Annotation of sys/arch/alpha/pci/apecs_dma.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: apecs_dma.c,v 1.5 2006/04/04 21:20:40 brad Exp $ */
! 2: /* $NetBSD: apecs_dma.c,v 1.13 2000/06/29 08:58:45 mrg Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
! 10: * NASA Ames Research Center.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: /*
! 42: * XXX - We should define this before including bus.h, but since other stuff
! 43: * pulls in bus.h we must do this here.
! 44: */
! 45: #define _ALPHA_BUS_DMA_PRIVATE
! 46:
! 47: #include <sys/param.h>
! 48: #include <sys/systm.h>
! 49: #include <sys/kernel.h>
! 50: #include <sys/device.h>
! 51: #include <sys/malloc.h>
! 52:
! 53: #include <uvm/uvm_extern.h>
! 54:
! 55: #include <machine/bus.h>
! 56:
! 57: #include <dev/pci/pcireg.h>
! 58: #include <dev/pci/pcivar.h>
! 59: #include <alpha/pci/apecsreg.h>
! 60: #include <alpha/pci/apecsvar.h>
! 61:
! 62: bus_dma_tag_t apecs_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
! 63:
! 64: int apecs_bus_dmamap_load_sgmap(bus_dma_tag_t, bus_dmamap_t, void *,
! 65: bus_size_t, struct proc *, int);
! 66:
! 67: int apecs_bus_dmamap_load_mbuf_sgmap(bus_dma_tag_t, bus_dmamap_t,
! 68: struct mbuf *, int);
! 69:
! 70: int apecs_bus_dmamap_load_uio_sgmap(bus_dma_tag_t, bus_dmamap_t,
! 71: struct uio *, int);
! 72:
! 73: int apecs_bus_dmamap_load_raw_sgmap(bus_dma_tag_t, bus_dmamap_t,
! 74: bus_dma_segment_t *, int, bus_size_t, int);
! 75:
! 76: void apecs_bus_dmamap_unload_sgmap(bus_dma_tag_t, bus_dmamap_t);
! 77:
! 78: /*
! 79: * Direct-mapped window: 1G at 1G
! 80: */
! 81: #define APECS_DIRECT_MAPPED_BASE (1*1024*1024*1024)
! 82: #define APECS_DIRECT_MAPPED_SIZE (1*1024*1024*1024)
! 83:
! 84: /*
! 85: * SGMAP window: 8M at 8M
! 86: */
! 87: #define APECS_SGMAP_MAPPED_BASE (8*1024*1024)
! 88: #define APECS_SGMAP_MAPPED_SIZE (8*1024*1024)
! 89:
! 90: /* APECS has a 256-byte out-bound DMA prefetch threshold. */
! 91: #define APECS_SGMAP_PFTHRESH 256
! 92:
! 93: /*
! 94: * Macro to flush APECS scatter/gather TLB.
! 95: */
! 96: #define APECS_TLB_INVALIDATE() \
! 97: do { \
! 98: alpha_mb(); \
! 99: REGVAL(EPIC_TBIA) = 0; \
! 100: alpha_mb(); \
! 101: } while (0)
! 102:
! 103: void
! 104: apecs_dma_init(acp)
! 105: struct apecs_config *acp;
! 106: {
! 107: bus_addr_t tbase;
! 108: bus_dma_tag_t t;
! 109:
! 110: /*
! 111: * Initialize the DMA tag used for direct-mapped DMA.
! 112: */
! 113: t = &acp->ac_dmat_direct;
! 114: t->_cookie = acp;
! 115: t->_wbase = APECS_DIRECT_MAPPED_BASE;
! 116: t->_wsize = APECS_DIRECT_MAPPED_SIZE;
! 117: t->_next_window = NULL;
! 118: t->_boundary = 0;
! 119: t->_sgmap = NULL;
! 120: t->_get_tag = apecs_dma_get_tag;
! 121: t->_dmamap_create = _bus_dmamap_create;
! 122: t->_dmamap_destroy = _bus_dmamap_destroy;
! 123: t->_dmamap_load = _bus_dmamap_load_direct;
! 124: t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
! 125: t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
! 126: t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
! 127: t->_dmamap_unload = _bus_dmamap_unload;
! 128: t->_dmamap_sync = _bus_dmamap_sync;
! 129:
! 130: t->_dmamem_alloc = _bus_dmamem_alloc;
! 131: t->_dmamem_free = _bus_dmamem_free;
! 132: t->_dmamem_map = _bus_dmamem_map;
! 133: t->_dmamem_unmap = _bus_dmamem_unmap;
! 134: t->_dmamem_mmap = _bus_dmamem_mmap;
! 135:
! 136: /*
! 137: * Initialize the DMA tag used for sgmap-mapped DMA.
