aml8726_wdt.c revision 308325
167761Smsmith/*- 280070Smsmith * Copyright 2013-2015 John Wehle <john@feith.com> 367761Smsmith * All rights reserved. 467761Smsmith * 567761Smsmith * Redistribution and use in source and binary forms, with or without 667761Smsmith * modification, are permitted provided that the following conditions 767761Smsmith * are met: 867761Smsmith * 1. Redistributions of source code must retain the above copyright 967761Smsmith * notice, this list of conditions and the following disclaimer. 1067761Smsmith * 2. Redistributions in binary form must reproduce the above copyright 1167761Smsmith * notice, this list of conditions and the following disclaimer in the 1267761Smsmith * documentation and/or other materials provided with the distribution. 1367761Smsmith * 1467761Smsmith * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1567761Smsmith * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1667761Smsmith * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1767761Smsmith * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1867761Smsmith * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1967761Smsmith * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2067761Smsmith * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2167761Smsmith * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2267761Smsmith * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2367761Smsmith * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2467761Smsmith * SUCH DAMAGE. 2567761Smsmith * 2667761Smsmith */ 2767761Smsmith 2867761Smsmith/* 2967761Smsmith * Amlogic aml8726 watchdog driver. 3067761Smsmith */ 3180070Smsmith 3267761Smsmith#include <sys/cdefs.h> 3380070Smsmith__FBSDID("$FreeBSD: stable/11/sys/arm/amlogic/aml8726/aml8726_wdt.c 308325 2016-11-05 04:30:44Z mmel $"); 3480070Smsmith 3567761Smsmith#include <sys/param.h> 3680070Smsmith#include <sys/systm.h> 3780070Smsmith#include <sys/bus.h> 3880070Smsmith#include <sys/kernel.h> 3980070Smsmith#include <sys/module.h> 4080070Smsmith#include <sys/malloc.h> 4167761Smsmith#include <sys/rman.h> 4267761Smsmith 4380070Smsmith#include <sys/watchdog.h> 4480070Smsmith 4567761Smsmith#include <machine/bus.h> 4669744Smsmith 4780070Smsmith#include <dev/fdt/fdt_common.h> 4880070Smsmith#include <dev/ofw/ofw_bus.h> 4980070Smsmith#include <dev/ofw/ofw_bus_subr.h> 5080070Smsmith 5180070Smsmith#include <arm/amlogic/aml8726/aml8726_soc.h> 5280070Smsmith 5369744Smsmith 5469744Smsmithstruct aml8726_wdt_softc { 5577432Smsmith device_t dev; 5691128Smsmith struct resource * res[2]; 5769744Smsmith struct mtx mtx; 5880070Smsmith void * ih_cookie; 5980070Smsmith}; 6080070Smsmith 6180070Smsmithstatic struct resource_spec aml8726_wdt_spec[] = { 6280070Smsmith { SYS_RES_MEMORY, 0, RF_ACTIVE }, 6367761Smsmith { SYS_RES_IRQ, 0, RF_ACTIVE }, 6480070Smsmith { -1, 0 } 6567761Smsmith}; 6667761Smsmith 6767761Smsmithstatic struct { 6867761Smsmith uint32_t ctrl_cpu_mask; 6980070Smsmith uint32_t ctrl_en; 7081096Smsmith uint32_t term_cnt_mask; 7180070Smsmith uint32_t reset_cnt_mask; 7280070Smsmith} aml8726_wdt_soc_params; 7367761Smsmith 7480070Smsmith/* 7580070Smsmith * devclass_get_device / device_get_softc could be used 7680070Smsmith * to dynamically locate this, however the wdt is a 7767761Smsmith * required device which can't be unloaded so there's 7867761Smsmith * no need for the overhead. 