1 /* $OpenBSD: apecs_dma.c,v 1.7 2009/02/01 14:34:00 miod Exp $ */ 2 /* $NetBSD: apecs_dma.c,v 1.13 2000/06/29 08:58:45 mrg Exp $ */ 3 4 /*- 5 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 10 * NASA Ames Research Center. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * XXX - We should define this before including bus.h, but since other stuff 36 * pulls in bus.h we must do this here. 37 */ 38 #define _ALPHA_BUS_DMA_PRIVATE 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/device.h> 44 #include <sys/malloc.h> 45 46 #include <uvm/uvm_extern.h> 47 48 #include <machine/bus.h> 49 50 #include <dev/pci/pcireg.h> 51 #include <dev/pci/pcivar.h> 52 #include <alpha/pci/apecsreg.h> 53 #include <alpha/pci/apecsvar.h> 54 55 bus_dma_tag_t apecs_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 56 57 int apecs_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 58 bus_size_t, struct proc *, int); 59 60 int apecs_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 61 struct mbuf *, int); 62 63 int apecs_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 64 struct uio *, int); 65 66 int apecs_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 67 bus_dma_segment_t *, int, bus_size_t, int); 68 69 void apecs_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 70 71 /* 72 * Direct-mapped window: 1G at 1G 73 */ 74 #define APECS_DIRECT_MAPPED_BASE (1*1024*1024*1024) 75 #define APECS_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 76 77 /* 78 * SGMAP window: 8M at 8M 79 */ 80 #define APECS_SGMAP_MAPPED_BASE (8*1024*1024) 81 #define APECS_SGMAP_MAPPED_SIZE (8*1024*1024) 82 83 /* 84 * Macro to flush APECS scatter/gather TLB. 85 */ 86 #define APECS_TLB_INVALIDATE() \ 87 do { \ 88 alpha_mb(); \ 89 REGVAL(EPIC_TBIA) = 0; \ 90 alpha_mb(); \ 91 } while (0) 92 93 void 94 apecs_dma_init(acp) 95 struct apecs_config *acp; 96 { 97 bus_addr_t tbase; 98 bus_dma_tag_t t; 99 100 /* 101 * Initialize the DMA tag used for direct-mapped DMA. 102 */ 103 t = &acp->ac_dmat_direct; 104 t->_cookie = acp; 105 t->_wbase = APECS_DIRECT_MAPPED_BASE; 106 t->_wsize = APECS_DIRECT_MAPPED_SIZE; 107 t->_next_window = NULL; 108 t->_boundary = 0; 109 t->_sgmap = NULL; 110 t->_get_tag = apecs_dma_get_tag; 111 t->_dmamap_create = _bus_dmamap_create; 112 t->_dmamap_destroy = _bus_dmamap_destroy; 113 t->_dmamap_load = _bus_dmamap_load_direct; 114 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 115 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 116 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 117 t->_dmamap_unload = _bus_dmamap_unload; 118 t->_dmamap_sync = _bus_dmamap_sync; 119 120 t->_dmamem_alloc = _bus_dmamem_alloc; 121 t->_dmamem_free = _bus_dmamem_free; 122 t->_dmamem_map = _bus_dmamem_map; 123 t->_dmamem_unmap = _bus_dmamem_unmap; 124 t->_dmamem_mmap = _bus_dmamem_mmap; 125 126 /* 127 * Initialize the DMA tag used for sgmap-mapped DMA. 128 */ 129 t = &acp->ac_dmat_sgmap; 130 t->_cookie = acp; 131 t->_wbase = APECS_SGMAP_MAPPED_BASE; 132 t->_wsize = APECS_SGMAP_MAPPED_SIZE; 133 t->_next_window = NULL; 134 t->_boundary = 0; 135 t->_sgmap = &acp->ac_sgmap; 136 t->_get_tag = apecs_dma_get_tag; 137 t->_dmamap_create = alpha_sgmap_dmamap_create; 138 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 139 t->_dmamap_load = apecs_bus_dmamap_load_sgmap; 140 t->_dmamap_load_mbuf = apecs_bus_dmamap_load_mbuf_sgmap; 141 t->_dmamap_load_uio = apecs_bus_dmamap_load_uio_sgmap; 142 t->_dmamap_load_raw = apecs_bus_dmamap_load_raw_sgmap; 143 t->_dmamap_unload = apecs_bus_dmamap_unload_sgmap; 144 t->_dmamap_sync = _bus_dmamap_sync; 145 146 t->_dmamem_alloc = _bus_dmamem_alloc; 147 t->_dmamem_free = _bus_dmamem_free; 148 t->_dmamem_map = _bus_dmamem_map; 149 t->_dmamem_unmap = _bus_dmamem_unmap; 150 t->_dmamem_mmap = _bus_dmamem_mmap; 151 152 /* 153 * The firmware has set up window 2 as a 1G direct-mapped DMA 154 * window beginning at 1G. We leave it alone. Disable 155 * window 1. 