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/* $OpenBSD: elan520.c,v 1.2 2003/08/07 16:59:37 mickey Exp $ */
/* $NetBSD: elan520.c,v 1.4 2002/10/02 05:47:15 thorpej Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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.
*/
/*
* Device driver for the AMD Elan SC520 System Controller. This attaches
* where the "pchb" driver might normally attach, and provides support for
* extra features on the SC520, such as the watchdog timer and GPIO.
*
* Information about the GP bus echo bug work-around is from code posted
* to the "soekris-tech" mailing list by Jasper Wallace.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <machine/bus.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <arch/i386/pci/elan520reg.h>
struct elansc_softc {
struct device sc_dev;
bus_space_tag_t sc_memt;
bus_space_handle_t sc_memh;
int sc_echobug;
};
int elansc_match(struct device *, void *, void *);
void elansc_attach(struct device *, struct device *, void *);
void elansc_wdogctl(struct elansc_softc *, int, uint16_t);
#define elansc_wdogctl_reset(sc) elansc_wdogctl(sc, 1, 0)
#define elansc_wdogctl_write(sc, val) elansc_wdogctl(sc, 0, val)
int elansc_wdogctl_cb(void *, int);
struct cfattach elansc_ca = {
sizeof(struct elansc_softc), elansc_match, elansc_attach
};
struct cfdriver elansc_cd = {
NULL, "elansc", DV_DULL
};
int
elansc_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_ELANSC520)
return (10); /* beat pchb */
return (0);
}
static const char *elansc_speeds[] = {
"(reserved 00)",
"100MHz",
"133MHz",
"(reserved 11)",
};
#define RSTBITS "\20\x07SCP\x06HRST\x05SRST\x04WDT\x03SD\x02PRGRST\x01PWRGOOD"
void
elansc_attach(struct device *parent, struct device *self, void *aux)
{
struct elansc_softc *sc = (void *) self;
struct pci_attach_args *pa = aux;
uint16_t rev;
uint8_t ressta, cpuctl;
printf("\n");
sc->sc_memt = pa->pa_memt;
if (bus_space_map(sc->sc_memt, MMCR_BASE_ADDR, NBPG, 0,
&sc->sc_memh) != 0) {
printf(": unable to map registers\n");
return;
}
rev = bus_space_read_2(sc->sc_memt, sc->sc_memh, MMCR_REVID);
cpuctl = bus_space_read_1(sc->sc_memt, sc->sc_memh, MMCR_CPUCTL);
ressta = bus_space_read_1(sc->sc_memt, sc->sc_memh, MMCR_RESSTA);
printf(": product %d stepping %d.%d, CPU clock %s, reset %b\n",
(rev & REVID_PRODID) >> REVID_PRODID_SHIFT,
(rev & REVID_MAJSTEP) >> REVID_MAJSTEP_SHIFT,
(rev & REVID_MINSTEP),
elansc_speeds[cpuctl & CPUCTL_CPU_CLK_SPD_MASK],
ressta, RSTBITS);
/*
* SC520 rev A1 has a bug that affects the watchdog timer. If
* the GP bus echo mode is enabled, writing to the watchdog control
* register is blocked.
*
* The BIOS in some systems (e.g. the Soekris net4501) enables
* GP bus echo for various reasons, so we need to switch it off
* when we talk to the watchdog timer.
*
* XXX The step 1.1 (B1?) in my Soekris net4501 also has this
* XXX problem, so we'll just enable it for all Elan SC520s
* XXX for now. --thorpej@netbsd.org
*/
if (1 || rev == ((PRODID_ELAN_SC520 << REVID_PRODID_SHIFT) |
(0 << REVID_MAJSTEP_SHIFT) | (1)))
sc->sc_echobug = 1;
/*
* Determine cause of the last reset, and issue a warning if it
* was due to watchdog expiry.
*/
if (ressta & RESSTA_WDT_RST_DET)
printf("%s: WARNING: LAST RESET DUE TO WATCHDOG EXPIRATION!\n",
sc->sc_dev.dv_xname);
bus_space_write_1(sc->sc_memt, sc->sc_memh, MMCR_RESSTA, ressta);
/* Set up the watchdog registers with some defaults. */
elansc_wdogctl_write(sc, WDTMRCTL_WRST_ENB | WDTMRCTL_EXP_SEL30);
/* ...and clear it. */
elansc_wdogctl_reset(sc);
wdog_register(sc, elansc_wdogctl_cb);
}
void
elansc_wdogctl(struct elansc_softc *sc, int do_reset, uint16_t val)
{
int s;
uint8_t echo_mode;
s = splhigh();
/* Switch off GP bus echo mode if we need to. */
if (sc->sc_echobug) {
echo_mode = bus_space_read_1(sc->sc_memt, sc->sc_memh,
MMCR_GPECHO);
bus_space_write_1(sc->sc_memt, sc->sc_memh,
MMCR_GPECHO, echo_mode & ~GPECHO_GP_ECHO_ENB);
}
if (do_reset) {
/* Reset the watchdog. */
bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL,
WDTMRCTL_RESET1);
bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL,
WDTMRCTL_RESET2);
} else {
/* Unlock the register. */
bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL,
WDTMRCTL_UNLOCK1);
bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL,
WDTMRCTL_UNLOCK2);
/* Write the value. */
bus_space_write_2(sc->sc_memt, sc->sc_memh, MMCR_WDTMRCTL,
val);
}
/* Switch GP bus echo mode back. */
if (sc->sc_echobug)
bus_space_write_1(sc->sc_memt, sc->sc_memh, MMCR_GPECHO,
echo_mode);
splx(s);
}
static const struct {
int period; /* whole seconds */
uint16_t exp; /* exponent select */
} elansc_wdog_periods[] = {
{ 1, WDTMRCTL_EXP_SEL25 },
{ 2, WDTMRCTL_EXP_SEL26 },
{ 4, WDTMRCTL_EXP_SEL27 },
{ 8, WDTMRCTL_EXP_SEL28 },
{ 16, WDTMRCTL_EXP_SEL29 },
{ 32, WDTMRCTL_EXP_SEL30 },
};
int
elansc_wdogctl_cb(void *self, int period)
{
struct elansc_softc *sc = self;
int i;
if (period == 0) {
elansc_wdogctl_write(sc,
WDTMRCTL_WRST_ENB | WDTMRCTL_EXP_SEL30);
} else {
for (i = 0; i < (sizeof(elansc_wdog_periods) /
sizeof(elansc_wdog_periods[0])) - 1; i++)
if (elansc_wdog_periods[i].period >= period)
break;
period = elansc_wdog_periods[i].period;
elansc_wdogctl_write(sc, WDTMRCTL_ENB |
WDTMRCTL_WRST_ENB | elansc_wdog_periods[i].exp);
elansc_wdogctl_reset(sc);
}
return (period);
}
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