rambo.c revision 1.3.2.2
1 1.3.2.2 bouyer /* $NetBSD: rambo.c,v 1.3.2.2 2000/11/20 20:14:11 bouyer Exp $ */ 2 1.3.2.2 bouyer 3 1.3.2.2 bouyer /* 4 1.3.2.2 bouyer * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 1.3.2.2 bouyer * All rights reserved. 6 1.3.2.2 bouyer * 7 1.3.2.2 bouyer * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 bouyer * by Wayne Knowles 9 1.3.2.2 bouyer * 10 1.3.2.2 bouyer * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 bouyer * modification, are permitted provided that the following conditions 12 1.3.2.2 bouyer * are met: 13 1.3.2.2 bouyer * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 bouyer * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 bouyer * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 bouyer * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 bouyer * documentation and/or other materials provided with the distribution. 18 1.3.2.2 bouyer * 3. All advertising materials mentioning features or use of this software 19 1.3.2.2 bouyer * must display the following acknowledgement: 20 1.3.2.2 bouyer * This product includes software developed by the NetBSD 21 1.3.2.2 bouyer * Foundation, Inc. and its contributors. 22 1.3.2.2 bouyer * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.3.2.2 bouyer * contributors may be used to endorse or promote products derived 24 1.3.2.2 bouyer * from this software without specific prior written permission. 25 1.3.2.2 bouyer * 26 1.3.2.2 bouyer * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.3.2.2 bouyer * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.3.2.2 bouyer * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.3.2.2 bouyer * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.3.2.2 bouyer * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.3.2.2 bouyer * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.3.2.2 bouyer * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.3.2.2 bouyer * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.3.2.2 bouyer * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.3.2.2 bouyer * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.3.2.2 bouyer * POSSIBILITY OF SUCH DAMAGE. 37 1.3.2.2 bouyer */ 38 1.3.2.2 bouyer 39 1.3.2.2 bouyer #include <sys/param.h> 40 1.3.2.2 bouyer #include <sys/kernel.h> 41 1.3.2.2 bouyer #include <sys/device.h> 42 1.3.2.2 bouyer #include <sys/systm.h> 43 1.3.2.2 bouyer 44 1.3.2.2 bouyer #include <machine/cpu.h> 45 1.3.2.2 bouyer #include <machine/mainboard.h> 46 1.3.2.2 bouyer #include <machine/autoconf.h> 47 1.3.2.2 bouyer #include <machine/sysconf.h> 48 1.3.2.2 bouyer #include <machine/bus.h> 49 1.3.2.2 bouyer 50 1.3.2.2 bouyer #include <mipsco/obio/rambo.h> 51 1.3.2.2 bouyer 52 1.3.2.2 bouyer /* 53 1.3.2.2 bouyer * Timer & Interrupt manipulation routines for the Rambo Custom ASIC 54 1.3.2.2 bouyer */ 55 1.3.2.2 bouyer 56 1.3.2.2 bouyer static int rambo_match __P((struct device *, struct cfdata *, void *)); 57 1.3.2.2 bouyer static void rambo_attach __P((struct device *, struct device *, void *)); 58 1.3.2.2 bouyer static unsigned rambo_clkread __P((void)); 59 1.3.2.2 bouyer void rambo_clkintr __P((struct clockframe *)); 60 1.3.2.2 bouyer 61 1.3.2.2 bouyer struct rambo_softc { 62 1.3.2.2 bouyer struct device dev; 63 1.3.2.2 bouyer struct evcnt sc_intrcnt; 64 1.3.2.2 bouyer bus_space_tag_t sc_bst; 65 1.3.2.2 bouyer bus_space_handle_t sc_bsh; 66 1.3.2.2 bouyer u_int32_t sc_tclast; 67 1.3.2.2 bouyer u_int32_t sc_hzticks; 68 1.3.2.2 bouyer }; 69 1.3.2.2 bouyer 70 1.3.2.2 bouyer static struct rambo_softc *rambo; 71 1.3.2.2 bouyer 72 1.3.2.2 bouyer struct cfattach rambo_ca = { 73 1.3.2.2 bouyer sizeof(struct rambo_softc), rambo_match, rambo_attach 74 1.3.2.2 bouyer }; 75 1.3.2.2 bouyer 76 1.3.2.2 bouyer static int 77 1.3.2.2 bouyer