89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* sh7372 MMCIF loader
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*
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* Copyright (C) 2010 Magnus Damm
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* Copyright (C) 2010 Simon Horman
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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 <linux/mmc/boot.h>
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#include <mach/mmc.h>
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#define MMCIF_BASE (void __iomem *)0xe6bd0000
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#define PORT84CR (void __iomem *)0xe6050054
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#define PORT85CR (void __iomem *)0xe6050055
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#define PORT86CR (void __iomem *)0xe6050056
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#define PORT87CR (void __iomem *)0xe6050057
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#define PORT88CR (void __iomem *)0xe6050058
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#define PORT89CR (void __iomem *)0xe6050059
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#define PORT90CR (void __iomem *)0xe605005a
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#define PORT91CR (void __iomem *)0xe605005b
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#define PORT92CR (void __iomem *)0xe605005c
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#define PORT99CR (void __iomem *)0xe6050063
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#define SMSTPCR3 (void __iomem *)0xe615013c
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/* SH7372 specific MMCIF loader
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*
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* loads the zImage from an MMC card starting from block 1.
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*
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* The image must be start with a vrl4 header and
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* the zImage must start at offset 512 of the image. That is,
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* at block 2 (=byte 1024) on the media
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*
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* Use the following line to write the vrl4 formated zImage
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* to an MMC card
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* # dd if=vrl4.out of=/dev/sdx bs=512 seek=1
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*/
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asmlinkage void mmc_loader(unsigned char *buf, unsigned long len)
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{
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mmc_init_progress();
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mmc_update_progress(MMC_PROGRESS_ENTER);
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/* Initialise MMC
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* registers: PORT84CR-PORT92CR
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* (MMCD0_0-MMCD0_7,MMCCMD0 Control)
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* value: 0x04 - select function 4
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*/
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__raw_writeb(0x04, PORT84CR);
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__raw_writeb(0x04, PORT85CR);
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__raw_writeb(0x04, PORT86CR);
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__raw_writeb(0x04, PORT87CR);
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__raw_writeb(0x04, PORT88CR);
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__raw_writeb(0x04, PORT89CR);
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__raw_writeb(0x04, PORT90CR);
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__raw_writeb(0x04, PORT91CR);
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__raw_writeb(0x04, PORT92CR);
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/* Initialise MMC
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* registers: PORT99CR (MMCCLK0 Control)
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* value: 0x10 | 0x04 - enable output | select function 4
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*/
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__raw_writeb(0x14, PORT99CR);
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/* Enable clock to MMC hardware block */
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__raw_writel(__raw_readl(SMSTPCR3) & ~(1 << 12), SMSTPCR3);
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mmc_update_progress(MMC_PROGRESS_INIT);
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/* setup MMCIF hardware */
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sh_mmcif_boot_init(MMCIF_BASE);
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mmc_update_progress(MMC_PROGRESS_LOAD);
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/* load kernel via MMCIF interface */
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sh_mmcif_boot_do_read(MMCIF_BASE, 2, /* Kernel is at block 2 */
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(len + SH_MMCIF_BBS - 1) / SH_MMCIF_BBS, buf);
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/* Disable clock to MMC hardware block */
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__raw_writel(__raw_readl(SMSTPCR3) | (1 << 12), SMSTPCR3);
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mmc_update_progress(MMC_PROGRESS_DONE);
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}
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