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