From d22c77b8089747f892ce5b9baee55b3cb438ba26 Mon Sep 17 00:00:00 2001
From: Florian Fainelli <florian@openwrt.org>
Date: Tue, 17 Apr 2007 22:15:50 +0000
Subject: Move NAND driver from rb1xx to adm5120, rbmipsnand fixed by David
 Goodenough, thanks !

SVN-Revision: 6991
---
 .../files/drivers/mtd/nand/rbmipsnand.c            | 111 +++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c

(limited to 'target/linux/adm5120-2.6/files/drivers/mtd')

diff --git a/target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c b/target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c
new file mode 100644
index 0000000..f086552
--- /dev/null
+++ b/target/linux/adm5120-2.6/files/drivers/mtd/nand/rbmipsnand.c
@@ -0,0 +1,111 @@
+/*==============================================================================*/
+/* rbmipsnand.c                                                                 */
+/* This module is derived from the 2.4 driver shipped by Microtik for their     */
+/* Routerboard 1xx and 5xx series boards.  It provides support for the built in */
+/* NAND flash on the Routerboard 1xx series boards for Linux 2.6.19+.           */
+/* Licence: Original Microtik code seems not to have a licence.                 */
+/*          Rewritten code all GPL V2.                                          */
+/* Copyright(C) 2007 david.goodenough@linkchoose.co.uk (for rewriten code)      */
+/*==============================================================================*/
+
+#include <linux/init.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/bootinfo.h>
+
+#define SMEM1_BASE 0x10000000   // from ADM5120 documentation
+#define SMEM1(x) (*((volatile unsigned char *) (KSEG1ADDR(SMEM1_BASE) + x)))
+
+#define NAND_RW_REG	0x0	//data register
+#define NAND_SET_CEn	0x1	//CE# low
+#define NAND_CLR_CEn	0x2	//CE# high
+#define NAND_CLR_CLE	0x3	//CLE low
+#define NAND_SET_CLE	0x4	//CLE high
+#define NAND_CLR_ALE	0x5	//ALE low
+#define NAND_SET_ALE	0x6	//ALE high
+#define NAND_SET_SPn	0x7	//SP# low (use spare area)
+#define NAND_CLR_SPn	0x8	//SP# high (do not use spare area)
+#define NAND_SET_WPn	0x9	//WP# low
+#define NAND_CLR_WPn	0xA	//WP# high
+#define NAND_STS_REG	0xB	//Status register
+
+#define MEM32(x) *((volatile unsigned *) (x))
+static void __iomem *p_nand;
+
+static int rb100_dev_ready(struct mtd_info *mtd) {
+    return SMEM1(NAND_STS_REG) & 0x80;
+}
+
+static void rbmips_hwcontrol100(struct mtd_info *mtd, int cmd, unsigned int ctrl) {
+    struct nand_chip *chip = mtd->priv;
+    if (ctrl & NAND_CTRL_CHANGE) {
+        SMEM1((( ctrl & NAND_CLE) ? NAND_SET_CLE : NAND_CLR_CLE)) = 0x01;
+        SMEM1((( ctrl & NAND_ALE) ? NAND_SET_ALE : NAND_CLR_ALE)) = 0x01;
+        SMEM1((( ctrl & NAND_NCE) ? NAND_SET_CEn : NAND_CLR_CEn)) = 0x01;
+        }
+    if( cmd != NAND_CMD_NONE)
+        writeb( cmd, chip->IO_ADDR_W);
+}
+
+static struct mtd_partition partition_info[] = {
+    {
+        name: "RouterBoard NAND Boot",
+        offset: 0,
+	size: 4 * 1024 * 1024
+    },
+    {
+        name: "RouterBoard NAND Main",
+	offset: MTDPART_OFS_NXTBLK,
+	size: MTDPART_SIZ_FULL
+    }
+};
+
+static struct mtd_info rmtd;
+static struct nand_chip rnand;
+
+static unsigned init_ok = 0;
+
+unsigned get_rbnand_block_size(void) {
+	return init_ok ? rmtd.writesize : 0;
+}
+
+EXPORT_SYMBOL(get_rbnand_block_size);
+
+int __init rbmips_init(void) {
+	memset(&rmtd, 0, sizeof(rmtd));
+	memset(&rnand, 0, sizeof(rnand));
+	printk("RB1xx nand\n");
+	MEM32(0xB2000064) = 0x100;
+	MEM32(0xB2000008) = 0x1;
+	SMEM1(NAND_SET_SPn) = 0x01;
+	SMEM1(NAND_CLR_WPn) = 0x01;
+	rnand.IO_ADDR_R = (unsigned char *)KSEG1ADDR(SMEM1_BASE);
+	rnand.IO_ADDR_W = rnand.IO_ADDR_R;
+	rnand.cmd_ctrl = rbmips_hwcontrol100;
+	rnand.dev_ready = rb100_dev_ready;
+	p_nand = (void __iomem *)ioremap(( unsigned long)SMEM1_BASE, 0x1000);
+	if (!p_nand) {
+		printk("RB1xx nand Unable ioremap buffer");
+		return -ENXIO;
+	}
+	rnand.ecc.mode = NAND_ECC_SOFT;
+	rnand.chip_delay = 25;
+	rnand.options |= NAND_NO_AUTOINCR;
+	rmtd.priv = &rnand;
+	if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)
+	    && nand_scan(&rmtd, 1)  && nand_scan(&rmtd, 1)) {
+		printk("RB1xxx nand device not found");
+		iounmap ((void *)p_nand);
+		return -ENXIO;
+	}
+	add_mtd_partitions(&rmtd, partition_info, 2);
+	init_ok = 1;
+	return 0;
+}
+
+module_init(rbmips_init);
+
-- 
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