/*- * Copyright (c) 1996 Gardner Buchanan * 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 Gardner Buchanan. * 4. The name of Gardner Buchanan may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ #include __FBSDID("$FreeBSD$"); /* * This is a driver for SMC's 9000 series of Ethernet adapters. * * This FreeBSD driver is derived from the smc9194 Linux driver by * Erik Stahlman and is Copyright (C) 1996 by Erik Stahlman. * This driver also shamelessly borrows from the FreeBSD ep driver * which is Copyright (C) 1994 Herb Peyerl * All rights reserved. * * It is set up for my SMC91C92 equipped Ampro LittleBoard embedded * PC. It is adapted from Erik Stahlman's Linux driver which worked * with his EFA Info*Express SVC VLB adaptor. According to SMC's databook, * it will work for the entire SMC 9xxx series. (Ha Ha) * * "Features" of the SMC chip: * 4608 byte packet memory. (for the 91C92. Others have more) * EEPROM for configuration * AUI/TP selection * * Authors: * Erik Stahlman erik@vt.edu * Herb Peyerl hpeyerl@novatel.ca * Andres Vega Garcia avega@sophia.inria.fr * Serge Babkin babkin@hq.icb.chel.su * Gardner Buchanan gbuchanan@shl.com * * Sources: * o SMC databook * o "smc9194.c:v0.10(FIXED) 02/15/96 by Erik Stahlman (erik@vt.edu)" * o "if_ep.c,v 1.19 1995/01/24 20:53:45 davidg Exp" * * Known Bugs: * o Setting of the hardware address isn't supported. * o Hardware padding isn't used. */ /* * Modifications for Megahertz X-Jack Ethernet Card (XJ-10BT) * * Copyright (c) 1996 by Tatsumi Hosokawa * BSD-nomads, Tokyo, Japan. */ /* * Multicast support by Kei TANAKA * Special thanks to itojun@itojun.org */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #endif #include #include #include #include /* Exported variables */ devclass_t sn_devclass; static int snioctl(struct ifnet * ifp, u_long, caddr_t); static void snresume(struct ifnet *); static void snintr_locked(struct sn_softc *); static void sninit_locked(void *); static void snstart_locked(struct ifnet *); static void sninit(void *); static void snread(struct ifnet *); static void snstart(struct ifnet *); static void snstop(struct sn_softc *); static void snwatchdog(void *); static void sn_setmcast(struct sn_softc *); static int sn_getmcf(struct ifnet *ifp, u_char *mcf); /* I (GB) have been unlucky getting the hardware padding * to work properly. */ #define SW_PAD static const char *chip_ids[15] = { NULL, NULL, NULL, /* 3 */ "SMC91C90/91C92", /* 4 */ "SMC91C94/91C96", /* 5 */ "SMC91C95", NULL, /* 7 */ "SMC91C100", /* 8 */ "SMC91C100FD", /* 9 */ "SMC91C110", NULL, NULL, NULL, NULL, NULL }; int sn_attach(device_t dev) { struct sn_softc *sc = device_get_softc(dev); struct ifnet *ifp; uint16_t i; uint8_t *p; int rev; uint16_t address; int err; u_char eaddr[6]; ifp = sc->ifp = if_alloc(IFT_ETHER); if (ifp == NULL) { device_printf(dev, "can not if_alloc()\n"); return (ENOSPC); } SN_LOCK_INIT(sc); callout_init_mtx(&sc->watchdog, &sc->sc_mtx, 0); snstop(sc); sc->pages_wanted = -1; if (bootverbose || 1) { SMC_SELECT_BANK(sc, 3); rev = (CSR_READ_2(sc, REVISION_REG_W) >> 4) & 0xf; if (chip_ids[rev]) device_printf(dev, " %s ", chip_ids[rev]); else device_printf(dev, " unsupported chip: rev %d ", rev); SMC_SELECT_BANK(sc, 1); i = CSR_READ_2(sc, CONFIG_REG_W); printf("%s\n", i & CR_AUI_SELECT ? "AUI" : "UTP"); } /* * Read the station address from the chip. The MAC address is bank 1, * regs 4 - 9 */ SMC_SELECT_BANK(sc, 1); p = (uint8_t *) eaddr; for (i = 0; i < 6; i += 2) { address = CSR_READ_2(sc, IAR_ADDR0_REG_W + i); p[i + 1] = address >> 8; p[i] = address & 0xFF; } ifp->if_softc = sc; if_initname(ifp, device_get_name(dev), device_get_unit(dev)); ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; ifp->if_start = snstart; ifp->if_ioctl = snioctl; ifp->if_init = sninit; ifp->if_baudrate = 10000000; IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); ifp->if_snd.ifq_maxlen = ifqmaxlen; IFQ_SET_READY(&ifp->if_snd); ether_ifattach(ifp, eaddr); /* * Activate the interrupt so we can get card interrupts. This * needs to be done last so that we don't have/hold the lock * during startup to avoid LORs in the network layer. */ if ((err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET | INTR_MPSAFE, NULL, sn_intr, sc, &sc->intrhand)) != 0) { sn_detach(dev); return err; } return 0; } int sn_detach(device_t dev) { struct sn_softc *sc = device_get_softc(dev); struct ifnet *ifp = sc->ifp; ether_ifdetach(ifp); SN_LOCK(sc); snstop(sc); SN_UNLOCK(sc); callout_drain(&sc->watchdog); sn_deactivate(dev); if_free(ifp); SN_LOCK_DESTROY(sc); return 0; } static void sninit(void *xsc) { struct sn_softc *sc = xsc; SN_LOCK(sc); sninit_locked(sc); SN_UNLOCK(sc); } /* * Reset and initialize the chip */ static void sninit_locked(void *xsc) { struct sn_softc *sc = xsc; struct ifnet *ifp = sc->ifp; int flags; int mask; SN_ASSERT_LOCKED(sc); /* * This resets the registers mostly to defaults, but doesn't affect * EEPROM. After the reset cycle, we pause briefly for the chip to * be happy. */ SMC_SELECT_BANK(sc, 0); CSR_WRITE_2(sc, RECV_CONTROL_REG_W, RCR_SOFTRESET); SMC_DELAY(sc); CSR_WRITE_2(sc, RECV_CONTROL_REG_W, 0x0000); SMC_DELAY(sc); SMC_DELAY(sc); CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, 0x0000); /* * Set the control register to automatically release succesfully * transmitted packets (making the best use out of our limited * memory) and to enable the EPH interrupt on certain TX errors. */ SMC_SELECT_BANK(sc, 1); CSR_WRITE_2(sc, CONTROL_REG_W, (CTR_AUTO_RELEASE | CTR_TE_ENABLE | CTR_CR_ENABLE | CTR_LE_ENABLE)); /* Set squelch level to 240mV (default 480mV) */ flags = CSR_READ_2(sc, CONFIG_REG_W); flags |= CR_SET_SQLCH; CSR_WRITE_2(sc, CONFIG_REG_W, flags); /* * Reset the MMU and wait for it to be un-busy. */ SMC_SELECT_BANK(sc, 2); CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_RESET); while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */ ; /* * Disable all interrupts */ CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00); sn_setmcast(sc); /* * Set the transmitter control. We want it enabled. */ flags = TCR_ENABLE; #ifndef SW_PAD /* * I (GB) have been unlucky getting this to work. */ flags |= TCR_PAD_ENABLE; #endif /* SW_PAD */ CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, flags); /* * Now, enable interrupts */ SMC_SELECT_BANK(sc, 2); mask = IM_EPH_INT | IM_RX_OVRN_INT | IM_RCV_INT | IM_TX_INT; CSR_WRITE_1(sc, INTR_MASK_REG_B, mask); sc->intr_mask = mask; sc->pages_wanted = -1; /* * Mark the interface running but not active. */ ifp->if_drv_flags |= IFF_DRV_RUNNING; ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; callout_reset(&sc->watchdog, hz, snwatchdog, sc); /* * Attempt to push out any waiting packets. */ snstart_locked(ifp); } static void snstart(struct ifnet *ifp) { struct sn_softc *sc = ifp->if_softc; SN_LOCK(sc); snstart_locked(ifp); SN_UNLOCK(sc); } static void snstart_locked(struct ifnet *ifp) { struct sn_softc *sc = ifp->if_softc; u_int len; struct mbuf *m; struct mbuf *top; int pad; int mask; uint16_t length; uint16_t numPages; uint8_t packet_no; int time_out; int junk = 0; SN_ASSERT_LOCKED(sc); if (ifp->if_drv_flags & IFF_DRV_OACTIVE) return; if (sc->pages_wanted != -1) { if_printf(ifp, "snstart() while memory allocation pending\n"); return; } startagain: /* * Sneak a peek at the next packet */ m = ifp->if_snd.ifq_head; if (m == 0) return; /* * Compute the frame length and set pad to give an overall