aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/ceiva.c
blob: 6464d487eb1ade983c336ab65edbe7312c0de4bc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
/*
 * Ceiva flash memory driver.
 * Copyright (C) 2002 Rob Scott <rscott@mtrob.fdns.net>
 *
 * Note: this driver supports jedec compatible devices. Modification
 * for CFI compatible devices should be straight forward: change
 * jedec_probe to cfi_probe.
 *
 * Based on: sa1100-flash.c, which has the following copyright:
 * Flash memory access on SA11x0 based devices
 *
 * (C) 2000 Nicolas Pitre <nico@cam.org>
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/concat.h>

#include <asm/hardware.h>
#include <asm/mach-types.h>
#include <asm/io.h>
#include <asm/sizes.h>

/*
 * This isn't complete yet, so...
 */
#define CONFIG_MTD_CEIVA_STATICMAP

#ifdef CONFIG_MTD_CEIVA_STATICMAP
/*
 * See include/linux/mtd/partitions.h for definition of the mtd_partition
 * structure.
 *
 * Please note:
 *  1. The flash size given should be the largest flash size that can
 *     be accomodated.
 *
 *  2. The bus width must defined in clps_setup_flash.
 *
 * The MTD layer will detect flash chip aliasing and reduce the size of
 * the map accordingly.
 *
 */

#ifdef CONFIG_ARCH_CEIVA
/* Flash / Partition sizing */
/* For the 28F8003, we use the block mapping to calcuate the sizes */
#define MAX_SIZE_KiB                  (16 + 8 + 8 + 96 + (7*128))
#define BOOT_PARTITION_SIZE_KiB       (16)
#define PARAMS_PARTITION_SIZE_KiB     (8)
#define KERNEL_PARTITION_SIZE_KiB     (4*128)
/* Use both remaing portion of first flash, and all of second flash */
#define ROOT_PARTITION_SIZE_KiB       (3*128) + (8*128)

static struct mtd_partition ceiva_partitions[] = {
	{
		.name = "Ceiva BOOT partition",
		.size   = BOOT_PARTITION_SIZE_KiB*1024,
		.offset = 0,

	},{
		.name = "Ceiva parameters partition",
		.size   = PARAMS_PARTITION_SIZE_KiB*1024,
		.offset = (16 + 8) * 1024,
	},{
		.name = "Ceiva kernel partition",
		.size = (KERNEL_PARTITION_SIZE_KiB)*1024,
		.offset = 0x20000,

	},{
		.name = "Ceiva root filesystem partition",
		.offset = MTDPART_OFS_APPEND,
		.size = (ROOT_PARTITION_SIZE_KiB)*1024,
	}
};
#endif

static int __init clps_static_partitions(struct mtd_partition **parts)
{
	int nb_parts = 0;

#ifdef CONFIG_ARCH_CEIVA
	if (machine_is_ceiva()) {
		*parts       = ceiva_partitions;
		nb_parts     = ARRAY_SIZE(ceiva_partitions);
	}
#endif
	return nb_parts;
}
#endif

struct clps_info {
	unsigned long base;
	unsigned long size;
	int width;
	void *vbase;
	struct map_info *map;
	struct mtd_info *mtd;
	struct resource *res;
};

#define NR_SUBMTD 4

static struct clps_info info[NR_SUBMTD];

static int __init clps_setup_mtd(struct clps_info *clps, int nr, struct mtd_info **rmtd)
{
	struct mtd_info *subdev[nr];
	struct map_info *maps;
	int i, found = 0, ret = 0;

	/*
	 * Allocate the map_info structs in one go.
	 */
	maps = kzalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
	if (!maps)
		return -ENOMEM;
	/*
	 * Claim and then map the memory regions.
	 */
	for (i = 0; i < nr; i++) {
		if (clps[i].base == (unsigned long)-1)
			break;

		clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
		if (!clps[i].res) {
			ret = -EBUSY;
			break;
		}

		clps[i].map = maps + i;

		clps[i].map->name = "clps flash";
		clps[i].map->phys = clps[i].base;

		clps[i].vbase = ioremap(clps[i].base, clps[i].size);
		if (!clps[i].vbase) {
			ret = -ENOMEM;
			break;
		}

		clps[i].map->virt = (void __iomem *)clps[i].vbase;
		clps[i].map->bankwidth = clps[i].width;
		clps[i].map->size = clps[i].size;

		simple_map_init(&clps[i].map);

		clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
		if (clps[i].mtd == NULL) {
			ret = -ENXIO;
			break;
		}
		clps[i].mtd->owner = THIS_MODULE;
		subdev[i] = clps[i].mtd;

		printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
			"%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
			clps[i].width * 8);
		found += 1;
	}

