dwlpx_dma.c revision 1.29
1 /* $NetBSD: dwlpx_dma.c,v 1.29 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: dwlpx_dma.c,v 1.29 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/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 #include <alpha/pci/pci_kn8ae.h> 54 55 static bus_dma_tag_t dwlpx_dma_get_tag(bus_dma_tag_t, alpha_bus_t); 56 57 static int dwlpx_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *, 58 bus_size_t, struct proc *, int); 59 60 static int dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t, 61 struct mbuf *, int); 62 63 static int dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t, 64 struct uio *, int); 65 66 static int dwlpx_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t, 67 bus_dma_segment_t *, int, bus_size_t, int); 68 69 static void dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t); 70 71 /* 72 * Direct-mapped window: 2G at 2G 73 */ 74 #define DWLPx_DIRECT_MAPPED_BASE (2UL*1024UL*1024UL*1024UL) 75 #define DWLPx_DIRECT_MAPPED_SIZE (2UL*1024UL*1024UL*1024UL) 76 77 /* 78 * SGMAP window A: 256M or 1G at 1G 79 */ 80 #define DWLPx_SG_MAPPED_BASE (1*1024*1024*1024) 81 #define DWLPx_SG_MAPPED_SIZE(x) ((x) * PAGE_SIZE) 82 83 /* DWLPx has a 256-byte out-bound DMA prefetch threshold. */ 84 #define DWLPx_SG_MAPPED_PFTHRESH 256 85 86 /* 87 * Set this to always use SGMAPs. 88 */ 89 #ifdef DWLPX_ALWAYS_USE_SGMAP 90 int dwlpx_always_use_sgmap = 1; 91 #else 92 int dwlpx_always_use_sgmap = 0; 93 #endif 94 95 void 96 dwlpx_dma_init(struct dwlpx_config *ccp) 97 { 98 char *exname; 99 bus_dma_tag_t t; 100 uint32_t *page_table; 101 int i, lim, wmask; 102 103 /* 104 * Determine size of Window C based on the amount of SGMAP 105 * page table SRAM available. 106 */ 107 if (ccp->cc_sc->dwlpx_sgmapsz == DWLPX_SG128K) { 108 lim = 128 * 1024; 109 wmask = PCIA_WMASK_1G; 110 } else { 111 lim = 32 * 1024; 112 wmask = PCIA_WMASK_256M; 113 } 114 115 /* 116 * Initialize the DMA tag used for direct-mapped DMA. Chain 117 * this window to the SGMAP window, because we might have 118 * a lot of memory in the machine. 119 */ 120 t = &ccp->cc_dmat_direct; 121 t->_cookie = ccp; 122 t->_wbase = DWLPx_DIRECT_MAPPED_BASE; 123 t->_wsize = DWLPx_DIRECT_MAPPED_SIZE; 124 t->_next_window = &ccp->cc_dmat_sgmap; 125 t->_boundary = 0; 126 t->_sgmap = NULL; 127 t->_get_tag = dwlpx_dma_get_tag; 128 t->_dmamap_create = _bus_dmamap_create; 129 t->_dmamap_destroy = _bus_dmamap_destroy; 130 t->_dmamap_load = _bus_dmamap_load_direct; 131 t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct; 132 t->_dmamap_load_uio = _bus_dmamap_load_uio_direct; 133 t->_dmamap_load_raw = _bus_dmamap_load_raw_direct; 134 t->_dmamap_unload = _bus_dmamap_unload; 135 t->_dmamap_sync = _bus_dmamap_sync; 136 137 t->_dmamem_alloc = _bus_dmamem_alloc; 138 t->_dmamem_free = _bus_dmamem_free; 139 t->_dmamem_map = _bus_dmamem_map; 140 t->_dmamem_unmap = _bus_dmamem_unmap; 141 t->_dmamem_mmap = _bus_dmamem_mmap; 142 143 /* 