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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/usb/mos/@/dev/wbwd/wbwd.c |
/*-
* Copyright (c) 2011 Sandvine Incorporated ULC.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*
* Support for Winbond watchdog.
*
* With minor abstractions it might be possible to add support for other
* different Winbond Super I/O chips as well. Winbond seems to have four
* different types of chips, four different ways to get into extended config
* mode.
*
* Note: there is no serialization between the debugging sysctl handlers and
* the watchdog functions and possibly others poking the registers at the same
* time. For that at least possibly interfering sysctls are hidden by default.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/wbwd/wbwd.c 237343 2012-06-20 21:34:03Z rnoland $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/eventhandler.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <sys/watchdog.h>
#include <isa/isavar.h>
#include <machine/bus.h>
#include <machine/resource.h>
/*
* Global registers.
*/
#define WB_DEVICE_ID_REG 0x20 /* Device ID */
#define WB_DEVICE_REV_REG 0x21 /* Device revision */
#define WB_CR26 0x26 /* Bit6: HEFRAS (base port selector) */
/* LDN selection. */
#define WB_LDN_REG 0x07
#define WB_LDN_REG_LDN8 0x08 /* GPIO 2, Watchdog */
/*
* LDN8 (GPIO 2, Watchdog) specific registers and options.
*/
/* CR30: LDN8 activation control. */
#define WB_LDN8_CR30 0x30
#define WB_LDN8_CR30_ACTIVE 0x01 /* 1: LD active */
/* CRF5: Watchdog scale, P20. Mapped to reg_1. */
#define WB_LDN8_CRF5 0xF5
#define WB_LDN8_CRF5_SCALE 0x08 /* 0: 1s, 1: 60s */
#define WB_LDN8_CRF5_KEYB_P20 0x04 /* 1: keyb P20 forces timeout */
#define WB_LDN8_CRF5_KBRST 0x02 /* 1: timeout causes pin60 kbd reset */
/* CRF6: Watchdog Timeout (0 == off). Mapped to reg_timeout. */
#define WB_LDN8_CRF6 0xF6
/* CRF7: Watchdog mouse, keyb, force, .. Mapped to reg_2. */
#define WB_LDN8_CRF7 0xF7
#define WB_LDN8_CRF7_MOUSE 0x80 /* 1: mouse irq resets wd timer */
#define WB_LDN8_CRF7_KEYB 0x40 /* 1: keyb irq resets wd timer */
#define WB_LDN8_CRF7_FORCE 0x20 /* 1: force timeout (self-clear) */
#define WB_LDN8_CRF7_TS 0x10 /* 0: counting, 1: fired */
#define WB_LDN8_CRF7_IRQS 0x0f /* irq source for watchdog, 2 == SMI */
#define WB_LDN8_CRF7_CLEAR_MASK \
(WB_LDN8_CRF7_MOUSE|WB_LDN8_CRF7_KEYB|WB_LDN8_CRF7_TS|WB_LDN8_CRF7_IRQS)
#define write_efir_1(sc, value) \
bus_space_write_1((sc)->bst, (sc)->bsh, 0, (value))
#define read_efir_1(sc) \
bus_space_read_1((sc)->bst, (sc)->bsh, 0)
#define write_efdr_1(sc, value) \
bus_space_write_1((sc)->bst, (sc)->bsh, 1, (value))
#define read_efdr_1(sc) \
bus_space_read_1((sc)->bst, (sc)->bsh, 1)
struct wb_softc {
device_t dev;
struct resource *portres;
bus_space_tag_t bst;
bus_space_handle_t bsh;
int rid;
eventhandler_tag ev_tag;
int (*ext_cfg_enter_f)(struct wb_softc *);
void (*ext_cfg_exit_f)(struct wb_softc *);
int debug_verbose;
/*
* Special feature to let the watchdog fire at a different
* timeout as set by watchdog(4) but still use that API to
* re-load it periodically.
*/
unsigned int timeout_override;
/*
* Space to save current state temporary and for sysctls.
