1/*
2 * tps65912.c  --  TI tps65912
3 *
4 * Copyright 2011 Texas Instruments Inc.
5 *
6 * Author: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
7 *
8 *  This program is free software; you can redistribute it and/or modify it
9 *  under  the terms of the GNU General  Public License as published by the
10 *  Free Software Foundation;  either version 2 of the License, or (at your
11 *  option) any later version.
12 *
13 * This driver is based on wm8350 implementation.
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/platform_device.h>
21#include <linux/regulator/driver.h>
22#include <linux/regulator/machine.h>
23#include <linux/slab.h>
24#include <linux/gpio.h>
25#include <linux/mfd/tps65912.h>
26
27/* DCDC's */
28#define TPS65912_REG_DCDC1	0
29#define TPS65912_REG_DCDC2	1
30#define TPS65912_REG_DCDC3	2
31#define TPS65912_REG_DCDC4	3
32
33/* LDOs */
34#define TPS65912_REG_LDO1	4
35#define TPS65912_REG_LDO2	5
36#define TPS65912_REG_LDO3	6
37#define TPS65912_REG_LDO4	7
38#define TPS65912_REG_LDO5	8
39#define TPS65912_REG_LDO6	9
40#define TPS65912_REG_LDO7	10
41#define TPS65912_REG_LDO8	11
42#define TPS65912_REG_LDO9	12
43#define TPS65912_REG_LDO10	13
44
45/* Number of step-down converters available */
46#define TPS65912_NUM_DCDC	4
47
48/* Number of LDO voltage regulators  available */
49#define TPS65912_NUM_LDO	10
50
51/* Number of total regulators available */
52#define TPS65912_NUM_REGULATOR		(TPS65912_NUM_DCDC + TPS65912_NUM_LDO)
53
54#define TPS65912_REG_ENABLED	0x80
55#define OP_SELREG_MASK		0x40
56#define OP_SELREG_SHIFT		6
57
58struct tps_info {
59	const char *name;
60};
61
62static struct tps_info tps65912_regs[] = {
63	{
64		.name = "DCDC1",
65	},
66	{
67		.name = "DCDC2",
68	},
69	{
70		.name = "DCDC3",
71	},
72	{
73		.name = "DCDC4",
74	},
75	{
76		.name = "LDO1",
77	},
78	{
79		.name = "LDO2",
80	},
81	{
82		.name = "LDO3",
83	},
84	{
85		.name = "LDO4",
86	},
87	{
88		.name = "LDO5",
89	},
90	{
91		.name = "LDO6",
92	},
93	{
94		.name = "LDO7",
95	},
96	{
97		.name = "LDO8",
98	},
99	{
100		.name = "LDO9",
101	},
102	{
103		.name = "LDO10",
104	},
105};
106
107struct tps65912_reg {
108	struct regulator_desc desc[TPS65912_NUM_REGULATOR];
109	struct tps65912 *mfd;
110	struct regulator_dev *rdev[TPS65912_NUM_REGULATOR];
111	struct tps_info *info[TPS65912_NUM_REGULATOR];
112	/* for read/write access */
113	struct mutex io_lock;
114	int mode;
115	int (*get_ctrl_reg)(int);
116	int dcdc_range[TPS65912_NUM_DCDC];
117	int pwm_mode_reg;
118	int eco_reg;
119};
120
121static const struct regulator_linear_range tps65912_ldo_ranges[] = {
122	REGULATOR_LINEAR_RANGE(800000, 0, 32, 25000),
123	REGULATOR_LINEAR_RANGE(1650000, 33, 60, 50000),
124	REGULATOR_LINEAR_RANGE(3100000, 61, 63, 100000),
125};
126
127static int tps65912_get_range(struct tps65912_reg *pmic, int id)
128{
129	struct tps65912 *mfd = pmic->mfd;
130	int range;
131
132	switch (id) {
133	case TPS65912_REG_DCDC1:
134		range = tps65912_reg_read(mfd, TPS65912_DCDC1_LIMIT);
135		break;
136	case TPS65912_REG_DCDC2:
137		range = tps65912_reg_read(mfd, TPS65912_DCDC2_LIMIT);
138		break;
139	case TPS65912_REG_DCDC3:
140		range = tps65912_reg_read(mfd, TPS65912_DCDC3_LIMIT);
141		break;
142	case TPS65912_REG_DCDC4:
143		range = tps65912_reg_read(mfd, TPS65912_DCDC4_LIMIT);
144		break;
145	default:
146		return 0;
147	}
148
149	if (range >= 0)
150		range = (range & DCDC_LIMIT_RANGE_MASK)
151			>> DCDC_LIMIT_RANGE_SHIFT;
152
153	pmic->dcdc_range[id] = range;
154	return range;
155}
156
