1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * (C) Copyright 2014 4 * Texas Instruments, <www.ti.com> 5 */ 6#ifndef _TI_COMMON_SYS_PROTO_H_ 7#define _TI_COMMON_SYS_PROTO_H_ 8 9#include <asm/global_data.h> 10 11DECLARE_GLOBAL_DATA_PTR; 12 13#ifdef CONFIG_ARCH_OMAP2PLUS 14#define TI_ARMV7_DRAM_ADDR_SPACE_START 0x80000000 15#define TI_ARMV7_DRAM_ADDR_SPACE_END 0xFFFFFFFF 16 17#define OMAP_INIT_CONTEXT_SPL 0 18#define OMAP_INIT_CONTEXT_UBOOT_FROM_NOR 1 19#define OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL 2 20#define OMAP_INIT_CONTEXT_UBOOT_AFTER_CH 3 21 22static inline u32 running_from_sdram(void) 23{ 24 u32 pc; 25 asm volatile ("mov %0, pc" : "=r" (pc)); 26 return ((pc >= TI_ARMV7_DRAM_ADDR_SPACE_START) && 27 (pc < TI_ARMV7_DRAM_ADDR_SPACE_END)); 28} 29 30static inline u8 uboot_loaded_by_spl(void) 31{ 32 /* 33 * u-boot can be running from sdram either because of configuration 34 * Header or by SPL. If because of CH, then the romcode sets the 35 * CHSETTINGS executed bit to true in the boot parameter structure that 36 * it passes to the bootloader.This parameter is stored in the ch_flags 37 * variable by both SPL and u-boot.Check out for CHSETTINGS, which is a 38 * mandatory section if CH is present. 39 */ 40 if (gd->arch.omap_ch_flags & CH_FLAGS_CHSETTINGS) 41 return 0; 42 else 43 return running_from_sdram(); 44} 45 46/* 47 * The basic hardware init of OMAP(s_init()) can happen in 4 48 * different contexts: 49 * 1. SPL running from SRAM 50 * 2. U-Boot running from FLASH 51 * 3. Non-XIP U-Boot loaded to SDRAM by SPL 52 * 4. Non-XIP U-Boot loaded to SDRAM by ROM code using the 53 * Configuration Header feature 54 * 55 * This function finds this context. 56 * Defining as inline may help in compiling out unused functions in SPL 57 */ 58static inline u32 omap_hw_init_context(void) 59{ 60#ifdef CONFIG_SPL_BUILD 61 return OMAP_INIT_CONTEXT_SPL; 62#else 63 if (uboot_loaded_by_spl()) 64 return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL; 65 else if (running_from_sdram()) 66 return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH; 67 else 68 return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR; 69#endif 70} 71#endif 72 73#endif 74