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
6 * Copyright (C) 1992 Linus Torvalds
7 * Copyright (C) 1994 - 2001, 2003 Ralf Baechle
9 #include <linux/init.h>
10 #include <linux/interrupt.h>
11 #include <linux/kernel.h>
12 #include <linux/spinlock.h>
14 #include <asm/i8259.h>
18 static DEFINE_SPINLOCK(r4030_lock);
20 static void enable_r4030_irq(unsigned int irq)
22 unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ);
25 spin_lock_irqsave(&r4030_lock, flags);
26 mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
27 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
28 spin_unlock_irqrestore(&r4030_lock, flags);
31 void disable_r4030_irq(unsigned int irq)
33 unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ));
36 spin_lock_irqsave(&r4030_lock, flags);
37 mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
38 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
39 spin_unlock_irqrestore(&r4030_lock, flags);
42 static struct irq_chip r4030_irq_type = {
44 .ack = disable_r4030_irq,
45 .mask = disable_r4030_irq,
46 .mask_ack = disable_r4030_irq,
47 .unmask = enable_r4030_irq,
50 void __init init_r4030_ints(void)
54 for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++)
55 set_irq_chip_and_handler(i, &r4030_irq_type, handle_level_irq);
57 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
58 r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */
59 r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */
63 * On systems with i8259-style interrupt controllers we assume for
64 * driver compatibility reasons interrupts 0 - 15 to be the i8259
65 * interrupts even if the hardware uses a different interrupt numbering.
67 void __init arch_init_irq(void)
69 init_i8259_irqs(); /* Integrated i8259 */
72 change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1);
75 static void loc_call(unsigned int irq, unsigned int mask)
77 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
78 r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) & mask);
80 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE,
81 r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) | mask);
84 static void ll_local_dev(void)
86 switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE)) {
88 panic("Unimplemented loc_no_irq handler");
91 loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_PARALLEL);
94 loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_FLOPPY);
97 panic("Unimplemented loc_sound handler");
100 panic("Unimplemented loc_video handler");
103 loc_call(JAZZ_ETHERNET_IRQ, JAZZ_IE_ETHERNET);
106 loc_call(JAZZ_SCSI_IRQ, JAZZ_IE_SCSI);
109 loc_call(JAZZ_KEYBOARD_IRQ, JAZZ_IE_KEYBOARD);
112 loc_call(JAZZ_MOUSE_IRQ, JAZZ_IE_MOUSE);
115 loc_call(JAZZ_SERIAL1_IRQ, JAZZ_IE_SERIAL1);
118 loc_call(JAZZ_SERIAL2_IRQ, JAZZ_IE_SERIAL2);
123 asmlinkage void plat_irq_dispatch(void)
125 unsigned int pending = read_c0_cause() & read_c0_status();
127 if (pending & IE_IRQ5)
129 else if (pending & IE_IRQ4) {
130 r4030_read_reg32(JAZZ_TIMER_REGISTER);
131 do_IRQ(JAZZ_TIMER_IRQ);
132 } else if (pending & IE_IRQ3)
133 panic("Unimplemented ISA NMI handler");
134 else if (pending & IE_IRQ2)
135 do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK));
136 else if (pending & IE_IRQ1) {
138 } else if (unlikely(pending & IE_IRQ0))
139 panic("Unimplemented local_dma handler");
140 else if (pending & IE_SW1) {
141 clear_c0_cause(IE_SW1);
142 panic("Unimplemented sw1 handler");
143 } else if (pending & IE_SW0) {
144 clear_c0_cause(IE_SW0);
145 panic("Unimplemented sw0 handler");