summaryrefslogtreecommitdiffstats
path: root/arch/mips/orion/irq.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/orion/irq.c')
-rw-r--r--arch/mips/orion/irq.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/arch/mips/orion/irq.c b/arch/mips/orion/irq.c
new file mode 100644
index 000000000..f61690b85
--- /dev/null
+++ b/arch/mips/orion/irq.c
@@ -0,0 +1,284 @@
+/*
+ * Code to handle irqs on Orion boards
+ * -- Cort <cort@fsmlabs.com>
+ */
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/malloc.h>
+#include <linux/random.h>
+
+#include <asm/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/orion.h>
+
+void (*board_time_init)(struct irqaction *irq);
+extern asmlinkage void orionIRQ(void);
+irq_cpustat_t irq_stat [NR_CPUS];
+unsigned int local_bh_count[NR_CPUS];
+unsigned int local_irq_count[NR_CPUS];
+unsigned long spurious_count = 0;
+irq_desc_t irq_desc[NR_IRQS];
+
+static void galileo_ack(unsigned int irq_nr)
+{
+ *((unsigned long *) (((unsigned)( 0x14000000 )|0xA0000000) + 0xC18) ) = (((( 0 )&0xff)<<24)+ ((( 0 )&0xff00)<<8)+ ((( 0 )&0xff0000)>>8)+ ((( 0 )&0xff000000)>>24)) ;
+}
+
+struct hw_interrupt_type galileo_pic = {
+ " Galileo ",
+ NULL,
+ NULL,
+ NULL, /* unmask_irq */
+ NULL, /* mask_irq */
+ galileo_ack, /* mask_and_ack */
+ 0
+};
+
+/* Function for careful CP0 interrupt mask access */
+static inline void modify_cp0_intmask(unsigned clr_mask, unsigned set_mask)
+{
+ unsigned long status = read_32bit_cp0_register(CP0_STATUS);
+ status &= ~((clr_mask & 0xFF) << 8);
+ status |= (set_mask & 0xFF) << 8;
+ write_32bit_cp0_register(CP0_STATUS, status);
+}
+
+static inline void mask_irq(unsigned int irq_nr)
+{
+ modify_cp0_intmask(irq_nr, 0);
+}
+
+static inline void unmask_irq(unsigned int irq_nr)
+{
+ modify_cp0_intmask(0, irq_nr);
+}
+
+void disable_irq(unsigned int irq_nr)
+{
+ unsigned long flags;
+
+ save_and_cli(flags);
+ mask_irq(irq_nr);
+ restore_flags(flags);
+}
+
+void enable_irq(unsigned int irq_nr)
+{
+ unsigned long flags;
+
+ save_and_cli(flags);
+ unmask_irq(irq_nr);
+ restore_flags(flags);
+}
+
+/*static struct irqaction *irq_action[NR_IRQS] = {
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+};
+*/
+void __init orion_time_init(struct irqaction *irq)
+{
+ __u32 timer_count;
+
+ irq_desc[2].handler = &galileo_pic;
+ irq_desc[2].action = irq;
+
+ /* This code was provided by the CoSine guys and despite its
+ * appearance init's the timer.
+ * -- Cort
+ */
+ *((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0x864) ) = (((( 0 )&0xff)<<24)+ ((( 0 )&0xff00)<<8)+ ((( 0 )&0xff0000)>>8)+ ((( 0 )&0xff000000)>>24)) ;
+
+ *((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0x850) ) = (((( 0 )&0xff)<<24)+ ((( 0 )&0xff00)<<8)+ ((( 0 )&0xff0000)>>8)+ ((( 0 )&0xff000000)>>24)) ;
+
+ timer_count = 300000000/100;
+
+ *((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0x850) ) = (((( timer_count )&0xff)<<24)+ ((( timer_count )&0xff00)<<8)+ ((( timer_count )&0xff0000)>>8)+ ((( timer_count )&0xff000000)>>24)) ;
+
+ *((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0xC1C) ) = (((( 0x100 )&0xff)<<24)+ ((( 0x100 )&0xff00)<<8)+ ((( 0x100 )&0xff0000)>>8)+ ((( 0x100 )&0xff000000)>>24)) ;
+
+ *((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0x864) ) = (((( 0x03 )&0xff)<<24)+ ((( 0x03 )&0xff00)<<8)+ ((( 0x03 )&0xff0000)>>8)+ ((( 0x03 )&0xff000000)>>24)) ;
+
+ *((__u32 *) (((unsigned)( 0x14000000 )|0xA0000000) + 0xC18) ) = (((( 0 )&0xff)<<24)+ ((( 0 )&0xff00)<<8)+ ((( 0 )&0xff0000)>>8)+ ((( 0 )&0xff000000)>>24)) ;
