/netbsd/sys/dev/isa/cs89x0isa.c
C | 378 lines | 192 code | 42 blank | 144 comment | 36 complexity | 76000dcc5bf660fc56c9ca1434c3fc6f MD5 | raw file
Possible License(s): BSD-3-Clause, GPL-2.0
- /* $NetBSD: cs89x0isa.c,v 1.3 2001/12/31 22:07:58 thorpej Exp $ */
- /*
- * Copyright 1997
- * Digital Equipment Corporation. All rights reserved.
- *
- * This software is furnished under license and may be used and
- * copied only in accordance with the following terms and conditions.
- * Subject to these conditions, you may download, copy, install,
- * use, modify and distribute this software in source and/or binary
- * form. No title or ownership is transferred hereby.
- *
- * 1) Any source code used, modified or distributed must reproduce
- * and retain this copyright notice and list of conditions as
- * they appear in the source file.
- *
- * 2) No right is granted to use any trade name, trademark, or logo of
- * Digital Equipment Corporation. Neither the "Digital Equipment
- * Corporation" name nor any trademark or logo of Digital Equipment
- * Corporation may be used to endorse or promote products derived
- * from this software without the prior written permission of
- * Digital Equipment Corporation.
- *
- * 3) This software is provided "AS-IS" and any express or implied
- * warranties, including but not limited to, any implied warranties
- * of merchantability, fitness for a particular purpose, or
- * non-infringement are disclaimed. In no event shall DIGITAL be
- * liable for any damages whatsoever, and in particular, DIGITAL
- * shall not be liable for special, indirect, consequential, or
- * incidental damages or damages for lost profits, loss of
- * revenue or loss of use, whether such damages arise in contract,
- * negligence, tort, under statute, in equity, at law or otherwise,
- * even if advised of the possibility of such damage.
- */
- /* isa dma routines for cs89x0 */
- #include <sys/cdefs.h>
- __KERNEL_RCSID(0, "$NetBSD: cs89x0isa.c,v 1.3 2001/12/31 22:07:58 thorpej Exp $");
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/mbuf.h>
- #include <sys/socket.h>
- #include <sys/device.h>
- #include "rnd.h"
- #if NRND > 0
- #include <sys/rnd.h>
- #endif
- #include <net/if.h>
- #include <net/if_ether.h>
- #include <net/if_media.h>
- #include <machine/bus.h>
- #include <dev/isa/isareg.h>
- #include <dev/isa/isavar.h>
- #include <dev/isa/isadmavar.h>
- #include <dev/ic/cs89x0reg.h>
- #include <dev/ic/cs89x0var.h>
- #include <dev/isa/cs89x0isavar.h>
- #define DMA_STATUS_BITS 0x0007 /* bit masks for checking DMA status */
- #define DMA_STATUS_OK 0x0004
- void
- cs_isa_dma_attach(struct cs_softc *sc)
- {
- struct cs_softc_isa *isc = (void *)sc;
- if (isc->sc_drq == ISACF_DRQ_DEFAULT)
- printf("%s: DMA channel unspecified, not using DMA\n",
- sc->sc_dev.dv_xname);
- else if (isc->sc_drq < 5 || isc->sc_drq > 7)
- printf("%s: invalid DMA channel, not using DMA\n",
- sc->sc_dev.dv_xname);
- else {
- bus_size_t maxsize;
- bus_addr_t dma_addr;
- maxsize = isa_dmamaxsize(isc->sc_ic, isc->sc_drq);
- if (maxsize < CS8900_DMASIZE) {
- printf("%s: max DMA size %lu is less than required %d\n",
- sc->sc_dev.dv_xname, (u_long)maxsize,
- CS8900_DMASIZE);
- goto after_dma_block;
- }
- if (isa_dmamap_create(isc->sc_ic, isc->sc_drq,
- CS8900_DMASIZE, BUS_DMA_NOWAIT) != 0) {
- printf("%s: unable to create ISA DMA map\n",
- sc->sc_dev.dv_xname);
- goto after_dma_block;
- }
- if (isa_dmamem_alloc(isc->sc_ic, isc->sc_drq,
- CS8900_DMASIZE, &dma_addr, BUS_DMA_NOWAIT) != 0) {
- printf("%s: unable to allocate DMA buffer\n",
- sc->sc_dev.dv_xname);
- goto after_dma_block;
- }
- if (isa_dmamem_map(isc->sc_ic, isc->sc_drq, dma_addr,
- CS8900_DMASIZE, &isc->sc_dmabase,
- BUS_DMA_NOWAIT | BUS_DMA_COHERENT /* XXX */ ) != 0) {
- printf("%s: unable to map DMA buffer\n",
- sc->sc_dev.dv_xname);
- isa_dmamem_free(isc->sc_ic, isc->sc_drq, dma_addr,
- CS8900_DMASIZE);
- goto after_dma_block;
- }
- isc->sc_dmasize = CS8900_DMASIZE;
- sc->sc_cfgflags |= CFGFLG_DMA_MODE;
- isc->sc_dmaaddr = dma_addr;
- after_dma_block:
- ;
- }
- }
- void cs_isa_dma_chipinit(struct cs_softc *sc)
- {
- struct cs_softc_isa *isc = (void *)sc;
- if (sc->sc_cfgflags & CFGFLG_DMA_MODE) {
- /*
- * First we program the DMA controller and ensure the memory
- * buffer is valid. If it isn't then we just go on without
- * DMA.
