501 lines
13 KiB
C
501 lines
13 KiB
C
/*
|
|
* twl4030-regulator.c -- support regulators in twl4030 family chips
|
|
*
|
|
* Copyright (C) 2008 David Brownell
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/err.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/regulator/machine.h>
|
|
#include <linux/i2c/twl4030.h>
|
|
|
|
|
|
/*
|
|
* The TWL4030/TW5030/TPS659x0 family chips include power management, a
|
|
* USB OTG transceiver, an RTC, ADC, PWM, and lots more. Some versions
|
|
* include an audio codec, battery charger, and more voltage regulators.
|
|
* These chips are often used in OMAP-based systems.
|
|
*
|
|
* This driver implements software-based resource control for various
|
|
* voltage regulators. This is usually augmented with state machine
|
|
* based control.
|
|
*/
|
|
|
|
struct twlreg_info {
|
|
/* start of regulator's PM_RECEIVER control register bank */
|
|
u8 base;
|
|
|
|
/* twl4030 resource ID, for resource control state machine */
|
|
u8 id;
|
|
|
|
/* voltage in mV = table[VSEL]; table_len must be a power-of-two */
|
|
u8 table_len;
|
|
const u16 *table;
|
|
|
|
/* chip constraints on regulator behavior */
|
|
u16 min_mV;
|
|
|
|
/* used by regulator core */
|
|
struct regulator_desc desc;
|
|
};
|
|
|
|
|
|
/* LDO control registers ... offset is from the base of its register bank.
|
|
* The first three registers of all power resource banks help hardware to
|
|
* manage the various resource groups.
|
|
*/
|
|
#define VREG_GRP 0
|
|
#define VREG_TYPE 1
|
|
#define VREG_REMAP 2
|
|
#define VREG_DEDICATED 3 /* LDO control */
|
|
|
|
|
|
static inline int
|
|
twl4030reg_read(struct twlreg_info *info, unsigned offset)
|
|
{
|
|
u8 value;
|
|
int status;
|
|
|
|
status = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER,
|
|
&value, info->base + offset);
|
|
return (status < 0) ? status : value;
|
|
}
|
|
|
|
static inline int
|
|
twl4030reg_write(struct twlreg_info *info, unsigned offset, u8 value)
|
|
{
|
|
return twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
|
|
value, info->base + offset);
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
/* generic power resource operations, which work on all regulators */
|
|
|
|
static int twl4030reg_grp(struct regulator_dev *rdev)
|
|
{
|
|
return twl4030reg_read(rdev_get_drvdata(rdev), VREG_GRP);
|
|
}
|
|
|
|
/*
|
|
* Enable/disable regulators by joining/leaving the P1 (processor) group.
|
|
* We assume nobody else is updating the DEV_GRP registers.
|
|
*/
|
|
|
|
#define P3_GRP BIT(7) /* "peripherals" */
|
|
#define P2_GRP BIT(6) /* secondary processor, modem, etc */
|
|
#define P1_GRP BIT(5) /* CPU/Linux */
|
|
|
|
static int twl4030reg_is_enabled(struct regulator_dev *rdev)
|
|
{
|
|
int state = twl4030reg_grp(rdev);
|
|
|
|
if (state < 0)
|
|
return state;
|
|
|
|
return (state & P1_GRP) != 0;
|
|
}
|
|
|
|
static int twl4030reg_enable(struct regulator_dev *rdev)
|
|
{
|
|
struct twlreg_info *info = rdev_get_drvdata(rdev);
|
|
int grp;
|
|
|
|
grp = twl4030reg_read(info, VREG_GRP);
|
|
if (grp < 0)
|
|
return grp;
|
|
|
|
grp |= P1_GRP;
|
|
return twl4030reg_write(info, VREG_GRP, grp);
|
|
}
|
|
|
|
static int twl4030reg_disable(struct regulator_dev *rdev)
|
|
{
|
|
struct twlreg_info *info = rdev_get_drvdata(rdev);
|
|
int grp;
|
|
|
|
grp = twl4030reg_read(info, VREG_GRP);
|
|
if (grp < 0)
|
|
return grp;
|
|
|
|
grp &= ~P1_GRP;
|
|
return twl4030reg_write(info, VREG_GRP, grp);
|
|
}
|
|
|
|
static int twl4030reg_get_status(struct regulator_dev *rdev)
|
|
{
|
|
int state = twl4030reg_grp(rdev);
|
|
|
|
if (state < 0)
|
|
return state;
|
|
state &= 0x0f;
