aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/nand/autcpu12.c
blob: 7c95da1f612cd0ff4bc9961af433425d5a680998 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/*
 *  drivers/mtd/autcpu12.c
 *
 *  Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
 *
 *  Derived from drivers/mtd/spia.c
 *	 Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Overview:
 *   This is a device driver for the NAND flash device found on the
 *   autronix autcpu12 board, which is a SmartMediaCard. It supports
 *   16MiB, 32MiB and 64MiB cards.
 *
 *
 *	02-12-2002 TG	Cleanup of module params
 *
 *	02-20-2002 TG	adjusted for different rd/wr address support
 *			added support for read device ready/busy line
 *			added page_cache
 *
 *	10-06-2002 TG	128K card support added
 */

#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
#include <mach/hardware.h>
#include <asm/sizes.h>
#include <mach/autcpu12.h>

/*
 * MTD structure for AUTCPU12 board
 */
static struct mtd_info *autcpu12_mtd = NULL;
static void __iomem *autcpu12_fio_base;

/*
 * Define partitions for flash devices
 */
static struct mtd_partition partition_info16k[] = {
	{ .name		= "AUTCPU12 flash partition 1",
	  .offset	= 0,
	  .size		= 8 * SZ_1M },
	{ .name		= "AUTCPU12 flash partition 2",
	  .offset	= 8 * SZ_1M,
	  .size		= 8 * SZ_1M },
};

static struct mtd_partition partition_info32k[] = {
	{ .name		= "AUTCPU12 flash partition 1",
	  .offset	= 0,
	  .size		= 8 * SZ_1M },
	{ .name		= "AUTCPU12 flash partition 2",
	  .offset	= 8 * SZ_1M,
	  .size		= 24 * SZ_1M },
};

static struct mtd_partition partition_info64k[] = {
	{ .name		= "AUTCPU12 flash partition 1",
	  .offset	= 0,
	  .size		= 16 * SZ_1M },
	{ .name		= "AUTCPU12 flash partition 2",
	  .offset	= 16 * SZ_1M,
	  .size		= 48 * SZ_1M },
};

static struct mtd_partition partition_info128k[] = {
	{ .name		= "AUTCPU12 flash partition 1",
	  .offset	= 0,
	  .size		= 16 * SZ_1M },
	{ .name		= "AUTCPU12 flash partition 2",
	  .offset	= 16 * SZ_1M,
	  .size		= 112 * SZ_1M },
};

#define NUM_PARTITIONS16K 2
#define NUM_PARTITIONS32K 2
#define NUM_PARTITIONS64K 2
#define NUM_PARTITIONS128K 2
/*
 *	hardware specific access to control-lines
 *
 *	ALE bit 4 autcpu12_pedr
 *	CLE bit 5 autcpu12_pedr
 *	NCE bit 0 fio_ctrl
 *
 */
static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd,
			       unsigned int ctrl)
{
	struct nand_chip *chip = mtd->priv;

	if (ctrl & NAND_CTRL_CHANGE) {
		void __iomem *addr;
		unsigned char bits;

		addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
		bits = (ctrl & NAND_CLE) << 4;
		bits |= (ctrl & NAND_ALE) << 2;
		writeb((readb(addr) & ~0x30) | bits, addr);

		addr = autcpu12_fio_base + AUTCPU12_SMC_SELECT_OFFSET;
		writeb((readb(addr) & ~0x1) | (ctrl & NAND_NCE), addr);
	}

	if (cmd != NAND_CMD_NONE)
		writeb(cmd, chip->IO_ADDR_W);
}

/*
 *	read device ready pin
 */
int autcpu12_device_ready(struct mtd_info *mtd)
{
	void __iomem *addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;

	return readb(addr) & AUTCPU12_SMC_RDY;
}

/*
 * Main initialization routine
 */
static int __init autcpu12_init(void)
{
	struct nand_chip *this;
	int err = 0;

	/* Allocate memory for MTD device structure and private data */
	autcpu12_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
			       GFP_KERNEL);
	if (!autcpu12_mtd) {
		printk("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
		err = -ENOMEM;
		goto out;
	}

	/* map physical address */
	autcpu12_fio_base = ioremap(AUTCPU12_PHYS_SMC, SZ_1K);
	if (!autcpu12_fio_base) {
		printk("Ioremap autcpu12 SmartMedia Card failed\n");
		err = -EIO;
		goto out_mtd;
	}

	/* Get pointer to private data */
	this = (struct nand_chip *)(&autcpu12_mtd[1]);

	/* Initialize structures */
	memset(autcpu12_mtd, 0, sizeof(struct mtd_info));
	memset(this, 0, sizeof(struct nand_chip));

	/* Link the private data with the MTD structure */
	autcpu12_mtd->priv = this;
	autcpu12_mtd->owner = THIS_MODULE;

	/* Set address of NAND IO lines */
	this->IO_ADDR_R = autcpu12_fio_base;
	this->IO_ADDR_W = autcpu12_fio_base;
	this->cmd_ctrl = autcpu12_hwcontrol;
	this->dev_ready = autcpu12_device_ready;
	/* 20 us command delay time */
	this->chip_delay = 20;
	this->ecc.mode = NAND_ECC_SOFT;

	/* Enable the following for a flash based bad block table */
	/*
	   this->options = NAND_USE_FLASH_BBT;
	 */
	this->options = NAND_USE_FLASH_BBT;

	/* Scan to find existance of the device */
	if (nand_scan(autcpu12_mtd, 1)) {
		err = -ENXIO;
		goto out_ior;
	}

	/* Register the partitions */
	switch (autcpu12_mtd->size) {
		case SZ_16M:
			add_mtd_partitions(autcpu12_mtd, partition_info16k,
					   NUM_PARTITIONS16K);
			break;
		case SZ_32M:
			add_mtd_partitions(autcpu12_mtd, partition_info32k,
					   NUM_PARTITIONS32K);
			break;
		case SZ_64M:
			add_mtd_partitions(autcpu12_mtd, partition_info64k,
					   NUM_PARTITIONS64K);
			break;
		case SZ_128M:
			add_mtd_partitions(autcpu12_mtd, partition_info128k,
					   NUM_PARTITIONS128K);
			break;
		default:
			printk("Unsupported SmartMedia device\n");
			err = -ENXIO;
			goto out_ior;
	}
	goto out;

 out_ior:
	iounmap(autcpu12_fio_base);
 out_mtd:
	kfree(autcpu12_mtd);
 out:
	return err;
}

module_init(autcpu12_init);

/*
 * Clean up routine
 */
static void __exit autcpu12_cleanup(void)
{
	/* Release resources, unregister device */
	nand_release(autcpu12_mtd);

	/* unmap physical address */
	iounmap(autcpu12_fio_base);

	/* Free the MTD device structure */
	kfree(autcpu12_mtd);
}

module_exit(autcpu12_cleanup);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");