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omap4: Adding PBIAS Configuration for MMC1 Controller 

In OMAP4, MMC1 PBIAS and its associated IO is software-controlled
by CONTROL_PBIAS and CONTROL_MMC1 registers. This patch adds PBIAS
configuration for MMC1 Controller during power-ON and power-OFF
of regulator.

Signed-off-by: Kishore Kadiyala <kishore.kadiyala@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
kishore kadiyala 2010-05-15 18:21:25 +00:00 committed by Tony Lindgren
parent 717c1fbf7c
commit c83c8e6cde
2 changed files with 108 additions and 9 deletions
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97
arch/arm/mach-omap2/hsmmc.c
View File

@ -24,6 +24,7 @@
static u16 control_pbias_offset;
static u16 control_devconf1_offset;
static u16 control_mmc1;
#define HSMMC_NAME_LEN 9
@ -42,7 +43,7 @@ static int hsmmc_get_context_loss(struct device *dev)
#define hsmmc_get_context_loss NULL
#endif
static void hsmmc1_before_set_reg(struct device *dev, int slot,
static void omap_hsmmc1_before_set_reg(struct device *dev, int slot,
int power_on, int vdd)
{
u32 reg, prog_io;
@ -95,7 +96,7 @@ static void hsmmc1_before_set_reg(struct device *dev, int slot,
}
}
static void hsmmc1_after_set_reg(struct device *dev, int slot,
static void omap_hsmmc1_after_set_reg(struct device *dev, int slot,
int power_on, int vdd)
{
u32 reg;
@ -119,6 +120,60 @@ static void hsmmc1_after_set_reg(struct device *dev, int slot,
}
}
static void omap4_hsmmc1_before_set_reg(struct device *dev, int slot,
int power_on, int vdd)
{
u32 reg;
/*
* 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 ...
*/
reg = omap_ctrl_readl(control_pbias_offset);
reg &= ~(OMAP4_MMC1_PBIASLITE_PWRDNZ | OMAP4_MMC1_PWRDNZ |
OMAP4_USBC1_ICUSB_PWRDNZ);
omap_ctrl_writel(reg, control_pbias_offset);
}
static void omap4_hsmmc1_after_set_reg(struct device *dev, int slot,
int power_on, int vdd)
{
u32 reg;
if (power_on) {
reg = omap_ctrl_readl(control_pbias_offset);
reg |= OMAP4_MMC1_PBIASLITE_PWRDNZ;
if ((1 << vdd) <= MMC_VDD_165_195)
reg &= ~OMAP4_MMC1_PBIASLITE_VMODE;
else
reg |= OMAP4_MMC1_PBIASLITE_VMODE;
reg |= (OMAP4_MMC1_PBIASLITE_PWRDNZ | OMAP4_MMC1_PWRDNZ |
OMAP4_USBC1_ICUSB_PWRDNZ);
omap_ctrl_writel(reg, control_pbias_offset);
/* 4 microsec delay for comparator to generate an error*/
udelay(4);
reg = omap_ctrl_readl(control_pbias_offset);
if (reg & OMAP4_MMC1_PBIASLITE_VMODE_ERROR) {
pr_err("Pbias Voltage is not same as LDO\n");
/* Caution : On VMODE_ERROR Power Down MMC IO */
reg &= ~(OMAP4_MMC1_PWRDNZ | OMAP4_USBC1_ICUSB_PWRDNZ);
omap_ctrl_writel(reg, control_pbias_offset);
}
} else {
reg = omap_ctrl_readl(control_pbias_offset);
reg |= (OMAP4_MMC1_PBIASLITE_PWRDNZ |
OMAP4_MMC1_PBIASLITE_VMODE | OMAP4_MMC1_PWRDNZ |
OMAP4_USBC1_ICUSB_PWRDNZ);
omap_ctrl_writel(reg, control_pbias_offset);
}
}
static void hsmmc23_before_set_reg(struct device *dev, int slot,
int power_on, int vdd)
{
@ -152,13 +207,28 @@ void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
struct omap2_hsmmc_info *c;
int nr_hsmmc = ARRAY_SIZE(hsmmc_data);
int i;
u32 reg;
if (cpu_is_omap2430()) {
control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
if (!cpu_is_omap44xx()) {
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;
}
} else {
control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
control_pbias_offset = OMAP44XX_CONTROL_PBIAS_LITE;
control_mmc1 = OMAP44XX_CONTROL_MMC1;
reg = omap_ctrl_readl(control_mmc1);
reg |= (OMAP4_CONTROL_SDMMC1_PUSTRENGTHGRP0 |
OMAP4_CONTROL_SDMMC1_PUSTRENGTHGRP1);
reg &= ~(OMAP4_CONTROL_SDMMC1_PUSTRENGTHGRP2 |
OMAP4_CONTROL_SDMMC1_PUSTRENGTHGRP3);
reg |= (OMAP4_CONTROL_SDMMC1_DR0_SPEEDCTRL |
OMAP4_CONTROL_SDMMC1_DR1_SPEEDCTRL |
OMAP4_CONTROL_SDMMC1_DR2_SPEEDCTRL);
omap_ctrl_writel(reg, control_mmc1);
}
for (c = controllers; c->mmc; c++) {
@ -231,8 +301,17 @@ void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
case 1:
if (mmc->slots[0].features & HSMMC_HAS_PBIAS) {
/* 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;
if (cpu_is_omap44xx()) {
mmc->slots[0].before_set_reg =
omap4_hsmmc1_before_set_reg;
mmc->slots[0].after_set_reg =
omap4_hsmmc1_after_set_reg;
} else {
mmc->slots[0].before_set_reg =
omap_hsmmc1_before_set_reg;
mmc->slots[0].after_set_reg =
omap_hsmmc1_after_set_reg;
}
}
/* Omap3630 HSMMC1 supports only 4-bit */

