/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2004-2005 Nate Lawson (SDG) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include "cpufreq_if.h" /* * The SpeedStep ICH feature is a chipset-initiated voltage and frequency * transition available on the ICH2M, 3M, and 4M. It is different from * the newer Pentium-M SpeedStep feature. It offers only two levels of * frequency/voltage. Often, the BIOS will select one of the levels via * SMM code during the power-on process (i.e., choose a lower level if the * system is off AC power.) */ struct ichss_softc { device_t dev; int bm_rid; /* Bus-mastering control (PM2REG). */ struct resource *bm_reg; int ctrl_rid; /* Control/status register. */ struct resource *ctrl_reg; struct cf_setting sets[2]; /* Only two settings. */ }; /* Supported PCI IDs. */ #define PCI_VENDOR_INTEL 0x8086 #define PCI_DEV_82801BA 0x244c /* ICH2M */ #define PCI_DEV_82801CA 0x248c /* ICH3M */ #define PCI_DEV_82801DB 0x24cc /* ICH4M */ #define PCI_DEV_82815_MC 0x1130 /* Unsupported/buggy part */ /* PCI config registers for finding PMBASE and enabling SpeedStep. */ #define ICHSS_PMBASE_OFFSET 0x40 #define ICHSS_PMCFG_OFFSET 0xa0 /* Values and masks. */ #define ICHSS_ENABLE (1<<3) /* Enable SpeedStep control. */ #define ICHSS_IO_REG 0x1 /* Access register via I/O space. */ #define ICHSS_PMBASE_MASK 0xff80 /* PMBASE address bits. */ #define ICHSS_CTRL_BIT 0x1 /* 0 is high speed, 1 is low. */ #define ICHSS_BM_DISABLE 0x1 /* Offsets from PMBASE for various registers. */ #define ICHSS_BM_OFFSET 0x20 #define ICHSS_CTRL_OFFSET 0x50 #define ICH_GET_REG(reg) \ (bus_space_read_1(rman_get_bustag((reg)), \ rman_get_bushandle((reg)), 0)) #define ICH_SET_REG(reg, val) \ (bus_space_write_1(rman_get_bustag((reg)), \ rman_get_bushandle((reg)), 0, (val))) static void ichss_identify(driver_t *driver, device_t parent); static int ichss_probe(device_t dev); static int ichss_attach(device_t dev); static int ichss_detach(device_t dev); static int ichss_settings(device_t dev, struct cf_setting *sets, int *count); static int ichss_set(device_t dev, const struct cf_setting *set); static int ichss_get(device_t dev, struct cf_setting *set); static int ichss_type(device_t dev, int *type); static device_method_t ichss_methods[] = { /* Device interface */ DEVMETHOD(device_identify, ichss_identify), DEVMETHOD(device_probe, ichss_probe), DEVMETHOD(device_attach, ichss_attach), DEVMETHOD(device_detach, ichss_detach), /* cpufreq interface */ DEVMETHOD(cpufreq_drv_set, ichss_set), DEVMETHOD(cpufreq_drv_get, ichss_get), DEVMETHOD(cpufreq_drv_type, ichss_type), DEVMETHOD(cpufreq_drv_settings, ichss_settings), DEVMETHOD_END }; static driver_t ichss_driver = { "ichss", ichss_methods, sizeof(struct ichss_softc) }; DRIVER_MODULE(ichss, cpu, ichss_driver, 0, 0); static device_t ich_device; #if 0 #define DPRINT(x...) printf(x) #else #define DPRINT(x...) #endif static void ichss_identify(driver_t *driver, device_t parent) { device_t child; uint32_t pmbase; if (resource_disabled("ichss", 0)) return; /* * It appears that ICH SpeedStep only requires a single CPU to * set the value (since the chipset is shared by all CPUs.) * Thus, we only add a child to cpu 0. */ if (device_get_unit(parent) != 