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Merge tag 'u-boot-imx-master-20250127' of https://gitlab.denx.de/u-boot/custodians...
[J-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 <blk.h>
8 #include <env.h>
9 #include <fastboot.h>
10 #include <fastboot-internal.h>
11 #include <fb_mmc.h>
12 #include <image-sparse.h>
13 #include <image.h>
14 #include <log.h>
15 #include <part.h>
16 #include <mmc.h>
17 #include <div64.h>
18 #include <linux/compat.h>
19 #include <android_image.h>
20
21 #define BOOT_PARTITION_NAME "boot"
22
23 struct fb_mmc_sparse {
24         struct blk_desc *dev_desc;
25 };
26
27 static int raw_part_get_info_by_name(struct blk_desc *dev_desc,
28                                      const char *name,
29                                      struct disk_partition *info)
30 {
31         /* strlen("fastboot_raw_partition_") + PART_NAME_LEN + 1 */
32         char env_desc_name[23 + PART_NAME_LEN + 1];
33         char *raw_part_desc;
34         const char *argv[2];
35         const char **parg = argv;
36
37         /* check for raw partition descriptor */
38         strcpy(env_desc_name, "fastboot_raw_partition_");
39         strlcat(env_desc_name, name, sizeof(env_desc_name));
40         raw_part_desc = strdup(env_get(env_desc_name));
41         if (raw_part_desc == NULL)
42                 return -ENODEV;
43
44         /*
45          * parse partition descriptor
46          *
47          * <lba_start> <lba_size> [mmcpart <num>]
48          */
49         for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
50                 *parg = strsep(&raw_part_desc, " ");
51                 if (*parg == NULL) {
52                         pr_err("Invalid number of arguments.\n");
53                         return -ENODEV;
54                 }
55         }
56
57         info->start = simple_strtoul(argv[0], NULL, 0);
58         info->size = simple_strtoul(argv[1], NULL, 0);
59         info->blksz = dev_desc->blksz;
60         strlcpy((char *)info->name, name, PART_NAME_LEN);
61
62         if (raw_part_desc) {
63                 if (strcmp(strsep(&raw_part_desc, " "), "mmcpart") == 0) {
64                         ulong mmcpart = simple_strtoul(raw_part_desc, NULL, 0);
65                         int ret = blk_dselect_hwpart(dev_desc, mmcpart);
66
67                         if (ret)
68                                 return ret;
69                 }
70         }
71
72         return 0;
73 }
74
75 static int do_get_part_info(struct blk_desc **dev_desc, const char *name,
76                             struct disk_partition *info)
77 {
78         int ret;
79
80         /* First try partition names on the default device */
81         *dev_desc = blk_get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
82         if (*dev_desc) {
83                 ret = part_get_info_by_name(*dev_desc, name, info);
84                 if (ret >= 0)
85                         return ret;
86
87                 /* Then try raw partitions */
88                 ret = raw_part_get_info_by_name(*dev_desc, name, info);
89                 if (ret >= 0)
90                         return ret;
91         }
92
93         /* Then try dev.hwpart:part */
94         ret = part_get_info_by_dev_and_name_or_num("mmc", name, dev_desc,
95                                                    info, true);
96         return ret;
97 }
98
99 static int part_get_info_by_name_or_alias(struct blk_desc **dev_desc,
100                                           const char *name,
101                                           struct disk_partition *info)
102 {
103         /* strlen("fastboot_partition_alias_") + PART_NAME_LEN + 1 */
104         char env_alias_name[25 + PART_NAME_LEN + 1];
105         char *aliased_part_name;
106
107         /* check for alias */
108         strlcpy(env_alias_name, "fastboot_partition_alias_", sizeof(env_alias_name));
109         strlcat(env_alias_name, name, sizeof(env_alias_name));
110         aliased_part_name = env_get(env_alias_name);
111         if (aliased_part_name)
112                 name = aliased_part_name;
113
114         return do_get_part_info(dev_desc, name, info);
115 }
116
117 /**
118  * fb_mmc_blk_write() - Write/erase MMC in chunks of FASTBOOT_MAX_BLK_WRITE
119  *
120  * @block_dev: Pointer to block device
121  * @start: First block to write/erase
122  * @blkcnt: Count of blocks
123  * @buffer: Pointer to data buffer for write or NULL for erase
124  */
125 static lbaint_t fb_mmc_blk_write(struct blk_desc *block_dev, lbaint_t start,
126                                  lbaint_t blkcnt, const void *buffer)
127 {
128         lbaint_t blk = start;
129         lbaint_t blks_written;
130         lbaint_t cur_blkcnt;
131         lbaint_t blks = 0;
132         int i;
133
134         for (i = 0; i < blkcnt; i += FASTBOOT_MAX_BLK_WRITE) {
135                 cur_blkcnt = min((int)blkcnt - i, FASTBOOT_MAX_BLK_WRITE);
136                 if (buffer) {
137                         if (fastboot_progress_callback)
138                                 fastboot_progress_callback("writing");
139                         blks_written = blk_dwrite(block_dev, blk, cur_blkcnt,
