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, "" }, };
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_CMD_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 * first: if 1 the first device in the storage group is returned (if
92 * exists), if 0 the next available device is searched
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 first
, int *more
, struct device_info
*di
)
109 di
->cookie
= (void *)blk_get_dev(specs
[type
].name
, 0);
110 if (di
->cookie
== NULL
)
115 /* provide hint if there are more devices in
116 * this group to enumerate */
117 if (1 < specs
[type
].max_dev
)
121 for (i
= 0; i
< specs
[type
].max_dev
; i
++)
123 (void *)blk_get_dev(specs
[type
].name
, i
)) {
124 /* previous cookie found -- advance to the
125 * next device, if possible */
127 if (++i
>= specs
[type
].max_dev
) {
128 /* out of range, no more to enum */
133 di
->cookie
= (void *)blk_get_dev(
134 specs
[type
].name
, i
);
135 if (di
->cookie
== NULL
)
140 /* provide hint if there are more devices in
141 * this group to enumerate */
142 if ((i
+ 1) < specs
[type
].max_dev
)
150 di
->type
= specs
[type
].type
;
152 if (di
->cookie
!= NULL
) {
153 dd
= (struct blk_desc
*)di
->cookie
;
154 if (dd
->type
== DEV_TYPE_UNKNOWN
) {
155 debugf("device instance exists, but is not active..");
158 di
->di_stor
.block_count
= dd
->lba
;
159 di
->di_stor
.block_size
= dd
->blksz
;
171 * returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc
173 static int dev_stor_type(struct blk_desc
*dd
)
177 for (i
= ENUM_IDE
; i
< ENUM_MAX
; i
++)
178 for (j
= 0; j
< specs
[i
].max_dev
; j
++)
179 if (dd
== blk_get_dev(specs
[i
].name
, j
))
187 * returns: 0/1 whether cookie points to some device in this group
189 static int dev_is_stor(int type
, struct device_info
*di
)
191 return (dev_stor_type(di
->cookie
) == type
) ? 1 : 0;
195 static int dev_enum_stor(int type
, struct device_info
*di
)
197 int found
= 0, more
= 0;
199 debugf("called, type %d\n", type
);
202 * Formulae for enumerating storage devices:
203 * 1. if cookie (hint from previous enum call) is NULL we start again
204 * with enumeration, so return the first available device, done.
206 * 2. if cookie is not NULL, check if it identifies some device in
209 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
210 * return next available (if exists) in this group
212 * 2b. if it isn't device from our group, check if such devices were
213 * ever enumerated before:
214 * - if not, return the first available device from this group
218 if (di
->cookie
== NULL
) {
220 debugf("group%d - enum restart\n", type
);
223 * 1. Enumeration (re-)started: take the first available
226 found
= dev_stor_get(type
, 1, &more
, di
);
227 specs
[type
].enum_started
= 1;
229 } else if (dev_is_stor(type
, di
)) {
231 debugf("group%d - enum continued for the next device\n", type
);
233 if (specs
[type
].enum_ended
) {
234 debugf("group%d - nothing more to enum!\n", type
);
238 /* 2a. Attempt to take a next available device in the group */
239 found
= dev_stor_get(type
, 0, &more
, di
);
243 if (specs
[type
].enum_ended
) {
244 debugf("group %d - already enumerated, skipping\n", type
);
248 debugf("group%d - first time enum\n", type
);
250 if (specs
[type
].enum_started
== 0) {
252 * 2b. If enumerating devices in this group did not
253 * happen before, it means the cookie pointed to a
254 * device frome some other group (another storage
255 * group, or network); in this case try to take the
256 * first available device from our group
258 specs
[type
].enum_started
= 1;
261 * Attempt to take the first device in this group:
262 *'first element' flag is set
264 found
= dev_stor_get(type
, 1, &more
, di
);
267 errf("group%d - out of order iteration\n", type
);
274 * If there are no more devices in this group, consider its
275 * enumeration finished
277 specs
[type
].enum_ended
= (!more
) ? 1 : 0;
280 debugf("device found, returning cookie 0x%08x\n",
281 (u_int32_t
)di
->cookie
);
283 debugf("no device found\n");
288 void dev_enum_reset(void)
292 for (i
= 0; i
< ENUM_MAX
; i
++) {
293 specs
[i
].enum_started
= 0;
294 specs
[i
].enum_ended
= 0;
298 int dev_enum_storage(struct device_info
*di
)
303 * check: ide, usb, scsi, mmc
305 for (i
= ENUM_IDE
; i
< ENUM_MAX
; i
++) {
306 if (dev_enum_stor(i
, di
))
313 static int dev_stor_is_valid(int type
, struct blk_desc
*dd
)
317 for (i
= 0; i
< specs
[type
].max_dev
; i
++)
318 if (dd
== blk_get_dev(specs
[type
].name
, i
))
319 if (dd
->type
!= DEV_TYPE_UNKNOWN
)
326 int dev_open_stor(void *cookie
)
328 int type
= dev_stor_type(cookie
);
330 if (type
== ENUM_MAX
)
333 if (dev_stor_is_valid(type
, (struct blk_desc
*)cookie
))
340 int dev_close_stor(void *cookie
)
343 * Not much to do as we actually do not alter storage devices upon
350 lbasize_t
dev_read_stor(void *cookie
, void *buf
, lbasize_t len
, lbastart_t start
)
353 struct blk_desc
*dd
= (struct blk_desc
*)cookie
;
355 if ((type
= dev_stor_type(dd
)) == ENUM_MAX
)
358 if (!dev_stor_is_valid(type
, dd
))
361 if ((dd
->block_read
) == NULL
) {
362 debugf("no block_read() for device 0x%08x\n", cookie
);
366 return dd
->block_read(dd
, start
, len
, buf
);