1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * (C) Copyright 2014 3*4882a593Smuzhiyun * Texas Instruments, <www.ti.com> 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun #ifndef _TI_COMMON_SYS_PROTO_H_ 8*4882a593Smuzhiyun #define _TI_COMMON_SYS_PROTO_H_ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR; 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #ifdef CONFIG_ARCH_OMAP2PLUS 13*4882a593Smuzhiyun #define TI_ARMV7_DRAM_ADDR_SPACE_START 0x80000000 14*4882a593Smuzhiyun #define TI_ARMV7_DRAM_ADDR_SPACE_END 0xFFFFFFFF 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #define OMAP_INIT_CONTEXT_SPL 0 17*4882a593Smuzhiyun #define OMAP_INIT_CONTEXT_UBOOT_FROM_NOR 1 18*4882a593Smuzhiyun #define OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL 2 19*4882a593Smuzhiyun #define OMAP_INIT_CONTEXT_UBOOT_AFTER_CH 3 20*4882a593Smuzhiyun running_from_sdram(void)21*4882a593Smuzhiyunstatic inline u32 running_from_sdram(void) 22*4882a593Smuzhiyun { 23*4882a593Smuzhiyun u32 pc; 24*4882a593Smuzhiyun asm volatile ("mov %0, pc" : "=r" (pc)); 25*4882a593Smuzhiyun return ((pc >= TI_ARMV7_DRAM_ADDR_SPACE_START) && 26*4882a593Smuzhiyun (pc < TI_ARMV7_DRAM_ADDR_SPACE_END)); 27*4882a593Smuzhiyun } 28*4882a593Smuzhiyun uboot_loaded_by_spl(void)29*4882a593Smuzhiyunstatic inline u8 uboot_loaded_by_spl(void) 30*4882a593Smuzhiyun { 31*4882a593Smuzhiyun /* 32*4882a593Smuzhiyun * u-boot can be running from sdram either because of configuration 33*4882a593Smuzhiyun * Header or by SPL. If because of CH, then the romcode sets the 34*4882a593Smuzhiyun * CHSETTINGS executed bit to true in the boot parameter structure that 35*4882a593Smuzhiyun * it passes to the bootloader.This parameter is stored in the ch_flags 36*4882a593Smuzhiyun * variable by both SPL and u-boot.Check out for CHSETTINGS, which is a 37*4882a593Smuzhiyun * mandatory section if CH is present. 38*4882a593Smuzhiyun */ 39*4882a593Smuzhiyun if (gd->arch.omap_ch_flags & CH_FLAGS_CHSETTINGS) 40*4882a593Smuzhiyun return 0; 41*4882a593Smuzhiyun else 42*4882a593Smuzhiyun return running_from_sdram(); 43*4882a593Smuzhiyun } 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun /* 46*4882a593Smuzhiyun * The basic hardware init of OMAP(s_init()) can happen in 4 47*4882a593Smuzhiyun * different contexts: 48*4882a593Smuzhiyun * 1. SPL running from SRAM 49*4882a593Smuzhiyun * 2. U-Boot running from FLASH 50*4882a593Smuzhiyun * 3. Non-XIP U-Boot loaded to SDRAM by SPL 51*4882a593Smuzhiyun * 4. Non-XIP U-Boot loaded to SDRAM by ROM code using the 52*4882a593Smuzhiyun * Configuration Header feature 53*4882a593Smuzhiyun * 54*4882a593Smuzhiyun * This function finds this context. 55*4882a593Smuzhiyun * Defining as inline may help in compiling out unused functions in SPL 56*4882a593Smuzhiyun */ omap_hw_init_context(void)57*4882a593Smuzhiyunstatic inline u32 omap_hw_init_context(void) 58*4882a593Smuzhiyun { 59*4882a593Smuzhiyun #ifdef CONFIG_SPL_BUILD 60*4882a593Smuzhiyun return OMAP_INIT_CONTEXT_SPL; 61*4882a593Smuzhiyun #else 62*4882a593Smuzhiyun if (uboot_loaded_by_spl()) 63*4882a593Smuzhiyun return OMAP_INIT_CONTEXT_UBOOT_AFTER_SPL; 64*4882a593Smuzhiyun else if (running_from_sdram()) 65*4882a593Smuzhiyun return OMAP_INIT_CONTEXT_UBOOT_AFTER_CH; 66*4882a593Smuzhiyun else 67*4882a593Smuzhiyun return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR; 68*4882a593Smuzhiyun #endif 69*4882a593Smuzhiyun } 70*4882a593Smuzhiyun #endif 71*4882a593Smuzhiyun 72*4882a593Smuzhiyun #endif 73