140                                                   buffer + (i * block_dev->blksz));
141                 } else {
142                         if (fastboot_progress_callback)
143                                 fastboot_progress_callback("erasing");
144                         blks_written = blk_derase(block_dev, blk, cur_blkcnt);
145                 }
146                 blk += blks_written;
147                 blks += blks_written;
148         }
149         return blks;
150 }
151
152 static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
153                 lbaint_t blk, lbaint_t blkcnt, const void *buffer)
154 {
155         struct fb_mmc_sparse *sparse = info->priv;
156         struct blk_desc *dev_desc = sparse->dev_desc;
157
158         return fb_mmc_blk_write(dev_desc, blk, blkcnt, buffer);
159 }
160
161 static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
162                 lbaint_t blk, lbaint_t blkcnt)
163 {
164         return blkcnt;
165 }
166
167 static void write_raw_image(struct blk_desc *dev_desc,
168                             struct disk_partition *info, const char *part_name,
169                             void *buffer, u32 download_bytes, char *response)
170 {
171         lbaint_t blkcnt;
172         lbaint_t blks;
173
174         /* determine number of blocks to write */
175         blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
176         blkcnt = lldiv(blkcnt, info->blksz);
177
178         if (blkcnt > info->size) {
179                 pr_err("too large for partition: '%s'\n", part_name);
180                 fastboot_fail("too large for partition", response);
181                 return;
182         }
183
184         puts("Flashing Raw Image\n");
185
186         blks = fb_mmc_blk_write(dev_desc, info->start, blkcnt, buffer);
187
188         if (blks != blkcnt) {
189                 pr_err("failed writing to device %d\n", dev_desc->devnum);
190                 fastboot_fail("failed writing to device", response);
191                 return;
192         }
193
194         printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
195                part_name);
196         fastboot_okay(NULL, response);
197 }
198
199 #if defined(CONFIG_FASTBOOT_MMC_BOOT_SUPPORT) || \
200         defined(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
201 static int fb_mmc_erase_mmc_hwpart(struct blk_desc *dev_desc)
202 {
203         lbaint_t blks;
204
205         debug("Start Erasing mmc hwpart[%u]...\n", dev_desc->hwpart);
206
207         blks = fb_mmc_blk_write(dev_desc, 0, dev_desc->lba, NULL);
208
209         if (blks != dev_desc->lba) {
210                 pr_err("Failed to erase mmc hwpart[%u]\n", dev_desc->hwpart);
211                 return 1;
212         }
213
214         printf("........ erased %lu bytes from mmc hwpart[%u]\n",
215                dev_desc->lba * dev_desc->blksz, dev_desc->hwpart);
216
217         return 0;
218 }
219 #endif
220
221 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
222 static void fb_mmc_boot_ops(struct blk_desc *dev_desc, void *buffer,
223                             int hwpart, u32 buff_sz, char *response)
224 {
225         lbaint_t blkcnt;
226         lbaint_t blks;
227         unsigned long blksz;
228
229         // To operate on EMMC_BOOT1/2 (mmc0boot0/1) we first change the hwpart
230         if (blk_dselect_hwpart(dev_desc, hwpart)) {
231                 pr_err("Failed to select hwpart\n");
232                 fastboot_fail("Failed to select hwpart", response);
233                 return;
234         }
235
236         if (buffer) { /* flash */
237
238                 /* determine number of blocks to write */
239                 blksz = dev_desc->blksz;
240                 blkcnt = ((buff_sz + (blksz - 1)) & ~(blksz - 1));
241                 blkcnt = lldiv(blkcnt, blksz);
242
243                 if (blkcnt > dev_desc->lba) {
244                         pr_err("Image size too large\n");
245                         fastboot_fail("Image size too large", response);
246                         return;
247                 }
248
249                 debug("Start Flashing Image to EMMC_BOOT%d...\n", hwpart);
250
251                 blks = fb_mmc_blk_write(dev_desc, 0, blkcnt, buffer);
252
253                 if (blks != blkcnt) {
254                         pr_err("Failed to write EMMC_BOOT%d\n", hwpart);
255                         fastboot_fail("Failed to write EMMC_BOOT part",
256                                       response);
257                         return;
258                 }
259
260                 printf("........ wrote %lu bytes to EMMC_BOOT%d\n",
261                        blkcnt * blksz, hwpart);
262         } else { /* erase */
263                 if (fb_mmc_erase_mmc_hwpart(dev_desc)) {
264                         pr_err("Failed to erase EMMC_BOOT%d\n", hwpart);
265                         fastboot_fail("Failed to erase EMMC_BOOT part",
266                                       response);
267                         return;
268                 }
269         }
270
271         fastboot_okay(NULL, response);
272 }
273 #endif
274
275 #ifdef CONFIG_ANDROID_BOOT_IMAGE
276 /**
277  * Read Android boot image header from boot partition.
