hpcdma.c revision 1.1.2.2
1 1.1.2.2 thorpej /* $NetBSD: hpcdma.c,v 1.1.2.2 2001/08/25 06:15:49 thorpej Exp $ */ 2 1.1.2.2 thorpej 3 1.1.2.2 thorpej /* 4 1.1.2.2 thorpej * Copyright (c) 2001 Wayne Knowles 5 1.1.2.2 thorpej * All rights reserved. 6 1.1.2.2 thorpej * 7 1.1.2.2 thorpej * This code is derived from software contributed to The NetBSD Foundation 8 1.1.2.2 thorpej * by Wayne Knowles 9 1.1.2.2 thorpej * 10 1.1.2.2 thorpej * Redistribution and use in source and binary forms, with or without 11 1.1.2.2 thorpej * modification, are permitted provided that the following conditions 12 1.1.2.2 thorpej * are met: 13 1.1.2.2 thorpej * 1. Redistributions of source code must retain the above copyright 14 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer. 15 1.1.2.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 16 1.1.2.2 thorpej * notice, this list of conditions and the following disclaimer in the 17 1.1.2.2 thorpej * documentation and/or other materials provided with the distribution. 18 1.1.2.2 thorpej * 3. All advertising materials mentioning features or use of this software 19 1.1.2.2 thorpej * must display the following acknowledgement: 20 1.1.2.2 thorpej * This product includes software developed by the NetBSD 21 1.1.2.2 thorpej * Foundation, Inc. and its contributors. 22 1.1.2.2 thorpej * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1.2.2 thorpej * contributors may be used to endorse or promote products derived 24 1.1.2.2 thorpej * from this software without specific prior written permission. 25 1.1.2.2 thorpej * 26 1.1.2.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1.2.2 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1.2.2 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1.2.2 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1.2.2 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1.2.2 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1.2.2 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1.2.2 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1.2.2 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1.2.2 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1.2.2 thorpej * POSSIBILITY OF SUCH DAMAGE. 37 1.1.2.2 thorpej */ 38 1.1.2.2 thorpej 39 1.1.2.2 thorpej #include <sys/param.h> 40 1.1.2.2 thorpej #include <sys/systm.h> 41 1.1.2.2 thorpej #include <sys/device.h> 42 1.1.2.2 thorpej #include <sys/buf.h> 43 1.1.2.2 thorpej 44 1.1.2.2 thorpej #include <machine/bus.h> 45 1.1.2.2 thorpej 46 1.1.2.2 thorpej #include <sgimips/hpc/hpcvar.h> 47 1.1.2.2 thorpej #include <sgimips/hpc/hpcreg.h> 48 1.1.2.2 thorpej #include <sgimips/hpc/hpcdma.h> 49 1.1.2.2 thorpej 50 1.1.2.2 thorpej /* 51 1.1.2.2 thorpej * Allocate DMA Chain descriptor list 52 1.1.2.2 thorpej * 53 1.1.2.2 thorpej * XXX: Need to place in device tree 54 1.1.2.2 thorpej */ 55 1.1.2.2 thorpej void 56 1.1.2.2 thorpej hpcdma_init(haa, sc, ndesc) 57 1.1.2.2 thorpej struct hpc_attach_args *haa; 58 1.1.2.2 thorpej struct hpc_dma_softc *sc; 59 1.1.2.2 thorpej int ndesc; 60 1.1.2.2 thorpej { 61 1.1.2.2 thorpej bus_dma_segment_t seg; 62 1.1.2.2 thorpej struct hpc_dma_desc *hdd; 63 1.1.2.2 thorpej int rseg, allocsz; 64 1.1.2.2 thorpej 65 1.1.2.2 thorpej sc->sc_bst = haa->ha_iot; 66 1.1.2.2 thorpej sc->sc_bsh = haa->ha_ioh; 67 1.1.2.2 thorpej sc->sc_dmat = haa->ha_dmat; 68 1.1.2.2 thorpej sc->sc_ndesc = ndesc; 69 1.1.2.2 thorpej sc->sc_flags = 0; 70 1.1.2.2 thorpej 71 1.1.2.2 thorpej /* Alloc 1 additional descriptor - needed for DMA bug fix */ 72 1.1.2.2 thorpej allocsz = sizeof(struct hpc_dma_desc) * (ndesc + 1); 73 1.1.2.2 thorpej KASSERT(allocsz <= NBPG); 74 1.1.2.2 thorpej 75 1.1.2.2 thorpej if (bus_dmamap_create(sc->sc_dmat, NBPG, 1 /*seg*/, 76 1.1.2.2 thorpej NBPG, 0, BUS_DMA_WAITOK, 77 1.1.2.2 thorpej &sc->sc_dmamap) != 0) { 78 1.1.2.2 thorpej printf(": failed to create dmamap\n"); 79 1.1.2.2 thorpej return; 80 1.1.2.2 thorpej } 81 1.1.2.2 thorpej 82 1.1.2.2 thorpej /* 83 1.1.2.2 thorpej * Allocate a block of memory for dma chaining pointers 84 1.1.2.2 