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