/* 8390.c: A general NS8390 ethernet driver core for linux. */
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/*
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Written 1992-94 by Donald Becker.
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Copyright 1993 United States Government as represented by the
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Director, National Security Agency.
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This software may be used and distributed according to the terms
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of the GNU General Public License, incorporated herein by reference.
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The author may be reached as becker@scyld.com, or C/O
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Scyld Computing Corporation
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410 Severn Ave., Suite 210
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Annapolis MD 21403
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This is the chip-specific code for many 8390-based ethernet adaptors.
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This is not a complete driver, it must be combined with board-specific
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code such as ne.c, wd.c, 3c503.c, etc.
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Seeing how at least eight drivers use this code, (not counting the
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PCMCIA ones either) it is easy to break some card by what seems like
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a simple innocent change. Please contact me or Donald if you think
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you have found something that needs changing. -- PG
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Changelog:
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Paul Gortmaker : remove set_bit lock, other cleanups.
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Paul Gortmaker : add ei_get_8390_hdr() so we can pass skb's to
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ei_block_input() for eth_io_copy_and_sum().
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Paul Gortmaker : exchange static int ei_pingpong for a #define,
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also add better Tx error handling.
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Paul Gortmaker : rewrite Rx overrun handling as per NS specs.
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Alexey Kuznetsov : use the 8390's six bit hash multicast filter.
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Paul Gortmaker : tweak ANK's above multicast changes a bit.
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Paul Gortmaker : update packet statistics for v2.1.x
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Alan Cox : support arbitrary stupid port mappings on the
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68K Macintosh. Support >16bit I/O spaces
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Paul Gortmaker : add kmod support for auto-loading of the 8390
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module by all drivers that require it.
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Alan Cox : Spinlocking work, added 'BUG_83C690'
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Paul Gortmaker : Separate out Tx timeout code from Tx path.
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Paul Gortmaker : Remove old unused single Tx buffer code.
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Hayato Fujiwara : Add m32r support.
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Paul Gortmaker : use skb_padto() instead of stack scratch area
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Sources:
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The National Semiconductor LAN Databook, and the 3Com 3c503 databook.
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*/
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#include <linux/build_bug.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/bitops.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <asm/irq.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/in.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/crc32.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#define NS8390_CORE
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#include "8390.h"
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#define BUG_83C690
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/* These are the operational function interfaces to board-specific
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routines.
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void reset_8390(struct net_device *dev)
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Resets the board associated with DEV, including a hardware reset of
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the 8390. This is only called when there is a transmit timeout, and
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it is always followed by 8390_init().
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void block_output(struct net_device *dev, int count, const unsigned char *buf,
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int start_page)
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Write the COUNT bytes of BUF to the packet buffer at START_PAGE. The
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"page" value uses the 8390's 256-byte pages.
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void get_8390_hdr(struct net_device *dev, struct e8390_hdr *hdr, int ring_page)
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Read the 4 byte, page aligned 8390 header. *If* there is a
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subsequent read, it will be of the rest of the packet.
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void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
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Read COUNT bytes from the packet buffer into the skb data area. Start
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reading from RING_OFFSET, the address as the 8390 sees it. This will always
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follow the read of the 8390 header.
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*/
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#define ei_reset_8390 (ei_local->reset_8390)
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#define ei_block_output (ei_local->block_output)
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#define ei_block_input (ei_local->block_input)
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#define ei_get_8390_hdr (ei_local->get_8390_hdr)
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/* Index to functions. */
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static void ei_tx_intr(struct net_device *dev);
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static void ei_tx_err(struct net_device *dev);
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static void ei_receive(struct net_device *dev);
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static void ei_rx_overrun(struct net_device *dev);
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/* Routines generic to NS8390-based boards. */
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static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
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int start_page);
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static void do_set_multicast_list(struct net_device *dev);
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static void __NS8390_init(struct net_device *dev, int startp);
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static unsigned version_printed;
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static int msg_enable;
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static const int default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_RX_ERR |
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NETIF_MSG_TX_ERR);
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module_param(msg_enable, int, 0444);
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MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");
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/*
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* SMP and the 8390 setup.
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*
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* The 8390 isn't exactly designed to be multithreaded on RX/TX. There is
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* a page register that controls bank and packet buffer access. We guard
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* this with ei_local->page_lock. Nobody should assume or set the page other
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* than zero when the lock is not held. Lock holders must restore page 0
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* before unlocking. Even pure readers must take the lock to protect in
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* page 0.