144 * Initialize the DMA tag used for sgmap-mapped DMA. 145 */ 146 t = &ccp->cc_dmat_sgmap; 147 t->_cookie = ccp; 148 t->_wbase = DWLPx_SG_MAPPED_BASE; 149 t->_wsize = DWLPx_SG_MAPPED_SIZE(lim); 150 t->_next_window = NULL; 151 t->_boundary = 0; 152 t->_sgmap = &ccp->cc_sgmap; 153 t->_pfthresh = DWLPx_SG_MAPPED_PFTHRESH; 154 t->_get_tag = dwlpx_dma_get_tag; 155 t->_dmamap_create = alpha_sgmap_dmamap_create; 156 t->_dmamap_destroy = alpha_sgmap_dmamap_destroy; 157 t->_dmamap_load = dwlpx_bus_dmamap_load_sgmap; 158 t->_dmamap_load_mbuf = dwlpx_bus_dmamap_load_mbuf_sgmap; 159 t->_dmamap_load_uio = dwlpx_bus_dmamap_load_uio_sgmap; 160 t->_dmamap_load_raw = dwlpx_bus_dmamap_load_raw_sgmap; 161 t->_dmamap_unload = dwlpx_bus_dmamap_unload_sgmap; 162 t->_dmamap_sync = _bus_dmamap_sync; 163 164 t->_dmamem_alloc = _bus_dmamem_alloc; 165 t->_dmamem_free = _bus_dmamem_free; 166 t->_dmamem_map = _bus_dmamem_map; 167 t->_dmamem_unmap = _bus_dmamem_unmap; 168 t->_dmamem_mmap = _bus_dmamem_mmap; 169 170 /* 171 * A few notes about SGMAP-mapped DMA on the DWLPx: 172 * 173 * The DWLPx has PCIA-resident SRAM that is used for 174 * the SGMAP page table; there is no TLB. The DWLPA 175 * has room for 32K entries, yielding a total of 256M 176 * of sgva space. The DWLPB has 32K entries or 128K 177 * entries, depending on TBIT, yielding either 256M or 178 * 1G of sgva space. 179 * 180 * This sgva space must be shared across all windows 181 * that wish to use SGMAP-mapped DMA; make sure to 182 * adjust the "sgvabase" argument to alpha_sgmap_init() 183 * accordingly if you create more than one SGMAP-mapped 184 * window. Note that sgvabase != window base. The former 185 * is used to compute indexes into the page table only. 186 * 187 * In the current implementation the first window is a 188 * 2G window direct-mapped mapped at 2G and the second 189 * window is disabled and the third window is a 256M 190 * or 1GB scatter/gather map at 1GB. 191 * 192 * We just punt on trying to support ISA DMA. If you want 193 * try that on a TurboLaser, well, you just lose. 194 */ 195 196 /* 197 * Initialize the page table. 198 */ 199 page_table = 200 (uint32_t *)ALPHA_PHYS_TO_K0SEG(PCIA_SGMAP_PT + ccp->cc_sysbase); 201 for (i = 0; i < lim; i++) 202 page_table[i * SGMAP_PTE_SPACING] = 0; 203 alpha_mb(); 204 205 /* 206 * Initialize the SGMAP for window C: 207 * 208 * Size: 256M or 1GB 209 * Window base: 1GB 210 * SGVA base: 0 211 */ 212 exname = kmem_asprintf("%s_sgmap_a", 213 device_xname(ccp->cc_sc->dwlpx_dev)); 214 alpha_sgmap_init(t, &ccp->cc_sgmap, exname, DWLPx_SG_MAPPED_BASE, 215 0, DWLPx_SG_MAPPED_SIZE(lim), sizeof(uint32_t), 216 (void *)page_table, 0); 217 218 /* 219 * Set up DMA windows for this DWLPx. 220 * 221 * Do this even for all HPCs- even for the nonexistent 222 * one on hose zero of a KFTIA. 