Annotation of sys/arch/arm/sa11x0/sa11x0_ost.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: sa11x0_ost.c,v 1.7 2007/01/11 07:24:52 robert Exp $ */
! 2: /* $NetBSD: sa11x0_ost.c,v 1.11 2003/07/15 00:24:51 lukem Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1997 Mark Brinicombe.
! 6: * Copyright (c) 1997 Causality Limited.
! 7: * All rights reserved.
! 8: *
! 9: * This code is derived from software contributed to The NetBSD Foundation
! 10: * by IWAMOTO Toshihiro and Ichiro FUKUHARA.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: #include <sys/cdefs.h>
! 42: /*
! 43: __KERNEL_RCSID(0, "$NetBSD: sa11x0_ost.c,v 1.11 2003/07/15 00:24:51 lukem Exp $");
! 44: */
! 45:
! 46: #include <sys/types.h>
! 47: #include <sys/param.h>
! 48: #include <sys/systm.h>
! 49: #include <sys/kernel.h>
! 50: #include <sys/time.h>
! 51: #include <sys/device.h>
! 52:
! 53: #include <machine/bus.h>
! 54: #include <machine/intr.h>
! 55:
! 56: #include <arm/cpufunc.h>
! 57:
! 58: #include <arm/sa11x0/sa11x0_reg.h>
! 59: #include <arm/sa11x0/sa11x0_var.h>
! 60: #include <arm/sa11x0/sa11x0_ostreg.h>
! 61:
! 62: int saost_match(struct device *, void *, void *);
! 63: void saost_attach(struct device *, struct device *, void *);
! 64:
! 65: int gettick(void);
! 66: static int clockintr(void *);
! 67: static int statintr(void *);
! 68: void rtcinit(void);
! 69:
! 70: struct saost_softc {
! 71: struct device sc_dev;
! 72: bus_addr_t sc_baseaddr;
! 73: bus_space_tag_t sc_iot;
! 74: bus_space_handle_t sc_ioh;
! 75:
! 76: u_int32_t sc_clock_count;
! 77: u_int32_t sc_statclock_count;
! 78: u_int32_t sc_statclock_step;
! 79: };
! 80:
! 81: static struct saost_softc *saost_sc = NULL;
! 82:
! 83: #define DEF_TIMER_FREQUENCY 3686400 /* 3.6864MHz */
! 84: int saost_timer_freq =DEF_TIMER_FREQUENCY;
! 85: #define TIMER_FREQUENCY saost_timer_freq
! 86: #define TICKS_PER_MICROSECOND (TIMER_FREQUENCY/1000000)
! 87:
! 88: #ifndef STATHZ
! 89: #define STATHZ 64
! 90: #endif
! 91:
! 92: extern volatile struct timeval time;
! 93:
! 94: struct cfattach saost_ca = {
! 95: sizeof (struct saost_softc), saost_match, saost_attach
! 96: };
! 97:
! 98: struct cfdriver saost_cd = {
! 99: NULL, "saost", DV_DULL
! 100: };
! 101:
! 102: int
! 103: saost_match(parent, match, aux)
! 104: struct device *parent;
! 105: void *match;
! 106: void *aux;
! 107: {
! 108: if (saost_sc == NULL)
! 109: return (1);
! 110:
! 111: return (0);
! 112: }
! 113:
! 114: void
! 115: saost_attach(parent, self, aux)
! 116: struct device *parent;
! 117: struct device *self;
! 118: void *aux;
! 119: {
! 120: struct saost_softc *sc = (struct saost_softc*)self;
! 121: struct saip_attach_args *sa = aux;
! 122:
! 123: // printf("\n");
! 124:
! 125: sc->sc_iot = sa->sai_iot;
! 126: sc->sc_baseaddr = sa->sai_addr;
! 127:
! 128: saost_sc = sc;
! 129:
! 130: /* XXX */
! 131: if ((cputype & ~CPU_ID_XSCALE_COREREV_MASK) == CPU_ID_PXA27X)
! 132: TIMER_FREQUENCY = 3250000; /* XXX */
! 133:
! 134:
! 135: if(bus_space_map(sa->sai_iot, sa->sai_addr, sa->sai_size, 0,
! 136: &sc->sc_ioh))
! 137: panic("%s: Cannot map registers", self->dv_xname);
! 138:
! 139: /* disable all channel and clear interrupt status */
! 140: /* FIXME uvm_fault? */
! 141: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_IR, 0);
! 142: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_SR, 0xf);
! 143:
! 144: printf(": SA-11x0 OS Timer\n", sc->sc_dev.dv_xname);
! 145: }
! 146:
! 147: static int
! 148: clockintr(arg)
! 149: void *arg;
! 150: {
! 151: struct clockframe *frame = arg;
! 152: u_int32_t oscr, nextmatch, oldmatch;
! 153: int s;
! 154:
! 155: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 156: SAOST_SR, 1);
! 157:
! 158: /* schedule next clock intr */
! 159: oldmatch = saost_sc->sc_clock_count;
! 160: nextmatch = oldmatch + TIMER_FREQUENCY / hz;
! 161:
! 162: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR0,
! 163: nextmatch);
! 164: oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 165: SAOST_CR);
! 166:
! 167: if ((nextmatch > oldmatch &&
! 168: (oscr > nextmatch || oscr < oldmatch)) ||
! 169: (nextmatch < oldmatch && oscr > nextmatch && oscr < oldmatch)) {
! 170: /*
! 171: * we couldn't set the matching register in time.
! 172: * just set it to some value so that next interrupt happens.
! 173: * XXX is it possible to compansate lost interrupts?
! 174: */
! 175:
! 176: s = splhigh();
! 177: oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 178: SAOST_CR);
! 179: nextmatch = oscr + 10;
! 180: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 181: SAOST_MR0, nextmatch);
! 182: splx(s);
! 183: }
! 184:
! 185: saost_sc->sc_clock_count = nextmatch;
! 186: hardclock(frame);
! 187:
! 188: return(1);
! 189: }
! 190:
! 191: static int
! 192: statintr(arg)
! 193: void *arg;
! 194: {
! 195: struct clockframe *frame = arg;
! 196: u_int32_t oscr, nextmatch, oldmatch;
! 197: int s;
! 198:
! 199: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 200: SAOST_SR, 2);
! 201:
! 202: /* schedule next clock intr */
! 203: oldmatch = saost_sc->sc_statclock_count;
! 204: nextmatch = oldmatch + saost_sc->sc_statclock_step;
! 205:
! 206: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR1,
! 207: nextmatch);
! 208: oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 209: SAOST_CR);
! 210:
! 211: if ((nextmatch > oldmatch &&
! 212: (oscr > nextmatch || oscr < oldmatch)) ||
! 213: (nextmatch < oldmatch && oscr > nextmatch && oscr < oldmatch)) {
! 214: /*
! 215: * we couldn't set the matching register in time.
! 216: * just set it to some value so that next interrupt happens.
! 217: * XXX is it possible to compansate lost interrupts?
