1 /* $NetBSD: vsbus_dma.c,v 1.18 2023/12/20 15:34:46 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: vsbus_dma.c,v 1.18 2023/12/20 15:34:46 thorpej Exp $"); 35 36 #define _VAX_BUS_DMA_PRIVATE 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bus.h> 41 #include <sys/cpu.h> 42 43 #include <uvm/uvm_extern.h> 44 45 #include <machine/sid.h> 46 #include <machine/sgmap.h> 47 #include <machine/vsbus.h> 48 49 static int sgmap_bus_dmamap_create_sgmap(bus_dma_tag_t, bus_size_t, int, 50 bus_size_t, bus_size_t, int, bus_dmamap_t *); 51 52 static void sgmap_bus_dmamap_destroy_sgmap(bus_dma_tag_t, bus_dmamap_t); 53 54 static int sgmap_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 55 bus_size_t, struct proc *, int); 56 57 static int sgmap_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 58 struct mbuf *, int); 59 60 static int sgmap_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 61 struct uio *, int); 62 63 static int sgmap_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 64 bus_dma_segment_t *, int, bus_size_t, int); 65 66 static void sgmap_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 67 68 static void sgmap_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_addr_t, 69 bus_size_t, int); 70 71 void 72 vax_sgmap_dmatag_init(bus_dma_tag_t t, void *cookie, size_t ptecnt) 73 { 74 /* 75 * Initialize the DMA tag used for sgmap-mapped DMA. 76 */ 77 t->_cookie = cookie; 78 t->_wbase = 0; 79 t->_wsize = ptecnt * VAX_NBPG; 80 t->_boundary = 0; 81 t->_dmamap_create = sgmap_bus_dmamap_create_sgmap; 82 t->_dmamap_destroy = sgmap_bus_dmamap_destroy_sgmap; 83 t->_dmamap_load = sgmap_bus_dmamap_load_sgmap; 84 t->_dmamap_load_mbuf = sgmap_bus_dmamap_load_mbuf_sgmap; 85 t->_dmamap_load_uio = sgmap_bus_dmamap_load_uio_sgmap; 86 t->_dmamap_load_raw = sgmap_bus_dmamap_load_raw_sgmap; 87 t->_dmamap_unload = sgmap_bus_dmamap_unload_sgmap; 88 t->_dmamap_sync = sgmap_bus_dmamap_sync; 89 90 t->_dmamem_alloc = _bus_dmamem_alloc; 91 t->_dmamem_free = _bus_dmamem_free; 92 t->_dmamem_map = _bus_dmamem_map; 93 t->_dmamem_unmap = _bus_dmamem_unmap; 94 t->_dmamem_mmap = _bus_dmamem_mmap; 95 } 96 97 void 98 vsbus_dma_init(struct vsbus_softc *sc, unsigned ptecnt) 99 { 100 bus_dma_tag_t t = &sc->sc_dmatag; 101 bus_dma_segment_t segs[1]; 102 struct pte *pte; 103 int nsegs; 104 int error; 105 size_t mapsize = ptecnt * sizeof(struct pte); 106 107 vax_sgmap_dmatag_init(t, sc, ptecnt); 108 109 t->_sgmap = &sc->sc_sgmap; 110 111 if (vax_boardtype == VAX_BTYP_46 || vax_boardtype == VAX_BTYP_48) { 112 /* 113 * Allocate and map the VS4000 scatter gather map. 114 */ 115 error = bus_dmamem_alloc(t, mapsize, mapsize, mapsize, 116 segs, 1, &nsegs, BUS_DMA_NOWAIT); 117 if (error) { 118 panic("vsbus_dma_init: error allocating memory for " 119 "hw sgmap: error=%d", error); 120 } 121 122 error = bus_dmamem_map(t, segs, nsegs, mapsize, 123 (void **)(void *) &pte, BUS_DMA_NOWAIT|BUS_DMA_COHERENT); 124 if (error) { 125 panic("vsbus_dma_init: error mapping memory for " 126 "hw sgmap: error=%d", error); 127 } 128 memset(pte, 0, mapsize); 129 *(volatile int *) (sc->sc_vsregs + 8) = segs->ds_addr; /* set MAP BASE 0x2008008 */ 130 } else { 131 pte = (struct pte *) vax_map_physmem(KA49_SCSIMAP, mapsize / VAX_NBPG); 132 for (nsegs = ptecnt; nsegs > 0; ) { 133 ((uint32_t *) pte)[--nsegs] = 0; 134 } 135 segs->ds_addr = KA49_SCSIMAP; 136 } 137 aprint_normal_dev(sc->sc_dev, 138 "%uK entry DMA SGMAP at PA 0x%lx (VA %p)\n", 139 ptecnt / 1024, segs->ds_addr, pte); 140 141 /* 142 * Initialize the SGMAP. 