Merge tag 'irqchip-for-4.7' of...

Merge tag 'irqchip-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core

Pull irqchip updates for Linux 4.7 from Marc Zyngier

- Layerscape SCFG MSI controller support
- LPC32xx interrupt controller support
- RPi irqchip support on arm64
- GICv2 cleanup
- GICv2 and GICv3 bug fixes

Documentation/devicetree/bindings/interrupt-controller/fsl,ls-scfg-msi.txt

+* Freescale Layerscape SCFG PCIe MSI controller
+
+Required properties:
+
+- compatible: should be "fsl,<soc-name>-msi" to identify
+	      Layerscape PCIe MSI controller block such as:
+              "fsl,1s1021a-msi"
+              "fsl,1s1043a-msi"
+- msi-controller: indicates that this is a PCIe MSI controller node
+- reg: physical base address of the controller and length of memory mapped.
+- interrupts: an interrupt to the parent interrupt controller.
+
+Optional properties:
+- interrupt-parent: the phandle to the parent interrupt controller.
+
+This interrupt controller hardware is a second level interrupt controller that
+is hooked to a parent interrupt controller: e.g: ARM GIC for ARM-based
+platforms. If interrupt-parent is not provided, the default parent interrupt
+controller will be used.
+Each PCIe node needs to have property msi-parent that points to
+MSI controller node
+
+Examples:
+
+	msi1: msi-controller@1571000 {
+		compatible = "fsl,1s1043a-msi";
+		reg = <0x0 0x1571000 0x0 0x8>,
+		msi-controller;
+		interrupts = <0 116 0x4>;
+	};

arch/arm/Kconfig

@@ -531,6 +531,8 @@ config ARCH_LPC32XX
 	select COMMON_CLK
 	select CPU_ARM926T
 	select GENERIC_CLOCKEVENTS
+	select MULTI_IRQ_HANDLER
+	select SPARSE_IRQ
 	select USE_OF
 	help
 	  Support for the NXP LPC32XX family of processors

arch/arm/mach-lpc32xx/phy3250.c

@@ -206,7 +206,6 @@ static const char *const lpc32xx_dt_compat[] __initconst = {
 DT_MACHINE_START(LPC32XX_DT, "LPC32XX SoC (Flattened Device Tree)")
 	.atag_offset	= 0x100,
 	.map_io		= lpc32xx_map_io,
-	.init_irq	= lpc32xx_init_irq,
 	.init_machine	= lpc3250_machine_init,
 	.dt_compat	= lpc32xx_dt_compat,
 MACHINE_END

drivers/irqchip/Kconfig

@@ -246,5 +246,10 @@ config MVEBU_ODMI
 	bool
 	select GENERIC_MSI_IRQ_DOMAIN
 
+config LS_SCFG_MSI
+	def_bool y if SOC_LS1021A || ARCH_LAYERSCAPE
+	depends on PCI && PCI_MSI
+	select PCI_MSI_IRQ_DOMAIN
+
 config PARTITION_PERCPU
 	bool

drivers/irqchip/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_BCM2835)		+= irq-bcm2835.o
 obj-$(CONFIG_ARCH_BCM2835)		+= irq-bcm2836.o
 obj-$(CONFIG_ARCH_EXYNOS)		+= exynos-combiner.o
 obj-$(CONFIG_ARCH_HIP04)		+= irq-hip04.o
+obj-$(CONFIG_ARCH_LPC32XX)		+= irq-lpc32xx.o
 obj-$(CONFIG_ARCH_MMP)			+= irq-mmp.o
 obj-$(CONFIG_IRQ_MXS)			+= irq-mxs.o
 obj-$(CONFIG_ARCH_TEGRA)		+= irq-tegra.o
@@ -66,3 +67,4 @@ obj-$(CONFIG_INGENIC_IRQ)		+= irq-ingenic.o
 obj-$(CONFIG_IMX_GPCV2)			+= irq-imx-gpcv2.o
 obj-$(CONFIG_PIC32_EVIC)		+= irq-pic32-evic.o
 obj-$(CONFIG_MVEBU_ODMI)		+= irq-mvebu-odmi.o
+obj-$(CONFIG_LS_SCFG_MSI)		+= irq-ls-scfg-msi.o

drivers/irqchip/irq-bcm2836.c

@@ -195,7 +195,7 @@ static void bcm2836_arm_irqchip_send_ipi(const struct cpumask *mask,
 	 * Ensure that stores to normal memory are visible to the
 	 * other CPUs before issuing the IPI.
 	 */
-	dsb();
+	smp_wmb();
 
 	for_each_cpu(cpu, mask)	{
 		writel(1 << ipi, mailbox0_base + 16 * cpu);
@@ -223,6 +223,7 @@ static struct notifier_block bcm2836_arm_irqchip_cpu_notifier = {
 	.priority = 100,
 };
 
+#ifdef CONFIG_ARM
 int __init bcm2836_smp_boot_secondary(unsigned int cpu,
 				      struct task_struct *idle)
 {
@@ -238,7 +239,7 @@ int __init bcm2836_smp_boot_secondary(unsigned int cpu,
 static const struct smp_operations bcm2836_smp_ops __initconst = {
 	.smp_boot_secondary	= bcm2836_smp_boot_secondary,
 };
-
+#endif
 #endif
 
 static const struct irq_domain_ops bcm2836_arm_irqchip_intc_ops = {
@@ -252,12 +253,15 @@ bcm2836_arm_irqchip_smp_init(void)
 	/* Unmask IPIs to the boot CPU. */
 	bcm2836_arm_irqchip_cpu_notify(&bcm2836_arm_irqchip_cpu_notifier,
 				       CPU_STARTING,
-				       (void *)smp_processor_id());
+				       (void *)(uintptr_t)smp_processor_id());
 	register_cpu_notifier(&bcm2836_arm_irqchip_cpu_notifier);
 
 	set_smp_cross_call(bcm2836_arm_irqchip_send_ipi);
+
+#ifdef CONFIG_ARM
 	smp_set_ops(&bcm2836_smp_ops);
 #endif
+#endif
 }
 
 /*

drivers/irqchip/irq-crossbar.c

@@ -183,7 +183,7 @@ static int crossbar_domain_translate(struct irq_domain *d,
 			return -EINVAL;
 
 		*hwirq = fwspec->param[1];
-		*type = fwspec->param[2];
+		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 		return 0;
 	}
 

drivers/irqchip/irq-gic-common.c

@@ -50,14 +50,26 @@ int gic_configure_irq(unsigned int irq, unsigned int type,
 	else if (type & IRQ_TYPE_EDGE_BOTH)
 		val |= confmask;
 
