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234 lines
6.3 KiB
C
234 lines
6.3 KiB
C
/*
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This code was original written by Ulrich Radig and modified by
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Embedded Artists AB (www.embeddedartists.com).
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <config.h>
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#include <common.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/spi.h>
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#define MMC_Enable() PUT32(IO1CLR, 1l << 22)
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#define MMC_Disable() PUT32(IO1SET, 1l << 22)
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#define mmc_spi_cfg() spi_set_clock(8); spi_set_cfg(0, 1, 0);
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static unsigned char Write_Command_MMC (unsigned char *CMD);
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static void MMC_Read_Block(unsigned char *CMD, unsigned char *Buffer,
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unsigned short int Bytes);
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/* initialize the hardware */
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int mmc_hw_init(void)
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{
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unsigned long a;
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unsigned short int Timeout = 0;
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unsigned char b;
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unsigned char CMD[] = {0x40, 0x00, 0x00, 0x00, 0x00, 0x95};
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/* set-up GPIO and SPI */
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(*((volatile unsigned long *)PINSEL2)) &= ~(1l << 3); /* clear bit 3 */
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(*((volatile unsigned long *)IO1DIR)) |= (1l << 22); /* set bit 22 (output) */
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MMC_Disable();
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spi_lock();
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spi_set_clock(248);
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spi_set_cfg(0, 1, 0);
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MMC_Enable();
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/* waste some time */
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for(a=0; a < 20000; a++)
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asm("nop");
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/* Put the MMC/SD-card into SPI-mode */
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for (b = 0; b < 10; b++) /* Sends min 74+ clocks to the MMC/SD-card */
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spi_write(0xff);
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/* Sends command CMD0 to MMC/SD-card */
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while (Write_Command_MMC(CMD) != 1) {
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if (Timeout++ > 200) {
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MMC_Disable();
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spi_unlock();
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return(1); /* Abort with command 1 (return 1) */
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}
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}
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/* Sends Command CMD1 an MMC/SD-card */
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Timeout = 0;
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CMD[0] = 0x41;/* Command 1 */
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CMD[5] = 0xFF;
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while (Write_Command_MMC(CMD) != 0) {
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if (Timeout++ > 200) {
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MMC_Disable();
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spi_unlock();
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return (2); /* Abort with command 2 (return 2) */
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}
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}
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MMC_Disable();
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spi_unlock();
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return 0;
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}
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/* ############################################################################
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Sends a command to the MMC/SD-card
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######################################################################### */
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static unsigned char Write_Command_MMC (unsigned char *CMD)
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{
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unsigned char a, tmp = 0xff;
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unsigned short int Timeout = 0;
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MMC_Disable();
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spi_write(0xFF);
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MMC_Enable();
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for (a = 0; a < 0x06; a++)
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spi_write(*CMD++);
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while (tmp == 0xff) {
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tmp = spi_read();
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if (Timeout++ > 5000)
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break;
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}
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return (tmp);
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}
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/* ############################################################################
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Routine to read the CID register from the MMC/SD-card (16 bytes)
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######################################################################### */
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void MMC_Read_Block(unsigned char *CMD, unsigned char *Buffer, unsigned short
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int Bytes)
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{
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unsigned short int a;
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spi_lock();
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mmc_spi_cfg();
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MMC_Enable();
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if (Write_Command_MMC(CMD) != 0) {
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MMC_Disable();
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spi_unlock();
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return;
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}
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while (spi_read() != 0xfe) {};
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for (a = 0; a < Bytes; a++)
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*Buffer++ = spi_read();
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/* Read the CRC-byte */
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spi_read(); /* CRC - byte is discarded */
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spi_read(); /* CRC - byte is discarded */
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/* set MMC_Chip_Select to high (MMC/SD-card Inaktiv) */
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MMC_Disable();
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spi_unlock();
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return;
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}
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/* ############################################################################
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Routine to read a block (512 bytes) from the MMC/SD-card
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######################################################################### */
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unsigned char mmc_read_sector (unsigned long addr,unsigned char *Buffer)
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{
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/* Command 16 to read aBlocks from the MMC/SD - caed */
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unsigned char CMD[] = {0x51,0x00,0x00,0x00,0x00,0xFF};
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/* The addres on the MMC/SD-card is in bytes,
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addr is transformed from blocks to bytes and the result is
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placed into the command */
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addr = addr << 9; /* addr = addr * 512 */
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CMD[1] = ((addr & 0xFF000000) >> 24);
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CMD[2] = ((addr & 0x00FF0000) >> 16);
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CMD[3] = ((addr & 0x0000FF00) >> 8 );
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MMC_Read_Block(CMD, Buffer, 512);
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return (0);
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}
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/* ############################################################################
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Routine to write a block (512 byte) to the MMC/SD-card
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######################################################################### */
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unsigned char mmc_write_sector (unsigned long addr,unsigned char *Buffer)
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{
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unsigned char tmp, a;
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unsigned short int b;
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/* Command 24 to write a block to the MMC/SD - card */
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unsigned char CMD[] = {0x58, 0x00, 0x00, 0x00, 0x00, 0xFF};
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/* The addres on the MMC/SD-card is in bytes,
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addr is transformed from blocks to bytes and the result is
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placed into the command */
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addr = addr << 9; /* addr = addr * 512 */
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CMD[1] = ((addr & 0xFF000000) >> 24);
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CMD[2] = ((addr & 0x00FF0000) >> 16);
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CMD[3] = ((addr & 0x0000FF00) >> 8 );
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spi_lock();
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mmc_spi_cfg();
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MMC_Enable();
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/* Send command CMD24 to the MMC/SD-card (Write 1 Block/512 Bytes) */
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tmp = Write_Command_MMC(CMD);
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if (tmp != 0) {
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MMC_Disable();
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spi_unlock();
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return(tmp);
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}
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/* Do a short delay and send a clock-pulse to the MMC/SD-card */
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for (a = 0; a < 100; a++)
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spi_read();
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/* Send a start byte to the MMC/SD-card */
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spi_write(0xFE);
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/* Write the block (512 bytes) to the MMC/SD-card */
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for (b = 0; b < 512; b++)
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spi_write(*Buffer++);
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/* write the CRC-Byte */
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spi_write(0xFF); /* write a dummy CRC */
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spi_write(0xFF); /* CRC code is not used */
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/* Wait for MMC/SD-card busy */
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while (spi_read() != 0xff) {};
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/* set MMC_Chip_Select to high (MMC/SD-card inactive) */
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MMC_Disable();
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spi_unlock();
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return (0);
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}
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/* #########################################################################
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Routine to read the CSD register from the MMC/SD-card (16 bytes)
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######################################################################### */
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unsigned char mmc_read_csd (unsigned char *Buffer)
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{
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/* Command to read the CSD register */
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unsigned char CMD[] = {0x49, 0x00, 0x00, 0x00, 0x00, 0xFF};
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MMC_Read_Block(CMD, Buffer, 16);
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return (0);
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}
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