1 /*
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 1.11 2004/09/16 23:27:12 gleixner Exp $
15 */
16
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/ioport.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/slab.h>
23
24 #include <linux/mtd/mtd.h>
25 #include <linux/mtd/map.h>
26 #include <linux/mtd/partitions.h>
27 #include <linux/mtd/concat.h>
28
29 #include <asm/hardware.h>
30 #include <asm/mach-types.h>
31 #include <asm/io.h>
32 #include <asm/sizes.h>
33
34 /*
35 * This isn't complete yet, so...
36 */
37 #define CONFIG_MTD_CEIVA_STATICMAP
38
39 #ifdef CONFIG_MTD_CEIVA_STATICMAP
40 /*
41 * See include/linux/mtd/partitions.h for definition of the mtd_partition
42 * structure.
43 *
44 * Please note:
45 * 1. The flash size given should be the largest flash size that can
46 * be accomodated.
47 *
48 * 2. The bus width must defined in clps_setup_flash.
49 *
50 * The MTD layer will detect flash chip aliasing and reduce the size of
51 * the map accordingly.
52 *
53 */
54
55 #ifdef CONFIG_ARCH_CEIVA
56 /* Flash / Partition sizing */
57 /* For the 28F8003, we use the block mapping to calcuate the sizes */
58 #define MAX_SIZE_KiB (16 + 8 + 8 + 96 + (7*128))
59 #define BOOT_PARTITION_SIZE_KiB (16)
60 #define PARAMS_PARTITION_SIZE_KiB (8)
61 #define KERNEL_PARTITION_SIZE_KiB (4*128)
62 /* Use both remaing portion of first flash, and all of second flash */
63 #define ROOT_PARTITION_SIZE_KiB (3*128) + (8*128)
64
65 static struct mtd_partition ceiva_partitions[] = {
66 {
67 .name = "Ceiva BOOT partition",
68 .size = BOOT_PARTITION_SIZE_KiB*1024,
69 .offset = 0,
70
71 },{
72 .name = "Ceiva parameters partition",
73 .size = PARAMS_PARTITION_SIZE_KiB*1024,
74 .offset = (16 + 8) * 1024,
75 },{
76 .name = "Ceiva kernel partition",
77 .size = (KERNEL_PARTITION_SIZE_KiB)*1024,
78 .offset = 0x20000,
79
80 },{
81 .name = "Ceiva root filesystem partition",
82 .offset = MTDPART_OFS_APPEND,
83 .size = (ROOT_PARTITION_SIZE_KiB)*1024,
84 }
85 };
86 #endif
87
88 static int __init clps_static_partitions(struct mtd_partition **parts)
89 {
90 int nb_parts = 0;
91
92 #ifdef CONFIG_ARCH_CEIVA
93 if (machine_is_ceiva()) {
94 *parts = ceiva_partitions;
95 nb_parts = ARRAY_SIZE(ceiva_partitions);
96 }
97 #endif
98 return nb_parts;
99 }
100 #endif
101
102 struct clps_info {
103 unsigned long base;
104 unsigned long size;
105 int width;
106 void *vbase;
107 struct map_info *map;
108 struct mtd_info *mtd;
109 struct resource *res;
110 };
111
112 #define NR_SUBMTD 4
113
114 static struct clps_info info[NR_SUBMTD];
115
116 static int __init clps_setup_mtd(struct clps_info *clps, int nr, struct mtd_info **rmtd)
117 {
118 struct mtd_info *subdev[nr];
119 struct map_info *maps;
120 int i, found = 0, ret = 0;
121
122 /*
123 * Allocate the map_info structs in one go.
124 */
125 maps = kzalloc(sizeof(struct map_info) * nr, GFP_KERNEL);
126 if (!maps)
127 return -ENOMEM;
128 /*
129 * Claim and then map the memory regions.
130 */
131 for (i = 0; i < nr; i++) {
132 if (clps[i].base == (unsigned long)-1)
133 break;
134
135 clps[i].res = request_mem_region(clps[i].base, clps[i].size, "clps flash");
136 if (!clps[i].res) {
137 ret = -EBUSY;
138 break;
139 }
140
141 clps[i].map = maps + i;
142
143 clps[i].map->name = "clps flash";
144 clps[i].map->phys = clps[i].base;
145
146 clps[i].vbase = ioremap(clps[i].base, clps[i].size);
147 if (!clps[i].vbase) {
148 ret = -ENOMEM;
149 break;
150 }
151
152 clps[i].map->virt = (void __iomem *)clps[i].vbase;
153 clps[i].map->bankwidth = clps[i].width;
154 clps[i].map->size = clps[i].size;
155
156 simple_map_init(&clps[i].map);
157
158 clps[i].mtd = do_map_probe("jedec_probe", clps[i].map);
159 if (clps[i].mtd == NULL) {
160 ret = -ENXIO;
161 break;
162 }
163 clps[i].mtd->owner = THIS_MODULE;
164 subdev[i] = clps[i].mtd;
165
166 printk(KERN_INFO "clps flash: JEDEC device at 0x%08lx, %dMiB, "
167 "%d-bit\n", clps[i].base, clps[i].mtd->size >> 20,
168 clps[i].width * 8);
169 found += 1;
170 }
171
172 /*
173 * ENXIO is special. It means we didn't find a chip when
174 * we probed. We need to tear down the mapping, free the
175 * resource and mark it as such.
