iomd_clock.c revision 1.2.4.2
1 1.2.4.2 nathanw /* $NetBSD: iomd_clock.c,v 1.2.4.2 2002/01/08 00:23:15 nathanw Exp $ */ 2 1.2.4.2 nathanw 3 1.2.4.2 nathanw /* 4 1.2.4.2 nathanw * Copyright (c) 1994-1997 Mark Brinicombe. 5 1.2.4.2 nathanw * Copyright (c) 1994 Brini. 6 1.2.4.2 nathanw * All rights reserved. 7 1.2.4.2 nathanw * 8 1.2.4.2 nathanw * This code is derived from software written for Brini by Mark Brinicombe 9 1.2.4.2 nathanw * 10 1.2.4.2 nathanw * Redistribution and use in source and binary forms, with or without 11 1.2.4.2 nathanw * modification, are permitted provided that the following conditions 12 1.2.4.2 nathanw * are met: 13 1.2.4.2 nathanw * 1. Redistributions of source code must retain the above copyright 14 1.2.4.2 nathanw * notice, this list of conditions and the following disclaimer. 15 1.2.4.2 nathanw * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.4.2 nathanw * notice, this list of conditions and the following disclaimer in the 17 1.2.4.2 nathanw * documentation and/or other materials provided with the distribution. 18 1.2.4.2 nathanw * 3. All advertising materials mentioning features or use of this software 19 1.2.4.2 nathanw * must display the following acknowledgement: 20 1.2.4.2 nathanw * This product includes software developed by Mark Brinicombe. 21 1.2.4.2 nathanw * 4. The name of the company nor the name of the author may be used to 22 1.2.4.2 nathanw * endorse or promote products derived from this software without specific 23 1.2.4.2 nathanw * prior written permission. 24 1.2.4.2 nathanw * 25 1.2.4.2 nathanw * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 26 1.2.4.2 nathanw * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 1.2.4.2 nathanw * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 1.2.4.2 nathanw * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 29 1.2.4.2 nathanw * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 30 1.2.4.2 nathanw * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 31 1.2.4.2 nathanw * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 1.2.4.2 nathanw * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 1.2.4.2 nathanw * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 1.2.4.2 nathanw * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 1.2.4.2 nathanw * SUCH DAMAGE. 36 1.2.4.2 nathanw * 37 1.2.4.2 nathanw * RiscBSD kernel project 38 1.2.4.2 nathanw * 39 1.2.4.2 nathanw * clock.c 40 1.2.4.2 nathanw * 41 1.2.4.2 nathanw * Timer related machine specific code 42 1.2.4.2 nathanw * 43 1.2.4.2 nathanw * Created : 29/09/94 44 1.2.4.2 nathanw */ 45 1.2.4.2 nathanw 46 1.2.4.2 nathanw /* Include header files */ 47 1.2.4.2 nathanw 48 1.2.4.2 nathanw #include <sys/types.h> 49 1.2.4.2 nathanw #include <sys/param.h> 50 1.2.4.2 nathanw #include <sys/systm.h> 51 1.2.4.2 nathanw #include <sys/kernel.h> 52 1.2.4.2 nathanw #include <sys/time.h> 53 1.2.4.2 nathanw #include <sys/device.h> 54 1.2.4.2 nathanw 55 1.2.4.2 nathanw #include <machine/intr.h> 56 1.2.4.2 nathanw 57 1.2.4.2 nathanw #include <arm/cpufunc.h> 58 1.2.4.2 nathanw 59 1.2.4.2 nathanw #include <arm/iomd/iomdvar.h> 60 1.2.4.2 nathanw #include <arm/iomd/iomdreg.h> 61 1.2.4.2 nathanw 62 1.2.4.2 nathanw struct clock_softc { 63 1.2.4.2 nathanw struct device sc_dev; 64 1.2.4.2 nathanw bus_space_tag_t sc_iot; 65 1.2.4.2 nathanw bus_space_handle_t sc_ioh; 66 1.2.4.2 nathanw }; 67 1.2.4.2 nathanw 68 1.2.4.2 nathanw #define TIMER_FREQUENCY 2000000 /* 2MHz clock */ 69 1.2.4.2 nathanw #define TICKS_PER_MICROSECOND (TIMER_FREQUENCY / 1000000) 70 1.2.4.2 nathanw 71 1.2.4.2 nathanw static void *clockirq; 72 1.2.4.2 nathanw static void *statclockirq; 73 1.2.4.2 nathanw static struct clock_softc *clock_sc; 74 1.2.4.2 nathanw static int timer0_count; 75 1.2.4.2 nathanw 76 1.2.4.2 nathanw static int clockmatch __P((struct device *parent, struct cfdata *cf, void *aux)); 77 1.2.4.2 nathanw static void clockattach __P((struct device *parent, struct device *self, void *aux)); 78 1.2.4.2 nathanw #ifdef DIAGNOSTIC 79 1.2.4.2 nathanw static void checkdelay __P((void)); 80 1.2.4.2 nathanw #endif 81 1.2.4.2 nathanw 82 1.2.4.2 nathanw struct cfattach clock_ca = { 83 1.2.4.2 nathanw sizeof(struct clock_softc), clockmatch, clockattach 84 1.2.4.2 nathanw }; 85 1.2.4.2 nathanw 86 1.2.4.2 nathanw /* 87 1.2.4.2 nathanw * int clockmatch(struct device *parent, void *match, void *aux) 88 1.2.4.2 nathanw * 89 1.2.4.2 nathanw * Just return ok for this if it is device 0 90 1.2.4.2 nathanw */ 91 1.2.4.2 nathanw 92 1.2.4.2 nathanw static int 93 1.2.4.2 nathanw clockmatch(parent, cf, aux) 94 1.2.4.2 nathanw struct device *parent; 95 1.2.4.2 nathanw struct cfdata *cf; 96 1.2.4.2 nathanw void *aux; 97 1.2.4.2 nathanw { 98 1.2.4.2 nathanw struct clk_attach_args *ca = aux; 99 1.2.4.2 nathanw 100 1.2.4.2 nathanw if (strcmp(ca->ca_name, "clk") == 0) 101 1.2.4.2 nathanw return(1); 102 1.2.4.2 nathanw return(0); 103 1.2.4.2 nathanw } 104 1.2.4.2 nathanw 105 1.2.4.2 nathanw 106 1.2.4.2 nathanw /* 107 1.2.4.2 nathanw * void clockattach(struct device *parent, struct device *dev, void *aux) 108 1.2.4.2 nathanw * 109 1.2.4.2 nathanw * Map the IOMD and identify it. 110 1.2.4.2 nathanw * Then configure the child devices based on the IOMD ID. 111 1.2.4.2 nathanw */ 112 1.2.4.2 nathanw 113 1.2.4.2 nathanw static void 114 1.2.4.2 nathanw clockattach(parent, self, aux) 115 1.2.4.2 nathanw struct device *parent; 116 1.2.4.2 nathanw struct device *self; 117 1.2.4.2 nathanw void *aux; 118 1.2.4.2 nathanw { 119 1.2.4.2 nathanw struct clock_softc *sc = (struct clock_softc *)self; 120 1.2.4.2 nathanw struct clk_attach_args *ca = aux; 121 1.2.4.2 nathanw 122 1.2.4.2 nathanw sc->sc_iot = ca->ca_iot; 123 1.2.4.2 nathanw sc->sc_ioh = ca->ca_ioh; /* This is a handle for the whole IOMD */ 124 1.2.4.2 nathanw 125 1.2.4.2 nathanw clock_sc = sc; 126 1.2.4.2 nathanw 127 1.2.4.2 nathanw /* Cannot do anything until cpu_initclocks() has been called */ 128 