1 /*
2  * Regulator Driver for Freescale MC13892 PMIC
3  *
4  * Copyright 2010 Yong Shen <yong.shen@linaro.org>
5  *
6  * Based on draft driver from Arnaud Patard <arnaud.patard@rtp-net.org>
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 version 2 as
10  * published by the Free Software Foundation.
11  */
12 
13 #include <linux/mfd/mc13892.h>
14 #include <linux/regulator/machine.h>
15 #include <linux/regulator/driver.h>
16 #include <linux/platform_device.h>
17 #include <linux/kernel.h>
18 #include <linux/slab.h>
19 #include <linux/init.h>
20 #include <linux/err.h>
21 #include <linux/module.h>
22 #include "mc13xxx.h"
23 
24 #define MC13892_REVISION			7
25 
26 #define MC13892_POWERCTL0			13
27 #define MC13892_POWERCTL0_USEROFFSPI		3
28 #define MC13892_POWERCTL0_VCOINCELLVSEL		20
29 #define MC13892_POWERCTL0_VCOINCELLVSEL_M	(7<<20)
30 #define MC13892_POWERCTL0_VCOINCELLEN		(1<<23)
31 
32 #define MC13892_SWITCHERS0_SWxHI		(1<<23)
33 
34 #define MC13892_SWITCHERS0			24
35 #define MC13892_SWITCHERS0_SW1VSEL		0
36 #define MC13892_SWITCHERS0_SW1VSEL_M		(0x1f<<0)
37 #define MC13892_SWITCHERS0_SW1HI		(1<<23)
38 #define MC13892_SWITCHERS0_SW1EN		0
39 
40 #define MC13892_SWITCHERS1			25
41 #define MC13892_SWITCHERS1_SW2VSEL		0
42 #define MC13892_SWITCHERS1_SW2VSEL_M		(0x1f<<0)
43 #define MC13892_SWITCHERS1_SW2HI		(1<<23)
44 #define MC13892_SWITCHERS1_SW2EN		0
45 
46 #define MC13892_SWITCHERS2			26
47 #define MC13892_SWITCHERS2_SW3VSEL		0
48 #define MC13892_SWITCHERS2_SW3VSEL_M		(0x1f<<0)
49 #define MC13892_SWITCHERS2_SW3HI		(1<<23)
50 #define MC13892_SWITCHERS2_SW3EN		0
51 
52 #define MC13892_SWITCHERS3			27
53 #define MC13892_SWITCHERS3_SW4VSEL		0
54 #define MC13892_SWITCHERS3_SW4VSEL_M		(0x1f<<0)
55 #define MC13892_SWITCHERS3_SW4HI		(1<<23)
56 #define MC13892_SWITCHERS3_SW4EN		0
57 
58 #define MC13892_SWITCHERS4			28
59 #define MC13892_SWITCHERS4_SW1MODE		0
60 #define MC13892_SWITCHERS4_SW1MODE_AUTO		(8<<0)
61 #define MC13892_SWITCHERS4_SW1MODE_M		(0xf<<0)
62 #define MC13892_SWITCHERS4_SW2MODE		10
63 #define MC13892_SWITCHERS4_SW2MODE_AUTO		(8<<10)
64 #define MC13892_SWITCHERS4_SW2MODE_M		(0xf<<10)
65 
66 #define MC13892_SWITCHERS5			29
67 #define MC13892_SWITCHERS5_SW3MODE		0
68 #define MC13892_SWITCHERS5_SW3MODE_AUTO		(8<<0)
69 #define MC13892_SWITCHERS5_SW3MODE_M		(0xf<<0)
70 #define MC13892_SWITCHERS5_SW4MODE		8
71 #define MC13892_SWITCHERS5_SW4MODE_AUTO		(8<<8)
72 #define MC13892_SWITCHERS5_SW4MODE_M		(0xf<<8)
73 #define MC13892_SWITCHERS5_SWBSTEN		(1<<20)
74 
75 #define MC13892_REGULATORSETTING0		30
76 #define MC13892_REGULATORSETTING0_VGEN1VSEL	0
77 #define MC13892_REGULATORSETTING0_VDIGVSEL	4
78 #define MC13892_REGULATORSETTING0_VGEN2VSEL	6
79 #define MC13892_REGULATORSETTING0_VPLLVSEL	9
80 #define MC13892_REGULATORSETTING0_VUSB2VSEL	11
81 #define MC13892_REGULATORSETTING0_VGEN3VSEL	14
82 #define MC13892_REGULATORSETTING0_VCAMVSEL	16
83 
84 #define MC13892_REGULATORSETTING0_VGEN1VSEL_M	(3<<0)
85 #define MC13892_REGULATORSETTING0_VDIGVSEL_M	(3<<4)
86 #define MC13892_REGULATORSETTING0_VGEN2VSEL_M	(7<<6)
87 #define MC13892_REGULATORSETTING0_VPLLVSEL_M	(3<<9)