157static unsigned long tps65912_vsel_to_uv_range0(u8 vsel)
158{
159	unsigned long uv;
160
161	uv = ((vsel * 12500) + 500000);
162	return uv;
163}
164
165static unsigned long tps65912_vsel_to_uv_range1(u8 vsel)
166{
167	unsigned long uv;
168
169	 uv = ((vsel * 12500) + 700000);
170	return uv;
171}
172
173static unsigned long tps65912_vsel_to_uv_range2(u8 vsel)
174{
175	unsigned long uv;
176
177	uv = ((vsel * 25000) + 500000);
178	return uv;
179}
180
181static unsigned long tps65912_vsel_to_uv_range3(u8 vsel)
182{
183	unsigned long uv;
184
185	if (vsel == 0x3f)
186		uv = 3800000;
187	else
188		uv = ((vsel * 50000) + 500000);
189
190	return uv;
191}
192
193static int tps65912_get_ctrl_register(int id)
194{
195	if (id >= TPS65912_REG_DCDC1 && id <= TPS65912_REG_LDO4)
196		return id * 3 + TPS65912_DCDC1_AVS;
197	else if (id >= TPS65912_REG_LDO5 && id <= TPS65912_REG_LDO10)
198		return id - TPS65912_REG_LDO5 + TPS65912_LDO5;
199	else
200		return -EINVAL;
201}
202
203static int tps65912_get_sel_register(struct tps65912_reg *pmic, int id)
204{
205	struct tps65912 *mfd = pmic->mfd;
206	int opvsel;
207	u8 reg = 0;
208
209	if (id >= TPS65912_REG_DCDC1 && id <= TPS65912_REG_LDO4) {
210		opvsel = tps65912_reg_read(mfd, id * 3 + TPS65912_DCDC1_OP);
211		if (opvsel & OP_SELREG_MASK)
212			reg = id * 3 + TPS65912_DCDC1_AVS;
213		else
214			reg = id * 3 + TPS65912_DCDC1_OP;
215	} else if (id >= TPS65912_REG_LDO5 && id <= TPS65912_REG_LDO10) {
216		reg = id - TPS65912_REG_LDO5 + TPS65912_LDO5;
217	} else {
218		return -EINVAL;
219	}
220
221	return reg;
222}
223
224static int tps65912_get_mode_regiters(struct tps65912_reg *pmic, int id)
225{
226	switch (id) {
227	case TPS65912_REG_DCDC1:
228		pmic->pwm_mode_reg = TPS65912_DCDC1_CTRL;
229		pmic->eco_reg = TPS65912_DCDC1_AVS;
230		break;
231	case TPS65912_REG_DCDC2:
232		pmic->pwm_mode_reg = TPS65912_DCDC2_CTRL;
233		pmic->eco_reg = TPS65912_DCDC2_AVS;
234		break;
235	case TPS65912_REG_DCDC3:
236		pmic->pwm_mode_reg = TPS65912_DCDC3_CTRL;
237		pmic->eco_reg = TPS65912_DCDC3_AVS;
238		break;
239	case TPS65912_REG_DCDC4:
240		pmic->pwm_mode_reg = TPS65912_DCDC4_CTRL;
241		pmic->eco_reg = TPS65912_DCDC4_AVS;
242		break;
243	default:
244		return -EINVAL;
245	}
246
247	return 0;
248}
249
250static int tps65912_reg_is_enabled(struct regulator_dev *dev)
251{
252	struct tps65912_reg *pmic = rdev_get_drvdata(dev);
253	struct tps65912 *mfd = pmic->mfd;
254	int reg, value, id = rdev_get_id(dev);
255
256	if (id < TPS65912_REG_DCDC1 || id > TPS65912_REG_LDO10)
257		return -EINVAL;
258
259	reg = pmic->get_ctrl_reg(id);
260	if (reg < 0)
261		return reg;
262
263	value = tps65912_reg_read(mfd, reg);
264	if (value < 0)
265		return value;
266
267	return value & TPS65912_REG_ENABLED;
268}
269
270static int tps65912_reg_enable(struct regulator_dev *dev)
271{
272	struct tps65912_reg *pmic = rdev_get_drvdata(dev);
273	struct tps65912 *mfd = pmic->mfd;
274	int id = rdev_get_id(dev);
275	int reg;
276
277	if (id < TPS65912_REG_DCDC1 || id > TPS65912_REG_LDO10)
278		return -EINVAL;
279
280	reg = pmic->get_ctrl_reg(id);
281	if (reg < 0)
282		return reg;
283
284	return tps65912_set_bits(mfd, reg, TPS65912_REG_ENABLED);
285}
286
287static int tps65912_reg_disable(struct regulator_dev *dev)
288{
289	struct tps65912_reg *pmic = rdev_get_drvdata(dev);
290	struct tps65912 *mfd = pmic->mfd;
291	int id = rdev_get_id(dev), reg;
292
293	reg = pmic->get_ctrl_reg(id);
294	if (reg < 0)
295		return reg;
296
297	return tps65912_clear_bits(mfd, reg, TPS65912_REG_ENABLED);
