pci_kn20aa.c revision 1.56
1 /* $NetBSD: pci_kn20aa.c,v 1.56 2021/06/19 16:59:07 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 1.56 2021/06/19 16:59:07 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 #include <machine/rpb.h> 45 46 #include <dev/pci/pcireg.h> 47 #include <dev/pci/pcivar.h> 48 49 #include <alpha/pci/ciareg.h> 50 #include <alpha/pci/ciavar.h> 51 52 #include "sio.h" 53 #if NSIO > 0 || NPCEB > 0 54 #include <alpha/pci/siovar.h> 55 #endif 56 57 static int dec_kn20aa_intr_map(const struct pci_attach_args *, 58 pci_intr_handle_t *); 59 60 #define KN20AA_PCEB_IRQ 31 61 #define KN20AA_MAX_IRQ 32 62 #define PCI_STRAY_MAX 5 63 64 static void kn20aa_enable_intr(pci_chipset_tag_t pc, int irq); 65 static void kn20aa_disable_intr(pci_chipset_tag_t pc, int irq); 66 67 static void 68 pci_kn20aa_pickintr(void *core, bus_space_tag_t iot, bus_space_tag_t memt, 69 pci_chipset_tag_t pc) 70 { 71 int i; 72 char *cp; 73 74 pc->pc_intr_v = core; 75 pc->pc_intr_map = dec_kn20aa_intr_map; 76 pc->pc_intr_string = alpha_pci_generic_intr_string; 77 pc->pc_intr_evcnt = alpha_pci_generic_intr_evcnt; 78 pc->pc_intr_establish = alpha_pci_generic_intr_establish; 79 pc->pc_intr_disestablish = alpha_pci_generic_intr_disestablish; 80 81 /* Not supported on KN20AA. */ 82 pc->pc_pciide_compat_intr_establish = NULL; 83 84 #define PCI_KN20AA_IRQ_STR 8 85 pc->pc_shared_intrs = alpha_shared_intr_alloc(KN20AA_MAX_IRQ, 86 PCI_KN20AA_IRQ_STR); 87 pc->pc_intr_desc = "kn20aa irq"; 88 pc->pc_vecbase = 0x900; 89 pc->pc_nirq = KN20AA_MAX_IRQ; 90 91 pc->pc_intr_enable = kn20aa_enable_intr; 92 pc->pc_intr_disable = kn20aa_disable_intr; 93 94 for (i = 0; i < KN20AA_MAX_IRQ; i++) { 95 alpha_shared_intr_set_maxstrays(pc->pc_shared_intrs, i, 96 PCI_STRAY_MAX); 97 98 cp = alpha_shared_intr_string(pc->pc_shared_intrs, i); 99 snprintf(cp, PCI_KN20AA_IRQ_STR, "irq %d", i); 100 evcnt_attach_dynamic(alpha_shared_intr_evcnt( 101 pc->pc_shared_intrs, i), EVCNT_TYPE_INTR, NULL, 102 "kn20aa", cp); 103 } 104 105 #if NSIO > 0 || NPCEB > 0 106 sio_intr_setup(pc, iot); 107 kn20aa_enable_intr(pc, KN20AA_PCEB_IRQ); 108 #endif 109 } 110 ALPHA_PCI_INTR_INIT(ST_DEC_KN20AA, pci_kn20aa_pickintr) 111 112 static int 113 dec_kn20aa_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp) 114 { 115 pcitag_t bustag = pa->pa_intrtag; 116 int buspin = pa->pa_intrpin; 117 pci_chipset_tag_t pc = pa->pa_pc; 118 int device; 119 int kn20aa_irq; 120 121 if (buspin == 0) { 122 /* No IRQ used. */ 123 return 1; 124 } 125 if (buspin < 0 || buspin > 4) { 126 printf("dec_kn20aa_intr_map: bad interrupt pin %d\n", buspin); 127 return 1; 128 } 129 130 /* 131 * Slot->interrupt translation. Appears to work, though it 132 * may not hold up forever. 133 * 134 * The DEC engineers who did this hardware obviously engaged 135 * in random drug testing. 136 */ 137 pci_decompose_tag(pc, bustag, NULL, &device, NULL); 138 switch (device) { 139 case 11: 140 case 12: 141 kn20aa_irq = ((device - 11) + 0) * 4; 142 break; 143 144 case 7: 145 kn20aa_irq = 8; 146 break; 147 148 case 9: 149 kn20aa_irq = 12; 150 break; 151 152 case 6: /* 21040 on AlphaStation 500 */ 153 kn20aa_irq = 13; 154 break; 155 156 case 8: 157 kn20aa_irq = 16; 158 break; 159 160 default: 161 printf("dec_kn20aa_intr_map: weird device number %d\n", 162 device); 163 return 1; 164 } 165 166 kn20aa_irq += buspin - 1; 167 if (kn20aa_irq > KN20AA_MAX_IRQ) 168 panic("dec_kn20aa_intr_map: kn20aa_irq too large (%d)", 169 kn20aa_irq); 170 171 alpha_pci_intr_handle_init(ihp, kn20aa_irq, 0); 172 return (0); 173 } 174 175 static void 176 kn20aa_enable_intr(pci_chipset_tag_t pc __unused, int irq) 177 { 178 179 /* 180 * From disassembling small bits of the OSF/1 kernel: 181 * the following appears to enable a given interrupt request. 182 * "blech." I'd give valuable body parts for better docs or 183 * for a good decompiler. 184 */ 185 alpha_mb(); 186 REGVAL(0x8780000000L + 0x40L) |= (1 << irq); /* XXX */ 187 alpha_mb(); 188 } 189 190 static void 191 kn20aa_disable_intr(pci_chipset_tag_t pc __unused, int irq) 192 { 193 194 alpha_mb(); 195 REGVAL(0x8780000000L + 0x40L) &= ~(1 << irq); /* XXX */ 196 alpha_mb(); 197 } 198
Indexes created Tue Sep 30 20:09:53 GMT 2025