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pci_kn20aa.c revision 1.20 
      1 /*	$NetBSD: pci_kn20aa.c,v 1.20 1996/11/13 21:13:31 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 <machine/autoconf.h>
     42 
     43 #include <dev/pci/pcireg.h>
     44 #include <dev/pci/pcivar.h>
     45 
     46 #include <alpha/pci/ciareg.h>
     47 #include <alpha/pci/ciavar.h>
     48 
     49 #include <alpha/pci/pci_kn20aa.h>
     50 
     51 #ifndef EVCNT_COUNTERS
     52 #include <machine/intrcnt.h>
     53 #endif
     54 
     55 #include "sio.h"
     56 #if NSIO
     57 #include <alpha/pci/siovar.h>
     58 #endif
     59 
     60 int	dec_kn20aa_intr_map __P((void *, pcitag_t, int, int,
     61 	    pci_intr_handle_t *));
     62 const char *dec_kn20aa_intr_string __P((void *, pci_intr_handle_t));
     63 void	*dec_kn20aa_intr_establish __P((void *, pci_intr_handle_t,
     64 	    int, int (*func)(void *), void *));
     65 void	dec_kn20aa_intr_disestablish __P((void *, void *));
     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) __P((void *));
     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, unsigned long vec));
     88 void	kn20aa_enable_intr __P((int irq));
     89 void	kn20aa_disable_intr __P((int irq));
     90 struct kn20aa_intrhand *kn20aa_attach_intr __P((struct kn20aa_intrchain *,
     91 			    int, int (*) (void *), void *));
     92 
     93 void
     94 pci_kn20aa_pickintr(ccp)
     95 	struct cia_config *ccp;
     96 {
     97 	int i;
     98 	bus_space_tag_t iot = ccp->cc_iot;
     99 	pci_chipset_tag_t pc = &ccp->cc_pc;
    100 
    101 	for (i = 0; i < KN20AA_MAX_IRQ; i++)
    102 		TAILQ_INIT(&kn20aa_pci_intrs[i]);
    103 
    104         pc->pc_intr_v = ccp;
    105         pc->pc_intr_map = dec_kn20aa_intr_map;
    106         pc->pc_intr_string = dec_kn20aa_intr_string;
    107         pc->pc_intr_establish = dec_kn20aa_intr_establish;
    108         pc->pc_intr_disestablish = dec_kn20aa_intr_disestablish;
    109 
    110 #if NSIO
    111 	sio_intr_setup(iot);
    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 int
    125 dec_kn20aa_intr_map(ccv, bustag, buspin, line, ihp)
    126         void *ccv;
    127         pcitag_t bustag;
    128         int buspin, line;
    129         pci_intr_handle_t *ihp;
    130 {
    131 	struct cia_config *ccp = ccv;
    132 	pci_chipset_tag_t pc = &ccp->cc_pc;
    133 	int device;
    134 	int kn20aa_irq;
    135 
    136         if (buspin == 0) {
    137                 /* No IRQ used. */
    138                 return 1;
    139         }
    140         if (buspin > 4) {
    141                 printf("pci_map_int: bad interrupt pin %d\n", buspin);
    142                 return 1;
    143         }
    144 
    145 	/*
    146 	 * Slot->interrupt translation.  Appears to work, though it
    147 	 * may not hold up forever.
    148 	 *
    149 	 * The DEC engineers who did this hardware obviously engaged
    150 	 * in random drug testing.
    151 	 */
    152 	pci_decompose_tag(pc, bustag, NULL, &device, NULL);
    153 	switch (device) {
    154 	case 11:
    155 	case 12:
    156 		kn20aa_irq = ((device - 11) + 0) * 4;
    157 		break;
    158 
    159 	case 7:
    160 		kn20aa_irq = 8;
    161 		break;
    162 
    163 	case 9:
    164 		kn20aa_irq = 12;
    165 		break;
    166 
    167 	case 6:					/* 21040 on AlphaStation 500 */
    168 		kn20aa_irq = 13;
    169 		break;
    170 
    171 	case 8:
    172 		kn20aa_irq = 16;
    173 		break;
    174 
    175 	default:
    176                 printf("dec_kn20aa_intr_map: weird device number %d\n",
    177 		    device);
    178                 return 1;
    179 	}
    180 
    181 	kn20aa_irq += buspin - 1;
    182 	if (kn20aa_irq > KN20AA_MAX_IRQ)
    183 		panic("pci_kn20aa_map_int: kn20aa_irq too large (%d)\n",
    184 		    kn20aa_irq);
    185 
    186 	*ihp = kn20aa_irq;
    187 	return (0);
    188 }
    189 
    190 const char *
    191 dec_kn20aa_intr_string(ccv, ih)
    192 	void *ccv;
    193 	pci_intr_handle_t ih;
    194 {
    195 #if 0
    196 	struct cia_config *ccp = ccv;
    197 #endif
    198         static char irqstr[15];          /* 11 + 2 + NULL + sanity */
    199 
    200         if (ih > KN20AA_MAX_IRQ)
    201                 panic("dec_kn20aa_a50_intr_string: bogus kn20aa IRQ 0x%x\n",
    202 		    ih);
    203 
    204         sprintf(irqstr, "kn20aa irq %ld", ih);
    205         return (irqstr);
    206 }
    207 
    208 void *
    209 dec_kn20aa_intr_establish(ccv, ih, level, func, arg)
    210         void *ccv, *arg;
    211         pci_intr_handle_t ih;
    212         int level;
    213         int (*func) __P((void *));
    214 {
    215 #if 0
    216         struct cia_config *ccp = ccv;
    217 #endif
    218 	void *cookie;
    219 
    220         if (ih > KN20AA_MAX_IRQ)
    221                 panic("dec_kn20aa_intr_establish: bogus kn20aa IRQ 0x%x\n",
    222 		    ih);
    223 
    224 	cookie = kn20aa_attach_intr(&kn20aa_pci_intrs[ih], level, func, arg);
    225 	kn20aa_enable_intr(ih);
    226 	return (cookie);
    227 }
    228 
    229 void
    230 dec_kn20aa_intr_disestablish(ccv, cookie)
    231         void *ccv, *cookie;
    232 {
    233 #if 0
    234 	struct cia_config *ccp = ccv;
    235 #endif
    236 
    237 	panic("dec_kn20aa_intr_disestablish not implemented"); /* XXX */
    238 }
    239 
    240 /*
    241  * caught a stray interrupt; notify if not too many seen already.