223 */ 224 for (i = 0; i < NHPC; i++) { 225 REGVAL(PCIA_WMASK_A(i) + ccp->cc_sysbase) = PCIA_WMASK_2G; 226 REGVAL(PCIA_TBASE_A(i) + ccp->cc_sysbase) = 0; 227 REGVAL(PCIA_WBASE_A(i) + ccp->cc_sysbase) = 228 DWLPx_DIRECT_MAPPED_BASE | PCIA_WBASE_W_EN; 229 230 REGVAL(PCIA_WMASK_B(i) + ccp->cc_sysbase) = 0; 231 REGVAL(PCIA_TBASE_B(i) + ccp->cc_sysbase) = 0; 232 REGVAL(PCIA_WBASE_B(i) + ccp->cc_sysbase) = 0; 233 234 REGVAL(PCIA_WMASK_C(i) + ccp->cc_sysbase) = wmask; 235 REGVAL(PCIA_TBASE_C(i) + ccp->cc_sysbase) = 0; 236 REGVAL(PCIA_WBASE_C(i) + ccp->cc_sysbase) = 237 DWLPx_SG_MAPPED_BASE | PCIA_WBASE_W_EN | PCIA_WBASE_SG_EN; 238 alpha_mb(); 239 } 240 } 241 242 /* 243 * Return the bus dma tag to be used for the specified bus type. 244 * INTERNAL USE ONLY! 245 */ 246 static bus_dma_tag_t 247 dwlpx_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype) 248 { 249 struct dwlpx_config *ccp = t->_cookie; 250 251 switch (bustype) { 252 case ALPHA_BUS_PCI: 253 case ALPHA_BUS_EISA: 254 if (dwlpx_always_use_sgmap) { 255 /* 256 * Always use SGMAPs (for testing purposes?) 257 */ 258 return (&ccp->cc_dmat_sgmap); 259 } 260 /* 261 * Give these busses the direct-mapped window; if the 262 * address crosses the threshold, it will fall back 263 * onto the SGMAP window. 264 */ 265 return (&ccp->cc_dmat_direct); 266 267 case ALPHA_BUS_ISA: 268 /* 269 * Don't even bother; it's not easy, given how the 270 * page table is arranged, and it's not really worth 271 * the trouble. 272 */ 273 panic("dwlpx_dma_get_tag: ISA DMA? Forget it..."); 274 /* NOTREACHED */ 275 276 default: 277 panic("dwlpx_dma_get_tag: shouldn't be here, really..."); 278 } 279 } 280 281 /* 282 * Load a DWLPx SGMAP-mapped DMA map with a linear buffer. 283 */ 284 static int 285 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) 286 { 287 288 return (pci_sgmap_pte32_load(t, map, buf, buflen, p, flags, 289 t->_sgmap)); 290 } 291 292 /* 293 * Load a DWLPx SGMAP-mapped DMA map with an mbuf chain. 294 */ 295 static int 296 dwlpx_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m, int flags) 297 { 298 299 return (pci_sgmap_pte32_load_mbuf(t, map, m, flags, t->_sgmap)); 300 } 301 302 /* 303 * Load a DWLPx SGMAP-mapped DMA map with a uio. 304 */ 305 static int 306 dwlpx_bus_dmamap_load_uio_sgmap(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) 307 { 308 309 return (pci_sgmap_pte32_load_uio(t, map, uio, flags, t->_sgmap)); 310 } 311 312 /* 313 * Load a DWLPx SGMAP-mapped DMA map with raw memory. 314 */ 315 static int 316 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) 317 { 318 319 return (pci_sgmap_pte32_load_raw(t, map, segs, nsegs, size, flags, 320 t->_sgmap)); 321 } 322 323 /* 324 * Unload a DWLPx DMA map. 325 */ 326 static void 327 dwlpx_bus_dmamap_unload_sgmap(bus_dma_tag_t t, bus_dmamap_t map) 328 { 329 330 /* 331 * Invalidate any SGMAP page table entries used by this 332 * mapping. 333 */ 334 pci_sgmap_pte32_unload(t, map, t->_sgmap); 335 336 /* 337 * Do the generic bits of the unload. 338 */ 339 _bus_dmamap_unload_common(t, map); 340 } 341
Indexes created Sat Oct 25 16:10:12 GMT 2025