7967761Smsmith */ 8067761Smsmithstatic struct aml8726_wdt_softc *aml8726_wdt_sc = NULL; 8167761Smsmith 8267761Smsmith#define AML_WDT_LOCK(sc) mtx_lock_spin(&(sc)->mtx) 8367761Smsmith#define AML_WDT_UNLOCK(sc) mtx_unlock_spin(&(sc)->mtx) 8467761Smsmith#define AML_WDT_LOCK_INIT(sc) \ 8567761Smsmith mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \ 8667761Smsmith "wdt", MTX_SPIN) 8767761Smsmith#define AML_WDT_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx); 8880070Smsmith 8967761Smsmith#define AML_WDT_CTRL_REG 0 9067761Smsmith#define AML_WDT_CTRL_CPU_WDRESET_MASK aml8726_wdt_soc_params.ctrl_cpu_mask 9189054Smsmith#define AML_WDT_CTRL_CPU_WDRESET_SHIFT 24 9267761Smsmith#define AML_WDT_CTRL_IRQ_EN (1 << 23) 9367761Smsmith#define AML_WDT_CTRL_EN aml8726_wdt_soc_params.ctrl_en 9480070Smsmith#define AML_WDT_CTRL_TERMINAL_CNT_MASK aml8726_wdt_soc_params.term_cnt_mask 9580070Smsmith#define AML_WDT_CTRL_TERMINAL_CNT_SHIFT 0 9680070Smsmith#define AML_WDT_RESET_REG 4 9780070Smsmith#define AML_WDT_RESET_CNT_MASK aml8726_wdt_soc_params.reset_cnt_mask 9881096Smsmith#define AML_WDT_RESET_CNT_SHIFT 0 9980070Smsmith 10080070Smsmith#define CSR_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val)) 10180070Smsmith#define CSR_READ_4(sc, reg) bus_read_4((sc)->res[0], reg) 10280070Smsmith#define CSR_BARRIER(sc, reg) bus_barrier((sc)->res[0], reg, 4, \ 10380070Smsmith (BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE)) 10480070Smsmith 10580070Smsmithstatic void 10680070Smsmithaml8726_wdt_watchdog(void *private, u_int cmd, int *error) 10791237Sphk{ 10880070Smsmith struct aml8726_wdt_softc *sc = (struct aml8726_wdt_softc *)private; 10991237Sphk uint32_t wcr; 11091237Sphk uint64_t tens_of_usec; 11191237Sphk 11291237Sphk AML_WDT_LOCK(sc); 11391237Sphk 11491237Sphk tens_of_usec = (((uint64_t)1 << (cmd & WD_INTERVAL)) + 9999) / 10000; 11591237Sphk 11691237Sphk if (cmd != 0 && tens_of_usec <= (AML_WDT_CTRL_TERMINAL_CNT_MASK >> 11791237Sphk AML_WDT_CTRL_TERMINAL_CNT_SHIFT)) { 11891237Sphk 11991237Sphk wcr = AML_WDT_CTRL_CPU_WDRESET_MASK | 12091237Sphk AML_WDT_CTRL_EN | ((uint32_t)tens_of_usec << 12191237Sphk AML_WDT_CTRL_TERMINAL_CNT_SHIFT); 12291237Sphk 12391237Sphk CSR_WRITE_4(sc, AML_WDT_RESET_REG, 0); 12491237Sphk CSR_WRITE_4(sc, AML_WDT_CTRL_REG, wcr); 12591237Sphk 12691237Sphk *error = 0; 12791237Sphk } else 12891237Sphk CSR_WRITE_4(sc, AML_WDT_CTRL_REG, 12991237Sphk (CSR_READ_4(sc, AML_WDT_CTRL_REG) & 13091237Sphk ~(AML_WDT_CTRL_IRQ_EN | AML_WDT_CTRL_EN))); 13191237Sphk 13291237Sphk AML_WDT_UNLOCK(sc); 13391237Sphk} 13493093Sphk 13593093Sphkstatic int 13693093Sphkaml8726_wdt_intr(void *arg) 13793093Sphk{ 13891237Sphk struct aml8726_wdt_softc *sc = (struct aml8726_wdt_softc *)arg; 13991237Sphk 14091237Sphk /* 14180070Smsmith * Normally a timeout causes a hardware reset, however 14280070Smsmith * the watchdog timer can be configured to cause an 14380070Smsmith * interrupt instead by setting AML_WDT_CTRL_IRQ_EN 