1/*
2* da9052-regulator.c: Regulator driver for DA9052
3*
4* Copyright(c) 2011 Dialog Semiconductor Ltd.
5*
6* Author: David Dajun Chen <dchen@diasemi.com>
7*
8* This program is free software; you can redistribute it and/or modify
9* it under the terms of the GNU General Public License as published by
10* the Free Software Foundation; either version 2 of the License, or
11* (at your option) any later version.
12*
13*/
14
15#include <linux/module.h>
16#include <linux/moduleparam.h>
17#include <linux/init.h>
18#include <linux/err.h>
19#include <linux/platform_device.h>
20#include <linux/regulator/driver.h>
21#include <linux/regulator/machine.h>
22#ifdef CONFIG_OF
23#include <linux/of.h>
24#include <linux/regulator/of_regulator.h>
25#endif
26
27#include <linux/mfd/da9052/da9052.h>
28#include <linux/mfd/da9052/reg.h>
29#include <linux/mfd/da9052/pdata.h>
30
31/* Buck step size */
32#define DA9052_BUCK_PERI_3uV_STEP		100000
33#define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV	24
34#define DA9052_CONST_3uV			3000000
35
36#define DA9052_MIN_UA		0
37#define DA9052_MAX_UA		3
38#define DA9052_CURRENT_RANGE	4
39
40/* Bit masks */
41#define DA9052_BUCK_ILIM_MASK_EVEN	0x0c
42#define DA9052_BUCK_ILIM_MASK_ODD	0xc0
43
44/* DA9052 REGULATOR IDs */
45#define DA9052_ID_BUCK1		0
46#define DA9052_ID_BUCK2		1
47#define DA9052_ID_BUCK3		2
48#define DA9052_ID_BUCK4		3
49#define DA9052_ID_LDO1		4
50#define DA9052_ID_LDO2		5
51#define DA9052_ID_LDO3		6
52#define DA9052_ID_LDO4		7
53#define DA9052_ID_LDO5		8
54#define DA9052_ID_LDO6		9
55#define DA9052_ID_LDO7		10
56#define DA9052_ID_LDO8		11
57#define DA9052_ID_LDO9		12
58#define DA9052_ID_LDO10		13
59
60static const u32 da9052_current_limits[3][4] = {
61	{700000, 800000, 1000000, 1200000},	/* DA9052-BC BUCKs */
62	{1600000, 2000000, 2400000, 3000000},	/* DA9053-AA/Bx BUCK-CORE */
63	{800000, 1000000, 1200000, 1500000},	/* DA9053-AA/Bx BUCK-PRO,
64						 * BUCK-MEM and BUCK-PERI
65						*/
66};
67
68struct da9052_regulator_info {
69	struct regulator_desc reg_desc;
70	int step_uV;
71	int min_uV;
72	int max_uV;
73	unsigned char activate_bit;
74};
75
76struct da9052_regulator {
77	struct da9052 *da9052;
78	struct da9052_regulator_info *info;
79	struct regulator_dev *rdev;
80};
81
82static int verify_range(struct da9052_regulator_info *info,
83			 int min_uV, int max_uV)
84{
85	if (min_uV > info->max_uV || max_uV < info->min_uV)
86		return -EINVAL;
87
88	return 0;
89}
90
91static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
92{
93	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
94	int offset = rdev_get_id(rdev);
95	int ret, row = 2;
96
97	ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
98	if (ret < 0)
99		return ret;
100
101	/* Determine the even or odd position of the buck current limit
102	 * register field
103	*/
104	if (offset % 2 == 0)
105		ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
106	else
107		ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
108
109	/* Select the appropriate current limit range */
110	if (regulator->da9052->chip_id == DA9052)
111		row = 0;
112	else if (offset == 0)
113		row = 1;
114
115	return da9052_current_limits[row][ret];
116}
117
118static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
119					  int max_uA)
120{
121	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
122	int offset = rdev_get_id(rdev);
123	int reg_val = 0;
124	int i, row = 2;
125
126	/* Select the appropriate current limit range */
127	if (regulator->da9052->chip_id == DA9052)
128		row = 0;
129	else if (offset == 0)
130		row = 1;
131
132	for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
133		if ((min_uA <= da9052_current_limits[row][i]) &&
134		    (da9052_current_limits[row][i] <= max_uA)) {
135			reg_val = i;
136			break;
137		}
138	}
139
140	if (i < 0)
141		return -EINVAL;
142
143	/* Determine the even or odd position of the buck current limit
144	 * register field
145	*/
146	if (offset % 2 == 0)
147		return da9052_reg_update(regulator->da9052,
148					 DA9052_BUCKA_REG + offset/2,
149					 DA9052_BUCK_ILIM_MASK_EVEN,
150					 reg_val << 2);
151	else
152		return da9052_reg_update(regulator->da9052,
153					 DA9052_BUCKA_REG + offset/2,
154					 DA9052_BUCK_ILIM_MASK_ODD,
155					 reg_val << 6);
156}
157
158static int da9052_list_voltage(struct regulator_dev *rdev,
159				unsigned int selector)
160{
161	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
162	struct da9052_regulator_info *info = regulator->info;
163	int id = rdev_get_id(rdev);
164	int volt_uV;
165
166	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
167		&& (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
168		volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
169			  + info->min_uV);
170		volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
171				    * (DA9052_BUCK_PERI_3uV_STEP);
172	} else {
