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[PATCH] CRIS update: IRQ 

Use the generic IRQ framework

Signed-off-by: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mikael Starvik 2005-07-27 11:44:36 -07:00 committed by Linus Torvalds
parent 63245d2cde
commit 2e0cea1dec
6 changed files with 100 additions and 298 deletions
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86
arch/cris/arch-v10/kernel/irq.c
View File

@ -1,4 +1,4 @@
/* $Id: irq.c,v 1.2 2004/06/09 05:30:27 starvik Exp $
/* $Id: irq.c,v 1.4 2005/01/04 12:22:28 starvik Exp $
*
* linux/arch/cris/kernel/irq.c
*
@ -12,11 +12,13 @@
*/
#include <asm/irq.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/config.h>
irqvectptr irq_shortcuts[NR_IRQS]; /* vector of shortcut jumps after the irq prologue */
#define mask_irq(irq_nr) (*R_VECT_MASK_CLR = 1 << (irq_nr));
#define unmask_irq(irq_nr) (*R_VECT_MASK_SET = 1 << (irq_nr));
/* don't use set_int_vector, it bypasses the linux interrupt handlers. it is
* global just so that the kernel gdb can use it.
@ -102,41 +104,52 @@ static void (*interrupt[NR_IRQS])(void) = {
IRQ31_interrupt
};
static void (*bad_interrupt[NR_IRQS])(void) = {
NULL, NULL,
NULL, bad_IRQ3_interrupt,
bad_IRQ4_interrupt, bad_IRQ5_interrupt,
bad_IRQ6_interrupt, bad_IRQ7_interrupt,
bad_IRQ8_interrupt, bad_IRQ9_interrupt,
bad_IRQ10_interrupt, bad_IRQ11_interrupt,
bad_IRQ12_interrupt, bad_IRQ13_interrupt,
NULL, NULL,
bad_IRQ16_interrupt, bad_IRQ17_interrupt,
bad_IRQ18_interrupt, bad_IRQ19_interrupt,
bad_IRQ20_interrupt, bad_IRQ21_interrupt,
bad_IRQ22_interrupt, bad_IRQ23_interrupt,
bad_IRQ24_interrupt, bad_IRQ25_interrupt,
NULL, NULL, NULL, NULL, NULL,
bad_IRQ31_interrupt
static void enable_crisv10_irq(unsigned int irq);
static unsigned int startup_crisv10_irq(unsigned int irq)
{
enable_crisv10_irq(irq);
return 0;
}
#define shutdown_crisv10_irq disable_crisv10_irq
static void enable_crisv10_irq(unsigned int irq)
{
unmask_irq(irq);
}
static void disable_crisv10_irq(unsigned int irq)
{
mask_irq(irq);
}
static void ack_crisv10_irq(unsigned int irq)
{
}
static void end_crisv10_irq(unsigned int irq)
{
}
static struct hw_interrupt_type crisv10_irq_type = {
.typename = "CRISv10",
.startup = startup_crisv10_irq,
.shutdown = shutdown_crisv10_irq,
.enable = enable_crisv10_irq,
.disable = disable_crisv10_irq,
.ack = ack_crisv10_irq,
.end = end_crisv10_irq,
.set_affinity = NULL
};
void arch_setup_irq(int irq)
{
set_int_vector(irq, interrupt[irq]);
}
void arch_free_irq(int irq)
{
set_int_vector(irq, bad_interrupt[irq]);
}
void weird_irq(void);
void system_call(void); /* from entry.S */
void do_sigtrap(void); /* from entry.S */
void gdb_handle_breakpoint(void); /* from entry.S */
/* init_IRQ() is called by start_kernel and is responsible for fixing IRQ masks and
setting the irq vector table to point to bad_interrupt ptrs.
setting the irq vector table.
*/
void __init
@ -154,14 +167,15 @@ init_IRQ(void)
*R_VECT_MASK_CLR = 0xffffffff;
/* clear the shortcut entry points */
for(i = 0; i < NR_IRQS; i++)
irq_shortcuts[i] = NULL;
for (i = 0; i < 256; i++)
etrax_irv->v[i] = weird_irq;
/* Initialize IRQ handler descriptiors. */
for(i = 2; i < NR_IRQS; i++) {
irq_desc[i].handler = &crisv10_irq_type;
set_int_vector(i, interrupt[i]);
}
/* the entries in the break vector contain actual code to be
executed by the associated break handler, rather than just a jump
address. therefore we need to setup a default breakpoint handler
@ -170,10 +184,6 @@ init_IRQ(void)
for (i = 0; i < 16; i++)
set_break_vector(i, do_sigtrap);
/* set all etrax irq's to the bad handlers */
for (i = 2; i < NR_IRQS; i++)
set_int_vector(i, bad_interrupt[i]);
/* except IRQ 15 which is the multiple-IRQ handler on Etrax100 */
set_int_vector(15, multiple_interrupt);

