2 * (C) Copyright 2007-2008 Semihalf
4 * Written by: Rafal Jaworowski <raj@semihalf.com>
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <api_public.h>
13 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
21 #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
23 #define debugf(fmt, args...)
26 #define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
40 int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
44 static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, };
47 void dev_stor_init(void)
49 #if defined(CONFIG_CMD_IDE)
50 specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
51 specs[ENUM_IDE].enum_started = 0;
52 specs[ENUM_IDE].enum_ended = 0;
53 specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
54 specs[ENUM_IDE].name = "ide";
56 #if defined(CONFIG_CMD_MMC)
57 specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
58 specs[ENUM_MMC].enum_started = 0;
59 specs[ENUM_MMC].enum_ended = 0;
60 specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC;
61 specs[ENUM_MMC].name = "mmc";
63 #if defined(CONFIG_CMD_SATA)
64 specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
65 specs[ENUM_SATA].enum_started = 0;
66 specs[ENUM_SATA].enum_ended = 0;
67 specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
68 specs[ENUM_SATA].name = "sata";
70 #if defined(CONFIG_CMD_SCSI)
71 specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE;
72 specs[ENUM_SCSI].enum_started = 0;
73 specs[ENUM_SCSI].enum_ended = 0;
74 specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
75 specs[ENUM_SCSI].name = "scsi";
77 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
78 specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
79 specs[ENUM_USB].enum_started = 0;
80 specs[ENUM_USB].enum_ended = 0;
81 specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
82 specs[ENUM_USB].name = "usb";
87 * Finds next available device in the storage group
89 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
91 * first: if 1 the first device in the storage group is returned (if
92 * exists), if 0 the next available device is searched
94 * more: returns 0/1 depending if there are more devices in this group
95 * available (for future iterations)
97 * returns: 0/1 depending if device found in this iteration
99 static int dev_stor_get(int type, int first, int *more, struct device_info *di)
109 di->cookie = (void *)blk_get_dev(specs[type].name, 0);
110 if (di->cookie == NULL)
115 /* provide hint if there are more devices in
116 * this group to enumerate */
117 if (1 < specs[type].max_dev)
121 for (i = 0; i < specs[type].max_dev; i++)
123 (void *)blk_get_dev(specs[type].name, i)) {
124 /* previous cookie found -- advance to the
125 * next device, if possible */
127 if (++i >= specs[type].max_dev) {
128 /* out of range, no more to enum */
133 di->cookie = (void *)blk_get_dev(
134 specs[type].name, i);
135 if (di->cookie == NULL)
140 /* provide hint if there are more devices in
141 * this group to enumerate */
142 if ((i + 1) < specs[type].max_dev)
150 di->type = specs[type].type;
152 if (di->cookie != NULL) {
153 dd = (struct blk_desc *)di->cookie;
154 if (dd->type == DEV_TYPE_UNKNOWN) {
155 debugf("device instance exists, but is not active..");
158 di->di_stor.block_count = dd->lba;
159 di->di_stor.block_size = dd->blksz;
171 * returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc
173 static int dev_stor_type(struct blk_desc *dd)
177 for (i = ENUM_IDE; i < ENUM_MAX; i++)
178 for (j = 0; j < specs[i].max_dev; j++)
179 if (dd == blk_get_dev(specs[i].name, j))
187 * returns: 0/1 whether cookie points to some device in this group
189 static int dev_is_stor(int type, struct device_info *di)
191 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
195 static int dev_enum_stor(int type, struct device_info *di)
197 int found = 0, more = 0;
199 debugf("called, type %d\n", type);
202 * Formulae for enumerating storage devices:
203 * 1. if cookie (hint from previous enum call) is NULL we start again
204 * with enumeration, so return the first available device, done.
206 * 2. if cookie is not NULL, check if it identifies some device in
209 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
210 * return next available (if exists) in this group
212 * 2b. if it isn't device from our group, check if such devices were
213 * ever enumerated before:
214 * - if not, return the first available device from this group
218 if (di->cookie == NULL) {
220 debugf("group%d - enum restart\n", type);
223 * 1. Enumeration (re-)started: take the first available
226 found = dev_stor_get(type, 1, &more, di);
227 specs[type].enum_started = 1;
229 } else if (dev_is_stor(type, di)) {
231 debugf("group%d - enum continued for the next device\n", type);
233 if (specs[type].enum_ended) {
234 debugf("group%d - nothing more to enum!\n", type);
238 /* 2a. Attempt to take a next available device in the group */
239 found = dev_stor_get(type, 0, &more, di);
243 if (specs[type].enum_ended) {
244 debugf("group %d - already enumerated, skipping\n", type);
248 debugf("group%d - first time enum\n", type);
250 if (specs[type].enum_started == 0) {
252 * 2b. If enumerating devices in this group did not
253 * happen before, it means the cookie pointed to a
254 * device frome some other group (another storage
255 * group, or network); in this case try to take the
256 * first available device from our group
258 specs[type].enum_started = 1;
261 * Attempt to take the first device in this group:
262 *'first element' flag is set
264 found = dev_stor_get(type, 1, &more, di);
267 errf("group%d - out of order iteration\n", type);
274 * If there are no more devices in this group, consider its
275 * enumeration finished
277 specs[type].enum_ended = (!more) ? 1 : 0;
280 debugf("device found, returning cookie 0x%08x\n",
281 (u_int32_t)di->cookie);
283 debugf("no device found\n");
288 void dev_enum_reset(void)
292 for (i = 0; i < ENUM_MAX; i ++) {
293 specs[i].enum_started = 0;
294 specs[i].enum_ended = 0;
298 int dev_enum_storage(struct device_info *di)
303 * check: ide, usb, scsi, mmc
305 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
306 if (dev_enum_stor(i, di))
313 static int dev_stor_is_valid(int type, struct blk_desc *dd)
317 for (i = 0; i < specs[type].max_dev; i++)
318 if (dd == blk_get_dev(specs[type].name, i))
319 if (dd->type != DEV_TYPE_UNKNOWN)
326 int dev_open_stor(void *cookie)
328 int type = dev_stor_type(cookie);
330 if (type == ENUM_MAX)
333 if (dev_stor_is_valid(type, (struct blk_desc *)cookie))
340 int dev_close_stor(void *cookie)
343 * Not much to do as we actually do not alter storage devices upon
350 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
353 struct blk_desc *dd = (struct blk_desc *)cookie;
355 if ((type = dev_stor_type(dd)) == ENUM_MAX)
358 if (!dev_stor_is_valid(type, dd))
361 if ((dd->block_read) == NULL) {
362 debugf("no block_read() for device 0x%08x\n", cookie);
366 return dd->block_read(dd, start, len, buf);