arch/sh/boot/romimage/mmcif-sh7724.c

   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 }