kernel_optimize_test/arch/arm/mach-omap2/irq.c
김규원 5461af5af5 ARM: OMAP: Mask interrupts when disabling interrupts, v2
By Ingo Molnar, interrupts are not masked by default.
(refer to 76d2160147)

But if interrupts are not masked, the processor can wake up while in
Suspend-to-RAM state by an external interrupt. For example, if an
OMAP3 board is connected to Host PC by USB and entered to Suspend-to-RAM
state, it wake up automatically by M_IRQ_92. The disable_irq() function
can't disable the interrupt in H/W level, So I modified
arch/arm/mach-omap2/irq.c

Signed-off-by: Kim Kyuwon <chammoru@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2009-01-29 09:27:00 -08:00

190 lines
4.5 KiB
C

/*
* linux/arch/arm/mach-omap2/irq.c
*
* Interrupt handler for OMAP2 boards.
*
* Copyright (C) 2005 Nokia Corporation
* Author: Paul Mundt <paul.mundt@nokia.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/mach/irq.h>
/* selected INTC register offsets */
#define INTC_REVISION 0x0000
#define INTC_SYSCONFIG 0x0010
#define INTC_SYSSTATUS 0x0014
#define INTC_SIR 0x0040
#define INTC_CONTROL 0x0048
#define INTC_MIR_CLEAR0 0x0088
#define INTC_MIR_SET0 0x008c
#define INTC_PENDING_IRQ0 0x0098
/* Number of IRQ state bits in each MIR register */
#define IRQ_BITS_PER_REG 32
/*
* OMAP2 has a number of different interrupt controllers, each interrupt
* controller is identified as its own "bank". Register definitions are
* fairly consistent for each bank, but not all registers are implemented
* for each bank.. when in doubt, consult the TRM.
*/
static struct omap_irq_bank {
void __iomem *base_reg;
unsigned int nr_irqs;
} __attribute__ ((aligned(4))) irq_banks[] = {
{
/* MPU INTC */
.base_reg = 0,
.nr_irqs = 96,
},
};
/* INTC bank register get/set */
static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
{
__raw_writel(val, bank->base_reg + reg);
}
static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
{
return __raw_readl(bank->base_reg + reg);
}
static int previous_irq;
/*
* On 34xx we can get occasional spurious interrupts if the ack from
* an interrupt handler does not get posted before we unmask. Warn about
* the interrupt handlers that need to flush posted writes.
*/
static int omap_check_spurious(unsigned int irq)
{
u32 sir, spurious;
sir = intc_bank_read_reg(&irq_banks[0], INTC_SIR);
spurious = sir >> 6;
if (spurious > 1) {
printk(KERN_WARNING "Spurious irq %i: 0x%08x, please flush "
"posted write for irq %i\n",
irq, sir, previous_irq);
return spurious;
}
return 0;
}
/* XXX: FIQ and additional INTC support (only MPU at the moment) */
static void omap_ack_irq(unsigned int irq)
{
intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
}
static void omap_mask_irq(unsigned int irq)
{
int offset = irq & (~(IRQ_BITS_PER_REG - 1));
if (cpu_is_omap34xx()) {
int spurious = 0;
/*
* INT_34XX_GPT12_IRQ is also the spurious irq. Maybe because
* it is the highest irq number?
*/
if (irq == INT_34XX_GPT12_IRQ)
spurious = omap_check_spurious(irq);
if (!spurious)
previous_irq = irq;
}
irq &= (IRQ_BITS_PER_REG - 1);
intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset);
}
static void omap_unmask_irq(unsigned int irq)
{
int offset = irq & (~(IRQ_BITS_PER_REG - 1));
irq &= (IRQ_BITS_PER_REG - 1);
intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_CLEAR0 + offset);
}
static void omap_mask_ack_irq(unsigned int irq)
{
omap_mask_irq(irq);
omap_ack_irq(irq);
}
static struct irq_chip omap_irq_chip = {
.name = "INTC",
.ack = omap_mask_ack_irq,
.mask = omap_mask_irq,
.unmask = omap_unmask_irq,
.disable = omap_mask_irq,
};
static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
{
unsigned long tmp;
tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
printk(KERN_INFO "IRQ: Found an INTC at 0x%p "
"(revision %ld.%ld) with %d interrupts\n",
bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
tmp |= 1 << 1; /* soft reset */
intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);
while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
/* Wait for reset to complete */;
/* Enable autoidle */
intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
}
void __init omap_init_irq(void)
{
unsigned long nr_of_irqs = 0;
unsigned int nr_banks = 0;
int i;
for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
struct omap_irq_bank *bank = irq_banks + i;
if (cpu_is_omap24xx())
bank->base_reg = OMAP2_IO_ADDRESS(OMAP24XX_IC_BASE);
else if (cpu_is_omap34xx())
bank->base_reg = OMAP2_IO_ADDRESS(OMAP34XX_IC_BASE);
omap_irq_bank_init_one(bank);
nr_of_irqs += bank->nr_irqs;
nr_banks++;
}
printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
for (i = 0; i < nr_of_irqs; i++) {
set_irq_chip(i, &omap_irq_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID);
}
}