1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2007-2008 Semihalf
5 * Written by: Rafal Jaworowski <raj@semihalf.com>
10 #include <api_public.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)
41 int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
45 static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, NULL }, };
47 #ifndef CONFIG_SYS_MMC_MAX_DEVICE
48 #define CONFIG_SYS_MMC_MAX_DEVICE 1
51 void dev_stor_init(void)
53 #if defined(CONFIG_IDE)
54 specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
55 specs[ENUM_IDE].enum_started = 0;
56 specs[ENUM_IDE].enum_ended = 0;
57 specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
58 specs[ENUM_IDE].name = "ide";
60 #if defined(CONFIG_CMD_MMC)
61 specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
62 specs[ENUM_MMC].enum_started = 0;
63 specs[ENUM_MMC].enum_ended = 0;
64 specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC;
65 specs[ENUM_MMC].name = "mmc";
67 #if defined(CONFIG_SATA)
68 specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
69 specs[ENUM_SATA].enum_started = 0;
70 specs[ENUM_SATA].enum_ended = 0;
71 specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
72 specs[ENUM_SATA].name = "sata";
74 #if defined(CONFIG_SCSI)
75 specs[ENUM_SCSI].max_dev = SCSI_MAX_DEVICE;
76 specs[ENUM_SCSI].enum_started = 0;
77 specs[ENUM_SCSI].enum_ended = 0;
78 specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
79 specs[ENUM_SCSI].name = "scsi";
81 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
82 specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
83 specs[ENUM_USB].enum_started = 0;
84 specs[ENUM_USB].enum_ended = 0;
85 specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
86 specs[ENUM_USB].name = "usb";
91 * Finds next available device in the storage group
93 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
95 * more: returns 0/1 depending if there are more devices in this group
96 * available (for future iterations)
98 * returns: 0/1 depending if device found in this iteration
100 static int dev_stor_get(int type, int *more, struct device_info *di)
107 /* Wasn't configured for this type, return 0 directly */
108 if (specs[type].name == NULL)
111 if (di->cookie != NULL) {
112 /* Find the last device we've returned */
113 for (i = 0; i < specs[type].max_dev; i++) {
115 (void *)blk_get_dev(specs[type].name, i)) {
126 for (; i < specs[type].max_dev; i++) {
127 di->cookie = (void *)blk_get_dev(specs[type].name, i);
129 if (di->cookie != NULL) {
135 if (i == specs[type].max_dev)
141 di->type = specs[type].type;
143 dd = (struct blk_desc *)di->cookie;
144 if (dd->type == DEV_TYPE_UNKNOWN) {
145 debugf("device instance exists, but is not active..");
148 di->di_stor.block_count = dd->lba;
149 di->di_stor.block_size = dd->blksz;
159 /* returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc */
161 static int dev_stor_type(struct blk_desc *dd)
165 for (i = ENUM_IDE; i < ENUM_MAX; i++)
166 for (j = 0; j < specs[i].max_dev; j++)
167 if (dd == blk_get_dev(specs[i].name, j))
174 /* returns: 0/1 whether cookie points to some device in this group */
176 static int dev_is_stor(int type, struct device_info *di)
178 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
182 static int dev_enum_stor(int type, struct device_info *di)
184 int found = 0, more = 0;
186 debugf("called, type %d\n", type);
189 * Formulae for enumerating storage devices:
190 * 1. if cookie (hint from previous enum call) is NULL we start again
191 * with enumeration, so return the first available device, done.
193 * 2. if cookie is not NULL, check if it identifies some device in
196 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
197 * return next available (if exists) in this group
199 * 2b. if it isn't device from our group, check if such devices were
200 * ever enumerated before:
201 * - if not, return the first available device from this group
205 if (di->cookie == NULL) {
206 debugf("group%d - enum restart\n", type);
209 * 1. Enumeration (re-)started: take the first available
212 found = dev_stor_get(type, &more, di);
213 specs[type].enum_started = 1;
215 } else if (dev_is_stor(type, di)) {
216 debugf("group%d - enum continued for the next device\n", type);
218 if (specs[type].enum_ended) {
219 debugf("group%d - nothing more to enum!\n", type);
223 /* 2a. Attempt to take a next available device in the group */
224 found = dev_stor_get(type, &more, di);
227 if (specs[type].enum_ended) {
228 debugf("group %d - already enumerated, skipping\n", type);
232 debugf("group%d - first time enum\n", type);
234 if (specs[type].enum_started == 0) {
236 * 2b. If enumerating devices in this group did not
237 * happen before, it means the cookie pointed to a
238 * device from some other group (another storage
239 * group, or network); in this case try to take the
240 * first available device from our group
242 specs[type].enum_started = 1;
245 * Attempt to take the first device in this group:
246 *'first element' flag is set
248 found = dev_stor_get(type, &more, di);
251 errf("group%d - out of order iteration\n", type);
258 * If there are no more devices in this group, consider its
259 * enumeration finished
261 specs[type].enum_ended = (!more) ? 1 : 0;
264 debugf("device found, returning cookie 0x%08x\n",
265 (u_int32_t)di->cookie);
267 debugf("no device found\n");
272 void dev_enum_reset(void)
276 for (i = 0; i < ENUM_MAX; i ++) {
277 specs[i].enum_started = 0;
278 specs[i].enum_ended = 0;
282 int dev_enum_storage(struct device_info *di)
286 /* check: ide, usb, scsi, mmc */
287 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
288 if (dev_enum_stor(i, di))
295 static int dev_stor_is_valid(int type, struct blk_desc *dd)
299 for (i = 0; i < specs[type].max_dev; i++)
300 if (dd == blk_get_dev(specs[type].name, i))
301 if (dd->type != DEV_TYPE_UNKNOWN)
308 int dev_open_stor(void *cookie)
310 int type = dev_stor_type(cookie);
312 if (type == ENUM_MAX)
315 if (dev_stor_is_valid(type, (struct blk_desc *)cookie))
322 int dev_close_stor(void *cookie)
325 * Not much to do as we actually do not alter storage devices upon
332 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
335 struct blk_desc *dd = (struct blk_desc *)cookie;
337 if ((type = dev_stor_type(dd)) == ENUM_MAX)
340 if (!dev_stor_is_valid(type, dd))
344 return blk_dread(dd, start, len, buf);
346 if ((dd->block_read) == NULL) {
347 debugf("no block_read() for device 0x%08x\n", cookie);
351 return dd->block_read(dd, start, len, buf);
352 #endif /* defined(CONFIG_BLK) */
356 lbasize_t dev_write_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
358 struct blk_desc *dd = (struct blk_desc *)cookie;
359 int type = dev_stor_type(dd);
361 if (type == ENUM_MAX)
364 if (!dev_stor_is_valid(type, dd))
368 return blk_dwrite(dd, start, len, buf);
370 if (dd->block_write == NULL) {
371 debugf("no block_write() for device 0x%08x\n", cookie);
375 return dd->block_write(dd, start, len, buf);
376 #endif /* defined(CONFIG_BLK) */