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>
diff --git a/drivers/mmc/s5p_mmc.c b/drivers/mmc/s5p_mmc.c
index 1fd425c..195b5be 100644
--- a/drivers/mmc/s5p_mmc.c
+++ b/drivers/mmc/s5p_mmc.c
@@ -352,11 +352,16 @@
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 @@
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 @@
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 @@
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);
}