1 /* $OpenBSD: pmc.c,v 1.5 2021/10/24 17:05:04 mpi Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Mark Kettenis 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* 20 * Driver for watchdog device on Blade 1000, Fire 280R, Fire V480 etc. 21 */ 22 23 #include <sys/param.h> 24 #include <sys/kernel.h> 25 #include <sys/device.h> 26 #include <sys/malloc.h> 27 #include <sys/systm.h> 28 29 #include <machine/bus.h> 30 #include <machine/autoconf.h> 31 32 #include <sparc64/dev/ebusreg.h> 33 #include <sparc64/dev/ebusvar.h> 34 35 /* 36 * Register access is indirect, through an address and data port. 37 */ 38 39 #define PMC_ADDR 0 40 #define PMC_DATA 1 41 42 /* Watchdog time-out register. */ 43 #define PMC_WDTO 0x05 44 45 struct pmc_softc { 46 struct device sc_dv; 47 bus_space_tag_t sc_iot; 48 bus_space_handle_t sc_ioh; 49 }; 50 51 int pmc_match(struct device *, void *, void *); 52 void pmc_attach(struct device *, struct device *, void *); 53 int pmc_activate(struct device *, int); 54 int pmc_wdog_cb(void *, int); 55 56 const struct cfattach pmc_ca = { 57 sizeof(struct pmc_softc), pmc_match, pmc_attach, NULL, pmc_activate 58 }; 59 60 struct cfdriver pmc_cd = { 61 NULL, "pmc", DV_DULL 62 }; 63 64 int 65 pmc_match(struct device *parent, void *cf, void *aux) 66 { 67 struct ebus_attach_args *ea = aux; 68 69 if (strcmp("pmc", ea->ea_name) == 0) 70 return (1); 71 return (0); 72 } 73 74 void 75 pmc_attach(struct device *parent, struct device *self, void *aux) 76 { 77 struct pmc_softc *sc = (void *)self; 78 struct ebus_attach_args *ea = aux; 79 80 /* Use prom address if available, otherwise map it. */ 81 if (ea->ea_nvaddrs) { 82 if (bus_space_map(ea->ea_memtag, ea->ea_vaddrs[0], 0, 83 BUS_SPACE_MAP_PROMADDRESS, &sc->sc_ioh)) { 84 printf(": can't map PROM register space\n"); 85 return; 86 } 87 sc->sc_iot = ea->ea_memtag; 88 } else if (ebus_bus_map(ea->ea_iotag, 0, 89 EBUS_PADDR_FROM_REG(&ea->ea_regs[0]), 90 ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) { 91 sc->sc_iot = ea->ea_iotag; 92 } else if (ebus_bus_map(ea->ea_memtag, 0, 93 EBUS_PADDR_FROM_REG(&ea->ea_regs[0]), 94 ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) { 95 sc->sc_iot = ea->ea_memtag; 96 } else { 97 printf(": can't map register space\n"); 98 return; 99 } 100 101 printf("\n"); 102 103 wdog_register(pmc_wdog_cb, sc); 104 } 105 106 int 107 pmc_activate(struct device *self, int act) 108 { 109 switch (act) { 110 case DVACT_POWERDOWN: 111 wdog_shutdown(self); 112 break; 113 } 114 115 return (0); 116 } 117 118 int 119 pmc_wdog_cb(void *arg, int period) 120 { 121 struct pmc_softc *sc = arg; 122 int mins; 123 124 mins = (period + 59) / 60; 125 if (mins > 255) 126 mins = 255; 127 128 bus_space_write_1(sc->sc_iot, sc->sc_ioh, PMC_ADDR, PMC_WDTO); 129 bus_space_write_1(sc->sc_iot, sc->sc_ioh, PMC_DATA, mins); 130 131 return (mins * 60); 132 } 133