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kernel add
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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);
}
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