tjh.dev
Linux kernel mirror (for testing)
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linux
1/*
2 * Regulator driver for TI TPS6586x
3 *
4 * Copyright (C) 2010 Compulab Ltd.
5 * Author: Mike Rapoport <mike@compulab.co.il>
6 *
7 * Based on da903x
8 * Copyright (C) 2006-2008 Marvell International Ltd.
9 * Copyright (C) 2008 Compulab Ltd.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/err.h>
20#include <linux/slab.h>
21#include <linux/platform_device.h>
22#include <linux/regulator/driver.h>
23#include <linux/regulator/machine.h>
24#include <linux/mfd/tps6586x.h>
25
26/* supply control and voltage setting */
27#define TPS6586X_SUPPLYENA 0x10
28#define TPS6586X_SUPPLYENB 0x11
29#define TPS6586X_SUPPLYENC 0x12
30#define TPS6586X_SUPPLYEND 0x13
31#define TPS6586X_SUPPLYENE 0x14
32#define TPS6586X_VCC1 0x20
33#define TPS6586X_VCC2 0x21
34#define TPS6586X_SM1V1 0x23
35#define TPS6586X_SM1V2 0x24
36#define TPS6586X_SM1SL 0x25
37#define TPS6586X_SM0V1 0x26
38#define TPS6586X_SM0V2 0x27
39#define TPS6586X_SM0SL 0x28
40#define TPS6586X_LDO2AV1 0x29
41#define TPS6586X_LDO2AV2 0x2A
42#define TPS6586X_LDO2BV1 0x2F
43#define TPS6586X_LDO2BV2 0x30
44#define TPS6586X_LDO4V1 0x32
45#define TPS6586X_LDO4V2 0x33
46
47/* converter settings */
48#define TPS6586X_SUPPLYV1 0x41
49#define TPS6586X_SUPPLYV2 0x42
50#define TPS6586X_SUPPLYV3 0x43
51#define TPS6586X_SUPPLYV4 0x44
52#define TPS6586X_SUPPLYV5 0x45
53#define TPS6586X_SUPPLYV6 0x46
54#define TPS6586X_SMODE1 0x47
55#define TPS6586X_SMODE2 0x48
56
57struct tps6586x_regulator {
58 struct regulator_desc desc;
59
60 int volt_reg;
61 int volt_shift;
62 int volt_nbits;
63 int enable_bit[2];
64 int enable_reg[2];
65
66 int *voltages;
67
68 /* for DVM regulators */
69 int go_reg;
70 int go_bit;
71};
72
73static inline struct device *to_tps6586x_dev(struct regulator_dev *rdev)
74{
75 return rdev_get_dev(rdev)->parent->parent;
76}
77
78static int tps6586x_list_voltage(struct regulator_dev *rdev, unsigned selector)
79{
80 struct tps6586x_regulator *info = rdev_get_drvdata(rdev);
81 int rid = rdev_get_id(rdev);
82
83 /* LDO0 has minimal voltage 1.2V rather than 1.25V */
84 if ((rid == TPS6586X_ID_LDO_0) && (selector == 0))
85 return (info->voltages[0] - 50) * 1000;
86
87 return info->voltages[selector] * 1000;
88}
89
90
91static int tps6586x_set_voltage_sel(struct regulator_dev *rdev,
92 unsigned selector)
93{
94 struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
95 struct device *parent = to_tps6586x_dev(rdev);
96 int ret, val, rid = rdev_get_id(rdev);
97 uint8_t mask;
98
99 val = selector << ri->volt_shift;
100 mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
101
102 ret = tps6586x_update(parent, ri->volt_reg, val, mask);