88 #define MC13892_REGULATORSETTING0_VUSB2VSEL_M	(3<<11)
89 #define MC13892_REGULATORSETTING0_VGEN3VSEL_M	(1<<14)
90 #define MC13892_REGULATORSETTING0_VCAMVSEL_M	(3<<16)
91 
92 #define MC13892_REGULATORSETTING1		31
93 #define MC13892_REGULATORSETTING1_VVIDEOVSEL	2
94 #define MC13892_REGULATORSETTING1_VAUDIOVSEL	4
95 #define MC13892_REGULATORSETTING1_VSDVSEL	6
96 
97 #define MC13892_REGULATORSETTING1_VVIDEOVSEL_M	(3<<2)
98 #define MC13892_REGULATORSETTING1_VAUDIOVSEL_M	(3<<4)
99 #define MC13892_REGULATORSETTING1_VSDVSEL_M	(7<<6)
100 
101 #define MC13892_REGULATORMODE0			32
102 #define MC13892_REGULATORMODE0_VGEN1EN		(1<<0)
103 #define MC13892_REGULATORMODE0_VGEN1STDBY	(1<<1)
104 #define MC13892_REGULATORMODE0_VGEN1MODE	(1<<2)
105 #define MC13892_REGULATORMODE0_VIOHIEN		(1<<3)
106 #define MC13892_REGULATORMODE0_VIOHISTDBY	(1<<4)
107 #define MC13892_REGULATORMODE0_VIOHIMODE	(1<<5)
108 #define MC13892_REGULATORMODE0_VDIGEN		(1<<9)
109 #define MC13892_REGULATORMODE0_VDIGSTDBY	(1<<10)
110 #define MC13892_REGULATORMODE0_VDIGMODE		(1<<11)
111 #define MC13892_REGULATORMODE0_VGEN2EN		(1<<12)
112 #define MC13892_REGULATORMODE0_VGEN2STDBY	(1<<13)
113 #define MC13892_REGULATORMODE0_VGEN2MODE	(1<<14)
114 #define MC13892_REGULATORMODE0_VPLLEN		(1<<15)
115 #define MC13892_REGULATORMODE0_VPLLSTDBY	(1<<16)
116 #define MC13892_REGULATORMODE0_VPLLMODE		(1<<17)
117 #define MC13892_REGULATORMODE0_VUSB2EN		(1<<18)
118 #define MC13892_REGULATORMODE0_VUSB2STDBY	(1<<19)
119 #define MC13892_REGULATORMODE0_VUSB2MODE	(1<<20)
120 
121 #define MC13892_REGULATORMODE1			33
122 #define MC13892_REGULATORMODE1_VGEN3EN		(1<<0)
123 #define MC13892_REGULATORMODE1_VGEN3STDBY	(1<<1)
124 #define MC13892_REGULATORMODE1_VGEN3MODE	(1<<2)
125 #define MC13892_REGULATORMODE1_VCAMEN		(1<<6)
126 #define MC13892_REGULATORMODE1_VCAMSTDBY	(1<<7)
127 #define MC13892_REGULATORMODE1_VCAMMODE		(1<<8)
128 #define MC13892_REGULATORMODE1_VCAMCONFIGEN	(1<<9)
129 #define MC13892_REGULATORMODE1_VVIDEOEN		(1<<12)
130 #define MC13892_REGULATORMODE1_VVIDEOSTDBY	(1<<13)
131 #define MC13892_REGULATORMODE1_VVIDEOMODE	(1<<14)
132 #define MC13892_REGULATORMODE1_VAUDIOEN		(1<<15)
133 #define MC13892_REGULATORMODE1_VAUDIOSTDBY	(1<<16)
134 #define MC13892_REGULATORMODE1_VAUDIOMODE	(1<<17)
135 #define MC13892_REGULATORMODE1_VSDEN		(1<<18)
136 #define MC13892_REGULATORMODE1_VSDSTDBY		(1<<19)
137 #define MC13892_REGULATORMODE1_VSDMODE		(1<<20)
138 
139 #define MC13892_POWERMISC			34
140 #define MC13892_POWERMISC_GPO1EN		(1<<6)
141 #define MC13892_POWERMISC_GPO2EN		(1<<8)
142 #define MC13892_POWERMISC_GPO3EN		(1<<10)
143 #define MC13892_POWERMISC_GPO4EN		(1<<12)
144 #define MC13892_POWERMISC_PWGT1SPIEN		(1<<15)
145 #define MC13892_POWERMISC_PWGT2SPIEN		(1<<16)
146 #define MC13892_POWERMISC_GPO4ADINEN		(1<<21)
147 
148 #define MC13892_POWERMISC_PWGTSPI_M		(3 << 15)
149 
150 #define MC13892_USB1				50
151 #define MC13892_USB1_VUSBEN			(1<<3)
152 
153 static const unsigned int mc13892_vcoincell[] = {
154 	2500000, 2700000, 2800000, 2900000, 3000000, 3100000,
155 	3200000, 3300000,
156 };
157 
