[src/trunk]: src/sys/dev/qbus Back from the dead, but now changed to use the ...

[ragge <ragge%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/75dacaf4961b
branches:  trunk
changeset: 509511:75dacaf4961b
user:      ragge <ragge%NetBSD.org@localhost>
date:      Sun May 06 15:21:44 2001 +0000

description:
Back from the dead, but now changed to use the bus_dma interface.
Still to do:
        - ubaresets
        - BDP handling

diffstat:

 sys/dev/qbus/if_uba.c |  263 ++++++++++++++++++++++++++++++++++++++++++++++++++
 sys/dev/qbus/if_uba.h |  138 ++++++++++++++++++++++++++
 2 files changed, 401 insertions(+), 0 deletions(-)

diffs (truncated from 409 to 300 lines):

diff -r 9bda67212c46 -r 75dacaf4961b sys/dev/qbus/if_uba.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/qbus/if_uba.c     Sun May 06 15:21:44 2001 +0000
@@ -0,0 +1,263 @@
+/*     $NetBSD: if_uba.c,v 1.19 2001/05/06 15:21:44 ragge Exp $        */
+
+/*
+ * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *     @(#)if_uba.c    7.16 (Berkeley) 12/16/90
+ */
+
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/device.h>
+
+#include <net/if.h>
+
+#include <machine/bus.h>
+
+#include <dev/qbus/if_uba.h>
+#include <dev/qbus/ubareg.h>
+#include <dev/qbus/ubavar.h>
+
+static struct mbuf *getmcl(void);
+
+/*
+ * Routines supporting UNIBUS network interfaces.
+ *
+ * TODO:
+ *     Support interfaces using only one BDP statically.
+ */
+
+/*
+ * Init UNIBUS for interface whose headers of size hlen are to
+ * end on a page boundary.  We allocate a UNIBUS map register for the page
+ * with the header, and nmr more UNIBUS map registers for i/o on the adapter,
+ * doing this once for each read and once for each write buffer.  We also
+ * allocate page frames in the mbuffer pool for these pages.
+ *
+ * Recent changes:
+ *     No special "header pages" anymore.
+ *     Recv packets are always put in clusters.
+ *     "size" is the maximum buffer size, may not be bigger than MCLBYTES.
+ */
+int
+if_ubaminit(struct ifubinfo *ifu, struct uba_softc *uh, int size,
+    struct ifrw *ifr, int nr, struct ifxmt *ifw, int nw)
+{
+       struct mbuf *m;
+       int totsz, i, error, rseg, nm = nr;
+       bus_dma_segment_t seg;
+       caddr_t vaddr;
+
+#ifdef DIAGNOSTIC
+       if (size > MCLBYTES)
+               panic("if_ubaminit: size > MCLBYTES");
+#endif
+       ifu->iff_softc = uh;
+       /*
+        * Get DMA memory for transmit buffers.
+        * Buffer size are rounded up to a multiple of the uba page size,
+        * then allocated contiguous.
+        */
+       size = (size + UBA_PGOFSET) & ~UBA_PGOFSET;
+       totsz = size * nw;
+       if ((error = bus_dmamem_alloc(uh->uh_dmat, totsz, NBPG, 0,
+           &seg, 1, &rseg, BUS_DMA_NOWAIT)))
+               return error;
+       if ((error = bus_dmamem_map(uh->uh_dmat, &seg, rseg, totsz, &vaddr,
+           BUS_DMA_NOWAIT|BUS_DMA_COHERENT))) {
+               bus_dmamem_free(uh->uh_dmat, &seg, rseg);
+               return error;
+       }
+
+       /*
+        * Create receive and transmit maps.
+        * Alloc all resources now so we won't fail in the future.
+        */
+
+       for (i = 0; i < nr; i++) {
+               if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
+                   size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
+                   &ifr[i].ifrw_map))) {
+                       nr = i;
+                       nm = nw = 0;
+                       goto bad;
+               }
+       }
+       for (i = 0; i < nw; i++) {
+               if ((error = bus_dmamap_create(uh->uh_dmat, size, 1,
+                   size, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
+                   &ifw[i].ifw_map))) {
+                       nw = i;
+                       nm = 0;
+                       goto bad;
+               }
+       }
+       /*
+        * Preload the rx maps with mbuf clusters.
+        */
+       for (i = 0; i < nm; i++) {
+               if ((m = getmcl()) == NULL) {
+                       nm = i;
+                       goto bad;
+               }
+               ifr[i].ifrw_mbuf = m;
+               bus_dmamap_load(uh->uh_dmat, ifr[i].ifrw_map,
+                   m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_NOWAIT);
+               
+       }
+       /*
+        * Load the tx maps with DMA memory (common case).