0) return; /* Avoid duplicates. */ if (device_find_child(parent, "ichss", -1)) return; /* * ICH2/3/4-M I/O Controller Hub is at bus 0, slot 1F, function 0. * E.g. see Section 6.1 "PCI Devices and Functions" and table 6.1 of * Intel(r) 82801BA I/O Controller Hub 2 (ICH2) and Intel(r) 82801BAM * I/O Controller Hub 2 Mobile (ICH2-M). */ ich_device = pci_find_bsf(0, 0x1f, 0); if (ich_device == NULL || pci_get_vendor(ich_device) != PCI_VENDOR_INTEL || (pci_get_device(ich_device) != PCI_DEV_82801BA && pci_get_device(ich_device) != PCI_DEV_82801CA && pci_get_device(ich_device) != PCI_DEV_82801DB)) return; /* * Certain systems with ICH2 and an Intel 82815_MC host bridge * where the host bridge's revision is < 5 lockup if SpeedStep * is used. */ if (pci_get_device(ich_device) == PCI_DEV_82801BA) { device_t hostb; hostb = pci_find_bsf(0, 0, 0); if (hostb != NULL && pci_get_vendor(hostb) == PCI_VENDOR_INTEL && pci_get_device(hostb) == PCI_DEV_82815_MC && pci_get_revid(hostb) < 5) return; } /* Find the PMBASE register from our PCI config header. */ pmbase = pci_read_config(ich_device, ICHSS_PMBASE_OFFSET, sizeof(pmbase)); if ((pmbase & ICHSS_IO_REG) == 0) { printf("ichss: invalid PMBASE memory type\n"); return; } pmbase &= ICHSS_PMBASE_MASK; if (pmbase == 0) { printf("ichss: invalid zero PMBASE address\n"); return; } DPRINT("ichss: PMBASE is %#x\n", pmbase); child = BUS_ADD_CHILD(parent, 20, "ichss", 0); if (child == NULL) { device_printf(parent, "add SpeedStep child failed\n"); return; } /* Add the bus master arbitration and control registers. */ bus_set_resource(child, SYS_RES_IOPORT, 0, pmbase + ICHSS_BM_OFFSET, 1); bus_set_resource(child, SYS_RES_IOPORT, 1, pmbase + ICHSS_CTRL_OFFSET, 1); } static int ichss_probe(device_t dev) { device_t est_dev, perf_dev; int error, type; /* * If the ACPI perf driver has attached and is not just offering * info, let it manage things. Also, if Enhanced SpeedStep is * available, don't attach. */ perf_dev = device_find_child(device_get_parent(dev), "acpi_perf", -1); if (perf_dev && device_is_attached(perf_dev)) { error = CPUFREQ_DRV_TYPE(perf_dev, &type); if (error == 0 && (type & CPUFREQ_FLAG_INFO_ONLY) == 0) return (ENXIO); } est_dev = device_find_child(device_get_parent(dev), "est", -1); if (est_dev && device_is_attached(est_dev)) return (ENXIO); device_set_desc(dev, "SpeedStep ICH"); return (-1000); } static int ichss_attach(device_t dev) { struct ichss_softc *sc; uint16_t ss_en; sc = device_get_softc(dev); sc->dev = dev; sc->bm_rid = 0; sc->bm_reg = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &sc->bm_rid, RF_ACTIVE); if (sc->bm_reg == NULL) { device_printf(dev, "failed to alloc BM arb register\n"); return (ENXIO); } sc->ctrl_rid = 1; sc->ctrl_reg = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &sc->ctrl_rid, RF_ACTIVE); if (sc->ctrl_reg == NULL) { device_printf(dev, "failed to alloc control register\n"); bus_release_resource(dev, SYS_RES_IOPORT, sc->bm_rid, sc->bm_reg); return (ENXIO); } /* Activate SpeedStep control if not already enabled. */ ss_en = pci_read_config(ich_device, ICHSS_PMCFG_OFFSET, sizeof(ss_en)); if ((ss_en & ICHSS_ENABLE) == 0) { device_printf(dev, "enabling SpeedStep