158 static const unsigned int mc13892_sw1[] = {
159 	600000,   625000,  650000,  675000,  700000,  725000,
160 	750000,   775000,  800000,  825000,  850000,  875000,
161 	900000,   925000,  950000,  975000, 1000000, 1025000,
162 	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
163 	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
164 	1350000, 1375000
165 };
166 
167 /*
168  * Note: this table is used to derive SWxVSEL by index into
169  * the array. Offset the values by the index of 1100000uV
170  * to get the actual register value for that voltage selector
171  * if the HI bit is to be set as well.
172  */
173 #define MC13892_SWxHI_SEL_OFFSET		20
174 
175 static const unsigned int mc13892_sw[] = {
176 	600000,   625000,  650000,  675000,  700000,  725000,
177 	750000,   775000,  800000,  825000,  850000,  875000,
178 	900000,   925000,  950000,  975000, 1000000, 1025000,
179 	1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
180 	1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
181 	1350000, 1375000, 1400000, 1425000, 1450000, 1475000,
182 	1500000, 1525000, 1550000, 1575000, 1600000, 1625000,
183 	1650000, 1675000, 1700000, 1725000, 1750000, 1775000,
184 	1800000, 1825000, 1850000, 1875000
185 };
186 
187 static const unsigned int mc13892_swbst[] = {
188 	5000000,
189 };
190 
191 static const unsigned int mc13892_viohi[] = {
192 	2775000,
193 };
194 
195 static const unsigned int mc13892_vpll[] = {
196 	1050000, 1250000, 1650000, 1800000,
197 };
198 
199 static const unsigned int mc13892_vdig[] = {
200 	1050000, 1250000, 1650000, 1800000,
201 };
202 
203 static const unsigned int mc13892_vsd[] = {
204 	1800000, 2000000, 2600000, 2700000,
205 	2800000, 2900000, 3000000, 3150000,
206 };
207 
208 static const unsigned int mc13892_vusb2[] = {
209 	2400000, 2600000, 2700000, 2775000,
210 };
211 
212 static const unsigned int mc13892_vvideo[] = {
213 	2700000, 2775000, 2500000, 2600000,
214 };
215 
216 static const unsigned int mc13892_vaudio[] = {
217 	2300000, 2500000, 2775000, 3000000,
218 };
219 
220 static const unsigned int mc13892_vcam[] = {
221 	2500000, 2600000, 2750000, 3000000,
222 };
223 
224 static const unsigned int mc13892_vgen1[] = {
225 	1200000, 1500000, 2775000, 3150000,
226 };
227 
228 static const unsigned int mc13892_vgen2[] = {
229 	1200000, 1500000, 1600000, 1800000,
230 	2700000, 2800000, 3000000, 3150000,
231 };
232 
233 static const unsigned int mc13892_vgen3[] = {
234 	1800000, 2900000,
235 };
236 
237 static const unsigned int mc13892_vusb[] = {
238 	3300000,
239 };
240 
241 static const unsigned int mc13892_gpo[] = {
242 	2750000,
243 };
244 
245 static const unsigned int mc13892_pwgtdrv[] = {
246 	5000000,
247 };
248 
249 static struct regulator_ops mc13892_gpo_regulator_ops;
250 static struct regulator_ops mc13892_sw_regulator_ops;
251 
252 
253 #define MC13892_FIXED_DEFINE(name, reg, voltages)		\
254 	MC13xxx_FIXED_DEFINE(MC13892_, name, reg, voltages,	\
255 			mc13xxx_fixed_regulator_ops)
256 
257 #define MC13892_GPO_DEFINE(name, reg, voltages)			\
258 	MC13xxx_GPO_DEFINE(MC13892_, name, reg, voltages,	\
