[PATCH] v850: use generic hardirq code

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Miles Bader <miles@gnu.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 13 insertions, 631 deletions

diff --git a/arch/v850/Kconfig b/arch/v850/Kconfig
index 89c053b6c2c4..310865903234 100644
--- a/arch/v850/Kconfig
+++ b/arch/v850/Kconfig
@@ -23,6 +23,14 @@ config GENERIC_CALIBRATE_DELAY
         bool
         default y
 
+config GENERIC_HARDIRQS
+        bool
+        default y
+
+config GENERIC_IRQ_PROBE
+        bool
+        default y
+
 # Turn off some random 386 crap that can affect device config
 config ISA
         bool
diff --git a/arch/v850/kernel/irq.c b/arch/v850/kernel/irq.c
index 534eb8ab97a7..7a151c26f82e 100644
--- a/arch/v850/kernel/irq.c
+++ b/arch/v850/kernel/irq.c
@@ -27,55 +27,15 @@
 #include <asm/system.h>
 
 /*
- * Controller mappings for all interrupt sources:
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves, it doesn't deserve
+ * a generic callback i think.
  */
-irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
-        [0 ... NR_IRQS-1] = {
-                .handler = &no_irq_type,
-                .lock = SPIN_LOCK_UNLOCKED
-        }
-};
-
-/*
- * Special irq handlers.
- */
-
-irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
-{
-        return IRQ_NONE;
-}
-
-/*
- * Generic no controller code
- */
-
-static void enable_none(unsigned int irq) { }
-static unsigned int startup_none(unsigned int irq) { return 0; }
-static void disable_none(unsigned int irq) { }
-static void ack_none(unsigned int irq)
+void ack_bad_irq(unsigned int irq)
 {
-        /*
-         * 'what should we do if we get a hw irq event on an illegal vector'.
-         * each architecture has to answer this themselves, it doesn't deserve
-         * a generic callback i think.
-         */
         printk("received IRQ %d with unknown interrupt type\n", irq);
 }
 
-/* startup is the same as "enable", shutdown is same as "disable" */
-#define shutdown_none   disable_none
-#define end_none        enable_none
-
-struct hw_interrupt_type no_irq_type = {
-        .typename = "none",
-        .startup = startup_none,
-        .shutdown = shutdown_none,
-        .enable = enable_none,
-        .disable = disable_none,
-        .ack = ack_none,
-        .end = end_none
-};
-
 volatile unsigned long irq_err_count, spurious_count;
 
 /*
@@ -136,596 +96,16 @@ int show_interrupts(struct seq_file *p, void *v)
         return 0;
 }
 
-/*
- * This should really return information about whether
- * we should do bottom half handling etc. Right now we
- * end up _always_ checking the bottom half, which is a
- * waste of time and is not what some drivers would
- * prefer.
- */
-int handle_IRQ_event(unsigned int irq, struct pt_regs * regs, struct irqaction * action)
-{
-        int status = 1; /* Force the "do bottom halves" bit */
-        int ret;
-
-        if (!(action->flags & SA_INTERRUPT))
-                local_irq_enable();
-
-        do {
-                ret = action->handler(irq, action->dev_id, regs);
-                if (ret == IRQ_HANDLED)
-                        status |= action->flags;
-                action = action->next;
-        } while (action);
-        if (status & SA_SAMPLE_RANDOM)
-                add_interrupt_randomness(irq);
-        local_irq_disable();
-
-        return status;
-}
-
-/*
- * Generic enable/disable code: this just calls
- * down into the PIC-specific version for the actual
- * hardware disable after having gotten the irq
- * controller lock. 
- */
- 
-/**
- *      disable_irq_nosync - disable an irq without waiting
- *      @irq: Interrupt to disable
- *
- *      Disable the selected interrupt line. Disables of an interrupt
- *      stack. Unlike disable_irq(), this function does not ensure existing
- *      instances of the IRQ handler have completed before returning.
- *
- *      This function may be called from IRQ context.
