arm64: cpuidle: Move ACPI specific code into drivers/acpi/arm64/

The ACPI cpuidle LPI FFH code can be moved out of arm64 arch code as
it just uses SMCCC. Move all the ACPI cpuidle LPI FFH code into
drivers/acpi/arm64/cpuidle.c

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Hanjun Guo <guohanjun@huawei.com>
Link: https://lore.kernel.org/r/20240605131458.3341095-3-sudeep.holla@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

2 files changed, 0 insertions, 75 deletions

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 763824963ed1..2b112f3b7510 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -46,7 +46,6 @@ obj-$(CONFIG_PERF_EVENTS)		+= perf_regs.o perf_callchain.o
 obj-$(CONFIG_HARDLOCKUP_DETECTOR_PERF)	+= watchdog_hld.o
 obj-$(CONFIG_HAVE_HW_BREAKPOINT)	+= hw_breakpoint.o
 obj-$(CONFIG_CPU_PM)			+= sleep.o suspend.o
-obj-$(CONFIG_CPU_IDLE)			+= cpuidle.o
 obj-$(CONFIG_JUMP_LABEL)		+= jump_label.o
 obj-$(CONFIG_KGDB)			+= kgdb.o
 obj-$(CONFIG_EFI)			+= efi.o efi-rt-wrapper.o
diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c
deleted file mode 100644
index f372295207fb..000000000000
--- a/arch/arm64/kernel/cpuidle.c
+++ /dev/null
@@ -1,74 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * ARM64 CPU idle arch support
- *
- * Copyright (C) 2014 ARM Ltd.
- * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
- */
-
-#include <linux/acpi.h>
-#include <linux/cpuidle.h>
-#include <linux/cpu_pm.h>
-#include <linux/psci.h>
-
-#ifdef CONFIG_ACPI_PROCESSOR_IDLE
-
-#include <acpi/processor.h>
-
-#define ARM64_LPI_IS_RETENTION_STATE(arch_flags) (!(arch_flags))
-
-static int psci_acpi_cpu_init_idle(unsigned int cpu)
-{
-	int i, count;
-	struct acpi_lpi_state *lpi;
-	struct acpi_processor *pr = per_cpu(processors, cpu);
-
-	if (unlikely(!pr || !pr->flags.has_lpi))
-		return -EINVAL;
-
-	/*
-	 * If the PSCI cpu_suspend function hook has not been initialized
-	 * idle states must not be enabled, so bail out
-	 */
-	if (!psci_ops.cpu_suspend)
-		return -EOPNOTSUPP;
-
-	count = pr->power.count - 1;
-	if (count <= 0)
-		return -ENODEV;
-
-	for (i = 0; i < count; i++) {
-		u32 state;
-
-		lpi = &pr->power.lpi_states[i + 1];
-		/*
-		 * Only bits[31:0] represent a PSCI power_state while
-		 * bits[63:32] must be 0x0 as per ARM ACPI FFH Specification
-		 */
-		state = lpi->address;
-		if (!psci_power_state_is_valid(state)) {
-			pr_warn("Invalid PSCI power state %#x\n", state);
-			return -EINVAL;
-		}
-	}
-
-	return 0;
-}
-
-int acpi_processor_ffh_lpi_probe(unsigned int cpu)
-{
-	return psci_acpi_cpu_init_idle(cpu);
-}
-
-__cpuidle int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
-{
-	u32 state = lpi->address;
-
-	if (ARM64_LPI_IS_RETENTION_STATE(lpi->arch_flags))
-		return CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM_RCU(psci_cpu_suspend_enter,
-						lpi->index, state);
-	else
-		return CPU_PM_CPU_IDLE_ENTER_PARAM_RCU(psci_cpu_suspend_enter,
-					     lpi->index, state);
-}
-#endif