lca_dma.c revision 1.19
1 /* $NetBSD: lca_dma.c,v 1.19 2009/03/14 14:45:53 dsl 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 34 35 __KERNEL_RCSID(0, "$NetBSD: lca_dma.c,v 1.19 2009/03/14 14:45:53 dsl Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/device.h> 41 #include <sys/malloc.h> 42 43 #include <uvm/uvm_extern.h> 44 45 #define _ALPHA_BUS_DMA_PRIVATE 46 #include <machine/bus.h> 47 48 #include <dev/pci/pcireg.h> 49 #include <dev/pci/pcivar.h> 50 #include <alpha/pci/lcareg.h> 51 #include <alpha/pci/lcavar.h> 52 53 bus_dma_tag_t lca_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 54 55 int lca_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 56 bus_size_t, struct proc *, int); 57 58 int lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 59 struct mbuf *, int); 60 61 int lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 62 struct uio *, int); 63 64 int lca_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 65 bus_dma_segment_t *, int, bus_size_t, int); 66 67 void lca_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 68 69 /* 70 * Direct-mapped window: 1G at 1G 71 */ 72 #define LCA_DIRECT_MAPPED_BASE (1*1024*1024*1024) 73 #define LCA_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 74 75 /* 76 * SGMAP window: 8M at 8M 77 */ 78 #define LCA_SGMAP_MAPPED_BASE (8*1024*1024) 79 #define LCA_SGMAP_MAPPED_SIZE (8*1024*1024) 80 81 /* 82 * The LCA doesn't have a DMA prefetch threshold. However, it is known 83 * to lose if we don't allocate a spill page. So initialize it to 256. 84 */ 85 #define LCA_SGMAP_PFTHRESH 256 86 87 /* 88 * Macro to flush LCA scatter/gather TLB. 89 */ 90 #define LCA_TLB_INVALIDATE() \ 91 do { \ 92 alpha_mb(); \ 93 REGVAL64(LCA_IOC_TBIA) = 0; \ 94 alpha_mb(); \ 95 } while (0) 96 97 void 98 lca_dma_init(lcp) 99 struct lca_config *lcp; 100 { 101 bus_dma_tag_t t; 102 103 /* 104 * Initialize the DMA tag used for direct-mapped DMA. 105 */ 106 t = &lcp->lc_dmat_direct; 107 t->_cookie = lcp; 108 t->_wbase = LCA_DIRECT_MAPPED_BASE; 109 t->_wsize = LCA_DIRECT_MAPPED_SIZE; 110 t->_next_window = NULL; 111 t->_boundary = 0; 112 t->_sgmap = NULL; 113 t->_get_tag = lca_dma_get_tag; 114 t->_dmamap_create = _bus_dmamap_create; 115 t->_dmamap_destroy = _bus_dmamap_destroy; 116 t->_dmamap_load = _bus_dmamap_load_direct; 117 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 118 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 119 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 120 t->_dmamap_unload = _bus_dmamap_unload; 121 t->_dmamap_sync = _bus_dmamap_sync; 122 123 t->_dmamem_alloc = _bus_dmamem_alloc; 124 t->_dmamem_free = _bus_dmamem_free; 125 t->_dmamem_map = _bus_dmamem_map; 126 t->_dmamem_unmap = _bus_dmamem_unmap; 127 t->_dmamem_mmap = _bus_dmamem_mmap; 128 129 /* 130 * Initialize the DMA tag used for sgmap-mapped DMA. 131 */ 132 t = &lcp->lc_dmat_sgmap; 133 t->_cookie = lcp; 134 t->_wbase = LCA_SGMAP_MAPPED_BASE; 135 t->_wsize = LCA_SGMAP_MAPPED_SIZE; 136 t->_next_window = NULL; 137 t->_boundary = 0; 138 t->_sgmap = &lcp->lc_sgmap; 139 t->_pfthresh = LCA_SGMAP_PFTHRESH; 140 t->_get_tag = lca_dma_get_tag; 141 t->_dmamap_create = alpha_sgmap_dmamap_create; 142 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 143 t->_dmamap_load = lca_bus_dmamap_load_sgmap; 144 t->_dmamap_load_mbuf = lca_bus_dmamap_load_mbuf_sgmap; 145 t->_dmamap_load_uio = lca_bus_dmamap_load_uio_sgmap; 146 t->_dmamap_load_raw = lca_bus_dmamap_load_raw_sgmap; 147 t->_dmamap_unload = lca_bus_dmamap_unload_sgmap; 148 t->_dmamap_sync = _bus_dmamap_sync; 149 150 t->_dmamem_alloc = _bus_dmamem_alloc; 151 t->_dmamem_free = _bus_dmamem_free; 152 t->_dmamem_map = _bus_dmamem_map; 153 t->_dmamem_unmap = _bus_dmamem_unmap; 154 t->_dmamem_mmap = _bus_dmamem_mmap; 155 156 /* Initialize window 1 as a direct-mapped window. */ 157 REGVAL64(LCA_IOC_W_BASE1) = LCA_DIRECT_MAPPED_BASE | IOC_W_BASE_WEN; 158 REGVAL64(LCA_IOC_W_MASK1) = IOC_W_MASK_1G; 159 alpha_mb(); 160 161 /* Disable window 0 while we set it up. */ 162 REGVAL64(LCA_IOC_W_BASE0) = 0; 163 alpha_mb(); 164 165 /* 166 * Initialize the SGMAP. 