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[PATCH] m68k: convert generic irq code to irq controller

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Convert the generic irq code to use irq controller, this gets rid of the
machine specific callbacks and gives better control over irq handling without
duplicating lots of code.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roman Zippel 2006-06-25 05:47:01 -07:00 committed by Linus Torvalds
parent b5dc7840b3
commit 68387c448b
8 changed files with 188 additions and 148 deletions
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11
arch/m68k/kernel/entry.S
View File

@ -48,6 +48,8 @@
.globl sys_call_table
.globl sys_fork, sys_clone, sys_vfork
.globl ret_from_interrupt, bad_interrupt
.globl auto_irqhandler_fixup
.globl user_irqvec_fixup, user_irqhandler_fixup
.text
ENTRY(buserr)
@ -212,6 +214,7 @@ ENTRY(auto_inthandler)
jbra 3f
1:
#endif
auto_irqhandler_fixup = . + 2
jsr m68k_handle_int | process the IRQ
3: addql #8,%sp | pop parameters off stack
@ -234,17 +237,19 @@ ret_from_last_interrupt:
/* Handler for user defined interrupt vectors */
ENTRY(mach_inthandler)
ENTRY(user_inthandler)
SAVE_ALL_INT
GET_CURRENT(%d0)
addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)
| put exception # in d0
bfextu %sp@(PT_VECTOR){#4,#10},%d0
user_irqvec_fixup = . + 2
subw #VEC_USER,%d0
movel %sp,%sp@-
movel %d0,%sp@- | put vector # on stack
movel mach_process_int,%a0
jsr %a0@ | process the IRQ
user_irqhandler_fixup = . + 2
jsr m68k_handle_int | process the IRQ
addql #8,%sp | pop parameters off stack
subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+1)

240
arch/m68k/kernel/ints.c
View File

@ -39,14 +39,22 @@
#include <asm/traps.h>
#include <asm/page.h>
#include <asm/machdep.h>
#include <asm/cacheflush.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[SYS_IRQS];
static struct irq_controller *irq_controller[SYS_IRQS];
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",
@ -55,39 +63,16 @@ static struct irq_controller auto_irq_controller = {
.shutdown = m68k_irq_shutdown,
};
static const char *default_names[SYS_IRQS] = {
[0] = "spurious int",
[1] = "int1 handler",
[2] = "int2 handler",
[3] = "int3 handler",
[4] = "int4 handler",
[5] = "int5 handler",
[6] = "int6 handler",
[7] = "int7 handler"
static struct irq_controller user_irq_controller = {
.name = "user",
.lock = SPIN_LOCK_UNLOCKED,
.startup = m68k_irq_startup,
.shutdown = m68k_irq_shutdown,
};
/* The number of spurious interrupts */
volatile unsigned int num_spurious;
#define NUM_IRQ_NODES 100
static irq_node_t nodes[NUM_IRQ_NODES];
static void dummy_enable_irq(unsigned int irq);
static void dummy_disable_irq(unsigned int irq);
static int dummy_request_irq(unsigned int irq,
irqreturn_t (*handler) (int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id);
static void dummy_free_irq(unsigned int irq, void *dev_id);
void (*enable_irq) (unsigned int) = dummy_enable_irq;
void (*disable_irq) (unsigned int) = dummy_disable_irq;
int (*mach_request_irq) (unsigned int, irqreturn_t (*)(int, void *, struct pt_regs *),
unsigned long, const char *, void *) = dummy_request_irq;
void (*mach_free_irq) (unsigned int, void *) = dummy_free_irq;
void init_irq_proc(void);
/*
* void init_IRQ(void)
*
@ -109,14 +94,70 @@ void __init init_IRQ(void)
hardirq_mask_is_broken();
}
for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; 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);
}
mach_init_IRQ ();
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;
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)
@ -135,34 +176,13 @@ irq_node_t *new_irq_node(void)
return NULL;
}
/*
* We will keep these functions until I have convinced Linus to move
* the declaration of them from include/linux/sched.h to
* include/asm/irq.h.
*/
int request_irq(unsigned int irq,
irqreturn_t (*handler) (int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
return mach_request_irq(irq, handler, flags, devname, dev_id);
}
EXPORT_SYMBOL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
mach_free_irq(irq, dev_id);
}
EXPORT_SYMBOL(free_irq);
int setup_irq(unsigned int irq, struct irq_node *node)
{
struct irq_controller *contr;
struct irq_node **prev;
unsigned long flags;
if (irq >= SYS_IRQS || !(contr = irq_controller[irq])) {
if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d from %s\n",
__FUNCTION__, irq, node->devname);
return -ENXIO;
@ -195,9 +215,9 @@ int setup_irq(unsigned int irq, struct irq_node *node)
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)
int 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;
@ -218,13 +238,15 @@ int cpu_request_irq(unsigned int irq,
return res;
}
void cpu_free_irq(unsigned int irq, void *dev_id)
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 >= SYS_IRQS || !(contr = irq_controller[irq])) {
if (irq >= NR_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
return;
}
@ -245,16 +267,69 @@ void cpu_free_irq(unsigned int irq, void *dev_id)
printk("%s: Removing probably wrong IRQ %d\n",
__FUNCTION__, irq);
if (!irq_list[irq])
contr->shutdown(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",
__FUNCTION__, 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",
__FUNCTION__, 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);
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;
}
@ -262,6 +337,8 @@ 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;
}
@ -292,28 +369,16 @@ int probe_irq_off (unsigned long irqs)
EXPORT_SYMBOL(probe_irq_off);
static void dummy_enable_irq(unsigned int irq)
unsigned int irq_canonicalize(unsigned int irq)
{
printk("calling uninitialized enable_irq()\n");
#ifdef CONFIG_Q40
if (MACH_IS_Q40 && irq == 11)
irq = 10;
#endif
return irq;
}
static void dummy_disable_irq(unsigned int irq)
{
printk("calling uninitialized disable_irq()\n");
}
static int dummy_request_irq(unsigned int irq,
irqreturn_t (*handler) (int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
printk("calling uninitialized request_irq()\n");
return 0;
}
static void dummy_free_irq(unsigned int irq, void *dev_id)
{
printk("calling uninitialized disable_irq()\n");
}
EXPORT_SYMBOL(irq_canonicalize);
asmlinkage void m68k_handle_int(unsigned int irq, struct pt_regs *regs)
{
@ -340,15 +405,14 @@ int show_interrupts(struct seq_file *p, void *v)
int i = *(loff_t *) v;
/* autovector interrupts */
if (i < SYS_IRQS && irq_list[i]) {
if (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);
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");
} else if (i == SYS_IRQS)
mach_get_irq_list(p, v);
}
return 0;
}

