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