|
|
|
|
/* assume state != WARM_RESET; we'd not be running... */
|
|
if (!state)
|
|
return REGULATOR_STATUS_OFF;
|
|
return (state & BIT(3))
|
|
? REGULATOR_STATUS_NORMAL
|
|
: REGULATOR_STATUS_STANDBY;
|
|
}
|
|
|
|
static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
|
|
{
|
|
struct twlreg_info *info = rdev_get_drvdata(rdev);
|
|
unsigned message;
|
|
int status;
|
|
|
|
/* We can only set the mode through state machine commands... */
|
|
switch (mode) {
|
|
case REGULATOR_MODE_NORMAL:
|
|
message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
|
|
break;
|
|
case REGULATOR_MODE_STANDBY:
|
|
message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Ensure the resource is associated with some group */
|
|
status = twl4030reg_grp(rdev);
|
|
if (status < 0)
|
|
return status;
|
|
if (!(status & (P3_GRP | P2_GRP | P1_GRP)))
|
|
return -EACCES;
|
|
|
|
status = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
|
|
message >> 8, 0x15 /* PB_WORD_MSB */ );
|
|
if (status >= 0)
|
|
return status;
|
|
|
|
return twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
|
|
message, 0x16 /* PB_WORD_LSB */ );
|
|
}
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Support for adjustable-voltage LDOs uses a four bit (or less) voltage
|
|
* select field in its control register. We use tables indexed by VSEL
|
|
* to record voltages in milliVolts. (Accuracy is about three percent.)
|
|
*
|
|
* Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
|
|
* currently handled by listing two slightly different VAUX2 regulators,
|
|
* only one of which will be configured.
|
|
*
|
|
* VSEL values documented as "TI cannot support these values" are flagged
|
|
* in these tables as UNSUP() values; we normally won't assign them.
|
|
*
|
|
* VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
|
|
* TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
|
|
*/
|
|
#ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
|
|
#define UNSUP_MASK 0x0000
|
|
#else
|
|
#define UNSUP_MASK 0x8000
|
|
#endif
|
|
|
|
#define UNSUP(x) (UNSUP_MASK | (x))
|
|
#define IS_UNSUP(x) (UNSUP_MASK & (x))
|
|
#define LDO_MV(x) (~UNSUP_MASK & (x))
|
|
|
|
|
|
static const u16 VAUX1_VSEL_table[] = {
|
|
UNSUP(1500), UNSUP(1800), 2500, 2800,
|
|
3000, 3000, 3000, 3000,
|
|
};
|
|
static const u16 VAUX2_4030_VSEL_table[] = {
|
|
UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
|
|
1500, 1800, UNSUP(1850), 2500,
|
|
UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
|
|
UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
|
|
};
|
|
static const u16 VAUX2_VSEL_table[] = {
|
|
1700, 1700, 1900, 1300,
|
|
1500, 1800, 2000, 2500,
|
|
2100, 2800, 2200, 2300,
|
|
2400, 2400, 2400, 2400,
|
|
};
|
|
static const u16 VAUX3_VSEL_table[] = {
|
|
1500, 1800, 2500, 2800,
|
|
3000, 3000, 3000, 3000,
|
|
};
|
|
static const u16 VAUX4_VSEL_table[] = {
|
|
700, 1000, 1200, UNSUP(1300),
|
|
1500, 1800, UNSUP(1850), 2500,
|
|
UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
|
|
UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
|
|
};
|
|
static const u16 VMMC1_VSEL_table[] = {
|
|
1850, 2850, 3000, 3150,
|
|
};
|
|
static const u16 VMMC2_VSEL_table[] = {
|
|
UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
|
|
UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
|
|
2600, 2800, 2850, 3000,
|
|
3150, 3150, 3150, 3150,
|
|
};
|
|
static const u16 VPLL1_VSEL_table[] = {
|
|
1000, 1200, 1300, 1800,
|
|
UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
|
|
};
|
|
static const u16 VPLL2_VSEL_table[] = {
|
|
700, 1000, 1200, 1300,
|
|
UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