* We want to know the timeout value and usually need two
* additional registers for options. Do not name them by
* register as these might be different by chip.
*/
uint8_t reg_timeout;
uint8_t reg_1;
uint8_t reg_2;
};
static int ext_cfg_enter_0x87_0x87(struct wb_softc *);
static void ext_cfg_exit_0xaa(struct wb_softc *);
struct winbond_superio_cfg {
uint8_t efer; /* and efir */
int (*ext_cfg_enter_f)(struct wb_softc *);
void (*ext_cfg_exit_f)(struct wb_softc *);
} probe_addrs[] = {
{
.efer = 0x2e,
.ext_cfg_enter_f = ext_cfg_enter_0x87_0x87,
.ext_cfg_exit_f = ext_cfg_exit_0xaa,
},
{
.efer = 0x4e,
.ext_cfg_enter_f = ext_cfg_enter_0x87_0x87,
.ext_cfg_exit_f = ext_cfg_exit_0xaa,
},
};
struct winbond_vendor_device_id {
uint16_t vendor_id;
uint8_t device_id;
uint8_t device_rev;
const char * descr;
} wb_devs[] = {
{
.vendor_id = 0x5ca3,
.device_id = 0x52,
.device_rev = 0x17,
.descr = "Winbond 83627HF/F/HG/G Rev. G",
},
{
.vendor_id = 0x5ca3,
.device_id = 0x52,
.device_rev = 0x3a,
.descr = "Winbond 83627HF/F/HG/G Rev. J",
},
{
.vendor_id = 0x5ca3,
.device_id = 0x52,
.device_rev = 0x41,
.descr = "Winbond 83627HF/F/HG/G Rev. UD-A",
},
{
.vendor_id = 0x5ca3,
.device_id = 0xa0,
.device_rev = 0x25,
.descr = "Winbond 83627DHG IC ver. 5",
},
{
.vendor_id = 0x5ca3,
.device_id = 0xb0,
.device_rev = 0x73,
.descr = "Winbond 83627DHG-P",
},
};
/*
* Return the watchdog related registers as we last read them. This will
* usually not give the current timeout or state on whether the watchdog
* fired.
*/
static int
sysctl_wb_debug(SYSCTL_HANDLER_ARGS)
{
struct wb_softc *sc;
struct sbuf sb;
int error;
sc = arg1;
sbuf_new_for_sysctl(&sb, NULL, 64, req);
sbuf_printf(&sb, "LDN8 (GPIO2, Watchdog): ");
sbuf_printf(&sb, "CRF5 0x%02x ", sc->reg_1);
sbuf_printf(&sb, "CRF6 0x%02x ", sc->reg_timeout);
sbuf_printf(&sb, "CRF7 0x%02x ", sc->reg_2);
sbuf_trim(&sb);
error = sbuf_finish(&sb);
sbuf_delete(&sb);
return (error);
}
/*
* Read the current values before returning them. Given this might poke
* the registers the same time as the watchdog, this sysctl handler should
* be marked CTLFLAG_SKIP to not show up by default.
*/
static int
sysctl_wb_debug_current(SYSCTL_HANDLER_ARGS)
{
struct wb_softc *sc;
sc = arg1;
/*
* Enter extended function mode in case someone else has been
* poking on the registers. We will not leave it though.
*/
if ((*sc->ext_cfg_enter_f)(sc) != 0)
return (ENXIO);
/* Watchdog is configured as part of LDN 8 (GPIO Port2, Watchdog). */
write_efir_1(sc, WB_LDN_REG);
write_efdr_1(sc, WB_LDN_REG_LDN8);
write_efir_1(sc, WB_LDN8_CRF5);
sc->reg_1 = read_efdr_1(sc);
write_efir_1(sc, WB_LDN8_CRF6);
sc->reg_timeout = read_efdr_1(sc);
write_efir_1(sc, WB_LDN8_CRF7);
sc->reg_2 = read_efdr_1(sc);
return (sysctl_wb_debug(oidp, arg1, arg2, req));
}
/*
* Sysctl handlers to force a watchdog timeout or to test the NMI functionality
* works as expetced.
