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* linux/arch/arm/mach-omap2/mmc-twl4030.c
*
* Copyright (C) 2007-2008 Texas Instruments
* Copyright (C) 2008 Nokia Corporation
* Author: Texas Instruments
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/mmc/host.h>
#include <linux/regulator/consumer.h>
#include <mach/hardware.h>
#include <mach/control.h>
#include <mach/mmc.h>
#include <mach/board.h>
#include "mmc-twl4030.h"
#if defined(CONFIG_REGULATOR) && \
(defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))
static u16 control_pbias_offset;
static u16 control_devconf1_offset;
#define HSMMC_NAME_LEN 9
static struct twl_mmc_controller {
struct omap_mmc_platform_data *mmc;
/* Vcc == configured supply
* Vcc_alt == optional
* - MMC1, supply for DAT4..DAT7
* - MMC2/MMC2, external level shifter voltage supply, for
* chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
*/
struct regulator *vcc;
struct regulator *vcc_aux;
char name[HSMMC_NAME_LEN + 1];
} hsmmc[OMAP34XX_NR_MMC];
static int twl_mmc_card_detect(int irq)
{
unsigned i;
for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
struct omap_mmc_platform_data *mmc;
mmc = hsmmc[i].mmc;
if (!mmc)
continue;
if (irq != mmc->slots[0].card_detect_irq)
continue;
/* NOTE: assumes card detect signal is active-low */
return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
}
return -ENOSYS;
}
static int twl_mmc_get_ro(struct device *dev, int slot)
{
struct omap_mmc_platform_data *mmc = dev->platform_data;
/* NOTE: assumes write protect signal is active-high */
return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
}
static int twl_mmc_get_cover_state(struct device *dev, int slot)
{
struct omap_mmc_platform_data *mmc = dev->platform_data;
/* NOTE: assumes card detect signal is active-low */
return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
}
/*
* MMC Slot Initialization.
*/
static int twl_mmc_late_init(struct device *dev)
{
struct omap_mmc_platform_data *mmc = dev->platform_data;
int ret = 0;
int i;
/* MMC/SD/SDIO doesn't require a card detect switch */
if (gpio_is_valid(mmc->slots[0].switch_pin)) {
ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
if (ret)
goto done;
ret = gpio_direction_input(mmc->slots[0].switch_pin);
if (ret)
goto err;
}
/* require at least main regulator */
for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
if (hsmmc[i].name == mmc->slots[0].name) {
struct regulator *reg;
hsmmc[i].mmc = mmc;
reg = regulator_get(dev, "vmmc");
if (IS_ERR(reg)) {
dev_dbg(dev, "vmmc regulator missing\n");
/* HACK: until fixed.c regulator is usable,
* we don't require a main regulator
* for MMC2 or MMC3
*/
if (i != 0)
break;
ret = PTR_ERR(reg);
hsmmc[i].vcc = NULL;
goto err;
}
hsmmc[i].vcc = reg;
mmc->slots[0].ocr_mask = mmc_regulator_get_ocrmask(reg);
/* allow an aux regulator */
reg = regulator_get(dev, "vmmc_aux");
hsmmc[i].vcc_aux = IS_ERR(reg) ? NULL : reg;
/* UGLY HACK: workaround regulator framework bugs.
* When the bootloader leaves a supply active, it's
* initialized with zero usecount ... and we can't
* disable it without first enabling it. Until the
* framework is fixed, we need a workaround like this
* (which is safe for MMC, but not in general).
*/
if (regulator_is_enabled(hsmmc[i].vcc) > 0) {
regulator_enable(hsmmc[i].vcc);
regulator_disable(hsmmc[i].vcc);
}
if (hsmmc[i].vcc_aux) {
if (regulator_is_enabled(reg) > 0) {
regulator_enable(reg);
regulator_disable(reg);
}
}
break;
}
}
return 0;
err:
gpio_free(mmc->slots[0].switch_pin);
done:
mmc->slots[0].card_detect_irq = 0;
mmc->slots[0].card_detect = NULL;
dev_err(dev, "err %d configuring card detect\n", ret);
return ret;
}
static void twl_mmc_cleanup(struct device *dev)
{
struct omap_mmc_platform_data *mmc = dev->platform_data;
int i;
gpio_free(mmc->slots[0].switch_pin);
for(i = 0; i < ARRAY_SIZE(hsmmc); i++) {
regulator_put(hsmmc[i].vcc);
regulator_put(hsmmc[i].vcc_aux);
}
}
#ifdef CONFIG_PM
static int twl_mmc_suspend(struct device *dev, int slot)
{
struct omap_mmc_platform_data *mmc = dev->platform_data;
disable_irq(mmc->slots[0].card_detect_irq);
return 0;
}
static int twl_mmc_resume(struct device *dev, int slot)
{
struct omap_mmc_platform_data *mmc = dev->platform_data;
enable_irq(mmc->slots[0].card_detect_irq);
return 0;
}
#else
#define twl_mmc_suspend NULL
#define twl_mmc_resume NULL
#endif
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
static int twl4030_mmc_get_context_loss(struct device *dev)
{
/* FIXME: PM DPS not implemented yet */
return 0;
}
#else
#define twl4030_mmc_get_context_loss NULL
#endif
static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
int vdd)
{
u32 reg;
int ret = 0;
struct twl_mmc_controller *c = &hsmmc[0];
struct omap_mmc_platform_data *mmc = dev->platform_data;
/*
* Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
* card with Vcc regulator (from twl4030 or whatever). OMAP has both
* 1.8V and 3.0V modes, controlled by the PBIAS register.
