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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [mtd/] [maps/] [ceiva.c] - Blame information for rev 1765

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Line No. Rev Author Line
1 1275 phoenix
/*
2
 * Ceiva flash memory driver.
3
 * Copyright (C) 2002 Rob Scott <rscott@mtrob.fdns.net>
4
 *
5
 * Note: this driver supports jedec compatible devices. Modification
6
 * for CFI compatible devices should be straight forward: change
7
 * jedec_probe to cfi_probe.
8
 *
9
 * Based on: sa1100-flash.c, which has the following copyright:
10
 * Flash memory access on SA11x0 based devices
11
 *
12
 * (C) 2000 Nicolas Pitre <nico@cam.org>
13
 *
14
 * $Id: ceiva.c,v 1.1.1.1 2004-04-15 01:51:55 phoenix Exp $
15
 */
16
 
17
#include <linux/config.h>
18
#include <linux/module.h>
19
#include <linux/types.h>
20
#include <linux/ioport.h>
21
#include <linux/kernel.h>
22
 
23
#include <linux/mtd/mtd.h>
24
#include <linux/mtd/map.h>
25
#include <linux/mtd/partitions.h>
26
#include <linux/mtd/concat.h>
27
 
28
#include <asm/hardware.h>
29
#include <asm/mach-types.h>
30
#include <asm/io.h>
31
#include <asm/sizes.h>
32
 
33
/*
34
 * This isnt complete yet, so...
35
 */
36
#define CONFIG_MTD_CEIVA_STATICMAP
37
 
38
static __u8 clps_read8(struct map_info *map, unsigned long ofs)
39
{
40
        return readb(map->map_priv_1 + ofs);
41
}
42
 
43
static __u16 clps_read16(struct map_info *map, unsigned long ofs)
44
{
45
        return readw(map->map_priv_1 + ofs);
46
}
47
 
48
static __u32 clps_read32(struct map_info *map, unsigned long ofs)
49
{
50
        return readl(map->map_priv_1 + ofs);
51
}
52
 
53
static void clps_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
54
{
55
        memcpy(to, (void *)(map->map_priv_1 + from), len);
56
}
57
 
58
static void clps_write8(struct map_info *map, __u8 d, unsigned long adr)
59
{
60
        writeb(d, map->map_priv_1 + adr);
61
}
62
 
63
static void clps_write16(struct map_info *map, __u16 d, unsigned long adr)
64
{
65
        writew(d, map->map_priv_1 + adr);
66
}
67
 
68
static void clps_write32(struct map_info *map, __u32 d, unsigned long adr)
69
{
70
        writel(d, map->map_priv_1 + adr);
71
}
72
 
73
static void clps_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
74
{
75
        memcpy((void *)(map->map_priv_1 + to), from, len);
76
}
77
 
78
static struct map_info clps_map __initdata = {
79
        name:           "clps flash",
80
        read8:          clps_read8,
81
        read16:         clps_read16,
82
        read32:         clps_read32,
83
        copy_from:      clps_copy_from,
84
        write8:         clps_write8,
85
        write16:        clps_write16,
86
        write32:        clps_write32,
87
        copy_to:        clps_copy_to,
88
};
89
 
90
#ifdef CONFIG_MTD_CEIVA_STATICMAP
91
/*
92
 * See include/linux/mtd/partitions.h for definition of the mtd_partition
93
 * structure.
94
 *
95
 * Please note:
96
 *  1. The flash size given should be the largest flash size that can
97
 *     be accomodated.
98
 *
99
 *  2. The bus width must defined in clps_setup_flash.
100
 *
101
 * The MTD layer will detect flash chip aliasing and reduce the size of
102
 * the map accordingly.
103
 *
104
 */
105
 
106
#ifdef CONFIG_ARCH_CEIVA
107
/* Flash / Partition sizing */
108
/* For the 28F8003, we use the block mapping to calcuate the sizes */
109
#define MAX_SIZE_KiB                  (16 + 8 + 8 + 96 + (7*128))
110
#define BOOT_PARTITION_SIZE_KiB       (16)
111
#define PARAMS_PARTITION_SIZE_KiB     (8)
112
#define KERNEL_PARTITION_SIZE_KiB     (4*128)
113
/* Use both remaing portion of first flash, and all of second flash */
114
#define ROOT_PARTITION_SIZE_KiB       (3*128) + (8*128)
115
 
116
static struct mtd_partition ceiva_partitions[] = {
117
        {
118
                name: "Ceiva BOOT partition",
119
                size:   BOOT_PARTITION_SIZE_KiB*1024,
120
                offset: 0,
121
 
