Fix up the RealTek 8139 driver to work on FreeBSD/alpha. This involves a
few changes: - there was a bug in rl_list_tx_init(): it was calculating the registers to initialize incorrectly. Not a problem on the x86 where unaligned access are allowed, but a problem on the alpha. - set rl_btag accordingly depending on the machine type - rl_rxeof() needs to be sure to longword-align the packet data. This is a little tricky since we copy the data out of the receive buffer using m_devget(), however there's no way to tell m_devget() to fill in the mbufs starting at a particular offset. To get around this, we tell m_devget to copy bytes+2 bytes starting at offset offset-2. This results in the proper alignment, and we can trim off the two leading bytes afterwards with m_adj(). We also allocate some extra space before the start of the receive buffer so that we don't get into trouble in the case where offset == 0. - redefine vtophys() in if_rlreg.h for the alpha. Making this chipset work on the alpha is sort of the inverse of putting a jet engine on a rowboat (putting a propeller on a 747?) but when you can get these things for $5 a pop, it's hard to stop people from buying them.
This commit is contained in:
Bill Paul
parent
6003dc8e9b
commit
19e7516669
@ -29,7 +29,7 @@
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: if_rl.c,v 1.15 1999/05/09 17:06:58 peter Exp $
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* $Id: if_rl.c,v 1.32 1999/06/19 20:01:32 wpaul Exp wpaul $
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*/
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/*
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@ -127,7 +127,7 @@
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#ifndef lint
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static const char rcsid[] =
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"$Id: if_rl.c,v 1.15 1999/05/09 17:06:58 peter Exp $";
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"$Id: if_rl.c,v 1.32 1999/06/19 20:01:32 wpaul Exp wpaul $";
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#endif
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/*
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@ -1080,7 +1080,12 @@ rl_attach(config_id, unit)
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printf ("rl%d: couldn't map ports\n", unit);
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goto fail;
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}
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#ifdef __i386__
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sc->rl_btag = I386_BUS_SPACE_IO;
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#endif
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#ifdef __alpha__
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sc->rl_btag = ALPHA_BUS_SPACE_IO;
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#endif
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#else
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if (!(command & PCIM_CMD_MEMEN)) {
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printf("rl%d: failed to enable memory mapping!\n", unit);
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@ -1091,7 +1096,12 @@ rl_attach(config_id, unit)
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printf ("rl%d: couldn't map memory\n", unit);
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goto fail;
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}
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#ifdef __i386__
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sc->rl_btag = I386_BUS_SPACE_MEM;
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#endif
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#ifdef __alpha__
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sc->rl_btag = ALPHA_BUS_SPACE_MEM;
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#endif
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sc->rl_bhandle = vbase;
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#endif
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@ -1135,7 +1145,7 @@ rl_attach(config_id, unit)
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goto fail;
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}
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sc->rl_cdata.rl_rx_buf = contigmalloc(RL_RXBUFLEN + 16, M_DEVBUF,
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sc->rl_cdata.rl_rx_buf = contigmalloc(RL_RXBUFLEN + 32, M_DEVBUF,
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M_NOWAIT, 0x100000, 0xffffffff, PAGE_SIZE, 0);
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if (sc->rl_cdata.rl_rx_buf == NULL) {
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@ -1144,6 +1154,10 @@ rl_attach(config_id, unit)
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goto fail;
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}
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/* Leave a few bytes before the start of the RX ring buffer. */
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sc->rl_cdata.rl_rx_buf_ptr = sc->rl_cdata.rl_rx_buf;
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sc->rl_cdata.rl_rx_buf += sizeof(u_int64_t);
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ifp = &sc->arpcom.ac_if;
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ifp->if_softc = sc;
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ifp->if_unit = unit;
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@ -1242,7 +1256,8 @@ static int rl_list_tx_init(sc)
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cd = &sc->rl_cdata;
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for (i = 0; i < RL_TX_LIST_CNT; i++) {
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cd->rl_tx_chain[i] = NULL;
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CSR_WRITE_4(sc, RL_TXADDR0 + i, 0x0000000);
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CSR_WRITE_4(sc,
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RL_TXADDR0 + (i * sizeof(u_int32_t)), 0x0000000);
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}
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sc->rl_cdata.cur_tx = 0;
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@ -1267,6 +1282,16 @@ static int rl_list_tx_init(sc)
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* the status word) is also 32-bit aligned. The frame length is in the
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* first 16 bits of the status word; the lower 15 bits correspond with
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* the 'rx status register' mentioned in the datasheet.