2
arch/m68k/kernel/m68k_ksyms.c
View File

@ -57,8 +57,6 @@ EXPORT_SYMBOL(dump_thread);
EXPORT_SYMBOL(strnlen);
EXPORT_SYMBOL(strrchr);
EXPORT_SYMBOL(strstr);
EXPORT_SYMBOL(enable_irq);
EXPORT_SYMBOL(disable_irq);
EXPORT_SYMBOL(kernel_thread);
#ifdef CONFIG_VME
EXPORT_SYMBOL(vme_brdtype);

3
arch/m68k/kernel/setup.c
View File

@ -68,11 +68,8 @@ char m68k_debug_device[6] = "";
void (*mach_sched_init) (irqreturn_t (*handler)(int, void *, struct pt_regs *)) __initdata = NULL;
/* machine dependent irq functions */
void (*mach_init_IRQ) (void) __initdata = NULL;
irqreturn_t (*(*mach_default_handler)[]) (int, void *, struct pt_regs *);
void (*mach_get_model) (char *model);
int (*mach_get_hardware_list) (char *buffer);
int (*mach_get_irq_list) (struct seq_file *, void *);
irqreturn_t (*mach_process_int) (int, struct pt_regs *);
/* machine dependent timer functions */
unsigned long (*mach_gettimeoffset) (void);
int (*mach_hwclk) (int, struct rtc_time*);

7
arch/m68k/kernel/traps.c
View File

@ -87,16 +87,15 @@ void __init trap_init (void)
{
int i;
vectors[VEC_SPUR] = bad_inthandler;
for (i = VEC_INT1; i <= VEC_INT7; i++)
vectors[i] = auto_inthandler;
for (i = VEC_SPUR; i <= VEC_INT7; i++)
vectors[i] = bad_inthandler;
for (i = 0; i < VEC_USER; i++)
if (!vectors[i])
vectors[i] = trap;
for (i = VEC_USER; i < 256; i++)
vectors[i] = mach_inthandler;
vectors[i] = bad_inthandler;
#ifdef CONFIG_M68KFPU_EMU
if (FPU_IS_EMU)

