pci_kn20aa.c revision 1.3 
1/*	$NetBSD: pci_kn20aa.c,v 1.2 1995/12/24 02:29:45 mycroft Exp $	*/
2
3/*
4 * Copyright (c) 1995 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22 *  School of Computer Science
23 *  Carnegie Mellon University
24 *  Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30#include <sys/types.h>
31#include <sys/param.h>
32#include <sys/time.h>
33#include <sys/systm.h>
34#include <sys/errno.h>
35#include <sys/malloc.h>
36#include <sys/device.h>
37#include <sys/syslog.h>
38
39#include <vm/vm.h>
40
41#include <dev/pci/pcireg.h>
42#include <dev/pci/pcivar.h>
43
44#include <alpha/pci/ciareg.h>
45#include <alpha/pci/ciavar.h>
46
47#include <alpha/pci/pci_kn20aa.h>
48
49#ifndef EVCNT_COUNTERS
50#include <machine/intrcnt.h>
51#endif
52
53#include "sio.h"
54#if NSIO
55#include <alpha/pci/siovar.h>
56#endif
57
58void	*kn20aa_pci_map_int __P((void *, pci_conftag_t, pci_intr_pin_t,
59	    pci_intr_line_t, int, int (*func)(void *), void *, char *));
60void	kn20aa_pci_unmap_int __P((void *, void *));
61
62__const struct pci_intr_fns kn20aa_pci_intr_fns = {
63	kn20aa_pci_map_int,
64	kn20aa_pci_unmap_int,
65};
66
67#define	KN20AA_PCEB_IRQ	31
68#define	KN20AA_MAX_IRQ	32
69#define	PCI_STRAY_MAX	5
70
71struct kn20aa_intrhand {
72	TAILQ_ENTRY(kn20aa_intrhand) ih_q;
73        int     (*ih_fun)();
74        void    *ih_arg;
75        u_long  ih_count;
76        int     ih_level;
77};
78TAILQ_HEAD(kn20aa_intrchain, kn20aa_intrhand);
79
80struct kn20aa_intrchain kn20aa_pci_intrs[KN20AA_MAX_IRQ];
81int	kn20aa_pci_strayintrcnt[KN20AA_MAX_IRQ];
82#ifdef EVCNT_COUNTERS
83struct evcnt kn20aa_intr_evcnt;
84#endif
85
86void	kn20aa_pci_strayintr __P((int irq));
87void	kn20aa_iointr __P((void *framep, int vec));
88void	kn20aa_enable_intr __P((int irq));
89struct kn20aa_intrhand *kn20aa_attach_intr __P((struct kn20aa_intrchain *,
90			    int, int (*) (void *), void *));
91
92void
93pci_kn20aa_pickintr(pcf, pcfa, ppf, ppfa, pifp, pifap)
94	__const struct pci_conf_fns *pcf;
95	__const struct pci_pio_fns *ppf;
96	void *pcfa, *ppfa;
97	__const struct pci_intr_fns **pifp;
98	void **pifap;
99{
100	int i;
101	struct kn20aa_intrhand *nintrhand;
102
103
104	for (i = 0; i < KN20AA_MAX_IRQ; i++)
105		TAILQ_INIT(&kn20aa_pci_intrs[i]);
106
107	*pifp = &kn20aa_pci_intr_fns;
108	*pifap = NULL;					/* XXX ? */
109
110#if NSIO
111	sio_intr_setup(ppf, ppfa);
112#endif
113
114	set_iointr(kn20aa_iointr);
115
116#if NSIO
117	kn20aa_enable_intr(KN20AA_PCEB_IRQ);
118#if 0 /* XXX init PCEB interrupt handler? */
119	kn20aa_attach_intr(&kn20aa_pci_intrs[KN20AA_PCEB_IRQ], ???, ???, ???);
120#endif
121#endif
122}
123
124void *
125kn20aa_pci_map_int(ccv, tag, pin, line, level, func, arg, what)
126	void *ccv;
127        pci_conftag_t tag;
128	pci_intr_pin_t pin;
129	pci_intr_line_t line;
130        int level;
131        int (*func) __P((void *));
132        void *arg;
133	char *what;
134{
135	int device;
136	int kn20aa_slot, kn20aa_irq;
137	void *ih;
138
139        if (pin == 0) {
140                /* No IRQ used. */
141                return 0;
142        }
143        if (pin > 4) {
144                printf("pci_map_int: bad interrupt pin %d\n", pin);
145                return NULL;
146        }
147
148	/*
149	 * Slot->interrupt translation.  Appears to work, though it
150	 * may not hold up forever.
151	 *
152	 * The DEC engineers who did this hardware obviously engaged
153	 * in random drug testing.