* For testing we could set a test_nmi flag in the softc that, in case of NMI, a
* callback function from trap.c could check whether we fired and not report the
* timeout but clear the flag for the sysctl again. This is interesting given a
* lot of boards have jumpers to change the action on watchdog timeout or
* disable the watchdog completely.
* XXX-BZ notyet: currently no general infrastructure exists to do this.
*/
static int
sysctl_wb_force_test_nmi(SYSCTL_HANDLER_ARGS)
{
struct wb_softc *sc;
int error, test, val;
sc = arg1;
test = arg2;
#ifdef notyet
val = sc->test_nmi;
#else
val = 0;
#endif
error = sysctl_handle_int(oidp, &val, 0, req);
if (error || !req->newptr)
return (error);
#ifdef notyet
/* Manually clear the test for a value of 0 and do nothing else. */
if (test && val == 0) {
sc->test_nmi = 0;
return (0);
}
#endif
/*
* Enter extended function mode in case someone else has been
* poking on the registers. We will not leave it though.
*/
if ((*sc->ext_cfg_enter_f)(sc) != 0)
return (ENXIO);
#ifdef notyet
/*
* If we are testing the NMI functionality, set the flag before
* forcing the timeout.
*/
if (test)
sc->test_nmi = 1;
#endif
/* Watchdog is configured as part of LDN 8 (GPIO Port2, Watchdog). */
write_efir_1(sc, WB_LDN_REG);
write_efdr_1(sc, WB_LDN_REG_LDN8);
/* Force watchdog to fire. */
write_efir_1(sc, WB_LDN8_CRF7);
sc->reg_2 = read_efdr_1(sc);
sc->reg_2 |= WB_LDN8_CRF7_FORCE;
write_efir_1(sc, WB_LDN8_CRF7);
write_efdr_1(sc, sc->reg_2);
return (0);
}
/*
* Print current watchdog state.
*
* Note: it is the responsibility of the caller to update the registers
* upfront.
*/
static void
wb_print_state(struct wb_softc *sc, const char *msg)
{
device_printf(sc->dev, "%s%sWatchdog %sabled. %s"
"Scaling by %ds, timer at %d (%s=%ds%s). "
"CRF5 0x%02x CRF7 0x%02x\n",
(msg != NULL) ? msg : "", (msg != NULL) ? ": " : "",
(sc->reg_timeout > 0x00) ? "en" : "dis",
(sc->reg_2 & WB_LDN8_CRF7_TS) ? "Watchdog fired. " : "",
(sc->reg_1 & WB_LDN8_CRF5_SCALE) ? 60 : 1,
sc->reg_timeout,
(sc->reg_timeout > 0x00) ? "<" : "",
sc->reg_timeout * ((sc->reg_1 & WB_LDN8_CRF5_SCALE) ? 60 : 1),
(sc->reg_timeout > 0x00) ? " left" : "",
sc->reg_1, sc->reg_2);
}
/*
* Functions to enter and exit extended function mode. Possibly shared
* between different chips.
*/
static int
ext_cfg_enter_0x87_0x87(struct wb_softc *sc)
{
/*
* Enable extended function mode.
* Winbond does not allow us to validate so always return success.
*/
write_efir_1(sc, 0x87);
write_efir_1(sc, 0x87);
return (0);
}
static void
ext_cfg_exit_0xaa(struct wb_softc *sc)
{
write_efir_1(sc, 0xaa);
}
/*
* (Re)load the watchdog counter depending on timeout. A timeout of 0 will
* disable the watchdog.
*/
static int
wb_set_watchdog(struct wb_softc *sc, unsigned int timeout)
{
if (sc->debug_verbose)
wb_print_state(sc, "Before watchdog counter (re)load");
/*
* Enter extended function mode in case someone else has been
* poking on the registers. We will not leave it though.
