Commit b5dc7840 authored by Roman Zippel's avatar Roman Zippel Committed by Linus Torvalds

[PATCH] m68k: introduce irq controller

Introduce irq controller and use it to manage auto vector interrupts.
Introduce setup_irq() which can be used for irq setup.
Signed-off-by: default avatarRoman Zippel <zippel@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1d174cfb
......@@ -40,6 +40,7 @@
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/seq_file.h>
......@@ -484,13 +485,10 @@ static irqreturn_t ami_int7(int irq, void *dev_id, struct pt_regs *fp)
}
irqreturn_t (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
[0] = ami_badint,
[1] = ami_int1,
[2] = ami_badint,
[3] = ami_int3,
[4] = ami_int4,
[5] = ami_int5,
[6] = ami_badint,
[7] = ami_int7
};
......
......@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <asm/ptrace.h>
......
......@@ -45,7 +45,15 @@
#endif
/* table for system interrupt handlers */
static irq_handler_t irq_list[SYS_IRQS];
static struct irq_node *irq_list[SYS_IRQS];
static struct irq_controller *irq_controller[SYS_IRQS];
static struct irq_controller auto_irq_controller = {
.name = "auto",
.lock = SPIN_LOCK_UNLOCKED,
.startup = m68k_irq_startup,
.shutdown = m68k_irq_shutdown,
};
static const char *default_names[SYS_IRQS] = {
[0] = "spurious int",
......@@ -101,17 +109,13 @@ void __init init_IRQ(void)
hardirq_mask_is_broken();
}
for (i = 0; i < SYS_IRQS; i++) {
if (mach_default_handler)
irq_list[i].handler = (*mach_default_handler)[i];
irq_list[i].flags = 0;
irq_list[i].dev_id = NULL;
irq_list[i].devname = default_names[i];
for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++) {
irq_controller[i] = &auto_irq_controller;
if (mach_default_handler && (*mach_default_handler)[i])
cpu_request_irq(i, (*mach_default_handler)[i],
0, default_names[i], NULL);
}
for (i = 0; i < NUM_IRQ_NODES; i++)
nodes[i].handler = NULL;
mach_init_IRQ ();
}
......@@ -120,9 +124,12 @@ 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)
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;
......@@ -149,55 +156,115 @@ void free_irq(unsigned int irq, void *dev_id)
EXPORT_SYMBOL(free_irq);
int cpu_request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
int setup_irq(unsigned int irq, struct irq_node *node)
{
if (irq < IRQ_AUTO_1 || irq > IRQ_AUTO_7) {
struct irq_controller *contr;
struct irq_node **prev;
unsigned long flags;
if (irq >= SYS_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d from %s\n",
__FUNCTION__, irq, devname);
__FUNCTION__, irq, node->devname);
return -ENXIO;
}
#if 0
if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
if (irq_list[irq].flags & IRQ_FLG_LOCK) {
printk("%s: IRQ %d from %s is not replaceable\n",
__FUNCTION__, irq, irq_list[irq].devname);
return -EBUSY;
}
if (!(flags & IRQ_FLG_REPLACE)) {
printk("%s: %s can't replace IRQ %d from %s\n",
__FUNCTION__, devname, irq, irq_list[irq].devname);
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 & SA_SHIRQ)) {
spin_unlock_irqrestore(&contr->lock, flags);
return -EBUSY;
}
while (*prev)
prev = &(*prev)->next;
}
#endif
irq_list[irq].handler = handler;
irq_list[irq].flags = flags;
irq_list[irq].dev_id = dev_id;
irq_list[irq].devname = devname;
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 cpu_request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
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;
}
void cpu_free_irq(unsigned int irq, void *dev_id)
{
if (irq < IRQ_AUTO_1 || irq > IRQ_AUTO_7) {
struct irq_controller *contr;
struct irq_node **p, *node;
unsigned long flags;
if (irq >= SYS_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
return;
}
if (irq_list[irq].dev_id != dev_id)
printk("%s: Removing probably wrong IRQ %d from %s\n",
__FUNCTION__, irq, irq_list[irq].devname);
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",
__FUNCTION__, irq);
if (!irq_list[irq])
contr->shutdown(irq);
irq_list[irq].handler = (*mach_default_handler)[irq];
irq_list[irq].flags = 0;
irq_list[irq].dev_id = NULL;
irq_list[irq].devname = default_names[irq];
spin_unlock_irqrestore(&contr->lock, flags);
}
int m68k_irq_startup(unsigned int irq)
{
if (irq <= IRQ_AUTO_7)
vectors[VEC_SPUR + irq] = auto_inthandler;
return 0;
}
void m68k_irq_shutdown(unsigned int irq)
{
if (irq <= IRQ_AUTO_7)
vectors[VEC_SPUR + irq] = bad_inthandler;
}
/*
* Do we need these probe functions on the m68k?
*
......@@ -250,8 +317,14 @@ static void dummy_free_irq(unsigned int irq, void *dev_id)
asmlinkage void m68k_handle_int(unsigned int irq, struct pt_regs *regs)
{
struct irq_node *node;
kstat_cpu(0).irqs[irq]++;
irq_list[irq].handler(irq, irq_list[irq].dev_id, regs);
node = irq_list[irq];
do {
node->handler(irq, node->dev_id, regs);
node = node->next;
} while (node);
}
asmlinkage void handle_badint(struct pt_regs *regs)
......@@ -262,16 +335,18 @@ asmlinkage void handle_badint(struct pt_regs *regs)
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 (i < SYS_IRQS) {
if (mach_default_handler) {
seq_printf(p, "auto %2d: %10u ", i,
i ? kstat_cpu(0).irqs[i] : num_spurious);
seq_puts(p, " ");
seq_printf(p, "%s\n", irq_list[i].devname);
}
if (i < SYS_IRQS && irq_list[i]) {
contr = irq_controller[i];
node = irq_list[i];
seq_printf(p, "%s %u: %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");
} else if (i == SYS_IRQS)
mach_get_irq_list(p, v);
return 0;
......
