lca_dma.c revision 1.16
1 /* $NetBSD: lca_dma.c,v 1.16 2004/07/02 19:54:22 mycroft 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 1.16 2004/07/02 19:54:22 mycroft 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 /* Initialize window 1 as a direct-mapped window. */ 164 REGVAL64(LCA_IOC_W_BASE1) = LCA_DIRECT_MAPPED_BASE | IOC_W_BASE_WEN; 165 REGVAL64(LCA_IOC_W_MASK1) = IOC_W_MASK_1G; 166 alpha_mb(); 167 168 /* Disable window 0 while we set it up. */ 169 REGVAL64(LCA_IOC_W_BASE0) = 0; 170 alpha_mb(); 171 172 /* 173 * Initialize the SGMAP. 174 */ 175 alpha_sgmap_init(t, &lcp->lc_sgmap, "lca_sgmap", 176 LCA_SGMAP_MAPPED_BASE, 0, LCA_SGMAP_MAPPED_SIZE, 177 sizeof(u_int64_t), NULL, 0); 178 179 /* 180 * Set up window 0 as an 8MB SGMAP-mapped window 181 * starting at 8MB. 182 */ 183 REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_MAPPED_BASE | 184 IOC_W_BASE_SG | IOC_W_BASE_WEN; 185 REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M; 186 alpha_mb(); 187 188 if ((lcp->lc_sgmap.aps_ptpa & IOC_W_T_BASE) != 189 lcp->lc_sgmap.aps_ptpa) 190 panic("lca_dma_init: bad page table address"); 191 REGVAL64(LCA_IOC_W_T_BASE0) = lcp->lc_sgmap.aps_ptpa; 192 alpha_mb(); 193 194 /* Enble the scatter/gather TLB. */ 195 REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN; 196 alpha_mb(); 197 198 LCA_TLB_INVALIDATE(); 199 200 /* XXX XXX BEGIN XXX XXX */ 201 { /* XXX */ 202 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 203 alpha_XXX_dmamap_or = LCA_DIRECT_MAPPED_BASE; /* XXX */ 204 } /* XXX */ 205 /* XXX XXX END XXX XXX */ 206 } 207 208 /* 209 * Return the bus dma tag to be used for the specified bus type. 210 * INTERNAL USE ONLY! 211 */ 212 bus_dma_tag_t 213 lca_dma_get_tag(t, bustype) 214 bus_dma_tag_t t; 215 alpha_bus_t bustype; 216 { 217 struct lca_config *lcp = t->_cookie; 218 219 switch (bustype) { 220 case ALPHA_BUS_PCI: 221 case ALPHA_BUS_EISA: 222 /* 223 * Systems with an LCA can only support 1G 224 * of memory, so we use the direct-mapped window 225 * on busses that have 32-bit DMA. 226 */ 227 return (&lcp->lc_dmat_direct); 228 229 case ALPHA_BUS_ISA: 230 /* 231 * ISA doesn't have enough address bits to use 232 * the direct-mapped DMA window, so we must use 233 * SGMAPs. 234 */ 235 return (&lcp->lc_dmat_sgmap); 236 237 default: 238 panic("lca_dma_get_tag: shouldn't be here, really..."); 239 } 240 } 241 242 /* 243 * Load an LCA SGMAP-mapped DMA map with a linear buffer. 244 */ 245 int 246 lca_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 247 bus_dma_tag_t t; 248 bus_dmamap_t map; 249 void *buf; 250 bus_size_t buflen; 251 struct proc *p; 252 int flags; 253 { 254 int error; 255 256 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 257 t->_sgmap); 258 if (error == 0) 259 LCA_TLB_INVALIDATE(); 260 261 return (error); 262 } 263 264 /* 265 * Load an LCA SGMAP-mapped DMA map with an mbuf chain. 266 */ 267 int 268 lca_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 269 bus_dma_tag_t t; 270 bus_dmamap_t map; 271 struct mbuf *m; 272 int flags; 273 { 274 int error; 275 276 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 277 if (error == 0) 278 LCA_TLB_INVALIDATE(); 279 280 return (error); 281 } 282 283 /* 284 * Load an LCA SGMAP-mapped DMA map with a uio. 285 */ 286 int 287 lca_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 288 bus_dma_tag_t t; 289 bus_dmamap_t map; 290 struct uio *uio; 291 int flags; 292 { 293 int error; 294 295 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 296 if (error == 0) 297 LCA_TLB_INVALIDATE(); 298 299 return (error); 300 } 301 302 /* 303 * Load an LCA SGMAP-mapped DMA map with raw memory. 304 */ 305 int 306 lca_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 307 bus_dma_tag_t t; 308 bus_dmamap_t map; 309 bus_dma_segment_t *segs; 310 int nsegs; 311 bus_size_t size; 312 int flags; 313 { 314 int error; 315 316 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 317 t->_sgmap); 318 if (error == 0) 319 LCA_TLB_INVALIDATE(); 320 321 return (error); 322 } 323 324 /* 325 * Unload an LCA DMA map. 326 */ 327 void 328 lca_bus_dmamap_unload_sgmap(t, map) 329 bus_dma_tag_t t; 330 bus_dmamap_t map; 331 { 332 333 /* 334 * Invalidate any SGMAP page table entries used by this 335 * mapping. 336 */ 337 pci_sgmap_pte64_unload(t, map, t->_sgmap); 338 LCA_TLB_INVALIDATE(); 339 340 /* 341 * Do the generic bits of the unload. 342 */ 343 _bus_dmamap_unload(t, map); 344 } 345
Indexes created Tue Sep 30 06:09:59 GMT 2025