support\n"); pci_write_config(ich_device, ICHSS_PMCFG_OFFSET, ss_en | ICHSS_ENABLE, sizeof(ss_en)); } /* Setup some defaults for our exported settings. */ sc->sets[0].freq = CPUFREQ_VAL_UNKNOWN; sc->sets[0].volts = CPUFREQ_VAL_UNKNOWN; sc->sets[0].power = CPUFREQ_VAL_UNKNOWN; sc->sets[0].lat = 1000; sc->sets[0].dev = dev; sc->sets[1] = sc->sets[0]; cpufreq_register(dev); return (0); } static int ichss_detach(device_t dev) { /* TODO: teardown BM and CTRL registers. */ return (ENXIO); } static int ichss_settings(device_t dev, struct cf_setting *sets, int *count) { struct ichss_softc *sc; struct cf_setting set; int first, i; if (sets == NULL || count == NULL) return (EINVAL); if (*count < 2) { *count = 2; return (E2BIG); } sc = device_get_softc(dev); /* * Estimate frequencies for both levels, temporarily switching to * the other one if we haven't calibrated it yet. */ ichss_get(dev, &set); for (i = 0; i < 2; i++) { if (sc->sets[i].freq == CPUFREQ_VAL_UNKNOWN) { first = (i == 0) ? 1 : 0; ichss_set(dev, &sc->sets[i]); ichss_set(dev, &sc->sets[first]); } } bcopy(sc->sets, sets, sizeof(sc->sets)); *count = 2; return (0); } static int ichss_set(device_t dev, const struct cf_setting *set) { struct ichss_softc *sc; uint8_t bmval, new_val, old_val, req_val; uint64_t rate; register_t regs; /* Look up appropriate bit value based on frequency. */ sc = device_get_softc(dev); if (CPUFREQ_CMP(set->freq, sc->sets[0].freq)) req_val = 0; else if (CPUFREQ_CMP(set->freq, sc->sets[1].freq)) req_val = ICHSS_CTRL_BIT; else return (EINVAL); DPRINT("ichss: requested setting %d\n", req_val); /* Disable interrupts and get the other register contents. */ regs = intr_disable(); old_val = ICH_GET_REG(sc->ctrl_reg) & ~ICHSS_CTRL_BIT; /* * Disable bus master arbitration, write the new value to the control * register, and then re-enable bus master arbitration. */ bmval = ICH_GET_REG(sc->bm_reg) | ICHSS_BM_DISABLE; ICH_SET_REG(sc->bm_reg, bmval); ICH_SET_REG(sc->ctrl_reg, old_val | req_val); ICH_SET_REG(sc->bm_reg, bmval & ~ICHSS_BM_DISABLE); /* Get the new value and re-enable interrupts. */ new_val = ICH_GET_REG(sc->ctrl_reg); intr_restore(regs); /* Check if the desired state was indeed selected. */ if (req_val != (new_val & ICHSS_CTRL_BIT)) { device_printf(sc->dev, "transition to %d failed\n", req_val); return (ENXIO); } /* Re-initialize our cycle counter if we don't know this new state. */ if (sc->sets[req_val].freq == CPUFREQ_VAL_UNKNOWN) { cpu_est_clockrate(0, &rate); sc->sets[req_val].freq = rate / 1000000; DPRINT("ichss: set calibrated new rate of %d\n", sc->sets[req_val].freq); } return (0); } static int ichss_get(device_t dev, struct cf_setting *set) { struct ichss_softc *sc; uint64_t rate; uint8_t state; sc = device_get_softc(dev); state = ICH_GET_REG(sc->ctrl_reg) & ICHSS_CTRL_BIT; /* If we haven't changed settings yet, estimate the current value. */ if (sc->sets[state].freq == CPUFREQ_VAL_UNKNOWN) { cpu_est_clockrate(0, &rate); sc->sets[state].freq = rate / 1000000; DPRINT("ichss: get calibrated new rate of %d\n", sc->sets[state].freq); } *set = sc->sets[state]; return (0); } static int ichss_type(device_t dev, int *type) { if (type == NULL) return (EINVAL); *type = CPUFREQ_TYPE_ABSOLUTE; return (0); }