[U-Boot] [PATCH v2 3/5] sunxi: When we've both mmc0 and mmc2, detect from which one we're booting

Hans de Goede
2014-10-06T17:57:43Z

sunxi SOCs can boot from both mmc0 and mmc2, detect from which one we're
booting, and make that one "mmc dev 0" so that a single u-boot binary can
be used for both the onboard eMMC and for external sdcards.

When we're booting from mmc2, we make it dev 0 because that is where the SPL
will load the tertiary payload (the actual u-boot binary in our case) from,
see: common/spl/spl_mmc.c, which has dev 0 hardcoded everywhere.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
arch/arm/include/asm/arch-sunxi/mmc.h | 2 +-
board/sunxi/board.c | 25 +++++++++++++++++++++++--
drivers/mmc/sunxi_mmc.c | 7 ++-----
3 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/arch-sunxi/mmc.h b/arch/arm/include/asm/arch-sunxi/mmc.h
index 53196e3..ff2602d 100644
--- a/arch/arm/include/asm/arch-sunxi/mmc.h
+++ b/arch/arm/include/asm/arch-sunxi/mmc.h
@@ -120,5 +120,5 @@ struct sunxi_mmc {
#define SUNXI_MMC_IDIE_TXIRQ (0x1 << 0)
#define SUNXI_MMC_IDIE_RXIRQ (0x1 << 1)

-int sunxi_mmc_init(int sdc_no);
+struct mmc *sunxi_mmc_init(int sdc_no);
#endif /* _SUNXI_MMC_H */
diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index 4d602ca..0a7be31 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -12,6 +12,7 @@
*/

#include <common.h>
+#include <mmc.h>
#ifdef CONFIG_AXP152_POWER
#include <axp152.h>
#endif
@@ -108,11 +109,31 @@ static void mmc_pinmux_setup(int sdc)

int board_mmc_init(bd_t *bis)
{
+ __maybe_unused struct mmc *mmc0, *mmc1;
+ __maybe_unused char buf[512];
+
mmc_pinmux_setup(CONFIG_MMC_SUNXI_SLOT);
- sunxi_mmc_init(CONFIG_MMC_SUNXI_SLOT);
+ mmc0 = sunxi_mmc_init(CONFIG_MMC_SUNXI_SLOT);
#if CONFIG_MMC_SUNXI_SLOT_EXTRA != -1
mmc_pinmux_setup(CONFIG_MMC_SUNXI_SLOT_EXTRA);
- sunxi_mmc_init(CONFIG_MMC_SUNXI_SLOT_EXTRA);
+ mmc1 = sunxi_mmc_init(CONFIG_MMC_SUNXI_SLOT_EXTRA);
+#endif
+
+#if CONFIG_MMC_SUNXI_SLOT == 0 && CONFIG_MMC_SUNXI_SLOT_EXTRA == 2
+ /*
+ * Both mmc0 and mmc2 are bootable, figure out where we're booting
+ * from. Try mmc0 first, just like the brom does.
+ */
+ if (mmc_getcd(mmc0) && mmc_init(mmc0) == 0 &&
+ mmc0->block_dev.block_read(0, 16, 1, buf) == 1) {
+ buf[12] = 0;
+ if (strcmp(&buf[4], "eGON.BT0") == 0)
+ return 0;
+ }
+
+ /* no bootable card in mmc0, so we must be booting from mmc2, swap */
+ mmc0->block_dev.dev = 1;
+ mmc1->block_dev.dev = 0;
#endif

return 0;
diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
index 0ea9f4d..7526540 100644
--- a/drivers/mmc/sunxi_mmc.c
+++ b/drivers/mmc/sunxi_mmc.c
@@ -370,7 +370,7 @@ static const struct mmc_ops sunxi_mmc_ops = {
.getcd = sunxi_mmc_getcd,
};

-int sunxi_mmc_init(int sdc_no)
+struct mmc *sunxi_mmc_init(int sdc_no)
{
struct mmc_config *cfg = &mmc_host[sdc_no].cfg;

@@ -393,8 +393,5 @@ int sunxi_mmc_init(int sdc_no)
mmc_resource_init(sdc_no);
mmc_clk_io_on(sdc_no);

- if (mmc_create(cfg, &mmc_host[sdc_no]) == NULL)
- return -1;
-
- return 0;
+ return mmc_create(cfg, &mmc_host[sdc_no]);
}
--
2.1.0