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      1 /* $NetBSD: pci_kn20aa.c,v 1.59 2021/07/04 22:42:36 thorpej 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/cdefs.h>			/* RCS ID & Copyright macro defns */
     31 
     32 __KERNEL_RCSID(0, "$NetBSD: pci_kn20aa.c,v 1.59 2021/07/04 22:42:36 thorpej Exp $");
     33 
     34 #include <sys/types.h>
     35 #include <sys/param.h>
     36 #include <sys/time.h>
     37 #include <sys/systm.h>
     38 #include <sys/errno.h>
     39 #include <sys/device.h>
     40 #include <sys/syslog.h>
     41 
     42 #include <machine/autoconf.h>
     43 #include <machine/rpb.h>
     44 
     45 #include <dev/pci/pcireg.h>
     46 #include <dev/pci/pcivar.h>
     47 
     48 #include <alpha/pci/ciareg.h>
     49 #include <alpha/pci/ciavar.h>
     50 
     51 #include "sio.h"
     52 #if NSIO > 0 || NPCEB > 0
     53 #include <alpha/pci/siovar.h>
     54 #endif
     55 
     56 static int	dec_kn20aa_intr_map(const struct pci_attach_args *,
     57 		    pci_intr_handle_t *);
     58 
     59 #define	KN20AA_PCEB_IRQ	31
     60 #define	KN20AA_MAX_IRQ	32
     61 #define	PCI_STRAY_MAX	5
     62 
     63 static void	kn20aa_enable_intr(pci_chipset_tag_t pc, int irq);
     64 static void	kn20aa_disable_intr(pci_chipset_tag_t pc, int irq);
     65 
     66 static void
     67 pci_kn20aa_pickintr(void *core, bus_space_tag_t iot, bus_space_tag_t memt,
     68     pci_chipset_tag_t pc)
     69 {
     70 	int i;
     71 
     72 	pc->pc_intr_v = core;
     73 	pc->pc_intr_map = dec_kn20aa_intr_map;
     74 	pc->pc_intr_string = alpha_pci_generic_intr_string;
     75 	pc->pc_intr_evcnt = alpha_pci_generic_intr_evcnt;
     76 	pc->pc_intr_establish = alpha_pci_generic_intr_establish;
     77 	pc->pc_intr_disestablish = alpha_pci_generic_intr_disestablish;
     78 
     79 	/* Not supported on KN20AA. */
     80 	pc->pc_pciide_compat_intr_establish = NULL;
     81 
     82 	pc->pc_intr_desc = "kn20aa";
     83 	pc->pc_vecbase = 0x900;
     84 	pc->pc_nirq = KN20AA_MAX_IRQ;
     85 
     86 	pc->pc_intr_enable = kn20aa_enable_intr;
     87 	pc->pc_intr_disable = kn20aa_disable_intr;
     88 
     89 	for (i = 0; i < KN20AA_MAX_IRQ; i++) {
     90 		kn20aa_disable_intr(pc, i);
     91 	}
     92 
     93 	alpha_pci_intr_alloc(pc, PCI_STRAY_MAX);
     94 
     95 #if NSIO > 0 || NPCEB > 0
     96 	sio_intr_setup(pc, iot);
     97 	kn20aa_enable_intr(pc, KN20AA_PCEB_IRQ);
     98 #endif
     99 }
    100 ALPHA_PCI_INTR_INIT(ST_DEC_KN20AA, pci_kn20aa_pickintr)
    101 
    102 static int
    103 dec_kn20aa_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp)
    104 {
    105 	pcitag_t bustag = pa->pa_intrtag;
    106 	int buspin = pa->pa_intrpin;
    107 	pci_chipset_tag_t pc = pa->pa_pc;
    108 	int device;
    109 	int kn20aa_irq;
    110 
    111 	if (buspin == 0) {
    112 		/* No IRQ used. */
    113 		return 1;
    114 	}
    115 	if (buspin < 0 || buspin > 4) {
    116 		printf("dec_kn20aa_intr_map: bad interrupt pin %d\n", buspin);
    117 		return 1;
    118 	}
    119 
    120 	/*
    121 	 * Slot->interrupt translation.  Appears to work, though it
    122 	 * may not hold up forever.
    123 	 *
    124 	 * The DEC engineers who did this hardware obviously engaged
    125 	 * in random drug testing.
    126 	 */
    127 	pci_decompose_tag(pc, bustag, NULL, &device, NULL);
    128 	switch (device) {
    129 	case 11:
    130 	case 12:
    131 		kn20aa_irq = ((device - 11) + 0) * 4;
    132 		break;
    133 
    134 	case 7:
    135 		kn20aa_irq = 8;
    136 		break;
    137 
    138 	case 9:
    139 		kn20aa_irq = 12;
    140 		break;
    141 
    142 	case 6:					/* 21040 on AlphaStation 500 */
    143 		kn20aa_irq = 13;
    144 		break;
    145 
    146 	case 8:
    147 		kn20aa_irq = 16;
    148 		break;
    149 
    150 	default:
    151 	        printf("dec_kn20aa_intr_map: weird device number %d\n",
    152 		    device);
    153 	        return 1;
    154 	}
    155 
    156 	kn20aa_irq += buspin - 1;
    157 	if (kn20aa_irq > KN20AA_MAX_IRQ)
    158 		panic("dec_kn20aa_intr_map: kn20aa_irq too large (%d)",
    159 		    kn20aa_irq);
    160 
    161 	alpha_pci_intr_handle_init(ihp, kn20aa_irq, 0);
    162 	return (0);
    163 }
    164 
    165 static void
    166 kn20aa_enable_intr(pci_chipset_tag_t pc __unused, int irq)
    167 {
    168 
    169 	/*
    170 	 * From disassembling small bits of the OSF/1 kernel:
    171 	 * the following appears to enable a given interrupt request.
    172 	 * "blech."  I'd give valuable body parts for better docs or
    173 	 * for a good decompiler.
    174 	 */
    175 	alpha_mb();
    176 	REGVAL(0x8780000000L + 0x40L) |= (1 << irq);	/* XXX */
    177 	alpha_mb();
    178 }
    179 
    180 static void
    181 kn20aa_disable_intr(pci_chipset_tag_t pc __unused, int irq)
    182 {
    183 
    184 	alpha_mb();
    185 	REGVAL(0x8780000000L + 0x40L) &= ~(1 << irq);	/* XXX */
    186 	alpha_mb();
    187 }
    188