[U-Boot] [PATCH V2 1/3] mmc: fsl: reset to normal boot mode when eMMC fast boot

[Peng Fan <van.freenix@gmail.com>]

When booting in eMMC fast boot, MMC host does not exit from
boot mode after bootrom loading image. So the first command
'CMD0' sent in uboot will pull down the CMD line to low and
cause errors.

This patch cleans the MMC boot register in "mmc_init" to put the
MMC host back to normal mode.

Also clear DLL_CTRL delay line settings at USDHC initialization
to eliminate the pre-settings from boot rom.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
---

V2:
 Rebased to lastest u-boot master

 drivers/mmc/fsl_esdhc.c | 38 +++++++++++++++++++++++++++++---------
 include/fsl_esdhc.h     |  6 ++++++
 2 files changed, 35 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 57ad975..9cd582f 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -56,21 +56,27 @@ struct fsl_esdhc {
 	uint    fevt;		/* Force event register */
 	uint    admaes;		/* ADMA error status register */
 	uint    adsaddr;	/* ADMA system address register */
-	char    reserved2[100];	/* reserved */
-	uint    vendorspec;	/* Vendor Specific register */
-	char    reserved3[56];	/* reserved */
+	char    reserved2[4];
+	uint    dllctrl;
+	uint    dllstat;
+	uint    clktunectrlstatus;
+	char    reserved3[84];
+	uint    vendorspec;
+	uint    mmcboot;
+	uint    vendorspec2;
+	char	reserved4[48];
 	uint    hostver;	/* Host controller version register */
-	char    reserved4[4];	/* reserved */
-	uint    dmaerraddr;	/* DMA error address register */
 	char    reserved5[4];	/* reserved */
-	uint    dmaerrattr;	/* DMA error attribute register */
+	uint    dmaerraddr;	/* DMA error address register */
 	char    reserved6[4];	/* reserved */
+	uint    dmaerrattr;	/* DMA error attribute register */
+	char    reserved7[4];	/* reserved */
 	uint    hostcapblt2;	/* Host controller capabilities register 2 */
-	char    reserved7[8];	/* reserved */
+	char    reserved8[8];	/* reserved */
 	uint    tcr;		/* Tuning control register */
-	char    reserved8[28];	/* reserved */
+	char    reserved9[28];	/* reserved */
 	uint    sddirctl;	/* SD direction control register */
-	char    reserved9[712];	/* reserved */
+	char    reserved10[712];/* reserved */
 	uint    scr;		/* eSDHC control register */
 };
 
@@ -616,6 +622,20 @@ static int esdhc_init(struct mmc *mmc)
 	while ((esdhc_read32(&regs->sysctl) & SYSCTL_RSTA) && --timeout)
 		udelay(1000);
 
+#if defined(CONFIG_FSL_USDHC)
+	/* RSTA doesn't reset MMC_BOOT register, so manually reset it */
+	esdhc_write32(&regs->mmcboot, 0x0);
+	/* Reset MIX_CTRL and CLK_TUNE_CTRL_STATUS regs to 0 */
+	esdhc_write32(&regs->mixctrl, 0x0);
+	esdhc_write32(&regs->clktunectrlstatus, 0x0);
+
+	/* Put VEND_SPEC to default value */
+	esdhc_write32(&regs->vendorspec, VENDORSPEC_INIT);
+
+	/* Disable DLL_CTRL delay line */
+	esdhc_write32(&regs->dllctrl, 0x0);
+#endif
+
 #ifndef ARCH_MXC
 	/* Enable cache snooping */
 	esdhc_write32(&regs->scr, 0x00000040);
diff --git a/include/fsl_esdhc.h b/include/fsl_esdhc.h
index fa760a5..78c67c8 100644
--- a/include/fsl_esdhc.h
+++ b/include/fsl_esdhc.h
@@ -35,6 +35,12 @@
 #define SYSCTL_RSTC		0x02000000
 #define SYSCTL_RSTD		0x04000000
 
+#define VENDORSPEC_CKEN		0x00004000
+#define VENDORSPEC_PEREN	0x00002000
+#define VENDORSPEC_HCKEN	0x00001000
+#define VENDORSPEC_IPGEN	0x00000800
+#define VENDORSPEC_INIT		0x20007809
+
 #define IRQSTAT			0x0002e030
 #define IRQSTAT_DMAE		(0x10000000)
 #define IRQSTAT_AC12E		(0x01000000)
-- 
2.6.2