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pci_kn20aa.c revision 1.5 
      1 /*	$NetBSD: pci_kn20aa.c,v 1.5 1996/06/13 18:32:15 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995, 1996 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 int	dec_kn20aa_intr_map __P((void *, pcitag_t, int, int,
     59 	    pci_intr_handle_t *));
     60 const char *dec_kn20aa_intr_string __P((void *, pci_intr_handle_t));
     61 void	*dec_kn20aa_intr_establish __P((void *, pci_intr_handle_t,
     62 	    int, int (*func)(void *), void *));
     63 void	dec_kn20aa_intr_disestablish __P((void *, void *));
     64 
     65 #define	KN20AA_PCEB_IRQ	31
     66 #define	KN20AA_MAX_IRQ	32
     67 #define	PCI_STRAY_MAX	5
     68 
     69 struct kn20aa_intrhand {
     70 	TAILQ_ENTRY(kn20aa_intrhand) ih_q;
     71         int     (*ih_fun)();
     72         void    *ih_arg;
     73         u_long  ih_count;
     74         int     ih_level;
     75 };
     76 TAILQ_HEAD(kn20aa_intrchain, kn20aa_intrhand);
     77 
     78 struct kn20aa_intrchain kn20aa_pci_intrs[KN20AA_MAX_IRQ];
     79 int	kn20aa_pci_strayintrcnt[KN20AA_MAX_IRQ];
     80 #ifdef EVCNT_COUNTERS
     81 struct evcnt kn20aa_intr_evcnt;
     82 #endif
     83 
     84 void	kn20aa_pci_strayintr __P((int irq));
     85 void	kn20aa_iointr __P((void *framep, int vec));
     86 void	kn20aa_enable_intr __P((int irq));
     87 struct kn20aa_intrhand *kn20aa_attach_intr __P((struct kn20aa_intrchain *,
     88 			    int, int (*) (void *), void *));
     89 
     90 void
     91 pci_kn20aa_pickintr(ccp)
     92 	struct cia_config *ccp;
     93 {
     94 	int i;
     95 	struct kn20aa_intrhand *nintrhand;
     96 	bus_chipset_tag_t bc = &ccp->cc_bc;
     97 	pci_chipset_tag_t pc = &ccp->cc_pc;
     98 
     99 	for (i = 0; i < KN20AA_MAX_IRQ; i++)
    100 		TAILQ_INIT(&kn20aa_pci_intrs[i]);
    101 
    102         pc->pc_intr_v = ccp;
    103         pc->pc_intr_map = dec_kn20aa_intr_map;
    104         pc->pc_intr_string = dec_kn20aa_intr_string;
    105         pc->pc_intr_establish = dec_kn20aa_intr_establish;
    106         pc->pc_intr_disestablish = dec_kn20aa_intr_disestablish;
    107 
    108 #if NSIO
    109 	sio_intr_setup(bc);
    110 #endif
    111 
    112 	set_iointr(kn20aa_iointr);
    113 
    114 #if NSIO
    115 	kn20aa_enable_intr(KN20AA_PCEB_IRQ);
    116 #if 0 /* XXX init PCEB interrupt handler? */
    117 	kn20aa_attach_intr(&kn20aa_pci_intrs[KN20AA_PCEB_IRQ], ???, ???, ???);
    118 #endif
    119 #endif
    120 }
    121 
    122 int
    123 dec_kn20aa_intr_map(ccv, bustag, buspin, line, ihp)
    124         void *ccv;
    125         pcitag_t bustag;
    126         int buspin, line;
    127         pci_intr_handle_t *ihp;
    128 {
    129 	struct cia_config *ccp = ccv;
    130 	pci_chipset_tag_t pc = &ccp->cc_pc;
    131 	int device;
    132 	int kn20aa_slot, kn20aa_irq;
    133 	void *ih;
    134 
    135         if (buspin == 0) {
    136                 /* No IRQ used. */
    137                 return 0;
    138         }
    139         if (buspin > 4) {
    140                 printf("pci_map_int: bad interrupt pin %d\n", buspin);
    141                 return NULL;
    142         }
    143 
    144 	/*
    145 	 * Slot->interrupt translation.  Appears to work, though it
    146 	 * may not hold up forever.
    147 	 *
    148 	 * The DEC engineers who did this hardware obviously engaged
    149 	 * in random drug testing.
