2 * twl4030-regulator.c -- support regulators in twl4030 family chips
4 * Copyright (C) 2008 David Brownell
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/err.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/machine.h>
18 #include <linux/i2c/twl4030.h>
22 * The TWL4030/TW5030/TPS659x0 family chips include power management, a
23 * USB OTG transceiver, an RTC, ADC, PWM, and lots more. Some versions
24 * include an audio codec, battery charger, and more voltage regulators.
25 * These chips are often used in OMAP-based systems.
27 * This driver implements software-based resource control for various
28 * voltage regulators. This is usually augmented with state machine
33 /* start of regulator's PM_RECEIVER control register bank */
36 /* twl4030 resource ID, for resource control state machine */
39 /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
43 /* chip constraints on regulator behavior */
47 /* used by regulator core */
48 struct regulator_desc desc;
51 #ifndef REGULATOR_MODE_OFF
52 #define REGULATOR_MODE_OFF 0
56 /* LDO control registers ... offset is from the base of its register bank.
57 * The first three registers of all power resource banks help hardware to
58 * manage the various resource groups.
63 #define VREG_DEDICATED 3 /* LDO control */
67 twl4030reg_read(struct twlreg_info *info, unsigned offset)
72 status = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER,
73 &value, info->base + offset);
74 return (status < 0) ? status : value;
78 twl4030reg_write(struct twlreg_info *info, unsigned offset, u8 value)
80 return twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
81 value, info->base + offset);
84 /*----------------------------------------------------------------------*/
86 /* generic power resource operations, which work on all regulators */
88 static int twl4030reg_grp(struct regulator_dev *rdev)
90 return twl4030reg_read(rdev_get_drvdata(rdev), VREG_GRP);
93 static int twl4030reg_is_enabled(struct regulator_dev *rdev)
95 int state = twl4030reg_grp(rdev);
100 /* resource state == OFF (vs SLEEP or ACTIVE) */
101 return (state & 0x0f) != 0;
105 * Enable/disable regulators by joining/leaving the P1 (processor) group.
106 * We assume nobody else is updating the DEV_GRP registers.
109 #define P3_GRP BIT(7) /* "peripherals" */
110 #define P2_GRP BIT(6) /* secondary processor, modem, etc */
111 #define P1_GRP BIT(5) /* CPU/Linux */
113 static int twl4030reg_enable(struct regulator_dev *rdev)
115 struct twlreg_info *info = rdev_get_drvdata(rdev);
118 grp = twl4030reg_read(info, VREG_GRP);
123 return twl4030reg_write(info, VREG_GRP, grp);
126 static int twl4030reg_disable(struct regulator_dev *rdev)
128 struct twlreg_info *info = rdev_get_drvdata(rdev);
131 grp = twl4030reg_read(info, VREG_GRP);
136 return twl4030reg_write(info, VREG_GRP, grp);
139 static unsigned twl4030reg_get_mode(struct regulator_dev *rdev)
141 int state = twl4030reg_grp(rdev);
147 /* assume state != WARM_RESET; we'd not be running... */
149 return REGULATOR_MODE_OFF;
150 return (state & BIT(3))
151 ? REGULATOR_MODE_NORMAL
152 : REGULATOR_MODE_STANDBY;
155 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
157 struct twlreg_info *info = rdev_get_drvdata(rdev);
161 /* We can only set the mode through state machine commands... */
163 case REGULATOR_MODE_NORMAL:
164 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
166 case REGULATOR_MODE_STANDBY:
167 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
173 /* Ensure the resource is associated with some group */
174 status = twl4030reg_grp(rdev);
177 if (!(status & (P3_GRP | P2_GRP | P1_GRP)))
180 status = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
181 message >> 8, 0x15 /* PB_WORD_MSB */ );
185 return twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
186 message, 0x16 /* PB_WORD_LSB */ );
189 /*----------------------------------------------------------------------*/
192 * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
193 * select field in its control register. We use tables indexed by VSEL
194 * to record voltages in milliVolts. (Accuracy is about three percent.)
196 * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
197 * currently handled by listing two slightly different VAUX2 regulators,
198 * only one of which will be configured.
200 * VSEL values documented as "TI cannot support these values" are flagged
201 * in these tables as UNSUP() values; we normally won't assign them.
