apecs_dma.c revision 1.14
1 /* $NetBSD: apecs_dma.c,v 1.14 2001/01/03 19:16:00 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 1.14 2001/01/03 19:16:00 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 /* 89 * Macro to flush APECS scatter/gather TLB. 90 */ 91 #define APECS_TLB_INVALIDATE() \ 92 do { \ 93 alpha_mb(); \ 94 REGVAL(EPIC_TBIA) = 0; \ 95 alpha_mb(); \ 96 } while (0) 97 98 void 99 apecs_dma_init(acp) 100 struct apecs_config *acp; 101 { 102 bus_addr_t tbase; 103 bus_dma_tag_t t; 104 105 /* 106 * Initialize the DMA tag used for direct-mapped DMA. 107 */ 108 t = &acp->ac_dmat_direct; 109 t->_cookie = acp; 110 t->_wbase = APECS_DIRECT_MAPPED_BASE; 111 t->_wsize = APECS_DIRECT_MAPPED_SIZE; 112 t->_next_window = NULL; 113 t->_boundary = 0; 114 t->_sgmap = NULL; 115 t->_get_tag = apecs_dma_get_tag; 116 t->_dmamap_create = _bus_dmamap_create; 117 t->_dmamap_destroy = _bus_dmamap_destroy; 118 t->_dmamap_load = _bus_dmamap_load_direct; 119 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 120 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 121 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 122 t->_dmamap_unload = _bus_dmamap_unload; 123 t->_dmamap_sync = _bus_dmamap_sync; 124 125 t->_dmamem_alloc = _bus_dmamem_alloc; 126 t->_dmamem_free = _bus_dmamem_free; 127 t->_dmamem_map = _bus_dmamem_map; 128 t->_dmamem_unmap = _bus_dmamem_unmap; 129 t->_dmamem_mmap = _bus_dmamem_mmap; 130 131 /* 132 * Initialize the DMA tag used for sgmap-mapped DMA. 133 */ 134 t = &acp->ac_dmat_sgmap; 135 t->_cookie = acp; 136 t->_wbase = APECS_SGMAP_MAPPED_BASE; 137 t->_wsize = APECS_SGMAP_MAPPED_SIZE; 138 t->_next_window = NULL; 139 t->_boundary = 0; 140 t->_sgmap = &acp->ac_sgmap; 141 t->_get_tag = apecs_dma_get_tag; 142 t->_dmamap_create = alpha_sgmap_dmamap_create; 143 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 144 t->_dmamap_load = apecs_bus_dmamap_load_sgmap; 145 t->_dmamap_load_mbuf = apecs_bus_dmamap_load_mbuf_sgmap; 146 t->_dmamap_load_uio = apecs_bus_dmamap_load_uio_sgmap; 147 t->_dmamap_load_raw = apecs_bus_dmamap_load_raw_sgmap; 148 t->_dmamap_unload = apecs_bus_dmamap_unload_sgmap; 149 t->_dmamap_sync = _bus_dmamap_sync; 150 151 t->_dmamem_alloc = _bus_dmamem_alloc; 152 t->_dmamem_free = _bus_dmamem_free; 153 t->_dmamem_map = _bus_dmamem_map; 154 t->_dmamem_unmap = _bus_dmamem_unmap; 155 t->_dmamem_mmap = _bus_dmamem_mmap; 156 157 /* 158 * The firmware has set up window 2 as a 1G direct-mapped DMA 159 * window beginning at 1G. We leave it alone. Disable 160 * window 1. 161 */ 162 REGVAL(EPIC_PCI_BASE_1) = 0; 163 alpha_mb(); 164 165 /* 166 * Initialize the SGMAP. 167 */ 168 alpha_sgmap_init(t, &acp->ac_sgmap, "apecs_sgmap", 169 APECS_SGMAP_MAPPED_BASE, 0, APECS_SGMAP_MAPPED_SIZE, 170 sizeof(u_int64_t), NULL, 0); 171 172 /* 173 * Set up window 1 as an 8MB SGMAP-mapped window 174 * starting at 8MB. 175 */ 176 REGVAL(EPIC_PCI_BASE_1) = APECS_SGMAP_MAPPED_BASE | 177 EPIC_PCI_BASE_SGEN | EPIC_PCI_BASE_WENB; 178 alpha_mb(); 179 180 REGVAL(EPIC_PCI_MASK_1) = EPIC_PCI_MASK_8M; 181 alpha_mb(); 182 183 tbase = acp->ac_sgmap.aps_ptpa >> EPIC_TBASE_SHIFT; 184 if ((tbase & EPIC_TBASE_T_BASE) != tbase) 185 panic("apecs_dma_init: bad page table address"); 186 