! 138: */
! 139: t = &acp->ac_dmat_sgmap;
! 140: t->_cookie = acp;
! 141: t->_wbase = APECS_SGMAP_MAPPED_BASE;
! 142: t->_wsize = APECS_SGMAP_MAPPED_SIZE;
! 143: t->_next_window = NULL;
! 144: t->_boundary = 0;
! 145: t->_sgmap = &acp->ac_sgmap;
! 146: t->_pfthresh = APECS_SGMAP_PFTHRESH;
! 147: t->_get_tag = apecs_dma_get_tag;
! 148: t->_dmamap_create = alpha_sgmap_dmamap_create;
! 149: t->_dmamap_destroy = alpha_sgmap_dmamap_destroy;
! 150: t->_dmamap_load = apecs_bus_dmamap_load_sgmap;
! 151: t->_dmamap_load_mbuf = apecs_bus_dmamap_load_mbuf_sgmap;
! 152: t->_dmamap_load_uio = apecs_bus_dmamap_load_uio_sgmap;
! 153: t->_dmamap_load_raw = apecs_bus_dmamap_load_raw_sgmap;
! 154: t->_dmamap_unload = apecs_bus_dmamap_unload_sgmap;
! 155: t->_dmamap_sync = _bus_dmamap_sync;
! 156:
! 157: t->_dmamem_alloc = _bus_dmamem_alloc;
! 158: t->_dmamem_free = _bus_dmamem_free;
! 159: t->_dmamem_map = _bus_dmamem_map;
! 160: t->_dmamem_unmap = _bus_dmamem_unmap;
! 161: t->_dmamem_mmap = _bus_dmamem_mmap;
! 162:
! 163: /*
! 164: * The firmware has set up window 2 as a 1G direct-mapped DMA
! 165: * window beginning at 1G. We leave it alone. Disable
! 166: * window 1.
! 167: */
! 168: REGVAL(EPIC_PCI_BASE_1) = 0;
! 169: alpha_mb();
! 170:
! 171: /*
! 172: * Initialize the SGMAP.
! 173: */
! 174: alpha_sgmap_init(t, &acp->ac_sgmap, "apecs_sgmap",
! 175: APECS_SGMAP_MAPPED_BASE, 0, APECS_SGMAP_MAPPED_SIZE,
! 176: sizeof(u_int64_t), NULL, 0);
! 177:
! 178: /*
! 179: * Set up window 1 as an 8MB SGMAP-mapped window
! 180: * starting at 8MB.
! 181: */
! 182: REGVAL(EPIC_PCI_BASE_1) = APECS_SGMAP_MAPPED_BASE |
! 183: EPIC_PCI_BASE_SGEN | EPIC_PCI_BASE_WENB;
! 184: alpha_mb();
! 185:
! 186: REGVAL(EPIC_PCI_MASK_1) = EPIC_PCI_MASK_8M;
! 187: alpha_mb();
! 188:
! 189: tbase = acp->ac_sgmap.aps_ptpa >> EPIC_TBASE_SHIFT;
! 190: if ((tbase & EPIC_TBASE_T_BASE) != tbase)
! 191: panic("apecs_dma_init: bad page table address");
! 192: REGVAL(EPIC_TBASE_1) = tbase;
! 193: alpha_mb();
! 194:
! 195: APECS_TLB_INVALIDATE();
! 196:
! 197: /* XXX XXX BEGIN XXX XXX */
! 198: { /* XXX */
! 199: extern paddr_t alpha_XXX_dmamap_or; /* XXX */
! 200: alpha_XXX_dmamap_or = APECS_DIRECT_MAPPED_BASE; /* XXX */
! 201: } /* XXX */
! 202: /* XXX XXX END XXX XXX */
! 203: }
! 204:
! 205: /*
! 206: * Return the bus dma tag to be used for the specified bus type.
! 207: * INTERNAL USE ONLY!
