diff options
Diffstat (limited to 'arch/arm/mach-s5pv310/hotplug.c')
-rw-r--r-- | arch/arm/mach-s5pv310/hotplug.c | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/arch/arm/mach-s5pv310/hotplug.c b/arch/arm/mach-s5pv310/hotplug.c deleted file mode 100644 index 03652c3605f6..000000000000 --- a/arch/arm/mach-s5pv310/hotplug.c +++ /dev/null @@ -1,144 +0,0 @@ -/* linux arch/arm/mach-s5pv310/hotplug.c - * - * Cloned from linux/arch/arm/mach-realview/hotplug.c - * - * Copyright (C) 2002 ARM Ltd. - * All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. -*/ - -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/smp.h> -#include <linux/completion.h> - -#include <asm/cacheflush.h> - -extern volatile int pen_release; - -static DECLARE_COMPLETION(cpu_killed); - -static inline void cpu_enter_lowpower(void) -{ - unsigned int v; - - flush_cache_all(); - asm volatile( - " mcr p15, 0, %1, c7, c5, 0\n" - " mcr p15, 0, %1, c7, c10, 4\n" - /* - * Turn off coherency - */ - " mrc p15, 0, %0, c1, c0, 1\n" - " bic %0, %0, #0x20\n" - " mcr p15, 0, %0, c1, c0, 1\n" - " mrc p15, 0, %0, c1, c0, 0\n" - " bic %0, %0, #0x04\n" - " mcr p15, 0, %0, c1, c0, 0\n" - : "=&r" (v) - : "r" (0) - : "cc"); -} - -static inline void cpu_leave_lowpower(void) -{ - unsigned int v; - - asm volatile( - "mrc p15, 0, %0, c1, c0, 0\n" - " orr %0, %0, #0x04\n" - " mcr p15, 0, %0, c1, c0, 0\n" - " mrc p15, 0, %0, c1, c0, 1\n" - " orr %0, %0, #0x20\n" - " mcr p15, 0, %0, c1, c0, 1\n" - : "=&r" (v) - : - : "cc"); -} - -static inline void platform_do_lowpower(unsigned int cpu) -{ - /* - * there is no power-control hardware on this platform, so all - * we can do is put the core into WFI; this is safe as the calling - * code will have already disabled interrupts - */ - for (;;) { - /* - * here's the WFI - */ - asm(".word 0xe320f003\n" - : - : - : "memory", "cc"); - - if (pen_release == cpu) { - /* - * OK, proper wakeup, we're done - */ - break; - } - - /* - * getting here, means that we have come out of WFI without - * having been woken up - this shouldn't happen - * - * The trouble is, letting people know about this is not really - * possible, since we are currently running incoherently, and - * therefore cannot safely call printk() or anything else - */ -#ifdef DEBUG - printk(KERN_WARN "CPU%u: spurious wakeup call\n", cpu); -#endif - } -} - -int platform_cpu_kill(unsigned int cpu) -{ - return wait_for_completion_timeout(&cpu_killed, 5000); -} - -/* - * platform-specific code to shutdown a CPU - * - * Called with IRQs disabled - */ -void platform_cpu_die(unsigned int cpu) -{ -#ifdef DEBUG - unsigned int this_cpu = hard_smp_processor_id(); - - if (cpu != this_cpu) { - printk(KERN_CRIT "Eek! platform_cpu_die running on %u, should be %u\n", - this_cpu, cpu); - BUG(); - } -#endif - - printk(KERN_NOTICE "CPU%u: shutdown\n", cpu); - complete(&cpu_killed); - - /* - * we're ready for shutdown now, so do it - */ - cpu_enter_lowpower(); - platform_do_lowpower(cpu); - - /* - * bring this CPU back into the world of cache - * coherency, and then restore interrupts - */ - cpu_leave_lowpower(); -} - -int platform_cpu_disable(unsigned int cpu) -{ - /* - * we don't allow CPU 0 to be shutdown (it is still too special - * e.g. clock tick interrupts) - */ - return cpu == 0 ? -EPERM : 0; -} |