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/* $OpenBSD: amdpm.c,v 1.3 2002/11/04 17:12:34 fgsch 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/timeout.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
#include <dev/rndvar.h>
#include <dev/pci/amdpmreg.h>
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 timeout sc_rnd_ch;
#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 *, void *, void *);
void amdpm_attach(struct device *, struct device *, void *);
void amdpm_rnd_callout(void *);
struct cfattach amdpm_ca = {
sizeof(struct amdpm_softc), amdpm_match, amdpm_attach
};
struct cfdriver amdpm_cd = {
NULL, "amdpm", DV_DULL
};
#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, void *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;
struct timeval tv1, tv2;
pcireg_t reg;
int i;
sc->sc_pc = pa->pa_pc;
sc->sc_tag = pa->pa_tag;
sc->sc_iot = pa->pa_iot;
reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
if ((reg & AMDPM_PMIOEN) == 0) {
printf(": PMxx space isn't enabled\n");
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)) {
printf(": failed to map PMxx space\n");
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);
/* benchmark the RNG */
microtime(&tv1);
for (i = 2 * 1024; i--; ) {
while(!(bus_space_read_1(sc->sc_iot, sc->sc_ioh,
AMDPM_RNGSTAT) & AMDPM_RNGDONE))
;
(void) bus_space_read_4(sc->sc_iot, sc->sc_ioh,
AMDPM_RNGDATA);
}
microtime(&tv2);
timersub(&tv2, &tv1, &tv1);
if (tv1.tv_sec)
tv1.tv_usec += 1000000 * tv1.tv_sec;
printf(": rng active, %dKb/sec", 8 * 1000000 / tv1.tv_usec);
#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
timeout_set(&sc->sc_rnd_ch, amdpm_rnd_callout, sc);
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);
add_true_randomness(reg);
#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);
timeout_add(&sc->sc_rnd_ch, 1);
}
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