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      1 /*	$NetBSD: obmem.c,v 1.29 2021/08/07 16:19:06 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Adam Glass and Gordon W. Ross.
      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 /*
     33  * On-board MEMory (OBMEM)
     34  * Used by frame buffers...
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: obmem.c,v 1.29 2021/08/07 16:19:06 thorpej Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/systm.h>
     42 #include <sys/device.h>
     43 
     44 #include <uvm/uvm_extern.h>
     45 
     46 #include <machine/autoconf.h>
     47 #include <machine/bus.h>
     48 #include <sun3/sun3/obmem.h>
     49 
     50 static int  obmem_match(device_t, cfdata_t, void *);
     51 static void obmem_attach(device_t, device_t, void *);
     52 
     53 struct obmem_softc {
     54 	device_t	sc_dev;
     55 	bus_space_tag_t	sc_bustag;
     56 	bus_dma_tag_t	sc_dmatag;
     57 };
     58 
     59 CFATTACH_DECL_NEW(obmem, sizeof(struct obmem_softc),
     60     obmem_match, obmem_attach, NULL, NULL);
     61 
     62 static int obmem_attached;
     63 
     64 static int obmem_bus_map(bus_space_tag_t, bus_type_t, bus_addr_t, bus_size_t,
     65     int, vaddr_t, bus_space_handle_t *);
     66 static paddr_t obmem_bus_mmap(bus_space_tag_t, bus_type_t, bus_addr_t, off_t,
     67     int, int);
     68 
     69 static struct sun68k_bus_space_tag obmem_space_tag = {
     70 	NULL,				/* cookie */
     71 	NULL,				/* parent bus space tag */
     72 	obmem_bus_map,			/* bus_space_map */
     73 	NULL,				/* bus_space_unmap */
     74 	NULL,				/* bus_space_subregion */
     75 	NULL,				/* bus_space_barrier */
     76 	obmem_bus_mmap,			/* bus_space_mmap */
     77 	NULL,				/* bus_intr_establish */
     78 	NULL,				/* bus_space_peek_N */
     79 	NULL				/* bus_space_poke_N */
     80 };
     81 
     82 static int
     83 obmem_match(device_t parent, cfdata_t cf, void *aux)
     84 {
     85 	struct confargs *ca = aux;
     86 
     87 	if (obmem_attached)
     88 		return 0;
     89 
     90 	if (ca->ca_bustype != BUS_OBMEM)
     91 		return 0;
     92 
     93 	if (ca->ca_name != NULL && strcmp(cf->cf_name, ca->ca_name) != 0)
     94 		return 0;
     95 
     96 	return 1;
     97 }
     98 
     99 static void
    100 obmem_attach(device_t parent, device_t self, void *aux)
    101 {
    102 	struct confargs *ca = aux;
    103 	struct obmem_softc *sc = device_private(self);
    104 	struct confargs obma;
    105 
    106 	obmem_attached = 1;
    107 	sc->sc_dev = self;
    108 
    109 	aprint_normal("\n");
    110 
    111 	sc->sc_bustag = ca->ca_bustag;
    112 	sc->sc_dmatag = ca->ca_dmatag;
    113 
    114 	obmem_space_tag.cookie = sc;
    115 	obmem_space_tag.parent = sc->sc_bustag;
    116 
    117 	obma = *ca;
    118 	obma.ca_bustag = &obmem_space_tag;
    119 
    120 	/* We know ca_bustype == BUS_OBMEM */
    121 	config_search(self, &obma,
    122 	    CFARGS(.search = bus_scan));
    123 }
    124 
    125 int
    126 obmem_bus_map(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr,
    127     bus_size_t size, int flags, vaddr_t vaddr, bus_space_handle_t *hp)
    128 {
    129 	struct obmem_softc *sc = t->cookie;
    130 
    131 	return bus_space_map2(sc->sc_bustag, PMAP_OBMEM, paddr, size, flags,
    132 	    vaddr, hp);
    133 }
    134 
    135 paddr_t
    136 obmem_bus_mmap(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr, off_t off,
    137     int prot, int flags)
    138 {
    139 	struct obmem_softc *sc = t->cookie;
    140 
    141 	return bus_space_mmap2(sc->sc_bustag, PMAP_OBMEM, paddr, off, prot,
    142 	    flags);
    143 }
    144