u-boot/drivers/power/twl4030.c
Paul Kocialkowski 6dc443e6d7 power: twl4030: Power off support
This adds support for powering off (the omap3 SoC) from the twl4030. This is
especially useful when the kernel does not actually power off the device using
this method but reboots and leaves it up to the bootloader to actually turn the
power off.
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
2015-08-12 20:47:35 -04:00

173 lines
4.8 KiB
C

/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix at windriver.com>
*
* SPDX-License-Identifier: GPL-2.0+
*
* twl4030_power_reset_init is derived from code on omapzoom,
* git://git.omapzoom.com/repo/u-boot.git
*
* Copyright (C) 2007-2009 Texas Instruments, Inc.
*
* twl4030_power_init is from cpu/omap3/common.c, power_init_r
*
* (C) Copyright 2004-2008
* Texas Instruments, <www.ti.com>
*
* Author :
* Sunil Kumar <sunilsaini05 at gmail.com>
* Shashi Ranjan <shashiranjanmca05 at gmail.com>
*
* Derived from Beagle Board and 3430 SDP code by
* Richard Woodruff <r-woodruff2 at ti.com>
* Syed Mohammed Khasim <khasim at ti.com>
*/
#include <twl4030.h>
/*
* Power Reset
*/
void twl4030_power_reset_init(void)
{
u8 val = 0;
if (twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_P1_SW_EVENTS, &val)) {
printf("Error:TWL4030: failed to read the power register\n");
printf("Could not initialize hardware reset\n");
} else {
val |= TWL4030_PM_MASTER_SW_EVENTS_STOPON_PWRON;
if (twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_P1_SW_EVENTS, val)) {
printf("Error:TWL4030: failed to write the power register\n");
printf("Could not initialize hardware reset\n");
}
}
}
/*
* Power off
*/
void twl4030_power_off(void)
{
u8 data;
/* PM master unlock (CFG and TST keys) */
data = 0xCE;
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_PROTECT_KEY, data);
data = 0xEC;
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_PROTECT_KEY, data);
/* VBAT start disable */
twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_CFG_P1_TRANSITION, &data);
data &= ~TWL4030_PM_MASTER_CFG_TRANSITION_STARTON_VBAT;
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_CFG_P1_TRANSITION, data);
twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_CFG_P2_TRANSITION, &data);
data &= ~TWL4030_PM_MASTER_CFG_TRANSITION_STARTON_VBAT;
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_CFG_P2_TRANSITION, data);
twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_CFG_P3_TRANSITION, &data);
data &= ~TWL4030_PM_MASTER_CFG_TRANSITION_STARTON_VBAT;
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_CFG_P3_TRANSITION, data);
/* High jitter for PWRANA2 */
twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_CFG_PWRANA2, &data);
data &= ~(TWL4030_PM_MASTER_CFG_PWRANA2_LOJIT0_LOWV |
TWL4030_PM_MASTER_CFG_PWRANA2_LOJIT1_LOWV);
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_CFG_PWRANA2, data);
/* PM master lock */
data = 0xFF;
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_PROTECT_KEY, data);
/* Power off */
twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_P1_SW_EVENTS, &data);
data |= TWL4030_PM_MASTER_SW_EVENTS_DEVOFF;
twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER,
TWL4030_PM_MASTER_P1_SW_EVENTS, data);
}
/*
* Set Device Group and Voltage
*/
void twl4030_pmrecv_vsel_cfg(u8 vsel_reg, u8 vsel_val,
u8 dev_grp, u8 dev_grp_sel)
{
int ret;
/* Select the Voltage */
ret = twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, vsel_reg,
vsel_val);
if (ret != 0) {
printf("Could not write vsel to reg %02x (%d)\n",
vsel_reg, ret);
return;
}
/* Select the Device Group (enable the supply if dev_grp_sel != 0) */
ret = twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, dev_grp,
dev_grp_sel);
if (ret != 0)
printf("Could not write grp_sel to reg %02x (%d)\n",
dev_grp, ret);
}
void twl4030_power_init(void)
{
/* set VAUX3 to 2.8V */
twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX3_DEDICATED,
TWL4030_PM_RECEIVER_VAUX3_VSEL_28,
TWL4030_PM_RECEIVER_VAUX3_DEV_GRP,
TWL4030_PM_RECEIVER_DEV_GRP_P1);
/* set VPLL2 to 1.8V */
twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VPLL2_DEDICATED,
TWL4030_PM_RECEIVER_VPLL2_VSEL_18,
TWL4030_PM_RECEIVER_VPLL2_DEV_GRP,
TWL4030_PM_RECEIVER_DEV_GRP_ALL);
/* set VDAC to 1.8V */
twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VDAC_DEDICATED,
TWL4030_PM_RECEIVER_VDAC_VSEL_18,
TWL4030_PM_RECEIVER_VDAC_DEV_GRP,
TWL4030_PM_RECEIVER_DEV_GRP_P1);
}
void twl4030_power_mmc_init(int dev_index)
{
if (dev_index == 0) {
/* Set VMMC1 to 3.15 Volts */
twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC1_DEDICATED,
TWL4030_PM_RECEIVER_VMMC1_VSEL_32,
TWL4030_PM_RECEIVER_VMMC1_DEV_GRP,
TWL4030_PM_RECEIVER_DEV_GRP_P1);
mdelay(100); /* ramp-up delay from Linux code */
} else if (dev_index == 1) {
/* Set VMMC2 to 3.15 Volts */
twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC2_DEDICATED,
TWL4030_PM_RECEIVER_VMMC2_VSEL_32,
TWL4030_PM_RECEIVER_VMMC2_DEV_GRP,
TWL4030_PM_RECEIVER_DEV_GRP_P1);
mdelay(100); /* ramp-up delay from Linux code */
}
}