even * number of bytes. Below we assume that the packet length is even. */ for (len = 0, top = m; m; m = m->m_next) len += m->m_len; pad = (len & 1); /* * We drop packets that are too large. Perhaps we should truncate * them instead? */ if (len + pad > ETHER_MAX_LEN - ETHER_CRC_LEN) { if_printf(ifp, "large packet discarded (A)\n"); ++ifp->if_oerrors; IFQ_DRV_DEQUEUE(&ifp->if_snd, m); m_freem(m); goto readcheck; } #ifdef SW_PAD /* * If HW padding is not turned on, then pad to ETHER_MIN_LEN. */ if (len < ETHER_MIN_LEN - ETHER_CRC_LEN) pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len; #endif /* SW_PAD */ length = pad + len; /* * The MMU wants the number of pages to be the number of 256 byte * 'pages', minus 1 (A packet can't ever have 0 pages. We also * include space for the status word, byte count and control bytes in * the allocation request. */ numPages = (length + 6) >> 8; /* * Now, try to allocate the memory */ SMC_SELECT_BANK(sc, 2); CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ALLOC | numPages); /* * Wait a short amount of time to see if the allocation request * completes. Otherwise, I enable the interrupt and wait for * completion asynchronously. */ time_out = MEMORY_WAIT_TIME; do { if (CSR_READ_1(sc, INTR_STAT_REG_B) & IM_ALLOC_INT) break; } while (--time_out); if (!time_out || junk > 10) { /* * No memory now. Oh well, wait until the chip finds memory * later. Remember how many pages we were asking for and * enable the allocation completion interrupt. Also set a * watchdog in case we miss the interrupt. We mark the * interface active since there is no point in attempting an * snstart() until after the memory is available. */ mask = CSR_READ_1(sc, INTR_MASK_REG_B) | IM_ALLOC_INT; CSR_WRITE_1(sc, INTR_MASK_REG_B, mask); sc->intr_mask = mask; sc->timer = 1; ifp->if_drv_flags |= IFF_DRV_OACTIVE; sc->pages_wanted = numPages; return; } /* * The memory allocation completed. Check the results. */ packet_no = CSR_READ_1(sc, ALLOC_RESULT_REG_B); if (packet_no & ARR_FAILED) { if (junk++ > 10) if_printf(ifp, "Memory allocation failed\n"); goto startagain; } /* * We have a packet number, so tell the card to use it. */ CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no); /* * Point to the beginning of the packet */ CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | 0x0000); /* * Send the packet length (+6 for status, length and control byte) * and the status word (set to zeros) */ CSR_WRITE_2(sc, DATA_REG_W, 0); CSR_WRITE_1(sc, DATA_REG_B, (length + 6) & 0xFF); CSR_WRITE_1(sc, DATA_REG_B, (length + 6) >> 8); /* * Get the packet from the kernel. This will include the Ethernet * frame header, MAC Addresses etc. */ IFQ_DRV_DEQUEUE(&ifp->if_snd, m); /* * Push out the data to the card. */ for (top = m; m != 0; m = m->m_next) { /* * Push out words. */ CSR_WRITE_MULTI_2(sc, DATA_REG_W, mtod(m, uint16_t *), m->m_len / 2); /* * Push out remaining byte. */ if (m->m_len & 1) CSR_WRITE_1(sc, DATA_REG_B, *(mtod(m, caddr_t) + m->m_len - 1)); } /* * Push out padding. */ while (pad > 1) { CSR_WRITE_2(sc, DATA_REG_W, 0); pad -= 2; } if (pad) CSR_WRITE_1(sc, DATA_REG_B, 0); /* * Push out control byte and unused packet byte The control byte is 0 * meaning the packet is even lengthed and no special CRC handling is * desired. */ CSR_WRITE_2(sc, DATA_REG_W, 0); /* * Enable the interrupts and let the chipset deal with it Also set a * watchdog in case we miss the interrupt. */ mask = CSR_READ_1(sc, INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT); CSR_WRITE_1(sc, INTR_MASK_REG_B, mask); sc->intr_mask = mask; CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ENQUEUE); ifp->if_drv_flags |= IFF_DRV_OACTIVE; sc->timer = 