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*
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* To make life difficult the chip can also be very slow. We therefore can't
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* just use spinlocks. For the longer lockups we disable the irq the device
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* sits on and hold the lock. We must hold the lock because there is a dual
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* processor case other than interrupts (get stats/set multicast list in
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* parallel with each other and transmit).
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*
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* Note: in theory we can just disable the irq on the card _but_ there is
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* a latency on SMP irq delivery. So we can easily go "disable irq" "sync irqs"
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* enter lock, take the queued irq. So we waddle instead of flying.
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*
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* Finally by special arrangement for the purpose of being generally
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* annoying the transmit function is called bh atomic. That places
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* restrictions on the user context callers as disable_irq won't save
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* them.
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*
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* Additional explanation of problems with locking by Alan Cox:
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*
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* "The author (me) didn't use spin_lock_irqsave because the slowness of the
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* card means that approach caused horrible problems like losing serial data
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* at 38400 baud on some chips. Remember many 8390 nics on PCI were ISA
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* chips with FPGA front ends.
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*
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* Ok the logic behind the 8390 is very simple:
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*
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* Things to know
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* - IRQ delivery is asynchronous to the PCI bus
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* - Blocking the local CPU IRQ via spin locks was too slow
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* - The chip has register windows needing locking work
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*
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* So the path was once (I say once as people appear to have changed it
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* in the mean time and it now looks rather bogus if the changes to use
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* disable_irq_nosync_irqsave are disabling the local IRQ)
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*
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*
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* Take the page lock
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* Mask the IRQ on chip
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* Disable the IRQ (but not mask locally- someone seems to have
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* broken this with the lock validator stuff)
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* [This must be _nosync as the page lock may otherwise
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* deadlock us]
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* Drop the page lock and turn IRQs back on
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*
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* At this point an existing IRQ may still be running but we can't
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* get a new one
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*
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* Take the lock (so we know the IRQ has terminated) but don't mask
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* the IRQs on the processor
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* Set irqlock [for debug]
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*
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* Transmit (slow as ****)
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*
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* re-enable the IRQ
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*
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*
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* We have to use disable_irq because otherwise you will get delayed
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* interrupts on the APIC bus deadlocking the transmit path.
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*
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* Quite hairy but the chip simply wasn't designed for SMP and you can't
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* even ACK an interrupt without risking corrupting other parallel
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* activities on the chip." [lkml, 25 Jul 2007]
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*/
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/**
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* ei_open - Open/initialize the board.
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* @dev: network device to initialize
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*
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* This routine goes all-out, setting everything
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* up anew at each open, even though many of these registers should only
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* need to be set once at boot.
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*/
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static int __ei_open(struct net_device *dev)
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{
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unsigned long flags;
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struct ei_device *ei_local = netdev_priv(dev);
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if (dev->watchdog_timeo <= 0)
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dev->watchdog_timeo = TX_TIMEOUT;
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/*
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* Grab the page lock so we own the register set, then call
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* the init function.
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*/
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spin_lock_irqsave(&ei_local->page_lock, flags);
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__NS8390_init(dev, 1);
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/* Set the flag before we drop the lock, That way the IRQ arrives
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after its set and we get no silly warnings */
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netif_start_queue(dev);
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spin_unlock_irqrestore(&ei_local->page_lock, flags);
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ei_local->irqlock = 0;
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return 0;
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}
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/**
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* ei_close - shut down network device
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* @dev: network device to close
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*
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* Opposite of ei_open(). Only used when "ifconfig <devname> down" is done.
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*/
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static int __ei_close(struct net_device *dev)
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{
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struct ei_device *ei_local = netdev_priv(dev);
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unsigned long flags;
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/*
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* Hold the page lock during close
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*/
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spin_lock_irqsave(&ei_local->page_lock, flags);
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__NS8390_init(dev, 0);
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spin_unlock_irqrestore(&ei_local->page_lock, flags);
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netif_stop_queue(dev);
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return 0;
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}
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/**
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* ei_tx_timeout - handle transmit time out condition
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* @dev: network device which has apparently fallen asleep
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*
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* Called by kernel when device never acknowledges a transmit has
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* completed (or failed) - i.e. never posted a Tx related interrupt.
