lca_dma.c revision 1.15
1 /* $NetBSD: lca_dma.c,v 1.15 2001/07/19 18:47:38 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: lca_dma.c,v 1.15 2001/07/19 18:47:38 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/lcareg.h> 58 #include <alpha/pci/lcavar.h> 59 60 bus_dma_tag_t lca_dma_get_tag __P((bus_dma_tag_t, alpha_bus_t)); 61 62 int lca_bus_dmamap_load_sgmap __P((bus_dma_tag_t, bus_dmamap_t, void *, 63 bus_size_t, struct proc *, int)); 64 65 int lca_bus_dmamap_load_mbuf_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 66 struct mbuf *, int)); 67 68 int lca_bus_dmamap_load_uio_sgmap __P((bus_dma_tag_t, bus_dmamap_t, 69 struct uio *, int)); 70 71 int lca_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 lca_bus_dmamap_unload_sgmap __P((bus_dma_tag_t, bus_dmamap_t)); 75 76 /* 77 * Direct-mapped window: 1G at 1G 78 */ 79 #define LCA_DIRECT_MAPPED_BASE (1*1024*1024*1024) 80 #define LCA_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 81 82 /* 83 * SGMAP window: 8M at 8M 84 */ 85 #define LCA_SGMAP_MAPPED_BASE (8*1024*1024) 86 #define LCA_SGMAP_MAPPED_SIZE (8*1024*1024) 87 88 /* 89 * The LCA doesn't have a DMA prefetch threshold. However, it is known 90 * to lose if we don't allocate a spill page. So initialize it to 256. 91 */ 92 #define LCA_SGMAP_PFTHRESH 256 93 94 /* 95 * Macro to flush LCA scatter/gather TLB. 96 */ 97 #define LCA_TLB_INVALIDATE() \ 98 do { \ 99 alpha_mb(); \ 100 REGVAL64(LCA_IOC_TBIA) = 0; \ 101 alpha_mb(); \ 102 } while (0) 103 104 void 105 lca_dma_init(lcp) 106 struct lca_config *lcp; 107 { 108 bus_dma_tag_t t; 109 110 /* 111 * Initialize the DMA tag used for direct-mapped DMA. 112 */ 113 t = &lcp->lc_dmat_direct; 114 t->_cookie = lcp; 115 t->_wbase = LCA_DIRECT_MAPPED_BASE; 116 t->_wsize = LCA_DIRECT_MAPPED_SIZE; 117 t->_next_window = NULL; 118 t->_boundary = 0; 119 t->_sgmap = NULL; 120 t->_get_tag = lca_dma_get_tag; 121 t->_dmamap_create = _bus_dmamap_create; 122 t->_dmamap_destroy = _bus_dmamap_destroy; 123 t->_dmamap_load = _bus_dmamap_load_direct; 124 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 125 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 126 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 127 t->_dmamap_unload = _bus_dmamap_unload; 128 t->_dmamap_sync = _bus_dmamap_sync; 129 130 t->_dmamem_alloc = _bus_dmamem_alloc; 131 t->_dmamem_free = _bus_dmamem_free; 132 t->_dmamem_map = _bus_dmamem_map; 133 t->_dmamem_unmap = _bus_dmamem_unmap; 134 t->_dmamem_mmap = _bus_dmamem_mmap; 135 136 /* 137 * Initialize the DMA tag used for sgmap-mapped DMA. 138 */ 139 t = &lcp->lc_dmat_sgmap; 140 t->_cookie = lcp; 141 t->_wbase = LCA_SGMAP_MAPPED_BASE; 142 t->_wsize = LCA_SGMAP_MAPPED_SIZE; 143 t->_next_window = NULL; 144 t->_boundary = 0; 145 t->_sgmap = &lcp->lc_sgmap; 146 t->_pfthresh = LCA_SGMAP_PFTHRESH; 147 t->_get_tag = lca_dma_get_tag; 148 t->_dmamap_create = alpha_sgmap_dmamap_create; 149 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 150 t->_dmamap_load = lca_bus_dmamap_load_sgmap; 151 t->_dmamap_load_mbuf = lca_bus_dmamap_load_mbuf_sgmap; 152 t->_dmamap_load_uio = lca_bus_dmamap_load_uio_sgmap; 153 t->_dmamap_load_raw = lca_bus_dmamap_load_raw_sgmap; 154 t->_dmamap_unload = lca_bus_dmamap_unload_sgmap; 155 t->_dmamap_sync = _bus_dmamap_sync; 156 157 t->_dmamem_alloc = _bus_dmamem_alloc; 158 t->_dmamem_free = _bus_dmamem_free; 159 t->_dmamem_map = _bus_dmamem_map; 160 t->_dmamem_unmap = _bus_dmamem_unmap; 161 t->_dmamem_mmap = _bus_dmamem_mmap; 162 163 /* 164 * The firmware has set up window 1 as a 1G direct-mapped DMA 165 * window beginning at 1G. We leave it alone. Disable 166 * window 0. 167 */ 168 REGVAL64(LCA_IOC_W_BASE0) = 0; 169 alpha_mb(); 170 171 /* 172 * Initialize the SGMAP. 