1; BPF_MTAP(ifp, top); ifp->if_opackets++; m_freem(top); readcheck: /* * Is another packet coming in? We don't want to overflow the tiny * RX FIFO. If nothing has arrived then attempt to queue another * transmit packet. */ if (CSR_READ_2(sc, FIFO_PORTS_REG_W) & FIFO_REMPTY) goto startagain; return; } /* Resume a packet transmit operation after a memory allocation * has completed. * * This is basically a hacked up copy of snstart() which handles * a completed memory allocation the same way snstart() does. * It then passes control to snstart to handle any other queued * packets. */ static void snresume(struct ifnet *ifp) { struct sn_softc *sc = ifp->if_softc; u_int len; struct mbuf *m; struct mbuf *top; int pad; int mask; uint16_t length; uint16_t numPages; uint16_t pages_wanted; uint8_t packet_no; if (sc->pages_wanted < 0) return; pages_wanted = sc->pages_wanted; sc->pages_wanted = -1; /* * Sneak a peek at the next packet */ m = ifp->if_snd.ifq_head; if (m == 0) { if_printf(ifp, "snresume() with nothing to send\n"); return; } /* * Compute the frame length and set pad to give an overall even * number of bytes. Below we assume that the packet length is even. */ for (len = 0, top = m; m; m = m->m_next) len += m->m_len; pad = (len & 1); /* * We drop packets that are too large. Perhaps we should truncate * them instead? */ if (len + pad > ETHER_MAX_LEN - ETHER_CRC_LEN) { if_printf(ifp, "large packet discarded (B)\n"); ++ifp->if_oerrors; IFQ_DRV_DEQUEUE(&ifp->if_snd, m); m_freem(m); return; } #ifdef SW_PAD /* * If HW padding is not turned on, then pad to ETHER_MIN_LEN. */ if (len < ETHER_MIN_LEN - ETHER_CRC_LEN) pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len; #endif /* SW_PAD */ length = pad + len; /* * The MMU wants the number of pages to be the number of 256 byte * 'pages', minus 1 (A packet can't ever have 0 pages. We also * include space for the status word, byte count and control bytes in * the allocation request. */ numPages = (length + 6) >> 8; SMC_SELECT_BANK(sc, 2); /* * The memory allocation completed. Check the results. If it failed, * we simply set a watchdog timer and hope for the best. */ packet_no = CSR_READ_1(sc, ALLOC_RESULT_REG_B); if (packet_no & ARR_FAILED) { if_printf(ifp, "Memory allocation failed. Weird.\n"); sc->timer = 1; goto try_start; } /* * We have a packet number, so tell the card to use it. */ CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no); /* * Now, numPages should match the pages_wanted recorded when the * memory allocation was initiated. */ if (pages_wanted != numPages) { if_printf(ifp, "memory allocation wrong size. Weird.\n"); /* * If the allocation was the wrong size we simply release the * memory once it is granted. Wait for the MMU to be un-busy. */ while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */ ; CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_FREEPKT); return; } /* * Point to the beginning of the packet */ CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | 0x0000); /* * Send the packet length (+6 for status, length and control byte) * and the status word (set to zeros) */ CSR_WRITE_2(sc, DATA_REG_W, 0); CSR_WRITE_1(sc, DATA_REG_B, (length + 6) & 0xFF); CSR_WRITE_1(sc, DATA_REG_B, (length + 6) >> 8); /* * Get the packet from the kernel. This will include the Ethernet * frame header, MAC Addresses etc. */ IFQ_DRV_DEQUEUE(&ifp->if_snd, m); /* * Push out the data to the card. */ for (top = m; m != 0; m = m->m_next) { /* * Push out words. */ CSR_WRITE_MULTI_2(sc, DATA_REG_W, mtod(m, uint16_t *), m->m_len / 2); /* * Push out remaining byte. */ if (m->m_len & 1) CSR_WRITE_1(sc, DATA_REG_B, *(mtod(m, caddr_t) + m->m_len - 1)); } /* * Push out padding. */ while (pad > 1) { CSR_WRITE_2(sc, DATA_REG_W, 