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*/
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static void __ei_tx_timeout(struct net_device *dev, unsigned int txqueue)
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{
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unsigned long e8390_base = dev->base_addr;
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struct ei_device *ei_local = netdev_priv(dev);
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int txsr, isr, tickssofar = jiffies - dev_trans_start(dev);
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unsigned long flags;
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dev->stats.tx_errors++;
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spin_lock_irqsave(&ei_local->page_lock, flags);
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txsr = ei_inb(e8390_base+EN0_TSR);
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isr = ei_inb(e8390_base+EN0_ISR);
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spin_unlock_irqrestore(&ei_local->page_lock, flags);
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netdev_dbg(dev, "Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d\n",
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(txsr & ENTSR_ABT) ? "excess collisions." :
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(isr) ? "lost interrupt?" : "cable problem?",
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txsr, isr, tickssofar);
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if (!isr && !dev->stats.tx_packets) {
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/* The 8390 probably hasn't gotten on the cable yet. */
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ei_local->interface_num ^= 1; /* Try a different xcvr. */
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}
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/* Ugly but a reset can be slow, yet must be protected */
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disable_irq_nosync_lockdep(dev->irq);
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spin_lock(&ei_local->page_lock);
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/* Try to restart the card. Perhaps the user has fixed something. */
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ei_reset_8390(dev);
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__NS8390_init(dev, 1);
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spin_unlock(&ei_local->page_lock);
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enable_irq_lockdep(dev->irq);
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netif_wake_queue(dev);
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}
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/**
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* ei_start_xmit - begin packet transmission
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* @skb: packet to be sent
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* @dev: network device to which packet is sent
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*
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* Sends a packet to an 8390 network device.
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*/
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static netdev_tx_t __ei_start_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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unsigned long e8390_base = dev->base_addr;
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struct ei_device *ei_local = netdev_priv(dev);
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int send_length = skb->len, output_page;
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unsigned long flags;
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char buf[ETH_ZLEN];
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char *data = skb->data;
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if (skb->len < ETH_ZLEN) {
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memset(buf, 0, ETH_ZLEN); /* more efficient than doing just the needed bits */
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memcpy(buf, data, skb->len);
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send_length = ETH_ZLEN;
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data = buf;
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}
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/* Mask interrupts from the ethercard.
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SMP: We have to grab the lock here otherwise the IRQ handler
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on another CPU can flip window and race the IRQ mask set. We end
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up trashing the mcast filter not disabling irqs if we don't lock */
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spin_lock_irqsave(&ei_local->page_lock, flags);
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ei_outb_p(0x00, e8390_base + EN0_IMR);
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spin_unlock_irqrestore(&ei_local->page_lock, flags);
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/*
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* Slow phase with lock held.
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*/
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disable_irq_nosync_lockdep_irqsave(dev->irq, &flags);
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spin_lock(&ei_local->page_lock);
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ei_local->irqlock = 1;
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/*
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* We have two Tx slots available for use. Find the first free
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* slot, and then perform some sanity checks. With two Tx bufs,
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* you get very close to transmitting back-to-back packets. With
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* only one Tx buf, the transmitter sits idle while you reload the
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* card, leaving a substantial gap between each transmitted packet.
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*/
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if (ei_local->tx1 == 0) {
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output_page = ei_local->tx_start_page;
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ei_local->tx1 = send_length;
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if ((netif_msg_tx_queued(ei_local)) &&
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ei_local->tx2 > 0)
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netdev_dbg(dev,
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"idle transmitter tx2=%d, lasttx=%d, txing=%d\n",
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ei_local->tx2, ei_local->lasttx, ei_local->txing);
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} else if (ei_local->tx2 == 0) {
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output_page = ei_local->tx_start_page + TX_PAGES/2;
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ei_local->tx2 = send_length;
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if ((netif_msg_tx_queued(ei_local)) &&
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ei_local->tx1 > 0)
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netdev_dbg(dev,
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"idle transmitter, tx1=%d, lasttx=%d, txing=%d\n",
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ei_local->tx1, ei_local->lasttx, ei_local->txing);
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} else { /* We should never get here. */
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netif_dbg(ei_local, tx_err, dev,
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"No Tx buffers free! tx1=%d tx2=%d last=%d\n",
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ei_local->tx1, ei_local->tx2, ei_local->lasttx);
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ei_local->irqlock = 0;
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netif_stop_queue(dev);
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ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
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spin_unlock(&ei_local->page_lock);
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enable_irq_lockdep_irqrestore(dev->irq, &flags);
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dev->stats.tx_errors++;
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return NETDEV_TX_BUSY;
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}
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/*
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* Okay, now upload the packet and trigger a send if the transmitter
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* isn't already sending. If it is busy, the interrupt handler will
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* trigger the send later, upon receiving a Tx done interrupt.
