arm: mvebu: drivers/ddr: remove redundant assignment
[oweals/u-boot.git] / disk / part.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2001
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  */
6
7 #include <common.h>
8 #include <command.h>
9 #include <env.h>
10 #include <errno.h>
11 #include <ide.h>
12 #include <malloc.h>
13 #include <part.h>
14 #include <ubifs_uboot.h>
15
16 #undef  PART_DEBUG
17
18 #ifdef  PART_DEBUG
19 #define PRINTF(fmt,args...)     printf (fmt ,##args)
20 #else
21 #define PRINTF(fmt,args...)
22 #endif
23
24 /* Check all partition types */
25 #define PART_TYPE_ALL           -1
26
27 static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
28 {
29         struct part_driver *drv =
30                 ll_entry_start(struct part_driver, part_driver);
31         const int n_ents = ll_entry_count(struct part_driver, part_driver);
32         struct part_driver *entry;
33
34         if (dev_desc->part_type == PART_TYPE_UNKNOWN) {
35                 for (entry = drv; entry != drv + n_ents; entry++) {
36                         int ret;
37
38                         ret = entry->test(dev_desc);
39                         if (!ret) {
40                                 dev_desc->part_type = entry->part_type;
41                                 return entry;
42                         }
43                 }
44         } else {
45                 for (entry = drv; entry != drv + n_ents; entry++) {
46                         if (dev_desc->part_type == entry->part_type)
47                                 return entry;
48                 }
49         }
50
51         /* Not found */
52         return NULL;
53 }
54
55 #ifdef CONFIG_HAVE_BLOCK_DEVICE
56 static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
57 {
58         struct blk_desc *dev_desc;
59         int ret;
60
61         dev_desc = blk_get_devnum_by_typename(ifname, dev);
62         if (!dev_desc) {
63                 debug("%s: No device for iface '%s', dev %d\n", __func__,
64                       ifname, dev);
65                 return NULL;
66         }
67         ret = blk_dselect_hwpart(dev_desc, hwpart);
68         if (ret) {
69                 debug("%s: Failed to select h/w partition: err-%d\n", __func__,
70                       ret);
71                 return NULL;
72         }
73
74         return dev_desc;
75 }
76
77 struct blk_desc *blk_get_dev(const char *ifname, int dev)
78 {
79         return get_dev_hwpart(ifname, dev, 0);
80 }
81 #else
82 struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
83 {
84         return NULL;
85 }
86
87 struct blk_desc *blk_get_dev(const char *ifname, int dev)
88 {
89         return NULL;
90 }
91 #endif
92
93 #ifdef CONFIG_HAVE_BLOCK_DEVICE
94
95 /* ------------------------------------------------------------------------- */
96 /*
97  * reports device info to the user
98  */
99
100 #ifdef CONFIG_LBA48
101 typedef uint64_t lba512_t;
102 #else
103 typedef lbaint_t lba512_t;
104 #endif
105
106 /*
107  * Overflowless variant of (block_count * mul_by / 2**right_shift)
108  * when 2**right_shift > mul_by
109  */
110 static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by,
111                               int right_shift)
112 {
113         lba512_t bc_quot, bc_rem;
114
115         /* x * m / d == x / d * m + (x % d) * m / d */
116         bc_quot = block_count >> right_shift;
117         bc_rem  = block_count - (bc_quot << right_shift);
118         return bc_quot * mul_by + ((bc_rem * mul_by) >> right_shift);
119 }
120
121 void dev_print (struct blk_desc *dev_desc)
122 {
123         lba512_t lba512; /* number of blocks if 512bytes block size */
124
125         if (dev_desc->type == DEV_TYPE_UNKNOWN) {
126                 puts ("not available\n");
127                 return;
128         }
129
130         switch (dev_desc->if_type) {
131         case IF_TYPE_SCSI:
132                 printf ("(%d:%d) Vendor: %s Prod.: %s Rev: %s\n",
133                         dev_desc->target,dev_desc->lun,
134                         dev_desc->vendor,
135                         dev_desc->product,
136                         dev_desc->revision);
137                 break;
138         case IF_TYPE_ATAPI:
139         case IF_TYPE_IDE:
140         case IF_TYPE_SATA:
141                 printf ("Model: %s Firm: %s Ser#: %s\n",
142                         dev_desc->vendor,
143                         dev_desc->revision,
144                         dev_desc->product);
145                 break;
146         case IF_TYPE_SD:
147         case IF_TYPE_MMC:
148         case IF_TYPE_USB:
149         case IF_TYPE_NVME:
150                 printf ("Vendor: %s Rev: %s Prod: %s\n",
151                         dev_desc->vendor,
152                         dev_desc->revision,
153                         dev_desc->product);
154                 break;
155         case IF_TYPE_VIRTIO:
156                 printf("%s VirtIO Block Device\n", dev_desc->vendor);
157                 break;
158         case IF_TYPE_DOC:
159                 puts("device type DOC\n");
160                 return;
161         case IF_TYPE_UNKNOWN:
162                 puts("device type unknown\n");
163                 return;
164         default:
165                 printf("Unhandled device type: %i\n", dev_desc->if_type);
166                 return;
167         }
168         puts ("            Type: ");
169         if (dev_desc->removable)
170                 puts ("Removable ");
171         switch (dev_desc->type & 0x1F) {
172         case DEV_TYPE_HARDDISK:
173                 puts ("Hard Disk");
174                 break;
175         case DEV_TYPE_CDROM:
176                 puts ("CD ROM");
177                 break;
178         case DEV_TYPE_OPDISK:
179                 puts ("Optical Device");
180                 break;
181         case DEV_TYPE_TAPE:
182                 puts ("Tape");
183                 break;
184         default:
185                 printf ("# %02X #", dev_desc->type & 0x1F);
186                 break;
187         }
188         puts ("\n");
189         if (dev_desc->lba > 0L && dev_desc->blksz > 0L) {
190                 ulong mb, mb_quot, mb_rem, gb, gb_quot, gb_rem;
191                 lbaint_t lba;
192
193                 lba = dev_desc->lba;
194
195                 lba512 = (lba * (dev_desc->blksz/512));
196                 /* round to 1 digit */
197                 /* 2048 = (1024 * 1024) / 512 MB */
198                 mb = lba512_muldiv(lba512, 10, 11);
199
200                 mb_quot = mb / 10;
201                 mb_rem  = mb - (10 * mb_quot);
202
203                 gb = mb / 1024;
204                 gb_quot = gb / 10;
205                 gb_rem  = gb - (10 * gb_quot);
206 #ifdef CONFIG_LBA48
207                 if (dev_desc->lba48)
208                         printf ("            Supports 48-bit addressing\n");
209 #endif
210 #if defined(CONFIG_SYS_64BIT_LBA)
211                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%llu x %lu)\n",
212                         mb_quot, mb_rem,
213                         gb_quot, gb_rem,
214                         lba,
215                         dev_desc->blksz);
216 #else
217                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%lu x %lu)\n",
218                         mb_quot, mb_rem,
219                         gb_quot, gb_rem,
220                         (ulong)lba,
221                         dev_desc->blksz);
222 #endif
223         } else {
224                 puts ("            Capacity: not available\n");
225         }
226 }
227 #endif
228
229 #ifdef CONFIG_HAVE_BLOCK_DEVICE
230
231 void part_init(struct blk_desc *dev_desc)
232 {
233         struct part_driver *drv =
234                 ll_entry_start(struct part_driver, part_driver);
235         const int n_ents = ll_entry_count(struct part_driver, part_driver);
236         struct part_driver *entry;
237
238         blkcache_invalidate(dev_desc->if_type, dev_desc->devnum);
239
240         dev_desc->part_type = PART_TYPE_UNKNOWN;
241         for (entry = drv; entry != drv + n_ents; entry++) {
242                 int ret;
243
244                 ret = entry->test(dev_desc);
245                 debug("%s: try '%s': ret=%d\n", __func__, entry->name, ret);
246                 if (!ret) {
247                         dev_desc->part_type = entry->part_type;
248                         break;
249                 }
250         }
251 }
252
253 static void print_part_header(const char *type, struct blk_desc *dev_desc)
254 {
255 #if CONFIG_IS_ENABLED(MAC_PARTITION) || \
256         CONFIG_IS_ENABLED(DOS_PARTITION) || \
257         CONFIG_IS_ENABLED(ISO_PARTITION) || \
258         CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
259         CONFIG_IS_ENABLED(EFI_PARTITION)
260         puts ("\nPartition Map for ");
261         switch (dev_desc->if_type) {
262         case IF_TYPE_IDE:
263                 puts ("IDE");
264                 break;
265         case IF_TYPE_SATA:
266                 puts ("SATA");
267                 break;
268         case IF_TYPE_SCSI:
269                 puts ("SCSI");
270                 break;
271         case IF_TYPE_ATAPI:
272                 puts ("ATAPI");
273                 break;
274         case IF_TYPE_USB:
275                 puts ("USB");
276                 break;
277         case IF_TYPE_DOC:
278                 puts ("DOC");
279                 break;
280         case IF_TYPE_MMC:
281                 puts ("MMC");
282                 break;
283         case IF_TYPE_HOST:
284                 puts ("HOST");
285                 break;
286         case IF_TYPE_NVME:
287                 puts ("NVMe");
288                 break;
289         case IF_TYPE_VIRTIO:
290                 puts("VirtIO");
291                 break;
292         default:
293                 puts ("UNKNOWN");
294                 break;
295         }
296         printf (" device %d  --   Partition Type: %s\n\n",
297                         dev_desc->devnum, type);
298 #endif /* any CONFIG_..._PARTITION */
299 }
300
301 void part_print(struct blk_desc *dev_desc)
302 {
303         struct part_driver *drv;
304
305         drv = part_driver_lookup_type(dev_desc);
306         if (!drv) {
307                 printf("## Unknown partition table type %x\n",
308                        dev_desc->part_type);
309                 return;
310         }
311
312         PRINTF("## Testing for valid %s partition ##\n", drv->name);
313         print_part_header(drv->name, dev_desc);
314         if (drv->print)
315                 drv->print(dev_desc);
316 }
317
318 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
319
320 int part_get_info(struct blk_desc *dev_desc, int part,
321                        disk_partition_t *info)
322 {
323 #ifdef CONFIG_HAVE_BLOCK_DEVICE
324         struct part_driver *drv;
325
326 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
327         /* The common case is no UUID support */
328         info->uuid[0] = 0;
329 #endif
330 #ifdef CONFIG_PARTITION_TYPE_GUID
331         info->type_guid[0] = 0;
332 #endif
333
334         drv = part_driver_lookup_type(dev_desc);
335         if (!drv) {
336                 debug("## Unknown partition table type %x\n",
337                       dev_desc->part_type);
338                 return -EPROTONOSUPPORT;
339         }
340         if (!drv->get_info) {
341                 PRINTF("## Driver %s does not have the get_info() method\n",
342                        drv->name);
343                 return -ENOSYS;
344         }
345         if (drv->get_info(dev_desc, part, info) == 0) {
346                 PRINTF("## Valid %s partition found ##\n", drv->name);
347                 return 0;
348         }
349 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
350
351         return -1;
352 }
353
354 int part_get_info_whole_disk(struct blk_desc *dev_desc, disk_partition_t *info)
355 {
356         info->start = 0;
357         info->size = dev_desc->lba;
358         info->blksz = dev_desc->blksz;
359         info->bootable = 0;
360         strcpy((char *)info->type, BOOT_PART_TYPE);
361         strcpy((char *)info->name, "Whole Disk");
362 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
363         info->uuid[0] = 0;
364 #endif
365 #ifdef CONFIG_PARTITION_TYPE_GUID
366         info->type_guid[0] = 0;
367 #endif
368
369         return 0;
370 }
371
372 int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str,
373                           struct blk_desc **dev_desc)
374 {
375         char *ep;
376         char *dup_str = NULL;
377         const char *dev_str, *hwpart_str;
378         int dev, hwpart;
379
380         hwpart_str = strchr(dev_hwpart_str, '.');
381         if (hwpart_str) {
382                 dup_str = strdup(dev_hwpart_str);
383                 dup_str[hwpart_str - dev_hwpart_str] = 0;
384                 dev_str = dup_str;
385                 hwpart_str++;
386         } else {
387                 dev_str = dev_hwpart_str;
388                 hwpart = 0;
389         }
390
391         dev = simple_strtoul(dev_str, &ep, 16);
392         if (*ep) {
393                 printf("** Bad device specification %s %s **\n",
394                        ifname, dev_str);
395                 dev = -EINVAL;
396                 goto cleanup;
397         }
398
399         if (hwpart_str) {
400                 hwpart = simple_strtoul(hwpart_str, &ep, 16);
401                 if (*ep) {
402                         printf("** Bad HW partition specification %s %s **\n",
403                             ifname, hwpart_str);
