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authorOtavio Salvador <otavio@ossystems.com.br>2015-02-17 10:42:43 -0200
committerStefano Babic <sbabic@denx.de>2015-02-23 09:11:42 +0100
commitf022d36e8a4517b2a9d25ff2d75bd2459d0c68b1 (patch)
treed6392276bbb01583c859847d023fda1deb812c4d
parentaf38bf6b38eab53343afda2ad124682b27d82e64 (diff)
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mmc: fsl_esdhc: Add CMD11 support to switch to 1.8V
This adds support to switch to 1.8V in case CMD11 succeeds. Signed-off-by: Otavio Salvador <otavio@ossystems.com.br> Reviewed-by: Marek Vasut <marex@denx.de>
-rw-r--r--drivers/mmc/fsl_esdhc.c29
-rw-r--r--include/fsl_esdhc.h2
-rw-r--r--include/mmc.h1
3 files changed, 25 insertions, 7 deletions
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index c55eb28..6a3e147 100644
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -54,19 +54,21 @@ struct fsl_esdhc {
uint fevt; /* Force event register */
uint admaes; /* ADMA error status register */
uint adsaddr; /* ADMA system address register */
- char reserved2[160]; /* reserved */
+ char reserved2[100]; /* reserved */
+ uint vendorspec; /* Vendor Specific register */
+ char reserved3[59]; /* reserved */
uint hostver; /* Host controller version register */
- char reserved3[4]; /* reserved */
- uint dmaerraddr; /* DMA error address register */
char reserved4[4]; /* reserved */
- uint dmaerrattr; /* DMA error attribute register */
+ uint dmaerraddr; /* DMA error address register */
char reserved5[4]; /* reserved */
+ uint dmaerrattr; /* DMA error attribute register */
+ char reserved6[4]; /* reserved */
uint hostcapblt2; /* Host controller capabilities register 2 */
- char reserved6[8]; /* reserved */
+ char reserved7[8]; /* reserved */
uint tcr; /* Tuning control register */
- char reserved7[28]; /* reserved */
+ char reserved8[28]; /* reserved */
uint sddirctl; /* SD direction control register */
- char reserved8[712]; /* reserved */
+ char reserved9[712]; /* reserved */
uint scr; /* eSDHC control register */
};
@@ -341,6 +343,15 @@ esdhc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
goto out;
}
+ /* Switch voltage to 1.8V if CMD11 succeeded */
+ if (cmd->cmdidx == SD_CMD_SWITCH_UHS18V) {
+ esdhc_setbits32(&regs->vendorspec, ESDHC_VENDORSPEC_VSELECT);
+
+ printf("Run CMD11 1.8V switch\n");
+ /* Sleep for 5 ms - max time for card to switch to 1.8V */
+ udelay(5000);
+ }
+
/* Workaround for ESDHC errata ENGcm03648 */
if (!data && (cmd->resp_type & MMC_RSP_BUSY)) {
int timeout = 2500;
@@ -413,6 +424,10 @@ out:
while ((esdhc_read32(&regs->sysctl) & SYSCTL_RSTD))
;
}
+
+ /* If this was CMD11, then notify that power cycle is needed */
+ if (cmd->cmdidx == SD_CMD_SWITCH_UHS18V)
+ printf("CMD11 to switch to 1.8V mode failed, card requires power cycle.\n");
}
esdhc_write32(&regs->irqstat, -1);
diff --git a/include/fsl_esdhc.h b/include/fsl_esdhc.h
index c1b6648..e3d6581 100644
--- a/include/fsl_esdhc.h
+++ b/include/fsl_esdhc.h
@@ -154,6 +154,8 @@
#define ESDHC_HOSTCAPBLT_DMAS 0x00400000
#define ESDHC_HOSTCAPBLT_HSS 0x00200000
+#define ESDHC_VENDORSPEC_VSELECT 0x00000002 /* Use 1.8V */
+
struct fsl_esdhc_cfg {
u32 esdhc_base;
u32 sdhc_clk;
diff --git a/include/mmc.h b/include/mmc.h
index 56d97bb..e4b071e 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -88,6 +88,7 @@
#define SD_CMD_SEND_RELATIVE_ADDR 3
#define SD_CMD_SWITCH_FUNC 6
#define SD_CMD_SEND_IF_COND 8
+#define SD_CMD_SWITCH_UHS18V 11
#define SD_CMD_APP_SET_BUS_WIDTH 6
#define SD_CMD_ERASE_WR_BLK_START 32