298}
299
300static int tps65912_set_mode(struct regulator_dev *dev, unsigned int mode)
301{
302	struct tps65912_reg *pmic = rdev_get_drvdata(dev);
303	struct tps65912 *mfd = pmic->mfd;
304	int pwm_mode, eco, id = rdev_get_id(dev);
305
306	tps65912_get_mode_regiters(pmic, id);
307
308	pwm_mode = tps65912_reg_read(mfd, pmic->pwm_mode_reg);
309	eco = tps65912_reg_read(mfd, pmic->eco_reg);
310
311	pwm_mode &= DCDCCTRL_DCDC_MODE_MASK;
312	eco &= DCDC_AVS_ECO_MASK;
313
314	switch (mode) {
315	case REGULATOR_MODE_FAST:
316		/* Verify if mode alredy set */
317		if (pwm_mode && !eco)
318			break;
319		tps65912_set_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
320		tps65912_clear_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
321		break;
322	case REGULATOR_MODE_NORMAL:
323	case REGULATOR_MODE_IDLE:
324		if (!pwm_mode && !eco)
325			break;
326		tps65912_clear_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
327		tps65912_clear_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
328		break;
329	case REGULATOR_MODE_STANDBY:
330		if (!pwm_mode && eco)
331			break;
332		tps65912_clear_bits(mfd, pmic->pwm_mode_reg, DCDCCTRL_DCDC_MODE_MASK);
333		tps65912_set_bits(mfd, pmic->eco_reg, DCDC_AVS_ECO_MASK);
334		break;
335	default:
336		return -EINVAL;
337	}
338
339	return 0;
340}
341
342static unsigned int tps65912_get_mode(struct regulator_dev *dev)
343{
344	struct tps65912_reg *pmic = rdev_get_drvdata(dev);
345	struct tps65912 *mfd = pmic->mfd;
346	int pwm_mode, eco, mode = 0, id = rdev_get_id(dev);
347
348	tps65912_get_mode_regiters(pmic, id);
349
350	pwm_mode = tps65912_reg_read(mfd, pmic->pwm_mode_reg);
351	eco = tps65912_reg_read(mfd, pmic->eco_reg);
352
353	pwm_mode &= DCDCCTRL_DCDC_MODE_MASK;
354	eco &= DCDC_AVS_ECO_MASK;
355
356	if (pwm_mode && !eco)
357		mode = REGULATOR_MODE_FAST;
358	else if (!pwm_mode && !eco)
359		mode = REGULATOR_MODE_NORMAL;
360	else if (!pwm_mode && eco)
361		mode = REGULATOR_MODE_STANDBY;
362
363	return mode;
364}
365
366static int tps65912_list_voltage(struct regulator_dev *dev, unsigned selector)
367{
368	struct tps65912_reg *pmic = rdev_get_drvdata(dev);
369	int range, voltage = 0, id = rdev_get_id(dev);
370
371	if (id > TPS65912_REG_DCDC4)
372		return -EINVAL;
373
374	range = pmic->dcdc_range[id];
375
376	switch (range) {
377	case 0:
378		/* 0.5 - 1.2875V in 12.5mV steps */
379		voltage = tps65912_vsel_to_uv_range0(selector);
380		break;
381	case 1:
382		/* 0.7 - 1.4875V in 12.5mV steps */
383		voltage = tps65912_vsel_to_uv_range1(selector);
384		break;
385	case 2:
386		/* 0.5 - 2.075V in 25mV steps */
387		voltage = tps65912_vsel_to_uv_range2(selector);
388		break;
389	case 3:
390		/* 0.5 - 3.8V in 50mV steps */
391		voltage = tps65912_vsel_to_uv_range3(selector);
392		break;
393	}
394	return voltage;
395}
396
397static int tps65912_get_voltage_sel(struct regulator_dev *dev)
398{
399	struct tps65912_reg *pmic = rdev_get_drvdata(dev);
400	struct tps65912 *mfd = pmic->mfd;
401	int id = rdev_get_id(dev);
402	int reg, vsel;
403
404	reg = tps65912_get_sel_register(pmic, id);
405	if (reg < 0)
406		return reg;
407
408	vsel = tps65912_reg_read(mfd, reg);
409	vsel &= 0x3F;
410
411	return vsel;
412}
413
414static int tps65912_set_voltage_sel(struct regulator_dev *dev,
415					 unsigned selector)
416{
417	struct tps65912_reg *pmic = rdev_get_drvdata(dev);
418	struct tps65912 *mfd = pmic->mfd;
419	int id = rdev_get_id(dev);
420	int value;
421	u8 reg;
422
423	reg = tps65912_get_sel_register(pmic, id);
