Commit 752bcb4d authored by GuanXuetao's avatar GuanXuetao

unicore32 core architecture: interrupts ang gpio handling

This patch implements interrupts and gpio handling.
UniCore32 has 9 gpio interrupt sources.
And gpio device operations are also here.
Signed-off-by: default avatarGuan Xuetao <gxt@mprc.pku.edu.cn>
parent 02b2ee16
/*
* linux/arch/unicore32/include/asm/gpio.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __UNICORE_GPIO_H__
#define __UNICORE_GPIO_H__
#include <asm/irq.h>
#include <mach/hardware.h>
#include <asm-generic/gpio.h>
#define GPI_OTP_INT 0
#define GPI_PCI_INTA 1
#define GPI_PCI_INTB 2
#define GPI_PCI_INTC 3
#define GPI_PCI_INTD 4
#define GPI_BAT_DET 5
#define GPI_SD_CD 6
#define GPI_SOFF_REQ 7
#define GPI_SD_WP 8
#define GPI_LCD_CASE_OFF 9
#define GPO_WIFI_EN 10
#define GPO_HDD_LED 11
#define GPO_VGA_EN 12
#define GPO_LCD_EN 13
#define GPO_LED_DATA 14
#define GPO_LED_CLK 15
#define GPO_CAM_PWR_EN 16
#define GPO_LCD_VCC_EN 17
#define GPO_SOFT_OFF 18
#define GPO_BT_EN 19
#define GPO_FAN_ON 20
#define GPO_SPKR 21
#define GPO_SET_V1 23
#define GPO_SET_V2 24
#define GPO_CPU_HEALTH 25
#define GPO_LAN_SEL 26
#ifdef CONFIG_PUV3_NB0916
#define GPI_BTN_TOUCH 14
#define GPIO_IN 0x000043ff /* 1 for input */
#define GPIO_OUT 0x0fffbc00 /* 1 for output */
#endif /* CONFIG_PUV3_NB0916 */
#ifdef CONFIG_PUV3_SMW0919
#define GPIO_IN 0x000003ff /* 1 for input */
#define GPIO_OUT 0x0ffffc00 /* 1 for output */
#endif /* CONFIG_PUV3_SMW0919 */
#ifdef CONFIG_PUV3_DB0913
#define GPIO_IN 0x000001df /* 1 for input */
#define GPIO_OUT 0x03fee800 /* 1 for output */
#endif /* CONFIG_PUV3_DB0913 */
#define GPIO_DIR (~((GPIO_IN) | 0xf0000000))
/* 0 input, 1 output */
static inline int gpio_get_value(unsigned gpio)
{
if (__builtin_constant_p(gpio) && (gpio <= GPIO_MAX))
return GPIO_GPLR & GPIO_GPIO(gpio);
else
return __gpio_get_value(gpio);
}
static inline void gpio_set_value(unsigned gpio, int value)
{
if (__builtin_constant_p(gpio) && (gpio <= GPIO_MAX))
if (value)
GPIO_GPSR = GPIO_GPIO(gpio);
else
GPIO_GPCR = GPIO_GPIO(gpio);
else
__gpio_set_value(gpio, value);
}
#define gpio_cansleep __gpio_cansleep
static inline unsigned gpio_to_irq(unsigned gpio)
{
if ((gpio < IRQ_GPIOHIGH) && (FIELD(1, 1, gpio) & GPIO_GPIR))
return IRQ_GPIOLOW0 + gpio;
else
return IRQ_GPIO0 + gpio;
}
static inline unsigned irq_to_gpio(unsigned irq)
{
if (irq < IRQ_GPIOHIGH)
return irq - IRQ_GPIOLOW0;
else
return irq - IRQ_GPIO0;
}
#endif /* __UNICORE_GPIO_H__ */
/*
