2008-12-10 18:37:17 -07:00
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/*
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* linux/arch/arm/mach-omap2/mmc-twl4030.c
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*
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* Copyright (C) 2007-2008 Texas Instruments
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* Copyright (C) 2008 Nokia Corporation
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* Author: Texas Instruments
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/i2c/twl4030.h>
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2009-03-23 19:23:47 -06:00
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#include <linux/regulator/machine.h>
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2008-12-10 18:37:17 -07:00
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#include <mach/hardware.h>
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#include <mach/control.h>
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#include <mach/mmc.h>
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#include <mach/board.h>
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#include "mmc-twl4030.h"
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#if defined(CONFIG_TWL4030_CORE) && \
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(defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))
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#define LDO_CLR 0x00
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#define VSEL_S2_CLR 0x40
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#define VMMC1_DEV_GRP 0x27
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#define VMMC1_CLR 0x00
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#define VMMC1_315V 0x03
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#define VMMC1_300V 0x02
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#define VMMC1_285V 0x01
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#define VMMC1_185V 0x00
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#define VMMC1_DEDICATED 0x2A
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#define VMMC2_DEV_GRP 0x2B
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#define VMMC2_CLR 0x40
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#define VMMC2_315V 0x0c
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#define VMMC2_300V 0x0b
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#define VMMC2_285V 0x0a
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2009-03-23 19:23:47 -06:00
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#define VMMC2_280V 0x09
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2008-12-10 18:37:17 -07:00
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#define VMMC2_260V 0x08
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#define VMMC2_185V 0x06
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#define VMMC2_DEDICATED 0x2E
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#define VMMC_DEV_GRP_P1 0x20
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static u16 control_pbias_offset;
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static u16 control_devconf1_offset;
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#define HSMMC_NAME_LEN 9
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static struct twl_mmc_controller {
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struct omap_mmc_platform_data *mmc;
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u8 twl_vmmc_dev_grp;
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u8 twl_mmc_dedicated;
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2009-03-23 19:23:46 -06:00
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char name[HSMMC_NAME_LEN + 1];
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2008-12-10 18:37:17 -07:00
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} hsmmc[] = {
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{
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.twl_vmmc_dev_grp = VMMC1_DEV_GRP,
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.twl_mmc_dedicated = VMMC1_DEDICATED,
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},
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{
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.twl_vmmc_dev_grp = VMMC2_DEV_GRP,
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.twl_mmc_dedicated = VMMC2_DEDICATED,
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},
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};
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static int twl_mmc_card_detect(int irq)
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{
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unsigned i;
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for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
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struct omap_mmc_platform_data *mmc;
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mmc = hsmmc[i].mmc;
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if (!mmc)
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continue;
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if (irq != mmc->slots[0].card_detect_irq)
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continue;
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/* NOTE: assumes card detect signal is active-low */
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return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
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}
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return -ENOSYS;
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}
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static int twl_mmc_get_ro(struct device *dev, int slot)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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/* NOTE: assumes write protect signal is active-high */
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return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
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}
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/*
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* MMC Slot Initialization.
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*/
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static int twl_mmc_late_init(struct device *dev)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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int ret = 0;
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int i;
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ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
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if (ret)
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goto done;
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ret = gpio_direction_input(mmc->slots[0].switch_pin);
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if (ret)
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goto err;
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for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
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if (hsmmc[i].name == mmc->slots[0].name) {
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hsmmc[i].mmc = mmc;
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break;
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}
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}
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return 0;
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err:
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gpio_free(mmc->slots[0].switch_pin);
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done:
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mmc->slots[0].card_detect_irq = 0;
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mmc->slots[0].card_detect = NULL;
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dev_err(dev, "err %d configuring card detect\n", ret);
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return ret;
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}
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static void twl_mmc_cleanup(struct device *dev)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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gpio_free(mmc->slots[0].switch_pin);
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}
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#ifdef CONFIG_PM
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static int twl_mmc_suspend(struct device *dev, int slot)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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disable_irq(mmc->slots[0].card_detect_irq);
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return 0;
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}
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static int twl_mmc_resume(struct device *dev, int slot)
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{
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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enable_irq(mmc->slots[0].card_detect_irq);
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return 0;
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}
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#else
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#define twl_mmc_suspend NULL
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#define twl_mmc_resume NULL
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#endif
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/*
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* Sets the MMC voltage in twl4030
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*/
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2009-03-23 19:23:47 -06:00
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#define MMC1_OCR (MMC_VDD_165_195 \
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|MMC_VDD_28_29|MMC_VDD_29_30|MMC_VDD_30_31|MMC_VDD_31_32)
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#define MMC2_OCR (MMC_VDD_165_195 \
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|MMC_VDD_25_26|MMC_VDD_26_27|MMC_VDD_27_28 \
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|MMC_VDD_28_29|MMC_VDD_29_30|MMC_VDD_30_31|MMC_VDD_31_32)
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2008-12-10 18:37:17 -07:00
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static int twl_mmc_set_voltage(struct twl_mmc_controller *c, int vdd)
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{
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int ret;
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u8 vmmc, dev_grp_val;
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2009-03-23 19:23:47 -06:00
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if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP) {
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/* VMMC1: max 220 mA. And for 8-bit mode,