+	/* If the current configuration is the same, then we are done */
+	if (val == oldval)
+		return 0;
+
 	/*
 	 * Write back the new configuration, and possibly re-enable
-	 * the interrupt. If we tried to write a new configuration and failed,
-	 * return an error.
+	 * the interrupt. If we fail to write a new configuration for
+	 * an SPI then WARN and return an error. If we fail to write the
+	 * configuration for a PPI this is most likely because the GIC
+	 * does not allow us to set the configuration or we are in a
+	 * non-secure mode, and hence it may not be catastrophic.
 	 */
 	writel_relaxed(val, base + GIC_DIST_CONFIG + confoff);
-	if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val && val != oldval)
+	if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val) {
+		if (WARN_ON(irq >= 32))
 			ret = -EINVAL;
+		else
+			pr_warn("GIC: PPI%d is secure or misconfigured\n",
+				irq - 16);
+	}
 
 	if (sync_access)
 		sync_access();

drivers/irqchip/irq-gic-v2m.c

@@ -49,6 +49,9 @@
 /* APM X-Gene with GICv2m MSI_IIDR register value */
 #define XGENE_GICV2M_MSI_IIDR		0x06000170
 
+/* Broadcom NS2 GICv2m MSI_IIDR register value */
+#define BCM_NS2_GICV2M_MSI_IIDR		0x0000013f
+
 /* List of flags for specific v2m implementation */
 #define GICV2M_NEEDS_SPI_OFFSET		0x00000001
 
@@ -62,6 +65,7 @@ struct v2m_data {
 	void __iomem *base;	/* GICv2m virt address */
 	u32 spi_start;		/* The SPI number that MSIs start */
 	u32 nr_spis;		/* The number of SPIs for MSIs */
+	u32 spi_offset;		/* offset to be subtracted from SPI number */
 	unsigned long *bm;	/* MSI vector bitmap */
 	u32 flags;		/* v2m flags for specific implementation */
 };
@@ -102,7 +106,7 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 	msg->data = data->hwirq;
 
 	if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
-		msg->data -= v2m->spi_start;
+		msg->data -= v2m->spi_offset;
 }
 
 static struct irq_chip gicv2m_irq_chip = {
@@ -340,9 +344,20 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
 	 * different from the standard GICv2m implementation where
 	 * the MSI data is the absolute value within the range from
 	 * spi_start to (spi_start + num_spis).
+	 *
+	 * Broadom NS2 GICv2m implementation has an erratum where the MSI data
+	 * is 'spi_number - 32'
 	 */
-	if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR)
+	switch (readl_relaxed(v2m->base + V2M_MSI_IIDR)) {
+	case XGENE_GICV2M_MSI_IIDR:
+		v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
+		v2m->spi_offset = v2m->spi_start;
+		break;
+	case BCM_NS2_GICV2M_MSI_IIDR:
 		v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
+		v2m->spi_offset = 32;
+		break;
+	}
 
 	v2m->bm = kzalloc(sizeof(long) * BITS_TO_LONGS(v2m->nr_spis),
 			  GFP_KERNEL);

drivers/irqchip/irq-gic-v3-its.c

@@ -54,6 +54,16 @@ struct its_collection {
 	u16			col_id;
 };
 
+/*
+ * The ITS_BASER structure - contains memory information and cached
+ * value of BASER register configuration.
+ */
+struct its_baser {
+	void		*base;
+	u64		val;
+	u32		order;
+};
+
 /*
  * The ITS structure - contains most of the infrastructure, with the
  * top-level MSI domain, the command queue, the collections, and the
@@ -66,14 +76,12 @@ struct its_node {
 	unsigned long		phys_base;
 	struct its_cmd_block	*cmd_base;
 	struct its_cmd_block	*cmd_write;
-	struct {
-		void		*base;
-		u32		order;
-	} tables[GITS_BASER_NR_REGS];
+	struct its_baser	tables[GITS_BASER_NR_REGS];
 	struct its_collection	*collections;
 	struct list_head	its_device_list;
 	u64			flags;
 	u32			ite_size;
+	u32			device_ids;
 };
 
 #define ITS_ITT_ALIGN		SZ_256
@@ -838,6 +846,8 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
 		ids	= GITS_TYPER_DEVBITS(typer);
 	}
 
+	its->device_ids = ids;
+
 	for (i = 0; i < GITS_BASER_NR_REGS; i++) {
 		u64 val = readq_relaxed(its->base + GITS_BASER + i * 8);
 		u64 type = GITS_BASER_TYPE(val);
@@ -913,6 +923,7 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
 		}
 
 		val |= alloc_pages - 1;
+		its->tables[i].val = val;
 
 		writeq_relaxed(val, its->base + GITS_BASER + i * 8);
 		tmp = readq_relaxed(its->base + GITS_BASER + i * 8);
@@ -1138,9 +1149,22 @@ static struct its_device *its_find_device(struct its_node *its, u32 dev_id)
 	return its_dev;
 }
 
+static struct its_baser *its_get_baser(struct its_node *its, u32 type)
+{
+	int i;
+
+	for (i = 0; i < GITS_BASER_NR_REGS; i++) {
+		if (GITS_BASER_TYPE(its->tables[i].val) == type)
+			return &its->tables[i];
+	}
+
+	return NULL;
+}
+
 static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
 					    int nvecs)
 {
+	struct its_baser *baser;
 	struct its_device *dev;
 	unsigned long *lpi_map;
 	unsigned long flags;
@@ -1151,6 +1175,16 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
 	int nr_ites;
 	int sz;
 
+	baser = its_get_baser(its, GITS_BASER_TYPE_DEVICE);
+
+	/* Don't allow 'dev_id' that exceeds single, flat table limit */
+	if (baser) {
+		if (dev_id >= (PAGE_ORDER_TO_SIZE(baser->order) /
+			      GITS_BASER_ENTRY_SIZE(baser->val)))
+			return NULL;
+	} else if (ilog2(dev_id) >= its->device_ids)
+		return NULL;
+
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	/*
 	 * At least one bit of EventID is being used, hence a minimum

drivers/irqchip/irq-gic-v3.c

@@ -367,6 +367,13 @@ static asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs
 			if (static_key_true(&supports_deactivate))
 				gic_write_dir(irqnr);
 #ifdef CONFIG_SMP
+			/*
+			 * Unlike GICv2, we don't need an smp_rmb() here.
+			 * The control dependency from gic_read_iar to
+			 * the ISB in gic_write_eoir is enough to ensure
+			 * that any shared data read by handle_IPI will
+			 * be read after the ACK.
+			 */
 			handle_IPI(irqnr, regs);
 #else
 			WARN_ONCE(true, "Unexpected SGI received!\n");
@@ -386,6 +393,15 @@ static void __init gic_dist_init(void)
 	writel_relaxed(0, base + GICD_CTLR);
 	gic_dist_wait_for_rwp();
 
+	/*
+	 * Configure SPIs as non-secure Group-1. This will only matter
+	 * if the GIC only has a single security state. This will not
+	 * do the right thing if the kernel is running in secure mode,
+	 * but that's not the intended use case anyway.
+	 */
+	for (i = 32; i < gic_data.irq_nr; i += 32)
+		writel_relaxed(~0, base + GICD_IGROUPR + i / 8);
+
 	gic_dist_config(base, gic_data.irq_nr, gic_dist_wait_for_rwp);
 