	/*
	 * ENXIO is special.  It means we didn't find a chip when
	 * we probed.  We need to tear down the mapping, free the
	 * resource and mark it as such.
	 */
	if (ret == -ENXIO) {
		iounmap(clps[i].vbase);
		clps[i].vbase = NULL;
		release_resource(clps[i].res);
		clps[i].res = NULL;
	}

	/*
	 * If we found one device, don't bother with concat support.
	 * If we found multiple devices, use concat if we have it
	 * available, otherwise fail.
	 */
	if (ret == 0 || ret == -ENXIO) {
		if (found == 1) {
			*rmtd = subdev[0];
			ret = 0;
		} else if (found > 1) {
			/*
			 * We detected multiple devices.  Concatenate
			 * them together.
			 */
#ifdef CONFIG_MTD_CONCAT
			*rmtd = mtd_concat_create(subdev, found,
						  "clps flash");
			if (*rmtd == NULL)
				ret = -ENXIO;
#else
			printk(KERN_ERR "clps flash: multiple devices "
			       "found but MTD concat support disabled.\n");
			ret = -ENXIO;
#endif
		}
	}

	/*
	 * If we failed, clean up.
	 */
	if (ret) {
		do {
			if (clps[i].mtd)
				map_destroy(clps[i].mtd);
			if (clps[i].vbase)
				iounmap(clps[i].vbase);
			if (clps[i].res)
				release_resource(clps[i].res);
		} while (i--);

		kfree(maps);
	}

	return ret;
}

static void __exit clps_destroy_mtd(struct clps_info *clps, struct mtd_info *mtd)
{
	int i;

	del_mtd_partitions(mtd);

	if (mtd != clps[0].mtd)
		mtd_concat_destroy(mtd);

	for (i = NR_SUBMTD; i >= 0; i--) {
		if (clps[i].mtd)
			map_destroy(clps[i].mtd);
		if (clps[i].vbase)
			iounmap(clps[i].vbase);
		if (clps[i].res)
			release_resource(clps[i].res);
	}
	kfree(clps[0].map);
}

/*
 * We define the memory space, size, and width for the flash memory
 * space here.
 */

static int __init clps_setup_flash(void)
{
	int nr;

#ifdef CONFIG_ARCH_CEIVA
	if (machine_is_ceiva()) {
		info[0].base = CS0_PHYS_BASE;
		info[0].size = SZ_32M;
		info[0].width = CEIVA_FLASH_WIDTH;
		info[1].base = CS1_PHYS_BASE;
		info[1].size = SZ_32M;
		info[1].width = CEIVA_FLASH_WIDTH;
		nr = 2;
	}
#endif
	return nr;
}

static struct mtd_partition *parsed_parts;
static const char *probes[] = { "cmdlinepart", "RedBoot", NULL };

static void __init clps_locate_partitions(struct mtd_info *mtd)
{
	const char *part_type = NULL;
	int nr_parts = 0;
	do {
		/*
		 * Partition selection stuff.
		 */
		nr_parts = parse_mtd_partitions(mtd, probes, &parsed_parts, 0);
		if (nr_parts > 0) {
			part_type = "command line";
			break;
		}
#ifdef CONFIG_MTD_CEIVA_STATICMAP
		nr_parts = clps_static_partitions(&parsed_parts);
		if (nr_parts > 0) {
			part_type = "static";
			break;
		}
		printk("found: %d partitions\n", nr_parts);
#endif
	} while (0);

	if (nr_parts == 0) {
		printk(KERN_NOTICE "clps flash: no partition info "
			"available, registering whole flash\n");
		add_mtd_device(mtd);
	} else {
		printk(KERN_NOTICE "clps flash: using %s partition "
			"definition\n", part_type);
		add_mtd_partitions(mtd, parsed_parts, nr_parts);
	}

	/* Always succeeds. */
}

static void __exit clps_destroy_partitions(void)
{
	kfree(parsed_parts);
}

static struct mtd_info *mymtd;

static int __init clps_mtd_init(void)
{
	int ret;
	int nr;

	nr = clps_setup_flash();
	if (nr < 0)
		return nr;

	ret = clps_setup_mtd(info, nr, &mymtd);
	if (ret)
		return ret;

	clps_locate_partitions(mymtd);

	return 0;
}

static void __exit clps_mtd_cleanup(void)
{
	clps_destroy_mtd(info, mymtd);
	clps_destroy_partitions();
}

module_init(clps_mtd_init);
module_exit(clps_mtd_cleanup);

MODULE_AUTHOR("Rob Scott");
MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
MODULE_LICENSE("GPL");