1 | // SPDX-License-Identifier: GPL-2.0-or-later |
---|---|
2 | /* |
3 | * Copyright 2011 Freescale Semiconductor, Inc. |
4 | * Copyright 2011 Linaro Ltd. |
5 | */ |
6 | |
7 | #include <linux/errno.h> |
8 | #include <linux/jiffies.h> |
9 | #include <asm/cacheflush.h> |
10 | #include <asm/cp15.h> |
11 | #include <asm/proc-fns.h> |
12 | |
13 | #include "common.h" |
14 | #include "hardware.h" |
15 | |
16 | /* |
17 | * platform-specific code to shutdown a CPU |
18 | * |
19 | * Called with IRQs disabled |
20 | */ |
21 | void imx_cpu_die(unsigned int cpu) |
22 | { |
23 | v7_exit_coherency_flush(louis); |
24 | /* |
25 | * We use the cpu jumping argument register to sync with |
26 | * imx_cpu_kill() which is running on cpu0 and waiting for |
27 | * the register being cleared to kill the cpu. |
28 | */ |
29 | imx_set_cpu_arg(cpu, arg: ~0); |
30 | |
31 | while (1) |
32 | cpu_do_idle(); |
33 | } |
34 | |
35 | int imx_cpu_kill(unsigned int cpu) |
36 | { |
37 | unsigned long timeout = jiffies + msecs_to_jiffies(m: 50); |
38 | |
39 | while (imx_get_cpu_arg(cpu) == 0) |
40 | if (time_after(jiffies, timeout)) |
41 | return 0; |
42 | imx_enable_cpu(cpu, enable: false); |
43 | imx_set_cpu_arg(cpu, arg: 0); |
44 | if (cpu_is_imx7d()) |
45 | imx_gpcv2_set_core1_pdn_pup_by_software(pdn: true); |
46 | return 1; |
47 | } |
48 |