Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
[linux-2.6] / drivers / mtd / nand / autcpu12.c
1 /*
2  *  drivers/mtd/autcpu12.c
3  *
4  *  Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>
5  *
6  *  Derived from drivers/mtd/spia.c
7  *       Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
8  *
9  * $Id: autcpu12.c,v 1.23 2005/11/07 11:14:30 gleixner Exp $
10  *
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.
14  *
15  *  Overview:
16  *   This is a device driver for the NAND flash device found on the
17  *   autronix autcpu12 board, which is a SmartMediaCard. It supports
18  *   16MiB, 32MiB and 64MiB cards.
19  *
20  *
21  *      02-12-2002 TG   Cleanup of module params
22  *
23  *      02-20-2002 TG   adjusted for different rd/wr address support
24  *                      added support for read device ready/busy line
25  *                      added page_cache
26  *
27  *      10-06-2002 TG   128K card support added
28  */
29
30 #include <linux/slab.h>
31 #include <linux/init.h>
32 #include <linux/module.h>
33 #include <linux/mtd/mtd.h>
34 #include <linux/mtd/nand.h>
35 #include <linux/mtd/partitions.h>
36 #include <asm/io.h>
37 #include <asm/arch/hardware.h>
38 #include <asm/sizes.h>
39 #include <asm/arch/autcpu12.h>
40
41 /*
42  * MTD structure for AUTCPU12 board
43  */
44 static struct mtd_info *autcpu12_mtd = NULL;
45 static void __iomem *autcpu12_fio_base;
46
47 /*
48  * Define partitions for flash devices
49  */
50 static struct mtd_partition partition_info16k[] = {
51         { .name         = "AUTCPU12 flash partition 1",
52           .offset       = 0,
53           .size         = 8 * SZ_1M },
54         { .name         = "AUTCPU12 flash partition 2",
55           .offset       = 8 * SZ_1M,
56           .size         = 8 * SZ_1M },
57 };
58
59 static struct mtd_partition partition_info32k[] = {
60         { .name         = "AUTCPU12 flash partition 1",
61           .offset       = 0,
62           .size         = 8 * SZ_1M },
63         { .name         = "AUTCPU12 flash partition 2",
64           .offset       = 8 * SZ_1M,
65           .size         = 24 * SZ_1M },
66 };
67
68 static struct mtd_partition partition_info64k[] = {
69         { .name         = "AUTCPU12 flash partition 1",
70           .offset       = 0,
71           .size         = 16 * SZ_1M },
72         { .name         = "AUTCPU12 flash partition 2",
73           .offset       = 16 * SZ_1M,
74           .size         = 48 * SZ_1M },
75 };
76
77 static struct mtd_partition partition_info128k[] = {
78         { .name         = "AUTCPU12 flash partition 1",
79           .offset       = 0,
80           .size         = 16 * SZ_1M },
81         { .name         = "AUTCPU12 flash partition 2",
82           .offset       = 16 * SZ_1M,
83           .size         = 112 * SZ_1M },
84 };
85
86 #define NUM_PARTITIONS16K 2
87 #define NUM_PARTITIONS32K 2
88 #define NUM_PARTITIONS64K 2
89 #define NUM_PARTITIONS128K 2
90 /*
91  *      hardware specific access to control-lines
92  *
93  *      ALE bit 4 autcpu12_pedr
94  *      CLE bit 5 autcpu12_pedr
95  *      NCE bit 0 fio_ctrl
96  *
97  */
98 static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd,
99                                unsigned int ctrl)
100 {
101         struct nand_chip *chip = mtd->priv;
102
103         if (ctrl & NAND_CTRL_CHANGE) {
104                 void __iomem *addr;
105                 unsigned char bits;
106
107                 addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
108                 bits = (ctrl & NAND_CLE) << 4;
109                 bits |= (ctrl & NAND_ALE) << 2;
110                 writeb((readb(addr) & ~0x30) | bits, addr);
111
112                 addr = autcpu12_fio_base + AUTCPU12_SMC_SELECT_OFFSET;
113                 writeb((readb(addr) & ~0x1) | (ctrl & NAND_NCE), addr);
114         }
115
116         if (cmd != NAND_CMD_NONE)
117                 writeb(cmd, chip->IO_ADDR_W);
118 }
119
120 /*
121  *      read device ready pin
122  */
123 int autcpu12_device_ready(struct mtd_info *mtd)
124 {