* linux/arch/unicore32/include/asm/irq.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __UNICORE_IRQ_H__
#define __UNICORE_IRQ_H__
#include <asm-generic/irq.h>
#define IRQ_GPIOLOW0 0x00
#define IRQ_GPIOLOW1 0x01
#define IRQ_GPIOLOW2 0x02
#define IRQ_GPIOLOW3 0x03
#define IRQ_GPIOLOW4 0x04
#define IRQ_GPIOLOW5 0x05
#define IRQ_GPIOLOW6 0x06
#define IRQ_GPIOLOW7 0x07
#define IRQ_GPIOHIGH 0x08
#define IRQ_USB 0x09
#define IRQ_SDC 0x0a
#define IRQ_AC97 0x0b
#define IRQ_SATA 0x0c
#define IRQ_MME 0x0d
#define IRQ_PCI_BRIDGE 0x0e
#define IRQ_DDR 0x0f
#define IRQ_SPI 0x10
#define IRQ_UNIGFX 0x11
#define IRQ_I2C 0x11
#define IRQ_UART1 0x12
#define IRQ_UART0 0x13
#define IRQ_UMAL 0x14
#define IRQ_NAND 0x15
#define IRQ_PS2_KBD 0x16
#define IRQ_PS2_AUX 0x17
#define IRQ_DMA 0x18
#define IRQ_DMAERR 0x19
#define IRQ_TIMER0 0x1a
#define IRQ_TIMER1 0x1b
#define IRQ_TIMER2 0x1c
#define IRQ_TIMER3 0x1d
#define IRQ_RTC 0x1e
#define IRQ_RTCAlarm 0x1f
#define IRQ_GPIO0 0x20
#define IRQ_GPIO1 0x21
#define IRQ_GPIO2 0x22
#define IRQ_GPIO3 0x23
#define IRQ_GPIO4 0x24
#define IRQ_GPIO5 0x25
#define IRQ_GPIO6 0x26
#define IRQ_GPIO7 0x27
#define IRQ_GPIO8 0x28
#define IRQ_GPIO9 0x29
#define IRQ_GPIO10 0x2a
#define IRQ_GPIO11 0x2b
#define IRQ_GPIO12 0x2c
#define IRQ_GPIO13 0x2d
#define IRQ_GPIO14 0x2e
#define IRQ_GPIO15 0x2f
#define IRQ_GPIO16 0x30
#define IRQ_GPIO17 0x31
#define IRQ_GPIO18 0x32
#define IRQ_GPIO19 0x33
#define IRQ_GPIO20 0x34
#define IRQ_GPIO21 0x35
#define IRQ_GPIO22 0x36
#define IRQ_GPIO23 0x37
#define IRQ_GPIO24 0x38
#define IRQ_GPIO25 0x39
#define IRQ_GPIO26 0x3a
#define IRQ_GPIO27 0x3b
#ifdef CONFIG_ARCH_FPGA
#define IRQ_PCIINTA IRQ_GPIOLOW2
#define IRQ_PCIINTB IRQ_GPIOLOW1
#define IRQ_PCIINTC IRQ_GPIOLOW0
#define IRQ_PCIINTD IRQ_GPIOLOW6
#endif
#if defined(CONFIG_PUV3_DB0913) || defined(CONFIG_PUV3_NB0916) \
|| defined(CONFIG_PUV3_SMW0919)
#define IRQ_PCIINTA IRQ_GPIOLOW1
#define IRQ_PCIINTB IRQ_GPIOLOW2
#define IRQ_PCIINTC IRQ_GPIOLOW3
#define IRQ_PCIINTD IRQ_GPIOLOW4
#endif
#define IRQ_SD_CD IRQ_GPIO6 /* falling or rising trigger */
#ifndef __ASSEMBLY__
struct irqaction;
struct pt_regs;
extern void migrate_irqs(void);
extern void asm_do_IRQ(unsigned int, struct pt_regs *);
#endif
#endif
/*
* linux/arch/unicore32/include/asm/irqflags.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __UNICORE_IRQFLAGS_H__
#define __UNICORE_IRQFLAGS_H__
#ifdef __KERNEL__
#include <asm/ptrace.h>
#define ARCH_IRQ_DISABLED (PRIV_MODE | PSR_I_BIT)
#define ARCH_IRQ_ENABLED (PRIV_MODE)
/*
* Save the current interrupt enable state.
