369 lines
10 KiB
C
369 lines
10 KiB
C
/*-
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* Copyright (c) 2000, 2001 Michael Smith
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* Copyright (c) 2000 BSDi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_acpi.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <sys/timetc.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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#include "acpi.h"
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#include <dev/acpica/acpivar.h>
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#include <dev/pci/pcivar.h>
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/*
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* A timecounter based on the free-running ACPI timer.
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*
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* Based on the i386-only mp_clock.c by <phk@FreeBSD.ORG>.
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*/
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/* Hooks for the ACPI CA debugging infrastructure */
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#define _COMPONENT ACPI_TIMER
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ACPI_MODULE_NAME("TIMER")
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static device_t acpi_timer_dev;
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static struct resource *acpi_timer_reg;
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static bus_space_handle_t acpi_timer_bsh;
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static bus_space_tag_t acpi_timer_bst;
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static u_int acpi_timer_frequency = 14318182 / 4;
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static void acpi_timer_identify(driver_t *driver, device_t parent);
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static int acpi_timer_probe(device_t dev);
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static int acpi_timer_attach(device_t dev);
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static u_int acpi_timer_get_timecount(struct timecounter *tc);
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static u_int acpi_timer_get_timecount_safe(struct timecounter *tc);
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static int acpi_timer_sysctl_freq(SYSCTL_HANDLER_ARGS);
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static void acpi_timer_boot_test(void);
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static u_int acpi_timer_read(void);
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static int acpi_timer_test(void);
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static device_method_t acpi_timer_methods[] = {
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DEVMETHOD(device_identify, acpi_timer_identify),
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DEVMETHOD(device_probe, acpi_timer_probe),
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DEVMETHOD(device_attach, acpi_timer_attach),
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{0, 0}
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};
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static driver_t acpi_timer_driver = {
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"acpi_timer",
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acpi_timer_methods,
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0,
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};
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static devclass_t acpi_timer_devclass;
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DRIVER_MODULE(acpi_timer, acpi, acpi_timer_driver, acpi_timer_devclass, 0, 0);
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MODULE_DEPEND(acpi_timer, acpi, 1, 1, 1);
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static struct timecounter acpi_timer_timecounter = {
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acpi_timer_get_timecount_safe, /* get_timecount function */
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0, /* no poll_pps */
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0, /* no default counter_mask */
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0, /* no default frequency */
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"ACPI", /* name */
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1000 /* quality */
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};
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static u_int
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acpi_timer_read()
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{
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return (bus_space_read_4(acpi_timer_bst, acpi_timer_bsh, 0));
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}
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/*
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* Locate the ACPI timer using the FADT, set up and allocate the I/O resources
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* we will be using.
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*/
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static void
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acpi_timer_identify(driver_t *driver, device_t parent)
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{
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device_t dev;
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u_long rlen, rstart;
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int rid, rtype;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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if (acpi_disabled("timer") || (acpi_quirks & ACPI_Q_TIMER) ||
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AcpiGbl_FADT == NULL || acpi_timer_dev)
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return_VOID;
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if ((dev = BUS_ADD_CHILD(parent, 0, "acpi_timer", 0)) == NULL) {
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device_printf(parent, "could not add acpi_timer0\n");
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return_VOID;
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}
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acpi_timer_dev = dev;
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rid = 0;
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rtype = AcpiGbl_FADT->XPmTmrBlk.AddressSpaceId ?
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SYS_RES_IOPORT : SYS_RES_MEMORY;
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rlen = AcpiGbl_FADT->PmTmLen;
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rstart = AcpiGbl_FADT->XPmTmrBlk.Address;
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if (bus_set_resource(dev, rtype, rid, rstart, rlen))
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device_printf(dev, "couldn't set resource (%s 0x%lx+0x%lx)\n",
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(rtype == SYS_RES_IOPORT) ? "port" : "mem", rstart, rlen);
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return_VOID;
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}
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static int
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acpi_timer_probe(device_t dev)
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{
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char desc[40];
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int i, j, rid, rtype;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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if (dev != acpi_timer_dev)
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return (ENXIO);
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rid = 0;
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rtype = AcpiGbl_FADT->XPmTmrBlk.AddressSpaceId ?
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SYS_RES_IOPORT : SYS_RES_MEMORY;
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acpi_timer_reg = bus_alloc_resource_any(dev, rtype, &rid, RF_ACTIVE);
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if (acpi_timer_reg == NULL) {
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device_printf(dev, "couldn't allocate resource (%s 0x%lx)\n",
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(rtype == SYS_RES_IOPORT) ? "port" : "mem",
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(u_long)AcpiGbl_FADT->XPmTmrBlk.Address);
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return (ENXIO);
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}
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acpi_timer_bsh = rman_get_bushandle(acpi_timer_reg);
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acpi_timer_bst = rman_get_bustag(acpi_timer_reg);
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if (AcpiGbl_FADT->TmrValExt != 0)
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acpi_timer_timecounter.tc_counter_mask = 0xffffffff;
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else
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acpi_timer_timecounter.tc_counter_mask = 0x00ffffff;
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acpi_timer_timecounter.tc_frequency = acpi_timer_frequency;
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if (testenv("debug.acpi.timer_test"))
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acpi_timer_boot_test();
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/*
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* If all tests of the counter succeed, use the ACPI-fast method. If
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* at least one failed, default to using the safe routine, which reads
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* the timer multiple times to get a consistent value before returning.