263
arch/cris/kernel/irq.c
View File

@ -12,8 +12,6 @@
* shouldn't result in any weird surprises, and installing new handlers
* should be easier.
*
* Notice Linux/CRIS: these routines do not care about SMP
*
*/
/*
@ -24,6 +22,7 @@
#include <linux/config.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
@ -36,84 +35,56 @@
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/errno.h>
#include <linux/bitops.h>
#include <linux/spinlock.h>
#include <asm/io.h>
/* Defined in arch specific irq.c */
extern void arch_setup_irq(int irq);
extern void arch_free_irq(int irq);
void
disable_irq(unsigned int irq_nr)
void ack_bad_irq(unsigned int irq)
{
unsigned long flags;
local_save_flags(flags);
local_irq_disable();
mask_irq(irq_nr);
local_irq_restore(flags);
printk("unexpected IRQ trap at vector %02x\n", irq);
}
void
enable_irq(unsigned int irq_nr)
{
unsigned long flags;
local_save_flags(flags);
local_irq_disable();
unmask_irq(irq_nr);
local_irq_restore(flags);
}
unsigned long
probe_irq_on()
{
return 0;
}
EXPORT_SYMBOL(probe_irq_on);
int
probe_irq_off(unsigned long x)
{
return 0;
}
EXPORT_SYMBOL(probe_irq_off);
/*
* Initial irq handlers.
*/
static struct irqaction *irq_action[NR_IRQS];
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v;
int i = *(loff_t *) v, j;
struct irqaction * action;
unsigned long flags;
if (i == 0) {
seq_printf(p, " ");
for (j=0; j<NR_CPUS; j++)
if (cpu_online(j))
seq_printf(p, "CPU%d ",j);
seq_putc(p, '\n');
}
if (i < NR_IRQS) {
local_irq_save(flags);
action = irq_action[i];
if (!action)
spin_lock_irqsave(&irq_desc[i].lock, flags);
action = irq_desc[i].action;
if (!action)
goto skip;
seq_printf(p, "%2d: %10u %c %s",
i, kstat_this_cpu.irqs[i],
(action->flags & SA_INTERRUPT) ? '+' : ' ',
action->name);
for (action = action->next; action; action = action->next) {
seq_printf(p, ",%s %s",
(action->flags & SA_INTERRUPT) ? " +" : "",
action->name);
}
seq_printf(p, "%3d: ",i);
#ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i));
#else
for (j = 0; j < NR_CPUS; j++)
if (cpu_online(j))
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
seq_printf(p, " %14s", irq_desc[i].handler->typename);
seq_printf(p, " %s", action->name);
for (action=action->next; action; action = action->next)
seq_printf(p, ", %s", action->name);
seq_putc(p, '\n');
skip:
local_irq_restore(flags);
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
}
return 0;
}
/* called by the assembler IRQ entry functions defined in irq.h
* to dispatch the interrupts to registred handlers
* interrupts are disabled upon entry - depending on if the
@ -123,164 +94,17 @@ skip:
asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
{
struct irqaction *action;
int do_random, cpu;
int ret, retval = 0;
cpu = smp_processor_id();
irq_enter();
kstat_cpu(cpu).irqs[irq - FIRST_IRQ]++;
action = irq_action[irq - FIRST_IRQ];
if (action) {
if (!(action->flags & SA_INTERRUPT))
local_irq_enable();
do_random = 0;
do {
ret = action->handler(irq, action->dev_id, regs);
if (ret == IRQ_HANDLED)
do_random |= action->flags;
retval |= ret;
action = action->next;
} while (action);
if (retval != 1) {
if (retval) {
printk("irq event %d: bogus retval mask %x\n",
irq, retval);
} else {
