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1 | /* |
2 | * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies |
3 | * |
4 | * Copyright (C) 2012 Renesas Electronics Corporation |
5 | * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de> |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the version 2 of the GNU General Public License as |
9 | * published by the Free Software Foundation |
10 | */ |
11 | |
12 | #include <linux/err.h> |
13 | #include <linux/init.h> |
14 | #include <linux/mfd/as3711.h> |
15 | #include <linux/module.h> |
16 | #include <linux/platform_device.h> |
17 | #include <linux/regmap.h> |
18 | #include <linux/regulator/driver.h> |
19 | #include <linux/slab.h> |
20 | |
21 | struct as3711_regulator_info { |
22 | struct regulator_desc desc; |
23 | unsigned int max_uV; |
24 | }; |
25 | |
26 | struct as3711_regulator { |
27 | struct as3711_regulator_info *reg_info; |
28 | struct regulator_dev *rdev; |
29 | }; |
30 | |
31 | static int as3711_list_voltage_sd(struct regulator_dev *rdev, |
32 | unsigned int selector) |
33 | { |
34 | if (selector >= rdev->desc->n_voltages) |
35 | return -EINVAL; |
36 | |
37 | if (!selector) |
38 | return 0; |
39 | if (selector < 0x41) |
40 | return 600000 + selector * 12500; |
41 | if (selector < 0x71) |
42 | return 1400000 + (selector - 0x40) * 25000; |
43 | return 2600000 + (selector - 0x70) * 50000; |
44 | } |
45 | |
46 | static int as3711_list_voltage_aldo(struct regulator_dev *rdev, |
47 | unsigned int selector) |
48 | { |
49 | if (selector >= rdev->desc->n_voltages) |
50 | return -EINVAL; |
51 | |
52 | if (selector < 0x10) |
53 | return 1200000 + selector * 50000; |
54 | return 1800000 + (selector - 0x10) * 100000; |
55 | } |
56 | |
57 | static int as3711_list_voltage_dldo(struct regulator_dev *rdev, |
58 | unsigned int selector) |
59 | { |
60 | if (selector >= rdev->desc->n_voltages || |
61 | (selector > 0x10 && selector < 0x20)) |
62 | return -EINVAL; |
63 | |
64 | if (selector < 0x11) |
65 | return 900000 + selector * 50000; |
66 | return 1750000 + (selector - 0x20) * 50000; |
67 | } |
68 | |
69 | static int as3711_bound_check(struct regulator_dev *rdev, |
70 | int *min_uV, int *max_uV) |
71 | { |
72 | struct as3711_regulator *reg = rdev_get_drvdata(rdev); |
73 | struct as3711_regulator_info *info = reg->reg_info; |
74 | |
75 | dev_dbg(&rdev->dev, "%s(), %d, %d, %d\n", __func__, |
76 | *min_uV, rdev->desc->min_uV, info->max_uV); |
77 | |
78 | if (*max_uV < *min_uV || |
79 | *min_uV > info->max_uV || rdev->desc->min_uV > *max_uV) |
80 | return -EINVAL; |
81 | |
82 | if (rdev->desc->n_voltages == 1) |
83 | return 0; |
84 | |
85 | if (*max_uV > info->max_uV) |
86 | *max_uV = info->max_uV; |
87 | |
88 | if (*min_uV < rdev->desc->min_uV) |
89 | *min_uV = rdev->desc->min_uV; |
90 | |
91 | return *min_uV; |
92 | } |
93 | |
94 | static int as3711_sel_check(int min, int max, int bottom, int step) |
95 | { |
96 | int sel, voltage; |
97 | |
98 | /* Round up min, when dividing: keeps us within the range */ |
99 | sel = DIV_ROUND_UP(min - bottom, step); |
100 | voltage = sel * step + bottom; |
101 | pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__, |
102 | min, max, bottom, step, sel); |
103 | if (voltage > max) |
104 | return -EINVAL; |
105 | |
106 | return sel; |
107 | } |
108 | |
109 | static int as3711_map_voltage_sd(struct regulator_dev *rdev, |
110 | int min_uV, int max_uV) |
111 | { |
112 | int ret; |
113 | |
114 | ret = as3711_bound_check(rdev, &min_uV, &max_uV); |
115 | if (ret <= 0) |
116 | return ret; |
117 | |
118 | if (min_uV <= 1400000) |
119 | return as3711_sel_check(min_uV, max_uV, 600000, 12500); |
120 | |
121 | if (min_uV <= 2600000) |
122 | return as3711_sel_check(min_uV, max_uV, 1400000, 25000) + 0x40; |
123 | |
124 | return as3711_sel_check(min_uV, max_uV, 2600000, 50000) + 0x70; |
125 | } |
126 | |
127 | /* |
128 | * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and |
129 | * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes: |
130 | * FAST: sdX_fast=1 |
131 | * NORMAL: low_noise=1 |
132 | * IDLE: low_noise=0 |
133 | */ |
