[U-Boot] [PATCH 2/3] esdhc: Detecting 8 bit width before mmc initialization

[Haijun Zhang]

The upper 4 data signals of esdhc are shared with spi flash.
So detect if the upper 4 pins are assigned to esdhc
before enable sdhc 8 bit width.

Signed-off-by: Haijun Zhang <Haijun.Zhang at freescale.com>
---
 drivers/mmc/fsl_esdhc.c    | 6 ++++++
 include/configs/T4240QDS.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index e330379..524cc10 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -593,6 +593,12 @@ int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg *cfg)
 			mmc->host_caps &= ~MMC_MODE_4BIT;
 	}
 
+	/* Detect if the upper 4 pins are used for ESDHC */
+#if defined(CONFIG_T4240QDS)
+	if (!(readb(QIXIS_BASE + QIXIS_BRDCFG5) & QIXIS_MUX_SDHC_WIDTH8))
+		mmc->host_caps &= ~MMC_MODE_8BIT;
+#endif
+
 	if (caps & ESDHC_HOSTCAPBLT_HSS)
 		mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
 
diff --git a/include/configs/T4240QDS.h b/include/configs/T4240QDS.h
index 3777ccb..77e8ac0 100644
--- a/include/configs/T4240QDS.h
+++ b/include/configs/T4240QDS.h
@@ -165,6 +165,8 @@ unsigned long get_board_ddr_clk(void);
 #define QIXIS_RCFG_CTL_RECONFIG_IDLE	0x20
 #define QIXIS_RCFG_CTL_RECONFIG_START	0x21
 #define QIXIS_RCFG_CTL_WATCHDOG_ENBLE	0x08
+#define QIXIS_BRDCFG5			0x55
+#define QIXIS_MUX_SDHC_WIDTH8		1
 #define QIXIS_BASE_PHYS		(0xf00000000ull | QIXIS_BASE)
 
 #define CONFIG_SYS_CSPR3_EXT	(0xf)
-- 
1.8.4