1 /* $OpenBSD: pmc.c,v 1.3 2012/10/17 22:32:01 deraadt 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_wdog_cb(void *, int); 54 55 struct cfattach pmc_ca = { 56 sizeof(struct pmc_softc), pmc_match, pmc_attach 57 }; 58 59 struct cfdriver pmc_cd = { 60 NULL, "pmc", DV_DULL 61 }; 62 63 int 64 pmc_match(struct device *parent, void *cf, void *aux) 65 { 66 struct ebus_attach_args *ea = aux; 67 68 if (strcmp("pmc", ea->ea_name) == 0) 69 return (1); 70 return (0); 71 } 72 73 void 74 pmc_attach(struct device *parent, struct device *self, void *aux) 75 { 76 struct pmc_softc *sc = (void *)self; 77 struct ebus_attach_args *ea = aux; 78 79 /* Use prom address if available, otherwise map it. */ 80 if (ea->ea_nvaddrs) { 81 if (bus_space_map(ea->ea_memtag, ea->ea_vaddrs[0], 0, 82 BUS_SPACE_MAP_PROMADDRESS, &sc->sc_ioh)) { 83 printf(": can't map PROM register space\n"); 84 return; 85 } 86 sc->sc_iot = ea->ea_memtag; 87 } else if (ebus_bus_map(ea->ea_iotag, 0, 88 EBUS_PADDR_FROM_REG(&ea->ea_regs[0]), 89 ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) { 90 sc->sc_iot = ea->ea_iotag; 91 } else if (ebus_bus_map(ea->ea_memtag, 0, 92 EBUS_PADDR_FROM_REG(&ea->ea_regs[0]), 93 ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) { 94 sc->sc_iot = ea->ea_memtag; 95 } else { 96 printf(": can't map register space\n"); 97 return; 98 } 99 100 printf("\n"); 101 102 wdog_register(pmc_wdog_cb, sc); 103 } 104 105 int 106 pmc_wdog_cb(void *arg, int period) 107 { 108 struct pmc_softc *sc = arg; 109 int mins; 110 111 mins = (period + 59) / 60; 112 if (mins > 255) 113 mins = 255; 114 115 bus_space_write_1(sc->sc_iot, sc->sc_ioh, PMC_ADDR, PMC_WDTO); 116 bus_space_write_1(sc->sc_iot, sc->sc_ioh, PMC_DATA, mins); 117 118 return (mins * 60); 119 } 120