mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-07 13:44:29 +00:00
db41d65a97
At present panic() is in the vsprintf.h header file. That does not seem like an obvious choice for hang(), even though it relates to panic(). So let's put hang() in its own header. Signed-off-by: Simon Glass <sjg@chromium.org> [trini: Migrate a few more files] 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 <hang.h>
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#include <asm/arch-rockchip/bootrom.h>
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#include <asm/arch-rockchip/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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* relies on many default settings(such as interrupts) by
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* itself.
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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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