aml8726_wdt.c revision 314506
1241519Sattilio/*- 2241519Sattilio * Copyright 2013-2015 John Wehle <john@feith.com> 3241519Sattilio * All rights reserved. 4241519Sattilio * 5241519Sattilio * Redistribution and use in source and binary forms, with or without 6241519Sattilio * modification, are permitted provided that the following conditions 7241519Sattilio * are met: 8241519Sattilio * 1. Redistributions of source code must retain the above copyright 9241519Sattilio * notice, this list of conditions and the following disclaimer. 10241519Sattilio * 2. Redistributions in binary form must reproduce the above copyright 11241519Sattilio * notice, this list of conditions and the following disclaimer in the 12241519Sattilio * documentation and/or other materials provided with the distribution. 13241519Sattilio * 14241519Sattilio * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15241519Sattilio * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16241519Sattilio * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17241519Sattilio * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18241519Sattilio * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19241519Sattilio * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20241519Sattilio * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21241519Sattilio * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22241519Sattilio * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23241519Sattilio * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24241519Sattilio * SUCH DAMAGE. 25241519Sattilio * 26241519Sattilio */ 27241519Sattilio 28241519Sattilio/* 29241519Sattilio * Amlogic aml8726 watchdog driver. 30241519Sattilio */ 31241519Sattilio 32241519Sattilio#include <sys/cdefs.h> 33241519Sattilio__FBSDID("$FreeBSD: stable/11/sys/arm/amlogic/aml8726/aml8726_wdt.c 314506 2017-03-01 19:55:04Z ian $"); 34241519Sattilio 35241519Sattilio#include <sys/param.h> 36241519Sattilio#include <sys/systm.h> 37241519Sattilio#include <sys/bus.h> 38241519Sattilio#include <sys/kernel.h> 39241519Sattilio#include <sys/module.h> 40241519Sattilio#include <sys/malloc.h> 41241519Sattilio#include <sys/rman.h> 42241519Sattilio 43241519Sattilio#include <sys/watchdog.h> 44241519Sattilio 45241519Sattilio#include <machine/bus.h> 46241519Sattilio 47241519Sattilio#include <dev/fdt/fdt_common.h> 48241519Sattilio#include <dev/ofw/ofw_bus.h> 49241519Sattilio#include <dev/ofw/ofw_bus_subr.h> 50241519Sattilio 51241519Sattilio#include <arm/amlogic/aml8726/aml8726_soc.h> 52241519Sattilio 53241519Sattilio 54241519Sattiliostruct aml8726_wdt_softc { 55241519Sattilio device_t dev; 56241519Sattilio struct resource * res[2]; 57241519Sattilio struct mtx mtx; 58241519Sattilio void * ih_cookie; 59241519Sattilio}; 60241519Sattilio 61241519Sattiliostatic struct resource_spec aml8726_wdt_spec[] = { 62241519Sattilio { SYS_RES_MEMORY, 0, RF_ACTIVE }, 63241519Sattilio { SYS_RES_IRQ, 0, RF_ACTIVE }, 64241519Sattilio { -1, 0 } 65241519Sattilio}; 66241519Sattilio 67241519Sattiliostatic struct { 68241519Sattilio uint32_t ctrl_cpu_mask; 69241519Sattilio uint32_t ctrl_en; 70241519Sattilio uint32_t term_cnt_mask; 71241519Sattilio uint32_t reset_cnt_mask; 72241519Sattilio} aml8726_wdt_soc_params; 73241519Sattilio 74241519Sattilio/* 75241519Sattilio * devclass_get_device / device_get_softc could be used 76241519Sattilio * to dynamically locate this, however the wdt is a 77241519Sattilio * required device which can't be unloaded so there's 78241519Sattilio * no need for the overhead. 