......@@ -94,20 +94,6 @@ static void mac_sched_init(irqreturn_t (*vector)(int, void *, struct pt_regs *))
via_init_clock(vector);
}
extern irqreturn_t mac_default_handler(int, void *, struct pt_regs *);
irqreturn_t (*mac_handlers[8])(int, void *, struct pt_regs *)=
{
mac_default_handler,
mac_default_handler,
mac_default_handler,
mac_default_handler,
mac_default_handler,
mac_default_handler,
mac_default_handler,
mac_default_handler
};
/*
* Parse a Macintosh-specific record in the bootinfo
*/
......@@ -188,7 +174,6 @@ void __init config_mac(void)
enable_irq = mac_enable_irq;
disable_irq = mac_disable_irq;
mach_get_model = mac_get_model;
mach_default_handler = &mac_handlers;
mach_get_irq_list = show_mac_interrupts;
mach_gettimeoffset = mac_gettimeoffset;
#warning move to adb/via init
......
......@@ -637,13 +637,6 @@ int show_mac_interrupts(struct seq_file *p, void *v)
return 0;
}
void mac_default_handler(int irq, void *dev_id, struct pt_regs *regs)
{
#ifdef DEBUG_SPURIOUS
printk("Unexpected IRQ %d on device %p\n", irq, dev_id);
#endif
}
static int num_debug[8];
irqreturn_t mac_debug_handler(int irq, void *dev_id, struct pt_regs *regs)
......
......@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <asm/ptrace.h>
......
......@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <asm/system.h>
......
......@@ -37,7 +37,6 @@
#include <asm/q40_master.h>
extern irqreturn_t q40_process_int (int level, struct pt_regs *regs);
extern irqreturn_t (*q40_default_handler[]) (int, void *, struct pt_regs *); /* added just for debugging */
extern void q40_init_IRQ (void);
extern void q40_free_irq (unsigned int, void *);
extern int show_q40_interrupts (struct seq_file *, void *);
......@@ -181,7 +180,6 @@ void __init config_q40(void)
mach_request_irq = q40_request_irq;
enable_irq = q40_enable_irq;
disable_irq = q40_disable_irq;
mach_default_handler = &q40_default_handler;
mach_get_model = q40_get_model;
mach_get_hardware_list = q40_get_hardware_list;
......
......@@ -46,7 +46,6 @@ irqreturn_t q40_irq2_handler (int, void *, struct pt_regs *fp);
static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp);
static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs);
#define DEVNAME_SIZE 24
......@@ -415,22 +414,6 @@ static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp)
else master_outb(-1,KEYBOARD_UNLOCK_REG);
return IRQ_NONE;
}
static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs)
{
printk ("Uninitialised interrupt level %d\n", lev);
return IRQ_NONE;
}
irqreturn_t (*q40_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
[0] = default_handler,
[1] = default_handler,
[2] = default_handler,
[3] = default_handler,
[4] = default_handler,
[5] = default_handler,
[6] = default_handler,
[7] = default_handler
};
void q40_enable_irq (unsigned int irq)
......
......@@ -64,6 +64,7 @@
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/elevator.h>
#include <linux/interrupt.h>
#include <asm/setup.h>
#include <asm/uaccess.h>
......
......@@ -3,7 +3,7 @@
#define _atari_stdma_h
#include <asm/irq.h>
#include <linux/interrupt.h>
/***************************** Prototypes *****************************/
......
#ifndef _M68K_IRQ_H_
#define _M68K_IRQ_H_
#include <linux/interrupt.h>
#include <linux/hardirq.h>
#include <linux/spinlock_types.h>
/*
* # of m68k auto vector interrupts
......@@ -81,7 +82,7 @@ extern void (*disable_irq)(unsigned int);
struct pt_regs;
extern int cpu_request_irq(unsigned int,
irqreturn_t (*)(int, void *, struct pt_regs *),
int (*)(int, void *, struct pt_regs *),
unsigned long, const char *, void *);
extern void cpu_free_irq(unsigned int, void *);
......@@ -103,23 +104,35 @@ extern void cpu_free_irq(unsigned int, void *);
* interrupt source (if it supports chaining).
*/
typedef struct irq_node {
irqreturn_t (*handler)(int, void *, struct pt_regs *);
unsigned long flags;
int (*handler)(int, void *, struct pt_regs *);
void *dev_id;
const char *devname;
struct irq_node *next;
unsigned long flags;
const char *devname;
} irq_node_t;
/*
* This structure has only 4 elements for speed reasons
*/
typedef struct irq_handler {
irqreturn_t (*handler)(int, void *, struct pt_regs *);
int (*handler)(int, void *, struct pt_regs *);
unsigned long flags;
void *dev_id;
const char *devname;
} irq_handler_t;
struct irq_controller {
const char *name;
spinlock_t lock;
int (*startup)(unsigned int irq);
void (*shutdown)(unsigned int irq);
void (*enable)(unsigned int irq);
void (*disable)(unsigned int irq);
};
extern int m68k_irq_startup(unsigned int);
extern void m68k_irq_shutdown(unsigned int);
/* count of spurious interrupts */
extern volatile unsigned int num_spurious;
......
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