1 /* $NetBSD: ttwoga_dma.c,v 1.11 2021/05/08 00:08:43 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 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. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 33 34 __KERNEL_RCSID(0, "$NetBSD: ttwoga_dma.c,v 1.11 2021/05/08 00:08:43 thorpej Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/device.h> 40 41 #define _ALPHA_BUS_DMA_PRIVATE 42 #include <sys/bus.h> 43 44 #include <dev/pci/pcireg.h> 45 #include <dev/pci/pcivar.h> 46 47 #include <alpha/pci/ttwogareg.h> 48 #include <alpha/pci/ttwogavar.h> 49 50 static bus_dma_tag_t ttwoga_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 51 52 static int ttwoga_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, 53 void *, bus_size_t, struct proc *, int); 54 55 static int ttwoga_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 56 struct mbuf *, int); 57 58 static int ttwoga_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 59 struct uio *, int); 60 61 static int ttwoga_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 ttwoga_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 65 66 /* 67 * Direct-mapped window: 1G at 1G 68 */ 69 #define TTWOGA_DIRECT_MAPPED_BASE (1UL*1024UL*1024UL*1024UL) 70 #define TTWOGA_DIRECT_MAPPED_SIZE (1UL*1024UL*1024UL*1024UL) 71 72 /* 73 * SGMAP window: 8M at 8M 74 */ 75 #define TTWOGA_SGMAP_MAPPED_BASE (8UL*1024UL*1024UL) 76 #define TTWOGA_SGMAP_MAPPED_SIZE (8UL*1024UL*1024UL) 77 78 /* T2 has a 256-byte out-bound DMA prefetch threshold. */ 79 #define TTWOGA_SGMAP_PFTHRESH 256 80 81 /* 82 * Macro to flush the T2 Gate Array scatter/gather TLB. 83 */ 84 #define TTWOGA_TLB_INVALIDATE(tcp) \ 85 do { \ 86 uint64_t temp; \ 87 \ 88 alpha_mb(); \ 89 temp = T2GA((tcp), T2_IOCSR); \ 90 T2GA((tcp), T2_IOCSR) = temp | IOCSR_FTLB; \ 91 alpha_mb(); \ 92 alpha_mb(); /* MAGIC */ \ 93 T2GA((tcp), T2_IOCSR) = temp; \ 94 alpha_mb(); \ 95 alpha_mb(); /* MAGIC */ \ 96 } while (0) 97 98 void 99 ttwoga_dma_init(struct ttwoga_config *tcp) 100 { 101 bus_dma_tag_t t; 102 103 /* 104 * Initialize the DMA tag used for direct-mapped DMA. 105 */ 106 t = &tcp->tc_dmat_direct; 107 t->_cookie = tcp; 108 t->_wbase = TTWOGA_DIRECT_MAPPED_BASE; 109 t->_wsize = TTWOGA_DIRECT_MAPPED_SIZE; 110 t->_next_window = NULL; 111 t->_boundary = 0; 112 t->_sgmap = NULL; 113 t->_get_tag = ttwoga_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 = &tcp->tc_dmat_sgmap; 133 t->_cookie = tcp; 134 t->_wbase = TTWOGA_SGMAP_MAPPED_BASE; 135 t->_wsize = TTWOGA_SGMAP_MAPPED_SIZE; 136 t->_next_window = NULL; 137 t->_boundary = 0; 138 t->_sgmap = &tcp->tc_sgmap; 139 t->_pfthresh = TTWOGA_SGMAP_PFTHRESH; 140 t->_get_tag = ttwoga_dma_get_tag; 141 t->_dmamap_create = alpha_sgmap_dmamap_create; 142 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 143 t->_dmamap_load = ttwoga_bus_dmamap_load_sgmap; 144 t->_dmamap_load_mbuf = ttwoga_bus_dmamap_load_mbuf_sgmap; 145 t->_dmamap_load_uio = ttwoga_bus_dmamap_load_uio_sgmap; 146 t->_dmamap_load_raw = ttwoga_bus_dmamap_load_raw_sgmap; 147 t->_dmamap_unload = ttwoga_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 /* 157 * Disable the SGMAP TLB, and flush it. We reenable it if 158 * we have a Sable or a Gamma with T3 or T4; Gamma with T2 159 * has a TLB bug apparently severe enough to require disabling 160 * it. 161 */ 162 alpha_mb(); 163 T2GA(tcp, T2_IOCSR) &= ~IOCSR_ETLB; 164 alpha_mb(); 165 alpha_mb(); /* MAGIC */ 166 167 TTWOGA_TLB_INVALIDATE(tcp); 168 169 /* 170 * XXX We might want to make sure our DMA windows don't 171 * XXX overlap with PCI memory space! 172 */ 173 174 /* 175 * Set up window 1 as a 1G direct-mapped window 176 * starting at 1G. 177 */ 178 T2GA(tcp, T2_WBASE1) = 0; 179 alpha_mb(); 180 181 T2GA(tcp, T2_WMASK1) = (TTWOGA_DIRECT_MAPPED_SIZE - 1) & WMASKx_PWM; 182 alpha_mb(); 183 184 T2GA(tcp, T2_TBASE1) = 0; 185 alpha_mb(); 186 187 T2GA(tcp, T2_WBASE1) = TTWOGA_DIRECT_MAPPED_BASE | 188 ((TTWOGA_DIRECT_MAPPED_BASE + (TTWOGA_DIRECT_MAPPED_SIZE - 1)) >> 189 WBASEx_PWxA_SHIFT) | WBASEx_PWE; 190 alpha_mb(); 191 192 /* 193 * Initialize the SGMAP. 