1 /* $NetBSD: dwlpx_dma.c,v 1.30 2021/06/19 16:43:11 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: dwlpx_dma.c,v 1.30 2021/06/19 16:43:11 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/kmem.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/tlsb/tlsbreg.h> 49 #include <alpha/tlsb/kftxxvar.h> 50 #include <alpha/tlsb/kftxxreg.h> 51 #include <alpha/pci/dwlpxreg.h> 52 #include <alpha/pci/dwlpxvar.h> 53 54 static bus_dma_tag_t dwlpx_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 55 56 static int dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 57 bus_size_t, struct proc *, int); 58 59 static int dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 60 struct mbuf *, int); 61 62 static int dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 63 struct uio *, int); 64 65 static int dwlpx_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 66 bus_dma_segment_t *, int, bus_size_t, int); 67 68 static void dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 69 70 /* 71 * Direct-mapped window: 2G at 2G 72 */ 73 #define DWLPx_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) 74 #define DWLPx_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL) 75 76 /* 77 * SGMAP window A: 256M or 1G at 1G 78 */ 79 #define DWLPx_SG_MAPPED_BASE (1*1024*1024*1024) 80 #define DWLPx_SG_MAPPED_SIZE(x) ((x) * PAGE_SIZE) 81 82 /* DWLPx has a 256-byte out-bound DMA prefetch threshold. */ 83 #define DWLPx_SG_MAPPED_PFTHRESH 256 84 85 /* 86 * Set this to always use SGMAPs. 87 */ 88 #ifdef DWLPX_ALWAYS_USE_SGMAP 89 int dwlpx_always_use_sgmap = 1; 90 #else 91 int dwlpx_always_use_sgmap = 0; 92 #endif 93 94 void 95 dwlpx_dma_init(struct dwlpx_config *ccp) 96 { 97 char *exname; 98 bus_dma_tag_t t; 99 uint32_t *page_table; 100 int i, lim, wmask; 101 102 /* 103 * Determine size of Window C based on the amount of SGMAP 104 * page table SRAM available. 105 */ 106 if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) { 107 lim = 128 * 1024; 108 wmask = PCIA_WMASK_1G; 109 } else { 110 lim = 32 * 1024; 111 wmask = PCIA_WMASK_256M; 112 } 113 114 /* 115 * Initialize the DMA tag used for direct-mapped DMA. Chain 116 * this window to the SGMAP window, because we might have 117 * a lot of memory in the machine. 118 */ 119 t = &ccp->cc_dmat_direct; 120 t->_cookie = ccp; 121 t->_wbase = DWLPx_DIRECT_MAPPED_BASE; 122 t->_wsize = DWLPx_DIRECT_MAPPED_SIZE; 123 t->_next_window = &ccp->cc_dmat_sgmap; 124 t->_boundary = 0; 125 t->_sgmap = NULL; 126 t->_get_tag = dwlpx_dma_get_tag; 127 t->_dmamap_create = _bus_dmamap_create; 128 t->_dmamap_destroy = _bus_dmamap_destroy; 129 t->_dmamap_load = _bus_dmamap_load_direct; 130 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 131 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 132 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 133 t->_dmamap_unload = _bus_dmamap_unload; 134 t->_dmamap_sync = _bus_dmamap_sync; 135 136 t->_dmamem_alloc = _bus_dmamem_alloc; 137 t->_dmamem_free = _bus_dmamem_free; 138 t->_dmamem_map = _bus_dmamem_map; 139 t->_dmamem_unmap = _bus_dmamem_unmap; 140 t->_dmamem_mmap = _bus_dmamem_mmap; 141 142 /* 143 * Initialize the DMA tag used for sgmap-mapped DMA. 144 */ 145 t = &ccp->cc_dmat_sgmap; 146 t->_cookie = ccp; 147 t->_wbase = DWLPx_SG_MAPPED_BASE; 148 t->_wsize = DWLPx_SG_MAPPED_SIZE(lim); 149 t->_next_window = NULL; 150 t->_boundary = 0; 151 t->_sgmap = &ccp->cc_sgmap; 152 t->_pfthresh = DWLPx_SG_MAPPED_PFTHRESH; 153 t->_get_tag = dwlpx_dma_get_tag; 154 t->_dmamap_create = alpha_sgmap_dmamap_create; 155 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 156 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; 157 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; 158 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; 159 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; 160 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap; 161 t->_dmamap_sync = _bus_dmamap_sync; 162 163 t->_dmamem_alloc = _bus_dmamem_alloc; 164 t->_dmamem_free = _bus_dmamem_free; 165 t->_dmamem_map = _bus_dmamem_map; 166 t->_dmamem_unmap = _bus_dmamem_unmap; 167 t->_dmamem_mmap = _bus_dmamem_mmap; 168 169 /* 170 * A few notes about SGMAP-mapped DMA on the DWLPx: 171 * 172 * The DWLPx has PCIA-resident SRAM that is used for 173 * the SGMAP page table; there is no TLB. The DWLPA 174 * has room for 32K entries, yielding a total of 256M 175 * of sgva space. The DWLPB has 32K entries or 128K 176 * entries, depending on TBIT, yielding either 256M or 177 * 1G of sgva space. 