1/* 2 * sh7724 MMCIF loader 3 * 4 * Copyright (C) 2010 Magnus Damm 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11#include <linux/mmc/sh_mmcif.h> 12#include <mach/romimage.h> 13 14#define MMCIF_BASE (void __iomem *)0xa4ca0000 15 16#define MSTPCR2 0xa4150038 17#define PTWCR 0xa4050146 18#define PTXCR 0xa4050148 19#define PSELA 0xa405014e 20#define PSELE 0xa4050156 21#define HIZCRC 0xa405015c 22#define DRVCRA 0xa405018a 23 24enum { MMCIF_PROGRESS_ENTER, MMCIF_PROGRESS_INIT, 25 MMCIF_PROGRESS_LOAD, MMCIF_PROGRESS_DONE }; 26 27/* SH7724 specific MMCIF loader 28 * 29 * loads the romImage from an MMC card starting from block 512 30 * use the following line to write the romImage to an MMC card 31 * # dd if=arch/sh/boot/romImage of=/dev/sdx bs=512 seek=512 32 */ 33asmlinkage void mmcif_loader(unsigned char *buf, unsigned long no_bytes) 34{ 35 mmcif_update_progress(MMCIF_PROGRESS_ENTER); 36 37 /* enable clock to the MMCIF hardware block */ 38 __raw_writel(__raw_readl(MSTPCR2) & ~0x20000000, MSTPCR2); 39 40 /* setup pins D7-D0 */ 41 __raw_writew(0x0000, PTWCR); 42 43 /* setup pins MMC_CLK, MMC_CMD */ 44 __raw_writew(__raw_readw(PTXCR) & ~0x000f, PTXCR); 45 46 /* select D3-D0 pin function */ 47 __raw_writew(__raw_readw(PSELA) & ~0x2000, PSELA); 48 49 /* select D7-D4 pin function */ 50 __raw_writew(__raw_readw(PSELE) & ~0x3000, PSELE); 51 52 /* disable Hi-Z for the MMC pins */ 53 __raw_writew(__raw_readw(HIZCRC) & ~0x0620, HIZCRC); 54 55 /* high drive capability for MMC pins */ 56 __raw_writew(__raw_readw(DRVCRA) | 0x3000, DRVCRA); 57 58 mmcif_update_progress(MMCIF_PROGRESS_INIT); 59 60 /* setup MMCIF hardware */ 61 sh_mmcif_boot_init(MMCIF_BASE); 62 63 mmcif_update_progress(MMCIF_PROGRESS_LOAD); 64 65 /* load kernel via MMCIF interface */ 66 sh_mmcif_boot_slurp(MMCIF_BASE, buf, no_bytes); 67 68 /* disable clock to the MMCIF hardware block */ 69 __raw_writel(__raw_readl(MSTPCR2) | 0x20000000, MSTPCR2); 70 71 mmcif_update_progress(MMCIF_PROGRESS_DONE); 72} 73