1 /* $NetBSD: cs89x0isa.c,v 1.3 2001/12/31 22:07:58 thorpej Exp $ */ 2 3 /* 4 * Copyright 1997 5 * Digital Equipment Corporation. All rights reserved. 6 * 7 * This software is furnished under license and may be used and 8 * copied only in accordance with the following terms and conditions. 9 * Subject to these conditions, you may download, copy, install, 10 * use, modify and distribute this software in source and/or binary 11 * form. No title or ownership is transferred hereby. 12 * 13 * 1) Any source code used, modified or distributed must reproduce 14 * and retain this copyright notice and list of conditions as 15 * they appear in the source file. 16 * 17 * 2) No right is granted to use any trade name, trademark, or logo of 18 * Digital Equipment Corporation. Neither the "Digital Equipment 19 * Corporation" name nor any trademark or logo of Digital Equipment 20 * Corporation may be used to endorse or promote products derived 21 * from this software without the prior written permission of 22 * Digital Equipment Corporation. 23 * 24 * 3) This software is provided "AS-IS" and any express or implied 25 * warranties, including but not limited to, any implied warranties 26 * of merchantability, fitness for a particular purpose, or 27 * non-infringement are disclaimed. In no event shall DIGITAL be 28 * liable for any damages whatsoever, and in particular, DIGITAL 29 * shall not be liable for special, indirect, consequential, or 30 * incidental damages or damages for lost profits, loss of 31 * revenue or loss of use, whether such damages arise in contract, 32 * negligence, tort, under statute, in equity, at law or otherwise, 33 * even if advised of the possibility of such damage. 34 */ 35 36 /* isa dma routines for cs89x0 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: cs89x0isa.c,v 1.3 2001/12/31 22:07:58 thorpej Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/mbuf.h> 44 #include <sys/socket.h> 45 #include <sys/device.h> 46 47 #include "rnd.h" 48 #if NRND > 0 49 #include <sys/rnd.h> 50 #endif 51 52 #include <net/if.h> 53 #include <net/if_ether.h> 54 #include <net/if_media.h> 55 56 #include <machine/bus.h> 57 58 #include <dev/isa/isareg.h> 59 #include <dev/isa/isavar.h> 60 #include <dev/isa/isadmavar.h> 61 62 #include <dev/ic/cs89x0reg.h> 63 #include <dev/ic/cs89x0var.h> 64 #include <dev/isa/cs89x0isavar.h> 65 66 #define DMA_STATUS_BITS 0x0007 /* bit masks for checking DMA status */ 67 #define DMA_STATUS_OK 0x0004 68 69 void 70 cs_isa_dma_attach(struct cs_softc *sc) 71 { 72 struct cs_softc_isa *isc = (void *)sc; 73 74 if (isc->sc_drq == ISACF_DRQ_DEFAULT) 75 printf("%s: DMA channel unspecified, not using DMA\n", 76 sc->sc_dev.dv_xname); 77 else if (isc->sc_drq < 5 || isc->sc_drq > 7) 78 printf("%s: invalid DMA channel, not using DMA\n", 79 sc->sc_dev.dv_xname); 80 else { 81 bus_size_t maxsize; 82 bus_addr_t dma_addr; 83 84 maxsize = isa_dmamaxsize(isc->sc_ic, isc->sc_drq); 85 if (maxsize < CS8900_DMASIZE) { 86 printf("%s: max DMA size %lu is less than required %d\n", 87 sc->sc_dev.dv_xname, (u_long)maxsize, 88 CS8900_DMASIZE); 89 goto after_dma_block; 90 } 91 92 if (isa_dmamap_create(isc->sc_ic, isc->sc_drq, 93 CS8900_DMASIZE, BUS_DMA_NOWAIT) != 0) { 94 printf("%s: unable to create ISA DMA map\n", 95 sc->sc_dev.dv_xname); 96 goto after_dma_block; 97 } 98 if (isa_dmamem_alloc(isc->sc_ic, isc->sc_drq, 99 CS8900_DMASIZE, &dma_addr, BUS_DMA_NOWAIT) != 0) { 100 printf("%s: unable to allocate DMA buffer\n", 101 sc->sc_dev.dv_xname); 102 goto after_dma_block; 103 } 104 if (isa_dmamem_map(isc->sc_ic, isc->sc_drq, dma_addr, 105 CS8900_DMASIZE, &isc->sc_dmabase, 106 BUS_DMA_NOWAIT | BUS_DMA_COHERENT /* XXX */ ) != 0) { 107 printf("%s: