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 */
autcpu12_hwcontrol(struct mtd_info * mtd,int cmd,unsigned int ctrl)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 */
autcpu12_device_ready(struct mtd_info * mtd)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 */
autcpu12_init(void)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 existence 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 */
autcpu12_cleanup(void)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");
240