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* VSIM: max 50 mA
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*/
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switch (1 << vdd) {
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case MMC_VDD_165_195:
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2008-12-10 18:37:17 -07:00
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vmmc = VMMC1_185V;
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2009-03-23 19:23:47 -06:00
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/* and VSIM_180V */
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break;
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case MMC_VDD_28_29:
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vmmc = VMMC1_285V;
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/* and VSIM_280V */
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break;
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case MMC_VDD_29_30:
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case MMC_VDD_30_31:
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vmmc = VMMC1_300V;
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/* and VSIM_300V */
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break;
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case MMC_VDD_31_32:
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vmmc = VMMC1_315V;
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/* error if VSIM needed */
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break;
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default:
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vmmc = 0;
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break;
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}
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} else if (c->twl_vmmc_dev_grp == VMMC2_DEV_GRP) {
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/* VMMC2: max 100 mA */
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switch (1 << vdd) {
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case MMC_VDD_165_195:
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2008-12-10 18:37:17 -07:00
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vmmc = VMMC2_185V;
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2009-03-23 19:23:47 -06:00
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break;
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case MMC_VDD_25_26:
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case MMC_VDD_26_27:
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vmmc = VMMC2_260V;
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break;
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case MMC_VDD_27_28:
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vmmc = VMMC2_280V;
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break;
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case MMC_VDD_28_29:
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vmmc = VMMC2_285V;
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break;
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case MMC_VDD_29_30:
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case MMC_VDD_30_31:
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vmmc = VMMC2_300V;
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break;
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case MMC_VDD_31_32:
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vmmc = VMMC2_315V;
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break;
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default:
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vmmc = 0;
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break;
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}
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} else {
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return 0;
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2008-12-10 18:37:17 -07:00
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}
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if (vmmc)
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dev_grp_val = VMMC_DEV_GRP_P1; /* Power up */
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else
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dev_grp_val = LDO_CLR; /* Power down */
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ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
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dev_grp_val, c->twl_vmmc_dev_grp);
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if (ret)
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return ret;
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ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
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vmmc, c->twl_mmc_dedicated);
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return ret;
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}
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static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
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int vdd)
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{
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u32 reg;
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int ret = 0;
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struct twl_mmc_controller *c = &hsmmc[0];
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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2009-03-23 19:23:47 -06:00
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/*
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* Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
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* card using the same TWL VMMC1 supply (hsmmc[0]); OMAP has both
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* 1.8V and 3.0V modes, controlled by the PBIAS register.
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*
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* In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
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* is most naturally TWL VSIM; those pins also use PBIAS.
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*/
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2008-12-10 18:37:17 -07:00
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if (power_on) {
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if (cpu_is_omap2430()) {
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reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
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if ((1 << vdd) >= MMC_VDD_30_31)
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reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
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else
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reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
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omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
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}
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if (mmc->slots[0].internal_clock) {
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reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
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reg |= OMAP2_MMCSDIO1ADPCLKISEL;
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omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
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}
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reg = omap_ctrl_readl(control_pbias_offset);
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reg |= OMAP2_PBIASSPEEDCTRL0;
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reg &= ~OMAP2_PBIASLITEPWRDNZ0;
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omap_ctrl_writel(reg, control_pbias_offset);
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ret = twl_mmc_set_voltage(c, vdd);
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/* 100ms delay required for PBIAS configuration */
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msleep(100);
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reg = omap_ctrl_readl(control_pbias_offset);
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reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
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if ((1 << vdd) <= MMC_VDD_165_195)
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reg &= ~OMAP2_PBIASLITEVMODE0;
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else
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reg |= OMAP2_PBIASLITEVMODE0;
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omap_ctrl_writel(reg, control_pbias_offset);
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} else {
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reg = omap_ctrl_readl(control_pbias_offset);
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reg &= ~OMAP2_PBIASLITEPWRDNZ0;
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omap_ctrl_writel(reg, control_pbias_offset);
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ret = twl_mmc_set_voltage(c, 0);
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/* 100ms delay required for PBIAS configuration */
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msleep(100);
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reg = omap_ctrl_readl(control_pbias_offset);
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reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
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OMAP2_PBIASLITEVMODE0);
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omap_ctrl_writel(reg, control_pbias_offset);
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}
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return ret;
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}
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static int twl_mmc2_set_power(struct device *dev, int slot, int power_on, int vdd)
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{
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int ret;
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struct twl_mmc_controller *c = &hsmmc[1];
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struct omap_mmc_platform_data *mmc = dev->platform_data;
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2009-03-23 19:23:47 -06:00
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/*
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* Assume TWL VMMC2 (hsmmc[1]) is used only to power the card ... OMAP
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* VDDS is used to power the pins, optionally with a transceiver to
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* support cards using voltages other than VDDS (1.8V nominal). When a
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* transceiver is used, DAT3..7 are muxed as transceiver control pins.
