cpu/arm720t/lpc2292/mmc.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public License as
   4  * published by the Free Software Foundation; either version 2 of
   5  * the License, or (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  15  * MA 02111-1307 USA
  16  */
  17
  18 #include <config.h>
  19 #include <common.h>
  20 #include <mmc.h>
  21 #include <asm/errno.h>
  22 #include <asm/arch/hardware.h>
  23 #include <part.h>
  24 #include <fat.h>
  25 #include "mmc_hw.h"
  26 #include <asm/arch/spi.h>
  27
  28 #ifdef CONFIG_MMC
  29
  30 #undef MMC_DEBUG
  31
  32 static block_dev_desc_t mmc_dev;
  33
  34 /* these are filled out by a call to mmc_hw_get_parameters */
  35 static int hw_size;             /* in kbytes */
  36 static int hw_nr_sects;
  37 static int hw_sect_size;        /* in bytes */
  38
  39 block_dev_desc_t * mmc_get_dev(int dev)
  40 {
  41         return (block_dev_desc_t *)(&mmc_dev);
  42 }
  43
  44 unsigned long mmc_block_read(int dev,
  45                              unsigned long start,
  46                              lbaint_t blkcnt,
  47                              void *buffer)
  48 {
  49         unsigned long rc = 0;
  50         unsigned char *p = (unsigned char *)buffer;
  51         unsigned long i;
  52         unsigned long addr = start;
  53
  54 #ifdef MMC_DEBUG
  55         printf("mmc_block_read: start=%lu, blkcnt=%lu\n", start,
  56                  (unsigned long)blkcnt);
  57 #endif
  58
  59         for(i = 0; i < (unsigned long)blkcnt; i++) {
  60 #ifdef MMC_DEBUG
  61                 printf("mmc_read_sector: addr=%lu, buffer=%p\n", addr, p);
  62 #endif
  63                 (void)mmc_read_sector(addr, p);
  64                 rc++;
  65                 addr++;
  66                 p += hw_sect_size;
  67         }
  68
  69         return rc;
  70 }
  71
  72 /*-----------------------------------------------------------------------------
  73  * Read hardware paramterers (sector size, size, number of sectors)
  74  */
  75 static int mmc_hw_get_parameters(void)
  76 {
  77         unsigned char csddata[16];
  78         unsigned int sizemult;
  79         unsigned int size;
  80
  81         mmc_read_csd(csddata);
  82         hw_sect_size = 1<<(csddata[5] & 0x0f);
  83         size = ((csddata[6]&0x03)<<10)+(csddata[7]<<2)+(csddata[8]&0xc0);
  84         sizemult = ((csddata[10] & 0x80)>>7)+((csddata[9] & 0x03)<<1);
  85         hw_nr_sects = (size+1)*(1<<(sizemult+2));
  86         hw_size = hw_nr_sects*hw_sect_size/1024;
  87
  88 #ifdef MMC_DEBUG
  89         printf("mmc_hw_get_parameters: hw_sect_size=%d, hw_nr_sects=%d, "
  90                  "hw_size=%d\n", hw_sect_size, hw_nr_sects, hw_size);
  91 #endif
  92
  93         return 0;
  94 }
  95
  96 int mmc_init(int verbose)
  97 {
  98         int ret = -ENODEV;
  99
 100         if (verbose)
 101                 printf("mmc_init\n");
 102
 103         spi_init();
 104         /* this meeds to be done twice */
 105         mmc_hw_init();
 106         udelay(1000);
 107         mmc_hw_init();
 108
 109         mmc_hw_get_parameters();
 110
 111         mmc_dev.if_type = IF_TYPE_MMC;
 112         mmc_dev.part_type = PART_TYPE_DOS;
 113         mmc_dev.dev = 0;
 114         mmc_dev.lun = 0;
 115         mmc_dev.type = 0;
 116         mmc_dev.blksz = hw_sect_size;
 117         mmc_dev.lba = hw_nr_sects;
 118         sprintf((char*)mmc_dev.vendor, "Unknown vendor");
 119         sprintf((char*)mmc_dev.product, "Unknown product");
 120         sprintf((char*)mmc_dev.revision, "N/A");
 121         mmc_dev.removable = 0;  /* should be true??? */
 122         mmc_dev.block_read = mmc_block_read;
 123
 124         fat_register_device(&mmc_dev, 1);
 125
 126         ret = 0;
 127
 128         return ret;
 129 }
 130
 131 #endif /* CONFIG_MMC */