2 * drivers/mtd/nand/h1910.c
4 * Copyright (C) 2003 Joshua Wise (joshua@joshuawise.com)
6 * Derived from drivers/mtd/nand/edb7312.c
7 * Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
8 * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
10 * $Id: h1910.c,v 1.6 2005/11/07 11:14:30 gleixner Exp $
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
17 * This is a device driver for the NAND flash device found on the
18 * iPAQ h1910 board which utilizes the Samsung K9F2808 part. This is
19 * a 128Mibit (16MiB x 8 bits) NAND flash device.
22 #include <linux/slab.h>
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/mtd/mtd.h>
26 #include <linux/mtd/nand.h>
27 #include <linux/mtd/partitions.h>
29 #include <asm/arch/hardware.h> /* for CLPS7111_VIRT_BASE */
30 #include <asm/sizes.h>
31 #include <asm/arch/h1900-gpio.h>
32 #include <asm/arch/ipaq.h>
35 * MTD structure for EDB7312 board
37 static struct mtd_info *h1910_nand_mtd = NULL;
43 #ifdef CONFIG_MTD_PARTITIONS
45 * Define static partitions for flash device
47 static struct mtd_partition partition_info[] = {
48 {name:"h1910 NAND Flash",
50 size:16 * 1024 * 1024}
53 #define NUM_PARTITIONS 1
58 * hardware specific access to control-lines
60 static void h1910_hwcontrol(struct mtd_info *mtd, int cmd)
62 struct nand_chip *this = (struct nand_chip *)(mtd->priv);
67 this->IO_ADDR_R |= (1 << 2);
68 this->IO_ADDR_W |= (1 << 2);
71 this->IO_ADDR_R &= ~(1 << 2);
72 this->IO_ADDR_W &= ~(1 << 2);
76 this->IO_ADDR_R |= (1 << 3);
77 this->IO_ADDR_W |= (1 << 3);
80 this->IO_ADDR_R &= ~(1 << 3);
81 this->IO_ADDR_W &= ~(1 << 3);
92 * read device ready pin
95 static int h1910_device_ready(struct mtd_info *mtd)
97 return (GPLR(55) & GPIO_bit(55));
102 * Main initialization routine
104 static int __init h1910_init(void)
106 struct nand_chip *this;
107 const char *part_type = 0;
108 int mtd_parts_nb = 0;
109 struct mtd_partition *mtd_parts = 0;
110 void __iomem *nandaddr;
112 if (!machine_is_h1900())
115 nandaddr = ioremap(0x08000000, 0x1000);
117 printk("Failed to ioremap nand flash.\n");
121 /* Allocate memory for MTD device structure and private data */
122 h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
123 if (!h1910_nand_mtd) {
124 printk("Unable to allocate h1910 NAND MTD device structure.\n");
125 iounmap((void *)nandaddr);
129 /* Get pointer to private data */
130 this = (struct nand_chip *)(&h1910_nand_mtd[1]);
132 /* Initialize structures */
133 memset(h1910_nand_mtd, 0, sizeof(struct mtd_info));
134 memset(this, 0, sizeof(struct nand_chip));
136 /* Link the private data with the MTD structure */
137 h1910_nand_mtd->priv = this;
138 h1910_nand_mtd->owner = THIS_MODULE;
143 GPSR(37) = GPIO_bit(37);
145 /* insert callbacks */
146 this->IO_ADDR_R = nandaddr;
147 this->IO_ADDR_W = nandaddr;
148 this->hwcontrol = h1910_hwcontrol;
149 this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */
150 /* 15 us command delay time */
151 this->chip_delay = 50;
152 this->eccmode = NAND_ECC_SOFT;
153 this->options = NAND_NO_AUTOINCR;
155 /* Scan to find existence of the device */
156 if (nand_scan(h1910_nand_mtd, 1)) {
157 printk(KERN_NOTICE "No NAND device - returning -ENXIO\n");
158 kfree(h1910_nand_mtd);
159 iounmap((void *)nandaddr);
162 #ifdef CONFIG_MTD_CMDLINE_PARTS
163 mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, "h1910-nand");
164 if (mtd_parts_nb > 0)
165 part_type = "command line";
169 if (mtd_parts_nb == 0) {
170 mtd_parts = partition_info;
171 mtd_parts_nb = NUM_PARTITIONS;
172 part_type = "static";
175 /* Register the partitions */
176 printk(KERN_NOTICE "Using %s partition definition\n", part_type);
177 add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb);
183 module_init(h1910_init);
188 static void __exit h1910_cleanup(void)
190 struct nand_chip *this = (struct nand_chip *)&h1910_nand_mtd[1];
192 /* Release resources, unregister device */
193 nand_release(h1910_nand_mtd);
195 /* Release io resource */
196 iounmap((void *)this->IO_ADDR_W);
198 /* Free the MTD device structure */
199 kfree(h1910_nand_mtd);
202 module_exit(h1910_cleanup);
204 MODULE_LICENSE("GPL");
205 MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
206 MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");