[Blackfin][PATCH] Add BF537 stamp board support

1 files changed, 106 insertions, 0 deletions

diff --git a/board/bf537-stamp/nand.c b/board/bf537-stamp/nand.c
new file mode 100644
index 0000000..4d6e776
--- /dev/null
+++ b/board/bf537-stamp/nand.c
@@ -0,0 +1,106 @@
+/*
+ * (C) Copyright 2006 Aubrey.Li, aubrey.li@analog.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>
+#include <asm/io.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_NAND)
+
+#include <nand.h>
+
+#define CONCAT(a,b,c,d) a ## b ## c ## d
+#define PORT(a,b)  CONCAT(pPORT,a,b,)
+
+#ifndef CONFIG_NAND_GPIO_PORT
+#define CONFIG_NAND_GPIO_PORT F
+#endif
+
+/*
+ * hardware specific access to control-lines
+ */
+static void bfin_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+	register struct nand_chip *this = mtd->priv;
+
+	switch (cmd) {
+
+	case NAND_CTL_SETCLE:
+		this->IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_CLE;
+		break;
+	case NAND_CTL_CLRCLE:
+		this->IO_ADDR_W = CFG_NAND_BASE;
+		break;
+
+	case NAND_CTL_SETALE:
+		this->IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_ALE;
+		break;
+	case NAND_CTL_CLRALE:
+		this->IO_ADDR_W = CFG_NAND_BASE;
+		break;
+	case NAND_CTL_SETNCE:
+	case NAND_CTL_CLRNCE:
+		break;
+	}
+
+	this->IO_ADDR_R = this->IO_ADDR_W;
+
+	/* Drain the writebuffer */
+	sync();
+}
+
+int bfin_device_ready(struct mtd_info *mtd)
+{
+	int ret = (*PORT(CONFIG_NAND_GPIO_PORT, IO) & BFIN_NAND_READY) ? 1 : 0;
+	sync();
+	return ret;
+}
+
+/*
+ * 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)
+{
+	*PORT(CONFIG_NAND_GPIO_PORT, _FER) &= ~BFIN_NAND_READY;
+	*PORT(CONFIG_NAND_GPIO_PORT, IO_DIR) &= ~BFIN_NAND_READY;
+	*PORT(CONFIG_NAND_GPIO_PORT, IO_INEN) |= BFIN_NAND_READY;
+
+	nand->hwcontrol = bfin_hwcontrol;
+	nand->eccmode = NAND_ECC_SOFT;
+	nand->dev_ready = bfin_device_ready;
+	nand->chip_delay = 30;
+}
+#endif				/* (CONFIG_COMMANDS & CFG_CMD_NAND) */