1 /* $NetBSD: lca_dma.c,v 1.28 2023/08/01 21:26:27 andvar 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 1.28 2023/08/01 21:26:27 andvar Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/device.h> 41 42 #define _ALPHA_BUS_DMA_PRIVATE 43 #include <sys/bus.h> 44 45 #include <dev/pci/pcireg.h> 46 #include <dev/pci/pcivar.h> 47 #include <alpha/pci/lcareg.h> 48 #include <alpha/pci/lcavar.h> 49 50 static bus_dma_tag_t lca_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 51 52 static int lca_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 53 bus_size_t, struct proc *, int); 54 55 static int lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 56 struct mbuf *, int); 57 58 static int lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 59 struct uio *, int); 60 61 static int lca_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 62 bus_dma_segment_t *, int, bus_size_t, int); 63 64 static void lca_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 65 66 /* 67 * Direct-mapped window: 1G at 1G 68 */ 69 #define LCA_DIRECT_MAPPED_BASE (1*1024*1024*1024) 70 #define LCA_DIRECT_MAPPED_SIZE (1*1024*1024*1024) 71 72 /* 73 * SGMAP window: 8M at 8M 74 */ 75 #define LCA_SGMAP_MAPPED_BASE (8*1024*1024) 76 #define LCA_SGMAP_MAPPED_SIZE (8*1024*1024) 77 78 /* 79 * The LCA doesn't have a DMA prefetch threshold. However, it is known 80 * to lose if we don't allocate a spill page. So initialize it to 256. 81 */ 82 #define LCA_SGMAP_PFTHRESH 256 83 84 /* 85 * Macro to flush LCA scatter/gather TLB. 86 */ 87 #define LCA_TLB_INVALIDATE() \ 88 do { \ 89 alpha_mb(); \ 90 REGVAL64(LCA_IOC_TBIA) = 0; \ 91 alpha_mb(); \ 92 } while (0) 93 94 void 95 lca_dma_init(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->_pfthresh = LCA_SGMAP_PFTHRESH; 136 t->_get_tag = lca_dma_get_tag; 137 t->_dmamap_create = alpha_sgmap_dmamap_create; 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(uint64_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 } 189 190 /* 191 * Return the bus dma tag to be used for the specified bus type. 192 * INTERNAL USE ONLY! 193 */ 194 static bus_dma_tag_t 195 lca_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 196 { 197 struct lca_config *lcp = t->_cookie; 198 199 switch (bustype) { 200 case ALPHA_BUS_PCI: 201 case ALPHA_BUS_EISA: 202 /* 203 * Systems with an LCA can only support 1G 204 * of memory, so we use the direct-mapped window 205 * on busses that have 32-bit DMA. 206 */ 207 return (&lcp->lc_dmat_direct); 208 209 case ALPHA_BUS_ISA: 210 /* 211 * ISA doesn't have enough address bits to use 212 * the direct-mapped DMA window, so we must use 213 * SGMAPs. 214 */ 215 return (&lcp->lc_dmat_sgmap); 216 217 default: 218 panic("lca_dma_get_tag: shouldn't be here, really..."); 219 } 220 } 221 222 /* 223 * Load an LCA SGMAP-mapped DMA map with a linear buffer. 224 */ 225 static int 226 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) 227 { 228 int error; 229 230 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 231 t->_sgmap); 232 if (error == 0) 233 LCA_TLB_INVALIDATE(); 234 235 return (error); 236 } 237 238 /* 239 * Load an LCA SGMAP-mapped DMA map with an mbuf chain. 240 */ 241 static int 242 lca_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 243 { 244 int error; 245 246 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, 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 a uio. 255 */ 256 static int 257 lca_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 258 { 259 int error; 260 261 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 262 if (error == 0) 263 LCA_TLB_INVALIDATE(); 264 265 return (error); 266 } 267 268 /* 269 * Load an LCA SGMAP-mapped DMA map with raw memory. 270 */ 271 static int 272 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) 273 { 274 int error; 275 276 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 277 t->_sgmap); 278 if (error == 0) 279 LCA_TLB_INVALIDATE(); 280 281 return (error); 282 } 283 284 /* 285 * Unload an LCA DMA map. 286 */ 287 static void 288 lca_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 289 { 290 291 /* 292 * Invalidate any SGMAP page table entries used by this 293 * mapping. 294 */ 295 pci_sgmap_pte64_unload(t, map, t->_sgmap); 296 LCA_TLB_INVALIDATE(); 297 298 /* 299 * Do the generic bits of the unload. 300 */ 301 _bus_dmamap_unload_common(t, map); 302 } 303
Indexes created Sat Sep 20 22:09:52 GMT 2025