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Diffstat (limited to 'arch/mips/kernel/irq_cpu.c')
-rw-r--r--arch/mips/kernel/irq_cpu.c91
1 files changed, 77 insertions, 14 deletions
diff --git a/arch/mips/kernel/irq_cpu.c b/arch/mips/kernel/irq_cpu.c
index 2b936cf1ef70..5db67e31ec1a 100644
--- a/arch/mips/kernel/irq_cpu.c
+++ b/arch/mips/kernel/irq_cpu.c
@@ -3,6 +3,8 @@
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
*
* Copyright (C) 2001 Ralf Baechle
+ * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
+ * Author: Maciej W. Rozycki <macro@mips.com>
*
* This file define the irq handler for MIPS CPU interrupts.
*
@@ -31,19 +33,21 @@
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
+#include <asm/mipsmtregs.h>
#include <asm/system.h>
static int mips_cpu_irq_base;
static inline void unmask_mips_irq(unsigned int irq)
{
- clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
set_c0_status(0x100 << (irq - mips_cpu_irq_base));
+ irq_enable_hazard();
}
static inline void mask_mips_irq(unsigned int irq)
{
clear_c0_status(0x100 << (irq - mips_cpu_irq_base));
+ irq_disable_hazard();
}
static inline void mips_cpu_irq_enable(unsigned int irq)
@@ -52,6 +56,7 @@ static inline void mips_cpu_irq_enable(unsigned int irq)
local_irq_save(flags);
unmask_mips_irq(irq);
+ back_to_back_c0_hazard();
local_irq_restore(flags);
}
@@ -61,6 +66,7 @@ static void mips_cpu_irq_disable(unsigned int irq)
local_irq_save(flags);
mask_mips_irq(irq);
+ back_to_back_c0_hazard();
local_irq_restore(flags);
}
@@ -71,7 +77,7 @@ static unsigned int mips_cpu_irq_startup(unsigned int irq)
return 0;
}
-#define mips_cpu_irq_shutdown mips_cpu_irq_disable
+#define mips_cpu_irq_shutdown mips_cpu_irq_disable
/*
* While we ack the interrupt interrupts are disabled and thus we don't need
@@ -79,9 +85,6 @@ static unsigned int mips_cpu_irq_startup(unsigned int irq)
*/
static void mips_cpu_irq_ack(unsigned int irq)
{
- /* Only necessary for soft interrupts */
- clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
-
mask_mips_irq(irq);
}
@@ -92,22 +95,82 @@ static void mips_cpu_irq_end(unsigned int irq)
}
static hw_irq_controller mips_cpu_irq_controller = {
- "MIPS",
- mips_cpu_irq_startup,
- mips_cpu_irq_shutdown,
- mips_cpu_irq_enable,
- mips_cpu_irq_disable,
- mips_cpu_irq_ack,
- mips_cpu_irq_end,
- NULL /* no affinity stuff for UP */
+ .typename = "MIPS",
+ .startup = mips_cpu_irq_startup,
+ .shutdown = mips_cpu_irq_shutdown,
+ .enable = mips_cpu_irq_enable,
+ .disable = mips_cpu_irq_disable,
+ .ack = mips_cpu_irq_ack,
+ .end = mips_cpu_irq_end,
};
+/*
+ * Basically the same as above but taking care of all the MT stuff
+ */
+
+#define unmask_mips_mt_irq unmask_mips_irq
+#define mask_mips_mt_irq mask_mips_irq
+#define mips_mt_cpu_irq_enable mips_cpu_irq_enable
+#define mips_mt_cpu_irq_disable mips_cpu_irq_disable
+
+static unsigned int mips_mt_cpu_irq_startup(unsigned int irq)
+{
+ unsigned int vpflags = dvpe();
+
+ clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
+ evpe(vpflags);
+ mips_mt_cpu_irq_enable(irq);
+
+ return 0;
+}
+
+#define mips_mt_cpu_irq_shutdown mips_mt_cpu_irq_disable
+
+/*
+ * While we ack the interrupt interrupts are disabled and thus we don't need
+ * to deal with concurrency issues. Same for mips_cpu_irq_end.
+ */
+static void mips_mt_cpu_irq_ack(unsigned int irq)
+{
+ unsigned int vpflags = dvpe();
+ clear_c0_cause(0x100 << (irq - mips_cpu_irq_base));
+ evpe(vpflags);
+ mask_mips_mt_irq(irq);
+}
+
+#define mips_mt_cpu_irq_end mips_cpu_irq_end
+
+static hw_irq_controller mips_mt_cpu_irq_controller = {
+ .typename = "MIPS",
+ .startup = mips_mt_cpu_irq_startup,
+ .shutdown = mips_mt_cpu_irq_shutdown,
+ .enable = mips_mt_cpu_irq_enable,
+ .disable = mips_mt_cpu_irq_disable,
+ .ack = mips_mt_cpu_irq_ack,
+ .end = mips_mt_cpu_irq_end,
+};
void __init mips_cpu_irq_init(int irq_base)
{
int i;
- for (i = irq_base; i < irq_base + 8; i++) {
+ /* Mask interrupts. */
+ clear_c0_status(ST0_IM);
+ clear_c0_cause(CAUSEF_IP);
+
+ /*
+ * Only MT is using the software interrupts currently, so we just
+ * leave them uninitialized for other processors.
+ */
+ if (cpu_has_mipsmt)
+ for (i = irq_base; i < irq_base + 2; i++) {
+ irq_desc[i].status = IRQ_DISABLED;
+ irq_desc[i].action = NULL;
+ irq_desc[i].depth = 1;
+ irq_desc[i].handler = &mips_mt_cpu_irq_controller;
+ }
+
+ for (i = irq_base + 2; i < irq_base + 8; i++) {
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = NULL;
irq_desc[i].depth = 1;