oclock.c revision 1.1
1/* $NetBSD: oclock.c,v 1.1 2002/03/28 11:54:17 pk Exp $ */ 2 3/*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Paul Kranenburg. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39/* 40 * sun4 intersil time-of-day clock driver. This chip also provides 41 * the system timer. 42 * 43 * Only 4/100's and 4/200's have this old clock device. 44 */ 45#include "opt_sparc_arch.h" 46 47#include <sys/param.h> 48#include <sys/kernel.h> 49#include <sys/device.h> 50#include <sys/systm.h> 51 52#include <machine/bus.h> 53#include <machine/autoconf.h> 54#include <machine/idprom.h> 55 56#include <dev/clock_subr.h> 57#include <dev/ic/intersil7170.h> 58 59/* Imported from clock.c: */ 60extern todr_chip_handle_t todr_handle; 61extern int oldclk; 62extern int timerblurb; 63extern void (*timer_init)(void); 64void establish_hostid(struct idprom *); 65 66 67static int oclockmatch(struct device *, struct cfdata *, void *); 68static void oclockattach(struct device *, struct device *, void *); 69 70struct cfattach oclock_ca = { 71 sizeof(struct device), oclockmatch, oclockattach 72}; 73 74 75#if defined(SUN4) 76static bus_space_tag_t i7_bt; 77static bus_space_handle_t i7_bh; 78 79#define intersil_command(run, interrupt) \ 80 (run | interrupt | INTERSIL_CMD_FREQ_32K | INTERSIL_CMD_24HR_MODE | \ 81 INTERSIL_CMD_NORMAL_MODE) 82 83#define intersil_disable() \ 84 bus_space_write_1(i7_bt, i7_bh, INTERSIL_ICMD, \ 85 intersil_command(INTERSIL_CMD_RUN, INTERSIL_CMD_IDISABLE)); 86 87#define intersil_enable() \ 88 bus_space_write_1(i7_bt, i7_bh, INTERSIL_ICMD, \ 89 intersil_command(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE)); 90 91#define intersil_clear() bus_space_read_1(i7_bt, i7_bh, INTERSIL_IINTR) 92 93int oclockintr(void *); 94static struct intrhand level10 = { oclockintr }; 95void oclock_init(void); 96#endif /* SUN4 */ 97 98/* 99 * old clock match routine 100 */ 101static int 102oclockmatch(parent, cf, aux) 103 struct device *parent; 104 struct cfdata *cf; 105 void *aux; 106{ 107 union obio_attach_args *uoba = aux; 108 struct obio4_attach_args *oba; 109 110 if (uoba->uoba_isobio4 == 0) 111 return (0); 112 113 /* Only these sun4s have oclock */ 114 if (!CPU_ISSUN4 || 115 (cpuinfo.cpu_type != CPUTYP_4_100 && 116 cpuinfo.cpu_type != CPUTYP_4_200)) 117 return (0); 118 119 /* Make sure there is something there */ 120 oba = &uoba->uoba_oba4; 121 return (bus_space_probe(oba->oba_bustag, oba->oba_paddr, 122 1, /* probe size */ 123 0, /* offset */ 124 0, /* flags */ 125 NULL, NULL)); 126} 127 128/* ARGSUSED */ 129static void 130oclockattach(parent, self, aux) 131 struct device *parent, *self; 132 void *aux; 133{ 134#if defined(SUN4) 135 union obio_attach_args *uoba = aux; 136 struct obio4_attach_args *oba = &uoba->uoba_oba4; 137 bus_space_tag_t bt = oba->oba_bustag; 138 bus_space_handle_t bh; 139 extern struct idprom sun4_idprom_store; 140 141 oldclk = 1; /* we've got an oldie! */ 142 143 if (bus_space_map(bt, 144 oba->oba_paddr, 145 sizeof(struct intersil7170), 146 BUS_SPACE_MAP_LINEAR, /* flags */ 147 &bh) != 0) { 148 printf("%s: can't map register\n", self->dv_xname); 149 return; 150 } 151 i7_bt = bt; 152 i7_bh = bh; 153 154 /* 155 * calibrate delay() 156 */ 157 ienab_bic(IE_L14 | IE_L10); /* disable all clock intrs */ 158 for (timerblurb = 1; ; timerblurb++) { 159 int ival; 160 161 /* Set to 1/100 second interval */ 162 bus_space_write_1(bt, bh, INTERSIL_IINTR, 163 INTERSIL_INTER_CSECONDS); 164 165 /* enable clock */ 166 intersil_enable(); 167 168 while ((intersil_clear() & INTERSIL_INTER_PENDING) == 0) 169 /* sync with interrupt */; 170 while ((intersil_clear() & INTERSIL_INTER_PENDING) == 0) 171 /* XXX: do it again, seems to need it */; 172 173 /* Probe 1/100 sec delay */ 174 delay(10000); 175 176 /* clear, save value */ 177 ival = intersil_clear(); 178 179 /* disable clock */ 180 intersil_disable(); 181 182 if ((ival & INTERSIL_INTER_PENDING) != 0) { 183 printf(" delay constant %d%s\n", timerblurb, 184 (timerblurb == 1) ? " [TOO SMALL?]" : ""); 185 break; 186 } 187 if (timerblurb > 10) { 188 printf("\noclock: calibration failing; clamped at %d\n", 189 timerblurb); 190 break; 191 } 192 } 193 194 timer_init = oclock_init; 195 196 /* link interrupt handler */ 197 intr_establish(10, &level10); 198 199 /* Our TOD clock year 0 represents 1968 */ 200 if ((todr_handle = intersil7170_attach(bt, bh, 1968)) == NULL) 201 panic("Can't attach tod clock"); 202 203 /* 204 * This has nothing to do with `oclock' but since on mostek 205 * TOD clock based machines the host ID is established when 206 * the clock attaches, we do it here as well. 207 */ 208 establish_hostid(&sun4_idprom_store); 209#endif /* SUN4 */ 210} 211 212#if defined(SUN4) 213/* 214 * Set up the real-time and statistics clocks. 215 * Leave stathz 0 only if no alternative timer is available. 216 * 217 * The frequencies of these clocks must be an even number of microseconds. 218 */ 219void 220oclock_init() 221{ 222 int dummy; 223 224 profhz = hz = 100; 225 tick = 1000000 / hz; 226 227 /* Select 1/100 second interval */ 228 bus_space_write_1(i7_bt, i7_bh, INTERSIL_IINTR, 229 INTERSIL_INTER_CSECONDS); 230 231 ienab_bic(IE_L14 | IE_L10); /* disable all clock intrs */ 232 intersil_disable(); /* disable clock */ 233 dummy = intersil_clear(); /* clear interrupts */ 234 ienab_bis(IE_L10); /* enable l10 interrupt */ 235 intersil_enable(); /* enable clock */ 236} 237 238/* 239 * Level 10 (clock) interrupts from system counter. 240 * If we are using the FORTH PROM for console input, we need to check 241 * for that here as well, and generate a software interrupt to read it. 242 */ 243int 244oclockintr(cap) 245 void *cap; 246{ 247 volatile int discard; 248 249 discard = intersil_clear(); 250 ienab_bic(IE_L10); /* clear interrupt */ 251 ienab_bis(IE_L10); /* enable interrupt */ 252 253 hardclock((struct clockframe *)cap); 254 return (1); 255} 256#endif /* SUN4 */ 257