1/*
2 * Copyright (c) 2014 Wind River Systems, Inc.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7/**
8 * @file
9 * @brief CPU power management
10 *
11 * CPU power management routines.
12 */
13
14#include <kernel_structs.h>
15#include <offsets_short.h>
16#include <toolchain.h>
17#include <linker/sections.h>
18#include <arch/cpu.h>
19#include <arch/arc/asm-compat/assembler.h>
20
21GTEXT(arch_cpu_idle)
22GTEXT(arch_cpu_atomic_idle)
23GDATA(z_arc_cpu_sleep_mode)
24
25SECTION_VAR(BSS, z_arc_cpu_sleep_mode)
26	.align 4
27	.word 0
28
29/*
30 * @brief Put the CPU in low-power mode
31 *
32 * This function always exits with interrupts unlocked.
33 *
34 * void nanCpuIdle(void)
35 */
36
37SECTION_FUNC(TEXT, arch_cpu_idle)
38
39#ifdef CONFIG_TRACING
40	PUSHR blink
41	jl    sys_trace_idle
42	POPR blink
43#endif
44
45	/* z_arc_cpu_sleep_mode is 32 bit despite of platform bittnes */
46	ld r1, [z_arc_cpu_sleep_mode]
47	or r1, r1, (1 << 4) /* set IRQ-enabled bit */
48	sleep r1
49	j_s [blink]
50	nop
51
52/*
53 * @brief Put the CPU in low-power mode, entered with IRQs locked
54 *
55 * This function exits with interrupts restored to <key>.
56 *
57 * void arch_cpu_atomic_idle(unsigned int key)
58 */
59SECTION_FUNC(TEXT, arch_cpu_atomic_idle)
60
61#ifdef CONFIG_TRACING
62	PUSHR blink
63	jl    sys_trace_idle
64	POPR blink
65#endif
66
67	/* z_arc_cpu_sleep_mode is 32 bit despite of platform bittnes */
68	ld r1, [z_arc_cpu_sleep_mode]
69	or r1, r1, (1 << 4) /* set IRQ-enabled bit */
70	sleep r1
71	j_s.d [blink]
72	seti r0
73