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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#include <common.h>
#include <mmc.h>
#include <asm/errno.h>
#include <asm/arch/hardware.h>
#include <part.h>
#include <fat.h>
#include "mmc_hw.h"
#include <asm/arch/spi.h>
#ifdef CONFIG_MMC
#undef MMC_DEBUG
static block_dev_desc_t mmc_dev;
/* these are filled out by a call to mmc_hw_get_parameters */
static int hw_size; /* in kbytes */
static int hw_nr_sects;
static int hw_sect_size; /* in bytes */
block_dev_desc_t * mmc_get_dev(int dev)
{
return (block_dev_desc_t *)(&mmc_dev);
}
unsigned long mmc_block_read(int dev,
unsigned long start,
lbaint_t blkcnt,
void *buffer)
{
unsigned long rc = 0;
unsigned char *p = (unsigned char *)buffer;
unsigned long i;
unsigned long addr = start;
#ifdef MMC_DEBUG
printf("mmc_block_read: start=%lu, blkcnt=%lu\n", start,
(unsigned long)blkcnt);
#endif
for(i = 0; i < (unsigned long)blkcnt; i++) {
#ifdef MMC_DEBUG
printf("mmc_read_sector: addr=%lu, buffer=%p\n", addr, p);
#endif
(void)mmc_read_sector(addr, p);
rc++;
addr++;
p += hw_sect_size;
}
return rc;
}
/*-----------------------------------------------------------------------------
* Read hardware paramterers (sector size, size, number of sectors)
*/
static int mmc_hw_get_parameters(void)
{
unsigned char csddata[16];
unsigned int sizemult;
unsigned int size;
mmc_read_csd(csddata);
hw_sect_size = 1<<(csddata[5] & 0x0f);
size = ((csddata[6]&0x03)<<10)+(csddata[7]<<2)+(csddata[8]&0xc0);
sizemult = ((csddata[10] & 0x80)>>7)+((csddata[9] & 0x03)<<1);
hw_nr_sects = (size+1)*(1<<(sizemult+2));
hw_size = hw_nr_sects*hw_sect_size/1024;
#ifdef MMC_DEBUG
printf("mmc_hw_get_parameters: hw_sect_size=%d, hw_nr_sects=%d, "
"hw_size=%d\n", hw_sect_size, hw_nr_sects, hw_size);
#endif
return 0;
}
int mmc_init(int verbose)
{
int ret = -ENODEV;
if (verbose)
printf("mmc_init\n");
spi_init();
/* this meeds to be done twice */
mmc_hw_init();
udelay(1000);
mmc_hw_init();
mmc_hw_get_parameters();
mmc_dev.if_type = IF_TYPE_MMC;
mmc_dev.part_type = PART_TYPE_DOS;
mmc_dev.dev = 0;
mmc_dev.lun = 0;
mmc_dev.type = 0;
mmc_dev.blksz = hw_sect_size;
mmc_dev.lba = hw_nr_sects;
sprintf((char*)mmc_dev.vendor, "Unknown vendor");
sprintf((char*)mmc_dev.product, "Unknown product");
sprintf((char*)mmc_dev.revision, "N/A");
mmc_dev.removable = 0; /* should be true??? */
mmc_dev.block_read = mmc_block_read;
fat_register_device(&mmc_dev, 1);
ret = 0;
return ret;
}
#endif /* CONFIG_MMC */
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