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*/
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ei_block_output(dev, send_length, data, output_page);
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if (!ei_local->txing) {
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ei_local->txing = 1;
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NS8390_trigger_send(dev, send_length, output_page);
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if (output_page == ei_local->tx_start_page) {
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ei_local->tx1 = -1;
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ei_local->lasttx = -1;
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} else {
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ei_local->tx2 = -1;
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ei_local->lasttx = -2;
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}
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} else
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ei_local->txqueue++;
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if (ei_local->tx1 && ei_local->tx2)
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netif_stop_queue(dev);
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else
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netif_start_queue(dev);
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/* Turn 8390 interrupts back on. */
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ei_local->irqlock = 0;
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ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
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spin_unlock(&ei_local->page_lock);
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enable_irq_lockdep_irqrestore(dev->irq, &flags);
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skb_tx_timestamp(skb);
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dev_consume_skb_any(skb);
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dev->stats.tx_bytes += send_length;
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return NETDEV_TX_OK;
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}
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/**
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* ei_interrupt - handle the interrupts from an 8390
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* @irq: interrupt number
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* @dev_id: a pointer to the net_device
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*
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* Handle the ether interface interrupts. We pull packets from
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* the 8390 via the card specific functions and fire them at the networking
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* stack. We also handle transmit completions and wake the transmit path if
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* necessary. We also update the counters and do other housekeeping as
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* needed.
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*/
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static irqreturn_t __ei_interrupt(int irq, void *dev_id)
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{
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struct net_device *dev = dev_id;
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unsigned long e8390_base = dev->base_addr;
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int interrupts, nr_serviced = 0;
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struct ei_device *ei_local = netdev_priv(dev);
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/*
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* Protect the irq test too.
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*/
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spin_lock(&ei_local->page_lock);
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if (ei_local->irqlock) {
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/*
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* This might just be an interrupt for a PCI device sharing
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* this line
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*/
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netdev_err(dev, "Interrupted while interrupts are masked! isr=%#2x imr=%#2x\n",
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ei_inb_p(e8390_base + EN0_ISR),
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ei_inb_p(e8390_base + EN0_IMR));
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spin_unlock(&ei_local->page_lock);
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return IRQ_NONE;
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}
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/* Change to page 0 and read the intr status reg. */
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ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
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netif_dbg(ei_local, intr, dev, "interrupt(isr=%#2.2x)\n",
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ei_inb_p(e8390_base + EN0_ISR));
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/* !!Assumption!! -- we stay in page 0. Don't break this. */
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while ((interrupts = ei_inb_p(e8390_base + EN0_ISR)) != 0 &&
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++nr_serviced < MAX_SERVICE) {
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if (!netif_running(dev)) {
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netdev_warn(dev, "interrupt from stopped card\n");
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/* rmk - acknowledge the interrupts */
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ei_outb_p(interrupts, e8390_base + EN0_ISR);
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interrupts = 0;
|
break;
|
}
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if (interrupts & ENISR_OVER)
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ei_rx_overrun(dev);
|
else if (interrupts & (ENISR_RX+ENISR_RX_ERR)) {
|
/* Got a good (?) packet. */
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ei_receive(dev);
|
}
|
/* Push the next to-transmit packet through. */
|
if (interrupts & ENISR_TX)
|
ei_tx_intr(dev);
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else if (interrupts & ENISR_TX_ERR)
|
ei_tx_err(dev);
|
|
if (interrupts & ENISR_COUNTERS) {
|
dev->stats.rx_frame_errors += ei_inb_p(e8390_base + EN0_COUNTER0);
|
dev->stats.rx_crc_errors += ei_inb_p(e8390_base + EN0_COUNTER1);
|
dev->stats.rx_missed_errors += ei_inb_p(e8390_base + EN0_COUNTER2);
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ei_outb_p(ENISR_COUNTERS, e8390_base + EN0_ISR); /* Ack intr. */
|
}
|
|
/* Ignore any RDC interrupts that make it back to here. */
|
if (interrupts & ENISR_RDC)
|
ei_outb_p(ENISR_RDC, e8390_base + EN0_ISR);
|
|
ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
|
}
|
|
if (interrupts && (netif_msg_intr(ei_local))) {
|
ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base + E8390_CMD);
|
if (nr_serviced >= MAX_SERVICE) {
|
/* 0xFF is valid for a card removal */
|
if (interrupts != 0xFF)
|
netdev_warn(dev, "Too much work at interrupt, status %#2.2x\n",
|
interrupts);
|
ei_outb_p(ENISR_ALL, e8390_base + EN0_ISR); /* Ack. most intrs. */
|
} else {
|
netdev_warn(dev, "unknown interrupt %#2x\n", interrupts);
|
ei_outb_p(0xff, e8390_base + EN0_ISR); /* Ack. all intrs. */
|
}
|
}
|
spin_unlock(&ei_local->page_lock);
|
return IRQ_RETVAL(nr_serviced > 0);
|
}
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER
|
static void __ei_poll(struct net_device *dev)
|
{
|
disable_irq(dev->irq);
|
__ei_interrupt(dev->irq, dev);
|
enable_irq(dev->irq);
|
}
|
#endif
|
|
/**
|
* 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.