 	/* Enable distributor with ARE, Group1 */
@@ -503,6 +519,9 @@ static void gic_cpu_init(void)
 
 	rbase = gic_data_rdist_sgi_base();
 
+	/* Configure SGIs/PPIs as non-secure Group-1 */
+	writel_relaxed(~0, rbase + GICR_IGROUPR0);
+
 	gic_cpu_config(rbase, gic_redist_wait_for_rwp);
 
 	/* Give LPIs a spin */

drivers/irqchip/irq-gic.c

@@ -72,6 +72,9 @@ struct gic_chip_data {
 	struct irq_chip chip;
 	union gic_base dist_base;
 	union gic_base cpu_base;
+	void __iomem *raw_dist_base;
+	void __iomem *raw_cpu_base;
+	u32 percpu_offset;
 #ifdef CONFIG_CPU_PM
 	u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
 	u32 saved_spi_active[DIV_ROUND_UP(1020, 32)];
@@ -344,6 +347,14 @@ static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 			if (static_key_true(&supports_deactivate))
 				writel_relaxed(irqstat, cpu_base + GIC_CPU_DEACTIVATE);
 #ifdef CONFIG_SMP
+			/*
+			 * Ensure any shared data written by the CPU sending
+			 * the IPI is read after we've read the ACK register
+			 * on the GIC.
+			 *
+			 * Pairs with the write barrier in gic_raise_softirq
+			 */
+			smp_rmb();
 			handle_IPI(irqnr, regs);
 #endif
 			continue;
@@ -391,20 +402,6 @@ static struct irq_chip gic_chip = {
 				  IRQCHIP_MASK_ON_SUSPEND,
 };
 
-static struct irq_chip gic_eoimode1_chip = {
-	.name			= "GICv2",
-	.irq_mask		= gic_eoimode1_mask_irq,
-	.irq_unmask		= gic_unmask_irq,
-	.irq_eoi		= gic_eoimode1_eoi_irq,
-	.irq_set_type		= gic_set_type,
-	.irq_get_irqchip_state	= gic_irq_get_irqchip_state,
-	.irq_set_irqchip_state	= gic_irq_set_irqchip_state,
-	.irq_set_vcpu_affinity	= gic_irq_set_vcpu_affinity,
-	.flags			= IRQCHIP_SET_TYPE_MASKED |
-				  IRQCHIP_SKIP_SET_WAKE |
-				  IRQCHIP_MASK_ON_SUSPEND,
-};
-
 void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
 {
 	BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
@@ -473,7 +470,7 @@ static void __init gic_dist_init(struct gic_chip_data *gic)
 	writel_relaxed(GICD_ENABLE, base + GIC_DIST_CTRL);
 }
 
-static void gic_cpu_init(struct gic_chip_data *gic)
+static int gic_cpu_init(struct gic_chip_data *gic)
 {
 	void __iomem *dist_base = gic_data_dist_base(gic);
 	void __iomem *base = gic_data_cpu_base(gic);
@@ -489,7 +486,9 @@ static void gic_cpu_init(struct gic_chip_data *gic)
 		/*
 		 * Get what the GIC says our CPU mask is.
 		 */
-		BUG_ON(cpu >= NR_GIC_CPU_IF);
+		if (WARN_ON(cpu >= NR_GIC_CPU_IF))
+			return -EINVAL;
+
 		cpu_mask = gic_get_cpumask(gic);
 		gic_cpu_map[cpu] = cpu_mask;
 
@@ -506,6 +505,8 @@ static void gic_cpu_init(struct gic_chip_data *gic)
 
 	writel_relaxed(GICC_INT_PRI_THRESHOLD, base + GIC_CPU_PRIMASK);
 	gic_cpu_if_up(gic);
+
+	return 0;
 }
 
 int gic_cpu_if_down(unsigned int gic_nr)
@@ -531,34 +532,35 @@ int gic_cpu_if_down(unsigned int gic_nr)
  * this function, no interrupts will be delivered by the GIC, and another
  * platform-specific wakeup source must be enabled.
  */
-static void gic_dist_save(unsigned int gic_nr)
+static void gic_dist_save(struct gic_chip_data *gic)
 {
 	unsigned int gic_irqs;
 	void __iomem *dist_base;
 	int i;
 
-	BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
+	if (WARN_ON(!gic))
+		return;
 
-	gic_irqs = gic_data[gic_nr].gic_irqs;
-	dist_base = gic_data_dist_base(&gic_data[gic_nr]);
+	gic_irqs = gic->gic_irqs;
+	dist_base = gic_data_dist_base(gic);
 
 	if (!dist_base)
 		return;
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
-		gic_data[gic_nr].saved_spi_conf[i] =
+		gic->saved_spi_conf[i] =
 			readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
-		gic_data[gic_nr].saved_spi_target[i] =
+		gic->saved_spi_target[i] =
 			readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
-		gic_data[gic_nr].saved_spi_enable[i] =
+		gic->saved_spi_enable[i] =
 			readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
-		gic_data[gic_nr].saved_spi_active[i] =
+		gic->saved_spi_active[i] =
 			readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 }
 
@@ -569,16 +571,17 @@ static void gic_dist_save(unsigned int gic_nr)
  * handled normally, but any edge interrupts that occured will not be seen by
  * the GIC and need to be handled by the platform-specific wakeup source.
  */
-static void gic_dist_restore(unsigned int gic_nr)
+static void gic_dist_restore(struct gic_chip_data *gic)
 {
 	unsigned int gic_irqs;
 	unsigned int i;
 	void __iomem *dist_base;
 
-	BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
+	if (WARN_ON(!gic))
+		return;
 
-	gic_irqs = gic_data[gic_nr].gic_irqs;
-	dist_base = gic_data_dist_base(&gic_data[gic_nr]);
+	gic_irqs = gic->gic_irqs;
+	dist_base = gic_data_dist_base(gic);
 
 	if (!dist_base)
 		return;
@@ -586,7 +589,7 @@ static void gic_dist_restore(unsigned int gic_nr)
 	writel_relaxed(GICD_DISABLE, dist_base + GIC_DIST_CTRL);
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
-		writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
+		writel_relaxed(gic->saved_spi_conf[i],
 			dist_base + GIC_DIST_CONFIG + i * 4);
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
@@ -594,85 +597,87 @@ static void gic_dist_restore(unsigned int gic_nr)
 			dist_base + GIC_DIST_PRI + i * 4);
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
-		writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
+		writel_relaxed(gic->saved_spi_target[i],
 			dist_base + GIC_DIST_TARGET + i * 4);
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
 		writel_relaxed(GICD_INT_EN_CLR_X32,
 			dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
-		writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
+		writel_relaxed(gic->saved_spi_enable[i],
 			dist_base + GIC_DIST_ENABLE_SET + i * 4);
 	}
 
 	for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++) {
 		writel_relaxed(GICD_INT_EN_CLR_X32,
 			dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
-		writel_relaxed(gic_data[gic_nr].saved_spi_active[i],
+		writel_relaxed(gic->saved_spi_active[i],
 			dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 	}
 
 	writel_relaxed(GICD_ENABLE, dist_base + GIC_DIST_CTRL);
 }
 
-static void gic_cpu_save(unsigned int gic_nr)
+static void gic_cpu_save(struct gic_chip_data *gic)
 {
 	int i;
 	u32 *ptr;
 	void __iomem *dist_base;
 	void __iomem *cpu_base;
 
