/* $OpenBSD: mvagc.c,v 1.2 2021/10/24 17:52:27 mpi Exp $ */ /* * Copyright (c) 2016 Patrick Wildt * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #define HREAD4(sc, reg) \ (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))) #define HWRITE4(sc, reg, val) \ bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) #define HSET4(sc, reg, bits) \ HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits)) #define HCLR4(sc, reg, bits) \ HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits)) struct mvagc_softc { struct device sc_dev; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; int sc_node; struct clock_device sc_cd; }; int mvagc_match(struct device *, void *, void *); void mvagc_attach(struct device *, struct device *, void *); void mvagc_enable(void *, uint32_t *, int); uint32_t mvagc_gen_get_frequency(void *, uint32_t *); const struct cfattach mvagc_ca = { sizeof (struct mvagc_softc), mvagc_match, mvagc_attach }; struct cfdriver mvagc_cd = { NULL, "mvagc", DV_DULL }; int mvagc_match(struct device *parent, void *cfdata, void *aux) { struct fdt_attach_args *faa = aux; return (OF_is_compatible(faa->fa_node, "marvell,armada-380-gating-clock")); } void mvagc_attach(struct device *parent, struct device *self, void *args) { struct mvagc_softc *sc = (struct mvagc_softc *)self; struct fdt_attach_args *faa = args; sc->sc_node = faa->fa_node; sc->sc_iot = faa->fa_iot; if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, faa->fa_reg[0].size, 0, &sc->sc_ioh)) panic("%s: bus_space_map failed!", __func__); printf("\n"); sc->sc_cd.cd_node = sc->sc_node; sc->sc_cd.cd_cookie = sc; sc->sc_cd.cd_get_frequency = mvagc_gen_get_frequency; sc->sc_cd.cd_enable = mvagc_enable; clock_register(&sc->sc_cd); } /* * A "generic" function that simply gets the clock frequency from the * parent clock. Useful for clock gating devices that don't scale * their clocks. */ uint32_t mvagc_gen_get_frequency(void *cookie, uint32_t *cells) { struct mvagc_softc *sc = cookie; return clock_get_frequency(sc->sc_node, NULL); } void mvagc_enable(void *cookie, uint32_t *cells, int on) { struct mvagc_softc *sc = cookie; uint32_t id = cells[0]; if (id >= 32) return; if (on) HSET4(sc, 0, (1 << id)); else HCLR4(sc, 0, (1 << id)); }