1 /*
2  * (C) Copyright 2007-2011
3  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
4  * Tom Cubie <tangliang@allwinnertech.com>
5  *
6  * SPDX-License-Identifier:	GPL-2.0+
7  */
8 #ifndef	_ASM_ARCH_SPL_H_
9 #define	_ASM_ARCH_SPL_H_
10 
11 #define BOOT0_MAGIC		"eGON.BT0"
12 #define SPL_SIGNATURE		"SPL" /* marks "sunxi" SPL header */
13 #define SPL_HEADER_VERSION	2
14 
15 #ifdef CONFIG_SUNXI_HIGH_SRAM
16 #define SPL_ADDR		0x10000
17 #else
18 #define SPL_ADDR		0x0
19 #endif
20 
21 /* The low 8-bits of the 'boot_media' field in the SPL header */
22 #define SUNXI_BOOTED_FROM_MMC0	0
23 #define SUNXI_BOOTED_FROM_NAND	1
24 #define SUNXI_BOOTED_FROM_MMC2	2
25 #define SUNXI_BOOTED_FROM_SPI	3
26 
27 /* boot head definition from sun4i boot code */
28 struct boot_file_head {
29 	uint32_t b_instruction;	/* one intruction jumping to real code */
30 	uint8_t magic[8];	/* ="eGON.BT0" or "eGON.BT1", not C-style str */
31 	uint32_t check_sum;	/* generated by PC */
32 	uint32_t length;	/* generated by PC */
33 	/*
34 	 * We use a simplified header, only filling in what is needed
35 	 * by the boot ROM. To be compatible with Allwinner tools we
36 	 * would need to implement the proper fields here instead of
37 	 * padding.
38 	 *
39 	 * Actually we want the ability to recognize our "sunxi" variant
40 	 * of the SPL. To do so, let's place a special signature into the
41 	 * "pub_head_size" field. We can reasonably expect Allwinner's
42 	 * boot0 to always have the upper 16 bits of this set to 0 (after
43 	 * all the value shouldn't be larger than the limit imposed by
44 	 * SRAM size).
45 	 * If the signature is present (at 0x14), then we know it's safe
46 	 * to use the remaining 8 bytes (at 0x18) for our own purposes.
47 	 * (E.g. sunxi-tools "fel" utility can pass information there.)
48 	 */
49 	union {
50 		uint32_t pub_head_size;
51 		uint8_t spl_signature[4];
52 	};
53 	uint32_t fel_script_address;
54 	/*
55 	 * If the fel_uEnv_length member below is set to a non-zero value,
56 	 * it specifies the size (byte count) of data at fel_script_address.
57 	 * At the same time this indicates that the data is in uEnv.txt
58 	 * compatible format, ready to be imported via "env import -t".
59 	 */
60 	uint32_t fel_uEnv_length;
61 	/*
62 	 * Offset of an ASCIIZ string (relative to the SPL header), which
63 	 * contains the default device tree name (CONFIG_DEFAULT_DEVICE_TREE).
64 	 * This is optional and may be set to NULL. Is intended to be used
65 	 * by flash programming tools for providing nice informative messages
66 	 * to the users.
67 	 */
68 	uint32_t dt_name_offset;
69 	uint32_t reserved1;
70 	uint32_t boot_media;		/* written here by the boot ROM */
71 	/* A padding area (may be used for storing text strings) */
72 	uint32_t string_pool[13];
73 	/* The header must be a multiple of 32 bytes (for VBAR alignment) */
74 };
75 
76 /* Compile time check to assure proper alignment of structure */
77 typedef char boot_file_head_not_multiple_of_32[1 - 2*(sizeof(struct boot_file_head) % 32)];
78 
79 #define is_boot0_magic(addr)	(memcmp((void *)addr, BOOT0_MAGIC, 8) == 0)
80 
81 #endif
82