regulators: anatop: add set_voltage_time_sel interface
[~shefty/rdma-dev.git] / drivers / regulator / anatop-regulator.c
1 /*
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>
24 #include <linux/mfd/syscon.h>
25 #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>
30 #include <linux/regmap.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/of_regulator.h>
33
34 #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
37 struct anatop_regulator {
38         const char *name;
39         u32 control_reg;
40         struct regmap *anatop;
41         int vol_bit_shift;
42         int vol_bit_width;
43         u32 delay_reg;
44         int delay_bit_shift;
45         int delay_bit_width;
46         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
53 static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
54                                         unsigned selector)
55 {
56         struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
57
58         if (!anatop_reg->control_reg)
59                 return -ENOTSUPP;
60
61         return regulator_set_voltage_sel_regmap(reg, selector);
62 }
63
64 static 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);
83                 ret = (new_sel - old_sel) * ((LDO_RAMP_UP_UNIT_IN_CYCLES <<
84                         val) / LDO_RAMP_UP_FREQ_IN_MHZ + 1);
85         }
86
87         return ret;
88 }
89
90 static int anatop_regmap_get_voltage_sel(struct regulator_dev *reg)
91 {
92         struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
93
94         if (!anatop_reg->control_reg)
95                 return -ENOTSUPP;
96
97         return regulator_get_voltage_sel_regmap(reg);
98 }
99
100 static struct regulator_ops anatop_rops = {
101         .set_voltage_sel = anatop_regmap_set_voltage_sel,
102         .set_voltage_time_sel = anatop_regmap_set_voltage_time_sel,
103         .get_voltage_sel = anatop_regmap_get_voltage_sel,
104         .list_voltage = regulator_list_voltage_linear,
105         .map_voltage = regulator_map_voltage_linear,
106 };
107
108 static int anatop_regulator_probe(struct platform_device *pdev)
109 {
110         struct device *dev = &pdev->dev;
111         struct device_node *np = dev->of_node;
112         struct device_node *anatop_np;
113         struct regulator_desc *rdesc;
114         struct regulator_dev *rdev;
115         struct anatop_regulator *sreg;
116         struct regulator_init_data *initdata;
117         struct regulator_config config = { };
118         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;
133
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
142         ret = of_property_read_u32(np, "anatop-reg-offset",
143                                    &sreg->control_reg);
144         if (ret) {
145                 dev_err(dev, "no anatop-reg-offset property set\n");
146                 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
179         /* 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
187         rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1
188                             + sreg->min_bit_val;
189         rdesc->min_uV = sreg->min_voltage;
190         rdesc->uV_step = 25000;
191         rdesc->linear_min_sel = sreg->min_bit_val;
192         rdesc->vsel_reg = sreg->control_reg;
193         rdesc->vsel_mask = ((1 << sreg->vol_bit_width) - 1) <<
194                            sreg->vol_bit_shift;
195
196         config.dev = &pdev->dev;
197         config.init_data = initdata;
198         config.driver_data = sreg;
199         config.of_node = pdev->dev.of_node;
200         config.regmap = sreg->anatop;
201
202         /* register regulator */
203         rdev = regulator_register(rdesc, &config);
204         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
213 anatop_probe_end:
214         if (ret)
215                 kfree(sreg->name);
216
217         return ret;
218 }
219
220 static int anatop_regulator_remove(struct platform_device *pdev)
221 {
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
232 static struct of_device_id of_anatop_regulator_match_tbl[] = {
233         { .compatible = "fsl,anatop-regulator", },
234         { /* end */ }
235 };
236
237 static struct platform_driver anatop_regulator_driver = {
238         .driver = {
239                 .name   = "anatop_regulator",
240                 .owner  = THIS_MODULE,
241                 .of_match_table = of_anatop_regulator_match_tbl,
242         },
243         .probe  = anatop_regulator_probe,
244         .remove = anatop_regulator_remove,
245 };
246
247 static int __init anatop_regulator_init(void)
248 {
249         return platform_driver_register(&anatop_regulator_driver);
250 }
251 postcore_initcall(anatop_regulator_init);
252
253 static void __exit anatop_regulator_exit(void)
254 {
255         platform_driver_unregister(&anatop_regulator_driver);
256 }
257 module_exit(anatop_regulator_exit);
258
259 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
260               "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
261 MODULE_DESCRIPTION("ANATOP Regulator driver");
262 MODULE_LICENSE("GPL v2");