/* * linux/arch/arm/mach-w90x900/irq.c * * based on linux/arch/arm/plat-s3c24xx/irq.c by Ben Dooks * * Copyright (c) 2008 Nuvoton technology corporation * All rights reserved. * * Wan ZongShun <mcuos.com@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation;version 2 of the License. * */ #include <linux/init.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/ioport.h> #include <linux/ptrace.h> #include <linux/sysdev.h> #include <linux/io.h> #include <asm/irq.h> #include <asm/mach/irq.h> #include <mach/hardware.h> #include <mach/regs-irq.h> struct group_irq { unsigned long gpen; unsigned int enabled; void (*enable)(struct group_irq *, int enable); }; static DEFINE_SPINLOCK(groupirq_lock); #define DEFINE_GROUP(_name, _ctrlbit, _num) \ struct group_irq group_##_name = { \ .enable = nuc900_group_enable, \ .gpen = ((1 << _num) - 1) << _ctrlbit, \ } static void nuc900_group_enable(struct group_irq *gpirq, int enable); static DEFINE_GROUP(nirq0, 0, 4); static DEFINE_GROUP(nirq1, 4, 4); static DEFINE_GROUP(usbh, 8, 2); static DEFINE_GROUP(ottimer, 16, 3); static DEFINE_GROUP(gdma, 20, 2); static DEFINE_GROUP(sc, 24, 2); static DEFINE_GROUP(i2c, 26, 2); static DEFINE_GROUP(ps2, 28, 2); static int group_irq_enable(struct group_irq *group_irq) { unsigned long flags; spin_lock_irqsave(&groupirq_lock, flags); if (group_irq->enabled++ == 0) (group_irq->enable)(group_irq, 1); spin_unlock_irqrestore(&groupirq_lock, flags); return 0; } static void group_irq_disable(struct group_irq *group_irq) { unsigned long flags; WARN_ON(group_irq->enabled == 0); spin_lock_irqsave(&groupirq_lock, flags); if (--group_irq->enabled == 0) (group_irq->enable)(group_irq, 0); spin_unlock_irqrestore(&groupirq_lock, flags); } static void nuc900_group_enable(struct group_irq *gpirq, int enable) { unsigned int groupen = gpirq->gpen; unsigned long regval; regval = __raw_readl(REG_AIC_GEN); if (enable) regval |= groupen; else regval &= ~groupen; __raw_writel(regval, REG_AIC_GEN); } static void nuc900_irq_mask(unsigned int irq) { struct group_irq *group_irq; group_irq = NULL; __raw_writel(1 << irq, REG_AIC_MDCR); switch (irq) { case IRQ_GROUP0: group_irq = &group_nirq0; break; case IRQ_GROUP1: group_irq = &group_nirq1; break; case IRQ_USBH: group_irq = &group_usbh; break; case IRQ_T_INT_GROUP: group_irq = &group_ottimer; break; case IRQ_GDMAGROUP: group_irq = &group_gdma; break; case IRQ_SCGROUP: group_irq = &group_sc; break; case IRQ_I2CGROUP: group_irq = &group_i2c; break; case IRQ_P2SGROUP: group_irq = &group_ps2; break; } if (group_irq) group_irq_disable(group_irq); } /* * By the w90p910 spec,any irq,only write 1 * to REG_AIC_EOSCR for ACK */ static void nuc900_irq_ack(unsigned int irq) { __raw_writel(0x01, REG_AIC_EOSCR); } static void nuc900_irq_unmask(unsigned int irq) { struct group_irq *group_irq; group_irq = NULL; __raw_writel(1 << irq, REG_AIC_MECR); switch (irq) { case IRQ_GROUP0: group_irq = &group_nirq0; break; case IRQ_GROUP1: group_irq = &group_nirq1; break; case IRQ_USBH: group_irq = &group_usbh; break; case IRQ_T_INT_GROUP: group_irq = &group_ottimer; break; case IRQ_GDMAGROUP: group_irq = &group_gdma; break; case IRQ_SCGROUP: group_irq = &group_sc; break; case IRQ_I2CGROUP: group_irq = &group_i2c; break; case IRQ_P2SGROUP: group_irq = &group_ps2; break; } if (group_irq) group_irq_enable(group_irq); } static struct irq_chip nuc900_irq_chip = { .ack = nuc900_irq_ack, .mask = nuc900_irq_mask, .unmask = nuc900_irq_unmask, }; void __init nuc900_init_irq(void) { int irqno; __raw_writel(0xFFFFFFFE, REG_AIC_MDCR); for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) { set_irq_chip(irqno, &nuc900_irq_chip); set_irq_handler(irqno, handle_level_irq); set_irq_flags(irqno, IRQF_VALID); } }