1/* $NetBSD: mcclock_isa.c,v 1.22 2024/03/06 06:30:49 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@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: mcclock_isa.c,v 1.22 2024/03/06 06:30:49 thorpej Exp $"); 33 34#include <sys/param.h> 35#include <sys/kernel.h> 36#include <sys/systm.h> 37#include <sys/device.h> 38 39#include <sys/bus.h> 40 41#include <dev/clock_subr.h> 42 43#include <dev/ic/mc146818reg.h> 44#include <dev/ic/mc146818var.h> 45#include <dev/isa/isavar.h> 46 47#include <alpha/alpha/mcclockvar.h> 48 49static int mcclock_isa_match(device_t, cfdata_t, void *); 50static void mcclock_isa_attach(device_t, device_t, void *); 51 52CFATTACH_DECL_NEW(mcclock_isa, sizeof(struct mcclock_softc), 53 mcclock_isa_match, mcclock_isa_attach, NULL, NULL); 54 55static void mcclock_isa_write(struct mc146818_softc *, u_int, u_int); 56static u_int mcclock_isa_read(struct mc146818_softc *, u_int); 57 58static int 59mcclock_isa_match(device_t parent, cfdata_t cf, void *aux) 60{ 61 struct isa_attach_args *ia = aux; 62 bus_space_handle_t ioh; 63 64 if (ia->ia_nio < 1 || 65 (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT && 66 ia->ia_io[0].ir_addr != 0x70)) 67 return (0); 68 69 if (ia->ia_niomem > 0 && 70 (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM)) 71 return (0); 72 73 if (ia->ia_nirq > 0 && 74 (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ)) 75 return (0); 76 77 if (ia->ia_ndrq > 0 && 78 (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ)) 79 return (0); 80 81 if (bus_space_map(ia->ia_iot, 0x70, 0x2, 0, &ioh)) 82 return (0); 83 84 bus_space_unmap(ia->ia_iot, ioh, 0x2); 85 86 ia->ia_nio = 1; 87 ia->ia_io[0].ir_addr = 0x70; 88 ia->ia_io[0].ir_size = 0x02; 89 90 ia->ia_niomem = 0; 91 ia->ia_nirq = 0; 92 ia->ia_ndrq = 0; 93 94 return (1); 95} 96 97static void 98mcclock_isa_attach(device_t parent, device_t self, void *aux) 99{ 100 struct mcclock_softc *msc = device_private(self); 101 struct mc146818_softc *sc = &msc->sc_mc146818; 102 struct isa_attach_args *ia = aux; 103 104 sc->sc_dev = self; 105 sc->sc_bst = ia->ia_iot; 106 if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr, 107 ia->ia_io[0].ir_size, 0, &sc->sc_bsh)) 108 panic("mcclock_isa_attach: couldn't map clock I/O space"); 109 110 sc->sc_mcread = mcclock_isa_read; 111 sc->sc_mcwrite = mcclock_isa_write; 112 113 mcclock_attach(msc); 114} 115 116static void 117mcclock_isa_write(struct mc146818_softc *sc, u_int reg, u_int datum) 118{ 119 bus_space_tag_t iot = sc->sc_bst; 120 bus_space_handle_t ioh = sc->sc_bsh; 121 122 bus_space_write_1(iot, ioh, 0, reg); 123 bus_space_write_1(iot, ioh, 1, datum); 124} 125 126static u_int 127mcclock_isa_read(struct mc146818_softc *sc, u_int reg) 128{ 129 bus_space_tag_t iot = sc->sc_bst; 130 bus_space_handle_t ioh = sc->sc_bsh; 131 132 bus_space_write_1(iot, ioh, 0, reg); 133 return bus_space_read_1(iot, ioh, 1); 134} 135