REGVAL(EPIC_TBASE_1) = tbase; 187 alpha_mb(); 188 189 APECS_TLB_INVALIDATE(); 190 191 /* XXX XXX BEGIN XXX XXX */ 192 { /* XXX */ 193 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 194 alpha_XXX_dmamap_or = APECS_DIRECT_MAPPED_BASE; /* XXX */ 195 } /* XXX */ 196 /* XXX XXX END XXX XXX */ 197 } 198 199 /* 200 * Return the bus dma tag to be used for the specified bus type. 201 * INTERNAL USE ONLY! 202 */ 203 bus_dma_tag_t 204 apecs_dma_get_tag(t, bustype) 205 bus_dma_tag_t t; 206 alpha_bus_t bustype; 207 { 208 struct apecs_config *acp = t->_cookie; 209 210 switch (bustype) { 211 case ALPHA_BUS_PCI: 212 case ALPHA_BUS_EISA: 213 /* 214 * Systems with an APECS can only support 1G 215 * of memory, so we use the direct-mapped window 216 * on busses that have 32-bit DMA. 217 */ 218 return (&acp->ac_dmat_direct); 219 220 case ALPHA_BUS_ISA: 221 /* 222 * ISA doesn't have enough address bits to use 223 * the direct-mapped DMA window, so we must use 224 * SGMAPs. 225 */ 226 return (&acp->ac_dmat_sgmap); 227 228 default: 229 panic("apecs_dma_get_tag: shouldn't be here, really..."); 230 } 231 } 232 233 /* 234 * Load an APECS SGMAP-mapped DMA map with a linear buffer. 235 */ 236 int 237 apecs_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 238 bus_dma_tag_t t; 239 bus_dmamap_t map; 240 void *buf; 241 bus_size_t buflen; 242 struct proc *p; 243 int flags; 244 { 245 int error; 246 247 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 248 t->_sgmap); 249 if (error == 0) 250 APECS_TLB_INVALIDATE(); 251 252 return (error); 253 } 254 255 /* 256 * Load an APECS SGMAP-mapped DMA map with an mbuf chain. 257 */ 258 int 259 apecs_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 260 bus_dma_tag_t t; 261 bus_dmamap_t map; 262 struct mbuf *m; 263 int flags; 264 { 265 int error; 266 267 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 268 if (error == 0) 269 APECS_TLB_INVALIDATE(); 270 271 return (error); 272 } 273 274 /* 275 * Load an APECS SGMAP-mapped DMA map with a uio. 276 */ 277 int 278 apecs_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 279 bus_dma_tag_t t; 280 bus_dmamap_t map; 281 struct uio *uio; 282 int flags; 283 { 284 int error; 285 286 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 287 if (error == 0) 288 APECS_TLB_INVALIDATE(); 289 290 return (error); 291 } 292 293 /* 294 * Load an APECS SGMAP-mapped DMA map with raw memory. 295 */ 296 int 297 apecs_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 298 bus_dma_tag_t t; 299 bus_dmamap_t map; 300 bus_dma_segment_t *segs; 301 int nsegs; 302 bus_size_t size; 303 int flags; 304 { 305 int error; 306 307 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 308 t->_sgmap); 309 if (error == 0) 310 APECS_TLB_INVALIDATE(); 311 312 return (error); 313 } 314 315 /* 316 * Unload an APECS DMA map. 317 */ 318 void 319 apecs_bus_dmamap_unload_sgmap(t, map) 320 bus_dma_tag_t t; 321 bus_dmamap_t map; 322 { 323 324 /* 325 * Invalidate any SGMAP page table entries used by this 326 * mapping. 327 */ 328 pci_sgmap_pte64_unload(t, map, t->_sgmap); 329 APECS_TLB_INVALIDATE(); 330 331 /* 332 * Do the generic bits of the unload. 333 */ 334 _bus_dmamap_unload(t, map); 335 } 336
Indexes created Mon Sep 29 03:10:08 GMT 2025