ARM: OMAP: hsmmc: Add support for MMC 2 setup for AM35x

AM35x MMC 2 controller has internal clock loopback setting which cannot
be utilized without this patch and thus SDIO devices connected to this
controller and depend on this setting will fail to initialize.

Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
[tony@atomide.com: updated comments]
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 30 insertions, 12 deletions

diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
index 97dfedce084..59830d0eeb5 100644
--- a/arch/arm/mach-omap2/hsmmc.c
+++ b/arch/arm/mach-omap2/hsmmc.c
@@ -171,6 +171,17 @@ static void omap4_hsmmc1_after_set_reg(struct device *dev, int slot,
         }
 }
 
+static void hsmmc2_select_input_clk_src(struct omap_mmc_platform_data *mmc)
+{
+        u32 reg;
+
+        if (mmc->slots[0].internal_clock) {
+                reg = omap_ctrl_readl(control_devconf1_offset);
+                reg |= OMAP2_MMCSDIO2ADPCLKISEL;
+                omap_ctrl_writel(reg, control_devconf1_offset);
+        }
+}
+
 static void hsmmc23_before_set_reg(struct device *dev, int slot,
                                    int power_on, int vdd)
 {
@@ -179,16 +190,19 @@ static void hsmmc23_before_set_reg(struct device *dev, int slot,
         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;
+        if (power_on)
+                hsmmc2_select_input_clk_src(mmc);
+}
 
-                        reg = omap_ctrl_readl(control_devconf1_offset);
-                        reg |= OMAP2_MMCSDIO2ADPCLKISEL;
-                        omap_ctrl_writel(reg, control_devconf1_offset);
-                }
-        }
+static int am35x_hsmmc2_set_power(struct device *dev, int slot,
+                                  int power_on, int vdd)
+{
+        struct omap_mmc_platform_data *mmc = dev->platform_data;
+
+        if (power_on)
+                hsmmc2_select_input_clk_src(mmc);
+
+        return 0;
 }
 
 static int nop_mmc_set_power(struct device *dev, int slot, int power_on,
@@ -339,9 +353,7 @@ static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
          */
         mmc->slots[0].ocr_mask = c->ocr_mask;
 
-        if (cpu_is_omap3517() || cpu_is_omap3505())
-                mmc->slots[0].set_power = nop_mmc_set_power;
-        else
+        if (!cpu_is_omap3517() && !cpu_is_omap3505())
                 mmc->slots[0].features |= HSMMC_HAS_PBIAS;
 
         if (cpu_is_omap44xx() && (omap_rev() > OMAP4430_REV_ES1_0))
@@ -364,6 +376,9 @@ static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
                         }
                 }
 
+                if (cpu_is_omap3517() || cpu_is_omap3505())
+                        mmc->slots[0].set_power = nop_mmc_set_power;
+
                 /* OMAP3630 HSMMC1 supports only 4-bit */
                 if (cpu_is_omap3630() &&
                                 (c->caps & MMC_CAP_8_BIT_DATA)) {
@@ -373,6 +388,9 @@ static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
                 }
                 break;
         case 2:
+                if (cpu_is_omap3517() || cpu_is_omap3505())
+                        mmc->slots[0].set_power = am35x_hsmmc2_set_power;
+
                 if (c->ext_clock)
                         c->transceiver = 1;
                 if (c->transceiver && (c->caps & MMC_CAP_8_BIT_DATA)) {