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imx: mx6: implement mmc_get_env_dev 

Implement mmc_get_env_dev, devno can be got from smbr1 of SRC.
Introduce a weak function board_mmc_get_env_dev, different
boards can implement it according to different sdhc controllers
that used by the board.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Peng Fan 2016-01-28 16:51:26 +08:00 committed by Stefano Babic
parent 62d8cce9f3
commit 216d286c7e
1 changed files with 32 additions and 0 deletions
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32
arch/arm/cpu/armv7/mx6/soc.c
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@ -349,6 +349,38 @@ int arch_cpu_init(void)
return 0;
}
#ifdef CONFIG_ENV_IS_IN_MMC
__weak int board_mmc_get_env_dev(int devno)
{
return CONFIG_SYS_MMC_ENV_DEV;
}
int mmc_get_env_dev(void)
{
struct src *src_regs = (struct src *)SRC_BASE_ADDR;
u32 soc_sbmr = readl(&src_regs->sbmr1);
u32 bootsel;
int devno;
/*
* Refer to
* "i.MX 6Dual/6Quad Applications Processor Reference Manual"
* Chapter "8.5.3.1 Expansion Device eFUSE Configuration"
* i.MX6SL/SX/UL has same layout.
*/
bootsel = (soc_sbmr & 0x000000FF) >> 6;
/* If not boot from sd/mmc, use default value */
if (bootsel != 1)
return CONFIG_SYS_MMC_ENV_DEV;
/* BOOT_CFG2[3] and BOOT_CFG2[4] */
devno = (soc_sbmr & 0x00001800) >> 11;
return board_mmc_get_env_dev(devno);
}
#endif
int board_postclk_init(void)
{
set_ldo_voltage(LDO_SOC, 1175); /* Set VDDSOC to 1.175V */