| /* |
| * arch/arm/mach-ns9xxx/irq.c |
| * |
| * Copyright (C) 2006,2007 by Digi International Inc. |
| * All rights reserved. |
| * |
| * 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 <linux/kernel_stat.h> |
| #include <asm/io.h> |
| #include <asm/mach/irq.h> |
| #include <asm/mach-types.h> |
| #include <asm/arch-ns9xxx/regs-sys-common.h> |
| #include <asm/arch-ns9xxx/irqs.h> |
| #include <asm/arch-ns9xxx/board.h> |
| |
| #include "generic.h" |
| |
| static void ns9xxx_mask_irq(unsigned int irq) |
| { |
| /* XXX: better use cpp symbols */ |
| u32 ic = __raw_readl(SYS_IC(irq / 4)); |
| ic &= ~(1 << (7 + 8 * (3 - (irq & 3)))); |
| __raw_writel(ic, SYS_IC(irq / 4)); |
| } |
| |
| static void ns9xxx_ack_irq(unsigned int irq) |
| { |
| __raw_writel(0, SYS_ISRADDR); |
| } |
| |
| static void ns9xxx_maskack_irq(unsigned int irq) |
| { |
| ns9xxx_mask_irq(irq); |
| ns9xxx_ack_irq(irq); |
| } |
| |
| static void ns9xxx_unmask_irq(unsigned int irq) |
| { |
| /* XXX: better use cpp symbols */ |
| u32 ic = __raw_readl(SYS_IC(irq / 4)); |
| ic |= 1 << (7 + 8 * (3 - (irq & 3))); |
| __raw_writel(ic, SYS_IC(irq / 4)); |
| } |
| |
| static struct irq_chip ns9xxx_chip = { |
| .ack = ns9xxx_ack_irq, |
| .mask = ns9xxx_mask_irq, |
| .mask_ack = ns9xxx_maskack_irq, |
| .unmask = ns9xxx_unmask_irq, |
| }; |
| |
| #if 0 |
| #define handle_irq handle_level_irq |
| #else |
| void handle_prio_irq(unsigned int irq, struct irq_desc *desc) |
| { |
| unsigned int cpu = smp_processor_id(); |
| struct irqaction *action; |
| irqreturn_t action_ret; |
| |
| spin_lock(&desc->lock); |
| |
| BUG_ON(desc->status & IRQ_INPROGRESS); |
| |
| desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); |
| kstat_cpu(cpu).irqs[irq]++; |
| |
| action = desc->action; |
| if (unlikely(!action || (desc->status & IRQ_DISABLED))) |
| goto out_mask; |
| |
| desc->status |= IRQ_INPROGRESS; |
| spin_unlock(&desc->lock); |
| |
| action_ret = handle_IRQ_event(irq, action); |
| |
| /* XXX: There is no direct way to access noirqdebug, so check |
| * unconditionally for spurious irqs... |
| * Maybe this function should go to kernel/irq/chip.c? */ |
| note_interrupt(irq, desc, action_ret); |
| |
| spin_lock(&desc->lock); |
| desc->status &= ~IRQ_INPROGRESS; |
| |
| if (desc->status & IRQ_DISABLED) |
| out_mask: |
| desc->chip->mask(irq); |
| |
| /* ack unconditionally to unmask lower prio irqs */ |
| desc->chip->ack(irq); |
| |
| spin_unlock(&desc->lock); |
| } |
| #define handle_irq handle_prio_irq |
| #endif |
| |
| void __init ns9xxx_init_irq(void) |
| { |
| int i; |
| |
| /* disable all IRQs */ |
| for (i = 0; i < 8; ++i) |
| __raw_writel((4 * i) << 24 | (4 * i + 1) << 16 | |
| (4 * i + 2) << 8 | (4 * i + 3), SYS_IC(i)); |
| |
| /* simple interrupt prio table: |
| * prio(x) < prio(y) <=> x < y |
| */ |
| for (i = 0; i < 32; ++i) |
| __raw_writel(i, SYS_IVA(i)); |
| |
| for (i = 0; i <= 31; ++i) { |
| set_irq_chip(i, &ns9xxx_chip); |
| set_irq_handler(i, handle_irq); |
| set_irq_flags(i, IRQF_VALID); |
| } |
| } |