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pvbus.c revision 1.2 
      1 /*	$NetBSD: pvbus.c,v 1.2 2025/01/14 08:03:40 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2024 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Emile 'iMil' Heitor.
      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/param.h>
     33 
     34 #include <sys/bus.h>
     35 #include <sys/cdefs.h>
     36 #include <sys/device.h>
     37 #include <sys/kernel.h>
     38 #include <sys/systm.h>
     39 
     40 #include <machine/bus_private.h>
     41 
     42 #include <arch/x86/pv/pvvar.h>
     43 
     44 static int _pv_dma_may_bounce(bus_dma_tag_t, bus_dmamap_t, int, int *);
     45 static int pv_match(device_t, cfdata_t, void *);
     46 static void pv_attach(device_t, device_t, void *);
     47 static int pv_submatch(device_t, cfdata_t, const int *, void *);
     48 
     49 struct x86_bus_dma_tag pvbus_bus_dma_tag = {
     50 	._tag_needs_free	= 0,
     51 	._bounce_thresh		= 0,
     52 	._bounce_alloc_lo	= 0,
     53 	._bounce_alloc_hi	= 0,
     54 	._may_bounce		= _pv_dma_may_bounce,
     55 };
     56 
     57 CFATTACH_DECL_NEW(pv, sizeof(struct pv_softc),
     58     pv_match, pv_attach, NULL, NULL);
     59 
     60 static int
     61 _pv_dma_may_bounce(bus_dma_tag_t t, bus_dmamap_t map, int flags,
     62     int *cookieflagsp)
     63 {
     64 
     65 	if ((map->_dm_size / PAGE_SIZE) > map->_dm_segcnt)
     66 		*cookieflagsp |= X86_DMA_MIGHT_NEED_BOUNCE;
     67 
     68 	return 0;
     69 }
     70 
     71 static int
     72 pv_match(device_t parent, cfdata_t match, void *aux)
     73 {
     74 
     75 	return 1;
     76 }
     77 
     78 static void
     79 pv_attach(device_t parent, device_t self, void *aux)
     80 {
     81 	struct pv_attach_args pvaa;
     82 
     83 	pvaa.pvaa_memt = x86_bus_space_mem;
     84 	pvaa.pvaa_dmat = &pvbus_bus_dma_tag;
     85 
     86 	aprint_naive("\n");
     87 	aprint_normal("\n");
     88 
     89 	config_found(self, &pvaa, NULL, CFARGS(.search = pv_submatch));
     90 }
     91 
     92 static int
     93 pv_submatch(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
     94 {
     95 	struct pv_attach_args *pvaa = aux;
     96 
     97 	if (config_probe(parent, cf, pvaa)) {
     98 		config_attach(parent, cf, pvaa, NULL, CFARGS_NONE);
     99 		return 0;
    100 	}
    101 	return 0;
    102 }
    103