2 * drivers/mtd/nand/ts7250.c
4 * Copyright (C) 2004 Technologic Systems (support@embeddedARM.com)
6 * Derived from drivers/mtd/nand/edb7312.c
7 * Copyright (C) 2004 Marius Gröger (mag@sysgo.de)
9 * Derived from drivers/mtd/nand/autcpu12.c
10 * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
12 * $Id: ts7250.c,v 1.4 2004/12/30 22:02:07 joff Exp $
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
19 * This is a device driver for the NAND flash device found on the
20 * TS-7250 board which utilizes a Samsung 32 Mbyte part.
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/mtd/mtd.h>
27 #include <linux/mtd/nand.h>
28 #include <linux/mtd/partitions.h>
30 #include <asm/arch/hardware.h>
31 #include <asm/sizes.h>
32 #include <asm/mach-types.h>
35 * MTD structure for TS7250 board
37 static struct mtd_info *ts7250_mtd = NULL;
39 #ifdef CONFIG_MTD_PARTITIONS
40 static const char *part_probes[] = { "cmdlinepart", NULL };
42 #define NUM_PARTITIONS 3
45 * Define static partitions for flash device
47 static struct mtd_partition partition_info32[] = {
64 * Define static partitions for flash device
66 static struct mtd_partition partition_info128[] = {
85 * hardware specific access to control-lines
88 * NAND_NCE: bit 0 -> bit 2
89 * NAND_CLE: bit 1 -> bit 1
90 * NAND_ALE: bit 2 -> bit 0
92 static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
94 struct nand_chip *chip = mtd->priv;
96 if (ctrl & NAND_CTRL_CHANGE) {
97 unsigned long addr = TS72XX_NAND_CONTROL_VIRT_BASE;
100 bits = (ctrl & NAND_NCE) << 2;
101 bits |= ctrl & NAND_CLE;
102 bits |= (ctrl & NAND_ALE) >> 2;
104 __raw_writeb((__raw_readb(addr) & ~0x7) | bits, addr);
107 if (cmd != NAND_CMD_NONE)
108 writeb(cmd, chip->IO_ADDR_W);
112 * read device ready pin
114 static int ts7250_device_ready(struct mtd_info *mtd)
116 return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;
120 * Main initialization routine
122 static int __init ts7250_init(void)
124 struct nand_chip *this;
125 const char *part_type = 0;
126 int mtd_parts_nb = 0;
127 struct mtd_partition *mtd_parts = 0;
129 if (!machine_is_ts72xx() || board_is_ts7200())
132 /* Allocate memory for MTD device structure and private data */
133 ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
135 printk("Unable to allocate TS7250 NAND MTD device structure.\n");
139 /* Get pointer to private data */
140 this = (struct nand_chip *)(&ts7250_mtd[1]);
142 /* Initialize structures */
143 memset(ts7250_mtd, 0, sizeof(struct mtd_info));
144 memset(this, 0, sizeof(struct nand_chip));
146 /* Link the private data with the MTD structure */
147 ts7250_mtd->priv = this;
148 ts7250_mtd->owner = THIS_MODULE;
150 /* insert callbacks */
151 this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;
152 this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;
153 this->cmd_ctrl = ts7250_hwcontrol;
154 this->dev_ready = ts7250_device_ready;
155 this->chip_delay = 15;
156 this->ecc.mode = NAND_ECC_SOFT;
158 printk("Searching for NAND flash...\n");
159 /* Scan to find existence of the device */
160 if (nand_scan(ts7250_mtd, 1)) {
164 #ifdef CONFIG_MTD_PARTITIONS
165 ts7250_mtd->name = "ts7250-nand";
166 mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes, &mtd_parts, 0);
167 if (mtd_parts_nb > 0)
168 part_type = "command line";
172 if (mtd_parts_nb == 0) {
173 mtd_parts = partition_info32;
174 if (ts7250_mtd->size >= (128 * 0x100000))
175 mtd_parts = partition_info128;
176 mtd_parts_nb = NUM_PARTITIONS;
177 part_type = "static";
180 /* Register the partitions */
181 printk(KERN_NOTICE "Using %s partition definition\n", part_type);
182 add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);
188 module_init(ts7250_init);
193 static void __exit ts7250_cleanup(void)
195 /* Unregister the device */
196 del_mtd_device(ts7250_mtd);
198 /* Free the MTD device structure */
202 module_exit(ts7250_cleanup);
204 MODULE_LICENSE("GPL");
205 MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");
206 MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");