*
* In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
* is most naturally TWL VSIM; those pins also use PBIAS.
*
* FIXME handle VMMC1A as needed ...
*/
if (power_on) {
if (cpu_is_omap2430()) {
reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
if ((1 << vdd) >= MMC_VDD_30_31)
reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
else
reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
}
if (mmc->slots[0].internal_clock) {
reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
reg |= OMAP2_MMCSDIO1ADPCLKISEL;
omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
}
reg = omap_ctrl_readl(control_pbias_offset);
reg |= OMAP2_PBIASSPEEDCTRL0;
reg &= ~OMAP2_PBIASLITEPWRDNZ0;
omap_ctrl_writel(reg, control_pbias_offset);
ret = mmc_regulator_set_ocr(c->vcc, vdd);
/* 100ms delay required for PBIAS configuration */
msleep(100);
reg = omap_ctrl_readl(control_pbias_offset);
reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
if ((1 << vdd) <= MMC_VDD_165_195)
reg &= ~OMAP2_PBIASLITEVMODE0;
else
reg |= OMAP2_PBIASLITEVMODE0;
omap_ctrl_writel(reg, control_pbias_offset);
} else {
reg = omap_ctrl_readl(control_pbias_offset);
reg &= ~OMAP2_PBIASLITEPWRDNZ0;
omap_ctrl_writel(reg, control_pbias_offset);
ret = mmc_regulator_set_ocr(c->vcc, 0);
/* 100ms delay required for PBIAS configuration */
msleep(100);
reg = omap_ctrl_readl(control_pbias_offset);
reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
OMAP2_PBIASLITEVMODE0);
omap_ctrl_writel(reg, control_pbias_offset);
}
return ret;
}
static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int vdd)
{
int ret = 0;
struct twl_mmc_controller *c = NULL;
struct omap_mmc_platform_data *mmc = dev->platform_data;
int i;
for (i = 1; i < ARRAY_SIZE(hsmmc); i++) {
if (mmc == hsmmc[i].mmc) {
c = &hsmmc[i];
break;
}
}
if (c == NULL)
return -ENODEV;
/* If we don't see a Vcc regulator, assume it's a fixed
* voltage always-on regulator.
*/
if (!c->vcc)
return 0;
/*
* Assume Vcc regulator is used only to power the card ... OMAP
* VDDS is used to power the pins, optionally with a transceiver to
* support cards using voltages other than VDDS (1.8V nominal). When a
* transceiver is used, DAT3..7 are muxed as transceiver control pins.
*
* In some cases this regulator won't support enable/disable;
* e.g. it's a fixed rail for a WLAN chip.
*
* In other cases vcc_aux switches interface power. Example, for
* eMMC cards it represents VccQ. Sometimes transceivers or SDIO
* chips/cards need an interface voltage rail too.
*/
if (power_on) {
/* only MMC2 supports a CLKIN */
if (mmc->slots[0].internal_clock) {
u32 reg;
reg = omap_ctrl_readl(control_devconf1_offset);
reg |= OMAP2_MMCSDIO2ADPCLKISEL;
omap_ctrl_writel(reg, control_devconf1_offset);
}
ret = mmc_regulator_set_ocr(c->vcc, vdd);
/* enable interface voltage rail, if needed */
if (ret == 0 && c->vcc_aux) {
ret = regulator_enable(c->vcc_aux);
if (ret < 0)
ret = mmc_regulator_set_ocr(c->vcc, 0);
}
} else {
if (c->vcc_aux && (ret = regulator_is_enabled(c->vcc_aux)) > 0)
ret = regulator_disable(c->vcc_aux);
if (ret == 0)
ret = mmc_regulator_set_ocr(c->vcc, 0);
}
return ret;
}
static int twl_mmc1_set_sleep(struct device *dev, int slot, int sleep, int vdd,
int cardsleep)
{
struct twl_mmc_controller *c = &hsmmc[0];
int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
return regulator_set_mode(c->vcc, mode);
}
static int twl_mmc23_set_sleep(struct device *dev, int slot, int sleep, int vdd,
int cardsleep)
{
struct twl_mmc_controller *c = NULL;
struct omap_mmc_platform_data *mmc = dev->platform_data;
int i, err, mode;
for (i = 1; i < ARRAY_SIZE(hsmmc); i++) {
if (mmc == hsmmc[i].mmc) {
c = &hsmmc[i];
break;
}
}
if (c == NULL)
return -ENODEV;
/*
* If we don't see a Vcc regulator, assume it's a fixed
* voltage always-on regulator.
