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-rw-r--r--arch/arm/plat-versatile/hotplug.c102
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);
-}