2e0c871219bd05ac31c63a80ba793e1dc1255899
[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.h>
14 #include <spi_flash.h>
15 #include <spl.h>
16
17 #ifdef CONFIG_SPL_OS_BOOT
18 /*
19  * Load the kernel, check for a valid header we can parse, and if found load
20  * the kernel and then device tree.
21  */
22 static int spi_load_image_os(struct spi_flash *flash,
23                              struct image_header *header)
24 {
25         /* Read for a header, parse or error out. */
26         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS, 0x40,
27                        (void *)header);
28
29         if (image_get_magic(header) != IH_MAGIC)
30                 return -1;
31
32         spl_parse_image_header(header);
33
34         spi_flash_read(flash, CONFIG_SYS_SPI_KERNEL_OFFS,
35                        spl_image.size, (void *)spl_image.load_addr);
36
37         /* Read device tree. */
38         spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
39                        CONFIG_SYS_SPI_ARGS_SIZE,
40                        (void *)CONFIG_SYS_SPL_ARGS_ADDR);
41
42         return 0;
43 }
44 #endif
45
46 /*
47  * The main entry for SPI booting. It's necessary that SDRAM is already
48  * configured and available since this code loads the main U-Boot image
49  * from SPI into SDRAM and starts it from there.
50  */
51 void spl_spi_load_image(void)
52 {
53         struct spi_flash *flash;
54         struct image_header *header;
55
56         /*
57          * Load U-Boot image from SPI flash into RAM
58          */
59
60         flash = spi_flash_probe(CONFIG_SF_DEFAULT_BUS,
61                                 CONFIG_SF_DEFAULT_CS,
62                                 CONFIG_SF_DEFAULT_SPEED,
63                                 CONFIG_SF_DEFAULT_MODE);
64         if (!flash) {
65                 puts("SPI probe failed.\n");
66                 hang();
67         }
68
69         /* use CONFIG_SYS_TEXT_BASE as temporary storage area */
70         header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
71
72 #ifdef CONFIG_SPL_OS_BOOT
73         if (spl_start_uboot() || spi_load_image_os(flash, header))
74 #endif
75         {
76                 /* Load u-boot, mkimage header is 64 bytes. */
77                 spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
78                                (void *)header);
79                 spl_parse_image_header(header);
80                 spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
81                                spl_image.size, (void *)spl_image.load_addr);
82         }
83 }