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, ~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(50);
38
39 while (imx_get_cpu_arg(cpu) == 0)
40 if (time_after(jiffies, timeout))
41 return 0;
42 imx_enable_cpu(cpu, false);
43 imx_set_cpu_arg(cpu, 0);
44 if (cpu_is_imx7d())
45 imx_gpcv2_set_core1_pdn_pup_by_software(true);
46 return 1;
47 }
48
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