Merge branch 'master' of git://git.denx.de/u-boot-usb
[platform/kernel/u-boot.git] / drivers / fastboot / fb_mmc.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright 2014 Broadcom Corporation.
4  */
5
6 #include <config.h>
7 #include <common.h>
8 #include <blk.h>
9 #include <env.h>
10 #include <fastboot.h>
11 #include <fastboot-internal.h>
12 #include <fb_mmc.h>
13 #include <flash.h>
14 #include <image-sparse.h>
15 #include <image.h>
16 #include <log.h>
17 #include <part.h>
18 #include <mmc.h>
19 #include <div64.h>
20 #include <linux/compat.h>
21 #include <android_image.h>
22
23 #define FASTBOOT_MAX_BLK_WRITE 16384
24
25 #define BOOT_PARTITION_NAME "boot"
26
27 struct fb_mmc_sparse {
28         struct blk_desc *dev_desc;
29 };
30
31 static int part_get_info_by_name_or_alias(struct blk_desc *dev_desc,
32                 const char *name, struct disk_partition *info)
33 {
34         int ret;
35
36         ret = part_get_info_by_name(dev_desc, name, info);
37         if (ret < 0) {
38                 /* strlen("fastboot_partition_alias_") + PART_NAME_LEN + 1 */
39                 char env_alias_name[25 + PART_NAME_LEN + 1];
40                 char *aliased_part_name;
41
42                 /* check for alias */
43                 strcpy(env_alias_name, "fastboot_partition_alias_");
44                 strncat(env_alias_name, name, PART_NAME_LEN);
45                 aliased_part_name = env_get(env_alias_name);
46                 if (aliased_part_name != NULL)
47                         ret = part_get_info_by_name(dev_desc,
48                                         aliased_part_name, info);
49         }
50         return ret;
51 }
52
53 static int raw_part_get_info_by_name(struct blk_desc *dev_desc,
54                 const char *name, struct disk_partition *info, int *mmcpart)
55 {
56         /* strlen("fastboot_raw_partition_") + PART_NAME_LEN + 1 */
57         char env_desc_name[23 + PART_NAME_LEN + 1];
58         char *raw_part_desc;
59         const char *argv[2];
60         const char **parg = argv;
61
62         /* check for raw partition descriptor */
63         strcpy(env_desc_name, "fastboot_raw_partition_");
64         strncat(env_desc_name, name, PART_NAME_LEN);
65         raw_part_desc = strdup(env_get(env_desc_name));
66         if (raw_part_desc == NULL)
67                 return -ENODEV;
68
69         /*
70          * parse partition descriptor
71          *
72          * <lba_start> <lba_size> [mmcpart <num>]
73          */
74         for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
75                 *parg = strsep(&raw_part_desc, " ");
76                 if (*parg == NULL) {
77                         pr_err("Invalid number of arguments.\n");
78                         return -ENODEV;
79                 }
80         }
81
82         info->start = simple_strtoul(argv[0], NULL, 0);
83         info->size = simple_strtoul(argv[1], NULL, 0);
84         info->blksz = dev_desc->blksz;
85         strncpy((char *)info->name, name, PART_NAME_LEN);
86
87         if (raw_part_desc) {
88                 if (strcmp(strsep(&raw_part_desc, " "), "mmcpart") == 0)
89                         *mmcpart = simple_strtoul(raw_part_desc, NULL, 0);
90         }
91
92         return 0;
93 }
94
95 /**
96  * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE
97  *
98  * @block_dev: Pointer to block device
99  * @start: First block to write/erase
100  * @blkcnt: Count of blocks
101  * @buffer: Pointer to data buffer for write or NULL for erase
102  */
103 static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
104                                  lbaint_t blkcnt, const void *buffer)
105 {
106         lbaint_t blk = start;
107         lbaint_t blks_written;
108         lbaint_t cur_blkcnt;
109         lbaint_t blks = 0;
110         int i;
111
112         for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
113                 cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
114                 if (buffer) {
115                         if (fastboot_progress_callback)
116                                 fastboot_progress_callback("writing");
117                         blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
118                                                   buffer + (i * block_dev->blksz));
119                 } else {
120                         if (fastboot_progress_callback)
121                                 fastboot_progress_callback("erasing");
122                         blks_written = blk_derase(block_dev, blk, cur_blkcnt);
123                 }
124                 blk += blks_written;
125                 blks += blks_written;
126         }
127         return blks;
128 }
129