65
include/asm-m68k/irq.h
View File

@ -1,25 +1,30 @@
#ifndef _M68K_IRQ_H_
#define _M68K_IRQ_H_
#include <linux/linkage.h>
#include <linux/hardirq.h>
#include <linux/spinlock_types.h>
/*
* # of m68k auto vector interrupts
*/
#define SYS_IRQS 8
/*
* This should be the same as the max(NUM_X_SOURCES) for all the
* different m68k hosts compiled into the kernel.
* Currently the Atari has 72 and the Amiga 24, but if both are
* supported in the kernel it is better to make room for 72.
*/
#if defined(CONFIG_ATARI) || defined(CONFIG_MAC)
#define NR_IRQS (72+SYS_IRQS)
#if defined(CONFIG_VME) || defined(CONFIG_SUN3) || defined(CONFIG_SUN3X)
#define NR_IRQS 200
#elif defined(CONFIG_ATARI) || defined(CONFIG_MAC)
#define NR_IRQS 72
#elif defined(CONFIG_Q40)
#define NR_IRQS 43
#elif defined(CONFIG_AMIGA)
#define NR_IRQS 32
#elif defined(CONFIG_APOLLO)
#define NR_IRQS 24
#elif defined(CONFIG_HP300)
#define NR_IRQS 8
#else
#define NR_IRQS (24+SYS_IRQS)
#error unknown nr of irqs
#endif
/*
@ -53,39 +58,13 @@
#define IRQ_USER 8
static __inline__ int irq_canonicalize(int irq)
{
return irq;
}
/*
* Machine specific interrupt sources.
*
* Adding an interrupt service routine for a source with this bit
* set indicates a special machine specific interrupt source.
* The machine specific files define these sources.
*
* The IRQ_MACHSPEC bit is now gone - the only thing it did was to
* introduce unnecessary overhead.
*
* All interrupt handling is actually machine specific so it is better
* to use function pointers, as used by the Sparc port, and select the
* interrupt handling functions when initializing the kernel. This way
* we save some unnecessary overhead at run-time.
* 01/11/97 - Jes
*/
extern void (*enable_irq)(unsigned int);
extern void (*disable_irq)(unsigned int);
extern unsigned int irq_canonicalize(unsigned int irq);
extern void enable_irq(unsigned int);
extern void disable_irq(unsigned int);
#define disable_irq_nosync disable_irq
struct pt_regs;
extern int cpu_request_irq(unsigned int,
int (*)(int, void *, struct pt_regs *),
unsigned long, const char *, void *);
extern void cpu_free_irq(unsigned int, void *);
/*
* various flags for request_irq() - the Amiga now uses the standard
* mechanism like all other architectures - SA_INTERRUPT and SA_SHIRQ
@ -133,12 +112,16 @@ struct irq_controller {
extern int m68k_irq_startup(unsigned int);
extern void m68k_irq_shutdown(unsigned int);
/* count of spurious interrupts */
extern volatile unsigned int num_spurious;
/*
* This function returns a new irq_node_t
*/
extern irq_node_t *new_irq_node(void);
extern void m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *));
extern void m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
void (*handler)(unsigned int, struct pt_regs *));
extern void m68k_setup_irq_controller(struct irq_controller *, unsigned int, unsigned int);
asmlinkage void m68k_handle_int(unsigned int, struct pt_regs *);
#endif /* _M68K_IRQ_H_ */

6
include/asm-m68k/machdep.h
View File

@ -13,14 +13,8 @@ struct buffer_head;
extern void (*mach_sched_init) (irqreturn_t (*handler)(int, void *, struct pt_regs *));
/* machine dependent irq functions */
extern void (*mach_init_IRQ) (void);
extern irqreturn_t (*(*mach_default_handler)[]) (int, void *, struct pt_regs *);
extern int (*mach_request_irq) (unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id);
extern void (*mach_free_irq) (unsigned int irq, void *dev_id);
extern void (*mach_get_model) (char *model);
extern int (*mach_get_hardware_list) (char *buffer);
extern int (*mach_get_irq_list) (struct seq_file *p, void *v);
extern irqreturn_t (*mach_process_int) (int irq, struct pt_regs *fp);
/* machine dependent timer functions */
extern unsigned long (*mach_gettimeoffset)(void);
extern int (*mach_hwclk)(int, struct rtc_time*);

2
include/asm-m68k/traps.h
View File

@ -19,7 +19,7 @@
typedef void (*e_vector)(void);
asmlinkage void auto_inthandler(void);
asmlinkage void mach_inthandler(void);
asmlinkage void user_inthandler(void);
asmlinkage void bad_inthandler(void);
extern e_vector vectors[];