173		volt_uV = (selector * info->step_uV) + info->min_uV;
174	}
175
176	if (volt_uV > info->max_uV)
177		return -EINVAL;
178
179	return volt_uV;
180}
181
182static int da9052_map_voltage(struct regulator_dev *rdev,
183			      int min_uV, int max_uV)
184{
185	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
186	struct da9052_regulator_info *info = regulator->info;
187	int id = rdev_get_id(rdev);
188	int ret, sel;
189
190	ret = verify_range(info, min_uV, max_uV);
191	if (ret < 0)
192		return ret;
193
194	if (min_uV < info->min_uV)
195		min_uV = info->min_uV;
196
197	if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
198		&& (min_uV >= DA9052_CONST_3uV)) {
199			sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
200			      DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
201					   DA9052_BUCK_PERI_3uV_STEP);
202	} else {
203		sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
204	}
205
206	ret = da9052_list_voltage(rdev, sel);
207	if (ret < 0)
208		return ret;
209
210	return sel;
211}
212
213static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
214					    unsigned int selector)
215{
216	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
217	struct da9052_regulator_info *info = regulator->info;
218	int id = rdev_get_id(rdev);
219	int ret;
220
221	ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
222				rdev->desc->vsel_mask, selector);
223	if (ret < 0)
224		return ret;
225
226	/* Some LDOs and DCDCs are DVC controlled which requires enabling of
227	 * the activate bit to implment the changes on the output.
228	 */
229	switch (id) {
230	case DA9052_ID_BUCK1:
231	case DA9052_ID_BUCK2:
232	case DA9052_ID_BUCK3:
233	case DA9052_ID_LDO2:
234	case DA9052_ID_LDO3:
235		ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
236					info->activate_bit, info->activate_bit);
237		break;
238	}
239
240	return ret;
241}
242
243static int da9052_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
244						 unsigned int old_sel,
245						 unsigned int new_sel)
246{
247	struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
248	struct da9052_regulator_info *info = regulator->info;
249	int id = rdev_get_id(rdev);
250	int ret = 0;
251
252	/* The DVC controlled LDOs and DCDCs ramp with 6.25mV/��s after enabling
253	 * the activate bit.
254	 */
255	switch (id) {
256	case DA9052_ID_BUCK1:
257	case DA9052_ID_BUCK2:
258	case DA9052_ID_BUCK3:
259	case DA9052_ID_LDO2:
260	case DA9052_ID_LDO3:
261		ret = (new_sel - old_sel) * info->step_uV / 6250;
262		break;
263	}
264
265	return ret;
266}
267
268static struct regulator_ops da9052_dcdc_ops = {
269	.get_current_limit = da9052_dcdc_get_current_limit,
270	.set_current_limit = da9052_dcdc_set_current_limit,
271
272	.list_voltage = da9052_list_voltage,
273	.map_voltage = da9052_map_voltage,
274	.get_voltage_sel = regulator_get_voltage_sel_regmap,
275	.set_voltage_sel = da9052_regulator_set_voltage_sel,
276	.set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
277	.is_enabled = regulator_is_enabled_regmap,
278	.enable = regulator_enable_regmap,
279	.disable = regulator_disable_regmap,
280};
281
282static struct regulator_ops da9052_ldo_ops = {
283	.list_voltage = da9052_list_voltage,
284	.map_voltage = da9052_map_voltage,
285	.get_voltage_sel = regulator_get_voltage_sel_regmap,
286	.set_voltage_sel = da9052_regulator_set_voltage_sel,
287	.set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
288	.is_enabled = regulator_is_enabled_regmap,
289	.enable = regulator_enable_regmap,
290	.disable = regulator_disable_regmap,
291};
292
293#define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
294{\
295	.reg_desc = {\
296		.name = #_id,\
297		.ops = &da9052_ldo_ops,\
298		.type = REGULATOR_VOLTAGE,\
299		.id = DA9052_ID_##_id,\
300		.n_voltages = (max - min) / step + 1, \
301		.owner = THIS_MODULE,\
302		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
303		.vsel_mask = (1 << (sbits)) - 1,\
304		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
305		.enable_mask = 1 << (ebits),\
306	},\
307	.min_uV = (min) * 1000,\
308	.max_uV = (max) * 1000,\
309	.step_uV = (step) * 1000,\
310	.activate_bit = (abits),\
311}
312
313#define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
314{\
315	.reg_desc = {\
316		.name = #_id,\
317		.ops = &da9052_dcdc_ops,\
318		.type = REGULATOR_VOLTAGE,\
319		.id = DA9052_ID_##_id,\
320		.n_voltages = (max - min) / step + 1, \
321		.owner = THIS_MODULE,\
322		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
323		.vsel_mask = (1 << (sbits)) - 1,\
324		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
325		.enable_mask = 1 << (ebits),\
326	},\
327	.min_uV = (min) * 1000,\
328	.max_uV = (max) * 1000,\
329	.step_uV = (step) * 1000,\
330	.activate_bit = (abits),\
331}
332
333static struct da9052_regulator_info da9052_regulator_info[] = {
334	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
