a9tmr.c revision 1.3.2.2
1 1.3.2.2 yamt /* $NetBSD: a9tmr.c,v 1.3.2.2 2012/10/30 17:19:00 yamt Exp $ */ 2 1.3.2.2 yamt 3 1.3.2.2 yamt /*- 4 1.3.2.2 yamt * Copyright (c) 2012 The NetBSD Foundation, Inc. 5 1.3.2.2 yamt * All rights reserved. 6 1.3.2.2 yamt * 7 1.3.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 yamt * by Matt Thomas 9 1.3.2.2 yamt * 10 1.3.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 yamt * modification, are permitted provided that the following conditions 12 1.3.2.2 yamt * are met: 13 1.3.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.3.2.2 yamt * 19 1.3.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.3.2.2 yamt */ 31 1.3.2.2 yamt 32 1.3.2.2 yamt #include <sys/cdefs.h> 33 1.3.2.2 yamt __KERNEL_RCSID(0, "$NetBSD: a9tmr.c,v 1.3.2.2 2012/10/30 17:19:00 yamt Exp $"); 34 1.3.2.2 yamt 35 1.3.2.2 yamt #include <sys/param.h> 36 1.3.2.2 yamt #include <sys/bus.h> 37 1.3.2.2 yamt #include <sys/device.h> 38 1.3.2.2 yamt #include <sys/intr.h> 39 1.3.2.2 yamt #include <sys/kernel.h> 40 1.3.2.2 yamt #include <sys/proc.h> 41 1.3.2.2 yamt #include <sys/systm.h> 42 1.3.2.2 yamt #include <sys/timetc.h> 43 1.3.2.2 yamt 44 1.3.2.2 yamt #include <prop/proplib.h> 45 1.3.2.2 yamt 46 1.3.2.2 yamt #include <arm/cortex/a9tmr_reg.h> 47 1.3.2.2 yamt #include <arm/cortex/a9tmr_var.h> 48 1.3.2.2 yamt 49 1.3.2.2 yamt #include <arm/cortex/mpcore_var.h> 50 1.3.2.2 yamt 51 1.3.2.2 yamt static int a9tmr_match(device_t, cfdata_t, void *); 52 1.3.2.2 yamt static void a9tmr_attach(device_t, device_t, void *); 53 1.3.2.2 yamt 54 1.3.2.2 yamt static int clockhandler(void *); 55 1.3.2.2 yamt 56 1.3.2.2 yamt static u_int a9tmr_get_timecount(struct timecounter *); 57 1.3.2.2 yamt 58 1.3.2.2 yamt static struct a9tmr_softc a9tmr_sc; 59 1.3.2.2 yamt 60 1.3.2.2 yamt static struct timecounter a9tmr_timecounter = { 61 1.3.2.2 yamt .tc_get_timecount = a9tmr_get_timecount, 62 1.3.2.2 yamt .tc_poll_pps = 0, 63 1.3.2.2 yamt .tc_counter_mask = ~0u, 64 1.3.2.2 yamt .tc_frequency = 0, /* set by cpu_initclocks() */ 65 1.3.2.2 yamt .tc_name = NULL, /* set by attach */ 66 1.3.2.2 yamt .tc_quality = 500, 67 1.3.2.2 yamt .tc_priv = &a9tmr_sc, 68 1.3.2.2 yamt .tc_next = NULL, 69 1.3.2.2 yamt }; 70 1.3.2.2 yamt 71 1.3.2.2 yamt CFATTACH_DECL_NEW(a9tmr, 0, a9tmr_match, a9tmr_attach, NULL, NULL); 72 1.3.2.2 yamt 73 1.3.2.2 yamt static inline uint32_t 74 1.3.2.2 yamt a9tmr_global_read(struct a9tmr_softc *sc, bus_size_t o) 75 1.3.2.2 yamt { 76 1.3.2.2 yamt return bus_space_read_4(sc->sc_memt, sc->sc_global_memh, o); 77 1.3.2.2 yamt } 78 1.3.2.2 yamt 79 