[U-Boot] [PATCH V2 2/3] fsl_esdhc: Update clock enable bits for USDHC

[Peng Fan]

From: Ye Li <ye.li at nxp.com>

The USDHC move the 4 clock bits CARD_CLK_SOFT_EN, IPG_PERCLK_SOFT_EN,
HCLK_SOFT_EN, and IPG_CLK_SOFT_EN from sysctl register to vendorspec
register. The driver uses RSTA to replace the clock gate off
operation. But this is not a good solution. This is because:
1. when using RSTA, we should wait this bit to clear by itself. This is not
   implemeneted in the code.
2. After RSTA is set, it is recommended that the Host Driver reset the
   external card and reinitialize it.

So in this patch, we change to use the vendorspec registers for these bits
operation.

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

V2:
 Rebased to latest U-Boot master

 drivers/mmc/fsl_esdhc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 9cd582f..d3a18c0 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -538,7 +538,7 @@ static void set_sysctl(struct mmc *mmc, uint clock)
 	clk = (pre_div << 8) | (div << 4);
 
 #ifdef CONFIG_FSL_USDHC
-	esdhc_setbits32(&regs->sysctl, SYSCTL_RSTA);
+	esdhc_clrbits32(&regs->vendorspec, VENDORSPEC_CKEN);
 #else
 	esdhc_clrbits32(&regs->sysctl, SYSCTL_CKEN);
 #endif
@@ -548,7 +548,7 @@ static void set_sysctl(struct mmc *mmc, uint clock)
 	udelay(10000);
 
 #ifdef CONFIG_FSL_USDHC
-	esdhc_clrbits32(&regs->sysctl, SYSCTL_RSTA);
+	esdhc_setbits32(&regs->vendorspec, VENDORSPEC_PEREN | VENDORSPEC_CKEN);
 #else
 	esdhc_setbits32(&regs->sysctl, SYSCTL_PEREN | SYSCTL_CKEN);
 #endif
@@ -643,6 +643,8 @@ static int esdhc_init(struct mmc *mmc)
 
 #ifndef CONFIG_FSL_USDHC
 	esdhc_setbits32(&regs->sysctl, SYSCTL_HCKEN | SYSCTL_IPGEN);
+#else
+	esdhc_setbits32(&regs->vendorspec, VENDORSPEC_HCKEN | VENDORSPEC_IPGEN);
 #endif
 
 	/* Set the initial clock speed */
@@ -740,6 +742,9 @@ static int fsl_esdhc_init(struct fsl_esdhc_priv *priv)
 #ifndef CONFIG_FSL_USDHC
 	esdhc_setbits32(&regs->sysctl, SYSCTL_PEREN | SYSCTL_HCKEN
 				| SYSCTL_IPGEN | SYSCTL_CKEN);
+#else
+	esdhc_setbits32(&regs->vendorspec, VENDORSPEC_PEREN |
+			VENDORSPEC_HCKEN | VENDORSPEC_IPGEN | VENDORSPEC_CKEN);
 #endif
 
 	writel(SDHCI_IRQ_EN_BITS, &regs->irqstaten);
-- 
2.6.2