*/
static inline unsigned long arch_local_save_flags(void)
{
unsigned long temp;
asm volatile("mov %0, asr" : "=r" (temp) : : "memory", "cc");
return temp & PSR_c;
}
/*
* restore saved IRQ state
*/
static inline void arch_local_irq_restore(unsigned long flags)
{
unsigned long temp;
asm volatile(
"mov %0, asr\n"
"mov.a asr, %1\n"
"mov.f asr, %0"
: "=&r" (temp)
: "r" (flags)
: "memory", "cc");
}
#include <asm-generic/irqflags.h>
#endif
#endif
/*
* linux/arch/unicore32/kernel/gpio.c
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
* Copyright (C) 2001-2010 Guan Xuetao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/* in FPGA, no GPIO support */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/gpio.h>
#include <mach/hardware.h>
#ifdef CONFIG_LEDS
#include <linux/leds.h>
#include <linux/platform_device.h>
static const struct gpio_led puv3_gpio_leds[] = {
{ .name = "cpuhealth", .gpio = GPO_CPU_HEALTH, .active_low = 0,
.default_trigger = "heartbeat", },
{ .name = "hdd_led", .gpio = GPO_HDD_LED, .active_low = 1,
.default_trigger = "ide-disk", },
};
static const struct gpio_led_platform_data puv3_gpio_led_data = {
.num_leds = ARRAY_SIZE(puv3_gpio_leds),
.leds = (void *) puv3_gpio_leds,
};
static struct platform_device puv3_gpio_gpio_leds = {
.name = "leds-gpio",
.id = -1,
.dev = {
.platform_data = (void *) &puv3_gpio_led_data,
}
};
static int __init puv3_gpio_leds_init(void)
{
platform_device_register(&puv3_gpio_gpio_leds);
return 0;
}
device_initcall(puv3_gpio_leds_init);
#endif
static int puv3_gpio_get(struct gpio_chip *chip, unsigned offset)
{
return GPIO_GPLR & GPIO_GPIO(offset);
}
static void puv3_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
if (value)
GPIO_GPSR = GPIO_GPIO(offset);
else
GPIO_GPCR = GPIO_GPIO(offset);
}
static int puv3_direction_input(struct gpio_chip *chip, unsigned offset)
{
unsigned long flags;
local_irq_save(flags);
GPIO_GPDR &= ~GPIO_GPIO(offset);
local_irq_restore(flags);
return 0;
}
static int puv3_direction_output(struct gpio_chip *chip, unsigned offset,
int value)
{
unsigned long flags;
local_irq_save(flags);
puv3_gpio_set(chip, offset, value);
GPIO_GPDR |= GPIO_GPIO(offset);
local_irq_restore(flags);
return 0;
}
static struct gpio_chip puv3_gpio_chip = {
.label = "gpio",
.direction_input = puv3_direction_input,
.direction_output = puv3_direction_output,
.set = puv3_gpio_set,
.get = puv3_gpio_get,
.base = 0,
.ngpio = GPIO_MAX + 1,
};
void __init puv3_init_gpio(void)
{
GPIO_GPDR = GPIO_DIR;
#if defined(CONFIG_PUV3_NB0916) || defined(CONFIG_PUV3_SMW0919) \
|| defined(CONFIG_PUV3_DB0913)
gpio_set_value(GPO_WIFI_EN, 1);
gpio_set_value(GPO_HDD_LED, 1);
gpio_set_value(GPO_VGA_EN, 1);
gpio_set_value(GPO_LCD_EN, 1);
gpio_set_value(GPO_CAM_PWR_EN, 0);
gpio_set_value(GPO_LCD_VCC_EN, 1);
