diff options
Diffstat (limited to 'arch/arm/plat-versatile/hotplug.c')
-rw-r--r-- | arch/arm/plat-versatile/hotplug.c | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/arch/arm/plat-versatile/hotplug.c b/arch/arm/plat-versatile/hotplug.c deleted file mode 100644 index 2e9dca38bec0..000000000000 --- a/arch/arm/plat-versatile/hotplug.c +++ /dev/null @@ -1,102 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2002 ARM Ltd. - * All Rights Reserved - * - * This hotplug implementation is _specific_ to the situation found on - * ARM development platforms where there is _no_ possibility of actually - * taking a CPU offline, resetting it, or otherwise. Real platforms must - * NOT copy this code. - */ -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/smp.h> - -#include <asm/smp_plat.h> -#include <asm/cp15.h> - -#include <plat/platsmp.h> - -static inline void versatile_immitation_enter_lowpower(unsigned int actrl_mask) -{ - unsigned int v; - - 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, %3\n" - " mcr p15, 0, %0, c1, c0, 1\n" - " mrc p15, 0, %0, c1, c0, 0\n" - " bic %0, %0, %2\n" - " mcr p15, 0, %0, c1, c0, 0\n" - : "=&r" (v) - : "r" (0), "Ir" (CR_C), "Ir" (actrl_mask) - : "cc"); -} - -static inline void versatile_immitation_leave_lowpower(unsigned int actrl_mask) -{ - unsigned int v; - - asm volatile( - "mrc p15, 0, %0, c1, c0, 0\n" - " orr %0, %0, %1\n" - " mcr p15, 0, %0, c1, c0, 0\n" - " mrc p15, 0, %0, c1, c0, 1\n" - " orr %0, %0, %2\n" - " mcr p15, 0, %0, c1, c0, 1\n" - : "=&r" (v) - : "Ir" (CR_C), "Ir" (actrl_mask) - : "cc"); -} - -static inline void versatile_immitation_do_lowpower(unsigned int cpu, int *spurious) -{ - /* - * 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. - * - * This code should not be used outside Versatile platforms. - */ - for (;;) { - wfi(); - - if (versatile_cpu_release == cpu_logical_map(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 - * - * Just note it happening - when we're woken, we can report - * its occurrence. - */ - (*spurious)++; - } -} - -/* - * platform-specific code to shutdown a CPU. - * This code supports immitation-style CPU hotplug for Versatile/Realview/ - * Versatile Express platforms that are unable to do real CPU hotplug. - */ -void versatile_immitation_cpu_die(unsigned int cpu, unsigned int actrl_mask) -{ - int spurious = 0; - - versatile_immitation_enter_lowpower(actrl_mask); - versatile_immitation_do_lowpower(cpu, &spurious); - versatile_immitation_leave_lowpower(actrl_mask); - - if (spurious) - pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious); -} |