new file mode 100644
@@ -0,0 +1,17 @@
+EZchip NPS Interrupt Controller
+
+Required properties:
+
+- compatible : should be "ezchip,nps400-ic"
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode an
+ interrupt source. The value shall be 1.
+
+
+Example:
+
+intc: interrupt-controller {
+ compatible = "ezchip,nps400-ic";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+};
@@ -55,3 +55,4 @@ obj-$(CONFIG_RENESAS_H8S_INTC) += irq-renesas-h8s.o
obj-$(CONFIG_ARCH_SA1100) += irq-sa11x0.o
obj-$(CONFIG_INGENIC_IRQ) += irq-ingenic.o
obj-$(CONFIG_IMX_GPCV2) += irq-imx-gpcv2.o
+obj-$(CONFIG_ARC_PLAT_EZNPS) += irq-eznps.o
new file mode 100644
@@ -0,0 +1,139 @@
+/*
+ * Copyright(c) 2015 EZchip Technologies.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip.h>
+#include <asm/irq.h>
+
+/*
+ * NPS400 core includes an Interrupt Controller (IC) support.
+ * All cores can deactivate level irqs at first level control
+ * at cores mesh layer called MTM.
+ * For devices out side chip e.g. uart, network there is another
+ * level called Global Interrupt Manager (GIM).
+ * This second level can control level and edge interrupt.
+ *
+ * NOTE: AUX_IENABLE and CTOP_AUX_IACK are auxiliary registers
+ * with private HW copy per CPU.
+ */
+
+static void nps400_irq_mask(struct irq_data *irqd)
+{
+ unsigned int ienb;
+ unsigned int irq = irqd_to_hwirq(irqd);
+
+ ienb = read_aux_reg(AUX_IENABLE);
+ ienb &= ~(1 << irq);
+ write_aux_reg(AUX_IENABLE, ienb);
+}
+
+static void nps400_irq_unmask(struct irq_data *irqd)
+{
+ unsigned int ienb;
+ unsigned int irq = irqd_to_hwirq(irqd);
+
+ ienb = read_aux_reg(AUX_IENABLE);
+ ienb |= (1 << irq);
+ write_aux_reg(AUX_IENABLE, ienb);
+}
+
+static void nps400_irq_eoi_global(struct irq_data *irqd)
+{
+ unsigned int irq = irqd_to_hwirq(irqd);
+
+ write_aux_reg(CTOP_AUX_IACK, 1 << irq);
+
+ /* Don't ack before all device access attempts are done */
+ mb();
+
+ __asm__ __volatile__ (
+ " .word %0\n"
+ :
+ : "i"(CTOP_INST_RSPI_GIC_0_R12)
+ : "memory");
+}
+
+static void nps400_irq_eoi(struct irq_data *irqd)
+{
+ unsigned int irq = irqd_to_hwirq(irqd);
+
+ write_aux_reg(CTOP_AUX_IACK, 1 << irq);
+}
+
+static struct irq_chip nps400_irq_chip_fasteoi = {
+ .name = "NPS400 IC Global",
+ .irq_mask = nps400_irq_mask,
+ .irq_unmask = nps400_irq_unmask,
+ .irq_eoi = nps400_irq_eoi_global,
+};
+
+static struct irq_chip nps400_irq_chip_percpu = {
+ .name = "NPS400 IC",
+ .irq_mask = nps400_irq_mask,
+ .irq_unmask = nps400_irq_unmask,
+ .irq_eoi = nps400_irq_eoi,
+};
+
+static int nps400_irq_map(struct irq_domain *d, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ switch (hw) {
+ case TIMER0_IRQ:
+ irq_set_percpu_devid(virq);
+ irq_set_chip_and_handler(virq, &nps400_irq_chip_percpu,
+ handle_percpu_devid_irq);
+ break;
+ default:
+ irq_set_chip_and_handler(virq, &nps400_irq_chip_fasteoi,
+ handle_fasteoi_irq);
+ break;
+ }
+
+ return 0;
+}
+
+static const struct irq_domain_ops nps400_irq_ops = {
+ .xlate = irq_domain_xlate_onecell,
+ .map = nps400_irq_map,
+};
+
+static struct irq_domain *nps400_root_domain;
+
+static void nps400_handle_irq(unsigned int hwirq, struct pt_regs *regs)
+{
+ handle_domain_irq(nps400_root_domain, hwirq, regs);
+}
+
+static int __init nps400_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ if (parent)
+ panic("DeviceTree incore ic not a root irq controller\n");
+
+ nps400_root_domain = irq_domain_add_linear(node, NR_CPU_IRQS,
+ &nps400_irq_ops, NULL);
+
+ if (!nps400_root_domain)
+ panic("nps400 root irq domain not avail\n");
+
+ set_handle_irq(nps400_handle_irq);
+
+ return 0;
+}
+IRQCHIP_DECLARE(ezchip_nps400_ic, "ezchip,nps400-ic", nps400_of_init);