+        */
+       for (i = 0; i < nw; i++) {
+               ifw[i].ifw_vaddr = vaddr + size * i;
+               ifw[i].ifw_size = size;
+               bus_dmamap_load(uh->uh_dmat, ifw[i].ifw_map, 
+                   ifw[i].ifw_vaddr, ifw[i].ifw_size, NULL, BUS_DMA_NOWAIT);
+       }
+       return 0;
+bad:
+       while (--nm >= 0) {
+               bus_dmamap_unload(uh->uh_dmat, ifr[nw].ifrw_map);
+               m_freem(ifr[nm].ifrw_mbuf);
+       }
+       while (--nw >= 0)
+               bus_dmamap_destroy(uh->uh_dmat, ifw[nw].ifw_map);
+       while (--nr >= 0)
+               bus_dmamap_destroy(uh->uh_dmat, ifr[nw].ifrw_map);
+       return (0);
+}
+
+struct mbuf *
+getmcl()
+{
+       struct mbuf *m;
+
+       MGETHDR(m, M_DONTWAIT, MT_DATA);
+       if (m == NULL)
+               return 0;
+       MCLGET(m, M_DONTWAIT);
+       if ((m->m_flags & M_EXT) == 0) {
+               m_freem(m);
+               return 0;
+       }
+       return m;
+}
+
+/*
+ * Pull read data off a interface.
+ * Totlen is length of data, with local net header stripped.
+ * When full cluster sized units are present
+ * on the interface on cluster boundaries we can get them more
+ * easily by remapping, and take advantage of this here.
+ * Save a pointer to the interface structure and the total length,
+ * so that protocols can determine where incoming packets arrived.
+ * Note: we may be called to receive from a transmit buffer by some
+ * devices.  In that case, we must force normal mapping of the buffer,
+ * so that the correct data will appear (only unibus maps are 
+ * changed when remapping the transmit buffers).
+ */
+struct mbuf *
+if_ubaget(struct ifubinfo *ifu, struct ifrw *ifr, struct ifnet *ifp, int len)
+{
+       struct uba_softc *uh = ifu->iff_softc;
+       struct mbuf *m, *mn;
+
+       if ((mn = getmcl()) == NULL)
+               return NULL;    /* Leave the old */
+
+       bus_dmamap_unload(uh->uh_dmat, ifr->ifrw_map);
+       m = ifr->ifrw_mbuf;
+       ifr->ifrw_mbuf = mn;
+       if ((bus_dmamap_load(uh->uh_dmat, ifr->ifrw_map,
+           mn->m_ext.ext_buf, mn->m_ext.ext_size, NULL, BUS_DMA_NOWAIT)))
+               panic("if_ubaget"); /* Cannot happen */
+       m->m_pkthdr.rcvif = ifp;
+       m->m_len = m->m_pkthdr.len = len;
+       return m;
+}
+
+/*
+ * Called after a packet is sent. Releases hold resources.
+ */
+void
+if_ubaend(struct ifubinfo *ifu, struct ifxmt *ifw)
+{
+       struct uba_softc *uh = ifu->iff_softc;
+
+       if (ifw->ifw_flags & IFRW_MBUF) {
+               bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
+               m_freem(ifw->ifw_mbuf);
+               ifw->ifw_mbuf = NULL;
+       }
+}
+
+/*
+ * Map a chain of mbufs onto a network interface
+ * in preparation for an i/o operation.
+ * The argument chain of mbufs includes the local network
+ * header which is copied to be in the mapped, aligned
+ * i/o space.
+ */
+int
+if_ubaput(struct ifubinfo *ifu, struct ifxmt *ifw, struct mbuf *m)
+{
+       struct uba_softc *uh = ifu->iff_softc;
+       int len;
+
+       if (/* m->m_next ==*/ 0) {
+               /*
+                * Map the outgoing packet directly.
+                */
+               if ((ifw->ifw_flags & IFRW_MBUF) == 0) {
+                       bus_dmamap_unload(uh->uh_dmat, ifw->ifw_map);
+                       ifw->ifw_flags |= IFRW_MBUF;
+               }
+               bus_dmamap_load(uh->uh_dmat, ifw->ifw_map, mtod(m, void *),
+                   m->m_len, NULL, BUS_DMA_NOWAIT);
+               ifw->ifw_mbuf = m;
+               len = m->m_len;
+       } else {
+               if (ifw->ifw_flags & IFRW_MBUF) {
+                       bus_dmamap_load(uh->uh_dmat, ifw->ifw_map,
+                           ifw->ifw_vaddr, ifw->ifw_size,NULL,BUS_DMA_NOWAIT);
+                       ifw->ifw_flags &= ~IFRW_MBUF;
+               }
+               len = m->m_pkthdr.len;
+               m_copydata(m, 0, m->m_pkthdr.len, ifw->ifw_vaddr);
+               m_freem(m);
+       }
+       return len;
+}
diff -r 9bda67212c46 -r 75dacaf4961b sys/dev/qbus/if_uba.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/qbus/if_uba.h     Sun May 06 15:21:44 2001 +0000
@@ -0,0 +1,138 @@
+/*     $NetBSD: if_uba.h,v 1.9 2001/05/06 15:21:44 ragge Exp $ */
+
+/*
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)