Linux-2.6.33.2/arch/m68k/kernel/ints.c
/*
* linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
*
* 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.
*
* 07/03/96: Timer initialization, and thus mach_sched_init(),
* removed from request_irq() and moved to init_time().
* We should therefore consider renaming our add_isr() and
* remove_isr() to request_irq() and free_irq()
* respectively, so they are compliant with the other
* architectures. /Jes
* 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls.
* Removed irq list support, if any machine needs an irq server
* it must implement this itself (as it's already done), instead
* only default handler are used with mach_default_handler.
* request_irq got some flags different from other architectures:
* - IRQ_FLG_REPLACE : Replace an existing handler (the default one
* can be replaced without this flag)
* - IRQ_FLG_LOCK : handler can't be replaced
* There are other machine depending flags, see there
* If you want to replace a default handler you should know what
* you're doing, since it might handle different other irq sources
* which must be served /Roman Zippel
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/page.h>
#include <asm/machdep.h>
#include <asm/cacheflush.h>
#include <asm/irq_regs.h>
#ifdef CONFIG_Q40
#include <asm/q40ints.h>
#endif
extern u32 auto_irqhandler_fixup[];
extern u32 user_irqhandler_fixup[];
extern u16 user_irqvec_fixup[];
/* table for system interrupt handlers */
static struct irq_node *irq_list[NR_IRQS];
static struct irq_controller *irq_controller[NR_IRQS];
static int irq_depth[NR_IRQS];
static int m68k_first_user_vec;
static struct irq_controller auto_irq_controller = {
.name = "auto",
.lock = __SPIN_LOCK_UNLOCKED(auto_irq_controller.lock),
.startup = m68k_irq_startup,
.shutdown = m68k_irq_shutdown,
};
static struct irq_controller user_irq_controller = {
.name = "user",
.lock = __SPIN_LOCK_UNLOCKED(user_irq_controller.lock),
.startup = m68k_irq_startup,
.shutdown = m68k_irq_shutdown,
};
#define NUM_IRQ_NODES 100
static irq_node_t nodes[NUM_IRQ_NODES];
/*
* void init_IRQ(void)
*
* Parameters: None
*
* Returns: Nothing
*
* This function should be called during kernel startup to initialize
* the IRQ handling routines.
*/
void __init init_IRQ(void)
{
int i;
/* assembly irq entry code relies on this... */
if (HARDIRQ_MASK != 0x00ff0000) {
extern void hardirq_mask_is_broken(void);
hardirq_mask_is_broken();
}
for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
irq_controller[i] = &auto_irq_controller;
mach_init_IRQ();
}
/**
* m68k_setup_auto_interrupt
* @handler: called from auto vector interrupts
*
* setup the handler to be called from auto vector interrupts instead of the
* standard __m68k_handle_int(), it will be called with irq numbers in the range
* from IRQ_AUTO_1 - IRQ_AUTO_7.
*/
void __init m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *))
{
if (handler)
*auto_irqhandler_fixup = (u32)handler;
flush_icache();
}
/**
* m68k_setup_user_interrupt
* @vec: first user vector interrupt to handle
* @cnt: number of active user vector interrupts
* @handler: called from user vector interrupts
*
* setup user vector interrupts, this includes activating the specified range
* of interrupts, only then these interrupts can be requested (note: this is
* different from auto vector interrupts). An optional handler can be installed
* to be called instead of the default __m68k_handle_int(), it will be called
* with irq numbers starting from IRQ_USER.
*/
void __init m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
void (*handler)(unsigned int, struct pt_regs *))
{
int i;
BUG_ON(IRQ_USER + cnt > NR_IRQS);
m68k_first_user_vec = vec;
for (i = 0; i < cnt; i++)
irq_controller[IRQ_USER + i] = &user_irq_controller;
*user_irqvec_fixup = vec - IRQ_USER;
if (handler)
*user_irqhandler_fixup = (u32)handler;
flush_icache();
}
/**
* m68k_setup_irq_controller
* @contr: irq controller which controls specified irq
* @irq: first irq to be managed by the controller
*
* Change the controller for the specified range of irq, which will be used to
* manage these irq. auto/user irq already have a default controller, which can
* be changed as well, but the controller probably should use m68k_irq_startup/
* m68k_irq_shutdown.