gpio_set_value(GPO_SOFT_OFF, 1);
gpio_set_value(GPO_BT_EN, 1);
gpio_set_value(GPO_FAN_ON, 0);
gpio_set_value(GPO_SPKR, 0);
gpio_set_value(GPO_CPU_HEALTH, 1);
gpio_set_value(GPO_LAN_SEL, 1);
/*
* DO NOT modify the GPO_SET_V1 and GPO_SET_V2 in kernel
* gpio_set_value(GPO_SET_V1, 1);
* gpio_set_value(GPO_SET_V2, 1);
*/
#endif
gpiochip_add(&puv3_gpio_chip);
}
/*
* linux/arch/unicore32/kernel/irq.c
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/kallsyms.h>
#include <linux/proc_fs.h>
#include <linux/sysdev.h>
#include <linux/gpio.h>
#include <asm/system.h>
#include <mach/hardware.h>
#include "setup.h"
/*
* PKUnity GPIO edge detection for IRQs:
* IRQs are generated on Falling-Edge, Rising-Edge, or both.
* Use this instead of directly setting GRER/GFER.
*/
static int GPIO_IRQ_rising_edge;
static int GPIO_IRQ_falling_edge;
static int GPIO_IRQ_mask = 0;
#define GPIO_MASK(irq) (1 << (irq - IRQ_GPIO0))
static int puv3_gpio_type(unsigned int irq, unsigned int type)
{
unsigned int mask;
if (irq < IRQ_GPIOHIGH)
mask = 1 << irq;
else
mask = GPIO_MASK(irq);
if (type == IRQ_TYPE_PROBE) {
if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
return 0;
type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
}
if (type & IRQ_TYPE_EDGE_RISING)
GPIO_IRQ_rising_edge |= mask;
else
GPIO_IRQ_rising_edge &= ~mask;
if (type & IRQ_TYPE_EDGE_FALLING)
GPIO_IRQ_falling_edge |= mask;
else
GPIO_IRQ_falling_edge &= ~mask;
GPIO_GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
GPIO_GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
return 0;
}
/*
* GPIO IRQs must be acknowledged. This is for IRQs from 0 to 7.
*/
static void puv3_low_gpio_ack(unsigned int irq)
{
GPIO_GEDR = (1 << irq);
}
static void puv3_low_gpio_mask(unsigned int irq)
{
INTC_ICMR &= ~(1 << irq);
}
static void puv3_low_gpio_unmask(unsigned int irq)
{
INTC_ICMR |= 1 << irq;
}
static int puv3_low_gpio_wake(unsigned int irq, unsigned int on)
{
if (on)
PM_PWER |= 1 << irq;
else
PM_PWER &= ~(1 << irq);
return 0;
}
static struct irq_chip puv3_low_gpio_chip = {
.name = "GPIO-low",
.ack = puv3_low_gpio_ack,
.mask = puv3_low_gpio_mask,
.unmask = puv3_low_gpio_unmask,
.set_type = puv3_gpio_type,
.set_wake = puv3_low_gpio_wake,
};
/*
* IRQ8 (GPIO0 through 27) handler. We enter here with the
* irq_controller_lock held, and IRQs disabled. Decode the IRQ
* and call the handler.
*/
static void
puv3_gpio_handler(unsigned int irq, struct irq_desc *desc)
{
unsigned int mask;
mask = GPIO_GEDR;
do {
/*
* clear down all currently active IRQ sources.
* We will be processing them all.
*/
GPIO_GEDR = mask;
irq = IRQ_GPIO0;
do {
if (mask & 1)
generic_handle_irq(irq);
mask >>= 1;
irq++;
} while (mask);
mask = GPIO_GEDR;
} while (mask);
}
/*
* GPIO0-27 edge IRQs need to be handled specially.