79241519Sattilio */ 80241519Sattiliostatic struct aml8726_wdt_softc *aml8726_wdt_sc = NULL; 81241519Sattilio 82241519Sattilio#define AML_WDT_LOCK(sc) mtx_lock_spin(&(sc)->mtx) 83241519Sattilio#define AML_WDT_UNLOCK(sc) mtx_unlock_spin(&(sc)->mtx) 84241519Sattilio#define AML_WDT_LOCK_INIT(sc) \ 85241519Sattilio mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \ 86241519Sattilio "wdt", MTX_SPIN) 87241519Sattilio#define AML_WDT_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx); 88241519Sattilio 89241519Sattilio#define AML_WDT_CTRL_REG 0 90241519Sattilio#define AML_WDT_CTRL_CPU_WDRESET_MASK aml8726_wdt_soc_params.ctrl_cpu_mask 91241519Sattilio#define AML_WDT_CTRL_CPU_WDRESET_SHIFT 24 92241519Sattilio#define AML_WDT_CTRL_IRQ_EN (1 << 23) 93241519Sattilio#define AML_WDT_CTRL_EN aml8726_wdt_soc_params.ctrl_en 94241519Sattilio#define AML_WDT_CTRL_TERMINAL_CNT_MASK aml8726_wdt_soc_params.term_cnt_mask 95241519Sattilio#define AML_WDT_CTRL_TERMINAL_CNT_SHIFT 0 96241519Sattilio#define AML_WDT_RESET_REG 4 97241519Sattilio#define AML_WDT_RESET_CNT_MASK aml8726_wdt_soc_params.reset_cnt_mask 98241519Sattilio#define AML_WDT_RESET_CNT_SHIFT 0 99241519Sattilio 100241519Sattilio#define CSR_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val)) 101241519Sattilio#define CSR_READ_4(sc, reg) bus_read_4((sc)->res[0], reg) 102241519Sattilio#define CSR_BARRIER(sc, reg) bus_barrier((sc)->res[0], reg, 4, \ 103241519Sattilio (BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE)) 104241519Sattilio 105241519Sattiliostatic void 106241519Sattilioaml8726_wdt_watchdog(void *private, u_int cmd, int *error) 107241519Sattilio{ 108241519Sattilio struct aml8726_wdt_softc *sc = (struct aml8726_wdt_softc *)private; 109241519Sattilio uint32_t wcr; 110241519Sattilio uint64_t tens_of_usec; 111241519Sattilio 112241519Sattilio AML_WDT_LOCK(sc); 113241519Sattilio 114241519Sattilio tens_of_usec = (((uint64_t)1 << (cmd & WD_INTERVAL)) + 9999) / 10000; 115241519Sattilio 116241519Sattilio if (cmd != 0 && tens_of_usec <= (AML_WDT_CTRL_TERMINAL_CNT_MASK >> 117241519Sattilio AML_WDT_CTRL_TERMINAL_CNT_SHIFT)) { 118241519Sattilio 119241519Sattilio wcr = AML_WDT_CTRL_CPU_WDRESET_MASK | 120241519Sattilio AML_WDT_CTRL_EN | ((uint32_t)tens_of_usec << 121241519Sattilio AML_WDT_CTRL_TERMINAL_CNT_SHIFT); 122241519Sattilio 123241519Sattilio CSR_WRITE_4(sc, AML_WDT_RESET_REG, 0); 124241519Sattilio CSR_WRITE_4(sc, AML_WDT_CTRL_REG, wcr); 125241519Sattilio 126241519Sattilio *error = 0; 127241519Sattilio } else 128241519Sattilio CSR_WRITE_4(sc, AML_WDT_CTRL_REG, 129241519Sattilio (CSR_READ_4(sc, AML_WDT_CTRL_REG) & 130241519Sattilio ~(AML_WDT_CTRL_IRQ_EN | AML_WDT_CTRL_EN))); 131241519Sattilio 132241519Sattilio AML_WDT_UNLOCK(sc); 133241519Sattilio} 134241519Sattilio 135241519Sattiliostatic int 136241519Sattilioaml8726_wdt_intr(void *arg) 137241519Sattilio{ 138241519Sattilio struct aml8726_wdt_softc *sc = (struct aml8726_wdt_softc *)arg; 139241519Sattilio 140241519Sattilio /* 141241519Sattilio * Normally a timeout causes a hardware reset, however 142241519Sattilio * the watchdog timer can be configured to cause an 143241519Sattilio * interrupt instead by setting AML_WDT_CTRL_IRQ_EN 