/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2004-2005 Bruno Ducrot * Copyright (c) 2004 FUKUDA Nobuhiko * * 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 ``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 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. */ /* * Many thanks to Nate Lawson for his helpful comments on this driver and * to Jung-uk Kim for testing. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "cpufreq_if.h" #define PN7_TYPE 0 #define PN8_TYPE 1 /* Flags for some hardware bugs. */ #define A0_ERRATA 0x1 /* Bugs for the rev. A0 of Athlon (K7): * Interrupts must be disabled and no half * multipliers are allowed */ #define PENDING_STUCK 0x2 /* With some buggy chipset and some newer AMD64 * processor (Rev. G?): * the pending bit from the msr FIDVID_STATUS * is set forever. No workaround :( */ /* Legacy configuration via BIOS table PSB. */ #define PSB_START 0 #define PSB_STEP 0x10 #define PSB_SIG "AMDK7PNOW!" #define PSB_LEN 10 #define PSB_OFF 0 struct psb_header { char signature[10]; uint8_t version; uint8_t flags; uint16_t settlingtime; uint8_t res1; uint8_t numpst; } __packed; struct pst_header { uint32_t cpuid; uint8_t fsb; uint8_t maxfid; uint8_t startvid; uint8_t numpstates; } __packed; /* * MSRs and bits used by Powernow technology */ #define MSR_AMDK7_FIDVID_CTL 0xc0010041 #define MSR_AMDK7_FIDVID_STATUS 0xc0010042 /* Bitfields used by K7 */ #define PN7_CTR_FID(x) ((x) & 0x1f) #define PN7_CTR_VID(x) (((x) & 0x1f) << 8) #define PN7_CTR_FIDC 0x00010000 #define PN7_CTR_VIDC 0x00020000 #define PN7_CTR_FIDCHRATIO 0x00100000 #define PN7_CTR_SGTC(x) (((uint64_t)(x) & 0x000fffff) << 32) #define PN7_STA_CFID(x) ((x) & 0x1f) #define PN7_STA_SFID(x) (((x) >> 8) & 0x1f) #define PN7_STA_MFID(x) (((x) >> 16) & 0x1f) #define PN7_STA_CVID(x) (((x) >> 32) & 0x1f) #define PN7_STA_SVID(x) (((x) >> 40) & 0x1f) #define PN7_STA_MVID(x) (((x) >> 48) & 0x1f) /* ACPI ctr_val status register to powernow k7 configuration */ #define ACPI_PN7_CTRL_TO_FID(x) ((x) & 0x1f) #define ACPI_PN7_CTRL_TO_VID(x) (((x) >> 5) & 0x1f) #define ACPI_PN7_CTRL_TO_SGTC(x) (((x) >> 10) & 0xffff) /* Bitfields used by K8 */ #define PN8_CTR_FID(x) ((x) & 0x3f) #define PN8_CTR_VID(x) (((x) & 0x1f) << 8) #define PN8_CTR_PENDING(x) (((x) & 1) << 32) #define PN8_STA_CFID(x) ((x) & 0x3f) #define PN8_STA_SFID(x) (((x) >> 8) & 0x3f) #define PN8_STA_MFID(x) (((x) >> 16) & 0x3f) #define PN8_STA_PENDING(x) (((x) >> 31) & 0x01) #define PN8_STA_CVID(x) (((x) >> 32) & 0x1f) #define PN8_STA_SVID(x) (((x) >> 40) & 0x1f) #define PN8_STA_MVID(x) (((x) >> 48) & 0x1f) /* Reserved1 to powernow k8 configuration */ #define PN8_PSB_TO_RVO(x) ((x) & 0x03) #define PN8_PSB_TO_IRT(x) (((x) >> 2) & 0x03) #define PN8_PSB_TO_MVS(x) (((x) >> 4) & 0x03) #define PN8_PSB_TO_BATT(x) (((x) >> 6) & 0x03) /* ACPI ctr_val status register to powernow k8 