91 lines
2.8 KiB
C
Executable file
91 lines
2.8 KiB
C
Executable file
/*
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* First-level interrupt controller model for Hexagon.
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <linux/interrupt.h>
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#include <asm/irq.h>
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#include <asm/hexagon_vm.h>
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static void mask_irq(struct irq_data *data)
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{
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__vmintop_locdis((long) data->irq);
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}
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static void mask_irq_num(unsigned int irq)
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{
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__vmintop_locdis((long) irq);
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}
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static void unmask_irq(struct irq_data *data)
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{
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__vmintop_locen((long) data->irq);
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}
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/* This is actually all we need for handle_fasteoi_irq */
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static void eoi_irq(struct irq_data *data)
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{
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__vmintop_globen((long) data->irq);
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}
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/* Power mamangement wake call. We don't need this, however,
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* if this is absent, then an -ENXIO error is returned to the
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* msm_serial driver, and it fails to correctly initialize.
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* This is a bug in the msm_serial driver, but, for now, we
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* work around it here, by providing this bogus handler.
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* XXX FIXME!!! remove this when msm_serial is fixed.
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*/
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static int set_wake(struct irq_data *data, unsigned int on)
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{
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return 0;
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}
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static struct irq_chip hexagon_irq_chip = {
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.name = "HEXAGON",
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.irq_mask = mask_irq,
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.irq_unmask = unmask_irq,
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.irq_set_wake = set_wake,
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.irq_eoi = eoi_irq
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};
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/**
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* The hexagon core comes with a first-level interrupt controller
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* with 32 total possible interrupts. When the core is embedded
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* into different systems/platforms, it is typically wrapped by
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* macro cells that provide one or more second-level interrupt
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* controllers that are cascaded into one or more of the first-level
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* interrupts handled here. The precise wiring of these other
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* irqs varies from platform to platform, and are set up & configured
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* in the platform-specific files.
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*
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* The first-level interrupt controller is wrapped by the VM, which
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* virtualizes the interrupt controller for us. It provides a very
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* simple, fast & efficient API, and so the fasteoi handler is
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* appropriate for this case.
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*/
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void __init init_IRQ(void)
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{
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int irq;
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for (irq = 0; irq < HEXAGON_CPUINTS; irq++) {
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mask_irq_num(irq);
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irq_set_chip_and_handler(irq, &hexagon_irq_chip,
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handle_fasteoi_irq);
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}
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}
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