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>
33 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
41 #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
43 #define debugf(fmt, args...)
46 #define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
60 int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
64 static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };
67 void dev_stor_init(void)
69 #if defined(CONFIG_CMD_IDE)
70 specs[ENUM_IDE].max_dev = CONFIG_SYS_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";
76 #if defined(CONFIG_CMD_MMC)
77 specs[ENUM_MMC].max_dev = CONFIG_SYS_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";
83 #if defined(CONFIG_CMD_SATA)
84 specs[ENUM_SATA].max_dev = CONFIG_SYS_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";
90 #if defined(CONFIG_CMD_SCSI)
91 specs[ENUM_SCSI].max_dev = CONFIG_SYS_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";
97 #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";
107 * Finds next available device in the storage group
109 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
111 * first: if 1 the first device in the storage group is returned (if
112 * exists), if 0 the next available device is searched
114 * more: returns 0/1 depending if there are more devices in this group
115 * available (for future iterations)
117 * returns: 0/1 depending if device found in this iteration
119 static int dev_stor_get(int type, int first, int *more, struct device_info *di)
126 block_dev_desc_t *dd;
129 di->cookie = (void *)get_dev(specs[type].name, 0);
130 if (di->cookie == NULL)
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 */
141 if (++i >= specs[type].max_dev) {
142 /* out of range, no more to enum */
147 di->cookie = (void *)get_dev(specs[type].name, i);
148 if (di->cookie == NULL)
153 /* provide hint if there are more devices in
154 * this group to enumerate */
155 if ((i + 1) < specs[type].max_dev)
163 di->type = specs[type].type;
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..");
171 di->di_stor.block_count = dd->lba;
172 di->di_stor.block_size = dd->blksz;
184 * returns: ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t
186 static int dev_stor_type(block_dev_desc_t *dd)
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))
200 * returns: 0/1 whether cookie points to some device in this group
202 static int dev_is_stor(int type, struct device_info *di)
204 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
208 static int dev_enum_stor(int type, struct device_info *di)
210 int found = 0, more = 0;
212 debugf("called, type %d\n", type);
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.
219 * 2. if cookie is not NULL, check if it identifies some device in
222 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
223 * return next available (if exists) in this group
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
231 if (di->cookie == NULL) {
233 debugf("group%d - enum restart\n", type);
236 * 1. Enumeration (re-)started: take the first available
239 found = dev_stor_get(type, 1, &more, di);
240 specs[type].enum_started = 1;
242 } else if (dev_is_stor(type, di)) {
244 debugf("group%d - enum continued for the next device\n", type);
246 if (specs[type].enum_ended) {
247 debugf("group%d - nothing more to enum!\n", type);
251 /* 2a. Attempt to take a next available device in the group */
252 found = dev_stor_get(type, 0, &more, di);
256 if (specs[type].enum_ended) {
257 debugf("group %d - already enumerated, skipping\n", type);
261 debugf("group%d - first time enum\n", type);
263 if (specs[type].enum_started == 0) {
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
271 specs[type].enum_started = 1;
274 * Attempt to take the first device in this group:
275 *'first element' flag is set
277 found = dev_stor_get(type, 1, &more, di);
280 errf("group%d - out of order iteration\n", type);
287 * If there are no more devices in this group, consider its
288 * enumeration finished
290 specs[type].enum_ended = (!more) ? 1 : 0;
293 debugf("device found, returning cookie 0x%08x\n",
294 (u_int32_t)di->cookie);
296 debugf("no device found\n");
301 void dev_enum_reset(void)
305 for (i = 0; i < ENUM_MAX; i ++) {
306 specs[i].enum_started = 0;
307 specs[i].enum_ended = 0;
311 int dev_enum_storage(struct device_info *di)
316 * check: ide, usb, scsi, mmc
318 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
319 if (dev_enum_stor(i, di))
326 static int dev_stor_is_valid(int type, block_dev_desc_t *dd)
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)
339 int dev_open_stor(void *cookie)
341 int type = dev_stor_type(cookie);
343 if (type == ENUM_MAX)
346 if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie))
353 int dev_close_stor(void *cookie)
356 * Not much to do as we actually do not alter storage devices upon
363 static int dev_stor_index(block_dev_desc_t *dd)
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))
372 return (specs[type].max_dev);
376 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
379 block_dev_desc_t *dd = (block_dev_desc_t *)cookie;
381 if ((type = dev_stor_type(dd)) == ENUM_MAX)
384 if (!dev_stor_is_valid(type, dd))
387 if ((dd->block_read) == NULL) {
388 debugf("no block_read() for device 0x%08x\n", cookie);
392 return (dd->block_read(dev_stor_index(dd), start, len, buf));
395 #endif /* CONFIG_API */