404                         dev = -EINVAL;
405                         goto cleanup;
406                 }
407         }
408
409         *dev_desc = get_dev_hwpart(ifname, dev, hwpart);
410         if (!(*dev_desc) || ((*dev_desc)->type == DEV_TYPE_UNKNOWN)) {
411                 debug("** Bad device %s %s **\n", ifname, dev_hwpart_str);
412                 dev = -ENOENT;
413                 goto cleanup;
414         }
415
416 #ifdef CONFIG_HAVE_BLOCK_DEVICE
417         /*
418          * Updates the partition table for the specified hw partition.
419          * Always should be done, otherwise hw partition 0 will return stale
420          * data after displaying a non-zero hw partition.
421          */
422         part_init(*dev_desc);
423 #endif
424
425 cleanup:
426         free(dup_str);
427         return dev;
428 }
429
430 #define PART_UNSPECIFIED -2
431 #define PART_AUTO -1
432 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
433                              struct blk_desc **dev_desc,
434                              disk_partition_t *info, int allow_whole_dev)
435 {
436         int ret = -1;
437         const char *part_str;
438         char *dup_str = NULL;
439         const char *dev_str;
440         int dev;
441         char *ep;
442         int p;
443         int part;
444         disk_partition_t tmpinfo;
445
446 #ifdef CONFIG_SANDBOX
447         /*
448          * Special-case a pseudo block device "hostfs", to allow access to the
449          * host's own filesystem.
450          */
451         if (0 == strcmp(ifname, "hostfs")) {
452                 *dev_desc = NULL;
453                 info->start = 0;
454                 info->size = 0;
455                 info->blksz = 0;
456                 info->bootable = 0;
457                 strcpy((char *)info->type, BOOT_PART_TYPE);
458                 strcpy((char *)info->name, "Sandbox host");
459 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
460                 info->uuid[0] = 0;
461 #endif
462 #ifdef CONFIG_PARTITION_TYPE_GUID
463                 info->type_guid[0] = 0;
464 #endif
465
466                 return 0;
467         }
468 #endif
469
470 #ifdef CONFIG_CMD_UBIFS
471         /*
472          * Special-case ubi, ubi goes through a mtd, rather than through
473          * a regular block device.
474          */
475         if (0 == strcmp(ifname, "ubi")) {
476                 if (!ubifs_is_mounted()) {
477                         printf("UBIFS not mounted, use ubifsmount to mount volume first!\n");
478                         return -1;
479                 }
480
481                 *dev_desc = NULL;
482                 memset(info, 0, sizeof(*info));
483                 strcpy((char *)info->type, BOOT_PART_TYPE);
484                 strcpy((char *)info->name, "UBI");
485 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
486                 info->uuid[0] = 0;
487 #endif
488                 return 0;
489         }
490 #endif
491
492         /* If no dev_part_str, use bootdevice environment variable */
493         if (!dev_part_str || !strlen(dev_part_str) ||
494             !strcmp(dev_part_str, "-"))
495                 dev_part_str = env_get("bootdevice");
496
497         /* If still no dev_part_str, it's an error */
498         if (!dev_part_str) {
499                 printf("** No device specified **\n");
500                 goto cleanup;
501         }
502
503         /* Separate device and partition ID specification */
504         part_str = strchr(dev_part_str, ':');
505         if (part_str) {
506                 dup_str = strdup(dev_part_str);
507                 dup_str[part_str - dev_part_str] = 0;
508                 dev_str = dup_str;
509                 part_str++;
510         } else {
511                 dev_str = dev_part_str;
512         }
513
514         /* Look up the device */
515         dev = blk_get_device_by_str(ifname, dev_str, dev_desc);
516         if (dev < 0)
517                 goto cleanup;
518
519         /* Convert partition ID string to number */
520         if (!part_str || !*part_str) {
521                 part = PART_UNSPECIFIED;
522         } else if (!strcmp(part_str, "auto")) {
523                 part = PART_AUTO;
524         } else {
525                 /* Something specified -> use exactly that */
526                 part = (int)simple_strtoul(part_str, &ep, 16);
527                 /*
528                  * Less than whole string converted,
529                  * or request for whole device, but caller requires partition.
