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 | |
28 | static void amiga_irq_enable(struct irq_data *data) |
29 | { |
30 | amiga_custom.intena = IF_SETCLR | (1 << (data->irq - IRQ_USER)); |
31 | } |
32 | |
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 | |
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: 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: 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: IRQ_AMIGA_SOFT); |
69 | } |
70 | } |
71 | |
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: 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 | |
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 | |
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 | |
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 | |