rambo_match(parent, cf, aux) 78 1.3.2.2 bouyer struct device *parent; 79 1.3.2.2 bouyer struct cfdata *cf; 80 1.3.2.2 bouyer void *aux; 81 1.3.2.2 bouyer { 82 1.3.2.2 bouyer return 1; 83 1.3.2.2 bouyer } 84 1.3.2.2 bouyer 85 1.3.2.2 bouyer static void 86 1.3.2.2 bouyer rambo_attach(parent, self, aux) 87 1.3.2.2 bouyer struct device *parent, *self; 88 1.3.2.2 bouyer void *aux; 89 1.3.2.2 bouyer { 90 1.3.2.2 bouyer struct confargs *ca = aux; 91 1.3.2.2 bouyer struct rambo_softc *sc = (void *)self; 92 1.3.2.2 bouyer 93 1.3.2.2 bouyer sc->sc_bst = ca->ca_bustag; 94 1.3.2.2 bouyer 95 1.3.2.2 bouyer if (bus_space_map(ca->ca_bustag, ca->ca_addr, 256, 96 1.3.2.2 bouyer BUS_SPACE_MAP_LINEAR, 97 1.3.2.2 bouyer &sc->sc_bsh) != 0) { 98 1.3.2.2 bouyer printf(": cannot map registers\n"); 99 1.3.2.2 bouyer return; 100 1.3.2.2 bouyer } 101 1.3.2.2 bouyer evcnt_attach_dynamic(&sc->sc_intrcnt, EVCNT_TYPE_INTR, NULL, 102 1.3.2.2 bouyer "timer", "intr"); 103 1.3.2.2 bouyer 104 1.3.2.2 bouyer /* Setup RAMBO Timer to generate timer interrupts */ 105 1.3.2.2 bouyer sc->sc_hzticks = HZ_TO_TICKS(hz); 106 1.3.2.2 bouyer 107 1.3.2.2 bouyer sc->sc_tclast = 0; 108 1.3.2.2 bouyer bus_space_write_4(sc->sc_bst, sc->sc_bsh, RB_TCOUNT, 0); 109 1.3.2.2 bouyer bus_space_write_4(sc->sc_bst, sc->sc_bsh, RB_TBREAK, sc->sc_hzticks); 110 1.3.2.2 bouyer 111 1.3.2.2 bouyer bus_space_write_4(sc->sc_bst, sc->sc_bsh, RB_CTLREG, 112 1.3.2.2 bouyer RB_PARITY_EN | RB_BUZZOFF | RB_CLR_IOERR); 113 1.3.2.2 bouyer 114 1.3.2.2 bouyer printf(": parity enabled\n"); 115 1.3.2.2 bouyer rambo = sc; 116 1.3.2.2 bouyer platform.clkread = rambo_clkread; 117 1.3.2.2 bouyer } 118 1.3.2.2 bouyer 119 1.3.2.2 bouyer void 120 1.3.2.2 bouyer rambo_clkintr(cf) 121 1.3.2.2 bouyer struct clockframe *cf; 122 1.3.2.2 bouyer { 123 1.3.2.2 bouyer register u_int32_t tbreak, tcount; 124 1.3.2.2 bouyer register int delta; 125 1.3.2.2 bouyer 126 1.3.2.2 bouyer rambo->sc_intrcnt.ev_count++; 127 1.3.2.2 bouyer tbreak = bus_space_read_4(rambo->sc_bst, rambo->sc_bsh, RB_TBREAK); 128 1.3.2.2 bouyer tcount = bus_space_read_4(rambo->sc_bst, rambo->sc_bsh, RB_TCOUNT); 129 1.3.2.2 bouyer delta = tcount - tbreak; 130 1.3.2.2 bouyer 131 1.3.2.2 bouyer if (delta > (rambo->sc_hzticks>>1)) { 132 1.3.2.2 bouyer /* 133 1.3.2.2 bouyer * Either tcount may overtake the updated tbreak value 134 1.3.2.2 bouyer * or we have missed several interrupt's 135 1.3.2.2 bouyer */ 136 1.3.2.2 bouyer int cycles = 10 * hz; 137 1.3.2.2 bouyer while (cycles && tbreak < tcount) { 138 1.3.2.2 bouyer hardclock(cf); 139 1.3.2.2 bouyer rambo->sc_tclast = tbreak; 140 1.3.2.2 bouyer tbreak += rambo->sc_hzticks; 141 1.3.2.2 bouyer cycles--; 142 1.3.2.2 bouyer } 143 1.3.2.2 bouyer if (cycles == 0) { /* catchup failed - assume we are in sync */ 144 1.3.2.2 bouyer tcount = bus_space_read_4(rambo->sc_bst, 145 1.3.2.2 bouyer rambo->sc_bsh, RB_TCOUNT); 146 1.3.2.2 bouyer rambo->sc_tclast = tbreak = tcount; 147 1.3.2.2 bouyer } 148 1.3.2.2 bouyer } else { 149 1.3.2.2 bouyer hardclock(cf); 150 1.3.2.2 bouyer rambo->sc_tclast = tbreak; 151 1.3.2.2 bouyer } 152 1.3.2.2 bouyer 153 1.3.2.2 bouyer tbreak += rambo->sc_hzticks; 154 1.3.2.2 bouyer 155 1.3.2.2 bouyer bus_space_write_4(rambo->sc_bst, rambo->sc_bsh, RB_TBREAK, tbreak); 156 1.3.2.2 bouyer } 157 1.3.2.2 bouyer 158 1.3.2.2 bouyer /* 159 1.3.2.2 bouyer * Calculate the number of microseconds since the last clock tick 160 1.3.2.2 bouyer */ 161 1.3.2.2 bouyer static unsigned 162 1.3.2.2 bouyer rambo_clkread() 163 1.3.2.2 bouyer { 164 1.3.2.2 bouyer register u_int32_t tcount; 165 1.3.2.2 bouyer 166 1.3.2.2 bouyer tcount = bus_space_read_4(rambo->sc_bst, rambo->sc_bsh, RB_TCOUNT); 167 1.3.2.2 bouyer return TICKS_TO_USECS(tcount - rambo->sc_tclast); 168 1.3.2.2 bouyer } 169
Indexes created Wed Oct 22 13:09:56 GMT 2025