1.2.4.2 nathanw 129 1.2.4.2 nathanw printf("\n"); 130 1.2.4.2 nathanw } 131 1.2.4.2 nathanw 132 1.2.4.2 nathanw 133 1.2.4.2 nathanw /* 134 1.2.4.2 nathanw * int clockhandler(struct clockframe *frame) 135 1.2.4.2 nathanw * 136 1.2.4.2 nathanw * Function called by timer 0 interrupts. This just calls 137 1.2.4.2 nathanw * hardclock(). Eventually the irqhandler can call hardclock() directly 138 1.2.4.2 nathanw * but for now we use this function so that we can debug IRQ's 139 1.2.4.2 nathanw */ 140 1.2.4.2 nathanw 141 1.2.4.2 nathanw int 142 1.2.4.2 nathanw clockhandler(frame) 143 1.2.4.2 nathanw struct clockframe *frame; 144 1.2.4.2 nathanw { 145 1.2.4.2 nathanw hardclock(frame); 146 1.2.4.2 nathanw return(0); /* Pass the interrupt on down the chain */ 147 1.2.4.2 nathanw } 148 1.2.4.2 nathanw 149 1.2.4.2 nathanw 150 1.2.4.2 nathanw /* 151 1.2.4.2 nathanw * int statclockhandler(struct clockframe *frame) 152 1.2.4.2 nathanw * 153 1.2.4.2 nathanw * Function called by timer 1 interrupts. This just calls 154 1.2.4.2 nathanw * statclock(). Eventually the irqhandler can call statclock() directly 155 1.2.4.2 nathanw * but for now we use this function so that we can debug IRQ's 156 1.2.4.2 nathanw */ 157 1.2.4.2 nathanw 158 1.2.4.2 nathanw int 159 1.2.4.2 nathanw statclockhandler(frame) 160 1.2.4.2 nathanw struct clockframe *frame; 161 1.2.4.2 nathanw { 162 1.2.4.2 nathanw statclock(frame); 163 1.2.4.2 nathanw return(0); /* Pass the interrupt on down the chain */ 164 1.2.4.2 nathanw } 165 1.2.4.2 nathanw 166 1.2.4.2 nathanw 167 1.2.4.2 nathanw /* 168 1.2.4.2 nathanw * void setstatclockrate(int hz) 169 1.2.4.2 nathanw * 170 1.2.4.2 nathanw * Set the stat clock rate. The stat clock uses timer1 171 1.2.4.2 nathanw */ 172 1.2.4.2 nathanw 173 1.2.4.2 nathanw void 174 1.2.4.2 nathanw setstatclockrate(hz) 175 1.2.4.2 nathanw int hz; 176 1.2.4.2 nathanw { 177 1.2.4.2 nathanw int count; 178 1.2.4.2 nathanw 179 1.2.4.2 nathanw count = TIMER_FREQUENCY / hz; 180 1.2.4.2 nathanw 181 1.2.4.2 nathanw printf("Setting statclock to %dHz (%d ticks)\n", hz, count); 182 1.2.4.2 nathanw 183 1.2.4.2 nathanw bus_space_write_1(clock_sc->sc_iot, clock_sc->sc_ioh, 184 1.2.4.2 nathanw IOMD_T1LOW, (count >> 0) & 0xff); 185 1.2.4.2 nathanw bus_space_write_1(clock_sc->sc_iot, clock_sc->sc_ioh, 186 1.2.4.2 nathanw IOMD_T1HIGH, (count >> 8) & 0xff); 187 1.2.4.2 nathanw 188 1.2.4.2 nathanw /* reload the counter */ 189 1.2.4.2 nathanw 190 1.2.4.2 nathanw bus_space_write_1(clock_sc->sc_iot, clock_sc->sc_ioh, 191 1.2.4.2 nathanw IOMD_T1GO, 0); 192 1.2.4.2 nathanw } 193 1.2.4.2 nathanw 194 1.2.4.2 nathanw 195 1.2.4.2 nathanw #ifdef DIAGNOSTIC 196 1.2.4.2 nathanw static void 197 1.2.4.2 nathanw checkdelay() 198 1.2.4.2 nathanw { 199 1.2.4.2 nathanw struct timeval start, end, diff; 200 1.2.4.2 nathanw 201 1.2.4.2 nathanw microtime(&start); 202 1.2.4.2 nathanw delay(10000); 203 1.2.4.2 nathanw microtime(&end); 204 1.2.4.2 nathanw timersub(&end, &start, &diff); 205 1.2.4.2 nathanw if (diff.tv_sec > 0) 206 1.2.4.2 nathanw return; 207 1.2.4.2 nathanw if (diff.tv_usec > 10000) 208 1.2.4.2 nathanw return; 209 1.2.4.2 nathanw printf("WARNING: delay(10000) took %ld us\n", diff.tv_usec); 210 1.2.4.2 nathanw } 211 1.2.4.2 nathanw #endif 212 1.2.4.2 nathanw 213 1.2.4.2 nathanw /* 214 1.2.4.2 nathanw * void cpu_initclocks(void) 215 1.2.4.2 nathanw * 216 1.2.4.2 nathanw * Initialise the clocks. 