2 * (C) Copyright 2007-2008 Semihalf
4 * Written by: Rafal Jaworowski <raj@semihalf.com>
6 * See file CREDITS for list of people who contributed to this
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.
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.
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,
28 #if defined(CONFIG_API)
31 #include <api_public.h>
37 #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
39 #define debugf(fmt, args...)
42 #define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
55 int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
59 static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };
62 void dev_stor_init(void)
64 #if defined(CONFIG_CMD_IDE)
65 specs[ENUM_IDE].max_dev = CFG_IDE_MAXDEVICE;
66 specs[ENUM_IDE].enum_started = 0;
67 specs[ENUM_IDE].enum_ended = 0;
68 specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
69 specs[ENUM_IDE].name = "ide";
71 #if defined(CONFIG_CMD_USB)
72 specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
73 specs[ENUM_USB].enum_started = 0;
74 specs[ENUM_USB].enum_ended = 0;
75 specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
76 specs[ENUM_USB].name = "usb";
78 #if defined(CONFIG_CMD_SCSI)
79 specs[ENUM_SCSI].max_dev = CFG_SCSI_MAX_DEVICE;
80 specs[ENUM_SCSI].enum_started = 0;
81 specs[ENUM_SCSI].enum_ended = 0;
82 specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
83 specs[ENUM_SCSI].name = "scsi";
88 * Finds next available device in the storage group
90 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
92 * first: if 1 the first device in the storage group is returned (if
93 * exists), if 0 the next available device is searched
95 * more: returns 0/1 depending if there are more devices in this group
96 * available (for future iterations)
98 * returns: 0/1 depending if device found in this iteration
100 static int dev_stor_get(int type, int first, int *more, struct device_info *di)
107 block_dev_desc_t *dd;
110 di->cookie = (void *)get_dev(specs[type].name, 0);
111 if (di->cookie == NULL)
117 for (i = 0; i < specs[type].max_dev; i++)
118 if (di->cookie == (void *)get_dev(specs[type].name, i)) {
119 /* previous cookie found -- advance to the
120 * next device, if possible */
122 if (++i >= specs[type].max_dev) {
123 /* out of range, no more to enum */
128 di->cookie = (void *)get_dev(specs[type].name, i);
129 if (di->cookie == NULL)
134 /* provide hint if there are more devices in
135 * this group to enumerate */
136 if ((i + 1) < specs[type].max_dev)
144 di->type = specs[type].type;
146 if (di->cookie != NULL) {
147 dd = (block_dev_desc_t *)di->cookie;
148 if (dd->type == DEV_TYPE_UNKNOWN) {
149 debugf("device instance exists, but is not active..");
152 di->di_stor.block_count = dd->lba;
153 di->di_stor.block_size = dd->blksz;
165 * returns: ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t
167 static int dev_stor_type(block_dev_desc_t *dd)
171 for (i = ENUM_IDE; i < ENUM_MAX; i++)
172 for (j = 0; j < specs[i].max_dev; j++)
173 if (dd == get_dev(specs[i].name, j))
181 * returns: 0/1 whether cookie points to some device in this group
183 static int dev_is_stor(int type, struct device_info *di)
185 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
189 static int dev_enum_stor(int type, struct device_info *di)
191 int found = 0, more = 0;
193 debugf("called, type %d\n", type);
196 * Formulae for enumerating storage devices:
197 * 1. if cookie (hint from previous enum call) is NULL we start again
198 * with enumeration, so return the first available device, done.
200 * 2. if cookie is not NULL, check if it identifies some device in
203 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
204 * return next available (if exists) in this group
206 * 2b. if it isn't device from our group, check if such devices were
207 * ever enumerated before:
208 * - if not, return the first available device from this group
212 if (di->cookie == NULL) {
214 debugf("group%d - enum restart\n", type);
217 * 1. Enumeration (re-)started: take the first available
220 found = dev_stor_get(type, 1, &more, di);
221 specs[type].enum_started = 1;
223 } else if (dev_is_stor(type, di)) {
225 debugf("group%d - enum continued for the next device\n", type);
227 if (specs[type].enum_ended) {
228 debugf("group%d - nothing more to enum!\n", type);
232 /* 2a. Attempt to take a next available device in the group */
233 found = dev_stor_get(type, 0, &more, di);
237 if (specs[type].enum_ended) {
238 debugf("group %d - already enumerated, skipping\n", type);
242 debugf("group%d - first time enum\n", type);
244 if (specs[type].enum_started == 0) {
246 * 2b. If enumerating devices in this group did not
247 * happen before, it means the cookie pointed to a
248 * device frome some other group (another storage
249 * group, or network); in this case try to take the
250 * first available device from our group
252 specs[type].enum_started = 1;
255 * Attempt to take the first device in this group:
256 *'first element' flag is set
258 found = dev_stor_get(type, 1, &more, di);
261 errf("group%d - out of order iteration\n", type);
268 * If there are no more devices in this group, consider its
269 * enumeration finished
271 specs[type].enum_ended = (!more) ? 1 : 0;
274 debugf("device found, returning cookie 0x%08x\n",
275 (u_int32_t)di->cookie);
277 debugf("no device found\n");
282 void dev_enum_reset(void)
286 for (i = 0; i < ENUM_MAX; i ++) {
287 specs[i].enum_started = 0;
288 specs[i].enum_ended = 0;
292 int dev_enum_storage(struct device_info *di)
297 * check: ide, usb, scsi, mmc
299 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
300 if (dev_enum_stor(i, di))
307 static int dev_stor_is_valid(int type, block_dev_desc_t *dd)
311 for (i = 0; i < specs[type].max_dev; i++)
312 if (dd == get_dev(specs[type].name, i))
313 if (dd->type != DEV_TYPE_UNKNOWN)
320 int dev_open_stor(void *cookie)
322 int type = dev_stor_type(cookie);
324 if (type == ENUM_MAX)
327 if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie))
334 int dev_close_stor(void *cookie)
337 * Not much to do as we actually do not alter storage devices upon
344 static int dev_stor_index(block_dev_desc_t *dd)
348 type = dev_stor_type(dd);
349 for (i = 0; i < specs[type].max_dev; i++)
350 if (dd == get_dev(specs[type].name, i))
353 return (specs[type].max_dev);
357 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
360 block_dev_desc_t *dd = (block_dev_desc_t *)cookie;
362 if ((type = dev_stor_type(dd)) == ENUM_MAX)
365 if (!dev_stor_is_valid(type, dd))
368 if ((dd->block_read) == NULL) {
369 debugf("no block_read() for device 0x%08x\n", cookie);
373 return (dd->block_read(dev_stor_index(dd), start, len, buf));
376 #endif /* CONFIG_API */