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      1 /* $NetBSD: fdt_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2020 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_dma_machdep.c,v 1.1 2020/02/20 01:35:55 jmcneill 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 
     38 extern struct arm32_bus_dma_tag arm_generic_dma_tag;
     39 
     40 bus_dma_tag_t
     41 fdtbus_dma_tag_create(int phandle, const struct fdt_dma_range *ranges,
     42     u_int nranges)
     43 {
     44 	struct arm32_bus_dma_tag *tagp;
     45 	u_int n;
     46 
     47 	const int flags = of_hasprop(phandle, "dma-coherent") ?
     48 	    _BUS_DMAMAP_COHERENT : 0;
     49 
     50 	tagp = kmem_alloc(sizeof(*tagp), KM_SLEEP);
     51 	*tagp = arm_generic_dma_tag;
     52 	if (nranges == 0) {
     53 		tagp->_nranges = 1;
     54 		tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges), KM_SLEEP);
     55 		tagp->_ranges[0].dr_sysbase = 0;
     56 		tagp->_ranges[0].dr_busbase = 0;
     57 		tagp->_ranges[0].dr_len = UINTPTR_MAX;
     58 		tagp->_ranges[0].dr_flags = flags;
     59 	} else {
     60 		tagp->_nranges = nranges;
     61 		tagp->_ranges = kmem_alloc(sizeof(*tagp->_ranges) * nranges,
     62 		    KM_SLEEP);
     63 		for (n = 0; n < nranges; n++) {
     64 			tagp->_ranges[n].dr_sysbase = ranges[n].dr_sysbase;
     65 			tagp->_ranges[n].dr_busbase = ranges[n].dr_busbase;
     66 			tagp->_ranges[n].dr_len = ranges[n].dr_len;
     67 			tagp->_ranges[n].dr_flags = flags;
     68 		}
     69 	}
     70 
     71 	return tagp;
     72 }
     73