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)
106 block_dev_desc_t *dd;
109 di->cookie = (void *)get_dev(specs[type].name, 0);
110 if (di->cookie == NULL)
116 for (i = 0; i < specs[type].max_dev; i++)
117 if (di->cookie == (void *)get_dev(specs[type].name, i)) {
118 /* previous cookie found -- advance to the
119 * next device, if possible */
121 if (++i >= specs[type].max_dev) {
122 /* out of range, no more to enum */
127 di->cookie = (void *)get_dev(specs[type].name, i);
128 if (di->cookie == NULL)
133 /* provide hint if there are more devices in
134 * this group to enumerate */
135 if ((i + 1) < specs[type].max_dev)
143 di->type = specs[type].type;
145 if (di->cookie != NULL) {
146 dd = (block_dev_desc_t *)di->cookie;
147 if (dd->type == DEV_TYPE_UNKNOWN) {
148 debugf("device instance exists, but is not active..");
151 di->di_stor.block_count = dd->lba;
152 di->di_stor.block_size = dd->blksz;
164 * returns: ENUM_IDE, ENUM_USB etc. based on block_dev_desc_t
166 static int dev_stor_type(block_dev_desc_t *dd)
170 for (i = ENUM_IDE; i < ENUM_MAX; i++)
171 for (j = 0; j < specs[i].max_dev; j++)
172 if (dd == get_dev(specs[i].name, j))
180 * returns: 0/1 whether cookie points to some device in this group
182 static int dev_is_stor(int type, struct device_info *di)
184 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
188 static int dev_enum_stor(int type, struct device_info *di)
190 int found = 0, more = 0;
192 debugf("called, type %d\n", type);
195 * Formulae for enumerating storage devices:
196 * 1. if cookie (hint from previous enum call) is NULL we start again
197 * with enumeration, so return the first available device, done.
199 * 2. if cookie is not NULL, check if it identifies some device in
202 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
203 * return next available (if exists) in this group
205 * 2b. if it isn't device from our group, check if such devices were
206 * ever enumerated before:
207 * - if not, return the first available device from this group
211 if (di->cookie == NULL) {
213 debugf("group%d - enum restart\n", type);
216 * 1. Enumeration (re-)started: take the first available
219 found = dev_stor_get(type, 1, &more, di);
220 specs[type].enum_started = 1;
222 } else if (dev_is_stor(type, di)) {
224 debugf("group%d - enum continued for the next device\n", type);
226 if (specs[type].enum_ended) {
227 debugf("group%d - nothing more to enum!\n", type);
231 /* 2a. Attempt to take a next available device in the group */
232 found = dev_stor_get(type, 0, &more, di);
236 if (specs[type].enum_ended) {
237 debugf("group %d - already enumerated, skipping\n", type);
241 debugf("group%d - first time enum\n", type);
243 if (specs[type].enum_started == 0) {
245 * 2b. If enumerating devices in this group did not
246 * happen before, it means the cookie pointed to a
247 * device frome some other group (another storage
248 * group, or network); in this case try to take the
249 * first available device from our group
251 specs[type].enum_started = 1;
254 * Attempt to take the first device in this group:
255 *'first element' flag is set
257 found = dev_stor_get(type, 1, &more, di);
260 errf("group%d - out of order iteration\n", type);
267 * If there are no more devices in this group, consider its
268 * enumeration finished
270 specs[type].enum_ended = (!more) ? 1 : 0;
273 debugf("device found, returning cookie 0x%08x\n",
274 (u_int32_t)di->cookie);
276 debugf("no device found\n");
281 void dev_enum_reset(void)
285 for (i = 0; i < ENUM_MAX; i ++) {
286 specs[i].enum_started = 0;
287 specs[i].enum_ended = 0;
291 int dev_enum_storage(struct device_info *di)
296 * check: ide, usb, scsi, mmc
298 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
299 if (dev_enum_stor(i, di))
306 static int dev_stor_is_valid(int type, block_dev_desc_t *dd)
310 for (i = 0; i < specs[type].max_dev; i++)
311 if (dd == get_dev(specs[type].name, i))
312 if (dd->type != DEV_TYPE_UNKNOWN)
319 int dev_open_stor(void *cookie)
321 int type = dev_stor_type(cookie);
323 if (type == ENUM_MAX)
326 if (dev_stor_is_valid(type, (block_dev_desc_t *)cookie))
333 int dev_close_stor(void *cookie)
336 * Not much to do as we actually do not alter storage devices upon
343 static int dev_stor_index(block_dev_desc_t *dd)
347 type = dev_stor_type(dd);
348 for (i = 0; i < specs[type].max_dev; i++)
349 if (dd == get_dev(specs[type].name, i))
352 return (specs[type].max_dev);
356 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
359 block_dev_desc_t *dd = (block_dev_desc_t *)cookie;
361 if ((type = dev_stor_type(dd)) == ENUM_MAX)
364 if (!dev_stor_is_valid(type, dd))
367 if ((dd->block_read) == NULL) {
368 debugf("no block_read() for device 0x%08x\n", cookie);
372 return (dd->block_read(dev_stor_index(dd), start, len, buf));