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@xxxxxx>
---
arch/arm/mach-omap2/hsmmc.c | 97 ++++++++++++++++++++++++++---
arch/arm/plat-omap/include/plat/control.h | 20 ++++++
2 files changed, 108 insertions(+), 9 deletions(-)
diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
index 2d36f3a..1ef54b0 100644
--- a/arch/arm/mach-omap2/hsmmc.c
+++ b/arch/arm/mach-omap2/hsmmc.c
@@ -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 */
diff --git a/arch/arm/plat-omap/include/plat/control.h b/arch/arm/plat-omap/include/plat/control.h
index a56deee..131bf40 100644
--- a/arch/arm/plat-omap/include/plat/control.h
+++ b/arch/arm/plat-omap/include/plat/control.h
@@ -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)
--
1.6.3.3
--
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