mmc: fsl_esdhc: Poll until card is not busy anymore

This patch imports parts of two patches from the Freescale U-Boot with the following
commit messages:

ENGR00156405 ESDHC: Add workaround for auto-clock gate errata ENGcm03648
http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/commit/drivers/mmc/imx_esdhc.c?h=imx_v2009.08_12.01.01&id=e436525a70fe47623d346bc7d9f08f12ff8ad787
The errata, not applicable to USDHC, causes ESDHC to shut off clock to the card
when auto-clock gating is enabled for commands with busy signalling and no data
phase. The card might require the clock to exit the busy state, so the workaround
is to disable the auto-clock gate bits in SYSCTL register for such commands. The
workaround also entails polling on DAT0 bit in the PRSSTAT register to learn when
busy state is complete. Auto-clock gating is re-enabled at the end of busy state.

ENGR00156670-1 ESDHC/USDHC: Remove delay before each cmd and some bug fixes
http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/commit/drivers/mmc/imx_esdhc.c?h=imx_v2009.08_12.01.01&id=a77c6fec8596891be96b2cdbc742c9824844b92a
Removed delay of 10 ms before each command. There should not be a need to have this
delay after the ENGR00156405 patch that polls until card is not busy anymore before
proceeding to next cmd.

This patch imports the polling part of both patches. The auto-clock gating code
don't apply for i.MX6 as implemented in these two patches.

SYSCTL_RSTA was defined twice. Remove one definition.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
CC: Andy Fleming <afleming@freescale.com>
CC: Fabio Estevam <fabio.estevam@freescale.com>
CC: Stefano Babic <sbabic@denx.de>

1 files changed, 38 insertions, 1 deletions

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index a2f35e3..07370b5 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -307,19 +307,56 @@ esdhc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 #else
 	esdhc_write32(&regs->xfertyp, xfertyp);
 #endif
+
+	/* Mask all irqs */
+	esdhc_write32(&regs->irqsigen, 0);
+
 	/* Wait for the command to complete */
-	while (!(esdhc_read32(&regs->irqstat) & IRQSTAT_CC))
+	while (!(esdhc_read32(&regs->irqstat) & (IRQSTAT_CC | IRQSTAT_CTOE)))
 		;
 
 	irqstat = esdhc_read32(&regs->irqstat);
 	esdhc_write32(&regs->irqstat, irqstat);
 
+	/* Reset CMD and DATA portions on error */
+	if (irqstat & (CMD_ERR | IRQSTAT_CTOE)) {
+		esdhc_write32(&regs->sysctl, esdhc_read32(&regs->sysctl) |
+			      SYSCTL_RSTC);
+		while (esdhc_read32(&regs->sysctl) & SYSCTL_RSTC)
+			;
+
+		if (data) {
+			esdhc_write32(&regs->sysctl,
+				      esdhc_read32(&regs->sysctl) |
+				      SYSCTL_RSTD);
+			while ((esdhc_read32(&regs->sysctl) & SYSCTL_RSTD))
+				;
+		}
+	}
+
 	if (irqstat & CMD_ERR)
 		return COMM_ERR;
 
 	if (irqstat & IRQSTAT_CTOE)
 		return TIMEOUT;
 
+	/* Workaround for ESDHC errata ENGcm03648 */
+	if (!data && (cmd->resp_type & MMC_RSP_BUSY)) {
+		int timeout = 2500;
+
+		/* Poll on DATA0 line for cmd with busy signal for 250 ms */
+		while (timeout > 0 && !(esdhc_read32(&regs->prsstat) &
+					PRSSTAT_DAT0)) {
+			udelay(100);
+			timeout--;
+		}
+
+		if (timeout <= 0) {
+			printf("Timeout waiting for DAT0 to go high!\n");
+			return TIMEOUT;
+		}
+	}
+
 	/* Copy the response to the response buffer */
 	if (cmd->resp_type & MMC_RSP_136) {
 		u32 cmdrsp3, cmdrsp2, cmdrsp1, cmdrsp0;