632 lines
18 KiB
C
632 lines
18 KiB
C
/* mac89x0.c: A Crystal Semiconductor CS89[02]0 driver for linux. */
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/*
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Written 1996 by Russell Nelson, with reference to skeleton.c
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written 1993-1994 by Donald Becker.
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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 at nelson@crynwr.com, Crynwr
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Software, 11 Grant St., Potsdam, NY 13676
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Changelog:
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Mike Cruse : mcruse@cti-ltd.com
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: Changes for Linux 2.0 compatibility.
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: Added dev_id parameter in net_interrupt(),
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: request_irq() and free_irq(). Just NULL for now.
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Mike Cruse : Added MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT macros
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: in net_open() and net_close() so kerneld would know
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: that the module is in use and wouldn't eject the
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: driver prematurely.
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Mike Cruse : Rewrote init_module() and cleanup_module using 8390.c
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: as an example. Disabled autoprobing in init_module(),
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: not a good thing to do to other devices while Linux
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: is running from all accounts.
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Alan Cox : Removed 1.2 support, added 2.1 extra counters.
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David Huggins-Daines <dhd@debian.org>
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Split this off into mac89x0.c, and gutted it of all parts which are
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not relevant to the existing CS8900 cards on the Macintosh
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(i.e. basically the Daynaport CS and LC cards). To be precise:
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* Removed all the media-detection stuff, because these cards are
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TP-only.
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* Lobotomized the ISA interrupt bogosity, because these cards use
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a hardwired NuBus interrupt and a magic ISAIRQ value in the card.
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* Basically eliminated everything not relevant to getting the
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cards minimally functioning on the Macintosh.
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I might add that these cards are badly designed even from the Mac
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standpoint, in that Dayna, in their infinite wisdom, used NuBus slot
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I/O space and NuBus interrupts for these cards, but neglected to
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provide anything even remotely resembling a NuBus ROM. Therefore we
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have to probe for them in a brain-damaged ISA-like fashion.
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Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
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check kmalloc and release the allocated memory on failure in
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mac89x0_probe and in init_module
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use local_irq_{save,restore}(flags) in net_get_stat, not just
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local_irq_{dis,en}able()
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*/
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static char *version =
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"cs89x0.c:v1.02 11/26/96 Russell Nelson <nelson@crynwr.com>\n";
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/* ======================= configure the driver here ======================= */
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/* use 0 for production, 1 for verification, >2 for debug */
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#ifndef NET_DEBUG
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#define NET_DEBUG 0
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#endif
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/* ======================= end of configuration ======================= */
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/* Always include 'config.h' first in case the user wants to turn on
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or override something. */
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#include <linux/module.h>
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/*
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Sources:
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Crynwr packet driver epktisa.
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Crystal Semiconductor data sheets.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/in.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/nubus.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/hwtest.h>
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#include <asm/macints.h>
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#include "cs89x0.h"
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static unsigned int net_debug = NET_DEBUG;
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/* Information that need to be kept for each board. */
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struct net_local {
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struct net_device_stats stats;
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int chip_type; /* one of: CS8900, CS8920, CS8920M */
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char chip_revision; /* revision letter of the chip ('A'...) */
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int send_cmd; /* the propercommand used to send a packet. */
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int rx_mode;
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int curr_rx_cfg;
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int send_underrun; /* keep track of how many underruns in a row we get */
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struct sk_buff *skb;
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};
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/* Index to functions, as function prototypes. */
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#if 0
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extern void reset_chip(struct net_device *dev);
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#endif
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static int net_open(struct net_device *dev);
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static int net_send_packet(struct sk_buff *skb, struct net_device *dev);
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static irqreturn_t net_interrupt(int irq, void *dev_id);
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static void set_multicast_list(struct net_device *dev);
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static void net_rx(struct net_device *dev);
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static int net_close(struct net_device *dev);
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static struct net_device_stats *net_get_stats(struct net_device *dev);
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static int set_mac_address(struct net_device *dev, void *addr);
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/* Example routines you must write ;->. */
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#define tx_done(dev) 1
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/* For reading/writing registers ISA-style */
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static inline int
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readreg_io(struct net_device *dev, int portno)
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{
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nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
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return swab16(nubus_readw(dev->base_addr + DATA_PORT));
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}
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static inline void
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writereg_io(struct net_device *dev, int portno, int value)
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{
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nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
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nubus_writew(swab16(value), dev->base_addr + DATA_PORT);
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}
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/* These are for reading/writing registers in shared memory */
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static inline int
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readreg(struct net_device *dev, int portno)
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{
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return swab16(nubus_readw(dev->mem_start + portno));
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}
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static inline void
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writereg(struct net_device *dev, int portno, int value)
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{
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nubus_writew(swab16(value), dev->mem_start + portno);
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}
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static const struct net_device_ops mac89x0_netdev_ops = {
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.ndo_open = net_open,
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.ndo_stop = net_close,
