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) */