configuration */ #define ACPI_PN8_CTRL_TO_FID(x) ((x) & 0x3f) #define ACPI_PN8_CTRL_TO_VID(x) (((x) >> 6) & 0x1f) #define ACPI_PN8_CTRL_TO_VST(x) (((x) >> 11) & 0x1f) #define ACPI_PN8_CTRL_TO_MVS(x) (((x) >> 18) & 0x03) #define ACPI_PN8_CTRL_TO_PLL(x) (((x) >> 20) & 0x7f) #define ACPI_PN8_CTRL_TO_RVO(x) (((x) >> 28) & 0x03) #define ACPI_PN8_CTRL_TO_IRT(x) (((x) >> 30) & 0x03) #define WRITE_FIDVID(fid, vid, ctrl) \ wrmsr(MSR_AMDK7_FIDVID_CTL, \ (((ctrl) << 32) | (1ULL << 16) | ((vid) << 8) | (fid))) #define COUNT_OFF_IRT(irt) DELAY(10 * (1 << (irt))) #define COUNT_OFF_VST(vst) DELAY(20 * (vst)) #define FID_TO_VCO_FID(fid) \ (((fid) < 8) ? (8 + ((fid) << 1)) : (fid)) /* * Divide each value by 10 to get the processor multiplier. * Some of those tables are the same as the Linux powernow-k7 * implementation by Dave Jones. */ static int pn7_fid_to_mult[32] = { 110, 115, 120, 125, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 30, 190, 40, 200, 130, 135, 140, 210, 150, 225, 160, 165, 170, 180, 0, 0, }; static int pn8_fid_to_mult[64] = { 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 185, 190, 195, 200, 205, 210, 215, 220, 225, 230, 235, 240, 245, 250, 255, 260, 265, 270, 275, 280, 285, 290, 295, 300, 305, 310, 315, 320, 325, 330, 335, 340, 345, 350, 355, }; /* * Units are in mV. */ /* Mobile VRM (K7) */ static int pn7_mobile_vid_to_volts[] = { 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, 1075, 1050, 1025, 1000, 975, 950, 925, 0, }; /* Desktop VRM (K7) */ static int pn7_desktop_vid_to_volts[] = { 2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650, 1600, 1550, 1500, 1450, 1400, 1350, 1300, 0, 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, 1075, 1050, 1025, 1000, 975, 950, 925, 0, }; /* Desktop and Mobile VRM (K8) */ static int pn8_vid_to_volts[] = { 1550, 1525, 1500, 1475, 1450, 1425, 1400, 1375, 1350, 1325, 1300, 1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100, 1075, 1050, 1025, 1000, 975, 950, 925, 900, 875, 850, 825, 800, 0, }; #define POWERNOW_MAX_STATES 16 struct powernow_state { int freq; int power; int fid; int vid; }; struct pn_softc { device_t dev; int pn_type; struct powernow_state powernow_states[POWERNOW_MAX_STATES]; u_int fsb; u_int sgtc; u_int vst; u_int mvs; u_int pll; u_int rvo; u_int irt; int low; int powernow_max_states; u_int powernow_state; u_int errata; int *vid_to_volts; }; /* * Offsets in struct cf_setting array for private values given by * acpi_perf driver. */ #define PX_SPEC_CONTROL 0 #define PX_SPEC_STATUS 1 static void pn_identify(driver_t *driver, device_t parent); static int pn_probe(device_t dev); static int pn_attach(device_t dev); static int pn_detach(device_t dev); static int pn_set(device_t dev, const struct cf_setting *cf); static int pn_get(device_t dev, struct cf_setting *cf); static int pn_settings(device_t dev, struct cf_setting *sets, int *count); static int pn_type(device_t dev, int *type); static device_method_t pn_methods[] = { /* Device interface */ DEVMETHOD(device_identify, pn_identify), DEVMETHOD(device_probe, pn_probe), DEVMETHOD(device_attach, pn_attach), DEVMETHOD(device_detach, pn_detach), /* cpufreq interface */ DEVMETHOD(cpufreq_drv_set, pn_set), DEVMETHOD(cpufreq_drv_get, pn_get), DEVMETHOD(cpufreq_drv_settings, pn_settings), DEVMETHOD(cpufreq_drv_type, pn_type), {0, 0} }; static driver_t pn_driver = { "powernow", pn_methods, sizeof(struct pn_softc), }; DRIVER_MODULE(powernow, cpu, pn_driver, 0, 0); static int pn7_setfidvid(struct pn_softc *sc, int fid, int vid) { int cfid, cvid; uint64_t status, ctl; status = rdmsr(MSR_AMDK7_FIDVID_STATUS); cfid = PN7_STA_CFID(status); cvid = PN7_STA_CVID(status); /* We're already at the requested level. */ if (fid == cfid && vid == cvid) return (0); ctl = rdmsr(MSR_AMDK7_FIDVID_CTL) & PN7_CTR_FIDCHRATIO; ctl |= PN7_CTR_FID(fid); ctl |= PN7_CTR_VID(vid); ctl |= PN7_CTR_SGTC(sc->sgtc); if (sc->errata & A0_ERRATA) disable_intr(); if (pn7_fid_to_mult[fid] < pn7_fid_to_mult[cfid]) { wrmsr(MSR_AMDK7_FIDVID_CTL, ctl | PN7_CTR_FIDC); if (vid != cvid) wrmsr(MSR_AMDK7_FIDVID_CTL, ctl | PN7_CTR_VIDC); } else { wrmsr(MSR_AMDK7_FIDVID_CTL, ctl | PN7_CTR_VIDC); if (fid != cfid) wrmsr(MSR_AMDK7_FIDVID_CTL, ctl | PN7_CTR_FIDC); } if (sc->errata & A0_ERRATA) enable_intr(); return (0); } static int pn8_read_pending_wait(uint64_t *status) { int i = 10000; do *status = rdmsr(MSR_AMDK7_FIDVID_STATUS); while (PN8_STA_PENDING(*status) && --i); return (i == 0 ? ENXIO : 0); } static int pn8_write_fidvid(u_int fid, u_int vid, uint64_t ctrl, uint64_t *status) { int i = 100; do WRITE_FIDVID(fid, vid, ctrl); while (pn8_read_pending_wait(status) && --i); return (i == 0 ? ENXIO : 0); } static int pn8_setfidvid(struct pn_softc *sc, int fid, int vid) { uint64_t status; int cfid, cvid; int rvo; int rv; u_int val; rv = pn8_read_pending_wait(&status); if (rv) return (rv); cfid = PN8_STA_CFID(status); cvid = PN8_STA_CVID(status); if (fid == cfid && vid == cvid) return (0); /* * Phase 1: Raise core voltage to requested VID if frequency is * going up. */ while (cvid > vid) { val = cvid - (1 << sc->mvs); rv = pn8_write_fidvid(cfid, (val > 0) ? val : 0, 1ULL, &status); if (rv) { sc->errata |= PENDING_STUCK; return (rv); } cvid = PN8_STA_CVID(status); COUNT_OFF_VST(sc->vst); } /* ... then raise to voltage + RVO (if required) */ for (rvo = sc->rvo; rvo > 0 && cvid > 0; --rvo) { /* XXX It's not clear from spec if we have to do that * in 0.25 step or in MVS. Therefore do it as it's done * under Linux */ rv = pn8_write_fidvid(cfid, cvid - 1, 1ULL, &status); if (rv) { sc->errata |= PENDING_STUCK; return (rv); } cvid = PN8_STA_CVID(status); COUNT_OFF_VST(sc->vst); } /* Phase 2: change to requested core frequency */ if (cfid != fid) { u_int vco_fid, vco_cfid, fid_delta; vco_fid = FID_TO_VCO_FID(fid); vco_cfid = FID_TO_VCO_FID(cfid); while (abs(vco_fid - vco_cfid) > 2) { fid_delta = (vco_cfid & 1) ? 