apecs_dma.c revision 1.24
1 /* $NetBSD: apecs_dma.c,v 1.24 2021/05/05 02:15:18 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> /* RCS ID & Copyright macro defns */ 34 35 __KERNEL_RCSID(0, "$NetBSD: apecs_dma.c,v 1.24 2021/05/05 02:15:18 thorpej Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/device.h> 41 #include <sys/malloc.h> 42 43 #define _ALPHA_BUS_DMA_PRIVATE 44 #include <sys/bus.h> 45 46 #include <dev/pci/pcireg.h> 47 #include <dev/pci/pcivar.h> 48 #include <alpha/pci/apecsreg.h> 49 #include <alpha/pci/apecsvar.h> 50 51 static bus_dma_tag_t apecs_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 52 53 static int apecs_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 54 bus_size_t, struct proc *, int); 55 56 static int apecs_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 57 struct mbuf *, int); 58 59 static int apecs_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 60 struct uio *, int); 61 62 static int apecs_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 63 bus_dma_segment_t *, int, bus_size_t, int); 64 65 static void apecs_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 66 67 /* 68 * Direct-mapped window: 1G at 1G 69 */ 70 #define APECS_DIRECT_MAPPED_BASE (1*1024*1024*1024) 71 #define APECS_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 72 73 /* 74 * SGMAP window: 8M at 8M 75 */ 76 #define APECS_SGMAP_MAPPED_BASE (8*1024*1024) 77 #define APECS_SGMAP_MAPPED_SIZE (8*1024*1024) 78 79 /* APECS has a 256-byte out-bound DMA prefetch threshold. */ 80 #define APECS_SGMAP_PFTHRESH 256 81 82 /* 83 * Macro to flush APECS scatter/gather TLB. 84 */ 85 #define APECS_TLB_INVALIDATE() \ 86 do { \ 87 alpha_mb(); \ 88 REGVAL(EPIC_TBIA) = 0; \ 89 alpha_mb(); \ 90 } while (0) 91 92 void 93 apecs_dma_init(struct apecs_config *acp) 94 { 95 bus_addr_t tbase; 96 bus_dma_tag_t t; 97 98 /* 99 * Initialize the DMA tag used for direct-mapped DMA. 100 */ 101 t = &acp->ac_dmat_direct; 102 t->_cookie = acp; 103 t->_wbase = APECS_DIRECT_MAPPED_BASE; 104 t->_wsize = APECS_DIRECT_MAPPED_SIZE; 105 t->_next_window = NULL; 106 t->_boundary = 0; 107 t->_sgmap = NULL; 108 t->_get_tag = apecs_dma_get_tag; 109 t->_dmamap_create = _bus_dmamap_create; 110 t->_dmamap_destroy = _bus_dmamap_destroy; 111 t->_dmamap_load = _bus_dmamap_load_direct; 112 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 113 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 114 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 115 t->_dmamap_unload = _bus_dmamap_unload; 116 t->_dmamap_sync = _bus_dmamap_sync; 117 118 t->_dmamem_alloc = _bus_dmamem_alloc; 119 t->_dmamem_free = _bus_dmamem_free; 120 t->_dmamem_map = _bus_dmamem_map; 121 t->_dmamem_unmap = _bus_dmamem_unmap; 122 t->_dmamem_mmap = _bus_dmamem_mmap; 123 124 /* 125 * Initialize the DMA tag used for sgmap-mapped DMA. 126 */ 127 t = &acp->ac_dmat_sgmap; 128 t->_cookie = acp; 129 t->_wbase = APECS_SGMAP_MAPPED_BASE; 130 t->_wsize = APECS_SGMAP_MAPPED_SIZE; 131 t->_next_window = NULL; 132 t->_boundary = 0; 133 t->_sgmap = &acp->ac_sgmap; 134 t->_pfthresh = APECS_SGMAP_PFTHRESH; 135 t->_get_tag = apecs_dma_get_tag; 136 t->_dmamap_create = alpha_sgmap_dmamap_create; 137 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 138 t->_dmamap_load = apecs_bus_dmamap_load_sgmap; 139 t->_dmamap_load_mbuf = apecs_bus_dmamap_load_mbuf_sgmap; 140 t->_dmamap_load_uio = apecs_bus_dmamap_load_uio_sgmap; 141 t->_dmamap_load_raw = apecs_bus_dmamap_load_raw_sgmap; 142 t->_dmamap_unload = apecs_bus_dmamap_unload_sgmap; 143 t->_dmamap_sync = _bus_dmamap_sync; 144 145 t->_dmamem_alloc = _bus_dmamem_alloc; 146 t->_dmamem_free = _bus_dmamem_free; 147 t->_dmamem_map = _bus_dmamem_map; 148 t->_dmamem_unmap = _bus_dmamem_unmap; 149 t->_dmamem_mmap = _bus_dmamem_mmap; 150 151 /* 152 * The firmware has set up window 2 as a 1G direct-mapped DMA 153 * window beginning at 1G. We leave it alone. Disable 154 * window 1. 