Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/bs/bshw_pdma.c
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1 /* $NecBSD: bshw_pdma.c,v 1.4 1997/10/31 17:43:39 honda Exp $ */ 2 /* $NetBSD$ */ 3 /* 4 * [NetBSD for NEC PC98 series] 5 * Copyright (c) 1994, 1995, 1996 NetBSD/pc98 porting staff. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /* 32 * Copyright (c) 1994, 1995, 1996 Naofumi HONDA. All rights reserved. 33 */ 34 35 #define LC_SMIT_TIMEOUT 2 /* 2 sec: timeout for a fifo status ready */ 36 37 static BS_INLINE void bshw_lc_smit_start __P((struct bs_softc *, int, u_int)); 38 static int bshw_lc_smit_fstat __P((struct bs_softc *, int, int)); 39 static BS_INLINE void bshw_lc_smit_stop __P((struct bs_softc *)); 40 41 /********************************************************* 42 * SM FIFO (GENERIC) 43 *********************************************************/ 44 void 45 bshw_smitabort(bsc) 46 struct bs_softc *bsc; 47 { 48 if (bsc->sc_hw->hw_flags & BSHW_SMFIFO) 49 bshw_lc_smit_stop(bsc); 50 51 bshw_set_count(bsc, 0); 52 bsc->sc_flags &= ~BSSMITSTART; 53 } 54 55 void 56 bs_smit_xfer_end(ti) 57 struct targ_info *ti; 58 { 59 struct bs_softc *bsc = ti->ti_bsc; 60 struct sc_p *sp = &bsc->sc_p; 61 u_int count; 62 u_char *s; 63 64 bshw_lc_smit_stop(bsc); 65 bsc->sc_flags &= ~BSSMITSTART; 66 67 if (ti->ti_phase == DATAPHASE) 68 { 69 count = bshw_get_count(bsc); 70 if (count < (u_int) sp->datalen) 71 { 72 sp->data += (sp->datalen - count); 73 sp->datalen = count; 74 /* XXX: 75 * strict double checks! 76 * target => wd33c93c transfer counts 77 * wd33c93c => memory transfer counts 78 */ 79 if ((bsc->sc_dmadir & BSHW_READ) && 80 count != bsc->sm_tdatalen) 81 { 82 s = "read count miss"; 83 goto bad; 84 } 85 return; 86 } 87 else if (count == (u_int) sp->datalen) 88 { 89 return; 90 } 91 92 s = "strange count"; 93 } 94 else 95 s = "extra smit interrupt"; 96 97 bad: 98 bs_printf(ti, "smit_xfer_end", s); 99 ti->ti_error |= BSDMAABNORMAL; 100 } 101 102 /********************************************************* 103 * LOGITEC's SMIT TRANSFER 104 *********************************************************/ 105 106 #define BSHW_LC_FSET 0x36 107 #define BSHW_LC_FCTRL 0x44 108 #define FCTRL_EN 0x01 109 #define FCTRL_WRITE 0x02 110 111 #define SF_ABORT 0x08 112 #define SF_RDY 0x10 113 114 #define LC_FSZ DEV_BSIZE 115 #define LC_SFSZ 0x0c 116 #define LC_REST (LC_FSZ - LC_SFSZ) 117 118 static BS_INLINE void 119 bshw_lc_smit_stop(bsc) 120 struct bs_softc *bsc; 121 { 122 123 write_wd33c93(bsc, BSHW_LC_FCTRL, 0); 124 BUS_IOW(cmd_port, CMDP_DMER); 125 } 126 127 static BS_INLINE void 128 bshw_lc_smit_start(bsc, count, direction) 129 struct bs_softc *bsc; 130 int count; 131 u_int direction; 132 { 133 u_int8_t pval, val = read_wd33c93(bsc, BSHW_LC_FSET); 134 135 bsc->sc_flags |= BSSMITSTART; 136 