1 /* $OpenBSD: syscon.c,v 1.2 2017/09/19 15:37:47 patrick Exp $ */ 2 /* 3 * Copyright (c) 2017 Mark Kettenis 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 22 #include <machine/bus.h> 23 #include <machine/fdt.h> 24 25 #include <dev/ofw/openfirm.h> 26 #include <dev/ofw/ofw_misc.h> 27 #include <dev/ofw/fdt.h> 28 29 extern void (*cpuresetfn)(void); 30 extern void (*powerdownfn)(void); 31 32 struct syscon_softc { 33 struct device sc_dev; 34 bus_space_tag_t sc_iot; 35 bus_space_handle_t sc_ioh; 36 uint32_t sc_regmap; 37 bus_size_t sc_offset; 38 uint32_t sc_mask; 39 }; 40 41 struct syscon_softc *syscon_reboot_sc; 42 struct syscon_softc *syscon_poweroff_sc; 43 44 int syscon_match(struct device *, void *, void *); 45 void syscon_attach(struct device *, struct device *, void *); 46 47 struct cfattach syscon_ca = { 48 sizeof(struct syscon_softc), syscon_match, syscon_attach 49 }; 50 51 struct cfdriver syscon_cd = { 52 NULL, "syscon", DV_DULL 53 }; 54 55 void syscon_reset(void); 56 void syscon_powerdown(void); 57 58 int 59 syscon_match(struct device *parent, void *match, void *aux) 60 { 61 struct fdt_attach_args *faa = aux; 62 63 return OF_is_compatible(faa->fa_node, "syscon") || 64 OF_is_compatible(faa->fa_node, "syscon-reboot") || 65 OF_is_compatible(faa->fa_node, "syscon-poweroff"); 66 } 67 68 void 69 syscon_attach(struct device *parent, struct device *self, void *aux) 70 { 71 struct syscon_softc *sc = (struct syscon_softc *)self; 72 struct fdt_attach_args *faa = aux; 73 74 if (OF_is_compatible(faa->fa_node, "syscon")) { 75 if (faa->fa_nreg < 1) { 76 printf(": no registers\n"); 77 return; 78 } 79 80 sc->sc_iot = faa->fa_iot; 81 82 if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, 83 faa->fa_reg[0].size, 0, &sc->sc_ioh)) { 84 printf(": can't map registers\n"); 85 return; 86 } 87 88 regmap_register(faa->fa_node, sc->sc_iot, sc->sc_ioh, 89 faa->fa_reg[0].size); 90 printf("\n"); 91 } 92 93 if (OF_is_compatible(faa->fa_node, "syscon-reboot") || 94 OF_is_compatible(faa->fa_node, "syscon-poweroff")) { 95 printf("\n"); 96 97 sc->sc_regmap = OF_getpropint(faa->fa_node, "regmap", 0); 98 if (sc->sc_regmap == 0) 99 return; 100 101 if (OF_getproplen(faa->fa_node, "offset") != sizeof(uint32_t) || 102 OF_getproplen(faa->fa_node, "mask") != sizeof(uint32_t)) 103 return; 104 105 sc->sc_offset = OF_getpropint(faa->fa_node, "offset", 0); 106 sc->sc_mask = OF_getpropint(faa->fa_node, "mask", 0); 107 108 if (OF_is_compatible(faa->fa_node, "syscon-reboot")) { 109 syscon_reboot_sc = sc; 110 cpuresetfn = syscon_reset; 111 } else if (OF_is_compatible(faa->fa_node, "syscon-poweroff")) { 112 syscon_poweroff_sc = sc; 113 powerdownfn = syscon_powerdown; 114 } 115 } 116 } 117 118 void 119 syscon_reset(void) 120 { 121 struct syscon_softc *sc = syscon_reboot_sc; 122 struct regmap *rm; 123 124 rm = regmap_byphandle(sc->sc_regmap); 125 if (rm == NULL) 126 return; 127 128 regmap_write_4(rm, sc->sc_offset, sc->sc_mask); 129 delay(1000000); 130 } 131 132 void 133 syscon_powerdown(void) 134 { 135 struct syscon_softc *sc = syscon_poweroff_sc; 136 struct regmap *rm; 137 138 rm = regmap_byphandle(sc->sc_regmap); 139 if (rm == NULL) 140 return; 141 142 regmap_write_4(rm, sc->sc_offset, sc->sc_mask); 143 delay(1000000); 144 } 145