20
arch/arm/plat-omap/include/plat/control.h
View File

@ -207,6 +207,9 @@
/* 44xx control status register offset */
#define OMAP44XX_CONTROL_STATUS 0x2c4
/* 44xx-only CONTROL_GENERAL register offsets */
#define OMAP44XX_CONTROL_MMC1 0x628
#define OMAP44XX_CONTROL_PBIAS_LITE 0x600
/*
* REVISIT: This list of registers is not comprehensive - there are more
* that should be added.
@ -252,6 +255,23 @@
#define OMAP2_PBIASLITEPWRDNZ0 (1 << 1)
#define OMAP2_PBIASLITEVMODE0 (1 << 0)
/* CONTROL_PBIAS_LITE bits for OMAP4 */
#define OMAP4_MMC1_PWRDNZ (1 << 26)
#define OMAP4_MMC1_PBIASLITE_HIZ_MODE (1 << 25)
#define OMAP4_MMC1_PBIASLITE_SUPPLY_HI_OUT (1 << 24)
#define OMAP4_MMC1_PBIASLITE_VMODE_ERROR (1 << 23)
#define OMAP4_MMC1_PBIASLITE_PWRDNZ (1 << 22)
#define OMAP4_MMC1_PBIASLITE_VMODE (1 << 21)
#define OMAP4_USBC1_ICUSB_PWRDNZ (1 << 20)
#define OMAP4_CONTROL_SDMMC1_PUSTRENGTHGRP0 (1 << 31)
#define OMAP4_CONTROL_SDMMC1_PUSTRENGTHGRP1 (1 << 30)
#define OMAP4_CONTROL_SDMMC1_PUSTRENGTHGRP2 (1 << 29)
#define OMAP4_CONTROL_SDMMC1_PUSTRENGTHGRP3 (1 << 28)
#define OMAP4_CONTROL_SDMMC1_DR0_SPEEDCTRL (1 << 27)
#define OMAP4_CONTROL_SDMMC1_DR1_SPEEDCTRL (1 << 26)
#define OMAP4_CONTROL_SDMMC1_DR2_SPEEDCTRL (1 << 25)
/* CONTROL_PROG_IO1 bits */
#define OMAP3630_PRG_SDMMC1_SPEEDCTRL (1 << 20)