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      1 /*	$NetBSD: bcm2835_mbox_fdt.c,v 1.3 2021/01/29 14:11:14 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 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: bcm2835_mbox_fdt.c,v 1.3 2021/01/29 14:11:14 skrll Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/device.h>
     38 #include <sys/kernel.h>
     39 #include <sys/timetc.h>
     40 #include <sys/bus.h>
     41 #include <sys/mutex.h>
     42 
     43 #include <arm/broadcom/bcm2835_mbox.h>
     44 #include <arm/broadcom/bcm2835_mboxreg.h>
     45 #include <arm/broadcom/bcm2835reg.h>
     46 #include <arm/broadcom/bcm2835var.h>
     47 
     48 #include <dev/fdt/fdtvar.h>
     49 
     50 static int bcmmbox_fdt_match(device_t, cfdata_t, void *);
     51 static void bcmmbox_fdt_attach(device_t, device_t, void *);
     52 
     53 CFATTACH_DECL_NEW(bcmmbox_fdt, sizeof(struct bcm2835mbox_softc),
     54     bcmmbox_fdt_match, bcmmbox_fdt_attach, NULL, NULL);
     55 
     56 static const struct device_compatible_entry compat_data[] = {
     57 	{ .compat = "brcm,bcm2835-mbox" },
     58 	DEVICE_COMPAT_EOL
     59 };
     60 
     61 /* ARGSUSED */
     62 static int
     63 bcmmbox_fdt_match(device_t parent, cfdata_t match, void *aux)
     64 {
     65 	struct fdt_attach_args * const faa = aux;
     66 
     67 	return of_compatible_match(faa->faa_phandle, compat_data);
     68 }
     69 
     70 static void
     71 bcmmbox_fdt_attach(device_t parent, device_t self, void *aux)
     72 {
     73 	struct bcm2835mbox_softc *sc = device_private(self);
     74 	struct fdt_attach_args * const faa = aux;
     75 	const int phandle = faa->faa_phandle;
     76 	char intrstr[128];
     77 	bus_addr_t addr;
     78 	bus_size_t size;
     79 
     80 	sc->sc_dev = self;
     81 	sc->sc_iot = faa->faa_bst;
     82 	sc->sc_dmat = faa->faa_dmat;
     83 
     84 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     85 		aprint_error(": couldn't get register address\n");
     86 		return;
     87 	}
     88 
     89 	if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_ioh) != 0) {
     90 		aprint_error_dev(sc->sc_dev, "unable to map device\n");
     91 		return;
     92 	}
     93 
     94 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
     95 		aprint_error(": failed to decode interrupt\n");
     96 		return;
     97 	}
     98 
     99 	aprint_naive("\n");
    100 	aprint_normal(": VC mailbox\n");
    101 
    102 	sc->sc_intrh = fdtbus_intr_establish_xname(phandle, 0, IPL_VM, 0,
    103 	    bcmmbox_intr, sc, device_xname(self));
    104 	if (sc->sc_intrh == NULL) {
    105 		aprint_error_dev(self, "failed to establish interrupt %s\n",
    106 		    intrstr);
    107 		return;
    108 	}
    109 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    110 
    111 	bcmmbox_attach(sc);
    112 }
    113