e12be3218a
This was enumerated with exhaustive search for sys/eventhandler.h includes, cross-referenced against EVENTHANDLER_* usage with the comm(1) utility. Manual checking was performed to avoid redundant includes in some drivers where a common os_bsd.h (for example) included sys/eventhandler.h indirectly, but it is possible some of these are redundant with driver-specific headers in ways I didn't notice. (These CUs did not show up as missing eventhandler.h in tinderbox.) X-MFC-With: r347984
308 lines
8.4 KiB
C
308 lines
8.4 KiB
C
/*-
|
|
* Copyright 2013-2015 John Wehle <john@feith.com>
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Amlogic aml8726 watchdog driver.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/rman.h>
|
|
|
|
#include <sys/watchdog.h>
|
|
|
|
#include <machine/bus.h>
|
|
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
|
|
#include <arm/amlogic/aml8726/aml8726_soc.h>
|
|
|
|
|
|
struct aml8726_wdt_softc {
|
|
device_t dev;
|
|
struct resource * res[2];
|
|
struct mtx mtx;
|
|
void * ih_cookie;
|
|
};
|
|
|
|
static struct resource_spec aml8726_wdt_spec[] = {
|
|
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
|
|
{ SYS_RES_IRQ, 0, RF_ACTIVE },
|
|
{ -1, 0 }
|
|
};
|
|
|
|
static struct {
|
|
uint32_t ctrl_cpu_mask;
|
|
uint32_t ctrl_en;
|
|
uint32_t term_cnt_mask;
|
|
uint32_t reset_cnt_mask;
|
|
} aml8726_wdt_soc_params;
|
|
|
|
/*
|
|
* devclass_get_device / device_get_softc could be used
|
|
* to dynamically locate this, however the wdt is a
|
|
* required device which can't be unloaded so there's
|
|
* no need for the overhead.
|
|
*/
|
|
static struct aml8726_wdt_softc *aml8726_wdt_sc = NULL;
|
|
|
|
#define AML_WDT_LOCK(sc) mtx_lock_spin(&(sc)->mtx)
|
|
#define AML_WDT_UNLOCK(sc) mtx_unlock_spin(&(sc)->mtx)
|
|
#define AML_WDT_LOCK_INIT(sc) \
|
|
mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \
|
|
"wdt", MTX_SPIN)
|
|
#define AML_WDT_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx);
|
|
|
|
#define AML_WDT_CTRL_REG 0
|
|
#define AML_WDT_CTRL_CPU_WDRESET_MASK aml8726_wdt_soc_params.ctrl_cpu_mask
|
|
#define AML_WDT_CTRL_CPU_WDRESET_SHIFT 24
|
|
#define AML_WDT_CTRL_IRQ_EN (1 << 23)
|
|
#define AML_WDT_CTRL_EN aml8726_wdt_soc_params.ctrl_en
|
|
#define AML_WDT_CTRL_TERMINAL_CNT_MASK aml8726_wdt_soc_params.term_cnt_mask
|
|
#define AML_WDT_CTRL_TERMINAL_CNT_SHIFT 0
|
|
#define AML_WDT_RESET_REG 4
|
|
#define AML_WDT_RESET_CNT_MASK aml8726_wdt_soc_params.reset_cnt_mask
|
|
#define AML_WDT_RESET_CNT_SHIFT 0
|
|
|
|
