timer_isa.c revision 1.6
1 /* $NetBSD: timer_isa.c,v 1.6 2003/07/15 00:04:48 lukem Exp $ */ 2 /* $OpenBSD: clock_mc.c,v 1.9 1998/03/16 09:38:26 pefo Exp $ */ 3 /* NetBSD: clock_mc.c,v 1.2 1995/06/28 04:30:30 cgd Exp */ 4 5 /* 6 * Copyright (c) 1988 University of Utah. 7 * Copyright (c) 1992, 1993 8 * The Regents of the University of California. All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * the Systems Programming Group of the University of Utah Computer 12 * Science Department and Ralph Campbell. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * from: Utah Hdr: clock.c 1.18 91/01/21 43 * 44 * @(#)clock.c 8.1 (Berkeley) 6/10/93 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: timer_isa.c,v 1.6 2003/07/15 00:04:48 lukem Exp $"); 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <sys/systm.h> 53 #include <sys/device.h> 54 55 #include <machine/bus.h> 56 57 #include <dev/isa/isareg.h> 58 #include <dev/isa/isavar.h> 59 60 #include <dev/isa/isareg.h> 61 #include <dev/ic/i8253reg.h> 62 63 #include <arc/arc/timervar.h> 64 #include <arc/isa/timer_isavar.h> 65 66 #define TIMER_IOSIZE 4 67 #define TIMER_IRQ 0 68 69 struct timer_isa_softc { 70 struct device sc_dev; 71 72 bus_space_tag_t sc_iot; 73 bus_space_handle_t sc_ioh; 74 }; 75 76 /* Definition of the driver for autoconfig. */ 77 int timer_isa_match __P((struct device *, struct cfdata *, void *)); 78 void timer_isa_attach __P((struct device *, struct device *, void *)); 79 80 CFATTACH_DECL(timer_isa, sizeof(struct timer_isa_softc), 81 timer_isa_match, timer_isa_attach, NULL, NULL); 82 83 /* ISA timer access code */ 84 void timer_isa_init __P((struct device *)); 85 86 struct timerfns timerfns_isa = { 87 timer_isa_init 88 }; 89 90 int timer_isa_conf = 0; 91 92 int 93 timer_isa_match(parent, match, aux) 94 struct device *parent; 95 struct cfdata *match; 96 void *aux; 97 { 98 struct isa_attach_args *ia = aux; 99 bus_space_handle_t ioh; 100 101 if (ia->ia_nio < 1 || 102 (ia->ia_io[0].ir_addr != ISACF_PORT_DEFAULT && 103 ia->ia_io[0].ir_addr != IO_TIMER1)) 104 return (0); 105 106 if (ia->ia_niomem > 0 && 107 (ia->ia_iomem[0].ir_addr != ISACF_IOMEM_DEFAULT)) 108 return (0); 109 110 if (ia->ia_nirq > 0 && 111 (ia->ia_irq[0].ir_irq != ISACF_IRQ_DEFAULT && 112 ia->ia_irq[0].ir_irq != TIMER_IRQ)) 113 return (0); 114 115 if (ia->ia_ndrq > 0 && 116 (ia->ia_drq[0].ir_drq != ISACF_DRQ_DEFAULT)) 117 return (0); 118 119 if (!timer_isa_conf) 120 return (0); 121 122 if (bus_space_map(ia->ia_iot, IO_TIMER1, TIMER_IOSIZE, 0, &ioh)) 123 return (0); 124 125 bus_space_unmap(ia->ia_iot, ioh, TIMER_IOSIZE); 126 127 ia->ia_nio = 1; 128 ia->ia_io[0].ir_addr = IO_TIMER1; 129 ia->ia_io[0].ir_size = TIMER_IOSIZE; 130 131 ia->ia_niomem = 0; 132 ia->ia_nirq = 0; 133 ia->ia_ndrq = 0; 134 135 return (1); 136 } 137 138 void 139 timer_isa_attach(parent, self, aux) 140 struct device *parent; 141 struct device *self; 142 void *aux; 143 { 144 struct timer_isa_softc *sc = (struct timer_isa_softc *)self; 145 struct isa_attach_args *ia = aux; 146 void *ih; 147 148 printf("\n"); 149 150 sc->sc_iot = ia->ia_iot; 151 if (bus_space_map(sc->sc_iot, ia->ia_io[0].ir_addr, 152 ia->ia_io[0].ir_size, 0, &sc->sc_ioh)) 153 panic("timer_isa_attach: couldn't map clock I/O space"); 154 155 ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq, IST_PULSE, 156 IPL_CLOCK, (int (*)(void *))hardclock, 157 NULL /* clockframe is hardcoded */); 158 if (ih == NULL) 159 printf("%s: can't establish interrupt\n", sc->sc_dev.dv_xname); 160 161 timerattach(&sc->sc_dev, &timerfns_isa); 162 } 163 164 void 165 timer_isa_init(self) 166 struct device *self; 167 { 168 struct timer_isa_softc *sc = (struct timer_isa_softc *)self; 169 170 bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_MODE, 171 TIMER_SEL0 | TIMER_16BIT | TIMER_RATEGEN); 172 bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR0, 173 TIMER_DIV(hz) % 256); 174 bus_space_write_1(sc->sc_iot, sc->sc_ioh, TIMER_CNTR0, 175 TIMER_DIV(hz) / 256); 176 } 177
Indexes created Wed Sep 24 05:09:52 GMT 2025