530                  */
531                 if (*ep || (part == 0 && !allow_whole_dev)) {
532                         printf("** Bad partition specification %s %s **\n",
533                             ifname, dev_part_str);
534                         goto cleanup;
535                 }
536         }
537
538         /*
539          * No partition table on device,
540          * or user requested partition 0 (entire device).
541          */
542         if (((*dev_desc)->part_type == PART_TYPE_UNKNOWN) ||
543             (part == 0)) {
544                 if (!(*dev_desc)->lba) {
545                         printf("** Bad device size - %s %s **\n", ifname,
546                                dev_str);
547                         goto cleanup;
548                 }
549
550                 /*
551                  * If user specified a partition ID other than 0,
552                  * or the calling command only accepts partitions,
553                  * it's an error.
554                  */
555                 if ((part > 0) || (!allow_whole_dev)) {
556                         printf("** No partition table - %s %s **\n", ifname,
557                                dev_str);
558                         goto cleanup;
559                 }
560
561                 (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
562
563                 part_get_info_whole_disk(*dev_desc, info);
564
565                 ret = 0;
566                 goto cleanup;
567         }
568
569         /*
570          * Now there's known to be a partition table,
571          * not specifying a partition means to pick partition 1.
572          */
573         if (part == PART_UNSPECIFIED)
574                 part = 1;
575
576         /*
577          * If user didn't specify a partition number, or did specify something
578          * other than "auto", use that partition number directly.
579          */
580         if (part != PART_AUTO) {
581                 ret = part_get_info(*dev_desc, part, info);
582                 if (ret) {
583                         printf("** Invalid partition %d **\n", part);
584                         goto cleanup;
585                 }
586         } else {
587                 /*
588                  * Find the first bootable partition.
589                  * If none are bootable, fall back to the first valid partition.
590                  */
591                 part = 0;
592                 for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
593                         ret = part_get_info(*dev_desc, p, info);
594                         if (ret)
595                                 continue;
596
597                         /*
598                          * First valid partition, or new better partition?
599                          * If so, save partition ID.
600                          */
601                         if (!part || info->bootable)
602                                 part = p;
603
604                         /* Best possible partition? Stop searching. */
605                         if (info->bootable)
606                                 break;
607
608                         /*
609                          * We now need to search further for best possible.
610                          * If we what we just queried was the best so far,
611                          * save the info since we over-write it next loop.
612                          */
613                         if (part == p)
614                                 tmpinfo = *info;
615                 }
616                 /* If we found any acceptable partition */
617                 if (part) {
618                         /*
619                          * If we searched all possible partition IDs,
620                          * return the first valid partition we found.