134 | |
135 | static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode) |
136 | { |
137 | unsigned int fast_bit = rdev->desc->enable_mask, |
138 | low_noise_bit = fast_bit << 4; |
139 | u8 val; |
140 | |
141 | switch (mode) { |
142 | case REGULATOR_MODE_FAST: |
143 | val = fast_bit | low_noise_bit; |
144 | break; |
145 | case REGULATOR_MODE_NORMAL: |
146 | val = low_noise_bit; |
147 | break; |
148 | case REGULATOR_MODE_IDLE: |
149 | val = 0; |
150 | break; |
151 | default: |
152 | return -EINVAL; |
153 | } |
154 | |
155 | return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1, |
156 | low_noise_bit | fast_bit, val); |
157 | } |
158 | |
159 | static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev) |
160 | { |
161 | unsigned int fast_bit = rdev->desc->enable_mask, |
162 | low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit; |
163 | unsigned int val; |
164 | int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val); |
165 | |
166 | if (ret < 0) |
167 | return ret; |
168 | |
169 | if ((val & mask) == mask) |
170 | return REGULATOR_MODE_FAST; |
171 | |
172 | if ((val & mask) == low_noise_bit) |
173 | return REGULATOR_MODE_NORMAL; |
174 | |
175 | if (!(val & mask)) |
176 | return REGULATOR_MODE_IDLE; |
177 | |
178 | return -EINVAL; |
179 | } |
180 | |
181 | static int as3711_map_voltage_aldo(struct regulator_dev *rdev, |
182 | int min_uV, int max_uV) |
183 | { |
184 | int ret; |
185 | |
186 | ret = as3711_bound_check(rdev, &min_uV, &max_uV); |
187 | if (ret <= 0) |
188 | return ret; |
189 | |
190 | if (min_uV <= 1800000) |
191 | return as3711_sel_check(min_uV, max_uV, 1200000, 50000); |
192 | |
193 | return as3711_sel_check(min_uV, max_uV, 1800000, 100000) + 0x10; |
194 | } |
195 | |
196 | static int as3711_map_voltage_dldo(struct regulator_dev *rdev, |
197 | int min_uV, int max_uV) |
198 | { |
199 | int ret; |
200 | |
201 | ret = as3711_bound_check(rdev, &min_uV, &max_uV); |
202 | if (ret <= 0) |
203 | return ret; |
204 | |
205 | if (min_uV <= 1700000) |
206 | return as3711_sel_check(min_uV, max_uV, 900000, 50000); |
207 | |
208 | return as3711_sel_check(min_uV, max_uV, 1750000, 50000) + 0x20; |
209 | } |
210 | |
211 | static struct regulator_ops as3711_sd_ops = { |
212 | .is_enabled = regulator_is_enabled_regmap, |
213 | .enable = regulator_enable_regmap, |
214 | .disable = regulator_disable_regmap, |
215 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
216 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
217 | .list_voltage = as3711_list_voltage_sd, |
218 | .map_voltage = as3711_map_voltage_sd, |
219 | .get_mode = as3711_get_mode_sd, |
220 | .set_mode = as3711_set_mode_sd, |
221 | }; |
222 | |
223 | static struct regulator_ops as3711_aldo_ops = { |
224 | .is_enabled = regulator_is_enabled_regmap, |
225 | .enable = regulator_enable_regmap, |
226 | .disable = regulator_disable_regmap, |
227 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
228 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
229 | .list_voltage = as3711_list_voltage_aldo, |
230 | .map_voltage = as3711_map_voltage_aldo, |
231 | }; |
232 | |
233 | static struct regulator_ops as3711_dldo_ops = { |
234 | .is_enabled = regulator_is_enabled_regmap, |
235 | .enable = regulator_enable_regmap, |
236 | .disable = regulator_disable_regmap, |
237 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
238 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
239 | .list_voltage = as3711_list_voltage_dldo, |
240 | .map_voltage = as3711_map_voltage_dldo, |
241 | }; |
242 | |
243 | #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx) \ |
244 | [AS3711_REGULATOR_ ## _id] = { \ |
245 | .desc = { \ |
246 | .name = "as3711-regulator-" # _id, \ |
247 | .id = AS3711_REGULATOR_ ## _id, \ |
248 | .n_voltages = (_vmask + 1), \ |
249 | .ops = &as3711_ ## _sfx ## _ops, \ |
250 | .type = REGULATOR_VOLTAGE, \ |
251 | .owner = THIS_MODULE, \ |
252 | .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \ |
253 | .vsel_mask = _vmask << _vshift, \ |
254 | .enable_reg = AS3711_ ## _en_reg, \ |
255 | .enable_mask = BIT(_en_bit), \ |
