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>

diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
index 2d36f3a..1ef54b0 100644 (file)
--- 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 (file)
--- 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)