143 */ 144 vax_sgmap_init(t, &sc->sc_sgmap, "vsbus_sgmap", t->_wbase, t->_wsize, pte, 0); 145 146 } 147 148 /* 149 * Create a VSBUS SGMAP-mapped DMA map. 150 */ 151 int 152 sgmap_bus_dmamap_create_sgmap(bus_dma_tag_t t, bus_size_t size, int nsegments, 153 bus_size_t maxsegsz, bus_size_t boundary, int flags, 154 bus_dmamap_t *dmamp) 155 { 156 bus_dmamap_t map; 157 int error; 158 159 error = _bus_dmamap_create(t, size, nsegments, maxsegsz, 160 boundary, flags, dmamp); 161 if (error) 162 return (error); 163 164 map = *dmamp; 165 166 if (flags & BUS_DMA_ALLOCNOW) { 167 error = vax_sgmap_alloc(map, vax_round_page(size), 168 t->_sgmap, flags); 169 if (error) 170 sgmap_bus_dmamap_destroy_sgmap(t, map); 171 } 172 173 return (error); 174 } 175 176 /* 177 * Destroy a VSBUS SGMAP-mapped DMA map. 178 */ 179 static void 180 sgmap_bus_dmamap_destroy_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 181 { 182 183 if (map->_dm_flags & DMAMAP_HAS_SGMAP) 184 vax_sgmap_free(map, t->_sgmap); 185 186 _bus_dmamap_destroy(t, map); 187 } 188 189 /* 190 * Load a VSBUS SGMAP-mapped DMA map with a linear buffer. 191 */ 192 static int 193 sgmap_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 194 bus_size_t buflen, struct proc *p, int flags) 195 { 196 return vax_sgmap_load(t, map, buf, buflen, p, flags, t->_sgmap); 197 } 198 199 /* 200 * Load a VSBUS SGMAP-mapped DMA map with an mbuf chain. 201 */ 202 static int 203 sgmap_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 204 struct mbuf *m, int flags) 205 { 206 return vax_sgmap_load_mbuf(t, map, m, flags, t->_sgmap); 207 } 208 209 /* 210 * Load a VSBUS SGMAP-mapped DMA map with a uio. 211 */ 212 static int 213 sgmap_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 214 struct uio *uio, int flags) 215 { 216 return vax_sgmap_load_uio(t, map, uio, flags, t->_sgmap); 217 } 218 219 /* 220 * Load a VSBUS SGMAP-mapped DMA map with raw memory. 221 */ 222 static int 223 sgmap_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 224 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 225 { 226 return vax_sgmap_load_raw(t, map, segs, nsegs, size, flags, t->_sgmap); 227 } 228 229 /* 230 * Unload a VSBUS DMA map. 231 */ 232 static void 233 sgmap_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 234 { 235 /* 236 * Invalidate any SGMAP page table entries used by this 237 * mapping. 238 */ 239 vax_sgmap_unload(t, map, t->_sgmap); 240 241 /* 242 * Do the generic bits of the unload. 243 */ 244 _bus_dmamap_unload(t, map); 245 } 246 247 /* 248 * Sync the bus map. 249 */ 250 static void 251 sgmap_bus_dmamap_sync(bus_dma_tag_t tag, bus_dmamap_t dmam, bus_addr_t offset, 252 bus_size_t len, int ops) 253 { 254 /* not needed */ 255 } 256
Indexes created Sun Sep 21 20:09:37 GMT 2025