! 208: */
! 209: bus_dma_tag_t
! 210: apecs_dma_get_tag(t, bustype)
! 211: bus_dma_tag_t t;
! 212: alpha_bus_t bustype;
! 213: {
! 214: struct apecs_config *acp = t->_cookie;
! 215:
! 216: switch (bustype) {
! 217: case ALPHA_BUS_PCI:
! 218: case ALPHA_BUS_EISA:
! 219: /*
! 220: * Systems with an APECS can only support 1G
! 221: * of memory, so we use the direct-mapped window
! 222: * on busses that have 32-bit DMA.
! 223: */
! 224: return (&acp->ac_dmat_direct);
! 225:
! 226: case ALPHA_BUS_ISA:
! 227: /*
! 228: * ISA doesn't have enough address bits to use
! 229: * the direct-mapped DMA window, so we must use
! 230: * SGMAPs.
! 231: */
! 232: return (&acp->ac_dmat_sgmap);
! 233:
! 234: default:
! 235: panic("apecs_dma_get_tag: shouldn't be here, really...");
! 236: }
! 237: }
! 238:
! 239: /*
! 240: * Load an APECS SGMAP-mapped DMA map with a linear buffer.
! 241: */
! 242: int
! 243: apecs_bus_dmamap_load_sgmap(t, map, buf, buflen, p, flags)
! 244: bus_dma_tag_t t;
! 245: bus_dmamap_t map;
! 246: void *buf;
! 247: bus_size_t buflen;
! 248: struct proc *p;
! 249: int flags;
! 250: {
! 251: int error;
! 252:
! 253: error = pci_sgmap_pte64_load(t, map, buf, buflen, p, flags,
! 254: t->_sgmap);
! 255: if (error == 0)
! 256: APECS_TLB_INVALIDATE();
! 257:
! 258: return (error);
! 259: }
! 260:
! 261: /*
! 262: * Load an APECS SGMAP-mapped DMA map with an mbuf chain.
! 263: */
! 264: int
! 265: apecs_bus_dmamap_load_mbuf_sgmap(t, map, m, flags)
! 266: bus_dma_tag_t t;
! 267: bus_dmamap_t map;
! 268: struct mbuf *m;
! 269: int flags;
! 270: {
! 271: int error;
! 272:
! 273: error = pci_sgmap_pte64_load_mbuf(t, map, m, flags, t->_sgmap);
! 274: if (error == 0)
! 275: APECS_TLB_INVALIDATE();
! 276:
! 277: return (error);
! 278: }
! 279:
! 280: /*
! 281: * Load an APECS SGMAP-mapped DMA map with a uio.
! 282: */
! 283: int
! 284: apecs_bus_dmamap_load_uio_sgmap(t, map, uio, flags)
! 285: bus_dma_tag_t t;
! 286: bus_dmamap_t map;
! 287: struct uio *uio;
! 288: int flags;
! 289: {
! 290: int error;
! 291:
! 292: error = pci_sgmap_pte64_load_uio(t, map, uio, flags, t->_sgmap);
! 293: if (error == 0)
! 294: APECS_TLB_INVALIDATE();
! 295:
! 296: return (error);
! 297: }
! 298:
! 299: /*
! 300: * Load an APECS SGMAP-mapped DMA map with raw memory.
! 301: */
! 302: int
! 303: apecs_bus_dmamap_load_raw_sgmap(t, map, segs, nsegs, size, flags)
! 304: bus_dma_tag_t t;
! 305: bus_dmamap_t map;
! 306: bus_dma_segment_t *segs;
! 307: int nsegs;
! 308: bus_size_t size;
! 309: int flags;
! 310: {
! 311: int error;
! 312:
! 313: error = pci_sgmap_pte64_load_raw(t, map, segs, nsegs, size, flags,
! 314: t->_sgmap);
! 315: if (error == 0)
! 316: APECS_TLB_INVALIDATE();
! 317:
! 318: return (error);
! 319: }
! 320:
! 321: /*
! 322: * Unload an APECS DMA map.
! 323: */
! 324: void
! 325: apecs_bus_dmamap_unload_sgmap(t, map)
! 326: bus_dma_tag_t t;
! 327: bus_dmamap_t map;
! 328: {
! 329:
! 330: /*
! 331: * Invalidate any SGMAP page table entries used by this
! 332: * mapping.
! 333: */
! 334: pci_sgmap_pte64_unload(t, map, t->_sgmap);
! 335: APECS_TLB_INVALIDATE();
! 336:
! 337: /*
! 338: * Do the generic bits of the unload.
! 339: */
! 340: _bus_dmamap_unload(t, map);
! 341: }
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