[SPARC32]: Fix modular build of floppy driver.

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

arch/sparc/kernel/entry.S

-/* $Id: entry.S,v 1.170 2001/11/13 00:57:05 davem Exp $
- * arch/sparc/kernel/entry.S:  Sparc trap low-level entry points.
+/* arch/sparc/kernel/entry.S:  Sparc trap low-level entry points.
  *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
  * Copyright (C) 1996 Eddie C. Dost   (ecd@skynet.be)
  * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
  * Copyright (C) 1996-1999 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
@@ -129,7 +128,7 @@ trap_low:
 	RESTORE_ALL
 #endif
 
-#ifdef CONFIG_BLK_DEV_FD
+#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
 	.text
 	.align	4
 	.globl	floppy_hardint

arch/sparc/kernel/irq.c

@@ -351,34 +351,14 @@ void handler_irq(int irq, struct pt_regs * regs)
 	set_irq_regs(old_regs);
 }
 
-#ifdef CONFIG_BLK_DEV_FD
-extern void floppy_interrupt(int irq, void *dev_id);
-
-void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
-	struct pt_regs *old_regs;
-	int cpu = smp_processor_id();
-
-	old_regs = set_irq_regs(regs);
-	disable_pil_irq(irq);
-	irq_enter();
-	kstat_cpu(cpu).irqs[irq]++;
-	floppy_interrupt(irq, dev_id);
-	irq_exit();
-	enable_pil_irq(irq);
-	set_irq_regs(old_regs);
-	// XXX Eek, it's totally changed with preempt_count() and such
-	// if (softirq_pending(cpu))
-	//	do_softirq();
-}
-#endif
+#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
 
 /* Fast IRQs on the Sparc can only have one routine attached to them,
  * thus no sharing possible.
  */
-int request_fast_irq(unsigned int irq,
-		     irq_handler_t handler,
-		     unsigned long irqflags, const char *devname)
+static int request_fast_irq(unsigned int irq,
+			    void (*handler)(void),
+			    unsigned long irqflags, const char *devname)
 {
 	struct irqaction *action;
 	unsigned long flags;
@@ -457,7 +437,6 @@ int request_fast_irq(unsigned int irq,
 	 */
 	flush_cache_all();
 
-	action->handler = handler;
 	action->flags = irqflags;
 	cpus_clear(action->mask);
 	action->name = devname;
@@ -475,6 +454,61 @@ int request_fast_irq(unsigned int irq,
 	return ret;
 }
 
+/* These variables are used to access state from the assembler
+ * interrupt handler, floppy_hardint, so we cannot put these in
+ * the floppy driver image because that would not work in the
+ * modular case.
+ */
+volatile unsigned char *fdc_status;
+EXPORT_SYMBOL(fdc_status);
+
+char *pdma_vaddr;
+EXPORT_SYMBOL(pdma_vaddr);
+
+unsigned long pdma_size;
+EXPORT_SYMBOL(pdma_size);
+
+volatile int doing_pdma;
+EXPORT_SYMBOL(doing_pdma);
+
+char *pdma_base;
+EXPORT_SYMBOL(pdma_base);
+
+unsigned long pdma_areasize;
+EXPORT_SYMBOL(pdma_areasize);
+
+extern void floppy_hardint(void);
+
+static irqreturn_t (*floppy_irq_handler)(int irq, void *dev_id);
+
+void sparc_floppy_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct pt_regs *old_regs;
+	int cpu = smp_processor_id();
+
+	old_regs = set_irq_regs(regs);
+	disable_pil_irq(irq);
+	irq_enter();
+	kstat_cpu(cpu).irqs[irq]++;
+	floppy_irq_handler(irq, dev_id);
+	irq_exit();
+	enable_pil_irq(irq);
+	set_irq_regs(old_regs);
+	// XXX Eek, it's totally changed with preempt_count() and such
+	// if (softirq_pending(cpu))
+	//	do_softirq();
+}
+
+int sparc_floppy_request_irq(int irq, unsigned long flags,
+			     irqreturn_t (*irq_handler)(int irq, void *))
+{
+	floppy_irq_handler = irq_handler;
+	return request_fast_irq(irq, floppy_hardint, flags, "floppy");
+}
+EXPORT_SYMBOL(sparc_floppy_request_irq);
+
+#endif
+
 int request_irq(unsigned int irq,
 		irq_handler_t handler,
 		unsigned long irqflags, const char * devname, void *dev_id)

arch/sparc/kernel/sparc_ksyms.c

@@ -143,7 +143,6 @@ EXPORT_SYMBOL(mstk48t02_regs);
 EXPORT_SYMBOL(set_auxio);
 EXPORT_SYMBOL(get_auxio);
 #endif
-EXPORT_SYMBOL(request_fast_irq);
 EXPORT_SYMBOL(io_remap_pfn_range);
   /* P3: iounit_xxx may be needed, sun4d users */
 /* EXPORT_SYMBOL(iounit_map_dma_init); */

include/asm-sparc/floppy.h

@@ -48,7 +48,7 @@ struct sun_flpy_controller {
 
 /* You'll only ever find one controller on a SparcStation anyways. */
 static struct sun_flpy_controller *sun_fdc = NULL;
-volatile unsigned char *fdc_status;
+extern volatile unsigned char *fdc_status;
 
 struct sun_floppy_ops {
 	unsigned char (*fd_inb)(int port);
@@ -225,13 +225,13 @@ static void sun_82077_fd_outb(unsigned char value, int port)
  * underruns.  If non-zero, doing_pdma encodes the direction of
  * the transfer for debugging.  1=read 2=write
  */
-char *pdma_vaddr;
-unsigned long pdma_size;
-volatile int doing_pdma = 0;
+extern char *pdma_vaddr;
+extern unsigned long pdma_size;
+extern volatile int doing_pdma;
 
 /* This is software state */
-char *pdma_base = NULL;
-unsigned long pdma_areasize;
+extern char *pdma_base;
+extern unsigned long pdma_areasize;
 
 /* Common routines to all controller types on the Sparc. */
 static __inline__ void virtual_dma_init(void)
@@ -281,7 +281,8 @@ static __inline__ void sun_fd_enable_dma(void)
 }
 
 /* Our low-level entry point in arch/sparc/kernel/entry.S */
-irqreturn_t floppy_hardint(int irq, void *unused);
+extern int sparc_floppy_request_irq(int irq, unsigned long flags,
+				    irqreturn_t (*irq_handler)(int irq, void *));
 
 static int sun_fd_request_irq(void)
 {
@@ -290,8 +291,9 @@ static int sun_fd_request_irq(void)
 
 	if(!once) {
 		once = 1;
-		error = request_fast_irq(FLOPPY_IRQ, floppy_hardint,
-					 IRQF_DISABLED, "floppy");
+		error = sparc_floppy_request_irq(FLOPPY_IRQ,
+						 IRQF_DISABLED,
+						 floppy_interrupt);
 		return ((error == 0) ? 0 : -1);
 	} else return 0;
 }

include/asm-sparc/irq.h

-/* $Id: irq.h,v 1.32 2000/08/26 02:42:28 anton Exp $
- * irq.h: IRQ registers on the Sparc.
+/* irq.h: IRQ registers on the Sparc.
  *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
  */
 
 #ifndef _SPARC_IRQ_H
@@ -13,6 +12,4 @@
 
 #define irq_canonicalize(irq)	(irq)
 
-extern int request_fast_irq(unsigned int irq, irq_handler_t handler, unsigned long flags, __const__ char *devname);
-
 #endif