1 /* $OpenBSD: lca_dma.c,v 1.10 2013/03/08 18:26:54 miod Exp $ */ 2 /* $NetBSD: lca_dma.c,v 1.13 2000/06/29 08:58:47 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/lcareg.h> 53 #include <alpha/pci/lcavar.h> 54 55 bus_dma_tag_t lca_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 56 57 int lca_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 58 bus_size_t, struct proc *, int); 59 60 int lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 61 struct mbuf *, int); 62 63 int lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 64 struct uio *, int); 65 66 int lca_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 lca_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 70 71 /* 72 * Direct-mapped window: 1G at 1G 73 */ 74 #define LCA_DIRECT_MAPPED_BASE (1*1024*1024*1024) 75 #define LCA_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 76 77 /* 78 * SGMAP window: 8M at 8M 79 */ 80 #define LCA_SGMAP_MAPPED_BASE (8*1024*1024) 81 #define LCA_SGMAP_MAPPED_SIZE (8*1024*1024) 82 83 /* 84 * Macro to flush LCA scatter/gather TLB. 85 */ 86 #define LCA_TLB_INVALIDATE() \ 87 do { \ 88 alpha_mb(); \ 89 REGVAL64(LCA_IOC_TBIA) = 0; \ 90 alpha_mb(); \ 91 } while (0) 92 93 void 94 lca_dma_init(lcp) 95 struct lca_config *lcp; 96 { 97 bus_dma_tag_t t; 98 99 /* 100 * Initialize the DMA tag used for direct-mapped DMA. 101 */ 102 t = &lcp->lc_dmat_direct; 103 t->_cookie = lcp; 104 t->_wbase = LCA_DIRECT_MAPPED_BASE; 105 t->_wsize = LCA_DIRECT_MAPPED_SIZE; 106 t->_next_window = NULL; 107 t->_boundary = 0; 108 t->_sgmap = NULL; 109 t->_get_tag = lca_dma_get_tag; 110 t->_dmamap_create = _bus_dmamap_create; 111 t->_dmamap_destroy = _bus_dmamap_destroy; 112 t->_dmamap_load = _bus_dmamap_load_direct; 113 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 114 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 115 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 116 t->_dmamap_unload = _bus_dmamap_unload; 117 t->_dmamap_sync = _bus_dmamap_sync; 118 119 t->_dmamem_alloc = _bus_dmamem_alloc; 120 t->_dmamem_free = _bus_dmamem_free; 121 t->_dmamem_map = _bus_dmamem_map; 122 t->_dmamem_unmap = _bus_dmamem_unmap; 123 t->_dmamem_mmap = _bus_dmamem_mmap; 124 125 /* 126 * Initialize the DMA tag used for sgmap-mapped DMA. 127 */ 128 t = &lcp->lc_dmat_sgmap; 129 t->_cookie = lcp; 130 t->_wbase = LCA_SGMAP_MAPPED_BASE; 131 t->_wsize = LCA_SGMAP_MAPPED_SIZE; 132 t->_next_window = NULL; 133 t->_boundary = 0; 134 t->_sgmap = &lcp->lc_sgmap; 135 t->_get_tag = lca_dma_get_tag; 136 t->_dmamap_create = alpha_sgmap_dmamap_create; 137 138 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 139 t->_dmamap_load = lca_bus_dmamap_load_sgmap; 140 t->_dmamap_load_mbuf = lca_bus_dmamap_load_mbuf_sgmap; 141 t->_dmamap_load_uio = lca_bus_dmamap_load_uio_sgmap; 142 t->_dmamap_load_raw = lca_bus_dmamap_load_raw_sgmap; 143 t->_dmamap_unload = lca_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 /* Initialize window 1 as a direct-mapped window. */ 153 REGVAL64(LCA_IOC_W_BASE1) = LCA_DIRECT_MAPPED_BASE | IOC_W_BASE_WEN; 154 REGVAL64(LCA_IOC_W_MASK1) = IOC_W_MASK_1G; 155 alpha_mb(); 156 157 /* Disable window 0 while we set it up. */ 158 REGVAL64(LCA_IOC_W_BASE0) = 0; 159 alpha_mb(); 160 161 /* 162 * Initialize the SGMAP. 