lca_dma.c revision 1.26
1 /* $NetBSD: lca_dma.c,v 1.26 2021/05/05 02:15:18 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 * 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 1.26 2021/05/05 02:15:18 thorpej 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 #define _ALPHA_BUS_DMA_PRIVATE 44 #include <sys/bus.h> 45 46 #include <dev/pci/pcireg.h> 47 #include <dev/pci/pcivar.h> 48 #include <alpha/pci/lcareg.h> 49 #include <alpha/pci/lcavar.h> 50 51 static bus_dma_tag_t lca_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 52 53 static int lca_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 54 bus_size_t, struct proc *, int); 55 56 static int lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 57 struct mbuf *, int); 58 59 static int lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 60 struct uio *, int); 61 62 static int lca_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 63 bus_dma_segment_t *, int, bus_size_t, int); 64 65 static void lca_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 66 67 /* 68 * Direct-mapped window: 1G at 1G 69 */ 70 #define LCA_DIRECT_MAPPED_BASE (1*1024*1024*1024) 71 #define LCA_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 72 73 /* 74 * SGMAP window: 8M at 8M 75 */ 76 #define LCA_SGMAP_MAPPED_BASE (8*1024*1024) 77 #define LCA_SGMAP_MAPPED_SIZE (8*1024*1024) 78 79 /* 80 * The LCA doesn't have a DMA prefetch threshold. However, it is known 81 * to lose if we don't allocate a spill page. So initialize it to 256. 82 */ 83 #define LCA_SGMAP_PFTHRESH 256 84 85 /* 86 * Macro to flush LCA scatter/gather TLB. 87 */ 88 #define LCA_TLB_INVALIDATE() \ 89 do { \ 90 alpha_mb(); \ 91 REGVAL64(LCA_IOC_TBIA) = 0; \ 92 alpha_mb(); \ 93 } while (0) 94 95 void 96 lca_dma_init(struct lca_config *lcp) 97 { 98 bus_dma_tag_t t; 99 100 /* 101 * Initialize the DMA tag used for direct-mapped DMA. 102 */ 103 t = &lcp->lc_dmat_direct; 104 t->_cookie = lcp; 105 t->_wbase = LCA_DIRECT_MAPPED_BASE; 106 t->_wsize = LCA_DIRECT_MAPPED_SIZE; 107 t->_next_window = NULL; 108 t->_boundary = 0; 109 t->_sgmap = NULL; 110 t->_get_tag = lca_dma_get_tag; 111 t->_dmamap_create = _bus_dmamap_create; 112 t->_dmamap_destroy = _bus_dmamap_destroy; 113 t->_dmamap_load = _bus_dmamap_load_direct; 114 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 115 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 116 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 117 t->_dmamap_unload = _bus_dmamap_unload; 118 t->_dmamap_sync = _bus_dmamap_sync; 119 120 t->_dmamem_alloc = _bus_dmamem_alloc; 121 t->_dmamem_free = _bus_dmamem_free; 122 t->_dmamem_map = _bus_dmamem_map; 123 t->_dmamem_unmap = _bus_dmamem_unmap; 124 t->_dmamem_mmap = _bus_dmamem_mmap; 125 126 /* 127 * Initialize the DMA tag used for sgmap-mapped DMA. 128 */ 129 t = &lcp->lc_dmat_sgmap; 130 t->_cookie = lcp; 131 t->_wbase = LCA_SGMAP_MAPPED_BASE; 132 t->_wsize = LCA_SGMAP_MAPPED_SIZE; 133 t->_next_window = NULL; 134 t->_boundary = 0; 135 t->_sgmap = &lcp->lc_sgmap; 136 t->_pfthresh = LCA_SGMAP_PFTHRESH; 137 t->_get_tag = lca_dma_get_tag; 138 t->_dmamap_create = alpha_sgmap_dmamap_create; 139 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 140 t->_dmamap_load = lca_bus_dmamap_load_sgmap; 141 t->_dmamap_load_mbuf = lca_bus_dmamap_load_mbuf_sgmap; 142 t->_dmamap_load_uio = lca_bus_dmamap_load_uio_sgmap; 143 t->_dmamap_load_raw = lca_bus_dmamap_load_raw_sgmap; 144 t->_dmamap_unload = lca_bus_dmamap_unload_sgmap; 145 t->_dmamap_sync = _bus_dmamap_sync; 146 147 t->_dmamem_alloc = _bus_dmamem_alloc; 148 t->_dmamem_free = _bus_dmamem_free; 149 t->_dmamem_map = _bus_dmamem_map; 150 t->_dmamem_unmap = _bus_dmamem_unmap; 151 t->_dmamem_mmap = _bus_dmamem_mmap; 152 153 /* Initialize window 1 as a direct-mapped window. */ 154 REGVAL64(LCA_IOC_W_BASE1) = LCA_DIRECT_MAPPED_BASE | IOC_W_BASE_WEN; 155 REGVAL64(LCA_IOC_W_MASK1) = IOC_W_MASK_1G; 156 alpha_mb(); 157 158 /* Disable window 0 while we set it up. */ 159 REGVAL64(LCA_IOC_W_BASE0) = 0; 160 alpha_mb(); 161 162 /* 163 * Initialize the SGMAP. 