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 11 DECLARE_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 running_from_sdram(void)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 uboot_loaded_by_spl(void)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 */ omap_hw_init_context(void)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