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/*
* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 platform IRQ support
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/of_irq.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/mach-jz4740/base.h>
#include <asm/mach-jz4740/irq.h>
#include "irq.h"
#include "../../drivers/irqchip/irqchip.h"
struct ingenic_intc_data {
void __iomem *base;
unsigned num_chips;
};
#define JZ_REG_INTC_STATUS 0x00
#define JZ_REG_INTC_MASK 0x04
#define JZ_REG_INTC_SET_MASK 0x08
#define JZ_REG_INTC_CLEAR_MASK 0x0c
#define JZ_REG_INTC_PENDING 0x10
#define CHIP_SIZE 0x20
static irqreturn_t jz4740_cascade(int irq, void *data)
{
struct ingenic_intc_data *intc = irq_get_handler_data(irq);
uint32_t irq_reg;
unsigned i;
for (i = 0; i < intc->num_chips; i++) {
irq_reg = readl(intc->base + (i * CHIP_SIZE) +
JZ_REG_INTC_PENDING);
if (!irq_reg)
continue;
generic_handle_irq(__fls(irq_reg) + (i * 32) + JZ4740_IRQ_BASE);
}
return IRQ_HANDLED;
}
static void jz4740_irq_set_mask(struct irq_chip_generic *gc, uint32_t mask)
{
struct irq_chip_regs *regs = &gc->chip_types->regs;
writel(mask, gc->reg_base + regs->enable);
writel(~mask, gc->reg_base + regs->disable);
}
void jz4740_irq_suspend(struct irq_data *data)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
jz4740_irq_set_mask(gc, gc->wake_active);
}
void jz4740_irq_resume(struct irq_data *data)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
jz4740_irq_set_mask(gc, gc->mask_cache);
}
static struct irqaction jz4740_cascade_action = {
.handler = jz4740_cascade,
.name = "JZ4740 cascade interrupt",
};
static int __init ingenic_intc_of_init(struct device_node *node,
unsigned num_chips)
{
struct ingenic_intc_data *intc;
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
struct irq_domain *domain;
int parent_irq, err = 0;
unsigned i;
intc = kzalloc(sizeof(*intc), GFP_KERNEL);
if (!intc) {
err = -ENOMEM;
goto out_err;
}
parent_irq = irq_of_parse_and_map(node, 0);
if (!parent_irq) {
err = -EINVAL;
goto out_free;
}
err = irq_set_handler_data(parent_irq, intc);
if (err)
goto out_unmap_irq;
intc->num_chips = num_chips;
intc->base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14);
for (i = 0; i < num_chips; i++) {
/* Mask all irqs */
writel(0xffffffff, intc->base + (i * CHIP_SIZE) +
JZ_REG_INTC_SET_MASK);
gc = irq_alloc_generic_chip("INTC", 1,
JZ4740_IRQ_BASE + (i * 32),
intc->base + (i * CHIP_SIZE),
handle_level_irq);
gc->wake_enabled = IRQ_MSK(32);
ct = gc->chip_types;
ct->regs.enable = JZ_REG_INTC_CLEAR_MASK;
ct->regs.disable = JZ_REG_INTC_SET_MASK;
ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
ct->chip.irq_mask = irq_gc_mask_disable_reg;
ct->chip.irq_mask_ack = irq_gc_mask_disable_reg;
ct->chip.irq_set_wake = irq_gc_set_wake;
ct->chip.irq_suspend = jz4740_irq_suspend;
ct->chip.irq_resume = jz4740_irq_resume;
irq_setup_generic_chip(gc, IRQ_MSK(32), 0, 0,
IRQ_NOPROBE | IRQ_LEVEL);
}
domain = irq_domain_add_legacy(node, num_chips * 32, JZ4740_IRQ_BASE, 0,
&irq_domain_simple_ops, NULL);
if (!domain)
pr_warn("unable to register IRQ domain\n");
setup_irq(parent_irq, &jz4740_cascade_action);
return 0;
out_unmap_irq:
irq_dispose_mapping(parent_irq);
out_free:
kfree(intc);
out_err:
return err;
}
static int __init intc_1chip_of_init(struct device_node *node,
struct device_node *parent)
{
return ingenic_intc_of_init(node, 1);
}
IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", intc_1chip_of_init);
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