125         void __iomem *addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;
126
127         return readb(addr) & AUTCPU12_SMC_RDY;
128 }
129
130 /*
131  * Main initialization routine
132  */
133 static int __init autcpu12_init(void)
134 {
135         struct nand_chip *this;
136         int err = 0;
137
138         /* Allocate memory for MTD device structure and private data */
139         autcpu12_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),
140                                GFP_KERNEL);
141         if (!autcpu12_mtd) {
142                 printk("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
143                 err = -ENOMEM;
144                 goto out;
145         }
146
147         /* map physical address */
148         autcpu12_fio_base = ioremap(AUTCPU12_PHYS_SMC, SZ_1K);
149         if (!autcpu12_fio_base) {
150                 printk("Ioremap autcpu12 SmartMedia Card failed\n");
151                 err = -EIO;
152                 goto out_mtd;
153         }
154
155         /* Get pointer to private data */
156         this = (struct nand_chip *)(&autcpu12_mtd[1]);
157
158         /* Initialize structures */
159         memset(autcpu12_mtd, 0, sizeof(struct mtd_info));
160         memset(this, 0, sizeof(struct nand_chip));
161
162         /* Link the private data with the MTD structure */
163         autcpu12_mtd->priv = this;
164         autcpu12_mtd->owner = THIS_MODULE;
165
166         /* Set address of NAND IO lines */
167         this->IO_ADDR_R = autcpu12_fio_base;
168         this->IO_ADDR_W = autcpu12_fio_base;
169         this->cmd_ctrl = autcpu12_hwcontrol;
170         this->dev_ready = autcpu12_device_ready;
171         /* 20 us command delay time */
172         this->chip_delay = 20;
173         this->ecc.mode = NAND_ECC_SOFT;
174
175         /* Enable the following for a flash based bad block table */
176         /*
177            this->options = NAND_USE_FLASH_BBT;
178          */
179         this->options = NAND_USE_FLASH_BBT;
180
181         /* Scan to find existance of the device */
182         if (nand_scan(autcpu12_mtd, 1)) {
183                 err = -ENXIO;
184                 goto out_ior;
185         }
186
187         /* Register the partitions */
188         switch (autcpu12_mtd->size) {
189                 case SZ_16M:
190                         add_mtd_partitions(autcpu12_mtd, partition_info16k,
191                                            NUM_PARTITIONS16K);
192                         break;
193                 case SZ_32M:
194                         add_mtd_partitions(autcpu12_mtd, partition_info32k,
195                                            NUM_PARTITIONS32K);
196                         break;
197                 case SZ_64M:
198                         add_mtd_partitions(autcpu12_mtd, partition_info64k,
199                                            NUM_PARTITIONS64K);
200                         break;
201                 case SZ_128M:
202                         add_mtd_partitions(autcpu12_mtd, partition_info128k,
203                                            NUM_PARTITIONS128K);
204                         break;
205                 default:
206                         printk("Unsupported SmartMedia device\n");
207                         err = -ENXIO;
208                         goto out_ior;
209         }
210         goto out;
211
212  out_ior:
213         iounmap(autcpu12_fio_base);
214  out_mtd:
215         kfree(autcpu12_mtd);
216  out:
217         return err;
218 }
219
220 module_init(autcpu12_init);
221
222 /*
223  * Clean up routine
224  */
225 static void __exit autcpu12_cleanup(void)
226 {
227         /* Release resources, unregister device */
228         nand_release(autcpu12_mtd);
229
230         /* unmap physical address */
231         iounmap(autcpu12_fio_base);
232
233         /* Free the MTD device structure */
234         kfree(autcpu12_mtd);
235 }
236
237 module_exit(autcpu12_cleanup);
238
239 MODULE_LICENSE("GPL");
240 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
241 MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");