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 * NAND_NCE: bit 0 - don't care
61 * NAND_CLE: bit 1 - address bit 2
62 * NAND_ALE: bit 2 - address bit 3
64 static void h1910_hwcontrol(struct mtd_info *mtd, int cmd,
67 struct nand_chip *chip = mtd->priv;
69 if (cmd != NAND_CMD_NONE)
70 writeb(cmd, chip->IO_ADDR_W | ((ctrl & 0x6) << 1));
74 * read device ready pin
77 static int h1910_device_ready(struct mtd_info *mtd)
79 return (GPLR(55) & GPIO_bit(55));
84 * Main initialization routine
86 static int __init h1910_init(void)
88 struct nand_chip *this;
89 const char *part_type = 0;
91 struct mtd_partition *mtd_parts = 0;
92 void __iomem *nandaddr;
94 if (!machine_is_h1900())
97 nandaddr = ioremap(0x08000000, 0x1000);
99 printk("Failed to ioremap nand flash.\n");
103 /* Allocate memory for MTD device structure and private data */
104 h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);
105 if (!h1910_nand_mtd) {
106 printk("Unable to allocate h1910 NAND MTD device structure.\n");
107 iounmap((void *)nandaddr);
111 /* Get pointer to private data */
112 this = (struct nand_chip *)(&h1910_nand_mtd[1]);
114 /* Initialize structures */
115 memset(h1910_nand_mtd, 0, sizeof(struct mtd_info));
116 memset(this, 0, sizeof(struct nand_chip));
118 /* Link the private data with the MTD structure */
119 h1910_nand_mtd->priv = this;
120 h1910_nand_mtd->owner = THIS_MODULE;
125 GPSR(37) = GPIO_bit(37);
127 /* insert callbacks */
128 this->IO_ADDR_R = nandaddr;
129 this->IO_ADDR_W = nandaddr;
130 this->cmd_ctrl = h1910_hwcontrol;
131 this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */
132 /* 15 us command delay time */
133 this->chip_delay = 50;
134 this->ecc.mode = NAND_ECC_SOFT;
135 this->options = NAND_NO_AUTOINCR;
137 /* Scan to find existence of the device */
138 if (nand_scan(h1910_nand_mtd, 1)) {
139 printk(KERN_NOTICE "No NAND device - returning -ENXIO\n");
140 kfree(h1910_nand_mtd);
141 iounmap((void *)nandaddr);
144 #ifdef CONFIG_MTD_CMDLINE_PARTS
145 mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, "h1910-nand");
146 if (mtd_parts_nb > 0)
147 part_type = "command line";
151 if (mtd_parts_nb == 0) {
152 mtd_parts = partition_info;
153 mtd_parts_nb = NUM_PARTITIONS;
154 part_type = "static";
157 /* Register the partitions */
158 printk(KERN_NOTICE "Using %s partition definition\n", part_type);
159 add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb);
165 module_init(h1910_init);
170 static void __exit h1910_cleanup(void)
172 struct nand_chip *this = (struct nand_chip *)&h1910_nand_mtd[1];
174 /* Release resources, unregister device */
175 nand_release(h1910_nand_mtd);
177 /* Release io resource */
178 iounmap((void *)this->IO_ADDR_W);
180 /* Free the MTD device structure */
181 kfree(h1910_nand_mtd);
184 module_exit(h1910_cleanup);
186 MODULE_LICENSE("GPL");
187 MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
188 MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");