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500856eb | 1 | /* |
f2302d44 | 2 | * (C) Copyright 2007-2008 Semihalf |
500856eb RJ |
3 | * |
4 | * Written by: Rafal Jaworowski <raj@semihalf.com> | |
5 | * | |
6 | * See file CREDITS for list of people who contributed to this | |
7 | * project. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation; either version 2 of | |
12 | * the License, or (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
22 | * MA 02111-1307 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <config.h> | |
500856eb RJ |
27 | #include <common.h> |
28 | #include <api_public.h> | |
29 | ||
3d0ea311 MF |
30 | #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE) |
31 | #include <usb.h> | |
32 | #endif | |
33 | ||
500856eb RJ |
34 | #define DEBUG |
35 | #undef DEBUG | |
36 | ||
37 | #ifdef DEBUG | |
38 | #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0) | |
39 | #else | |
40 | #define debugf(fmt, args...) | |
41 | #endif | |
42 | ||
43 | #define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0) | |
44 | ||
45 | ||
46 | #define ENUM_IDE 0 | |
47 | #define ENUM_USB 1 | |
48 | #define ENUM_SCSI 2 | |
49 | #define ENUM_MMC 3 | |
f2302d44 SR |
50 | #define ENUM_SATA 4 |
51 | #define ENUM_MAX 5 | |
500856eb RJ |
52 | |
53 | struct stor_spec { | |
54 | int max_dev; | |
55 | int enum_started; | |
56 | int enum_ended; | |
57 | int type; /* "external" type: DT_STOR_{IDE,USB,etc} */ | |
f2302d44 | 58 | char *name; |
500856eb RJ |
59 | }; |
60 | ||
61 | static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, }; | |
62 | ||
63 | ||
64 | void dev_stor_init(void) | |
65 | { | |
1b769881 | 66 | #if defined(CONFIG_CMD_IDE) |
6d0f6bcf | 67 | specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE; |
500856eb RJ |
68 | specs[ENUM_IDE].enum_started = 0; |
69 | specs[ENUM_IDE].enum_ended = 0; | |
70 | specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE; | |
71 | specs[ENUM_IDE].name = "ide"; | |
72 | #endif | |
f2302d44 | 73 | #if defined(CONFIG_CMD_MMC) |
6d0f6bcf | 74 | specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE; |
f2302d44 SR |
75 | specs[ENUM_MMC].enum_started = 0; |
76 | specs[ENUM_MMC].enum_ended = 0; | |
77 | specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC; | |
78 | specs[ENUM_MMC].name = "mmc"; | |
79 | #endif | |
80 | #if defined(CONFIG_CMD_SATA) | |
6d0f6bcf | 81 | specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE; |
f2302d44 SR |
82 | specs[ENUM_SATA].enum_started = 0; |
83 | specs[ENUM_SATA].enum_ended = 0; | |
84 | specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA; | |
85 | specs[ENUM_SATA].name = "sata"; | |
500856eb | 86 | #endif |
1b769881 | 87 | #if defined(CONFIG_CMD_SCSI) |
6d0f6bcf | 88 | specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE; |
500856eb RJ |
89 | specs[ENUM_SCSI].enum_started = 0; |
90 | specs[ENUM_SCSI].enum_ended = 0; | |
91 | specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI; | |
92 | specs[ENUM_SCSI].name = "scsi"; | |
93 | #endif | |
f2302d44 SR |
94 | #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE) |
95 | specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV; | |
96 | specs[ENUM_USB].enum_started = 0; | |
97 | specs[ENUM_USB].enum_ended = 0; | |
98 | specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB; | |
99 | specs[ENUM_USB].name = "usb"; | |
100 | #endif | |
500856eb RJ |
101 | } |
102 | ||
103 | /* | |
104 | * Finds next available device in the storage group | |
105 | * | |
106 | * type: storage group type - ENUM_IDE, ENUM_SCSI etc. | |
107 | * | |
108 | * first: if 1 the first device in the storage group is returned (if | |
109 | * exists), if 0 the next available device is searched | |
110 | * | |
111 | * more: returns 0/1 depending if there are more devices in this group | |
112 | * available (for future iterations) | |
113 | * | |
114 | * returns: 0/1 depending if device found in this iteration | |
115 | */ | |