130 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
131                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
132 {
133         struct fb_mmc_sparse *sparse = info->priv;
134         struct blk_desc *dev_desc = sparse->dev_desc;
135
136         return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
137 }
138
139 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
140                 lbaint_t blk, lbaint_t blkcnt)
141 {
142         return blkcnt;
143 }
144
145 static void write_raw_image(struct blk_desc *dev_desc,
146                             struct disk_partition *info, const char *part_name,
147                             void *buffer, u32 download_bytes, char *response)
148 {
149         lbaint_t blkcnt;
150         lbaint_t blks;
151
152         /* determine number of blocks to write */
153         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
154         blkcnt = lldiv(blkcnt, info->blksz);
155
156         if (blkcnt > info->size) {
157                 pr_err("too large for partition: '%s'\n", part_name);
158                 fastboot_fail("too large for partition", response);
159                 return;
160         }
161
162         puts("Flashing Raw Image\n");
163
164         blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
165
166         if (blks != blkcnt) {
167                 pr_err("failed writing to device %d\n", dev_desc->devnum);
168                 fastboot_fail("failed writing to device", response);
169                 return;
170         }
171
172         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
173                part_name);
174         fastboot_okay(NULL, response);
175 }
176
177 #if defined(CONFIG_FASTBOOT_MMC_BOOT_SUPPORT) || \
178         defined(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
179 static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
180 {
181         lbaint_t blks;
182
183         debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
184
185         blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
186
187         if (blks != dev_desc->lba) {
188                 pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
189                 return 1;
190         }
191
192         printf("........ erased %lu bytes from mmc hwpart[%u]\n",
193                dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
194
195         return 0;
196 }
197 #endif
198
199 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
200 static void fb_mmc_boot_ops(struct blk_desc *dev_desc, void *buffer,
201                             int hwpart, u32 buff_sz, char *response)
202 {
203         lbaint_t blkcnt;
204         lbaint_t blks;
205         unsigned long blksz;
206
207         // To operate on EMMC_BOOT1/2 (mmc0boot0/1) we first change the hwpart
208         if (blk_dselect_hwpart(dev_desc, hwpart)) {
209                 pr_err("Failed to select hwpart\n");
210                 fastboot_fail("Failed to select hwpart", response);
211                 return;
212         }
213
214         if (buffer) { /* flash */
215
216                 /* determine number of blocks to write */
217                 blksz = dev_desc->blksz;
218                 blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
219                 blkcnt = lldiv(blkcnt, blksz);
220
221                 if (blkcnt > dev_desc->lba) {
222                         pr_err("Image size too large\n");
223                         fastboot_fail("Image size too large", response);
224                         return;
225                 }
226
227                 debug("Start Flashing Image to EMMC_BOOT%d...\n", hwpart);
228
229                 blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
230
231                 if (blks != blkcnt) {
232                         pr_err("Failed to write EMMC_BOOT%d\n", hwpart);
233                         fastboot_fail("Failed to write EMMC_BOOT part",
234                                       response);
235                         return;
236                 }
237
238                 printf("........ wrote %lu bytes to EMMC_BOOT%d\n",
239                        blkcnt * blksz, hwpart);
240         } else { /* erase */
241                 if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
242                         pr_err("Failed to erase EMMC_BOOT%d\n", hwpart);
243                         fastboot_fail("Failed to erase EMMC_BOOT part",
244                                       response);
245                         return;
246                 }
247         }
248
249         fastboot_okay(NULL, response);
250 }
251 #endif
252
253 #ifdef CONFIG_ANDROID_BOOT_IMAGE
254 /**
255  * Read Android boot image header from boot partition.