-	BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
+	if (WARN_ON(!gic))
+		return;
 
-	dist_base = gic_data_dist_base(&gic_data[gic_nr]);
-	cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
+	dist_base = gic_data_dist_base(gic);
+	cpu_base = gic_data_cpu_base(gic);
 
 	if (!dist_base || !cpu_base)
 		return;
 
-	ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
+	ptr = raw_cpu_ptr(gic->saved_ppi_enable);
 	for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
 		ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
 
-	ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
+	ptr = raw_cpu_ptr(gic->saved_ppi_active);
 	for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
 		ptr[i] = readl_relaxed(dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 
-	ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
+	ptr = raw_cpu_ptr(gic->saved_ppi_conf);
 	for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
 		ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
 
 }
 
-static void gic_cpu_restore(unsigned int gic_nr)
+static void gic_cpu_restore(struct gic_chip_data *gic)
 {
 	int i;
 	u32 *ptr;
 	void __iomem *dist_base;
 	void __iomem *cpu_base;
 
-	BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
+	if (WARN_ON(!gic))
+		return;
 
-	dist_base = gic_data_dist_base(&gic_data[gic_nr]);
-	cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
+	dist_base = gic_data_dist_base(gic);
+	cpu_base = gic_data_cpu_base(gic);
 
 	if (!dist_base || !cpu_base)
 		return;
 
-	ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
+	ptr = raw_cpu_ptr(gic->saved_ppi_enable);
 	for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
 		writel_relaxed(GICD_INT_EN_CLR_X32,
 			       dist_base + GIC_DIST_ENABLE_CLEAR + i * 4);
 		writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
 	}
 
-	ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_active);
+	ptr = raw_cpu_ptr(gic->saved_ppi_active);
 	for (i = 0; i < DIV_ROUND_UP(32, 32); i++) {
 		writel_relaxed(GICD_INT_EN_CLR_X32,
 			       dist_base + GIC_DIST_ACTIVE_CLEAR + i * 4);
 		writel_relaxed(ptr[i], dist_base + GIC_DIST_ACTIVE_SET + i * 4);
 	}
 
-	ptr = raw_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
+	ptr = raw_cpu_ptr(gic->saved_ppi_conf);
 	for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
 		writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
 
@@ -681,7 +686,7 @@ static void gic_cpu_restore(unsigned int gic_nr)
 					dist_base + GIC_DIST_PRI + i * 4);
 
 	writel_relaxed(GICC_INT_PRI_THRESHOLD, cpu_base + GIC_CPU_PRIMASK);
-	gic_cpu_if_up(&gic_data[gic_nr]);
+	gic_cpu_if_up(gic);
 }
 
 static int gic_notifier(struct notifier_block *self, unsigned long cmd,	void *v)
@@ -696,18 +701,18 @@ static int gic_notifier(struct notifier_block *self, unsigned long cmd,	void *v)
 #endif
 		switch (cmd) {
 		case CPU_PM_ENTER:
-			gic_cpu_save(i);
+			gic_cpu_save(&gic_data[i]);
 			break;
 		case CPU_PM_ENTER_FAILED:
 		case CPU_PM_EXIT:
-			gic_cpu_restore(i);
+			gic_cpu_restore(&gic_data[i]);
 			break;
 		case CPU_CLUSTER_PM_ENTER:
-			gic_dist_save(i);
+			gic_dist_save(&gic_data[i]);
 			break;
 		case CPU_CLUSTER_PM_ENTER_FAILED:
 		case CPU_CLUSTER_PM_EXIT:
-			gic_dist_restore(i);
+			gic_dist_restore(&gic_data[i]);
 			break;
 		}
 	}
@@ -719,26 +724,39 @@ static struct notifier_block gic_notifier_block = {
 	.notifier_call = gic_notifier,
 };
 
-static void __init gic_pm_init(struct gic_chip_data *gic)
+static int __init gic_pm_init(struct gic_chip_data *gic)
 {
 	gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
 		sizeof(u32));
-	BUG_ON(!gic->saved_ppi_enable);
+	if (WARN_ON(!gic->saved_ppi_enable))
+		return -ENOMEM;
 
 	gic->saved_ppi_active = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
 		sizeof(u32));
-	BUG_ON(!gic->saved_ppi_active);
+	if (WARN_ON(!gic->saved_ppi_active))
+		goto free_ppi_enable;
 
 	gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
 		sizeof(u32));
-	BUG_ON(!gic->saved_ppi_conf);
+	if (WARN_ON(!gic->saved_ppi_conf))
+		goto free_ppi_active;
 
 	if (gic == &gic_data[0])
 		cpu_pm_register_notifier(&gic_notifier_block);
+
+	return 0;
+
+free_ppi_active:
+	free_percpu(gic->saved_ppi_active);
+free_ppi_enable:
+	free_percpu(gic->saved_ppi_enable);
+
+	return -ENOMEM;
 }
 #else
-static void __init gic_pm_init(struct gic_chip_data *gic)
+static int __init gic_pm_init(struct gic_chip_data *gic)
 {
+	return 0;
 }
 #endif
 
@@ -1011,63 +1029,65 @@ static const struct irq_domain_ops gic_irq_domain_ops = {
 	.unmap = gic_irq_domain_unmap,
 };
 
-static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
-			   void __iomem *dist_base, void __iomem *cpu_base,
-			   u32 percpu_offset, struct fwnode_handle *handle)
+static int __init __gic_init_bases(struct gic_chip_data *gic, int irq_start,
+				   struct fwnode_handle *handle)
 {
 	irq_hw_number_t hwirq_base;
-	struct gic_chip_data *gic;
-	int gic_irqs, irq_base, i;
+	int gic_irqs, irq_base, i, ret;
 
-	BUG_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR);
+	if (WARN_ON(!gic || gic->domain))
+		return -EINVAL;
 
 	gic_check_cpu_features();
 
-	gic = &gic_data[gic_nr];
-
 	/* Initialize irq_chip */
-	if (static_key_true(&supports_deactivate) && gic_nr == 0) {
-		gic->chip = gic_eoimode1_chip;
-	} else {
 	gic->chip = gic_chip;
-		gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d", gic_nr);
+
+	if (static_key_true(&supports_deactivate) && gic == &gic_data[0]) {
+		gic->chip.irq_mask = gic_eoimode1_mask_irq;
+		gic->chip.irq_eoi = gic_eoimode1_eoi_irq;
+		gic->chip.irq_set_vcpu_affinity = gic_irq_set_vcpu_affinity;
+		gic->chip.name = kasprintf(GFP_KERNEL, "GICv2");
+	} else {
+		gic->chip.name = kasprintf(GFP_KERNEL, "GIC-%d",
+					   (int)(gic - &gic_data[0]));
 	}
 
