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78 lines
2.0 KiB
78 lines
2.0 KiB
/* |
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* sh7724 MMCIF loader |
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* |
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* Copyright (C) 2010 Magnus Damm |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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#include <linux/mmc/sh_mmcif.h> |
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#include <mach/romimage.h> |
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#define MMCIF_BASE (void __iomem *)0xa4ca0000 |
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#define MSTPCR2 0xa4150038 |
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#define PTWCR 0xa4050146 |
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#define PTXCR 0xa4050148 |
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#define PSELA 0xa405014e |
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#define PSELE 0xa4050156 |
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#define HIZCRC 0xa405015c |
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#define DRVCRA 0xa405018a |
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enum { |
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MMCIF_PROGRESS_ENTER, |
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MMCIF_PROGRESS_INIT, |
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MMCIF_PROGRESS_LOAD, |
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MMCIF_PROGRESS_DONE |
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}; |
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/* SH7724 specific MMCIF loader |
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* |
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* loads the romImage from an MMC card starting from block 512 |
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* use the following line to write the romImage to an MMC card |
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* # dd if=arch/sh/boot/romImage of=/dev/sdx bs=512 seek=512 |
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*/ |
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asmlinkage void mmcif_loader(unsigned char *buf, unsigned long no_bytes) |
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{ |
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mmcif_update_progress(MMCIF_PROGRESS_ENTER); |
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/* enable clock to the MMCIF hardware block */ |
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__raw_writel(__raw_readl(MSTPCR2) & ~0x20000000, MSTPCR2); |
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/* setup pins D7-D0 */ |
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__raw_writew(0x0000, PTWCR); |
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/* setup pins MMC_CLK, MMC_CMD */ |
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__raw_writew(__raw_readw(PTXCR) & ~0x000f, PTXCR); |
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/* select D3-D0 pin function */ |
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__raw_writew(__raw_readw(PSELA) & ~0x2000, PSELA); |
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/* select D7-D4 pin function */ |
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__raw_writew(__raw_readw(PSELE) & ~0x3000, PSELE); |
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/* disable Hi-Z for the MMC pins */ |
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__raw_writew(__raw_readw(HIZCRC) & ~0x0620, HIZCRC); |
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/* high drive capability for MMC pins */ |
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__raw_writew(__raw_readw(DRVCRA) | 0x3000, DRVCRA); |
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mmcif_update_progress(MMCIF_PROGRESS_INIT); |
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/* setup MMCIF hardware */ |
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sh_mmcif_boot_init(MMCIF_BASE); |
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mmcif_update_progress(MMCIF_PROGRESS_LOAD); |
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/* load kernel via MMCIF interface */ |
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sh_mmcif_boot_do_read(MMCIF_BASE, 512, |
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(no_bytes + SH_MMCIF_BBS - 1) / SH_MMCIF_BBS, |
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buf); |
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/* disable clock to the MMCIF hardware block */ |
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__raw_writel(__raw_readl(MSTPCR2) | 0x20000000, MSTPCR2); |
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mmcif_update_progress(MMCIF_PROGRESS_DONE); |
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}
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