1.3.2.2 yamt static inline void 80 1.3.2.2 yamt a9tmr_global_write(struct a9tmr_softc *sc, bus_size_t o, uint32_t v) 81 1.3.2.2 yamt { 82 1.3.2.2 yamt bus_space_write_4(sc->sc_memt, sc->sc_global_memh, o, v); 83 1.3.2.2 yamt } 84 1.3.2.2 yamt 85 1.3.2.2 yamt 86 1.3.2.2 yamt /* ARGSUSED */ 87 1.3.2.2 yamt static int 88 1.3.2.2 yamt a9tmr_match(device_t parent, cfdata_t cf, void *aux) 89 1.3.2.2 yamt { 90 1.3.2.2 yamt struct mpcore_attach_args * const mpcaa = aux; 91 1.3.2.2 yamt 92 1.3.2.2 yamt if (a9tmr_sc.sc_dev != NULL) 93 1.3.2.2 yamt return 0; 94 1.3.2.2 yamt 95 1.3.2.2 yamt if (!CPU_ID_CORTEX_A9_P(curcpu()->ci_arm_cpuid)) 96 1.3.2.2 yamt return 0; 97 1.3.2.2 yamt 98 1.3.2.2 yamt if (strcmp(mpcaa->mpcaa_name, cf->cf_name) != 0) 99 1.3.2.2 yamt return 0; 100 1.3.2.2 yamt 101 1.3.2.2 yamt /* 102 1.3.2.2 yamt * This isn't present on UP A9s (since CBAR isn't present). 103 1.3.2.2 yamt */ 104 1.3.2.2 yamt uint32_t mpidr = armreg_mpidr_read(); 105 1.3.2.2 yamt if (mpidr == 0 || (mpidr & MPIDR_U)) 106 1.3.2.2 yamt return 0; 107 1.3.2.2 yamt 108 1.3.2.2 yamt return 1; 109 1.3.2.2 yamt } 110 1.3.2.2 yamt 111 1.3.2.2 yamt static void 112 1.3.2.2 yamt a9tmr_attach(device_t parent, device_t self, void *aux) 113 1.3.2.2 yamt { 114 1.3.2.2 yamt struct a9tmr_softc *sc = &a9tmr_sc; 115 1.3.2.2 yamt struct mpcore_attach_args * const mpcaa = aux; 116 1.3.2.2 yamt prop_dictionary_t dict = device_properties(self); 117 1.3.2.2 yamt char freqbuf[sizeof("XXX SHz")]; 118 1.3.2.2 yamt 119 1.3.2.2 yamt /* 120 1.3.2.2 yamt * This runs at the ARM PERIPHCLOCK which should be 1/2 of the CPU clock. 121 1.3.2.2 yamt * The MD code should have setup our frequency for us. 122 1.3.2.2 yamt */ 123 1.3.2.2 yamt prop_number_t pn = prop_dictionary_get(dict, "frequency"); 124 1.3.2.2 yamt KASSERT(pn != NULL); 125 1.3.2.2 yamt sc->sc_freq = prop_number_unsigned_integer_value(pn); 126 1.3.2.2 yamt 127 1.3.2.2 yamt humanize_number(freqbuf, sizeof(freqbuf), sc->sc_freq, "Hz", 1000); 128 1.3.2.2 yamt 129 1.3.2.2 yamt aprint_naive("\n"); 130 1.3.2.2 yamt aprint_normal(": A9 Global 64-bit Timer (%s)\n", freqbuf); 131 1.3.2.2 yamt 132 1.3.2.2 yamt self->dv_private = sc; 133 1.3.2.2 yamt sc->sc_dev = self; 134 1.3.2.2 yamt sc->sc_memt = mpcaa->mpcaa_memt; 135 1.3.2.2 yamt sc->sc_memh = mpcaa->mpcaa_memh; 136 1.3.2.2 yamt 137 1.3.2.2 yamt evcnt_attach_dynamic(&sc->sc_ev_missing_ticks, EVCNT_TYPE_MISC, NULL, 138 1.3.2.2 yamt device_xname(self), "missing interrupts"); 139 1.3.2.2 yamt 140 1.3.2.2 yamt bus_space_subregion(sc->sc_memt, sc->sc_memh, 141 1.3.2.2 yamt