1 files changed, 218 insertions, 0 deletions
diff --git a/board/socrates/nand.c b/board/socrates/nand.c
new file mode 100644
index 0000000..fc82ecb
--- /dev/null
+++ b/board/socrates/nand.c
@@ -0,0 +1,218 @@
+/*
+ * (C) Copyright 2008
+ * Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <common.h>
+
+#if defined(CFG_NAND_BASE)
+#include <nand.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+
+static int state;
+static void nand_write_byte(struct mtd_info *mtd, u_char byte);
+static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len);
+static void nand_write_word(struct mtd_info *mtd, u16 word);
+static u_char nand_read_byte(struct mtd_info *mtd);
+static u16 nand_read_word(struct mtd_info *mtd);
+static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len);
+static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len);
+static int nand_device_ready(struct mtd_info *mtdinfo);
+static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd);
+
+#define FPGA_NAND_CMD_MASK		(0x7 << 28)
+#define FPGA_NAND_CMD_COMMAND	(0x0 << 28)
+#define FPGA_NAND_CMD_ADDR		(0x1 << 28)
+#define FPGA_NAND_CMD_READ		(0x2 << 28)
+#define FPGA_NAND_CMD_WRITE		(0x3 << 28)
+#define FPGA_NAND_BUSY			(0x1 << 15)
+#define FPGA_NAND_ENABLE		(0x1 << 31)
+#define FPGA_NAND_DATA_SHIFT	16
+
+/**
+ * nand_write_byte -  write one byte to the chip
+ * @mtd:	MTD device structure
+ * @byte:	pointer to data byte to write
+ */
+static void nand_write_byte(struct mtd_info *mtd, u_char byte)
+{
+	nand_write_buf(mtd, (const uchar *)&byte, sizeof(byte));
+}
+
+/**
+ * nand_write_word -  write one word to the chip
+ * @mtd:	MTD device structure
+ * @word:	data word to write
+ */
+static void nand_write_word(struct mtd_info *mtd, u16 word)
+{
+	nand_write_buf(mtd, (const uchar *)&word, sizeof(word));
+}
+
+/**
+ * nand_write_buf -  write buffer to chip
+ * @mtd:	MTD device structure
+ * @buf:	data buffer
+ * @len:	number of bytes to write
+ */
+static void nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
+{
+	int i;
+	struct nand_chip *this = mtd->priv;
+	long val;
+
+	if ((state & FPGA_NAND_CMD_MASK) == FPGA_NAND_CMD_MASK) {
+		/* Write data */
+		val = (state & FPGA_NAND_ENABLE) | FPGA_NAND_CMD_WRITE;
+	} else {
+		/* Write address or command */
+		val = state;
+	}
+
+	for (i = 0; i < len; i++) {
+		out_be32(this->IO_ADDR_W, val | (buf[i] << FPGA_NAND_DATA_SHIFT));
+	}
+}
+
+
+/**
+ * nand_read_byte -  read one byte from the chip
+ * @mtd:	MTD device structure
+ */
+static u_char nand_read_byte(struct mtd_info *mtd)
+{
+	u8 byte;
+	nand_read_buf(mtd, (uchar *)&byte, sizeof(byte));
+	return byte;
+}
+
+/**
+ * nand_read_word -  read one word from the chip
+ * @mtd:	MTD device structure
+ */
+static u16 nand_read_word(struct mtd_info *mtd)
+{
+	u16 word;
+	nand_read_buf(mtd, (uchar *)&word, sizeof(word));
+	return word;
+}
+
+/**
+ * nand_read_buf -  read chip data into buffer
+ * @mtd:	MTD device structure
+ * @buf:	buffer to store date
+ * @len:	number of bytes to read
+ */
+static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+	int i;
+	struct nand_chip *this = mtd->priv;
+	int val;
+
+	val = (state & FPGA_NAND_ENABLE) | FPGA_NAND_CMD_READ;
+
+	out_be32(this->IO_ADDR_W, val);
+	for (i = 0; i < len; i++) {
+		buf[i] = (in_be32(this->IO_ADDR_R) >> FPGA_NAND_DATA_SHIFT) & 0xff;
+	}
+}
+
+/**
+ * nand_verify_buf -  Verify chip data against buffer
+ * @mtd:	MTD device structure
+ * @buf:	buffer containing the data to compare
+ * @len:	number of bytes to compare
+ */
+static int nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		if (buf[i] != nand_read_byte(mtd));
+		return -EFAULT;
+	}
+	return 0;
+}
+
+/**
+ * nand_device_ready - Check the NAND device is ready for next command.
+ * @mtd:	MTD device structure
+ */
+static int nand_device_ready(struct mtd_info *mtdinfo)
+{
+	struct nand_chip *this = mtdinfo->priv;
+
+	if (in_be32(this->IO_ADDR_W) & FPGA_NAND_BUSY)
+		return 0; /* busy */
+	return 1;
+}
+
+/**
+ * nand_hwcontrol - NAND control functions wrapper.
+ * @mtd:	MTD device structure
+ * @cmd:	Command
+ */
+static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+{
+
+	switch(cmd) {
+	case NAND_CTL_CLRALE:
+		state |= FPGA_NAND_CMD_MASK; /* use all 1s to mark */
+		break;
+	case NAND_CTL_CLRCLE:
+		state |= FPGA_NAND_CMD_MASK; /* use all 1s to mark */
+		break;
+	case NAND_CTL_SETCLE:
+		state = (state & ~FPGA_NAND_CMD_MASK) | FPGA_NAND_CMD_COMMAND;
+		break;
+	case NAND_CTL_SETALE:
+		state = (state & ~FPGA_NAND_CMD_MASK) | FPGA_NAND_CMD_ADDR;
+		break;
+	case NAND_CTL_SETNCE:
+		state |= FPGA_NAND_ENABLE;
+		break;
+	case NAND_CTL_CLRNCE:
+		state &= ~FPGA_NAND_ENABLE;
+		break;
+	default:
+		printf("%s: unknown cmd %#x\n", __FUNCTION__, cmd);
+		break;
+	}
+}
+
+int board_nand_init(struct nand_chip *nand)
+{
+	nand->hwcontrol = nand_hwcontrol;
+	nand->eccmode = NAND_ECC_SOFT;
+	nand->dev_ready = nand_device_ready;
+	nand->write_byte = nand_write_byte;
+	nand->read_byte = nand_read_byte;
+	nand->write_word = nand_write_word;
+	nand->read_word = nand_read_word;
+	nand->write_buf = nand_write_buf;
+	nand->read_buf = nand_read_buf;
+	nand->verify_buf = nand_verify_buf;
+
+	return 0;
+}
+
+#endif