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