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
mmc_get_env_addr(struct mmc * mmc,int copy,u32 * env_addr)20 int 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