73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
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* (C) Copyright 2014
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* Texas Instruments, <www.ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _TI_COMMON_SYS_PROTO_H_
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#define _TI_COMMON_SYS_PROTO_H_
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_OMAP_COMMON
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#define TI_ARMV7_DRAM_ADDR_SPACE_START 0x80000000
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#define TI_ARMV7_DRAM_ADDR_SPACE_END 0xFFFFFFFF
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#define OMAP_INIT_CONTEXT_SPL 0
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#define OMAP_INIT_CONTEXT_UBOOT_FROM_NOR 1
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#define OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL 2
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#define OMAP_INIT_CONTEXT_UBOOT_AFTER_CH 3
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static inline u32 running_from_sdram(void)
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{
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u32 pc;
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asm volatile ("mov %0, pc" : "=r" (pc));
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return ((pc >= TI_ARMV7_DRAM_ADDR_SPACE_START) &&
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(pc < TI_ARMV7_DRAM_ADDR_SPACE_END));
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}
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static inline u8 uboot_loaded_by_spl(void)
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{
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/*
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* u-boot can be running from sdram either because of configuration
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* Header or by SPL. If because of CH, then the romcode sets the
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* CHSETTINGS executed bit to true in the boot parameter structure that
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* it passes to the bootloader.This parameter is stored in the ch_flags
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* variable by both SPL and u-boot.Check out for CHSETTINGS, which is a
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* mandatory section if CH is present.
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*/
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if ((gd->arch.omap_boot_params.ch_flags) & (CH_FLAGS_CHSETTINGS))
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return 0;
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else
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return running_from_sdram();
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}
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/*
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* The basic hardware init of OMAP(s_init()) can happen in 4
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* different contexts:
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* 1. SPL running from SRAM
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* 2. U-Boot running from FLASH
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* 3. Non-XIP U-Boot loaded to SDRAM by SPL
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* 4. Non-XIP U-Boot loaded to SDRAM by ROM code using the
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* Configuration Header feature
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*
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* This function finds this context.
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* Defining as inline may help in compiling out unused functions in SPL
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*/
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static inline u32 omap_hw_init_context(void)
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{
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#ifdef CONFIG_SPL_BUILD
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return OMAP_INIT_CONTEXT_SPL;
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#else
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if (uboot_loaded_by_spl())
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return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL;
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else if (running_from_sdram())
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return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH;
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else
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return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR;
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#endif
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}
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#endif
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#endif
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