[ARM] Separate VIC (vectored interrupt controller) support from Versatile

Other machines may wish to make use of the VIC support code, so
move it to arch/arm/common.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

5 files changed, 104 insertions, 55 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 50b9afa8ae6d..c4d585e2de7a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -180,6 +180,7 @@ config ARCH_OMAP
 config ARCH_VERSATILE
         bool "Versatile"
         select ARM_AMBA
+        select ARM_VIC
         select ICST307
         help
           This enables support for ARM Ltd Versatile board.
diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index d7509c7a3c5e..5e34ca6d38b6 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -1,7 +1,10 @@
-config ICST525
+config ARM_GIC
         bool
 
-config ARM_GIC
+config ARM_VIC
+        bool
+
+config ICST525
         bool
 
 config ICST307
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
index ec8d17c96906..c81a2ff6b5be 100644
--- a/arch/arm/common/Makefile
+++ b/arch/arm/common/Makefile
@@ -4,6 +4,7 @@
 
 obj-y                           += rtctime.o
 obj-$(CONFIG_ARM_GIC)           += gic.o
+obj-$(CONFIG_ARM_VIC)           += vic.o
 obj-$(CONFIG_ICST525)           += icst525.o
 obj-$(CONFIG_ICST307)           += icst307.o
 obj-$(CONFIG_SA1111)            += sa1111.o
diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
new file mode 100644
index 000000000000..a45ed1687a59
--- /dev/null
+++ b/arch/arm/common/vic.c
@@ -0,0 +1,92 @@
+/*
+ *  linux/arch/arm/common/vic.c
+ *
+ *  Copyright (C) 1999 - 2003 ARM Limited
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/init.h>
+#include <linux/list.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <asm/hardware/vic.h>
+
+static void __iomem *vic_base;
+
+static void vic_mask_irq(unsigned int irq)
+{
+        irq -= IRQ_VIC_START;
+        writel(1 << irq, vic_base + VIC_INT_ENABLE_CLEAR);
+}
+
+static void vic_unmask_irq(unsigned int irq)
+{
+        irq -= IRQ_VIC_START;
+        writel(1 << irq, vic_base + VIC_INT_ENABLE);
+}
+
+static struct irqchip vic_chip = {
+        .ack    = vic_mask_irq,
+        .mask   = vic_mask_irq,
+        .unmask = vic_unmask_irq,
+};
+
+void __init vic_init(void __iomem *base, u32 vic_sources)
+{
+        unsigned int i;
+
+        vic_base = base;
+
+        /* Disable all interrupts initially. */
+
+        writel(0, vic_base + VIC_INT_SELECT);
+        writel(0, vic_base + VIC_INT_ENABLE);
+        writel(~0, vic_base + VIC_INT_ENABLE_CLEAR);
+        writel(0, vic_base + VIC_IRQ_STATUS);
+        writel(0, vic_base + VIC_ITCR);
+        writel(~0, vic_base + VIC_INT_SOFT_CLEAR);
+
+        /*
+         * Make sure we clear all existing interrupts
+         */
+        writel(0, vic_base + VIC_VECT_ADDR);
+        for (i = 0; i < 19; i++) {
+                unsigned int value;
+
+                value = readl(vic_base + VIC_VECT_ADDR);
+                writel(value, vic_base + VIC_VECT_ADDR);
+        }
+
+        for (i = 0; i < 16; i++) {
+                void __iomem *reg = vic_base + VIC_VECT_CNTL0 + (i * 4);
+                writel(VIC_VECT_CNTL_ENABLE | i, reg);
+        }
+
+        writel(32, vic_base + VIC_DEF_VECT_ADDR);
+
+        for (i = 0; i < 32; i++) {
+                unsigned int irq = IRQ_VIC_START + i;
+
+                set_irq_chip(irq, &vic_chip);
+
+                if (vic_sources & (1 << i)) {
+                        set_irq_handler(irq, do_level_IRQ);
+                        set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+                }
+        }
+}
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index 90023745b23a..9ebbe808b41d 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -35,6 +35,7 @@
 #include <asm/leds.h>
 #include <asm/hardware/arm_timer.h>
 #include <asm/hardware/icst307.h>
+#include <asm/hardware/vic.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/flash.h>
@@ -56,24 +57,6 @@
 #define VA_VIC_BASE             __io_address(VERSATILE_VIC_BASE)
 #define VA_SIC_BASE             __io_address(VERSATILE_SIC_BASE)
 