- */
- if (isa_dmastart(isc->sc_ic, isc->sc_drq, isc->sc_dmabase,
- isc->sc_dmasize, NULL, DMAMODE_READ | DMAMODE_LOOPDEMAND,
- BUS_DMA_NOWAIT)) {
- /* XXX XXX XXX */
- panic("%s: unable to start DMA\n", sc->sc_dev.dv_xname);
- }
- isc->sc_dmacur = isc->sc_dmabase;
- /* interrupt when a DMA'd frame is received */
- CS_WRITE_PACKET_PAGE(sc, PKTPG_RX_CFG,
- RX_CFG_ALL_IE | RX_CFG_RX_DMA_ONLY);
- /*
- * set the DMA burst bit so we don't tie up the bus for too
- * long.
- */
- if (isc->sc_dmasize == 16384) {
- CS_WRITE_PACKET_PAGE(sc, PKTPG_BUS_CTL,
- ((CS_READ_PACKET_PAGE(sc, PKTPG_BUS_CTL) &
- ~BUS_CTL_DMA_SIZE) | BUS_CTL_DMA_BURST));
- } else { /* use 64K */
- CS_WRITE_PACKET_PAGE(sc, PKTPG_BUS_CTL,
- CS_READ_PACKET_PAGE(sc, PKTPG_BUS_CTL) |
- BUS_CTL_DMA_SIZE | BUS_CTL_DMA_BURST);
- }
- CS_WRITE_PACKET_PAGE(sc, PKTPG_DMA_CHANNEL, isc->sc_drq - 5);
- }
- }
- void cs_process_rx_dma(struct cs_softc *sc)
- {
- struct cs_softc_isa *isc = (void *)sc;
- struct ifnet *ifp;
- u_int16_t num_dma_frames;
- u_int16_t pkt_length;
- u_int16_t status;
- u_int to_copy;
- char *dma_mem_ptr;
- struct mbuf *m;
- u_char *pBuff;
- int pad;
- /* initialise the pointers */
- ifp = &sc->sc_ethercom.ec_if;
- /* Read the number of frames DMAed. */
- num_dma_frames = CS_READ_PACKET_PAGE(sc, PKTPG_DMA_FRAME_COUNT);
- num_dma_frames &= (u_int16_t) (0x0fff);
- /*
- * Loop till number of DMA frames ready to read is zero. After
- * reading the frame out of memory we must check if any have been
- * received while we were processing
- */
- while (num_dma_frames != 0) {
- dma_mem_ptr = isc->sc_dmacur;
- /*
- * process all of the dma frames in memory
- *
- * This loop relies on the dma_mem_ptr variable being set to the
- * next frames start address.
- */
- for (; num_dma_frames > 0; num_dma_frames--) {
- /*
- * Get the length and status of the packet. Only the
- * status is guarenteed to be at dma_mem_ptr, ie need
- * to check for wraparound before reading the length
- */
- status = *((unsigned short *) dma_mem_ptr)++;
- if (dma_mem_ptr > (isc->sc_dmabase + isc->sc_dmasize)) {
- dma_mem_ptr = isc->sc_dmabase;
- }
- pkt_length = *((unsigned short *) dma_mem_ptr)++;
- /* Do some sanity checks on the length and status. */
- if ((pkt_length > ETHER_MAX_LEN) ||
- ((status & DMA_STATUS_BITS) != DMA_STATUS_OK)) {
- /*
- * the SCO driver kills the adapter in this
- * situation
- */
- /*
- * should increment the error count and reset
- * the dma operation.