256  *
257  * @param[in] dev_desc MMC device descriptor
258  * @param[in] info Boot partition info
259  * @param[out] hdr Where to store read boot image header
260  *
261  * @return Boot image header sectors count or 0 on error
262  */
263 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
264                                        struct disk_partition *info,
265                                        struct andr_img_hdr *hdr,
266                                        char *response)
267 {
268         ulong sector_size;              /* boot partition sector size */
269         lbaint_t hdr_sectors;           /* boot image header sectors count */
270         int res;
271
272         /* Calculate boot image sectors count */
273         sector_size = info->blksz;
274         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_img_hdr), sector_size);
275         if (hdr_sectors == 0) {
276                 pr_err("invalid number of boot sectors: 0\n");
277                 fastboot_fail("invalid number of boot sectors: 0", response);
278                 return 0;
279         }
280
281         /* Read the boot image header */
282         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
283         if (res != hdr_sectors) {
284                 pr_err("cannot read header from boot partition\n");
285                 fastboot_fail("cannot read header from boot partition",
286                               response);
287                 return 0;
288         }
289
290         /* Check boot header magic string */
291         res = android_image_check_header(hdr);
292         if (res != 0) {
293                 pr_err("bad boot image magic\n");
294                 fastboot_fail("boot partition not initialized", response);
295                 return 0;
296         }
297
298         return hdr_sectors;
299 }
300
301 /**
302  * Write downloaded zImage to boot partition and repack it properly.
303  *
304  * @param dev_desc MMC device descriptor
305  * @param download_buffer Address to fastboot buffer with zImage in it
306  * @param download_bytes Size of fastboot buffer, in bytes
307  *
308  * @return 0 on success or -1 on error
309  */
310 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
311                                 void *download_buffer,
312                                 u32 download_bytes,
313                                 char *response)
314 {
315         uintptr_t hdr_addr;                     /* boot image header address */
316         struct andr_img_hdr *hdr;               /* boot image header */
317         lbaint_t hdr_sectors;                   /* boot image header sectors */
318         u8 *ramdisk_buffer;
319         u32 ramdisk_sector_start;
320         u32 ramdisk_sectors;
321         u32 kernel_sector_start;
322         u32 kernel_sectors;
323         u32 sectors_per_page;
324         struct disk_partition info;
325         int res;
326
327         puts("Flashing zImage\n");
328
329         /* Get boot partition info */
330         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
331         if (res < 0) {
332                 pr_err("cannot find boot partition\n");
333                 fastboot_fail("cannot find boot partition", response);
334                 return -1;
335         }
336
337         /* Put boot image header in fastboot buffer after downloaded zImage */
338         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
339         hdr = (struct andr_img_hdr *)hdr_addr;
340
341         /* Read boot image header */
342         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
343         if (hdr_sectors == 0) {
344                 pr_err("unable to read boot image header\n");
345                 fastboot_fail("unable to read boot image header", response);
346                 return -1;
347         }
348
349         /* Check if boot image has second stage in it (we don't support it) */
350         if (hdr->second_size > 0) {
351                 pr_err("moving second stage is not supported yet\n");
352                 fastboot_fail("moving second stage is not supported yet",
353                               response);
354                 return -1;
355         }
356
357         /* Extract ramdisk location */
358         sectors_per_page = hdr->page_size / info.blksz;
359         ramdisk_sector_start = info.start + sectors_per_page;
360         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
361                                              sectors_per_page;
362         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
363                                        sectors_per_page;
364
365         /* Read ramdisk and put it in fastboot buffer after boot image header */
366         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
367         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
368                         ramdisk_buffer);
369         if (res != ramdisk_sectors) {
370                 pr_err("cannot read ramdisk from boot partition\n");
371                 fastboot_fail("cannot read ramdisk from boot partition",
372                               response);
373                 return -1;
374         }
375
376         /* Write new kernel size to boot image header */
377         hdr->kernel_size = download_bytes;
378         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
379         if (res == 0) {
380                 pr_err("cannot writeback boot image header\n");
381                 fastboot_fail("cannot write back boot image header", response);
382                 return -1;
383         }
384
385         /* Write the new downloaded kernel */
386         kernel_sector_start = info.start + sectors_per_page;
387         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
388                                       sectors_per_page;
389         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