154	 */
155	switch (device = PCI_TAG_DEVICE(tag)) {
156	case 11:
157	case 12:
158		kn20aa_slot = (device - 11) + 0;
159		break;
160
161	case 7:
162		kn20aa_slot = 2;
163		break;
164
165	case 8:
166		kn20aa_slot = 4;
167		break;
168
169	case 9:
170		kn20aa_slot = 3;
171		break;
172
173	default:
174		panic("pci_kn20aa_map_int: invalid device number %d\n",
175		    device);
176	}
177
178	kn20aa_irq = (kn20aa_slot * 4) + pin - 1;
179	if (kn20aa_irq > KN20AA_MAX_IRQ)
180		panic("pci_kn20aa_map_int: kn20aa_irq too large (%d)\n",
181		    kn20aa_irq);
182
183#if 0
184	printf("kn20aa_attach_intr: func 0x%lx, arg 0x%lx, level %d, irq %d\n",
185	    func, arg, level, kn20aa_irq);
186#endif
187
188	ih = kn20aa_attach_intr(&kn20aa_pci_intrs[kn20aa_irq], level,
189	    func, arg);
190	kn20aa_enable_intr(kn20aa_irq);
191	return (ih);
192}
193
194void
195kn20aa_pci_unmap_int(pifa, cookie)
196	void *pifa;
197	void *cookie;
198{
199
200	panic("kn20aa_pci_unmap_int not implemented");	/* XXX */
201}
202
203/*
204 * caught a stray interrupt; notify if not too many seen already.
205 */
206void
207kn20aa_pci_strayintr(irq)
208	int irq;
209{
210
211	if (++kn20aa_pci_strayintrcnt[irq] <= PCI_STRAY_MAX)
212		log(LOG_ERR, "stray PCI interrupt %d%s\n", irq,
213		    kn20aa_pci_strayintrcnt[irq] >= PCI_STRAY_MAX ?
214		    "; stopped logging" : "");
215}
216
217void
218kn20aa_iointr(framep, vec)
219	void *framep;
220	int vec;
221{
222	struct kn20aa_intrhand *ih;
223	int irq, handled;
224
225	if (vec >= 0x900) {
226		if (vec >= 0x900 + (KN20AA_MAX_IRQ << 4))
227			panic("kn20aa_iointr: vec 0x%x out of range\n", vec);
228		irq = (vec - 0x900) >> 4;
229
230#ifdef EVCNT_COUNTERS
231		kn20aa_intr_evcnt.ev_count++;
232#else
233		if (KN20AA_MAX_IRQ != INTRCNT_KN20AA_IRQ_LEN)
234			panic("kn20aa interrupt counter sizes inconsistent");
235		intrcnt[INTRCNT_KN20AA_IRQ + irq]++;
236#endif
237
238		for (ih = kn20aa_pci_intrs[irq].tqh_first, handled = 0;
239		    ih != NULL; ih = ih->ih_q.tqe_next) {
240			int rv;
241
242			rv = (*ih->ih_fun)(ih->ih_arg);
243
244			ih->ih_count++;
245			handled = handled || (rv != 0);
246		}
247		if (!handled)
248			kn20aa_pci_strayintr(irq);
249		return;
250	}
251	if (vec >= 0x800) {
252#if NSIO
253		sio_iointr(framep, vec);
254#endif
255		return;
256	}
257	panic("kn20aa_iointr: weird vec 0x%x\n", vec);
258}
259
260void
261kn20aa_enable_intr(irq)
262	int irq;
263{
264
265	/*
266	 * From disassembling the OSF/1 source code:
267	 * the following appears to enable a given interrupt request.
268	 * "blech."  I'd give valuable body parts for better docs or
269	 * for a good decompiler.
270	 */
271	wbflush();
272	REGVAL(0x8780000000L + 0x40L) |= (1 << irq);	/* XXX */
273	wbflush();
274}
275
276struct kn20aa_intrhand *
277kn20aa_attach_intr(chain, level, func, arg)
278	struct kn20aa_intrchain *chain;
279	int level;
280	int (*func) __P((void *));
281	void *arg;
282{
283	struct kn20aa_intrhand *nintrhand;
284
285	nintrhand = (struct kn20aa_intrhand *)
286	    malloc(sizeof *nintrhand, M_DEVBUF, M_WAITOK);
287
288        nintrhand->ih_fun = func;
289        nintrhand->ih_arg = arg;
290        nintrhand->ih_count = 0;
291        nintrhand->ih_level = level;
292	TAILQ_INSERT_TAIL(chain, nintrhand, ih_q);
293
294	return (nintrhand);
295}
296