tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * sh7372 MMCIF loader
3 *
4 * Copyright (C) 2010 Magnus Damm
5 * Copyright (C) 2010 Simon Horman
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
9 * for more details.
10 */
11
12#include <linux/mmc/sh_mmcif.h>
13#include <linux/mmc/boot.h>
14#include <mach/mmc.h>
15
16#define MMCIF_BASE (void __iomem *)0xe6bd0000
17
18#define PORT84CR (void __iomem *)0xe6050054
19#define PORT85CR (void __iomem *)0xe6050055
20#define PORT86CR (void __iomem *)0xe6050056
21#define PORT87CR (void __iomem *)0xe6050057
22#define PORT88CR (void __iomem *)0xe6050058
23#define PORT89CR (void __iomem *)0xe6050059
24#define PORT90CR (void __iomem *)0xe605005a
25#define PORT91CR (void __iomem *)0xe605005b
26#define PORT92CR (void __iomem *)0xe605005c
27#define PORT99CR (void __iomem *)0xe6050063
28
29#define SMSTPCR3 (void __iomem *)0xe615013c
30
31/* SH7372 specific MMCIF loader
32 *
33 * loads the zImage from an MMC card starting from block 1.
34 *
35 * The image must be start with a vrl4 header and
36 * the zImage must start at offset 512 of the image. That is,
37 * at block 2 (=byte 1024) on the media
38 *
39 * Use the following line to write the vrl4 formated zImage
40 * to an MMC card
41 * # dd if=vrl4.out of=/dev/sdx bs=512 seek=1
42 */
43asmlinkage void mmc_loader(unsigned char *buf, unsigned long len)
44{
45 mmc_init_progress();
46 mmc_update_progress(MMC_PROGRESS_ENTER);
47
48 /* Initialise MMC
49 * registers: PORT84CR-PORT92CR
50 * (MMCD0_0-MMCD0_7,MMCCMD0 Control)
51 * value: 0x04 - select function 4
52 */
53 __raw_writeb(0x04, PORT84CR);
54 __raw_writeb(0x04, PORT85CR);
55 __raw_writeb(0x04, PORT86CR);
56 __raw_writeb(0x04, PORT87CR);
57 __raw_writeb(0x04, PORT88CR);
58 __raw_writeb(0x04, PORT89CR);
59 __raw_writeb(0x04, PORT90CR);
60 __raw_writeb(0x04, PORT91CR);
61 __raw_writeb(0x04, PORT92CR);
62
63 /* Initialise MMC
64 * registers: PORT99CR (MMCCLK0 Control)
65 * value: 0x10 | 0x04 - enable output | select function 4
66 */
67 __raw_writeb(0x14, PORT99CR);
68
69 /* Enable clock to MMC hardware block */
70 __raw_writel(__raw_readl(SMSTPCR3) & ~(1 << 12), SMSTPCR3);
71
72 mmc_update_progress(MMC_PROGRESS_INIT);
73
74 /* setup MMCIF hardware */
75 sh_mmcif_boot_init(MMCIF_BASE);
76
77 mmc_update_progress(MMC_PROGRESS_LOAD);
78
79 /* load kernel via MMCIF interface */
80 sh_mmcif_boot_do_read(MMCIF_BASE, 2, /* Kernel is at block 2 */
81 (len + SH_MMCIF_BBS - 1) / SH_MMCIF_BBS, buf);
82
83
84 /* Disable clock to MMC hardware block */
85 __raw_writel(__raw_readl(SMSTPCR3) | (1 << 12), SMSTPCR3);
86
87 mmc_update_progress(MMC_PROGRESS_DONE);
88}