/* $NetBSD: amdpm.c,v 1.7 2003/09/01 06:30:24 tls Exp $ */ /*- * Copyright (c) 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Enami Tsugutomo. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 __KERNEL_RCSID(0, "$NetBSD: amdpm.c,v 1.7 2003/09/01 06:30:24 tls Exp $"); #include "opt_amdpm.h" #include #include #include #include #include #include #include #include #include #include struct amdpm_softc { struct device sc_dev; pci_chipset_tag_t sc_pc; pcitag_t sc_tag; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; /* PMxx space */ struct callout sc_rnd_ch; rndsource_element_t sc_rnd_source; #ifdef AMDPM_RND_COUNTERS struct evcnt sc_rnd_hits; struct evcnt sc_rnd_miss; struct evcnt sc_rnd_data[256]; #endif }; int amdpm_match(struct device *, struct cfdata *, void *); void amdpm_attach(struct device *, struct device *, void *); void amdpm_rnd_callout(void *); CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc), amdpm_match, amdpm_attach, NULL, NULL); #ifdef AMDPM_RND_COUNTERS #define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++ #else #define AMDPM_RNDCNT_INCR(ev) /* nothing */ #endif int amdpm_match(struct device *parent, struct cfdata *match, void *aux) { struct pci_attach_args *pa = aux; if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD && PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC) return (1); return (0); } void amdpm_attach(struct device *parent, struct device *self, void *aux) { struct amdpm_softc *sc = (struct amdpm_softc *) self; struct pci_attach_args *pa = aux; pcireg_t reg; u_int32_t pmreg; int i; aprint_naive("\n"); aprint_normal("\n"); sc->sc_pc = pa->pa_pc; sc->sc_tag = pa->pa_tag; sc->sc_iot = pa->pa_iot; #if 0 aprint_normal("%s: ", sc->sc_dev.dv_xname); pci_conf_print(pa->pa_pc, pa->pa_tag, NULL); #endif reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); if ((reg & AMDPM_PMIOEN) == 0) { aprint_error("%s: PMxx space isn't enabled\n", sc->sc_dev.dv_xname); return; } reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR); if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(reg), AMDPM_PMSIZE, 0, &sc->sc_ioh)) { aprint_error("%s: failed to map PMxx space\n", sc->sc_dev.dv_xname); return; } reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG); if (reg & AMDPM_RNGEN) { /* Check to see if we can read data from the RNG. */ (void) bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGDATA); for (i = 0; i < 1000; i++) { pmreg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT); if (pmreg & AMDPM_RNGDONE) break; delay(1); } if ((pmreg & AMDPM_RNGDONE) != 0) { aprint_normal("%s: " "random number generator enabled (apprx. %dms)\n", sc->sc_dev.dv_xname, i); callout_init(&sc->sc_rnd_ch); rnd_attach_source(&sc->sc_rnd_source, sc->sc_dev.dv_xname, RND_TYPE_RNG, /* * XXX Careful! The use of RND_FLAG_NO_ESTIMATE * XXX here is unobvious: we later feed raw bits * XXX into the "entropy pool" with rnd_add_data, * XXX explicitly supplying an entropy estimate. * XXX In this context, NO_ESTIMATE serves only * XXX to prevent rnd_add_data from trying to * XXX use the *time at which we added the data* * XXX as entropy, which is not a good idea since * XXX we add data periodically from a callout. */ RND_FLAG_NO_ESTIMATE); #ifdef AMDPM_RND_COUNTERS evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname, "rnd hits"); evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname, "rnd miss"); for (i = 0; i < 256; i++) { evcnt_attach_dynamic(&sc->sc_rnd_data[i], EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname, "rnd data"); } #endif amdpm_rnd_callout(sc); } } } void amdpm_rnd_callout(void *v) { struct amdpm_softc *sc = v; u_int32_t reg; #ifdef AMDPM_RND_COUNTERS int i; #endif if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) & AMDPM_RNGDONE) != 0) { reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGDATA); rnd_add_data(&sc->sc_rnd_source, ®, sizeof(reg), sizeof(reg) * NBBY); #ifdef AMDPM_RND_COUNTERS AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits); for (i = 0; i < sizeof(reg); i++, reg >>= NBBY) AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[reg & 0xff]); #endif } else AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss); callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc); }