1 /* $OpenBSD: mvdog.c,v 1.2 2021/10/24 17:52:26 mpi Exp $ */ 2 /* 3 * Copyright (c) 2019 Patrick Wildt <patrick@blueri.se> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/param.h> 19 #include <sys/systm.h> 20 #include <sys/device.h> 21 #include <machine/bus.h> 22 #include <machine/fdt.h> 23 24 #include <dev/ofw/openfirm.h> 25 #include <dev/ofw/ofw_misc.h> 26 #include <dev/ofw/fdt.h> 27 28 #define CNTR_RETRIGGER 0 29 #define CNTR_WDOG 1 30 31 #define CNTR_CTRL(x) ((x) * 0x10) 32 #define CNTR_CTRL_ENABLE (1 << 0) 33 34 #define WDT_TIMER_SELECT 0x64 35 36 #define HREAD4(sc, reg) \ 37 (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))) 38 #define HWRITE4(sc, reg, val) \ 39 bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) 40 #define HSET4(sc, reg, bits) \ 41 HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits)) 42 #define HCLR4(sc, reg, bits) \ 43 HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits)) 44 45 struct mvdog_softc { 46 struct device sc_dev; 47 bus_space_tag_t sc_iot; 48 bus_space_handle_t sc_ioh; 49 struct regmap *sc_rm; 50 }; 51 52 int mvdog_match(struct device *, void *, void *); 53 void mvdog_attach(struct device *, struct device *, void *); 54 55 const struct cfattach mvdog_ca = { 56 sizeof (struct mvdog_softc), mvdog_match, mvdog_attach 57 }; 58 59 struct cfdriver mvdog_cd = { 60 NULL, "mvdog", DV_DULL 61 }; 62 63 int 64 mvdog_match(struct device *parent, void *cfdata, void *aux) 65 { 66 struct fdt_attach_args *faa = aux; 67 68 return OF_is_compatible(faa->fa_node, "marvell,armada-3700-wdt"); 69 } 70 71 void 72 mvdog_attach(struct device *parent, struct device *self, void *aux) 73 { 74 struct mvdog_softc *sc = (struct mvdog_softc *)self; 75 struct fdt_attach_args *faa = aux; 76 77 if (faa->fa_nreg < 1) { 78 printf(": no registers\n"); 79 return; 80 } 81 82 sc->sc_iot = faa->fa_iot; 83 if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, 84 faa->fa_reg[0].size, 0, &sc->sc_ioh)) { 85 printf(": can't map registers\n"); 86 return; 87 } 88 89 sc->sc_rm = regmap_byphandle(OF_getpropint(faa->fa_node, 90 "marvell,system-controller", 0)); 91 if (sc->sc_rm == NULL) { 92 printf(": can't get regmap\n"); 93 return; 94 } 95 96 printf("\n"); 97 98 /* Disable watchdog timer. */ 99 HCLR4(sc, CNTR_CTRL(CNTR_WDOG), CNTR_CTRL_ENABLE); 100 HCLR4(sc, CNTR_CTRL(CNTR_RETRIGGER), CNTR_CTRL_ENABLE); 101 regmap_write_4(sc->sc_rm, WDT_TIMER_SELECT, 0); 102 } 103