A PCMCIA ethernet driver for Asix AX88190-based cards
The Asix AX88190 is a NS8390-derived chipset with a few nasty idiosyncracies that make it very inconvenient to support with a standard 8390 driver. This driver is based on pcnet_cs, with the tweaked 8390 code grafted on the end. Much of what I did was to clean up and update a similar driver supplied by Asix, which was adapted by William Lee, william@asix.com.tw.
Copyright (C) 2001 David A. Hinds -- dahinds@users.sourceforge.net
axnet_cs.c 1.28 2002/06/29 06:27:37
The network driver code is based on Donald Becker's NE2000 code:
Written 1992,1993 by Donald Becker. Copyright 1993 United States Government as represented by the Director, National Security Agency. Donald Becker may be reached at becker@scyld.com
#define AXNET_CMD 0x00 #define AXNET_DATAPORT 0x10 /* NatSemi-defined port window offset. */ #define AXNET_RESET 0x1f /* Issue a read to reset, a write to clear. */ #define AXNET_MII_EEP 0x14 /* Offset of MII access port */ #define AXNET_TEST 0x15 /* Offset of TEST Register port */ #define AXNET_GPIO 0x17 /* Offset of General Purpose Register Port */
#define AXNET_START_PG 0x40 /* First page of TX buffer */ #define AXNET_STOP_PG 0x80 /* Last page +1 of RX ring */
#define AXNET_RDC_TIMEOUT 0x02 /* Max wait in jiffies for Tx RDC */
for (i = 0; i < 32; i++) {
j = mdio_read(dev->base_addr + AXNET_MII_EEP, i, 1);
j2 = mdio_read(dev->base_addr + AXNET_MII_EEP, i, 2); if (j == j2) continue; if ((j != 0) && (j != 0xffff)) break;
}
if (i == 32) { /* Maybe PHY is in power down mode. (PPD_SET = 1)
Bit 2 of CCSR is active low. */
pcmcia_write_config_byte(link, CISREG_CCSR, 0x04); for (i = 0; i < 32; i++) {
j = mdio_read(dev->base_addr + AXNET_MII_EEP, i, 1);
j2 = mdio_read(dev->base_addr + AXNET_MII_EEP, i, 2); if (j == j2) continue; if ((j != 0) && (j != 0xffff)) {
info->active_low = 1; break;
}
}
}
info->phy_id = (i < 32) ? i : -1;
SET_NETDEV_DEV(dev, &link->dev);
if (register_netdev(dev) != 0) {
pr_notice("register_netdev() failed\n"); goto failed;
}
netdev_info(dev, "Asix AX88%d90: io %#3lx, irq %d, hw_addr %pM\n",
((info->flags & IS_AX88790) ? 7 : 1),
dev->base_addr, dev->irq, dev->dev_addr); if (info->phy_id != -1) {
netdev_dbg(dev, " MII transceiver at index %d, status %x\n",
info->phy_id, j);
} else {
netdev_notice(dev, " No MII transceivers found!\n");
} return 0;
/* Check for pending interrupt with expired latency timer: with
this, we can limp along even if the interrupt is blocked */ if (info->stale++ && (inb_p(nic_base + EN0_ISR) & ENISR_ALL)) { if (!info->fast_poll)
netdev_info(dev, "interrupt(s) dropped!\n");
ei_irq_wrapper(dev->irq, dev);
info->fast_poll = HZ;
} if (info->fast_poll) {
info->fast_poll--;
info->watchdog.expires = jiffies + 1;
add_timer(&info->watchdog); return;
}
if (info->phy_id < 0) goto reschedule;
link = mdio_read(mii_addr, info->phy_id, 1); if (!link || (link == 0xffff)) {
netdev_info(dev, "MII is missing!\n");
info->phy_id = -1; goto reschedule;
}
link &= 0x0004; if (link != info->link_status) {
u_short p = mdio_read(mii_addr, info->phy_id, 5);
netdev_info(dev, "%s link beat\n", link ? "found" : "lost"); if (link) {
info->duplex_flag = (p & 0x0140) ? 0x80 : 0x00; if (p)
netdev_info(dev, "autonegotiation complete: %dbaseT-%cD selected\n",
(p & 0x0180) ? 100 : 10, (p & 0x0140) ? 'F' : 'H'); else
netdev_info(dev, "link partner did not autonegotiate\n");
AX88190_init(dev, 1);
}
info->link_status = link;
}
/* Round the count up for word writes. Do we need to do this? What effect will an odd byte count have on the 8390?