- */
- 
-void inline disable_irq_nosync(unsigned int irq)
-{
-        irq_desc_t *desc = irq_desc + irq;
-        unsigned long flags;
-
-        spin_lock_irqsave(&desc->lock, flags);
-        if (!desc->depth++) {
-                desc->status |= IRQ_DISABLED;
-                desc->handler->disable(irq);
-        }
-        spin_unlock_irqrestore(&desc->lock, flags);
-}
-
-/**
- *      disable_irq - disable an irq and wait for completion
- *      @irq: Interrupt to disable
- *
- *      Disable the selected interrupt line. Disables of an interrupt
- *      stack. That is for two disables you need two enables. This
- *      function waits for any pending IRQ handlers for this interrupt
- *      to complete before returning. If you use this function while
- *      holding a resource the IRQ handler may need you will deadlock.
- *
- *      This function may be called - with care - from IRQ context.
- */
- 
-void disable_irq(unsigned int irq)
-{
-        disable_irq_nosync(irq);
-        synchronize_irq(irq);
-}
-
-/**
- *      enable_irq - enable interrupt handling on an irq
- *      @irq: Interrupt to enable
- *
- *      Re-enables the processing of interrupts on this IRQ line
- *      providing no disable_irq calls are now in effect.
- *
- *      This function may be called from IRQ context.
- */
- 
-void enable_irq(unsigned int irq)
-{
-        irq_desc_t *desc = irq_desc + irq;
-        unsigned long flags;
-
-        spin_lock_irqsave(&desc->lock, flags);
-        switch (desc->depth) {
-        case 1: {
-                unsigned int status = desc->status & ~IRQ_DISABLED;
-                desc->status = status;
-                if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
-                        desc->status = status | IRQ_REPLAY;
-                        hw_resend_irq(desc->handler,irq);
-                }
-                desc->handler->enable(irq);
-                /* fall-through */
-        }
-        default:
-                desc->depth--;
-                break;
-        case 0:
-                printk("enable_irq(%u) unbalanced from %p\n", irq,
-                       __builtin_return_address(0));
-        }
-        spin_unlock_irqrestore(&desc->lock, flags);
-}
-
 /* Handle interrupt IRQ.  REGS are the registers at the time of ther
    interrupt.  */
 unsigned int handle_irq (int irq, struct pt_regs *regs)
 {
-        /* 
-         * We ack quickly, we don't want the irq controller
-         * thinking we're snobs just because some other CPU has
-         * disabled global interrupts (we have already done the
-         * INT_ACK cycles, it's too late to try to pretend to the
-         * controller that we aren't taking the interrupt).
-         *
-         * 0 return value means that this irq is already being
-         * handled by some other CPU. (or is disabled)
-         */
-        int cpu = smp_processor_id();
-        irq_desc_t *desc = irq_desc + irq;
-        struct irqaction * action;
-        unsigned int status;
-
         irq_enter();
-        kstat_cpu(cpu).irqs[irq]++;
-        spin_lock(&desc->lock);
-        desc->handler->ack(irq);
-        /*
-           REPLAY is when Linux resends an IRQ that was dropped earlier
-           WAITING is used by probe to mark irqs that are being tested
-           */
-        status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING);
-        status |= IRQ_PENDING; /* we _want_ to handle it */
-
-        /*
-         * If the IRQ is disabled for whatever reason, we cannot
-         * use the action we have.
-         */
-        action = NULL;
-        if (likely(!(status & (IRQ_DISABLED | IRQ_INPROGRESS)))) {
-                action = desc->action;
-                status &= ~IRQ_PENDING; /* we commit to handling */
-                status |= IRQ_INPROGRESS; /* we are handling it */
-        }
-        desc->status = status;
-
-        /*
-         * If there is no IRQ handler or it was disabled, exit early.
-           Since we set PENDING, if another processor is handling
-           a different instance of this same irq, the other processor
-           will take care of it.
-         */
-        if (unlikely(!action))
-                goto out;
-
-        /*
-         * Edge triggered interrupts need to remember
-         * pending events.
-         * This applies to any hw interrupts that allow a second
-         * instance of the same irq to arrive while we are in handle_irq
-         * or in the handler. But the code here only handles the _second_
-         * instance of the irq, not the third or fourth. So it is mostly
-         * useful for irq hardware that does not mask cleanly in an
-         * SMP environment.
