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