1 /*
2 * $Id: ixp4xx.c,v 1.7 2004/11/04 13:24:15 gleixner Exp $
3 *
4 * drivers/mtd/maps/ixp4xx.c
5 *
6 * MTD Map file for IXP4XX based systems. Please do not make per-board
7 * changes in here. If your board needs special setup, do it in your
8 * platform level code in arch/arm/mach-ixp4xx/board-setup.c
9 *
10 * Original Author: Intel Corporation
11 * Maintainer: Deepak Saxena <dsaxena@mvista.com>
12 *
13 * Copyright (C) 2002 Intel Corporation
14 * Copyright (C) 2003-2004 MontaVista Software, Inc.
15 *
16 */
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/map.h>
25 #include <linux/mtd/partitions.h>
26 #include <linux/ioport.h>
27 #include <linux/device.h>
28 #include <asm/io.h>
29 #include <asm/mach-types.h>
30 #include <asm/mach/flash.h>
31
32 #include <linux/reboot.h>
33
34 #ifndef __ARMEB__
35 #define BYTE0(h) ((h) & 0xFF)
36 #define BYTE1(h) (((h) >> 8) & 0xFF)
37 #else
38 #define BYTE0(h) (((h) >> 8) & 0xFF)
39 #define BYTE1(h) ((h) & 0xFF)
40 #endif
41
42 static map_word ixp4xx_read16(struct map_info *map, unsigned long ofs)
43 {
44 map_word val;
45 val.x[0] = *(__u16 *) (map->map_priv_1 + ofs);
46 return val;
47 }
48
49 /*
50 * The IXP4xx expansion bus only allows 16-bit wide acceses
51 * when attached to a 16-bit wide device (such as the 28F128J3A),
52 * so we can't just memcpy_fromio().
53 */
54 static void ixp4xx_copy_from(struct map_info *map, void *to,
55 unsigned long from, ssize_t len)
56 {
57 int i;
58 u8 *dest = (u8 *) to;
59 u16 *src = (u16 *) (map->map_priv_1 + from);
60 u16 data;
61
62 for (i = 0; i < (len / 2); i++) {
63 data = src[i];
64 dest[i * 2] = BYTE0(data);
65 dest[i * 2 + 1] = BYTE1(data);
66 }
67
68 if (len & 1)
69 dest[len - 1] = BYTE0(src[i]);
70 }
71
72 /*
73 * Unaligned writes are ignored, causing the 8-bit
74 * probe to fail and proceed to the 16-bit probe (which succeeds).
75 */
76 static void ixp4xx_probe_write16(struct map_info *map, map_word d, unsigned long adr)
77 {
78 if (!(adr & 1))
79 *(__u16 *) (map->map_priv_1 + adr) = d.x[0];
80 }
81
82 /*
83 * Fast write16 function without the probing check above
84 */
85 static void ixp4xx_write16(struct map_info *map, map_word d, unsigned long adr)
86 {
87 *(__u16 *) (map->map_priv_1 + adr) = d.x[0];
88 }
89
90 struct ixp4xx_flash_info {
91 struct mtd_info *mtd;
92 struct map_info map;
93 struct mtd_partition *partitions;
94 struct resource *res;
95 };
96
97 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
98
99 static int ixp4xx_flash_remove(struct device *_dev)
100 {
101 struct platform_device *dev = to_platform_device(_dev);
102 struct flash_platform_data *plat = dev->dev.platform_data;
103 struct ixp4xx_flash_info *info = dev_get_drvdata(&dev->dev);
104 map_word d;
105
106 dev_set_drvdata(&dev->dev, NULL);
107
108 if(!info)
109 return 0;
110
111 /*
112 * This is required for a soft reboot to work.