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.ndo_start_xmit = net_send_packet,
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.ndo_get_stats = net_get_stats,
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.ndo_set_multicast_list = set_multicast_list,
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.ndo_set_mac_address = set_mac_address,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_change_mtu = eth_change_mtu,
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};
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/* Probe for the CS8900 card in slot E. We won't bother looking
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anywhere else until we have a really good reason to do so. */
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struct net_device * __init mac89x0_probe(int unit)
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{
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struct net_device *dev;
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static int once_is_enough;
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struct net_local *lp;
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static unsigned version_printed;
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int i, slot;
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unsigned rev_type = 0;
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unsigned long ioaddr;
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unsigned short sig;
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int err = -ENODEV;
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if (!MACH_IS_MAC)
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return ERR_PTR(-ENODEV);
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dev = alloc_etherdev(sizeof(struct net_local));
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if (!dev)
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return ERR_PTR(-ENOMEM);
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if (unit >= 0) {
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sprintf(dev->name, "eth%d", unit);
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netdev_boot_setup_check(dev);
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}
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if (once_is_enough)
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goto out;
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once_is_enough = 1;
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/* We might have to parameterize this later */
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slot = 0xE;
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/* Get out now if there's a real NuBus card in slot E */
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if (nubus_find_slot(slot, NULL) != NULL)
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goto out;
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/* The pseudo-ISA bits always live at offset 0x300 (gee,
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wonder why...) */
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ioaddr = (unsigned long)
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nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE);
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{
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unsigned long flags;
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int card_present;
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local_irq_save(flags);
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card_present = hwreg_present((void*) ioaddr+4)
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&& hwreg_present((void*) ioaddr + DATA_PORT);
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local_irq_restore(flags);
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if (!card_present)
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goto out;
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}
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nubus_writew(0, ioaddr + ADD_PORT);
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sig = nubus_readw(ioaddr + DATA_PORT);
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if (sig != swab16(CHIP_EISA_ID_SIG))
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goto out;
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/* Initialize the net_device structure. */
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lp = netdev_priv(dev);
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/* Fill in the 'dev' fields. */
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dev->base_addr = ioaddr;
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dev->mem_start = (unsigned long)
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nubus_slot_addr(slot) | (((slot&0xf) << 20) + MMIOBASE);
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dev->mem_end = dev->mem_start + 0x1000;
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/* Turn on shared memory */
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writereg_io(dev, PP_BusCTL, MEMORY_ON);
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/* get the chip type */
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rev_type = readreg(dev, PRODUCT_ID_ADD);
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lp->chip_type = rev_type &~ REVISON_BITS;
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lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
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/* Check the chip type and revision in order to set the correct send command
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CS8920 revision C and CS8900 revision F can use the faster send. */
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lp->send_cmd = TX_AFTER_381;
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if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
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lp->send_cmd = TX_NOW;
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if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
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lp->send_cmd = TX_NOW;
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if (net_debug && version_printed++ == 0)
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printk(version);
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printk(KERN_INFO "%s: cs89%c0%s rev %c found at %#8lx",
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dev->name,
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lp->chip_type==CS8900?'0':'2',
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lp->chip_type==CS8920M?"M":"",
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lp->chip_revision,
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dev->base_addr);
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/* Try to read the MAC address */
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if ((readreg(dev, PP_SelfST) & (EEPROM_PRESENT | EEPROM_OK)) == 0) {
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printk("\nmac89x0: No EEPROM, giving up now.\n");
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goto out1;
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} else {
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for (i = 0; i < ETH_ALEN; i += 2) {
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/* Big-endian (why??!) */
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unsigned short s = readreg(dev, PP_IA + i);
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dev->dev_addr[i] = s >> 8;
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dev->dev_addr[i+1] = s & 0xff;
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}
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}
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dev->irq = SLOT2IRQ(slot);
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/* print the IRQ and ethernet address. */
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printk(" IRQ %d ADDR %pM\n", dev->irq, dev->dev_addr);
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dev->netdev_ops = &mac89x0_netdev_ops;
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err = register_netdev(dev);
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if (err)
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goto out1;
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return NULL;
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out1:
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nubus_writew(0, dev->base_addr + ADD_PORT);
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out:
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free_netdev(dev);
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return ERR_PTR(err);
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}
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#if 0
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/* This is useful for something, but I don't know what yet. */
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void __init reset_chip(struct net_device *dev)
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{
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int reset_start_time;
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writereg(dev, PP_SelfCTL, readreg(dev, PP_SelfCTL) | POWER_ON_RESET);
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/* wait 30 ms */
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msleep_interruptible(30);
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/* Wait until the chip is reset */
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reset_start_time = jiffies;
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while( (readreg(dev, PP_SelfST) & INIT_DONE) == 0 && jiffies - reset_start_time < 2)
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;
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}
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#endif
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/* Open/initialize the board. This is called (in the current kernel)
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sometime after booting when the 'ifconfig' program is run.
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This routine should set everything up anew at each open, even
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registers that "should" only need to be set once at boot, so that
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there is non-reboot way to recover if something goes wrong.
