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>
12 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
20 #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
22 #define debugf(fmt, args...)
25 #define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)
39 int type; /* "external" type: DT_STOR_{IDE,USB,etc} */
43 static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, NULL }, };
45 #ifndef CONFIG_SYS_MMC_MAX_DEVICE
46 #define CONFIG_SYS_MMC_MAX_DEVICE 1
49 void dev_stor_init(void)
51 #if defined(CONFIG_IDE)
52 specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
53 specs[ENUM_IDE].enum_started = 0;
54 specs[ENUM_IDE].enum_ended = 0;
55 specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
56 specs[ENUM_IDE].name = "ide";
58 #if defined(CONFIG_CMD_MMC)
59 specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
60 specs[ENUM_MMC].enum_started = 0;
61 specs[ENUM_MMC].enum_ended = 0;
62 specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC;
63 specs[ENUM_MMC].name = "mmc";
65 #if defined(CONFIG_SATA)
66 specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
67 specs[ENUM_SATA].enum_started = 0;
68 specs[ENUM_SATA].enum_ended = 0;
69 specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
70 specs[ENUM_SATA].name = "sata";
72 #if defined(CONFIG_SCSI)
73 specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE;
74 specs[ENUM_SCSI].enum_started = 0;
75 specs[ENUM_SCSI].enum_ended = 0;
76 specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
77 specs[ENUM_SCSI].name = "scsi";
79 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
80 specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
81 specs[ENUM_USB].enum_started = 0;
82 specs[ENUM_USB].enum_ended = 0;
83 specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
84 specs[ENUM_USB].name = "usb";
89 * Finds next available device in the storage group
91 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
93 * more: returns 0/1 depending if there are more devices in this group
94 * available (for future iterations)
96 * returns: 0/1 depending if device found in this iteration
98 static int dev_stor_get(int type, int *more, struct device_info *di)
105 /* Wasn't configured for this type, return 0 directly */
106 if (specs[type].name == NULL)
109 if (di->cookie != NULL) {
110 /* Find the last device we've returned */
111 for (i = 0; i < specs[type].max_dev; i++) {
113 (void *)blk_get_dev(specs[type].name, i)) {
124 for (; i < specs[type].max_dev; i++) {
125 di->cookie = (void *)blk_get_dev(specs[type].name, i);
127 if (di->cookie != NULL) {
133 if (i == specs[type].max_dev)
139 di->type = specs[type].type;
141 dd = (struct blk_desc *)di->cookie;
142 if (dd->type == DEV_TYPE_UNKNOWN) {
143 debugf("device instance exists, but is not active..");
146 di->di_stor.block_count = dd->lba;
147 di->di_stor.block_size = dd->blksz;
157 /* returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc */
159 static int dev_stor_type(struct blk_desc *dd)
163 for (i = ENUM_IDE; i < ENUM_MAX; i++)
164 for (j = 0; j < specs[i].max_dev; j++)
165 if (dd == blk_get_dev(specs[i].name, j))
172 /* returns: 0/1 whether cookie points to some device in this group */
174 static int dev_is_stor(int type, struct device_info *di)
176 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
180 static int dev_enum_stor(int type, struct device_info *di)
182 int found = 0, more = 0;
184 debugf("called, type %d\n", type);
187 * Formulae for enumerating storage devices:
188 * 1. if cookie (hint from previous enum call) is NULL we start again
189 * with enumeration, so return the first available device, done.
191 * 2. if cookie is not NULL, check if it identifies some device in
194 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
195 * return next available (if exists) in this group
197 * 2b. if it isn't device from our group, check if such devices were
198 * ever enumerated before:
199 * - if not, return the first available device from this group
203 if (di->cookie == NULL) {
204 debugf("group%d - enum restart\n", type);
207 * 1. Enumeration (re-)started: take the first available
210 found = dev_stor_get(type, &more, di);
211 specs[type].enum_started = 1;
213 } else if (dev_is_stor(type, di)) {
214 debugf("group%d - enum continued for the next device\n", type);
216 if (specs[type].enum_ended) {
217 debugf("group%d - nothing more to enum!\n", type);
221 /* 2a. Attempt to take a next available device in the group */
222 found = dev_stor_get(type, &more, di);
225 if (specs[type].enum_ended) {
226 debugf("group %d - already enumerated, skipping\n", type);
230 debugf("group%d - first time enum\n", type);
232 if (specs[type].enum_started == 0) {
234 * 2b. If enumerating devices in this group did not
235 * happen before, it means the cookie pointed to a
236 * device from some other group (another storage
237 * group, or network); in this case try to take the
238 * first available device from our group
240 specs[type].enum_started = 1;
243 * Attempt to take the first device in this group:
244 *'first element' flag is set
246 found = dev_stor_get(type, &more, di);
249 errf("group%d - out of order iteration\n", type);
256 * If there are no more devices in this group, consider its
257 * enumeration finished
259 specs[type].enum_ended = (!more) ? 1 : 0;
262 debugf("device found, returning cookie 0x%08x\n",
263 (u_int32_t)di->cookie);
265 debugf("no device found\n");
270 void dev_enum_reset(void)
274 for (i = 0; i < ENUM_MAX; i ++) {
275 specs[i].enum_started = 0;
276 specs[i].enum_ended = 0;
280 int dev_enum_storage(struct device_info *di)
284 /* check: ide, usb, scsi, mmc */
285 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
286 if (dev_enum_stor(i, di))
293 static int dev_stor_is_valid(int type, struct blk_desc *dd)
297 for (i = 0; i < specs[type].max_dev; i++)
298 if (dd == blk_get_dev(specs[type].name, i))
299 if (dd->type != DEV_TYPE_UNKNOWN)
306 int dev_open_stor(void *cookie)
308 int type = dev_stor_type(cookie);
310 if (type == ENUM_MAX)
313 if (dev_stor_is_valid(type, (struct blk_desc *)cookie))
320 int dev_close_stor(void *cookie)
323 * Not much to do as we actually do not alter storage devices upon
330 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
333 struct blk_desc *dd = (struct blk_desc *)cookie;
335 if ((type = dev_stor_type(dd)) == ENUM_MAX)
338 if (!dev_stor_is_valid(type, dd))
342 return blk_dread(dd, start, len, buf);
344 if ((dd->block_read) == NULL) {
345 debugf("no block_read() for device 0x%08x\n", cookie);
349 return dd->block_read(dd, start, len, buf);
350 #endif /* defined(CONFIG_BLK) */