|
*/
|
|
static void ei_tx_err(struct net_device *dev)
|
{
|
unsigned long e8390_base = dev->base_addr;
|
/* ei_local is used on some platforms via the EI_SHIFT macro */
|
struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
|
unsigned char txsr = ei_inb_p(e8390_base+EN0_TSR);
|
unsigned char tx_was_aborted = txsr & (ENTSR_ABT+ENTSR_FU);
|
|
#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
|
|
ei_outb_p(ENISR_TX_ERR, e8390_base + EN0_ISR); /* Ack intr. */
|
|
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.
|
*/
|
|
static void ei_tx_intr(struct net_device *dev)
|
{
|
unsigned long e8390_base = dev->base_addr;
|
struct ei_device *ei_local = netdev_priv(dev);
|
int status = ei_inb(e8390_base + EN0_TSR);
|
|
ei_outb_p(ENISR_TX, e8390_base + EN0_ISR); /* Ack intr. */
|
|
/*
|
* There are two Tx buffers, see which one finished, and trigger
|
* the send of another one if it exists.
|
*/
|
ei_local->txqueue--;
|
|
if (ei_local->tx1 < 0) {
|
if (ei_local->lasttx != 1 && ei_local->lasttx != -1)
|
pr_err("%s: bogus last_tx_buffer %d, tx1=%d\n",
|
ei_local->name, ei_local->lasttx, ei_local->tx1);
|
ei_local->tx1 = 0;
|
if (ei_local->tx2 > 0) {
|
ei_local->txing = 1;
|
NS8390_trigger_send(dev, ei_local->tx2, ei_local->tx_start_page + 6);
|
netif_trans_update(dev);
|
ei_local->tx2 = -1;
|
ei_local->lasttx = 2;
|
} else {
|
ei_local->lasttx = 20;
|
ei_local->txing = 0;
|
}
|
} else if (ei_local->tx2 < 0) {
|
if (ei_local->lasttx != 2 && ei_local->lasttx != -2)
|
pr_err("%s: bogus last_tx_buffer %d, tx2=%d\n",
|
ei_local->name, ei_local->lasttx, ei_local->tx2);
|
ei_local->tx2 = 0;
|
if (ei_local->tx1 > 0) {
|
ei_local->txing = 1;
|
NS8390_trigger_send(dev, ei_local->tx1, ei_local->tx_start_page);
|
netif_trans_update(dev);
|
ei_local->tx1 = -1;
|
ei_local->lasttx = 1;
|
} else {
|
ei_local->lasttx = 10;
|
ei_local->txing = 0;
|
}
|
} /* else
|
netdev_warn(dev, "unexpected TX-done interrupt, lasttx=%d\n",
|
ei_local->lasttx);
|
*/
|
|
/* 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.
