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Rafal Jaworowski500856e2008-01-09 19:39:36 +01001/*
Stefan Roesef2302d42008-08-06 14:05:38 +02002 * (C) Copyright 2007-2008 Semihalf
Rafal Jaworowski500856e2008-01-09 19:39:36 +01003 *
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>
27
28#if defined(CONFIG_API)
29
30#include <common.h>
31#include <api_public.h>
32
Matthias Fuchs3d0ea312008-09-24 10:29:37 +020033#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
34#include <usb.h>
35#endif
36
Rafal Jaworowski500856e2008-01-09 19:39:36 +010037#define DEBUG
38#undef DEBUG
39
40#ifdef DEBUG
41#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
42#else
43#define debugf(fmt, args...)
44#endif
45
46#define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
47
48
49#define ENUM_IDE 0
50#define ENUM_USB 1
51#define ENUM_SCSI 2
52#define ENUM_MMC 3
Stefan Roesef2302d42008-08-06 14:05:38 +020053#define ENUM_SATA 4
54#define ENUM_MAX 5
Rafal Jaworowski500856e2008-01-09 19:39:36 +010055
56struct stor_spec {
57 int max_dev;
58 int enum_started;
59 int enum_ended;
60 int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
Stefan Roesef2302d42008-08-06 14:05:38 +020061 char *name;
Rafal Jaworowski500856e2008-01-09 19:39:36 +010062};
63
64static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };
65
66
67void dev_stor_init(void)
68{
Jean-Christophe PLAGNIOL-VILLARD1b769882008-01-25 07:54:47 +010069#if defined(CONFIG_CMD_IDE)
Rafal Jaworowski500856e2008-01-09 19:39:36 +010070 specs[ENUM_IDE].max_dev = CFG_IDE_MAXDEVICE;
71 specs[ENUM_IDE].enum_started = 0;
72 specs[ENUM_IDE].enum_ended = 0;
73 specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
74 specs[ENUM_IDE].name = "ide";
75#endif
Stefan Roesef2302d42008-08-06 14:05:38 +020076#if defined(CONFIG_CMD_MMC)
77 specs[ENUM_MMC].max_dev = CFG_MMC_MAX_DEVICE;
78 specs[ENUM_MMC].enum_started = 0;
79 specs[ENUM_MMC].enum_ended = 0;
80 specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC;
81 specs[ENUM_MMC].name = "mmc";
82#endif
83#if defined(CONFIG_CMD_SATA)
84 specs[ENUM_SATA].max_dev = CFG_SATA_MAX_DEVICE;
85 specs[ENUM_SATA].enum_started = 0;
86 specs[ENUM_SATA].enum_ended = 0;
87 specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
88 specs[ENUM_SATA].name = "sata";
Rafal Jaworowski500856e2008-01-09 19:39:36 +010089#endif
Jean-Christophe PLAGNIOL-VILLARD1b769882008-01-25 07:54:47 +010090#if defined(CONFIG_CMD_SCSI)
Rafal Jaworowski500856e2008-01-09 19:39:36 +010091 specs[ENUM_SCSI].max_dev = CFG_SCSI_MAX_DEVICE;
92 specs[ENUM_SCSI].enum_started = 0;
93 specs[ENUM_SCSI].enum_ended = 0;
94 specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
95 specs[ENUM_SCSI].name = "scsi";
96#endif
Stefan Roesef2302d42008-08-06 14:05:38 +020097#if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
98 specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
99 specs[ENUM_USB].enum_started = 0;
100 specs[ENUM_USB].enum_ended = 0;
101 specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
102 specs[ENUM_USB].name = "usb";
103#endif
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100104}
105
106/*
107 * Finds next available device in the storage group
108 *
109 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
110 *
111 * first: if 1 the first device in the storage group is returned (if
112 * exists), if 0 the next available device is searched
113 *
114 * more: returns 0/1 depending if there are more devices in this group
115 * available (for future iterations)
116 *
117 * returns: 0/1 depending if device found in this iteration
118 */
119static int dev_stor_get(int type, int first, int *more, struct device_info *di)
120{
121 int found = 0;
122 *more = 0;
123
124 int i;
125
126 block_dev_desc_t *dd;
127
128 if (first) {
129 di->cookie = (void *)get_dev(specs[type].name, 0);
Stefan Roesef2302d42008-08-06 14:05:38 +0200130 if (di->cookie == NULL)
131 return 0;
132 else
133 found = 1;
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100134
135 } else {
136 for (i = 0; i < specs[type].max_dev; i++)
137 if (di->cookie == (void *)get_dev(specs[type].name, i)) {
138 /* previous cookie found -- advance to the
139 * next device, if possible */
140
141 if (++i >= specs[type].max_dev) {
142 /* out of range, no more to enum */
143 di->cookie = NULL;
144 break;
145 }
146
147 di->cookie = (void *)get_dev(specs[type].name, i);
Stefan Roesef2302d42008-08-06 14:05:38 +0200148 if (di->cookie == NULL)
149 return 0;
150 else
151 found = 1;
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100152
153 /* provide hint if there are more devices in
154 * this group to enumerate */
155 if ((i + 1) < specs[type].max_dev)
156 *more = 1;
157
158 break;
159 }
160 }
161
162 if (found) {
163 di->type = specs[type].type;
164
165 if (di->cookie != NULL) {
166 dd = (block_dev_desc_t *)di->cookie;
167 if (dd->type == DEV_TYPE_UNKNOWN) {
168 debugf("device instance exists, but is not active..");
169 found = 0;
170 } else {
171 di->di_stor.block_count = dd->lba;
172 di->di_stor.block_size = dd->blksz;
173 }
174 }
175
176 } else
177 di->cookie = NULL;
178
179 return found;
180}
181
182
183/*
184 * returns: ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t
185 */
186static int dev_stor_type(block_dev_desc_t *dd)
187{
188 int i, j;
189
190 for (i = ENUM_IDE; i < ENUM_MAX; i++)
191 for (j = 0; j < specs[i].max_dev; j++)
192 if (dd == get_dev(specs[i].name, j))
193 return i;
194
195 return ENUM_MAX;
196}
197
198
199/*
200 * returns: 0/1 whether cookie points to some device in this group
201 */
202static int dev_is_stor(int type, struct device_info *di)
203{
204 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
205}
206
207
208static int dev_enum_stor(int type, struct device_info *di)
209{
210 int found = 0, more = 0;
211
212 debugf("called, type %d\n", type);
213
214 /*
215 * Formulae for enumerating storage devices:
216 * 1. if cookie (hint from previous enum call) is NULL we start again
217 * with enumeration, so return the first available device, done.