116 | static int dev_stor_get(int type, int first, int *more, struct device_info *di) | |
117 | { | |
118 | int found = 0; | |
119 | *more = 0; | |
120 | ||
121 | int i; | |
122 | ||
123 | block_dev_desc_t *dd; | |
124 | ||
125 | if (first) { | |
126 | di->cookie = (void *)get_dev(specs[type].name, 0); | |
f2302d44 SR |
127 | if (di->cookie == NULL) |
128 | return 0; | |
129 | else | |
130 | found = 1; | |
500856eb RJ |
131 | |
132 | } else { | |
133 | for (i = 0; i < specs[type].max_dev; i++) | |
134 | if (di->cookie == (void *)get_dev(specs[type].name, i)) { | |
135 | /* previous cookie found -- advance to the | |
136 | * next device, if possible */ | |
137 | ||
138 | if (++i >= specs[type].max_dev) { | |
139 | /* out of range, no more to enum */ | |
140 | di->cookie = NULL; | |
141 | break; | |
142 | } | |
143 | ||
144 | di->cookie = (void *)get_dev(specs[type].name, i); | |
f2302d44 SR |
145 | if (di->cookie == NULL) |
146 | return 0; | |
147 | else | |
148 | found = 1; | |
500856eb RJ |
149 | |
150 | /* provide hint if there are more devices in | |
151 | * this group to enumerate */ | |
152 | if ((i + 1) < specs[type].max_dev) | |
153 | *more = 1; | |
154 | ||
155 | break; | |
156 | } | |
157 | } | |
158 | ||
159 | if (found) { | |
160 | di->type = specs[type].type; | |
161 | ||
162 | if (di->cookie != NULL) { | |
163 | dd = (block_dev_desc_t *)di->cookie; | |
164 | if (dd->type == DEV_TYPE_UNKNOWN) { | |
165 | debugf("device instance exists, but is not active.."); | |
166 | found = 0; | |
167 | } else { | |
168 | di->di_stor.block_count = dd->lba; | |
169 | di->di_stor.block_size = dd->blksz; | |
170 | } | |
171 | } | |
172 | ||
173 | } else | |
174 | di->cookie = NULL; | |
175 | ||
176 | return found; | |
177 | } | |
178 | ||
179 | ||
180 | /* | |
181 | * returns: ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t | |
182 | */ | |
183 | static int dev_stor_type(block_dev_desc_t *dd) | |
184 | { | |
185 | int i, j; | |
186 | ||
187 | for (i = ENUM_IDE; i < ENUM_MAX; i++) | |
188 | for (j = 0; j < specs[i].max_dev; j++) | |
189 | if (dd == get_dev(specs[i].name, j)) | |
190 | return i; | |
191 | ||
192 | return ENUM_MAX; | |
193 | } | |
194 | ||
195 | ||
196 | /* | |
197 | * returns: 0/1 whether cookie points to some device in this group | |
198 | */ | |
199 | static int dev_is_stor(int type, struct device_info *di) | |
200 | { | |
201 | return (dev_stor_type(di->cookie) == type) ? 1 : 0; | |
202 | } | |
203 | ||
204 | ||
205 | static int dev_enum_stor(int type, struct device_info *di) | |
206 | { | |
207 | int found = 0, more = 0; | |
208 | ||
209 | debugf("called, type %d\n", type); | |
210 | ||
211 | /* | |
212 | * Formulae for enumerating storage devices: | |
213 | * 1. if cookie (hint from previous enum call) is NULL we start again | |
214 | * with enumeration, so return the first available device, done. | |
215 | * | |
216 | * 2. if cookie is not NULL, check if it identifies some device in | |
217 | * this group: | |
218 | * | |
219 | * 2a. if cookie is a storage device from our group (IDE, USB etc.), | |
220 | * return next available (if exists) in this group | |
221 | * | |
222 | * 2b. if it isn't device from our group, check if such devices were | |
223 | * ever enumerated before: | |
224 | * - if not, return the first available device from this group | |
225 | * - else return 0 | |
226 | */ | |
227 | ||
228 | if (di->cookie == NULL) { | |
229 | ||
230 | debugf("group%d - enum restart\n", type); | |
231 | ||
232 | /* | |
233 | * 1. Enumeration (re-)started: take the first available | |
234 | * device, if exists | |
235 | */ | |
236 | found = dev_stor_get(type, 1, &more, di); | |
237 | specs[type].enum_started = 1; | |
238 | ||
239 | } else if (dev_is_stor(type, di)) { | |
240 | ||
241 | debugf("group%d - enum continued for the next device\n", type); | |
242 | ||
243 | if (specs[type].enum_ended) { | |