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*/
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j = 0;
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if (bootverbose)
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printf("ACPI timer:");
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for (i = 0; i < 10; i++)
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j += acpi_timer_test();
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if (bootverbose)
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printf(" -> %d\n", j);
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if (j == 10) {
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acpi_timer_timecounter.tc_name = "ACPI-fast";
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acpi_timer_timecounter.tc_get_timecount = acpi_timer_get_timecount;
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} else {
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acpi_timer_timecounter.tc_name = "ACPI-safe";
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acpi_timer_timecounter.tc_get_timecount = acpi_timer_get_timecount_safe;
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}
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tc_init(&acpi_timer_timecounter);
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sprintf(desc, "%d-bit timer at 3.579545MHz",
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AcpiGbl_FADT->TmrValExt ? 32 : 24);
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device_set_desc_copy(dev, desc);
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/* Release the resource, we'll allocate it again during attach. */
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bus_release_resource(dev, rtype, rid, acpi_timer_reg);
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return (0);
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}
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static int
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acpi_timer_attach(device_t dev)
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{
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int rid, rtype;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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rid = 0;
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rtype = AcpiGbl_FADT->XPmTmrBlk.AddressSpaceId ?
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SYS_RES_IOPORT : SYS_RES_MEMORY;
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acpi_timer_reg = bus_alloc_resource_any(dev, rtype, &rid, RF_ACTIVE);
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if (acpi_timer_reg == NULL)
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return (ENXIO);
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acpi_timer_bsh = rman_get_bushandle(acpi_timer_reg);
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acpi_timer_bst = rman_get_bustag(acpi_timer_reg);
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return (0);
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}
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/*
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* Fetch current time value from reliable hardware.
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*/
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static u_int
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acpi_timer_get_timecount(struct timecounter *tc)
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{
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return (acpi_timer_read());
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}
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/*
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* Fetch current time value from hardware that may not correctly
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* latch the counter. We need to read until we have three monotonic
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* samples and then use the middle one, otherwise we are not protected
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* against the fact that the bits can be wrong in two directions. If
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* we only cared about monosity, two reads would be enough.
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*/
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static u_int
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acpi_timer_get_timecount_safe(struct timecounter *tc)
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{
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u_int u1, u2, u3;
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u2 = acpi_timer_read();
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u3 = acpi_timer_read();
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do {
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u1 = u2;
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u2 = u3;
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u3 = acpi_timer_read();
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} while (u1 > u2 || u2 > u3);
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return (u2);
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}
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/*
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* Timecounter freqency adjustment interface.
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*/
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static int
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acpi_timer_sysctl_freq(SYSCTL_HANDLER_ARGS)
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{
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int error;
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u_int freq;
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if (acpi_timer_timecounter.tc_frequency == 0)
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return (EOPNOTSUPP);
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freq = acpi_timer_frequency;
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error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
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if (error == 0 && req->newptr != NULL) {
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acpi_timer_frequency = freq;
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acpi_timer_timecounter.tc_frequency = acpi_timer_frequency;
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}
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return (error);
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}
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SYSCTL_PROC(_machdep, OID_AUTO, acpi_timer_freq, CTLTYPE_INT | CTLFLAG_RW,
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0, sizeof(u_int), acpi_timer_sysctl_freq, "I", "");
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/*
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* Some ACPI timers are known or believed to suffer from implementation
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* problems which can lead to erroneous values being read. This function
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* tests for consistent results from the timer and returns 1 if it believes
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* the timer is consistent, otherwise it returns 0.
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*
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* It appears the cause is that the counter is not latched to the PCI bus
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* clock when read:
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*
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* ] 20. ACPI Timer Errata
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* ]
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* ] Problem: The power management timer may return improper result when
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* ] read. Although the timer value settles properly after incrementing,
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* ] while incrementing there is a 3nS window every 69.8nS where the
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* ] timer value is indeterminate (a 4.2% chance that the data will be
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* ] incorrect when read). As a result, the ACPI free running count up
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* ] timer specification is violated due to erroneous reads. Implication:
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* ] System hangs due to the "inaccuracy" of the timer when used by
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* ] software for time critical events and delays.
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* ]
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* ] Workaround: Read the register twice and compare.
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* ] Status: This will not be fixed in the PIIX4 or PIIX4E, it is fixed
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* ] in the PIIX4M.
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*/
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#define N 2000
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static int
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acpi_timer_test()
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{
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uint32_t last, this;
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int min, max, n, delta;
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register_t s;
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min = 10000000;
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max = 0;
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/* Test the timer with interrupts disabled to get accurate results. */
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s = intr_disable();
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last = acpi_timer_read();
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for (n = 0; n < N; n++) {
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this = acpi_timer_read();
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delta = acpi_TimerDelta(this, last);
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if (delta > max)
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max = delta;
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else if (delta < min)
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min = delta;
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last = this;
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}
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intr_restore(s);
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if (max - min > 2)
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n = 0;
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else if (min < 0 || max == 0)
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n = 0;
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else
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n = 1;
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if (bootverbose)
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printf(" %d/%d", n, max-min);
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return (n);
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}
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#undef N
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/*
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* Test harness for verifying ACPI timer behaviour.
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* Boot with debug.acpi.timer_test set to invoke this.
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*/
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static void
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acpi_timer_boot_test(void)
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{
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uint32_t u1, u2, u3;
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u1 = acpi_timer_read();
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u2 = acpi_timer_read();
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u3 = acpi_timer_read();
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device_printf(acpi_timer_dev, "timer test in progress, reboot to quit.\n");
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for (;;) {
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/*
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* The failure case is where u3 > u1, but u2 does not fall between
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* the two, ie. it contains garbage.
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*/
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if (u3 > u1) {
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if (u2 < u1 || u2 > u3)
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device_printf(acpi_timer_dev,
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"timer is not monotonic: 0x%08x,0x%08x,0x%08x\n",
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u1, u2, u3);
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}
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u1 = u2;
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u2 = u3;
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u3 = acpi_timer_read();
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}
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}
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