259 			mc13892_gpo_regulator_ops)
260 
261 #define MC13892_SW_DEFINE(name, reg, vsel_reg, voltages)	\
262 	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
263 			mc13892_sw_regulator_ops)
264 
265 #define MC13892_DEFINE_REGU(name, reg, vsel_reg, voltages)	\
266 	MC13xxx_DEFINE(MC13892_, name, reg, vsel_reg, voltages, \
267 			mc13xxx_regulator_ops)
268 
269 static struct mc13xxx_regulator mc13892_regulators[] = {
270 	MC13892_DEFINE_REGU(VCOINCELL, POWERCTL0, POWERCTL0, mc13892_vcoincell),
271 	MC13892_SW_DEFINE(SW1, SWITCHERS0, SWITCHERS0, mc13892_sw1),
272 	MC13892_SW_DEFINE(SW2, SWITCHERS1, SWITCHERS1, mc13892_sw),
273 	MC13892_SW_DEFINE(SW3, SWITCHERS2, SWITCHERS2, mc13892_sw),
274 	MC13892_SW_DEFINE(SW4, SWITCHERS3, SWITCHERS3, mc13892_sw),
275 	MC13892_FIXED_DEFINE(SWBST, SWITCHERS5, mc13892_swbst),
276 	MC13892_FIXED_DEFINE(VIOHI, REGULATORMODE0, mc13892_viohi),
277 	MC13892_DEFINE_REGU(VPLL, REGULATORMODE0, REGULATORSETTING0,
278 		mc13892_vpll),
279 	MC13892_DEFINE_REGU(VDIG, REGULATORMODE0, REGULATORSETTING0,
280 		mc13892_vdig),
281 	MC13892_DEFINE_REGU(VSD, REGULATORMODE1, REGULATORSETTING1,
282 		mc13892_vsd),
283 	MC13892_DEFINE_REGU(VUSB2, REGULATORMODE0, REGULATORSETTING0,
284 		mc13892_vusb2),
285 	MC13892_DEFINE_REGU(VVIDEO, REGULATORMODE1, REGULATORSETTING1,
286 		mc13892_vvideo),
287 	MC13892_DEFINE_REGU(VAUDIO, REGULATORMODE1, REGULATORSETTING1,
288 		mc13892_vaudio),
289 	MC13892_DEFINE_REGU(VCAM, REGULATORMODE1, REGULATORSETTING0,
290 		mc13892_vcam),
291 	MC13892_DEFINE_REGU(VGEN1, REGULATORMODE0, REGULATORSETTING0,
292 		mc13892_vgen1),
293 	MC13892_DEFINE_REGU(VGEN2, REGULATORMODE0, REGULATORSETTING0,
294 		mc13892_vgen2),
295 	MC13892_DEFINE_REGU(VGEN3, REGULATORMODE1, REGULATORSETTING0,
296 		mc13892_vgen3),
297 	MC13892_FIXED_DEFINE(VUSB, USB1, mc13892_vusb),
298 	MC13892_GPO_DEFINE(GPO1, POWERMISC, mc13892_gpo),
299 	MC13892_GPO_DEFINE(GPO2, POWERMISC, mc13892_gpo),
300 	MC13892_GPO_DEFINE(GPO3, POWERMISC, mc13892_gpo),
301 	MC13892_GPO_DEFINE(GPO4, POWERMISC, mc13892_gpo),
302 	MC13892_GPO_DEFINE(PWGT1SPI, POWERMISC, mc13892_pwgtdrv),
303 	MC13892_GPO_DEFINE(PWGT2SPI, POWERMISC, mc13892_pwgtdrv),
304 };
305 
306 static int mc13892_powermisc_rmw(struct mc13xxx_regulator_priv *priv, u32 mask,
307 				 u32 val)
308 {
309 	struct mc13xxx *mc13892 = priv->mc13xxx;
310 	int ret;
311 	u32 valread;
312 
313 	BUG_ON(val & ~mask);
314 
315 	mc13xxx_lock(priv->mc13xxx);
316 	ret = mc13xxx_reg_read(mc13892, MC13892_POWERMISC, &valread);
317 	if (ret)
318 		goto out;
319 
320 	/* Update the stored state for Power Gates. */
321 	priv->powermisc_pwgt_state =
322 		(priv->powermisc_pwgt_state & ~mask) | val;
323 	priv->powermisc_pwgt_state &= MC13892_POWERMISC_PWGTSPI_M;
324 
325 	/* Construct the new register value */
326 	valread = (valread & ~mask) | val;
327 	/* Overwrite the PWGTxEN with the stored version */
328 	valread = (valread & ~MC13892_POWERMISC_PWGTSPI_M) |
329 		priv->powermisc_pwgt_state;
330 
331 	ret = mc13xxx_reg_write(mc13892, MC13892_POWERMISC, valread);
332 out:
333 	mc13xxx_unlock(priv->mc13xxx);
334 	return ret;
