[PATCH] FRV: Use the generic IRQ stuff

Make the FRV arch use the generic IRQ code rather than having its own
routines for doing so.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 74 insertions, 41 deletions

diff --git a/arch/frv/kernel/irq-mb93093.c b/arch/frv/kernel/irq-mb93093.c
index 48b2a6420888..f60db7988e78 100644
--- a/arch/frv/kernel/irq-mb93093.c
+++ b/arch/frv/kernel/irq-mb93093.c
@@ -1,6 +1,6 @@
 /* irq-mb93093.c: MB93093 FPGA interrupt handling
  *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * This program is free software; you can redistribute it and/or
@@ -24,7 +24,6 @@
 #include <asm/delay.h>
 #include <asm/irq.h>
 #include <asm/irc-regs.h>
-#include <asm/irq-routing.h>
 
 #define __reg16(ADDR) (*(volatile unsigned short *)(__region_CS2 + (ADDR)))
 
@@ -33,66 +32,100 @@
 #define __get_IFR()     ({ __reg16(0x02); })
 #define __clr_IFR(M)    do { __reg16(0x02) = ~(M); wmb(); } while(0)
 
-static void frv_fpga_doirq(struct irq_source *source);
-static void frv_fpga_control(struct irq_group *group, int irq, int on);
-
-/*****************************************************************************/
 /*
- * FPGA IRQ multiplexor
+ * off-CPU FPGA PIC operations
  */
-static struct irq_source frv_fpga[4] = {
-#define __FPGA(X, M)                                    \
-        [X] = {                                         \
-                .muxname        = "fpga."#X,            \
-                .irqmask        = M,                    \
-                .doirq          = frv_fpga_doirq,       \
-        }
-
-        __FPGA(0, 0x0700),
-};
+static void frv_fpga_enable(unsigned int irq)
+{
+        uint16_t imr = __get_IMR();
 
-static struct irq_group frv_fpga_irqs = {
-        .first_irq      = IRQ_BASE_FPGA,
-        .control        = frv_fpga_control,
-        .sources = {
-                [ 8] = &frv_fpga[0],
-                [ 9] = &frv_fpga[0],
-                [10] = &frv_fpga[0],
-        },
-};
+        imr &= ~(1 << (irq - IRQ_BASE_FPGA));
 
+        __set_IMR(imr);
+}
 
-static void frv_fpga_control(struct irq_group *group, int index, int on)
+static void frv_fpga_disable(unsigned int irq)
 {
         uint16_t imr = __get_IMR();
 
-        if (on)
-                imr &= ~(1 << index);
-        else
-                imr |= 1 << index;
+        imr |= 1 << (irq - IRQ_BASE_FPGA);
 
         __set_IMR(imr);
 }
 
-static void frv_fpga_doirq(struct irq_source *source)
+static void frv_fpga_ack(unsigned int irq)
+{
+        __clr_IFR(1 << (irq - IRQ_BASE_FPGA));
+}
+
+static void frv_fpga_end(unsigned int irq)
+{
+}
+
+static struct irq_chip frv_fpga_pic = {
+        .name           = "mb93093",
+        .enable         = frv_fpga_enable,
+        .disable        = frv_fpga_disable,
+        .ack            = frv_fpga_ack,
+        .mask           = frv_fpga_disable,
+        .unmask         = frv_fpga_enable,
+        .end            = frv_fpga_end,
+};
+
+/*
+ * FPGA PIC interrupt handler
+ */
+static irqreturn_t fpga_interrupt(int irq, void *_mask, struct pt_regs *regs)
 {
-        uint16_t mask, imr;
+        uint16_t imr, mask = (unsigned long) _mask;
+        irqreturn_t iret = 0;
 
         imr = __get_IMR();
-        mask = source->irqmask & ~imr & __get_IFR();
-        if (mask) {
-                __set_IMR(imr | mask);
-                __clr_IFR(mask);
-                distribute_irqs(&frv_fpga_irqs, mask);
-                __set_IMR(imr);
+        mask = mask & ~imr & __get_IFR();
+
+        /* poll all the triggered IRQs */
+        while (mask) {
+                int irq;
+
+                asm("scan %1,gr0,%0" : "=r"(irq) : "r"(mask));
+                irq = 31 - irq;
+                mask &= ~(1 << irq);
+
+                if (__do_IRQ(IRQ_BASE_FPGA + irq, regs))
+                        iret |= IRQ_HANDLED;
         }
+
+        return iret;
 }
 
+/*
+ * define an interrupt action for each FPGA PIC output
+ * - use dev_id to indicate the FPGA PIC input to output mappings
+ */
+static struct irqaction fpga_irq[1]  = {
+        [0] = {
+                .handler        = fpga_interrupt,
+                .flags          = IRQF_DISABLED,
+                .mask           = CPU_MASK_NONE,
+                .name           = "fpga.0",
+                .dev_id         = (void *) 0x0700UL,
+        }
+};
+
+/*
+ * initialise the motherboard FPGA's PIC
+ */
 void __init fpga_init(void)
 {
+        int irq;
+
+        /* all PIC inputs are all set to be edge triggered */
         __set_IMR(0x0700);
         __clr_IFR(0x0000);
 
-        frv_irq_route_external(&frv_fpga[0], IRQ_CPU_EXTERNAL2);
-        frv_irq_set_group(&frv_fpga_irqs);
+        for (irq = IRQ_BASE_FPGA + 8; irq <= IRQ_BASE_FPGA + 10; irq++)
+                set_irq_chip_and_handler(irq, &frv_fpga_pic, handle_edge_irq);
+
+        /* the FPGA drives external IRQ input #2 on the CPU PIC */
+        setup_irq(IRQ_CPU_EXTERNAL2, &fpga_irq[0]);
 }