-static void vic_mask_irq(unsigned int irq)
-{
-        irq -= IRQ_VIC_START;
-        writel(1 << irq, VA_VIC_BASE + VIC_IRQ_ENABLE_CLEAR);
-}
-
-static void vic_unmask_irq(unsigned int irq)
-{
-        irq -= IRQ_VIC_START;
-        writel(1 << irq, VA_VIC_BASE + VIC_IRQ_ENABLE);
-}
-
-static struct irqchip vic_chip = {
-        .ack    = vic_mask_irq,
-        .mask   = vic_mask_irq,
-        .unmask = vic_unmask_irq,
-};
-
 static void sic_mask_irq(unsigned int irq)
 {
         irq -= IRQ_SIC_START;
@@ -127,43 +110,12 @@ sic_handle_irq(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 
 void __init versatile_init_irq(void)
 {
-        unsigned int i, value;
-
-        /* Disable all interrupts initially. */
+        unsigned int i;
 
-        writel(0, VA_VIC_BASE + VIC_INT_SELECT);
-        writel(0, VA_VIC_BASE + VIC_IRQ_ENABLE);
-        writel(~0, VA_VIC_BASE + VIC_IRQ_ENABLE_CLEAR);
-        writel(0, VA_VIC_BASE + VIC_IRQ_STATUS);
-        writel(0, VA_VIC_BASE + VIC_ITCR);
-        writel(~0, VA_VIC_BASE + VIC_IRQ_SOFT_CLEAR);
-
-        /*
-         * Make sure we clear all existing interrupts
-         */
-        writel(0, VA_VIC_BASE + VIC_VECT_ADDR);
-        for (i = 0; i < 19; i++) {
-                value = readl(VA_VIC_BASE + VIC_VECT_ADDR);
-                writel(value, VA_VIC_BASE + VIC_VECT_ADDR);
-        }
-
-        for (i = 0; i < 16; i++) {
-                value = readl(VA_VIC_BASE + VIC_VECT_CNTL0 + (i * 4));
-                writel(value | VICVectCntl_Enable | i, VA_VIC_BASE + VIC_VECT_CNTL0 + (i * 4));
-        }
-
-        writel(32, VA_VIC_BASE + VIC_DEF_VECT_ADDR);
-
-        for (i = IRQ_VIC_START; i <= IRQ_VIC_END; i++) {
-                if (i != IRQ_VICSOURCE31) {
-                        set_irq_chip(i, &vic_chip);
-                        set_irq_handler(i, do_level_IRQ);
-                        set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
-                }
-        }
+        vic_init(VA_VIC_BASE, ~(1 << 31));
 
         set_irq_handler(IRQ_VICSOURCE31, sic_handle_irq);
-        vic_unmask_irq(IRQ_VICSOURCE31);
+        enable_irq(IRQ_VICSOURCE31);
 
         /* Do second interrupt controller */
         writel(~0, VA_SIC_BASE + SIC_IRQ_ENABLE_CLEAR);
@@ -877,7 +829,7 @@ static unsigned long versatile_gettimeoffset(void)
         ticks2 = readl(TIMER0_VA_BASE + TIMER_VALUE) & 0xffff;
         do {
                 ticks1 = ticks2;
-                status = __raw_readl(VA_IC_BASE + VIC_IRQ_RAW_STATUS);
+                status = __raw_readl(VA_IC_BASE + VIC_RAW_STATUS);
                 ticks2 = readl(TIMER0_VA_BASE + TIMER_VALUE) & 0xffff;
         } while (ticks2 > ticks1);