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mmc: refactor MMC startup to make it easier to support new modes

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The MMC startup process currently handles 4 modes. To make it easier to
add support for more modes, let's make the process more generic and use a
list of the modes to try.
The major functional change is that when a mode fails we try the next one.
Not all modes are tried, only those supported by the card and the host.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jean-Jacques Hiblot
2017-09-21 16:29:58 +02:00
committed by Jaehoon Chung
parent d0c221fe73
commit 3862b85474
2 changed files with 162 additions and 98 deletions
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11
include/mmc.h
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@@ -215,7 +215,10 @@
#define EXT_CSD_BUS_WIDTH_8 2 /* Card is in 8 bit mode */
#define EXT_CSD_DDR_BUS_WIDTH_4 5 /* Card is in 4 bit DDR mode */
#define EXT_CSD_DDR_BUS_WIDTH_8 6 /* Card is in 8 bit DDR mode */
#define EXT_CSD_DDR_FLAG BIT(2) /* Flag for DDR mode */
#define EXT_CSD_TIMING_LEGACY 0 /* no high speed */
#define EXT_CSD_TIMING_HS 1 /* HS */
#define EXT_CSD_BOOT_ACK_ENABLE (1 << 6)
#define EXT_CSD_BOOT_PARTITION_ENABLE (1 << 3)
#define EXT_CSD_PARTITION_ACCESS_ENABLE (1 << 0)
@@ -429,6 +432,14 @@ enum bus_mode {
const char *mmc_mode_name(enum bus_mode mode);
void mmc_dump_capabilities(const char *text, uint caps);
static inline bool mmc_is_mode_ddr(enum bus_mode mode)
{
if ((mode == MMC_DDR_52) || (mode == UHS_DDR50))
return true;
else
return false;
}
/*
* With CONFIG_DM_MMC enabled, struct mmc can be accessed from the MMC device
* with mmc_get_mmc_dev().