aboutsummaryrefslogtreecommitdiff
path: root/arch/m68k/amiga/amiints.c
blob: a8da471265844df9f7b3c03918d0b3162da05853 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
/*
 * Amiga Linux interrupt handling code
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#ifdef CONFIG_GENERIC_HARDIRQS
#include <linux/irq.h>
#endif

#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/amipcmcia.h>


/*
 * Enable/disable a particular machine specific interrupt source.
 * Note that this may affect other interrupts in case of a shared interrupt.
 * This function should only be called for a _very_ short time to change some
 * internal data, that may not be changed by the interrupt at the same time.
 */

static void amiga_irq_enable(struct irq_data *data)
{
	amiga_custom.intena = IF_SETCLR | (1 << (data->irq - IRQ_USER));
}

static void amiga_irq_disable(struct irq_data *data)
{
	amiga_custom.intena = 1 << (data->irq - IRQ_USER);
}

static struct irq_chip amiga_irq_chip = {
	.name		= "amiga",
	.irq_enable	= amiga_irq_enable,
	.irq_disable	= amiga_irq_disable,
};


/*
 * The builtin Amiga hardware interrupt handlers.
 */

#ifdef CONFIG_GENERIC_HARDIRQS
static void ami_int1(unsigned int irq, struct irq_desc *desc)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if serial transmit buffer empty, interrupt */
	if (ints & IF_TBE) {
		amiga_custom.intreq = IF_TBE;
		generic_handle_irq(IRQ_AMIGA_TBE);
	}

	/* if floppy disk transfer complete, interrupt */
	if (ints & IF_DSKBLK) {
		amiga_custom.intreq = IF_DSKBLK;
		generic_handle_irq(IRQ_AMIGA_DSKBLK);
	}

	/* if software interrupt set, interrupt */
	if (ints & IF_SOFT) {
		amiga_custom.intreq = IF_SOFT;
		generic_handle_irq(IRQ_AMIGA_SOFT);
	}
}

static void ami_int3(unsigned int irq, struct irq_desc *desc)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if a blitter interrupt */
	if (ints & IF_BLIT) {
		amiga_custom.intreq = IF_BLIT;
		generic_handle_irq(IRQ_AMIGA_BLIT);
	}

	/* if a copper interrupt */
	if (ints & IF_COPER) {
		amiga_custom.intreq = IF_COPER;
		generic_handle_irq(IRQ_AMIGA_COPPER);
	}

	/* if a vertical blank interrupt */
	if (ints & IF_VERTB) {
		amiga_custom.intreq = IF_VERTB;
		generic_handle_irq(IRQ_AMIGA_VERTB);
	}
}

static void ami_int4(unsigned int irq, struct irq_desc *desc)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if audio 0 interrupt */
	if (ints & IF_AUD0) {
		amiga_custom.intreq = IF_AUD0;
		generic_handle_irq(IRQ_AMIGA_AUD0);
	}

	/* if audio 1 interrupt */
	if (ints & IF_AUD1) {
		amiga_custom.intreq = IF_AUD1;
		generic_handle_irq(IRQ_AMIGA_AUD1);
	}

	/* if audio 2 interrupt */
	if (ints & IF_AUD2) {
		amiga_custom.intreq = IF_AUD2;
		generic_handle_irq(IRQ_AMIGA_AUD2);
	}

	/* if audio 3 interrupt */
	if (ints & IF_AUD3) {
		amiga_custom.intreq = IF_AUD3;
		generic_handle_irq(IRQ_AMIGA_AUD3);
	}
}

static void ami_int5(unsigned int irq, struct irq_desc *desc)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if serial receive buffer full interrupt */
	if (ints & IF_RBF) {
		/* acknowledge of IF_RBF must be done by the serial interrupt */
		generic_handle_irq(IRQ_AMIGA_RBF);
	}

	/* if a disk sync interrupt */
	if (ints & IF_DSKSYN) {
		amiga_custom.intreq = IF_DSKSYN;
		generic_handle_irq(IRQ_AMIGA_DSKSYN);
	}
}
#else /* !CONFIG_GENERIC_HARDIRQS */
static irqreturn_t ami_int1(int irq, void *dev_id)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if serial transmit buffer empty, interrupt */
	if (ints & IF_TBE) {
		amiga_custom.intreq = IF_TBE;
		generic_handle_irq(IRQ_AMIGA_TBE);
	}

	/* if floppy disk transfer complete, interrupt */
	if (ints & IF_DSKBLK) {
		amiga_custom.intreq = IF_DSKBLK;
		generic_handle_irq(IRQ_AMIGA_DSKBLK);
	}