|
|
UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
|
|
UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
|
|
};
|
|
static const u16 VSIM_VSEL_table[] = {
|
|
UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
|
|
2800, 3000, 3000, 3000,
|
|
};
|
|
static const u16 VDAC_VSEL_table[] = {
|
|
1200, 1300, 1800, 1800,
|
|
};
|
|
|
|
|
|
static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
|
|
{
|
|
struct twlreg_info *info = rdev_get_drvdata(rdev);
|
|
int mV = info->table[index];
|
|
|
|
return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
|
|
}
|
|
|
|
static int
|
|
twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
|
|
{
|
|
struct twlreg_info *info = rdev_get_drvdata(rdev);
|
|
int vsel;
|
|
|
|
for (vsel = 0; vsel < info->table_len; vsel++) {
|
|
int mV = info->table[vsel];
|
|
int uV;
|
|
|
|
if (IS_UNSUP(mV))
|
|
continue;
|
|
uV = LDO_MV(mV) * 1000;
|
|
|
|
/* REVISIT for VAUX2, first match may not be best/lowest */
|
|
|
|
/* use the first in-range value */
|
|
if (min_uV <= uV && uV <= max_uV)
|
|
return twl4030reg_write(info, VREG_DEDICATED, vsel);
|
|
}
|
|
|
|
return -EDOM;
|
|
}
|
|
|
|
static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
|
|
{
|
|
struct twlreg_info *info = rdev_get_drvdata(rdev);
|
|
int vsel = twl4030reg_read(info, VREG_DEDICATED);
|
|
|
|
if (vsel < 0)
|
|
return vsel;
|
|
|
|
vsel &= info->table_len - 1;
|
|
return LDO_MV(info->table[vsel]) * 1000;
|
|
}
|
|
|
|
static struct regulator_ops twl4030ldo_ops = {
|
|
.list_voltage = twl4030ldo_list_voltage,
|
|
|
|
.set_voltage = twl4030ldo_set_voltage,
|
|
.get_voltage = twl4030ldo_get_voltage,
|
|
|
|
.enable = twl4030reg_enable,
|
|
.disable = twl4030reg_disable,
|
|
.is_enabled = twl4030reg_is_enabled,
|
|
|
|
.set_mode = twl4030reg_set_mode,
|
|
|
|
.get_status = twl4030reg_get_status,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Fixed voltage LDOs don't have a VSEL field to update.
|
|
*/
|
|
static int twl4030fixed_list_voltage(struct regulator_dev *rdev, unsigned index)
|
|
{
|
|
struct twlreg_info *info = rdev_get_drvdata(rdev);
|
|
|
|
return info->min_mV * 1000;
|
|
}
|
|
|
|
static int twl4030fixed_get_voltage(struct regulator_dev *rdev)
|
|
{
|
|
struct twlreg_info *info = rdev_get_drvdata(rdev);
|
|
|
|
return info->min_mV * 1000;
|
|
}
|
|
|
|
static struct regulator_ops twl4030fixed_ops = {
|
|
.list_voltage = twl4030fixed_list_voltage,
|
|
|
|
.get_voltage = twl4030fixed_get_voltage,
|
|
|
|
.enable = twl4030reg_enable,
|
|
.disable = twl4030reg_disable,
|
|
.is_enabled = twl4030reg_is_enabled,
|
|
|
|
.set_mode = twl4030reg_set_mode,
|
|
|
|
.get_status = twl4030reg_get_status,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------*/
|
|
|
|
#define TWL_ADJUSTABLE_LDO(label, offset, num) { \
|
|
.base = offset, \
|
|
.id = num, \
|
|
.table_len = ARRAY_SIZE(label##_VSEL_table), \
|
|
.table = label##_VSEL_table, \
|
|
.desc = { \
|
|
.name = #label, \
|
|
.id = TWL4030_REG_##label, \
|
|
.n_voltages = ARRAY_SIZE(label##_VSEL_table), \
|
|
.ops = &twl4030ldo_ops, \
|
|
.type = REGULATOR_VOLTAGE, \
|
|
.owner = THIS_MODULE, \
|
|
}, \
|
|
}
|
|
|
|
#define TWL_FIXED_LDO(label, offset, mVolts, num) { \
|
|
.base = offset, \
|
|
.id = num, \
|
|
.min_mV = mVolts, \
|
|
.desc = { \
|
|
.name = #label, \
|
|
.id = TWL4030_REG_##label, \
|
|
.n_voltages = 1, \
|
|
.ops = &twl4030fixed_ops, \
|
|
.type = REGULATOR_VOLTAGE, \
|
|
.owner = THIS_MODULE, \
|
|
}, \
|
|
}
|
|
|
|
/*
|
|
* We list regulators here if systems need some level of
|
|
* software control over them after boot.
