]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/mips/jazz/irq.c
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 void end_r4030_irq(unsigned int irq
)
44 if (!(irq_desc
[irq
].status
& (IRQ_DISABLED
|IRQ_INPROGRESS
)))
45 enable_r4030_irq(irq
);
48 static struct irq_chip r4030_irq_type
= {
50 .ack
= disable_r4030_irq
,
51 .mask
= disable_r4030_irq
,
52 .mask_ack
= disable_r4030_irq
,
53 .unmask
= enable_r4030_irq
,
57 void __init
init_r4030_ints(void)
61 for (i
= JAZZ_PARALLEL_IRQ
; i
<= JAZZ_TIMER_IRQ
; i
++)
62 set_irq_chip_and_handler(i
, &r4030_irq_type
, handle_level_irq
);
64 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE
, 0);
65 r4030_read_reg16(JAZZ_IO_IRQ_SOURCE
); /* clear pending IRQs */
66 r4030_read_reg32(JAZZ_R4030_INVAL_ADDR
); /* clear error bits */
70 * On systems with i8259-style interrupt controllers we assume for
71 * driver compatibility reasons interrupts 0 - 15 to be the i8259
72 * interrupts even if the hardware uses a different interrupt numbering.
74 void __init
arch_init_irq(void)
76 init_i8259_irqs(); /* Integrated i8259 */
79 change_c0_status(ST0_IM
, IE_IRQ4
| IE_IRQ3
| IE_IRQ2
| IE_IRQ1
);
82 static void loc_call(unsigned int irq
, unsigned int mask
)
84 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE
,
85 r4030_read_reg16(JAZZ_IO_IRQ_ENABLE
) & mask
);
87 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE
,
88 r4030_read_reg16(JAZZ_IO_IRQ_ENABLE
) | mask
);
91 static void ll_local_dev(void)
93 switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE
)) {
95 panic("Unimplemented loc_no_irq handler");
98 loc_call(JAZZ_PARALLEL_IRQ
, JAZZ_IE_PARALLEL
);
101 loc_call(JAZZ_PARALLEL_IRQ
, JAZZ_IE_FLOPPY
);
104 panic("Unimplemented loc_sound handler");
107 panic("Unimplemented loc_video handler");
110 loc_call(JAZZ_ETHERNET_IRQ
, JAZZ_IE_ETHERNET
);
113 loc_call(JAZZ_SCSI_IRQ
, JAZZ_IE_SCSI
);
116 loc_call(JAZZ_KEYBOARD_IRQ
, JAZZ_IE_KEYBOARD
);
119 loc_call(JAZZ_MOUSE_IRQ
, JAZZ_IE_MOUSE
);
122 loc_call(JAZZ_SERIAL1_IRQ
, JAZZ_IE_SERIAL1
);
125 loc_call(JAZZ_SERIAL2_IRQ
, JAZZ_IE_SERIAL2
);
130 asmlinkage
void plat_irq_dispatch(void)
132 unsigned int pending
= read_c0_cause() & read_c0_status() & ST0_IM
;
134 if (pending
& IE_IRQ5
)
136 else if (pending
& IE_IRQ4
) {
137 r4030_read_reg32(JAZZ_TIMER_REGISTER
);
138 do_IRQ(JAZZ_TIMER_IRQ
);
139 } else if (pending
& IE_IRQ3
)
140 panic("Unimplemented ISA NMI handler");
141 else if (pending
& IE_IRQ2
)
142 do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK
));
143 else if (pending
& IE_IRQ1
) {
145 } else if (unlikely(pending
& IE_IRQ0
))
146 panic("Unimplemented local_dma handler");
147 else if (pending
& IE_SW1
) {
148 clear_c0_cause(IE_SW1
);
149 panic("Unimplemented sw1 handler");
150 } else if (pending
& IE_SW0
) {
151 clear_c0_cause(IE_SW0
);
152 panic("Unimplemented sw0 handler");