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