|
*/
|
|
static void ei_receive(struct net_device *dev)
|
{
|
unsigned long e8390_base = dev->base_addr;
|
struct ei_device *ei_local = netdev_priv(dev);
|
unsigned char rxing_page, this_frame, next_frame;
|
unsigned short current_offset;
|
int rx_pkt_count = 0;
|
struct e8390_pkt_hdr rx_frame;
|
int num_rx_pages = ei_local->stop_page-ei_local->rx_start_page;
|
|
while (++rx_pkt_count < 10) {
|
int pkt_len, pkt_stat;
|
|
/* Get the rx page (incoming packet pointer). */
|
ei_outb_p(E8390_NODMA+E8390_PAGE1, e8390_base + E8390_CMD);
|
rxing_page = ei_inb_p(e8390_base + EN1_CURPAG);
|
ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base + E8390_CMD);
|
|
/* Remove one frame from the ring. Boundary is always a page behind. */
|
this_frame = ei_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_status(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 */
|
|
current_offset = this_frame << 8;
|
ei_get_8390_hdr(dev, &rx_frame, this_frame);
|
|
pkt_len = rx_frame.count - sizeof(struct e8390_pkt_hdr);
|
pkt_stat = rx_frame.status;
|
|
next_frame = this_frame + 1 + ((pkt_len+4)>>8);
|
|
/* Check for bogosity warned by 3c503 book: the status byte is never
|
written. This happened a lot during testing! This code should be
|
cleaned up someday. */
|
if (rx_frame.next != next_frame &&
|
rx_frame.next != next_frame + 1 &&
|
rx_frame.next != next_frame - num_rx_pages &&
|
rx_frame.next != next_frame + 1 - num_rx_pages) {
|
ei_local->current_page = rxing_page;
|
ei_outb(ei_local->current_page-1, e8390_base+EN0_BOUNDARY);
|
dev->stats.rx_errors++;
|
continue;
|
}
|
|
if (pkt_len < 60 || pkt_len > 1518) {
|
netif_dbg(ei_local, rx_status, dev,
|
"bogus packet size: %d, status=%#2x nxpg=%#2x\n",
|
rx_frame.count, rx_frame.status,
|
rx_frame.next);
|
dev->stats.rx_errors++;
|
dev->stats.rx_length_errors++;
|
} else if ((pkt_stat & 0x0F) == ENRSR_RXOK) {
|
struct sk_buff *skb;
|
|
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);
|
if (!skb_defer_rx_timestamp(skb))
|
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_notice(dev, "next frame inconsistency, %#2x\n",
|
next_frame);
|
next_frame = ei_local->rx_start_page;
|
}
|
ei_local->current_page = next_frame;
|
ei_outb_p(next_frame-1, e8390_base+EN0_BOUNDARY);
|
}
|
|
/* We used to also ack ENISR_OVER here, but that would sometimes mask
|
a real overrun, leaving the 8390 in a stopped state with rec'vr off. */
|
ei_outb_p(ENISR_RX+ENISR_RX_ERR, e8390_base+EN0_ISR);
|
}
|
|
/**
|
* 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.
|
*/
|
|
static void ei_rx_overrun(struct net_device *dev)
|
{
|
unsigned long e8390_base = dev->base_addr;
|
unsigned char was_txing, must_resend = 0;
|
/* ei_local is used on some platforms via the EI_SHIFT macro */
|
struct ei_device *ei_local __maybe_unused = netdev_priv(dev);
|
|
/*
|
* Record whether a Tx was in progress and then issue the
|
* stop command.
|
*/
|
was_txing = ei_inb_p(e8390_base+E8390_CMD) & E8390_TRANS;
|
ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
|
|
netif_dbg(ei_local, rx_err, dev, "Receiver overrun\n");
|
dev->stats.rx_over_errors++;
|
|
/*
|
* Wait a full Tx time (1.2ms) + some guard time, NS says 1.6ms total.
|
* Early datasheets said to poll the reset bit, but now they say that
|
* it "is not a reliable indicator and subsequently should be ignored."
|
* We wait at least 10ms.
|
*/
|
|
mdelay(10);
|
|
/*
|
* Reset RBCR[01] back to zero as per magic incantation.
|
*/
|
ei_outb_p(0x00, e8390_base+EN0_RCNTLO);
|
ei_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) {
|
unsigned char tx_completed = ei_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.
|
*/
|
ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR);
|
ei_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);
|
ei_outb_p(ENISR_OVER, e8390_base+EN0_ISR);
|
|
/*
|
* Leave loopback mode, and resend any packet that got stopped.
|
*/
|
ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR);
|
if (must_resend)
|
ei_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.
|
*/
|
|
static struct net_device_stats *__ei_get_stats(struct net_device *dev)
|
{
|
unsigned long ioaddr = dev->base_addr;
|
struct ei_device *ei_local = netdev_priv(dev);
|
unsigned long flags;
|
|
/* If the card is stopped, just return the present stats. */
|
if (!netif_running(dev))
|
return &dev->stats;
|
|
spin_lock_irqsave(&ei_local->page_lock, flags);
|
/* Read the counter registers, assuming we are in page 0. */
|
dev->stats.rx_frame_errors += ei_inb_p(ioaddr + EN0_COUNTER0);
|
dev->stats.rx_crc_errors += ei_inb_p(ioaddr + EN0_COUNTER1);
|
dev->stats.rx_missed_errors += ei_inb_p(ioaddr + EN0_COUNTER2);
|
spin_unlock_irqrestore(&ei_local->page_lock, flags);
|
|
return &dev->stats;
|
}
|
|
/*
|
* Form the 64 bit 8390 multicast table from the linked list of addresses
|
* associated with this dev structure.
