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      1 /* $NetBSD: fdt_bus_machdep.c,v 1.4 2025/09/06 21:02:41 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2021 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: fdt_bus_machdep.c,v 1.4 2025/09/06 21:02:41 thorpej Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/kmem.h>
     35 
     36 #include <dev/fdt/fdtvar.h>
     37 #include <dev/fdt/fdt_platform.h>
     38 
     39 #include <arm/fdt/arm_fdtvar.h>
     40 
     41 extern struct bus_space arm_generic_bs_tag;
     42 
     43 static int
     44 nonposted_mmio_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flag,
     45     bus_space_handle_t *bshp)
     46 {
     47 	if (flag == 0) {
     48 		flag |= BUS_SPACE_MAP_NONPOSTED;
     49 	}
     50 
     51 	return bus_space_map(&arm_generic_bs_tag, bpa, size, flag, bshp);
     52 }
     53 
     54 bus_space_tag_t
     55 fdtbus_bus_tag_create(int phandle, uint32_t flags)
     56 {
     57 	const struct fdt_platform *plat = fdt_platform_find();
     58 	struct bus_space *tagp;
     59 	struct fdt_attach_args faa;
     60 
     61 	plat->fp_init_attach_args(&faa);
     62 
     63 	tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP);
     64 	*tagp = *faa.faa_bst;
     65 	if ((flags & FDT_BUS_SPACE_FLAG_NONPOSTED_MMIO) != 0) {
     66 		tagp->bs_map = nonposted_mmio_bs_map;
     67 	}
     68 
     69 	return tagp;
     70 }
     71