[U-Boot] [PATCH v2 1/3][repost] nand: Add Marvell Kirkwood NAND driver

[Prafulla Wadaskar]

This patch adds a NAND driver for the Marvell Kirkwood SoC's.

Acked-by: Stefan Roese <sr at denx.de>
Signed-off-by: Prafulla Wadaskar <prafulla at marvell.com>
---
Change log:
v2: updated as per feedback for v1 (cosmetic change)

 drivers/mtd/nand/Makefile        |    1 +
 drivers/mtd/nand/kirkwood_nand.c |   81 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mtd/nand/kirkwood_nand.c

diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 471cd6b..766c3f0 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -40,6 +40,7 @@ COBJS-$(CONFIG_DRIVER_NAND_BFIN) += bfin_nand.o
 COBJS-$(CONFIG_NAND_DAVINCI) += davinci_nand.o
 COBJS-$(CONFIG_NAND_FSL_ELBC) += fsl_elbc_nand.o
 COBJS-$(CONFIG_NAND_FSL_UPM) += fsl_upm.o
+COBJS-$(CONFIG_NAND_KIRKWOOD) += kirkwood_nand.o
 COBJS-$(CONFIG_NAND_NOMADIK) += nomadik.o
 COBJS-$(CONFIG_NAND_S3C2410) += s3c2410_nand.c
 COBJS-$(CONFIG_NAND_S3C64XX) += s3c64xx.o
diff --git a/drivers/mtd/nand/kirkwood_nand.c b/drivers/mtd/nand/kirkwood_nand.c
new file mode 100644
index 0000000..9cdbe20
--- /dev/null
+++ b/drivers/mtd/nand/kirkwood_nand.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) Marvell International Ltd. and its affiliates
+ * Written-by: Prafulla Wadaskar <prafulla at marvell.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>
+#include <asm/arch/kirkwood.h>
+#include <nand.h>
+
+/* NAND Flash Soc registers */
+struct kwnandf_registers {
+	u32 rd_params;	/* 0x10418 */
+	u32 wr_param;	/* 0x1041c */
+	u8  pad[0x10470 - 0x1041c - 4];
+	u32 ctrl;	/* 0x10470 */
+};
+
+static struct kwnandf_registers *nf_reg =
+	(struct kwnandf_registers *)KW_NANDF_BASE;
+
+/*
+ * hardware specific access to control-lines/bits
+ */
+#define NAND_ACTCEBOOT_BIT		0x02
+
+static void kw_nand_hwcontrol(struct mtd_info *mtd, int cmd,
+			      unsigned int ctrl)
+{
+	struct nand_chip *nc = mtd->priv;
+	u32 offs;
+
+	if (cmd == NAND_CMD_NONE)
+		return;
+
+	if (ctrl & NAND_CLE)
+		offs = (1 << 0);	/* Commands with A[1:0] == 01 */
+	else if (ctrl & NAND_ALE)
+		offs = (1 << 1);	/* Addresses with A[1:0] == 10 */
+	else
+		return;
+
+	writeb(cmd, nc->IO_ADDR_W + offs);
+}
+
+void kw_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+	u32 data;
+
+	data = readl(&nf_reg->ctrl);
+	data |= NAND_ACTCEBOOT_BIT;
+	writel(data, &nf_reg->ctrl);
+}
+
+int board_nand_init(struct nand_chip *nand)
+{
+	nand->options = NAND_COPYBACK | NAND_CACHEPRG | NAND_NO_PADDING;
+	nand->ecc.mode = NAND_ECC_SOFT;
+	nand->cmd_ctrl = kw_nand_hwcontrol;
+	nand->chip_delay = 30;
+	nand->select_chip = kw_nand_select_chip;
+	return 0;
+}
-- 
1.5.3.4