I should check someday. */ if (count & 0x01)
count++;
/* 8390.c: A general NS8390 ethernet driver core for linux. */ /* Written 1992-94 by Donald Becker. Copyright 1993 United States Government as represented by the Director, National Security Agency.
This software may be used and distributed according to the terms of the GNU General Public License, incorporated herein by reference.
The author may be reached as becker@scyld.com, or C/O Scyld Computing Corporation 410 Severn Ave., Suite 210 Annapolis MD 21403
This is the chip-specific code for many 8390-based ethernet adaptors. This is not a complete driver, it must be combined with board-specific code such as ne.c, wd.c, 3c503.c, etc.
Seeing how at least eight drivers use this code, (not counting the PCMCIA ones either) it is easy to break some card by what seems like a simple innocent change. Please contact me or Donald if you think you have found something that needs changing. -- PG
Changelog:
Paul Gortmaker : remove set_bit lock, other cleanups. Paul Gortmaker : add ei_get_8390_hdr() so we can pass skb's to ei_block_input() for eth_io_copy_and_sum(). Paul Gortmaker : exchange static int ei_pingpong for a #define, also add better Tx error handling. Paul Gortmaker : rewrite Rx overrun handling as per NS specs. Alexey Kuznetsov : use the 8390's six bit hash multicast filter. Paul Gortmaker : tweak ANK's above multicast changes a bit. Paul Gortmaker : update packet statistics for v2.1.x Alan Cox : support arbitrary stupid port mappings on the 68K Macintosh. Support >16bit I/O spaces Paul Gortmaker : add kmod support for auto-loading of the 8390 module by all drivers that require it. Alan Cox : Spinlocking work, added 'BUG_83C690' Paul Gortmaker : Separate out Tx timeout code from Tx path.
Sources: The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
/* These are the operational function interfaces to board-specific routines. void reset_8390(struct net_device *dev) Resets the board associated with DEV, including a hardware reset of the 8390. This is only called when there is a transmit timeout, and it is always followed by 8390_init(). void block_output(struct net_device *dev, int count, const unsigned char *buf, int start_page) Write the COUNT bytes of BUF to the packet buffer at START_PAGE. The "page" value uses the 8390's 256-byte pages. void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page) Read the 4 byte, page aligned 8390 header. *If* there is a subsequent read, it will be of the rest of the packet. void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset) Read COUNT bytes from the packet buffer into the skb data area. Start reading from RING_OFFSET, the address as the 8390 sees it. This will always follow the read of the 8390 header.
*/ #define ei_reset_8390 (ei_local->reset_8390) #define ei_block_output (ei_local->block_output) #define ei_block_input (ei_local->block_input) #define ei_get_8390_hdr (ei_local->get_8390_hdr)
/* Routines generic to NS8390-based boards. */ staticvoid NS8390_trigger_send(struct net_device *dev, unsignedint length, int start_page); staticvoid do_set_multicast_list(struct net_device *dev);
/* * SMP and the 8390 setup. * * The 8390 isn't exactly designed to be multithreaded on RX/TX. There is * a page register that controls bank and packet buffer access. We guard * this with ei_local->page_lock. Nobody should assume or set the page other * than zero when the lock is not held. Lock holders must restore page 0 * before unlocking. Even pure readers must take the lock to protect in * page 0. * * To make life difficult the chip can also be very slow. We therefore can't * just use spinlocks. For the longer lockups we disable the irq the device * sits on and hold the lock. We must hold the lock because there is a dual * processor case other than interrupts (get stats/set multicast list in * parallel with each other and transmit). * * Note: in theory we can just disable the irq on the card _but_ there is * a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs" * enter lock, take the queued irq. So we waddle instead of flying. * * Finally by special arrangement for the purpose of being generally * annoying the transmit function is called bh atomic. That places * restrictions on the user context callers as disable_irq won't save * them.
*/
/** * ax_open - Open/initialize the board. * @dev: network device to initialize * * This routine goes all-out, setting everything * up anew at each open, even though many of these registers should only * need to be set once at boot.
*/ staticint ax_open(struct net_device *dev)
{ unsignedlong flags; struct ei_device *ei_local = netdev_priv(dev);
/* * Grab the page lock so we own the register set, then call * the init function.