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*
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* Note: to make the Alpha happy, the frame payload needs to be aligned
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* on a 32-bit boundary. To achieve this, we cheat a bit by copying from
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* the ring buffer starting at an address two bytes before the actual
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* data location. We can then shave off the first two bytes using m_adj().
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* The reason we do this is because m_devget() doesn't let us specify an
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* offset into the mbuf storage space, so we have to artificially create
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* one. The ring is allocated in such a way that there are a few unused
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* bytes of space preceecing it so that it will be safe for us to do the
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* 2-byte backstep even if reading from the ring at offset 0.
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*/
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static void rl_rxeof(sc)
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struct rl_softc *sc;
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@ -1355,23 +1380,28 @@ static void rl_rxeof(sc)
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wrap = (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN) - rxbufpos;
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if (total_len > wrap) {
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m = m_devget(rxbufpos, wrap, 0, ifp, NULL);
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m = m_devget(rxbufpos - RL_ETHER_ALIGN,
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wrap + RL_ETHER_ALIGN, 0, ifp, NULL);
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if (m == NULL) {
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ifp->if_ierrors++;
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printf("rl%d: out of mbufs, tried to "
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"copy %d bytes\n", sc->rl_unit, wrap);
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}
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else
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else {
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m_adj(m, RL_ETHER_ALIGN);
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m_copyback(m, wrap, total_len - wrap,
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sc->rl_cdata.rl_rx_buf);
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}
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cur_rx = (total_len - wrap + ETHER_CRC_LEN);
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} else {
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m = m_devget(rxbufpos, total_len, 0, ifp, NULL);
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m = m_devget(rxbufpos - RL_ETHER_ALIGN,
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total_len + RL_ETHER_ALIGN, 0, ifp, NULL);
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if (m == NULL) {
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ifp->if_ierrors++;
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printf("rl%d: out of mbufs, tried to "
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"copy %d bytes\n", sc->rl_unit, total_len);
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}
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} else
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m_adj(m, RL_ETHER_ALIGN);
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cur_rx += total_len + 4 + ETHER_CRC_LEN;
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}
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@ -29,7 +29,7 @@
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: if_rlreg.h,v 1.18 1999/05/30 18:48:01 wpaul Exp $
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* $Id: if_rlreg.h,v 1.19 1999/06/19 20:01:32 wpaul Exp wpaul $
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*/
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/*
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@ -307,9 +307,12 @@
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#define RL_RXCFG_CONFIG (RL_RX_FIFOTHRESH|RL_RX_MAXDMA|RL_RX_BUF_SZ)
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#define RL_TXCFG_CONFIG (RL_TXCFG_IFG|RL_TX_MAXDMA)
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#define RL_ETHER_ALIGN 2
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struct rl_chain_data {
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u_int16_t cur_rx;
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caddr_t rl_rx_buf;
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caddr_t rl_rx_buf_ptr;
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struct mbuf *rl_tx_chain[RL_TX_LIST_CNT];
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u_int8_t last_tx;
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@ -608,3 +611,8 @@ struct rl_softc {
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#define PHY_BMSR_LINKSTAT 0x0004
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#define PHY_BMSR_JABBER 0x0002
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#define PHY_BMSR_EXTENDED 0x0001
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#ifdef __alpha__
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#undef vtophys
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#define vtophys(va) alpha_XXX_dmamap((vm_offset_t)va)
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#endif
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