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[linux-2.6-omap-h63xx.git] / 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 adress 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/version.h>
31 #include <linux/slab.h>
32 #include <linux/init.h>
33 #include <linux/module.h>
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/nand.h>
36 #include <linux/mtd/partitions.h>
37 #include <asm/io.h>
38 #include <asm/arch/hardware.h>
39 #include <asm/sizes.h>
40 #include <asm/arch/autcpu12.h>
41
42 /*
43  * MTD structure for AUTCPU12 board
44  */
45 static struct mtd_info *autcpu12_mtd = NULL;
46
47 static int autcpu12_io_base = CS89712_VIRT_BASE;
48 static int autcpu12_fio_pbase = AUTCPU12_PHYS_SMC;
49 static int autcpu12_fio_ctrl = AUTCPU12_SMC_SELECT_OFFSET;
50 static int autcpu12_pedr = AUTCPU12_SMC_PORT_OFFSET;
51 static void __iomem * autcpu12_fio_base;
52
53 /*
54  * Define partitions for flash devices
55  */
56 static struct mtd_partition partition_info16k[] = {
57         { .name         = "AUTCPU12 flash partition 1",
58           .offset       = 0,
59           .size         = 8 * SZ_1M },
60         { .name         = "AUTCPU12 flash partition 2",
61           .offset       = 8 * SZ_1M,
62           .size         = 8 * SZ_1M },
63 };
64
65 static struct mtd_partition partition_info32k[] = {
66         { .name         = "AUTCPU12 flash partition 1",
67           .offset       = 0,
68           .size         = 8 * SZ_1M },
69         { .name         = "AUTCPU12 flash partition 2",
70           .offset       = 8 * SZ_1M,
71           .size         = 24 * SZ_1M },
72 };
73
74 static struct mtd_partition partition_info64k[] = {
75         { .name         = "AUTCPU12 flash partition 1",
76           .offset       = 0,
77           .size         = 16 * SZ_1M },
78         { .name         = "AUTCPU12 flash partition 2",
79           .offset       = 16 * SZ_1M,
80           .size         = 48 * SZ_1M },
81 };
82
83 static struct mtd_partition partition_info128k[] = {
84         { .name         = "AUTCPU12 flash partition 1",
85           .offset       = 0,
86           .size         = 16 * SZ_1M },
87         { .name         = "AUTCPU12 flash partition 2",
88           .offset       = 16 * SZ_1M,
89           .size         = 112 * SZ_1M },
90 };
91
92 #define NUM_PARTITIONS16K 2
93 #define NUM_PARTITIONS32K 2
94 #define NUM_PARTITIONS64K 2
95 #define NUM_PARTITIONS128K 2
96 /*
97  *      hardware specific access to control-lines
98 */
99 static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd)
100 {
101
102         switch(cmd){
103
104                 case NAND_CTL_SETCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_CLE; break;
105                 case NAND_CTL_CLRCLE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_CLE; break;
106
107                 case NAND_CTL_SETALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) |=  AUTCPU12_SMC_ALE; break;
108                 case NAND_CTL_CLRALE: (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) &= ~AUTCPU12_SMC_ALE; break;
109
110                 case NAND_CTL_SETNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x01; break;
111                 case NAND_CTL_CLRNCE: (*(volatile unsigned char *) (autcpu12_fio_base + autcpu12_fio_ctrl)) = 0x00; break;
112         }
113 }
114
115 /*
116 *       read device ready pin
117 */
118 int autcpu12_device_ready(struct mtd_info *mtd)
119 {
120
121         return ( (*(volatile unsigned char *) (autcpu12_io_base + autcpu12_pedr)) & AUTCPU12_SMC_RDY) ? 1 : 0;
122
123 }
124
125 /*
126  * Main initialization routine
127  */
128 int __init autcpu12_init (void)
129 {
130         struct nand_chip *this;
131         int err = 0;
132
133         /* Allocate memory for MTD device structure and private data */
134         autcpu12_mtd = kmalloc (sizeof(struct mtd_info) + sizeof (struct nand_chip),
135                                 GFP_KERNEL);
136         if (!autcpu12_mtd) {
137                 printk ("Unable to allocate AUTCPU12 NAND MTD device structure.\n");
138                 err = -ENOMEM;
139                 goto out;
140         }
141
142         /* map physical adress */
143         autcpu12_fio_base = ioremap(autcpu12_fio_pbase,SZ_1K);
144         if(!autcpu12_fio_base){
145                 printk("Ioremap autcpu12 SmartMedia Card failed\n");
146                 err = -EIO;
147                 goto out_mtd;
148         }
149
150         /* Get pointer to private data */
151         this = (struct nand_chip *) (&autcpu12_mtd[1]);
152
153         /* Initialize structures */
154         memset((char *) autcpu12_mtd, 0, sizeof(struct mtd_info));
155         memset((char *) this, 0, sizeof(struct nand_chip));
156
157         /* Link the private data with the MTD structure */
158         autcpu12_mtd->priv = this;
159
160         /* Set address of NAND IO lines */
161         this->IO_ADDR_R = autcpu12_fio_base;
162         this->IO_ADDR_W = autcpu12_fio_base;
163         this->hwcontrol = autcpu12_hwcontrol;
164         this->dev_ready = autcpu12_device_ready;
165         /* 20 us command delay time */
166         this->chip_delay = 20;
167         this->eccmode = NAND_ECC_SOFT;
168
169         /* Enable the following for a flash based bad block table */
170         /*
171         this->options = NAND_USE_FLASH_BBT;
172         */
173         this->options = NAND_USE_FLASH_BBT;
174
175         /* Scan to find existance of the device */
176         if (nand_scan (autcpu12_mtd, 1)) {
177                 err = -ENXIO;
178                 goto out_ior;
179         }
180
181         /* Register the partitions */
182         switch(autcpu12_mtd->size){
183                 case SZ_16M: add_mtd_partitions(autcpu12_mtd, partition_info16k, NUM_PARTITIONS16K); break;
184                 case SZ_32M: add_mtd_partitions(autcpu12_mtd, partition_info32k, NUM_PARTITIONS32K); break;
185                 case SZ_64M: add_mtd_partitions(autcpu12_mtd, partition_info64k, NUM_PARTITIONS64K); break;
186                 case SZ_128M: add_mtd_partitions(autcpu12_mtd, partition_info128k, NUM_PARTITIONS128K); break;
187                 default: {
188                         printk ("Unsupported SmartMedia device\n");
189                         err = -ENXIO;
190                         goto out_ior;
191                 }
192         }
193         goto out;
194
195 out_ior:
196         iounmap((void *)autcpu12_fio_base);
197 out_mtd:
198         kfree (autcpu12_mtd);
199 out:
200         return err;
201 }
202
203 module_init(autcpu12_init);
204
205 /*
206  * Clean up routine
207  */
208 #ifdef MODULE
209 static void __exit autcpu12_cleanup (void)
210 {
211         /* Release resources, unregister device */
212         nand_release (autcpu12_mtd);
213
214         /* unmap physical adress */
215         iounmap((void *)autcpu12_fio_base);
216
217         /* Free the MTD device structure */
218         kfree (autcpu12_mtd);
219 }
220 module_exit(autcpu12_cleanup);
221 #endif
222
223 MODULE_LICENSE("GPL");
224 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
225 MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");