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, NULL }, };
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_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 * more: returns 0/1 depending if there are more devices in this group
92 * available (for future iterations)
94 * returns: 0/1 depending if device found in this iteration
96 static int dev_stor_get(int type, int *more, struct device_info *di)
102 /* Wasn't configured for this type, return 0 directly */
103 if (specs[type].name == NULL)
106 if (di->cookie != NULL) {
107 /* Find the last device we've returned */
108 for (i = 0; i < specs[type].max_dev; i++) {
110 (void *)blk_get_dev(specs[type].name, i)) {
117 for (; i < specs[type].max_dev; i++) {
118 di->cookie = (void *)blk_get_dev(specs[type].name, i);
120 if (di->cookie != NULL) {
126 if (i == specs[type].max_dev)
132 di->type = specs[type].type;
134 dd = (struct blk_desc *)di->cookie;
135 if (dd->type == DEV_TYPE_UNKNOWN) {
136 debugf("device instance exists, but is not active..");
139 di->di_stor.block_count = dd->lba;
140 di->di_stor.block_size = dd->blksz;
150 /* returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc */
152 static int dev_stor_type(struct blk_desc *dd)
156 for (i = ENUM_IDE; i < ENUM_MAX; i++)
157 for (j = 0; j < specs[i].max_dev; j++)
158 if (dd == blk_get_dev(specs[i].name, j))
165 /* returns: 0/1 whether cookie points to some device in this group */
167 static int dev_is_stor(int type, struct device_info *di)
169 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
173 static int dev_enum_stor(int type, struct device_info *di)
175 int found = 0, more = 0;
177 debugf("called, type %d\n", type);
180 * Formulae for enumerating storage devices:
181 * 1. if cookie (hint from previous enum call) is NULL we start again
182 * with enumeration, so return the first available device, done.
184 * 2. if cookie is not NULL, check if it identifies some device in
187 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
188 * return next available (if exists) in this group
190 * 2b. if it isn't device from our group, check if such devices were
191 * ever enumerated before:
192 * - if not, return the first available device from this group
196 if (di->cookie == NULL) {
197 debugf("group%d - enum restart\n", type);
200 * 1. Enumeration (re-)started: take the first available
203 found = dev_stor_get(type, &more, di);
204 specs[type].enum_started = 1;
206 } else if (dev_is_stor(type, di)) {
207 debugf("group%d - enum continued for the next device\n", type);
209 if (specs[type].enum_ended) {
210 debugf("group%d - nothing more to enum!\n", type);
214 /* 2a. Attempt to take a next available device in the group */
215 found = dev_stor_get(type, &more, di);
218 if (specs[type].enum_ended) {
219 debugf("group %d - already enumerated, skipping\n", type);
223 debugf("group%d - first time enum\n", type);
225 if (specs[type].enum_started == 0) {
227 * 2b. If enumerating devices in this group did not
228 * happen before, it means the cookie pointed to a
229 * device from some other group (another storage
230 * group, or network); in this case try to take the
231 * first available device from our group
233 specs[type].enum_started = 1;
236 * Attempt to take the first device in this group:
237 *'first element' flag is set
239 found = dev_stor_get(type, &more, di);
242 errf("group%d - out of order iteration\n", type);
249 * If there are no more devices in this group, consider its
250 * enumeration finished
252 specs[type].enum_ended = (!more) ? 1 : 0;
255 debugf("device found, returning cookie 0x%08x\n",
256 (u_int32_t)di->cookie);
258 debugf("no device found\n");
263 void dev_enum_reset(void)
267 for (i = 0; i < ENUM_MAX; i ++) {
268 specs[i].enum_started = 0;
269 specs[i].enum_ended = 0;
273 int dev_enum_storage(struct device_info *di)
277 /* check: ide, usb, scsi, mmc */
278 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
279 if (dev_enum_stor(i, di))
286 static int dev_stor_is_valid(int type, struct blk_desc *dd)
290 for (i = 0; i < specs[type].max_dev; i++)
291 if (dd == blk_get_dev(specs[type].name, i))
292 if (dd->type != DEV_TYPE_UNKNOWN)
299 int dev_open_stor(void *cookie)
301 int type = dev_stor_type(cookie);
303 if (type == ENUM_MAX)
306 if (dev_stor_is_valid(type, (struct blk_desc *)cookie))
313 int dev_close_stor(void *cookie)
316 * Not much to do as we actually do not alter storage devices upon
323 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
326 struct blk_desc *dd = (struct blk_desc *)cookie;
328 if ((type = dev_stor_type(dd)) == ENUM_MAX)
331 if (!dev_stor_is_valid(type, dd))
335 return blk_dread(dd, start, len, buf);
337 if ((dd->block_read) == NULL) {
338 debugf("no block_read() for device 0x%08x\n", cookie);
342 return dd->block_read(dd, start, len, buf);
343 #endif /* defined(CONFIG_BLK) */