|
|
*/
|
|
static struct twlreg_info twl4030_regs[] = {
|
|
TWL_ADJUSTABLE_LDO(VAUX1, 0x17, 1),
|
|
TWL_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2),
|
|
TWL_ADJUSTABLE_LDO(VAUX2, 0x1b, 2),
|
|
TWL_ADJUSTABLE_LDO(VAUX3, 0x1f, 3),
|
|
TWL_ADJUSTABLE_LDO(VAUX4, 0x23, 4),
|
|
TWL_ADJUSTABLE_LDO(VMMC1, 0x27, 5),
|
|
TWL_ADJUSTABLE_LDO(VMMC2, 0x2b, 6),
|
|
/*
|
|
TWL_ADJUSTABLE_LDO(VPLL1, 0x2f, 7),
|
|
*/
|
|
TWL_ADJUSTABLE_LDO(VPLL2, 0x33, 8),
|
|
TWL_ADJUSTABLE_LDO(VSIM, 0x37, 9),
|
|
TWL_ADJUSTABLE_LDO(VDAC, 0x3b, 10),
|
|
/*
|
|
TWL_ADJUSTABLE_LDO(VINTANA1, 0x3f, 11),
|
|
TWL_ADJUSTABLE_LDO(VINTANA2, 0x43, 12),
|
|
TWL_ADJUSTABLE_LDO(VINTDIG, 0x47, 13),
|
|
TWL_SMPS(VIO, 0x4b, 14),
|
|
TWL_SMPS(VDD1, 0x55, 15),
|
|
TWL_SMPS(VDD2, 0x63, 16),
|
|
*/
|
|
TWL_FIXED_LDO(VUSB1V5, 0x71, 1500, 17),
|
|
TWL_FIXED_LDO(VUSB1V8, 0x74, 1800, 18),
|
|
TWL_FIXED_LDO(VUSB3V1, 0x77, 3100, 19),
|
|
/* VUSBCP is managed *only* by the USB subchip */
|
|
};
|
|
|
|
static int twl4030reg_probe(struct platform_device *pdev)
|
|
{
|
|
int i;
|
|
struct twlreg_info *info;
|
|
struct regulator_init_data *initdata;
|
|
struct regulation_constraints *c;
|
|
struct regulator_dev *rdev;
|
|
|
|
for (i = 0, info = NULL; i < ARRAY_SIZE(twl4030_regs); i++) {
|
|
if (twl4030_regs[i].desc.id != pdev->id)
|
|
continue;
|
|
info = twl4030_regs + i;
|
|
break;
|
|
}
|
|
if (!info)
|
|
return -ENODEV;
|
|
|
|
initdata = pdev->dev.platform_data;
|
|
if (!initdata)
|
|
return -EINVAL;
|
|
|
|
/* Constrain board-specific capabilities according to what
|
|
* this driver and the chip itself can actually do.
|
|
*/
|
|
c = &initdata->constraints;
|
|
c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
|
|
c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
|
|
| REGULATOR_CHANGE_MODE
|
|
| REGULATOR_CHANGE_STATUS;
|
|
|
|
rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
|
|
if (IS_ERR(rdev)) {
|
|
dev_err(&pdev->dev, "can't register %s, %ld\n",
|
|
info->desc.name, PTR_ERR(rdev));
|
|
return PTR_ERR(rdev);
|
|
}
|
|
platform_set_drvdata(pdev, rdev);
|
|
|
|
/* NOTE: many regulators support short-circuit IRQs (presentable
|
|
* as REGULATOR_OVER_CURRENT notifications?) configured via:
|
|
* - SC_CONFIG
|
|
* - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
|
|
* - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
|
|
* - IT_CONFIG
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit twl4030reg_remove(struct platform_device *pdev)
|
|
{
|
|
regulator_unregister(platform_get_drvdata(pdev));
|
|
return 0;
|
|
}
|
|
|
|
MODULE_ALIAS("platform:twl4030_reg");
|
|
|
|
static struct platform_driver twl4030reg_driver = {
|
|
.probe = twl4030reg_probe,
|
|
.remove = __devexit_p(twl4030reg_remove),
|
|
/* NOTE: short name, to work around driver model truncation of
|
|
* "twl4030_regulator.12" (and friends) to "twl4030_regulator.1".
|
|
*/
|
|
.driver.name = "twl4030_reg",
|
|
.driver.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init twl4030reg_init(void)
|
|
{
|
|
return platform_driver_register(&twl4030reg_driver);
|
|
}
|
|
subsys_initcall(twl4030reg_init);
|
|
|
|
static void __exit twl4030reg_exit(void)
|
|
{
|
|
platform_driver_unregister(&twl4030reg_driver);
|
|
}
|
|
module_exit(twl4030reg_exit)
|
|
|
|
MODULE_DESCRIPTION("TWL4030 regulator driver");
|
|
MODULE_LICENSE("GPL");
|