unable to map DMA buffer\n", 108 sc->sc_dev.dv_xname); 109 isa_dmamem_free(isc->sc_ic, isc->sc_drq, dma_addr, 110 CS8900_DMASIZE); 111 goto after_dma_block; 112 } 113 114 isc->sc_dmasize = CS8900_DMASIZE; 115 sc->sc_cfgflags |= CFGFLG_DMA_MODE; 116 isc->sc_dmaaddr = dma_addr; 117 after_dma_block: 118 ; 119 } 120 } 121 122 void cs_isa_dma_chipinit(struct cs_softc *sc) 123 { 124 struct cs_softc_isa *isc = (void *)sc; 125 126 if (sc->sc_cfgflags & CFGFLG_DMA_MODE) { 127 /* 128 * First we program the DMA controller and ensure the memory 129 * buffer is valid. If it isn't then we just go on without 130 * DMA. 131 */ 132 if (isa_dmastart(isc->sc_ic, isc->sc_drq, isc->sc_dmabase, 133 isc->sc_dmasize, NULL, DMAMODE_READ | DMAMODE_LOOPDEMAND, 134 BUS_DMA_NOWAIT)) { 135 /* XXX XXX XXX */ 136 panic("%s: unable to start DMA\n", sc->sc_dev.dv_xname); 137 } 138 isc->sc_dmacur = isc->sc_dmabase; 139 140 /* interrupt when a DMA'd frame is received */ 141 CS_WRITE_PACKET_PAGE(sc, PKTPG_RX_CFG, 142 RX_CFG_ALL_IE | RX_CFG_RX_DMA_ONLY); 143 144 /* 145 * set the DMA burst bit so we don't tie up the bus for too 146 * long. 147 */ 148 if (isc->sc_dmasize == 16384) { 149 CS_WRITE_PACKET_PAGE(sc, PKTPG_BUS_CTL, 150 ((CS_READ_PACKET_PAGE(sc, PKTPG_BUS_CTL) & 151 ~BUS_CTL_DMA_SIZE) | BUS_CTL_DMA_BURST)); 152 } else { /* use 64K */ 153 CS_WRITE_PACKET_PAGE(sc, PKTPG_BUS_CTL, 154 CS_READ_PACKET_PAGE(sc, PKTPG_BUS_CTL) | 155 BUS_CTL_DMA_SIZE | BUS_CTL_DMA_BURST); 156 } 157 158 CS_WRITE_PACKET_PAGE(sc, PKTPG_DMA_CHANNEL, isc->sc_drq - 5); 159 } 160 } 161 162 void cs_process_rx_dma(struct cs_softc *sc) 163 { 164 struct cs_softc_isa *isc = (void *)sc; 165 struct ifnet *ifp; 166 u_int16_t num_dma_frames; 167 u_int16_t pkt_length; 168 u_int16_t status; 169 u_int to_copy; 170 char *dma_mem_ptr; 171 struct mbuf *m; 172 u_char *pBuff; 173 int pad; 174 175 /* initialise the pointers */ 176 ifp = &sc->sc_ethercom.ec_if; 177 178 /* Read the number of frames DMAed. */ 179 num_dma_frames = CS_READ_PACKET_PAGE(sc, PKTPG_DMA_FRAME_COUNT); 180 num_dma_frames &= (u_int16_t) (0x0fff); 181 182 /* 183 * Loop till number of DMA frames ready to read is zero. After 184 * reading the frame out of memory we must check if any have been 185 * received while we were processing 186 */ 187 while (num_dma_frames != 0) { 188 dma_mem_ptr = isc->sc_dmacur; 189 190 /* 191 * process all of the dma frames in memory 192 * 193 * This loop relies on the dma_mem_ptr variable being set to the 194 * next frames start address. 195 */ 196 for (; num_dma_frames > 0; num_dma_frames--) { 197 198 /* 199 * Get the length and status of the packet. Only the 200 * status is guarenteed to be at dma_mem_ptr, ie need 201 * to check for wraparound before reading the length 202 */ 203 status = *((unsigned short *) dma_mem_ptr)++; 204 if (dma_mem_ptr > (isc->sc_dmabase + isc->sc_dmasize)) { 205 dma_mem_ptr = isc->sc_dmabase; 206 } 207 pkt_length = *((unsigned short *) dma_mem_ptr)++; 208 209 /* Do some sanity checks on the length and status. */ 210 if ((pkt_length > ETHER_MAX_LEN) || 211 ((status & DMA_STATUS_BITS) != DMA_STATUS_OK)) { 212 /* 213 * the SCO driver kills the adapter in this 214 * situation 215 */ 216 /* 217 * should increment the error count and reset 218 * the dma operation. 219 */ 220 printf("%s: cs_process_rx_dma: DMA buffer out of sync about to reset\n", 221 sc->sc_dev.dv_xname); 222 ifp->if_ierrors++; 223 224 /* skip the rest of the DMA buffer */ 225 isa_dmaabort(isc->sc_ic, isc->sc_drq); 226 227 /* now reset the chip and reinitialise */ 228 cs_init(&sc->sc_ethercom.ec_if); 229 return; 230 } 231 /* Check the status of the received packet. */ 232 if (status & RX_EVENT_RX_OK) { 233 /* get a new mbuf */ 234 MGETHDR(m, M_DONTWAIT, MT_DATA); 235 if (m == 0) { 236 printf("%s: cs_process_rx_dma: unable to allocate mbuf\n", 237 sc->sc_dev.dv_xname); 238 ifp->if_ierrors++; 239 /* 240 * couldn't allocate an mbuf so 241 * things are not good, may as well 242 * drop all the packets I think. 