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linux-sg2042/arch/sparc/kernel/irq.c

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/*
* arch/sparc/kernel/irq.c: Interrupt request handling routines. On the
* Sparc the IRQs are basically 'cast in stone'
* and you are supposed to probe the prom's device
* node trees to find out who's got which IRQ.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
* Copyright (C) 1995,2002 Pete A. Zaitcev (zaitcev@yahoo.com)
* Copyright (C) 1996 Dave Redman (djhr@tadpole.co.uk)
* Copyright (C) 1998-2000 Anton Blanchard (anton@samba.org)
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/delay.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/seq_file.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/psr.h>
#include <asm/smp.h>
#include <asm/vaddrs.h>
#include <asm/timer.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/traps.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/pcic.h>
#include <asm/cacheflush.h>
#include <asm/irq_regs.h>
#include "irq.h"
#ifdef CONFIG_SMP
#define SMP_NOP2 "nop; nop;\n\t"
#define SMP_NOP3 "nop; nop; nop;\n\t"
#else
#define SMP_NOP2
#define SMP_NOP3
#endif /* SMP */
unsigned long __raw_local_irq_save(void)
{
unsigned long retval;
unsigned long tmp;
__asm__ __volatile__(
"rd %%psr, %0\n\t"
SMP_NOP3 /* Sun4m + Cypress + SMP bug */
"or %0, %2, %1\n\t"
"wr %1, 0, %%psr\n\t"
"nop; nop; nop\n"
: "=&r" (retval), "=r" (tmp)
: "i" (PSR_PIL)
: "memory");
return retval;
}
void raw_local_irq_enable(void)
{
unsigned long tmp;
__asm__ __volatile__(
"rd %%psr, %0\n\t"
SMP_NOP3 /* Sun4m + Cypress + SMP bug */
"andn %0, %1, %0\n\t"
"wr %0, 0, %%psr\n\t"
"nop; nop; nop\n"
: "=&r" (tmp)
: "i" (PSR_PIL)
: "memory");
}
void raw_local_irq_restore(unsigned long old_psr)
{
unsigned long tmp;
__asm__ __volatile__(
"rd %%psr, %0\n\t"
"and %2, %1, %2\n\t"
SMP_NOP2 /* Sun4m + Cypress + SMP bug */
"andn %0, %1, %0\n\t"
"wr %0, %2, %%psr\n\t"
"nop; nop; nop\n"
: "=&r" (tmp)
: "i" (PSR_PIL), "r" (old_psr)
: "memory");
}
EXPORT_SYMBOL(__raw_local_irq_save);
EXPORT_SYMBOL(raw_local_irq_enable);
EXPORT_SYMBOL(raw_local_irq_restore);
/*
* Dave Redman (djhr@tadpole.co.uk)
*
* IRQ numbers.. These are no longer restricted to 15..
*
* this is done to enable SBUS cards and onboard IO to be masked
* correctly. using the interrupt level isn't good enough.
*
* For example:
* A device interrupting at sbus level6 and the Floppy both come in
* at IRQ11, but enabling and disabling them requires writing to
* different bits in the SLAVIO/SEC.
*
* As a result of these changes sun4m machines could now support
* directed CPU interrupts using the existing enable/disable irq code
* with tweaks.
*
*/
static void irq_panic(void)
{
extern char *cputypval;
prom_printf("machine: %s doesn't have irq handlers defined!\n",cputypval);
prom_halt();
}
void (*sparc_init_timers)(irq_handler_t ) =
(void (*)(irq_handler_t )) irq_panic;
/*
* Dave Redman (djhr@tadpole.co.uk)
*
* There used to be extern calls and hard coded values here.. very sucky!
* instead, because some of the devices attach very early, I do something
* equally sucky but at least we'll never try to free statically allocated
* space or call kmalloc before kmalloc_init :(.
*
* In fact it's the timer10 that attaches first.. then timer14
* then kmalloc_init is called.. then the tty interrupts attach.
* hmmm....