1 : 2; if (fid > cfid) { if (cfid > 7) val = cfid + fid_delta; else val = FID_TO_VCO_FID(cfid) + fid_delta; } else val = cfid - fid_delta; rv = pn8_write_fidvid(val, cvid, sc->pll * (uint64_t) sc->fsb, &status); if (rv) { sc->errata |= PENDING_STUCK; return (rv); } cfid = PN8_STA_CFID(status); COUNT_OFF_IRT(sc->irt); vco_cfid = FID_TO_VCO_FID(cfid); } rv = pn8_write_fidvid(fid, cvid, sc->pll * (uint64_t) sc->fsb, &status); if (rv) { sc->errata |= PENDING_STUCK; return (rv); } cfid = PN8_STA_CFID(status); COUNT_OFF_IRT(sc->irt); } /* Phase 3: change to requested voltage */ if (cvid != vid) { rv = pn8_write_fidvid(cfid, vid, 1ULL, &status); cvid = PN8_STA_CVID(status); COUNT_OFF_VST(sc->vst); } /* Check if transition failed. */ if (cfid != fid || cvid != vid) rv = ENXIO; return (rv); } static int pn_set(device_t dev, const struct cf_setting *cf) { struct pn_softc *sc; int fid, vid; int i; int rv; if (cf == NULL) return (EINVAL); sc = device_get_softc(dev); if (sc->errata & PENDING_STUCK) return (ENXIO); for (i = 0; i < sc->powernow_max_states; ++i) if (CPUFREQ_CMP(sc->powernow_states[i].freq / 1000, cf->freq)) break; fid = sc->powernow_states[i].fid; vid = sc->powernow_states[i].vid; rv = ENODEV; switch (sc->pn_type) { case PN7_TYPE: rv = pn7_setfidvid(sc, fid, vid); break; case PN8_TYPE: rv = pn8_setfidvid(sc, fid, vid); break; } return (rv); } static int pn_get(device_t dev, struct cf_setting *cf) { struct pn_softc *sc; u_int cfid = 0, cvid = 0; int i; uint64_t status; if (cf == NULL) return (EINVAL); sc = device_get_softc(dev); if (sc->errata & PENDING_STUCK) return (ENXIO); status = rdmsr(MSR_AMDK7_FIDVID_STATUS); switch (sc->pn_type) { case PN7_TYPE: cfid = PN7_STA_CFID(status); cvid = PN7_STA_CVID(status); break; case PN8_TYPE: cfid = PN8_STA_CFID(status); cvid = PN8_STA_CVID(status); break; } for (i = 0; i < sc->powernow_max_states; ++i) if (cfid == sc->powernow_states[i].fid && cvid == sc->powernow_states[i].vid) break; if (i < sc->powernow_max_states) { cf->freq = sc->powernow_states[i].freq / 1000; cf->power = sc->powernow_states[i].power; cf->lat = 200; cf->volts = sc->vid_to_volts[cvid]; cf->dev = dev; } else { memset(cf, CPUFREQ_VAL_UNKNOWN, sizeof(*cf)); cf->dev = NULL; } return (0); } static int pn_settings(device_t dev, struct cf_setting *sets, int *count) { struct pn_softc *sc; int i; if (sets == NULL|| count == NULL) return (EINVAL); sc = device_get_softc(dev); if (*count < sc->powernow_max_states) return (E2BIG); for (i = 0; i < sc->powernow_max_states; ++i) { sets[i].freq = sc->powernow_states[i].freq / 1000; sets[i].power = sc->powernow_states[i].power; sets[i].lat = 200; sets[i].volts = sc->vid_to_volts[sc->powernow_states[i].vid]; sets[i].dev = dev; } *count = sc->powernow_max_states; return (0); } static int pn_type(device_t dev, int *type) { if (type == NULL) return (EINVAL); *type = CPUFREQ_TYPE_ABSOLUTE; return (0); } /* * Given a set of pair of fid/vid, and number of performance states, * compute powernow_states via an insertion sort. */ static int decode_pst(struct pn_softc *sc, uint8_t *p, int npstates) { int i, j, n; struct powernow_state state; for (i = 0; i < POWERNOW_MAX_STATES; ++i) sc->powernow_states[i].freq = CPUFREQ_VAL_UNKNOWN; for (n = 0, i = 0; i < npstates; ++i) { state.fid = *p++; state.vid = *p++; state.power = CPUFREQ_VAL_UNKNOWN; switch (sc->pn_type) { case PN7_TYPE: state.freq = 100 * pn7_fid_to_mult[state.fid] * sc->fsb; if ((sc->errata & A0_ERRATA) && (pn7_fid_to_mult[state.fid] % 10) == 5) continue; break; case PN8_TYPE: state.freq = 100 * pn8_fid_to_mult[state.fid] * sc->fsb; break; } j = n; while (j > 0 && sc->powernow_states[j - 1].freq < state.freq) { memcpy(&sc->powernow_states[j], &sc->powernow_states[j - 1], sizeof(struct powernow_state)); --j; } memcpy(&sc->powernow_states[j], &state, sizeof(struct powernow_state)); ++n; } /* * Fix powernow_max_states, if errata a0 give us less states * than expected. */ sc->powernow_max_states = n; if (bootverbose) for (i = 0; i < sc->powernow_max_states; ++i) { int fid = sc->powernow_states[i].fid; int vid = sc->powernow_states[i].vid; printf("powernow: %2i %8dkHz FID %02x VID %02x\n", i, sc->powernow_states[i].freq, fid, vid); } return (0); } static int cpuid_is_k7(u_int cpuid) { switch (cpuid) { case 0x760: case 0x761: case 0x762: case 0x770: case 0x771: case 0x780: case 0x781: case 0x7a0: return (TRUE); } return (FALSE); } static int pn_decode_pst(device_t dev) { int maxpst; struct pn_softc *sc; u_int cpuid, maxfid, startvid; u_long sig; struct psb_header *psb; uint8_t *p; u_int regs[4]; uint64_t status; sc = device_get_softc(dev); do_cpuid(0x80000001, regs); cpuid = regs[0]; if ((cpuid & 0xfff) == 0x760) sc->errata |= A0_ERRATA; status = rdmsr(MSR_AMDK7_FIDVID_STATUS); switch (sc->pn_type) { case PN7_TYPE: maxfid = PN7_STA_MFID(status); startvid = PN7_STA_SVID(status); break; case PN8_TYPE: maxfid = PN8_STA_MFID(status); /* * we should actually use a variable named 'maxvid' if K8, * but why introducing a new variable for that? */ startvid = PN8_STA_MVID(status); break; default: return (ENODEV); } if (bootverbose) { device_printf(dev, "STATUS: 0x%jx\n", status); device_printf(dev, "STATUS: maxfid: 0x%02x\n", maxfid); device_printf(dev, "STATUS: %s: 0x%02x\n", sc->pn_type == PN7_TYPE ? "startvid" : "maxvid", startvid); } sig = bios_sigsearch(PSB_START, PSB_SIG, PSB_LEN, PSB_STEP, PSB_OFF); if (sig) { struct pst_header *pst; psb = (struct psb_header*)(uintptr_t)BIOS_PADDRTOVADDR(sig); switch (psb->version) { default: return (ENODEV); case 0x14: /* * We can't be picky about numpst