243 */ 244 CS_READ_PACKET_PAGE(sc, 245 PKTPG_DMA_FRAME_COUNT); 246 247 /* now reset DMA operation */ 248 isa_dmaabort(isc->sc_ic, isc->sc_drq); 249 250 /* 251 * now reset the chip and 252 * reinitialise 253 */ 254 cs_init(&sc->sc_ethercom.ec_if); 255 return; 256 } 257 /* 258 * save processing by always using a mbuf 259 * cluster, guarenteed to fit packet 260 */ 261 MCLGET(m, M_DONTWAIT); 262 if ((m->m_flags & M_EXT) == 0) { 263 /* couldn't allocate an mbuf cluster */ 264 printf("%s: cs_process_rx_dma: unable to allocate a cluster\n", 265 sc->sc_dev.dv_xname); 266 m_freem(m); 267 268 /* skip the frame */ 269 CS_READ_PACKET_PAGE(sc, PKTPG_DMA_FRAME_COUNT); 270 isa_dmaabort(isc->sc_ic, isc->sc_drq); 271 272 /* 273 * now reset the chip and 274 * reinitialise 275 */ 276 cs_init(&sc->sc_ethercom.ec_if); 277 return; 278 } 279 m->m_pkthdr.rcvif = ifp; 280 m->m_pkthdr.len = pkt_length; 281 m->m_len = pkt_length; 282 283 /* 284 * align ip header on word boundary for 285 * ipintr 286 */ 287 pad = ALIGN(sizeof(struct ether_header)) - 288 sizeof(struct ether_header); 289 m->m_data += pad; 290 291 /* 292 * set up the buffer pointer to point to the 293 * data area 294 */ 295 pBuff = mtod(m, char *); 296 297 /* 298 * Read the frame into free_pktbuf 299 * The buffer is circular buffer, either 300 * 16K or 64K in length. 301 * 302 * need to check where the end of the buffer 303 * is and go back to the start. 304 */ 305 if ((dma_mem_ptr + pkt_length) < 306 (isc->sc_dmabase + isc->sc_dmasize)) { 307 /* 308 * No wrap around. Copy the frame 309 * header 310 */ 311 memcpy(pBuff, dma_mem_ptr, pkt_length); 312 dma_mem_ptr += pkt_length; 313 } else { 314 to_copy = (u_int) 315 ((isc->sc_dmabase + isc->sc_dmasize) - 316 dma_mem_ptr); 317 318 /* Copy the first half of the frame. */ 319 memcpy(pBuff, dma_mem_ptr, to_copy); 320 pBuff += to_copy; 321 322 /* 323 * Rest of the frame is to be read 324 * from the first byte of the DMA 325 * memory. 326 */ 327 /* 328 * Get the number of bytes leftout in 329 * the frame. 330 */ 331 to_copy = pkt_length - to_copy; 332 333 dma_mem_ptr = isc->sc_dmabase; 334 335 /* Copy rest of the frame. */ 336 memcpy(pBuff, dma_mem_ptr, to_copy); 337 dma_mem_ptr += to_copy; 338 } 339 340 cs_ether_input(sc, m); 341 } 342 /* (status & RX_OK) */ 343 else { 344 /* the frame was not received OK */ 345 /* Increment the input error count */ 346 ifp->if_ierrors++; 347 348 /* 349 * If debugging is enabled then log error 350 * messages if we got any. 351 */ 352 if ((ifp->if_flags & IFF_DEBUG) && 353 status != REG_NUM_RX_EVENT) 354 cs_print_rx_errors(sc, status); 355 } 356 /* 357 * now update the current frame pointer. the 358 * dma_mem_ptr should point to the next packet to be 359 * received, without the alignment considerations. 360 * 361 * The cs8900 pads all frames to start at the next 32bit 362 * aligned addres. hence we need to pad our offset 363 * pointer. 364 */ 365 dma_mem_ptr += 3; 366 dma_mem_ptr = (char *) 367 ((long) dma_mem_ptr & 0xfffffffc); 368 if (dma_mem_ptr < (isc->sc_dmabase + isc->sc_dmasize)) { 369 isc->sc_dmacur = dma_mem_ptr; 370 } else { 371 dma_mem_ptr = isc->sc_dmacur = isc->sc_dmabase; 372 } 373 } /* for all frames */ 374 /* Read the number of frames DMAed again. */ 375 num_dma_frames = CS_READ_PACKET_PAGE(sc, PKTPG_DMA_FRAME_COUNT); 376 num_dma_frames &= (u_int16_t) (0x0fff); 377 } /* while there are frames left */ 378 } 379