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/* $OpenBSD: berkwdt.c,v 1.6 2010/04/08 00:23:53 tedu Exp $ */
/*
* Copyright (c) 2009 Wim Van Sebroeck <wim@iguana.be>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Berkshire PCI-PC Watchdog Card Driver
* http://www.pcwatchdog.com/
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
struct berkwdt_softc {
struct device sc_dev;
/* device access through bus space */
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
/* the timeout period */
int sc_period;
};
int berkwdt_match(struct device *, void *, void *);
void berkwdt_attach(struct device *, struct device *, void *);
void berkwdt_start(struct berkwdt_softc *sc);
void berkwdt_stop(struct berkwdt_softc *sc);
void berkwdt_reload(struct berkwdt_softc *sc);
int berkwdt_send_command(struct berkwdt_softc *sc, u_int8_t cmd, int *val);
int berkwdt_set_timeout(void *, int);
struct cfattach berkwdt_ca = {
sizeof(struct berkwdt_softc), berkwdt_match, berkwdt_attach
};
struct cfdriver berkwdt_cd = {
NULL, "berkwdt", DV_DULL
};
const struct pci_matchid berkwdt_devices[] = {
{ PCI_VENDOR_PIJNENBURG, PCI_PRODUCT_PIJNENBURG_PCWD_PCI }
};
/* PCWD-PCI I/O Port definitions */
#define PCWD_PCI_RELOAD 0x00 /* Re-trigger */
#define PCWD_PCI_CS1 0x01 /* Control Status 1 */
#define PCWD_PCI_CS2 0x02 /* Control Status 2 */
#define PCWD_PCI_WDT_DIS 0x03 /* Watchdog Disable */
#define PCWD_PCI_LSB 0x04 /* Command / Response */
#define PCWD_PCI_MSB 0x05 /* Command/Response LSB */
#define PCWD_PCI_CMD 0x06 /* Command/Response MSB */
/* Port 1 : Control Status #1 */
#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */
#define WD_PCI_TTRP 0x04 /* Temperature Trip status */
#define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temp-trip reset */
/* Port 2 : Control Status #2 */
#define WD_PCI_WDIS 0x10 /* Watchdog Disable */
#define WD_PCI_WRSP 0x40 /* Watchdog wrote response */
/*
* According to documentation max. time to process a command for the pci
* watchdog card is 100 ms, so we give it 150 ms to do its job.
*/
#define PCI_CMD_TIMEOUT 150
/* Watchdog's internal commands */
#define CMD_WRITE_WD_TIMEOUT 0x19
int
berkwdt_send_command(struct berkwdt_softc *sc, u_int8_t cmd, int *val)
{
u_int8_t msb;
u_int8_t lsb;
u_int8_t got_response;
int count;
msb = *val / 256;
lsb = *val % 256;
/* Send command with data (data first!) */
bus_space_write_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_LSB, lsb);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_MSB, msb);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_CMD, cmd);
got_response = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_CS2);
got_response &= WD_PCI_WRSP;
for (count = 0; count < PCI_CMD_TIMEOUT && !got_response; count++) {
delay(1000);
got_response = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_CS2);
got_response &= WD_PCI_WRSP;
}
if (got_response) {
/* read back response */
lsb = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_LSB);
msb = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_MSB);
*val = (msb << 8) + lsb;
/* clear WRSP bit */
bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_CMD);
return 1;
}
return 0;
}
void
berkwdt_start(struct berkwdt_softc *sc)
{
u_int8_t reg;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_WDT_DIS, 0x00);
delay(1000);
reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_CS2);
if (reg & WD_PCI_WDIS) {
printf("%s: unable to enable\n", sc->sc_dev.dv_xname);
}
}
void
berkwdt_stop(struct berkwdt_softc *sc)
{
u_int8_t reg;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_WDT_DIS, 0xa5);
delay(1000);
bus_space_write_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_WDT_DIS, 0xa5);
delay(1000);
reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_CS2);
if (!(reg & WD_PCI_WDIS)) {
printf("%s: unable to disable\n", sc->sc_dev.dv_xname);
}
}
void
berkwdt_reload(struct berkwdt_softc *sc)
{
bus_space_write_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_RELOAD, 0x42);
}
int
berkwdt_match(struct device *parent, void *match, void *aux)
{
return (pci_matchbyid((struct pci_attach_args *)aux, berkwdt_devices,
sizeof(berkwdt_devices) / sizeof(berkwdt_devices[0])));
}
void
berkwdt_attach(struct device *parent, struct device *self, void *aux)
{
struct berkwdt_softc *sc = (struct berkwdt_softc *)self;
struct pci_attach_args *const pa = (struct pci_attach_args *)aux;
bus_size_t iosize;
u_int8_t reg;
/* retrieve the I/O region (BAR 0) */
if (pci_mapreg_map(pa, 0x10, PCI_MAPREG_TYPE_IO, 0,
&sc->sc_iot, &sc->sc_ioh, NULL, &iosize, 0) != 0) {
printf(": couldn't find PCI I/O region\n");
return;
}
/* Check for reboot by the card */
reg = bus_space_read_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_CS1);
if (reg & WD_PCI_WTRP) {
printf(", warning: watchdog triggered");
if (reg & WD_PCI_TTRP)
printf(", overheat detected");
/* clear trip status & LED and keep mode of relay 2 */
reg &= WD_PCI_R2DS;
reg |= WD_PCI_WTRP;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, PCWD_PCI_CS1, reg);
}
printf("\n");
/* ensure that the watchdog is disabled */
berkwdt_stop(sc);
sc->sc_period = 0;
/* register with the watchdog framework */
wdog_register(sc, berkwdt_set_timeout);
}
int
berkwdt_set_timeout(void *self, int timeout)
{
struct berkwdt_softc *sc = self;
int new_timeout = timeout;
if (timeout == 0) {
/* Disable watchdog */
berkwdt_stop(sc);
} else {
if (sc->sc_period != timeout) {
/* Set new timeout */
berkwdt_send_command(sc, CMD_WRITE_WD_TIMEOUT,
&new_timeout);
}
if (sc->sc_period == 0) {
/* Enable watchdog */
berkwdt_start(sc);
berkwdt_reload(sc);
} else {
/* Reset timer */
berkwdt_reload(sc);
}
}
sc->sc_period = timeout;
return (timeout);
}
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