apecs_dma.c revision 1.15
1 /* $NetBSD: apecs_dma.c,v 1.15 2001/07/19 18:39:29 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND 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 THE FOUNDATION OR CONTRIBUTORS 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> /* RCS ID & Copyright macro defns */ 41 42 __KERNEL_RCSID(0, "$NetBSD: apecs_dma.c,v 1.15 2001/07/19 18:39:29 thorpej Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/device.h> 48 #include <sys/malloc.h> 49 50 #include <uvm/uvm_extern.h> 51 52 #define _ALPHA_BUS_DMA_PRIVATE 53 #include <machine/bus.h> 54 55 #include <dev/pci/pcireg.h> 56 #include <dev/pci/pcivar.h> 57 #include <alpha/pci/apecsreg.h> 58 #include <alpha/pci/apecsvar.h> 59 60 bus_dma_tag_t apecs_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 61 62 int apecs_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 63 bus_size_t, struct proc *, int)); 64 65 int apecs_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 66 struct mbuf *, int)); 67 68 int apecs_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 69 struct uio *, int)); 70 71 int apecs_bus_dmamap_load_raw_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 72 bus_dma_segment_t *, int, bus_size_t, int)); 73 74 void apecs_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 75 76 /* 77 * Direct-mapped window: 1G at 1G 78 */ 79 #define APECS_DIRECT_MAPPED_BASE (1*1024*1024*1024) 80 #define APECS_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 81 82 /* 83 * SGMAP window: 8M at 8M 84 */ 85 #define APECS_SGMAP_MAPPED_BASE (8*1024*1024) 86 #define APECS_SGMAP_MAPPED_SIZE (8*1024*1024) 87 88 /* APECS has a 256-byte out-bound DMA prefetch threshold. */ 89 #define APECS_SGMAP_PFTHRESH 256 90 91 /* 92 * Macro to flush APECS scatter/gather TLB. 93 */ 94 #define APECS_TLB_INVALIDATE() \ 95 do { \ 96 alpha_mb(); \ 97 REGVAL(EPIC_TBIA) = 0; \ 98 alpha_mb(); \ 99 } while (0) 100 101 void 102 apecs_dma_init(acp) 103 struct apecs_config *acp; 104 { 105 bus_addr_t tbase; 106 bus_dma_tag_t t; 107 108 /* 109 * Initialize the DMA tag used for direct-mapped DMA. 110 */ 111 t = &acp->ac_dmat_direct; 112 t->_cookie = acp; 113 t->_wbase = APECS_DIRECT_MAPPED_BASE; 114 t->_wsize = APECS_DIRECT_MAPPED_SIZE; 115 t->_next_window = NULL; 116 t->_boundary = 0; 117 t->_sgmap = NULL; 118 t->_get_tag = apecs_dma_get_tag; 119 t->_dmamap_create = _bus_dmamap_create; 120 t->_dmamap_destroy = _bus_dmamap_destroy; 121 t->_dmamap_load = _bus_dmamap_load_direct; 122 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 123 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 124 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 125 t->_dmamap_unload = _bus_dmamap_unload; 126 t->_dmamap_sync = _bus_dmamap_sync; 127 128 t->_dmamem_alloc = _bus_dmamem_alloc; 129 t->_dmamem_free = _bus_dmamem_free; 130 t->_dmamem_map = _bus_dmamem_map; 131 t->_dmamem_unmap = _bus_dmamem_unmap; 132 t->_dmamem_mmap = _bus_dmamem_mmap; 133 134 /* 135 * Initialize the DMA tag used for sgmap-mapped DMA. 136 */ 137 t = &acp->ac_dmat_sgmap; 138 t->_cookie = acp; 139 t->_wbase = APECS_SGMAP_MAPPED_BASE; 140 t->_wsize = APECS_SGMAP_MAPPED_SIZE; 141 t->_next_window = NULL; 142 t->_boundary = 0; 143 t->_sgmap = &acp->ac_sgmap; 144 t->_pfthresh = APECS_SGMAP_PFTHRESH; 145 t->_get_tag = apecs_dma_get_tag; 146 t->_dmamap_create = alpha_sgmap_dmamap_create; 147 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 148 t->_dmamap_load = apecs_bus_dmamap_load_sgmap; 149 t->_dmamap_load_mbuf = apecs_bus_dmamap_load_mbuf_sgmap; 150 t->_dmamap_load_uio = apecs_bus_dmamap_load_uio_sgmap; 151 t->_dmamap_load_raw = apecs_bus_dmamap_load_raw_sgmap; 152 t->_dmamap_unload = apecs_bus_dmamap_unload_sgmap; 153 t->_dmamap_sync = _bus_dmamap_sync; 154 155 t->_dmamem_alloc = _bus_dmamem_alloc; 156 t->_dmamem_free = _bus_dmamem_free; 157 t->_dmamem_map = _bus_dmamem_map; 158 t->_dmamem_unmap = _bus_dmamem_unmap; 159 t->_dmamem_mmap = _bus_dmamem_mmap; 160 161 /* 162 * The firmware has set up window 2 as a 1G direct-mapped DMA 163 * window beginning at 1G. We leave it alone. Disable 164 * window 1. 