+}
+
+int get_irq_list(char *buf)
+{
+ int i, len = 0, j;
+ struct irqaction * action;
+
+ len += sprintf(buf+len, " ");
+ for (j=0; j<smp_num_cpus; j++)
+ len += sprintf(buf+len, "CPU%d ",j);
+ *(char *)(buf+len++) = '\n';
+
+ for (i = 0 ; i < NR_IRQS ; i++) {
+ action = irq_desc[i].action;
+ if ( !action || !action->handler )
+ continue;
+ len += sprintf(buf+len, "%3d: ", i);
+ len += sprintf(buf+len, "%10u ", kstat_irqs(i));
+ if ( irq_desc[i].handler )
+ len += sprintf(buf+len, " %s ", irq_desc[i].handler->typename );
+ else
+ len += sprintf(buf+len, " None ");
+ len += sprintf(buf+len, " %s",action->name);
+ for (action=action->next; action; action = action->next) {
+ len += sprintf(buf+len, ", %s", action->name);
+ }
+ len += sprintf(buf+len, "\n");
+ }
+ len += sprintf(buf+len, "BAD: %10lu\n", spurious_count);
+ return len;
+}
+
+asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
+{
+ struct irqaction *action;
+ int do_random, cpu;
+ int status;
+
+ cpu = smp_processor_id();
+ irq_enter(cpu);
+ kstat.irqs[cpu][irq]++;
+ status = 0;
+
+ if (irq_desc[irq].handler->ack)
+ irq_desc[irq].handler->ack(irq);
+
+ action = irq_desc[irq].action;
+ if (action && action->handler)
+ {
+ if (!(action->flags & SA_INTERRUPT))
+ __sti();
+ do {
+ status |= action->flags;
+ action->handler(irq, action->dev_id, regs);
+ action = action->next;
+ } while ( action );
+ __cli();
+ if (irq_desc[irq].handler)
+ {
+ if (irq_desc[irq].handler->end)
+ irq_desc[irq].handler->end(irq);
+ else if (irq_desc[irq].handler->enable)
+ irq_desc[irq].handler->enable(irq);
+ }
+ }
+
+ irq_exit(cpu);
+
+ if (softirq_state[cpu].active&softirq_state[cpu].mask)
+ do_softirq();
+
+ /* unmasking and bottom half handling is done magically for us. */
+}
+
+int request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
+ unsigned long irqflags, const char * devname, void *dev_id)
+{
+ struct irqaction *old, **p, *action;
+ unsigned long flags;
+
+ if (irq >= NR_IRQS)
+ return -EINVAL;
+ if (!handler)
+ {
+ /* Free */
+ for (p = &irq_desc[irq].action; (action = *p) != NULL; p = &action->next)
+ {
+ /* Found it - now free it */
+ save_flags(flags);
+ cli();
+ *p = action->next;
+ restore_flags(flags);
+ kfree(action);
+ return 0;
+ }
+ return -ENOENT;
+ }
+
+ action = (struct irqaction *)
+ kmalloc(sizeof(struct irqaction), GFP_KERNEL);
+ if (!action)
+ return -ENOMEM;
+
+ save_flags(flags);
+ cli();
+
+ action->handler = handler;
+ action->flags = irqflags;
+ action->mask = 0;
+ action->name = devname;
+ action->dev_id = dev_id;
+ action->next = NULL;
+ enable_irq(irq);
+
+ p = &irq_desc[irq].action;
+
+ if ((old = *p) != NULL) {
+ /* Can't share interrupts unless both agree to */
+ if (!(old->flags & action->flags & SA_SHIRQ))
+ return -EBUSY;
+ /* add new interrupt at end of irq queue */
+ do {
+ p = &old->next;
+ old = *p;
+ } while (old);
+ }
+ *p = action;
+
+ restore_flags(flags);
+ return 0;
+}
+
+void free_irq(unsigned int irq, void *dev_id)
+{
+ request_irq(irq, NULL, 0, NULL, dev_id);
+}
+
+
+unsigned long probe_irq_on (void)
+{
+ return 0;
+}
+
+int probe_irq_off (unsigned long irqs)
+{
+ return 0;
+}
+
+int (*irq_cannonicalize)(int irq);
+
+int orion_irq_cannonicalize(int i)
+{
+ return i;
+}
+
+void __init init_IRQ(void)
+{
+
+ irq_cannonicalize = orion_irq_cannonicalize;
+ set_except_vector(0, orionIRQ);
+}
+
+EXPORT_SYMBOL(irq_cannonicalize);
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-20 02:36:54 +0000