1 /* $NetBSD: obio_space.c,v 1.6 2003/07/15 00:25:05 lukem Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/bus.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/devmap.h> 49 50 #include <vm/vm.h> 51 #include <vm/pmap.h> 52 #include <vm/vm_kern.h> 53 #include <vm/vm_extern.h> 54 55 #include <machine/bus.h> 56 #include <machine/cpufunc.h> 57 58 void 59 generic_bs_unimplemented(void) 60 { 61 62 panic("unimplemented bus_space function called"); 63 } 64 65 /* Prototypes for all the bus_space structure functions */ 66 bs_protos(generic); 67 68 int 69 generic_bs_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags, 70 bus_space_handle_t *bshp) 71 { 72 void *va; 73 74 /* 75 * We don't even examine the passed-in flags. For ARM, the CACHEABLE 76 * flag doesn't make sense (we create VM_MEMATTR_DEVICE mappings), and 77 * the LINEAR flag is just implied because we use kva_alloc(size). 78 */ 79 if ((va = pmap_mapdev(bpa, size)) == NULL) 80 return (ENOMEM); 81 *bshp = (bus_space_handle_t)va; 82 return (0); 83 } 84 85 int 86 generic_bs_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size, 87 bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap, 88 bus_space_handle_t *bshp) 89 { 90 91 panic("generic_bs_alloc(): not implemented"); 92 } 93 94 void 95 generic_bs_unmap(bus_space_tag_t t, bus_space_handle_t h, bus_size_t size) 96 { 97 98 pmap_unmapdev((vm_offset_t)h, size); 99 } 100 101 void 102 generic_bs_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size) 103 { 104 105 panic("generic_bs_free(): not implemented"); 106 } 107 108 int 109 generic_bs_subregion(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 110 bus_size_t size, bus_space_handle_t *nbshp) 111 { 112 113 *nbshp = bsh + offset; 114 return (0); 115 } 116 117 void 118 generic_bs_barrier(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset, 119 bus_size_t len, int flags) 120 { 121 122 /* 123 * dsb() will drain the L1 write buffer and establish a memory access 124 * barrier point on platforms where that has meaning. On a write we 125 * also need to drain the L2 write buffer, because most on-chip memory 126 * mapped devices are downstream of the L2 cache. Note that this needs 127 * to be done even for memory mapped as Device type, because while 128 * Device memory is not cached, writes to it are still buffered. 129 */ 130 dsb(); 131 if (flags & BUS_SPACE_BARRIER_WRITE) { 132 cpu_l2cache_drain_writebuf(); 133 } 134 } 135