Adding MMC support to beagle bone board

board_am335x_evm.c

For Kerenl porting/u-boot porting there are 3 types of files added/changed

1.cpu spefic files  [arm cortex-A8 processor]
2.Machine/architecture spefic files [AM335x ]
3.Board spefic files [Beagle bone]

Machine/Architecture spefic files are presented commonly in cpu and 
board realted files for ex.arch/arm/cpu/armv7/am335x/*.c 
[for armv7 processor --are cortex A8 and for am335x architecture spefic]

arch/arm/mach-omap2/board-am335x_evm.c having the macine spefic and 
board related information.

Here in this post we are describing about ading MMC support in the kernel 
[Normal template file is presented in earlier post]
and files changed for adding MMC support.

Patch for MMC support --One file is changed 

"arch/arm/board-am335x_evm.c"



 /* Beagle Bone has Micro-SD slot which doesn't have Write Protect pin */
   am335x_mmc[0].gpio_wp = -EINVAL;
mmc0_init();

static void mmc0_init(void)
{
        setup_pin_mux(mmc0_pin_mux);  /* For chip spefic  */
 
        omap2_hsmmc_init(am335x_mmc); /* Platform spefic for machineor arch. */
        return;
}


/* Module pin mux for mmc0 */
static struct pinmux_config mmc0_pin_mux[] = {
        {"mmc0_dat3.mmc0_dat3", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
        {"mmc0_dat2.mmc0_dat2", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
        {"mmc0_dat1.mmc0_dat1", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
        {"mmc0_dat0.mmc0_dat0", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
        {"mmc0_clk.mmc0_clk",   OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
        {"mmc0_cmd.mmc0_cmd",   OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
        {"mcasp0_aclkr.mmc0_sdwp", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT_PULLUP},
        {"spi0_cs1.mmc0_sdcd",  OMAP_MUX_MODE7 | AM33XX_PIN_INPUT_PULLUP},
        {NULL, 0},
};


/* Convert GPIO signal to GPIO pin number */
#define GPIO_TO_PIN(bank, gpio) (32 * (bank) + (gpio))

static struct omap2_hsmmc_info am335x_mmc[] __initdata = {
        {
                .mmc            = 1,
                .caps           = MMC_CAP_4_BIT_DATA,
                .gpio_cd        = GPIO_TO_PIN(0, 6),
                .gpio_wp        = GPIO_TO_PIN(3, 18),
                .ocr_mask       = MMC_VDD_32_33 | MMC_VDD_33_34, /* 3V3 */
        },
        {
                .mmc            = 0,    /* will be set at runtime */
        },
        {
                .mmc            = 0,    /* will be set at runtime */
        },
        {}      /* Terminator */
};


These changes are about adding mmc0_init () function , which calls 
setup_pin_mux(mmc0_pin_mux); and omap2_hsmmc_init(am335x_mmc); .
These two functions are added to give the corrspending support for pin muxing and adding the MMC support to platform.