*/
spin_lock_irqsave(&ei_local->page_lock, flags);
AX88190_init(dev, 1); /* Set the flag before we drop the lock, That way the IRQ arrives
after its set and we get no silly warnings */
netif_start_queue(dev);
spin_unlock_irqrestore(&ei_local->page_lock, flags);
ei_local->irqlock = 0; return 0;
}
/** * ax_close - shut down network device * @dev: network device to close * * Opposite of ax_open(). Only used when "ifconfig <devname> down" is done.
*/ staticint ax_close(struct net_device *dev)
{ unsignedlong flags;
/** * axnet_tx_timeout - handle transmit time out condition * @dev: network device which has apparently fallen asleep * @txqueue: unused * * Called by kernel when device never acknowledges a transmit has * completed (or failed) - i.e. never posted a Tx related interrupt.
*/
if (!isr && !dev->stats.tx_packets)
{ /* The 8390 probably hasn't gotten on the cable yet. */
ei_local->interface_num ^= 1; /* Try a different xcvr. */
}
/* Ugly but a reset can be slow, yet must be protected */
spin_lock_irqsave(&ei_local->page_lock, flags);
/* Try to restart the card. Perhaps the user has fixed something. */
ei_reset_8390(dev);
AX88190_init(dev, 1);
/** * axnet_start_xmit - begin packet transmission * @skb: packet to be sent * @dev: network device to which packet is sent * * Sends a packet to an 8390 network device.
*/
/* Mask interrupts from the ethercard. SMP: We have to grab the lock here otherwise the IRQ handler on another CPU can flip window and race the IRQ mask set. We end
up trashing the mcast filter not disabling irqs if we don't lock */
/* * We have two Tx slots available for use. Find the first free * slot, and then perform some sanity checks. With two Tx bufs, * you get very close to transmitting back-to-back packets. With * only one Tx buf, the transmitter sits idle while you reload the * card, leaving a substantial gap between each transmitted packet.
*/
/* * Okay, now upload the packet and trigger a send if the transmitter * isn't already sending. If it is busy, the interrupt handler will * trigger the send later, upon receiving a Tx done interrupt.
*/
/** * ax_interrupt - handle the interrupts from an 8390 * @irq: interrupt number * @dev_id: a pointer to the net_device * * Handle the ether interface interrupts. We pull packets from * the 8390 via the card specific functions and fire them at the networking * stack. We also handle transmit completions and wake the transmit path if * necessary. We also update the counters and do other housekeeping as * needed.
*/
static irqreturn_t ax_interrupt(int irq, void *dev_id)
{ struct net_device *dev = dev_id; long e8390_base; int interrupts, nr_serviced = 0, i; struct ei_device *ei_local; int handled = 0; unsignedlong flags;
if (ei_local->irqlock) { #if 1 /* This might just be an interrupt for a PCI device sharing this line */ constchar *msg; /* The "irqlock" check is only for testing. */ if (ei_local->irqlock)
msg = "Interrupted while interrupts are masked!"; else
msg = "Reentering the interrupt handler!";
netdev_info(dev, "%s, isr=%#2x imr=%#2x\n",
msg,
inb_p(e8390_base + EN0_ISR),
inb_p(e8390_base + EN0_IMR)); #endif
spin_unlock_irqrestore(&ei_local->page_lock, flags); return IRQ_NONE;
}
/** * ei_tx_err - handle transmitter error * @dev: network device which threw the exception * * A transmitter error has happened. Most likely excess collisions (which * is a fairly normal condition). If the error is one where the Tx will * have been aborted, we try and send another one right away, instead of * letting the failed packet sit and collect dust in the Tx buffer. This * is a much better solution as it avoids kernel based Tx timeouts, and * an unnecessary card reset. * * Called with lock held.
*/
#ifdef VERBOSE_ERROR_DUMP
netdev_dbg(dev, "transmitter error (%#2x):", txsr); if (txsr & ENTSR_ABT)
pr_cont(" excess-collisions"); if (txsr & ENTSR_ND)
pr_cont(" non-deferral"); if (txsr & ENTSR_CRS)
pr_cont(" lost-carrier"); if (txsr & ENTSR_FU)
pr_cont(" FIFO-underrun"); if (txsr & ENTSR_CDH)
pr_cont(" lost-heartbeat");
pr_cont("\n"); #endif
if (tx_was_aborted)
ei_tx_intr(dev); else
{
dev->stats.tx_errors++; if (txsr & ENTSR_CRS) dev->stats.tx_carrier_errors++; if (txsr & ENTSR_CDH) dev->stats.tx_heartbeat_errors++; if (txsr & ENTSR_OWC) dev->stats.tx_window_errors++;
}
}
/** * ei_tx_intr - transmit interrupt handler * @dev: network device for which tx intr is handled * * We have finished a transmit: check for errors and then trigger the next * packet to be sent. Called with lock held.
