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      1 /*	$NetBSD: bcm2838_rng.c,v 1.2 2021/01/27 03:10:19 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2019 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jared D. McNeill
      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: bcm2838_rng.c,v 1.2 2021/01/27 03:10:19 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/device.h>
     37 
     38 #include <dev/ic/rng200var.h>
     39 #include <dev/fdt/fdtvar.h>
     40 
     41 struct bcm2838rng_softc {
     42 	device_t		sc_dev;
     43 	struct rng200_softc	sc_rng200;
     44 };
     45 
     46 static int bcm2838rng_match(device_t, cfdata_t, void *);
     47 static void bcm2838rng_attach(device_t, device_t, void *);
     48 
     49 CFATTACH_DECL_NEW(bcm2838rng_fdt, sizeof(struct bcm2838rng_softc),
     50     bcm2838rng_match, bcm2838rng_attach, NULL, NULL);
     51 
     52 static const struct device_compatible_entry compat_data[] = {
     53 	{ .compat = "brcm,bcm2838-rng200" },
     54 	DEVICE_COMPAT_EOL
     55 };
     56 
     57 /* ARGSUSED */
     58 static int
     59 bcm2838rng_match(device_t parent, cfdata_t match, void *aux)
     60 {
     61 	struct fdt_attach_args * const faa = aux;
     62 
     63 	return of_compatible_match(faa->faa_phandle, compat_data);
     64 }
     65 
     66 static void
     67 bcm2838rng_attach(device_t parent, device_t self, void *aux)
     68 {
     69 	struct bcm2838rng_softc *sc = device_private(self);
     70 	struct fdt_attach_args * const faa = aux;
     71 	bus_addr_t addr;
     72 	bus_size_t size;
     73 	bus_space_handle_t bsh;
     74 	int error;
     75 
     76 	sc->sc_dev = self;
     77 
     78 	error = fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size);
     79 	if (error) {
     80 		aprint_error_dev(sc->sc_dev, ": couldn't get registers\n");
     81 		return;
     82 	}
     83 
     84 	if (bus_space_map(faa->faa_bst, addr, size, 0, &bsh)) {
     85 		aprint_error_dev(sc->sc_dev, ": unable to map device\n");
     86 		return;
     87 	}
     88 
     89 	aprint_naive("\n");
     90 	aprint_normal(": Hardware RNG\n");
     91 
     92 	sc->sc_rng200.sc_bst = faa->faa_bst;
     93 	sc->sc_rng200.sc_bsh = bsh;
     94 	sc->sc_rng200.sc_name = device_xname(sc->sc_dev);
     95 	rng200_attach(&sc->sc_rng200);
     96 }
     97