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[linux-2.6/next.git] / arch / mips / jazz / irq.c
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1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
6 * Copyright (C) 1992 Linus Torvalds
7 * Copyright (C) 1994 - 2001, 2003, 07 Ralf Baechle
8 */
9 #include <linux/clockchips.h>
10 #include <linux/init.h>
11 #include <linux/interrupt.h>
12 #include <linux/kernel.h>
13 #include <linux/smp.h>
14 #include <linux/spinlock.h>
15 #include <linux/irq.h>
17 #include <asm/irq_cpu.h>
18 #include <asm/i8253.h>
19 #include <asm/i8259.h>
20 #include <asm/io.h>
21 #include <asm/jazz.h>
22 #include <asm/pgtable.h>
24 static DEFINE_RAW_SPINLOCK(r4030_lock);
26 static void enable_r4030_irq(struct irq_data *d)
28 unsigned int mask = 1 << (d->irq - JAZZ_IRQ_START);
29 unsigned long flags;
31 raw_spin_lock_irqsave(&r4030_lock, flags);
32 mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
33 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
34 raw_spin_unlock_irqrestore(&r4030_lock, flags);
37 void disable_r4030_irq(struct irq_data *d)
39 unsigned int mask = ~(1 << (d->irq - JAZZ_IRQ_START));
40 unsigned long flags;
42 raw_spin_lock_irqsave(&r4030_lock, flags);
43 mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
44 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
45 raw_spin_unlock_irqrestore(&r4030_lock, flags);
48 static struct irq_chip r4030_irq_type = {
49 .name = "R4030",
50 .irq_mask = disable_r4030_irq,
51 .irq_unmask = enable_r4030_irq,
54 void __init init_r4030_ints(void)
56 int i;
58 for (i = JAZZ_IRQ_START; i <= JAZZ_IRQ_END; i++)
59 irq_set_chip_and_handler(i, &r4030_irq_type, handle_level_irq);
61 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
62 r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */
63 r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */
67 * On systems with i8259-style interrupt controllers we assume for
68 * driver compatibility reasons interrupts 0 - 15 to be the i8259
69 * interrupts even if the hardware uses a different interrupt numbering.
71 void __init arch_init_irq(void)
74 * this is a hack to get back the still needed wired mapping
75 * killed by init_mm()
78 /* Map 0xe0000000 -> 0x0:800005C0, 0xe0010000 -> 0x1:30000580 */
79 add_wired_entry(0x02000017, 0x03c00017, 0xe0000000, PM_64K);
80 /* Map 0xe2000000 -> 0x0:900005C0, 0xe3010000 -> 0x0:910005C0 */
81 add_wired_entry(0x02400017, 0x02440017, 0xe2000000, PM_16M);
82 /* Map 0xe4000000 -> 0x0:600005C0, 0xe4100000 -> 400005C0 */
83 add_wired_entry(0x01800017, 0x01000017, 0xe4000000, PM_4M);
85 init_i8259_irqs(); /* Integrated i8259 */
86 mips_cpu_irq_init();
87 init_r4030_ints();
89 change_c0_status(ST0_IM, IE_IRQ2 | IE_IRQ1);
92 asmlinkage void plat_irq_dispatch(void)
94 unsigned int pending = read_c0_cause() & read_c0_status();
95 unsigned int irq;
97 if (pending & IE_IRQ4) {
98 r4030_read_reg32(JAZZ_TIMER_REGISTER);
99 do_IRQ(JAZZ_TIMER_IRQ);
100 } else if (pending & IE_IRQ2) {
101 irq = *(volatile u8 *)JAZZ_EISA_IRQ_ACK;
102 do_IRQ(irq);
103 } else if (pending & IE_IRQ1) {
104 irq = *(volatile u8 *)JAZZ_IO_IRQ_SOURCE >> 2;
105 if (likely(irq > 0))
106 do_IRQ(irq + JAZZ_IRQ_START - 1);
107 else
108 panic("Unimplemented loc_no_irq handler");
112 static void r4030_set_mode(enum clock_event_mode mode,
113 struct clock_event_device *evt)
115 /* Nothing to do ... */
118 struct clock_event_device r4030_clockevent = {
119 .name = "r4030",
120 .features = CLOCK_EVT_FEAT_PERIODIC,
121 .rating = 300,
122 .irq = JAZZ_TIMER_IRQ,
123 .set_mode = r4030_set_mode,
126 static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id)
128 struct clock_event_device *cd = dev_id;
130 cd->event_handler(cd);
131 return IRQ_HANDLED;
134 static struct irqaction r4030_timer_irqaction = {
135 .handler = r4030_timer_interrupt,
136 .flags = IRQF_DISABLED | IRQF_TIMER,
137 .name = "R4030 timer",
140 void __init plat_time_init(void)
142 struct clock_event_device *cd = &r4030_clockevent;
143 struct irqaction *action = &r4030_timer_irqaction;
144 unsigned int cpu = smp_processor_id();
146 BUG_ON(HZ != 100);
148 cd->cpumask = cpumask_of(cpu);
149 clockevents_register_device(cd);
150 action->dev_id = cd;
151 setup_irq(JAZZ_TIMER_IRQ, action);
154 * Set clock to 100Hz.
156 * The R4030 timer receives an input clock of 1kHz which is divieded by
157 * a programmable 4-bit divider. This makes it fairly inflexible.
159 r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9);
160 setup_pit_timer();