* In addition, the IRQs are all collected up into one bit in the
* interrupt controller registers.
*/
static void puv3_high_gpio_ack(unsigned int irq)
{
unsigned int mask = GPIO_MASK(irq);
GPIO_GEDR = mask;
}
static void puv3_high_gpio_mask(unsigned int irq)
{
unsigned int mask = GPIO_MASK(irq);
GPIO_IRQ_mask &= ~mask;
GPIO_GRER &= ~mask;
GPIO_GFER &= ~mask;
}
static void puv3_high_gpio_unmask(unsigned int irq)
{
unsigned int mask = GPIO_MASK(irq);
GPIO_IRQ_mask |= mask;
GPIO_GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
GPIO_GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
}
static int puv3_high_gpio_wake(unsigned int irq, unsigned int on)
{
if (on)
PM_PWER |= PM_PWER_GPIOHIGH;
else
PM_PWER &= ~PM_PWER_GPIOHIGH;
return 0;
}
static struct irq_chip puv3_high_gpio_chip = {
.name = "GPIO-high",
.ack = puv3_high_gpio_ack,
.mask = puv3_high_gpio_mask,
.unmask = puv3_high_gpio_unmask,
.set_type = puv3_gpio_type,
.set_wake = puv3_high_gpio_wake,
};
/*
* We don't need to ACK IRQs on the PKUnity unless they're GPIOs
* this is for internal IRQs i.e. from 8 to 31.
*/
static void puv3_mask_irq(unsigned int irq)
{
INTC_ICMR &= ~(1 << irq);
}
static void puv3_unmask_irq(unsigned int irq)
{
INTC_ICMR |= (1 << irq);
}
/*
* Apart form GPIOs, only the RTC alarm can be a wakeup event.
*/
static int puv3_set_wake(unsigned int irq, unsigned int on)
{
if (irq == IRQ_RTCAlarm) {
if (on)
PM_PWER |= PM_PWER_RTC;
else
PM_PWER &= ~PM_PWER_RTC;
return 0;
}
return -EINVAL;
}
static struct irq_chip puv3_normal_chip = {
.name = "PKUnity-v3",
.ack = puv3_mask_irq,
.mask = puv3_mask_irq,
.unmask = puv3_unmask_irq,
.set_wake = puv3_set_wake,
};
static struct resource irq_resource = {
.name = "irqs",
.start = PKUNITY_INTC_BASE,
.end = PKUNITY_INTC_BASE + 0xFFFFF,
};
static struct puv3_irq_state {
unsigned int saved;
unsigned int icmr;
unsigned int iclr;
unsigned int iccr;
} puv3_irq_state;
static int puv3_irq_suspend(struct sys_device *dev, pm_message_t state)
{
struct puv3_irq_state *st = &puv3_irq_state;
st->saved = 1;
st->icmr = INTC_ICMR;
st->iclr = INTC_ICLR;
st->iccr = INTC_ICCR;
/*
* Disable all GPIO-based interrupts.
*/
INTC_ICMR &= ~(0x1ff);
/*
* Set the appropriate edges for wakeup.
*/
GPIO_GRER = PM_PWER & GPIO_IRQ_rising_edge;
GPIO_GFER = PM_PWER & GPIO_IRQ_falling_edge;
/*
* Clear any pending GPIO interrupts.