178 * 179 * This sgva space must be shared across all windows 180 * that wish to use SGMAP-mapped DMA; make sure to 181 * adjust the "sgvabase" argument to alpha_sgmap_init() 182 * accordingly if you create more than one SGMAP-mapped 183 * window. Note that sgvabase != window base. The former 184 * is used to compute indexes into the page table only. 185 * 186 * In the current implementation the first window is a 187 * 2G window direct-mapped mapped at 2G and the second 188 * window is disabled and the third window is a 256M 189 * or 1GB scatter/gather map at 1GB. 190 * 191 * We just punt on trying to support ISA DMA. If you want 192 * try that on a TurboLaser, well, you just lose. 193 */ 194 195 /* 196 * Initialize the page table. 197 */ 198 page_table = 199 (uint32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); 200 for (i = 0; i < lim; i++) 201 page_table[i * SGMAP_PTE_SPACING] = 0; 202 alpha_mb(); 203 204 /* 205 * Initialize the SGMAP for window C: 206 * 207 * Size: 256M or 1GB 208 * Window base: 1GB 209 * SGVA base: 0 210 */ 211 exname = kmem_asprintf("%s_sgmap_a", 212 device_xname(ccp->cc_sc->dwlpx_dev)); 213 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE, 214 0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(uint32_t), 215 (void *)page_table, 0); 216 217 /* 218 * Set up DMA windows for this DWLPx. 219 * 220 * Do this even for all HPCs- even for the nonexistent 221 * one on hose zero of a KFTIA. 222 */ 223 for (i = 0; i < NHPC; i++) { 224 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G; 225 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; 226 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = 227 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; 228 229 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0; 230 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; 231 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0; 232 233 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask; 234 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; 235 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = 236 DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; 237 alpha_mb(); 238 } 239 } 240 241 /* 242 * Return the bus dma tag to be used for the specified bus type. 243 * INTERNAL USE ONLY! 244 */ 245 static bus_dma_tag_t 246 dwlpx_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 247 { 248 struct dwlpx_config *ccp = t->_cookie; 249 250 switch (bustype) { 251 case ALPHA_BUS_PCI: 252 case ALPHA_BUS_EISA: 253 if (dwlpx_always_use_sgmap) { 254 /* 255 * Always use SGMAPs (for testing purposes?) 256 */ 257 return (&ccp->cc_dmat_sgmap); 258 } 259 /* 260 * Give these busses the direct-mapped window; if the 261 * address crosses the threshold, it will fall back 262 * onto the SGMAP window. 263 */ 264 return (&ccp->cc_dmat_direct); 265 266 case ALPHA_BUS_ISA: 267 /* 268 * Don't even bother; it's not easy, given how the 269 * page table is arranged, and it's not really worth 270 * the trouble. 271 */ 272 panic("dwlpx_dma_get_tag: ISA DMA? Forget it..."); 273 /* NOTREACHED */ 274 275 default: 276 panic("dwlpx_dma_get_tag: shouldn't be here, really..."); 277 } 278 } 279 280 /* 281 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 282 */ 283 static int 284 dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) 285 { 286 287 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, 288 t->_sgmap)); 289 } 290 291 /* 292 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 293 */ 294 static int 295 dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 296 { 297 298 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap)); 299 } 300 301 /* 302 * Load a DWLPx SGMAP-mapped DMA map with a uio. 303 */ 304 static int 305 dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 306 { 307 308 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap)); 309 } 310 311 /* 312 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 313 */ 314 static int 315 dwlpx_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) 316 { 317 318 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, 319 t->_sgmap)); 320 } 321 322 /* 323 * Unload a DWLPx DMA map. 324 */ 325 static void 326 dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 327 { 328 329 /* 330 * Invalidate any SGMAP page table entries used by this 331 * mapping. 332 */ 333 pci_sgmap_pte32_unload(t, map, t->_sgmap); 334 335 /* 336 * Do the generic bits of the unload. 337 */ 338 _bus_dmamap_unload_common(t, map); 339 } 340
Indexes created Fri Sep 26 20:09:58 GMT 2025