194 */ 195 alpha_sgmap_init(t, &tcp->tc_sgmap, "ttwoga_sgmap", 196 TTWOGA_SGMAP_MAPPED_BASE, 0, TTWOGA_SGMAP_MAPPED_SIZE, 197 sizeof(uint64_t), NULL, 0); 198 199 /* 200 * Set up window 2 as an 8MB SGMAP-mapped window 201 * starting at 8MB. 202 */ 203 #ifdef DIAGNOSTIC 204 if ((TTWOGA_SGMAP_MAPPED_BASE & WBASEx_PWSA) != 205 TTWOGA_SGMAP_MAPPED_BASE) 206 panic("ttwoga_dma_init: SGMAP base inconsistency"); 207 #endif 208 T2GA(tcp, T2_WBASE2) = 0; 209 alpha_mb(); 210 211 T2GA(tcp, T2_WMASK2) = (TTWOGA_SGMAP_MAPPED_SIZE - 1) & WMASKx_PWM; 212 alpha_mb(); 213 214 T2GA(tcp, T2_TBASE2) = tcp->tc_sgmap.aps_ptpa >> 1; 215 alpha_mb(); 216 217 T2GA(tcp, T2_WBASE2) = TTWOGA_SGMAP_MAPPED_BASE | 218 ((TTWOGA_SGMAP_MAPPED_BASE + (TTWOGA_SGMAP_MAPPED_SIZE - 1)) >> 219 WBASEx_PWxA_SHIFT) | WBASEx_SGE | WBASEx_PWE; 220 alpha_mb(); 221 222 /* 223 * Enable SGMAP TLB on Sable or Gamma with T3 or T4; see above. 224 */ 225 if (alpha_implver() == ALPHA_IMPLVER_EV4 || 226 tcp->tc_rev >= TRN_T3) { 227 alpha_mb(); 228 T2GA(tcp, T2_IOCSR) |= IOCSR_ETLB; 229 alpha_mb(); 230 alpha_mb(); /* MAGIC */ 231 tcp->tc_use_tlb = 1; 232 } 233 } 234 235 /* 236 * Return the bus dma tag to be used for the specified bus type. 237 * INTERNAL USE ONLY! 238 */ 239 static bus_dma_tag_t 240 ttwoga_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 241 { 242 struct ttwoga_config *tcp = t->_cookie; 243 244 switch (bustype) { 245 case ALPHA_BUS_PCI: 246 case ALPHA_BUS_EISA: 247 /* 248 * Systems with a T2 Gate Array can have 2G 249 * of memory, but we only get a direct-mapped 250 * window of 1G! 251 * 252 * XXX FIX THIS SOMEDAY! 253 */ 254 return (&tcp->tc_dmat_direct); 255 256 case ALPHA_BUS_ISA: 257 /* 258 * ISA doesn't have enough address bits to use 259 * the direct-mapped DMA window, so we must use 260 * SGMAPs. 261 */ 262 return (&tcp->tc_dmat_sgmap); 263 264 default: 265 panic("ttwoga_dma_get_tag: shouldn't be here, really..."); 266 } 267 } 268 269 /* 270 * Load a T2 SGMAP-mapped DMA map with a liner buffer. 271 */ 272 static int 273 ttwoga_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 274 bus_size_t buflen, struct proc *p, int flags) 275 { 276 struct ttwoga_config *tcp = t->_cookie; 277 int error; 278 279 error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags, 280 t->_sgmap); 281 if (error == 0 && tcp->tc_use_tlb) 282 TTWOGA_TLB_INVALIDATE(tcp); 283 284 return (error); 285 } 286 287 /* 288 * Load a T2 SGMAP-mapped DMA map with an mbuf chain. 289 */ 290 static int 291 ttwoga_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 292 struct mbuf *m, int flags) 293 { 294 struct ttwoga_config *tcp = t->_cookie; 295 int error; 296 297 error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap); 298 if (error == 0 && tcp->tc_use_tlb) 299 TTWOGA_TLB_INVALIDATE(tcp); 300 301 return (error); 302 } 303 304 /* 305 * Load a T2 SGMAP-mapped DMA map with a uio. 306 */ 307 static int 308 ttwoga_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 309 struct uio *uio, int flags) 310 { 311 struct ttwoga_config *tcp = t->_cookie; 312 int error; 313 314 error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap); 315 if (error == 0 && tcp->tc_use_tlb) 316 TTWOGA_TLB_INVALIDATE(tcp); 317 318 return (error); 319 } 320 321 /* 322 * Load a T2 SGMAP-mapped DMA map with raw memory. 323 */ 324 static int 325 ttwoga_bus_dmamap_load_raw_sgmap(bus_dma_tag_t t, bus_dmamap_t map, 326 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 327 { 328 struct ttwoga_config *tcp = t->_cookie; 329 int error; 330 331 error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags, 332 t->_sgmap); 333 if (error == 0 && tcp->tc_use_tlb) 334 TTWOGA_TLB_INVALIDATE(tcp); 335 336 return (error); 337 } 338 339 /* 340 * Unload an T2 DMA map. 341 */ 342 static void 343 ttwoga_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 344 { 345 struct ttwoga_config *tcp = t->_cookie; 346 347 /* 348 * Invalidate any SGMAP page table entries used by this 349 * mapping. 350 */ 351 pci_sgmap_pte64_unload(t, map, t->_sgmap); 352 if (tcp->tc_use_tlb) 353 TTWOGA_TLB_INVALIDATE(tcp); 354 355 /* 356 * Do the generic bits of the unload. 357 */ 358 _bus_dmamap_unload_common(t, map); 359 } 360
Indexes created Mon Sep 29 18:09:42 GMT 2025