mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-12 14:23:00 +00:00
233 lines
6.3 KiB
C
233 lines
6.3 KiB
C
/*
|
|
This code was original written by Ulrich Radig and modified by
|
|
Embedded Artists AB (www.embeddedartists.com).
|
|
|
|
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 <asm/arch/hardware.h>
|
|
#include <asm/arch/spi.h>
|
|
|
|
#define MMC_Enable() PUT32(IO1CLR, 1l << 22)
|
|
#define MMC_Disable() PUT32(IO1SET, 1l << 22)
|
|
#define mmc_spi_cfg() spi_set_clock(8); spi_set_cfg(0, 1, 0);
|
|
|
|
static unsigned char Write_Command_MMC (unsigned char *CMD);
|
|
static void MMC_Read_Block(unsigned char *CMD, unsigned char *Buffer,
|
|
unsigned short int Bytes);
|
|
|
|
/* initialize the hardware */
|
|
int mmc_hw_init(void)
|
|
{
|
|
unsigned long a;
|
|
unsigned short int Timeout = 0;
|
|
unsigned char b;
|
|
unsigned char CMD[] = {0x40, 0x00, 0x00, 0x00, 0x00, 0x95};
|
|
|
|
/* set-up GPIO and SPI */
|
|
(*((volatile unsigned long *)PINSEL2)) &= ~(1l << 3); /* clear bit 3 */
|
|
(*((volatile unsigned long *)IO1DIR)) |= (1l << 22); /* set bit 22 (output) */
|
|
|
|
MMC_Disable();
|
|
|
|
spi_lock();
|
|
spi_set_clock(248);
|
|
spi_set_cfg(0, 1, 0);
|
|
MMC_Enable();
|
|
|
|
/* waste some time */
|
|
for(a=0; a < 20000; a++)
|
|
asm("nop");
|
|
|
|
/* Put the MMC/SD-card into SPI-mode */
|
|
for (b = 0; b < 10; b++) /* Sends min 74+ clocks to the MMC/SD-card */
|
|
spi_write(0xff);
|
|
|
|
/* Sends command CMD0 to MMC/SD-card */
|
|
while (Write_Command_MMC(CMD) != 1) {
|
|
if (Timeout++ > 200) {
|
|
MMC_Disable();
|
|
spi_unlock();
|
|
return(1); /* Abort with command 1 (return 1) */
|
|
}
|
|
}
|
|
/* Sends Command CMD1 an MMC/SD-card */
|
|
Timeout = 0;
|
|
CMD[0] = 0x41;/* Command 1 */
|
|
CMD[5] = 0xFF;
|
|
|
|
while (Write_Command_MMC(CMD) != 0) {
|
|
if (Timeout++ > 200) {
|
|
MMC_Disable();
|
|
spi_unlock();
|
|
return (2); /* Abort with command 2 (return 2) */
|
|
}
|
|
}
|
|
|
|
MMC_Disable();
|
|
spi_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ############################################################################
|
|
Sends a command to the MMC/SD-card
|
|
######################################################################### */
|
|
static unsigned char Write_Command_MMC (unsigned char *CMD)
|
|
{
|
|
unsigned char a, tmp = 0xff;
|
|
unsigned short int Timeout = 0;
|
|
|
|
MMC_Disable();
|
|
spi_write(0xFF);
|
|
MMC_Enable();
|
|
|
|
for (a = 0; a < 0x06; a++)
|
|
spi_write(*CMD++);
|
|
|
|
while (tmp == 0xff) {
|
|
tmp = spi_read();
|
|
if (Timeout++ > 5000)
|
|
break;
|
|
}
|
|
|
|
return (tmp);
|
|
}
|
|
|
|
/* ############################################################################
|
|
Routine to read the CID register from the MMC/SD-card (16 bytes)
|
|
######################################################################### */
|
|
void MMC_Read_Block(unsigned char *CMD, unsigned char *Buffer, unsigned short
|
|
int Bytes)
|
|
{
|
|
unsigned short int a;
|
|
|
|
spi_lock();
|
|
mmc_spi_cfg();
|
|
MMC_Enable();
|
|
|
|
if (Write_Command_MMC(CMD) != 0) {
|
|
MMC_Disable();
|
|
spi_unlock();
|
|
return;
|
|
}
|
|
|
|
while (spi_read() != 0xfe) {};
|
|
for (a = 0; a < Bytes; a++)
|
|
*Buffer++ = spi_read();
|
|
|
|