218 *
219 * 2. if cookie is not NULL, check if it identifies some device in
220 * this group:
221 *
222 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
223 * return next available (if exists) in this group
224 *
225 * 2b. if it isn't device from our group, check if such devices were
226 * ever enumerated before:
227 * - if not, return the first available device from this group
228 * - else return 0
229 */
230
231 if (di->cookie == NULL) {
232
233 debugf("group%d - enum restart\n", type);
234
235 /*
236 * 1. Enumeration (re-)started: take the first available
237 * device, if exists
238 */
239 found = dev_stor_get(type, 1, &more, di);
240 specs[type].enum_started = 1;
241
242 } else if (dev_is_stor(type, di)) {
243
244 debugf("group%d - enum continued for the next device\n", type);
245
246 if (specs[type].enum_ended) {
247 debugf("group%d - nothing more to enum!\n", type);
248 return 0;
249 }
250
251 /* 2a. Attempt to take a next available device in the group */
252 found = dev_stor_get(type, 0, &more, di);
253
254 } else {
255
256 if (specs[type].enum_ended) {
257 debugf("group %d - already enumerated, skipping\n", type);
258 return 0;
259 }
260
261 debugf("group%d - first time enum\n", type);
262
263 if (specs[type].enum_started == 0) {
264 /*
265 * 2b. If enumerating devices in this group did not
266 * happen before, it means the cookie pointed to a
267 * device frome some other group (another storage
268 * group, or network); in this case try to take the
269 * first available device from our group
270 */
271 specs[type].enum_started = 1;
272
273 /*
274 * Attempt to take the first device in this group:
275 *'first element' flag is set
276 */
277 found = dev_stor_get(type, 1, &more, di);
278
279 } else {
280 errf("group%d - out of order iteration\n", type);
281 found = 0;
282 more = 0;
283 }
284 }
285
286 /*
287 * If there are no more devices in this group, consider its
288 * enumeration finished
289 */
290 specs[type].enum_ended = (!more) ? 1 : 0;
291
292 if (found)
293 debugf("device found, returning cookie 0x%08x\n",
294 (u_int32_t)di->cookie);
295 else
296 debugf("no device found\n");
297
298 return found;
299}
300
301void dev_enum_reset(void)
302{
303 int i;
304
305 for (i = 0; i < ENUM_MAX; i ++) {
306 specs[i].enum_started = 0;
307 specs[i].enum_ended = 0;
308 }
309}
310
311int dev_enum_storage(struct device_info *di)
312{
313 int i;
314
315 /*
316 * check: ide, usb, scsi, mmc
317 */
318 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
319 if (dev_enum_stor(i, di))
320 return 1;
321 }
322
323 return 0;
324}
325
326static int dev_stor_is_valid(int type, block_dev_desc_t *dd)
327{
328 int i;
329
330 for (i = 0; i < specs[type].max_dev; i++)
331 if (dd == get_dev(specs[type].name, i))
332 if (dd->type != DEV_TYPE_UNKNOWN)
333 return 1;
334
335 return 0;
336}
337
338
339int dev_open_stor(void *cookie)
340{
341 int type = dev_stor_type(cookie);
342
343 if (type == ENUM_MAX)
344 return API_ENODEV;
345
346 if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie))
347 return 0;
348
349 return API_ENODEV;
350}
351
352
353int dev_close_stor(void *cookie)
354{
355 /*
356 * Not much to do as we actually do not alter storage devices upon
357 * close
358 */
359 return 0;
360}
361
362
363static int dev_stor_index(block_dev_desc_t *dd)
364{
365 int i, type;
366
367 type = dev_stor_type(dd);
368 for (i = 0; i < specs[type].max_dev; i++)
369 if (dd == get_dev(specs[type].name, i))
370 return i;
371
372 return (specs[type].max_dev);
373}
374
375
376lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
377{
378 int type;
379 block_dev_desc_t *dd = (block_dev_desc_t *)cookie;
380
381 if ((type = dev_stor_type(dd)) == ENUM_MAX)
382 return 0;
383
384 if (!dev_stor_is_valid(type, dd))
385 return 0;
386
387 if ((dd->block_read) == NULL) {
Stefan Roesef2302d42008-08-06 14:05:38 +0200388 debugf("no block_read() for device 0x%08x\n", cookie);
Rafal Jaworowski500856e2008-01-09 19:39:36 +0100389 return 0;
390 }
391
392 return (dd->block_read(dev_stor_index(dd), start, len, buf));
393}
394
395#endif /* CONFIG_API */