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MMC interfaces are specified to be 3.3V compatible with an operating voltage range of 3.1V to 3.5V for SD cards. This change affects hardware using TWL4030 (TPS6595x) PMICs and should improve the reliability when communicating with marginally-spec'd MMC devices. 3.15V is the highest possible level for this chip. This patch has been tested on a Gumstix Overo board. Signed-off-by: Ash Charles <ash@gumstix.com> Tested-by: Steve Sakoman <steve@sakoman.com>
106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*
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* Copyright (c) 2009 Wind River Systems, Inc.
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* Tom Rix <Tom.Rix at windriver.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* twl4030_power_reset_init is derived from code on omapzoom,
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* git://git.omapzoom.com/repo/u-boot.git
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*
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* Copyright (C) 2007-2009 Texas Instruments, Inc.
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*
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* twl4030_power_init is from cpu/omap3/common.c, power_init_r
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*
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* (C) Copyright 2004-2008
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* Texas Instruments, <www.ti.com>
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*
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* Author :
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* Sunil Kumar <sunilsaini05 at gmail.com>
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* Shashi Ranjan <shashiranjanmca05 at gmail.com>
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*
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* Derived from Beagle Board and 3430 SDP code by
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* Richard Woodruff <r-woodruff2 at ti.com>
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* Syed Mohammed Khasim <khasim at ti.com>
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*
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*/
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#include <twl4030.h>
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/*
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* Power Reset
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*/
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void twl4030_power_reset_init(void)
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{
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u8 val = 0;
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if (twl4030_i2c_read_u8(TWL4030_CHIP_PM_MASTER, &val,
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TWL4030_PM_MASTER_P1_SW_EVENTS)) {
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printf("Error:TWL4030: failed to read the power register\n");
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printf("Could not initialize hardware reset\n");
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} else {
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val |= TWL4030_PM_MASTER_SW_EVENTS_STOPON_PWRON;
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if (twl4030_i2c_write_u8(TWL4030_CHIP_PM_MASTER, val,
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TWL4030_PM_MASTER_P1_SW_EVENTS)) {
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printf("Error:TWL4030: failed to write the power register\n");
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printf("Could not initialize hardware reset\n");
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}
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}
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}
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/*
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* Set Device Group and Voltage
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*/
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void twl4030_pmrecv_vsel_cfg(u8 vsel_reg, u8 vsel_val,
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u8 dev_grp, u8 dev_grp_sel)
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{
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/* Select the Device Group */
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twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, dev_grp_sel,
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dev_grp);
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/* Select the Voltage */
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twl4030_i2c_write_u8(TWL4030_CHIP_PM_RECEIVER, vsel_val,
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vsel_reg);
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}
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void twl4030_power_init(void)
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{
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/* set VAUX3 to 2.8V */
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twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX3_DEDICATED,
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TWL4030_PM_RECEIVER_VAUX3_VSEL_28,
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TWL4030_PM_RECEIVER_VAUX3_DEV_GRP,
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TWL4030_PM_RECEIVER_DEV_GRP_P1);
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/* set VPLL2 to 1.8V */
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twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VPLL2_DEDICATED,
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TWL4030_PM_RECEIVER_VPLL2_VSEL_18,
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TWL4030_PM_RECEIVER_VPLL2_DEV_GRP,
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TWL4030_PM_RECEIVER_DEV_GRP_ALL);
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/* set VDAC to 1.8V */
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twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VDAC_DEDICATED,
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TWL4030_PM_RECEIVER_VDAC_VSEL_18,
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TWL4030_PM_RECEIVER_VDAC_DEV_GRP,
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TWL4030_PM_RECEIVER_DEV_GRP_P1);
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}
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void twl4030_power_mmc_init(void)
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{
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/* Set VMMC1 to 3.15 Volts */
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twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VMMC1_DEDICATED,
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TWL4030_PM_RECEIVER_VMMC1_VSEL_32,
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TWL4030_PM_RECEIVER_VMMC1_DEV_GRP,
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TWL4030_PM_RECEIVER_DEV_GRP_P1);
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}
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