1 /* $NetBSD: hpcdma.c,v 1.7 2003/07/15 03:35:53 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 2001 Wayne Knowles 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Wayne Knowles 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Support for SCSI DMA provided by the HPC. 41 * 42 * Note: We use SCSI0 offsets, etc. here. Since the layout of SCSI0 43 * and SCSI1 are the same, this is no problem. 44 */ 45 46 #include <sys/cdefs.h> 47 __KERNEL_RCSID(0, "$NetBSD: hpcdma.c,v 1.7 2003/07/15 03:35:53 lukem Exp $"); 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/device.h> 52 #include <sys/buf.h> 53 54 #include <uvm/uvm_extern.h> 55 56 #include <machine/bus.h> 57 58 #include <sgimips/hpc/hpcvar.h> 59 #include <sgimips/hpc/hpcreg.h> 60 #include <sgimips/hpc/hpcdma.h> 61 62 /* 63 * Allocate DMA Chain descriptor list 64 */ 65 void 66 hpcdma_init(struct hpc_attach_args *haa, struct hpc_dma_softc *sc, int ndesc) 67 { 68 bus_dma_segment_t seg; 69 int rseg, allocsz; 70 71 sc->sc_bst = haa->ha_st; 72 sc->sc_dmat = haa->ha_dmat; 73 sc->sc_ndesc = ndesc; 74 sc->sc_flags = 0; 75 76 if (bus_space_subregion(haa->ha_st, haa->ha_sh, haa->ha_dmaoff, 77 HPC_SCSI0_REGS_SIZE, &sc->sc_bsh) != 0) { 78 printf(": can't map DMA registers\n"); 79 return; 80 } 81 82 /* Alloc 1 additional descriptor - needed for DMA bug fix */ 83 allocsz = sizeof(struct hpc_dma_desc) * (ndesc + 1); 84 KASSERT(allocsz <= PAGE_SIZE); 85 86 if (bus_dmamap_create(sc->sc_dmat, PAGE_SIZE, 1 /*seg*/, 87 PAGE_SIZE, 0, BUS_DMA_WAITOK, 88 &sc->sc_dmamap) != 0) { 89 printf(": failed to create dmamap\n"); 90 return; 91 } 92 93 /* 94 * Allocate a block of memory for dma chaining pointers 95 */ 96 if (bus_dmamem_alloc(sc->sc_dmat, allocsz, 0, 0, 97 &seg, 1, &rseg, BUS_DMA_NOWAIT)) { 98 printf(": can't allocate sglist\n"); 99 return; 100 } 101 /* Map pages into kernel memory */ 102 if (bus_dmamem_map(sc->sc_dmat, &seg, rseg, allocsz, 103 (caddr_t *)&sc->sc_desc_kva, BUS_DMA_NOWAIT)) { 104 printf(": can't map sglist\n"); 105 bus_dmamem_free(sc->sc_dmat, &seg, rseg); 106 return; 107 } 108 109 if (bus_dmamap_load(sc->sc_dmat, sc->sc_dmamap, sc->sc_desc_kva, 110 allocsz, NULL, BUS_DMA_NOWAIT)) { 111 printf(": can't load sglist\n"); 112 return; 113 } 114 115 sc->sc_desc_pa = (void *) sc->sc_dmamap->dm_segs[0].ds_addr; 116 } 117 118 119 void 120 hpcdma_sglist_create(struct hpc_dma_softc *sc, bus_dmamap_t dmamap) 121 { 122 struct hpc_dma_desc *hva, *hpa; 123 bus_dma_segment_t *segp; 124 int i; 125 126 KASSERT(dmamap->dm_nsegs <= sc->sc_ndesc); 127 128 hva = sc->sc_desc_kva; 129 hpa = sc->sc_desc_pa; 130 segp = dmamap->dm_segs; 131 132 #ifdef DMA_DEBUG 133 printf("DMA_SGLIST<"); 134 #endif 135 for (i = dmamap->dm_nsegs; i; i--) { 136 #ifdef DMA_DEBUG 137 printf("%p:%ld, ", (void *)segp->ds_addr, segp->ds_len); 138 #endif 139 hva->hdd_bufptr = segp->ds_addr; 140 hva->hdd_ctl = segp->ds_len; 141 hva->hdd_descptr = (u_int32_t) ++hpa; 142 ++hva; ++segp; 143 } 144 /* Work around HPC3 DMA bug */ 145 hva->hdd_bufptr = 0; 146 hva->hdd_ctl = HDD_CTL_EOCHAIN; 147 hva->hdd_descptr = 0; 148 hva++; 149 #ifdef DMA_DEBUG 150 printf(">\n"); 151 #endif 152 bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamap, 153 0, sc->sc_dmamap->dm_mapsize, 154 BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); 155 156 /* Load DMA Descriptor list */ 157 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_NDBP, 158 (u_int32_t)sc->sc_desc_pa); 159 } 160 161 void 162 hpcdma_cntl(struct hpc_dma_softc *sc, uint32_t mode) 163 { 164 165 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, mode); 166 } 167 168 void 169 hpcdma_reset(struct hpc_dma_softc *sc) 170 { 171 172 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 173 HPC_DMACTL_RESET); 174 delay(100); 175 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 0); 176 delay(1000); 177 } 178 179 void 180 hpcdma_flush(struct hpc_dma_softc *sc) 181 { 182 u_int32_t mode; 183 184 mode = bus_space_read_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL); 185 bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 186 mode | HPC_DMACTL_FLUSH); 187 188 /* Wait for Active bit to drop */ 189 while (bus_space_read_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL) & 190 HPC_DMACTL_ACTIVE) { 191 bus_space_barrier(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 4, 192 BUS_SPACE_BARRIER_READ); 193 } 194 } 195