1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2007-2008 Semihalf
5 * Written by: Rafal Jaworowski <raj@semihalf.com>
9 #include <api_public.h>
12 #include <linux/types.h>
14 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
22 #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
24 #define debugf(fmt, args...)
27 #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, NULL }, };
46 void dev_stor_init(void)
48 #if defined(CONFIG_IDE)
49 specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
50 specs[ENUM_IDE].enum_started = 0;
51 specs[ENUM_IDE].enum_ended = 0;
52 specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
53 specs[ENUM_IDE].name = "ide";
55 #if defined(CONFIG_CMD_MMC)
56 specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
57 specs[ENUM_MMC].enum_started = 0;
58 specs[ENUM_MMC].enum_ended = 0;
59 specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC;
60 specs[ENUM_MMC].name = "mmc";
62 #if defined(CONFIG_SATA)
63 specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
64 specs[ENUM_SATA].enum_started = 0;
65 specs[ENUM_SATA].enum_ended = 0;
66 specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
67 specs[ENUM_SATA].name = "sata";
69 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
70 specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
71 specs[ENUM_USB].enum_started = 0;
72 specs[ENUM_USB].enum_ended = 0;
73 specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
74 specs[ENUM_USB].name = "usb";
79 * Finds next available device in the storage group
81 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
83 * more: returns 0/1 depending if there are more devices in this group
84 * available (for future iterations)
86 * returns: 0/1 depending if device found in this iteration
88 static int dev_stor_get(int type, int *more, struct device_info *di)
95 /* Wasn't configured for this type, return 0 directly */
96 if (specs[type].name == NULL)
99 if (di->cookie != NULL) {
100 /* Find the last device we've returned */
101 for (i = 0; i < specs[type].max_dev; i++) {
103 (void *)blk_get_dev(specs[type].name, i)) {
114 for (; i < specs[type].max_dev; i++) {
115 di->cookie = (void *)blk_get_dev(specs[type].name, i);
117 if (di->cookie != NULL) {
123 if (i == specs[type].max_dev)
129 di->type = specs[type].type;
131 dd = (struct blk_desc *)di->cookie;
132 if (dd->type == DEV_TYPE_UNKNOWN) {
133 debugf("device instance exists, but is not active..");
136 di->di_stor.block_count = dd->lba;
137 di->di_stor.block_size = dd->blksz;
146 /* returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc */
148 static int dev_stor_type(struct blk_desc *dd)
152 for (i = ENUM_IDE; i < ENUM_MAX; i++)
153 for (j = 0; j < specs[i].max_dev; j++)
154 if (dd == blk_get_dev(specs[i].name, j))
160 /* returns: 0/1 whether cookie points to some device in this group */
162 static int dev_is_stor(int type, struct device_info *di)
164 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
167 static int dev_enum_stor(int type, struct device_info *di)
169 int found = 0, more = 0;
171 debugf("called, type %d\n", type);
174 * Formulae for enumerating storage devices:
175 * 1. if cookie (hint from previous enum call) is NULL we start again
176 * with enumeration, so return the first available device, done.
178 * 2. if cookie is not NULL, check if it identifies some device in
181 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
182 * return next available (if exists) in this group
184 * 2b. if it isn't device from our group, check if such devices were
185 * ever enumerated before:
186 * - if not, return the first available device from this group
190 if (di->cookie == NULL) {
191 debugf("group%d - enum restart\n", type);
194 * 1. Enumeration (re-)started: take the first available
197 found = dev_stor_get(type, &more, di);
198 specs[type].enum_started = 1;
200 } else if (dev_is_stor(type, di)) {
201 debugf("group%d - enum continued for the next device\n", type);
203 if (specs[type].enum_ended) {
204 debugf("group%d - nothing more to enum!\n", type);
208 /* 2a. Attempt to take a next available device in the group */
209 found = dev_stor_get(type, &more, di);
212 if (specs[type].enum_ended) {
213 debugf("group %d - already enumerated, skipping\n", type);
217 debugf("group%d - first time enum\n", type);
219 if (specs[type].enum_started == 0) {
221 * 2b. If enumerating devices in this group did not
222 * happen before, it means the cookie pointed to a
223 * device from some other group (another storage
224 * group, or network); in this case try to take the
225 * first available device from our group
227 specs[type].enum_started = 1;
230 * Attempt to take the first device in this group:
231 *'first element' flag is set
233 found = dev_stor_get(type, &more, di);
236 errf("group%d - out of order iteration\n", type);
243 * If there are no more devices in this group, consider its
244 * enumeration finished
246 specs[type].enum_ended = (!more) ? 1 : 0;
249 debugf("device found, returning cookie 0x%08x\n",
250 (u_int32_t)di->cookie);
252 debugf("no device found\n");
257 void dev_enum_reset(void)
261 for (i = 0; i < ENUM_MAX; i ++) {
262 specs[i].enum_started = 0;
263 specs[i].enum_ended = 0;
267 int dev_enum_storage(struct device_info *di)
271 /* check: ide, usb, scsi, mmc */
272 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
273 if (dev_enum_stor(i, di))
280 static int dev_stor_is_valid(int type, struct blk_desc *dd)
284 for (i = 0; i < specs[type].max_dev; i++)
285 if (dd == blk_get_dev(specs[type].name, i))
286 if (dd->type != DEV_TYPE_UNKNOWN)
292 int dev_open_stor(void *cookie)
294 int type = dev_stor_type(cookie);
296 if (type == ENUM_MAX)
299 if (dev_stor_is_valid(type, (struct blk_desc *)cookie))
305 int dev_close_stor(void *cookie)
308 * Not much to do as we actually do not alter storage devices upon
314 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
317 struct blk_desc *dd = (struct blk_desc *)cookie;
319 if ((type = dev_stor_type(dd)) == ENUM_MAX)
322 if (!dev_stor_is_valid(type, dd))
326 return blk_dread(dd, start, len, buf);
328 if ((dd->block_read) == NULL) {
329 debugf("no block_read() for device 0x%08x\n", cookie);
333 return dd->block_read(dd, start, len, buf);
334 #endif /* defined(CONFIG_BLK) */
337 lbasize_t dev_write_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
339 struct blk_desc *dd = (struct blk_desc *)cookie;
340 int type = dev_stor_type(dd);
342 if (type == ENUM_MAX)
345 if (!dev_stor_is_valid(type, dd))
349 return blk_dwrite(dd, start, len, buf);
351 if (dd->block_write == NULL) {
352 debugf("no block_write() for device 0x%08x\n", cookie);
356 return dd->block_write(dd, start, len, buf);
357 #endif /* defined(CONFIG_BLK) */