14480070Smsmith * and clearing AML_WDT_CTRL_CPU_WDRESET_MASK. 14567761Smsmith */ 14667761Smsmith 14767761Smsmith AML_WDT_LOCK(sc); 14880070Smsmith 14980070Smsmith CSR_WRITE_4(sc, AML_WDT_CTRL_REG, 15091237Sphk (CSR_READ_4(sc, AML_WDT_CTRL_REG) & ~(AML_WDT_CTRL_IRQ_EN | 15167761Smsmith AML_WDT_CTRL_EN))); 15291128Smsmith 15369744Smsmith CSR_BARRIER(sc, AML_WDT_CTRL_REG); 15469744Smsmith 15569744Smsmith AML_WDT_UNLOCK(sc); 15669744Smsmith 15771872Smsmith device_printf(sc->dev, "timeout expired\n"); 15869744Smsmith 15971872Smsmith return (FILTER_HANDLED); 16067761Smsmith} 16167761Smsmith 16269744Smsmithstatic int 16367761Smsmithaml8726_wdt_probe(device_t dev) 16480070Smsmith{ 16580070Smsmith 16680070Smsmith if (!ofw_bus_status_okay(dev)) 16780070Smsmith return (ENXIO); 16880070Smsmith 16969744Smsmith if (!ofw_bus_is_compatible(dev, "amlogic,meson6-wdt")) 17067761Smsmith return (ENXIO); 17180070Smsmith 17280070Smsmith device_set_desc(dev, "Amlogic aml8726 WDT"); 17367761Smsmith 17480070Smsmith return (BUS_PROBE_DEFAULT); 17591237Sphk} 17691237Sphk 17791237Sphkstatic int 17891237Sphkaml8726_wdt_attach(device_t dev) 17991237Sphk{ 18091237Sphk struct aml8726_wdt_softc *sc = device_get_softc(dev); 18191237Sphk 18291237Sphk /* There should be exactly one instance. */ 18391237Sphk if (aml8726_wdt_sc != NULL) 18491237Sphk return (ENXIO); 18580070Smsmith 18680070Smsmith sc->dev = dev; 18771872Smsmith 18867761Smsmith if (bus_alloc_resources(dev, aml8726_wdt_spec, sc->res)) { 18969744Smsmith device_printf(dev, "can not allocate resources for device\n"); 19069744Smsmith return (ENXIO); 19167761Smsmith } 19267761Smsmith 19367761Smsmith /* 19467761Smsmith * Certain bitfields are dependent on the hardware revision. 19567761Smsmith */ 19680070Smsmith switch (aml8726_soc_hw_rev) { 19767761Smsmith case AML_SOC_HW_REV_M8: 19867761Smsmith aml8726_wdt_soc_params.ctrl_cpu_mask = 0xf << 19967761Smsmith AML_WDT_CTRL_CPU_WDRESET_SHIFT; 20067761Smsmith switch (aml8726_soc_metal_rev) { 20167761Smsmith case AML_SOC_M8_METAL_REV_M2_A: 20267761Smsmith aml8726_wdt_soc_params.ctrl_en = 1 << 19; 20367761Smsmith aml8726_wdt_soc_params.term_cnt_mask = 0x07ffff << 20480070Smsmith AML_WDT_CTRL_TERMINAL_CNT_SHIFT; 20580070Smsmith aml8726_wdt_soc_params.reset_cnt_mask = 0x07ffff << 20667761Smsmith AML_WDT_RESET_CNT_SHIFT; 20780070Smsmith break; 20881096Smsmith default: 20980070Smsmith aml8726_wdt_soc_params.ctrl_en = 1 << 22; 21080070Smsmith aml8726_wdt_soc_params.term_cnt_mask = 0x3fffff << 21180070Smsmith AML_WDT_CTRL_TERMINAL_CNT_SHIFT; 21280070Smsmith aml8726_wdt_soc_params.reset_cnt_mask = 0x3fffff << 21380602Smsmith AML_WDT_RESET_CNT_SHIFT; 21467761Smsmith break; 21580070Smsmith } 21680070Smsmith break; 21781096Smsmith case AML_SOC_HW_REV_M8B: 21881096Smsmith aml8726_wdt_soc_params.ctrl_cpu_mask = 0xf << 21981096Smsmith AML_WDT_CTRL_CPU_WDRESET_SHIFT; 22081096Smsmith aml8726_wdt_soc_params.ctrl_en = 1 << 19; 22181096Smsmith aml8726_wdt_soc_params.term_cnt_mask = 0x07ffff << 22281096Smsmith AML_WDT_CTRL_TERMINAL_CNT_SHIFT; 22381096Smsmith aml8726_wdt_soc_params.reset_cnt_mask = 0x07ffff << 22481096Smsmith AML_WDT_RESET_CNT_SHIFT; 22581096Smsmith break; 