 #ifdef CONFIG_SMP
-	if (gic_nr == 0)
+	if (gic == &gic_data[0])
 		gic->chip.irq_set_affinity = gic_set_affinity;
 #endif
 
-#ifdef CONFIG_GIC_NON_BANKED
-	if (percpu_offset) { /* Frankein-GIC without banked registers... */
+	if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
+		/* Frankein-GIC without banked registers... */
 		unsigned int cpu;
 
 		gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
 		gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
 		if (WARN_ON(!gic->dist_base.percpu_base ||
 			    !gic->cpu_base.percpu_base)) {
-			free_percpu(gic->dist_base.percpu_base);
-			free_percpu(gic->cpu_base.percpu_base);
-			return;
+			ret = -ENOMEM;
+			goto error;
 		}
 
 		for_each_possible_cpu(cpu) {
 			u32 mpidr = cpu_logical_map(cpu);
 			u32 core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
-			unsigned long offset = percpu_offset * core_id;
-			*per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
-			*per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
+			unsigned long offset = gic->percpu_offset * core_id;
+			*per_cpu_ptr(gic->dist_base.percpu_base, cpu) =
+				gic->raw_dist_base + offset;
+			*per_cpu_ptr(gic->cpu_base.percpu_base, cpu) =
+				gic->raw_cpu_base + offset;
 		}
 
 		gic_set_base_accessor(gic, gic_get_percpu_base);
-	} else
-#endif
-	{			/* Normal, sane GIC... */
-		WARN(percpu_offset,
+	} else {
+		/* Normal, sane GIC... */
+		WARN(gic->percpu_offset,
 		     "GIC_NON_BANKED not enabled, ignoring %08x offset!",
-		     percpu_offset);
-		gic->dist_base.common_base = dist_base;
-		gic->cpu_base.common_base = cpu_base;
+		     gic->percpu_offset);
+		gic->dist_base.common_base = gic->raw_dist_base;
+		gic->cpu_base.common_base = gic->raw_cpu_base;
 		gic_set_base_accessor(gic, gic_get_common_base);
 	}
 
@@ -1090,7 +1110,7 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
 		 * For primary GICs, skip over SGIs.
 		 * For secondary GICs, skip over PPIs, too.
 		 */
-		if (gic_nr == 0 && (irq_start & 31) > 0) {
+		if (gic == &gic_data[0] && (irq_start & 31) > 0) {
 			hwirq_base = 16;
 			if (irq_start != -1)
 				irq_start = (irq_start & ~31) + 16;
@@ -1112,10 +1132,12 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
 					hwirq_base, &gic_irq_domain_ops, gic);
 	}
 
-	if (WARN_ON(!gic->domain))
-		return;
+	if (WARN_ON(!gic->domain)) {
+		ret = -ENODEV;
+		goto error;
+	}
 
-	if (gic_nr == 0) {
+	if (gic == &gic_data[0]) {
 		/*
 		 * Initialize the CPU interface map to all CPUs.
 		 * It will be refined as each CPU probes its ID.
@@ -1133,19 +1155,57 @@ static void __init __gic_init_bases(unsigned int gic_nr, int irq_start,
 	}
 
 	gic_dist_init(gic);
-	gic_cpu_init(gic);
-	gic_pm_init(gic);
+	ret = gic_cpu_init(gic);
+	if (ret)
+		goto error;
+
+	ret = gic_pm_init(gic);
+	if (ret)
+		goto error;
+
+	return 0;
+
+error:
+	if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) {
+		free_percpu(gic->dist_base.percpu_base);
+		free_percpu(gic->cpu_base.percpu_base);
+	}
+
+	kfree(gic->chip.name);
+
+	return ret;
 }
 
 void __init gic_init(unsigned int gic_nr, int irq_start,
 		     void __iomem *dist_base, void __iomem *cpu_base)
 {
+	struct gic_chip_data *gic;
+
+	if (WARN_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR))
+		return;
+
 	/*
 	 * Non-DT/ACPI systems won't run a hypervisor, so let's not
 	 * bother with these...
 	 */
 	static_key_slow_dec(&supports_deactivate);
-	__gic_init_bases(gic_nr, irq_start, dist_base, cpu_base, 0, NULL);
+
+	gic = &gic_data[gic_nr];
+	gic->raw_dist_base = dist_base;
+	gic->raw_cpu_base = cpu_base;
+
+	__gic_init_bases(gic, irq_start, NULL);
+}
+
+static void gic_teardown(struct gic_chip_data *gic)
+{
+	if (WARN_ON(!gic))
+		return;
+
+	if (gic->raw_dist_base)
+		iounmap(gic->raw_dist_base);
+	if (gic->raw_cpu_base)
+		iounmap(gic->raw_cpu_base);
 }
 
 #ifdef CONFIG_OF
@@ -1189,35 +1249,61 @@ static bool gic_check_eoimode(struct device_node *node, void __iomem **base)
 	return true;
 }
 
+static int gic_of_setup(struct gic_chip_data *gic, struct device_node *node)
+{
+	if (!gic || !node)
+		return -EINVAL;
+
+	gic->raw_dist_base = of_iomap(node, 0);
+	if (WARN(!gic->raw_dist_base, "unable to map gic dist registers\n"))
+		goto error;
+
+	gic->raw_cpu_base = of_iomap(node, 1);
+	if (WARN(!gic->raw_cpu_base, "unable to map gic cpu registers\n"))
+		goto error;
+
+	if (of_property_read_u32(node, "cpu-offset", &gic->percpu_offset))
+		gic->percpu_offset = 0;
+
+	return 0;
+
+error:
+	gic_teardown(gic);
+
+	return -ENOMEM;
+}
+
 int __init
 gic_of_init(struct device_node *node, struct device_node *parent)
 {
-	void __iomem *cpu_base;
-	void __iomem *dist_base;
-	u32 percpu_offset;
-	int irq;
+	struct gic_chip_data *gic;
+	int irq, ret;
 
 	if (WARN_ON(!node))
 		return -ENODEV;
 
-	dist_base = of_iomap(node, 0);
-	WARN(!dist_base, "unable to map gic dist registers\n");
+	if (WARN_ON(gic_cnt >= CONFIG_ARM_GIC_MAX_NR))
+		return -EINVAL;
 
-	cpu_base = of_iomap(node, 1);
-	WARN(!cpu_base, "unable to map gic cpu registers\n");
+	gic = &gic_data[gic_cnt];
+
+	ret = gic_of_setup(gic, node);
+	if (ret)
+		return ret;
 