203 #ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
204 #define UNSUP_MASK 0x0000
206 #define UNSUP_MASK 0x8000
209 #define UNSUP(x) (UNSUP_MASK | (x))
210 #define IS_UNSUP(x) (UNSUP_MASK & (x))
211 #define LDO_MV(x) (~UNSUP_MASK & (x))
214 static const u16 VAUX1_VSEL_table[] = {
215 UNSUP(1500), UNSUP(1800), 2500, 2800,
216 3000, 3000, 3000, 3000,
218 static const u16 VAUX2_4030_VSEL_table[] = {
219 UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
220 1500, 1800, UNSUP(1850), 2500,
221 UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
222 UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
224 static const u16 VAUX2_VSEL_table[] = {
225 1700, 1700, 1900, 1300,
226 1500, 1800, 2000, 2500,
227 2100, 2800, 2200, 2300,
228 2400, 2400, 2400, 2400,
230 static const u16 VAUX3_VSEL_table[] = {
231 1500, 1800, 2500, 2800,
232 UNSUP(3000), UNSUP(3000), UNSUP(3000), UNSUP(3000),
234 static const u16 VAUX4_VSEL_table[] = {
235 700, 1000, 1200, UNSUP(1300),
236 1500, 1800, UNSUP(1850), 2500,
238 static const u16 VMMC1_VSEL_table[] = {
239 1850, 2850, 3000, 3150,
241 static const u16 VMMC2_VSEL_table[] = {
242 UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
243 UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
244 2600, 2800, 2850, 3000,
245 3150, 3150, 3150, 3150,
247 static const u16 VPLL1_VSEL_table[] = {
248 1000, 1200, 1300, 1800,
249 UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
251 static const u16 VPLL2_VSEL_table[] = {
252 700, 1000, 1200, 1300,
253 UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
254 UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
255 UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
257 static const u16 VSIM_VSEL_table[] = {
258 UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
259 2800, 3000, 3000, 3000,
261 static const u16 VDAC_VSEL_table[] = {
262 1200, 1300, 1800, 1800,
267 twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
269 struct twlreg_info *info = rdev_get_drvdata(rdev);
272 for (vsel = 0; vsel < info->table_len; vsel++) {
273 int mV = info->table[vsel];
278 uV = LDO_MV(mV) * 1000;
280 /* use the first in-range value */
281 if (min_uV <= uV && uV <= max_uV)
282 return twl4030reg_write(info, VREG_DEDICATED, vsel);
288 static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
290 struct twlreg_info *info = rdev_get_drvdata(rdev);
291 int vsel = twl4030reg_read(info, VREG_DEDICATED);
296 vsel &= info->table_len - 1;
297 return LDO_MV(info->table[vsel]) * 1000;
300 static struct regulator_ops twl4030ldo_ops = {
301 .set_voltage = twl4030ldo_set_voltage,
302 .get_voltage = twl4030ldo_get_voltage,
304 .enable = twl4030reg_enable,
305 .disable = twl4030reg_disable,
306 .is_enabled = twl4030reg_is_enabled,
308 .set_mode = twl4030reg_set_mode,
309 .get_mode = twl4030reg_get_mode,
312 /*----------------------------------------------------------------------*/
315 * Fixed voltage LDOs don't have a VSEL field to update.
317 static int twl4030fixed_get_voltage(struct regulator_dev *rdev)
319 struct twlreg_info *info = rdev_get_drvdata(rdev);
321 return info->min_mV * 1000;
324 static struct regulator_ops twl4030fixed_ops = {
325 .get_voltage = twl4030fixed_get_voltage,
327 .enable = twl4030reg_enable,
328 .disable = twl4030reg_disable,
329 .is_enabled = twl4030reg_is_enabled,
331 .set_mode = twl4030reg_set_mode,
332 .get_mode = twl4030reg_get_mode,
335 /*----------------------------------------------------------------------*/
337 #define TWL_ADJUSTABLE_LDO(label, offset, num) { \
340 .table_len = ARRAY_SIZE(label##_VSEL_table), \
341 .table = label##_VSEL_table, \
344 .id = TWL4030_REG_##label, \
345 .ops = &twl4030ldo_ops, \
346 .type = REGULATOR_VOLTAGE, \
347 .owner = THIS_MODULE, \
351 #define TWL_FIXED_LDO(label, offset, mVolts, num) { \
358 .id = TWL4030_REG_##label, \
359 .ops = &twl4030fixed_ops, \
360 .type = REGULATOR_VOLTAGE, \
361 .owner = THIS_MODULE, \
366 * We list regulators here if systems need some level of
367 * software control over them after boot.