since at least * some systems have a value of 1 and some have 2. * We trust that cpuid_is_k7() will be better at * catching that we're on a K8 anyway. */ if (sc->pn_type != PN8_TYPE) return (EINVAL); sc->vst = psb->settlingtime; sc->rvo = PN8_PSB_TO_RVO(psb->res1); sc->irt = PN8_PSB_TO_IRT(psb->res1); sc->mvs = PN8_PSB_TO_MVS(psb->res1); sc->low = PN8_PSB_TO_BATT(psb->res1); if (bootverbose) { device_printf(dev, "PSB: VST: %d\n", psb->settlingtime); device_printf(dev, "PSB: RVO %x IRT %d " "MVS %d BATT %d\n", sc->rvo, sc->irt, sc->mvs, sc->low); } break; case 0x12: if (sc->pn_type != PN7_TYPE) return (EINVAL); sc->sgtc = psb->settlingtime * sc->fsb; if (sc->sgtc < 100 * sc->fsb) sc->sgtc = 100 * sc->fsb; break; } p = ((uint8_t *) psb) + sizeof(struct psb_header); pst = (struct pst_header*) p; maxpst = 200; do { struct pst_header *pst = (struct pst_header*) p; if (cpuid == pst->cpuid && maxfid == pst->maxfid && startvid == pst->startvid) { sc->powernow_max_states = pst->numpstates; switch (sc->pn_type) { case PN7_TYPE: if (abs(sc->fsb - pst->fsb) > 5) continue; break; case PN8_TYPE: break; } return (decode_pst(sc, p + sizeof(struct pst_header), sc->powernow_max_states)); } p += sizeof(struct pst_header) + (2 * pst->numpstates); } while (cpuid_is_k7(pst->cpuid) && maxpst--); device_printf(dev, "no match for extended cpuid %.3x\n", cpuid); } return (ENODEV); } static int pn_decode_acpi(device_t dev, device_t perf_dev) { int i, j, n; uint64_t status; uint32_t ctrl; u_int cpuid; u_int regs[4]; struct pn_softc *sc; struct powernow_state state; struct cf_setting sets[POWERNOW_MAX_STATES]; int count = POWERNOW_MAX_STATES; int type; int rv; if (perf_dev == NULL) return (ENXIO); rv = CPUFREQ_DRV_SETTINGS(perf_dev, sets, &count); if (rv) return (ENXIO); rv = CPUFREQ_DRV_TYPE(perf_dev, &type); if (rv || (type & CPUFREQ_FLAG_INFO_ONLY) == 0) return (ENXIO); sc = device_get_softc(dev); do_cpuid(0x80000001, regs); cpuid = regs[0]; if ((cpuid & 0xfff) == 0x760) sc->errata |= A0_ERRATA; ctrl = 0; sc->sgtc = 0; for (n = 0, i = 0; i < count; ++i) { ctrl = sets[i].spec[PX_SPEC_CONTROL]; switch (sc->pn_type) { case PN7_TYPE: state.fid = ACPI_PN7_CTRL_TO_FID(ctrl); state.vid = ACPI_PN7_CTRL_TO_VID(ctrl); if ((sc->errata & A0_ERRATA) && (pn7_fid_to_mult[state.fid] % 10) == 5) continue; break; case PN8_TYPE: state.fid = ACPI_PN8_CTRL_TO_FID(ctrl); state.vid = ACPI_PN8_CTRL_TO_VID(ctrl); break; } state.freq = sets[i].freq * 1000; state.power = sets[i].power; j = n; while (j > 0 && sc->powernow_states[j - 1].freq < state.freq) { memcpy(&sc->powernow_states[j], &sc->powernow_states[j - 1], sizeof(struct powernow_state)); --j; } memcpy(&sc->powernow_states[j], &state, sizeof(struct powernow_state)); ++n; } sc->powernow_max_states = n; state = sc->powernow_states[0]; status = rdmsr(MSR_AMDK7_FIDVID_STATUS); switch (sc->pn_type) { case PN7_TYPE: sc->sgtc = ACPI_PN7_CTRL_TO_SGTC(ctrl); /* * XXX Some bios forget the max frequency! * This maybe indicates we have the wrong tables. Therefore, * don't implement a quirk, but fallback to BIOS legacy * tables instead. */ if (PN7_STA_MFID(status) != state.fid) { device_printf(dev, "ACPI MAX frequency not found\n"); return (EINVAL); } sc->fsb = state.freq / 100 / pn7_fid_to_mult[state.fid]; break; case PN8_TYPE: sc->vst = ACPI_PN8_CTRL_TO_VST(ctrl), sc->mvs = ACPI_PN8_CTRL_TO_MVS(ctrl), sc->pll = ACPI_PN8_CTRL_TO_PLL(ctrl), sc->rvo = ACPI_PN8_CTRL_TO_RVO(ctrl), sc->irt = ACPI_PN8_CTRL_TO_IRT(ctrl); sc->low = 0; /* XXX */ /* * powernow k8 supports only one low frequency. */ if (sc->powernow_max_states >= 2 && (sc->powernow_states[sc->powernow_max_states - 2].fid < 8)) return (EINVAL); sc->fsb = state.freq / 100 / pn8_fid_to_mult[state.fid]; break; } return (0); } static void pn_identify(driver_t *driver, device_t parent) { if ((amd_pminfo & AMDPM_FID) == 0 || (amd_pminfo & AMDPM_VID) == 0) return; switch (cpu_id & 0xf00) { case 0x600: case 0xf00: break; default: return; } if (device_find_child(parent, "powernow", -1) != NULL) return; if (BUS_ADD_CHILD(parent, 10, "powernow", device_get_unit(parent)) == NULL) device_printf(parent, "powernow: add child failed\n"); } static int pn_probe(device_t dev) { struct pn_softc *sc; uint64_t status; uint64_t rate; struct pcpu *pc; u_int sfid, mfid, cfid; sc = device_get_softc(dev); sc->errata = 0; status = rdmsr(MSR_AMDK7_FIDVID_STATUS); pc = cpu_get_pcpu(dev); if (pc == NULL) return (ENODEV); cpu_est_clockrate(pc->pc_cpuid, &rate); switch (cpu_id & 0xf00) { case 0x600: sfid = PN7_STA_SFID(status); mfid = PN7_STA_MFID(status); cfid = PN7_STA_CFID(status); sc->pn_type = PN7_TYPE; sc->fsb = rate / 100000 / pn7_fid_to_mult[cfid]; /* * If start FID is different to max FID, then it is a * mobile processor. If not, it is a low powered desktop * processor. */ if (sfid != mfid) { sc->vid_to_volts = pn7_mobile_vid_to_volts; device_set_desc(dev, "PowerNow! K7"); } else { sc->vid_to_volts = pn7_desktop_vid_to_volts; device_set_desc(dev, "Cool`n'Quiet K7"); } break; case 0xf00: sfid = PN8_STA_SFID(status); mfid = PN8_STA_MFID(status); cfid = PN8_STA_CFID(status); sc->pn_type = PN8_TYPE; sc->vid_to_volts = pn8_vid_to_volts; sc->fsb = rate / 100000 / pn8_fid_to_mult[cfid]; if (sfid != mfid) device_set_desc(dev, "PowerNow! K8"); else device_set_desc(dev, "Cool`n'Quiet K8"); break; default: return (ENODEV); } return (0); } static int pn_attach(device_t dev) { int rv; device_t child; child = device_find_child(device_get_parent(dev), "acpi_perf", -1); if (child) { rv = pn_decode_acpi(dev, child); if (rv) rv = pn_decode_pst(dev); } else rv = pn_decode_pst(dev); if (rv != 0) return (ENXIO); cpufreq_register(dev); return (0); } static int pn_detach(device_t dev) { return (cpufreq_unregister(dev)); }