2 * drivers/mtd/nand/toto.c
4 * Copyright (c) 2003 Texas Instruments
6 * Derived from drivers/mtd/autcpu12.c
8 * Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.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 * TI fido board. It supports 32MiB and 64MiB cards
18 * $Id: toto.c,v 1.5 2005/11/07 11:14:31 gleixner Exp $
21 #include <linux/slab.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/delay.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>
30 #include <asm/sizes.h>
31 #include <asm/arch/toto.h>
32 #include <asm/arch-omap1510/hardware.h>
33 #include <asm/arch/gpio.h>
35 #define CONFIG_NAND_WORKAROUND 1
38 * MTD structure for TOTO board
40 static struct mtd_info
*toto_mtd
= NULL
;
42 static unsigned long toto_io_base
= OMAP_FLASH_1_BASE
;
45 * Define partitions for flash devices
48 static struct mtd_partition partition_info64M
[] = {
49 { .name
= "toto kernel partition 1",
52 { .name
= "toto file sys partition 2",
55 { .name
= "toto user partition 3",
58 { .name
= "toto devboard extra partition 4",
63 static struct mtd_partition partition_info32M
[] = {
64 { .name
= "toto kernel partition 1",
67 { .name
= "toto file sys partition 2",
70 { .name
= "toto user partition 3",
75 #define NUM_PARTITIONS32M 3
76 #define NUM_PARTITIONS64M 4
79 * hardware specific access to control-lines
82 * NAND_NCE: bit 0 -> bit 14 (0x4000)
83 * NAND_CLE: bit 1 -> bit 12 (0x1000)
84 * NAND_ALE: bit 2 -> bit 1 (0x0002)
86 static void toto_hwcontrol(struct mtd_info
*mtd
, int cmd
,
89 struct nand_chip
*chip
= mtd
->priv
;
91 if (ctrl
& NAND_CTRL_CHANGE
) {
94 /* hopefully enough time for tc make proceding write to clear */
97 bits
= (~ctrl
& NAND_NCE
) << 14;
98 bits
|= (ctrl
& NAND_CLE
) << 12;
99 bits
|= (ctrl
& NAND_ALE
) >> 1;
101 #warning Wild guess as gpiosetout() is nowhere defined in the kernel source - tglx
102 gpiosetout(0x5002, bits
);
104 #ifdef CONFIG_NAND_WORKAROUND
105 /* "some" dev boards busted, blue wired to rts2 :( */
106 rts2setout(2, (ctrl
& NAND_CLE
) << 1);
108 /* allow time to ensure gpio state to over take memory write */
112 if (cmd
!= NAND_CMD_NONE
)
113 writeb(cmd
, chip
->IO_ADDR_W
);
117 * Main initialization routine
119 static int __init
toto_init(void)
121 struct nand_chip
*this;
124 /* Allocate memory for MTD device structure and private data */
125 toto_mtd
= kmalloc(sizeof(struct mtd_info
) + sizeof(struct nand_chip
), GFP_KERNEL
);
127 printk(KERN_WARNING
"Unable to allocate toto NAND MTD device structure.\n");
132 /* Get pointer to private data */
133 this = (struct nand_chip
*)(&toto_mtd
[1]);
135 /* Initialize structures */
136 memset(toto_mtd
, 0, sizeof(struct mtd_info
));
137 memset(this, 0, sizeof(struct nand_chip
));
139 /* Link the private data with the MTD structure */
140 toto_mtd
->priv
= this;
141 toto_mtd
->owner
= THIS_MODULE
;
143 /* Set address of NAND IO lines */
144 this->IO_ADDR_R
= toto_io_base
;
145 this->IO_ADDR_W
= toto_io_base
;
146 this->cmd_ctrl
= toto_hwcontrol
;
147 this->dev_ready
= NULL
;
148 /* 25 us command delay time */
149 this->chip_delay
= 30;
150 this->ecc
.mode
= NAND_ECC_SOFT
;
152 /* Scan to find existance of the device */
153 if (nand_scan(toto_mtd
, 1)) {
158 /* Register the partitions */
159 switch (toto_mtd
->size
) {
161 add_mtd_partitions(toto_mtd
, partition_info64M
, NUM_PARTITIONS64M
);
164 add_mtd_partitions(toto_mtd
, partition_info32M
, NUM_PARTITIONS32M
);
167 printk(KERN_WARNING
"Unsupported Nand device\n");
173 gpioreserve(NAND_MASK
); /* claim our gpios */
174 archflashwp(0, 0); /* open up flash for writing */
184 module_init(toto_init
);
189 static void __exit
toto_cleanup(void)
191 /* Release resources, unregister device */
192 nand_release(toto_mtd
);
194 /* Free the MTD device structure */
197 /* stop flash writes */
200 /* release gpios to system */
201 gpiorelease(NAND_MASK
);
204 module_exit(toto_cleanup
);
206 MODULE_LICENSE("GPL");
207 MODULE_AUTHOR("Richard Woodruff <r-woodruff2@ti.com>");
208 MODULE_DESCRIPTION("Glue layer for NAND flash on toto board");