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Ole André Vadla Ravnås 2022-05-07 01:01:45 +02:00
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arch/arm/boot/compressed/mmcif-sh7372.c Normal file
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/*
* sh7372 MMCIF loader
*
* Copyright (C) 2010 Magnus Damm
* Copyright (C) 2010 Simon Horman
*
* 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/mmc.h>
#define MMCIF_BASE (void __iomem *)0xe6bd0000
#define PORT84CR (void __iomem *)0xe6050054
#define PORT85CR (void __iomem *)0xe6050055
#define PORT86CR (void __iomem *)0xe6050056
#define PORT87CR (void __iomem *)0xe6050057
#define PORT88CR (void __iomem *)0xe6050058
#define PORT89CR (void __iomem *)0xe6050059
#define PORT90CR (void __iomem *)0xe605005a
#define PORT91CR (void __iomem *)0xe605005b
#define PORT92CR (void __iomem *)0xe605005c
#define PORT99CR (void __iomem *)0xe6050063
#define SMSTPCR3 (void __iomem *)0xe615013c
/* SH7372 specific MMCIF loader
*
* loads the zImage from an MMC card starting from block 1.
*
* The image must be start with a vrl4 header and
* the zImage must start at offset 512 of the image. That is,
* at block 2 (=byte 1024) on the media
*
* Use the following line to write the vrl4 formated zImage
* to an MMC card
* # dd if=vrl4.out of=/dev/sdx bs=512 seek=1
*/
asmlinkage void mmc_loader(unsigned char *buf, unsigned long len)
{
mmc_init_progress();
mmc_update_progress(MMC_PROGRESS_ENTER);
/* Initialise MMC
* registers: PORT84CR-PORT92CR
* (MMCD0_0-MMCD0_7,MMCCMD0 Control)
* value: 0x04 - select function 4
*/
__raw_writeb(0x04, PORT84CR);
__raw_writeb(0x04, PORT85CR);
__raw_writeb(0x04, PORT86CR);
__raw_writeb(0x04, PORT87CR);
__raw_writeb(0x04, PORT88CR);
__raw_writeb(0x04, PORT89CR);
__raw_writeb(0x04, PORT90CR);
__raw_writeb(0x04, PORT91CR);
__raw_writeb(0x04, PORT92CR);
/* Initialise MMC
* registers: PORT99CR (MMCCLK0 Control)
* value: 0x10 | 0x04 - enable output | select function 4
*/
__raw_writeb(0x14, PORT99CR);
/* Enable clock to MMC hardware block */
__raw_writel(__raw_readl(SMSTPCR3) & ~(1 << 12), SMSTPCR3);
mmc_update_progress(MMC_PROGRESS_INIT);
/* setup MMCIF hardware */
sh_mmcif_boot_init(MMCIF_BASE);
mmc_update_progress(MMC_PROGRESS_LOAD);
/* load kernel via MMCIF interface */
sh_mmcif_boot_do_read(MMCIF_BASE, 2, /* Kernel is at block 2 */
(len + SH_MMCIF_BBS - 1) / SH_MMCIF_BBS, buf);
/* Disable clock to MMC hardware block */
__raw_writel(__raw_readl(SMSTPCR3) | (1 << 12), SMSTPCR3);
mmc_update_progress(MMC_PROGRESS_DONE);
}