TMR_GLOBAL_BASE, TMR_GLOBAL_BASE, &sc->sc_global_memh); 142 1.3.2.2 yamt bus_space_subregion(sc->sc_memt, sc->sc_memh, 143 1.3.2.2 yamt TMR_PRIVATE_BASE, TMR_PRIVATE_SIZE, &sc->sc_private_memh); 144 1.3.2.2 yamt bus_space_subregion(sc->sc_memt, sc->sc_memh, 145 1.3.2.2 yamt TMR_WDOG_BASE, TMR_WDOG_SIZE, &sc->sc_wdog_memh); 146 1.3.2.2 yamt 147 1.3.2.2 yamt sc->sc_global_ih = intr_establish(IRQ_A9TMR_PPI_GTIMER, IPL_CLOCK, 148 1.3.2.2 yamt IST_EDGE, clockhandler, NULL); 149 1.3.2.2 yamt if (sc->sc_global_ih == NULL) 150 1.3.2.2 yamt panic("%s: unable to register timer interrupt", __func__); 151 1.3.2.2 yamt aprint_normal_dev(sc->sc_dev, "interrupting on irq %d\n", 152 1.3.2.2 yamt IRQ_A9TMR_PPI_GTIMER); 153 1.3.2.2 yamt } 154 1.3.2.2 yamt 155 1.3.2.2 yamt static inline uint64_t 156 1.3.2.2 yamt a9tmr_gettime(struct a9tmr_softc *sc) 157 1.3.2.2 yamt { 158 1.3.2.2 yamt uint32_t lo, hi; 159 1.3.2.2 yamt 160 1.3.2.2 yamt do { 161 1.3.2.2 yamt hi = a9tmr_global_read(sc, TMR_GBL_CTR_U); 162 1.3.2.2 yamt lo = a9tmr_global_read(sc, TMR_GBL_CTR_L); 163 1.3.2.2 yamt } while (hi != a9tmr_global_read(sc, TMR_GBL_CTR_U)); 164 1.3.2.2 yamt 165 1.3.2.2 yamt return ((uint64_t)hi << 32) | lo; 166 1.3.2.2 yamt } 167 1.3.2.2 yamt 168 1.3.2.2 yamt void 169 1.3.2.2 yamt a9tmr_init_cpu_clock(struct cpu_info *ci) 170 1.3.2.2 yamt { 171 1.3.2.2 yamt struct a9tmr_softc * const sc = &a9tmr_sc; 172 1.3.2.2 yamt uint64_t now = a9tmr_gettime(sc); 173 1.3.2.2 yamt 174 1.3.2.2 yamt KASSERT(ci == curcpu()); 175 1.3.2.2 yamt 176 1.3.2.2 yamt ci->ci_lastintr = now; 177 1.3.2.2 yamt 178 1.3.2.2 yamt a9tmr_global_write(sc, TMR_GBL_AUTOINC, sc->sc_autoinc); 179 1.3.2.2 yamt 180 1.3.2.2 yamt /* 181 1.3.2.2 yamt * To update the compare register we have to disable comparisions first. 182 1.3.2.2 yamt */ 183 1.3.2.2 yamt uint32_t ctl = a9tmr_global_read(sc, TMR_GBL_CTL); 184 1.3.2.2 yamt if (ctl & TMR_GBL_CTL_CMP_ENABLE) { 185 1.3.2.2 yamt a9tmr_global_write(sc, TMR_GBL_CTL, ctl & ~TMR_GBL_CTL_CMP_ENABLE); 186 1.3.2.2 yamt } 187 1.3.2.2 yamt 188 1.3.2.2 yamt /* 189 1.3.2.2 yamt * Schedule the next interrupt. 190 1.3.2.2 yamt */ 191 1.3.2.2 yamt now += sc->sc_autoinc; 192 1.3.2.2 yamt a9tmr_global_write(sc, TMR_GBL_CMP_L, (uint32_t) now); 193 1.3.2.2 yamt a9tmr_global_write(sc, TMR_GBL_CMP_H, (uint32_t) (now >> 32)); 194 1.3.2.2 yamt 195 1.3.2.2 yamt /* 196 1.3.2.2 yamt * Re-enable the comparator and now enable interrupts. 