196 lines
4.9 KiB
Diff
196 lines
4.9 KiB
Diff
From 19d3814e7b325f8965fd71f329b3467a97f8d217 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sun, 20 Jan 2013 22:00:50 +0100
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Subject: [PATCH 02/14] MIPS: ralink: adds irq code
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All of the Ralink Wifi SoC currently supported by this series share the same
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interrupt controller (INTC).
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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Patchwork: http://patchwork.linux-mips.org/patch/4890/
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---
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arch/mips/ralink/irq.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 176 insertions(+)
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create mode 100644 arch/mips/ralink/irq.c
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--- /dev/null
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+++ b/arch/mips/ralink/irq.c
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@@ -0,0 +1,176 @@
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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+ */
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+
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+#include <linux/io.h>
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+#include <linux/bitops.h>
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+#include <linux/of_platform.h>
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+#include <linux/of_address.h>
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+#include <linux/of_irq.h>
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+#include <linux/irqdomain.h>
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+#include <linux/interrupt.h>
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+
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+#include <asm/irq_cpu.h>
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+#include <asm/mipsregs.h>
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+
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+#include "common.h"
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+
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+/* INTC register offsets */
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+#define INTC_REG_STATUS0 0x00
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+#define INTC_REG_STATUS1 0x04
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+#define INTC_REG_TYPE 0x20
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+#define INTC_REG_RAW_STATUS 0x30
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+#define INTC_REG_ENABLE 0x34
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+#define INTC_REG_DISABLE 0x38
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+
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+#define INTC_INT_GLOBAL BIT(31)
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+
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+#define RALINK_CPU_IRQ_INTC (MIPS_CPU_IRQ_BASE + 2)
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+#define RALINK_CPU_IRQ_FE (MIPS_CPU_IRQ_BASE + 5)
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+#define RALINK_CPU_IRQ_WIFI (MIPS_CPU_IRQ_BASE + 6)
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+#define RALINK_CPU_IRQ_COUNTER (MIPS_CPU_IRQ_BASE + 7)
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+
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+/* we have a cascade of 8 irqs */
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+#define RALINK_INTC_IRQ_BASE 8
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+
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+/* we have 32 SoC irqs */
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+#define RALINK_INTC_IRQ_COUNT 32
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+
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+#define RALINK_INTC_IRQ_PERFC (RALINK_INTC_IRQ_BASE + 9)
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+
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+static void __iomem *rt_intc_membase;
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+
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+static inline void rt_intc_w32(u32 val, unsigned reg)
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+{
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+ __raw_writel(val, rt_intc_membase + reg);
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+}
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+
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+static inline u32 rt_intc_r32(unsigned reg)
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+{
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+ return __raw_readl(rt_intc_membase + reg);
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+}
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+
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+static void ralink_intc_irq_unmask(struct irq_data *d)
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+{
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+ rt_intc_w32(BIT(d->hwirq), INTC_REG_ENABLE);
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+}
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+
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+static void ralink_intc_irq_mask(struct irq_data *d)
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+{
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+ rt_intc_w32(BIT(d->hwirq), INTC_REG_DISABLE);
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+}
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+
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+static struct irq_chip ralink_intc_irq_chip = {
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+ .name = "INTC",
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+ .irq_unmask = ralink_intc_irq_unmask,
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+ .irq_mask = ralink_intc_irq_mask,
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+ .irq_mask_ack = ralink_intc_irq_mask,
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+};
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+
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+unsigned int __cpuinit get_c0_compare_int(void)
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+{
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+ return CP0_LEGACY_COMPARE_IRQ;
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+}
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+
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+static void ralink_intc_irq_handler(unsigned int irq, struct irq_desc *desc)
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+{
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+ u32 pending = rt_intc_r32(INTC_REG_STATUS0);
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+
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+ if (pending) {
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+ struct irq_domain *domain = irq_get_handler_data(irq);
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+ generic_handle_irq(irq_find_mapping(domain, __ffs(pending)));
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+ } else {
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+ spurious_interrupt();
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+ }
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+}
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+
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+asmlinkage void plat_irq_dispatch(void)
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+{
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+ unsigned long pending;
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+
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+ pending = read_c0_status() & read_c0_cause() & ST0_IM;
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+
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+ if (pending & STATUSF_IP7)
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+ do_IRQ(RALINK_CPU_IRQ_COUNTER);
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+
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+ else if (pending & STATUSF_IP5)
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+ do_IRQ(RALINK_CPU_IRQ_FE);
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+
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+ else if (pending & STATUSF_IP6)
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+ do_IRQ(RALINK_CPU_IRQ_WIFI);
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+
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+ else if (pending & STATUSF_IP2)
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+ do_IRQ(RALINK_CPU_IRQ_INTC);
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+
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+ else
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+ spurious_interrupt();
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+}
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+
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+static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
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+{
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+ irq_set_chip_and_handler(irq, &ralink_intc_irq_chip, handle_level_irq);
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+
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+ return 0;
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+}
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+
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+static const struct irq_domain_ops irq_domain_ops = {
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+ .xlate = irq_domain_xlate_onecell,
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+ .map = intc_map,
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+};
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+
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+static int __init intc_of_init(struct device_node *node,
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+ struct device_node *parent)
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+{
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+ struct resource res;
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+ struct irq_domain *domain;
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+
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+ mips_cpu_irq_init();
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+
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+ if (of_address_to_resource(node, 0, &res))
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+ panic("Failed to get intc memory range");
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+
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+ if (request_mem_region(res.start, resource_size(&res),
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+ res.name) < 0)
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+ pr_err("Failed to request intc memory");
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+
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+ rt_intc_membase = ioremap_nocache(res.start,
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+ resource_size(&res));
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+ if (!rt_intc_membase)
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+ panic("Failed to remap intc memory");
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+
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+ /* disable all interrupts */
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+ rt_intc_w32(~0, INTC_REG_DISABLE);
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+
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+ /* route all INTC interrupts to MIPS HW0 interrupt */
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+ rt_intc_w32(0, INTC_REG_TYPE);
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+
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+ domain = irq_domain_add_legacy(node, RALINK_INTC_IRQ_COUNT,
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+ RALINK_INTC_IRQ_BASE, 0, &irq_domain_ops, NULL);
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+ if (!domain)
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+ panic("Failed to add irqdomain");
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+
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+ rt_intc_w32(INTC_INT_GLOBAL, INTC_REG_ENABLE);
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+
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+ irq_set_chained_handler(RALINK_CPU_IRQ_INTC, ralink_intc_irq_handler);
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+ irq_set_handler_data(RALINK_CPU_IRQ_INTC, domain);
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+
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+ cp0_perfcount_irq = irq_create_mapping(domain, 9);
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+
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+ return 0;
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+}
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+
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+static struct of_device_id __initdata of_irq_ids[] = {
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+ { .compatible = "ralink,rt2880-intc", .data = intc_of_init },
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+ {},
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+};
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+
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+void __init arch_init_irq(void)
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+{
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+ of_irq_init(of_irq_ids);
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+}
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+
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