278  *
279  * @param[in] dev_desc MMC device descriptor
280  * @param[in] info Boot partition info
281  * @param[out] hdr Where to store read boot image header
282  *
283  * Return: Boot image header sectors count or 0 on error
284  */
285 static lbaint_t fb_mmc_get_boot_header(struct blk_desc *dev_desc,
286                                        struct disk_partition *info,
287                                        struct andr_boot_img_hdr_v0 *hdr,
288                                        char *response)
289 {
290         ulong sector_size;              /* boot partition sector size */
291         lbaint_t hdr_sectors;           /* boot image header sectors count */
292         int res;
293
294         /* Calculate boot image sectors count */
295         sector_size = info->blksz;
296         hdr_sectors = DIV_ROUND_UP(sizeof(struct andr_boot_img_hdr_v0), sector_size);
297         if (hdr_sectors == 0) {
298                 pr_err("invalid number of boot sectors: 0\n");
299                 fastboot_fail("invalid number of boot sectors: 0", response);
300                 return 0;
301         }
302
303         /* Read the boot image header */
304         res = blk_dread(dev_desc, info->start, hdr_sectors, (void *)hdr);
305         if (res != hdr_sectors) {
306                 pr_err("cannot read header from boot partition\n");
307                 fastboot_fail("cannot read header from boot partition",
308                               response);
309                 return 0;
310         }
311
312         /* Check boot header magic string */
313         if (!is_android_boot_image_header(hdr)) {
314                 pr_err("bad boot image magic\n");
315                 fastboot_fail("boot partition not initialized", response);
316                 return 0;
317         }
318
319         return hdr_sectors;
320 }
321
322 /**
323  * Write downloaded zImage to boot partition and repack it properly.
324  *
325  * @param dev_desc MMC device descriptor
326  * @param download_buffer Address to fastboot buffer with zImage in it
327  * @param download_bytes Size of fastboot buffer, in bytes
328  *
329  * Return: 0 on success or -1 on error
330  */
331 static int fb_mmc_update_zimage(struct blk_desc *dev_desc,
332                                 void *download_buffer,
333                                 u32 download_bytes,
334                                 char *response)
335 {
336         uintptr_t hdr_addr;                     /* boot image header address */
337         struct andr_boot_img_hdr_v0 *hdr;               /* boot image header */
338         lbaint_t hdr_sectors;                   /* boot image header sectors */
339         u8 *ramdisk_buffer;
340         u32 ramdisk_sector_start;
341         u32 ramdisk_sectors;
342         u32 kernel_sector_start;
343         u32 kernel_sectors;
344         u32 sectors_per_page;
345         struct disk_partition info;
346         int res;
347
348         puts("Flashing zImage\n");
349
350         /* Get boot partition info */
351         res = part_get_info_by_name(dev_desc, BOOT_PARTITION_NAME, &info);
352         if (res < 0) {
353                 pr_err("cannot find boot partition\n");
354                 fastboot_fail("cannot find boot partition", response);
355                 return -1;
356         }
357
358         /* Put boot image header in fastboot buffer after downloaded zImage */
359         hdr_addr = (uintptr_t)download_buffer + ALIGN(download_bytes, PAGE_SIZE);
360         hdr = (struct andr_boot_img_hdr_v0 *)hdr_addr;
361
362         /* Read boot image header */
363         hdr_sectors = fb_mmc_get_boot_header(dev_desc, &info, hdr, response);
364         if (hdr_sectors == 0) {
365                 pr_err("unable to read boot image header\n");
366                 fastboot_fail("unable to read boot image header", response);
367                 return -1;
368         }
369
370         /* Check if boot image header version is 2 or less */
371         if (hdr->header_version > 2) {
372                 pr_err("zImage flashing supported only for boot images v2 and less\n");
373                 fastboot_fail("zImage flashing supported only for boot images v2 and less",
374                               response);
375                 return -EOPNOTSUPP;
376         }
377
378         /* Check if boot image has second stage in it (we don't support it) */
379         if (hdr->second_size > 0) {
380                 pr_err("moving second stage is not supported yet\n");
381                 fastboot_fail("moving second stage is not supported yet",
382                               response);