    242  */
    243 void
    244 kn20aa_pci_strayintr(irq)
    245 	int irq;
    246 {
    247 
    248 	kn20aa_pci_strayintrcnt[irq]++;
    249 	if (kn20aa_pci_strayintrcnt[irq] == PCI_STRAY_MAX)
    250 		kn20aa_disable_intr(irq);
    251 
    252 	log(LOG_ERR, "stray kn20aa irq %d\n", irq);
    253 	if (kn20aa_pci_strayintrcnt[irq] == PCI_STRAY_MAX)
    254 		log(LOG_ERR, "disabling interrupts on kn20aa irq %d\n", irq);
    255 }
    256 
    257 void
    258 kn20aa_iointr(framep, vec)
    259 	void *framep;
    260 	unsigned long vec;
    261 {
    262 	struct kn20aa_intrhand *ih;
    263 	int irq, handled;
    264 
    265 	if (vec >= 0x900) {
    266 		if (vec >= 0x900 + (KN20AA_MAX_IRQ << 4))
    267 			panic("kn20aa_iointr: vec 0x%x out of range\n", vec);
    268 		irq = (vec - 0x900) >> 4;
    269 
    270 #ifdef EVCNT_COUNTERS
    271 		kn20aa_intr_evcnt.ev_count++;
    272 #else
    273 		if (KN20AA_MAX_IRQ != INTRCNT_KN20AA_IRQ_LEN)
    274 			panic("kn20aa interrupt counter sizes inconsistent");
    275 		intrcnt[INTRCNT_KN20AA_IRQ + irq]++;
    276 #endif
    277 
    278 		for (ih = kn20aa_pci_intrs[irq].tqh_first, handled = 0;
    279 		    ih != NULL; ih = ih->ih_q.tqe_next) {
    280 			int rv;
    281 
    282 			rv = (*ih->ih_fun)(ih->ih_arg);
    283 
    284 			ih->ih_count++;
    285 			handled = handled || (rv != 0);
    286 		}
    287 		if (!handled)
    288 			kn20aa_pci_strayintr(irq);
    289 		return;
    290 	}
    291 	if (vec >= 0x800) {
    292 #if NSIO
    293 		sio_iointr(framep, vec);
    294 #endif
    295 		return;
    296 	}
    297 	panic("kn20aa_iointr: weird vec 0x%x\n", vec);
    298 }
    299 
    300 void
    301 kn20aa_enable_intr(irq)
    302 	int irq;
    303 {
    304 
    305 	/*
    306 	 * From disassembling small bits of the OSF/1 kernel:
    307 	 * the following appears to enable a given interrupt request.
    308 	 * "blech."  I'd give valuable body parts for better docs or
    309 	 * for a good decompiler.
    310 	 */
    311 	alpha_mb();
    312 	REGVAL(0x8780000000L + 0x40L) |= (1 << irq);	/* XXX */
    313 	alpha_mb();
    314 }
    315 
    316 void
    317 kn20aa_disable_intr(irq)
    318 	int irq;
    319 {
    320 
    321 	alpha_mb();
    322 	REGVAL(0x8780000000L + 0x40L) &= ~(1 << irq);	/* XXX */
    323 	alpha_mb();
    324 }
    325 
    326 struct kn20aa_intrhand *
    327 kn20aa_attach_intr(chain, level, func, arg)
    328 	struct kn20aa_intrchain *chain;
    329 	int level;
    330 	int (*func) __P((void *));
    331 	void *arg;
    332 {
    333 	struct kn20aa_intrhand *nintrhand;
    334 
    335 	nintrhand = (struct kn20aa_intrhand *)
    336 	    malloc(sizeof *nintrhand, M_DEVBUF, M_WAITOK);
    337 
    338         nintrhand->ih_fun = func;
    339         nintrhand->ih_arg = arg;
    340         nintrhand->ih_count = 0;
    341         nintrhand->ih_level = level;
    342 	TAILQ_INSERT_TAIL(chain, nintrhand, ih_q);
    343 
    344 	return (nintrhand);
    345 }
    346