acpi_hpet.c revision 203062
1151912Sphk/*- 2151912Sphk * Copyright (c) 2005 Poul-Henning Kamp 3151912Sphk * All rights reserved. 4151912Sphk * 5151912Sphk * Redistribution and use in source and binary forms, with or without 6151912Sphk * modification, are permitted provided that the following conditions 7151912Sphk * are met: 8151912Sphk * 1. Redistributions of source code must retain the above copyright 9151912Sphk * notice, this list of conditions and the following disclaimer. 10151912Sphk * 2. Redistributions in binary form must reproduce the above copyright 11151912Sphk * notice, this list of conditions and the following disclaimer in the 12151912Sphk * documentation and/or other materials provided with the distribution. 13151912Sphk * 14151912Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15151912Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16151912Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17151912Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18151912Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19151912Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20151912Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21151912Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22151912Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23151912Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24151912Sphk * SUCH DAMAGE. 25151912Sphk */ 26151912Sphk 27151912Sphk#include <sys/cdefs.h> 28151912Sphk__FBSDID("$FreeBSD: head/sys/dev/acpica/acpi_hpet.c 203062 2010-01-27 10:17:28Z avg $"); 29151912Sphk 30151912Sphk#include "opt_acpi.h" 31151912Sphk#include <sys/param.h> 32159217Snjl#include <sys/bus.h> 33151912Sphk#include <sys/kernel.h> 34151912Sphk#include <sys/module.h> 35151912Sphk#include <sys/rman.h> 36151912Sphk#include <sys/time.h> 37151912Sphk#include <sys/timetc.h> 38159217Snjl 39193530Sjkim#include <contrib/dev/acpica/include/acpi.h> 40193530Sjkim#include <contrib/dev/acpica/include/accommon.h> 41193530Sjkim 42151912Sphk#include <dev/acpica/acpivar.h> 43175385Sjhb#include <dev/acpica/acpi_hpet.h> 44151912Sphk 45203062Savg#define HPET_VENDID_AMD 0x4353 46203062Savg#define HPET_VENDID_INTEL 0x8086 47203062Savg 48151912SphkACPI_SERIAL_DECL(hpet, "ACPI HPET support"); 49151912Sphk 50169574Stakawatastatic devclass_t acpi_hpet_devclass; 51169574Stakawata 52151931Sscottl/* ACPI CA debugging */ 53151935Sscottl#define _COMPONENT ACPI_TIMER 54151931SscottlACPI_MODULE_NAME("HPET") 55151931Sscottl 56151912Sphkstruct acpi_hpet_softc { 57151912Sphk device_t dev; 58159217Snjl struct resource *mem_res; 59151912Sphk ACPI_HANDLE handle; 60151912Sphk}; 61151912Sphk 62159217Snjlstatic u_int hpet_get_timecount(struct timecounter *tc); 63159217Snjlstatic void acpi_hpet_test(struct acpi_hpet_softc *sc); 64151912Sphk 65159217Snjlstatic char *hpet_ids[] = { "PNP0103", NULL }; 66159217Snjl 67151912Sphkstruct timecounter hpet_timecounter = { 68151912Sphk .tc_get_timecount = hpet_get_timecount, 69151912Sphk .tc_counter_mask = ~0u, 70151912Sphk .tc_name = "HPET", 71171657Snjl .tc_quality = 900, 72151912Sphk}; 73151912Sphk 74159217Snjlstatic u_int 75151912Sphkhpet_get_timecount(struct timecounter *tc) 76151912Sphk{ 77151912Sphk struct acpi_hpet_softc *sc; 78151912Sphk 79151912Sphk sc = tc->tc_priv; 80175385Sjhb return (bus_read_4(sc->mem_res, HPET_MAIN_COUNTER)); 81151912Sphk} 82151912Sphk 83175361Sjhbstatic void 84175361Sjhbhpet_enable(struct acpi_hpet_softc *sc) 85175361Sjhb{ 86175361Sjhb uint32_t val; 87175385Sjhb 88175385Sjhb val = bus_read_4(sc->mem_res, HPET_CONFIG); 89185103Sjkim val &= ~HPET_CNF_LEG_RT; 90185103Sjkim val |= HPET_CNF_ENABLE; 91185103Sjkim bus_write_4(sc->mem_res, HPET_CONFIG, val); 92175361Sjhb} 93175361Sjhb 94175361Sjhbstatic void 95175361Sjhbhpet_disable(struct acpi_hpet_softc *sc) 96175361Sjhb{ 97175361Sjhb uint32_t val; 98175385Sjhb 99175385Sjhb val = bus_read_4(sc->mem_res, HPET_CONFIG); 100185103Sjkim val &= ~HPET_CNF_ENABLE; 101185103Sjkim bus_write_4(sc->mem_res, HPET_CONFIG, val); 102175361Sjhb} 103175361Sjhb 104169592Snjl/* Discover the HPET via the ACPI table of the same name. */ 105172489Snjlstatic void 106172489Snjlacpi_hpet_identify(driver_t *driver, device_t parent) 107169574Stakawata{ 108169574Stakawata