217 lines
4.1 KiB
C
217 lines
4.1 KiB
C
/*
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* linux/arch/arm/mach-w90x900/irq.c
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*
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* based on linux/arch/arm/plat-s3c24xx/irq.c by Ben Dooks
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*
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* Copyright (c) 2008 Nuvoton technology corporation
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* All rights reserved.
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*
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* Wan ZongShun <mcuos.com@gmail.com>
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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;version 2 of the License.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/ptrace.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <asm/irq.h>
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#include <asm/mach/irq.h>
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#include <mach/hardware.h>
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#include <mach/regs-irq.h>
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#include "nuc9xx.h"
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struct group_irq {
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unsigned long gpen;
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unsigned int enabled;
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void (*enable)(struct group_irq *, int enable);
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};
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static DEFINE_SPINLOCK(groupirq_lock);
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#define DEFINE_GROUP(_name, _ctrlbit, _num) \
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struct group_irq group_##_name = { \
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.enable = nuc900_group_enable, \
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.gpen = ((1 << _num) - 1) << _ctrlbit, \
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}
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static void nuc900_group_enable(struct group_irq *gpirq, int enable);
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static DEFINE_GROUP(nirq0, 0, 4);
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static DEFINE_GROUP(nirq1, 4, 4);
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static DEFINE_GROUP(usbh, 8, 2);
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static DEFINE_GROUP(ottimer, 16, 3);
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static DEFINE_GROUP(gdma, 20, 2);
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static DEFINE_GROUP(sc, 24, 2);
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static DEFINE_GROUP(i2c, 26, 2);
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static DEFINE_GROUP(ps2, 28, 2);
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static int group_irq_enable(struct group_irq *group_irq)
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{
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unsigned long flags;
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spin_lock_irqsave(&groupirq_lock, flags);
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if (group_irq->enabled++ == 0)
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(group_irq->enable)(group_irq, 1);
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spin_unlock_irqrestore(&groupirq_lock, flags);
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return 0;
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}
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static void group_irq_disable(struct group_irq *group_irq)
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{
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unsigned long flags;
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WARN_ON(group_irq->enabled == 0);
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spin_lock_irqsave(&groupirq_lock, flags);
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if (--group_irq->enabled == 0)
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(group_irq->enable)(group_irq, 0);
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spin_unlock_irqrestore(&groupirq_lock, flags);
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}
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static void nuc900_group_enable(struct group_irq *gpirq, int enable)
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{
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unsigned int groupen = gpirq->gpen;
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unsigned long regval;
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regval = __raw_readl(REG_AIC_GEN);
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if (enable)
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regval |= groupen;
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else
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regval &= ~groupen;
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__raw_writel(regval, REG_AIC_GEN);
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}
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static void nuc900_irq_mask(struct irq_data *d)
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{
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struct group_irq *group_irq;
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group_irq = NULL;
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__raw_writel(1 << d->irq, REG_AIC_MDCR);
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switch (d->irq) {
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case IRQ_GROUP0:
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group_irq = &group_nirq0;
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break;
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case IRQ_GROUP1:
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group_irq = &group_nirq1;
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break;
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case IRQ_USBH:
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group_irq = &group_usbh;
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break;
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case IRQ_T_INT_GROUP:
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group_irq = &group_ottimer;
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break;
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case IRQ_GDMAGROUP:
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group_irq = &group_gdma;
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break;
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case IRQ_SCGROUP:
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group_irq = &group_sc;
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break;
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case IRQ_I2CGROUP:
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group_irq = &group_i2c;
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break;
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case IRQ_P2SGROUP:
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group_irq = &group_ps2;
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break;
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}
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if (group_irq)
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group_irq_disable(group_irq);
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}
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/*
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* By the w90p910 spec,any irq,only write 1
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* to REG_AIC_EOSCR for ACK
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*/
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static void nuc900_irq_ack(struct irq_data *d)
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{
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__raw_writel(0x01, REG_AIC_EOSCR);
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}
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static void nuc900_irq_unmask(struct irq_data *d)
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{
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struct group_irq *group_irq;
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group_irq = NULL;
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__raw_writel(1 << d->irq, REG_AIC_MECR);
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switch (d->irq) {
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case IRQ_GROUP0:
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group_irq = &group_nirq0;
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break;
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case IRQ_GROUP1:
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group_irq = &group_nirq1;
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break;
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case IRQ_USBH:
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group_irq = &group_usbh;
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break;
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case IRQ_T_INT_GROUP:
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group_irq = &group_ottimer;
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break;
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case IRQ_GDMAGROUP:
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group_irq = &group_gdma;
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break;
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case IRQ_SCGROUP:
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group_irq = &group_sc;
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break;
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case IRQ_I2CGROUP:
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group_irq = &group_i2c;
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break;
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case IRQ_P2SGROUP:
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group_irq = &group_ps2;
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break;
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}
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if (group_irq)
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group_irq_enable(group_irq);
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}
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static struct irq_chip nuc900_irq_chip = {
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.irq_ack = nuc900_irq_ack,
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.irq_mask = nuc900_irq_mask,
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.irq_unmask = nuc900_irq_unmask,
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};
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void __init nuc900_init_irq(void)
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{
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int irqno;
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__raw_writel(0xFFFFFFFE, REG_AIC_MDCR);
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for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
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irq_set_chip_and_handler(irqno, &nuc900_irq_chip,
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handle_level_irq);
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irq_clear_status_flags(irqno, IRQ_NOREQUEST);
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}
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}
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