217 1.2.4.2 nathanw * This sets up the two timers in the IOMD and installs the IRQ handlers 218 1.2.4.2 nathanw * 219 1.2.4.2 nathanw * NOTE: Currently only timer 0 is setup and the IRQ handler is not installed 220 1.2.4.2 nathanw */ 221 1.2.4.2 nathanw 222 1.2.4.2 nathanw void 223 1.2.4.2 nathanw cpu_initclocks() 224 1.2.4.2 nathanw { 225 1.2.4.2 nathanw /* 226 1.2.4.2 nathanw * Load timer 0 with count down value 227 1.2.4.2 nathanw * This timer generates 100Hz interrupts for the system clock 228 1.2.4.2 nathanw */ 229 1.2.4.2 nathanw 230 1.2.4.2 nathanw printf("clock: hz=%d stathz = %d profhz = %d\n", hz, stathz, profhz); 231 1.2.4.2 nathanw 232 1.2.4.2 nathanw timer0_count = TIMER_FREQUENCY / hz; 233 1.2.4.2 nathanw 234 1.2.4.2 nathanw bus_space_write_1(clock_sc->sc_iot, clock_sc->sc_ioh, 235 1.2.4.2 nathanw IOMD_T0LOW, (timer0_count >> 0) & 0xff); 236 1.2.4.2 nathanw bus_space_write_1(clock_sc->sc_iot, clock_sc->sc_ioh, 237 1.2.4.2 nathanw IOMD_T0HIGH, (timer0_count >> 8) & 0xff); 238 1.2.4.2 nathanw 239 1.2.4.2 nathanw /* reload the counter */ 240 1.2.4.2 nathanw 241 1.2.4.2 nathanw bus_space_write_1(clock_sc->sc_iot, clock_sc->sc_ioh, 242 1.2.4.2 nathanw IOMD_T0GO, 0); 243 1.2.4.2 nathanw 244 1.2.4.2 nathanw clockirq = intr_claim(IRQ_TIMER0, IPL_CLOCK, "tmr0 hard clk", 245 1.2.4.2 nathanw clockhandler, 0); 246 1.2.4.2 nathanw 247 1.2.4.2 nathanw if (clockirq == NULL) 248 1.2.4.2 nathanw panic("%s: Cannot installer timer 0 IRQ handler\n", 249 1.2.4.2 nathanw clock_sc->sc_dev.dv_xname); 250 1.2.4.2 nathanw 251 1.2.4.2 nathanw if (stathz) { 252 1.2.4.2 nathanw setstatclockrate(stathz); 253 1.2.4.2 nathanw statclockirq = intr_claim(IRQ_TIMER1, IPL_CLOCK, 254 1.2.4.2 nathanw "tmr1 stat clk", statclockhandler, 0); 255 1.2.4.2 nathanw if (statclockirq == NULL) 256 1.2.4.2 nathanw panic("%s: Cannot installer timer 1 IRQ handler\n", 257 1.2.4.2 nathanw clock_sc->sc_dev.dv_xname); 258 1.2.4.2 nathanw } 259 1.2.4.2 nathanw #ifdef DIAGNOSTIC 260 1.2.4.2 nathanw checkdelay(); 261 1.2.4.2 nathanw #endif 262 1.2.4.2 nathanw } 263 1.2.4.2 nathanw 264 1.2.4.2 nathanw 265 1.2.4.2 nathanw /* 266 1.2.4.2 nathanw * void microtime(struct timeval *tvp) 267 1.2.4.2 nathanw * 268 1.2.4.2 nathanw * Fill in the specified timeval struct with the current time 269 1.2.4.2 nathanw * accurate to the microsecond. 