2 * drivers/mtd/nand/edb7312.c
4 * Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
6 * Derived from drivers/mtd/nand/autcpu12.c
7 * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
9 * $Id: edb7312.c,v 1.12 2005/11/07 11:14:30 gleixner Exp $
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 * This is a device driver for the NAND flash device found on the
17 * CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is
18 * a 64Mibit (8MiB x 8 bits) NAND flash device.
21 #include <linux/slab.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/mtd/mtd.h>
25 #include <linux/mtd/nand.h>
26 #include <linux/mtd/partitions.h>
28 #include <asm/arch/hardware.h> /* for CLPS7111_VIRT_BASE */
29 #include <asm/sizes.h>
30 #include <asm/hardware/clps7111.h>
33 * MTD structure for EDB7312 board
35 static struct mtd_info
*ep7312_mtd
= NULL
;
38 * Values specific to the EDB7312 board (used with EP7312 processor)
40 #define EP7312_FIO_PBASE 0x10000000 /* Phys address of flash */
41 #define EP7312_PXDR 0x0001 /*
42 * IO offset to Port B data register
43 * where the CLE, ALE and NCE pins
46 #define EP7312_PXDDR 0x0041 /*
47 * IO offset to Port B data direction
48 * register so we can control the IO
56 static unsigned long ep7312_fio_pbase
= EP7312_FIO_PBASE
;
57 static void __iomem
*ep7312_pxdr
= (void __iomem
*)EP7312_PXDR
;
58 static void __iomem
*ep7312_pxddr
= (void __iomem
*)EP7312_PXDDR
;
60 #ifdef CONFIG_MTD_PARTITIONS
62 * Define static partitions for flash device
64 static struct mtd_partition partition_info
[] = {
65 {.name
= "EP7312 Nand Flash",
67 .size
= 8 * 1024 * 1024}
70 #define NUM_PARTITIONS 1
75 * hardware specific access to control-lines
77 * NAND_NCE: bit 0 -> bit 6 (bit 7 = 1)
78 * NAND_CLE: bit 1 -> bit 4
79 * NAND_ALE: bit 2 -> bit 5
81 static void ep7312_hwcontrol(struct mtd_info
*mtd
, int cmd
, unsigned int ctrl
)
83 struct nand_chip
*chip
= mtd
->priv
;
85 if (ctrl
& NAND_CTRL_CHANGE
) {
86 unsigned char bits
= 0x80;
88 bits
|= (ctrl
& (NAND_CLE
| NAND_ALE
)) << 3;
89 bits
|= (ctrl
& NAND_NCE
) ? 0x00 : 0x40;
91 clps_writeb((clps_readb(ep7312_pxdr
) & 0xF0) | bits
,
94 if (cmd
!= NAND_CMD_NONE
)
95 writeb(cmd
, chip
->IO_ADDR_W
);
99 * read device ready pin
101 static int ep7312_device_ready(struct mtd_info
*mtd
)
106 #ifdef CONFIG_MTD_PARTITIONS
107 const char *part_probes
[] = { "cmdlinepart", NULL
};
111 * Main initialization routine
113 static int __init
ep7312_init(void)
115 struct nand_chip
*this;
116 const char *part_type
= 0;
117 int mtd_parts_nb
= 0;
118 struct mtd_partition
*mtd_parts
= 0;
119 void __iomem
*ep7312_fio_base
;
121 /* Allocate memory for MTD device structure and private data */
122 ep7312_mtd
= kmalloc(sizeof(struct mtd_info
) + sizeof(struct nand_chip
), GFP_KERNEL
);
124 printk("Unable to allocate EDB7312 NAND MTD device structure.\n");
128 /* map physical adress */
129 ep7312_fio_base
= ioremap(ep7312_fio_pbase
, SZ_1K
);
130 if (!ep7312_fio_base
) {
131 printk("ioremap EDB7312 NAND flash failed\n");
136 /* Get pointer to private data */
137 this = (struct nand_chip
*)(&ep7312_mtd
[1]);
139 /* Initialize structures */
140 memset(ep7312_mtd
, 0, sizeof(struct mtd_info
));
141 memset(this, 0, sizeof(struct nand_chip
));
143 /* Link the private data with the MTD structure */
144 ep7312_mtd
->priv
= this;
145 ep7312_mtd
->owner
= THIS_MODULE
;
148 * Set GPIO Port B control register so that the pins are configured
149 * to be outputs for controlling the NAND flash.
151 clps_writeb(0xf0, ep7312_pxddr
);
153 /* insert callbacks */
154 this->IO_ADDR_R
= ep7312_fio_base
;
155 this->IO_ADDR_W
= ep7312_fio_base
;
156 this->cmd_ctrl
= ep7312_hwcontrol
;
157 this->dev_ready
= ep7312_device_ready
;
158 /* 15 us command delay time */
159 this->chip_delay
= 15;
161 /* Scan to find existence of the device */
162 if (nand_scan(ep7312_mtd
, 1)) {
163 iounmap((void *)ep7312_fio_base
);
167 #ifdef CONFIG_MTD_PARTITIONS
168 ep7312_mtd
->name
= "edb7312-nand";
169 mtd_parts_nb
= parse_mtd_partitions(ep7312_mtd
, part_probes
, &mtd_parts
, 0);
170 if (mtd_parts_nb
> 0)
171 part_type
= "command line";
175 if (mtd_parts_nb
== 0) {
176 mtd_parts
= partition_info
;
177 mtd_parts_nb
= NUM_PARTITIONS
;
178 part_type
= "static";
181 /* Register the partitions */
182 printk(KERN_NOTICE
"Using %s partition definition\n", part_type
);
183 add_mtd_partitions(ep7312_mtd
, mtd_parts
, mtd_parts_nb
);
189 module_init(ep7312_init
);
194 static void __exit
ep7312_cleanup(void)
196 struct nand_chip
*this = (struct nand_chip
*)&ep7312_mtd
[1];
198 /* Release resources, unregister device */
199 nand_release(ap7312_mtd
);
201 /* Release io resource */
202 iounmap(this->IO_ADDR_R
);
204 /* Free the MTD device structure */
208 module_exit(ep7312_cleanup
);
210 MODULE_LICENSE("GPL");
211 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
212 MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");