1/*
2 * Amiga Linux interrupt handling code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License.  See the file COPYING in the main directory of this archive
6 * for more details.
7 */
8
9#include <linux/init.h>
10#include <linux/interrupt.h>
11#include <linux/errno.h>
12#include <linux/irq.h>
13
14#include <asm/irq.h>
15#include <asm/traps.h>
16#include <asm/amigahw.h>
17#include <asm/amigaints.h>
18#include <asm/amipcmcia.h>
19
20
21/*
22 * Enable/disable a particular machine specific interrupt source.
23 * Note that this may affect other interrupts in case of a shared interrupt.
24 * This function should only be called for a _very_ short time to change some
25 * internal data, that may not be changed by the interrupt at the same time.
26 */
27
28static void amiga_irq_enable(struct irq_data *data)
29{
30	amiga_custom.intena = IF_SETCLR | (1 << (data->irq - IRQ_USER));
31}
32
33static void amiga_irq_disable(struct irq_data *data)
34{
35	amiga_custom.intena = 1 << (data->irq - IRQ_USER);
36}
37
38static struct irq_chip amiga_irq_chip = {
39	.name		= "amiga",
40	.irq_enable	= amiga_irq_enable,
41	.irq_disable	= amiga_irq_disable,
42};
43
44
45/*
46 * The builtin Amiga hardware interrupt handlers.
47 */
48
49static void ami_int1(struct irq_desc *desc)
50{
51	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
52
53	/* if serial transmit buffer empty, interrupt */
54	if (ints & IF_TBE) {
55		amiga_custom.intreq = IF_TBE;
56		generic_handle_irq(IRQ_AMIGA_TBE);
57	}
58
59	/* if floppy disk transfer complete, interrupt */
60	if (ints & IF_DSKBLK) {
61		amiga_custom.intreq = IF_DSKBLK;
62		generic_handle_irq(IRQ_AMIGA_DSKBLK);
63	}
64
65	/* if software interrupt set, interrupt */
66	if (ints & IF_SOFT) {
67		amiga_custom.intreq = IF_SOFT;
68		generic_handle_irq(IRQ_AMIGA_SOFT);
69	}
70}
71
72static void ami_int3(struct irq_desc *desc)
73{
74	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
75
76	/* if a blitter interrupt */
77	if (ints & IF_BLIT) {
78		amiga_custom.intreq = IF_BLIT;
79		generic_handle_irq(IRQ_AMIGA_BLIT);
80	}
81
82	/* if a copper interrupt */
83	if (ints & IF_COPER) {
84		amiga_custom.intreq = IF_COPER;
85		generic_handle_irq(IRQ_AMIGA_COPPER);
86	}
87
88	/* if a vertical blank interrupt */
89	if (ints & IF_VERTB) {
90		amiga_custom.intreq = IF_VERTB;
91		generic_handle_irq(IRQ_AMIGA_VERTB);
92	}
93}
94
95static void ami_int4(struct irq_desc *desc)
96{
97	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
98
99	/* if audio 0 interrupt */
100	if (ints & IF_AUD0) {
101		amiga_custom.intreq = IF_AUD0;
102		generic_handle_irq(IRQ_AMIGA_AUD0);
103	}
104
105	/* if audio 1 interrupt */
106	if (ints & IF_AUD1) {
107		amiga_custom.intreq = IF_AUD1;
108		generic_handle_irq(IRQ_AMIGA_AUD1);
109	}
110
111	/* if audio 2 interrupt */
112	if (ints & IF_AUD2) {
113		amiga_custom.intreq = IF_AUD2;
114		generic_handle_irq(IRQ_AMIGA_AUD2);
115	}
116
117	/* if audio 3 interrupt */
118	if (ints & IF_AUD3) {
119		amiga_custom.intreq = IF_AUD3;
120		generic_handle_irq(IRQ_AMIGA_AUD3);
121	}
122}
123
124static void ami_int5(struct irq_desc *desc)
125{
126	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
127
128	/* if serial receive buffer full interrupt */
129	if (ints & IF_RBF) {
130		/* acknowledge of IF_RBF must be done by the serial interrupt */
131		generic_handle_irq(IRQ_AMIGA_RBF);
132	}
133
134	/* if a disk sync interrupt */
135	if (ints & IF_DSKSYN) {
136		amiga_custom.intreq = IF_DSKSYN;
137		generic_handle_irq(IRQ_AMIGA_DSKSYN);
138	}
139}
140
141
142/*
143 * void amiga_init_IRQ(void)
144 *
145 * Parameters:	None
146 *
147 * Returns:	Nothing
148 *
149 * This function should be called during kernel startup to initialize
150 * the amiga IRQ handling routines.
151 */
152
153void __init amiga_init_IRQ(void)
154{
155	m68k_setup_irq_controller(&amiga_irq_chip, handle_simple_irq, IRQ_USER,
156				  AMI_STD_IRQS);
157
158	irq_set_chained_handler(IRQ_AUTO_1, ami_int1);
159	irq_set_chained_handler(IRQ_AUTO_3, ami_int3);
160	irq_set_chained_handler(IRQ_AUTO_4, ami_int4);
161	irq_set_chained_handler(IRQ_AUTO_5, ami_int5);
162
163	/* turn off PCMCIA interrupts */
164	if (AMIGAHW_PRESENT(PCMCIA))
165		gayle.inten = GAYLE_IRQ_IDE;
166
167	/* turn off all interrupts and enable the master interrupt bit */
168	amiga_custom.intena = 0x7fff;
169	amiga_custom.intreq = 0x7fff;
170	amiga_custom.intena = IF_SETCLR | IF_INTEN;
171
172	cia_init_IRQ(&ciaa_base);
173	cia_init_IRQ(&ciab_base);
174}
175