173 */ 174 alpha_sgmap_init(t, &lcp->lc_sgmap, "lca_sgmap", 175 LCA_SGMAP_MAPPED_BASE, 0, LCA_SGMAP_MAPPED_SIZE, 176 sizeof(u_int64_t), NULL, 0); 177 178 /* 179 * Set up window 0 as an 8MB SGMAP-mapped window 180 * starting at 8MB. 181 */ 182 REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_MAPPED_BASE | 183 IOC_W_BASE_SG | IOC_W_BASE_WEN; 184 alpha_mb(); 185 186 REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M; 187 alpha_mb(); 188 189 if ((lcp->lc_sgmap.aps_ptpa & IOC_W_T_BASE) != 190 lcp->lc_sgmap.aps_ptpa) 191 panic("lca_dma_init: bad page table address"); 192 REGVAL64(LCA_IOC_W_T_BASE0) = lcp->lc_sgmap.aps_ptpa; 193 alpha_mb(); 194 195 /* Enble the scatter/gather TLB. */ 196 REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN; 197 alpha_mb(); 198 199 LCA_TLB_INVALIDATE(); 200 201 /* XXX XXX BEGIN XXX XXX */ 202 { /* XXX */ 203 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 204 alpha_XXX_dmamap_or = LCA_DIRECT_MAPPED_BASE; /* XXX */ 205 } /* XXX */ 206 /* XXX XXX END XXX XXX */ 207 } 208 209 /* 210 * Return the bus dma tag to be used for the specified bus type. 211 * INTERNAL USE ONLY! 212 */ 213 bus_dma_tag_t 214 lca_dma_get_tag(t, bustype) 215 bus_dma_tag_t t; 216 alpha_bus_t bustype; 217 { 218 struct lca_config *lcp = t->_cookie; 219 220 switch (bustype) { 221 case ALPHA_BUS_PCI: 222 case ALPHA_BUS_EISA: 223 /* 224 * Systems with an LCA can only support 1G 225 * of memory, so we use the direct-mapped window 226 * on busses that have 32-bit DMA. 227 */ 228 return (&lcp->lc_dmat_direct); 229 230 case ALPHA_BUS_ISA: 231 /* 232 * ISA doesn't have enough address bits to use 233 * the direct-mapped DMA window, so we must use 234 * SGMAPs. 235 */ 236 return (&lcp->lc_dmat_sgmap); 237 238 default: 239 panic("lca_dma_get_tag: shouldn't be here, really..."); 240 } 241 } 242 243 /* 244 * Load an LCA SGMAP-mapped DMA map with a linear buffer. 245 */ 246 int 247 lca_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 248 bus_dma_tag_t t; 249 bus_dmamap_t map; 250 void *buf; 251 bus_size_t buflen; 252 struct proc *p; 253 int flags; 254 { 255 int error; 256 257 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 258 t->_sgmap); 259 if (error == 0) 260 LCA_TLB_INVALIDATE(); 261 262 return (error); 263 } 264 265 /* 266 * Load an LCA SGMAP-mapped DMA map with an mbuf chain. 267 */ 268 int 269 lca_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 270 bus_dma_tag_t t; 271 bus_dmamap_t map; 272 struct mbuf *m; 273 int flags; 274 { 275 int error; 276 277 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 278 if (error == 0) 279 LCA_TLB_INVALIDATE(); 280 281 return (error); 282 } 283 284 /* 285 * Load an LCA SGMAP-mapped DMA map with a uio. 286 */ 287 int 288 lca_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 289 bus_dma_tag_t t; 290 bus_dmamap_t map; 291 struct uio *uio; 292 int flags; 293 { 294 int error; 295 296 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 297 if (error == 0) 298 LCA_TLB_INVALIDATE(); 299 300 return (error); 301 } 302 303 /* 304 * Load an LCA SGMAP-mapped DMA map with raw memory. 305 */ 306 int 307 lca_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 308 bus_dma_tag_t t; 309 bus_dmamap_t map; 310 bus_dma_segment_t *segs; 311 int nsegs; 312 bus_size_t size; 313 int flags; 314 { 315 int error; 316 317 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 318 t->_sgmap); 319 if (error == 0) 320 LCA_TLB_INVALIDATE(); 321 322 return (error); 323 } 324 325 /* 326 * Unload an LCA DMA map. 327 */ 328 void 329 lca_bus_dmamap_unload_sgmap(t, map) 330 bus_dma_tag_t t; 331 bus_dmamap_t map; 332 { 333 334 /* 335 * Invalidate any SGMAP page table entries used by this 336 * mapping. 337 */ 338 pci_sgmap_pte64_unload(t, map, t->_sgmap); 339 LCA_TLB_INVALIDATE(); 340 341 /* 342 * Do the generic bits of the unload. 343 */ 344 _bus_dmamap_unload(t, map); 345 } 346
Indexes created Tue Sep 30 17:09:57 GMT 2025