164 */ 165 alpha_sgmap_init(t, &lcp->lc_sgmap, "lca_sgmap", 166 LCA_SGMAP_MAPPED_BASE, 0, LCA_SGMAP_MAPPED_SIZE, 167 sizeof(uint64_t), NULL, 0); 168 169 /* 170 * Set up window 0 as an 8MB SGMAP-mapped window 171 * starting at 8MB. 172 */ 173 REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_MAPPED_BASE | 174 IOC_W_BASE_SG | IOC_W_BASE_WEN; 175 REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M; 176 alpha_mb(); 177 178 if ((lcp->lc_sgmap.aps_ptpa & IOC_W_T_BASE) != 179 lcp->lc_sgmap.aps_ptpa) 180 panic("lca_dma_init: bad page table address"); 181 REGVAL64(LCA_IOC_W_T_BASE0) = lcp->lc_sgmap.aps_ptpa; 182 alpha_mb(); 183 184 /* Enble the scatter/gather TLB. */ 185 REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN; 186 alpha_mb(); 187 188 LCA_TLB_INVALIDATE(); 189 } 190 191 /* 192 * Return the bus dma tag to be used for the specified bus type. 193 * INTERNAL USE ONLY! 194 */ 195 static bus_dma_tag_t 196 lca_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 197 { 198 struct lca_config *lcp = t->_cookie; 199 200 switch (bustype) { 201 case ALPHA_BUS_PCI: 202 case ALPHA_BUS_EISA: 203 /* 204 * Systems with an LCA can only support 1G 205 * of memory, so we use the direct-mapped window 206 * on busses that have 32-bit DMA. 207 */ 208 return (&lcp->lc_dmat_direct); 209 210 case ALPHA_BUS_ISA: 211 /* 212 * ISA doesn't have enough address bits to use 213 * the direct-mapped DMA window, so we must use 214 * SGMAPs. 215 */ 216 return (&lcp->lc_dmat_sgmap); 217 218 default: 219 panic("lca_dma_get_tag: shouldn't be here, really..."); 220 } 221 } 222 223 /* 224 * Load an LCA SGMAP-mapped DMA map with a linear buffer. 225 */ 226 static int 227 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) 228 { 229 int error; 230 231 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 232 t->_sgmap); 233 if (error == 0) 234 LCA_TLB_INVALIDATE(); 235 236 return (error); 237 } 238 239 /* 240 * Load an LCA SGMAP-mapped DMA map with an mbuf chain. 241 */ 242 static int 243 lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 244 { 245 int error; 246 247 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 248 if (error == 0) 249 LCA_TLB_INVALIDATE(); 250 251 return (error); 252 } 253 254 /* 255 * Load an LCA SGMAP-mapped DMA map with a uio. 256 */ 257 static int 258 lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 259 { 260 int error; 261 262 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 263 if (error == 0) 264 LCA_TLB_INVALIDATE(); 265 266 return (error); 267 } 268 269 /* 270 * Load an LCA SGMAP-mapped DMA map with raw memory. 271 */ 272 static int 273 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) 274 { 275 int error; 276 277 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 278 t->_sgmap); 279 if (error == 0) 280 LCA_TLB_INVALIDATE(); 281 282 return (error); 283 } 284 285 /* 286 * Unload an LCA DMA map. 287 */ 288 static void 289 lca_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 290 { 291 292 /* 293 * Invalidate any SGMAP page table entries used by this 294 * mapping. 295 */ 296 pci_sgmap_pte64_unload(t, map, t->_sgmap); 297 LCA_TLB_INVALIDATE(); 298 299 /* 300 * Do the generic bits of the unload. 301 */ 302 _bus_dmamap_unload_common(t, map); 303 } 304
Indexes created Mon Sep 29 21:09:56 GMT 2025