    150 	 */
    151 	pci_decompose_tag(pc, bustag, NULL, &device, NULL);
    152 	switch (device) {
    153 	case 11:
    154 	case 12:
    155 		kn20aa_slot = (device - 11) + 0;
    156 		break;
    157 
    158 	case 7:
    159 		kn20aa_slot = 2;
    160 		break;
    161 
    162 	case 8:
    163 		kn20aa_slot = 4;
    164 		break;
    165 
    166 	case 9:
    167 		kn20aa_slot = 3;
    168 		break;
    169 
    170 	default:
    171 		panic("pci_kn20aa_map_int: invalid device number %d\n",
    172 		    device);
    173 	}
    174 
    175 	kn20aa_irq = (kn20aa_slot * 4) + buspin - 1;
    176 	if (kn20aa_irq > KN20AA_MAX_IRQ)
    177 		panic("pci_kn20aa_map_int: kn20aa_irq too large (%d)\n",
    178 		    kn20aa_irq);
    179 
    180 	*ihp = kn20aa_irq;
    181 }
    182 
    183 const char *
    184 dec_kn20aa_intr_string(ccv, ih)
    185 	void *ccv;
    186 	pci_intr_handle_t ih;
    187 {
    188 	struct cia_config *ccp = ccv;
    189         static char irqstr[15];          /* 11 + 2 + NULL + sanity */
    190 
    191         if (ih > KN20AA_MAX_IRQ)
    192                 panic("dec_kn20aa_a50_intr_string: bogus kn20aa IRQ 0x%x\n",
    193 		    ih);
    194 
    195         sprintf(irqstr, "kn20aa irq %d", ih);
    196         return (irqstr);
    197 }
    198 
    199 void *
    200 dec_kn20aa_intr_establish(ccv, ih, level, func, arg)
    201         void *ccv, *arg;
    202         pci_intr_handle_t ih;
    203         int level;
    204         int (*func) __P((void *));
    205 {
    206         struct cia_config *ccp = ccv;
    207 	void *cookie;
    208 
    209         if (ih > KN20AA_MAX_IRQ)
    210                 panic("dec_kn20aa_intr_establish: bogus kn20aa IRQ 0x%x\n",
    211 		    ih);
    212 
    213 	cookie = kn20aa_attach_intr(&kn20aa_pci_intrs[ih], level, func, arg);
    214 	kn20aa_enable_intr(ih);
    215 	return (cookie);
    216 }
    217 
    218 void
    219 dec_kn20aa_intr_disestablish(ccv, cookie)
    220         void *ccv, *cookie;
    221 {
    222 	struct cia_config *ccp = ccv;
    223 
    224 	panic("dec_kn20aa_intr_disestablish not implemented"); /* XXX */
    225 }
    226 
    227 /*
    228  * caught a stray interrupt; notify if not too many seen already.
    229  */
    230 void
    231 kn20aa_pci_strayintr(irq)
    232 	int irq;
    233 {
    234 
    235 	if (++kn20aa_pci_strayintrcnt[irq] <= PCI_STRAY_MAX)
    236 		log(LOG_ERR, "stray PCI interrupt %d%s\n", irq,
    237 		    kn20aa_pci_strayintrcnt[irq] >= PCI_STRAY_MAX ?
    238 		    "; stopped logging" : "");
    239 }
    240 
    241 void
    242 kn20aa_iointr(framep, vec)
    243 	void *framep;
    244 	int vec;
    245 {
    246 	struct kn20aa_intrhand *ih;
    247 	int irq, handled;
    248 
    249 	if (vec >= 0x900) {
    250 		if (vec >= 0x900 + (KN20AA_MAX_IRQ << 4))
    251 			panic("kn20aa_iointr: vec 0x%x out of range\n", vec);
    252 		irq = (vec - 0x900) >> 4;
    253 
    254 #ifdef EVCNT_COUNTERS
    255 		kn20aa_intr_evcnt.ev_count++;
    256 #else
    257 		if (KN20AA_MAX_IRQ != INTRCNT_KN20AA_IRQ_LEN)
    258 			panic("kn20aa interrupt counter sizes inconsistent");
    259 		intrcnt[INTRCNT_KN20AA_IRQ + irq]++;
    260 #endif
    261 
    262 		for (ih = kn20aa_pci_intrs[irq].tqh_first, handled = 0;
    263 		    ih != NULL; ih = ih->ih_q.tqe_next) {
    264 			int rv;
    265 
    266 			rv = (*ih->ih_fun)(ih->ih_arg);
    267 
    268 			ih->ih_count++;
    269 			handled = handled || (rv != 0);
    270 		}
    271 		if (!handled)
    272 			kn20aa_pci_strayintr(irq);
    273 		return;
    274 	}
    275 	if (vec >= 0x800) {
    276 #if NSIO
    277 		sio_iointr(framep, vec);
    278 #endif
    279 		return;
    280 	}
    281 	panic("kn20aa_iointr: weird vec 0x%x\n", vec);
    282 }
    283 
    284 void
    285 kn20aa_enable_intr(irq)
    286 	int irq;
    287 {
    288 
    289 	/*
    290 	 * From disassembling the OSF/1 source code:
    291 	 * the following appears to enable a given interrupt request.
    292 	 * "blech."  I'd give valuable body parts for better docs or
    293 	 * for a good decompiler.
    294 	 */
    295 	wbflush();
    296 	REGVAL(0x8780000000L + 0x40L) |= (1 << irq);	/* XXX */
    297 	wbflush();
    298 }
    299 
    300 struct kn20aa_intrhand *
    301 kn20aa_attach_intr(chain, level, func, arg)
    302 	struct kn20aa_intrchain *chain;
    303 	int level;
    304 	int (*func) __P((void *));
    305 	void *arg;
    306 {
    307 	struct kn20aa_intrhand *nintrhand;
    308 
    309 	nintrhand = (struct kn20aa_intrhand *)
    310 	    malloc(sizeof *nintrhand, M_DEVBUF, M_WAITOK);
    311 
    312         nintrhand->ih_fun = func;
    313         nintrhand->ih_arg = arg;
    314         nintrhand->ih_count = 0;
    315         nintrhand->ih_level = level;
    316 	TAILQ_INSERT_TAIL(chain, nintrhand, ih_q);
    317 
    318 	return (nintrhand);
    319 }
    320