144241519Sattilio * and clearing AML_WDT_CTRL_CPU_WDRESET_MASK. 145241519Sattilio */ 146241519Sattilio 147241519Sattilio AML_WDT_LOCK(sc); 148241519Sattilio 149241519Sattilio CSR_WRITE_4(sc, AML_WDT_CTRL_REG, 150241519Sattilio (CSR_READ_4(sc, AML_WDT_CTRL_REG) & ~(AML_WDT_CTRL_IRQ_EN | 151241519Sattilio AML_WDT_CTRL_EN))); 152241519Sattilio 153241519Sattilio CSR_BARRIER(sc, AML_WDT_CTRL_REG); 154241519Sattilio 155241519Sattilio AML_WDT_UNLOCK(sc); 156241519Sattilio 157241519Sattilio device_printf(sc->dev, "timeout expired\n"); 158241519Sattilio 159241519Sattilio return (FILTER_HANDLED); 160241519Sattilio} 161241519Sattilio 162241519Sattiliostatic int 163241519Sattilioaml8726_wdt_probe(device_t dev) 164241519Sattilio{ 165241519Sattilio 166241519Sattilio if (!ofw_bus_status_okay(dev)) 167241519Sattilio return (ENXIO); 168241519Sattilio 169241519Sattilio if (!ofw_bus_is_compatible(dev, "amlogic,meson6-wdt")) 170241519Sattilio return (ENXIO); 171241519Sattilio 172241519Sattilio device_set_desc(dev, "Amlogic aml8726 WDT"); 173241519Sattilio 174241519Sattilio return (BUS_PROBE_DEFAULT); 175241519Sattilio} 176241519Sattilio 177241519Sattiliostatic int 178241519Sattilioaml8726_wdt_attach(device_t dev) 179241519Sattilio{ 180241519Sattilio struct aml8726_wdt_softc *sc = device_get_softc(dev); 181241519Sattilio 182241519Sattilio /* There should be exactly one instance. */ 183241519Sattilio if (aml8726_wdt_sc != NULL) 184241519Sattilio return (ENXIO); 185241519Sattilio 186241519Sattilio sc->dev = dev; 187241519Sattilio 188241519Sattilio if (bus_alloc_resources(dev, aml8726_wdt_spec, sc->res)) { 189241519Sattilio device_printf(dev, "can not allocate resources for device\n"); 190241519Sattilio return (ENXIO); 191241519Sattilio } 192241519Sattilio 193241519Sattilio /* 194241519Sattilio * Certain bitfields are dependent on the hardware revision. 195241519Sattilio */ 196241519Sattilio switch (aml8726_soc_hw_rev) { 197241519Sattilio case AML_SOC_HW_REV_M8: 198241519Sattilio aml8726_wdt_soc_params.ctrl_cpu_mask = 0xf << 199241519Sattilio AML_WDT_CTRL_CPU_WDRESET_SHIFT; 200241519Sattilio switch (aml8726_soc_metal_rev) { 201241519Sattilio case AML_SOC_M8_METAL_REV_M2_A: 202241519Sattilio aml8726_wdt_soc_params.ctrl_en = 1 << 19; 203241519Sattilio aml8726_wdt_soc_params.term_cnt_mask = 0x07ffff << 204241519Sattilio AML_WDT_CTRL_TERMINAL_CNT_SHIFT; 205241519Sattilio aml8726_wdt_soc_params.reset_cnt_mask = 0x07ffff << 206241519Sattilio AML_WDT_RESET_CNT_SHIFT; 207241519Sattilio break; 208241519Sattilio default: 209241519Sattilio aml8726_wdt_soc_params.ctrl_en = 1 << 22; 210241519Sattilio aml8726_wdt_soc_params.term_cnt_mask = 0x3fffff << 211241519Sattilio AML_WDT_CTRL_TERMINAL_CNT_SHIFT; 212241519Sattilio aml8726_wdt_soc_params.reset_cnt_mask = 0x3fffff << 213241519Sattilio AML_WDT_RESET_CNT_SHIFT; 214241519Sattilio break; 215241519Sattilio } 216241519Sattilio break; 217241519Sattilio case AML_SOC_HW_REV_M8B: 218241519Sattilio aml8726_wdt_soc_params.ctrl_cpu_mask = 0xf << 219241519Sattilio AML_WDT_CTRL_CPU_WDRESET_SHIFT; 220241519Sattilio aml8726_wdt_soc_params.ctrl_en = 1 << 19; 221241519Sattilio aml8726_wdt_soc_params.term_cnt_mask = 0x07ffff << 222241519Sattilio AML_WDT_CTRL_TERMINAL_CNT_SHIFT; 223241519Sattilio aml8726_wdt_soc_params.reset_cnt_mask = 0x07ffff << 224241519Sattilio AML_WDT_RESET_CNT_SHIFT; 225241519Sattilio