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authorJaehoon Chung <jh80.chung@samsung.com>2010-09-27 15:43:52 +0900
committerMinkyu Kang <mk7.kang@samsung.com>2010-10-19 11:34:54 +0900
commit1727e216987a2d4e3e220f8c09e4bb54a611d21e (patch)
tree516cb0f48465b36d7c8ed2f030813ee8164e92d5 /drivers/mmc
parentb485556be51d1edae0a2c0065e2f572ca42a1eee (diff)
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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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/s5p_mmc.c19
1 files changed, 14 insertions, 5 deletions
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 @@ 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);
}