*
*/
#define MAX_STATIC_ALLOC 4
struct irqaction static_irqaction[MAX_STATIC_ALLOC];
int static_irq_count;
static struct {
struct irqaction *action;
int flags;
} sparc_irq[NR_IRQS];
#define SPARC_IRQ_INPROGRESS 1
/* Used to protect the IRQ action lists */
DEFINE_SPINLOCK(irq_action_lock);
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v;
struct irqaction * action;
unsigned long flags;
#ifdef CONFIG_SMP
int j;
#endif
if (sparc_cpu_model == sun4d) {
extern int show_sun4d_interrupts(struct seq_file *, void *);
return show_sun4d_interrupts(p, v);
}
spin_lock_irqsave(&irq_action_lock, flags);
if (i < NR_IRQS) {
action = sparc_irq[i].action;
if (!action)
goto out_unlock;
seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i));
#else
for_each_online_cpu(j) {
seq_printf(p, "%10u ",
kstat_cpu(j).irqs[i]);
}
#endif
seq_printf(p, " %c %s",
(action->flags & IRQF_DISABLED) ? '+' : ' ',
action->name);
for (action=action->next; action; action = action->next) {
seq_printf(p, ",%s %s",
(action->flags & IRQF_DISABLED) ? " +" : "",
action->name);
}
seq_putc(p, '\n');
}
out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
return 0;
}
void free_irq(unsigned int irq, void *dev_id)
{
struct irqaction * action;
struct irqaction **actionp;
unsigned long flags;
unsigned int cpu_irq;
if (sparc_cpu_model == sun4d) {
extern void sun4d_free_irq(unsigned int, void *);
sun4d_free_irq(irq, dev_id);
return;
}
cpu_irq = irq & (NR_IRQS - 1);
if (cpu_irq > 14) { /* 14 irq levels on the sparc */
printk("Trying to free bogus IRQ %d\n", irq);
return;
}
spin_lock_irqsave(&irq_action_lock, flags);
actionp = &sparc_irq[cpu_irq].action;
action = *actionp;
if (!action->handler) {
printk("Trying to free free IRQ%d\n",irq);
goto out_unlock;
}
if (dev_id) {
for (; action; action = action->next) {
if (action->dev_id == dev_id)
break;
actionp = &action->next;
}
if (!action) {
printk("Trying to free free shared IRQ%d\n",irq);
goto out_unlock;
}
} else if (action->flags & IRQF_SHARED) {
printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
goto out_unlock;
}
if (action->flags & SA_STATIC_ALLOC)
{
/* This interrupt is marked as specially allocated
* so it is a bad idea to free it.
*/
printk("Attempt to free statically allocated IRQ%d (%s)\n",
irq, action->name);
goto out_unlock;
}
*actionp = action->next;
spin_unlock_irqrestore(&irq_action_lock, flags);
synchronize_irq(irq);
spin_lock_irqsave(&irq_action_lock, flags);
kfree(action);
if (!sparc_irq[cpu_irq].action)
__disable_irq(irq);
out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
}
EXPORT_SYMBOL(free_irq);
/*
* This is called when we want to synchronize with
* interrupts. We may for example tell a device to
* stop sending interrupts: but to make sure there
* are no interrupts that are executing on another
* CPU we need to call this function.
*/
#ifdef CONFIG_SMP
void synchronize_irq(unsigned int irq)
{
unsigned int cpu_irq;
cpu_irq = irq & (NR_IRQS - 1);
while (sparc_irq[cpu_irq].flags & SPARC_IRQ_INPROGRESS)
cpu_relax();
}
#endif /* SMP */
void unexpected_irq(int irq, void *dev_id, struct pt_regs * regs)
{
int i;
struct irqaction * action;
unsigned int cpu_irq;
cpu_irq = irq & (NR_IRQS - 1);
action = sparc_irq[cpu_irq].action;
printk("IO device interrupt, irq = %d\n", irq);
printk("PC = %08lx NPC = %08lx FP=%08lx\n", regs->pc,
regs->npc, regs->u_regs[14]);
if (action) {
printk("Expecting: ");
for (i = 0; i < 16; i++)
if (action->handler)
printk("[%s:%d:0x%x] ", action->name,
(int) i, (unsigned int) action->handler);
}
printk("AIEEE\n");
panic("bogus interrupt received");
}
void handler_irq(int irq, struct pt_regs * regs)
{
struct pt_regs *old_regs;
struct irqaction * action;
int cpu = smp_processor_id();
#ifdef CONFIG_SMP
extern void smp4m_irq_rotate(int cpu);
#endif
old_regs = set_irq_regs(regs);
irq_enter();
disable_pil_irq(irq);
#ifdef CONFIG_SMP
/* Only rotate on lower priority IRQs (scsi, ethernet, etc.). */
if((sparc_cpu_model==sun4m) && (irq < 10))
smp4m_irq_rotate(cpu);
#endif
action = sparc_irq[irq].action;
sparc_irq[irq].flags |= SPARC_IRQ_INPROGRESS;
kstat_cpu(cpu).irqs[irq]++;
do {
if (!action || !action->handler)
unexpected_irq(irq, NULL, regs);
action->handler(irq, action->dev_id);
action = action->next;
} while (action);
sparc_irq[irq].flags &= ~SPARC_IRQ_INPROGRESS;
enable_pil_irq(irq);
irq_exit();
set_irq_regs(old_regs);
}
#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
/* Fast IRQs on the Sparc can only have one routine attached to them,
* thus no sharing possible.