390                          download_buffer);
391         if (res == 0) {
392                 pr_err("cannot write new kernel\n");
393                 fastboot_fail("cannot write new kernel", response);
394                 return -1;
395         }
396
397         /* Write the saved ramdisk back */
398         ramdisk_sector_start = info.start + sectors_per_page;
399         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
400                                              sectors_per_page;
401         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
402                          ramdisk_buffer);
403         if (res == 0) {
404                 pr_err("cannot write back original ramdisk\n");
405                 fastboot_fail("cannot write back original ramdisk", response);
406                 return -1;
407         }
408
409         puts("........ zImage was updated in boot partition\n");
410         fastboot_okay(NULL, response);
411         return 0;
412 }
413 #endif
414
415 /**
416  * fastboot_mmc_get_part_info() - Lookup eMMC partion by name
417  *
418  * @part_name: Named partition to lookup
419  * @dev_desc: Pointer to returned blk_desc pointer
420  * @part_info: Pointer to returned struct disk_partition
421  * @response: Pointer to fastboot response buffer
422  */
423 int fastboot_mmc_get_part_info(const char *part_name,
424                                struct blk_desc **dev_desc,
425                                struct disk_partition *part_info, char *response)
426 {
427         int r = 0;
428         int mmcpart;
429
430         *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
431         if (!*dev_desc) {
432                 fastboot_fail("block device not found", response);
433                 return -ENOENT;
434         }
435         if (!part_name || !strcmp(part_name, "")) {
436                 fastboot_fail("partition not given", response);
437                 return -ENOENT;
438         }
439
440         if (raw_part_get_info_by_name(*dev_desc, part_name, part_info, &mmcpart) < 0) {
441                 r = part_get_info_by_name_or_alias(*dev_desc, part_name, part_info);
442                 if (r < 0) {
443                         fastboot_fail("partition not found", response);
444                         return r;
445                 }
446         }
447
448         return r;
449 }
450
451 /**
452  * fastboot_mmc_flash_write() - Write image to eMMC for fastboot
453  *
454  * @cmd: Named partition to write image to
455  * @download_buffer: Pointer to image data
456  * @download_bytes: Size of image data
457  * @response: Pointer to fastboot response buffer
458  */
459 void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
460                               u32 download_bytes, char *response)
461 {
462         struct blk_desc *dev_desc;
463         struct disk_partition info;
464         int mmcpart = 0;
465
466         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
467         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
468                 pr_err("invalid mmc device\n");
469                 fastboot_fail("invalid mmc device", response);
470                 return;
471         }
472
473 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
474         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
475                 fb_mmc_boot_ops(dev_desc, download_buffer, 1,
476                                 download_bytes, response);
477                 return;
478         }
479         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
480                 fb_mmc_boot_ops(dev_desc, download_buffer, 2,
481                                 download_bytes, response);
482                 return;
483         }
484 #endif
485
486 #if CONFIG_IS_ENABLED(EFI_PARTITION)
487 #ifndef CONFIG_FASTBOOT_MMC_USER_SUPPORT
488         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
489 #else
490         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0 ||
491             strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
492 #endif
493                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
494                        __func__);
495                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
496                         printf("%s: invalid GPT - refusing to write to flash\n",
497                                __func__);
498                         fastboot_fail("invalid GPT partition", response);
499                         return;
500                 }
501                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
502                         printf("%s: writing GPT partitions failed\n", __func__);
503                         fastboot_fail("writing GPT partitions failed",
504                                       response);
505                         return;
506                 }
507                 part_init(dev_desc);
508                 printf("........ success\n");
509                 fastboot_okay(NULL, response);
510                 return;
511         }
512 #endif
513
514 #if CONFIG_IS_ENABLED(DOS_PARTITION)
515         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
516                 printf("%s: updating MBR\n", __func__);
517                 if (is_valid_dos_buf(download_buffer)) {
518                         printf("%s: invalid MBR - refusing to write to flash\n",
519                                __func__);
520                         fastboot_fail("invalid MBR partition", response);
521                         return;
522                 }
523                 if (write_mbr_sector(dev_desc, download_buffer)) {
524                         printf("%s: writing MBR partition failed\n", __func__);
525                         fastboot_fail("writing MBR partition failed",
526                                       response);