thorpej */ 85 1.1.2.2 thorpej if (bus_dmamem_alloc(sc->sc_dmat, allocsz, 0, 0, 86 1.1.2.2 thorpej &seg, 1, &rseg, BUS_DMA_NOWAIT)) { 87 1.1.2.2 thorpej printf(": can't allocate sglist\n"); 88 1.1.2.2 thorpej return; 89 1.1.2.2 thorpej } 90 1.1.2.2 thorpej /* Map pages into kernel memory */ 91 1.1.2.2 thorpej if (bus_dmamem_map(sc->sc_dmat, &seg, rseg, allocsz, 92 1.1.2.2 thorpej (caddr_t *)&hdd, BUS_DMA_NOWAIT)) { 93 1.1.2.2 thorpej printf(": can't map sglist\n"); 94 1.1.2.2 thorpej bus_dmamem_free(sc->sc_dmat, &seg, rseg); 95 1.1.2.2 thorpej return; 96 1.1.2.2 thorpej } 97 1.1.2.2 thorpej 98 1.1.2.2 thorpej if (bus_dmamap_load(sc->sc_dmat, sc->sc_dmamap, hdd, 99 1.1.2.2 thorpej allocsz, NULL, BUS_DMA_NOWAIT)) { 100 1.1.2.2 thorpej printf(": can't load sglist\n"); 101 1.1.2.2 thorpej return; 102 1.1.2.2 thorpej } 103 1.1.2.2 thorpej 104 1.1.2.2 thorpej sc->sc_desc_kva = hdd; 105 1.1.2.2 thorpej sc->sc_desc_pa = (void *) sc->sc_dmamap->dm_segs[0].ds_addr; 106 1.1.2.2 thorpej } 107 1.1.2.2 thorpej 108 1.1.2.2 thorpej 109 1.1.2.2 thorpej void 110 1.1.2.2 thorpej hpcdma_sglist_create(sc, dmamap) 111 1.1.2.2 thorpej struct hpc_dma_softc *sc; 112 1.1.2.2 thorpej bus_dmamap_t dmamap; 113 1.1.2.2 thorpej { 114 1.1.2.2 thorpej struct hpc_dma_desc *hva, *hpa; 115 1.1.2.2 thorpej bus_dma_segment_t *segp; 116 1.1.2.2 thorpej int i; 117 1.1.2.2 thorpej 118 1.1.2.2 thorpej KASSERT(dmamap->dm_nsegs <= sc->sc_ndesc); 119 1.1.2.2 thorpej 120 1.1.2.2 thorpej hva = sc->sc_desc_kva; 121 1.1.2.2 thorpej hpa = sc->sc_desc_pa; 122 1.1.2.2 thorpej segp = dmamap->dm_segs; 123 1.1.2.2 thorpej 124 1.1.2.2 thorpej #ifdef DMA_DEBUG 125 1.1.2.2 thorpej printf("DMA_SGLIST<"); 126 1.1.2.2 thorpej #endif 127 1.1.2.2 thorpej for (i = dmamap->dm_nsegs; i; i--) { 128 1.1.2.2 thorpej #ifdef DMA_DEBUG 129 1.1.2.2 thorpej printf("%p:%ld, ", (void *)segp->ds_addr, segp->ds_len); 130 1.1.2.2 thorpej #endif 131 1.1.2.2 thorpej hva->hdd_bufptr = segp->ds_addr; 132 1.1.2.2 thorpej hva->hdd_ctl = segp->ds_len; 133 1.1.2.2 thorpej hva->hdd_descptr = (u_int32_t) ++hpa; 134 1.1.2.2 thorpej ++hva; ++segp; 135 1.1.2.2 thorpej } 136 1.1.2.2 thorpej /* Work around HPC3 DMA bug */ 137 1.1.2.2 thorpej hva->hdd_bufptr = 0; 138 1.1.2.2 thorpej hva->hdd_ctl = HDD_CTL_EOCHAIN; 139 1.1.2.2 thorpej hva->hdd_descptr = 0; 140 1.1.2.2 thorpej hva++; 141 1.1.2.2 thorpej #ifdef DMA_DEBUG 142 1.1.2.2 thorpej printf(">\n"); 143 1.1.2.2 thorpej #endif 144 1.1.2.2 thorpej bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamap, 145 1.1.2.2 thorpej 0, sc->sc_dmamap->dm_mapsize, 146 1.1.2.2 thorpej BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); 147 1.1.2.2 thorpej 148 1.1.2.2 thorpej /* Load DMA Descriptor list */ 149 1.1.2.2 thorpej bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_NDBP, 150 1.1.2.2 thorpej (u_int32_t)sc->sc_desc_pa); 151 1.1.2.2 thorpej } 152 1.1.2.2 thorpej 153 1.1.2.2 thorpej void 154 1.1.2.2 thorpej hpcdma_cntl(sc, mode) 155 1.1.2.2 thorpej struct hpc_dma_softc *sc; 156 1.1.2.2 thorpej u_int32_t mode; 157 1.1.2.2 thorpej { 158 1.1.2.2 thorpej bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, mode); 159 1.1.2.2 thorpej } 160 1.1.2.2 thorpej 161 1.1.2.2 thorpej void 162 1.1.2.2 thorpej hpcdma_flush(sc) 163 1.1.2.2 thorpej struct hpc_dma_softc *sc; 164 1.1.2.2 thorpej { 165 1.1.2.2 thorpej u_int32_t mode; 166 1.1.2.2 thorpej 167 1.1.2.2 thorpej mode = bus_space_read_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL); 168 1.1.2.2 thorpej bus_space_write_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 169 1.1.2.2 thorpej mode | HPC_DMACTL_FLUSH); 170 1.1.2.2 thorpej 171 1.1.2.2 thorpej /* Wait for Active bit to drop */ 172 1.1.2.2 thorpej while (bus_space_read_4(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL) & 173 1.1.2.2 thorpej HPC_DMACTL_ACTIVE) { 174 1.1.2.2 thorpej bus_space_barrier(sc->sc_bst, sc->sc_bsh, HPC_SCSI0_CTL, 4, 175 1.1.2.2 thorpej BUS_SPACE_BARRIER_READ); 176 1.1.2.2 thorpej } 177 1.1.2.2 thorpej } 178
Indexes created Thu Oct 02 10:09:58 GMT 2025