103 if (ret)
104 return ret;
105
106 /* Update go bit for DVM regulators */
107 switch (rid) {
108 case TPS6586X_ID_LDO_2:
109 case TPS6586X_ID_LDO_4:
110 case TPS6586X_ID_SM_0:
111 case TPS6586X_ID_SM_1:
112 ret = tps6586x_set_bits(parent, ri->go_reg, 1 << ri->go_bit);
113 break;
114 }
115 return ret;
116}
117
118static int tps6586x_get_voltage_sel(struct regulator_dev *rdev)
119{
120 struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
121 struct device *parent = to_tps6586x_dev(rdev);
122 uint8_t val, mask;
123 int ret;
124
125 ret = tps6586x_read(parent, ri->volt_reg, &val);
126 if (ret)
127 return ret;
128
129 mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
130 val = (val & mask) >> ri->volt_shift;
131
132 if (val >= ri->desc.n_voltages)
133 BUG();
134
135 return val;
136}
137
138static int tps6586x_regulator_enable(struct regulator_dev *rdev)
139{
140 struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
141 struct device *parent = to_tps6586x_dev(rdev);
142
143 return tps6586x_set_bits(parent, ri->enable_reg[0],
144 1 << ri->enable_bit[0]);
145}
146
147static int tps6586x_regulator_disable(struct regulator_dev *rdev)
148{
149 struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
150 struct device *parent = to_tps6586x_dev(rdev);
151
152 return tps6586x_clr_bits(parent, ri->enable_reg[0],
153 1 << ri->enable_bit[0]);
154}
155
156static int tps6586x_regulator_is_enabled(struct regulator_dev *rdev)
157{
158 struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
159 struct device *parent = to_tps6586x_dev(rdev);
160 uint8_t reg_val;
161 int ret;
162
163 ret = tps6586x_read(parent, ri->enable_reg[0], ®_val);
164 if (ret)
165 return ret;
166
167 return !!(reg_val & (1 << ri->enable_bit[0]));
168}
169
170static struct regulator_ops tps6586x_regulator_ops = {
171 .list_voltage = tps6586x_list_voltage,
172 .get_voltage_sel = tps6586x_get_voltage_sel,
173 .set_voltage_sel = tps6586x_set_voltage_sel,
174
175 .is_enabled = tps6586x_regulator_is_enabled,
176 .enable = tps6586x_regulator_enable,
177 .disable = tps6586x_regulator_disable,
178};
179
180static int tps6586x_ldo_voltages[] = {
181 1250, 1500, 1800, 2500, 2700, 2850, 3100, 3300,
182};
183
184static int tps6586x_ldo4_voltages[] = {
185 1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875,
186 1900, 1925, 1950, 1975, 2000, 2025, 2050, 2075,
187 2100, 2125, 2150, 2175, 2200, 2225, 2250, 2275,
188 2300, 2325, 2350, 2375, 2400, 2425, 2450, 2475,
189};
190
191static int tps6586x_sm2_voltages[] = {
192 3000, 3050, 3100, 3150, 3200, 3250, 3300, 3350,
193 3400, 3450, 3500, 3550, 3600, 3650, 3700, 3750,
194 3800, 3850, 3900, 3950, 4000, 4050, 4100, 4150,