*/
if ((*sc->ext_cfg_enter_f)(sc) != 0)
return (ENXIO);
/* Watchdog is configured as part of LDN 8 (GPIO Port2, Watchdog) */
write_efir_1(sc, WB_LDN_REG);
write_efdr_1(sc, WB_LDN_REG_LDN8);
/* Disable and validate or arm/reset watchdog. */
if (timeout == 0) {
/* Disable watchdog. */
write_efir_1(sc, WB_LDN8_CRF6);
write_efdr_1(sc, 0x00);
/* Re-check. */
write_efir_1(sc, WB_LDN8_CRF6);
sc->reg_timeout = read_efdr_1(sc);
if (sc->reg_timeout != 0x00) {
device_printf(sc->dev, "Failed to disable watchdog: "
"0x%02x.\n", sc->reg_timeout);
return (EIO);
}
} else {
/*
* In case an override is set, let it override. It may lead
* to strange results as we do not check the input of the sysctl.
*/
if (sc->timeout_override > 0)
timeout = sc->timeout_override;
/* Make sure we support the requested timeout. */
if (timeout > 255 * 60)
return (EINVAL);
/* Read current scaling factor. */
write_efir_1(sc, WB_LDN8_CRF5);
sc->reg_1 = read_efdr_1(sc);
if (timeout > 255) {
/* Set scaling factor to 60s. */
sc->reg_1 |= WB_LDN8_CRF5_SCALE;
sc->reg_timeout = (timeout / 60);
if (timeout % 60)
sc->reg_timeout++;
} else {
/* Set scaling factor to 1s. */
sc->reg_1 &= ~WB_LDN8_CRF5_SCALE;
sc->reg_timeout = timeout;
}
/* In case we fired before we need to clear to fire again. */
write_efir_1(sc, WB_LDN8_CRF7);
sc->reg_2 = read_efdr_1(sc);
if (sc->reg_2 & WB_LDN8_CRF7_TS) {
sc->reg_2 &= ~WB_LDN8_CRF7_TS;
write_efir_1(sc, WB_LDN8_CRF7);
write_efdr_1(sc, sc->reg_2);
}
/* Write back scaling factor. */
write_efir_1(sc, WB_LDN8_CRF5);
write_efdr_1(sc, sc->reg_1);
/* Set timer and arm/reset the watchdog. */
write_efir_1(sc, WB_LDN8_CRF6);
write_efdr_1(sc, sc->reg_timeout);
}
if (sc->debug_verbose)
wb_print_state(sc, "After watchdog counter (re)load");
return (0);
}
/*
* watchdog(9) EVENTHANDLER function implementation to (re)load the counter
* with the given timeout or disable the watchdog.
*/
static void
wb_watchdog_fn(void *private, u_int cmd, int *error)
{
struct wb_softc *sc;
unsigned int timeout;
int e;
sc = private;
KASSERT(sc != NULL, ("%s: watchdog handler function called without "
"softc.", __func__));
cmd &= WD_INTERVAL;
if (cmd > 0 && cmd <= 63) {
/* Reset (and arm) watchdog. */
timeout = ((uint64_t)1 << cmd) / 1000000000;
if (timeout == 0)
timeout = 1;
e = wb_set_watchdog(sc, timeout);
if (e == 0) {
if (error != NULL)
*error = 0;
} else {
/* On error, try to make sure the WD is disabled. */
wb_set_watchdog(sc, 0);
}
} else {
/* Disable watchdog. */
e = wb_set_watchdog(sc, 0);
if (e != 0 && cmd == 0 && error != NULL) {
/* Failed to disable watchdog. */
*error = EOPNOTSUPP;
}
}
}
/*
* Probe/attach the Winbond Super I/O chip.
*
* Initial abstraction to possibly support more chips:
* - Iterate over the well known base ports, try to enable extended function
* mode and read and match the device ID and device revision. Unfortunately
* the Vendor ID is in the hardware monitoring section accessible by different
* base ports only.
* - Also HEFRAS, which would tell use the base port, is only accessible after
* entering extended function mode, for which the base port is needed.
