This adds support to switch to 1.8V in case CMD11 succeeds.
Signed-off-by: Otavio Salvador otavio@ossystems.com.br ---
drivers/mmc/fsl_esdhc.c | 30 +++++++++++++++++++++++------- include/fsl_esdhc.h | 2 ++ include/mmc.h | 1 + 3 files changed, 26 insertions(+), 7 deletions(-)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index c55eb28..eb0fbf9 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(®s->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 +424,11 @@ out: while ((esdhc_read32(®s->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(®s->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