#define CSR_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val))
|
|
#define CSR_READ_4(sc, reg) bus_read_4((sc)->res[0], reg)
|
|
#define CSR_BARRIER(sc, reg) bus_barrier((sc)->res[0], reg, 4, \
|
|
(BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE))
|
|
|
|
static void
|
|
aml8726_wdt_watchdog(void *private, u_int cmd, int *error)
|
|
{
|
|
struct aml8726_wdt_softc *sc = (struct aml8726_wdt_softc *)private;
|
|
uint32_t wcr;
|
|
uint64_t tens_of_usec;
|
|
|
|
AML_WDT_LOCK(sc);
|
|
|
|
tens_of_usec = (((uint64_t)1 << (cmd & WD_INTERVAL)) + 9999) / 10000;
|
|
|
|
if (cmd != 0 && tens_of_usec <= (AML_WDT_CTRL_TERMINAL_CNT_MASK >>
|
|
AML_WDT_CTRL_TERMINAL_CNT_SHIFT)) {
|
|
|
|
wcr = AML_WDT_CTRL_CPU_WDRESET_MASK |
|
|
AML_WDT_CTRL_EN | ((uint32_t)tens_of_usec <<
|
|
AML_WDT_CTRL_TERMINAL_CNT_SHIFT);
|
|
|
|
CSR_WRITE_4(sc, AML_WDT_RESET_REG, 0);
|
|
CSR_WRITE_4(sc, AML_WDT_CTRL_REG, wcr);
|
|
|
|
*error = 0;
|
|
} else
|
|
CSR_WRITE_4(sc, AML_WDT_CTRL_REG,
|
|
(CSR_READ_4(sc, AML_WDT_CTRL_REG) &
|
|
~(AML_WDT_CTRL_IRQ_EN | AML_WDT_CTRL_EN)));
|
|
|
|
AML_WDT_UNLOCK(sc);
|
|
}
|
|
|
|
static int
|
|
aml8726_wdt_intr(void *arg)
|
|
{
|
|
struct aml8726_wdt_softc *sc = (struct aml8726_wdt_softc *)arg;
|
|
|
|
/*
|
|
* Normally a timeout causes a hardware reset, however
|
|
* the watchdog timer can be configured to cause an
|
|
* interrupt instead by setting AML_WDT_CTRL_IRQ_EN
|
|
* and clearing AML_WDT_CTRL_CPU_WDRESET_MASK.
|
|
*/
|
|
|
|
AML_WDT_LOCK(sc);
|
|
|
|
CSR_WRITE_4(sc, AML_WDT_CTRL_REG,
|
|
(CSR_READ_4(sc, AML_WDT_CTRL_REG) & ~(AML_WDT_CTRL_IRQ_EN |
|
|
AML_WDT_CTRL_EN)));
|
|
|
|
CSR_BARRIER(sc, AML_WDT_CTRL_REG);
|
|
|
|
AML_WDT_UNLOCK(sc);
|
|
|
|
device_printf(sc->dev, "timeout expired\n");
|
|
|
|
return (FILTER_HANDLED);
|
|
}
|
|
|
|
static int
|
|
aml8726_wdt_probe(device_t dev)
|
|
{
|
|
|
|
if (!ofw_bus_status_okay(dev))
|
|
return (ENXIO);
|
|
|
|
if (!ofw_bus_is_compatible(dev, "amlogic,meson6-wdt"))
|
|
return (ENXIO);
|
|
|
|
device_set_desc(dev, "Amlogic aml8726 WDT");
|
|
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
static int
|
|
aml8726_wdt_attach(device_t dev)
|
|
{
|
|
struct aml8726_wdt_softc *sc = device_get_softc(dev);
|
|
|
|
/* There should be exactly one instance. */
|
|
if (aml8726_wdt_sc != NULL)
|
|
return (ENXIO);
|
|
|
|
sc->dev = dev;
|
|
|
|
if (bus_alloc_resources(dev, aml8726_wdt_spec, sc->res)) {
|
|
device_printf(dev, "can not allocate resources for device\n");
|
|
return (ENXIO);
|
|
}
|
|
|
|
/*
|
|
* Certain bitfields are dependent on the hardware revision.
