| 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 |