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      1 /* $NetBSD: vchiq_kmod_netbsd.c,v 1.14 2024/11/07 09:51:00 rin 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_kmod_netbsd.c,v 1.14 2024/11/07 09:51:00 rin 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 "vchiq_arm.h"
     46 #include "vchiq_2835.h"
     47 #include "vchiq_netbsd.h"
     48 
     49 extern VCHIQ_STATE_T g_state;
     50 
     51 static struct vchiq_softc *vchiq_softc = NULL;
     52 
     53 #define VCHIQ_DOORBELL0		0x0
     54 #define VCHIQ_DOORBELL1		0x4
     55 #define VCHIQ_DOORBELL2		0x8
     56 #define VCHIQ_DOORBELL3		0xC
     57 
     58 void
     59 vchiq_set_softc(struct vchiq_softc *sc)
     60 {
     61 	vchiq_softc = sc;
     62 }
     63 
     64 int
     65 vchiq_intr(void *priv)
     66 {
     67 	struct vchiq_softc *sc = priv;
     68 	uint32_t status;
     69 
     70 	bus_space_barrier(sc->sc_iot, sc->sc_ioh,
     71 	    VCHIQ_DOORBELL0, 4, BUS_SPACE_BARRIER_READ);
     72 
     73 	rmb();
     74 	status = bus_space_read_4(sc->sc_iot, sc->sc_ioh, VCHIQ_DOORBELL0);
     75 	if (status & 0x4) {
     76 		remote_event_pollall(&g_state);
     77 		return 1;
     78 	}
     79 
     80 	return 0;
     81 }
     82 
     83 int
     84 vchiq_print(void *aux, const char *pnp)
     85 {
     86 	struct vchiq_attach_args *vaa = aux;
     87 
     88 	if (pnp)
     89 		aprint_normal("%s at %s", vaa->vaa_name, pnp);
     90 
     91 	return UNCONF;
     92 }
     93 
     94 void
     95 remote_event_signal(REMOTE_EVENT_T *event)
     96 {
     97 	wmb();
     98 
     99 	event->fired = 1;
    100 
    101 	dsb(sy);		/* data barrier operation */
    102 
    103 	if (event->armed) {
    104 		bus_space_write_4(vchiq_softc->sc_iot, vchiq_softc->sc_ioh,
    105 		    VCHIQ_DOORBELL2, 0);
    106 		bus_space_barrier(vchiq_softc->sc_iot, vchiq_softc->sc_ioh,
    107 		    VCHIQ_DOORBELL2, 4, BUS_SPACE_BARRIER_WRITE);
    108 	}
    109 }
    110 
    111 SYSCTL_SETUP(sysctl_hw_vchiq_setup, "sysctl hw.vchiq setup")
    112 {
    113 	const struct sysctlnode *rnode = NULL;
    114 	const struct sysctlnode *cnode = NULL;
    115 
    116 	sysctl_createv(clog, 0, NULL, &rnode,
    117 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "vchiq",
    118 	    NULL, NULL, 0,
    119 	    NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL);
    120 
    121 	sysctl_createv(clog, 0, &rnode, &cnode,
    122 	    CTLFLAG_PERMANENT, CTLTYPE_NODE, "loglevel",
    123 	    NULL, NULL, 0,
    124 	    NULL, 0, CTL_CREATE, CTL_EOL);
    125 
    126 	sysctl_createv(clog, 0, &cnode, NULL,
    127 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "core",
    128 	    SYSCTL_DESCR("VChiq Core Loglevel"), NULL, 0,
    129 	    &vchiq_core_log_level, 0, CTL_CREATE, CTL_EOL);
    130 
    131 	sysctl_createv(clog, 0, &cnode, NULL,
    132 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "coremsg",
    133 	    SYSCTL_DESCR("VChiq Core Message Loglevel"), NULL, 0,
    134 	    &vchiq_core_msg_log_level, 0, CTL_CREATE, CTL_EOL);
    135 
    136 	sysctl_createv(clog, 0, &cnode, NULL,
    137 	    CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "sync",
    138 	    SYSCTL_DESCR("VChiq Sync Loglevel"), NULL, 0,
    139 	    &vchiq_sync_log_level, 0, CTL_CREATE, CTL_EOL);
    140 }
    141