SPDX: Convert all of our single license tags to Linux Kernel style
[oweals/u-boot.git] / arch / arm / include / asm / ti-common / sys_proto.h
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