122
        },{
123
                name: "Ceiva parameters partition",
124
                size:   PARAMS_PARTITION_SIZE_KiB*1024,
125
                offset: (16 + 8) * 1024,
126
        },{
127
                name: "Ceiva kernel partition",
128
                size: (KERNEL_PARTITION_SIZE_KiB)*1024,
129
                offset: 0x20000,
130
 
131
        },{
132
                name: "Ceiva root filesystem partition",
133
                offset: MTDPART_OFS_APPEND,
134
                size: (ROOT_PARTITION_SIZE_KiB)*1024,
135
        }
136
};
137
#endif
138
 
139
static int __init clps_static_partitions(struct mtd_partition **parts)
140
{
141
        int nb_parts = 0;
142
 
143
#ifdef CONFIG_ARCH_CEIVA
144
        if (machine_is_ceiva()) {
145
                *parts       = ceiva_partitions;
146
                nb_parts     = ARRAY_SIZE(ceiva_partitions);
147
        }
148
#endif
149
        return nb_parts;
150
}
151
#endif
152
 
153
struct clps_info {
154
        unsigned long base;
155
        unsigned long size;
156
        int width;
157
        void *vbase;
158
        struct map_info *map;
159
        struct mtd_info *mtd;
160
        struct resource *res;
161
};
162
 
163
#define NR_SUBMTD 4
164
 
165
static struct clps_info info[NR_SUBMTD];
166
 
167
static int __init clps_setup_mtd(struct clps_info *clps, int nr, struct mtd_info **rmtd)
168
{
169
        struct mtd_info *subdev[nr];
170
        struct map_info *maps;
171
        int i, found = 0, ret = 0;
172
 
173
        /*
174
         * Allocate the map_info structs in one go.
175
         */
176
        maps = kmalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
177
        if (!maps)
178
                return -ENOMEM;
179
 
180
        /*
181
         * Claim and then map the memory regions.
182
         */
183
        for (i = 0; i < nr; i++) {
184
                if (clps[i].base == (unsigned long)-1)
185
                        break;
186
 
187
                clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
188
                if (!clps[i].res) {
189
                        ret = -EBUSY;
190
                        break;
191
                }
192
 
193
                clps[i].map = maps + i;
194
                memcpy(clps[i].map, &clps_map, sizeof(struct map_info));
195
 
196
                clps[i].vbase = ioremap(clps[i].base, clps[i].size);
197
                if (!clps[i].vbase) {
198
                        ret = -ENOMEM;
199
                        break;
200
                }
201
 
202
                clps[i].map->map_priv_1 = (unsigned long)clps[i].vbase;
203
                clps[i].map->buswidth = clps[i].width;
204
                clps[i].map->size = clps[i].size;
205
 
206
                clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
207
                if (clps[i].mtd == NULL) {
208
                        ret = -ENXIO;
209
                        break;
210
                }
211
                clps[i].mtd->module = THIS_MODULE;
212
                subdev[i] = clps[i].mtd;
213
 
214
                printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
215
                        "%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
216
                        clps[i].width * 8);
217
                found += 1;
218
        }
219
 
220
        /*
221
         * ENXIO is special.  It means we didn't find a chip when
222
         * we probed.  We need to tear down the mapping, free the
223
         * resource and mark it as such.
224
         */
225
        if (ret == -ENXIO) {
226
                iounmap(clps[i].vbase);
227
                clps[i].vbase = NULL;
228
                release_resource(clps[i].res);
229
                clps[i].res = NULL;
230
        }
231
 
232
        /*
233
         * If we found one device, don't bother with concat support.
234
         * If we found multiple devices, use concat if we have it
235
         * available, otherwise fail.
236
         */
237
        if (ret == 0 || ret == -ENXIO) {
238
                if (found == 1) {
239
                        *rmtd = subdev[0];
240
                        ret = 0;
241
                } else if (found > 1) {
242
                        /*
243
                         * We detected multiple devices.  Concatenate
244
                         * them together.
245
                         */
246
#ifdef CONFIG_MTD_CONCAT
247
                        *rmtd = mtd_concat_create(subdev, found,
248
                                                  "clps flash");
249
                        if (*rmtd == NULL)
250
                                ret = -ENXIO;
251
#else
252
                        printk(KERN_ERR "clps flash: multiple devices "
253
                               "found but MTD concat support disabled.\n");
254
                        ret = -ENXIO;
255
#endif
256
                }
257
        }
258
 
