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Date: Wed, 7 Nov 2012 10:47:35 +0100
From: Vineet Gupta <Vineet.Gupta1@...opsys.com>
To: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: tglx@...utronix.de, arnd@...db.de,
Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: [RFC PATCH v1 12/31] ARC: Interrupt Handling
Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
---
arch/arc/include/asm/arcregs.h | 3 ++
arch/arc/include/asm/hw_irq.h | 7 ++++
arch/arc/include/asm/irq.h | 25 +++++++++++++
arch/arc/kernel/irq.c | 79 +++++++++++++++++++++++++++++++++++++++-
arch/arc/plat-arcfpga/irq.c | 41 +++++++++++++++++++++
5 files changed, 153 insertions(+), 2 deletions(-)
create mode 100644 arch/arc/include/asm/hw_irq.h
create mode 100644 arch/arc/include/asm/irq.h
create mode 100644 arch/arc/plat-arcfpga/irq.c
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h
index 8ca8faf..3fccb04 100644
--- a/arch/arc/include/asm/arcregs.h
+++ b/arch/arc/include/asm/arcregs.h
@@ -11,6 +11,9 @@
#ifdef __KERNEL__
+/* Build Configuration Registers */
+#define ARC_REG_VECBASE_BCR 0x68
+
/* status32 Bits Positions */
#define STATUS_H_BIT 0 /* CPU Halted */
#define STATUS_E1_BIT 1 /* Int 1 enable */
diff --git a/arch/arc/include/asm/hw_irq.h b/arch/arc/include/asm/hw_irq.h
new file mode 100644
index 0000000..fd565ab
--- /dev/null
+++ b/arch/arc/include/asm/hw_irq.h
@@ -0,0 +1,7 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
diff --git a/arch/arc/include/asm/irq.h b/arch/arc/include/asm/irq.h
new file mode 100644
index 0000000..633416c
--- /dev/null
+++ b/arch/arc/include/asm/irq.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_ARC_IRQ_H
+#define __ASM_ARC_IRQ_H
+
+/* Platform Inependent IRQs */
+#define TIMER0_IRQ 3
+#define TIMER1_IRQ 4
+
+#include <asm-generic/irq.h>
+
+extern void __init arc_init_IRQ(void);
+extern void __init plat_init_IRQ(void);
+extern int __init get_hw_config_num_irq(void);
+
+void __cpuinit arc_clockevent_init(void);
+void __cpuinit arc_clock_counter_setup(void);
+
+#endif
diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
index 16fcbe8..03a125c 100644
--- a/arch/arc/kernel/irq.c
+++ b/arch/arc/kernel/irq.c
@@ -9,8 +9,83 @@
#include <linux/interrupt.h>
#include <linux/module.h>
-#include <asm/irqflags.h>
-#include <asm/arcregs.h>
+#include <asm/sections.h>
+#include <asm/irq.h>
+
+/*
+ * Early Interrupt sub-system setup
+ * -Called very early (start_kernel -> setup_arch -> setup_processor)
+ * -Platform Independent (must for any ARC700)
+ * -Needed for each CPU (hence not foldable into init_IRQ)
+ *
+ * what it does ?
+ * -setup Vector Table Base Reg - in case Linux not linked at 0x8000_0000
+ * -Disable all IRQs (on CPU side)
+ */
+void __init arc_init_IRQ(void)
+{
+ int level_mask = level_mask;
+
+ write_aux_reg(AUX_INTR_VEC_BASE, _int_vec_base_lds);
+
+ /* Disable all IRQs: enable them as devices request */
+ write_aux_reg(AUX_IENABLE, 0);
+}
+
+/*
+ * Late Interrupt system init called from start_kernel for Boot CPU only
+ *
+ * Since slab must already be initialized, platforms can start doing any
+ * needed request_irq( )s
+ */
+void __init init_IRQ(void)
+{
+ const int irq = TIMER0_IRQ;
+
+ /*
+ * Each CPU needs to register irq of it's private TIMER0.
+ * The APIs request_percpu_irq()/enable_percpu_irq() will not be
+ * functional, if we don't "prep" the generic IRQ sub-system with
+ * the following:
+ * -Ensure that devid passed to request_percpu_irq() is indeed per cpu
+ * -disable NOAUTOEN, w/o which the device handler never gets called
+ */
+ irq_set_percpu_devid(irq);
+ irq_modify_status(irq, IRQ_NOAUTOEN, 0);
+
+ plat_init_IRQ();
+}
+
+/*
+ * "C" Entry point for any ARC ISR, called from low level vector handler
+ */
+void arch_do_IRQ(unsigned int irq, struct pt_regs *regs)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+
+ irq_enter();
+ generic_handle_irq(irq);
+ irq_exit();
+ set_irq_regs(old_regs);
+}
+
+int __init get_hw_config_num_irq(void)
+{
+ uint32_t val = read_aux_reg(ARC_REG_VECBASE_BCR);
+
+ switch (val & 0x03) {
+ case 0:
+ return 16;
+ case 1:
+ return 32;
+ case 2:
+ return 8;
+ default:
+ return 0;
+ }
+
+ return 0;
+}
void arch_local_irq_enable(void)
{
diff --git a/arch/arc/plat-arcfpga/irq.c b/arch/arc/plat-arcfpga/irq.c
new file mode 100644
index 0000000..a308057
--- /dev/null
+++ b/arch/arc/plat-arcfpga/irq.c
@@ -0,0 +1,41 @@
+/*
+ * ARC FPGA Platform IRQ hookups
+ *
+ * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <plat/memmap.h>
+
+static void arc_mask_irq(struct irq_data *data)
+{
+ arch_mask_irq(data->irq);
+}
+
+static void arc_unmask_irq(struct irq_data *data)
+{
+ arch_unmask_irq(data->irq);
+}
+
+/*
+ * There's no off-chip Interrupt Controller in the FPGA builds
+ * Below sufficies a simple model for the on-chip controller, with
+ * all interrupts being level triggered.
+ */
+static struct irq_chip fpga_chip = {
+ .irq_mask = arc_mask_irq,
+ .irq_unmask = arc_unmask_irq,
+};
+
+void __init plat_init_IRQ(void)
+{
+ int i;
+
+ for (i = 0; i < NR_IRQS; i++)
+ irq_set_chip_and_handler(i, &fpga_chip, handle_level_irq);
+}
--
1.7.4.1
--
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