commit 48bb3bb5ac4dd21e931ae157caad6449bcb2d0d4
author Jerry Huang <Chang-Ming.Huang@freescale.com> Thu Mar 18 15:57:06 2010 -0500
committer Kumar Gala <galak@kernel.crashing.org> Wed Apr 07 00:01:11 2010 -0500
tree c5d04449f57b2ef4817a2b5e050d8437683fa1b1
parent cc4d1226585fa2544b5116702b02eacbb7aa48a1

fsl_esdhc: Add function to reset the eSDHC controller

To support multiple block read command we must set abort or use auto
CMD12.  If we booted from eSDHC controller neither of these are used
and thus we need to reset the controller to allow multiple block read
to function.

Signed-off-by: Jerry Huang <Chang-Ming.Huang@freescale.com>
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Acked-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

drivers/mmc/fsl_esdhc.c

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index 85354e8..999b581 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -344,6 +344,20 @@
 	return ret;
 }
 
+static void esdhc_reset(struct fsl_esdhc *regs)
+{
+	unsigned long timeout = 100; /* wait max 100 ms */
+
+	/* reset the controller */
+	esdhc_write32(&regs->sysctl, SYSCTL_RSTA);
+
+	/* hardware clears the bit when it is done */
+	while ((esdhc_read32(&regs->sysctl) & SYSCTL_RSTA) && --timeout)
+		udelay(1000);
+	if (!timeout)
+		printf("MMC/SD: Reset never completed.\n");
+}
+
 int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg *cfg)
 {
 	struct fsl_esdhc *regs;
@@ -358,6 +372,9 @@
 	sprintf(mmc->name, "FSL_ESDHC");
 	regs = (struct fsl_esdhc *)cfg->esdhc_base;
 
+	/* First reset the eSDHC controller */
+	esdhc_reset(regs);
+
 	mmc->priv = cfg;
 	mmc->send_cmd = esdhc_send_cmd;
 	mmc->set_ios = esdhc_set_ios;