 	/*
 	 * Disable split EOI/Deactivate if either HYP is not available
 	 * or the CPU interface is too small.
 	 */
-	if (gic_cnt == 0 && !gic_check_eoimode(node, &cpu_base))
+	if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base))
 		static_key_slow_dec(&supports_deactivate);
 
-	if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
-		percpu_offset = 0;
+	ret = __gic_init_bases(gic, -1, &node->fwnode);
+	if (ret) {
+		gic_teardown(gic);
+		return ret;
+	}
 
-	__gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset,
-			 &node->fwnode);
 	if (!gic_cnt)
 		gic_init_physaddr(node);
 
@@ -1304,9 +1390,9 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
 				   const unsigned long end)
 {
 	struct acpi_madt_generic_distributor *dist;
-	void __iomem *cpu_base, *dist_base;
 	struct fwnode_handle *domain_handle;
-	int count;
+	struct gic_chip_data *gic = &gic_data[0];
+	int count, ret;
 
 	/* Collect CPU base addresses */
 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
@@ -1316,17 +1402,18 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
 		return -EINVAL;
 	}
 
-	cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
-	if (!cpu_base) {
+	gic->raw_cpu_base = ioremap(cpu_phy_base, ACPI_GIC_CPU_IF_MEM_SIZE);
+	if (!gic->raw_cpu_base) {
 		pr_err("Unable to map GICC registers\n");
 		return -ENOMEM;
 	}
 
 	dist = (struct acpi_madt_generic_distributor *)header;
-	dist_base = ioremap(dist->base_address, ACPI_GICV2_DIST_MEM_SIZE);
-	if (!dist_base) {
+	gic->raw_dist_base = ioremap(dist->base_address,
+				     ACPI_GICV2_DIST_MEM_SIZE);
+	if (!gic->raw_dist_base) {
 		pr_err("Unable to map GICD registers\n");
-		iounmap(cpu_base);
+		gic_teardown(gic);
 		return -ENOMEM;
 	}
 
@@ -1341,15 +1428,20 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header,
 	/*
 	 * Initialize GIC instance zero (no multi-GIC support).
 	 */
-	domain_handle = irq_domain_alloc_fwnode(dist_base);
+	domain_handle = irq_domain_alloc_fwnode(gic->raw_dist_base);
 	if (!domain_handle) {
 		pr_err("Unable to allocate domain handle\n");
-		iounmap(cpu_base);
-		iounmap(dist_base);
+		gic_teardown(gic);
 		return -ENOMEM;
 	}
 
-	__gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle);
+	ret = __gic_init_bases(gic, -1, domain_handle);
+	if (ret) {
+		pr_err("Failed to initialise GIC\n");
+		irq_domain_free_fwnode(domain_handle);
+		gic_teardown(gic);
+		return ret;
+	}
 
 	acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle);
 

