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linux/arch/arm/mach-omap1/irq.c

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/*
* linux/arch/arm/mach-omap1/irq.c
*
* Interrupt handler for all OMAP boards
*
* Copyright (C) 2004 Nokia Corporation
* Written by Tony Lindgren <tony@atomide.com>
* Major cleanups by Juha Yrjölä <juha.yrjola@nokia.com>
*
* Completely re-written to support various OMAP chips with bank specific
* interrupt handlers.
*
* Some snippets of the code taken from the older OMAP interrupt handler
* Copyright (C) 2001 RidgeRun, Inc. Greg Lonnon <glonnon@ridgerun.com>
*
* GPIO interrupt handler moved to gpio.c by Juha Yrjola
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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/config.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/arch/gpio.h>
#include <asm/arch/cpu.h>
#include <asm/io.h>
#define IRQ_BANK(irq) ((irq) >> 5)
#define IRQ_BIT(irq) ((irq) & 0x1f)
struct omap_irq_bank {
unsigned long base_reg;
unsigned long trigger_map;
unsigned long wake_enable;
};
static unsigned int irq_bank_count = 0;
static struct omap_irq_bank *irq_banks;
static inline unsigned int irq_bank_readl(int bank, int offset)
{
return omap_readl(irq_banks[bank].base_reg + offset);
}
static inline void irq_bank_writel(unsigned long value, int bank, int offset)
{
omap_writel(value, irq_banks[bank].base_reg + offset);
}
static void omap_ack_irq(unsigned int irq)
{
if (irq > 31)
omap_writel(0x1, OMAP_IH2_BASE + IRQ_CONTROL_REG_OFFSET);
omap_writel(0x1, OMAP_IH1_BASE + IRQ_CONTROL_REG_OFFSET);
}
static void omap_mask_irq(unsigned int irq)
{
int bank = IRQ_BANK(irq);
u32 l;
l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
l |= 1 << IRQ_BIT(irq);
omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
}
static void omap_unmask_irq(unsigned int irq)
{
int bank = IRQ_BANK(irq);
u32 l;
l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
l &= ~(1 << IRQ_BIT(irq));
omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
}
static void omap_mask_ack_irq(unsigned int irq)
{
omap_mask_irq(irq);
omap_ack_irq(irq);
}
static int omap_wake_irq(unsigned int irq, unsigned int enable)
{
int bank = IRQ_BANK(irq);
if (enable)
irq_banks[bank].wake_enable |= IRQ_BIT(irq);
else
irq_banks[bank].wake_enable &= ~IRQ_BIT(irq);
return 0;
}
/*
* Allows tuning the IRQ type and priority
*
* NOTE: There is currently no OMAP fiq handler for Linux. Read the
* mailing list threads on FIQ handlers if you are planning to
* add a FIQ handler for OMAP.
*/
static void omap_irq_set_cfg(int irq, int fiq, int priority, int trigger)
{
signed int bank;
unsigned long val, offset;
bank = IRQ_BANK(irq);
/* FIQ is only available on bank 0 interrupts */
fiq = bank ? 0 : (fiq & 0x1);
val = fiq | ((priority & 0x1f) << 2) | ((trigger & 0x1) << 1);
offset = IRQ_ILR0_REG_OFFSET + IRQ_BIT(irq) * 0x4;
irq_bank_writel(val, bank, offset);
}
#ifdef CONFIG_ARCH_OMAP730
static struct omap_irq_bank omap730_irq_banks[] = {
{ .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3f8e22f },
{ .base_reg = OMAP_IH2_BASE, .trigger_map = 0xfdb9c1f2 },
{ .base_reg = OMAP_IH2_BASE + 0x100, .trigger_map = 0x800040f3 },
};
#endif
#ifdef CONFIG_ARCH_OMAP15XX
static struct omap_irq_bank omap1510_irq_banks[] = {
{ .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3febfff },
{ .base_reg = OMAP_IH2_BASE, .trigger_map = 0xffbfffed },
};
static struct omap_irq_bank omap310_irq_banks[] = {
{ .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3faefc3 },
{ .base_reg = OMAP_IH2_BASE, .trigger_map = 0x65b3c061 },
};
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
static struct omap_irq_bank omap1610_irq_banks[] = {
{ .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3fefe8f },
{ .base_reg = OMAP_IH2_BASE, .trigger_map = 0xfdb7c1fd },
{ .base_reg = OMAP_IH2_BASE + 0x100, .trigger_map = 0xffffb7ff },
{ .base_reg = OMAP_IH2_BASE + 0x200, .trigger_map = 0xffffffff },
};
#endif
static struct irqchip omap_irq_chip = {
.ack = omap_mask_ack_irq,
.mask = omap_mask_irq,
.unmask = omap_unmask_irq,
.set_wake = omap_wake_irq,
};
void __init omap_init_irq(void)
{
int i, j;
#ifdef CONFIG_ARCH_OMAP730
if (cpu_is_omap730()) {
irq_banks = omap730_irq_banks;
irq_bank_count = ARRAY_SIZE(omap730_irq_banks);
}
#endif
#ifdef CONFIG_ARCH_OMAP15XX
if (cpu_is_omap1510()) {
irq_banks = omap1510_irq_banks;
irq_bank_count = ARRAY_SIZE(omap1510_irq_banks);
}
if (cpu_is_omap310()) {
irq_banks = omap310_irq_banks;
irq_bank_count = ARRAY_SIZE(omap310_irq_banks);
}
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
if (cpu_is_omap16xx()) {
irq_banks = omap1610_irq_banks;
irq_bank_count = ARRAY_SIZE(omap1610_irq_banks);
}
#endif
printk("Total of %i interrupts in %i interrupt banks\n",
irq_bank_count * 32, irq_bank_count);
/* Mask and clear all interrupts */
for (i = 0; i < irq_bank_count; i++) {
irq_bank_writel(~0x0, i, IRQ_MIR_REG_OFFSET);
irq_bank_writel(0x0, i, IRQ_ITR_REG_OFFSET);
}
/* Clear any pending interrupts */
irq_bank_writel(0x03, 0, IRQ_CONTROL_REG_OFFSET);
irq_bank_writel(0x03, 1, IRQ_CONTROL_REG_OFFSET);
/* Enable interrupts in global mask */
if (cpu_is_omap730()) {
irq_bank_writel(0x0, 0, IRQ_GMR_REG_OFFSET);
}
/* Install the interrupt handlers for each bank */
for (i = 0; i < irq_bank_count; i++) {
for (j = i * 32; j < (i + 1) * 32; j++) {
int irq_trigger;
irq_trigger = irq_banks[i].trigger_map >> IRQ_BIT(j);
omap_irq_set_cfg(j, 0, 0, irq_trigger);
set_irq_chip(j, &omap_irq_chip);
set_irq_handler(j, do_level_IRQ);
set_irq_flags(j, IRQF_VALID);
}
}
/* Unmask level 2 handler */
if (cpu_is_omap730())
omap_unmask_irq(INT_730_IH2_IRQ);
else if (cpu_is_omap1510())
omap_unmask_irq(INT_1510_IH2_IRQ);
else if (cpu_is_omap16xx())
omap_unmask_irq(INT_1610_IH2_IRQ);
}
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