|
*/
|
|
static inline void make_mc_bits(u8 *bits, struct net_device *dev)
|
{
|
struct netdev_hw_addr *ha;
|
|
netdev_for_each_mc_addr(ha, dev) {
|
u32 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. May be called
|
* from a BH in 2.1.x. Must be called with lock held.
|
*/
|
|
static void do_set_multicast_list(struct net_device *dev)
|
{
|
unsigned 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
|
memset(ei_local->mcfilter, 0xFF, 8); /* mcast set to accept-all */
|
|
/*
|
* DP8390 manuals don't specify any magic sequence for altering
|
* the multicast regs on an already running card. To be safe, we
|
* ensure multicast mode is off prior to loading up the new hash
|
* table. If this proves to be not enough, we can always resort
|
* to stopping the NIC, loading the table and then restarting.
|
*
|
* Bug Alert! The MC regs on the SMC 83C690 (SMC Elite and SMC
|
* Elite16) appear to be write-only. The NS 8390 data sheet lists
|
* them as r/w so this is a bug. The SMC 83C790 (SMC Ultra and
|
* Ultra32 EISA) appears to have this bug fixed.
|
*/
|
|
if (netif_running(dev))
|
ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
|
ei_outb_p(E8390_NODMA + E8390_PAGE1, e8390_base + E8390_CMD);
|
for (i = 0; i < 8; i++) {
|
ei_outb_p(ei_local->mcfilter[i], e8390_base + EN1_MULT_SHIFT(i));
|
#ifndef BUG_83C690
|
if (ei_inb_p(e8390_base + EN1_MULT_SHIFT(i)) != ei_local->mcfilter[i])
|
netdev_err(dev, "Multicast filter read/write mismap %d\n",
|
i);
|
#endif
|
}
|
ei_outb_p(E8390_NODMA + E8390_PAGE0, e8390_base + E8390_CMD);
|
|
if (dev->flags&IFF_PROMISC)
|
ei_outb_p(E8390_RXCONFIG | 0x18, e8390_base + EN0_RXCR);
|
else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev))
|
ei_outb_p(E8390_RXCONFIG | 0x08, e8390_base + EN0_RXCR);
|
else
|
ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR);
|
}
|
|
/*
|
* 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
|
*/
|
|
static void __ei_set_multicast_list(struct net_device *dev)
|
{
|
unsigned long flags;
|
struct ei_device *ei_local = netdev_priv(dev);
|
|
spin_lock_irqsave(&ei_local->page_lock, flags);
|
do_set_multicast_list(dev);
|
spin_unlock_irqrestore(&ei_local->page_lock, flags);
|
}
|
|
/**
|
* ethdev_setup - init rest of 8390 device struct
|
* @dev: network device structure to init
|
*
|
* Initialize the rest of the 8390 device structure. Do NOT __init
|
* this, as it is used by 8390 based modular drivers too.
|
*/
|
|
static void ethdev_setup(struct net_device *dev)
|
{
|
struct ei_device *ei_local = netdev_priv(dev);
|
|
ether_setup(dev);
|
|
spin_lock_init(&ei_local->page_lock);
|
|
ei_local->msg_enable = netif_msg_init(msg_enable, default_msg_level);
|
|
if (netif_msg_drv(ei_local) && (version_printed++ == 0))
|
pr_info("%s", version);
|
}
|
|
/**
|
* alloc_ei_netdev - alloc_etherdev counterpart for 8390
|
* @size: extra bytes to allocate
|
*
|
* Allocate 8390-specific net_device.
|
*/
|
static struct net_device *____alloc_ei_netdev(int size)
|
{
|
return alloc_netdev(sizeof(struct ei_device) + size, "eth%d",
|
NET_NAME_UNKNOWN, ethdev_setup);
|
}
|
|
|
|
|
/* This page of functions should be 8390 generic */
|
/* Follow National Semi's recommendations for initializing the "NIC". */
|
|
/**
|
* NS8390_init - initialize 8390 hardware
|
* @dev: network device to initialize
|
* @startp: boolean. non-zero value to initiate chip processing
|
*
|
* Must be called with lock held.