! 218: */
! 219:
! 220: s = splhigh();
! 221: oscr = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 222: SAOST_CR);
! 223: nextmatch = oscr + 10;
! 224: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 225: SAOST_MR1, nextmatch);
! 226: splx(s);
! 227: }
! 228:
! 229: saost_sc->sc_statclock_count = nextmatch;
! 230: statclock(frame);
! 231:
! 232: return(1);
! 233: }
! 234:
! 235:
! 236: void
! 237: setstatclockrate(hz)
! 238: int hz;
! 239: {
! 240: u_int32_t count;
! 241:
! 242: saost_sc->sc_statclock_step = TIMER_FREQUENCY / hz;
! 243: count = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_CR);
! 244: count += saost_sc->sc_statclock_step;
! 245: saost_sc->sc_statclock_count = count;
! 246: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 247: SAOST_MR1, count);
! 248: }
! 249:
! 250: void
! 251: cpu_initclocks()
! 252: {
! 253: stathz = STATHZ;
! 254: profhz = stathz;
! 255: saost_sc->sc_statclock_step = TIMER_FREQUENCY / stathz;
! 256:
! 257: /* Use the channels 0 and 1 for hardclock and statclock, respectively */
! 258: saost_sc->sc_clock_count = TIMER_FREQUENCY / hz;
! 259: saost_sc->sc_statclock_count = TIMER_FREQUENCY / stathz;
! 260:
! 261: sa11x0_intr_establish(0, 26, 1, IPL_CLOCK, clockintr, 0, "clock");
! 262: sa11x0_intr_establish(0, 27, 1, IPL_CLOCK, statintr, 0, "stat");
! 263:
! 264: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_SR, 0xf);
! 265: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_IR, 3);
! 266: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR0,
! 267: saost_sc->sc_clock_count);
! 268: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_MR1,
! 269: saost_sc->sc_statclock_count);
! 270:
! 271: /* Zero the counter value */
! 272: bus_space_write_4(saost_sc->sc_iot, saost_sc->sc_ioh, SAOST_CR, 0);
! 273: }
! 274:
! 275: int
! 276: gettick()
! 277: {
! 278: int counter;
! 279: u_int savedints;
! 280: savedints = disable_interrupts(I32_bit);
! 281:
! 282: counter = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 283: SAOST_CR);
! 284:
! 285: restore_interrupts(savedints);
! 286: return counter;
! 287: }
! 288:
! 289: void
! 290: microtime(tvp)
! 291: register struct timeval *tvp;
! 292: {
! 293: int s, tm, deltatm;
! 294: static struct timeval lasttime;
! 295:
! 296: if(saost_sc == NULL) {
! 297: tvp->tv_sec = 0;
! 298: tvp->tv_usec = 0;
! 299: return;
! 300: }
! 301:
! 302: s = splhigh();
! 303: tm = bus_space_read_4(saost_sc->sc_iot, saost_sc->sc_ioh,
! 304: SAOST_CR);
! 305:
! 306: deltatm = saost_sc->sc_clock_count - tm;
! 307:
! 308: #ifdef OST_DEBUG
! 309: printf("deltatm = %d\n",deltatm);
! 310: #endif
! 311:
! 312: *tvp = time;
! 313: tvp->tv_usec++; /* XXX */
! 314: while (tvp->tv_usec >= 1000000) {
! 315: tvp->tv_sec++;
! 316: tvp->tv_usec -= 1000000;
! 317: }
! 318:
! 319: if (tvp->tv_sec == lasttime.tv_sec &&
! 320: tvp->tv_usec <= lasttime.tv_usec &&
! 321: (tvp->tv_usec = lasttime.tv_usec + 1) >= 1000000)
! 322: {
! 323: tvp->tv_sec++;
! 324: tvp->tv_usec -= 1000000;
! 325: }
! 326: lasttime = *tvp;
! 327: splx(s);
! 328: }
! 329:
! 330: void
! 331: delay(usecs)
! 332: u_int usecs;
! 333: {
! 334: u_int32_t tick, otick, delta;
! 335: int j, csec, usec;
! 336:
! 337: csec = usecs / 10000;
! 338: usec = usecs % 10000;
! 339:
! 340: usecs = (TIMER_FREQUENCY / 100) * csec
! 341: + (TIMER_FREQUENCY / 100) * usec / 10000;
! 342:
! 343: if (! saost_sc) {
! 344: /* clock isn't initialized yet */
! 345: for(; usecs > 0; usecs--)
! 346: for(j = 100; j > 0; j--)
! 347: ;
! 348: return;
! 349: }
! 350:
! 351: otick = gettick();
! 352:
! 353: while (1) {
! 354: for(j = 100; j > 0; j--)
! 355: ;
! 356: tick = gettick();
! 357: delta = tick - otick;
! 358: if (delta > usecs)
! 359: break;
! 360: usecs -= delta;
! 361: otick = tick;
! 362: }
! 363: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to sa11x0_ost.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / arch / arm / sa11x0