ts72xx NAND driver

The TS-72xx is a series of embedded single board computers from
Technologic Systems based on the Cirrus ep93xx (arm920t based) CPU.

The TS-7200 uses NOR flash, while all the other models in the series
(TS-7250, TS-7260) use NAND flash -- included is a driver for the NAND
flash on those boards.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/nand/Kconfig

@@ -55,6 +55,12 @@ config MTD_NAND_TOTO
 	help
 	  Support for NAND flash on Texas Instruments Toto platform.
 
+config MTD_NAND_TS7250
+	tristate "NAND Flash device on TS-7250 board"
+	depends on MACH_TS72XX && MTD_NAND
+	help
+	  Support for NAND flash on Technologic Systems TS-7250 platform.
+
 config MTD_NAND_IDS
 	tristate
 

drivers/mtd/nand/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_MTD_NAND_DISKONCHIP)	+= diskonchip.o
 obj-$(CONFIG_MTD_NAND_H1900)		+= h1910.o
 obj-$(CONFIG_MTD_NAND_RTC_FROM4)	+= rtc_from4.o
 obj-$(CONFIG_MTD_NAND_SHARPSL)		+= sharpsl.o
+obj-$(CONFIG_MTD_NAND_TS7250)		+= ts7250.o
 obj-$(CONFIG_MTD_NAND_NANDSIM)		+= nandsim.o
 
 nand-objs = nand_base.o nand_bbt.o

drivers/mtd/nand/ts7250.c

@@ -0,0 +1,208 @@
+/*
+ * drivers/mtd/nand/ts7250.c
+ *
+ * Copyright (C) 2004 Technologic Systems (support@embeddedARM.com)
+ *
+ * Derived from drivers/mtd/nand/edb7312.c
+ *   Copyright (C) 2004 Marius Gröger (mag@sysgo.de)
+ *
+ * Derived from drivers/mtd/nand/autcpu12.c
+ *   Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
+ *
+ * $Id: ts7250.c,v 1.4 2004/12/30 22:02:07 joff Exp $
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Overview:
+ *   This is a device driver for the NAND flash device found on the
+ *   TS-7250 board which utilizes a Samsung 32 Mbyte part.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/sizes.h>
+#include <asm/mach-types.h>
+
+/*
+ * MTD structure for TS7250 board
+ */
+static struct mtd_info *ts7250_mtd = NULL;
+
+#ifdef CONFIG_MTD_PARTITIONS
+static const char *part_probes[] = { "cmdlinepart", NULL };
+
+#define NUM_PARTITIONS 3
+
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info32[] = {
+	{
+		.name		= "TS-BOOTROM",
+		.offset		= 0x00000000,
+		.size		= 0x00004000,
+	}, {
+		.name		= "Linux",
+		.offset		= 0x00004000,
+		.size		= 0x01d00000,
+	}, {
+		.name		= "RedBoot",
+		.offset		= 0x01d04000,
+		.size		= 0x002fc000,
+	},
+};
+
+/*
+ * Define static partitions for flash device
+ */
+static struct mtd_partition partition_info128[] = {
+	{
+		.name		= "TS-BOOTROM",
+		.offset		= 0x00000000,
+		.size		= 0x00004000,
+	}, {
+		.name		= "Linux",
+		.offset		= 0x00004000,
+		.size		= 0x07d00000,
+	}, {
+		.name		= "RedBoot",
+		.offset		= 0x07d04000,
+		.size		= 0x002fc000,
+	},
+};
+#endif
+
+
+/*
+ *	hardware specific access to control-lines
+ */
+static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+	unsigned long ctrl = TS72XX_NAND_CONTROL_VIRT_BASE;
+
+	switch(cmd) {
+	case NAND_CTL_SETCLE:
+		__raw_writeb(__raw_readb(ctrl) | 0x2, ctrl);
+		break;
+	case NAND_CTL_CLRCLE:
+		__raw_writeb(__raw_readb(ctrl) & ~0x2, ctrl);
+		break;
+	case NAND_CTL_SETALE:
+		__raw_writeb(__raw_readb(ctrl) | 0x1, ctrl);
+		break;
+	case NAND_CTL_CLRALE:
+		__raw_writeb(__raw_readb(ctrl) & ~0x1, ctrl);
+		break;
+	case NAND_CTL_SETNCE:
+		__raw_writeb(__raw_readb(ctrl) | 0x4, ctrl);
+		break;
+	case NAND_CTL_CLRNCE:
+		__raw_writeb(__raw_readb(ctrl) & ~0x4, ctrl);
+		break;
+	}
+}
+
+/*
+ *	read device ready pin
+ */
+static int ts7250_device_ready(struct mtd_info *mtd)
+{
+	return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
+}
+
+/*
+ * Main initialization routine
+ */
+static int __init ts7250_init(void)
+{
+	struct nand_chip *this;
+	const char *part_type = 0;
+	int mtd_parts_nb = 0;
+	struct mtd_partition *mtd_parts = 0;
+
+	if (!machine_is_ts72xx() || board_is_ts7200())
+		return -ENXIO;
+
+	/* Allocate memory for MTD device structure and private data */
+	ts7250_mtd = kmalloc(sizeof(struct mtd_info) +
+				sizeof(struct nand_chip), GFP_KERNEL);
+	if (!ts7250_mtd) {
+		printk("Unable to allocate TS7250 NAND MTD device structure.\n");
+		return -ENOMEM;
+	}
+
+	/* Get pointer to private data */
+	this = (struct nand_chip *)(&ts7250_mtd[1]);
+
+	/* Initialize structures */
+	memset(ts7250_mtd, 0, sizeof(struct mtd_info));
+	memset(this, 0, sizeof(struct nand_chip));
+
+	/* Link the private data with the MTD structure */
+	ts7250_mtd->priv = this;
+
+	/* insert callbacks */
+	this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
+	this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
+	this->hwcontrol = ts7250_hwcontrol;
+	this->dev_ready = ts7250_device_ready;
+	this->chip_delay = 15;
+	this->eccmode = NAND_ECC_SOFT;
+
+	printk("Searching for NAND flash...\n");
+	/* Scan to find existence of the device */
+	if (nand_scan(ts7250_mtd, 1)) {
+		kfree(ts7250_mtd);
+		return -ENXIO;
+	}
+
+#ifdef CONFIG_MTD_PARTITIONS
+	ts7250_mtd->name = "ts7250-nand";
+	mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes,
+						&mtd_parts, 0);
+	if (mtd_parts_nb > 0)
+		part_type = "command line";
+	else
+		mtd_parts_nb = 0;
+#endif
+	if (mtd_parts_nb == 0) {
+		mtd_parts = partition_info32;
+		if (ts7250_mtd->size >= (128 * 0x100000))
+			mtd_parts = partition_info128;
+		mtd_parts_nb = NUM_PARTITIONS;
+		part_type = "static";
+	}
+
+	/* Register the partitions */
+	printk(KERN_NOTICE "Using %s partition definition\n", part_type);
+	add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
+
+	/* Return happy */
+	return 0;
+}
+module_init(ts7250_init);
+
+/*
+ * Clean up routine
+ */
+static void __exit ts7250_cleanup(void)
+{
+	/* Unregister the device */
+	del_mtd_device(ts7250_mtd);
+
+	/* Free the MTD device structure */
+	kfree(ts7250_mtd);
+}
+module_exit(ts7250_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
+MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");