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Linux/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 = of_get_property(np, "regulator-name", NULL);
126         rdesc = &sreg->rdesc;
127         rdesc->name = sreg->name;
128         rdesc->ops = &anatop_rops;
129         rdesc->type = REGULATOR_VOLTAGE;
130         rdesc->owner = THIS_MODULE;
131 
132         anatop_np = of_get_parent(np);
133         if (!anatop_np)
134                 return -ENODEV;
135         sreg->anatop = syscon_node_to_regmap(anatop_np);
136         of_node_put(anatop_np);
137         if (IS_ERR(sreg->anatop))
138                 return PTR_ERR(sreg->anatop);
139 
140         ret = of_property_read_u32(np, "anatop-reg-offset",
141                                    &sreg->control_reg);
142         if (ret) {
143                 dev_err(dev, "no anatop-reg-offset property set\n");
144                 return ret;
145         }
146         ret = of_property_read_u32(np, "anatop-vol-bit-width",
147                                    &sreg->vol_bit_width);
148         if (ret) {
149                 dev_err(dev, "no anatop-vol-bit-width property set\n");
150                 return ret;
151         }
152         ret = of_property_read_u32(np, "anatop-vol-bit-shift",
153                                    &sreg->vol_bit_shift);
154         if (ret) {
155                 dev_err(dev, "no anatop-vol-bit-shift property set\n");
156                 return ret;
157         }
158         ret = of_property_read_u32(np, "anatop-min-bit-val",
159                                    &sreg->min_bit_val);
160         if (ret) {
161                 dev_err(dev, "no anatop-min-bit-val property set\n");
162                 return ret;
163         }
164         ret = of_property_read_u32(np, "anatop-min-voltage",
165                                    &sreg->min_voltage);
166         if (ret) {
167                 dev_err(dev, "no anatop-min-voltage property set\n");
168                 return ret;
169         }
170         ret = of_property_read_u32(np, "anatop-max-voltage",
171                                    &sreg->max_voltage);
172         if (ret) {
173                 dev_err(dev, "no anatop-max-voltage property set\n");
174                 return ret;
175         }
176 
177         /* read LDO ramp up setting, only for core reg */
178         of_property_read_u32(np, "anatop-delay-reg-offset",
179                              &sreg->delay_reg);
180         of_property_read_u32(np, "anatop-delay-bit-width",
181                              &sreg->delay_bit_width);
182         of_property_read_u32(np, "anatop-delay-bit-shift",
183                              &sreg->delay_bit_shift);
184 
185         rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage) / 25000 + 1
186                             + sreg->min_bit_val;
187         rdesc->min_uV = sreg->min_voltage;
188         rdesc->uV_step = 25000;
189         rdesc->linear_min_sel = sreg->min_bit_val;
190         rdesc->vsel_reg = sreg->control_reg;
191         rdesc->vsel_mask = ((1 << sreg->vol_bit_width) - 1) <<
192                            sreg->vol_bit_shift;
193 
194         config.dev = &pdev->dev;
195         config.init_data = initdata;
196         config.driver_data = sreg;
197         config.of_node = pdev->dev.of_node;
198         config.regmap = sreg->anatop;
199 
200         /* register regulator */
201         rdev = devm_regulator_register(dev, rdesc, &config);
202         if (IS_ERR(rdev)) {
203                 dev_err(dev, "failed to register %s\n",
204                         rdesc->name);
205                 return PTR_ERR(rdev);
206         }
207 
208         platform_set_drvdata(pdev, rdev);
209 
210         return 0;
211 }
212 
213 static struct of_device_id of_anatop_regulator_match_tbl[] = {
214         { .compatible = "fsl,anatop-regulator", },
215         { /* end */ }
216 };
217 
218 static struct platform_driver anatop_regulator_driver = {
219         .driver = {
220                 .name   = "anatop_regulator",
221                 .owner  = THIS_MODULE,
222                 .of_match_table = of_anatop_regulator_match_tbl,
223         },
224         .probe  = anatop_regulator_probe,
225 };
226 
227 static int __init anatop_regulator_init(void)
228 {
229         return platform_driver_register(&anatop_regulator_driver);
230 }
231 postcore_initcall(anatop_regulator_init);
232 
233 static void __exit anatop_regulator_exit(void)
234 {
235         platform_driver_unregister(&anatop_regulator_driver);
236 }
237 module_exit(anatop_regulator_exit);
238 
239 MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>");
240 MODULE_AUTHOR("Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
241 MODULE_DESCRIPTION("ANATOP Regulator driver");
242 MODULE_LICENSE("GPL v2");
243 MODULE_ALIAS("platform:anatop_regulator");
244 

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