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 }, };
46 #ifndef CONFIG_SYS_MMC_MAX_DEVICE
47 #define CONFIG_SYS_MMC_MAX_DEVICE 1
50 void dev_stor_init(void)
52 #if defined(CONFIG_IDE)
53 specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE;
54 specs[ENUM_IDE].enum_started = 0;
55 specs[ENUM_IDE].enum_ended = 0;
56 specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE;
57 specs[ENUM_IDE].name = "ide";
59 #if defined(CONFIG_CMD_MMC)
60 specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE;
61 specs[ENUM_MMC].enum_started = 0;
62 specs[ENUM_MMC].enum_ended = 0;
63 specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC;
64 specs[ENUM_MMC].name = "mmc";
66 #if defined(CONFIG_SATA)
67 specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE;
68 specs[ENUM_SATA].enum_started = 0;
69 specs[ENUM_SATA].enum_ended = 0;
70 specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
71 specs[ENUM_SATA].name = "sata";
73 #if defined(CONFIG_SCSI)
74 specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE;
75 specs[ENUM_SCSI].enum_started = 0;
76 specs[ENUM_SCSI].enum_ended = 0;
77 specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
78 specs[ENUM_SCSI].name = "scsi";
80 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
81 specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
82 specs[ENUM_USB].enum_started = 0;
83 specs[ENUM_USB].enum_ended = 0;
84 specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB;
85 specs[ENUM_USB].name = "usb";
90 * Finds next available device in the storage group
92 * type: storage group type - ENUM_IDE, ENUM_SCSI etc.
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 *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)) {
120 for (; i < specs[type].max_dev; i++) {
121 di->cookie = (void *)blk_get_dev(specs[type].name, i);
123 if (di->cookie != NULL) {
129 if (i == specs[type].max_dev)
135 di->type = specs[type].type;
137 dd = (struct blk_desc *)di->cookie;
138 if (dd->type == DEV_TYPE_UNKNOWN) {
139 debugf("device instance exists, but is not active..");
142 di->di_stor.block_count = dd->lba;
143 di->di_stor.block_size = dd->blksz;
153 /* returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc */
155 static int dev_stor_type(struct blk_desc *dd)
159 for (i = ENUM_IDE; i < ENUM_MAX; i++)
160 for (j = 0; j < specs[i].max_dev; j++)
161 if (dd == blk_get_dev(specs[i].name, j))
168 /* returns: 0/1 whether cookie points to some device in this group */
170 static int dev_is_stor(int type, struct device_info *di)
172 return (dev_stor_type(di->cookie) == type) ? 1 : 0;
176 static int dev_enum_stor(int type, struct device_info *di)
178 int found = 0, more = 0;
180 debugf("called, type %d\n", type);
183 * Formulae for enumerating storage devices:
184 * 1. if cookie (hint from previous enum call) is NULL we start again
185 * with enumeration, so return the first available device, done.
187 * 2. if cookie is not NULL, check if it identifies some device in
190 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
191 * return next available (if exists) in this group
193 * 2b. if it isn't device from our group, check if such devices were
194 * ever enumerated before:
195 * - if not, return the first available device from this group
199 if (di->cookie == NULL) {
200 debugf("group%d - enum restart\n", type);
203 * 1. Enumeration (re-)started: take the first available
206 found = dev_stor_get(type, &more, di);
207 specs[type].enum_started = 1;
209 } else if (dev_is_stor(type, di)) {
210 debugf("group%d - enum continued for the next device\n", type);
212 if (specs[type].enum_ended) {
213 debugf("group%d - nothing more to enum!\n", type);
217 /* 2a. Attempt to take a next available device in the group */
218 found = dev_stor_get(type, &more, di);
221 if (specs[type].enum_ended) {
222 debugf("group %d - already enumerated, skipping\n", type);
226 debugf("group%d - first time enum\n", type);
228 if (specs[type].enum_started == 0) {
230 * 2b. If enumerating devices in this group did not
231 * happen before, it means the cookie pointed to a
232 * device from some other group (another storage
233 * group, or network); in this case try to take the
234 * first available device from our group
236 specs[type].enum_started = 1;
239 * Attempt to take the first device in this group:
240 *'first element' flag is set
242 found = dev_stor_get(type, &more, di);
245 errf("group%d - out of order iteration\n", type);
252 * If there are no more devices in this group, consider its
253 * enumeration finished
255 specs[type].enum_ended = (!more) ? 1 : 0;
258 debugf("device found, returning cookie 0x%08x\n",
259 (u_int32_t)di->cookie);
261 debugf("no device found\n");
266 void dev_enum_reset(void)
270 for (i = 0; i < ENUM_MAX; i ++) {
271 specs[i].enum_started = 0;
272 specs[i].enum_ended = 0;
276 int dev_enum_storage(struct device_info *di)
280 /* check: ide, usb, scsi, mmc */
281 for (i = ENUM_IDE; i < ENUM_MAX; i ++) {
282 if (dev_enum_stor(i, di))
289 static int dev_stor_is_valid(int type, struct blk_desc *dd)
293 for (i = 0; i < specs[type].max_dev; i++)
294 if (dd == blk_get_dev(specs[type].name, i))
295 if (dd->type != DEV_TYPE_UNKNOWN)
302 int dev_open_stor(void *cookie)
304 int type = dev_stor_type(cookie);
306 if (type == ENUM_MAX)
309 if (dev_stor_is_valid(type, (struct blk_desc *)cookie))
316 int dev_close_stor(void *cookie)
319 * Not much to do as we actually do not alter storage devices upon
326 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
329 struct blk_desc *dd = (struct blk_desc *)cookie;
331 if ((type = dev_stor_type(dd)) == ENUM_MAX)
334 if (!dev_stor_is_valid(type, dd))
338 return blk_dread(dd, start, len, buf);
340 if ((dd->block_read) == NULL) {
341 debugf("no block_read() for device 0x%08x\n", cookie);
345 return dd->block_read(dd, start, len, buf);
346 #endif /* defined(CONFIG_BLK) */