*/
staticvoid ei_tx_intr(struct net_device *dev)
{ long e8390_base = dev->base_addr; struct ei_device *ei_local = netdev_priv(dev); int status = inb(e8390_base + EN0_TSR);
/* * There are two Tx buffers, see which one finished, and trigger * the send of another one if it exists.
*/
ei_local->txqueue--;
/* Minimize Tx latency: update the statistics after we restart TXing. */ if (status & ENTSR_COL)
dev->stats.collisions++; if (status & ENTSR_PTX)
dev->stats.tx_packets++; else
{
dev->stats.tx_errors++; if (status & ENTSR_ABT)
{
dev->stats.tx_aborted_errors++;
dev->stats.collisions += 16;
} if (status & ENTSR_CRS)
dev->stats.tx_carrier_errors++; if (status & ENTSR_FU)
dev->stats.tx_fifo_errors++; if (status & ENTSR_CDH)
dev->stats.tx_heartbeat_errors++; if (status & ENTSR_OWC)
dev->stats.tx_window_errors++;
}
netif_wake_queue(dev);
}
/** * ei_receive - receive some packets * @dev: network device with which receive will be run * * We have a good packet(s), get it/them out of the buffers. * Called with lock held.
*/
while (++rx_pkt_count < 10)
{ int pkt_len, pkt_stat;
/* Get the rx page (incoming packet pointer). */
rxing_page = inb_p(e8390_base + EN1_CURPAG -1);
/* Remove one frame from the ring. Boundary is always a page behind. */
this_frame = inb_p(e8390_base + EN0_BOUNDARY) + 1; if (this_frame >= ei_local->stop_page)
this_frame = ei_local->rx_start_page;
/* Someday we'll omit the previous, iff we never get this message. (There is at least one clone claimed to have a problem.) Keep quiet if it looks like a card removal. One problem here is that some clones crash in roughly the same way.
*/ if ((netif_msg_rx_err(ei_local)) &&
this_frame != ei_local->current_page &&
(this_frame != 0x0 || rxing_page != 0xFF))
netdev_err(dev, "mismatched read page pointers %2x vs %2x\n",
this_frame, ei_local->current_page);
if (this_frame == rxing_page) /* Read all the frames? */ break; /* Done for now */
skb = netdev_alloc_skb(dev, pkt_len + 2); if (skb == NULL)
{
netif_err(ei_local, rx_err, dev, "Couldn't allocate a sk_buff of size %d\n",
pkt_len);
dev->stats.rx_dropped++; break;
} else
{
skb_reserve(skb,2); /* IP headers on 16 byte boundaries */
skb_put(skb, pkt_len); /* Make room */
ei_block_input(dev, pkt_len, skb, current_offset + sizeof(rx_frame));
skb->protocol=eth_type_trans(skb,dev);
netif_rx(skb);
dev->stats.rx_packets++;
dev->stats.rx_bytes += pkt_len; if (pkt_stat & ENRSR_PHY)
dev->stats.multicast++;
}
} else
{
netif_err(ei_local, rx_err, dev, "bogus packet: status=%#2x nxpg=%#2x size=%d\n",
rx_frame.status, rx_frame.next,
rx_frame.count);
dev->stats.rx_errors++; /* NB: The NIC counts CRC, frame and missed errors. */ if (pkt_stat & ENRSR_FO)
dev->stats.rx_fifo_errors++;
}
next_frame = rx_frame.next;
/* This _should_ never happen: it's here for avoiding bad clones. */ if (next_frame >= ei_local->stop_page) {
netdev_info(dev, "next frame inconsistency, %#2x\n",
next_frame);
next_frame = ei_local->rx_start_page;
}
ei_local->current_page = next_frame;
outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
}
}
/** * ei_rx_overrun - handle receiver overrun * @dev: network device which threw exception * * We have a receiver overrun: we have to kick the 8390 to get it started * again. Problem is that you have to kick it exactly as NS prescribes in * the updated datasheets, or "the NIC may act in an unpredictable manner." * This includes causing "the NIC to defer indefinitely when it is stopped * on a busy network." Ugh. * Called with lock held. Don't call this with the interrupts off or your * computer will hate you - it takes 10ms or so.