424	value = tps65912_reg_read(mfd, reg);
425	value &= 0xC0;
426	return tps65912_reg_write(mfd, reg, selector | value);
427}
428
429/* Operations permitted on DCDCx */
430static struct regulator_ops tps65912_ops_dcdc = {
431	.is_enabled = tps65912_reg_is_enabled,
432	.enable = tps65912_reg_enable,
433	.disable = tps65912_reg_disable,
434	.set_mode = tps65912_set_mode,
435	.get_mode = tps65912_get_mode,
436	.get_voltage_sel = tps65912_get_voltage_sel,
437	.set_voltage_sel = tps65912_set_voltage_sel,
438	.list_voltage = tps65912_list_voltage,
439};
440
441/* Operations permitted on LDOx */
442static struct regulator_ops tps65912_ops_ldo = {
443	.is_enabled = tps65912_reg_is_enabled,
444	.enable = tps65912_reg_enable,
445	.disable = tps65912_reg_disable,
446	.get_voltage_sel = tps65912_get_voltage_sel,
447	.set_voltage_sel = tps65912_set_voltage_sel,
448	.list_voltage = regulator_list_voltage_linear_range,
449	.map_voltage = regulator_map_voltage_linear_range,
450};
451
452static int tps65912_probe(struct platform_device *pdev)
453{
454	struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
455	struct regulator_config config = { };
456	struct tps_info *info;
457	struct regulator_init_data *reg_data;
458	struct regulator_dev *rdev;
459	struct tps65912_reg *pmic;
460	struct tps65912_board *pmic_plat_data;
461	int i;
462
463	pmic_plat_data = dev_get_platdata(tps65912->dev);
464	if (!pmic_plat_data)
465		return -EINVAL;
466
467	reg_data = pmic_plat_data->tps65912_pmic_init_data;
468
469	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
470	if (!pmic)
471		return -ENOMEM;
472
473	mutex_init(&pmic->io_lock);
474	pmic->mfd = tps65912;
475	platform_set_drvdata(pdev, pmic);
476
477	pmic->get_ctrl_reg = &tps65912_get_ctrl_register;
478	info = tps65912_regs;
479
480	for (i = 0; i < TPS65912_NUM_REGULATOR; i++, info++, reg_data++) {
481		int range = 0;
482		/* Register the regulators */
483		pmic->info[i] = info;
484
485		pmic->desc[i].name = info->name;
486		pmic->desc[i].id = i;
487		pmic->desc[i].n_voltages = 64;
488		if (i > TPS65912_REG_DCDC4) {
489			pmic->desc[i].ops = &tps65912_ops_ldo;
490			pmic->desc[i].linear_ranges = tps65912_ldo_ranges;
491			pmic->desc[i].n_linear_ranges =
492					ARRAY_SIZE(tps65912_ldo_ranges);
493		} else {
494			pmic->desc[i].ops = &tps65912_ops_dcdc;
495		}
496		pmic->desc[i].type = REGULATOR_VOLTAGE;
497		pmic->desc[i].owner = THIS_MODULE;
498		range = tps65912_get_range(pmic, i);
499
500		config.dev = tps65912->dev;
501		config.init_data = reg_data;
502		config.driver_data = pmic;
503
504		rdev = devm_regulator_register(&pdev->dev, &pmic->desc[i],
505					       &config);
506		if (IS_ERR(rdev)) {
507			dev_err(tps65912->dev,
508				"failed to register %s regulator\n",
509				pdev->name);
510			return PTR_ERR(rdev);
511		}
512
513		/* Save regulator for cleanup */
514		pmic->rdev[i] = rdev;
515	}
516	return 0;
517}
518
519static struct platform_driver tps65912_driver = {
520	.driver = {
521		.name = "tps65912-pmic",
522	},
523	.probe = tps65912_probe,
524};
525
526static int __init tps65912_init(void)
527{
528	return platform_driver_register(&tps65912_driver);
529}
530subsys_initcall(tps65912_init);
531
532static void __exit tps65912_cleanup(void)
533{
534	platform_driver_unregister(&tps65912_driver);
535}
536module_exit(tps65912_cleanup);
537
538MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
539MODULE_DESCRIPTION("TPS65912 voltage regulator driver");
540MODULE_LICENSE("GPL v2");
541MODULE_ALIAS("platform:tps65912-pmic");
542