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/*
* arch/arm/mach-vt8500/irq.c
*
* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/irq.h>
#include "devices.h"
#define VT8500_IC_DCTR 0x40 /* Destination control
register, 64*u8 */
#define VT8500_INT_ENABLE (1 << 3)
#define VT8500_TRIGGER_HIGH (0 << 4)
#define VT8500_TRIGGER_RISING (1 << 4)
#define VT8500_TRIGGER_FALLING (2 << 4)
#define VT8500_EDGE ( VT8500_TRIGGER_RISING \
| VT8500_TRIGGER_FALLING)
#define VT8500_IC_STATUS 0x80 /* Interrupt status, 2*u32 */
static void __iomem *ic_regbase;
static void __iomem *sic_regbase;
static void vt8500_irq_mask(unsigned int irq)
{
void __iomem *base = ic_regbase;
u8 edge;
if (irq >= 64) {
base = sic_regbase;
irq -= 64;
}
edge = readb(base + VT8500_IC_DCTR + irq) & VT8500_EDGE;
if (edge) {
void __iomem *stat_reg = base + VT8500_IC_STATUS
+ (irq < 32 ? 0 : 4);
unsigned status = readl(stat_reg);
status |= (1 << (irq & 0x1f));
writel(status, stat_reg);
} else {
u8 dctr = readb(base + VT8500_IC_DCTR + irq);
dctr &= ~VT8500_INT_ENABLE;
writeb(dctr, base + VT8500_IC_DCTR + irq);
}
}
static void vt8500_irq_unmask(unsigned int irq)
{
void __iomem *base = ic_regbase;
u8 dctr;
if (irq >= 64) {
base = sic_regbase;
irq -= 64;
}
dctr = readb(base + VT8500_IC_DCTR + irq);
dctr |= VT8500_INT_ENABLE;
writeb(dctr, base + VT8500_IC_DCTR + irq);
}
static int vt8500_irq_set_type(unsigned int irq, unsigned int flow_type)
{
void __iomem *base = ic_regbase;
unsigned int orig_irq = irq;
u8 dctr;
if (irq >= 64) {
base = sic_regbase;
irq -= 64;
}
dctr = readb(base + VT8500_IC_DCTR + irq);
dctr &= ~VT8500_EDGE;
switch (flow_type) {
case IRQF_TRIGGER_LOW:
return -EINVAL;
case IRQF_TRIGGER_HIGH:
dctr |= VT8500_TRIGGER_HIGH;
irq_desc[orig_irq].handle_irq = handle_level_irq;
break;
case IRQF_TRIGGER_FALLING:
dctr |= VT8500_TRIGGER_FALLING;
irq_desc[orig_irq].handle_irq = handle_edge_irq;
break;
case IRQF_TRIGGER_RISING:
dctr |= VT8500_TRIGGER_RISING;
irq_desc[orig_irq].handle_irq = handle_edge_irq;
break;
}
writeb(dctr, base + VT8500_IC_DCTR + irq);
return 0;
}
static struct irq_chip vt8500_irq_chip = {
.name = "vt8500",
.ack = vt8500_irq_mask,
.mask = vt8500_irq_mask,
.unmask = vt8500_irq_unmask,
.set_type = vt8500_irq_set_type,
};
void __init vt8500_init_irq(void)
{
unsigned int i;
ic_regbase = ioremap(wmt_ic_base, SZ_64K);
if (ic_regbase) {
/* Enable rotating priority for IRQ */
writel((1 << 6), ic_regbase + 0x20);
writel(0, ic_regbase + 0x24);
for (i = 0; i < wmt_nr_irqs; i++) {
/* Disable all interrupts and route them to IRQ */
writeb(0x00, ic_regbase + VT8500_IC_DCTR + i);
set_irq_chip(i, &vt8500_irq_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID);
}
} else {
printk(KERN_ERR "Unable to remap the Interrupt Controller registers, not enabling IRQs!\n");
}
}
void __init wm8505_init_irq(void)
{
unsigned int i;
ic_regbase = ioremap(wmt_ic_base, SZ_64K);
sic_regbase = ioremap(wmt_sic_base, SZ_64K);
if (ic_regbase && sic_regbase) {
/* Enable rotating priority for IRQ */
writel((1 << 6), ic_regbase + 0x20);
writel(0, ic_regbase + 0x24);
writel((1 << 6), sic_regbase + 0x20);
writel(0, sic_regbase + 0x24);
for (i = 0; i < wmt_nr_irqs; i++) {
/* Disable all interrupts and route them to IRQ */
if (i < 64)
writeb(0x00, ic_regbase + VT8500_IC_DCTR + i);
else
writeb(0x00, sic_regbase + VT8500_IC_DCTR
+ i - 64);
set_irq_chip(i, &vt8500_irq_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID);
}
} else {
printk(KERN_ERR "Unable to remap the Interrupt Controller registers, not enabling IRQs!\n");
}
}
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