1 /* $OpenBSD: omsysc.c,v 1.1 2020/04/10 22:02:45 kettenis Exp $ */ 2 /* 3 * Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org> 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/fdt.h> 23 24 #include <dev/ofw/openfirm.h> 25 #include <dev/ofw/ofw_clock.h> 26 #include <dev/ofw/fdt.h> 27 28 #include <arm/simplebus/simplebusvar.h> 29 30 struct omsysc_softc { 31 struct simplebus_softc sc_bus; 32 }; 33 34 int omsysc_match(struct device *, void *, void *); 35 void omsysc_attach(struct device *, struct device *, void *); 36 37 struct cfattach omsysc_ca = { 38 sizeof(struct omsysc_softc), omsysc_match, omsysc_attach 39 }; 40 41 struct cfdriver omsysc_cd = { 42 NULL, "omsysc", DV_DULL 43 }; 44 45 int 46 omsysc_match(struct device *parent, void *cfdata, void *aux) 47 { 48 struct fdt_attach_args *faa = aux; 49 struct cfdata *cf = cfdata; 50 int node; 51 52 /* 53 * On AM33xx we need to make sure we attach the PRCM and SCM 54 * modules since they provide clock and pinctrl for other 55 * hardware modules. Therefore we attach those during the 56 * "early" phase. 57 */ 58 node = OF_child(faa->fa_node); 59 if (node && cf->cf_loc[0]) { 60 return (OF_is_compatible(node, "ti,am3-prcm") || 61 OF_is_compatible(node, "ti,am3-scm")); 62 } 63 64 return OF_is_compatible(faa->fa_node, "ti,sysc"); 65 } 66 67 void 68 omsysc_attach(struct device *parent, struct device *self, void *aux) 69 { 70 struct omsysc_softc *sc = (struct omsysc_softc *)self; 71 struct fdt_attach_args *faa = aux; 72 73 if (OF_getproplen(faa->fa_node, "ti,hwmods") < 0 && 74 OF_is_compatible(faa->fa_node, "ti,sysc-omap2")) 75 clock_enable(faa->fa_node, "fck"); 76 77 simplebus_attach(parent, &sc->sc_bus.sc_dev, faa); 78 } 79