bshw_set_count(bsc, count); 137 138 pval = FCTRL_EN; 139 if ((direction & BSHW_READ) == 0) 140 pval |= (val & 0xe0) | FCTRL_WRITE; 141 write_wd33c93(bsc, BSHW_LC_FCTRL, pval); 142 bshw_start_xfer(bsc); 143 } 144 145 static int 146 bshw_lc_smit_fstat(bsc, wc, read) 147 struct bs_softc *bsc; 148 int wc, read; 149 { 150 u_int8_t stat; 151 152 #define ALWAYS_ABORT 153 #ifdef ALWAYS_ABORT 154 if (read == BSHW_READ) 155 { 156 while (wc -- > 0) 157 { 158 BUS_IO_WEIGHT; 159 stat = BUS_IOR(cmd_port); 160 if (stat & SF_RDY) 161 return 0; 162 if (stat & SF_ABORT) 163 return EIO; 164 } 165 } 166 else 167 { 168 #endif /* ALWAYS_ABORT */ 169 while (wc -- > 0) 170 { 171 BUS_IO_WEIGHT; 172 stat = BUS_IOR(cmd_port); 173 if (stat & SF_ABORT) 174 return EIO; 175 if (stat & SF_RDY) 176 return 0; 177 } 178 #ifdef ALWAYS_ABORT 179 } 180 #endif /* ALWAYS_ABORT */ 181 182 bs_poll_timeout(bsc, "bshw_lc_smit"); 183 return EIO; 184 } 185 186 void 187 bs_lc_smit_xfer(ti, direction) 188 struct targ_info *ti; 189 u_int direction; 190 { 191 struct bs_softc *bsc = ti->ti_bsc; 192 struct sc_p *sp = &bsc->sc_p; 193 int datalen, count, wc = LC_SMIT_TIMEOUT * 1024 * 1024; 194 u_int8_t *data; 195 196 sp->bufp = NULL; 197 sp->seglen = 0; 198 data = sp->data; 199 datalen = sp->datalen; 200 201 bsc->sc_dmadir = direction; 202 bshw_set_dma_trans(bsc, ti->ti_cfgflags); 203 bshw_lc_smit_start(bsc, sp->datalen, direction); 204 205 if (direction & BSHW_READ) 206 { 207 do 208 { 209 if (bshw_lc_smit_fstat(bsc, wc, BSHW_READ)) 210 break; 211 212 count = (datalen > LC_FSZ ? LC_FSZ : datalen); 213 #ifdef __FreeBSD__ 214 memcopy((u_int8_t *)ti->sm_offset, data, count); 215 #else /* NetBSD */ 216 bus_space_read_region_4(bsc->sc_memt, bsc->sc_memh, 217 ti->sm_offset, (u_int32_t *) data, count >> 2); 218 #endif /* NetBSD */ 219 data += count; 220 datalen -= count; 221 } 222 while (datalen > 0); 223 224 bsc->sm_tdatalen = datalen; 225 } 226 else 227 { 228 do 229 { 230 if (bshw_lc_smit_fstat(bsc, wc, BSHW_WRITE)) 231 break; 232 233 count = (datalen > LC_SFSZ ? LC_SFSZ : datalen); 234 #ifdef __FreeBSD__ 235 memcopy(data, (u_int8_t *)ti->sm_offset, count); 236 #else /* NetBSD */ 237 bus_space_write_region_4(bsc->sc_memt, bsc->sc_memh, 238 ti->sm_offset, (u_int32_t *) data, count >> 2); 239 #endif /* NetBSD */ 240 data += count; 241 datalen -= count; 242 243 if (bshw_lc_smit_fstat(bsc, wc, BSHW_WRITE)) 244 break; 245 246 count = (datalen > LC_REST ? LC_REST : datalen); 247 #ifdef __FreeBSD__ 248 memcopy(data, (u_int8_t *)(ti->sm_offset + LC_SFSZ), count); 249 #else /* NetBSD */ 250 bus_space_write_region_4(bsc->sc_memt, bsc->sc_memh, 251 ti->sm_offset + LC_SFSZ, 252 (u_int32_t *) data, count >> 2); 253 #endif /* NetBSD */ 254 data += count; 255 datalen -= count; 256 } 257 while (datalen > 0); 258 } 259 }
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