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linux-next/arch/arm/mach-omap2/hsmmc.c
Adrian Hunter e0eb242446 omap_hsmmc: Allow for a shared VccQ 
EMMC can have two voltage supplies, Vcc and VccQ
which are implemented in the code as consumer
supplies vmmc and vmmc_aux.

If the regulator that supplies vmmc_aux is shared
with other consumers, then sending it to sleep
will disrupt those consumers.  However, the
TWL4030-family regulators may have OFF remapped
to SLEEP, in which case 'regulator_disable()'
will put the regulator to sleep only when all
consumers are disabled - which is the desired
behaviour.

This patch adds a platform data field to allow
that option.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2010-02-15 10:03:34 -08:00

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/*
* linux/arch/arm/mach-omap2/hsmmc.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/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <mach/hardware.h>
#include <plat/control.h>
#include <plat/mmc.h>
#include <plat/omap-pm.h>
#include "hsmmc.h"
#if 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 hsmmc_controller {
char name[HSMMC_NAME_LEN + 1];
} hsmmc[OMAP34XX_NR_MMC];
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
static int hsmmc_get_context_loss(struct device *dev)
{
return omap_pm_get_dev_context_loss_count(dev);
}
#else
#define hsmmc_get_context_loss NULL
#endif
static void hsmmc1_before_set_reg(struct device *dev, int slot,
int power_on, int vdd)
{
u32 reg, prog_io;
struct omap_mmc_platform_data *mmc = dev->platform_data;
if (mmc->slots[0].remux)
mmc->slots[0].remux(dev, slot, power_on);
/*
* 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);
if (cpu_is_omap3630()) {
/* Set MMC I/O to 52Mhz */
prog_io = omap_ctrl_readl(OMAP343X_CONTROL_PROG_IO1);
prog_io |= OMAP3630_PRG_SDMMC1_SPEEDCTRL;
omap_ctrl_writel(prog_io, OMAP343X_CONTROL_PROG_IO1);
} else {
reg |= OMAP2_PBIASSPEEDCTRL0;
}
reg &= ~OMAP2_PBIASLITEPWRDNZ0;
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);
}
}
static void hsmmc1_after_set_reg(struct device *dev, int slot,
int power_on, int vdd)
{
u32 reg;
/* 100ms delay required for PBIAS configuration */
msleep(100);
if (power_on) {
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_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
OMAP2_PBIASLITEVMODE0);
omap_ctrl_writel(reg, control_pbias_offset);
}
}
static void hsmmc23_before_set_reg(struct device *dev, int slot,
int power_on, int vdd)
{
struct omap_mmc_platform_data *mmc = dev->platform_data;
if (mmc->slots[0].remux)
mmc->slots[0].remux(dev, slot, power_on);
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);
}
}
}
static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;
void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
{
struct omap2_hsmmc_info *c;
int nr_hsmmc = ARRAY_SIZE(hsmmc_data);
int i;
if (cpu_is_omap2430()) {
control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
} else {
control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
}
for (c = controllers; c->mmc; c++) {
struct hsmmc_controller *hc = 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");
goto done;
}
if (c->name)
strncpy(hc->name, c->name, HSMMC_NAME_LEN);
else
snprintf(hc->name, ARRAY_SIZE(hc->name),
"mmc%islot%i", c->mmc, 1);
mmc->slots[0].name = hc->name;
mmc->nr_slots = 1;
mmc->slots[0].wires = c->wires;
mmc->slots[0].internal_clock = !c->ext_clock;
mmc->dma_mask = 0xffffffff;
mmc->get_context_loss_count = hsmmc_get_context_loss;
mmc->slots[0].switch_pin = c->gpio_cd;
mmc->slots[0].gpio_wp = c->gpio_wp;
mmc->slots[0].remux = c->remux;
if (c->cover_only)
mmc->slots[0].cover = 1;
if (c->nonremovable)
mmc->slots[0].nonremovable = 1;
if (c->power_saving)
mmc->slots[0].power_saving = 1;
if (c->no_off)
mmc->slots[0].no_off = 1;
if (c->vcc_aux_disable_is_sleep)
mmc->slots[0].vcc_aux_disable_is_sleep = 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].before_set_reg = hsmmc1_before_set_reg;
mmc->slots[0].after_set_reg = hsmmc1_after_set_reg;
/* Omap3630 HSMMC1 supports only 4-bit */
if (cpu_is_omap3630() && c->wires > 4) {
c->wires = 4;
mmc->slots[0].wires = c->wires;
}
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].before_set_reg = hsmmc23_before_set_reg;
mmc->slots[0].after_set_reg = NULL;
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;
}
done:
for (i = 0; i < nr_hsmmc; i++)
kfree(hsmmc_data[i]);
}
#endif
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