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      1 /*	$NetBSD: gfrtc_fdt.c,v 1.3 2024/01/02 07:34:27 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2023 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Nick Hudson
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: gfrtc_fdt.c,v 1.3 2024/01/02 07:34:27 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 
     37 #include <sys/bus.h>
     38 #include <sys/device.h>
     39 
     40 #include <dev/fdt/fdtvar.h>
     41 #include <dev/goldfish/gfrtcvar.h>
     42 
     43 /*
     44  * https://android.googlesource.com/platform/external/qemu/+/master/docs/GOLDFISH-VIRTUAL-HARDWARE.TXT
     45  */
     46 
     47 static const struct device_compatible_entry compat_data[] = {
     48 	{ .compat = "google,goldfish-rtc" },
     49 	DEVICE_COMPAT_EOL
     50 };
     51 
     52 
     53 static int
     54 gfrtc_fdt_match(device_t parent, cfdata_t cf, void *aux)
     55 {
     56 	struct fdt_attach_args * const faa = aux;
     57 
     58 	return of_compatible_match(faa->faa_phandle, compat_data);
     59 }
     60 
     61 static void
     62 gfrtc_fdt_attach(device_t parent, device_t self, void *aux)
     63 {
     64 	struct gfrtc_softc * const sc = device_private(self);
     65 	struct fdt_attach_args * const faa = aux;
     66 	const int phandle = faa->faa_phandle;
     67 	bus_addr_t addr;
     68 	bus_size_t size;
     69 
     70 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     71 		aprint_error(": couldn't get registers\n");
     72 		return;
     73 	}
     74 
     75 	sc->sc_dev = self;
     76 	sc->sc_bst = faa->faa_bst;
     77 	if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
     78 		aprint_error(": couldn't map registers\n");
     79 		return;
     80 	}
     81 
     82 	gfrtc_attach(sc, true);
     83 }
     84 
     85 CFATTACH_DECL_NEW(gfrtc_fdt, sizeof(struct gfrtc_softc),
     86 	gfrtc_fdt_match, gfrtc_fdt_attach, NULL, NULL);
     87