207 lines
4.8 KiB
C
207 lines
4.8 KiB
C
/*
|
|
* 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"
|
|
|
|
#define INTC_INT_GLOBAL BIT(31)
|
|
|
|
#define RALINK_CPU_IRQ_INTC (MIPS_CPU_IRQ_BASE + 2)
|
|
#define RALINK_CPU_IRQ_PCI (MIPS_CPU_IRQ_BASE + 4)
|
|
#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)
|
|
|
|
enum rt_intc_regs_enum {
|
|
INTC_REG_STATUS0 = 0,
|
|
INTC_REG_STATUS1,
|
|
INTC_REG_TYPE,
|
|
INTC_REG_RAW_STATUS,
|
|
INTC_REG_ENABLE,
|
|
INTC_REG_DISABLE,
|
|
};
|
|
|
|
static u32 rt_intc_regs[] = {
|
|
[INTC_REG_STATUS0] = 0x00,
|
|
[INTC_REG_STATUS1] = 0x04,
|
|
[INTC_REG_TYPE] = 0x20,
|
|
[INTC_REG_RAW_STATUS] = 0x30,
|
|
[INTC_REG_ENABLE] = 0x34,
|
|
[INTC_REG_DISABLE] = 0x38,
|
|
};
|
|
|
|
static void __iomem *rt_intc_membase;
|
|
|
|
static int rt_perfcount_irq;
|
|
|
|
static inline void rt_intc_w32(u32 val, unsigned reg)
|
|
{
|
|
__raw_writel(val, rt_intc_membase + rt_intc_regs[reg]);
|
|
}
|
|
|
|
static inline u32 rt_intc_r32(unsigned reg)
|
|
{
|
|
return __raw_readl(rt_intc_membase + rt_intc_regs[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,
|
|
};
|
|
|
|
int get_c0_perfcount_int(void)
|
|
{
|
|
return rt_perfcount_irq;
|
|
}
|
|
|
|
unsigned int 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_IP4)
|
|
do_IRQ(RALINK_CPU_IRQ_PCI);
|
|
|
|
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;
|
|
int irq;
|
|
|
|
if (!of_property_read_u32_array(node, "ralink,intc-registers",
|
|
rt_intc_regs, 6))
|
|
pr_info("intc: using register map from devicetree\n");
|
|
|
|
irq = irq_of_parse_and_map(node, 0);
|
|
if (!irq)
|
|
panic("Failed to get INTC IRQ");
|
|
|
|
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(irq, ralink_intc_irq_handler);
|
|
irq_set_handler_data(irq, domain);
|
|
|
|
/* tell the kernel which irq is used for performance monitoring */
|
|
rt_perfcount_irq = irq_create_mapping(domain, 9);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id __initdata of_irq_ids[] = {
|
|
{ .compatible = "mti,cpu-interrupt-controller", .data = mips_cpu_irq_of_init },
|
|
{ .compatible = "ralink,rt2880-intc", .data = intc_of_init },
|
|
{},
|
|
};
|
|
|
|
void __init arch_init_irq(void)
|
|
{
|
|
of_irq_init(of_irq_ids);
|
|
}
|
|
|