lca_dma.c revision 1.20
1 /* $NetBSD: lca_dma.c,v 1.20 2009/03/14 15:35:59 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 1.20 2009/03/14 15:35:59 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(struct lca_config *lcp) 99 { 100 bus_dma_tag_t t; 101 102 /* 103 * Initialize the DMA tag used for direct-mapped DMA. 104 */ 105 t = &lcp->lc_dmat_direct; 106 t->_cookie = lcp; 107 t->_wbase = LCA_DIRECT_MAPPED_BASE; 108 t->_wsize = LCA_DIRECT_MAPPED_SIZE; 109 t->_next_window = NULL; 110 t->_boundary = 0; 111 t->_sgmap = NULL; 112 t->_get_tag = lca_dma_get_tag; 113 t->_dmamap_create = _bus_dmamap_create; 114 t->_dmamap_destroy = _bus_dmamap_destroy; 115 t->_dmamap_load = _bus_dmamap_load_direct; 116 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 117 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 118 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 119 t->_dmamap_unload = _bus_dmamap_unload; 120 t->_dmamap_sync = _bus_dmamap_sync; 121 122 t->_dmamem_alloc = _bus_dmamem_alloc; 123 t->_dmamem_free = _bus_dmamem_free; 124 t->_dmamem_map = _bus_dmamem_map; 125 t->_dmamem_unmap = _bus_dmamem_unmap; 126 t->_dmamem_mmap = _bus_dmamem_mmap; 127 128 /* 129 * Initialize the DMA tag used for sgmap-mapped DMA. 130 */ 131 t = &lcp->lc_dmat_sgmap; 132 t->_cookie = lcp; 133 t->_wbase = LCA_SGMAP_MAPPED_BASE; 134 t->_wsize = LCA_SGMAP_MAPPED_SIZE; 135 t->_next_window = NULL; 136 t->_boundary = 0; 137 t->_sgmap = &lcp->lc_sgmap; 138 t->_pfthresh = LCA_SGMAP_PFTHRESH; 139 t->_get_tag = lca_dma_get_tag; 140 t->_dmamap_create = alpha_sgmap_dmamap_create; 141 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 142 t->_dmamap_load = lca_bus_dmamap_load_sgmap; 143 t->_dmamap_load_mbuf = lca_bus_dmamap_load_mbuf_sgmap; 144 t->_dmamap_load_uio = lca_bus_dmamap_load_uio_sgmap; 145 t->_dmamap_load_raw = lca_bus_dmamap_load_raw_sgmap; 146 t->_dmamap_unload = lca_bus_dmamap_unload_sgmap; 147 t->_dmamap_sync = _bus_dmamap_sync; 148 149 t->_dmamem_alloc = _bus_dmamem_alloc; 150 t->_dmamem_free = _bus_dmamem_free; 151 t->_dmamem_map = _bus_dmamem_map; 152 t->_dmamem_unmap = _bus_dmamem_unmap; 153 t->_dmamem_mmap = _bus_dmamem_mmap; 154 155 /* Initialize window 1 as a direct-mapped window. */ 156 REGVAL64(LCA_IOC_W_BASE1) = LCA_DIRECT_MAPPED_BASE | IOC_W_BASE_WEN; 157 REGVAL64(LCA_IOC_W_MASK1) = IOC_W_MASK_1G; 158 alpha_mb(); 159 160 /* Disable window 0 while we set it up. */ 161 REGVAL64(LCA_IOC_W_BASE0) = 0; 162 alpha_mb(); 163 164 /* 165 * Initialize the SGMAP. 166 */ 167 alpha_sgmap_init(t, &lcp->lc_sgmap, "lca_sgmap", 168 LCA_SGMAP_MAPPED_BASE, 0, LCA_SGMAP_MAPPED_SIZE, 169 sizeof(u_int64_t), NULL, 0); 170 171 /* 172 * Set up window 0 as an 8MB SGMAP-mapped window 173 * starting at 8MB. 174 */ 175 REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_MAPPED_BASE | 176 IOC_W_BASE_SG | IOC_W_BASE_WEN; 177 REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M; 178 alpha_mb(); 179 180 if ((lcp->lc_sgmap.aps_ptpa & IOC_W_T_BASE) != 181 lcp->lc_sgmap.aps_ptpa) 182 panic("lca_dma_init: bad page table address"); 183 REGVAL64(LCA_IOC_W_T_BASE0) = lcp->lc_sgmap.aps_ptpa; 184 alpha_mb(); 185 186 /* Enble the scatter/gather TLB. */ 187 REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN; 188 alpha_mb(); 189 190 LCA_TLB_INVALIDATE(); 191 192 /* XXX XXX BEGIN XXX XXX */ 193 { /* XXX */ 194 extern paddr_t alpha_XXX_dmamap_or; /* XXX */ 195 alpha_XXX_dmamap_or = LCA_DIRECT_MAPPED_BASE; /* XXX */ 196 } /* XXX */ 197 /* XXX XXX END XXX XXX */ 198 } 199 200 /* 201 * Return the bus dma tag to be used for the specified bus type. 202 * INTERNAL USE ONLY! 203 */ 204 bus_dma_tag_t 205 lca_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 206 { 207 struct lca_config *lcp = t->_cookie; 208 209 switch (bustype) { 210 case ALPHA_BUS_PCI: 211 case ALPHA_BUS_EISA: 212 /* 213 * Systems with an LCA can only support 1G 214 * of memory, so we use the direct-mapped window 215 * on busses that have 32-bit DMA. 216 */ 217 return (&lcp->lc_dmat_direct); 218 219 case ALPHA_BUS_ISA: 220 /* 221 * ISA doesn't have enough address bits to use 222 * the direct-mapped DMA window, so we must use 223 * SGMAPs. 224 */ 225 return (&lcp->lc_dmat_sgmap); 226 227 default: 228 panic("lca_dma_get_tag: shouldn't be here, really..."); 229 } 230 } 231 232 /* 233 * Load an LCA SGMAP-mapped DMA map with a linear buffer. 234 */ 235 int 236 lca_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) 237 { 238 int error; 239 240 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 241 t->_sgmap); 242 if (error == 0) 243 LCA_TLB_INVALIDATE(); 244 245 return (error); 246 } 247 248 /* 249 * Load an LCA SGMAP-mapped DMA map with an mbuf chain. 250 */ 251 int 252 lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 253 { 254 int error; 255 256 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 257 if (error == 0) 258 LCA_TLB_INVALIDATE(); 259 260 return (error); 261 } 262 263 /* 264 * Load an LCA SGMAP-mapped DMA map with a uio. 265 */ 266 int 267 lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 268 { 269 int error; 270 271 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 272 if (error == 0) 273 LCA_TLB_INVALIDATE(); 274 275 return (error); 276 } 277 278 /* 279 * Load an LCA SGMAP-mapped DMA map with raw memory. 280 */ 281 int 282 lca_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 283 { 284 int error; 285 286 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 287 t->_sgmap); 288 if (error == 0) 289 LCA_TLB_INVALIDATE(); 290 291 return (error); 292 } 293 294 /* 295 * Unload an LCA DMA map. 296 */ 297 void 298 lca_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 299 { 300 301 /* 302 * Invalidate any SGMAP page table entries used by this 303 * mapping. 304 */ 305 pci_sgmap_pte64_unload(t, map, t->_sgmap); 306 LCA_TLB_INVALIDATE(); 307 308 /* 309 * Do the generic bits of the unload. 310 */ 311 _bus_dmamap_unload(t, map); 312 } 313
Indexes created Tue Sep 30 11:09:46 GMT 2025