1 /* $OpenBSD: omsysc.c,v 1.4 2023/09/22 01:10:43 jsg 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/device.h>
20
21 #include <machine/fdt.h>
22
23 #include <dev/ofw/openfirm.h>
24 #include <dev/ofw/ofw_clock.h>
25 #include <dev/ofw/fdt.h>
26
27 #include <machine/simplebusvar.h>
28
29 struct omsysc_softc {
30 struct simplebus_softc sc_bus;
31 };
32
33 int omsysc_match(struct device *, void *, void *);
34 void omsysc_attach(struct device *, struct device *, void *);
35
36 const struct cfattach omsysc_ca = {
37 sizeof(struct omsysc_softc), omsysc_match, omsysc_attach
38 };
39
40 struct cfdriver omsysc_cd = {
41 NULL, "omsysc", DV_DULL
42 };
43
44 int
omsysc_match(struct device * parent,void * cfdata,void * aux)45 omsysc_match(struct device *parent, void *cfdata, void *aux)
46 {
47 struct fdt_attach_args *faa = aux;
48 struct cfdata *cf = cfdata;
49 int node;
50
51 /*
52 * On AM33xx we need to make sure we attach the PRCM and SCM
53 * modules since they provide clock and pinctrl for other
54 * hardware modules. Therefore we attach those during the
55 * "early" phase.
56 */
57 node = OF_child(faa->fa_node);
58 if (node && cf->cf_loc[0]) {
59 return (OF_is_compatible(node, "ti,am3-prcm") ||
60 OF_is_compatible(node, "ti,am3-scm"));
61 }
62
63 return OF_is_compatible(faa->fa_node, "ti,sysc");
64 }
65
66 void
omsysc_attach(struct device * parent,struct device * self,void * aux)67 omsysc_attach(struct device *parent, struct device *self, void *aux)
68 {
69 struct omsysc_softc *sc = (struct omsysc_softc *)self;
70 struct fdt_attach_args *faa = aux;
71
72 if (OF_getproplen(faa->fa_node, "ti,hwmods") < 0 &&
73 OF_is_compatible(faa->fa_node, "ti,sysc-omap2"))
74 clock_enable(faa->fa_node, "fck");
75
76 simplebus_attach(parent, &sc->sc_bus.sc_dev, faa);
77 }
78