arch/arm/boot/compressed/sdhi-sh7372.c

   1 /*
   2  * SuperH Mobile SDHI
   3  *
   4  * Copyright (C) 2010 Magnus Damm
   5  * Copyright (C) 2010 Kuninori Morimoto
   6  * Copyright (C) 2010 Simon Horman
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  *
  12  * Parts inspired by u-boot
  13  */
  14
  15 #include <linux/io.h>
  16 #include <mach/mmc.h>
  17 #include <linux/mmc/boot.h>
  18 #include <linux/mmc/tmio.h>
  19
  20 #include "sdhi-shmobile.h"
  21
  22 #define PORT179CR       0xe60520b3
  23 #define PORT180CR       0xe60520b4
  24 #define PORT181CR       0xe60520b5
  25 #define PORT182CR       0xe60520b6
  26 #define PORT183CR       0xe60520b7
  27 #define PORT184CR       0xe60520b8
  28
  29 #define SMSTPCR3        0xe615013c
  30
  31 #define CR_INPUT_ENABLE 0x10
  32 #define CR_FUNCTION1    0x01
  33
  34 #define SDHI1_BASE      (void __iomem *)0xe6860000
  35 #define SDHI_BASE       SDHI1_BASE
  36
  37 /*  SuperH Mobile SDHI loader
  38  *
  39  * loads the zImage from an SD card starting from block 0
  40  * on physical partition 1
  41  *
  42  * The image must be start with a vrl4 header and
  43  * the zImage must start at offset 512 of the image. That is,
  44  * at block 1 (=byte 512) of physical partition 1
  45  *
  46  * Use the following line to write the vrl4 formated zImage
  47  * to an SD card
  48  * # dd if=vrl4.out of=/dev/sdx bs=512
  49  */
  50 asmlinkage void mmc_loader(unsigned short *buf, unsigned long len)
  51 {
  52         int high_capacity;
  53
  54         mmc_init_progress();
  55
  56         mmc_update_progress(MMC_PROGRESS_ENTER);
  57         /* Initialise SDHI1 */
  58         /* PORT184CR: GPIO_FN_SDHICMD1 Control */
  59         __raw_writeb(CR_FUNCTION1, PORT184CR);
  60         /* PORT179CR: GPIO_FN_SDHICLK1 Control */
  61         __raw_writeb(CR_INPUT_ENABLE|CR_FUNCTION1, PORT179CR);
  62         /* PORT181CR: GPIO_FN_SDHID1_3 Control */
  63         __raw_writeb(CR_FUNCTION1, PORT183CR);
  64         /* PORT182CR: GPIO_FN_SDHID1_2 Control */
  65         __raw_writeb(CR_FUNCTION1, PORT182CR);
  66         /* PORT183CR: GPIO_FN_SDHID1_1 Control */
  67         __raw_writeb(CR_FUNCTION1, PORT181CR);
  68         /* PORT180CR: GPIO_FN_SDHID1_0 Control */
  69         __raw_writeb(CR_FUNCTION1, PORT180CR);
  70
  71         /* Enable clock to SDHI1 hardware block */
  72         __raw_writel(__raw_readl(SMSTPCR3) & ~(1 << 13), SMSTPCR3);
  73
  74         /* setup SDHI hardware */
  75         mmc_update_progress(MMC_PROGRESS_INIT);
  76         high_capacity = sdhi_boot_init(SDHI_BASE);
  77         if (high_capacity < 0)
  78                 goto err;
  79
  80         mmc_update_progress(MMC_PROGRESS_LOAD);
  81         /* load kernel */
  82         if (sdhi_boot_do_read(SDHI_BASE, high_capacity,
  83                               0, /* Kernel is at block 1 */
  84                               (len + TMIO_BBS - 1) / TMIO_BBS, buf))
  85                 goto err;
  86
  87         /* Disable clock to SDHI1 hardware block */
  88         __raw_writel(__raw_readl(SMSTPCR3) | (1 << 13), SMSTPCR3);
  89
  90         mmc_update_progress(MMC_PROGRESS_DONE);
  91
  92         return;
  93 err:
  94         for(;;);
  95 }