break; 226241519Sattilio default: 227241519Sattilio aml8726_wdt_soc_params.ctrl_cpu_mask = 3 << 228241519Sattilio AML_WDT_CTRL_CPU_WDRESET_SHIFT; 229241519Sattilio aml8726_wdt_soc_params.ctrl_en = 1 << 22; 230241519Sattilio aml8726_wdt_soc_params.term_cnt_mask = 0x3fffff << 231241519Sattilio AML_WDT_CTRL_TERMINAL_CNT_SHIFT; 232241519Sattilio aml8726_wdt_soc_params.reset_cnt_mask = 0x3fffff << 233241519Sattilio AML_WDT_RESET_CNT_SHIFT; 234241519Sattilio break; 235241519Sattilio } 236241519Sattilio 237241519Sattilio /* 238241519Sattilio * Disable the watchdog. 239241519Sattilio */ 240241519Sattilio CSR_WRITE_4(sc, AML_WDT_CTRL_REG, 241241519Sattilio (CSR_READ_4(sc, AML_WDT_CTRL_REG) & ~(AML_WDT_CTRL_IRQ_EN | 242241519Sattilio AML_WDT_CTRL_EN))); 243241519Sattilio 244241519Sattilio /* 245241519Sattilio * Initialize the mutex prior to installing the interrupt handler 246241519Sattilio * in case of a spurious interrupt. 247241519Sattilio */ 248241519Sattilio AML_WDT_LOCK_INIT(sc); 249241521Sattilio 250241519Sattilio if (bus_setup_intr(dev, sc->res[1], INTR_TYPE_MISC | INTR_MPSAFE, 251241519Sattilio aml8726_wdt_intr, NULL, sc, &sc->ih_cookie)) { 252241519Sattilio device_printf(dev, "could not setup interrupt handler\n"); 253241519Sattilio bus_release_resources(dev, aml8726_wdt_spec, sc->res); 254241519Sattilio AML_WDT_LOCK_DESTROY(sc); 255241519Sattilio return (ENXIO); 256241519Sattilio } 257241519Sattilio 258241519Sattilio aml8726_wdt_sc = sc; 259241519Sattilio 260241519Sattilio EVENTHANDLER_REGISTER(watchdog_list, aml8726_wdt_watchdog, sc, 0); 261241519Sattilio 262241519Sattilio return (0); 263241519Sattilio} 264241519Sattilio 265241519Sattiliostatic int 266241519Sattilioaml8726_wdt_detach(device_t dev) 267241519Sattilio{ 268241521Sattilio 269241519Sattilio return (EBUSY); 270241519Sattilio} 271241519Sattilio 272241519Sattiliostatic device_method_t aml8726_wdt_methods[] = { 273241519Sattilio /* Device interface */ 274241519Sattilio DEVMETHOD(device_probe, aml8726_wdt_probe), 275241519Sattilio DEVMETHOD(device_attach, aml8726_wdt_attach), 276241519Sattilio DEVMETHOD(device_detach, aml8726_wdt_detach), 277241519Sattilio 278241519Sattilio DEVMETHOD_END 279241519Sattilio}; 280241519Sattilio 281241519Sattiliostatic driver_t aml8726_wdt_driver = { 282241519Sattilio "wdt", 283241519Sattilio aml8726_wdt_methods, 284241519Sattilio sizeof(struct aml8726_wdt_softc), 285241519Sattilio}; 286241519Sattilio 287241519Sattiliostatic devclass_t aml8726_wdt_devclass; 288241519Sattilio 289241519SattilioEARLY_DRIVER_MODULE(wdt, simplebus, aml8726_wdt_driver, aml8726_wdt_devclass, 290241519Sattilio 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE); 291241519Sattilio 292241519Sattiliovoid 293241519Sattiliocpu_reset(void) 294241519Sattilio{ 295241519Sattilio 296241519Sattilio /* Watchdog has not yet been initialized */ 297241519Sattilio if (aml8726_wdt_sc == NULL) 298241519Sattilio printf("Reset hardware has not yet been initialized.\n"); 299241519Sattilio else { 300241519Sattilio CSR_WRITE_4(aml8726_wdt_sc, AML_WDT_RESET_REG, 0); 301241519Sattilio CSR_WRITE_4(aml8726_wdt_sc, AML_WDT_CTRL_REG, 302241519Sattilio (AML_WDT_CTRL_CPU_WDRESET_MASK | AML_WDT_CTRL_EN | 303241519Sattilio (10 << AML_WDT_CTRL_TERMINAL_CNT_SHIFT))); 304241519Sattilio } 305241519Sattilio 306241519Sattilio while (1); 307241519Sattilio} 308241519Sattilio