	/* if software interrupt set, interrupt */
	if (ints & IF_SOFT) {
		amiga_custom.intreq = IF_SOFT;
		generic_handle_irq(IRQ_AMIGA_SOFT);
	}
	return IRQ_HANDLED;
}

static irqreturn_t ami_int3(int irq, void *dev_id)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if a blitter interrupt */
	if (ints & IF_BLIT) {
		amiga_custom.intreq = IF_BLIT;
		generic_handle_irq(IRQ_AMIGA_BLIT);
	}

	/* if a copper interrupt */
	if (ints & IF_COPER) {
		amiga_custom.intreq = IF_COPER;
		generic_handle_irq(IRQ_AMIGA_COPPER);
	}

	/* if a vertical blank interrupt */
	if (ints & IF_VERTB) {
		amiga_custom.intreq = IF_VERTB;
		generic_handle_irq(IRQ_AMIGA_VERTB);
	}
	return IRQ_HANDLED;
}

static irqreturn_t ami_int4(int irq, void *dev_id)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if audio 0 interrupt */
	if (ints & IF_AUD0) {
		amiga_custom.intreq = IF_AUD0;
		generic_handle_irq(IRQ_AMIGA_AUD0);
	}

	/* if audio 1 interrupt */
	if (ints & IF_AUD1) {
		amiga_custom.intreq = IF_AUD1;
		generic_handle_irq(IRQ_AMIGA_AUD1);
	}

	/* if audio 2 interrupt */
	if (ints & IF_AUD2) {
		amiga_custom.intreq = IF_AUD2;
		generic_handle_irq(IRQ_AMIGA_AUD2);
	}

	/* if audio 3 interrupt */
	if (ints & IF_AUD3) {
		amiga_custom.intreq = IF_AUD3;
		generic_handle_irq(IRQ_AMIGA_AUD3);
	}
	return IRQ_HANDLED;
}

static irqreturn_t ami_int5(int irq, void *dev_id)
{
	unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;

	/* if serial receive buffer full interrupt */
	if (ints & IF_RBF) {
		/* acknowledge of IF_RBF must be done by the serial interrupt */
		generic_handle_irq(IRQ_AMIGA_RBF);
	}

	/* if a disk sync interrupt */
	if (ints & IF_DSKSYN) {
		amiga_custom.intreq = IF_DSKSYN;
		generic_handle_irq(IRQ_AMIGA_DSKSYN);
	}
	return IRQ_HANDLED;
}
#endif /* !CONFIG_GENERIC_HARDIRQS */


/*
 * void amiga_init_IRQ(void)
 *
 * Parameters:	None
 *
 * Returns:	Nothing
 *
 * This function should be called during kernel startup to initialize
 * the amiga IRQ handling routines.
 */

void __init amiga_init_IRQ(void)
{
#ifdef CONFIG_GENERIC_HARDIRQS
	m68k_setup_irq_controller(&amiga_irq_chip, handle_simple_irq, IRQ_USER,
				  AMI_STD_IRQS);

	irq_set_chained_handler(IRQ_AUTO_1, ami_int1);
	irq_set_chained_handler(IRQ_AUTO_3, ami_int3);
	irq_set_chained_handler(IRQ_AUTO_4, ami_int4);
	irq_set_chained_handler(IRQ_AUTO_5, ami_int5);
#else /* !CONFIG_GENERIC_HARDIRQS */
	if (request_irq(IRQ_AUTO_1, ami_int1, 0, "int1", NULL))
		pr_err("Couldn't register int%d\n", 1);
	if (request_irq(IRQ_AUTO_3, ami_int3, 0, "int3", NULL))
		pr_err("Couldn't register int%d\n", 3);
	if (request_irq(IRQ_AUTO_4, ami_int4, 0, "int4", NULL))
		pr_err("Couldn't register int%d\n", 4);
	if (request_irq(IRQ_AUTO_5, ami_int5, 0, "int5", NULL))
		pr_err("Couldn't register int%d\n", 5);

	m68k_setup_irq_controller(&amiga_irq_chip, handle_simple_irq, IRQ_USER,
				  AMI_STD_IRQS);
#endif /* !CONFIG_GENERIC_HARDIRQS */

	/* turn off PCMCIA interrupts */
	if (AMIGAHW_PRESENT(PCMCIA))
		gayle.inten = GAYLE_IRQ_IDE;

	/* turn off all interrupts and enable the master interrupt bit */
	amiga_custom.intena = 0x7fff;
	amiga_custom.intreq = 0x7fff;
	amiga_custom.intena = IF_SETCLR | IF_INTEN;

	cia_init_IRQ(&ciaa_base);
	cia_init_IRQ(&ciab_base);
}