ACPI_TABLE_HPET *hpet; 109169574Stakawata ACPI_TABLE_HEADER *hdr; 110169574Stakawata ACPI_STATUS status; 111169574Stakawata device_t child; 112169574Stakawata 113172489Snjl /* Only one HPET device can be added. */ 114172489Snjl if (devclass_get_device(acpi_hpet_devclass, 0)) 115172489Snjl return; 116172489Snjl 117169592Snjl /* Currently, ID and minimum clock tick info is unused. */ 118169574Stakawata 119169574Stakawata status = AcpiGetTable(ACPI_SIG_HPET, 1, (ACPI_TABLE_HEADER **)&hdr); 120169574Stakawata if (ACPI_FAILURE(status)) 121169574Stakawata return; 122169574Stakawata 123169592Snjl /* 124169592Snjl * The unit number could be derived from hdr->Sequence but we only 125169592Snjl * support one HPET device. 126169592Snjl */ 127169592Snjl hpet = (ACPI_TABLE_HPET *)hdr; 128169592Snjl if (hpet->Sequence != 0) 129169592Snjl printf("ACPI HPET table warning: Sequence is non-zero (%d)\n", 130169592Snjl hpet->Sequence); 131172489Snjl child = BUS_ADD_CHILD(parent, ACPI_DEV_BASE_ORDER, "acpi_hpet", 0); 132169574Stakawata if (child == NULL) { 133169574Stakawata printf("%s: can't add child\n", __func__); 134169574Stakawata return; 135169574Stakawata } 136169592Snjl 137169592Snjl bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address, 138169592Snjl HPET_MEM_WIDTH); 139169574Stakawata} 140169574Stakawata 141151912Sphkstatic int 142151912Sphkacpi_hpet_probe(device_t dev) 143151912Sphk{ 144159217Snjl ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 145159217Snjl 146169592Snjl if (acpi_disabled("hpet")) 147151912Sphk return (ENXIO); 148199016Savg if (acpi_get_handle(dev) != NULL && 149169592Snjl (ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL || 150169592Snjl device_get_unit(dev) != 0)) 151169592Snjl return (ENXIO); 152151912Sphk 153159217Snjl device_set_desc(dev, "High Precision Event Timer"); 154151912Sphk return (0); 155151912Sphk} 156151912Sphk 157151912Sphkstatic int 158151912Sphkacpi_hpet_attach(device_t dev) 159151912Sphk{ 160159217Snjl struct acpi_hpet_softc *sc; 161203062Savg int rid, num_timers; 162171547Snjl uint32_t val, val2; 163159217Snjl uintmax_t freq; 164203062Savg uint16_t vendor; 165151912Sphk 166151912Sphk ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 167151912Sphk 168151912Sphk sc = device_get_softc(dev); 169151912Sphk sc->dev = dev; 170151912Sphk sc->handle = acpi_get_handle(dev); 171151912Sphk 172159217Snjl rid = 0; 173159217Snjl sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 174159217Snjl RF_ACTIVE); 175159217Snjl if (sc->mem_res == NULL) 176159217Snjl return (ENOMEM); 177151912Sphk 178159217Snjl /* Validate that we can access the whole region. */ 179159217Snjl if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) { 180159217Snjl device_printf(dev, "memory region width %ld too small\n", 181159217Snjl rman_get_size(sc->mem_res)); 182159217Snjl bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 183159217Snjl return (ENXIO); 184159217Snjl } 185151912Sphk 186171547Snjl /* Be sure timer is enabled. */ 187175361Sjhb hpet_enable(sc); 188171547Snjl 189159217Snjl /* Read basic statistics about the timer. */ 190175385Sjhb val = bus_read_4(sc->mem_res, HPET_PERIOD); 191175361Sjhb if (val == 0) { 192175361Sjhb device_printf(dev, "invalid period\n"); 193175361Sjhb hpet_disable(sc); 194175361Sjhb bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 195175361Sjhb return (ENXIO); 196175361Sjhb } 197175361Sjhb 198159217Snjl freq = (1000000000000000LL + val / 2) / val; 199159217Snjl if (bootverbose) { 200175385Sjhb val = bus_read_4(sc->mem_res, HPET_CAPABILITIES); 201203062Savg 202203062Savg /* 203203062Savg * ATI/AMD violates IA-PC HPET (High Precision Event Timers) 204203062Savg * Specification and provides an off by one number 205203062Savg * of timers/comparators. 206203062Savg * Additionally, they use unregistered value in VENDOR_ID field. 