383                 return -1;
384         }
385
386         /* Extract ramdisk location */
387         sectors_per_page = hdr->page_size / info.blksz;
388         ramdisk_sector_start = info.start + sectors_per_page;
389         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
390                                              sectors_per_page;
391         ramdisk_sectors = DIV_ROUND_UP(hdr->ramdisk_size, hdr->page_size) *
392                                        sectors_per_page;
393
394         /* Read ramdisk and put it in fastboot buffer after boot image header */
395         ramdisk_buffer = (u8 *)hdr + (hdr_sectors * info.blksz);
396         res = blk_dread(dev_desc, ramdisk_sector_start, ramdisk_sectors,
397                         ramdisk_buffer);
398         if (res != ramdisk_sectors) {
399                 pr_err("cannot read ramdisk from boot partition\n");
400                 fastboot_fail("cannot read ramdisk from boot partition",
401                               response);
402                 return -1;
403         }
404
405         /* Write new kernel size to boot image header */
406         hdr->kernel_size = download_bytes;
407         res = blk_dwrite(dev_desc, info.start, hdr_sectors, (void *)hdr);
408         if (res == 0) {
409                 pr_err("cannot writeback boot image header\n");
410                 fastboot_fail("cannot write back boot image header", response);
411                 return -1;
412         }
413
414         /* Write the new downloaded kernel */
415         kernel_sector_start = info.start + sectors_per_page;
416         kernel_sectors = DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
417                                       sectors_per_page;
418         res = blk_dwrite(dev_desc, kernel_sector_start, kernel_sectors,
419                          download_buffer);
420         if (res == 0) {
421                 pr_err("cannot write new kernel\n");
422                 fastboot_fail("cannot write new kernel", response);
423                 return -1;
424         }
425
426         /* Write the saved ramdisk back */
427         ramdisk_sector_start = info.start + sectors_per_page;
428         ramdisk_sector_start += DIV_ROUND_UP(hdr->kernel_size, hdr->page_size) *
429                                              sectors_per_page;
430         res = blk_dwrite(dev_desc, ramdisk_sector_start, ramdisk_sectors,
431                          ramdisk_buffer);
432         if (res == 0) {
433                 pr_err("cannot write back original ramdisk\n");
434                 fastboot_fail("cannot write back original ramdisk", response);
435                 return -1;
436         }
437
438         puts("........ zImage was updated in boot partition\n");
439         fastboot_okay(NULL, response);
440         return 0;
441 }
442 #endif
443
444 /**
445  * fastboot_mmc_get_part_info() - Lookup eMMC partion by name
446  *
447  * @part_name: Named partition to lookup
448  * @dev_desc: Pointer to returned blk_desc pointer
449  * @part_info: Pointer to returned struct disk_partition
450  * @response: Pointer to fastboot response buffer
451  */
452 int fastboot_mmc_get_part_info(const char *part_name,
453                                struct blk_desc **dev_desc,
454                                struct disk_partition *part_info, char *response)
455 {
456         int ret;
457
458         if (!part_name || !strcmp(part_name, "")) {
459                 fastboot_fail("partition not given", response);
460                 return -ENOENT;
461         }
462
463         ret = part_get_info_by_name_or_alias(dev_desc, part_name, part_info);
464         if (ret < 0) {
465                 switch (ret) {
466                 case -ENOSYS:
467                 case -EINVAL:
468                         fastboot_fail("invalid partition or device", response);
469                         break;
470                 case -ENODEV:
471                         fastboot_fail("no such device", response);
472                         break;
473                 case -ENOENT:
474                         fastboot_fail("no such partition", response);
475                         break;
476                 case -EPROTONOSUPPORT:
477                         fastboot_fail("unknown partition table type", response);
478                         break;
479                 default:
480                         fastboot_fail("unanticipated error", response);
481                         break;
482                 }
483         }
484
485         return ret;
486 }
487
488 static struct blk_desc *fastboot_mmc_get_dev(char *response)
489 {