335	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
336	DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
337	DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
338	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
339	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
340	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
341	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
342	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
343	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
344	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
345	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
346	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
347	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
348};
349
350static struct da9052_regulator_info da9053_regulator_info[] = {
351	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
352	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
353	DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
354	DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0),
355	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
356	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
357	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
358	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
359	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
360	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
361	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
362	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
363	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
364	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
365};
366
367static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
368								 int id)
369{
370	struct da9052_regulator_info *info;
371	int i;
372
373	switch (chip_id) {
374	case DA9052:
375		for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
376			info = &da9052_regulator_info[i];
377			if (info->reg_desc.id == id)
378				return info;
379		}
380		break;
381	case DA9053_AA:
382	case DA9053_BA:
383	case DA9053_BB:
384	case DA9053_BC:
385		for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
386			info = &da9053_regulator_info[i];
387			if (info->reg_desc.id == id)
388				return info;
389		}
390		break;
391	}
392
393	return NULL;
394}
395
396static int da9052_regulator_probe(struct platform_device *pdev)
397{
398	const struct mfd_cell *cell = mfd_get_cell(pdev);
399	struct regulator_config config = { };
400	struct da9052_regulator *regulator;
401	struct da9052 *da9052;
402	struct da9052_pdata *pdata;
403
404	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
405				 GFP_KERNEL);
406	if (!regulator)
407		return -ENOMEM;
408
409	da9052 = dev_get_drvdata(pdev->dev.parent);
410	pdata = dev_get_platdata(da9052->dev);
411	regulator->da9052 = da9052;
412
413	regulator->info = find_regulator_info(regulator->da9052->chip_id,
414					      cell->id);
415	if (regulator->info == NULL) {
416		dev_err(&pdev->dev, "invalid regulator ID specified\n");
417		return -EINVAL;
418	}
419
420	config.dev = &pdev->dev;
421	config.driver_data = regulator;
422	config.regmap = da9052->regmap;
423	if (pdata && pdata->regulators) {
424		config.init_data = pdata->regulators[cell->id];
425	} else {
426#ifdef CONFIG_OF
427		struct device_node *nproot = da9052->dev->of_node;
428		struct device_node *np;
429
430		if (!nproot)
431			return -ENODEV;
432
433		nproot = of_get_child_by_name(nproot, "regulators");
434		if (!nproot)
435			return -ENODEV;
436
437		for_each_child_of_node(nproot, np) {
438			if (!of_node_cmp(np->name,
439					 regulator->info->reg_desc.name)) {
440				config.init_data = of_get_regulator_init_data(
441					&pdev->dev, np,
442					&regulator->info->reg_desc);
443				config.of_node = np;
444				break;
445			}
446		}
447		of_node_put(nproot);
448#endif
449	}
450
451	regulator->rdev = devm_regulator_register(&pdev->dev,
452						  &regulator->info->reg_desc,
453						  &config);
454	if (IS_ERR(regulator->rdev)) {
455		dev_err(&pdev->dev, "failed to register regulator %s\n",
456			regulator->info->reg_desc.name);
457		return PTR_ERR(regulator->rdev);
458	}
459
460	platform_set_drvdata(pdev, regulator);
461
462	return 0;
463}
464
465static struct platform_driver da9052_regulator_driver = {
466	.probe = da9052_regulator_probe,
467	.driver = {
468		.name = "da9052-regulator",
469	},
470};
471
472static int __init da9052_regulator_init(void)
473{
474	return platform_driver_register(&da9052_regulator_driver);
475}
476subsys_initcall(da9052_regulator_init);
477
478static void __exit da9052_regulator_exit(void)
479{
480	platform_driver_unregister(&da9052_regulator_driver);
481}
482module_exit(da9052_regulator_exit);
483
484MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
485MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
486MODULE_LICENSE("GPL");
487MODULE_ALIAS("platform:da9052-regulator");
488