1/*
2 * A lowlevel_init function that sets up the stack to call a C function to
3 * perform further init.
4 *
5 * (C) Copyright 2010
6 * Texas Instruments, <www.ti.com>
7 *
8 * Author :
9 *	Aneesh V	<aneesh@ti.com>
10 *
11 * SPDX-License-Identifier:	GPL-2.0+
12 */
13
14#include <asm-offsets.h>
15#include <config.h>
16#include <linux/linkage.h>
17
18ENTRY(lowlevel_init)
19	/*
20	 * Setup a temporary stack. Global data is not available yet.
21	 */
22#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
23	ldr	sp, =CONFIG_SPL_STACK
24#else
25	ldr	sp, =CONFIG_SYS_INIT_SP_ADDR
26#endif
27	bic	sp, sp, #7 /* 8-byte alignment for ABI compliance */
28#ifdef CONFIG_SPL_DM
29	mov	r9, #0
30#else
31	/*
32	 * Set up global data for boards that still need it. This will be
33	 * removed soon.
34	 */
35#ifdef CONFIG_SPL_BUILD
36	ldr	r9, =gdata
37#else
38	sub	sp, sp, #GD_SIZE
39	bic	sp, sp, #7
40	mov	r9, sp
41#endif
42#endif
43	/*
44	 * Save the old lr(passed in ip) and the current lr to stack
45	 */
46	push	{ip, lr}
47
48	/*
49	 * Call the very early init function. This should do only the
50	 * absolute bare minimum to get started. It should not:
51	 *
52	 * - set up DRAM
53	 * - use global_data
54	 * - clear BSS
55	 * - try to start a console
56	 *
57	 * For boards with SPL this should be empty since SPL can do all of
58	 * this init in the SPL board_init_f() function which is called
59	 * immediately after this.
60	 */
61	bl	s_init
62	pop	{ip, pc}
63ENDPROC(lowlevel_init)
64