From 1727e216987a2d4e3e220f8c09e4bb54a611d21e Mon Sep 17 00:00:00 2001 From: Jaehoon Chung Date: Mon, 27 Sep 2010 15:43:52 +0900 Subject: 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 Signed-off-by: Minkyu Kang Signed-off-by: Kyungmin Park --- drivers/mmc/s5p_mmc.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'drivers') 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); } -- cgit v1.1