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