Merge tag 'amlogic-soc' of...

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

Documentation/devicetree/bindings/arm/amlogic/pmu.txt

+Amlogic Meson8 and Meson8b power-management-unit:
+-------------------------------------------------
+
+The pmu is used to turn off and on different power domains of the SoCs
+This includes the power to the CPU cores.
+
+Required node properties:
+- compatible value : depending on the SoC this should be one of:
+			"amlogic,meson8-pmu"
+			"amlogic,meson8b-pmu"
+- reg : physical base address and the size of the registers window
+
+Example:
+
+	pmu@c81000e4 {
+		compatible = "amlogic,meson8b-pmu", "syscon";
+		reg = <0xc81000e0 0x18>;
+	};

Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt

+Amlogic Meson8 and Meson8b SRAM for smp bringup:
+------------------------------------------------
+
+Amlogic's SMP-capable SoCs use part of the sram for the bringup of the cores.
+Once the core gets powered up it executes the code that is residing at a
+specific location.
+
+Therefore a reserved section sub-node has to be added to the mmio-sram
+declaration.
+
+Required sub-node properties:
+- compatible : depending on the SoC this should be one of:
+		"amlogic,meson8-smp-sram"
+		"amlogic,meson8b-smp-sram"
+
+The rest of the properties should follow the generic mmio-sram discription
+found in ../../misc/sram.txt
+
+Example:
+
+	sram: sram@d9000000 {
+		compatible = "mmio-sram";
+		reg = <0xd9000000 0x20000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0xd9000000 0x20000>;
+
+		smp-sram@1ff80 {
+			compatible = "amlogic,meson8b-smp-sram";
+			reg = <0x1ff80 0x8>;
+		};
+	};

Documentation/devicetree/bindings/arm/cpus.txt

@@ -197,6 +197,8 @@ described below.
 			    "actions,s500-smp"
 			    "allwinner,sun6i-a31"
 			    "allwinner,sun8i-a23"
+			    "amlogic,meson8-smp"
+			    "amlogic,meson8b-smp"
 			    "arm,realview-smp"
 			    "brcm,bcm11351-cpu-method"
 			    "brcm,bcm23550"

arch/arm/Makefile

@@ -147,6 +147,7 @@ textofs-$(CONFIG_SA1111) := 0x00208000
 endif
 textofs-$(CONFIG_ARCH_MSM8X60) := 0x00208000
 textofs-$(CONFIG_ARCH_MSM8960) := 0x00208000
+textofs-$(CONFIG_ARCH_MESON) := 0x00208000
 textofs-$(CONFIG_ARCH_AXXIA) := 0x00308000
 
 # Machine directory name.  This list is sorted alphanumerically

arch/arm/include/asm/smp_scu.h

@@ -27,6 +27,8 @@ static inline unsigned long scu_a9_get_base(void)
 #ifdef CONFIG_HAVE_ARM_SCU
 unsigned int scu_get_core_count(void __iomem *);
 int scu_power_mode(void __iomem *, unsigned int);
+int scu_cpu_power_enable(void __iomem *, unsigned int);
+int scu_get_cpu_power_mode(void __iomem *scu_base, unsigned int logical_cpu);
 #else
 static inline unsigned int scu_get_core_count(void __iomem *scu_base)
 {
@@ -36,6 +38,16 @@ static inline int scu_power_mode(void __iomem *scu_base, unsigned int mode)
 {
 	return -EINVAL;
 }
+static inline int scu_cpu_power_enable(void __iomem *scu_base,
+				       unsigned int mode)
+{
+	return -EINVAL;
+}
+static inline int scu_get_cpu_power_mode(void __iomem *scu_base,
+					 unsigned int logical_cpu)
+{
+	return -EINVAL;
+}
 #endif
 
 #if defined(CONFIG_SMP) && defined(CONFIG_HAVE_ARM_SCU)

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.
@@ -81,16 +100,28 @@ void scu_enable(void __iomem *scu_base)
  * flushed.  Interrupts must also have been disabled.
  */
 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;
 }

arch/arm/mach-meson/Kconfig

@@ -9,6 +9,7 @@ menuconfig ARCH_MESON
 	select PINCTRL_MESON
 	select COMMON_CLK
 	select COMMON_CLK_AMLOGIC
+	select HAVE_ARM_SCU if SMP
 
 if ARCH_MESON
 
@@ -28,5 +29,6 @@ config MACH_MESON8B
 	default ARCH_MESON
 	select MESON6_TIMER
 	select COMMON_CLK_MESON8B
+	select MESON_IRQ_GPIO
 
 endif

arch/arm/mach-meson/Makefile

 obj-$(CONFIG_ARCH_MESON) += meson.o
+obj-$(CONFIG_SMP) += platsmp.o