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-rw-r--r--arch/ppc/amiga/amiints.c322
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diff --git a/arch/ppc/amiga/amiints.c b/arch/ppc/amiga/amiints.c
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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 * 11/07/96: rewritten interrupt handling, irq lists are exists now only for
9 * this sources where it makes sense (VERTB/PORTS/EXTER) and you must
10 * be careful that dev_id for this sources is unique since this the
11 * only possibility to distinguish between different handlers for
12 * free_irq. irq lists also have different irq flags:
13 * - IRQ_FLG_FAST: handler is inserted at top of list (after other
14 * fast handlers)
15 * - IRQ_FLG_SLOW: handler is inserted at bottom of list and before
16 * they're executed irq level is set to the previous
17 * one, but handlers don't need to be reentrant, if
18 * reentrance occurred, slow handlers will be just
19 * called again.
20 * The whole interrupt handling for CIAs is moved to cia.c
21 * /Roman Zippel
22 *
23 * 07/08/99: rewamp of the interrupt handling - we now have two types of
24 * interrupts, normal and fast handlers, fast handlers being
25 * marked with SA_INTERRUPT and runs with all other interrupts
26 * disabled. Normal interrupts disable their own source but
27 * run with all other interrupt sources enabled.
28 * PORTS and EXTER interrupts are always shared even if the
29 * drivers do not explicitly mark this when calling
30 * request_irq which they really should do.
31 * This is similar to the way interrupts are handled on all
32 * other architectures and makes a ton of sense besides
33 * having the advantage of making it easier to share
34 * drivers.
35 * /Jes
36 */
37
38#include <linux/types.h>
39#include <linux/kernel.h>
40#include <linux/sched.h>
41#include <linux/interrupt.h>
42#include <linux/irq.h>
43#include <linux/kernel_stat.h>
44#include <linux/init.h>
45
46#include <asm/system.h>
47#include <asm/irq.h>
48#include <asm/traps.h>
49#include <asm/amigahw.h>
50#include <asm/amigaints.h>
51#include <asm/amipcmcia.h>
52
53#ifdef CONFIG_APUS
54#include <asm/amigappc.h>
55#endif
56
57extern void cia_init_IRQ(struct ciabase *base);
58
59unsigned short ami_intena_vals[AMI_STD_IRQS] = {
60 IF_VERTB, IF_COPER, IF_AUD0, IF_AUD1, IF_AUD2, IF_AUD3, IF_BLIT,
61 IF_DSKSYN, IF_DSKBLK, IF_RBF, IF_TBE, IF_SOFT, IF_PORTS, IF_EXTER
62};
63static const unsigned char ami_servers[AMI_STD_IRQS] = {
64 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1
65};
66
67static short ami_ablecount[AMI_IRQS];
68
69static void ami_badint(int irq, void *dev_id, struct pt_regs *fp)
70{
71/* num_spurious += 1;*/
72}
73
74/*
75 * void amiga_init_IRQ(void)
76 *
77 * Parameters: None
78 *
79 * Returns: Nothing
80 *
81 * This function should be called during kernel startup to initialize
82 * the amiga IRQ handling routines.
83 */
84
85__init
86void amiga_init_IRQ(void)
87{
88 int i;
89
90 for (i = 0; i < AMI_IRQS; i++)
91 ami_ablecount[i] = 0;
92
93 /* turn off PCMCIA interrupts */
94 if (AMIGAHW_PRESENT(PCMCIA))
95 gayle.inten = GAYLE_IRQ_IDE;
96
97 /* turn off all interrupts... */
98 amiga_custom.intena = 0x7fff;
99 amiga_custom.intreq = 0x7fff;
100
101#ifdef CONFIG_APUS
102 /* Clear any inter-CPU interrupt requests. Circumvents bug in
103 Blizzard IPL emulation HW (or so it appears). */
104 APUS_WRITE(APUS_INT_LVL, INTLVL_SETRESET | INTLVL_MASK);
105
106 /* Init IPL emulation. */
107 APUS_WRITE(APUS_REG_INT, REGINT_INTMASTER | REGINT_ENABLEIPL);
108 APUS_WRITE(APUS_IPL_EMU, IPLEMU_DISABLEINT);
109 APUS_WRITE(APUS_IPL_EMU, IPLEMU_SETRESET | IPLEMU_IPLMASK);
110#endif
111 /* ... and enable the master interrupt bit */
112 amiga_custom.intena = IF_SETCLR | IF_INTEN;
113
114 cia_init_IRQ(&ciaa_base);
115 cia_init_IRQ(&ciab_base);
116}
117
118/*
119 * Enable/disable a particular machine specific interrupt source.
