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-rw-r--r--arch/sparc/kernel/irq.c614
1 files changed, 614 insertions, 0 deletions
diff --git a/arch/sparc/kernel/irq.c b/arch/sparc/kernel/irq.c
new file mode 100644
index 000000000000..410b9a72aba9
--- /dev/null
+++ b/arch/sparc/kernel/irq.c
@@ -0,0 +1,614 @@
+/* $Id: irq.c,v 1.114 2001/12/11 04:55:51 davem Exp $
+ * arch/sparc/kernel/irq.c: Interrupt request handling routines. On the
+ * Sparc the IRQ's 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/config.h>
+#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/sched.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.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>
+
+#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 __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 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 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(__local_irq_save);
+EXPORT_SYMBOL(local_irq_enable);
+EXPORT_SYMBOL(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)(irqreturn_t (*)(int, void *,struct pt_regs *)) =
+ (void (*)(irqreturn_t (*)(int, void *,struct pt_regs *))) 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;
+
+struct irqaction *irq_action[NR_IRQS] = {
+ [0 ... (NR_IRQS-1)] = NULL
+};
+
+/* 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 = *(i + irq_action);
+ if (!action)
+ goto out_unlock;
+ 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(cpu_logical_map(j)).irqs[i]);
+ }
+#endif
+ seq_printf(p, " %c %s",
+ (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_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 * tmp = NULL;
+ 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);
+
+ action = *(cpu_irq + irq_action);
+
+ 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;
+ tmp = action;
+ }
+ if (!action) {
+ printk("Trying to free free shared IRQ%d\n",irq);
+ goto out_unlock;
+ }
+ } else if (action->flags & SA_SHIRQ) {
+ 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;
+ }
+
+ if (action && tmp)
+ tmp->next = action->next;
+ else
+ *(cpu_irq + irq_action) = action->next;
+
+ spin_unlock_irqrestore(&irq_action_lock, flags);
+
+ synchronize_irq(irq);
+
+ spin_lock_irqsave(&irq_action_lock, flags);
+
+ kfree(action);
+
+ if (!(*(cpu_irq + 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)
+{
+ printk("synchronize_irq says: implement me!\n");
+ BUG();
+}
+#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 = *(cpu_irq + 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 irqaction * action;
+ int cpu = smp_processor_id();
+#ifdef CONFIG_SMP
+ extern void smp4m_irq_rotate(int cpu);
+#endif
+
+ irq_enter();
+ disable_pil_irq(irq);
+#ifdef CONFIG_SMP
+ /* Only rotate on lower priority IRQ's (scsi, ethernet, etc.). */
+ if(irq < 10)
+ smp4m_irq_rotate(cpu);
+#endif
+ action = *(irq + irq_action);
+ kstat_cpu(cpu).irqs[irq]++;
+ do {
+ if (!action || !action->handler)
+ unexpected_irq(irq, NULL, regs);
+ action->handler(irq, action->dev_id, regs);
+ action = action->next;
+ } while (action);
+ enable_pil_irq(irq);
+ irq_exit();
+}
+
+#ifdef CONFIG_BLK_DEV_FD
+extern void floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+
+void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ int cpu = smp_processor_id();
+
+ disable_pil_irq(irq);
+ irq_enter();
+ kstat_cpu(cpu).irqs[irq]++;
+ floppy_interrupt(irq, dev_id, regs);
+ irq_exit();
+ enable_pil_irq(irq);
+ // XXX Eek, it's totally changed with preempt_count() and such
+ // if (softirq_pending(cpu))
+ // do_softirq();
+}
+#endif
+
+/* Fast IRQ's on the Sparc can only have one routine attached to them,
+ * thus no sharing possible.
+ */
+int request_fast_irq(unsigned int irq,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ 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 = *(cpu_irq + irq_action);
+ if(action) {
+ if(action->flags & SA_SHIRQ)
+ panic("Trying to register fast irq when already shared.\n");
+ if(irqflags & SA_SHIRQ)
+ 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 = (struct irqaction *)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->handler = handler;
+ action->flags = irqflags;
+ cpus_clear(action->mask);
+ action->name = devname;
+ action->dev_id = NULL;
+ action->next = NULL;
+
+ *(cpu_irq + irq_action) = action;
+
+ enable_irq(irq);
+
+ ret = 0;
+out_unlock:
+ spin_unlock_irqrestore(&irq_action_lock, flags);
+out:
+ return ret;
+}
+
+int request_irq(unsigned int irq,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long irqflags, const char * devname, void *dev_id)
+{
+ struct irqaction * action, *tmp = NULL;
+ unsigned long flags;
+ unsigned int cpu_irq;
+ int ret;
+
+ if (sparc_cpu_model == sun4d) {
+ extern int sun4d_request_irq(unsigned int,
+ irqreturn_t (*)(int, void *, struct pt_regs *),
+ 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);
+
+ action = *(cpu_irq + irq_action);
+ if (action) {
+ if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
+ for (tmp = action; tmp->next; tmp = tmp->next);
+ } else {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {
+ printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+ action = NULL; /* Or else! */
+ }
+
+ /* 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 = (struct irqaction *)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;
+
+ if (tmp)
+ tmp->next = action;
+ else
+ *(cpu_irq + irq_action) = action;
+
+ enable_irq(irq);
+
+ ret = 0;
+out_unlock:
+ spin_unlock_irqrestore(&irq_action_lock, flags);
+out:
+ return ret;
+}
+
+EXPORT_SYMBOL(request_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 IRQ's on this Sun machine...");
+ break;
+ }
+ btfixup();
+}
+
+void init_irq_proc(void)
+{
+ /* For now, nothing... */
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.