mmcif-sh7724.c

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/*
 * sh7724 MMCIF loader
 *
 * Copyright (C) 2010 Magnus Damm
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/mmc/sh_mmcif.h>
#include <linux/mmc/boot.h>
#include <mach/romimage.h>

#define MMCIF_BASE      (void __iomem *)0xa4ca0000

#define MSTPCR2     0xa4150038
#define PTWCR       0xa4050146
#define PTXCR       0xa4050148
#define PSELA       0xa405014e
#define PSELE       0xa4050156
#define HIZCRC      0xa405015c
#define DRVCRA      0xa405018a

/* SH7724 specific MMCIF loader
 *
 * loads the romImage from an MMC card starting from block 512
 * use the following line to write the romImage to an MMC card
 * # dd if=arch/sh/boot/romImage of=/dev/sdx bs=512 seek=512
 */
asmlinkage void mmcif_loader(unsigned char *buf, unsigned long no_bytes)
{
    mmcif_update_progress(MMC_PROGRESS_ENTER);

    /* enable clock to the MMCIF hardware block */
    __raw_writel(__raw_readl(MSTPCR2) & ~0x20000000, MSTPCR2);

    /* setup pins D7-D0 */
    __raw_writew(0x0000, PTWCR);

    /* setup pins MMC_CLK, MMC_CMD */
    __raw_writew(__raw_readw(PTXCR) & ~0x000f, PTXCR);

    /* select D3-D0 pin function */
    __raw_writew(__raw_readw(PSELA) & ~0x2000, PSELA);

    /* select D7-D4 pin function */
    __raw_writew(__raw_readw(PSELE) & ~0x3000, PSELE);

    /* disable Hi-Z for the MMC pins */
    __raw_writew(__raw_readw(HIZCRC) & ~0x0620, HIZCRC);

    /* high drive capability for MMC pins */
    __raw_writew(__raw_readw(DRVCRA) | 0x3000, DRVCRA);

    mmcif_update_progress(MMC_PROGRESS_INIT);

    /* setup MMCIF hardware */
    sh_mmcif_boot_init(MMCIF_BASE);

    mmcif_update_progress(MMC_PROGRESS_LOAD);

    /* load kernel via MMCIF interface */
    sh_mmcif_boot_do_read(MMCIF_BASE, 512,
                          (no_bytes + SH_MMCIF_BBS - 1) / SH_MMCIF_BBS,
                  buf);

    /* disable clock to the MMCIF hardware block */
    __raw_writel(__raw_readl(MSTPCR2) | 0x20000000, MSTPCR2);

    mmcif_update_progress(MMC_PROGRESS_DONE);
}