195 4200, 4250, 4300, 4350, 4400, 4450, 4500, 4550,
196};
197
198static int tps6586x_dvm_voltages[] = {
199 725, 750, 775, 800, 825, 850, 875, 900,
200 925, 950, 975, 1000, 1025, 1050, 1075, 1100,
201 1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
202 1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
203};
204
205#define TPS6586X_REGULATOR(_id, vdata, vreg, shift, nbits, \
206 ereg0, ebit0, ereg1, ebit1) \
207 .desc = { \
208 .name = "REG-" #_id, \
209 .ops = &tps6586x_regulator_ops, \
210 .type = REGULATOR_VOLTAGE, \
211 .id = TPS6586X_ID_##_id, \
212 .n_voltages = ARRAY_SIZE(tps6586x_##vdata##_voltages), \
213 .owner = THIS_MODULE, \
214 }, \
215 .volt_reg = TPS6586X_##vreg, \
216 .volt_shift = (shift), \
217 .volt_nbits = (nbits), \
218 .enable_reg[0] = TPS6586X_SUPPLY##ereg0, \
219 .enable_bit[0] = (ebit0), \
220 .enable_reg[1] = TPS6586X_SUPPLY##ereg1, \
221 .enable_bit[1] = (ebit1), \
222 .voltages = tps6586x_##vdata##_voltages,
223
224#define TPS6586X_REGULATOR_DVM_GOREG(goreg, gobit) \
225 .go_reg = TPS6586X_##goreg, \
226 .go_bit = (gobit),
227
228#define TPS6586X_LDO(_id, vdata, vreg, shift, nbits, \
229 ereg0, ebit0, ereg1, ebit1) \
230{ \
231 TPS6586X_REGULATOR(_id, vdata, vreg, shift, nbits, \
232 ereg0, ebit0, ereg1, ebit1) \
233}
234
235#define TPS6586X_DVM(_id, vdata, vreg, shift, nbits, \
236 ereg0, ebit0, ereg1, ebit1, goreg, gobit) \
237{ \
238 TPS6586X_REGULATOR(_id, vdata, vreg, shift, nbits, \
239 ereg0, ebit0, ereg1, ebit1) \
240 TPS6586X_REGULATOR_DVM_GOREG(goreg, gobit) \
241}
242
243static struct tps6586x_regulator tps6586x_regulator[] = {
244 TPS6586X_LDO(LDO_0, ldo, SUPPLYV1, 5, 3, ENC, 0, END, 0),
245 TPS6586X_LDO(LDO_3, ldo, SUPPLYV4, 0, 3, ENC, 2, END, 2),
246 TPS6586X_LDO(LDO_5, ldo, SUPPLYV6, 0, 3, ENE, 6, ENE, 6),
247 TPS6586X_LDO(LDO_6, ldo, SUPPLYV3, 0, 3, ENC, 4, END, 4),
248 TPS6586X_LDO(LDO_7, ldo, SUPPLYV3, 3, 3, ENC, 5, END, 5),
249 TPS6586X_LDO(LDO_8, ldo, SUPPLYV2, 5, 3, ENC, 6, END, 6),
250 TPS6586X_LDO(LDO_9, ldo, SUPPLYV6, 3, 3, ENE, 7, ENE, 7),
251 TPS6586X_LDO(LDO_RTC, ldo, SUPPLYV4, 3, 3, V4, 7, V4, 7),
252 TPS6586X_LDO(LDO_1, dvm, SUPPLYV1, 0, 5, ENC, 1, END, 1),
253 TPS6586X_LDO(SM_2, sm2, SUPPLYV2, 0, 5, ENC, 7, END, 7),
254
255 TPS6586X_DVM(LDO_2, dvm, LDO2BV1, 0, 5, ENA, 3, ENB, 3, VCC2, 6),
256 TPS6586X_DVM(LDO_4, ldo4, LDO4V1, 0, 5, ENC, 3, END, 3, VCC1, 6),
257 TPS6586X_DVM(SM_0, dvm, SM0V1, 0, 5, ENA, 1, ENB, 1, VCC1, 2),
258 TPS6586X_DVM(SM_1, dvm, SM1V1, 0, 5, ENA, 0, ENB, 0, VCC1, 0),
259};
260
261/*
262 * TPS6586X has 2 enable bits that are OR'ed to determine the actual
263 * regulator state. Clearing one of this bits allows switching
264 * regulator on and of with single register write.