490         struct blk_desc *ret = blk_get_dev("mmc",
491                                            CONFIG_FASTBOOT_FLASH_MMC_DEV);
492
493         if (!ret || ret->type == DEV_TYPE_UNKNOWN) {
494                 pr_err("invalid mmc device\n");
495                 fastboot_fail("invalid mmc device", response);
496                 return NULL;
497         }
498         return ret;
499 }
500
501 /**
502  * fastboot_mmc_flash_write() - Write image to eMMC for fastboot
503  *
504  * @cmd: Named partition to write image to
505  * @download_buffer: Pointer to image data
506  * @download_bytes: Size of image data
507  * @response: Pointer to fastboot response buffer
508  */
509 void fastboot_mmc_flash_write(const char *cmd, void *download_buffer,
510                               u32 download_bytes, char *response)
511 {
512         struct blk_desc *dev_desc;
513         struct disk_partition info = {0};
514
515 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
516         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
517                 dev_desc = fastboot_mmc_get_dev(response);
518                 if (dev_desc)
519                         fb_mmc_boot_ops(dev_desc, download_buffer, 1,
520                                         download_bytes, response);
521                 return;
522         }
523         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
524                 dev_desc = fastboot_mmc_get_dev(response);
525                 if (dev_desc)
526                         fb_mmc_boot_ops(dev_desc, download_buffer, 2,
527                                         download_bytes, response);
528                 return;
529         }
530 #endif
531
532 #if CONFIG_IS_ENABLED(EFI_PARTITION)
533         if (strcmp(cmd, CONFIG_FASTBOOT_GPT_NAME) == 0) {
534                 dev_desc = fastboot_mmc_get_dev(response);
535                 if (!dev_desc)
536                         return;
537
538                 printf("%s: updating MBR, Primary and Backup GPT(s)\n",
539                        __func__);
540                 if (is_valid_gpt_buf(dev_desc, download_buffer)) {
541                         printf("%s: invalid GPT - refusing to write to flash\n",
542                                __func__);
543                         fastboot_fail("invalid GPT partition", response);
544                         return;
545                 }
546                 if (write_mbr_and_gpt_partitions(dev_desc, download_buffer)) {
547                         printf("%s: writing GPT partitions failed\n", __func__);
548                         fastboot_fail("writing GPT partitions failed",
549                                       response);
550                         return;
551                 }
552                 part_init(dev_desc);
553                 printf("........ success\n");
554                 fastboot_okay(NULL, response);
555                 return;
556         }
557 #endif
558
559 #if CONFIG_IS_ENABLED(DOS_PARTITION)
560         if (strcmp(cmd, CONFIG_FASTBOOT_MBR_NAME) == 0) {
561                 dev_desc = fastboot_mmc_get_dev(response);
562                 if (!dev_desc)
563                         return;
564
565                 printf("%s: updating MBR\n", __func__);
566                 if (is_valid_dos_buf(download_buffer)) {
567                         printf("%s: invalid MBR - refusing to write to flash\n",
568                                __func__);
569                         fastboot_fail("invalid MBR partition", response);
570                         return;
571                 }
572                 if (write_mbr_sector(dev_desc, download_buffer)) {
573                         printf("%s: writing MBR partition failed\n", __func__);
574                         fastboot_fail("writing MBR partition failed",
575                                       response);
576                         return;
577                 }
578                 part_init(dev_desc);
579                 printf("........ success\n");
580                 fastboot_okay(NULL, response);
581                 return;
582         }
583 #endif
584
585 #ifdef CONFIG_ANDROID_BOOT_IMAGE
586         if (strncasecmp(cmd, "zimage", 6) == 0) {
587                 dev_desc = fastboot_mmc_get_dev(response);
588                 if (dev_desc)
589                         fb_mmc_update_zimage(dev_desc, download_buffer,
590                                              download_bytes, response);
591                 return;
592         }
593 #endif
594
595 #if IS_ENABLED(CONFIG_FASTBOOT_MMC_USER_SUPPORT)
596         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