197 1.3.2.2 yamt */ 198 1.3.2.2 yamt a9tmr_global_write(sc, TMR_GBL_INT, 1); /* clear interrupt pending */ 199 1.3.2.2 yamt ctl |= TMR_GBL_CTL_CMP_ENABLE | TMR_GBL_CTL_INT_ENABLE | TMR_GBL_CTL_AUTO_INC; 200 1.3.2.2 yamt a9tmr_global_write(sc, TMR_GBL_CTL, ctl); 201 1.3.2.2 yamt #if 0 202 1.3.2.2 yamt printf("%s: %s: ctl %#x autoinc %u cmp %#x%08x now %#"PRIx64"\n", 203 1.3.2.2 yamt __func__, ci->ci_data.cpu_name, 204 1.3.2.2 yamt a9tmr_global_read(sc, TMR_GBL_CTL), 205 1.3.2.2 yamt a9tmr_global_read(sc, TMR_GBL_AUTOINC), 206 1.3.2.2 yamt a9tmr_global_read(sc, TMR_GBL_CMP_H), 207 1.3.2.2 yamt a9tmr_global_read(sc, TMR_GBL_CMP_L), 208 1.3.2.2 yamt a9tmr_gettime(sc)); 209 1.3.2.2 yamt 210 1.3.2.2 yamt int s = splsched(); 211 1.3.2.2 yamt uint64_t when = now; 212 1.3.2.2 yamt u_int n = 0; 213 1.3.2.2 yamt while ((now = a9tmr_gettime(sc)) < when) { 214 1.3.2.2 yamt /* spin */ 215 1.3.2.2 yamt n++; 216 1.3.2.2 yamt KASSERTMSG(n <= sc->sc_autoinc, 217 1.3.2.2 yamt "spun %u times but only %"PRIu64" has passed", 218 1.3.2.2 yamt n, when - now); 219 1.3.2.2 yamt } 220 1.3.2.2 yamt printf("%s: %s: status %#x cmp %#x%08x now %#"PRIx64"\n", 221 1.3.2.2 yamt __func__, ci->ci_data.cpu_name, 222 1.3.2.2 yamt a9tmr_global_read(sc, TMR_GBL_INT), 223 1.3.2.2 yamt a9tmr_global_read(sc, TMR_GBL_CMP_H), 224 1.3.2.2 yamt a9tmr_global_read(sc, TMR_GBL_CMP_L), 225 1.3.2.2 yamt a9tmr_gettime(sc)); 226 1.3.2.2 yamt splx(s); 227 1.3.2.2 yamt #elif 0 228 1.3.2.2 yamt delay(1000000 / hz + 1000); 229 1.3.2.2 yamt #endif 230 1.3.2.2 yamt } 231 1.3.2.2 yamt 232 1.3.2.2 yamt void 233 1.3.2.2 yamt cpu_initclocks(void) 234 1.3.2.2 yamt { 235 1.3.2.2 yamt struct a9tmr_softc * const sc = &a9tmr_sc; 236 1.3.2.2 yamt 237 1.3.2.2 yamt KASSERT(sc->sc_dev != NULL); 238 1.3.2.2 yamt KASSERT(sc->sc_freq != 0); 239 1.3.2.2 yamt 240 1.3.2.2 yamt sc->sc_autoinc = sc->sc_freq / hz; 241 1.3.2.2 yamt 242 1.3.2.2 yamt a9tmr_init_cpu_clock(curcpu()); 243 1.3.2.2 yamt 244 1.3.2.2 yamt a9tmr_timecounter.tc_name = device_xname(sc->sc_dev); 245 1.3.2.2 yamt a9tmr_timecounter.tc_frequency = sc->sc_freq; 246 1.3.2.2 yamt 247 1.3.2.2 yamt tc_init(&a9tmr_timecounter); 248 1.3.2.2 yamt } 249 1.3.2.2 yamt 250 1.3.2.2 yamt void 251 1.3.2.2 yamt a9tmr_delay(unsigned int n) 252 1.3.2.2 yamt { 253 1.3.2.2 yamt struct a9tmr_softc * const sc = &a9tmr_sc; 254 1.3.2.2 yamt 255 1.3.2.2 yamt KASSERT(sc != NULL); 256 1.3.2.2 yamt 257 1.3.2.2 yamt uint32_t freq = sc->sc_freq ? sc->sc_freq : curcpu()->ci_data.cpu_cc_freq / 2; 258 1.3.2.2 yamt KASSERT(freq != 0); 259 1.3.2.2 yamt 260 1.3.2.2 yamt /* 261 1.3.2.2 yamt * not quite divide by 1000000 but close enough 262 1.3.2.2 yamt * (higher by 1.3% which means we wait 1.3% longer). 