* At least check HEFRAS to match the current base port we are probing.
* - On match set the description, remember functions to enter/exit extended
* function mode as well as the base port.
*/
static int
wb_probe_enable(device_t dev, int probe)
{
struct wb_softc *sc;
int error, found, i, j;
uint8_t dev_id, dev_rev, cr26;
sc = device_get_softc(dev);
bzero(sc, sizeof(*sc));
sc->dev = dev;
error = ENXIO;
for (i = 0; i < sizeof(probe_addrs) / sizeof(*probe_addrs); i++) {
/* Allocate bus resources for IO index/data register access. */
sc->portres = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->rid,
probe_addrs[i].efer, probe_addrs[i].efer + 1, 2, RF_ACTIVE);
if (sc->portres == NULL)
continue;
sc->bst = rman_get_bustag(sc->portres);
sc->bsh = rman_get_bushandle(sc->portres);
found = 0;
error = (*probe_addrs[i].ext_cfg_enter_f)(sc);
if (error != 0)
goto cleanup;
/* Identify the SuperIO chip. */
write_efir_1(sc, WB_DEVICE_ID_REG);
dev_id = read_efdr_1(sc);
write_efir_1(sc, WB_DEVICE_REV_REG);
dev_rev = read_efdr_1(sc);
write_efir_1(sc, WB_CR26);
cr26 = read_efdr_1(sc);
/* HEFRAS of 0 means EFER at 0x2e, 1 means EFER at 0x4e. */
if (((cr26 & 0x40) == 0x00 && probe_addrs[i].efer != 0x2e) ||
((cr26 & 0x40) == 0x40 && probe_addrs[i].efer != 0x4e)) {
device_printf(dev, "HEFRAS and EFER do not align: EFER "
"0x%02x DevID 0x%02x DevRev 0x%02x CR26 0x%02x\n",
probe_addrs[i].efer, dev_id, dev_rev, cr26);
goto cleanup;
}
for (j = 0; j < sizeof(wb_devs) / sizeof(*wb_devs); j++) {
if (wb_devs[j].device_id == dev_id &&
wb_devs[j].device_rev == dev_rev) {
if (probe)
device_set_desc(dev, wb_devs[j].descr);
found++;
break;
}
}
if (probe && found && bootverbose)
device_printf(dev, "%s EFER 0x%02x ID 0x%02x Rev 0x%02x"
" CR26 0x%02x (probing)\n", device_get_desc(dev),
probe_addrs[i].efer, dev_id, dev_rev, cr26);
cleanup:
if (probe || !found) {
(*probe_addrs[i].ext_cfg_exit_f)(sc);
(void) bus_release_resource(dev, SYS_RES_IOPORT, sc->rid,
sc->portres);
}
/*
* Stop probing if have successfully identified the SuperIO.
* Remember the extended function mode enter/exit functions
* for operations.
*/
if (found) {
sc->ext_cfg_enter_f = probe_addrs[i].ext_cfg_enter_f;
sc->ext_cfg_exit_f = probe_addrs[i].ext_cfg_exit_f;
error = BUS_PROBE_DEFAULT;
break;
} else
error = ENXIO;
}
return (error);
}
static int
wb_probe(device_t dev)
{
/* Make sure we do not claim some ISA PNP device. */
if (isa_get_logicalid(dev) != 0)
return (ENXIO);
return (wb_probe_enable(dev, 1));
}
static int
wb_attach(device_t dev)
{
struct wb_softc *sc;
struct sysctl_ctx_list *sctx;
struct sysctl_oid *soid;
unsigned long timeout;
int error;
error = wb_probe_enable(dev, 0);
if (error > 0)
return (ENXIO);
sc = device_get_softc(dev);
KASSERT(sc->ext_cfg_enter_f != NULL && sc->ext_cfg_exit_f != NULL,
("%s: successfull probe result but not setup correctly", __func__));
/* Watchdog is configured as part of LDN 8 (GPIO Port2, Watchdog). */
write_efir_1(sc, WB_LDN_REG);
write_efdr_1(sc, WB_LDN_REG_LDN8);
/* Make sure LDN8 is enabled (Do we need to? Also affects GPIO). */
write_efir_1(sc, WB_LDN8_CR30);
write_efdr_1(sc, WB_LDN8_CR30_ACTIVE);
/* Read the current watchdog configuration. */
write_efir_1(sc, WB_LDN8_CRF5);
sc->reg_1 = read_efdr_1(sc);
write_efir_1(sc, WB_LDN8_CRF6);
sc->reg_timeout = read_efdr_1(sc);
write_efir_1(sc, WB_LDN8_CRF7);
sc->reg_2 = read_efdr_1(sc);
/* Print current state if bootverbose or watchdog already enabled. */
if (bootverbose || (sc->reg_timeout > 0x00))
wb_print_state(sc, "Before watchdog attach");
/*
* Clear a previous watchdog timeout event (if (still) set).