22681096Smsmith default: 22781096Smsmith aml8726_wdt_soc_params.ctrl_cpu_mask = 3 << 22881096Smsmith AML_WDT_CTRL_CPU_WDRESET_SHIFT; 22981096Smsmith aml8726_wdt_soc_params.ctrl_en = 1 << 22; 23081096Smsmith aml8726_wdt_soc_params.term_cnt_mask = 0x3fffff << 23191237Sphk AML_WDT_CTRL_TERMINAL_CNT_SHIFT; 23281096Smsmith aml8726_wdt_soc_params.reset_cnt_mask = 0x3fffff << 23381096Smsmith AML_WDT_RESET_CNT_SHIFT; 23481096Smsmith break; 23581096Smsmith } 23680070Smsmith 23780070Smsmith /* 23880070Smsmith * Disable the watchdog. 23980070Smsmith */ 24080070Smsmith CSR_WRITE_4(sc, AML_WDT_CTRL_REG, 24180070Smsmith (CSR_READ_4(sc, AML_WDT_CTRL_REG) & ~(AML_WDT_CTRL_IRQ_EN | 24280070Smsmith AML_WDT_CTRL_EN))); 24380070Smsmith 24480070Smsmith /* 24580070Smsmith * Initialize the mutex prior to installing the interrupt handler 24680070Smsmith * in case of a spurious interrupt. 24780070Smsmith */ 24880070Smsmith AML_WDT_LOCK_INIT(sc); 24980070Smsmith 25080070Smsmith if (bus_setup_intr(dev, sc->res[1], INTR_TYPE_MISC | INTR_MPSAFE, 25180070Smsmith aml8726_wdt_intr, NULL, sc, &sc->ih_cookie)) { 25280070Smsmith device_printf(dev, "could not setup interrupt handler\n"); 25380070Smsmith bus_release_resources(dev, aml8726_wdt_spec, sc->res); 25480070Smsmith AML_WDT_LOCK_DESTROY(sc); 25580070Smsmith return (ENXIO); 25680070Smsmith } 25780070Smsmith 25880070Smsmith aml8726_wdt_sc = sc; 25980070Smsmith 26080070Smsmith EVENTHANDLER_REGISTER(watchdog_list, aml8726_wdt_watchdog, sc, 0); 26180070Smsmith 26280070Smsmith return (0); 26380070Smsmith} 26480070Smsmith 26580070Smsmithstatic int 26680070Smsmithaml8726_wdt_detach(device_t dev) 26780070Smsmith{ 26880070Smsmith 26980070Smsmith return (EBUSY); 27080070Smsmith} 27180070Smsmith 27280070Smsmithstatic device_method_t aml8726_wdt_methods[] = { 27380070Smsmith /* Device interface */ 27480070Smsmith DEVMETHOD(device_probe, aml8726_wdt_probe), 27580070Smsmith DEVMETHOD(device_attach, aml8726_wdt_attach), 27680070Smsmith DEVMETHOD(device_detach, aml8726_wdt_detach), 27780070Smsmith 27880070Smsmith DEVMETHOD_END 27980070Smsmith}; 28080070Smsmith 28180070Smsmithstatic driver_t aml8726_wdt_driver = { 28280070Smsmith "wdt", 28380070Smsmith aml8726_wdt_methods, 28480070Smsmith sizeof(struct aml8726_wdt_softc), 28580070Smsmith}; 28680070Smsmith 28780070Smsmithstatic devclass_t aml8726_wdt_devclass; 28880070Smsmith 28980602SmsmithEARLY_DRIVER_MODULE(wdt, simplebus, aml8726_wdt_driver, aml8726_wdt_devclass, 29080602Smsmith 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE); 29180602Smsmith 29281096Smsmithvoid 29381096Smsmithcpu_reset() 29481096Smsmith{ 29581096Smsmith 29681096Smsmith /* Watchdog has not yet been initialized */ 29781096Smsmith if (aml8726_wdt_sc == NULL) 29881096Smsmith printf("Reset hardware has not yet been initialized.\n"); 29981096Smsmith else { 30081096Smsmith CSR_WRITE_4(aml8726_wdt_sc, AML_WDT_RESET_REG, 0); 30181096Smsmith CSR_WRITE_4(aml8726_wdt_sc, AML_WDT_CTRL_REG, 30280602Smsmith (AML_WDT_CTRL_CPU_WDRESET_MASK | AML_WDT_CTRL_EN | 30380602Smsmith (10 << AML_WDT_CTRL_TERMINAL_CNT_SHIFT))); 30480602Smsmith } 30580602Smsmith 30680602Smsmith while (1); 30780602Smsmith} 30880602Smsmith