207203062Savg */ 208203062Savg num_timers = 1 + ((val & HPET_CAP_NUM_TIM) >> 8); 209203062Savg vendor = val >> 16; 210203062Savg if (vendor == HPET_VENDID_AMD && num_timers > 0) 211203062Savg num_timers--; 212159217Snjl device_printf(dev, 213159217Snjl "vend: 0x%x rev: 0x%x num: %d hz: %jd opts:%s%s\n", 214203062Savg vendor, val & HPET_CAP_REV_ID, 215203062Savg num_timers, freq, 216175385Sjhb (val & HPET_CAP_LEG_RT) ? " legacy_route" : "", 217175385Sjhb (val & HPET_CAP_COUNT_SIZE) ? " 64-bit" : ""); 218159217Snjl } 219151912Sphk 220159217Snjl if (testenv("debug.acpi.hpet_test")) 221159217Snjl acpi_hpet_test(sc); 222151912Sphk 223171547Snjl /* 224171547Snjl * Don't attach if the timer never increments. Since the spec 225171547Snjl * requires it to be at least 10 MHz, it has to change in 1 us. 226171547Snjl */ 227175385Sjhb val = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 228171547Snjl DELAY(1); 229175385Sjhb val2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 230171547Snjl if (val == val2) { 231171547Snjl device_printf(dev, "HPET never increments, disabling\n"); 232175361Sjhb hpet_disable(sc); 233171547Snjl bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 234171547Snjl return (ENXIO); 235171547Snjl } 236171547Snjl 237159217Snjl hpet_timecounter.tc_frequency = freq; 238159217Snjl hpet_timecounter.tc_priv = sc; 239159217Snjl tc_init(&hpet_timecounter); 240159217Snjl 241159217Snjl return (0); 242159217Snjl} 243159217Snjl 244159217Snjlstatic int 245159217Snjlacpi_hpet_detach(device_t dev) 246159217Snjl{ 247159217Snjl ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 248159217Snjl 249159217Snjl /* XXX Without a tc_remove() function, we can't detach. */ 250159217Snjl return (EBUSY); 251159217Snjl} 252159217Snjl 253168010Snjlstatic int 254175361Sjhbacpi_hpet_suspend(device_t dev) 255175361Sjhb{ 256175361Sjhb struct acpi_hpet_softc *sc; 257175361Sjhb 258175361Sjhb /* 259175361Sjhb * Disable the timer during suspend. The timer will not lose 260175361Sjhb * its state in S1 or S2, but we are required to disable 261175361Sjhb * it. 262175361Sjhb */ 263175361Sjhb sc = device_get_softc(dev); 264175361Sjhb hpet_disable(sc); 265175361Sjhb 266175361Sjhb return (0); 267175361Sjhb} 268175361Sjhb 269175361Sjhbstatic int 270168010Snjlacpi_hpet_resume(device_t dev) 271168010Snjl{ 272168010Snjl struct acpi_hpet_softc *sc; 273168010Snjl 274168010Snjl /* Re-enable the timer after a resume to keep the clock advancing. */ 275168010Snjl sc = device_get_softc(dev); 276175361Sjhb hpet_enable(sc); 277168010Snjl 278168010Snjl return (0); 279168010Snjl} 280168010Snjl 281159217Snjl/* Print some basic latency/rate information to assist in debugging. */ 282159217Snjlstatic void 283159217Snjlacpi_hpet_test(struct acpi_hpet_softc *sc) 284159217Snjl{ 285151912Sphk int i; 286151912Sphk uint32_t u1, u2; 287151912Sphk struct bintime b0, b1, b2; 288151912Sphk struct timespec ts; 289151912Sphk 290151912Sphk binuptime(&b0); 291151912Sphk binuptime(&b0); 292151912Sphk binuptime(&b1); 293175385Sjhb u1 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 294151912Sphk for (i = 1; i < 1000; i++) 295175385Sjhb u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 296151912Sphk binuptime(&b2); 297175385Sjhb u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 298151912Sphk 299151912Sphk bintime_sub(&b2, &b1); 300151912Sphk bintime_sub(&b1, &b0); 301151912Sphk bintime_sub(&b2, &b1); 302151912Sphk bintime2timespec(&b2, &ts); 303151912Sphk 304159217Snjl device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n", 305151912Sphk (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1); 306151912Sphk 307159217Snjl device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000); 308151912Sphk} 309151912Sphk 310151912Sphkstatic device_method_t acpi_hpet_methods[] = { 311151912Sphk /* Device interface */ 312172489Snjl DEVMETHOD(device_identify, acpi_hpet_identify), 313151912Sphk DEVMETHOD(device_probe, acpi_hpet_probe), 314151912Sphk DEVMETHOD(device_attach, acpi_hpet_attach), 315151912Sphk DEVMETHOD(device_detach, acpi_hpet_detach), 316175361Sjhb DEVMETHOD(device_suspend, acpi_hpet_suspend), 317168010Snjl DEVMETHOD(device_resume, acpi_hpet_resume), 318151912Sphk 319151912Sphk {0, 0} 320151912Sphk}; 321151912Sphk 322151912Sphkstatic driver_t acpi_hpet_driver = { 323151912Sphk "acpi_hpet", 324151912Sphk acpi_hpet_methods, 325151912Sphk sizeof(struct acpi_hpet_softc), 326151912Sphk}; 327151912Sphk 328151912Sphk 329151912SphkDRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, 0, 0); 330151912SphkMODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1); 331