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-rw-r--r--board/prodrive/alpr/nand.c173
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diff --git a/board/prodrive/alpr/nand.c b/board/prodrive/alpr/nand.c
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+/*
+ * (C) Copyright 2006
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de
+ *
+ * (C) Copyright 2006
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * 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 (CONFIG_COMMANDS & CFG_CMD_NAND)
+
+#include <asm/processor.h>
+#include <nand.h>
+
+struct alpr_ndfc_regs {
+ u8 cmd[4];
+ u8 addr_wait;
+ u8 term;
+ u8 dummy;
+ u8 dummy2;
+ u8 data;
+};
+
+static u8 hwctl;
+static struct alpr_ndfc_regs *alpr_ndfc = NULL;
+
+#define readb(addr) (u8)(*(volatile u8 *)(addr))
+#define writeb(d,addr) *(volatile u8 *)(addr) = ((u8)(d))
+
+/*
+ * The ALPR has a NAND Flash Controller (NDFC) that handles all accesses to
+ * the NAND devices. The NDFC has command, address and data registers that
+ * when accessed will set up the NAND flash pins appropriately. We'll use the
+ * hwcontrol function to save the configuration in a global variable.
+ * We can then use this information in the read and write functions to
+ * determine which NDFC register to access.
+ *
+ * There are 2 NAND devices on the board, a Hynix HY27US08561A (1 GByte).
+ */
+static void alpr_nand_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+ switch (cmd) {
+ case NAND_CTL_SETCLE:
+ hwctl |= 0x1;
+ break;
+ case NAND_CTL_CLRCLE:
+ hwctl &= ~0x1;
+ break;
+ case NAND_CTL_SETALE:
+ hwctl |= 0x2;
+ break;
+ case NAND_CTL_CLRALE:
+ hwctl &= ~0x2;
+ break;
+ case NAND_CTL_SETNCE:
+ break;
+ case NAND_CTL_CLRNCE:
+ writeb(0x00, &(alpr_ndfc->term));
+ break;
+ }
+}
+
+static void alpr_nand_write_byte(struct mtd_info *mtd, u_char byte)
+{
+ struct nand_chip *nand = mtd->priv;
+
+ if (hwctl & 0x1)
+ /*
+ * IO_ADDR_W used as CMD[i] reg to support multiple NAND
+ * chips.
+ */
+ writeb(byte, nand->IO_ADDR_W);
+ else if (hwctl & 0x2) {
+ writeb(byte, &(alpr_ndfc->addr_wait));
+ } else
+ writeb(byte, &(alpr_ndfc->data));
+}
+
+static u_char alpr_nand_read_byte(struct mtd_info *mtd)
+{
+ return readb(&(alpr_ndfc->data));
+}
+
+static void alpr_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
+{
+ struct nand_chip *nand = mtd->priv;
+ int i;
+
+ for (i = 0; i < len; i++) {
+ if (hwctl & 0x1)
+ /*
+ * IO_ADDR_W used as CMD[i] reg to support multiple NAND
+ * chips.
+ */
+ writeb(buf[i], nand->IO_ADDR_W);
+ else if (hwctl & 0x2)
+ writeb(buf[i], &(alpr_ndfc->addr_wait));
+ else
+ writeb(buf[i], &(alpr_ndfc->data));
+ }
+}
+
+static void alpr_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ buf[i] = readb(&(alpr_ndfc->data));
+ }
+}
+
+static int alpr_nand_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ if (buf[i] != readb(&(alpr_ndfc->data)))
+ return i;
+
+ return 0;
+}
+
+static int alpr_nand_dev_ready(struct mtd_info *mtd)
+{
+ volatile u_char val;
+
+ /*
+ * Blocking read to wait for NAND to be ready
+ */
+ val = readb(&(alpr_ndfc->addr_wait));
+
+ /*
+ * Return always true
+ */
+ return 1;
+}
+
+void board_nand_init(struct nand_chip *nand)
+{
+ alpr_ndfc = (struct alpr_ndfc_regs *)CFG_NAND_BASE;
+
+ nand->eccmode = NAND_ECC_SOFT;
+
+ /* Reference hardware control function */
+ nand->hwcontrol = alpr_nand_hwcontrol;
+ /* Set command delay time */
+ nand->write_byte = alpr_nand_write_byte;
+ nand->read_byte = alpr_nand_read_byte;
+ nand->write_buf = alpr_nand_write_buf;
+ nand->read_buf = alpr_nand_read_buf;
+ nand->verify_buf = alpr_nand_verify_buf;
+ nand->dev_ready = alpr_nand_dev_ready;
+}
+#endif