Merge the new NAND code (testing-NAND brach); see doc/README.nand

Rewrite of NAND code based on what is in 2.6.12 Linux kernel
Patch by Ladislav Michl, 29 Jun 2005

[Merge with /home/tur/nand/u-boot]

1 files changed, 117 insertions, 0 deletions

diff --git a/board/dave/PPChameleonEVB/nand.c b/board/dave/PPChameleonEVB/nand.c
new file mode 100644
index 0000000..61edc78
--- /dev/null
+++ b/board/dave/PPChameleonEVB/nand.c
@@ -0,0 +1,117 @@
+/*
+ * (C) Copyright 2006 DENX Software Engineering
+ *
+ * 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 <nand.h>
+
+/*
+ * hardware specific access to control-lines
+ * function borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c)
+ */
+static void ppchameleonevb_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+{
+	struct nand_chip *this = mtdinfo->priv;
+	ulong base = (ulong) this->IO_ADDR_W;
+
+	switch(cmd) {
+	case NAND_CTL_SETCLE:
+		MACRO_NAND_CTL_SETCLE((unsigned long)base);
+		break;
+	case NAND_CTL_CLRCLE:
+		MACRO_NAND_CTL_CLRCLE((unsigned long)base);
+		break;
+	case NAND_CTL_SETALE:
+		MACRO_NAND_CTL_SETALE((unsigned long)base);
+		break;
+	case NAND_CTL_CLRALE:
+		MACRO_NAND_CTL_CLRALE((unsigned long)base);
+		break;
+	case NAND_CTL_SETNCE:
+		MACRO_NAND_ENABLE_CE((unsigned long)base);
+		break;
+	case NAND_CTL_CLRNCE:
+		MACRO_NAND_DISABLE_CE((unsigned long)base);
+		break;
+	}
+}
+
+
+/*
+ * read device ready pin
+ * function +/- borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c)
+ */
+static int ppchameleonevb_device_ready(struct mtd_info *mtdinfo)
+{
+	struct nand_chip *this = mtdinfo->priv;
+	ulong rb_gpio_pin;
+
+	/* use the base addr to find out which chip are we dealing with */
+	switch((ulong) this->IO_ADDR_W) {
+	case CFG_NAND0_BASE:
+		rb_gpio_pin = CFG_NAND0_RDY;
+		break;
+	case CFG_NAND1_BASE:
+		rb_gpio_pin = CFG_NAND1_RDY;
+		break;
+	default: /* this should never happen */
+		return 0;
+		break;
+	}
+
+        if (in32(GPIO0_IR) & rb_gpio_pin)
+		return 1;
+	return 0;
+}
+
+
+/*
+ * Board-specific NAND initialization. The following members of the
+ * argument are board-specific (per include/linux/mtd/nand.h):
+ * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
+ * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
+ * - hwcontrol: hardwarespecific function for accesing control-lines
+ * - dev_ready: hardwarespecific function for  accesing device ready/busy line
+ * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
+ *   only be provided if a hardware ECC is available
+ * - eccmode: mode of ecc, see defines
+ * - chip_delay: chip dependent delay for transfering data from array to
+ *   read regs (tR)
+ * - options: various chip options. They can partly be set to inform
+ *   nand_scan about special functionality. See the defines for further
+ *   explanation
+ * Members with a "?" were not set in the merged testing-NAND branch,
+ * so they are not set here either.
+ */
+void board_nand_init(struct nand_chip *nand)
+{
+
+	nand->hwcontrol = ppchameleonevb_hwcontrol;
+	nand->dev_ready = ppchameleonevb_device_ready;
+	nand->eccmode = NAND_ECC_SOFT;
+	nand->chip_delay = NAND_BIG_DELAY_US;
+	nand->options = NAND_SAMSUNG_LP_OPTIONS;
+}
+#endif /* (CONFIG_COMMANDS & CFG_CMD_NAND) */