120 * Note that this may affect other interrupts in case of a shared interrupt.
121 * This function should only be called for a _very_ short time to change some
122 * internal data, that may not be changed by the interrupt at the same time.
123 * ami_(enable|disable)_irq calls may also be nested.
124 */
125
126void amiga_enable_irq(unsigned int irq)
127{
128 if (irq >= AMI_IRQS) {
129 printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
130 return;
131 }
132
133 ami_ablecount[irq]--;
134 if (ami_ablecount[irq]<0)
135 ami_ablecount[irq]=0;
136 else if (ami_ablecount[irq])
137 return;
138
139 /* No action for auto-vector interrupts */
140 if (irq >= IRQ_AMIGA_AUTO){
141 printk("%s: Trying to enable auto-vector IRQ %i\n",
142 __FUNCTION__, irq - IRQ_AMIGA_AUTO);
143 return;
144 }
145
146 if (irq >= IRQ_AMIGA_CIAA) {
147 cia_set_irq(irq, 0);
148 cia_able_irq(irq, 1);
149 return;
150 }
151
152 /* enable the interrupt */
153 amiga_custom.intena = IF_SETCLR | ami_intena_vals[irq];
154}
155
156void amiga_disable_irq(unsigned int irq)
157{
158 if (irq >= AMI_IRQS) {
159 printk("%s: Unknown IRQ %d\n", __FUNCTION__, irq);
160 return;
161 }
162
163 if (ami_ablecount[irq]++)
164 return;
165
166 /* No action for auto-vector interrupts */
167 if (irq >= IRQ_AMIGA_AUTO) {
168 printk("%s: Trying to disable auto-vector IRQ %i\n",
169 __FUNCTION__, irq - IRQ_AMIGA_AUTO);
170 return;
171 }
172
173 if (irq >= IRQ_AMIGA_CIAA) {
174 cia_able_irq(irq, 0);
175 return;
176 }
177
178 /* disable the interrupt */
179 amiga_custom.intena = ami_intena_vals[irq];
180}
181
182inline void amiga_do_irq(int irq, struct pt_regs *fp)
183{
184 irq_desc_t *desc = irq_desc + irq;
185 struct irqaction *action = desc->action;
186
187 kstat_cpu(0).irqs[irq]++;
188 action->handler(irq, action->dev_id, fp);
189}
190
191void amiga_do_irq_list(int irq, struct pt_regs *fp)
192{
193 irq_desc_t *desc = irq_desc + irq;
194 struct irqaction *action;
195
196 kstat_cpu(0).irqs[irq]++;
197
198 amiga_custom.intreq = ami_intena_vals[irq];
199
200 for (action = desc->action; action; action = action->next)
201 action->handler(irq, action->dev_id, fp);
202}
203
204/*
205 * The builtin Amiga hardware interrupt handlers.