167 */ 168 alpha_sgmap_init(t, &lcp->lc_sgmap, "lca_sgmap", 169 LCA_SGMAP_MAPPED_BASE, 0, LCA_SGMAP_MAPPED_SIZE, 170 sizeof(u_int64_t), NULL, 0); 171 172 /* 173 * Set up window 0 as an 8MB SGMAP-mapped window 174 * starting at 8MB. 175 */ 176 REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_MAPPED_BASE | 177 IOC_W_BASE_SG | IOC_W_BASE_WEN; 178 REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M; 179 alpha_mb(); 180 181 if ((lcp->lc_sgmap.aps_ptpa & IOC_W_T_BASE) != 182 lcp->lc_sgmap.aps_ptpa) 183 panic("lca_dma_init: bad page table address"); 184 REGVAL64(LCA_IOC_W_T_BASE0) = lcp->lc_sgmap.aps_ptpa; 185 alpha_mb(); 186 187 /* Enble the scatter/gather TLB. */ 188 REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN; 189 alpha_mb(); 190 191 LCA_TLB_INVALIDATE(); 192 193 /* XXX XXX BEGIN XXX XXX */ 194 { /* XXX */ 195 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 196 alpha_XXX_dmamap_or = LCA_DIRECT_MAPPED_BASE; /* XXX */ 197 } /* XXX */ 198 /* XXX XXX END XXX XXX */ 199 } 200 201 /* 202 * Return the bus dma tag to be used for the specified bus type. 203 * INTERNAL USE ONLY! 204 */ 205 bus_dma_tag_t 206 lca_dma_get_tag(t, bustype) 207 bus_dma_tag_t t; 208 alpha_bus_t bustype; 209 { 210 struct lca_config *lcp = t->_cookie; 211 212 switch (bustype) { 213 case ALPHA_BUS_PCI: 214 case ALPHA_BUS_EISA: 215 /* 216 * Systems with an LCA can only support 1G 217 * of memory, so we use the direct-mapped window 218 * on busses that have 32-bit DMA. 219 */ 220 return (&lcp->lc_dmat_direct); 221 222 case ALPHA_BUS_ISA: 223 /* 224 * ISA doesn't have enough address bits to use 225 * the direct-mapped DMA window, so we must use 226 * SGMAPs. 227 */ 228 return (&lcp->lc_dmat_sgmap); 229 230 default: 231 panic("lca_dma_get_tag: shouldn't be here, really..."); 232 } 233 } 234 235 /* 236 * Load an LCA SGMAP-mapped DMA map with a linear buffer. 237 */ 238 int 239 lca_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 240 bus_dma_tag_t t; 241 bus_dmamap_t map; 242 void *buf; 243 bus_size_t buflen; 244 struct proc *p; 245 int flags; 246 { 247 int error; 248 249 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 250 t->_sgmap); 251 if (error == 0) 252 LCA_TLB_INVALIDATE(); 253 254 return (error); 255 } 256 257 /* 258 * Load an LCA SGMAP-mapped DMA map with an mbuf chain. 259 */ 260 int 261 lca_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 262 bus_dma_tag_t t; 263 bus_dmamap_t map; 264 struct mbuf *m; 265 int flags; 266 { 267 int error; 268 269 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 270 if (error == 0) 271 LCA_TLB_INVALIDATE(); 272 273 return (error); 274 } 275 276 /* 277 * Load an LCA SGMAP-mapped DMA map with a uio. 278 */ 279 int 280 lca_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 281 bus_dma_tag_t t; 282 bus_dmamap_t map; 283 struct uio *uio; 284 int flags; 285 { 286 int error; 287 288 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 289 if (error == 0) 290 LCA_TLB_INVALIDATE(); 291 292 return (error); 293 } 294 295 /* 296 * Load an LCA SGMAP-mapped DMA map with raw memory. 297 */ 298 int 299 lca_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 300 bus_dma_tag_t t; 301 bus_dmamap_t map; 302 bus_dma_segment_t *segs; 303 int nsegs; 304 bus_size_t size; 305 int flags; 306 { 307 int error; 308 309 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 310 t->_sgmap); 311 if (error == 0) 312 LCA_TLB_INVALIDATE(); 313 314 return (error); 315 } 316 317 /* 318 * Unload an LCA DMA map. 319 */ 320 void 321 lca_bus_dmamap_unload_sgmap(t, map) 322 bus_dma_tag_t t; 323 bus_dmamap_t map; 324 { 325 326 /* 327 * Invalidate any SGMAP page table entries used by this 328 * mapping. 329 */ 330 pci_sgmap_pte64_unload(t, map, t->_sgmap); 331 LCA_TLB_INVALIDATE(); 332 333 /* 334 * Do the generic bits of the unload. 335 */ 336 _bus_dmamap_unload(t, map); 337 } 338
Indexes created Tue Sep 30 06:09:59 GMT 2025