pci_kn20aa.c revision 1.55
1 /* $NetBSD: pci_kn20aa.c,v 1.55 2020/09/22 15:24:02 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 1.55 2020/09/22 15:24:02 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/malloc.h> 40 #include <sys/device.h> 41 #include <sys/syslog.h> 42 43 #include <machine/autoconf.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 <alpha/pci/pci_kn20aa.h> 52 53 #include "sio.h" 54 #if NSIO > 0 || NPCEB > 0 55 #include <alpha/pci/siovar.h> 56 #endif 57 58 static int dec_kn20aa_intr_map(const struct pci_attach_args *, 59 pci_intr_handle_t *); 60 61 #define KN20AA_PCEB_IRQ 31 62 #define KN20AA_MAX_IRQ 32 63 #define PCI_STRAY_MAX 5 64 65 static void kn20aa_enable_intr(pci_chipset_tag_t pc, int irq); 66 static void kn20aa_disable_intr(pci_chipset_tag_t pc, int irq); 67 68 void 69 pci_kn20aa_pickintr(struct cia_config *ccp) 70 { 71 int i; 72 #if NSIO > 0 || NPCEB > 0 73 bus_space_tag_t iot = &ccp->cc_iot; 74 #endif 75 pci_chipset_tag_t pc = &ccp->cc_pc; 76 char *cp; 77 78 pc->pc_intr_v = ccp; 79 pc->pc_intr_map = dec_kn20aa_intr_map; 80 pc->pc_intr_string = alpha_pci_generic_intr_string; 81 pc->pc_intr_evcnt = alpha_pci_generic_intr_evcnt; 82 pc->pc_intr_establish = alpha_pci_generic_intr_establish; 83 pc->pc_intr_disestablish = alpha_pci_generic_intr_disestablish; 84 85 /* Not supported on KN20AA. */ 86 pc->pc_pciide_compat_intr_establish = NULL; 87 88 #define PCI_KN20AA_IRQ_STR 8 89 pc->pc_shared_intrs = alpha_shared_intr_alloc(KN20AA_MAX_IRQ, 90 PCI_KN20AA_IRQ_STR); 91 pc->pc_intr_desc = "kn20aa irq"; 92 pc->pc_vecbase = 0x900; 93 pc->pc_nirq = KN20AA_MAX_IRQ; 94 95 pc->pc_intr_enable = kn20aa_enable_intr; 96 pc->pc_intr_disable = kn20aa_disable_intr; 97 98 for (i = 0; i < KN20AA_MAX_IRQ; i++) { 99 alpha_shared_intr_set_maxstrays(pc->pc_shared_intrs, i, 100 PCI_STRAY_MAX); 101 102 cp = alpha_shared_intr_string(pc->pc_shared_intrs, i); 103 snprintf(cp, PCI_KN20AA_IRQ_STR, "irq %d", i); 104 evcnt_attach_dynamic(alpha_shared_intr_evcnt( 105 pc->pc_shared_intrs, i), EVCNT_TYPE_INTR, NULL, 106 "kn20aa", cp); 107 } 108 109 #if NSIO > 0 || NPCEB > 0 110 sio_intr_setup(pc, iot); 111 kn20aa_enable_intr(pc, KN20AA_PCEB_IRQ); 112 #endif 113 } 114 115 static int 116 dec_kn20aa_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp) 117 { 118 pcitag_t bustag = pa->pa_intrtag; 119 int buspin = pa->pa_intrpin; 120 pci_chipset_tag_t pc = pa->pa_pc; 121 int device; 122 int kn20aa_irq; 123 124 if (buspin == 0) { 125 /* No IRQ used. */ 126 return 1; 127 } 128 if (buspin < 0 || buspin > 4) { 129 printf("dec_kn20aa_intr_map: bad interrupt pin %d\n", buspin); 130 return 1; 131 } 132 133 /* 134 * Slot->interrupt translation. Appears to work, though it 135 * may not hold up forever. 136 * 137 * The DEC engineers who did this hardware obviously engaged 138 * in random drug testing. 139 */ 140 pci_decompose_tag(pc, bustag, NULL, &device, NULL); 141 switch (device) { 142 case 11: 143 case 12: 144 kn20aa_irq = ((device - 11) + 0) * 4; 145 break; 146 147 case 7: 148 kn20aa_irq = 8; 149 break; 150 151 case 9: 152 kn20aa_irq = 12; 153 break; 154 155 case 6: /* 21040 on AlphaStation 500 */ 156 kn20aa_irq = 13; 157 break; 158 159 case 8: 160 kn20aa_irq = 16; 161 break; 162 163 default: 164 printf("dec_kn20aa_intr_map: weird device number %d\n", 165 device); 166 return 1; 167 } 168 169 kn20aa_irq += buspin - 1; 170 if (kn20aa_irq > KN20AA_MAX_IRQ) 171 panic("dec_kn20aa_intr_map: kn20aa_irq too large (%d)", 172 kn20aa_irq); 173 174 alpha_pci_intr_handle_init(ihp, kn20aa_irq, 0); 175 return (0); 176 } 177 178 static void 179 kn20aa_enable_intr(pci_chipset_tag_t pc __unused, int irq) 180 { 181 182 /* 183 * From disassembling small bits of the OSF/1 kernel: 184 * the following appears to enable a given interrupt request. 185 * "blech." I'd give valuable body parts for better docs or 186 * for a good decompiler. 187 */ 188 alpha_mb(); 189 REGVAL(0x8780000000L + 0x40L) |= (1 << irq); /* XXX */ 190 alpha_mb(); 191 } 192 193 static void 194 kn20aa_disable_intr(pci_chipset_tag_t pc __unused, int irq) 195 { 196 197 alpha_mb(); 198 REGVAL(0x8780000000L + 0x40L) &= ~(1 << irq); /* XXX */ 199 alpha_mb(); 200 } 201
Indexes created Tue Sep 30 20:09:53 GMT 2025