176 */
177 if (ret == -ENXIO) {
178 iounmap(clps[i].vbase);
179 clps[i].vbase = NULL;
180 release_resource(clps[i].res);
181 clps[i].res = NULL;
182 }
183
184 /*
185 * If we found one device, don't bother with concat support.
186 * If we found multiple devices, use concat if we have it
187 * available, otherwise fail.
188 */
189 if (ret == 0 || ret == -ENXIO) {
190 if (found == 1) {
191 *rmtd = subdev[0];
192 ret = 0;
193 } else if (found > 1) {
194 /*
195 * We detected multiple devices. Concatenate
196 * them together.
197 */
198 #ifdef CONFIG_MTD_CONCAT
199 *rmtd = mtd_concat_create(subdev, found,
200 "clps flash");
201 if (*rmtd == NULL)
202 ret = -ENXIO;
203 #else
204 printk(KERN_ERR "clps flash: multiple devices "
205 "found but MTD concat support disabled.\n");
206 ret = -ENXIO;
207 #endif
208 }
209 }
210
211 /*
212 * If we failed, clean up.
213 */
214 if (ret) {
215 do {
216 if (clps[i].mtd)
217 map_destroy(clps[i].mtd);
218 if (clps[i].vbase)
219 iounmap(clps[i].vbase);
220 if (clps[i].res)
221 release_resource(clps[i].res);
222 } while (i--);
223
224 kfree(maps);
225 }
226
227 return ret;
228 }
229
230 static void __exit clps_destroy_mtd(struct clps_info *clps, struct mtd_info *mtd)
231 {
232 int i;
233
234 del_mtd_partitions(mtd);
235
236 if (mtd != clps[0].mtd)
237 mtd_concat_destroy(mtd);
238
239 for (i = NR_SUBMTD; i >= 0; i--) {
240 if (clps[i].mtd)
241 map_destroy(clps[i].mtd);
242 if (clps[i].vbase)
243 iounmap(clps[i].vbase);
244 if (clps[i].res)
245 release_resource(clps[i].res);
246 }
247 kfree(clps[0].map);
248 }
249
250 /*
251 * We define the memory space, size, and width for the flash memory
252 * space here.
253 */
254
255 static int __init clps_setup_flash(void)
256 {
257 int nr;
258
259 #ifdef CONFIG_ARCH_CEIVA
260 if (machine_is_ceiva()) {
261 info[0].base = CS0_PHYS_BASE;
262 info[0].size = SZ_32M;
263 info[0].width = CEIVA_FLASH_WIDTH;
264 info[1].base = CS1_PHYS_BASE;
265 info[1].size = SZ_32M;
266 info[1].width = CEIVA_FLASH_WIDTH;
267 nr = 2;
268 }
269 #endif
270 return nr;
271 }
272
273 static struct mtd_partition *parsed_parts;
274 static const char *probes[] = { "cmdlinepart", "RedBoot", NULL };
275
276 static void __init clps_locate_partitions(struct mtd_info *mtd)
277 {
278 const char *part_type = NULL;
279 int nr_parts = 0;
280 do {
281 /*
282 * Partition selection stuff.
283 */
284 nr_parts = parse_mtd_partitions(mtd, probes, &parsed_parts, 0);
285 if (nr_parts > 0) {
286 part_type = "command line";
287 break;
288 }
289 #ifdef CONFIG_MTD_CEIVA_STATICMAP
290 nr_parts = clps_static_partitions(&parsed_parts);
291 if (nr_parts > 0) {
292 part_type = "static";
293 break;
294 }
295 printk("found: %d partitions\n", nr_parts);
296 #endif
297 } while (0);
298
299 if (nr_parts == 0) {
300 printk(KERN_NOTICE "clps flash: no partition info "
301 "available, registering whole flash\n");
302 add_mtd_device(mtd);
303 } else {
304 printk(KERN_NOTICE "clps flash: using %s partition "
305 "definition\n", part_type);
306 add_mtd_partitions(mtd, parsed_parts, nr_parts);
307 }
308
309 /* Always succeeds. */
310 }
311
312 static void __exit clps_destroy_partitions(void)
313 {
314 kfree(parsed_parts);
315 }
316
317 static struct mtd_info *mymtd;
318
319 static int __init clps_mtd_init(void)
320 {
321 int ret;
322 int nr;
323
324 nr = clps_setup_flash();
325 if (nr < 0)
326 return nr;
327
328 ret = clps_setup_mtd(info, nr, &mymtd);
329 if (ret)
330 return ret;
331
332 clps_locate_partitions(mymtd);
333
334 return 0;
335 }
336
337 static void __exit clps_mtd_cleanup(void)
338 {
339 clps_destroy_mtd(info, mymtd);
340 clps_destroy_partitions();
341 }
342
343 module_init(clps_mtd_init);
344 module_exit(clps_mtd_cleanup);
345
346 MODULE_AUTHOR("Rob Scott");
347 MODULE_DESCRIPTION("Cirrus Logic JEDEC map driver");
348 MODULE_LICENSE("GPL");
349
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