0); pad -= 2; } if (pad) CSR_WRITE_1(sc, DATA_REG_B, 0); /* * Push out control byte and unused packet byte The control byte is 0 * meaning the packet is even lengthed and no special CRC handling is * desired. */ CSR_WRITE_2(sc, DATA_REG_W, 0); /* * Enable the interrupts and let the chipset deal with it Also set a * watchdog in case we miss the interrupt. */ mask = CSR_READ_1(sc, INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT); CSR_WRITE_1(sc, INTR_MASK_REG_B, mask); sc->intr_mask = mask; CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ENQUEUE); BPF_MTAP(ifp, top); ifp->if_opackets++; m_freem(top); try_start: /* * Now pass control to snstart() to queue any additional packets */ ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; snstart_locked(ifp); /* * We've sent something, so we're active. Set a watchdog in case the * TX_EMPTY interrupt is lost. */ ifp->if_drv_flags |= IFF_DRV_OACTIVE; sc->timer = 1; return; } void sn_intr(void *arg) { struct sn_softc *sc = (struct sn_softc *) arg; SN_LOCK(sc); snintr_locked(sc); SN_UNLOCK(sc); } static void snintr_locked(struct sn_softc *sc) { int status, interrupts; struct ifnet *ifp = sc->ifp; /* * Chip state registers */ uint8_t mask; uint8_t packet_no; uint16_t tx_status; uint16_t card_stats; /* * Clear the watchdog. */ sc->timer = 0; SMC_SELECT_BANK(sc, 2); /* * Obtain the current interrupt mask and clear the hardware mask * while servicing interrupts. */ mask = CSR_READ_1(sc, INTR_MASK_REG_B); CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00); /* * Get the set of interrupts which occurred and eliminate any which * are masked. */ interrupts = CSR_READ_1(sc, INTR_STAT_REG_B); status = interrupts & mask; /* * Now, process each of the interrupt types. */ /* * Receive Overrun. */ if (status & IM_RX_OVRN_INT) { /* * Acknowlege Interrupt */ SMC_SELECT_BANK(sc, 2); CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_RX_OVRN_INT); ++ifp->if_ierrors; } /* * Got a packet. */ if (status & IM_RCV_INT) { int packet_number; SMC_SELECT_BANK(sc, 2); packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W); if (packet_number & FIFO_REMPTY) { /* * we got called , but nothing was on the FIFO */ printf("sn: Receive interrupt with nothing on FIFO\n"); goto out; } snread(ifp); } /* * An on-card memory allocation came through. */ if (status & IM_ALLOC_INT) { /* * Disable this interrupt. */ mask &= ~IM_ALLOC_INT; ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; snresume(ifp); } /* * TX Completion. Handle a transmit error message. This will only be * called when there is an error, because of the AUTO_RELEASE mode. */ if (status & IM_TX_INT) { /* * Acknowlege Interrupt */ SMC_SELECT_BANK(sc, 2); CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_TX_INT); packet_no = CSR_READ_2(sc, FIFO_PORTS_REG_W); packet_no &= FIFO_TX_MASK; /* * select this as the packet to read from */ CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no); /* * Position the pointer to the first word from this packet */ CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | PTR_READ | 0x0000); /* * Fetch the TX status word. The value found here will be a * copy of the EPH_STATUS_REG_W at the time the transmit * failed. */ tx_status = CSR_READ_2(sc, DATA_REG_W); if (tx_status & EPHSR_TX_SUC) { device_printf(sc->dev, "Successful packet caused interrupt\n"); } else { ++ifp->if_oerrors; } if (tx_status & EPHSR_LATCOL) ++ifp->if_collisions; /* * Some of these errors will have disabled transmit. * Re-enable transmit now. */ SMC_SELECT_BANK(sc, 0); #ifdef SW_PAD CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, TCR_ENABLE); #else CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, TCR_ENABLE | TCR_PAD_ENABLE); #endif /* SW_PAD */ /* * kill the failed packet. Wait for the MMU to be un-busy. */ SMC_SELECT_BANK(sc, 2); while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */ ; CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_FREEPKT); /* * Attempt to queue more transmits. */ ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; snstart_locked(ifp); } /* * Transmit underrun. We use this opportunity to update transmit * statistics from the card. */ if (status & IM_TX_EMPTY_INT) { /* * Acknowlege Interrupt */ SMC_SELECT_BANK(sc, 2); CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_TX_EMPTY_INT); /* * Disable this interrupt. */ mask &= ~IM_TX_EMPTY_INT; SMC_SELECT_BANK(sc, 0); card_stats = CSR_READ_2(sc, COUNTER_REG_W); /* * Single collisions */ ifp->if_collisions += card_stats & ECR_COLN_MASK; /* * Multiple collisions */ ifp->if_collisions += (card_stats & ECR_MCOLN_MASK) >> 4; SMC_SELECT_BANK(sc, 2); /* * Attempt to enqueue some more stuff. */ ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; snstart_locked(ifp); } /* * Some other error. Try to fix it by resetting the adapter. */ if (status & IM_EPH_INT) { snstop(sc); sninit_locked(sc); } out: /* * Handled all interrupt sources. */ SMC_SELECT_BANK(sc, 2); /* * Reestablish interrupts from mask which have not been deselected * during this interrupt. Note that the hardware mask, which was set * to 0x00 at the start of this service routine, may have been * updated by one or more of the interrupt handers and we must let * those new interrupts stay enabled here. */ mask |= CSR_READ_1(sc, INTR_MASK_REG_B); CSR_WRITE_1(sc, INTR_MASK_REG_B, mask); sc->intr_mask = mask; } static void snread(struct ifnet *ifp) { struct sn_softc *sc = ifp->if_softc; struct ether_header *eh; struct mbuf *m; short status; int packet_number; uint16_t packet_length; uint8_t *data; SMC_SELECT_BANK(sc, 2); #if 0 packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W); if (packet_number & FIFO_REMPTY) { /* * we got called , but nothing was on the FIFO */ printf("sn: Receive interrupt with nothing on FIFO\n"); return; } #endif read_another: /* * Start reading from the start of the packet. Since PTR_RCV is set, * packet number is found in FIFO_PORTS_REG_W, FIFO_RX_MASK. */ CSR_WRITE_2(sc, POINTER_REG_W, PTR_READ | PTR_RCV | PTR_AUTOINC | 0x0000); /* * First two words are status and packet_length */ status = CSR_READ_2(sc, DATA_REG_W); packet_length = CSR_READ_2(sc, DATA_REG_W) & RLEN_MASK; /* * The packet length contains 3 extra words: status, length, and a * extra word with the control byte. */ packet_length -= 6; /* * Account for receive errors and discard. */ if (status & RS_ERRORS) { ++ifp->if_ierrors; goto out; } /* * A packet is received. */ /* * Adjust for odd-length packet. */ if (status & RS_ODDFRAME) packet_length++; /* * Allocate a header mbuf from the kernel. */ MGETHDR(m, M_NOWAIT, MT_DATA); if (m == NULL) goto out; m->m_pkthdr.rcvif = ifp; m->m_pkthdr.len = m->m_len = packet_length; /* * Attach an mbuf cluster */ MCLGET(m, M_NOWAIT); /* * Insist on getting a cluster */ if ((m->m_flags & M_EXT) == 0) { m_freem(m); ++ifp->if_ierrors; printf("sn: snread() kernel memory allocation problem\n"); goto out; } eh = mtod(m, struct ether_header *); /* * Get packet, including link layer address, from interface. */ data = (uint8_t *) eh; CSR_READ_MULTI_2(sc, DATA_REG_W, (uint16_t *) data, packet_length >> 1); if (packet_length & 1) { data += packet_length & ~1; *data = CSR_READ_1(sc, DATA_REG_B); } ++ifp->if_ipackets; /* * Remove link layer addresses and whatnot. */ m->m_pkthdr.len = m->m_len = packet_length; /* * Drop locks before calling if_input() since it may re-enter * snstart() in the netisr case. This