-         */
-        for (;;) {
-                spin_unlock(&desc->lock);
-                handle_IRQ_event(irq, regs, action);
-                spin_lock(&desc->lock);
-                
-                if (likely(!(desc->status & IRQ_PENDING)))
-                        break;
-                desc->status &= ~IRQ_PENDING;
-        }
-        desc->status &= ~IRQ_INPROGRESS;
-
-out:
-        /*
-         * The ->end() handler has to deal with interrupts which got
-         * disabled while the handler was running.
-         */
-        desc->handler->end(irq);
-        spin_unlock(&desc->lock);
-
+        __do_IRQ(irq, regs);
         irq_exit();
-
         return 1;
 }
 
-/**
- *      request_irq - allocate an interrupt line
- *      @irq: Interrupt line to allocate
- *      @handler: Function to be called when the IRQ occurs
- *      @irqflags: Interrupt type flags
- *      @devname: An ascii name for the claiming device
- *      @dev_id: A cookie passed back to the handler function
- *
- *      This call allocates interrupt resources and enables the
- *      interrupt line and IRQ handling. From the point this
- *      call is made your handler function may be invoked. Since
- *      your handler function must clear any interrupt the board 
- *      raises, you must take care both to initialise your hardware
- *      and to set up the interrupt handler in the right order.
- *
- *      Dev_id must be globally unique. Normally the address of the
- *      device data structure is used as the cookie. Since the handler
- *      receives this value it makes sense to use it.
- *
- *      If your interrupt is shared you must pass a non NULL dev_id
- *      as this is required when freeing the interrupt.
- *
- *      Flags:
- *
- *      SA_SHIRQ                Interrupt is shared
- *
- *      SA_INTERRUPT            Disable local interrupts while processing
- *
- *      SA_SAMPLE_RANDOM        The interrupt can be used for 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 1
-        /*
-         * Sanity-check: shared interrupts should REALLY pass in
-         * a real dev-ID, otherwise we'll have trouble later trying
-         * to figure out which interrupt is which (messes up the
-         * interrupt freeing logic etc).
-         */
-        if (irqflags & SA_SHIRQ) {
-                if (!dev_id)
-                        printk("Bad boy: %s (at 0x%x) called us without a dev_id!\n", devname, (&irq)[-1]);
-        }
-#endif
-
-        if (irq >= NR_IRQS)
-                return -EINVAL;
-        if (!handler)
-                return -EINVAL;
-
-        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);
-
-/**
- *      free_irq - free an interrupt
- *      @irq: Interrupt line to free
- *      @dev_id: Device identity to free
- *
- *      Remove an interrupt handler. The handler is removed and if the
- *      interrupt line is no longer in use by any driver it is disabled.
- *      On a shared IRQ the caller must ensure the interrupt is disabled
- *      on the card it drives before calling this function. The function
- *      does not return until any executing interrupts for this IRQ
- *      have completed.
- *
- *      This function may be called from interrupt context. 
- *
- *      Bugs: Attempting to free an irq in a handler for the same irq hangs
- *            the machine.
- */
- 
-void free_irq(unsigned int irq, void *dev_id)
-{
-        irq_desc_t *desc;
-        struct irqaction **p;
-        unsigned long flags;
-
-        if (irq >= NR_IRQS)
-                return;
-
-        desc = irq_desc + irq;
-        spin_lock_irqsave(&desc->lock,flags);
-        p = &desc->action;
-        for (;;) {
-                struct irqaction * action = *p;
-                if (action) {
-                        struct irqaction **pp = p;
-                        p = &action->next;
-                        if (action->dev_id != dev_id)
-                                continue;
-
-                        /* Found it - now remove it from the list of entries */
-                        *pp = action->next;
-                        if (!desc->action) {
-                                desc->status |= IRQ_DISABLED;
-                                desc->handler->shutdown(irq);
-                        }
-                        spin_unlock_irqrestore(&desc->lock,flags);
-
-                        synchronize_irq(irq);
-                        kfree(action);
-                        return;
-                }
-                printk("Trying to free free IRQ%d\n",irq);
-                spin_unlock_irqrestore(&desc->lock,flags);
-                return;
-        }
-}
-
-EXPORT_SYMBOL(free_irq);
-
-/*
- * IRQ autodetection code..