* Disable all all interrupt reset sources (defaults).
*/
sc->reg_1 &= ~(WB_LDN8_CRF5_KEYB_P20);
sc->reg_1 |= WB_LDN8_CRF5_KBRST;
write_efir_1(sc, WB_LDN8_CRF5);
write_efdr_1(sc, sc->reg_1);
sc->reg_2 &= ~WB_LDN8_CRF7_CLEAR_MASK;
write_efir_1(sc, WB_LDN8_CRF7);
write_efdr_1(sc, sc->reg_2);
/* Read global timeout override tunable, Add per device sysctls. */
if (TUNABLE_ULONG_FETCH("hw.wbwd.timeout_override", &timeout)) {
if (timeout > 0)
sc->timeout_override = timeout;
}
sctx = device_get_sysctl_ctx(dev);
soid = device_get_sysctl_tree(dev);
SYSCTL_ADD_UINT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO,
"timeout_override", CTLFLAG_RW, &sc->timeout_override, 0,
"Timeout in seconds overriding default watchdog timeout");
SYSCTL_ADD_INT(sctx, SYSCTL_CHILDREN(soid), OID_AUTO,
"debug_verbose", CTLFLAG_RW, &sc->debug_verbose, 0,
"Enables extra debugging information");
SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "debug",
CTLTYPE_STRING|CTLFLAG_RD, sc, 0, sysctl_wb_debug, "A",
"Selected register information from last change by driver");
SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "debug_current",
CTLTYPE_STRING|CTLFLAG_RD|CTLFLAG_SKIP, sc, 0,
sysctl_wb_debug_current, "A",
"Selected register information (may interfere)");
SYSCTL_ADD_PROC(sctx, SYSCTL_CHILDREN(soid), OID_AUTO, "force_timeout",
CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_SKIP, sc, 0,
sysctl_wb_force_test_nmi, "I", "Enable to force watchdog to fire.");
/* Register watchdog. */
sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, wb_watchdog_fn, sc,
0);
if (bootverbose)
wb_print_state(sc, "After watchdog attach");
return (0);
}
static int
wb_detach(device_t dev)
{
struct wb_softc *sc;
sc = device_get_softc(dev);
/* Unregister and stop the watchdog if running. */
if (sc->ev_tag)
EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag);
wb_set_watchdog(sc, 0);
/* Disable extended function mode. */
(*sc->ext_cfg_exit_f)(sc);
/* Cleanup resources. */
(void) bus_release_resource(dev, SYS_RES_IOPORT, sc->rid, sc->portres);
/* Bus subroutines take care of sysctls already. */
return (0);
}
static device_method_t wb_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, wb_probe),
DEVMETHOD(device_attach, wb_attach),
DEVMETHOD(device_detach, wb_detach),
{ 0, 0 }
};
static driver_t wb_isa_driver = {
"wbwd",
wb_methods,
sizeof(struct wb_softc)
};
static devclass_t wb_devclass;
DRIVER_MODULE(wb, isa, wb_isa_driver, wb_devclass, NULL, NULL);