/* Read the CRC-byte */
|
|
spi_read(); /* CRC - byte is discarded */
|
|
spi_read(); /* CRC - byte is discarded */
|
|
/* set MMC_Chip_Select to high (MMC/SD-card Inaktiv) */
|
|
MMC_Disable();
|
|
spi_unlock();
|
|
|
|
return;
|
|
}
|
|
|
|
/* ############################################################################
|
|
Routine to read a block (512 bytes) from the MMC/SD-card
|
|
######################################################################### */
|
|
unsigned char mmc_read_sector (unsigned long addr,unsigned char *Buffer)
|
|
{
|
|
/* Command 16 to read aBlocks from the MMC/SD - caed */
|
|
unsigned char CMD[] = {0x51,0x00,0x00,0x00,0x00,0xFF};
|
|
|
|
/* The addres on the MMC/SD-card is in bytes,
|
|
addr is transformed from blocks to bytes and the result is
|
|
placed into the command */
|
|
|
|
addr = addr << 9; /* addr = addr * 512 */
|
|
|
|
CMD[1] = ((addr & 0xFF000000) >> 24);
|
|
CMD[2] = ((addr & 0x00FF0000) >> 16);
|
|
CMD[3] = ((addr & 0x0000FF00) >> 8 );
|
|
|
|
MMC_Read_Block(CMD, Buffer, 512);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ############################################################################
|
|
Routine to write a block (512 byte) to the MMC/SD-card
|
|
######################################################################### */
|
|
unsigned char mmc_write_sector (unsigned long addr,unsigned char *Buffer)
|
|
{
|
|
unsigned char tmp, a;
|
|
unsigned short int b;
|
|
/* Command 24 to write a block to the MMC/SD - card */
|
|
unsigned char CMD[] = {0x58, 0x00, 0x00, 0x00, 0x00, 0xFF};
|
|
|
|
/* The addres on the MMC/SD-card is in bytes,
|
|
addr is transformed from blocks to bytes and the result is
|
|
placed into the command */
|
|
|
|
addr = addr << 9; /* addr = addr * 512 */
|
|
|
|
CMD[1] = ((addr & 0xFF000000) >> 24);
|
|
CMD[2] = ((addr & 0x00FF0000) >> 16);
|
|
CMD[3] = ((addr & 0x0000FF00) >> 8 );
|
|
|
|
spi_lock();
|
|
mmc_spi_cfg();
|
|
MMC_Enable();
|
|
|
|
/* Send command CMD24 to the MMC/SD-card (Write 1 Block/512 Bytes) */
|
|
tmp = Write_Command_MMC(CMD);
|
|
if (tmp != 0) {
|
|
MMC_Disable();
|
|
spi_unlock();
|
|
return(tmp);
|
|
}
|
|
|
|
/* Do a short delay and send a clock-pulse to the MMC/SD-card */
|
|
for (a = 0; a < 100; a++)
|
|
spi_read();
|
|
|
|
/* Send a start byte to the MMC/SD-card */
|
|
spi_write(0xFE);
|
|
|
|
/* Write the block (512 bytes) to the MMC/SD-card */
|
|
for (b = 0; b < 512; b++)
|
|
spi_write(*Buffer++);
|
|
|
|
/* write the CRC-Byte */
|
|
spi_write(0xFF); /* write a dummy CRC */
|
|
spi_write(0xFF); /* CRC code is not used */
|
|
|
|
/* Wait for MMC/SD-card busy */
|
|
while (spi_read() != 0xff) {};
|
|
|
|
/* set MMC_Chip_Select to high (MMC/SD-card inactive) */
|
|
MMC_Disable();
|
|
spi_unlock();
|
|
return (0);
|
|
}
|
|
|
|
/* #########################################################################
|
|
Routine to read the CSD register from the MMC/SD-card (16 bytes)
|
|
######################################################################### */
|
|
unsigned char mmc_read_csd (unsigned char *Buffer)
|
|
{
|
|
/* Command to read the CSD register */
|
|
unsigned char CMD[] = {0x49, 0x00, 0x00, 0x00, 0x00, 0xFF};
|
|
|
|
MMC_Read_Block(CMD, Buffer, 16);
|
|
|
|
return (0);
|
|
}
|