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 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 * This is a device driver for the NAND flash device found on the
16 * iPAQ h1910 board which utilizes the Samsung K9F2808 part. This is
17 * a 128Mibit (16MiB x 8 bits) NAND flash device.
20 #include <linux/slab.h>
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/nand.h>
25 #include <linux/mtd/partitions.h>
27 #include <mach/hardware.h> /* for CLPS7111_VIRT_BASE */
28 #include <asm/sizes.h>
29 #include <mach/h1900-gpio.h>
30 #include <mach/ipaq.h>
33 * MTD structure for EDB7312 board
35 static struct mtd_info
*h1910_nand_mtd
= NULL
;
41 #ifdef CONFIG_MTD_PARTITIONS
43 * Define static partitions for flash device
45 static struct mtd_partition partition_info
[] = {
46 {name
:"h1910 NAND Flash",
48 size
:16 * 1024 * 1024}
51 #define NUM_PARTITIONS 1
56 * hardware specific access to control-lines
58 * NAND_NCE: bit 0 - don't care
59 * NAND_CLE: bit 1 - address bit 2
60 * NAND_ALE: bit 2 - address bit 3
62 static void h1910_hwcontrol(struct mtd_info
*mtd
, int cmd
,
65 struct nand_chip
*chip
= mtd
->priv
;
67 if (cmd
!= NAND_CMD_NONE
)
68 writeb(cmd
, chip
->IO_ADDR_W
| ((ctrl
& 0x6) << 1));
72 * read device ready pin
76 * Main initialization routine
78 static int __init
h1910_init(void)
80 struct nand_chip
*this;
81 const char *part_type
= 0;
83 struct mtd_partition
*mtd_parts
= 0;
84 void __iomem
*nandaddr
;
86 if (!machine_is_h1900())
89 nandaddr
= ioremap(0x08000000, 0x1000);
91 printk("Failed to ioremap nand flash.\n");
95 /* Allocate memory for MTD device structure and private data */
96 h1910_nand_mtd
= kmalloc(sizeof(struct mtd_info
) + sizeof(struct nand_chip
), GFP_KERNEL
);
97 if (!h1910_nand_mtd
) {
98 printk("Unable to allocate h1910 NAND MTD device structure.\n");
99 iounmap((void *)nandaddr
);
103 /* Get pointer to private data */
104 this = (struct nand_chip
*)(&h1910_nand_mtd
[1]);
106 /* Initialize structures */
107 memset(h1910_nand_mtd
, 0, sizeof(struct mtd_info
));
108 memset(this, 0, sizeof(struct nand_chip
));
110 /* Link the private data with the MTD structure */
111 h1910_nand_mtd
->priv
= this;
112 h1910_nand_mtd
->owner
= THIS_MODULE
;
117 GPSR(37) = GPIO_bit(37);
119 /* insert callbacks */
120 this->IO_ADDR_R
= nandaddr
;
121 this->IO_ADDR_W
= nandaddr
;
122 this->cmd_ctrl
= h1910_hwcontrol
;
123 this->dev_ready
= NULL
; /* unknown whether that was correct or not so we will just do it like this */
124 /* 15 us command delay time */
125 this->chip_delay
= 50;
126 this->ecc
.mode
= NAND_ECC_SOFT
;
127 this->options
= NAND_NO_AUTOINCR
;
129 /* Scan to find existence of the device */
130 if (nand_scan(h1910_nand_mtd
, 1)) {
131 printk(KERN_NOTICE
"No NAND device - returning -ENXIO\n");
132 kfree(h1910_nand_mtd
);
133 iounmap((void *)nandaddr
);
136 #ifdef CONFIG_MTD_CMDLINE_PARTS
137 mtd_parts_nb
= parse_cmdline_partitions(h1910_nand_mtd
, &mtd_parts
, "h1910-nand");
138 if (mtd_parts_nb
> 0)
139 part_type
= "command line";
143 if (mtd_parts_nb
== 0) {
144 mtd_parts
= partition_info
;
145 mtd_parts_nb
= NUM_PARTITIONS
;
146 part_type
= "static";
149 /* Register the partitions */
150 printk(KERN_NOTICE
"Using %s partition definition\n", part_type
);
151 add_mtd_partitions(h1910_nand_mtd
, mtd_parts
, mtd_parts_nb
);
157 module_init(h1910_init
);
162 static void __exit
h1910_cleanup(void)
164 struct nand_chip
*this = (struct nand_chip
*)&h1910_nand_mtd
[1];
166 /* Release resources, unregister device */
167 nand_release(h1910_nand_mtd
);
169 /* Release io resource */
170 iounmap((void *)this->IO_ADDR_W
);
172 /* Free the MTD device structure */
173 kfree(h1910_nand_mtd
);
176 module_exit(h1910_cleanup
);
178 MODULE_LICENSE("GPL");
179 MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");
180 MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");