drivers/irqchip/irq-lpc32xx.c

+/*
+ * Copyright 2015-2016 Vladimir Zapolskiy <vz@mleia.com>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/io.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <asm/exception.h>
+
+#define LPC32XX_INTC_MASK		0x00
+#define LPC32XX_INTC_RAW		0x04
+#define LPC32XX_INTC_STAT		0x08
+#define LPC32XX_INTC_POL		0x0C
+#define LPC32XX_INTC_TYPE		0x10
+#define LPC32XX_INTC_FIQ		0x14
+
+#define NR_LPC32XX_IC_IRQS		32
+
+struct lpc32xx_irq_chip {
+	void __iomem *base;
+	struct irq_domain *domain;
+	struct irq_chip chip;
+};
+
+static struct lpc32xx_irq_chip *lpc32xx_mic_irqc;
+
+static inline u32 lpc32xx_ic_read(struct lpc32xx_irq_chip *ic, u32 reg)
+{
+	return readl_relaxed(ic->base + reg);
+}
+
+static inline void lpc32xx_ic_write(struct lpc32xx_irq_chip *ic,
+				    u32 reg, u32 val)
+{
+	writel_relaxed(val, ic->base + reg);
+}
+
+static void lpc32xx_irq_mask(struct irq_data *d)
+{
+	struct lpc32xx_irq_chip *ic = irq_data_get_irq_chip_data(d);
+	u32 val, mask = BIT(d->hwirq);
+
+	val = lpc32xx_ic_read(ic, LPC32XX_INTC_MASK) & ~mask;
+	lpc32xx_ic_write(ic, LPC32XX_INTC_MASK, val);
+}
+
+static void lpc32xx_irq_unmask(struct irq_data *d)
+{
+	struct lpc32xx_irq_chip *ic = irq_data_get_irq_chip_data(d);
+	u32 val, mask = BIT(d->hwirq);
+
+	val = lpc32xx_ic_read(ic, LPC32XX_INTC_MASK) | mask;
+	lpc32xx_ic_write(ic, LPC32XX_INTC_MASK, val);
+}
+
+static void lpc32xx_irq_ack(struct irq_data *d)
+{
+	struct lpc32xx_irq_chip *ic = irq_data_get_irq_chip_data(d);
+	u32 mask = BIT(d->hwirq);
+
+	lpc32xx_ic_write(ic, LPC32XX_INTC_RAW, mask);
+}
+
+static int lpc32xx_irq_set_type(struct irq_data *d, unsigned int type)
+{
+	struct lpc32xx_irq_chip *ic = irq_data_get_irq_chip_data(d);
+	u32 val, mask = BIT(d->hwirq);
+	bool high, edge;
+
+	switch (type) {
+	case IRQ_TYPE_EDGE_RISING:
+		edge = true;
+		high = true;
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+		edge = true;
+		high = false;
+		break;
+	case IRQ_TYPE_LEVEL_HIGH:
+		edge = false;
+		high = true;
+		break;
+	case IRQ_TYPE_LEVEL_LOW:
+		edge = false;
+		high = false;
+		break;
+	default:
+		pr_info("unsupported irq type %d\n", type);
+		return -EINVAL;
+	}
+
+	irqd_set_trigger_type(d, type);
+
+	val = lpc32xx_ic_read(ic, LPC32XX_INTC_POL);
+	if (high)
+		val |= mask;
+	else
+		val &= ~mask;
+	lpc32xx_ic_write(ic, LPC32XX_INTC_POL, val);
+
+	val = lpc32xx_ic_read(ic, LPC32XX_INTC_TYPE);
+	if (edge) {
+		val |= mask;
+		irq_set_handler_locked(d, handle_edge_irq);
+	} else {
+		val &= ~mask;
+		irq_set_handler_locked(d, handle_level_irq);
+	}
+	lpc32xx_ic_write(ic, LPC32XX_INTC_TYPE, val);
+
+	return 0;
+}
+
+static void __exception_irq_entry lpc32xx_handle_irq(struct pt_regs *regs)
+{
+	struct lpc32xx_irq_chip *ic = lpc32xx_mic_irqc;
+	u32 hwirq = lpc32xx_ic_read(ic, LPC32XX_INTC_STAT), irq;
+
+	while (hwirq) {
+		irq = __ffs(hwirq);
+		hwirq &= ~BIT(irq);
+		handle_domain_irq(lpc32xx_mic_irqc->domain, irq, regs);
+	}
+}
+
+static void lpc32xx_sic_handler(struct irq_desc *desc)
+{
+	struct lpc32xx_irq_chip *ic = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	u32 hwirq = lpc32xx_ic_read(ic, LPC32XX_INTC_STAT), irq;
+
+	chained_irq_enter(chip, desc);
+
+	while (hwirq) {
+		irq = __ffs(hwirq);
+		hwirq &= ~BIT(irq);
+		generic_handle_irq(irq_find_mapping(ic->domain, irq));
+	}
+
+	chained_irq_exit(chip, desc);
+}
+
+static int lpc32xx_irq_domain_map(struct irq_domain *id, unsigned int virq,
+				  irq_hw_number_t hw)
+{
+	struct lpc32xx_irq_chip *ic = id->host_data;
+
+	irq_set_chip_data(virq, ic);
+	irq_set_chip_and_handler(virq, &ic->chip, handle_level_irq);
+	irq_set_status_flags(virq, IRQ_LEVEL);
+	irq_set_noprobe(virq);
+
+	return 0;
+}
+
+static void lpc32xx_irq_domain_unmap(struct irq_domain *id, unsigned int virq)
+{
+	irq_set_chip_and_handler(virq, NULL, NULL);
+}
+
+static const struct irq_domain_ops lpc32xx_irq_domain_ops = {
+	.map    = lpc32xx_irq_domain_map,
+	.unmap	= lpc32xx_irq_domain_unmap,
+	.xlate  = irq_domain_xlate_twocell,
+};
+
+static int __init lpc32xx_of_ic_init(struct device_node *node,
+				     struct device_node *parent)
+{
+	struct lpc32xx_irq_chip *irqc;
+	bool is_mic = of_device_is_compatible(node, "nxp,lpc3220-mic");
+	const __be32 *reg = of_get_property(node, "reg", NULL);
+	u32 parent_irq, i, addr = reg ? be32_to_cpu(*reg) : 0;
+
+	irqc = kzalloc(sizeof(*irqc), GFP_KERNEL);
+	if (!irqc)
+		return -ENOMEM;
+
+	irqc->base = of_iomap(node, 0);
+	if (!irqc->base) {
+		pr_err("%s: unable to map registers\n", node->full_name);
+		kfree(irqc);
+		return -EINVAL;
+	}
+
+	irqc->chip.irq_ack = lpc32xx_irq_ack;
+	irqc->chip.irq_mask = lpc32xx_irq_mask;
+	irqc->chip.irq_unmask = lpc32xx_irq_unmask;
+	irqc->chip.irq_set_type = lpc32xx_irq_set_type;
+	if (is_mic)
+		irqc->chip.name = kasprintf(GFP_KERNEL, "%08x.mic", addr);
+	else
+		irqc->chip.name = kasprintf(GFP_KERNEL, "%08x.sic", addr);
+
+	irqc->domain = irq_domain_add_linear(node, NR_LPC32XX_IC_IRQS,
+					     &lpc32xx_irq_domain_ops, irqc);
+	if (!irqc->domain) {
+		pr_err("unable to add irq domain\n");
+		iounmap(irqc->base);
+		kfree(irqc->chip.name);
+		kfree(irqc);
+		return -ENODEV;
+	}
+
+	if (is_mic) {
+		lpc32xx_mic_irqc = irqc;
+		set_handle_irq(lpc32xx_handle_irq);
+	} else {
+		for (i = 0; i < of_irq_count(node); i++) {
+			parent_irq = irq_of_parse_and_map(node, i);
+			if (parent_irq)
+				irq_set_chained_handler_and_data(parent_irq,
+						 lpc32xx_sic_handler, irqc);
+		}
+	}
+
+	lpc32xx_ic_write(irqc, LPC32XX_INTC_MASK, 0x00);
+	lpc32xx_ic_write(irqc, LPC32XX_INTC_POL,  0x00);
+	lpc32xx_ic_write(irqc, LPC32XX_INTC_TYPE, 0x00);
+
+	return 0;
+}
+
+IRQCHIP_DECLARE(nxp_lpc32xx_mic, "nxp,lpc3220-mic", lpc32xx_of_ic_init);
+IRQCHIP_DECLARE(nxp_lpc32xx_sic, "nxp,lpc3220-sic", lpc32xx_of_ic_init);