*/
/* * Record whether a Tx was in progress and then issue the * stop command.
*/
was_txing = inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
/* * Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total. * We wait at least 2ms.
*/
mdelay(2);
/* * Reset RBCR[01] back to zero as per magic incantation.
*/
outb_p(0x00, e8390_base+EN0_RCNTLO);
outb_p(0x00, e8390_base+EN0_RCNTHI);
/* * See if any Tx was interrupted or not. According to NS, this * step is vital, and skipping it will cause no end of havoc.
*/
if (was_txing)
{ unsignedchar tx_completed = inb_p(e8390_base+EN0_ISR) & (ENISR_TX+ENISR_TX_ERR); if (!tx_completed)
must_resend = 1;
}
/* * Have to enter loopback mode and then restart the NIC before * you are allowed to slurp packets up off the ring.
*/
outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START, e8390_base + E8390_CMD);
/* * Clear the Rx ring of all the debris, and ack the interrupt.
*/
ei_receive(dev);
/* * Leave loopback mode, and resend any packet that got stopped.
*/
outb_p(E8390_TXCONFIG | info->duplex_flag, e8390_base + EN0_TXCR); if (must_resend)
outb_p(E8390_NODMA + E8390_PAGE0 + E8390_START + E8390_TRANS, e8390_base + E8390_CMD);
}
/* * Collect the stats. This is called unlocked and from several contexts.
*/
netdev_for_each_mc_addr(ha, dev) {
crc = ether_crc(ETH_ALEN, ha->addr); /* * The 8390 uses the 6 most significant bits of the * CRC to index the multicast table.
*/
bits[crc>>29] |= (1<<((crc>>26)&7));
}
}
/** * do_set_multicast_list - set/clear multicast filter * @dev: net device for which multicast filter is adjusted * * Set or clear the multicast filter for this adaptor. * Must be called with lock held.
*/
staticvoid do_set_multicast_list(struct net_device *dev)
{ long e8390_base = dev->base_addr; int i; struct ei_device *ei_local = netdev_priv(dev);
if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) {
memset(ei_local->mcfilter, 0, 8); if (!netdev_mc_empty(dev))
make_mc_bits(ei_local->mcfilter, dev);
} else { /* set to accept-all */
memset(ei_local->mcfilter, 0xFF, 8);
}
/* * Called without lock held. This is invoked from user context and may * be parallel to just about everything else. Its also fairly quick and * not called too often. Must protect against both bh and irq users
*/
/* This page of functions should be 8390 generic */ /* Follow National Semi's recommendations for initializing the "NIC". */
/** * AX88190_init - initialize 8390 hardware * @dev: network device to initialize * @startp: boolean. non-zero value to initiate chip processing * * Must be called with lock held.
*/
staticvoid AX88190_init(struct net_device *dev, int startp)
{ struct axnet_dev *info = PRIV(dev); long e8390_base = dev->base_addr; struct ei_device *ei_local = netdev_priv(dev); int i; int endcfg = ei_local->word16 ? (0x48 | ENDCFG_WTS) : 0x48;
if(sizeof(struct e8390_pkt_hdr)!=4)
panic("8390.c: header struct mispacked\n"); /* Follow National Semi's recommendations for initing the DP83902. */
outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */ /* Clear the remote byte count registers. */
outb_p(0x00, e8390_base + EN0_RCNTLO);
outb_p(0x00, e8390_base + EN0_RCNTHI); /* Set to monitor and loopback mode -- this is vital!. */
outb_p(E8390_RXOFF|0x40, e8390_base + EN0_RXCR); /* 0x60 */
outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */ /* Set the transmit page and receive ring. */
outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
ei_local->tx1 = ei_local->tx2 = 0;
outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
outb_p(ei_local->stop_page-1, e8390_base + EN0_BOUNDARY); /* 3c503 says 0x3f,NS0x26*/
ei_local->current_page = ei_local->rx_start_page; /* assert boundary+1 */
outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG); /* Clear the pending interrupts and mask. */
outb_p(0xFF, e8390_base + EN0_ISR);
outb_p(0x00, e8390_base + EN0_IMR);
/* Copy the station address into the DS8390 registers. */
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