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*/
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2008-12-10 18:37:17 -07:00
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if (power_on) {
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if (mmc->slots[0].internal_clock) {
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u32 reg;
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reg = omap_ctrl_readl(control_devconf1_offset);
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reg |= OMAP2_MMCSDIO2ADPCLKISEL;
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omap_ctrl_writel(reg, control_devconf1_offset);
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}
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ret = twl_mmc_set_voltage(c, vdd);
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} else {
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ret = twl_mmc_set_voltage(c, 0);
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}
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return ret;
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}
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static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;
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void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
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{
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struct twl4030_hsmmc_info *c;
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int nr_hsmmc = ARRAY_SIZE(hsmmc_data);
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if (cpu_is_omap2430()) {
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control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
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control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
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nr_hsmmc = 2;
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} else {
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control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
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control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
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}
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for (c = controllers; c->mmc; c++) {
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struct twl_mmc_controller *twl = hsmmc + c->mmc - 1;
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struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
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if (!c->mmc || c->mmc > nr_hsmmc) {
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pr_debug("MMC%d: no such controller\n", c->mmc);
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continue;
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}
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if (mmc) {
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pr_debug("MMC%d: already configured\n", c->mmc);
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continue;
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}
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mmc = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
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if (!mmc) {
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pr_err("Cannot allocate memory for mmc device!\n");
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return;
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}
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2009-03-23 19:23:46 -06:00
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snprintf(twl->name, ARRAY_SIZE(twl->name), "mmc%islot%i",
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c->mmc, 1);
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2008-12-10 18:37:17 -07:00
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mmc->slots[0].name = twl->name;
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mmc->nr_slots = 1;
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mmc->slots[0].wires = c->wires;
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mmc->slots[0].internal_clock = !c->ext_clock;
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mmc->dma_mask = 0xffffffff;
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/* note: twl4030 card detect GPIOs normally switch VMMCx ... */
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if (gpio_is_valid(c->gpio_cd)) {
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mmc->init = twl_mmc_late_init;
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mmc->cleanup = twl_mmc_cleanup;
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mmc->suspend = twl_mmc_suspend;
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mmc->resume = twl_mmc_resume;
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mmc->slots[0].switch_pin = c->gpio_cd;
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mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
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mmc->slots[0].card_detect = twl_mmc_card_detect;
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} else
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mmc->slots[0].switch_pin = -EINVAL;
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/* write protect normally uses an OMAP gpio */
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if (gpio_is_valid(c->gpio_wp)) {
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gpio_request(c->gpio_wp, "mmc_wp");
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gpio_direction_input(c->gpio_wp);
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mmc->slots[0].gpio_wp = c->gpio_wp;
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mmc->slots[0].get_ro = twl_mmc_get_ro;
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} else
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mmc->slots[0].gpio_wp = -EINVAL;
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/* NOTE: we assume OMAP's MMC1 and MMC2 use
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* the TWL4030's VMMC1 and VMMC2, respectively;
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* and that OMAP's MMC3 isn't used.
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*/
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switch (c->mmc) {
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case 1:
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mmc->slots[0].set_power = twl_mmc1_set_power;
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2009-03-23 19:23:47 -06:00
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mmc->slots[0].ocr_mask = MMC1_OCR;
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2008-12-10 18:37:17 -07:00
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break;
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case 2:
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mmc->slots[0].set_power = twl_mmc2_set_power;
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2009-03-23 19:23:47 -06:00
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if (c->transceiver)
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mmc->slots[0].ocr_mask = MMC2_OCR;
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else
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mmc->slots[0].ocr_mask = MMC_VDD_165_195;
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2008-12-10 18:37:17 -07:00
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break;
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default:
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pr_err("MMC%d configuration not supported!\n", c->mmc);
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continue;
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}
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hsmmc_data[c->mmc - 1] = mmc;
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}
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omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);
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2009-03-23 19:23:47 -06:00
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/* pass the device nodes back to board setup code */
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for (c = controllers; c->mmc; c++) {
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struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
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if (!c->mmc || c->mmc > nr_hsmmc)
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continue;
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c->dev = mmc->dev;
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}
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2008-12-10 18:37:17 -07:00
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}
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#endif
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