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) */