2 * arch/arm/mach-ns9xxx/irq.c
4 * Copyright (C) 2006,2007 by Digi International Inc.
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
11 #include <linux/interrupt.h>
12 #include <linux/kernel_stat.h>
14 #include <asm/mach/irq.h>
15 #include <asm/mach-types.h>
16 #include <asm/arch-ns9xxx/regs-sys-common.h>
17 #include <asm/arch-ns9xxx/irqs.h>
18 #include <asm/arch-ns9xxx/board.h>
22 /* simple interrupt prio table: prio(x) < prio(y) <=> x < y */
23 #define irq2prio(i) (i)
24 #define prio2irq(p) (p)
26 static void ns9xxx_mask_irq(unsigned int irq)
28 /* XXX: better use cpp symbols */
29 int prio = irq2prio(irq);
30 u32 ic = __raw_readl(SYS_IC(prio / 4));
31 ic &= ~(1 << (7 + 8 * (3 - (prio & 3))));
32 __raw_writel(ic, SYS_IC(prio / 4));
35 static void ns9xxx_ack_irq(unsigned int irq)
37 __raw_writel(0, SYS_ISRADDR);
40 static void ns9xxx_maskack_irq(unsigned int irq)
46 static void ns9xxx_unmask_irq(unsigned int irq)
48 /* XXX: better use cpp symbols */
49 int prio = irq2prio(irq);
50 u32 ic = __raw_readl(SYS_IC(prio / 4));
51 ic |= 1 << (7 + 8 * (3 - (prio & 3)));
52 __raw_writel(ic, SYS_IC(prio / 4));
55 static struct irq_chip ns9xxx_chip = {
56 .ack = ns9xxx_ack_irq,
57 .mask = ns9xxx_mask_irq,
58 .mask_ack = ns9xxx_maskack_irq,
59 .unmask = ns9xxx_unmask_irq,
63 #define handle_irq handle_level_irq
65 void handle_prio_irq(unsigned int irq, struct irq_desc *desc)
67 unsigned int cpu = smp_processor_id();
68 struct irqaction *action;
69 irqreturn_t action_ret;
71 spin_lock(&desc->lock);
73 if (unlikely(desc->status & IRQ_INPROGRESS))
76 desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
77 kstat_cpu(cpu).irqs[irq]++;
79 action = desc->action;
80 if (unlikely(!action || (desc->status & IRQ_DISABLED)))
83 desc->status |= IRQ_INPROGRESS;
84 spin_unlock(&desc->lock);
86 action_ret = handle_IRQ_event(irq, action);
88 spin_lock(&desc->lock);
89 desc->status &= ~IRQ_INPROGRESS;
90 if (!(desc->status & IRQ_DISABLED) && desc->chip->ack)
94 spin_unlock(&desc->lock);
96 #define handle_irq handle_prio_irq
99 void __init ns9xxx_init_irq(void)
103 /* disable all IRQs */
104 for (i = 0; i < 8; ++i)
105 __raw_writel(prio2irq(4 * i) << 24 |
106 prio2irq(4 * i + 1) << 16 |
107 prio2irq(4 * i + 2) << 8 |
111 for (i = 0; i < 32; ++i)
112 __raw_writel(prio2irq(i), SYS_IVA(i));
114 for (i = 0; i <= 31; ++i) {
115 set_irq_chip(i, &ns9xxx_chip);
116 set_irq_handler(i, handle_irq);
117 set_irq_flags(i, IRQF_VALID);