-/* $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
*
*/
#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.
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
-void arch_setup_irq(int irq)
+static void enable_crisv10_irq(unsigned int irq)
{
- set_int_vector(irq, interrupt[irq]);
+ unmask_irq(irq);
}
-void arch_free_irq(int irq)
+static void disable_crisv10_irq(unsigned int irq)
{
- set_int_vector(irq, bad_interrupt[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 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
*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
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);
* shouldn't result in any weird surprises, and installing new handlers
* should be easier.
*
- * Notice Linux/CRIS: these routines do not care about SMP
- *
*/
/*
#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>
#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)
-{
- unsigned long flags;
-
- local_save_flags(flags);
- local_irq_disable();
- mask_irq(irq_nr);
- local_irq_restore(flags);
-}
-
-void
-enable_irq(unsigned int irq_nr)
+void ack_bad_irq(unsigned int irq)
{
- unsigned long flags;
- local_save_flags(flags);
- local_irq_disable();
- unmask_irq(irq_nr);
- local_irq_restore(flags);
+ printk("unexpected IRQ trap at vector %02x\n", irq);
}
-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
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();
- }
- 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;
+ 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);
}
- 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);
+ __do_IRQ(irq, regs);
+ irq_exit();
}
-EXPORT_SYMBOL(free_irq);
-
void weird_irq(void)
{
local_irq_disable();
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
};
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)
#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 $r0\n\t" \
- "reti\n\t" \
- "nop\n");
+ "jump ret_from_intr\n\t");
/* This is subtle. The timer interrupt is crucial and it should not be disabled for
* too long. However, if it had been a normal interrupt as per BUILD_IRQ, it would
#define BUILD_TIMER_IRQ(nr,mask) \
void IRQ_NAME(nr); \
-void sIRQ_NAME(nr); \
-void BAD_IRQ_NAME(nr); \
__asm__ ( \
".text\n\t" \
"IRQ" #nr "_interrupt:\n\t" \
SAVE_ALL \
- "sIRQ" #nr "_interrupt:\n\t" /* shortcut for the multiple irq handler */ \
"moveq "#nr",$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
projects / linux-flexiantxendom0-natty.git / commitdiff