527                         return;
528                 }
529                 part_init(dev_desc);
530                 printf("........ success\n");
531                 fastboot_okay(NULL, response);
532                 return;
533         }
534 #endif
535
536 #ifdef CONFIG_ANDROID_BOOT_IMAGE
537         if (strncasecmp(cmd, "zimage", 6) == 0) {
538                 fb_mmc_update_zimage(dev_desc, download_buffer,
539                                      download_bytes, response);
540                 return;
541         }
542 #endif
543
544         if (raw_part_get_info_by_name(dev_desc, cmd, &info, &mmcpart) == 0) {
545                 if (blk_dselect_hwpart(dev_desc, mmcpart)) {
546                         pr_err("Failed to select hwpart\n");
547                         fastboot_fail("Failed to select hwpart", response);
548                         return;
549                 }
550         } else if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
551                 pr_err("cannot find partition: '%s'\n", cmd);
552                 fastboot_fail("cannot find partition", response);
553                 return;
554         }
555
556         if (is_sparse_image(download_buffer)) {
557                 struct fb_mmc_sparse sparse_priv;
558                 struct sparse_storage sparse;
559                 int err;
560
561                 sparse_priv.dev_desc = dev_desc;
562
563                 sparse.blksz = info.blksz;
564                 sparse.start = info.start;
565                 sparse.size = info.size;
566                 sparse.write = fb_mmc_sparse_write;
567                 sparse.reserve = fb_mmc_sparse_reserve;
568                 sparse.mssg = fastboot_fail;
569
570                 printf("Flashing sparse image at offset " LBAFU "\n",
571                        sparse.start);
572
573                 sparse.priv = &sparse_priv;
574                 err = write_sparse_image(&sparse, cmd, download_buffer,
575                                          response);
576                 if (!err)
577                         fastboot_okay(NULL, response);
578         } else {
579                 write_raw_image(dev_desc, &info, cmd, download_buffer,
580                                 download_bytes, response);
581         }
582 }
583
584 /**
585  * fastboot_mmc_flash_erase() - Erase eMMC for fastboot
586  *
587  * @cmd: Named partition to erase
588  * @response: Pointer to fastboot response buffer
589  */
590 void fastboot_mmc_erase(const char *cmd, char *response)
591 {
592         struct blk_desc *dev_desc;
593         struct disk_partition info;
594         lbaint_t blks, blks_start, blks_size, grp_size;
595         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
596         int mmcpart = 0;
597
598         if (mmc == NULL) {
599                 pr_err("invalid mmc device\n");
600                 fastboot_fail("invalid mmc device", response);
601                 return;
602         }
603
604         dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
605         if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
606                 pr_err("invalid mmc device\n");
607                 fastboot_fail("invalid mmc device", response);
608                 return;
609         }
610
611 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
612         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
613                 /* erase EMMC boot1 */
614                 fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
615                 return;
616         }
617         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
618                 /* erase EMMC boot2 */
619                 fb_mmc_boot_ops(dev_desc, NULL, 2, 0, response);
620                 return;
621         }
622 #endif
623
624 #ifdef CONFIG_FASTBOOT_MMC_USER_SUPPORT
625         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
626                 /* erase EMMC userdata */
627                 if (fb_mmc_erase_mmc_hwpart(dev_desc))
628                         fastboot_fail("Failed to erase EMMC_USER", response);
629                 else
630                         fastboot_okay(NULL, response);
631                 return;
632         }
633 #endif
634
635         if (raw_part_get_info_by_name(dev_desc, cmd, &info, &mmcpart) == 0) {
636                 if (blk_dselect_hwpart(dev_desc, mmcpart)) {
637                         pr_err("Failed to select hwpart\n");
638                         fastboot_fail("Failed to select hwpart", response);
639                         return;
640                 }
641         } else if (part_get_info_by_name_or_alias(dev_desc, cmd, &info) < 0) {
642                 pr_err("cannot find partition: '%s'\n", cmd);
643                 fastboot_fail("cannot find partition", response);
644                 return;
645         }
646
647         /* Align blocks to erase group size to avoid erasing other partitions */
648         grp_size = mmc->erase_grp_size;
649         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
650         if (info.size >= grp_size)
651                 blks_size = (info.size - (blks_start - info.start)) &
652                                 (~(grp_size - 1));
653         else
654                 blks_size = 0;
655
656         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
657                blks_start, blks_start + blks_size);
658
659         blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
660
661         if (blks != blks_size) {
662                 pr_err("failed erasing from device %d\n", dev_desc->devnum);
663                 fastboot_fail("failed erasing from device", response);
664                 return;
665         }
666
667         printf("........ erased " LBAFU " bytes from '%s'\n",
668                blks_size * info.blksz, cmd);
669         fastboot_okay(NULL, response);
670 }