113 */
114 d.x[0] = 0xff;
115 ixp4xx_write16(&info->map, d, 0x55 * 0x2);
116
117 if (info->mtd) {
118 del_mtd_partitions(info->mtd);
119 map_destroy(info->mtd);
120 }
121 if (info->map.map_priv_1)
122 iounmap((void *) info->map.map_priv_1);
123
124 if (info->partitions)
125 kfree(info->partitions);
126
127 if (info->res) {
128 release_resource(info->res);
129 kfree(info->res);
130 }
131
132 if (plat->exit)
133 plat->exit();
134
135 /* Disable flash write */
136 *IXP4XX_EXP_CS0 &= ~IXP4XX_FLASH_WRITABLE;
137
138 return 0;
139 }
140
141 static int ixp4xx_flash_probe(struct device *_dev)
142 {
143 struct platform_device *dev = to_platform_device(_dev);
144 struct flash_platform_data *plat = dev->dev.platform_data;
145 struct ixp4xx_flash_info *info;
146 int err = -1;
147
148 if (!plat)
149 return -ENODEV;
150
151 if (plat->init) {
152 err = plat->init();
153 if (err)
154 return err;
155 }
156
157 info = kmalloc(sizeof(struct ixp4xx_flash_info), GFP_KERNEL);
158 if(!info) {
159 err = -ENOMEM;
160 goto Error;
161 }
162 memzero(info, sizeof(struct ixp4xx_flash_info));
163
164 dev_set_drvdata(&dev->dev, info);
165
166 /*
167 * Enable flash write
168 * TODO: Move this out to board specific code
169 */
170 *IXP4XX_EXP_CS0 |= IXP4XX_FLASH_WRITABLE;
171
172 /*
173 * Tell the MTD layer we're not 1:1 mapped so that it does
174 * not attempt to do a direct access on us.
175 */
176 info->map.phys = NO_XIP;
177 info->map.size = dev->resource->end - dev->resource->start + 1;
178
179 /*
180 * We only support 16-bit accesses for now. If and when
181 * any board use 8-bit access, we'll fixup the driver to
182 * handle that.
183 */
184 info->map.bankwidth = 2;
185 info->map.name = dev->dev.bus_id;
186 info->map.read = ixp4xx_read16,
187 info->map.write = ixp4xx_probe_write16,
188 info->map.copy_from = ixp4xx_copy_from,
189
190 info->res = request_mem_region(dev->resource->start,
191 dev->resource->end - dev->resource->start + 1,
192 "IXP4XXFlash");
193 if (!info->res) {
194 printk(KERN_ERR "IXP4XXFlash: Could not reserve memory region\n");
195 err = -ENOMEM;
196 goto Error;
197 }
198
199 info->map.map_priv_1 = ioremap(dev->resource->start,
200 dev->resource->end - dev->resource->start + 1);
201 if (!info->map.map_priv_1) {
202 printk(KERN_ERR "IXP4XXFlash: Failed to ioremap region\n");
203 err = -EIO;
204 goto Error;
205 }
206
207 info->mtd = do_map_probe(plat->map_name, &info->map);
208 if (!info->mtd) {
209 printk(KERN_ERR "IXP4XXFlash: map_probe failed\n");
210 err = -ENXIO;
211 goto Error;
212 }
213 info->mtd->owner = THIS_MODULE;
214
215 /* Use the fast version */
216 info->map.write = ixp4xx_write16,
217
218 err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
219 if (err > 0) {
220 err = add_mtd_partitions(info->mtd, info->partitions, err);
221 if(err)
222 printk(KERN_ERR "Could not parse partitions\n");
223 }
224
225 if (err)
226 goto Error;
227
228 return 0;
229
230 Error:
231 ixp4xx_flash_remove(_dev);
232 return err;
233 }
234
235 static struct device_driver ixp4xx_flash_driver = {
236 .name = "IXP4XX-Flash",
237 .bus = &platform_bus_type,
238 .probe = ixp4xx_flash_probe,
239 .remove = ixp4xx_flash_remove,
240 };
241
242 static int __init ixp4xx_flash_init(void)
243 {
244 return driver_register(&ixp4xx_flash_driver);
245 }
246
247 static void __exit ixp4xx_flash_exit(void)
248 {
249 driver_unregister(&ixp4xx_flash_driver);
250 }
251
252
253 module_init(ixp4xx_flash_init);
254 module_exit(ixp4xx_flash_exit);
255
256 MODULE_LICENSE("GPL");
257 MODULE_DESCRIPTION("MTD map driver for Intel IXP4xx systems")
258 MODULE_AUTHOR("Deepak Saxena");
259
260
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