*/
if (!c->vcc)
return 0;
mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
if (!c->vcc_aux)
return regulator_set_mode(c->vcc, mode);
if (cardsleep) {
/* VCC can be turned off if card is asleep */
struct regulator *vcc_aux = c->vcc_aux;
c->vcc_aux = NULL;
if (sleep)
err = twl_mmc23_set_power(dev, slot, 0, 0);
else
err = twl_mmc23_set_power(dev, slot, 1, vdd);
c->vcc_aux = vcc_aux;
} else
err = regulator_set_mode(c->vcc, mode);
if (err)
return err;
return regulator_set_mode(c->vcc_aux, mode);
}
static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;
void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
{
struct twl4030_hsmmc_info *c;
int nr_hsmmc = ARRAY_SIZE(hsmmc_data);
if (cpu_is_omap2430()) {
control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
nr_hsmmc = 2;
} else {
control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
}
for (c = controllers; c->mmc; c++) {
struct twl_mmc_controller *twl = hsmmc + c->mmc - 1;
struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
if (!c->mmc || c->mmc > nr_hsmmc) {
pr_debug("MMC%d: no such controller\n", c->mmc);
continue;
}
if (mmc) {
pr_debug("MMC%d: already configured\n", c->mmc);
continue;
}
mmc = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
if (!mmc) {
pr_err("Cannot allocate memory for mmc device!\n");
return;
}
if (c->name)
strncpy(twl->name, c->name, HSMMC_NAME_LEN);
else
snprintf(twl->name, ARRAY_SIZE(twl->name),
"mmc%islot%i", c->mmc, 1);
mmc->slots[0].name = twl->name;
mmc->nr_slots = 1;
mmc->slots[0].wires = c->wires;
mmc->slots[0].internal_clock = !c->ext_clock;
mmc->dma_mask = 0xffffffff;
mmc->init = twl_mmc_late_init;
/* note: twl4030 card detect GPIOs can disable VMMCx ... */
if (gpio_is_valid(c->gpio_cd)) {
mmc->cleanup = twl_mmc_cleanup;
mmc->suspend = twl_mmc_suspend;
mmc->resume = twl_mmc_resume;
mmc->slots[0].switch_pin = c->gpio_cd;
mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
if (c->cover_only)
mmc->slots[0].get_cover_state = twl_mmc_get_cover_state;
else
mmc->slots[0].card_detect = twl_mmc_card_detect;
} else
mmc->slots[0].switch_pin = -EINVAL;
mmc->get_context_loss_count =
twl4030_mmc_get_context_loss;
/* write protect normally uses an OMAP gpio */
if (gpio_is_valid(c->gpio_wp)) {
gpio_request(c->gpio_wp, "mmc_wp");
gpio_direction_input(c->gpio_wp);
mmc->slots[0].gpio_wp = c->gpio_wp;
mmc->slots[0].get_ro = twl_mmc_get_ro;
} else
mmc->slots[0].gpio_wp = -EINVAL;
if (c->nonremovable)
mmc->slots[0].nonremovable = 1;
if (c->power_saving)
mmc->slots[0].power_saving = 1;
/* NOTE: MMC slots should have a Vcc regulator set up.
* This may be from a TWL4030-family chip, another
* controllable regulator, or a fixed supply.
*
* temporary HACK: ocr_mask instead of fixed supply
*/
mmc->slots[0].ocr_mask = c->ocr_mask;
switch (c->mmc) {
case 1:
/* on-chip level shifting via PBIAS0/PBIAS1 */
mmc->slots[0].set_power = twl_mmc1_set_power;
mmc->slots[0].set_sleep = twl_mmc1_set_sleep;
break;
case 2:
if (c->ext_clock)
c->transceiver = 1;
if (c->transceiver && c->wires > 4)
c->wires = 4;
/* FALLTHROUGH */
case 3:
/* off-chip level shifting, or none */
mmc->slots[0].set_power = twl_mmc23_set_power;
mmc->slots[0].set_sleep = twl_mmc23_set_sleep;
break;
default:
pr_err("MMC%d configuration not supported!\n", c->mmc);
kfree(mmc);
continue;
}
hsmmc_data[c->mmc - 1] = mmc;
}
omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);
/* pass the device nodes back to board setup code */
for (c = controllers; c->mmc; c++) {
struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];
if (!c->mmc || c->mmc > nr_hsmmc)
continue;
c->dev = mmc->dev;
}
}
#endif
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