*/
GPIO_GEDR = GPIO_GEDR;
return 0;
}
static int puv3_irq_resume(struct sys_device *dev)
{
struct puv3_irq_state *st = &puv3_irq_state;
if (st->saved) {
INTC_ICCR = st->iccr;
INTC_ICLR = st->iclr;
GPIO_GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
GPIO_GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
INTC_ICMR = st->icmr;
}
return 0;
}
static struct sysdev_class puv3_irq_sysclass = {
.name = "pkunity-irq",
.suspend = puv3_irq_suspend,
.resume = puv3_irq_resume,
};
static struct sys_device puv3_irq_device = {
.id = 0,
.cls = &puv3_irq_sysclass,
};
static int __init puv3_irq_init_devicefs(void)
{
sysdev_class_register(&puv3_irq_sysclass);
return sysdev_register(&puv3_irq_device);
}
device_initcall(puv3_irq_init_devicefs);
void __init init_IRQ(void)
{
unsigned int irq;
request_resource(&iomem_resource, &irq_resource);
/* disable all IRQs */
INTC_ICMR = 0;
/* all IRQs are IRQ, not REAL */
INTC_ICLR = 0;
/* clear all GPIO edge detects */
GPIO_GPIR = FMASK(8, 0) & ~FIELD(1, 1, GPI_SOFF_REQ);
GPIO_GFER = 0;
GPIO_GRER = 0;
GPIO_GEDR = 0x0FFFFFFF;
INTC_ICCR = 1;
for (irq = 0; irq < IRQ_GPIOHIGH; irq++) {
set_irq_chip(irq, &puv3_low_gpio_chip);
set_irq_handler(irq, handle_edge_irq);
irq_modify_status(irq,
IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN,
0);
}
for (irq = IRQ_GPIOHIGH + 1; irq < IRQ_GPIO0; irq++) {
set_irq_chip(irq, &puv3_normal_chip);
set_irq_handler(irq, handle_level_irq);
irq_modify_status(irq,
IRQ_NOREQUEST | IRQ_NOAUTOEN,
IRQ_NOPROBE);
}
for (irq = IRQ_GPIO0; irq <= IRQ_GPIO27; irq++) {
set_irq_chip(irq, &puv3_high_gpio_chip);
set_irq_handler(irq, handle_edge_irq);
irq_modify_status(irq,
IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN,
0);
}
/*
* Install handler for GPIO 0-27 edge detect interrupts
*/
set_irq_chip(IRQ_GPIOHIGH, &puv3_normal_chip);
set_irq_chained_handler(IRQ_GPIOHIGH, puv3_gpio_handler);
#ifdef CONFIG_PUV3_GPIO
puv3_init_gpio();
#endif
}
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, cpu;
struct irq_desc *desc;
struct irqaction *action;
unsigned long flags;
if (i == 0) {
char cpuname[12];
seq_printf(p, " ");
for_each_present_cpu(cpu) {
sprintf(cpuname, "CPU%d", cpu);
seq_printf(p, " %10s", cpuname);
}
seq_putc(p, '\n');
}
if (i < nr_irqs) {
desc = irq_to_desc(i);
raw_spin_lock_irqsave(&desc->lock, flags);
action = desc->action;
if (!action)
goto unlock;
seq_printf(p, "%3d: ", i);
for_each_present_cpu(cpu)
seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu));
seq_printf(p, " %10s", desc->chip->name ? : "-");
seq_printf(p, " %s", action->name);
for (action = action->next; action; action = action->next)
seq_printf(p, ", %s", action->name);
seq_putc(p, '\n');
unlock:
raw_spin_unlock_irqrestore(&desc->lock, flags);
} else if (i == nr_irqs) {
seq_printf(p, "Error in interrupt!\n");
}
return 0;
}
/*
* do_IRQ handles all hardware IRQ's. Decoded IRQs should not
* come via this function. Instead, they should provide their
* own 'handler'
*/
asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
irq_enter();
/*
* Some hardware gives randomly wrong interrupts. Rather
* than crashing, do something sensible.
*/
if (unlikely(irq >= nr_irqs)) {
if (printk_ratelimit())
printk(KERN_WARNING "Bad IRQ%u\n", irq);
ack_bad_irq(irq);
} else {
generic_handle_irq(irq);
}
irq_exit();
set_irq_regs(old_regs);
}
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