--- /dev/null
+/*
+ * 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
+ *
+ * ctrl:
+ * NAND_NCE: bit 0 -> bit 2
+ * NAND_CLE: bit 1 -> bit 1
+ * NAND_ALE: bit 2 -> bit 0
+ */
+static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+ struct nand_chip *chip = mtd->priv;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+ unsigned long addr = TS72XX_NAND_CONTROL_VIRT_BASE;
+ unsigned char bits;
+
+ bits = (ctrl & NAND_NCE) << 2;
+ bits |= ctrl & NAND_CLE;
+ bits |= (ctrl & NAND_ALE) >> 2;
+
+ __raw_writeb((__raw_readb(addr) & ~0x7) | bits, addr);
+ }
+
+ if (cmd != NAND_CMD_NONE)
+ writeb(cmd, chip->IO_ADDR_W);
+}
+
+/*
+ * 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;
+ ts7250_mtd->owner = THIS_MODULE;
+
+ /* insert callbacks */
+ this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
+ this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
+ this->cmd_ctrl = ts7250_hwcontrol;
+ this->dev_ready = ts7250_device_ready;
+ this->chip_delay = 15;
+ this->ecc.mode = 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");
git://git.onelab.eu / linux-2.6.git / blobdiff