Merge branch 'kill-jffs-prep' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6] / drivers / mtd / maps / ceiva.c
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");