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 <linux/mmc/boot.h> 13 #include <mach/romimage.h> 14 15 #define MMCIF_BASE (void __iomem *)0xa4ca0000 16 17 #define MSTPCR2 0xa4150038 18 #define PTWCR 0xa4050146 19 #define PTXCR 0xa4050148 20 #define PSELA 0xa405014e 21 #define PSELE 0xa4050156 22 #define HIZCRC 0xa405015c 23 #define DRVCRA 0xa405018a 24 25 /* SH7724 specific MMCIF loader 26 * 27 * loads the romImage from an MMC card starting from block 512 28 * use the following line to write the romImage to an MMC card 29 * # dd if=arch/sh/boot/romImage of=/dev/sdx bs=512 seek=512 30 */ 31 asmlinkage void mmcif_loader(unsigned char *buf, unsigned long no_bytes) 32 { 33 mmcif_update_progress(MMC_PROGRESS_ENTER); 34 35 /* enable clock to the MMCIF hardware block */ 36 __raw_writel(__raw_readl(MSTPCR2) & ~0x20000000, MSTPCR2); 37 38 /* setup pins D7-D0 */ 39 __raw_writew(0x0000, PTWCR); 40 41 /* setup pins MMC_CLK, MMC_CMD */ 42 __raw_writew(__raw_readw(PTXCR) & ~0x000f, PTXCR); 43 44 /* select D3-D0 pin function */ 45 __raw_writew(__raw_readw(PSELA) & ~0x2000, PSELA); 46 47 /* select D7-D4 pin function */ 48 __raw_writew(__raw_readw(PSELE) & ~0x3000, PSELE); 49 50 /* disable Hi-Z for the MMC pins */ 51 __raw_writew(__raw_readw(HIZCRC) & ~0x0620, HIZCRC); 52 53 /* high drive capability for MMC pins */ 54 __raw_writew(__raw_readw(DRVCRA) | 0x3000, DRVCRA); 55 56 mmcif_update_progress(MMC_PROGRESS_INIT); 57 58 /* setup MMCIF hardware */ 59 sh_mmcif_boot_init(MMCIF_BASE); 60 61 mmcif_update_progress(MMC_PROGRESS_LOAD); 62 63 /* load kernel via MMCIF interface */ 64 sh_mmcif_boot_do_read(MMCIF_BASE, 512, 65 (no_bytes + SH_MMCIF_BBS - 1) / SH_MMCIF_BBS, 66 buf); 67 68 /* disable clock to the MMCIF hardware block */ 69 __raw_writel(__raw_readl(MSTPCR2) | 0x20000000, MSTPCR2); 70 71 mmcif_update_progress(MMC_PROGRESS_DONE); 72 } 73