270 1.2.4.2 nathanw */ 271 1.2.4.2 nathanw 272 1.2.4.2 nathanw void 273 1.2.4.2 nathanw microtime(tvp) 274 1.2.4.2 nathanw struct timeval *tvp; 275 1.2.4.2 nathanw { 276 1.2.4.2 nathanw int s; 277 1.2.4.2 nathanw int tm; 278 1.2.4.2 nathanw int deltatm; 279 1.2.4.2 nathanw static struct timeval oldtv; 280 1.2.4.2 nathanw 281 1.2.4.2 nathanw if (timer0_count == 0) 282 1.2.4.2 nathanw return; 283 1.2.4.2 nathanw 284 1.2.4.2 nathanw s = splhigh(); 285 1.2.4.2 nathanw 286 1.2.4.2 nathanw /* 287 1.2.4.2 nathanw * Latch the current value of the timer and then read it. 288 1.2.4.2 nathanw * This garentees an atmoic reading of the time. 289 1.2.4.2 nathanw */ 290 1.2.4.2 nathanw 291 1.2.4.2 nathanw bus_space_write_1(clock_sc->sc_iot, clock_sc->sc_ioh, 292 1.2.4.2 nathanw IOMD_T0LATCH, 0); 293 1.2.4.2 nathanw 294 1.2.4.2 nathanw tm = bus_space_read_1(clock_sc->sc_iot, clock_sc->sc_ioh, 295 1.2.4.2 nathanw IOMD_T0LOW); 296 1.2.4.2 nathanw tm += (bus_space_read_1(clock_sc->sc_iot, clock_sc->sc_ioh, 297 1.2.4.2 nathanw IOMD_T0HIGH) << 8); 298 1.2.4.2 nathanw 299 1.2.4.2 nathanw deltatm = timer0_count - tm; 300 1.2.4.2 nathanw if (deltatm < 0) 301 1.2.4.2 nathanw printf("opps deltatm < 0 tm=%d deltatm=%d\n", 302 1.2.4.2 nathanw tm, deltatm); 303 1.2.4.2 nathanw 304 1.2.4.2 nathanw /* Fill in the timeval struct */ 305 1.2.4.2 nathanw *tvp = time; 306 1.2.4.2 nathanw 307 1.2.4.2 nathanw tvp->tv_usec += (deltatm / TICKS_PER_MICROSECOND); 308 1.2.4.2 nathanw 309 1.2.4.2 nathanw /* Make sure the micro seconds don't overflow. */ 310 1.2.4.2 nathanw while (tvp->tv_usec >= 1000000) { 311 1.2.4.2 nathanw tvp->tv_usec -= 1000000; 312 1.2.4.2 nathanw ++tvp->tv_sec; 313 1.2.4.2 nathanw } 314 1.2.4.2 nathanw 315 1.2.4.2 nathanw /* Make sure the time has advanced. */ 316 1.2.4.2 nathanw if (tvp->tv_sec == oldtv.tv_sec && 317 1.2.4.2 nathanw tvp->tv_usec <= oldtv.tv_usec) { 318 1.2.4.2 nathanw tvp->tv_usec = oldtv.tv_usec + 1; 319 1.2.4.2 nathanw if (tvp->tv_usec >= 1000000) { 320 1.2.4.2 nathanw tvp->tv_usec -= 1000000; 321 1.2.4.2 nathanw ++tvp->tv_sec; 322 1.2.4.2 nathanw } 323 1.2.4.2 nathanw } 324 1.2.4.2 nathanw 325 1.2.4.2 nathanw oldtv = *tvp; 326 1.2.4.2 nathanw (void)splx(s); 327 1.2.4.2 nathanw } 328 1.2.4.2 nathanw 329 1.2.4.2 nathanw /* 330 1.2.4.2 nathanw * Estimated loop for n microseconds 331 1.2.4.2 nathanw */ 332 1.2.4.2 nathanw 333 1.2.4.2 nathanw /* Need to re-write this to use the timers */ 334 1.2.4.2 nathanw 335 1.2.4.2 nathanw /* One day soon I will actually do this */ 336 1.2.4.2 nathanw 337 1.2.4.2 nathanw int delaycount = 100; 338 1.2.4.2 nathanw 339 1.2.4.2 nathanw void 340 1.2.4.2 nathanw delay(n) 341 1.2.4.2 nathanw u_int n; 342 1.2.4.2 nathanw { 343 1.2.4.2 nathanw u_int i; 344 1.2.4.2 nathanw 345 1.2.4.2 nathanw if (n == 0) return; 346 1.2.4.2 nathanw while (--n > 0) { 347 1.2.4.2 nathanw if (cputype == CPU_ID_SA110) /* XXX - Seriously gross hack */ 348 1.2.4.2 nathanw for (i = delaycount; --i;); 349 1.2.4.2 nathanw else 350 1.2.4.2 nathanw for (i = 8; --i;); 351 1.2.4.2 nathanw } 352 1.2.4.2 nathanw } 353 1.2.4.2 nathanw 354 1.2.4.2 nathanw /* End of iomd_clock.c */ 355
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