[SPARC64]: Get rid of fast IRQ feature.

The only real user was the assembler floppy interrupt
handler, which does not need to be in assembly.

This makes it so that there are less pieces of code which
know about the internal layout of ivector_table[] and
friends.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 50 insertions, 121 deletions

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 4dcb8af94090..424712577307 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -37,6 +37,7 @@
 #include <asm/uaccess.h>
 #include <asm/cache.h>
 #include <asm/cpudata.h>
+#include <asm/auxio.h>
 
 #ifdef CONFIG_SMP
 static void distribute_irqs(void);
@@ -834,137 +835,65 @@ void handler_irq(int irq, struct pt_regs *regs)
 }
 
 #ifdef CONFIG_BLK_DEV_FD
-extern void floppy_interrupt(int irq, void *dev_cookie, struct pt_regs *regs);
+extern irqreturn_t floppy_interrupt(int, void *, struct pt_regs *);;
 
-void sparc_floppy_irq(int irq, void *dev_cookie, struct pt_regs *regs)
-{
-        struct irqaction *action = *(irq + irq_action);
-        struct ino_bucket *bucket;
-        int cpu = smp_processor_id();
-
-        irq_enter();
-        kstat_this_cpu.irqs[irq]++;
-
-        *(irq_work(cpu, irq)) = 0;
-        bucket = get_ino_in_irqaction(action) + ivector_table;
-
-        bucket->flags |= IBF_INPROGRESS;
-
-        floppy_interrupt(irq, dev_cookie, regs);
-        upa_writel(ICLR_IDLE, bucket->iclr);
-
-        bucket->flags &= ~IBF_INPROGRESS;
-
-        irq_exit();
-}
-#endif
-
-/* The following assumes that the branch lies before the place we
- * are branching to.  This is the case for a trap vector...
- * You have been warned.
- */
-#define SPARC_BRANCH(dest_addr, inst_addr) \
-          (0x10800000 | ((((dest_addr)-(inst_addr))>>2)&0x3fffff))
-
-#define SPARC_NOP (0x01000000)
+/* XXX No easy way to include asm/floppy.h XXX */
+extern unsigned char *pdma_vaddr;
+extern unsigned long pdma_size;
+extern volatile int doing_pdma;
+extern unsigned long fdc_status;
 
-static void install_fast_irq(unsigned int cpu_irq,
-                             irqreturn_t (*handler)(int, void *, struct pt_regs *))
+irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie, struct pt_regs *regs)
 {
-        extern unsigned long sparc64_ttable_tl0;
-        unsigned long ttent = (unsigned long) &sparc64_ttable_tl0;
-        unsigned int *insns;
-
-        ttent += 0x820;
-        ttent += (cpu_irq - 1) << 5;
-        insns = (unsigned int *) ttent;
-        insns[0] = SPARC_BRANCH(((unsigned long) handler),
-                                ((unsigned long)&insns[0]));
-        insns[1] = SPARC_NOP;
-        __asm__ __volatile__("membar #StoreStore; flush %0" : : "r" (ttent));
-}
-
-int request_fast_irq(unsigned int irq,
-                     irqreturn_t (*handler)(int, void *, struct pt_regs *),
-                     unsigned long irqflags, const char *name, void *dev_id)
-{
-        struct irqaction *action;
-        struct ino_bucket *bucket = __bucket(irq);
-        unsigned long flags;
-
-        /* No pil0 dummy buckets allowed here. */
-        if (bucket < &ivector_table[0] ||
-            bucket >= &ivector_table[NUM_IVECS]) {
-                unsigned int *caller;
-
-                __asm__ __volatile__("mov %%i7, %0" : "=r" (caller));
-                printk(KERN_CRIT "request_fast_irq: Old style IRQ registry attempt "
-                       "from %p, irq %08x.\n", caller, irq);
-                return -EINVAL;
-        }       
-        
-        if (!handler)
-                return -EINVAL;
+        if (likely(doing_pdma)) {
+                void __iomem *stat = (void __iomem *) fdc_status;
+                unsigned char *vaddr = pdma_vaddr;
+                unsigned long size = pdma_size;
+                u8 val;
+
+                while (size) {
+                        val = readb(stat);
+                        if (unlikely(!(val & 0x80))) {
+                                pdma_vaddr = vaddr;
+                                pdma_size = size;
+                                return IRQ_HANDLED;
+                        }
+                        if (unlikely(!(val & 0x20))) {
+                                pdma_vaddr = vaddr;
+                                pdma_size = size;
+                                doing_pdma = 0;
+                                goto main_interrupt;
+                        }
+                        if (val & 0x40) {
+                                /* read */
+                                *vaddr++ = readb(stat + 1);
+                        } else {
+                                unsigned char data = *vaddr++;
 
-        if ((bucket->pil == 0) || (bucket->pil == 14)) {
-                printk("request_fast_irq: Trying to register shared IRQ 0 or 14.\n");
-                return -EBUSY;
-        }
+                                /* write */
+                                writeb(data, stat + 1);
+                        }
+                        size--;
+                }
 
-        spin_lock_irqsave(&irq_action_lock, flags);
+                pdma_vaddr = vaddr;
+                pdma_size = size;
 
-        action = *(bucket->pil + 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");
-                printk("request_fast_irq: Trying to register yet already owned.\n");
-                spin_unlock_irqrestore(&irq_action_lock, flags);
-                return -EBUSY;
-        }
+                /* Send Terminal Count pulse to floppy controller. */
+                val = readb(auxio_register);
+                val |= AUXIO_AUX1_FTCNT;
+                writeb(val, auxio_register);
+                val &= AUXIO_AUX1_FTCNT;
+                writeb(val, auxio_register);
 
-        /*
-         * We do not check for SA_SAMPLE_RANDOM in this path. Neither do we
-         * support smp intr affinity in this path.
-         */
-        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", bucket->pil, name);
-        }
-        if (action == NULL)
-                action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
-                                                     GFP_ATOMIC);
-        if (!action) {
-                spin_unlock_irqrestore(&irq_action_lock, flags);
-                return -ENOMEM;
+                doing_pdma = 0;
         }
-        install_fast_irq(bucket->pil, handler);
 
-        bucket->irq_info = action;
-        bucket->flags |= IBF_ACTIVE;
-
-        action->handler = handler;
-        action->flags = irqflags;
-        action->dev_id = NULL;
-        action->name = name;
-        action->next = NULL;
-        put_ino_in_irqaction(action, irq);
-        put_smpaff_in_irqaction(action, CPU_MASK_NONE);
-
-        *(bucket->pil + irq_action) = action;
-        enable_irq(irq);
-
-        spin_unlock_irqrestore(&irq_action_lock, flags);
-
-#ifdef CONFIG_SMP
-        distribute_irqs();
-#endif
-        return 0;
+main_interrupt:
+        return floppy_interrupt(irq, dev_cookie, regs);
 }
+EXPORT_SYMBOL(sparc_floppy_irq);
+#endif
 
 /* We really don't need these at all on the Sparc.  We only have
  * stubs here because they are exported to modules.