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132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/*
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* GT641xx IRQ routines.
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*
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* Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 02110-1301 USA
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*/
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#include <linux/hardirq.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <asm/gt64120.h>
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#define GT641XX_IRQ_TO_BIT(irq) (1U << (irq - GT641XX_IRQ_BASE))
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static DEFINE_RAW_SPINLOCK(gt641xx_irq_lock);
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static void ack_gt641xx_irq(unsigned int irq)
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{
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unsigned long flags;
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u32 cause;
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raw_spin_lock_irqsave(>641xx_irq_lock, flags);
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cause = GT_READ(GT_INTRCAUSE_OFS);
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cause &= ~GT641XX_IRQ_TO_BIT(irq);
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GT_WRITE(GT_INTRCAUSE_OFS, cause);
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raw_spin_unlock_irqrestore(>641xx_irq_lock, flags);
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}
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static void mask_gt641xx_irq(unsigned int irq)
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{
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unsigned long flags;
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u32 mask;
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raw_spin_lock_irqsave(>641xx_irq_lock, flags);
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mask = GT_READ(GT_INTRMASK_OFS);
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mask &= ~GT641XX_IRQ_TO_BIT(irq);
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GT_WRITE(GT_INTRMASK_OFS, mask);
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raw_spin_unlock_irqrestore(>641xx_irq_lock, flags);
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}
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static void mask_ack_gt641xx_irq(unsigned int irq)
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{
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unsigned long flags;
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u32 cause, mask;
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raw_spin_lock_irqsave(>641xx_irq_lock, flags);
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mask = GT_READ(GT_INTRMASK_OFS);
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mask &= ~GT641XX_IRQ_TO_BIT(irq);
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GT_WRITE(GT_INTRMASK_OFS, mask);
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cause = GT_READ(GT_INTRCAUSE_OFS);
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cause &= ~GT641XX_IRQ_TO_BIT(irq);
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GT_WRITE(GT_INTRCAUSE_OFS, cause);
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raw_spin_unlock_irqrestore(>641xx_irq_lock, flags);
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}
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static void unmask_gt641xx_irq(unsigned int irq)
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{
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unsigned long flags;
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u32 mask;
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raw_spin_lock_irqsave(>641xx_irq_lock, flags);
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mask = GT_READ(GT_INTRMASK_OFS);
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mask |= GT641XX_IRQ_TO_BIT(irq);
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GT_WRITE(GT_INTRMASK_OFS, mask);
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raw_spin_unlock_irqrestore(>641xx_irq_lock, flags);
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}
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static struct irq_chip gt641xx_irq_chip = {
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.name = "GT641xx",
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.ack = ack_gt641xx_irq,
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.mask = mask_gt641xx_irq,
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.mask_ack = mask_ack_gt641xx_irq,
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.unmask = unmask_gt641xx_irq,
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};
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void gt641xx_irq_dispatch(void)
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{
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u32 cause, mask;
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int i;
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cause = GT_READ(GT_INTRCAUSE_OFS);
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mask = GT_READ(GT_INTRMASK_OFS);
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cause &= mask;
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/*
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* bit0 : logical or of all the interrupt bits.
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* bit30: logical or of bits[29:26,20:1].
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* bit31: logical or of bits[25:1].
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*/
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for (i = 1; i < 30; i++) {
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if (cause & (1U << i)) {
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do_IRQ(GT641XX_IRQ_BASE + i);
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return;
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}
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}
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atomic_inc(&irq_err_count);
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}
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void __init gt641xx_irq_init(void)
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{
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int i;
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GT_WRITE(GT_INTRMASK_OFS, 0);
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GT_WRITE(GT_INTRCAUSE_OFS, 0);
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/*
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* bit0 : logical or of all the interrupt bits.
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* bit30: logical or of bits[29:26,20:1].
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* bit31: logical or of bits[25:1].
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*/
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for (i = 1; i < 30; i++)
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set_irq_chip_and_handler(GT641XX_IRQ_BASE + i,
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>641xx_irq_chip, handle_level_irq);
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}
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