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1 /*
2  * (C) Copyright 2015 Google,  Inc
3  * Written by Simon Glass <sjg@chromium.org>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  *
7  * See README.rockchip for details of the rkspi format
8  */
9
10 #include "imagetool.h"
11 #include <image.h>
12 #include <rc4.h>
13 #include "mkimage.h"
14 #include "rkcommon.h"
15
16 enum {
17         RKSPI_SPL_HDR_START     = RK_CODE1_OFFSET * RK_BLK_SIZE,
18         RKSPI_SPL_START         = RKSPI_SPL_HDR_START + 4,
19         RKSPI_HEADER_LEN        = RKSPI_SPL_START,
20         RKSPI_SECT_LEN          = RK_BLK_SIZE * 4,
21 };
22
23 static char dummy_hdr[RKSPI_HEADER_LEN];
24
25 static int rkspi_check_params(struct image_tool_params *params)
26 {
27         return 0;
28 }
29
30 static int rkspi_verify_header(unsigned char *buf, int size,
31                                struct image_tool_params *params)
32 {
33         return 0;
34 }
35
36 static void rkspi_print_header(const void *buf)
37 {
38 }
39
40 static void rkspi_set_header(void *buf, struct stat *sbuf, int ifd,
41                              struct image_tool_params *params)
42 {
43         int sector;
44         unsigned int size;
45         int ret;
46
47         size = params->orig_file_size;
48         ret = rkcommon_set_header(buf, size);
49         debug("size %x\n", size);
50         if (ret) {
51                 /* TODO(sjg@chromium.org): This method should return an error */
52                 printf("Warning: SPL image is too large (size %#x) and will not boot\n",
53                        size);
54         }
55
56         memcpy(buf + RKSPI_SPL_HDR_START, "RK32", 4);
57
58         /*
59          * Spread the image out so we only use the first 2KB of each 4KB
60          * region. This is a feature of the SPI format required by the Rockchip
61          * boot ROM. Its rationale is unknown.
62          */
63         for (sector = size / RKSPI_SECT_LEN - 1; sector >= 0; sector--) {
64                 printf("sector %u\n", sector);
65                 memmove(buf + sector * RKSPI_SECT_LEN * 2,
66                         buf + sector * RKSPI_SECT_LEN,
67                         RKSPI_SECT_LEN);
68                 memset(buf + sector * RKSPI_SECT_LEN * 2 + RKSPI_SECT_LEN,
69                        '\0', RKSPI_SECT_LEN);
70         }
71 }
72
73 static int rkspi_extract_subimage(void *buf, struct image_tool_params *params)
74 {
75         return 0;
76 }
77
78 static int rkspi_check_image_type(uint8_t type)
79 {
80         if (type == IH_TYPE_RKSPI)
81                 return EXIT_SUCCESS;
82         else
83                 return EXIT_FAILURE;
84 }
85
86 /* We pad the file out to a fixed size - this method returns that size */
87 static int rkspi_vrec_header(struct image_tool_params *params,
88                              struct image_type_params *tparams)
89 {
90         int pad_size;
91
92         pad_size = (RK_MAX_CODE1_SIZE + 0x7ff) / 0x800 * 0x800;
93         params->orig_file_size = pad_size;
94
95         /* We will double the image size due to the SPI format */
96         pad_size *= 2;
97         pad_size += RKSPI_SPL_HDR_START;
98         debug("pad_size %x\n", pad_size);
99
100         return pad_size - params->file_size;
101 }
102
103 /*
104  * rk_spi parameters
105  */
106 U_BOOT_IMAGE_TYPE(
107         rkspi,
108         "Rockchip SPI Boot Image support",
109         RKSPI_HEADER_LEN,
110         dummy_hdr,
111         rkspi_check_params,
112         rkspi_verify_header,
113         rkspi_print_header,
114         rkspi_set_header,
115         rkspi_extract_subimage,
116         rkspi_check_image_type,
117         NULL,
118         rkspi_vrec_header
119 );