244 | debugf("group%d - nothing more to enum!\n", type); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | /* 2a. Attempt to take a next available device in the group */ | |
249 | found = dev_stor_get(type, 0, &more, di); | |
250 | ||
251 | } else { | |
252 | ||
253 | if (specs[type].enum_ended) { | |
254 | debugf("group %d - already enumerated, skipping\n", type); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | debugf("group%d - first time enum\n", type); | |
259 | ||
260 | if (specs[type].enum_started == 0) { | |
261 | /* | |
262 | * 2b. If enumerating devices in this group did not | |
263 | * happen before, it means the cookie pointed to a | |
264 | * device frome some other group (another storage | |
265 | * group, or network); in this case try to take the | |
266 | * first available device from our group | |
267 | */ | |
268 | specs[type].enum_started = 1; | |
269 | ||
270 | /* | |
271 | * Attempt to take the first device in this group: | |
272 | *'first element' flag is set | |
273 | */ | |
274 | found = dev_stor_get(type, 1, &more, di); | |
275 | ||
276 | } else { | |
277 | errf("group%d - out of order iteration\n", type); | |
278 | found = 0; | |
279 | more = 0; | |
280 | } | |
281 | } | |
282 | ||
283 | /* | |
284 | * If there are no more devices in this group, consider its | |
285 | * enumeration finished | |
286 | */ | |
287 | specs[type].enum_ended = (!more) ? 1 : 0; | |
288 | ||
289 | if (found) | |
290 | debugf("device found, returning cookie 0x%08x\n", | |
291 | (u_int32_t)di->cookie); | |
292 | else | |
293 | debugf("no device found\n"); | |
294 | ||
295 | return found; | |
296 | } | |
297 | ||
298 | void dev_enum_reset(void) | |
299 | { | |
300 | int i; | |
301 | ||
302 | for (i = 0; i < ENUM_MAX; i ++) { | |
303 | specs[i].enum_started = 0; | |
304 | specs[i].enum_ended = 0; | |
305 | } | |
306 | } | |
307 | ||
308 | int dev_enum_storage(struct device_info *di) | |
309 | { | |
310 | int i; | |
311 | ||
312 | /* | |
313 | * check: ide, usb, scsi, mmc | |
314 | */ | |
315 | for (i = ENUM_IDE; i < ENUM_MAX; i ++) { | |
316 | if (dev_enum_stor(i, di)) | |
317 | return 1; | |
318 | } | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static int dev_stor_is_valid(int type, block_dev_desc_t *dd) | |
324 | { | |
325 | int i; | |
326 | ||
327 | for (i = 0; i < specs[type].max_dev; i++) | |
328 | if (dd == get_dev(specs[type].name, i)) | |
329 | if (dd->type != DEV_TYPE_UNKNOWN) | |
330 | return 1; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | ||
336 | int dev_open_stor(void *cookie) | |
337 | { | |
338 | int type = dev_stor_type(cookie); | |
339 | ||
340 | if (type == ENUM_MAX) | |
341 | return API_ENODEV; | |
342 | ||
343 | if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie)) | |
344 | return 0; | |
345 | ||
346 | return API_ENODEV; | |
347 | } | |
348 | ||
349 | ||
350 | int dev_close_stor(void *cookie) | |
351 | { | |
352 | /* | |
353 | * Not much to do as we actually do not alter storage devices upon | |
354 | * close | |
355 | */ | |
356 | return 0; | |
357 | } | |
358 | ||
359 | ||
360 | static int dev_stor_index(block_dev_desc_t *dd) | |
361 | { | |
362 | int i, type; | |
363 | ||
364 | type = dev_stor_type(dd); | |
365 | for (i = 0; i < specs[type].max_dev; i++) | |
366 | if (dd == get_dev(specs[type].name, i)) | |
367 | return i; | |
368 | ||
369 | return (specs[type].max_dev); | |
370 | } | |
371 | ||
372 | ||
373 | lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start) | |
374 | { | |
375 | int type; | |
376 | block_dev_desc_t *dd = (block_dev_desc_t *)cookie; | |
377 | ||
378 | if ((type = dev_stor_type(dd)) == ENUM_MAX) | |
379 | return 0; | |
380 | ||
381 | if (!dev_stor_is_valid(type, dd)) | |
382 | return 0; | |
383 | ||
384 | if ((dd->block_read) == NULL) { | |
f2302d44 | 385 | debugf("no block_read() for device 0x%08x\n", cookie); |
500856eb RJ |
386 | return 0; |
387 | } | |
388 | ||
389 | return (dd->block_read(dev_stor_index(dd), start, len, buf)); | |
390 | } |