+++ /dev/null
-From 833836f47b4191e93267b91fcab38dd15affcd28 Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Sun, 20 Jan 2013 22:00:50 +0100
-Subject: [PATCH 02/79] MIPS: ralink: adds irq code
-
-All of the Ralink Wifi SoC currently supported by this series share the same
-interrupt controller (INTC).
-
-Signed-off-by: John Crispin <blogic@openwrt.org>
-Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
-Patchwork: http://patchwork.linux-mips.org/patch/4890/
----
- arch/mips/ralink/irq.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++++
- 1 file changed, 176 insertions(+)
- create mode 100644 arch/mips/ralink/irq.c
-
-diff --git a/arch/mips/ralink/irq.c b/arch/mips/ralink/irq.c
-new file mode 100644
-index 0000000..e62c975
---- /dev/null
-+++ b/arch/mips/ralink/irq.c
-@@ -0,0 +1,176 @@
-+/*
-+ * 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.
-+ *
-+ * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
-+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
-+ */
-+
-+#include <linux/io.h>
-+#include <linux/bitops.h>
-+#include <linux/of_platform.h>
-+#include <linux/of_address.h>
-+#include <linux/of_irq.h>
-+#include <linux/irqdomain.h>
-+#include <linux/interrupt.h>
-+
-+#include <asm/irq_cpu.h>
-+#include <asm/mipsregs.h>
-+
-+#include "common.h"
-+
-+/* INTC register offsets */
-+#define INTC_REG_STATUS0 0x00
-+#define INTC_REG_STATUS1 0x04
-+#define INTC_REG_TYPE 0x20
-+#define INTC_REG_RAW_STATUS 0x30
-+#define INTC_REG_ENABLE 0x34
-+#define INTC_REG_DISABLE 0x38
-+
-+#define INTC_INT_GLOBAL BIT(31)
-+
-+#define RALINK_CPU_IRQ_INTC (MIPS_CPU_IRQ_BASE + 2)
-+#define RALINK_CPU_IRQ_FE (MIPS_CPU_IRQ_BASE + 5)
-+#define RALINK_CPU_IRQ_WIFI (MIPS_CPU_IRQ_BASE + 6)
-+#define RALINK_CPU_IRQ_COUNTER (MIPS_CPU_IRQ_BASE + 7)
-+
-+/* we have a cascade of 8 irqs */
-+#define RALINK_INTC_IRQ_BASE 8
-+
-+/* we have 32 SoC irqs */
-+#define RALINK_INTC_IRQ_COUNT 32
-+
-+#define RALINK_INTC_IRQ_PERFC (RALINK_INTC_IRQ_BASE + 9)
-+
-+static void __iomem *rt_intc_membase;
-+
-+static inline void rt_intc_w32(u32 val, unsigned reg)
-+{
-+ __raw_writel(val, rt_intc_membase + reg);
-+}
-+
-+static inline u32 rt_intc_r32(unsigned reg)
-+{
-+ return __raw_readl(rt_intc_membase + reg);
-+}
-+
-+static void ralink_intc_irq_unmask(struct irq_data *d)
-+{
-+ rt_intc_w32(BIT(d->hwirq), INTC_REG_ENABLE);
-+}
-+
-+static void ralink_intc_irq_mask(struct irq_data *d)
-+{
-+ rt_intc_w32(BIT(d->hwirq), INTC_REG_DISABLE);
-+}
-+
-+static struct irq_chip ralink_intc_irq_chip = {
-+ .name = "INTC",
-+ .irq_unmask = ralink_intc_irq_unmask,
-+ .irq_mask = ralink_intc_irq_mask,
-+ .irq_mask_ack = ralink_intc_irq_mask,
-+};
-+
-+unsigned int __cpuinit get_c0_compare_int(void)
-+{
-+ return CP0_LEGACY_COMPARE_IRQ;
-+}
-+
-+static void ralink_intc_irq_handler(unsigned int irq, struct irq_desc *desc)
-+{
-+ u32 pending = rt_intc_r32(INTC_REG_STATUS0);
-+
-+ if (pending) {
-+ struct irq_domain *domain = irq_get_handler_data(irq);
-+ generic_handle_irq(irq_find_mapping(domain, __ffs(pending)));
-+ } else {
-+ spurious_interrupt();
-+ }
-+}
-+
-+asmlinkage void plat_irq_dispatch(void)
-+{
-+ unsigned long pending;
-+
-+ pending = read_c0_status() & read_c0_cause() & ST0_IM;
-+
-+ if (pending & STATUSF_IP7)
-+ do_IRQ(RALINK_CPU_IRQ_COUNTER);
-+
-+ else if (pending & STATUSF_IP5)
-+ do_IRQ(RALINK_CPU_IRQ_FE);
-+
-+ else if (pending & STATUSF_IP6)
-+ do_IRQ(RALINK_CPU_IRQ_WIFI);
-+
-+ else if (pending & STATUSF_IP2)
-+ do_IRQ(RALINK_CPU_IRQ_INTC);
-+
-+ else
-+ spurious_interrupt();
-+}
-+
-+static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
-+{
-+ irq_set_chip_and_handler(irq, &ralink_intc_irq_chip, handle_level_irq);
-+
-+ return 0;
-+}
-+
-+static const struct irq_domain_ops irq_domain_ops = {
-+ .xlate = irq_domain_xlate_onecell,
-+ .map = intc_map,
-+};
-+
-+static int __init intc_of_init(struct device_node *node,
-+ struct device_node *parent)
-+{
-+ struct resource res;
-+ struct irq_domain *domain;
-+
-+ mips_cpu_irq_init();
-+
-+ if (of_address_to_resource(node, 0, &res))
-+ panic("Failed to get intc memory range");
-+
-+ if (request_mem_region(res.start, resource_size(&res),
-+ res.name) < 0)
-+ pr_err("Failed to request intc memory");
-+
-+ rt_intc_membase = ioremap_nocache(res.start,
-+ resource_size(&res));
-+ if (!rt_intc_membase)
-+ panic("Failed to remap intc memory");
-+
-+ /* disable all interrupts */
-+ rt_intc_w32(~0, INTC_REG_DISABLE);
-+
-+ /* route all INTC interrupts to MIPS HW0 interrupt */
-+ rt_intc_w32(0, INTC_REG_TYPE);
-+
-+ domain = irq_domain_add_legacy(node, RALINK_INTC_IRQ_COUNT,
-+ RALINK_INTC_IRQ_BASE, 0, &irq_domain_ops, NULL);
-+ if (!domain)
-+ panic("Failed to add irqdomain");
-+
-+ rt_intc_w32(INTC_INT_GLOBAL, INTC_REG_ENABLE);
-+
-+ irq_set_chained_handler(RALINK_CPU_IRQ_INTC, ralink_intc_irq_handler);
-+ irq_set_handler_data(RALINK_CPU_IRQ_INTC, domain);
-+
-+ cp0_perfcount_irq = irq_create_mapping(domain, 9);
-+
-+ return 0;
-+}
-+
-+static struct of_device_id __initdata of_irq_ids[] = {
-+ { .compatible = "ralink,rt2880-intc", .data = intc_of_init },
-+ {},
-+};
-+
-+void __init arch_init_irq(void)
-+{
-+ of_irq_init(of_irq_ids);
-+}
-+
---
-1.7.10.4
-
projects / openwrt.git / blobdiff