/* $NetBSD: sbwdog.c,v 1.15 2017/07/24 09:56:46 mrg Exp $ */
/*
* Copyright (c) 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc.
*
* 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 for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
/*
* Watchdog timer support for the Broadcom BCM1250 processor.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sbwdog.c,v 1.15 2017/07/24 09:56:46 mrg Exp $");
#include "locators.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/wdog.h>
#include <dev/sysmon/sysmonvar.h>
#include <mips/locore.h>
#include <mips/sibyte/include/sb1250_regs.h>
#include <mips/sibyte/include/sb1250_scd.h>
#include <mips/sibyte/dev/sbscdvar.h>
#include <evbmips/sbmips/systemsw.h>
#define SBWDOG_DEFAULT_PERIOD 5 /* Default to 5 seconds. */
struct sbwdog_softc {
device_t sc_dev;
struct sysmon_wdog sc_smw;
u_long sc_addr;
int sc_wdog_armed;
int sc_wdog_period;
};
static int sbwdog_match(device_t, cfdata_t, void *);
static void sbwdog_attach(device_t, device_t, void *);
static int sbwdog_tickle(struct sysmon_wdog *);
static int sbwdog_setmode(struct sysmon_wdog *);
static void sbwdog_intr(void *, uint32_t, vaddr_t);
CFATTACH_DECL_NEW(sbwdog, sizeof(struct sbwdog_softc),
sbwdog_match, sbwdog_attach, NULL, NULL);
#define READ_REG(rp) (mips3_ld((register_t)(rp)))
#define WRITE_REG(rp, val) (mips3_sd((register_t)(rp), (val)))
static int
sbwdog_match(device_t parent, cfdata_t cf, void *aux)
{
struct sbscd_attach_args *sa = aux;
if (sa->sa_locs.sa_type != SBSCD_DEVTYPE_WDOG)
return (0);
return (1);
}
static void
sbwdog_attach(device_t parent, device_t self, void *aux)
{
struct sbwdog_softc *sc = device_private(self);
struct sbscd_attach_args *sa = aux;
sc->sc_dev = self;
sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD;
sc->sc_addr = MIPS_PHYS_TO_KSEG1(sa->sa_base + sa->sa_locs.sa_offset);
aprint_normal(": %d second period\n", sc->sc_wdog_period);
sc->sc_smw.smw_name = device_xname(sc->sc_dev);
sc->sc_smw.smw_cookie = sc;
sc->sc_smw.smw_setmode = sbwdog_setmode;
sc->sc_smw.smw_tickle = sbwdog_tickle;
sc->sc_smw.smw_period = sc->sc_wdog_period;
if (sysmon_wdog_register(&sc->sc_smw) != 0)
aprint_error_dev(self, "unable to register with sysmon\n");
if (sa->sa_locs.sa_intr[0] != SBOBIOCF_INTR_DEFAULT)
cpu_intr_establish(sa->sa_locs.sa_intr[0], IPL_HIGH,
sbwdog_intr, sc);
}
static int
sbwdog_tickle(struct sysmon_wdog *smw)
{
struct sbwdog_softc *sc = smw->smw_cookie;
WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE);
return (0);
}
static void
sbwdog_intr(void *v, uint32_t cause, vaddr_t pc)
{
struct sbwdog_softc *sc = v;
WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE);
WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, 0);
WRITE_REG(sc->sc_addr + R_SCD_WDOG_INIT,
sc->sc_wdog_period * V_SCD_WDOG_FREQ);
WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE);
}
static int
sbwdog_setmode(struct sysmon_wdog *smw)
{
struct sbwdog_softc *sc = smw->smw_cookie;
if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
if (sc->sc_wdog_armed)
WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, 0);
} else {
if (smw->smw_period == WDOG_PERIOD_DEFAULT) {
sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD;
smw->smw_period = SBWDOG_DEFAULT_PERIOD; /* XXX needed?? */
} else if (smw->smw_period > 8) {
/* Maximum of 2^23 usec watchdog period. */
return (EINVAL);
}
sc->sc_wdog_period = smw->smw_period;
sc->sc_wdog_armed = 1;
WRITE_REG(sc->sc_addr + R_SCD_WDOG_INIT,
sc->sc_wdog_period * V_SCD_WDOG_FREQ);
/* Watchdog is armed by tickling it. */
sbwdog_tickle(smw);
}
return (0);
}