369 static struct twlreg_info twl4030_regs[] = {
370 TWL_ADJUSTABLE_LDO(VAUX1, 0x17, 1),
371 TWL_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2),
372 TWL_ADJUSTABLE_LDO(VAUX2, 0x1b, 2),
373 TWL_ADJUSTABLE_LDO(VAUX3, 0x1f, 3),
374 TWL_ADJUSTABLE_LDO(VAUX4, 0x23, 4),
375 TWL_ADJUSTABLE_LDO(VMMC1, 0x27, 5),
376 TWL_ADJUSTABLE_LDO(VMMC2, 0x2b, 6),
378 TWL_ADJUSTABLE_LDO(VPLL1, 0x2f, 7),
379 TWL_ADJUSTABLE_LDO(VPLL2, 0x33, 8),
381 TWL_ADJUSTABLE_LDO(VSIM, 0x37, 9),
382 TWL_ADJUSTABLE_LDO(VDAC, 0x3b, 10),
384 TWL_ADJUSTABLE_LDO(VINTANA1, 0x3f, 11),
385 TWL_ADJUSTABLE_LDO(VINTANA2, 0x43, 12),
386 TWL_ADJUSTABLE_LDO(VINTDIG, 0x47, 13),
387 TWL_SMPS(VIO, 0x4b, 14),
388 TWL_SMPS(VDD1, 0x55, 15),
389 TWL_SMPS(VDD2, 0x63, 16),
391 TWL_FIXED_LDO(VUSB1V5, 0x71, 1500, 17),
392 TWL_FIXED_LDO(VUSB1V8, 0x74, 1800, 18),
393 TWL_FIXED_LDO(VUSB3V1, 0x77, 3100, 19),
394 /* VUSBCP is managed *only* by the USB subchip */
397 static int twl4030reg_probe(struct platform_device *pdev)
400 struct twlreg_info *info;
401 struct regulator_init_data *initdata;
402 struct regulation_constraints *c;
403 struct regulator_dev *rdev;
406 for (i = 0, info = NULL; i < ARRAY_SIZE(twl4030_regs); i++) {
407 if (twl4030_regs[i].desc.id != pdev->id)
409 info = twl4030_regs + i;
410 min_uV = info->min_mV * 1000;
411 max_uV = info->max_mV * 1000;
417 initdata = pdev->dev.platform_data;
421 /* Constrain board-specific capabilities according to what
422 * this driver and the chip itself can actually do.
424 c = &initdata->constraints;
425 if (!c->min_uV || c->min_uV < min_uV)
427 if (!c->max_uV || c->max_uV > max_uV)
429 c->valid_modes_mask &= REGULATOR_MODE_NORMAL
430 | REGULATOR_MODE_STANDBY
431 | REGULATOR_MODE_OFF;
432 c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
433 | REGULATOR_CHANGE_MODE
434 | REGULATOR_CHANGE_STATUS;
436 rdev = regulator_register(&info->desc, &pdev->dev, info);
438 dev_err(&pdev->dev, "can't register %s, %ld\n",
439 info->desc.name, PTR_ERR(rdev));
440 return PTR_ERR(rdev);
442 platform_set_drvdata(pdev, rdev);
444 /* NOTE: many regulators support short-circuit IRQs (presentable
445 * as REGULATOR_OVER_CURRENT notifications?) configured via:
447 * - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
448 * - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
455 static int __devexit twl4030reg_remove(struct platform_device *pdev)
457 regulator_unregister(platform_get_drvdata(pdev));
461 MODULE_ALIAS("platform:twl4030_reg");
463 static struct platform_driver twl4030reg_driver = {
464 .probe = twl4030reg_probe,
465 .remove = __devexit_p(twl4030reg_remove),
466 /* NOTE: short name, to work around driver model truncation of
467 * "twl4030_regulator.12" (and friends) to "twl4030_regulator.1".
469 .driver.name = "twl4030_reg",
470 .driver.owner = THIS_MODULE,
473 static int __init twl4030reg_init(void)
477 /* determine min/max voltage constraints, taking into account
478 * whether set_voltage() will use the "unsupported" settings
480 for (i = 0; i < ARRAY_SIZE(twl4030_regs); i++) {
481 struct twlreg_info *info = twl4030_regs + i;
484 /* fixed-voltage regulators */
485 if (!info->table_len)
488 /* LDO regulators: */
489 for (j = 0, table = info->table;
498 if (info->min_mV == 0 || info->min_mV > mV)
500 if (info->max_mV < mV)
505 return platform_driver_register(&twl4030reg_driver);
507 subsys_initcall(twl4030reg_init);
509 static void __exit twl4030reg_exit(void)
511 platform_driver_unregister(&twl4030reg_driver);
513 module_exit(twl4030reg_exit)
515 MODULE_DESCRIPTION("TWL4030 regulator driver");
516 MODULE_LICENSE("GPL");