- *
- * This depends on the fact that any interrupt that
- * comes in on to an unassigned handler will get stuck
- * with "IRQ_WAITING" cleared and the interrupt
- * disabled.
- */
-
-static DECLARE_MUTEX(probe_sem);
-
-/**
- *      probe_irq_on    - begin an interrupt autodetect
- *
- *      Commence probing for an interrupt. The interrupts are scanned
- *      and a mask of potential interrupt lines is returned.
- *
- */
- 
-unsigned long probe_irq_on(void)
-{
-        unsigned int i;
-        irq_desc_t *desc;
-        unsigned long val;
-        unsigned long delay;
-
-        down(&probe_sem);
-        /* 
-         * something may have generated an irq long ago and we want to
-         * flush such a longstanding irq before considering it as spurious. 
-         */
-        for (i = NR_IRQS-1; i > 0; i--)  {
-                desc = irq_desc + i;
-
-                spin_lock_irq(&desc->lock);
-                if (!irq_desc[i].action) 
-                        irq_desc[i].handler->startup(i);
-                spin_unlock_irq(&desc->lock);
-        }
-
-        /* Wait for longstanding interrupts to trigger. */
-        for (delay = jiffies + HZ/50; time_after(delay, jiffies); )
-                /* about 20ms delay */ barrier();
-
-        /*
-         * enable any unassigned irqs
-         * (we must startup again here because if a longstanding irq
-         * happened in the previous stage, it may have masked itself)
-         */
-        for (i = NR_IRQS-1; i > 0; i--) {
-                desc = irq_desc + i;
-
-                spin_lock_irq(&desc->lock);
-                if (!desc->action) {
-                        desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
-                        if (desc->handler->startup(i))
-                                desc->status |= IRQ_PENDING;
-                }
-                spin_unlock_irq(&desc->lock);
-        }
-
-        /*
-         * Wait for spurious interrupts to trigger
-         */
-        for (delay = jiffies + HZ/10; time_after(delay, jiffies); )
-                /* about 100ms delay */ barrier();
-
-        /*
-         * Now filter out any obviously spurious interrupts
-         */
-        val = 0;
-        for (i = 0; i < NR_IRQS; i++) {
-                irq_desc_t *desc = irq_desc + i;
-                unsigned int status;
-
-                spin_lock_irq(&desc->lock);
-                status = desc->status;
-
-                if (status & IRQ_AUTODETECT) {
-                        /* It triggered already - consider it spurious. */
-                        if (!(status & IRQ_WAITING)) {
-                                desc->status = status & ~IRQ_AUTODETECT;
-                                desc->handler->shutdown(i);
-                        } else
-                                if (i < 32)
-                                        val |= 1 << i;
-                }
-                spin_unlock_irq(&desc->lock);
-        }
-
-        return val;
-}
-
-EXPORT_SYMBOL(probe_irq_on);
-
-/*
- * Return a mask of triggered interrupts (this
- * can handle only legacy ISA interrupts).
- */
- 
-/**
- *      probe_irq_mask - scan a bitmap of interrupt lines
- *      @val:   mask of interrupts to consider
- *
- *      Scan the ISA bus interrupt lines and return a bitmap of
- *      active interrupts. The interrupt probe logic state is then
- *      returned to its previous value.
- *
- *      Note: we need to scan all the irq's even though we will
- *      only return ISA irq numbers - just so that we reset them
- *      all to a known state.
- */
-unsigned int probe_irq_mask(unsigned long val)
-{
-        int i;
-        unsigned int mask;
-
-        mask = 0;
-        for (i = 0; i < NR_IRQS; i++) {
-                irq_desc_t *desc = irq_desc + i;
-                unsigned int status;
-
-                spin_lock_irq(&desc->lock);
-                status = desc->status;
-
-                if (status & IRQ_AUTODETECT) {
-                        if (i < 16 && !(status & IRQ_WAITING))
-                                mask |= 1 << i;
-
-                        desc->status = status & ~IRQ_AUTODETECT;
-                        desc->handler->shutdown(i);
-                }
-                spin_unlock_irq(&desc->lock);
-        }
-        up(&probe_sem);
-
-        return mask & val;
-}
-
-/*
- * Return the one interrupt that triggered (this can
- * handle any interrupt source).
