/*
* 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/i2c/twl4030.h>
#include <linux/regulator/machine.h>
#include <mach/hardware.h>
#include <mach/control.h>
#include <mach/mmc.h>
#include <mach/board.h>
#include "mmc-twl4030.h"
#if defined(CONFIG_TWL4030_CORE) && \
(defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))
#define LDO_CLR 0x00
#define VSEL_S2_CLR 0x40
#define VMMC1_DEV_GRP 0x27
#define VMMC1_CLR 0x00
#define VMMC1_315V 0x03
#define VMMC1_300V 0x02
#define VMMC1_285V 0x01
#define VMMC1_185V 0x00
#define VMMC1_DEDICATED 0x2A
#define VMMC2_DEV_GRP 0x2B
#define VMMC2_CLR 0x40
#define VMMC2_315V 0x0c
#define VMMC2_300V 0x0b
#define VMMC2_285V 0x0a
#define VMMC2_280V 0x09
#define VMMC2_260V 0x08
#define VMMC2_185V 0x06
#define VMMC2_DEDICATED 0x2E
#define VMMC_DEV_GRP_P1 0x20
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;
u8 twl_vmmc_dev_grp;
u8 twl_mmc_dedicated;
char name[HSMMC_NAME_LEN + 1];
} hsmmc[OMAP34XX_NR_MMC] = {
{
.twl_vmmc_dev_grp = VMMC1_DEV_GRP,
.twl_mmc_dedicated = VMMC1_DEDICATED,
},
{
.twl_vmmc_dev_grp = VMMC2_DEV_GRP,
.twl_mmc_dedicated = VMMC2_DEDICATED,
},
};
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;
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;
for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
if (hsmmc[i].name == mmc->slots[0].name) {
hsmmc[i].mmc = mmc;
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;
gpio_free(mmc->slots[0].switch_pin);
}
#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
/*
* Sets the MMC voltage in twl4030
*/
#define MMC1_OCR (MMC_VDD_165_195 \
|MMC_VDD_28_29|MMC_VDD_29_30|MMC_VDD_30_31|MMC_VDD_31_32)
#define MMC2_OCR (MMC_VDD_165_195 \
|MMC_VDD_25_26|MMC_VDD_26_27|MMC_VDD_27_28 \
|MMC_VDD_28_29|MMC_VDD_29_30|MMC_VDD_30_31|MMC_VDD_31_32)
static int twl_mmc_set_voltage(struct twl_mmc_controller *c, int vdd)
{
int ret;
u8 vmmc = 0, dev_grp_val;
if (!vdd)
goto doit;
if (c->twl_vmmc_dev_grp == VMMC1_DEV_GRP) {
/* VMMC1: max 220 mA. And for 8-bit mode,
* VSIM: max 50 mA
*/
switch (1 << vdd) {
case MMC_VDD_165_195:
vmmc = VMMC1_185V;
/* and VSIM_180V */
break;
case MMC_VDD_28_29:
vmmc = VMMC1_285V;
/* and VSIM_280V */
break;
case MMC_VDD_29_30:
case MMC_VDD_30_31:
vmmc = VMMC1_300V;
/* and VSIM_300V */
break;
case MMC_VDD_31_32:
vmmc = VMMC1_315V;
/* error if VSIM needed */
break;
default:
return -EINVAL;
}
} else if (c->twl_vmmc_dev_grp == VMMC2_DEV_GRP) {
/* VMMC2: max 100 mA */
switch (1 << vdd) {
case MMC_VDD_165_195:
vmmc = VMMC2_185V;
break;
case MMC_VDD_25_26:
case MMC_VDD_26_27:
vmmc = VMMC2_260V;
break;
case MMC_VDD_27_28:
vmmc = VMMC2_280V;
break;
case MMC_VDD_28_29:
vmmc = VMMC2_285V;
break;
case MMC_VDD_29_30:
case MMC_VDD_30_31:
vmmc = VMMC2_300V;
break;
case MMC_VDD_31_32:
vmmc = VMMC2_315V;
break;
default:
return -EINVAL;
}
} else {
return -EINVAL;
}
doit:
if (vdd)
dev_grp_val = VMMC_DEV_GRP_P1; /* Power up */
else
dev_grp_val = LDO_CLR; /* Power down */
ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
dev_grp_val, c->twl_vmmc_dev_grp);
if (ret || !vdd)
return ret;
ret = twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
vmmc, c->twl_mmc_dedicated);
return ret;
}
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 using the same TWL VMMC1 supply (hsmmc[0]); 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.
*/
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 = twl_mmc_set_voltage(c, 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 = twl_mmc_set_voltage(c, 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_mmc2_set_power(struct device *dev, int slot, int power_on, int vdd)
{
int ret;
struct twl_mmc_controller *c = &hsmmc[1];
struct omap_mmc_platform_data *mmc = dev->platform_data;
/*
* Assume TWL VMMC2 (hsmmc[1]) 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.
*/
if (power_on) {
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 = twl_mmc_set_voltage(c, vdd);
} else {
ret = twl_mmc_set_voltage(c, 0);
}
return ret;
}
static int twl_mmc3_set_power(struct device *dev, int slot, int power_on,
int vdd)
{
/*
* Assume MMC3 has self-powered device connected, for example on-board
* chip with external power source.
*/
return 0;
}
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;
/* note: twl4030 card detect GPIOs normally switch VMMCx ... */
if (gpio_is_valid(c->gpio_cd)) {
mmc->init = twl_mmc_late_init;
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;
/* 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;
/* NOTE: we assume OMAP's MMC1 and MMC2 use
* the TWL4030's VMMC1 and VMMC2, respectively;
* and that MMC3 device has it's own power source.
*/
switch (c->mmc) {
case 1:
mmc->slots[0].set_power = twl_mmc1_set_power;
mmc->slots[0].ocr_mask = MMC1_OCR;
break;
case 2:
mmc->slots[0].set_power = twl_mmc2_set_power;
if (c->transceiver)
mmc->slots[0].ocr_mask = MMC2_OCR;
else
mmc->slots[0].ocr_mask = MMC_VDD_165_195;
break;
case 3:
mmc->slots[0].set_power = twl_mmc3_set_power;
mmc->slots[0].ocr_mask = MMC_VDD_165_195;
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