165 */ 166 REGVAL(EPIC_PCI_BASE_1) = 0; 167 alpha_mb(); 168 169 /* 170 * Initialize the SGMAP. 171 */ 172 alpha_sgmap_init(t, &acp->ac_sgmap, "apecs_sgmap", 173 APECS_SGMAP_MAPPED_BASE, 0, APECS_SGMAP_MAPPED_SIZE, 174 sizeof(u_int64_t), NULL, 0); 175 176 /* 177 * Set up window 1 as an 8MB SGMAP-mapped window 178 * starting at 8MB. 179 */ 180 REGVAL(EPIC_PCI_BASE_1) = APECS_SGMAP_MAPPED_BASE | 181 EPIC_PCI_BASE_SGEN | EPIC_PCI_BASE_WENB; 182 alpha_mb(); 183 184 REGVAL(EPIC_PCI_MASK_1) = EPIC_PCI_MASK_8M; 185 alpha_mb(); 186 187 tbase = acp->ac_sgmap.aps_ptpa >> EPIC_TBASE_SHIFT; 188 if ((tbase & EPIC_TBASE_T_BASE) != tbase) 189 panic("apecs_dma_init: bad page table address"); 190 REGVAL(EPIC_TBASE_1) = tbase; 191 alpha_mb(); 192 193 APECS_TLB_INVALIDATE(); 194 195 /* XXX XXX BEGIN XXX XXX */ 196 { /* XXX */ 197 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 198 alpha_XXX_dmamap_or = APECS_DIRECT_MAPPED_BASE; /* XXX */ 199 } /* XXX */ 200 /* XXX XXX END XXX XXX */ 201 } 202 203 /* 204 * Return the bus dma tag to be used for the specified bus type. 205 * INTERNAL USE ONLY! 206 */ 207 bus_dma_tag_t 208 apecs_dma_get_tag(t, bustype) 209 bus_dma_tag_t t; 210 alpha_bus_t bustype; 211 { 212 struct apecs_config *acp = t->_cookie; 213 214 switch (bustype) { 215 case ALPHA_BUS_PCI: 216 case ALPHA_BUS_EISA: 217 /* 218 * Systems with an APECS can only support 1G 219 * of memory, so we use the direct-mapped window 220 * on busses that have 32-bit DMA. 221 */ 222 return (&acp->ac_dmat_direct); 223 224 case ALPHA_BUS_ISA: 225 /* 226 * ISA doesn't have enough address bits to use 227 * the direct-mapped DMA window, so we must use 228 * SGMAPs. 229 */ 230 return (&acp->ac_dmat_sgmap); 231 232 default: 233 panic("apecs_dma_get_tag: shouldn't be here, really..."); 234 } 235 } 236 237 /* 238 * Load an APECS SGMAP-mapped DMA map with a linear buffer. 239 */ 240 int 241 apecs_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 242 bus_dma_tag_t t; 243 bus_dmamap_t map; 244 void *buf; 245 bus_size_t buflen; 246 struct proc *p; 247 int flags; 248 { 249 int error; 250 251 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 252 t->_sgmap); 253 if (error == 0) 254 APECS_TLB_INVALIDATE(); 255 256 return (error); 257 } 258 259 /* 260 * Load an APECS SGMAP-mapped DMA map with an mbuf chain. 261 */ 262 int 263 apecs_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 264 bus_dma_tag_t t; 265 bus_dmamap_t map; 266 struct mbuf *m; 267 int flags; 268 { 269 int error; 270 271 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 272 if (error == 0) 273 APECS_TLB_INVALIDATE(); 274 275 return (error); 276 } 277 278 /* 279 * Load an APECS SGMAP-mapped DMA map with a uio. 280 */ 281 int 282 apecs_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 283 bus_dma_tag_t t; 284 bus_dmamap_t map; 285 struct uio *uio; 286 int flags; 287 { 288 int error; 289 290 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 291 if (error == 0) 292 APECS_TLB_INVALIDATE(); 293 294 return (error); 295 } 296 297 /* 298 * Load an APECS SGMAP-mapped DMA map with raw memory. 299 */ 300 int 301 apecs_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 302 bus_dma_tag_t t; 303 bus_dmamap_t map; 304 bus_dma_segment_t *segs; 305 int nsegs; 306 bus_size_t size; 307 int flags; 308 { 309 int error; 310 311 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 312 t->_sgmap); 313 if (error == 0) 314 APECS_TLB_INVALIDATE(); 315 316 return (error); 317 } 318 319 /* 320 * Unload an APECS DMA map. 321 */ 322 void 323 apecs_bus_dmamap_unload_sgmap(t, map) 324 bus_dma_tag_t t; 325 bus_dmamap_t map; 326 { 327 328 /* 329 * Invalidate any SGMAP page table entries used by this 330 * mapping. 331 */ 332 pci_sgmap_pte64_unload(t, map, t->_sgmap); 333 APECS_TLB_INVALIDATE(); 334 335 /* 336 * Do the generic bits of the unload. 337 */ 338 _bus_dmamap_unload(t, map); 339 } 340
Indexes created Tue Sep 30 07:10:03 GMT 2025