- */
- printf("%s: cs_process_rx_dma: DMA buffer out of sync about to reset\n",
- sc->sc_dev.dv_xname);
- ifp->if_ierrors++;
- /* skip the rest of the DMA buffer */
- isa_dmaabort(isc->sc_ic, isc->sc_drq);
- /* now reset the chip and reinitialise */
- cs_init(&sc->sc_ethercom.ec_if);
- return;
- }
- /* Check the status of the received packet. */
- if (status & RX_EVENT_RX_OK) {
- /* get a new mbuf */
- MGETHDR(m, M_DONTWAIT, MT_DATA);
- if (m == 0) {
- printf("%s: cs_process_rx_dma: unable to allocate mbuf\n",
- sc->sc_dev.dv_xname);
- ifp->if_ierrors++;
- /*
- * couldn't allocate an mbuf so
- * things are not good, may as well
- * drop all the packets I think.
- */
- CS_READ_PACKET_PAGE(sc,
- PKTPG_DMA_FRAME_COUNT);
- /* now reset DMA operation */
- isa_dmaabort(isc->sc_ic, isc->sc_drq);
- /*
- * now reset the chip and
- * reinitialise
- */
- cs_init(&sc->sc_ethercom.ec_if);
- return;
- }
- /*
- * save processing by always using a mbuf
- * cluster, guarenteed to fit packet
- */
- MCLGET(m, M_DONTWAIT);
- if ((m->m_flags & M_EXT) == 0) {
- /* couldn't allocate an mbuf cluster */
- printf("%s: cs_process_rx_dma: unable to allocate a cluster\n",
- sc->sc_dev.dv_xname);
- m_freem(m);
- /* skip the frame */
- CS_READ_PACKET_PAGE(sc, PKTPG_DMA_FRAME_COUNT);
- isa_dmaabort(isc->sc_ic, isc->sc_drq);
- /*
- * now reset the chip and
- * reinitialise
- */
- cs_init(&sc->sc_ethercom.ec_if);
- return;
- }
- m->m_pkthdr.rcvif = ifp;
- m->m_pkthdr.len = pkt_length;
- m->m_len = pkt_length;
- /*
- * align ip header on word boundary for
- * ipintr
- */
- pad = ALIGN(sizeof(struct ether_header)) -
- sizeof(struct ether_header);
- m->m_data += pad;
- /*
- * set up the buffer pointer to point to the
- * data area
- */
- pBuff = mtod(m, char *);
- /*
- * Read the frame into free_pktbuf
- * The buffer is circular buffer, either
- * 16K or 64K in length.
- *
- * need to check where the end of the buffer
- * is and go back to the start.
- */
- if ((dma_mem_ptr + pkt_length) <
- (isc->sc_dmabase + isc->sc_dmasize)) {
- /*
- * No wrap around. Copy the frame
- * header
- */
- memcpy(pBuff, dma_mem_ptr, pkt_length);
- dma_mem_ptr += pkt_length;
- } else {
- to_copy = (u_int)
- ((isc->sc_dmabase + isc->sc_dmasize) -
- dma_mem_ptr);
- /* Copy the first half of the frame. */
- memcpy(pBuff, dma_mem_ptr, to_copy);
- pBuff += to_copy;
- /*
- * Rest of the frame is to be read
- * from the first byte of the DMA
- * memory.
- */
- /*
- * Get the number of bytes leftout in
- * the frame.
- */
- to_copy = pkt_length - to_copy;
- dma_mem_ptr = isc->sc_dmabase;
- /* Copy rest of the frame. */
- memcpy(pBuff, dma_mem_ptr, to_copy);
- dma_mem_ptr += to_copy;
- }
- cs_ether_input(sc, m);
- }
- /* (status & RX_OK) */
- else {
- /* the frame was not received OK */
- /* Increment the input error count */
- ifp->if_ierrors++;
- /*
- * If debugging is enabled then log error
- * messages if we got any.
- */
- if ((ifp->if_flags & IFF_DEBUG) &&
- status != REG_NUM_RX_EVENT)
- cs_print_rx_errors(sc, status);
- }
- /*
- * now update the current frame pointer. the
- * dma_mem_ptr should point to the next packet to be
- * received, without the alignment considerations.
- *
- * The cs8900 pads all frames to start at the next 32bit
- * aligned addres. hence we need to pad our offset
- * pointer.
- */
- dma_mem_ptr += 3;
- dma_mem_ptr = (char *)
- ((long) dma_mem_ptr & 0xfffffffc);
- if (dma_mem_ptr < (isc->sc_dmabase + isc->sc_dmasize)) {
- isc->sc_dmacur = dma_mem_ptr;
- } else {
- dma_mem_ptr = isc->sc_dmacur = isc->sc_dmabase;
- }
- } /* for all frames */
- /* Read the number of frames DMAed again. */
- num_dma_frames = CS_READ_PACKET_PAGE(sc, PKTPG_DMA_FRAME_COUNT);
- num_dma_frames &= (u_int16_t) (0x0fff);
- } /* while there are frames left */
- }