// SPDX-License-Identifier: GPL-1.0+ /*====================================================================== 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, [email protected]. Copyright (C) 2001 David A. Hinds -- [email protected] 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 [email protected] ======================================================================*/ #define pr_fmt(fmt) … #include <linux/kernel.h> #include <linux/module.h> #include <linux/ptrace.h> #include <linux/string.h> #include <linux/timer.h> #include <linux/delay.h> #include <linux/spinlock.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/crc32.h> #include <linux/mii.h> #include "8390.h" #include <pcmcia/cistpl.h> #include <pcmcia/ciscode.h> #include <pcmcia/ds.h> #include <pcmcia/cisreg.h> #include <asm/io.h> #include <asm/byteorder.h> #include <linux/uaccess.h> #define AXNET_CMD … #define AXNET_DATAPORT … #define AXNET_RESET … #define AXNET_MII_EEP … #define AXNET_TEST … #define AXNET_GPIO … #define AXNET_START_PG … #define AXNET_STOP_PG … #define AXNET_RDC_TIMEOUT … #define IS_AX88190 … #define IS_AX88790 … /*====================================================================*/ /* Module parameters */ MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; /*====================================================================*/ static int axnet_config(struct pcmcia_device *link); static void axnet_release(struct pcmcia_device *link); static int axnet_open(struct net_device *dev); static int axnet_close(struct net_device *dev); static int axnet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); static netdev_tx_t axnet_start_xmit(struct sk_buff *skb, struct net_device *dev); static struct net_device_stats *get_stats(struct net_device *dev); static void set_multicast_list(struct net_device *dev); static void axnet_tx_timeout(struct net_device *dev, unsigned int txqueue); static irqreturn_t ei_irq_wrapper(int irq, void *dev_id); static void ei_watchdog(struct timer_list *t); static void axnet_reset_8390(struct net_device *dev); static int mdio_read(unsigned int addr, int phy_id, int loc); static void mdio_write(unsigned int addr, int phy_id, int loc, int value); static void get_8390_hdr(struct net_device *, struct e8390_pkt_hdr *, int); static void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset); static void block_output(struct net_device *dev, int count, const u_char *buf, const int start_page); static void axnet_detach(struct pcmcia_device *p_dev); static void AX88190_init(struct net_device *dev, int startp); static int ax_open(struct net_device *dev); static int ax_close(struct net_device *dev); static irqreturn_t ax_interrupt(int irq, void *dev_id); /*====================================================================*/ struct axnet_dev { … }; static inline struct axnet_dev *PRIV(struct net_device *dev) { … } static const struct net_device_ops axnet_netdev_ops = …; static int axnet_probe(struct pcmcia_device *link) { … } /* axnet_attach */ static void axnet_detach(struct pcmcia_device *link) { … } /* axnet_detach */ /*====================================================================== This probes for a card's hardware address by reading the PROM. ======================================================================*/ static int get_prom(struct pcmcia_device *link) { … } /* get_prom */ static int try_io_port(struct pcmcia_device *link) { … } static int axnet_configcheck(struct pcmcia_device *p_dev, void *priv_data) { … } static int axnet_config(struct pcmcia_device *link) { … } /* axnet_config */ static void axnet_release(struct pcmcia_device *link) { … } static int axnet_suspend(struct pcmcia_device *link) { … } static int axnet_resume(struct pcmcia_device *link) { … } /*====================================================================== MII interface support ======================================================================*/ #define MDIO_SHIFT_CLK … #define MDIO_DATA_WRITE0 … #define MDIO_DATA_WRITE1 … #define MDIO_DATA_READ … #define MDIO_MASK … #define MDIO_ENB_IN … static void mdio_sync(unsigned int addr) { … } static int mdio_read(unsigned int addr, int phy_id, int loc) { … } static void mdio_write(unsigned int addr, int phy_id, int loc, int value) { … } /*====================================================================*/ static int axnet_open(struct net_device *dev) { … } /* axnet_open */ /*====================================================================*/ static int axnet_close(struct net_device *dev) { … } /* axnet_close */ /*====================================================================== Hard reset the card. This used to pause for the same period that a 8390 reset command required, but that shouldn't be necessary. ======================================================================*/ static void axnet_reset_8390(struct net_device *dev) { … } /* axnet_reset_8390 */ /*====================================================================*/ static irqreturn_t ei_irq_wrapper(int irq, void *dev_id) { … } static void ei_watchdog(struct timer_list *t) { … } /*====================================================================*/ static int axnet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) { … } /*====================================================================*/ static void get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page) { … } /*====================================================================*/ static void block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset) { … } /*====================================================================*/ static void block_output(struct net_device *dev, int count, const u_char *buf, const int start_page) { … } static const struct pcmcia_device_id axnet_ids[] = …; MODULE_DEVICE_TABLE(pcmcia, axnet_ids); static struct pcmcia_driver axnet_cs_driver = …; module_pcmcia_driver(…); /*====================================================================*/ /* 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 [email protected], 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. */ #include <linux/bitops.h> #include <asm/irq.h> #include <linux/fcntl.h> #include <linux/in.h> #include <linux/interrupt.h> #define BUG_83C690 /* 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 … #define ei_block_output … #define ei_block_input … #define ei_get_8390_hdr … /* Index to functions. */ static void ei_tx_intr(struct net_device *dev); static void ei_tx_err(struct net_device *dev); static void ei_receive(struct net_device *dev); static void ei_rx_overrun(struct net_device *dev); /* Routines generic to NS8390-based boards. */ static void NS8390_trigger_send(struct net_device *dev, unsigned int length, int start_page); static void 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. */ static int ax_open(struct net_device *dev) { … } #define dev_lock(dev) … /** * ax_close - shut down network device * @dev: network device to close * * Opposite of ax_open(). Only used when "ifconfig <devname> down" is done. */ static int ax_close(struct net_device *dev) { … } /** * 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. */ static void axnet_tx_timeout(struct net_device *dev, unsigned int txqueue) { … } /** * 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. */ static netdev_tx_t axnet_start_xmit(struct sk_buff *skb, struct net_device *dev) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /* * Collect the stats. This is called unlocked and from several contexts. */ static struct net_device_stats *get_stats(struct net_device *dev) { … } /* * 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) { … } /** * 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. */ static void do_set_multicast_list(struct net_device *dev) { … } /* * 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 set_multicast_list(struct net_device *dev) { … } /* 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. */ static void AX88190_init(struct net_device *dev, int startp) { … } /* 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) { … }
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