would result in a * lock reversal. Better performance might be obtained by * chaining all packets received, dropping the lock, and then * calling if_input() on each one. */ SN_UNLOCK(sc); (*ifp->if_input)(ifp, m); SN_LOCK(sc); out: /* * Error or good, tell the card to get rid of this packet Wait for * the MMU to be un-busy. */ SMC_SELECT_BANK(sc, 2); while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */ ; CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_RELEASE); /* * Check whether another packet is ready */ packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W); if (packet_number & FIFO_REMPTY) { return; } goto read_another; } /* * Handle IOCTLS. This function is completely stolen from if_ep.c * As with its progenitor, it does not handle hardware address * changes. */ static int snioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { struct sn_softc *sc = ifp->if_softc; int error = 0; switch (cmd) { case SIOCSIFFLAGS: SN_LOCK(sc); if ((ifp->if_flags & IFF_UP) == 0 && ifp->if_drv_flags & IFF_DRV_RUNNING) { snstop(sc); } else { /* reinitialize card on any parameter change */ sninit_locked(sc); } SN_UNLOCK(sc); break; case SIOCADDMULTI: case SIOCDELMULTI: /* update multicast filter list. */ SN_LOCK(sc); sn_setmcast(sc); error = 0; SN_UNLOCK(sc); break; default: error = ether_ioctl(ifp, cmd, data); break; } return (error); } static void snwatchdog(void *arg) { struct sn_softc *sc; sc = arg; SN_ASSERT_LOCKED(sc); callout_reset(&sc->watchdog, hz, snwatchdog, sc); if (sc->timer == 0 || --sc->timer > 0) return; snintr_locked(sc); } /* 1. zero the interrupt mask * 2. clear the enable receive flag * 3. clear the enable xmit flags */ static void snstop(struct sn_softc *sc) { struct ifnet *ifp = sc->ifp; /* * Clear interrupt mask; disable all interrupts. */ SMC_SELECT_BANK(sc, 2); CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00); /* * Disable transmitter and Receiver */ SMC_SELECT_BANK(sc, 0); CSR_WRITE_2(sc, RECV_CONTROL_REG_W, 0x0000); CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, 0x0000); /* * Cancel watchdog. */ sc->timer = 0; callout_stop(&sc->watchdog); ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); } int sn_activate(device_t dev) { struct sn_softc *sc = device_get_softc(dev); sc->port_rid = 0; sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->port_rid, 0, ~0, SMC_IO_EXTENT, RF_ACTIVE); if (!sc->port_res) { if (bootverbose) device_printf(dev, "Cannot allocate ioport\n"); return ENOMEM; } sc->irq_rid = 0; sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irq_rid, RF_ACTIVE); if (!sc->irq_res) { if (bootverbose) device_printf(dev, "Cannot allocate irq\n"); sn_deactivate(dev); return ENOMEM; } return (0); } void sn_deactivate(device_t dev) { struct sn_softc *sc = device_get_softc(dev); if (sc->intrhand) bus_teardown_intr(dev, sc->irq_res, sc->intrhand); sc->intrhand = 0; if (sc->port_res) bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid, sc->port_res); sc->port_res = 0; if (sc->modem_res) bus_release_resource(dev, SYS_RES_IOPORT, sc->modem_rid, sc->modem_res); sc->modem_res = 0; if (sc->irq_res) bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, sc->irq_res); sc->irq_res = 0; return; } /* * Function: sn_probe(device_t dev) * * Purpose: * Tests to see if a given ioaddr points to an SMC9xxx chip. * Tries to cause as little damage as possible if it's not a SMC chip. * Returns a 0 on success * * Algorithm: * (1) see if the high byte of BANK_SELECT is 0x33 * (2) compare the ioaddr with the base register's address * (3) see if I recognize the chip ID in the appropriate register * * */ int sn_probe(device_t dev) { struct sn_softc *sc = device_get_softc(dev); uint16_t bank; uint16_t