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pci_kn20aa.c revision 1.2 
      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 (at) 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 
     58 void	*kn20aa_pci_map_int __P((void *, pci_conftag_t, pci_intr_pin_t,
     59 	    pci_intr_line_t, int, int (*func)(void *), void *));
     60 void	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 
     71 struct 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 };
     78 TAILQ_HEAD(kn20aa_intrchain, kn20aa_intrhand);
     79 
     80 struct kn20aa_intrchain kn20aa_pci_intrs[KN20AA_MAX_IRQ];
     81 int	kn20aa_pci_strayintrcnt[KN20AA_MAX_IRQ];
     82 #ifdef EVCNT_COUNTERS
     83 struct evcnt kn20aa_intr_evcnt;
     84 #endif
     85 
     86 void	kn20aa_pci_strayintr __P((int irq));
     87 void	kn20aa_iointr __P((void *framep, int vec));
     88 void	kn20aa_enable_intr __P((int irq));
     89 struct kn20aa_intrhand *kn20aa_attach_intr __P((struct kn20aa_intrchain *,
     90 			    int, int (*) (void *), void *));
     91 
     92 void
     93 pci_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 
    124 void *
    125 kn20aa_pci_map_int(ccv, tag, pin, line, level, func, arg)
    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 {
    134 	int device;
    135 	int kn20aa_slot, kn20aa_irq;
    136 	void *ih;
    137 
    138         if (pin == 0) {
    139                 /* No IRQ used. */
    140                 return 0;
    141         }
    142         if (pin > 4) {
    143                 printf("pci_map_int: bad interrupt pin %d\n", pin);
    144                 return NULL;
    145         }
    146 
    147 	/*
    148 	 * Slot->interrupt translation.  Appears to work, though it
    149 	 * may not hold up forever.
    150 	 *
    151 	 * The DEC engineers who did this hardware obviously engaged
    152 	 * in random drug testing.
    153 	 */
    154 	switch (device = PCI_TAG_DEVICE(tag)) {
    155 	case 11:
    156 	case 12:
    157 		kn20aa_slot = (device - 11) + 0;
    158 		break;
    159 
    160 	case 7:
    161 		kn20aa_slot = 2;
    162 		break;
    163 
    164 	case 8:
    165 		kn20aa_slot = 4;
    166 		break;
    167 
    168 	case 9:
    169 		kn20aa_slot = 3;
    170 		break;
    171 
    172 	default:
    173 		panic("pci_kn20aa_map_int: invalid device number %d\n",
    174 		    device);
    175 	}
    176 
    177 	kn20aa_irq = (kn20aa_slot * 4) + pin - 1;
    178 	if (kn20aa_irq > KN20AA_MAX_IRQ)
    179 		panic("pci_kn20aa_map_int: kn20aa_irq too large (%d)\n",
    180 		    kn20aa_irq);
    181 
    182 #if 0
    183 	printf("kn20aa_attach_intr: func 0x%lx, arg 0x%lx, level %d, irq %d\n",
    184 	    func, arg, level, kn20aa_irq);
    185 #endif
    186 
    187 	ih = kn20aa_attach_intr(&kn20aa_pci_intrs[kn20aa_irq], level,
    188 	    func, arg);
    189 	kn20aa_enable_intr(kn20aa_irq);
    190 	return (ih);
    191 }
    192 
    193 void
    194 kn20aa_pci_unmap_int(pifa, cookie)
    195 	void *pifa;
    196 	void *cookie;
    197 {
    198 
    199 	panic("kn20aa_pci_unmap_int not implemented");	/* XXX */
    200 }
    201 
    202 /*
    203  * caught a stray interrupt; notify if not too many seen already.
    204  */
    205 void
    206 kn20aa_pci_strayintr(irq)
    207 	int irq;
    208 {
    209 
    210 	if (++kn20aa_pci_strayintrcnt[irq] <= PCI_STRAY_MAX)
    211 		log(LOG_ERR, "stray PCI interrupt %d%s\n", irq,
    212 		    kn20aa_pci_strayintrcnt[irq] >= PCI_STRAY_MAX ?
    213 		    "; stopped logging" : "");
    214 }
    215 
    216 void
    217 kn20aa_iointr(framep, vec)
    218 	void *framep;
    219 	int vec;
    220 {
    221 	struct kn20aa_intrhand *ih;
    222 	int irq, handled;
    223 
    224 	if (vec >= 0x900) {
    225 		if (vec >= 0x900 + (KN20AA_MAX_IRQ << 4))
    226 			panic("kn20aa_iointr: vec 0x%x out of range\n", vec);
    227 		irq = (vec - 0x900) >> 4;
    228 
    229 #ifdef EVCNT_COUNTERS
    230 		kn20aa_intr_evcnt.ev_count++;
    231 #else
    232 		if (KN20AA_MAX_IRQ != INTRCNT_KN20AA_IRQ_LEN)
    233 			panic("kn20aa interrupt counter sizes inconsistent");
    234 		intrcnt[INTRCNT_KN20AA_IRQ + irq]++;
    235 #endif
    236 
    237 		for (ih = kn20aa_pci_intrs[irq].tqh_first, handled = 0;
    238 		    ih != NULL; ih = ih->ih_q.tqe_next) {
    239 			int rv;
    240 
    241 			rv = (*ih->ih_fun)(ih->ih_arg);
    242 
    243 			ih->ih_count++;
    244 			handled = handled || (rv != 0);
    245 		}
    246 		if (!handled)
    247 			kn20aa_pci_strayintr(irq);
    248 		return;
    249 	}
    250 	if (vec >= 0x800) {
    251 #if NSIO
    252 		sio_iointr(framep, vec);
    253 #endif
    254 		return;
    255 	}
    256 	panic("kn20aa_iointr: weird vec 0x%x\n", vec);
    257 }
    258 
    259 void
    260 kn20aa_enable_intr(irq)
    261 	int irq;
    262 {
    263 
    264 	/*
    265 	 * From disassembling the OSF/1 source code:
    266 	 * the following appears to enable a given interrupt request.
    267 	 * "blech."  I'd give valuable body parts for better docs or
    268 	 * for a good decompiler.
    269 	 */
    270 	wbflush();
    271 	REGVAL(0x8780000000L + 0x40L) |= (1 << irq);	/* XXX */
    272 	wbflush();
    273 }
    274 
    275 struct kn20aa_intrhand *
    276 kn20aa_attach_intr(chain, level, func, arg)
    277 	struct kn20aa_intrchain *chain;
    278 	int level;
    279 	int (*func) __P((void *));
    280 	void *arg;
    281 {
    282 	struct kn20aa_intrhand *nintrhand;
    283 
    284 	nintrhand = (struct kn20aa_intrhand *)
    285 	    malloc(sizeof *nintrhand, M_DEVBUF, M_WAITOK);
    286 
    287         nintrhand->ih_fun = func;
    288         nintrhand->ih_arg = arg;
    289         nintrhand->ih_count = 0;
    290         nintrhand->ih_level = level;
    291 	TAILQ_INSERT_TAIL(chain, nintrhand, ih_q);
    292 
    293 	return (nintrhand);
    294 }
    295