259
        /*
260
         * If we failed, clean up.
261
         */
262
        if (ret) {
263
                do {
264
                        if (clps[i].mtd)
265
                                map_destroy(clps[i].mtd);
266
                        if (clps[i].vbase)
267
                                iounmap(clps[i].vbase);
268
                        if (clps[i].res)
269
                                release_resource(clps[i].res);
270
                } while (i--);
271
 
272
                kfree(maps);
273
        }
274
 
275
        return ret;
276
}
277
 
278
static void __exit clps_destroy_mtd(struct clps_info *clps, struct mtd_info *mtd)
279
{
280
        int i;
281
 
282
        del_mtd_partitions(mtd);
283
 
284
        if (mtd != clps[0].mtd)
285
                mtd_concat_destroy(mtd);
286
 
287
        for (i = NR_SUBMTD; i >= 0; i--) {
288
                if (clps[i].mtd)
289
                        map_destroy(clps[i].mtd);
290
                if (clps[i].vbase)
291
                        iounmap(clps[i].vbase);
292
                if (clps[i].res)
293
                        release_resource(clps[i].res);
294
        }
295
        kfree(clps[0].map);
296
}
297
 
298
/*
299
 * We define the memory space, size, and width for the flash memory
300
 * space here.
301
 */
302
 
303
static int __init clps_setup_flash(void)
304
{
305
        int nr;
306
 
307
#ifdef CONFIG_ARCH_CEIVA
308
        if (machine_is_ceiva()) {
309
                info[0].base = CS0_PHYS_BASE;
310
                info[0].size = SZ_32M;
311
                info[0].width = CEIVA_FLASH_WIDTH;
312
                info[1].base = CS1_PHYS_BASE;
313
                info[1].size = SZ_32M;
314
                info[1].width = CEIVA_FLASH_WIDTH;
315
                nr = 2;
316
        }
317
#endif
318
        return nr;
319
}
320
 
321
extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts);
322
extern int parse_cmdline_partitions(struct mtd_info *master, struct mtd_partition **pparts, char *);
323
 
324
static struct mtd_partition *parsed_parts;
325
 
326
static void __init clps_locate_partitions(struct mtd_info *mtd)
327
{
328
        const char *part_type = NULL;
329
        int nr_parts = 0;
330
        do {
331
                /*
332
                 * Partition selection stuff.
333
                 */
334
#ifdef CONFIG_MTD_CMDLINE_PARTS
335
                nr_parts = parse_cmdline_partitions(mtd, &parsed_parts, "clps");
336
                if (nr_parts > 0) {
337
                        part_type = "command line";
338
                        break;
339
                }
340
#endif
341
#ifdef CONFIG_MTD_REDBOOT_PARTS
342
                nr_parts = parse_redboot_partitions(mtd, &parsed_parts);
343
                if (nr_parts > 0) {
344
                        part_type = "RedBoot";
345
                        break;
346
                }
347
#endif
348
#ifdef CONFIG_MTD_CEIVA_STATICMAP
349
                nr_parts = clps_static_partitions(&parsed_parts);
350
                if (nr_parts > 0) {
351
                        part_type = "static";
352
                        break;
353
                }
354
                printk("found: %d partitions\n", nr_parts);
355
#endif
356
        } while (0);
357
 
358
        if (nr_parts == 0) {
359
                printk(KERN_NOTICE "clps flash: no partition info "
360
                        "available, registering whole flash\n");
361
                add_mtd_device(mtd);
362
        } else {
363
                printk(KERN_NOTICE "clps flash: using %s partition "
364
                        "definition\n", part_type);
365
                add_mtd_partitions(mtd, parsed_parts, nr_parts);
366
        }
367
 
368
        /* Always succeeds. */
369
}
370
 
371
static void __exit clps_destroy_partitions(void)
372
{
373
        if (parsed_parts)
374
                kfree(parsed_parts);
375
}
376
 
377
static struct mtd_info *mymtd;
378
 
379
static int __init clps_mtd_init(void)
380
{
381
        int ret;
382
        int nr;
383
 
384
        nr = clps_setup_flash();
385
        if (nr < 0)
386
                return nr;
387
 
388
        ret = clps_setup_mtd(info, nr, &mymtd);
389
        if (ret)
390
                return ret;
391
 
392
        clps_locate_partitions(mymtd);
393
 
394
        return 0;
395
}
396
 
397
static void __exit clps_mtd_cleanup(void)
398
{
399
        clps_destroy_mtd(info, mymtd);
400
        clps_destroy_partitions();
401
}
402
 
403
module_init(clps_mtd_init);
404
module_exit(clps_mtd_cleanup);
405
 
406
MODULE_AUTHOR("Rob Scott");
407
MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
408
MODULE_LICENSE("GPL");

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