From: Jaehoon Chung <jh80.chung@samsung.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] s5p_mmc: support 8-bit bus width
Date: Mon, 27 Sep 2010 15:43:52 +0900 [thread overview]
Message-ID: <4CA03D28.1090507@samsung.com> (raw)
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 | 2 +-
board/samsung/goni/goni.c | 2 +-
drivers/mmc/s5p_mmc.c | 19 ++++++++++++++-----
3 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/arch/arm/include/asm/arch-s5pc1xx/mmc.h b/arch/arm/include/asm/arch-s5pc1xx/mmc.h
index 68c59d1..48de64d 100644
--- a/arch/arm/include/asm/arch-s5pc1xx/mmc.h
+++ b/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
diff --git a/board/samsung/goni/goni.c b/board/samsung/goni/goni.c
index 4336729..0b09eba 100644
--- a/board/samsung/goni/goni.c
+++ b/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
diff --git a/drivers/mmc/s5p_mmc.c b/drivers/mmc/s5p_mmc.c
index 1fd425c..e5208d3 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);
}
--
1.6.0.4
next reply other threads:[~2010-09-27 6:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-27 6:43 Jaehoon Chung [this message]
2010-10-19 2:37 ` [U-Boot] [PATCH] s5p_mmc: support 8-bit bus width Minkyu Kang
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