*/
static int request_fast_irq(unsigned int irq,
void (*handler)(void),
unsigned long irqflags, const char *devname)
{
struct irqaction *action;
unsigned long flags;
unsigned int cpu_irq;
int ret;
#ifdef CONFIG_SMP
struct tt_entry *trap_table;
extern struct tt_entry trapbase_cpu1, trapbase_cpu2, trapbase_cpu3;
#endif
cpu_irq = irq & (NR_IRQS - 1);
if(cpu_irq > 14) {
ret = -EINVAL;
goto out;
}
if(!handler) {
ret = -EINVAL;
goto out;
}
spin_lock_irqsave(&irq_action_lock, flags);
action = sparc_irq[cpu_irq].action;
if(action) {
if(action->flags & IRQF_SHARED)
panic("Trying to register fast irq when already shared.\n");
if(irqflags & IRQF_SHARED)
panic("Trying to register fast irq as shared.\n");
/* Anyway, someone already owns it so cannot be made fast. */
printk("request_fast_irq: Trying to register yet already owned.\n");
ret = -EBUSY;
goto out_unlock;
}
/* If this is flagged as statically allocated then we use our
* private struct which is never freed.
*/
if (irqflags & SA_STATIC_ALLOC) {
if (static_irq_count < MAX_STATIC_ALLOC)
action = &static_irqaction[static_irq_count++];
else
printk("Fast IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n",
irq, devname);
}
if (action == NULL)
action = kmalloc(sizeof(struct irqaction),
GFP_ATOMIC);
if (!action) {
ret = -ENOMEM;
goto out_unlock;
}
/* Dork with trap table if we get this far. */
#define INSTANTIATE(table) \
table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_one = SPARC_RD_PSR_L0; \
table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two = \
SPARC_BRANCH((unsigned long) handler, \
(unsigned long) &table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_two);\
table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_three = SPARC_RD_WIM_L3; \
table[SP_TRAP_IRQ1+(cpu_irq-1)].inst_four = SPARC_NOP;
INSTANTIATE(sparc_ttable)
#ifdef CONFIG_SMP
trap_table = &trapbase_cpu1; INSTANTIATE(trap_table)
trap_table = &trapbase_cpu2; INSTANTIATE(trap_table)
trap_table = &trapbase_cpu3; INSTANTIATE(trap_table)
#endif
#undef INSTANTIATE
/*
* XXX Correct thing whould be to flush only I- and D-cache lines
* which contain the handler in question. But as of time of the
* writing we have no CPU-neutral interface to fine-grained flushes.
*/
flush_cache_all();
action->flags = irqflags;
cpus_clear(action->mask);
action->name = devname;
action->dev_id = NULL;
action->next = NULL;
sparc_irq[cpu_irq].action = action;
__enable_irq(irq);
ret = 0;
out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
out:
return ret;
}
/* These variables are used to access state from the assembler
* interrupt handler, floppy_hardint, so we cannot put these in
* the floppy driver image because that would not work in the
* modular case.
