mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 10:46:15 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/**
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* Copyright (c) 2017 Google, Inc
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*/
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#include <common.h>
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#include <asm/arch/bootrom.h>
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#include <asm/arch/boot_mode.h>
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#include <asm/io.h>
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#include <asm/setjmp.h>
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#include <asm/system.h>
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/*
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* Force the jmp_buf to the data-section, as .bss will not be valid
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* when save_boot_params is invoked.
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*/
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static jmp_buf brom_ctx __section(".data");
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static void _back_to_bootrom(enum rockchip_bootrom_cmd brom_cmd)
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{
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longjmp(brom_ctx, brom_cmd);
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}
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void back_to_bootrom(enum rockchip_bootrom_cmd brom_cmd)
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{
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#if CONFIG_IS_ENABLED(LIBCOMMON_SUPPORT)
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puts("Returning to boot ROM...\n");
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#endif
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_back_to_bootrom(brom_cmd);
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}
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/*
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* we back to bootrom download mode if get a
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* BOOT_BROM_DOWNLOAD flag in boot mode register
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*
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* note: the boot mode register is configured by
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* application(next stage bootloader, kernel, etc),
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* and the bootrom never check this register, so we need
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* to check it and back to bootrom at very early bootstage(before
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* some basic configurations(such as interrupts) been
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* changed by TPL/SPL, as the bootrom download operation
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* relys on many default settings(such as interrupts) by
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* it's self.
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*/
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static bool check_back_to_brom_dnl_flag(void)
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{
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u32 boot_mode;
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if (CONFIG_ROCKCHIP_BOOT_MODE_REG) {
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boot_mode = readl(CONFIG_ROCKCHIP_BOOT_MODE_REG);
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if (boot_mode == BOOT_BROM_DOWNLOAD) {
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writel(0, CONFIG_ROCKCHIP_BOOT_MODE_REG);
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return true;
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}
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}
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return false;
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}
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/*
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* All Rockchip BROM implementations enter with a valid stack-pointer,
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* so this can safely be implemented in C (providing a single
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* implementation both for ARMv7 and AArch64).
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*/
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int save_boot_params(void)
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{
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int ret = setjmp(brom_ctx);
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switch (ret) {
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case 0:
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if (check_back_to_brom_dnl_flag())
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_back_to_bootrom(BROM_BOOT_ENTER_DNL);
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/*
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* This is the initial pass through this function
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* (i.e. saving the context), setjmp just setup up the
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* brom_ctx: transfer back into the startup-code at
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* 'save_boot_params_ret' and let the compiler know
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* that this will not return.
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*/
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save_boot_params_ret();
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while (true)
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/* does not return */;
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break;
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case BROM_BOOT_NEXTSTAGE:
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/*
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* To instruct the BROM to boot the next stage, we
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* need to return 0 to it: i.e. we need to rewrite
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* the return code once more.
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*/
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ret = 0;
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break;
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case BROM_BOOT_ENTER_DNL:
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/*
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* A non-zero return value will instruct the BROM enter
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* download mode.
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*/
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ret = 1;
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break;
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default:
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#if CONFIG_IS_ENABLED(LIBCOMMON_SUPPORT)
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puts("FATAL: unexpected command to back_to_bootrom()\n");
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#endif
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hang();
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};
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return ret;
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}
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