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![Adrian Hunter](/assets/img/avatar_default.png)
TWL4030 and TWL5030 support 3.0V on VAUX3. Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
500 lines
13 KiB
C
500 lines
13 KiB
C
/*
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* twl4030-regulator.c -- support regulators in twl4030 family chips
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*
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* Copyright (C) 2008 David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/i2c/twl4030.h>
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/*
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* The TWL4030/TW5030/TPS659x0 family chips include power management, a
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* USB OTG transceiver, an RTC, ADC, PWM, and lots more. Some versions
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* include an audio codec, battery charger, and more voltage regulators.
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* These chips are often used in OMAP-based systems.
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*
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* This driver implements software-based resource control for various
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* voltage regulators. This is usually augmented with state machine
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* based control.
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*/
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struct twlreg_info {
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/* start of regulator's PM_RECEIVER control register bank */
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u8 base;
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/* twl4030 resource ID, for resource control state machine */
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u8 id;
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/* voltage in mV = table[VSEL]; table_len must be a power-of-two */
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u8 table_len;
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const u16 *table;
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/* chip constraints on regulator behavior */
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u16 min_mV;
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/* used by regulator core */
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struct regulator_desc desc;
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};
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/* LDO control registers ... offset is from the base of its register bank.
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* The first three registers of all power resource banks help hardware to
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* manage the various resource groups.
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*/
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#define VREG_GRP 0
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#define VREG_TYPE 1
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#define VREG_REMAP 2
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#define VREG_DEDICATED 3 /* LDO control */
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static inline int
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twl4030reg_read(struct twlreg_info *info, unsigned offset)
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{
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u8 value;
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int status;
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status = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER,
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&value, info->base + offset);
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return (status < 0) ? status : value;
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}
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static inline int
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twl4030reg_write(struct twlreg_info *info, unsigned offset, u8 value)
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{
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return twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
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value, info->base + offset);
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}
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/*----------------------------------------------------------------------*/
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/* generic power resource operations, which work on all regulators */
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static int twl4030reg_grp(struct regulator_dev *rdev)
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{
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return twl4030reg_read(rdev_get_drvdata(rdev), VREG_GRP);
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}
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/*
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* Enable/disable regulators by joining/leaving the P1 (processor) group.
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* We assume nobody else is updating the DEV_GRP registers.
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*/
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#define P3_GRP BIT(7) /* "peripherals" */
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#define P2_GRP BIT(6) /* secondary processor, modem, etc */
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#define P1_GRP BIT(5) /* CPU/Linux */
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static int twl4030reg_is_enabled(struct regulator_dev *rdev)
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{
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int state = twl4030reg_grp(rdev);
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if (state < 0)
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return state;
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return (state & P1_GRP) != 0;
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}
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static int twl4030reg_enable(struct regulator_dev *rdev)
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{
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struct twlreg_info *info = rdev_get_drvdata(rdev);
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int grp;
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grp = twl4030reg_read(info, VREG_GRP);
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if (grp < 0)
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return grp;
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grp |= P1_GRP;
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return twl4030reg_write(info, VREG_GRP, grp);
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}
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static int twl4030reg_disable(struct regulator_dev *rdev)
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{
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struct twlreg_info *info = rdev_get_drvdata(rdev);
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int grp;
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grp = twl4030reg_read(info, VREG_GRP);
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if (grp < 0)
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return grp;
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grp &= ~P1_GRP;
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return twl4030reg_write(info, VREG_GRP, grp);
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}
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static int twl4030reg_get_status(struct regulator_dev *rdev)
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{
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int state = twl4030reg_grp(rdev);
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if (state < 0)
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return state;
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state &= 0x0f;
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/* assume state != WARM_RESET; we'd not be running... */
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if (!state)
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return REGULATOR_STATUS_OFF;
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return (state & BIT(3))
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? REGULATOR_STATUS_NORMAL
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: REGULATOR_STATUS_STANDBY;
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}
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static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
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{
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struct twlreg_info *info = rdev_get_drvdata(rdev);
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unsigned message;
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int status;
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/* We can only set the mode through state machine commands... */
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switch (mode) {
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case REGULATOR_MODE_NORMAL:
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message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
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break;
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case REGULATOR_MODE_STANDBY:
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message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
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break;
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default:
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return -EINVAL;
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}
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/* Ensure the resource is associated with some group */
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status = twl4030reg_grp(rdev);
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if (status < 0)
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return status;
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if (!(status & (P3_GRP | P2_GRP | P1_GRP)))
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return -EACCES;
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status = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
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message >> 8, 0x15 /* PB_WORD_MSB */ );
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if (status >= 0)
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return status;
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return twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
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message, 0x16 /* PB_WORD_LSB */ );
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}
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/*----------------------------------------------------------------------*/
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/*
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* Support for adjustable-voltage LDOs uses a four bit (or less) voltage
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* select field in its control register. We use tables indexed by VSEL
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* to record voltages in milliVolts. (Accuracy is about three percent.)