335 }
336 
337 static int mc13892_gpo_regulator_enable(struct regulator_dev *rdev)
338 {
339 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
340 	int id = rdev_get_id(rdev);
341 	u32 en_val = mc13892_regulators[id].enable_bit;
342 	u32 mask = mc13892_regulators[id].enable_bit;
343 
344 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
345 
346 	/* Power Gate enable value is 0 */
347 	if (id == MC13892_PWGT1SPI || id == MC13892_PWGT2SPI)
348 		en_val = 0;
349 
350 	if (id == MC13892_GPO4)
351 		mask |= MC13892_POWERMISC_GPO4ADINEN;
352 
353 	return mc13892_powermisc_rmw(priv, mask, en_val);
354 }
355 
356 static int mc13892_gpo_regulator_disable(struct regulator_dev *rdev)
357 {
358 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
359 	int id = rdev_get_id(rdev);
360 	u32 dis_val = 0;
361 
362 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
363 
364 	/* Power Gate disable value is 1 */
365 	if (id == MC13892_PWGT1SPI || id == MC13892_PWGT2SPI)
366 		dis_val = mc13892_regulators[id].enable_bit;
367 
368 	return mc13892_powermisc_rmw(priv, mc13892_regulators[id].enable_bit,
369 		dis_val);
370 }
371 
372 static int mc13892_gpo_regulator_is_enabled(struct regulator_dev *rdev)
373 {
374 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
375 	int ret, id = rdev_get_id(rdev);
376 	unsigned int val;
377 
378 	mc13xxx_lock(priv->mc13xxx);
379 	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
380 	mc13xxx_unlock(priv->mc13xxx);
381 
382 	if (ret)
383 		return ret;
384 
385 	/* Power Gates state is stored in powermisc_pwgt_state
386 	 * where the meaning of bits is negated */
387 	val = (val & ~MC13892_POWERMISC_PWGTSPI_M) |
388 		(priv->powermisc_pwgt_state ^ MC13892_POWERMISC_PWGTSPI_M);
389 
390 	return (val & mc13892_regulators[id].enable_bit) != 0;
391 }
392 
393 
394 static struct regulator_ops mc13892_gpo_regulator_ops = {
395 	.enable = mc13892_gpo_regulator_enable,
396 	.disable = mc13892_gpo_regulator_disable,
397 	.is_enabled = mc13892_gpo_regulator_is_enabled,
398 	.list_voltage = regulator_list_voltage_table,
399 	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
400 };
401 
402 static int mc13892_sw_regulator_get_voltage_sel(struct regulator_dev *rdev)
403 {
404 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
405 	int ret, id = rdev_get_id(rdev);
406 	unsigned int val, selector;
407 
408 	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
409 
410 	mc13xxx_lock(priv->mc13xxx);
411 	ret = mc13xxx_reg_read(priv->mc13xxx,
412 		mc13892_regulators[id].vsel_reg, &val);
413 	mc13xxx_unlock(priv->mc13xxx);
414 	if (ret)
415 		return ret;
416 
417 	/*
418 	 * Figure out if the HI bit is set inside the switcher mode register
419 	 * since this means the selector value we return is at a different
420 	 * offset into the selector table.
421 	 *
422 	 * According to the MC13892 documentation note 59 (Table 47) the SW1
423 	 * buck switcher does not support output range programming therefore
424 	 * the HI bit must always remain 0. So do not do anything strange if
425 	 * our register is MC13892_SWITCHERS0.