265 */
266static inline int tps6586x_regulator_preinit(struct device *parent,
267 struct tps6586x_regulator *ri)
268{
269 uint8_t val1, val2;
270 int ret;
271
272 if (ri->enable_reg[0] == ri->enable_reg[1] &&
273 ri->enable_bit[0] == ri->enable_bit[1])
274 return 0;
275
276 ret = tps6586x_read(parent, ri->enable_reg[0], &val1);
277 if (ret)
278 return ret;
279
280 ret = tps6586x_read(parent, ri->enable_reg[1], &val2);
281 if (ret)
282 return ret;
283
284 if (!(val2 & (1 << ri->enable_bit[1])))
285 return 0;
286
287 /*
288 * The regulator is on, but it's enabled with the bit we don't
289 * want to use, so we switch the enable bits
290 */
291 if (!(val1 & (1 << ri->enable_bit[0]))) {
292 ret = tps6586x_set_bits(parent, ri->enable_reg[0],
293 1 << ri->enable_bit[0]);
294 if (ret)
295 return ret;
296 }
297
298 return tps6586x_clr_bits(parent, ri->enable_reg[1],
299 1 << ri->enable_bit[1]);
300}
301
302static int tps6586x_regulator_set_slew_rate(struct platform_device *pdev)
303{
304 struct device *parent = pdev->dev.parent;
305 struct regulator_init_data *p = pdev->dev.platform_data;
306 struct tps6586x_settings *setting = p->driver_data;
307 uint8_t reg;
308
309 if (setting == NULL)
310 return 0;
311
312 if (!(setting->slew_rate & TPS6586X_SLEW_RATE_SET))
313 return 0;
314
315 /* only SM0 and SM1 can have the slew rate settings */
316 switch (pdev->id) {
317 case TPS6586X_ID_SM_0:
318 reg = TPS6586X_SM0SL;
319 break;
320 case TPS6586X_ID_SM_1:
321 reg = TPS6586X_SM1SL;
322 break;
323 default:
324 dev_warn(&pdev->dev, "Only SM0/SM1 can set slew rate\n");
325 return -EINVAL;
326 }
327
328 return tps6586x_write(parent, reg,
329 setting->slew_rate & TPS6586X_SLEW_RATE_MASK);
330}
331
332static inline struct tps6586x_regulator *find_regulator_info(int id)
333{
334 struct tps6586x_regulator *ri;
335 int i;
336
337 for (i = 0; i < ARRAY_SIZE(tps6586x_regulator); i++) {
338 ri = &tps6586x_regulator[i];
339 if (ri->desc.id == id)
340 return ri;
341 }
342 return NULL;
343}
344
345static int __devinit tps6586x_regulator_probe(struct platform_device *pdev)
346{
347 struct tps6586x_regulator *ri = NULL;
348 struct regulator_config config = { };
349 struct regulator_dev *rdev;
350 int id = pdev->id;
351 int err;
352
353 dev_dbg(&pdev->dev, "Probing regulator %d\n", id);
354
355 ri = find_regulator_info(id);
356 if (ri == NULL) {
357 dev_err(&pdev->dev, "invalid regulator ID specified\n");
358 return -EINVAL;
359 }
360
361 err = tps6586x_regulator_preinit(pdev->dev.parent, ri);
362 if (err)
363 return err;
364
365 config.dev = &pdev->dev;
366 config.of_node = pdev->dev.of_node;
367 config.init_data = pdev->dev.platform_data;
368 config.driver_data = ri;
369
370 rdev = regulator_register(&ri->desc, &config);
371 if (IS_ERR(rdev)) {
372 dev_err(&pdev->dev, "failed to register regulator %s\n",
373 ri->desc.name);
374 return PTR_ERR(rdev);
375 }
376
377 platform_set_drvdata(pdev, rdev);
378
379 return tps6586x_regulator_set_slew_rate(pdev);
380}
381
382static int __devexit tps6586x_regulator_remove(struct platform_device *pdev)
383{
384 struct regulator_dev *rdev = platform_get_drvdata(pdev);
385
386 regulator_unregister(rdev);
387 return 0;
388}
389
390static struct platform_driver tps6586x_regulator_driver = {
391 .driver = {
392 .name = "tps6586x-regulator",
393 .owner = THIS_MODULE,
394 },
395 .probe = tps6586x_regulator_probe,
396 .remove = __devexit_p(tps6586x_regulator_remove),
397};
398
399static int __init tps6586x_regulator_init(void)
400{
401 return platform_driver_register(&tps6586x_regulator_driver);
402}
403subsys_initcall(tps6586x_regulator_init);
404
405static void __exit tps6586x_regulator_exit(void)
406{
407 platform_driver_unregister(&tps6586x_regulator_driver);
408}
409module_exit(tps6586x_regulator_exit);
410
411MODULE_LICENSE("GPL");
412MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
413MODULE_DESCRIPTION("Regulator Driver for TI TPS6586X PMIC");
414MODULE_ALIAS("platform:tps6586x-regulator");