printk("irq %d: nobody cared\n", irq);
}
}
if (do_random & SA_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
local_irq_disable();
}
unsigned long sp;
irq_enter();
sp = rdsp();
if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
printk("do_IRQ: stack overflow: %lX\n", sp);
show_stack(NULL, (unsigned long *)sp);
}
__do_IRQ(irq, regs);
irq_exit();
}
/* this function links in a handler into the chain of handlers for the
given irq, and if the irq has never been registred, the appropriate
handler is entered into the interrupt vector
*/
int setup_irq(int irq, struct irqaction * new)
{
int shared = 0;
struct irqaction *old, **p;
unsigned long flags;
p = irq_action + irq - FIRST_IRQ;
if ((old = *p) != NULL) {
/* Can't share interrupts unless both agree to */
if (!(old->flags & new->flags & SA_SHIRQ))
return -EBUSY;
/* Can't share interrupts unless both are same type */
if ((old->flags ^ new->flags) & SA_INTERRUPT)
return -EBUSY;
/* add new interrupt at end of irq queue */
do {
p = &old->next;
old = *p;
} while (old);
shared = 1;
}
if (new->flags & SA_SAMPLE_RANDOM)
rand_initialize_irq(irq);
local_save_flags(flags);
local_irq_disable();
*p = new;
if (!shared) {
/* if the irq wasn't registred before, enter it into the vector table
and unmask it physically
*/
arch_setup_irq(irq);
unmask_irq(irq);
}
local_irq_restore(flags);
return 0;
}
/* this function is called by a driver to register an irq handler
Valid flags:
SA_INTERRUPT -> it's a fast interrupt, handler called with irq disabled and
no signal checking etc is performed upon exit
SA_SHIRQ -> the interrupt can be shared between different handlers, the handler
is required to check if the irq was "aimed" at it explicitely
SA_RANDOM -> the interrupt will add to the random generators entropy
*/
int request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags,
const char * devname,
void *dev_id)
{
int retval;
struct irqaction * action;
if(!handler)
return -EINVAL;
/* allocate and fill in a handler structure and setup the irq */
action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
if (!action)
return -ENOMEM;
action->handler = handler;
action->flags = irqflags;
cpus_clear(action->mask);
action->name = devname;
action->next = NULL;
action->dev_id = dev_id;
retval = setup_irq(irq, action);
if (retval)
kfree(action);
return retval;
}
EXPORT_SYMBOL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
struct irqaction * action, **p;
unsigned long flags;
if (irq >= NR_IRQS) {
printk("Trying to free IRQ%d\n",irq);
return;
}
for (p = irq - FIRST_IRQ + irq_action; (action = *p) != NULL; p = &action->next) {
if (action->dev_id != dev_id)
continue;
/* Found it - now free it */
local_save_flags(flags);
local_irq_disable();
*p = action->next;
if (!irq_action[irq - FIRST_IRQ]) {
mask_irq(irq);
arch_free_irq(irq);
}
local_irq_restore(flags);
kfree(action);
return;
}
printk("Trying to free free IRQ%d\n",irq);
}
EXPORT_SYMBOL(free_irq);
void weird_irq(void)
{
local_irq_disable();
@ -288,10 +112,3 @@ void weird_irq(void)
while(1);
}
#if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL)
/* Used by other archs to show/control IRQ steering during SMP */
void __init
init_irq_proc(void)
{
}
#endif

