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;
142 GPSR(37) = GPIO_bit(37);
144 /* insert callbacks */
145 this->IO_ADDR_R
= nandaddr
;
146 this->IO_ADDR_W
= nandaddr
;
147 this->hwcontrol
= h1910_hwcontrol
;
148 this->dev_ready
= NULL
; /* unknown whether that was correct or not so we will just do it like this */
149 /* 15 us command delay time */
150 this->chip_delay
= 50;
151 this->eccmode
= NAND_ECC_SOFT
;
152 this->options
= NAND_NO_AUTOINCR
;
154 /* Scan to find existence of the device */
155 if (nand_scan(h1910_nand_mtd
, 1)) {
156 printk(KERN_NOTICE
"No NAND device - returning -ENXIO\n");
157 kfree(h1910_nand_mtd
);
158 iounmap((void *)nandaddr
);
161 #ifdef CONFIG_MTD_CMDLINE_PARTS
162 mtd_parts_nb
= parse_cmdline_partitions(h1910_nand_mtd
, &mtd_parts
, "h1910-nand");
163 if (mtd_parts_nb
> 0)
164 part_type
= "command line";
168 if (mtd_parts_nb
== 0) {
169 mtd_parts
= partition_info
;
170 mtd_parts_nb
= NUM_PARTITIONS
;
171 part_type
= "static";
174 /* Register the partitions */
175 printk(KERN_NOTICE
"Using %s partition definition\n", part_type
);
176 add_mtd_partitions(h1910_nand_mtd
, mtd_parts
, mtd_parts_nb
);
182 module_init(h1910_init
);
187 static void __exit
h1910_cleanup(void)
189 struct nand_chip
*this = (struct nand_chip
*)&h1910_nand_mtd
[1];
191 /* Release resources, unregister device */
192 nand_release(h1910_nand_mtd
);
194 /* Release io resource */
195 iounmap((void *)this->IO_ADDR_W
);
197 /* Free the MTD device structure */
198 kfree(h1910_nand_mtd
);
201 module_exit(h1910_cleanup
);
203 MODULE_LICENSE("GPL");
204 MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
205 MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");