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/*
* Allwinner A1X SoCs IRQ chip driver.
*
* Copyright (C) 2012 Maxime Ripard
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* Based on code from
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Benn Huang <benn@allwinnertech.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/irqchip/sunxi.h>
#define SUNXI_IRQ_VECTOR_REG 0x00
#define SUNXI_IRQ_PROTECTION_REG 0x08
#define SUNXI_IRQ_NMI_CTRL_REG 0x0c
#define SUNXI_IRQ_PENDING_REG(x) (0x10 + 0x4 * x)
#define SUNXI_IRQ_FIQ_PENDING_REG(x) (0x20 + 0x4 * x)
#define SUNXI_IRQ_ENABLE_REG(x) (0x40 + 0x4 * x)
#define SUNXI_IRQ_MASK_REG(x) (0x50 + 0x4 * x)
static void __iomem *sunxi_irq_base;
static struct irq_domain *sunxi_irq_domain;
void sunxi_irq_ack(struct irq_data *irqd)
{
unsigned int irq = irqd_to_hwirq(irqd);
unsigned int irq_off = irq % 32;
int reg = irq / 32;
u32 val;
val = readl(sunxi_irq_base + SUNXI_IRQ_PENDING_REG(reg));
writel(val | (1 << irq_off),
sunxi_irq_base + SUNXI_IRQ_PENDING_REG(reg));
}
static void sunxi_irq_mask(struct irq_data *irqd)
{
unsigned int irq = irqd_to_hwirq(irqd);
unsigned int irq_off = irq % 32;
int reg = irq / 32;
u32 val;
val = readl(sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(reg));
writel(val & ~(1 << irq_off),
sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(reg));
}
static void sunxi_irq_unmask(struct irq_data *irqd)
{
unsigned int irq = irqd_to_hwirq(irqd);
unsigned int irq_off = irq % 32;
int reg = irq / 32;
u32 val;
val = readl(sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(reg));
writel(val | (1 << irq_off),
sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(reg));
}
static struct irq_chip sunxi_irq_chip = {
.name = "sunxi_irq",
.irq_ack = sunxi_irq_ack,
.irq_mask = sunxi_irq_mask,
.irq_unmask = sunxi_irq_unmask,
};
static int sunxi_irq_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw)
{
irq_set_chip_and_handler(virq, &sunxi_irq_chip,
handle_level_irq);
set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
return 0;
}
static struct irq_domain_ops sunxi_irq_ops = {
.map = sunxi_irq_map,
.xlate = irq_domain_xlate_onecell,
};
static int __init sunxi_of_init(struct device_node *node,
struct device_node *parent)
{
sunxi_irq_base = of_iomap(node, 0);
if (!sunxi_irq_base)
panic("%s: unable to map IC registers\n",
node->full_name);
/* Disable all interrupts */
writel(0, sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(0));
writel(0, sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(1));
writel(0, sunxi_irq_base + SUNXI_IRQ_ENABLE_REG(2));
/* Mask all the interrupts */
writel(0, sunxi_irq_base + SUNXI_IRQ_MASK_REG(0));
writel(0, sunxi_irq_base + SUNXI_IRQ_MASK_REG(1));
writel(0, sunxi_irq_base + SUNXI_IRQ_MASK_REG(2));
/* Clear all the pending interrupts */
writel(0xffffffff, sunxi_irq_base + SUNXI_IRQ_PENDING_REG(0));
writel(0xffffffff, sunxi_irq_base + SUNXI_IRQ_PENDING_REG(1));
writel(0xffffffff, sunxi_irq_base + SUNXI_IRQ_PENDING_REG(2));
/* Enable protection mode */
writel(0x01, sunxi_irq_base + SUNXI_IRQ_PROTECTION_REG);
/* Configure the external interrupt source type */
writel(0x00, sunxi_irq_base + SUNXI_IRQ_NMI_CTRL_REG);
sunxi_irq_domain = irq_domain_add_linear(node, 3 * 32,
&sunxi_irq_ops, NULL);
if (!sunxi_irq_domain)
panic("%s: unable to create IRQ domain\n", node->full_name);
return 0;
}
static struct of_device_id sunxi_irq_dt_ids[] __initconst = {
{ .compatible = "allwinner,sunxi-ic", .data = sunxi_of_init }
};
void __init sunxi_init_irq(void)
{
of_irq_init(sunxi_irq_dt_ids);
}
asmlinkage void __exception_irq_entry sunxi_handle_irq(struct pt_regs *regs)
{
u32 irq, hwirq;
hwirq = readl(sunxi_irq_base + SUNXI_IRQ_VECTOR_REG) >> 2;
while (hwirq != 0) {
irq = irq_find_mapping(sunxi_irq_domain, hwirq);
handle_IRQ(irq, regs);
hwirq = readl(sunxi_irq_base + SUNXI_IRQ_VECTOR_REG) >> 2;
}
}
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