597                 dev_desc = fastboot_mmc_get_dev(response);
598                 if (!dev_desc)
599                         return;
600
601                 strlcpy((char *)&info.name, cmd, sizeof(info.name));
602                 info.size       = dev_desc->lba;
603                 info.blksz      = dev_desc->blksz;
604         }
605 #endif
606
607         if (!info.name[0] &&
608             fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
609                 return;
610
611         if (is_sparse_image(download_buffer)) {
612                 struct fb_mmc_sparse sparse_priv;
613                 struct sparse_storage sparse;
614                 int err;
615
616                 sparse_priv.dev_desc = dev_desc;
617
618                 sparse.blksz = info.blksz;
619                 sparse.start = info.start;
620                 sparse.size = info.size;
621                 sparse.write = fb_mmc_sparse_write;
622                 sparse.reserve = fb_mmc_sparse_reserve;
623                 sparse.mssg = fastboot_fail;
624
625                 printf("Flashing sparse image at offset " LBAFU "\n",
626                        sparse.start);
627
628                 sparse.priv = &sparse_priv;
629                 err = write_sparse_image(&sparse, cmd, download_buffer,
630                                          response);
631                 if (!err)
632                         fastboot_okay(NULL, response);
633         } else {
634                 write_raw_image(dev_desc, &info, cmd, download_buffer,
635                                 download_bytes, response);
636         }
637 }
638
639 /**
640  * fastboot_mmc_flash_erase() - Erase eMMC for fastboot
641  *
642  * @cmd: Named partition to erase
643  * @response: Pointer to fastboot response buffer
644  */
645 void fastboot_mmc_erase(const char *cmd, char *response)
646 {
647         struct blk_desc *dev_desc;
648         struct disk_partition info;
649         lbaint_t blks, blks_start, blks_size, grp_size;
650         struct mmc *mmc = find_mmc_device(CONFIG_FASTBOOT_FLASH_MMC_DEV);
651
652 #ifdef CONFIG_FASTBOOT_MMC_BOOT_SUPPORT
653         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT1_NAME) == 0) {
654                 /* erase EMMC boot1 */
655                 dev_desc = fastboot_mmc_get_dev(response);
656                 if (dev_desc)
657                         fb_mmc_boot_ops(dev_desc, NULL, 1, 0, response);
658                 return;
659         }
660         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_BOOT2_NAME) == 0) {
661                 /* erase EMMC boot2 */
662                 dev_desc = fastboot_mmc_get_dev(response);
663                 if (dev_desc)
664                         fb_mmc_boot_ops(dev_desc, NULL, 2, 0, response);
665                 return;
666         }
667 #endif
668
669 #ifdef CONFIG_FASTBOOT_MMC_USER_SUPPORT
670         if (strcmp(cmd, CONFIG_FASTBOOT_MMC_USER_NAME) == 0) {
671                 /* erase EMMC userdata */
672                 dev_desc = fastboot_mmc_get_dev(response);
673                 if (!dev_desc)
674                         return;
675
676                 if (fb_mmc_erase_mmc_hwpart(dev_desc))
677                         fastboot_fail("Failed to erase EMMC_USER", response);
678                 else
679                         fastboot_okay(NULL, response);
680                 return;
681         }
682 #endif
683
684         if (fastboot_mmc_get_part_info(cmd, &dev_desc, &info, response) < 0)
685                 return;
686
687         /* Align blocks to erase group size to avoid erasing other partitions */
688         grp_size = mmc->erase_grp_size;
689         blks_start = (info.start + grp_size - 1) & ~(grp_size - 1);
690         if (info.size >= grp_size)
691                 blks_size = (info.size - (blks_start - info.start)) &
692                                 (~(grp_size - 1));
693         else
694                 blks_size = 0;
695
696         printf("Erasing blocks " LBAFU " to " LBAFU " due to alignment\n",
697                blks_start, blks_start + blks_size);
698
699         blks = fb_mmc_blk_write(dev_desc, blks_start, blks_size, NULL);
700
701         if (blks != blks_size) {
702                 pr_err("failed erasing from device %d\n", dev_desc->devnum);
703                 fastboot_fail("failed erasing from device", response);
704                 return;
705         }
706
707         printf("........ erased " LBAFU " bytes from '%s'\n",
708                blks_size * info.blksz, cmd);
709         fastboot_okay(NULL, response);
710 }
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