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... */
+}