| /* |
| * CPU hotplug support for CSR Marco dual-core SMP SoCs |
| * |
| * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company. |
| * |
| * Licensed under GPLv2 or later. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/smp.h> |
| |
| #include <asm/smp_plat.h> |
| |
| static inline void platform_do_lowpower(unsigned int cpu) |
| { |
| /* we put the platform to just WFI */ |
| for (;;) { |
| __asm__ __volatile__("dsb\n\t" "wfi\n\t" |
| : : : "memory"); |
| if (pen_release == cpu_logical_map(cpu)) { |
| /* |
| * OK, proper wakeup, we're done |
| */ |
| break; |
| } |
| } |
| } |
| |
| /* |
| * platform-specific code to shutdown a CPU |
| * |
| * Called with IRQs disabled |
| */ |
| void sirfsoc_cpu_die(unsigned int cpu) |
| { |
| platform_do_lowpower(cpu); |
| } |