|
|
*/
|
|
switch (aml8726_soc_hw_rev) {
|
|
case AML_SOC_HW_REV_M8:
|
|
aml8726_wdt_soc_params.ctrl_cpu_mask = 0xf <<
|
|
AML_WDT_CTRL_CPU_WDRESET_SHIFT;
|
|
switch (aml8726_soc_metal_rev) {
|
|
case AML_SOC_M8_METAL_REV_M2_A:
|
|
aml8726_wdt_soc_params.ctrl_en = 1 << 19;
|
|
aml8726_wdt_soc_params.term_cnt_mask = 0x07ffff <<
|
|
AML_WDT_CTRL_TERMINAL_CNT_SHIFT;
|
|
aml8726_wdt_soc_params.reset_cnt_mask = 0x07ffff <<
|
|
AML_WDT_RESET_CNT_SHIFT;
|
|
break;
|
|
default:
|
|
aml8726_wdt_soc_params.ctrl_en = 1 << 22;
|
|
aml8726_wdt_soc_params.term_cnt_mask = 0x3fffff <<
|
|
AML_WDT_CTRL_TERMINAL_CNT_SHIFT;
|
|
aml8726_wdt_soc_params.reset_cnt_mask = 0x3fffff <<
|
|
AML_WDT_RESET_CNT_SHIFT;
|
|
break;
|
|
}
|
|
break;
|
|
case AML_SOC_HW_REV_M8B:
|
|
aml8726_wdt_soc_params.ctrl_cpu_mask = 0xf <<
|
|
AML_WDT_CTRL_CPU_WDRESET_SHIFT;
|
|
aml8726_wdt_soc_params.ctrl_en = 1 << 19;
|
|
aml8726_wdt_soc_params.term_cnt_mask = 0x07ffff <<
|
|
AML_WDT_CTRL_TERMINAL_CNT_SHIFT;
|
|
aml8726_wdt_soc_params.reset_cnt_mask = 0x07ffff <<
|
|
AML_WDT_RESET_CNT_SHIFT;
|
|
break;
|
|
default:
|
|
aml8726_wdt_soc_params.ctrl_cpu_mask = 3 <<
|
|
AML_WDT_CTRL_CPU_WDRESET_SHIFT;
|
|
aml8726_wdt_soc_params.ctrl_en = 1 << 22;
|
|
aml8726_wdt_soc_params.term_cnt_mask = 0x3fffff <<
|
|
AML_WDT_CTRL_TERMINAL_CNT_SHIFT;
|
|
aml8726_wdt_soc_params.reset_cnt_mask = 0x3fffff <<
|
|
AML_WDT_RESET_CNT_SHIFT;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Disable the watchdog.
|
|
*/
|
|
CSR_WRITE_4(sc, AML_WDT_CTRL_REG,
|
|
(CSR_READ_4(sc, AML_WDT_CTRL_REG) & ~(AML_WDT_CTRL_IRQ_EN |
|
|
AML_WDT_CTRL_EN)));
|
|
|
|
/*
|
|
* Initialize the mutex prior to installing the interrupt handler
|
|
* in case of a spurious interrupt.
|
|
*/
|
|
AML_WDT_LOCK_INIT(sc);
|
|
|
|
if (bus_setup_intr(dev, sc->res[1], INTR_TYPE_MISC | INTR_MPSAFE,
|
|
aml8726_wdt_intr, NULL, sc, &sc->ih_cookie)) {
|
|
device_printf(dev, "could not setup interrupt handler\n");
|
|
bus_release_resources(dev, aml8726_wdt_spec, sc->res);
|
|
AML_WDT_LOCK_DESTROY(sc);
|
|
return (ENXIO);
|
|
}
|
|
|
|
aml8726_wdt_sc = sc;
|
|
|
|
EVENTHANDLER_REGISTER(watchdog_list, aml8726_wdt_watchdog, sc, 0);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
aml8726_wdt_detach(device_t dev)
|
|
{
|
|
|
|
return (EBUSY);
|
|
}
|
|
|
|
static device_method_t aml8726_wdt_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, aml8726_wdt_probe),
|
|
DEVMETHOD(device_attach, aml8726_wdt_attach),
|
|
DEVMETHOD(device_detach, aml8726_wdt_detach),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t aml8726_wdt_driver = {
|
|
"wdt",
|
|
aml8726_wdt_methods,
|
|
sizeof(struct aml8726_wdt_softc),
|
|
};
|
|
|
|
static devclass_t aml8726_wdt_devclass;
|
|
|
|
EARLY_DRIVER_MODULE(wdt, simplebus, aml8726_wdt_driver, aml8726_wdt_devclass,
|
|
0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE);
|
|
|
|
void
|
|
cpu_reset(void)
|
|
{
|
|
|
|
/* Watchdog has not yet been initialized */
|
|
if (aml8726_wdt_sc == NULL)
|
|
printf("Reset hardware has not yet been initialized.\n");
|
|
else {
|
|
CSR_WRITE_4(aml8726_wdt_sc, AML_WDT_RESET_REG, 0);
|
|
CSR_WRITE_4(aml8726_wdt_sc, AML_WDT_CTRL_REG,
|
|
(AML_WDT_CTRL_CPU_WDRESET_MASK | AML_WDT_CTRL_EN |
|
|
(10 << AML_WDT_CTRL_TERMINAL_CNT_SHIFT)));
|
|
}
|
|
|
|
while (1);
|
|
}
|