27
include/asm-cris/arch-v10/irq.h
View File

@ -74,12 +74,9 @@ struct etrax_interrupt_vector {
};
extern struct etrax_interrupt_vector *etrax_irv;
void set_int_vector(int n, irqvectptr addr, irqvectptr saddr);
void set_int_vector(int n, irqvectptr addr);
void set_break_vector(int n, irqvectptr addr);
#define mask_irq(irq_nr) (*R_VECT_MASK_CLR = 1 << (irq_nr));
#define unmask_irq(irq_nr) (*R_VECT_MASK_SET = 1 << (irq_nr));
#define __STR(x) #x
#define STR(x) __STR(x)
@ -121,26 +118,17 @@ void set_break_vector(int n, irqvectptr addr);
#define BUILD_IRQ(nr,mask) \
void IRQ_NAME(nr); \
void sIRQ_NAME(nr); \
void BAD_IRQ_NAME(nr); \
__asm__ ( \
".text\n\t" \
"IRQ" #nr "_interrupt:\n\t" \
SAVE_ALL \
"sIRQ" #nr "_interrupt:\n\t" /* shortcut for the multiple irq handler */ \
BLOCK_IRQ(mask,nr) /* this must be done to prevent irq loops when we ei later */ \
"moveq "#nr",$r10\n\t" \
"move.d $sp,$r11\n\t" \
"jsr do_IRQ\n\t" /* irq.c, r10 and r11 are arguments */ \
UNBLOCK_IRQ(mask) \
"moveq 0,$r9\n\t" /* make ret_from_intr realise we came from an irq */ \
"jump ret_from_intr\n\t" \
"bad_IRQ" #nr "_interrupt:\n\t" \
"push $r0\n\t" \
BLOCK_IRQ(mask,nr) \
"pop $r0\n\t" \
"reti\n\t" \
"nop\n");
"jump ret_from_intr\n\t");
/* This is subtle. The timer interrupt is crucial and it should not be disabled for
* too long. However, if it had been a normal interrupt as per BUILD_IRQ, it would
@ -159,23 +147,14 @@ __asm__ ( \
#define BUILD_TIMER_IRQ(nr,mask) \
void IRQ_NAME(nr); \
void sIRQ_NAME(nr); \
void BAD_IRQ_NAME(nr); \
__asm__ ( \
".text\n\t" \
"IRQ" #nr "_interrupt:\n\t" \
SAVE_ALL \
"sIRQ" #nr "_interrupt:\n\t" /* shortcut for the multiple irq handler */ \
"moveq "#nr",$r10\n\t" \
"move.d $sp,$r11\n\t" \
"jsr do_IRQ\n\t" /* irq.c, r10 and r11 are arguments */ \
"moveq 0,$r9\n\t" /* make ret_from_intr realise we came from an irq */ \
"jump ret_from_intr\n\t" \
"bad_IRQ" #nr "_interrupt:\n\t" \
"push $r0\n\t" \
BLOCK_IRQ(mask,nr) \
"pop $r0\n\t" \
"reti\n\t" \
"nop\n");
"jump ret_from_intr\n\t");
#endif

5
include/asm-cris/hardirq.h
View File

@ -1,18 +1,17 @@
#ifndef __ASM_HARDIRQ_H
#define __ASM_HARDIRQ_H
/* only non-SMP supported */
#include <linux/threads.h>
#include <linux/cache.h>
/* entry.S is sensitive to the offsets of these fields */
typedef struct {
unsigned int __softirq_pending;
} ____cacheline_aligned irq_cpustat_t;
#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
void ack_bad_irq(unsigned int irq);
#define HARDIRQ_BITS 8
/*

7
include/asm-cris/hw_irq.h Normal file
View File

@ -0,0 +1,7 @@
#ifndef _ASM_HW_IRQ_H
#define _ASM_HW_IRQ_H
static inline void hw_resend_irq(struct hw_interrupt_type *h, unsigned int i) {}
#endif

10
include/asm-cris/irq.h
View File

@ -8,16 +8,6 @@ extern __inline__ int irq_canonicalize(int irq)
return irq;
}
extern void disable_irq(unsigned int);
extern void enable_irq(unsigned int);
#define disable_irq_nosync disable_irq
#define enable_irq_nosync enable_irq
struct irqaction;
struct pt_regs;
int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);
#endif /* _ASM_IRQ_H */