ARM: migrate to common PSCI client code

Now that the common PSCI client code has been factored out to
drivers/firmware, and made safe for 32-bit use, move the 32-bit ARM code
over to it. This results in a moderate reduction of duplicated lines,
and will prevent further duplication as the PSCI client code is updated
for PSCI 1.0 and beyond.

The two legacy platform users of the PSCI invocation code are updated to
account for interface changes. In both cases the power state parameter
(which is constant) is now generated using macros, so that the
pack/unpack logic can be killed in preparation for PSCI 1.0 power state
changes.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 22 insertions, 7 deletions

diff --git a/arch/arm/kernel/psci_smp.c b/arch/arm/kernel/psci_smp.c
index 244aaddfbfda..61c04b02faeb 100644
--- a/arch/arm/kernel/psci_smp.c
+++ b/arch/arm/kernel/psci_smp.c
@@ -17,6 +17,8 @@
 #include <linux/smp.h>
 #include <linux/of.h>
 #include <linux/delay.h>
+#include <linux/psci.h>
+
 #include <uapi/linux/psci.h>
 
 #include <asm/psci.h>
@@ -56,17 +58,29 @@ static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
+int psci_cpu_disable(unsigned int cpu)
+{
+	/* Fail early if we don't have CPU_OFF support */
+	if (!psci_ops.cpu_off)
+		return -EOPNOTSUPP;
+
+	/* Trusted OS will deny CPU_OFF */
+	if (psci_tos_resident_on(cpu))
+		return -EPERM;
+
+	return 0;
+}
+
 void __ref psci_cpu_die(unsigned int cpu)
 {
-       const struct psci_power_state ps = {
-               .type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
-       };
+	u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
+		    PSCI_0_2_POWER_STATE_TYPE_SHIFT;
 
-       if (psci_ops.cpu_off)
-               psci_ops.cpu_off(ps);
+	if (psci_ops.cpu_off)
+		psci_ops.cpu_off(state);
 
-       /* We should never return */
-       panic("psci: cpu %d failed to shutdown\n", cpu);
+	/* We should never return */
+	panic("psci: cpu %d failed to shutdown\n", cpu);
 }
 
 int __ref psci_cpu_kill(unsigned int cpu)
@@ -109,6 +123,7 @@ bool __init psci_smp_available(void)
 struct smp_operations __initdata psci_smp_ops = {
 	.smp_boot_secondary	= psci_boot_secondary,
 #ifdef CONFIG_HOTPLUG_CPU
+	.cpu_disable		= psci_cpu_disable,
 	.cpu_die		= psci_cpu_die,
 	.cpu_kill		= psci_cpu_kill,
 #endif