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*
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* Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
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* currently handled by listing two slightly different VAUX2 regulators,
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* only one of which will be configured.
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*
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* VSEL values documented as "TI cannot support these values" are flagged
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* in these tables as UNSUP() values; we normally won't assign them.
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*
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* VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
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* TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
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*/
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#ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
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#define UNSUP_MASK 0x0000
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#else
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#define UNSUP_MASK 0x8000
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#endif
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#define UNSUP(x) (UNSUP_MASK | (x))
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#define IS_UNSUP(x) (UNSUP_MASK & (x))
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#define LDO_MV(x) (~UNSUP_MASK & (x))
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static const u16 VAUX1_VSEL_table[] = {
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UNSUP(1500), UNSUP(1800), 2500, 2800,
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3000, 3000, 3000, 3000,
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};
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static const u16 VAUX2_4030_VSEL_table[] = {
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UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
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1500, 1800, UNSUP(1850), 2500,
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UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
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UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
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};
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static const u16 VAUX2_VSEL_table[] = {
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1700, 1700, 1900, 1300,
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1500, 1800, 2000, 2500,
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2100, 2800, 2200, 2300,
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2400, 2400, 2400, 2400,
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};
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static const u16 VAUX3_VSEL_table[] = {
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1500, 1800, 2500, 2800,
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3000, 3000, 3000, 3000,
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};
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static const u16 VAUX4_VSEL_table[] = {
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700, 1000, 1200, UNSUP(1300),
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1500, 1800, UNSUP(1850), 2500,
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UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
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UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
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};
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static const u16 VMMC1_VSEL_table[] = {
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1850, 2850, 3000, 3150,
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};
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static const u16 VMMC2_VSEL_table[] = {
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UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
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UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
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2600, 2800, 2850, 3000,
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3150, 3150, 3150, 3150,
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};
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static const u16 VPLL1_VSEL_table[] = {
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1000, 1200, 1300, 1800,
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UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
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};
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static const u16 VPLL2_VSEL_table[] = {
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700, 1000, 1200, 1300,
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UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
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UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
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UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
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};
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static const u16 VSIM_VSEL_table[] = {
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UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
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2800, 3000, 3000, 3000,
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};
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static const u16 VDAC_VSEL_table[] = {
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1200, 1300, 1800, 1800,
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};
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static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
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{
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struct twlreg_info *info = rdev_get_drvdata(rdev);
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int mV = info->table[index];
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return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
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}
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static int
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twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
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{
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struct twlreg_info *info = rdev_get_drvdata(rdev);
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int vsel;
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for (vsel = 0; vsel < info->table_len; vsel++) {
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int mV = info->table[vsel];
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int uV;
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if (IS_UNSUP(mV))
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continue;
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uV = LDO_MV(mV) * 1000;
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/* REVISIT for VAUX2, first match may not be best/lowest */
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/* use the first in-range value */
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if (min_uV <= uV && uV <= max_uV)
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return twl4030reg_write(info, VREG_DEDICATED, vsel);
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}
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return -EDOM;
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}
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static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
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{
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struct twlreg_info *info = rdev_get_drvdata(rdev);
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int vsel = twl4030reg_read(info, VREG_DEDICATED);
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if (vsel < 0)
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return vsel;
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vsel &= info->table_len - 1;
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return LDO_MV(info->table[vsel]) * 1000;
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}
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static struct regulator_ops twl4030ldo_ops = {
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.list_voltage = twl4030ldo_list_voltage,
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.set_voltage = twl4030ldo_set_voltage,
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.get_voltage = twl4030ldo_get_voltage,
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.enable = twl4030reg_enable,
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.disable = twl4030reg_disable,
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.is_enabled = twl4030reg_is_enabled,
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.set_mode = twl4030reg_set_mode,
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.get_status = twl4030reg_get_status,
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};
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/*----------------------------------------------------------------------*/
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/*
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* Fixed voltage LDOs don't have a VSEL field to update.
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*/
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static int twl4030fixed_list_voltage(struct regulator_dev *rdev, unsigned index)
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{
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struct twlreg_info *info = rdev_get_drvdata(rdev);
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return info->min_mV * 1000;
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}
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static int twl4030fixed_get_voltage(struct regulator_dev *rdev)
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{
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struct twlreg_info *info = rdev_get_drvdata(rdev);
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return info->min_mV * 1000;
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}
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static struct regulator_ops twl4030fixed_ops = {
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.list_voltage = twl4030fixed_list_voltage,
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.get_voltage = twl4030fixed_get_voltage,
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.enable = twl4030reg_enable,
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.disable = twl4030reg_disable,
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.is_enabled = twl4030reg_is_enabled,
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.set_mode = twl4030reg_set_mode,
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.get_status = twl4030reg_get_status,
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};
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/*----------------------------------------------------------------------*/
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#define TWL_ADJUSTABLE_LDO(label, offset, num) { \
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.base = offset, \
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.id = num, \
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.table_len = ARRAY_SIZE(label##_VSEL_table), \
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.table = label##_VSEL_table, \
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.desc = { \
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.name = #label, \
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.id = TWL4030_REG_##label, \
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.n_voltages = ARRAY_SIZE(label##_VSEL_table), \
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.ops = &twl4030ldo_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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}, \
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}
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#define TWL_FIXED_LDO(label, offset, mVolts, num) { \
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.base = offset, \
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.id = num, \
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.min_mV = mVolts, \
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.desc = { \
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.name = #label, \
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.id = TWL4030_REG_##label, \
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.n_voltages = 1, \
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.ops = &twl4030fixed_ops, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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}, \
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}
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/*
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* We list regulators here if systems need some level of
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* software control over them after boot.