163 */ 164 alpha_sgmap_init(t, &lcp->lc_sgmap, "lca_sgmap", 165 LCA_SGMAP_MAPPED_BASE, 0, LCA_SGMAP_MAPPED_SIZE, 166 sizeof(u_int64_t), NULL, 0); 167 168 /* 169 * Set up window 0 as an 8MB SGMAP-mapped window 170 * starting at 8MB. 171 */ 172 REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_MAPPED_BASE | 173 IOC_W_BASE_SG | IOC_W_BASE_WEN; 174 REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M; 175 alpha_mb(); 176 177 if ((lcp->lc_sgmap.aps_ptpa & IOC_W_T_BASE) != 178 lcp->lc_sgmap.aps_ptpa) 179 panic("lca_dma_init: bad page table address"); 180 REGVAL64(LCA_IOC_W_T_BASE0) = lcp->lc_sgmap.aps_ptpa; 181 alpha_mb(); 182 183 /* Enable the scatter/gather TLB. */ 184 REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN; 185 alpha_mb(); 186 187 LCA_TLB_INVALIDATE(); 188 189 /* XXX XXX BEGIN XXX XXX */ 190 { /* XXX */ 191 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 192 alpha_XXX_dmamap_or = LCA_DIRECT_MAPPED_BASE; /* XXX */ 193 } /* XXX */ 194 /* XXX XXX END XXX XXX */ 195 } 196 197 /* 198 * Return the bus dma tag to be used for the specified bus type. 199 * INTERNAL USE ONLY! 200 */ 201 bus_dma_tag_t 202 lca_dma_get_tag(t, bustype) 203 bus_dma_tag_t t; 204 alpha_bus_t bustype; 205 { 206 struct lca_config *lcp = t->_cookie; 207 208 switch (bustype) { 209 case ALPHA_BUS_PCI: 210 case ALPHA_BUS_EISA: 211 /* 212 * Systems with an LCA can only support 1G 213 * of memory, so we use the direct-mapped window 214 * on busses that have 32-bit DMA. 215 */ 216 return (&lcp->lc_dmat_direct); 217 218 case ALPHA_BUS_ISA: 219 /* 220 * ISA doesn't have enough address bits to use 221 * the direct-mapped DMA window, so we must use 222 * SGMAPs. 223 */ 224 return (&lcp->lc_dmat_sgmap); 225 226 default: 227 panic("lca_dma_get_tag: shouldn't be here, really..."); 228 } 229 } 230 231 /* 232 * Load an LCA SGMAP-mapped DMA map with a linear buffer. 233 */ 234 int 235 lca_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags) 236 bus_dma_tag_t t; 237 bus_dmamap_t map; 238 void *buf; 239 bus_size_t buflen; 240 struct proc *p; 241 int flags; 242 { 243 int error; 244 245 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 246 t->_sgmap); 247 if (error == 0) 248 LCA_TLB_INVALIDATE(); 249 250 return (error); 251 } 252 253 /* 254 * Load an LCA SGMAP-mapped DMA map with an mbuf chain. 255 */ 256 int 257 lca_bus_dmamap_load_mbuf_sgmap(t, map, m, flags) 258 bus_dma_tag_t t; 259 bus_dmamap_t map; 260 struct mbuf *m; 261 int flags; 262 { 263 int error; 264 265 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 266 if (error == 0) 267 LCA_TLB_INVALIDATE(); 268 269 return (error); 270 } 271 272 /* 273 * Load an LCA SGMAP-mapped DMA map with a uio. 274 */ 275 int 276 lca_bus_dmamap_load_uio_sgmap(t, map, uio, flags) 277 bus_dma_tag_t t; 278 bus_dmamap_t map; 279 struct uio *uio; 280 int flags; 281 { 282 int error; 283 284 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 285 if (error == 0) 286 LCA_TLB_INVALIDATE(); 287 288 return (error); 289 } 290 291 /* 292 * Load an LCA SGMAP-mapped DMA map with raw memory. 293 */ 294 int 295 lca_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags) 296 bus_dma_tag_t t; 297 bus_dmamap_t map; 298 bus_dma_segment_t *segs; 299 int nsegs; 300 bus_size_t size; 301 int flags; 302 { 303 int error; 304 305 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 306 t->_sgmap); 307 if (error == 0) 308 LCA_TLB_INVALIDATE(); 309 310 return (error); 311 } 312 313 /* 314 * Unload an LCA DMA map. 315 */ 316 void 317 lca_bus_dmamap_unload_sgmap(t, map) 318 bus_dma_tag_t t; 319 bus_dmamap_t map; 320 { 321 322 /* 323 * Invalidate any SGMAP page table entries used by this 324 * mapping. 325 */ 326 pci_sgmap_pte64_unload(t, map, t->_sgmap); 327 LCA_TLB_INVALIDATE(); 328 329 /* 330 * Do the generic bits of the unload. 331 */ 332 _bus_dmamap_unload(t, map); 333 } 334