+++ /dev/null
-/*
- 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);
-}
projects / u-boot / blobdiff