426 	 */
427 
428 	selector = val & mc13892_regulators[id].vsel_mask;
429 
430 	if ((mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) &&
431 	    (val & MC13892_SWITCHERS0_SWxHI)) {
432 		selector += MC13892_SWxHI_SEL_OFFSET;
433 	}
434 
435 	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: 0x%08x selector: %d\n",
436 			__func__, id, val, selector);
437 
438 	return selector;
439 }
440 
441 static int mc13892_sw_regulator_set_voltage_sel(struct regulator_dev *rdev,
442 						unsigned selector)
443 {
444 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
445 	int volt, mask, id = rdev_get_id(rdev);
446 	u32 reg_value;
447 	int ret;
448 
449 	volt = rdev->desc->volt_table[selector];
450 	mask = mc13892_regulators[id].vsel_mask;
451 	reg_value = selector;
452 
453 	/*
454 	 * Don't mess with the HI bit or support HI voltage offsets for SW1.
455 	 *
456 	 * Since the get_voltage_sel callback has given a fudged value for
457 	 * the selector offset, we need to back out that offset if HI is
458 	 * to be set so we write the correct value to the register.
459 	 *
460 	 * The HI bit addition and selector offset handling COULD be more
461 	 * complicated by shifting and masking off the voltage selector part
462 	 * of the register then logical OR it back in, but since the selector
463 	 * is at bits 4:0 there is very little point. This makes the whole
464 	 * thing more readable and we do far less work.
465 	 */
466 
467 	if (mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) {
468 		mask |= MC13892_SWITCHERS0_SWxHI;
469 
470 		if (volt > 1375000) {
471 			reg_value -= MC13892_SWxHI_SEL_OFFSET;
472 			reg_value |= MC13892_SWITCHERS0_SWxHI;
473 		} else {
474 			reg_value &= ~MC13892_SWITCHERS0_SWxHI;
475 		}
476 	}
477 
478 	mc13xxx_lock(priv->mc13xxx);
479 	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].vsel_reg,
480 			      mask, reg_value);
481 	mc13xxx_unlock(priv->mc13xxx);
482 
483 	return ret;
484 }
485 
486 static struct regulator_ops mc13892_sw_regulator_ops = {
487 	.list_voltage = regulator_list_voltage_table,
488 	.map_voltage = regulator_map_voltage_ascend,
489 	.set_voltage_sel = mc13892_sw_regulator_set_voltage_sel,
490 	.get_voltage_sel = mc13892_sw_regulator_get_voltage_sel,
491 };
492 
493 static int mc13892_vcam_set_mode(struct regulator_dev *rdev, unsigned int mode)
494 {
495 	unsigned int en_val = 0;
496 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
497 	int ret, id = rdev_get_id(rdev);
498 
499 	if (mode == REGULATOR_MODE_FAST)
500 		en_val = MC13892_REGULATORMODE1_VCAMCONFIGEN;
501 
502 	mc13xxx_lock(priv->mc13xxx);
503 	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].reg,
504 		MC13892_REGULATORMODE1_VCAMCONFIGEN, en_val);
505 	mc13xxx_unlock(priv->mc13xxx);
506 
507 	return ret;
508 }
509 
510 static unsigned int mc13892_vcam_get_mode(struct regulator_dev *rdev)
511 {
512 	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
513 	int ret, id = rdev_get_id(rdev);
514 	unsigned int val;
515 
516 	mc13xxx_lock(priv->mc13xxx);
517 	ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
518 	mc13xxx_unlock(priv->mc13xxx);
519 
520 	if (ret)
521 		return ret;
522 
523 	if (val & MC13892_REGULATORMODE1_VCAMCONFIGEN)
524 		return REGULATOR_MODE_FAST;
525 
526 	return REGULATOR_MODE_NORMAL;
527 }
528 
529 
530 static int mc13892_regulator_probe(struct platform_device *pdev)
531 {
532 	struct mc13xxx_regulator_priv *priv;
533 	struct mc13xxx *mc13892 = dev_get_drvdata(pdev->dev.parent);
534 	struct mc13xxx_regulator_platform_data *pdata =
535 		dev_get_platdata(&pdev->dev);
