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
amiga_irq_enable(struct irq_data * data)28 static void amiga_irq_enable(struct irq_data *data)
29 {
30 amiga_custom.intena = IF_SETCLR | (1 << (data->irq - IRQ_USER));
31 }
32
amiga_irq_disable(struct irq_data * data)33 static void amiga_irq_disable(struct irq_data *data)
34 {
35 amiga_custom.intena = 1 << (data->irq - IRQ_USER);
36 }
37
38 static 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
ami_int1(struct irq_desc * desc)49 static 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
ami_int3(struct irq_desc * desc)72 static 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
ami_int4(struct irq_desc * desc)95 static 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
ami_int5(struct irq_desc * desc)124 static 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
amiga_init_IRQ(void)153 void __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