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      1 /* $NetBSD: vchiq_netbsd_fdt.c,v 1.7 2021/08/07 16:19:18 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2013 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: vchiq_netbsd_fdt.c,v 1.7 2021/08/07 16:19:18 thorpej 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/bus.h>
     40 #include <sys/sysctl.h>
     41 
     42 #include <arm/broadcom/bcm2835reg.h>
     43 #include <arm/broadcom/bcm2835_intr.h>
     44 
     45 #include <dev/fdt/fdtvar.h>
     46 
     47 #include "vchiq_arm.h"
     48 #include "vchiq_2835.h"
     49 #include "vchiq_netbsd.h"
     50 
     51 struct vchiq_fdt_softc {
     52 	struct vchiq_softc sc_vchiq;
     53 	int sc_phandle;
     54 };
     55 
     56 static int vchiq_fdt_match(device_t, cfdata_t, void *);
     57 static void vchiq_fdt_attach(device_t, device_t, void *);
     58 
     59 static void vchiq_fdt_defer(device_t);
     60 
     61 /* External functions */
     62 int vchiq_init(void);
     63 
     64 
     65 CFATTACH_DECL_NEW(vchiq_fdt, sizeof(struct vchiq_fdt_softc),
     66     vchiq_fdt_match, vchiq_fdt_attach, NULL, NULL);
     67 
     68 static const struct device_compatible_entry compat_data[] = {
     69 	{ .compat = "brcm,bcm2835-vchiq" },
     70 	DEVICE_COMPAT_EOL
     71 };
     72 
     73 static int
     74 vchiq_fdt_match(device_t parent, cfdata_t match, void *aux)
     75 {
     76 	struct fdt_attach_args * const faa = aux;
     77 
     78 	return of_compatible_match(faa->faa_phandle, compat_data);
     79 }
     80 
     81 static void
     82 vchiq_fdt_attach(device_t parent, device_t self, void *aux)
     83 {
     84 	struct vchiq_fdt_softc *fsc = device_private(self);
     85 	struct vchiq_softc *sc = &fsc->sc_vchiq;
     86 	struct fdt_attach_args * const faa = aux;
     87 	const int phandle = faa->faa_phandle;
     88 
     89 	aprint_naive("\n");
     90 	aprint_normal(": BCM2835 VCHIQ\n");
     91 
     92 	sc->sc_dev = self;
     93 	sc->sc_iot = faa->faa_bst;
     94 	fsc->sc_phandle = phandle;
     95 
     96 #if BYTE_ORDER == BIG_ENDIAN
     97 	aprint_error_dev(sc->sc_dev, "not supported yet in big-endian mode\n");
     98 	return;
     99 #endif
    100 
    101 	bus_addr_t addr;
    102 	bus_size_t size;
    103 
    104 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
    105 		aprint_error_dev(sc->sc_dev, "couldn't get register address\n");
    106 		return;
    107 	}
    108 
    109 	if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_ioh) != 0) {
    110 		aprint_error_dev(sc->sc_dev, "unable to map device\n");
    111 		return;
    112 	}
    113 
    114 	vchiq_platform_attach(faa->faa_dmat);
    115 
    116 	vchiq_set_softc(sc);
    117 
    118 	config_mountroot(self, vchiq_fdt_defer);
    119 }
    120 
    121 static void
    122 vchiq_fdt_defer(device_t self)
    123 {
    124 	struct vchiq_attach_args vaa;
    125 	struct vchiq_fdt_softc *fsc = device_private(self);
    126 	struct vchiq_softc *sc = &fsc->sc_vchiq;
    127 	const int phandle = fsc->sc_phandle;
    128 
    129 	vchiq_core_initialize();
    130 
    131 	char intrstr[128];
    132 	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
    133 		aprint_error(": failed to decode interrupt\n");
    134 		return;
    135 	}
    136 
    137 	sc->sc_ih = fdtbus_intr_establish_xname(phandle, 0, IPL_VM,
    138 	    FDT_INTR_MPSAFE, vchiq_intr, sc, device_xname(self));
    139 	if (sc->sc_ih == NULL) {
    140 		aprint_error_dev(self, "failed to establish interrupt %s\n",
    141 		    intrstr);
    142 		return;
    143 	}
    144 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    145 
    146 	vchiq_init();
    147 
    148 	vaa.vaa_name = "AUDS";
    149 	config_found(self, &vaa, vchiq_print, CFARGS_NONE);
    150 }
    151