From 5e4a6db8f428cb1f8ced74bc77241144ac0c5b1a Mon Sep 17 00:00:00 2001 From: Yangbo Lu Date: Tue, 17 Jan 2017 10:43:56 +0800 Subject: [PATCH] armv8: ls1012a: define esdhc_status_fixup for RDB board On LS1012ARDB board, three dual 1:4 mux/demux devices drive the SDHC2 signals to eMMC, SDIO wifi, SPI and Ardiuno shield. Only when we select eMMC and SDIO wifi, the SDHC2 could be used. Otherwise, the command inhibit bits of eSDHC2_PRSSTAT register will never release. This would cause below continious error messages in linux since it uses polling mode to detect card. "mmc1: Controller never released inhibit bit(s)." "mmc1: Controller never released inhibit bit(s)." "mmc1: Controller never released inhibit bit(s)." This patch is to define esdhc_status_fixup function for RDB to disable SDHC2 status if no SDIO wifi or eMMC is selected. Signed-off-by: Yangbo Lu Reviewed-by: York Sun --- board/freescale/ls1012ardb/ls1012ardb.c | 38 +++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/board/freescale/ls1012ardb/ls1012ardb.c b/board/freescale/ls1012ardb/ls1012ardb.c index 778434d684..65fa94c618 100644 --- a/board/freescale/ls1012ardb/ls1012ardb.c +++ b/board/freescale/ls1012ardb/ls1012ardb.c @@ -113,6 +113,44 @@ int board_init(void) return 0; } +int esdhc_status_fixup(void *blob, const char *compat) +{ + char esdhc0_path[] = "/soc/esdhc@1560000"; + char esdhc1_path[] = "/soc/esdhc@1580000"; + u8 io = 0; + u8 mux_sdhc2; + + do_fixup_by_path(blob, esdhc0_path, "status", "okay", + sizeof("okay"), 1); + + i2c_set_bus_num(0); + + /* + * The I2C IO-expander for mux select is used to control the muxing + * of various onboard interfaces. + * + * IO1[3:2] indicates SDHC2 interface demultiplexer select lines. + * 00 - SDIO wifi + * 01 - GPIO (to Arduino) + * 10 - eMMC Memory + * 11 - SPI + */ + if (i2c_read(I2C_MUX_IO1_ADDR, 0, 1, &io, 1) < 0) { + printf("Error reading i2c boot information!\n"); + return 0; /* Don't want to hang() on this error */ + } + + mux_sdhc2 = (io & 0x0c) >> 2; + /* Enable SDHC2 only when use SDIO wifi and eMMC */ + if (mux_sdhc2 == 2 || mux_sdhc2 == 0) + do_fixup_by_path(blob, esdhc1_path, "status", "okay", + sizeof("okay"), 1); + else + do_fixup_by_path(blob, esdhc1_path, "status", "disabled", + sizeof("disabled"), 1); + return 0; +} + int ft_board_setup(void *blob, bd_t *bd) { arch_fixup_fdt(blob);