Merge tag 'amlogic-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic into next/soc

Pull "Amlogic SoC updates for v4.15" from Kevin Hilman:

- add SMP support to Meson8/8b

* tag 'amlogic-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic:
  ARM: meson: enable MESON_IRQ_GPIO in Kconfig for meson8b
  ARM: meson: Add SMP bringup code for Meson8 and Meson8b
  ARM: smp_scu: allow the platform code to read the SCU CPU status
  ARM: smp_scu: add a helper for powering on a specific CPU
  dt-bindings: Amlogic: Add Meson8 and Meson8b SMP related documentation

1 files changed, 37 insertions, 6 deletions

diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c
index 72f9241ad5db..c6b33074c393 100644
--- a/arch/arm/kernel/smp_scu.c
+++ b/arch/arm/kernel/smp_scu.c
@@ -21,6 +21,7 @@
 #define SCU_STANDBY_ENABLE	(1 << 5)
 #define SCU_CONFIG		0x04
 #define SCU_CPU_STATUS		0x08
+#define SCU_CPU_STATUS_MASK	GENMASK(1, 0)
 #define SCU_INVALIDATE		0x0c
 #define SCU_FPGA_REVISION	0x10
 
@@ -72,6 +73,24 @@ void scu_enable(void __iomem *scu_base)
 }
 #endif
 
+static int scu_set_power_mode_internal(void __iomem *scu_base,
+				       unsigned int logical_cpu,
+				       unsigned int mode)
+{
+	unsigned int val;
+	int cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(logical_cpu), 0);
+
+	if (mode > 3 || mode == 1 || cpu > 3)
+		return -EINVAL;
+
+	val = readb_relaxed(scu_base + SCU_CPU_STATUS + cpu);
+	val &= ~SCU_CPU_STATUS_MASK;
+	val |= mode;
+	writeb_relaxed(val, scu_base + SCU_CPU_STATUS + cpu);
+
+	return 0;
+}
+
 /*
  * Set the executing CPUs power mode as defined.  This will be in
  * preparation for it executing a WFI instruction.
@@ -82,15 +101,27 @@ void scu_enable(void __iomem *scu_base)
  */
 int scu_power_mode(void __iomem *scu_base, unsigned int mode)
 {
+	return scu_set_power_mode_internal(scu_base, smp_processor_id(), mode);
+}
+
+/*
+ * Set the given (logical) CPU's power mode to SCU_PM_NORMAL.
+ */
+int scu_cpu_power_enable(void __iomem *scu_base, unsigned int cpu)
+{
+	return scu_set_power_mode_internal(scu_base, cpu, SCU_PM_NORMAL);
+}
+
+int scu_get_cpu_power_mode(void __iomem *scu_base, unsigned int logical_cpu)
+{
 	unsigned int val;
-	int cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(smp_processor_id()), 0);
+	int cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(logical_cpu), 0);
 
-	if (mode > 3 || mode == 1 || cpu > 3)
+	if (cpu > 3)
 		return -EINVAL;
 
-	val = readb_relaxed(scu_base + SCU_CPU_STATUS + cpu) & ~0x03;
-	val |= mode;
-	writeb_relaxed(val, scu_base + SCU_CPU_STATUS + cpu);
+	val = readb_relaxed(scu_base + SCU_CPU_STATUS + cpu);
+	val &= SCU_CPU_STATUS_MASK;
 
-	return 0;
+	return val;
 }