*/
void m68k_setup_irq_controller(struct irq_controller *contr, unsigned int irq,
unsigned int cnt)
{
int i;
for (i = 0; i < cnt; i++)
irq_controller[irq + i] = contr;
}
irq_node_t *new_irq_node(void)
{
irq_node_t *node;
short i;
for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--) {
if (!node->handler) {
memset(node, 0, sizeof(*node));
return node;
}
}
printk ("new_irq_node: out of nodes\n");
return NULL;
}
int setup_irq(unsigned int irq, struct irq_node *node)
{
struct irq_controller *contr;
struct irq_node **prev;
unsigned long flags;
if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d from %s\n",
__func__, irq, node->devname);
return -ENXIO;
}
spin_lock_irqsave(&contr->lock, flags);
prev = irq_list + irq;
if (*prev) {
/* Can't share interrupts unless both agree to */
if (!((*prev)->flags & node->flags & IRQF_SHARED)) {
spin_unlock_irqrestore(&contr->lock, flags);
return -EBUSY;
}
while (*prev)
prev = &(*prev)->next;
}
if (!irq_list[irq]) {
if (contr->startup)
contr->startup(irq);
else
contr->enable(irq);
}
node->next = NULL;
*prev = node;
spin_unlock_irqrestore(&contr->lock, flags);
return 0;
}
int request_irq(unsigned int irq,
irq_handler_t handler,
unsigned long flags, const char *devname, void *dev_id)
{
struct irq_node *node;
int res;
node = new_irq_node();
if (!node)
return -ENOMEM;
node->handler = handler;
node->flags = flags;
node->dev_id = dev_id;
node->devname = devname;
res = setup_irq(irq, node);
if (res)
node->handler = NULL;
return res;
}
EXPORT_SYMBOL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
struct irq_controller *contr;
struct irq_node **p, *node;
unsigned long flags;
if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d\n", __func__, irq);
return;
}
spin_lock_irqsave(&contr->lock, flags);
p = irq_list + irq;
while ((node = *p)) {
if (node->dev_id == dev_id)
break;
p = &node->next;
}
if (node) {
*p = node->next;
node->handler = NULL;
} else
printk("%s: Removing probably wrong IRQ %d\n",
__func__, irq);
if (!irq_list[irq]) {
if (contr->shutdown)
contr->shutdown(irq);
else
contr->disable(irq);
}
spin_unlock_irqrestore(&contr->lock, flags);
}
EXPORT_SYMBOL(free_irq);
void enable_irq(unsigned int irq)
{
struct irq_controller *contr;
unsigned long flags;
if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d\n",
__func__, irq);
return;
}
spin_lock_irqsave(&contr->lock, flags);
if (irq_depth[irq]) {
if (!--irq_depth[irq]) {
if (contr->enable)
contr->enable(irq);
}
} else
WARN_ON(1);
spin_unlock_irqrestore(&contr->lock, flags);
}
EXPORT_SYMBOL(enable_irq);
void disable_irq(unsigned int irq)
{
struct irq_controller *contr;
unsigned long flags;
if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d\n",
__func__, irq);
return;
}
spin_lock_irqsave(&contr->lock, flags);
if (!irq_depth[irq]++) {
if (contr->disable)
contr->disable(irq);
}
spin_unlock_irqrestore(&contr->lock, flags);
}
EXPORT_SYMBOL(disable_irq);
void disable_irq_nosync(unsigned int irq) __attribute__((alias("disable_irq")));
EXPORT_SYMBOL(disable_irq_nosync);
int m68k_irq_startup(unsigned int irq)
{
if (irq <= IRQ_AUTO_7)
vectors[VEC_SPUR + irq] = auto_inthandler;
else
vectors[m68k_first_user_vec + irq - IRQ_USER] = user_inthandler;
return 0;
}
void m68k_irq_shutdown(unsigned int irq)
{
if (irq <= IRQ_AUTO_7)
vectors[VEC_SPUR + irq] = bad_inthandler;
else
vectors[m68k_first_user_vec + irq - IRQ_USER] = bad_inthandler;
}
/*
* Do we need these probe functions on the m68k?
*
* ... may be useful with ISA devices
*/
unsigned long probe_irq_on (void)
{
#ifdef CONFIG_Q40
if (MACH_IS_Q40)
return q40_probe_irq_on();
#endif
return 0;
}
EXPORT_SYMBOL(probe_irq_on);
int probe_irq_off (unsigned long irqs)
{
#ifdef CONFIG_Q40
if (MACH_IS_Q40)
return q40_probe_irq_off(irqs);
#endif
return 0;
}
EXPORT_SYMBOL(probe_irq_off);
unsigned int irq_canonicalize(unsigned int irq)
{
#ifdef CONFIG_Q40
if (MACH_IS_Q40 && irq == 11)
irq = 10;
#endif
return irq;
}
EXPORT_SYMBOL(irq_canonicalize);
asmlinkage void m68k_handle_int(unsigned int irq)
{
struct irq_node *node;
kstat_cpu(0).irqs[irq]++;
node = irq_list[irq];
do {
node->handler(irq, node->dev_id);
node = node->next;
} while (node);
}
asmlinkage void __m68k_handle_int(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs;
old_regs = set_irq_regs(regs);
m68k_handle_int(irq);
set_irq_regs(old_regs);
}
asmlinkage void handle_badint(struct pt_regs *regs)
{
kstat_cpu(0).irqs[0]++;
printk("unexpected interrupt from %u\n", regs->vector);
}
int show_interrupts(struct seq_file *p, void *v)
{
struct irq_controller *contr;
struct irq_node *node;
int i = *(loff_t *) v;
/* autovector interrupts */
if (irq_list[i]) {
contr = irq_controller[i];
node = irq_list[i];
seq_printf(p, "%-8s %3u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname);
while ((node = node->next))
seq_printf(p, ", %s", node->devname);
seq_puts(p, "\n");
}
return 0;
}
#ifdef CONFIG_PROC_FS
void init_irq_proc(void)
{
/* Insert /proc/irq driver here */
}
#endif