
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800202 /* register regulator */
Axel Lind914d812012-04-10 22:45:01 +0800203 rdev = regulator_register(rdesc, &config);
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800204 if (IS_ERR(rdev)) {
205 dev_err(dev, "failed to register %s\n",
206 rdesc->name);
207 ret = PTR_ERR(rdev);
208 goto anatop_probe_end;
209 }
210
211 platform_set_drvdata(pdev, rdev);
212
213anatop_probe_end:
214 if (ret)
215 kfree(sreg->name);
216
217 return ret;
218}
219
Bill Pemberton8dc995f2012-11-19 13:26:10 -0500220static int anatop_regulator_remove(struct platform_device *pdev)
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800221{
222 struct regulator_dev *rdev = platform_get_drvdata(pdev);
223 struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
224 const char *name = sreg->name;
225
226 regulator_unregister(rdev);
227 kfree(name);
228
229 return 0;
230}
231
Greg Kroah-Hartman3d68dfe2012-12-21 13:26:06 -0800232static struct of_device_id of_anatop_regulator_match_tbl[] = {
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800233 { .compatible = "fsl,anatop-regulator", },
234 { /* end */ }
235};
236
Shawn Guoc0d78c22012-04-02 14:57:01 +0800237static struct platform_driver anatop_regulator_driver = {
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800238 .driver = {
239 .name = "anatop_regulator",
240 .owner = THIS_MODULE,
241 .of_match_table = of_anatop_regulator_match_tbl,
242 },
243 .probe = anatop_regulator_probe,
Bill Pemberton5eb9f2b2012-11-19 13:20:42 -0500244 .remove = anatop_regulator_remove,
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800245};
246
247static int __init anatop_regulator_init(void)
248{
Shawn Guoc0d78c22012-04-02 14:57:01 +0800249 return platform_driver_register(&anatop_regulator_driver);
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800250}
251postcore_initcall(anatop_regulator_init);
252
253static void __exit anatop_regulator_exit(void)
254{
Shawn Guoc0d78c22012-04-02 14:57:01 +0800255 platform_driver_unregister(&anatop_regulator_driver);
Ying-Chun Liu (PaulLiu)e3e5aff2012-03-14 10:29:12 +0800256}
257module_exit(anatop_regulator_exit);
258
259MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
260 "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
261MODULE_DESCRIPTION("ANATOP Regulator driver");
262MODULE_LICENSE("GPL v2");