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	if (min_uA > da9052_current_limits[row][DA9052_MAX_UA] ||
133	    max_uA < da9052_current_limits[row][DA9052_MIN_UA])
134		return -EINVAL;
135
136	for (i = 0; i < DA9052_CURRENT_RANGE; i++) {
137		if (min_uA <= da9052_current_limits[row][i]) {
138			reg_val = i;
139			break;
140		}
141	}
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 struct regulator_ops da9052_dcdc_ops = {
244	.get_current_limit = da9052_dcdc_get_current_limit,
245	.set_current_limit = da9052_dcdc_set_current_limit,
246
247	.list_voltage = da9052_list_voltage,
248	.map_voltage = da9052_map_voltage,
249	.get_voltage_sel = regulator_get_voltage_sel_regmap,
250	.set_voltage_sel = da9052_regulator_set_voltage_sel,
251	.is_enabled = regulator_is_enabled_regmap,
252	.enable = regulator_enable_regmap,
253	.disable = regulator_disable_regmap,
254};
255
256static struct regulator_ops da9052_ldo_ops = {
257	.list_voltage = da9052_list_voltage,
258	.map_voltage = da9052_map_voltage,
259	.get_voltage_sel = regulator_get_voltage_sel_regmap,
260	.set_voltage_sel = da9052_regulator_set_voltage_sel,
261	.is_enabled = regulator_is_enabled_regmap,
262	.enable = regulator_enable_regmap,
263	.disable = regulator_disable_regmap,
264};
265
266#define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
267{\
268	.reg_desc = {\
269		.name = #_id,\
270		.ops = &da9052_ldo_ops,\
271		.type = REGULATOR_VOLTAGE,\
272		.id = DA9052_ID_##_id,\
273		.n_voltages = (max - min) / step + 1, \
274		.owner = THIS_MODULE,\
275		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
276		.vsel_mask = (1 << (sbits)) - 1,\
277		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
278		.enable_mask = 1 << (ebits),\
279	},\
280	.min_uV = (min) * 1000,\
281	.max_uV = (max) * 1000,\
282	.step_uV = (step) * 1000,\
283	.activate_bit = (abits),\
284}
285
286#define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
287{\
288	.reg_desc = {\
289		.name = #_id,\
290		.ops = &da9052_dcdc_ops,\
291		.type = REGULATOR_VOLTAGE,\
292		.id = DA9052_ID_##_id,\
293		.n_voltages = (max - min) / step + 1, \
294		.owner = THIS_MODULE,\
295		.vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
296		.vsel_mask = (1 << (sbits)) - 1,\
297		.enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
298		.enable_mask = 1 << (ebits),\
299	},\
300	.min_uV = (min) * 1000,\
301	.max_uV = (max) * 1000,\
302	.step_uV = (step) * 1000,\
303	.activate_bit = (abits),\
304}
305
306static struct da9052_regulator_info da9052_regulator_info[] = {
307	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
308	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
309	DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
310	DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
311	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
312	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
313	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
314	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
315	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
316	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
317	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
318	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
319	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
320	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
321};
322
323static struct da9052_regulator_info da9053_regulator_info[] = {
324	DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
325	DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
326	DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
327	DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0),
328	DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
329	DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
330	DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
331	DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
332	DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
333	DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
334	DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
335	DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
336	DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
337	DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
338};
339
340static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
341								 int id)
342{
343	struct da9052_regulator_info *info;
344	int i;
345
346	switch (chip_id) {
347	case DA9052:
348		for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
349			info = &da9052_regulator_info[i];
350			if (info->reg_desc.id == id)
351				return info;
352		}
353		break;
354	case DA9053_AA:
355	case DA9053_BA:
356	case DA9053_BB:
357		for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
358			info = &da9053_regulator_info[i];
359			if (info->reg_desc.id == id)
360				return info;
361		}
362		break;
363	}
364
365	return NULL;
366}
367
368static int __devinit da9052_regulator_probe(struct platform_device *pdev)
369{
370	struct regulator_config config = { };
371	struct da9052_regulator *regulator;
372	struct da9052 *da9052;
373	struct da9052_pdata *pdata;
374
375	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
376				 GFP_KERNEL);
377	if (!regulator)
378		return -ENOMEM;
379
380	da9052 = dev_get_drvdata(pdev->dev.parent);
381	pdata = da9052->dev->platform_data;
382	regulator->da9052 = da9052;
383
384	regulator->info = find_regulator_info(regulator->da9052->chip_id,
385					      pdev->id);
386	if (regulator->info == NULL) {
387		dev_err(&pdev->dev, "invalid regulator ID specified\n");
388		return -EINVAL;
389	}
390
391	config.dev = &pdev->dev;
392	config.driver_data = regulator;
393	config.regmap = da9052->regmap;
394	if (pdata && pdata->regulators) {
395		config.init_data = pdata->regulators[pdev->id];
396	} else {
397#ifdef CONFIG_OF
398		struct device_node *nproot = da9052->dev->of_node;
399		struct device_node *np;
400
401		if (!nproot)
402			return -ENODEV;
403
404		nproot = of_find_node_by_name(nproot, "regulators");
405		if (!nproot)
406			return -ENODEV;
407
408		for (np = of_get_next_child(nproot, NULL); np;
409		     np = of_get_next_child(nproot, np)) {
410			if (!of_node_cmp(np->name,
411					 regulator->info->reg_desc.name)) {
412				config.init_data = of_get_regulator_init_data(
413					&pdev->dev, np);
414				break;
415			}
416		}
417#endif
418	}
419
420	regulator->rdev = regulator_register(&regulator->info->reg_desc,
421					     &config);
422	if (IS_ERR(regulator->rdev)) {
423		dev_err(&pdev->dev, "failed to register regulator %s\n",
424			regulator->info->reg_desc.name);
425		return PTR_ERR(regulator->rdev);
426	}
427
428	platform_set_drvdata(pdev, regulator);
429
430	return 0;
431}
432
433static int __devexit da9052_regulator_remove(struct platform_device *pdev)
434{
435	struct da9052_regulator *regulator = platform_get_drvdata(pdev);
436
437	regulator_unregister(regulator->rdev);
438	return 0;
439}
440
441static struct platform_driver da9052_regulator_driver = {
442	.probe = da9052_regulator_probe,
443	.remove = __devexit_p(da9052_regulator_remove),
444	.driver = {
445		.name = "da9052-regulator",
446		.owner = THIS_MODULE,
447	},
448};
449
450static int __init da9052_regulator_init(void)
451{
452	return platform_driver_register(&da9052_regulator_driver);
453}
454subsys_initcall(da9052_regulator_init);
455
456static void __exit da9052_regulator_exit(void)
457{
458	platform_driver_unregister(&da9052_regulator_driver);
459}
460module_exit(da9052_regulator_exit);
461
462MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
463MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
464MODULE_LICENSE("GPL");
465MODULE_ALIAS("platform:da9052-regulator");