s5p_mmc: support 8-bit bus width

This Patch do support 8-bit bus width for s5p
So we add parameter for bus_width (in s5p_mmc_init(), s5p_mmc_initialize())
If want to use 8-bit bus width, only change (0, 8) instead of (0, 4).

 Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
 Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
 Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

arch/arm/include/asm/arch-s5pc1xx/mmc.h

@@ -65,7 +65,7 @@ struct mmc_host {
 	unsigned int clock;	/* Current clock (MHz) */
 };
 
-int s5p_mmc_init(int dev_index);
+int s5p_mmc_init(int dev_index, int bus_width);
 
 #endif	/* __ASSEMBLY__ */
 #endif

board/samsung/goni/goni.c

@@ -87,6 +87,6 @@ int board_mmc_init(bd_t *bis)
 		gpio_set_drv(&s5pc110_gpio->g0, i, GPIO_DRV_4X);
 	}
 
-	return s5p_mmc_init(0);
+	return s5p_mmc_init(0, 4);
 }
 #endif

drivers/mmc/s5p_mmc.c

@@ -352,11 +352,16 @@ static void mmc_set_ios(struct mmc *mmc)
 	ctrl = readb(&host->reg->hostctl);
 
 	/*
+	 * WIDE8[5]
+	 * 0 = Depend on WIDE4
+	 * 1 = 8-bit mode
 	 * WIDE4[1]
 	 * 1 = 4-bit mode
 	 * 0 = 1-bit mode
 	 */
-	if (mmc->bus_width == 4)
+	if (mmc->bus_width == 8)
+		ctrl |= (1 << 5);
+	else if (mmc->bus_width == 4)
 		ctrl |= (1 << 1);
 	else
 		ctrl &= ~(1 << 1);
@@ -437,7 +442,7 @@ static int mmc_core_init(struct mmc *mmc)
 	return 0;
 }
 
-static int s5p_mmc_initialize(int dev_index)
+static int s5p_mmc_initialize(int dev_index, int bus_width)
 {
 	struct mmc *mmc;
 
@@ -450,7 +455,11 @@ static int s5p_mmc_initialize(int dev_index)
 	mmc->init = mmc_core_init;
 
 	mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
-	mmc->host_caps = MMC_MODE_4BIT | MMC_MODE_HS_52MHz | MMC_MODE_HS;
+	if (bus_width == 8)
+		mmc->host_caps = MMC_MODE_8BIT;
+	else
+		mmc->host_caps = MMC_MODE_4BIT;
+	mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
 
 	mmc->f_min = 400000;
 	mmc->f_max = 52000000;
@@ -462,7 +471,7 @@ static int s5p_mmc_initialize(int dev_index)
 	return 0;
 }
 
-int s5p_mmc_init(int dev_index)
+int s5p_mmc_init(int dev_index, int bus_width)
 {
-	return s5p_mmc_initialize(dev_index);
+	return s5p_mmc_initialize(dev_index, bus_width);
 }