155 */ 156 REGVAL(EPIC_PCI_BASE_1) = 0; 157 alpha_mb(); 158 159 /* 160 * Initialize the SGMAP. 161 */ 162 alpha_sgmap_init(t, &acp->ac_sgmap, "apecs_sgmap", 163 APECS_SGMAP_MAPPED_BASE, 0, APECS_SGMAP_MAPPED_SIZE, 164 sizeof(uint64_t), NULL, 0); 165 166 /* 167 * Set up window 1 as an 8MB SGMAP-mapped window 168 * starting at 8MB. 169 */ 170 REGVAL(EPIC_PCI_BASE_1) = APECS_SGMAP_MAPPED_BASE | 171 EPIC_PCI_BASE_SGEN | EPIC_PCI_BASE_WENB; 172 alpha_mb(); 173 174 REGVAL(EPIC_PCI_MASK_1) = EPIC_PCI_MASK_8M; 175 alpha_mb(); 176 177 tbase = acp->ac_sgmap.aps_ptpa >> EPIC_TBASE_SHIFT; 178 if ((tbase & EPIC_TBASE_T_BASE) != tbase) 179 panic("apecs_dma_init: bad page table address"); 180 REGVAL(EPIC_TBASE_1) = tbase; 181 alpha_mb(); 182 183 APECS_TLB_INVALIDATE(); 184 } 185 186 /* 187 * Return the bus dma tag to be used for the specified bus type. 188 * INTERNAL USE ONLY! 189 */ 190 static bus_dma_tag_t 191 apecs_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 192 { 193 struct apecs_config *acp = t->_cookie; 194 195 switch (bustype) { 196 case ALPHA_BUS_PCI: 197 case ALPHA_BUS_EISA: 198 /* 199 * Systems with an APECS can only support 1G 200 * of memory, so we use the direct-mapped window 201 * on busses that have 32-bit DMA. 202 */ 203 return (&acp->ac_dmat_direct); 204 205 case ALPHA_BUS_ISA: 206 /* 207 * ISA doesn't have enough address bits to use 208 * the direct-mapped DMA window, so we must use 209 * SGMAPs. 210 */ 211 return (&acp->ac_dmat_sgmap); 212 213 default: 214 panic("apecs_dma_get_tag: shouldn't be here, really..."); 215 } 216 } 217 218 /* 219 * Load an APECS SGMAP-mapped DMA map with a linear buffer. 220 */ 221 static int 222 apecs_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) 223 { 224 int error; 225 226 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 227 t->_sgmap); 228 if (error == 0) 229 APECS_TLB_INVALIDATE(); 230 231 return (error); 232 } 233 234 /* 235 * Load an APECS SGMAP-mapped DMA map with an mbuf chain. 236 */ 237 static int 238 apecs_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 239 { 240 int error; 241 242 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 243 if (error == 0) 244 APECS_TLB_INVALIDATE(); 245 246 return (error); 247 } 248 249 /* 250 * Load an APECS SGMAP-mapped DMA map with a uio. 251 */ 252 static int 253 apecs_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 254 { 255 int error; 256 257 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 258 if (error == 0) 259 APECS_TLB_INVALIDATE(); 260 261 return (error); 262 } 263 264 /* 265 * Load an APECS SGMAP-mapped DMA map with raw memory. 266 */ 267 static int 268 apecs_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 269 { 270 int error; 271 272 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 273 t->_sgmap); 274 if (error == 0) 275 APECS_TLB_INVALIDATE(); 276 277 return (error); 278 } 279 280 /* 281 * Unload an APECS DMA map. 282 */ 283 static void 284 apecs_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 285 { 286 287 /* 288 * Invalidate any SGMAP page table entries used by this 289 * mapping. 290 */ 291 pci_sgmap_pte64_unload(t, map, t->_sgmap); 292 APECS_TLB_INVALIDATE(); 293 294 /* 295 * Do the generic bits of the unload. 296 */ 297 _bus_dmamap_unload_common(t, map); 298 } 299
Indexes created Mon Sep 29 21:09:56 GMT 2025