diff options
author | kishore kadiyala <kishore.kadiyala@ti.com> | 2010-05-15 18:21:25 +0000 |
---|---|---|
committer | Tony Lindgren <tony@atomide.com> | 2010-05-20 11:21:22 -0700 |
commit | c83c8e6cde35c51a120952f54b4e4ecda6fa58a5 (patch) | |
tree | fa92fc248a25905730352d317bbf67a0c0e20602 /arch/arm/mach-omap2/hsmmc.c | |
parent | 717c1fbf7c139c3c5d5920b29bdf196d07a40c8a (diff) |
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>
Diffstat (limited to 'arch/arm/mach-omap2/hsmmc.c')
-rw-r--r-- | arch/arm/mach-omap2/hsmmc.c | 97 |
1 files changed, 88 insertions, 9 deletions
diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c index 2d36f3afbd4..1ef54b03610 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 */ |