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 * 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
)
108 /* Wasn't configured for this type, return 0 directly */
109 if (specs
[type
].name
== NULL
)
113 di
->cookie
= (void *)blk_get_dev(specs
[type
].name
, 0);
114 if (di
->cookie
== NULL
)
119 /* provide hint if there are more devices in
120 * this group to enumerate */
121 if (1 < specs
[type
].max_dev
)
125 for (i
= 0; i
< specs
[type
].max_dev
; i
++)
127 (void *)blk_get_dev(specs
[type
].name
, i
)) {
128 /* previous cookie found -- advance to the
129 * next device, if possible */
131 if (++i
>= specs
[type
].max_dev
) {
132 /* out of range, no more to enum */
137 di
->cookie
= (void *)blk_get_dev(
138 specs
[type
].name
, i
);
139 if (di
->cookie
== NULL
)
144 /* provide hint if there are more devices in
145 * this group to enumerate */
146 if ((i
+ 1) < specs
[type
].max_dev
)
154 di
->type
= specs
[type
].type
;
156 if (di
->cookie
!= NULL
) {
157 dd
= (struct blk_desc
*)di
->cookie
;
158 if (dd
->type
== DEV_TYPE_UNKNOWN
) {
159 debugf("device instance exists, but is not active..");
162 di
->di_stor
.block_count
= dd
->lba
;
163 di
->di_stor
.block_size
= dd
->blksz
;
175 * returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc
177 static int dev_stor_type(struct blk_desc
*dd
)
181 for (i
= ENUM_IDE
; i
< ENUM_MAX
; i
++)
182 for (j
= 0; j
< specs
[i
].max_dev
; j
++)
183 if (dd
== blk_get_dev(specs
[i
].name
, j
))
191 * returns: 0/1 whether cookie points to some device in this group
193 static int dev_is_stor(int type
, struct device_info
*di
)
195 return (dev_stor_type(di
->cookie
) == type
) ? 1 : 0;
199 static int dev_enum_stor(int type
, struct device_info
*di
)
201 int found
= 0, more
= 0;
203 debugf("called, type %d\n", type
);
206 * Formulae for enumerating storage devices:
207 * 1. if cookie (hint from previous enum call) is NULL we start again
208 * with enumeration, so return the first available device, done.
210 * 2. if cookie is not NULL, check if it identifies some device in
213 * 2a. if cookie is a storage device from our group (IDE, USB etc.),
214 * return next available (if exists) in this group
216 * 2b. if it isn't device from our group, check if such devices were
217 * ever enumerated before:
218 * - if not, return the first available device from this group
222 if (di
->cookie
== NULL
) {
224 debugf("group%d - enum restart\n", type
);
227 * 1. Enumeration (re-)started: take the first available
230 found
= dev_stor_get(type
, 1, &more
, di
);
231 specs
[type
].enum_started
= 1;
233 } else if (dev_is_stor(type
, di
)) {
235 debugf("group%d - enum continued for the next device\n", type
);
237 if (specs
[type
].enum_ended
) {
238 debugf("group%d - nothing more to enum!\n", type
);
242 /* 2a. Attempt to take a next available device in the group */
243 found
= dev_stor_get(type
, 0, &more
, di
);
247 if (specs
[type
].enum_ended
) {
248 debugf("group %d - already enumerated, skipping\n", type
);
252 debugf("group%d - first time enum\n", type
);
254 if (specs
[type
].enum_started
== 0) {
256 * 2b. If enumerating devices in this group did not
257 * happen before, it means the cookie pointed to a
258 * device frome some other group (another storage
259 * group, or network); in this case try to take the
260 * first available device from our group
262 specs
[type
].enum_started
= 1;
265 * Attempt to take the first device in this group:
266 *'first element' flag is set
268 found
= dev_stor_get(type
, 1, &more
, di
);
271 errf("group%d - out of order iteration\n", type
);
278 * If there are no more devices in this group, consider its
279 * enumeration finished
281 specs
[type
].enum_ended
= (!more
) ? 1 : 0;
284 debugf("device found, returning cookie 0x%08x\n",
285 (u_int32_t
)di
->cookie
);
287 debugf("no device found\n");
292 void dev_enum_reset(void)
296 for (i
= 0; i
< ENUM_MAX
; i
++) {
297 specs
[i
].enum_started
= 0;
298 specs
[i
].enum_ended
= 0;
302 int dev_enum_storage(struct device_info
*di
)
307 * check: ide, usb, scsi, mmc
309 for (i
= ENUM_IDE
; i
< ENUM_MAX
; i
++) {
310 if (dev_enum_stor(i
, di
))
317 static int dev_stor_is_valid(int type
, struct blk_desc
*dd
)
321 for (i
= 0; i
< specs
[type
].max_dev
; i
++)
322 if (dd
== blk_get_dev(specs
[type
].name
, i
))
323 if (dd
->type
!= DEV_TYPE_UNKNOWN
)
330 int dev_open_stor(void *cookie
)
332 int type
= dev_stor_type(cookie
);
334 if (type
== ENUM_MAX
)
337 if (dev_stor_is_valid(type
, (struct blk_desc
*)cookie
))
344 int dev_close_stor(void *cookie
)
347 * Not much to do as we actually do not alter storage devices upon
354 lbasize_t
dev_read_stor(void *cookie
, void *buf
, lbasize_t len
, lbastart_t start
)
357 struct blk_desc
*dd
= (struct blk_desc
*)cookie
;
359 if ((type
= dev_stor_type(dd
)) == ENUM_MAX
)
362 if (!dev_stor_is_valid(type
, dd
))
365 if ((dd
->block_read
) == NULL
) {
366 debugf("no block_read() for device 0x%08x\n", cookie
);
370 return dd
->block_read(dd
, start
, len
, buf
);