1 /*
2 * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
3 * Use of this source code is governed by a BSD-style license that can be
4 * found in the LICENSE file.
5 *
6 * Alternatively, this software may be distributed under the terms of the
7 * GNU General Public License ("GPL") version 2 as published by the Free
8 * Software Foundation.
9 */
10
11 #include <common.h>
12 #include <command.h>
13 #include <part.h>
14
do_read(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])15 int do_read(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
16 {
17 char *ep;
18 struct blk_desc *dev_desc = NULL;
19 int dev;
20 int part = 0;
21 struct disk_partition part_info;
22 ulong offset = 0u;
23 ulong limit = 0u;
24 void *addr;
25 uint blk;
26 uint cnt;
27
28 if (argc != 6) {
29 cmd_usage(cmdtp);
30 return 1;
31 }
32
33 dev = (int)simple_strtoul(argv[2], &ep, 16);
34 if (*ep) {
35 if (*ep != ':') {
36 printf("Invalid block device %s\n", argv[2]);
37 return 1;
38 }
39 part = (int)simple_strtoul(++ep, NULL, 16);
40 }
41
42 dev_desc = blk_get_dev(argv[1], dev);
43 if (dev_desc == NULL) {
44 printf("Block device %s %d not supported\n", argv[1], dev);
45 return 1;
46 }
47
48 addr = (void *)simple_strtoul(argv[3], NULL, 16);
49 blk = simple_strtoul(argv[4], NULL, 16);
50 cnt = simple_strtoul(argv[5], NULL, 16);
51
52 if (part != 0) {
53 if (part_get_info(dev_desc, part, &part_info)) {
54 printf("Cannot find partition %d\n", part);
55 return 1;
56 }
57 offset = part_info.start;
58 limit = part_info.size;
59 } else {
60 /* Largest address not available in struct blk_desc. */
61 limit = ~0;
62 }
63
64 if (cnt + blk > limit) {
65 printf("Read out of range\n");
66 return 1;
67 }
68
69 if (blk_dread(dev_desc, offset + blk, cnt, addr) != cnt) {
70 printf("Error reading blocks\n");
71 return 1;
72 }
73
74 return 0;
75 }
76
77 U_BOOT_CMD(
78 read, 6, 0, do_read,
79 "Load binary data from a partition",
80 "<interface> <dev[:part]> addr blk# cnt"
81 );
82