revision_register; uint16_t base_address_register; int err; if ((err = sn_activate(dev)) != 0) return err; /* * First, see if the high byte is 0x33 */ bank = CSR_READ_2(sc, BANK_SELECT_REG_W); if ((bank & BSR_DETECT_MASK) != BSR_DETECT_VALUE) { #ifdef SN_DEBUG device_printf(dev, "test1 failed\n"); #endif goto error; } /* * The above MIGHT indicate a device, but I need to write to further * test this. Go to bank 0, then test that the register still * reports the high byte is 0x33. */ CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x0000); bank = CSR_READ_2(sc, BANK_SELECT_REG_W); if ((bank & BSR_DETECT_MASK) != BSR_DETECT_VALUE) { #ifdef SN_DEBUG device_printf(dev, "test2 failed\n"); #endif goto error; } /* * well, we've already written once, so hopefully another time won't * hurt. This time, I need to switch the bank register to bank 1, so * I can access the base address register. The contents of the * BASE_ADDR_REG_W register, after some jiggery pokery, is expected * to match the I/O port address where the adapter is being probed. */ CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x0001); base_address_register = (CSR_READ_2(sc, BASE_ADDR_REG_W) >> 3) & 0x3e0; if (rman_get_start(sc->port_res) != base_address_register) { /* * Well, the base address register didn't match. Must not * have been a SMC chip after all. */ #ifdef SN_DEBUG device_printf(dev, "test3 failed ioaddr = 0x%x, " "base_address_register = 0x%x\n", rman_get_start(sc->port_res), base_address_register); #endif goto error; } /* * Check if the revision register is something that I recognize. * These might need to be added to later, as future revisions could * be added. */ CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x3); revision_register = CSR_READ_2(sc, REVISION_REG_W); if (!chip_ids[(revision_register >> 4) & 0xF]) { /* * I don't regonize this chip, so... */ #ifdef SN_DEBUG device_printf(dev, "test4 failed\n"); #endif goto error; } /* * at this point I'll assume that the chip is an SMC9xxx. It might be * prudent to check a listing of MAC addresses against the hardware * address, or do some other tests. */ sn_deactivate(dev); return 0; error: sn_deactivate(dev); return ENXIO; } #define MCFSZ 8 static void sn_setmcast(struct sn_softc *sc) { struct ifnet *ifp = sc->ifp; int flags; uint8_t mcf[MCFSZ]; SN_ASSERT_LOCKED(sc); /* * Set the receiver filter. We want receive enabled and auto strip * of CRC from received packet. If we are promiscuous then set that * bit too. */ flags = RCR_ENABLE | RCR_STRIP_CRC; if (ifp->if_flags & IFF_PROMISC) { flags |= RCR_PROMISC | RCR_ALMUL; } else if (ifp->if_flags & IFF_ALLMULTI) { flags |= RCR_ALMUL; } else { if (sn_getmcf(ifp, mcf)) { /* set filter */ SMC_SELECT_BANK(sc, 3); CSR_WRITE_2(sc, MULTICAST1_REG_W, ((uint16_t)mcf[1] << 8) | mcf[0]); CSR_WRITE_2(sc, MULTICAST2_REG_W, ((uint16_t)mcf[3] << 8) | mcf[2]); CSR_WRITE_2(sc, MULTICAST3_REG_W, ((uint16_t)mcf[5] << 8) | mcf[4]); CSR_WRITE_2(sc, MULTICAST4_REG_W, ((uint16_t)mcf[7] << 8) | mcf[6]); } else { flags |= RCR_ALMUL; } } SMC_SELECT_BANK(sc, 0); CSR_WRITE_2(sc, RECV_CONTROL_REG_W, flags); } static int sn_getmcf(struct ifnet *ifp, uint8_t *mcf) { int i; uint32_t index, index2; uint8_t *af = mcf; struct ifmultiaddr *ifma; bzero(mcf, MCFSZ); if_maddr_rlock(ifp); TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { if (ifma->ifma_addr->sa_family != AF_LINK) { if_maddr_runlock(ifp); return 0; } index = ether_crc32_le(LLADDR((struct sockaddr_dl *) ifma->ifma_addr), ETHER_ADDR_LEN) & 0x3f; index2 = 0; for (i = 0; i < 6; i++) { index2 <<= 1; index2 |= (index & 0x01); index >>= 1; } af[index2 >> 3] |= 1 << (index2 & 7); } if_maddr_runlock(ifp); return 1; /* use multicast filter */ }