*/
volatile unsigned char *fdc_status;
EXPORT_SYMBOL(fdc_status);
char *pdma_vaddr;
EXPORT_SYMBOL(pdma_vaddr);
unsigned long pdma_size;
EXPORT_SYMBOL(pdma_size);
volatile int doing_pdma;
EXPORT_SYMBOL(doing_pdma);
char *pdma_base;
EXPORT_SYMBOL(pdma_base);
unsigned long pdma_areasize;
EXPORT_SYMBOL(pdma_areasize);
extern void floppy_hardint(void);
static irq_handler_t floppy_irq_handler;
void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
{
struct pt_regs *old_regs;
int cpu = smp_processor_id();
old_regs = set_irq_regs(regs);
disable_pil_irq(irq);
irq_enter();
kstat_cpu(cpu).irqs[irq]++;
floppy_irq_handler(irq, dev_id);
irq_exit();
enable_pil_irq(irq);
set_irq_regs(old_regs);
// XXX Eek, it's totally changed with preempt_count() and such
// if (softirq_pending(cpu))
// do_softirq();
}
int sparc_floppy_request_irq(int irq, unsigned long flags,
irq_handler_t irq_handler)
{
floppy_irq_handler = irq_handler;
return request_fast_irq(irq, floppy_hardint, flags, "floppy");
}
EXPORT_SYMBOL(sparc_floppy_request_irq);
#endif
int request_irq(unsigned int irq,
irq_handler_t handler,
unsigned long irqflags, const char * devname, void *dev_id)
{
struct irqaction * action, **actionp;
unsigned long flags;
unsigned int cpu_irq;
int ret;
if (sparc_cpu_model == sun4d) {
extern int sun4d_request_irq(unsigned int,
irq_handler_t ,
unsigned long, const char *, void *);
return sun4d_request_irq(irq, handler, irqflags, devname, dev_id);
}
cpu_irq = irq & (NR_IRQS - 1);
if(cpu_irq > 14) {
ret = -EINVAL;
goto out;
}
if (!handler) {
ret = -EINVAL;
goto out;
}
spin_lock_irqsave(&irq_action_lock, flags);
actionp = &sparc_irq[cpu_irq].action;
action = *actionp;
if (action) {
if (!(action->flags & IRQF_SHARED) || !(irqflags & IRQF_SHARED)) {
ret = -EBUSY;
goto out_unlock;
}
if ((action->flags & IRQF_DISABLED) != (irqflags & IRQF_DISABLED)) {
printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
ret = -EBUSY;
goto out_unlock;
}
for ( ; action; action = *actionp)
actionp = &action->next;
}
/* If this is flagged as statically allocated then we use our
* private struct which is never freed.
*/
if (irqflags & SA_STATIC_ALLOC) {
if (static_irq_count < MAX_STATIC_ALLOC)
action = &static_irqaction[static_irq_count++];
else
printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
}
if (action == NULL)
action = kmalloc(sizeof(struct irqaction),
GFP_ATOMIC);
if (!action) {
ret = -ENOMEM;
goto out_unlock;
}
action->handler = handler;
action->flags = irqflags;
cpus_clear(action->mask);
action->name = devname;
action->next = NULL;
action->dev_id = dev_id;
*actionp = action;
__enable_irq(irq);
ret = 0;
out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
out:
return ret;
}
EXPORT_SYMBOL(request_irq);
void disable_irq_nosync(unsigned int irq)
{
return __disable_irq(irq);
}
EXPORT_SYMBOL(disable_irq_nosync);
void disable_irq(unsigned int irq)
{
return __disable_irq(irq);
}
EXPORT_SYMBOL(disable_irq);
void enable_irq(unsigned int irq)
{
return __enable_irq(irq);
}
EXPORT_SYMBOL(enable_irq);
/* We really don't need these at all on the Sparc. We only have
* stubs here because they are exported to modules.
*/
unsigned long probe_irq_on(void)
{
return 0;
}
EXPORT_SYMBOL(probe_irq_on);
int probe_irq_off(unsigned long mask)
{
return 0;
}
EXPORT_SYMBOL(probe_irq_off);
/* djhr
* This could probably be made indirect too and assigned in the CPU
* bits of the code. That would be much nicer I think and would also
* fit in with the idea of being able to tune your kernel for your machine
* by removing unrequired machine and device support.
*
*/
void __init init_IRQ(void)
{
extern void sun4c_init_IRQ( void );
extern void sun4m_init_IRQ( void );
extern void sun4d_init_IRQ( void );
switch(sparc_cpu_model) {
case sun4c:
case sun4:
sun4c_init_IRQ();
break;
case sun4m:
#ifdef CONFIG_PCI
pcic_probe();
if (pcic_present()) {
sun4m_pci_init_IRQ();
break;
}
#endif
sun4m_init_IRQ();
break;
case sun4d:
sun4d_init_IRQ();
break;
default:
prom_printf("Cannot initialize IRQs on this Sun machine...");
break;
}
btfixup();
}
void init_irq_proc(void)
{
/* For now, nothing... */
}
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