256 | .min_uV = _min_uV, \ |
257 | }, \ |
258 | .max_uV = _max_uV, \ |
259 | } |
260 | |
261 | static struct as3711_regulator_info as3711_reg_info[] = { |
262 | AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd), |
263 | AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd), |
264 | AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd), |
265 | AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd), |
266 | AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo), |
267 | AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo), |
268 | AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), |
269 | AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), |
270 | AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), |
271 | AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), |
272 | AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), |
273 | AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), |
274 | /* StepUp output voltage depends on supplying regulator */ |
275 | }; |
276 | |
277 | #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info) |
278 | |
279 | static int as3711_regulator_probe(struct platform_device *pdev) |
280 | { |
281 | struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev); |
282 | struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent); |
283 | struct regulator_init_data *reg_data; |
284 | struct regulator_config config = {.dev = &pdev->dev,}; |
285 | struct as3711_regulator *reg = NULL; |
286 | struct as3711_regulator *regs; |
287 | struct regulator_dev *rdev; |
288 | struct as3711_regulator_info *ri; |
289 | int ret; |
290 | int id; |
291 | |
292 | if (!pdata) |
293 | dev_dbg(&pdev->dev, "No platform data...\n"); |
294 | |
295 | regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM * |
296 | sizeof(struct as3711_regulator), GFP_KERNEL); |
297 | if (!regs) { |
298 | dev_err(&pdev->dev, "Memory allocation failed exiting..\n"); |
299 | return -ENOMEM; |
300 | } |
301 | |
302 | for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) { |
303 | reg_data = pdata ? pdata->init_data[id] : NULL; |
304 | |
305 | /* No need to register if there is no regulator data */ |
306 | if (!reg_data) |
307 | continue; |
308 | |
309 | reg = ®s[id]; |
310 | reg->reg_info = ri; |
311 | |
312 | config.init_data = reg_data; |
313 | config.driver_data = reg; |
314 | config.regmap = as3711->regmap; |
315 | |
316 | rdev = regulator_register(&ri->desc, &config); |
317 | if (IS_ERR(rdev)) { |
318 | dev_err(&pdev->dev, "Failed to register regulator %s\n", |
319 | ri->desc.name); |
320 | ret = PTR_ERR(rdev); |
321 | goto eregreg; |
322 | } |
323 | reg->rdev = rdev; |
324 | } |
325 | platform_set_drvdata(pdev, regs); |
326 | return 0; |
327 | |
328 | eregreg: |
329 | while (--id >= 0) |
330 | regulator_unregister(regs[id].rdev); |
331 | |
332 | return ret; |
333 | } |
334 | |
335 | static int as3711_regulator_remove(struct platform_device *pdev) |
336 | { |
337 | struct as3711_regulator *regs = platform_get_drvdata(pdev); |
338 | int id; |
339 | |
340 | for (id = 0; id < AS3711_REGULATOR_NUM; ++id) |
341 | regulator_unregister(regs[id].rdev); |
342 | return 0; |
343 | } |
344 | |
345 | static struct platform_driver as3711_regulator_driver = { |
346 | .driver = { |
347 | .name = "as3711-regulator", |
348 | .owner = THIS_MODULE, |
349 | }, |
350 | .probe = as3711_regulator_probe, |
351 | .remove = as3711_regulator_remove, |
352 | }; |
353 | |
354 | static int __init as3711_regulator_init(void) |
355 | { |
356 | return platform_driver_register(&as3711_regulator_driver); |
357 | } |
358 | subsys_initcall(as3711_regulator_init); |
359 | |
360 | static void __exit as3711_regulator_exit(void) |
361 | { |
362 | platform_driver_unregister(&as3711_regulator_driver); |
363 | } |
364 | module_exit(as3711_regulator_exit); |
365 | |
366 | MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); |
367 | MODULE_DESCRIPTION("AS3711 regulator driver"); |
368 | MODULE_ALIAS("platform:as3711-regulator"); |
369 | MODULE_LICENSE("GPL v2"); |
370 |
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