1 /* SPDX-License-Identifier: GPL-2.0+ */
4 * Texas Instruments, <www.ti.com>
6 #ifndef _TI_COMMON_SYS_PROTO_H_
7 #define _TI_COMMON_SYS_PROTO_H_
9 DECLARE_GLOBAL_DATA_PTR;
11 #ifdef CONFIG_ARCH_OMAP2PLUS
12 #define TI_ARMV7_DRAM_ADDR_SPACE_START 0x80000000
13 #define TI_ARMV7_DRAM_ADDR_SPACE_END 0xFFFFFFFF
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
20 static inline u32 running_from_sdram(void)
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));
28 static inline u8 uboot_loaded_by_spl(void)
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.
38 if (gd->arch.omap_ch_flags & CH_FLAGS_CHSETTINGS)
41 return running_from_sdram();
45 * The basic hardware init of OMAP(s_init()) can happen in 4
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
53 * This function finds this context.
54 * Defining as inline may help in compiling out unused functions in SPL
56 static inline u32 omap_hw_init_context(void)
58 #ifdef CONFIG_SPL_BUILD
59 return OMAP_INIT_CONTEXT_SPL;
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;
66 return OMAP_INIT_CONTEXT_UBOOT_FROM_NOR;