156 */ 157 REGVAL(EPIC_PCI_BASE_1) = 0; 158 alpha_mb(); 159 160 /* 161 * Initialize the SGMAP. 162 */ 163 alpha_sgmap_init(t, &acp->ac_sgmap, "apecs_sgmap", 164 APECS_SGMAP_MAPPED_BASE, 0, APECS_SGMAP_MAPPED_SIZE, 165 sizeof(u_int64_t), NULL, 0); 166 167 /* 168 * Set up window 1 as an 8MB SGMAP-mapped window 169 * starting at 8MB. 170 */ 171 REGVAL(EPIC_PCI_BASE_1) = APECS_SGMAP_MAPPED_BASE | 172 EPIC_PCI_BASE_SGEN | EPIC_PCI_BASE_WENB; 173 alpha_mb(); 174 175 REGVAL(EPIC_PCI_MASK_1) = EPIC_PCI_MASK_8M; 176 alpha_mb(); 177 178 tbase = acp->ac_sgmap.aps_ptpa >> EPIC_TBASE_SHIFT; 179 if ((tbase & EPIC_TBASE_T_BASE) != tbase) 180 panic("apecs_dma_init: bad page table address"); 181 REGVAL(EPIC_TBASE_1) = tbase; 182 alpha_mb(); 183 184 APECS_TLB_INVALIDATE(); 185 186 /* XXX XXX BEGIN XXX XXX */ 187 { /* XXX */ 188 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 189 alpha_XXX_dmamap_or = APECS_DIRECT_MAPPED_BASE; /* XXX */ 190 } /* XXX */ 191 /* XXX XXX END XXX XXX */ 192 } 193 194 /* 195 * Return the bus dma tag to be used for the specified bus type. 196 * INTERNAL USE ONLY! 197 */ 198 bus_dma_tag_t 199 apecs_dma_get_tag(t, bustype) 200 bus_dma_tag_t t; 201 alpha_bus_t bustype; 202 { 203 struct apecs_config *acp = t->_cookie; 204 205 switch (bustype) { 206 case ALPHA_BUS_PCI: 207 case ALPHA_BUS_EISA: 208 /* 209 * Systems with an APECS can only support 1G 210 * of memory, so we use the direct-mapped window 211 * on busses that have 32-bit DMA. 212 */ 213 return (&acp->ac_dmat_direct); 214 215 case ALPHA_BUS_ISA: 216 /* 217 * ISA doesn't have enough address bits to use 218 * the direct-mapped DMA window, so we must use 219 * SGMAPs. 220 */ 221 return (&acp->ac_dmat_sgmap); 222 223 default: 224 panic("apecs_dma_get_tag: shouldn't be here, really..."); 225 } 226 } 227 228 /* 229 * Load an APECS SGMAP-mapped DMA map with a linear buffer. 230 */ 231 int 232 apecs_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 233 bus_dma_tag_t t; 234 bus_dmamap_t map; 235 void *buf; 236 bus_size_t buflen; 237 struct proc *p; 238 int flags; 239 { 240 int error; 241 242 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 243 t->_sgmap); 244 if (error == 0) 245 APECS_TLB_INVALIDATE(); 246 247 return (error); 248 } 249 250 /* 251 * Load an APECS SGMAP-mapped DMA map with an mbuf chain. 252 */ 253 int 254 apecs_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 255 bus_dma_tag_t t; 256 bus_dmamap_t map; 257 struct mbuf *m; 258 int flags; 259 { 260 int error; 261 262 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 263 if (error == 0) 264 APECS_TLB_INVALIDATE(); 265 266 return (error); 267 } 268 269 /* 270 * Load an APECS SGMAP-mapped DMA map with a uio. 271 */ 272 int 273 apecs_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 274 bus_dma_tag_t t; 275 bus_dmamap_t map; 276 struct uio *uio; 277 int flags; 278 { 279 int error; 280 281 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 282 if (error == 0) 283 APECS_TLB_INVALIDATE(); 284 285 return (error); 286 } 287 288 /* 289 * Load an APECS SGMAP-mapped DMA map with raw memory. 290 */ 291 int 292 apecs_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 293 bus_dma_tag_t t; 294 bus_dmamap_t map; 295 bus_dma_segment_t *segs; 296 int nsegs; 297 bus_size_t size; 298 int flags; 299 { 300 int error; 301 302 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 303 t->_sgmap); 304 if (error == 0) 305 APECS_TLB_INVALIDATE(); 306 307 return (error); 308 } 309 310 /* 311 * Unload an APECS DMA map. 312 */ 313 void 314 apecs_bus_dmamap_unload_sgmap(t, map) 315 bus_dma_tag_t t; 316 bus_dmamap_t map; 317 { 318 319 /* 320 * Invalidate any SGMAP page table entries used by this 321 * mapping. 322 */ 323 pci_sgmap_pte64_unload(t, map, t->_sgmap); 324 APECS_TLB_INVALIDATE(); 325 326 /* 327 * Do the generic bits of the unload. 328 */ 329 _bus_dmamap_unload(t, map); 330 } 331