59cca0f4d998d1d6b87f9b7ca0a16180f8840bcd
[karo-tx-uboot.git] / drivers / mtd / spi / spi_spl_load.c
1 /*
2  * Copyright (C) 2011 OMICRON electronics GmbH
3  *
4  * based on drivers/mtd/nand/nand_spl_load.c
5  *
6  * Copyright (C) 2011
7  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
8  *
9  * SPDX-License-Identifier:     GPL-2.0+
10  */
11
12 #include <common.h>
13 #include <spi_flash.h>
14 #include <spl.h>
15
16 #ifdef CONFIG_SPL_OS_BOOT
17 /*
18  * Load the kernel, check for a valid header we can parse, and if found load
19  * the kernel and then device tree.
20  */
21 static int spi_load_image_os(struct spi_flash *flash,
22                              struct image_header *header)
23 {
24         /* Read for a header, parse or error out. */
25         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
26                        (void *)header);
27
28         if (image_get_magic(header) != IH_MAGIC)
29                 return -1;
30
31         spl_parse_image_header(header);
32
33         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
34                        spl_image.size, (void *)spl_image.load_addr);
35
36         /* Read device tree. */
37         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
38                        CONFIG_SYS_SPI_ARGS_SIZE,
39                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
40
41         return 0;
42 }
43 #endif
44
45 /*
46  * The main entry for SPI booting. It's necessary that SDRAM is already
47  * configured and available since this code loads the main U-Boot image
48  * from SPI into SDRAM and starts it from there.
49  */
50 void spl_spi_load_image(void)
51 {
52         struct spi_flash *flash;
53         struct image_header *header;
54
55         /*
56          * Load U-Boot image from SPI flash into RAM
57          */
58
59         flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
60                                 CONFIG_SF_DEFAULT_CS,
61                                 CONFIG_SF_DEFAULT_SPEED,
62                                 CONFIG_SF_DEFAULT_MODE);
63         if (!flash) {
64                 puts("SPI probe failed.\n");
65                 hang();
66         }
67
68         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
69         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
70
71 #ifdef CONFIG_SPL_OS_BOOT
72         if (spl_start_uboot() || spi_load_image_os(flash, header))
73 #endif
74         {
75                 /* Load u-boot, mkimage header is 64 bytes. */
76                 spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
77                                (void *)header);
78                 spl_parse_image_header(header);
79                 spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
80                                spl_image.size, (void *)spl_image.load_addr);
81         }
82 }