|
*/
|
|
static void __NS8390_init(struct net_device *dev, int startp)
|
{
|
unsigned long e8390_base = dev->base_addr;
|
struct ei_device *ei_local = netdev_priv(dev);
|
int i;
|
int endcfg = ei_local->word16
|
? (0x48 | ENDCFG_WTS | (ei_local->bigendian ? ENDCFG_BOS : 0))
|
: 0x48;
|
|
BUILD_BUG_ON(sizeof(struct e8390_pkt_hdr) != 4);
|
/* Follow National Semi's recommendations for initing the DP83902. */
|
ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD); /* 0x21 */
|
ei_outb_p(endcfg, e8390_base + EN0_DCFG); /* 0x48 or 0x49 */
|
/* Clear the remote byte count registers. */
|
ei_outb_p(0x00, e8390_base + EN0_RCNTLO);
|
ei_outb_p(0x00, e8390_base + EN0_RCNTHI);
|
/* Set to monitor and loopback mode -- this is vital!. */
|
ei_outb_p(E8390_RXOFF, e8390_base + EN0_RXCR); /* 0x20 */
|
ei_outb_p(E8390_TXOFF, e8390_base + EN0_TXCR); /* 0x02 */
|
/* Set the transmit page and receive ring. */
|
ei_outb_p(ei_local->tx_start_page, e8390_base + EN0_TPSR);
|
ei_local->tx1 = ei_local->tx2 = 0;
|
ei_outb_p(ei_local->rx_start_page, e8390_base + EN0_STARTPG);
|
ei_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 */
|
ei_outb_p(ei_local->stop_page, e8390_base + EN0_STOPPG);
|
/* Clear the pending interrupts and mask. */
|
ei_outb_p(0xFF, e8390_base + EN0_ISR);
|
ei_outb_p(0x00, e8390_base + EN0_IMR);
|
|
/* Copy the station address into the DS8390 registers. */
|
|
ei_outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP, e8390_base+E8390_CMD); /* 0x61 */
|
for (i = 0; i < 6; i++) {
|
ei_outb_p(dev->dev_addr[i], e8390_base + EN1_PHYS_SHIFT(i));
|
if ((netif_msg_probe(ei_local)) &&
|
ei_inb_p(e8390_base + EN1_PHYS_SHIFT(i)) != dev->dev_addr[i])
|
netdev_err(dev,
|
"Hw. address read/write mismap %d\n", i);
|
}
|
|
ei_outb_p(ei_local->rx_start_page, e8390_base + EN1_CURPAG);
|
ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_STOP, e8390_base+E8390_CMD);
|
|
ei_local->tx1 = ei_local->tx2 = 0;
|
ei_local->txing = 0;
|
|
if (startp) {
|
ei_outb_p(0xff, e8390_base + EN0_ISR);
|
ei_outb_p(ENISR_ALL, e8390_base + EN0_IMR);
|
ei_outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, e8390_base+E8390_CMD);
|
ei_outb_p(E8390_TXCONFIG, e8390_base + EN0_TXCR); /* xmit on. */
|
/* 3c503 TechMan says rxconfig only after the NIC is started. */
|
ei_outb_p(E8390_RXCONFIG, e8390_base + EN0_RXCR); /* rx on, */
|
do_set_multicast_list(dev); /* (re)load the mcast table */
|
}
|
}
|
|
/* Trigger a transmit start, assuming the length is valid.
|
Always called with the page lock held */
|
|
static void NS8390_trigger_send(struct net_device *dev, unsigned int length,
|
int start_page)
|
{
|
unsigned long e8390_base = dev->base_addr;
|
struct ei_device *ei_local __attribute((unused)) = netdev_priv(dev);
|
|
ei_outb_p(E8390_NODMA+E8390_PAGE0, e8390_base+E8390_CMD);
|
|
if (ei_inb_p(e8390_base + E8390_CMD) & E8390_TRANS) {
|
netdev_warn(dev, "trigger_send() called with the transmitter busy\n");
|
return;
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}
|
ei_outb_p(length & 0xff, e8390_base + EN0_TCNTLO);
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ei_outb_p(length >> 8, e8390_base + EN0_TCNTHI);
|
ei_outb_p(start_page, e8390_base + EN0_TPSR);
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ei_outb_p(E8390_NODMA+E8390_TRANS+E8390_START, e8390_base+E8390_CMD);
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}
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