1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright 2011 Freescale Semiconductor, Inc.
4 */
5
6#include <common.h>
7#include <mmc.h>
8#include <malloc.h>
9
10/*
11 * The environment variables are written to just after the u-boot image
12 * on SDCard, so we must read the MBR to get the start address and code
13 * length of the u-boot image, then calculate the address of the env.
14 */
15#define ESDHC_BOOT_IMAGE_SIZE	0x48
16#define ESDHC_BOOT_IMAGE_ADDR	0x50
17
18#define ESDHC_DEFAULT_ENVADDR	0x400
19
20int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
21{
22	u8 *tmp_buf;
23	u32 blklen, code_offset, code_len, n;
24
25	blklen = mmc->read_bl_len;
26	tmp_buf = malloc(blklen);
27	if (!tmp_buf)
28		return 1;
29
30	/* read out the first block, get the config data information */
31#ifdef CONFIG_BLK
32	n = blk_dread(mmc_get_blk_desc(mmc), 0, 1, tmp_buf);
33#else
34	n = mmc->block_dev.block_read(&mmc->block_dev, 0, 1, tmp_buf);
35#endif
36	if (!n) {
37		free(tmp_buf);
38		return 1;
39	}
40
41	/* Get the Source Address, from offset 0x50 */
42	code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR);
43
44	/* Get the code size from offset 0x48 */
45	code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE);
46
47#ifdef CONFIG_ESDHC_HC_BLK_ADDR
48	/*
49	 * On soc BSC9131, BSC9132:
50	 * In High Capacity SD Cards (> 2 GBytes), the 32-bit source address and
51	 * code length of these soc specify the memory address in block address
52	 * format. Block length is fixed to 512 bytes as per the SD High
53	 * Capacity specification.
54	 */
55	u64 tmp;
56
57	if (mmc->high_capacity) {
58		tmp = (u64)code_offset * blklen;
59		tmp += code_len * blklen;
60	} else
61		tmp = code_offset + code_len;
62
63	if ((tmp + CONFIG_ENV_SIZE > mmc->capacity) ||
64			(tmp > 0xFFFFFFFFU))
65		*env_addr = ESDHC_DEFAULT_ENVADDR;
66	else
67		*env_addr = tmp;
68
69	free(tmp_buf);
70
71	return 0;
72#endif
73
74	*env_addr = code_offset + code_len;
75
76	free(tmp_buf);
77
78	return 0;
79}
80