263 1.3.2.2 yamt */ 264 1.3.2.2 yamt const uint64_t incr_per_us = (freq >> 20) + (freq >> 24); 265 1.3.2.2 yamt 266 1.3.2.2 yamt const uint64_t delta = n * incr_per_us; 267 1.3.2.2 yamt const uint64_t base = a9tmr_gettime(sc); 268 1.3.2.2 yamt const uint64_t finish = base + delta; 269 1.3.2.2 yamt 270 1.3.2.2 yamt while (a9tmr_gettime(sc) < finish) { 271 1.3.2.2 yamt /* spin */ 272 1.3.2.2 yamt } 273 1.3.2.2 yamt } 274 1.3.2.2 yamt 275 1.3.2.2 yamt /* 276 1.3.2.2 yamt * clockhandler: 277 1.3.2.2 yamt * 278 1.3.2.2 yamt * Handle the hardclock interrupt. 279 1.3.2.2 yamt */ 280 1.3.2.2 yamt static int 281 1.3.2.2 yamt clockhandler(void *arg) 282 1.3.2.2 yamt { 283 1.3.2.2 yamt struct clockframe * const cf = arg; 284 1.3.2.2 yamt struct a9tmr_softc * const sc = &a9tmr_sc; 285 1.3.2.2 yamt struct cpu_info * const ci = curcpu(); 286 1.3.2.2 yamt 287 1.3.2.2 yamt const uint64_t now = a9tmr_gettime(sc); 288 1.3.2.2 yamt uint64_t delta = now - ci->ci_lastintr; 289 1.3.2.2 yamt 290 1.3.2.2 yamt a9tmr_global_write(sc, TMR_GBL_INT, 1); // Ack the interrupt 291 1.3.2.2 yamt 292 1.3.2.2 yamt #if 0 293 1.3.2.2 yamt printf("%s(%p): %s: now %#"PRIx64" delta %"PRIu64"\n", 294 1.3.2.2 yamt __func__, cf, ci->ci_data.cpu_name, now, delta); 295 1.3.2.2 yamt #endif 296 1.3.2.2 yamt KASSERTMSG(delta > sc->sc_autoinc / 100, 297 1.3.2.2 yamt "%s: interrupting too quickly (delta=%"PRIu64")", 298 1.3.2.2 yamt ci->ci_data.cpu_name, delta); 299 1.3.2.2 yamt 300 1.3.2.2 yamt ci->ci_lastintr = now; 301 1.3.2.2 yamt 302 1.3.2.2 yamt hardclock(cf); 303 1.3.2.2 yamt 304 1.3.2.2 yamt #if 0 305 1.3.2.2 yamt /* 306 1.3.2.2 yamt * Try to make up up to a seconds amount of missed clock interrupts 307 1.3.2.2 yamt */ 308 1.3.2.2 yamt u_int ticks = hz; 309 1.3.2.2 yamt for (delta -= sc->sc_autoinc; 310 1.3.2.2 yamt ticks > 0 && delta >= sc->sc_autoinc; 311 1.3.2.2 yamt delta -= sc->sc_autoinc, ticks--) { 312 1.3.2.2 yamt hardclock(cf); 313 1.3.2.2 yamt } 314 1.3.2.2 yamt #else 315 1.3.2.2 yamt if (delta > sc->sc_autoinc) 316 1.3.2.2 yamt sc->sc_ev_missing_ticks.ev_count += delta / sc->sc_autoinc; 317 1.3.2.2 yamt #endif 318 1.3.2.2 yamt 319 1.3.2.2 yamt return 1; 320 1.3.2.2 yamt } 321 1.3.2.2 yamt 322 1.3.2.2 yamt void 323 1.3.2.2 yamt setstatclockrate(int newhz) 324 1.3.2.2 yamt { 325 1.3.2.2 yamt } 326 1.3.2.2 yamt 327 1.3.2.2 yamt static u_int 328 1.3.2.2 yamt a9tmr_get_timecount(struct timecounter *tc) 329 1.3.2.2 yamt { 330 1.3.2.2 yamt struct a9tmr_softc * const sc = tc->tc_priv; 331 1.3.2.2 yamt 332 1.3.2.2 yamt return (u_int) (a9tmr_gettime(sc)); 333 1.3.2.2 yamt } 334
Indexes created Tue Sep 30 20:09:53 GMT 2025