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*/
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static struct twlreg_info twl4030_regs[] = {
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TWL_ADJUSTABLE_LDO(VAUX1, 0x17, 1),
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TWL_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2),
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TWL_ADJUSTABLE_LDO(VAUX2, 0x1b, 2),
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TWL_ADJUSTABLE_LDO(VAUX3, 0x1f, 3),
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TWL_ADJUSTABLE_LDO(VAUX4, 0x23, 4),
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TWL_ADJUSTABLE_LDO(VMMC1, 0x27, 5),
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TWL_ADJUSTABLE_LDO(VMMC2, 0x2b, 6),
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/*
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TWL_ADJUSTABLE_LDO(VPLL1, 0x2f, 7),
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*/
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TWL_ADJUSTABLE_LDO(VPLL2, 0x33, 8),
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TWL_ADJUSTABLE_LDO(VSIM, 0x37, 9),
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TWL_ADJUSTABLE_LDO(VDAC, 0x3b, 10),
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/*
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TWL_ADJUSTABLE_LDO(VINTANA1, 0x3f, 11),
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TWL_ADJUSTABLE_LDO(VINTANA2, 0x43, 12),
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TWL_ADJUSTABLE_LDO(VINTDIG, 0x47, 13),
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TWL_SMPS(VIO, 0x4b, 14),
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TWL_SMPS(VDD1, 0x55, 15),
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TWL_SMPS(VDD2, 0x63, 16),
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*/
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TWL_FIXED_LDO(VUSB1V5, 0x71, 1500, 17),
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TWL_FIXED_LDO(VUSB1V8, 0x74, 1800, 18),
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TWL_FIXED_LDO(VUSB3V1, 0x77, 3100, 19),
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/* VUSBCP is managed *only* by the USB subchip */
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};
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static int twl4030reg_probe(struct platform_device *pdev)
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{
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int i;
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struct twlreg_info *info;
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struct regulator_init_data *initdata;
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struct regulation_constraints *c;
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struct regulator_dev *rdev;
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for (i = 0, info = NULL; i < ARRAY_SIZE(twl4030_regs); i++) {
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if (twl4030_regs[i].desc.id != pdev->id)
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continue;
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info = twl4030_regs + i;
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break;
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}
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if (!info)
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return -ENODEV;
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initdata = pdev->dev.platform_data;
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if (!initdata)
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return -EINVAL;
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/* Constrain board-specific capabilities according to what
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* this driver and the chip itself can actually do.
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*/
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c = &initdata->constraints;
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c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
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c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
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| REGULATOR_CHANGE_MODE
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| REGULATOR_CHANGE_STATUS;
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rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev, "can't register %s, %ld\n",
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info->desc.name, PTR_ERR(rdev));
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return PTR_ERR(rdev);
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}
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platform_set_drvdata(pdev, rdev);
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/* NOTE: many regulators support short-circuit IRQs (presentable
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* as REGULATOR_OVER_CURRENT notifications?) configured via:
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* - SC_CONFIG
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* - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
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* - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
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* - IT_CONFIG
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*/
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return 0;
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}
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static int __devexit twl4030reg_remove(struct platform_device *pdev)
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{
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regulator_unregister(platform_get_drvdata(pdev));
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return 0;
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}
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MODULE_ALIAS("platform:twl4030_reg");
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static struct platform_driver twl4030reg_driver = {
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.probe = twl4030reg_probe,
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.remove = __devexit_p(twl4030reg_remove),
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/* NOTE: short name, to work around driver model truncation of
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* "twl4030_regulator.12" (and friends) to "twl4030_regulator.1".
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*/
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.driver.name = "twl4030_reg",
|
|
.driver.owner = THIS_MODULE,
|
|
};
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|
|
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static int __init twl4030reg_init(void)
|
|
{
|
|
return platform_driver_register(&twl4030reg_driver);
|
|
}
|
|
subsys_initcall(twl4030reg_init);
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|
|
|
static void __exit twl4030reg_exit(void)
|
|
{
|
|
platform_driver_unregister(&twl4030reg_driver);
|
|
}
|
|
module_exit(twl4030reg_exit)
|
|
|
|
MODULE_DESCRIPTION("TWL4030 regulator driver");
|
|
MODULE_LICENSE("GPL");
|