536 	struct mc13xxx_regulator_init_data *mc13xxx_data;
537 	struct regulator_config config = { };
538 	int i, ret;
539 	int num_regulators = 0;
540 	u32 val;
541 
542 	num_regulators = mc13xxx_get_num_regulators_dt(pdev);
543 
544 	if (num_regulators <= 0 && pdata)
545 		num_regulators = pdata->num_regulators;
546 	if (num_regulators <= 0)
547 		return -EINVAL;
548 
549 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv) +
550 		num_regulators * sizeof(priv->regulators[0]),
551 		GFP_KERNEL);
552 	if (!priv)
553 		return -ENOMEM;
554 
555 	priv->num_regulators = num_regulators;
556 	priv->mc13xxx_regulators = mc13892_regulators;
557 	priv->mc13xxx = mc13892;
558 	platform_set_drvdata(pdev, priv);
559 
560 	mc13xxx_lock(mc13892);
561 	ret = mc13xxx_reg_read(mc13892, MC13892_REVISION, &val);
562 	if (ret)
563 		goto err_unlock;
564 
565 	/* enable switch auto mode (on 2.0A silicon only) */
566 	if ((val & 0x0000FFFF) == 0x45d0) {
567 		ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS4,
568 			MC13892_SWITCHERS4_SW1MODE_M |
569 			MC13892_SWITCHERS4_SW2MODE_M,
570 			MC13892_SWITCHERS4_SW1MODE_AUTO |
571 			MC13892_SWITCHERS4_SW2MODE_AUTO);
572 		if (ret)
573 			goto err_unlock;
574 
575 		ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS5,
576 			MC13892_SWITCHERS5_SW3MODE_M |
577 			MC13892_SWITCHERS5_SW4MODE_M,
578 			MC13892_SWITCHERS5_SW3MODE_AUTO |
579 			MC13892_SWITCHERS5_SW4MODE_AUTO);
580 		if (ret)
581 			goto err_unlock;
582 	}
583 	mc13xxx_unlock(mc13892);
584 
585 	mc13892_regulators[MC13892_VCAM].desc.ops->set_mode
586 		= mc13892_vcam_set_mode;
587 	mc13892_regulators[MC13892_VCAM].desc.ops->get_mode
588 		= mc13892_vcam_get_mode;
589 
590 	mc13xxx_data = mc13xxx_parse_regulators_dt(pdev, mc13892_regulators,
591 					ARRAY_SIZE(mc13892_regulators));
592 
593 	for (i = 0; i < priv->num_regulators; i++) {
594 		struct regulator_init_data *init_data;
595 		struct regulator_desc *desc;
596 		struct device_node *node = NULL;
597 		int id;
598 
599 		if (mc13xxx_data) {
600 			id = mc13xxx_data[i].id;
601 			init_data = mc13xxx_data[i].init_data;
602 			node = mc13xxx_data[i].node;
603 		} else {
604 			id = pdata->regulators[i].id;
605 			init_data = pdata->regulators[i].init_data;
606 		}
607 		desc = &mc13892_regulators[id].desc;
608 
609 		config.dev = &pdev->dev;
610 		config.init_data = init_data;
611 		config.driver_data = priv;
612 		config.of_node = node;
613 
614 		priv->regulators[i] = devm_regulator_register(&pdev->dev, desc,
615 							      &config);
616 		if (IS_ERR(priv->regulators[i])) {
617 			dev_err(&pdev->dev, "failed to register regulator %s\n",
618 				mc13892_regulators[i].desc.name);
619 			return PTR_ERR(priv->regulators[i]);
620 		}
621 	}
622 
623 	return 0;
624 
625 err_unlock:
626 	mc13xxx_unlock(mc13892);
627 	return ret;
628 }
629 
630 static struct platform_driver mc13892_regulator_driver = {
631 	.driver	= {
632 		.name	= "mc13892-regulator",
633 		.owner	= THIS_MODULE,
634 	},
635 	.probe	= mc13892_regulator_probe,
636 };
637 
638 static int __init mc13892_regulator_init(void)
639 {
640 	return platform_driver_register(&mc13892_regulator_driver);
641 }
642 subsys_initcall(mc13892_regulator_init);
643 
644 static void __exit mc13892_regulator_exit(void)
645 {
646 	platform_driver_unregister(&mc13892_regulator_driver);
647 }
648 module_exit(mc13892_regulator_exit);
649 
650 MODULE_LICENSE("GPL v2");
651 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
652 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13892 PMIC");
653 MODULE_ALIAS("platform:mc13892-regulator");
654