/* linux/arch/arm/mach-msm/irq.c
*
* Copyright (C) 2007 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/timer.h>
#include <linux/irq.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/arch/msm_iomap.h>
#define VIC_REG(off) (MSM_VIC_BASE + (off))
#define VIC_INT_SELECT0 VIC_REG(0x0000) /* 1: FIQ, 0: IRQ */
#define VIC_INT_SELECT1 VIC_REG(0x0004) /* 1: FIQ, 0: IRQ */
#define VIC_INT_EN0 VIC_REG(0x0010)
#define VIC_INT_EN1 VIC_REG(0x0014)
#define VIC_INT_ENCLEAR0 VIC_REG(0x0020)
#define VIC_INT_ENCLEAR1 VIC_REG(0x0024)
#define VIC_INT_ENSET0 VIC_REG(0x0030)
#define VIC_INT_ENSET1 VIC_REG(0x0034)
#define VIC_INT_TYPE0 VIC_REG(0x0040) /* 1: EDGE, 0: LEVEL */
#define VIC_INT_TYPE1 VIC_REG(0x0044) /* 1: EDGE, 0: LEVEL */
#define VIC_INT_POLARITY0 VIC_REG(0x0050) /* 1: NEG, 0: POS */
#define VIC_INT_POLARITY1 VIC_REG(0x0054) /* 1: NEG, 0: POS */
#define VIC_NO_PEND_VAL VIC_REG(0x0060)
#define VIC_INT_MASTEREN VIC_REG(0x0064) /* 1: IRQ, 2: FIQ */
#define VIC_PROTECTION VIC_REG(0x006C) /* 1: ENABLE */
#define VIC_CONFIG VIC_REG(0x0068) /* 1: USE ARM1136 VIC */
#define VIC_IRQ_STATUS0 VIC_REG(0x0080)
#define VIC_IRQ_STATUS1 VIC_REG(0x0084)
#define VIC_FIQ_STATUS0 VIC_REG(0x0090)
#define VIC_FIQ_STATUS1 VIC_REG(0x0094)
#define VIC_RAW_STATUS0 VIC_REG(0x00A0)
#define VIC_RAW_STATUS1 VIC_REG(0x00A4)
#define VIC_INT_CLEAR0 VIC_REG(0x00B0)
#define VIC_INT_CLEAR1 VIC_REG(0x00B4)
#define VIC_SOFTINT0 VIC_REG(0x00C0)
#define VIC_SOFTINT1 VIC_REG(0x00C4)
#define VIC_IRQ_VEC_RD VIC_REG(0x00D0) /* pending int # */
#define VIC_IRQ_VEC_PEND_RD VIC_REG(0x00D4) /* pending vector addr */
#define VIC_IRQ_VEC_WR VIC_REG(0x00D8)
#define VIC_IRQ_IN_SERVICE VIC_REG(0x00E0)
#define VIC_IRQ_IN_STACK VIC_REG(0x00E4)
#define VIC_TEST_BUS_SEL VIC_REG(0x00E8)
#define VIC_VECTPRIORITY(n) VIC_REG(0x0200+((n) * 4))
#define VIC_VECTADDR(n) VIC_REG(0x0400+((n) * 4))
static void msm_irq_ack(unsigned int irq)
{
unsigned reg = VIC_INT_CLEAR0 + ((irq & 32) ? 4 : 0);
irq = 1 << (irq & 31);
writel(irq, reg);
}
static void msm_irq_mask(unsigned int irq)
{
unsigned reg = VIC_INT_ENCLEAR0 + ((irq & 32) ? 4 : 0);
writel(1 << (irq & 31), reg);
}
static void msm_irq_unmask(unsigned int irq)
{
unsigned reg = VIC_INT_ENSET0 + ((irq & 32) ? 4 : 0);
writel(1 << (irq & 31), reg);
}
static int msm_irq_set_wake(unsigned int irq, unsigned int on)
{
return -EINVAL;
}
static int msm_irq_set_type(unsigned int irq, unsigned int flow_type)
{
unsigned treg = VIC_INT_TYPE0 + ((irq & 32) ? 4 : 0);
unsigned preg = VIC_INT_POLARITY0 + ((irq & 32) ? 4 : 0);
int b = 1 << (irq & 31);
if (flow_type & (IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW))
writel(readl(preg) | b, preg);
if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_HIGH))
writel(readl(preg) & (~b), preg);
if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
writel(readl(treg) | b, treg);
set_irq_handler(irq, handle_edge_irq);
}
if (flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW)) {
writel(readl(treg) & (~b), treg);
set_irq_handler(irq, handle_level_irq);
}
return 0;
}
static struct irq_chip msm_irq_chip = {
.name = "msm",
.ack = msm_irq_ack,
.mask = msm_irq_mask,
.unmask = msm_irq_unmask,
.set_wake = msm_irq_set_wake,
.set_type = msm_irq_set_type,
};
void __init msm_init_irq(void)
{
unsigned n;
/* select level interrupts */
writel(0, VIC_INT_TYPE0);
writel(0, VIC_INT_TYPE1);
/* select highlevel interrupts */
writel(0, VIC_INT_POLARITY0);
writel(0, VIC_INT_POLARITY1);
/* select IRQ for all INTs */
writel(0, VIC_INT_SELECT0);
writel(0, VIC_INT_SELECT1);
/* disable all INTs */
writel(0, VIC_INT_EN0);
writel(0, VIC_INT_EN1);
/* don't use 1136 vic */
writel(0, VIC_CONFIG);
/* enable interrupt controller */
writel(1, VIC_INT_MASTEREN);
for (n = 0; n < NR_MSM_IRQS; n++) {
set_irq_chip(n, &msm_irq_chip);
set_irq_handler(n, handle_level_irq);
set_irq_flags(n, IRQF_VALID);
}
}
