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 #include <api_public.h>
30 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
38 #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
40 #define debugf(fmt, args...)
43 #define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
57 int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
61 static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };
64 void dev_stor_init(void)
66 #if defined(CONFIG_CMD_IDE)
67 specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
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";
73 #if defined(CONFIG_CMD_MMC)
74 specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
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";
80 #if defined(CONFIG_CMD_SATA)
81 specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
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";
87 #if defined(CONFIG_CMD_SCSI)
88 specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE;
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";
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";
104 * Finds next available device in the storage group
106 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
108 * first: if 1 the first device in the storage group is returned (if
109 * exists), if 0 the next available device is searched
111 * more: returns 0/1 depending if there are more devices in this group
112 * available (for future iterations)
114 * returns: 0/1 depending if device found in this iteration
116 static int dev_stor_get(int type, int first, int *more, struct device_info *di)
123 block_dev_desc_t *dd;
126 di->cookie = (void *)get_dev(specs[type].name, 0);
127 if (di->cookie == NULL)
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 */
138 if (++i >= specs[type].max_dev) {
139 /* out of range, no more to enum */
144 di->cookie = (void *)get_dev(specs[type].name, i);
145 if (di->cookie == NULL)
150 /* provide hint if there are more devices in
151 * this group to enumerate */
152 if ((i + 1) < specs[type].max_dev)
160 di->type = specs[type].type;
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..");
168 di->di_stor.block_count = dd->lba;
169 di->di_stor.block_size = dd->blksz;
181 * returns: ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t
183 static int dev_stor_type(block_dev_desc_t *dd)
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))
197 * returns: 0/1 whether cookie points to some device in this group
199 static int dev_is_stor(int type, struct device_info *di)
201 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
205 static int dev_enum_stor(int type, struct device_info *di)
207 int found = 0, more = 0;
209 debugf("called, type %d\n", type);
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.
216 * 2. if cookie is not NULL, check if it identifies some device in
219 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
220 * return next available (if exists) in this group
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
228 if (di->cookie == NULL) {
230 debugf("group%d - enum restart\n", type);
233 * 1. Enumeration (re-)started: take the first available
236 found = dev_stor_get(type, 1, &more, di);
237 specs[type].enum_started = 1;
239 } else if (dev_is_stor(type, di)) {
241 debugf("group%d - enum continued for the next device\n", type);
243 if (specs[type].enum_ended) {
244 debugf("group%d - nothing more to enum!\n", type);
248 /* 2a. Attempt to take a next available device in the group */
249 found = dev_stor_get(type, 0, &more, di);
253 if (specs[type].enum_ended) {
254 debugf("group %d - already enumerated, skipping\n", type);
258 debugf("group%d - first time enum\n", type);
260 if (specs[type].enum_started == 0) {
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
268 specs[type].enum_started = 1;
271 * Attempt to take the first device in this group:
272 *'first element' flag is set
274 found = dev_stor_get(type, 1, &more, di);
277 errf("group%d - out of order iteration\n", type);
284 * If there are no more devices in this group, consider its
285 * enumeration finished
287 specs[type].enum_ended = (!more) ? 1 : 0;
290 debugf("device found, returning cookie 0x%08x\n",
291 (u_int32_t)di->cookie);
293 debugf("no device found\n");
298 void dev_enum_reset(void)
302 for (i = 0; i < ENUM_MAX; i ++) {
303 specs[i].enum_started = 0;
304 specs[i].enum_ended = 0;
308 int dev_enum_storage(struct device_info *di)
313 * check: ide, usb, scsi, mmc
315 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
316 if (dev_enum_stor(i, di))
323 static int dev_stor_is_valid(int type, block_dev_desc_t *dd)
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)
336 int dev_open_stor(void *cookie)
338 int type = dev_stor_type(cookie);
340 if (type == ENUM_MAX)
343 if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie))
350 int dev_close_stor(void *cookie)
353 * Not much to do as we actually do not alter storage devices upon
360 static int dev_stor_index(block_dev_desc_t *dd)
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))
369 return (specs[type].max_dev);
373 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
376 block_dev_desc_t *dd = (block_dev_desc_t *)cookie;
378 if ((type = dev_stor_type(dd)) == ENUM_MAX)
381 if (!dev_stor_is_valid(type, dd))
384 if ((dd->block_read) == NULL) {
385 debugf("no block_read() for device 0x%08x\n", cookie);
389 return (dd->block_read(dev_stor_index(dd), start, len, buf));