drivers/irqchip/irq-ls-scfg-msi.c

+/*
+ * Freescale SCFG MSI(-X) support
+ *
+ * Copyright (C) 2016 Freescale Semiconductor.
+ *
+ * Author: Minghuan Lian <Minghuan.Lian@nxp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/spinlock.h>
+
+#define MSI_MAX_IRQS	32
+#define MSI_IBS_SHIFT	3
+#define MSIR		4
+
+struct ls_scfg_msi {
+	spinlock_t		lock;
+	struct platform_device	*pdev;
+	struct irq_domain	*parent;
+	struct irq_domain	*msi_domain;
+	void __iomem		*regs;
+	phys_addr_t		msiir_addr;
+	int			irq;
+	DECLARE_BITMAP(used, MSI_MAX_IRQS);
+};
+
+static struct irq_chip ls_scfg_msi_irq_chip = {
+	.name = "MSI",
+	.irq_mask	= pci_msi_mask_irq,
+	.irq_unmask	= pci_msi_unmask_irq,
+};
+
+static struct msi_domain_info ls_scfg_msi_domain_info = {
+	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS |
+		   MSI_FLAG_USE_DEF_CHIP_OPS |
+		   MSI_FLAG_PCI_MSIX),
+	.chip	= &ls_scfg_msi_irq_chip,
+};
+
+static void ls_scfg_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
+{
+	struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(data);
+
+	msg->address_hi = upper_32_bits(msi_data->msiir_addr);
+	msg->address_lo = lower_32_bits(msi_data->msiir_addr);
+	msg->data = data->hwirq << MSI_IBS_SHIFT;
+}
+
+static int ls_scfg_msi_set_affinity(struct irq_data *irq_data,
+				    const struct cpumask *mask, bool force)
+{
+	return -EINVAL;
+}
+
+static struct irq_chip ls_scfg_msi_parent_chip = {
+	.name			= "SCFG",
+	.irq_compose_msi_msg	= ls_scfg_msi_compose_msg,
+	.irq_set_affinity	= ls_scfg_msi_set_affinity,
+};
+
+static int ls_scfg_msi_domain_irq_alloc(struct irq_domain *domain,
+					unsigned int virq,
+					unsigned int nr_irqs,
+					void *args)
+{
+	struct ls_scfg_msi *msi_data = domain->host_data;
+	int pos, err = 0;
+
+	WARN_ON(nr_irqs != 1);
+
+	spin_lock(&msi_data->lock);
+	pos = find_first_zero_bit(msi_data->used, MSI_MAX_IRQS);
+	if (pos < MSI_MAX_IRQS)
+		__set_bit(pos, msi_data->used);
+	else
+		err = -ENOSPC;
+	spin_unlock(&msi_data->lock);
+
+	if (err)
+		return err;
+
+	irq_domain_set_info(domain, virq, pos,
+			    &ls_scfg_msi_parent_chip, msi_data,
+			    handle_simple_irq, NULL, NULL);
+
+	return 0;
+}
+
+static void ls_scfg_msi_domain_irq_free(struct irq_domain *domain,
+				   unsigned int virq, unsigned int nr_irqs)
+{
+	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+	struct ls_scfg_msi *msi_data = irq_data_get_irq_chip_data(d);
+	int pos;
+
+	pos = d->hwirq;
+	if (pos < 0 || pos >= MSI_MAX_IRQS) {
+		pr_err("failed to teardown msi. Invalid hwirq %d\n", pos);
+		return;
+	}
+
+	spin_lock(&msi_data->lock);
+	__clear_bit(pos, msi_data->used);
+	spin_unlock(&msi_data->lock);
+}
+
+static const struct irq_domain_ops ls_scfg_msi_domain_ops = {
+	.alloc	= ls_scfg_msi_domain_irq_alloc,
+	.free	= ls_scfg_msi_domain_irq_free,
+};
+
+static void ls_scfg_msi_irq_handler(struct irq_desc *desc)
+{
+	struct ls_scfg_msi *msi_data = irq_desc_get_handler_data(desc);
+	unsigned long val;
+	int pos, virq;
+
+	chained_irq_enter(irq_desc_get_chip(desc), desc);
+
+	val = ioread32be(msi_data->regs + MSIR);
+	for_each_set_bit(pos, &val, MSI_MAX_IRQS) {
+		virq = irq_find_mapping(msi_data->parent, (31 - pos));
+		if (virq)
+			generic_handle_irq(virq);
+	}
+
+	chained_irq_exit(irq_desc_get_chip(desc), desc);
+}
+
+static int ls_scfg_msi_domains_init(struct ls_scfg_msi *msi_data)
+{
+	/* Initialize MSI domain parent */
+	msi_data->parent = irq_domain_add_linear(NULL,
+						 MSI_MAX_IRQS,
+						 &ls_scfg_msi_domain_ops,
+						 msi_data);
+	if (!msi_data->parent) {
+		dev_err(&msi_data->pdev->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+
+	msi_data->msi_domain = pci_msi_create_irq_domain(
+				of_node_to_fwnode(msi_data->pdev->dev.of_node),
+				&ls_scfg_msi_domain_info,
+				msi_data->parent);
+	if (!msi_data->msi_domain) {
+		dev_err(&msi_data->pdev->dev, "failed to create MSI domain\n");
+		irq_domain_remove(msi_data->parent);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static int ls_scfg_msi_probe(struct platform_device *pdev)
+{
+	struct ls_scfg_msi *msi_data;
+	struct resource *res;
+	int ret;
+
+	msi_data = devm_kzalloc(&pdev->dev, sizeof(*msi_data), GFP_KERNEL);
+	if (!msi_data)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	msi_data->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(msi_data->regs)) {
+		dev_err(&pdev->dev, "failed to initialize 'regs'\n");
+		return PTR_ERR(msi_data->regs);
+	}
+	msi_data->msiir_addr = res->start;
+
+	msi_data->irq = platform_get_irq(pdev, 0);
+	if (msi_data->irq <= 0) {
+		dev_err(&pdev->dev, "failed to get MSI irq\n");
+		return -ENODEV;
+	}
+
+	msi_data->pdev = pdev;
+	spin_lock_init(&msi_data->lock);
+
+	ret = ls_scfg_msi_domains_init(msi_data);
+	if (ret)
+		return ret;
+
+	irq_set_chained_handler_and_data(msi_data->irq,
+					 ls_scfg_msi_irq_handler,
+					 msi_data);
+
+	platform_set_drvdata(pdev, msi_data);
+
+	return 0;
+}
+
+static int ls_scfg_msi_remove(struct platform_device *pdev)
+{
+	struct ls_scfg_msi *msi_data = platform_get_drvdata(pdev);
+
+	irq_set_chained_handler_and_data(msi_data->irq, NULL, NULL);
+
+	irq_domain_remove(msi_data->msi_domain);
+	irq_domain_remove(msi_data->parent);
+
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static const struct of_device_id ls_scfg_msi_id[] = {
+	{ .compatible = "fsl,1s1021a-msi", },
+	{ .compatible = "fsl,1s1043a-msi", },
+	{},
+};
+
+static struct platform_driver ls_scfg_msi_driver = {
+	.driver = {
+		.name = "ls-scfg-msi",
+		.of_match_table = ls_scfg_msi_id,
+	},
+	.probe = ls_scfg_msi_probe,
+	.remove = ls_scfg_msi_remove,
+};
+
+module_platform_driver(ls_scfg_msi_driver);
+
+MODULE_AUTHOR("Minghuan Lian <Minghuan.Lian@nxp.com>");
+MODULE_DESCRIPTION("Freescale Layerscape SCFG MSI controller driver");
+MODULE_LICENSE("GPL v2");

drivers/irqchip/irq-mbigen.c

@@ -263,8 +263,8 @@ static int mbigen_device_probe(struct platform_device *pdev)
 
 		parent = platform_bus_type.dev_root;
 		child = of_platform_device_create(np, NULL, parent);
-		if (IS_ERR(child))
-			return PTR_ERR(child);
+		if (!child)
+			return -ENOMEM;
 
 		if (of_property_read_u32(child->dev.of_node, "num-pins",
 					 &num_pins) < 0) {

drivers/irqchip/irq-tegra.c

@@ -235,7 +235,7 @@ static int tegra_ictlr_domain_translate(struct irq_domain *d,
 			return -EINVAL;
 
 		*hwirq = fwspec->param[1];
-		*type = fwspec->param[2];
+		*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
 		return 0;
 	}
 

include/linux/irqchip/arm-gic-v3.h

@@ -102,8 +102,6 @@
 #define GICR_SYNCR			0x00C0
 #define GICR_MOVLPIR			0x0100
 #define GICR_MOVALLR			0x0110
-#define GICR_ISACTIVER			GICD_ISACTIVER
-#define GICR_ICACTIVER			GICD_ICACTIVER
 #define GICR_IDREGS			GICD_IDREGS
 #define GICR_PIDR2			GICD_PIDR2
 

kernel/irq/manage.c

@@ -1407,7 +1407,7 @@ int setup_irq(unsigned int irq, struct irqaction *act)
 	int retval;
 	struct irq_desc *desc = irq_to_desc(irq);
 
-	if (WARN_ON(irq_settings_is_per_cpu_devid(desc)))
+	if (!desc || WARN_ON(irq_settings_is_per_cpu_devid(desc)))
 		return -EINVAL;
 	chip_bus_lock(desc);
 	retval = __setup_irq(irq, desc, act);