Add port for the lpc2292sodimm evaluation board from EmbeddedArtists

1 files changed, 233 insertions, 0 deletions

diff --git a/board/lpc2292sodimm/mmc_hw.c b/board/lpc2292sodimm/mmc_hw.c
new file mode 100644
index 0000000..0b5ddf9
--- /dev/null
+++ b/board/lpc2292sodimm/mmc_hw.c
@@ -0,0 +1,233 @@
+/*
+    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 "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);
+}