- */
-
-/**
- *      probe_irq_off   - end an interrupt autodetect
- *      @val: mask of potential interrupts (unused)
- *
- *      Scans the unused interrupt lines and returns the line which
- *      appears to have triggered the interrupt. If no interrupt was
- *      found then zero is returned. If more than one interrupt is
- *      found then minus the first candidate is returned to indicate
- *      their is doubt.
- *
- *      The interrupt probe logic state is returned to its previous
- *      value.
- *
- *      BUGS: When used in a module (which arguably shouldnt happen)
- *      nothing prevents two IRQ probe callers from overlapping. The
- *      results of this are non-optimal.
- */
- 
-int probe_irq_off(unsigned long val)
-{
-        int i, irq_found, nr_irqs;
-
-        nr_irqs = 0;
-        irq_found = 0;
-        for (i = 0; i < NR_IRQS; i++) {
-                irq_desc_t *desc = irq_desc + i;
-                unsigned int status;
-
-                spin_lock_irq(&desc->lock);
-                status = desc->status;
-
-                if (status & IRQ_AUTODETECT) {
-                        if (!(status & IRQ_WAITING)) {
-                                if (!nr_irqs)
-                                        irq_found = i;
-                                nr_irqs++;
-                        }
-                        desc->status = status & ~IRQ_AUTODETECT;
-                        desc->handler->shutdown(i);
-                }
-                spin_unlock_irq(&desc->lock);
-        }
-        up(&probe_sem);
-
-        if (nr_irqs > 1)
-                irq_found = -irq_found;
-        return irq_found;
-}
-
-EXPORT_SYMBOL(probe_irq_off);
-
-/* this was setup_x86_irq but it seems pretty generic */
-int setup_irq(unsigned int irq, struct irqaction * new)
-{
-        int shared = 0;
-        unsigned long flags;
-        struct irqaction *old, **p;
-        irq_desc_t *desc = irq_desc + irq;
-
-        /*
-         * Some drivers like serial.c use request_irq() heavily,
-         * so we have to be careful not to interfere with a
-         * running system.
-         */
-        if (new->flags & SA_SAMPLE_RANDOM) {
-                /*
-                 * This function might sleep, we want to call it first,
-                 * outside of the atomic block.
-                 * Yes, this might clear the entropy pool if the wrong
-                 * driver is attempted to be loaded, without actually
-                 * installing a new handler, but is this really a problem,
-                 * only the sysadmin is able to do this.
-                 */
-                rand_initialize_irq(irq);
-        }
-
-        /*
-         * The following block of code has to be executed atomically
-         */
-        spin_lock_irqsave(&desc->lock,flags);
-        p = &desc->action;
-        if ((old = *p) != NULL) {
-                /* Can't share interrupts unless both agree to */
-                if (!(old->flags & new->flags & SA_SHIRQ)) {
-                        spin_unlock_irqrestore(&desc->lock,flags);
-                        return -EBUSY;
-                }
-
-                /* add new interrupt at end of irq queue */
-                do {
-                        p = &old->next;
-                        old = *p;
-                } while (old);
-                shared = 1;
-        }
-
-        *p = new;
-
-        if (!shared) {
-                desc->depth = 0;
-                desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS);
-                desc->handler->startup(irq);
-        }
-        spin_unlock_irqrestore(&desc->lock,flags);
-
-        /* register_irq_proc(irq); */
-        return 0;
-}
-
 /* Initialize irq handling for IRQs.
    BASE_IRQ, BASE_IRQ+INTERVAL, ..., BASE_IRQ+NUM*INTERVAL
    to IRQ_TYPE.  An IRQ_TYPE of 0 means to use a generic interrupt type.  */
@@ -741,9 +121,3 @@ init_irq_handlers (int base_irq, int num, int interval,
                 base_irq += interval;
         }
 }
-
-#if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL)
-void init_irq_proc(void)
-{
-}
-#endif /* CONFIG_PROC_FS && CONFIG_SYSCTL */