206 */
207
208static void ami_int1(int irq, void *dev_id, struct pt_regs *fp)
209{
210 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
211
212 /* if serial transmit buffer empty, interrupt */
213 if (ints & IF_TBE) {
214 amiga_custom.intreq = IF_TBE;
215 amiga_do_irq(IRQ_AMIGA_TBE, fp);
216 }
217
218 /* if floppy disk transfer complete, interrupt */
219 if (ints & IF_DSKBLK) {
220 amiga_custom.intreq = IF_DSKBLK;
221 amiga_do_irq(IRQ_AMIGA_DSKBLK, fp);
222 }
223
224 /* if software interrupt set, interrupt */
225 if (ints & IF_SOFT) {
226 amiga_custom.intreq = IF_SOFT;
227 amiga_do_irq(IRQ_AMIGA_SOFT, fp);
228 }
229}
230
231static void ami_int3(int irq, void *dev_id, struct pt_regs *fp)
232{
233 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
234
235 /* if a blitter interrupt */
236 if (ints & IF_BLIT) {
237 amiga_custom.intreq = IF_BLIT;
238 amiga_do_irq(IRQ_AMIGA_BLIT, fp);
239 }
240
241 /* if a copper interrupt */
242 if (ints & IF_COPER) {
243 amiga_custom.intreq = IF_COPER;
244 amiga_do_irq(IRQ_AMIGA_COPPER, fp);
245 }
246
247 /* if a vertical blank interrupt */
248 if (ints & IF_VERTB)
249 amiga_do_irq_list(IRQ_AMIGA_VERTB, fp);
250}
251
252static void ami_int4(int irq, void *dev_id, struct pt_regs *fp)
253{
254 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
255
256 /* if audio 0 interrupt */
257 if (ints & IF_AUD0) {
258 amiga_custom.intreq = IF_AUD0;
259 amiga_do_irq(IRQ_AMIGA_AUD0, fp);
260 }
261
262 /* if audio 1 interrupt */
263 if (ints & IF_AUD1) {
264 amiga_custom.intreq = IF_AUD1;
265 amiga_do_irq(IRQ_AMIGA_AUD1, fp);
266 }
267
268 /* if audio 2 interrupt */
269 if (ints & IF_AUD2) {
270 amiga_custom.intreq = IF_AUD2;
271 amiga_do_irq(IRQ_AMIGA_AUD2, fp);
272 }
273
274 /* if audio 3 interrupt */
275 if (ints & IF_AUD3) {
276 amiga_custom.intreq = IF_AUD3;
277 amiga_do_irq(IRQ_AMIGA_AUD3, fp);
278 }
279}
280
281static void ami_int5(int irq, void *dev_id, struct pt_regs *fp)
282{
283 unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
284
285 /* if serial receive buffer full interrupt */
286 if (ints & IF_RBF) {
287 /* acknowledge of IF_RBF must be done by the serial interrupt */
288 amiga_do_irq(IRQ_AMIGA_RBF, fp);
289 }
290
291 /* if a disk sync interrupt */
292 if (ints & IF_DSKSYN) {
293 amiga_custom.intreq = IF_DSKSYN;
294 amiga_do_irq(IRQ_AMIGA_DSKSYN, fp);
295 }
296}
297
298static void ami_int7(int irq, void *dev_id, struct pt_regs *fp)
299{
300 panic ("level 7 interrupt received\n");
301}
302
303#ifdef CONFIG_APUS
304/* The PPC irq handling links all handlers requested on the same vector
305 and executes them in a loop. Having ami_badint at the end of the chain
306 is a bad idea. */
307struct irqaction amiga_sys_irqaction[AUTO_IRQS] = {
308 { .handler = ami_badint, .name = "spurious int" },
309 { .handler = ami_int1, .name = "int1 handler" },
310 { 0, /* CIAA */ },
311 { .handler = ami_int3, .name = "int3 handler" },
312 { .handler = ami_int4, .name = "int4 handler" },
313 { .handler = ami_int5, .name = "int5 handler" },
314 { 0, /* CIAB */ },
315 { .handler = ami_int7, .name = "int7 handler" },
316};
317#else
318void (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
319 ami_badint, ami_int1, ami_badint, ami_int3,
320 ami_int4, ami_int5, ami_badint, ami_int7
321};
322#endif
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