621                          */
622                         if (p == MAX_SEARCH_PARTITIONS + 1)
623                                 *info = tmpinfo;
624                 } else {
625                         printf("** No valid partitions found **\n");
626                         ret = -1;
627                         goto cleanup;
628                 }
629         }
630         if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
631                 printf("** Invalid partition type \"%.32s\""
632                         " (expect \"" BOOT_PART_TYPE "\")\n",
633                         info->type);
634                 ret  = -1;
635                 goto cleanup;
636         }
637
638         (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
639
640         ret = part;
641         goto cleanup;
642
643 cleanup:
644         free(dup_str);
645         return ret;
646 }
647
648 int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
649                                disk_partition_t *info, int part_type)
650 {
651         struct part_driver *part_drv;
652         int ret;
653         int i;
654
655         part_drv = part_driver_lookup_type(dev_desc);
656         if (!part_drv)
657                 return -1;
658         for (i = 1; i < part_drv->max_entries; i++) {
659                 ret = part_drv->get_info(dev_desc, i, info);
660                 if (ret != 0) {
661                         /* no more entries in table */
662                         break;
663                 }
664                 if (strcmp(name, (const char *)info->name) == 0) {
665                         /* matched */
666                         return i;
667                 }
668         }
669
670         return -1;
671 }
672
673 int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
674                           disk_partition_t *info)
675 {
676         return part_get_info_by_name_type(dev_desc, name, info, PART_TYPE_ALL);
677 }
678
679 /**
680  * Get partition info from device number and partition name.
681  *
682  * Parse a device number and partition name string in the form of
683  * "device_num#partition_name", for example "0#misc". If the partition
684  * is found, sets dev_desc and part_info accordingly with the information
685  * of the partition with the given partition_name.
686  *
687  * @param[in] dev_iface Device interface
688  * @param[in] dev_part_str Input string argument, like "0#misc"
689  * @param[out] dev_desc Place to store the device description pointer
690  * @param[out] part_info Place to store the partition information
691  * @return 0 on success, or a negative on error
692  */
693 static int part_get_info_by_dev_and_name(const char *dev_iface,
694                                          const char *dev_part_str,
695                                          struct blk_desc **dev_desc,
696                                          disk_partition_t *part_info)
697 {
698         char *ep;
699         const char *part_str;
700         int dev_num;
701
702         part_str = strchr(dev_part_str, '#');
703         if (!part_str || part_str == dev_part_str)
704                 return -EINVAL;
705
706         dev_num = simple_strtoul(dev_part_str, &ep, 16);
707         if (ep != part_str) {
708                 /* Not all the first part before the # was parsed. */
709                 return -EINVAL;
710         }
711         part_str++;
712
713         *dev_desc = blk_get_dev(dev_iface, dev_num);
714         if (!*dev_desc) {
715                 printf("Could not find %s %d\n", dev_iface, dev_num);
716                 return -EINVAL;
717         }
718         if (part_get_info_by_name(*dev_desc, part_str, part_info) < 0) {
719                 printf("Could not find \"%s\" partition\n", part_str);
720                 return -EINVAL;
721         }
722         return 0;
723 }
724
725 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
726                                          const char *dev_part_str,
727                                          struct blk_desc **dev_desc,
728                                          disk_partition_t *part_info)
729 {
730         /* Split the part_name if passed as "$dev_num#part_name". */
731         if (!part_get_info_by_dev_and_name(dev_iface, dev_part_str,
732                                            dev_desc, part_info))
733                 return 0;
734         /*
735          * Couldn't lookup by name, try looking up the partition description
736          * directly.
737          */
738         if (blk_get_device_part_str(dev_iface, dev_part_str,
739                                     dev_desc, part_info, 1) < 0) {
740                 printf("Couldn't find partition %s %s\n",
741                        dev_iface, dev_part_str);
742                 return -EINVAL;
743         }
744         return 0;
745 }
746
747 void part_set_generic_name(const struct blk_desc *dev_desc,
748         int part_num, char *name)
749 {
750         char *devtype;
751
752         switch (dev_desc->if_type) {
753         case IF_TYPE_IDE:
754         case IF_TYPE_SATA:
755         case IF_TYPE_ATAPI:
756                 devtype = "hd";
757                 break;
758         case IF_TYPE_SCSI:
759                 devtype = "sd";
760                 break;
761         case IF_TYPE_USB:
762                 devtype = "usbd";
763                 break;
764         case IF_TYPE_DOC:
765                 devtype = "docd";
766                 break;
767         case IF_TYPE_MMC:
768         case IF_TYPE_SD:
769                 devtype = "mmcsd";
770                 break;
771         default:
772                 devtype = "xx";
773                 break;
774         }
775
776         sprintf(name, "%s%c%d", devtype, 'a' + dev_desc->devnum, part_num);
777 }