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*/
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static int
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net_open(struct net_device *dev)
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{
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struct net_local *lp = netdev_priv(dev);
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int i;
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/* Disable the interrupt for now */
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writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) & ~ENABLE_IRQ);
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/* Grab the interrupt */
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if (request_irq(dev->irq, &net_interrupt, 0, "cs89x0", dev))
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return -EAGAIN;
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/* Set up the IRQ - Apparently magic */
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if (lp->chip_type == CS8900)
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writereg(dev, PP_CS8900_ISAINT, 0);
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else
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writereg(dev, PP_CS8920_ISAINT, 0);
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/* set the Ethernet address */
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for (i=0; i < ETH_ALEN/2; i++)
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writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));
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/* Turn on both receive and transmit operations */
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writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);
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/* Receive only error free packets addressed to this card */
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lp->rx_mode = 0;
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writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);
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lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;
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writereg(dev, PP_RxCFG, lp->curr_rx_cfg);
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writereg(dev, PP_TxCFG, TX_LOST_CRS_ENBL | TX_SQE_ERROR_ENBL | TX_OK_ENBL |
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TX_LATE_COL_ENBL | TX_JBR_ENBL | TX_ANY_COL_ENBL | TX_16_COL_ENBL);
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writereg(dev, PP_BufCFG, READY_FOR_TX_ENBL | RX_MISS_COUNT_OVRFLOW_ENBL |
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TX_COL_COUNT_OVRFLOW_ENBL | TX_UNDERRUN_ENBL);
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/* now that we've got our act together, enable everything */
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writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
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netif_start_queue(dev);
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return 0;
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}
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static int
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net_send_packet(struct sk_buff *skb, struct net_device *dev)
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{
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struct net_local *lp = netdev_priv(dev);
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unsigned long flags;
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if (net_debug > 3)
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printk("%s: sent %d byte packet of type %x\n",
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dev->name, skb->len,
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(skb->data[ETH_ALEN+ETH_ALEN] << 8)
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| skb->data[ETH_ALEN+ETH_ALEN+1]);
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/* keep the upload from being interrupted, since we
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ask the chip to start transmitting before the
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whole packet has been completely uploaded. */
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local_irq_save(flags);
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netif_stop_queue(dev);
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/* initiate a transmit sequence */
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writereg(dev, PP_TxCMD, lp->send_cmd);
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writereg(dev, PP_TxLength, skb->len);
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/* Test to see if the chip has allocated memory for the packet */
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if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
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/* Gasp! It hasn't. But that shouldn't happen since
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we're waiting for TxOk, so return 1 and requeue this packet. */
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local_irq_restore(flags);
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return NETDEV_TX_BUSY;
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}
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/* Write the contents of the packet */
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skb_copy_from_linear_data(skb, (void *)(dev->mem_start + PP_TxFrame),
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skb->len+1);
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local_irq_restore(flags);
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dev->trans_start = jiffies;
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dev_kfree_skb (skb);
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return NETDEV_TX_OK;
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}
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/* The typical workload of the driver:
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Handle the network interface interrupts. */
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static irqreturn_t net_interrupt(int irq, void *dev_id)
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{
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struct net_device *dev = dev_id;
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struct net_local *lp;
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int ioaddr, status;
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if (dev == NULL) {
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printk ("net_interrupt(): irq %d for unknown device.\n", irq);
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return IRQ_NONE;
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}
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ioaddr = dev->base_addr;
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lp = netdev_priv(dev);
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/* we MUST read all the events out of the ISQ, otherwise we'll never
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get interrupted again. As a consequence, we can't have any limit
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on the number of times we loop in the interrupt handler. The
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hardware guarantees that eventually we'll run out of events. Of
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course, if you're on a slow machine, and packets are arriving
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faster than you can read them off, you're screwed. Hasta la
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vista, baby! */
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while ((status = swab16(nubus_readw(dev->base_addr + ISQ_PORT)))) {
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if (net_debug > 4)printk("%s: event=%04x\n", dev->name, status);
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switch(status & ISQ_EVENT_MASK) {
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case ISQ_RECEIVER_EVENT:
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/* Got a packet(s). */
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net_rx(dev);
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break;
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case ISQ_TRANSMITTER_EVENT:
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lp->stats.tx_packets++;
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netif_wake_queue(dev);
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if ((status & TX_OK) == 0) lp->stats.tx_errors++;
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if (status & TX_LOST_CRS) lp->stats.tx_carrier_errors++;
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if (status & TX_SQE_ERROR) lp->stats.tx_heartbeat_errors++;
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if (status & TX_LATE_COL) lp->stats.tx_window_errors++;
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if (status & TX_16_COL) lp->stats.tx_aborted_errors++;
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break;
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case ISQ_BUFFER_EVENT:
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if (status & READY_FOR_TX) {
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/* we tried to transmit a packet earlier,
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but inexplicably ran out of buffers.
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That shouldn't happen since we only ever
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load one packet. Shrug. Do the right
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thing anyway. */
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netif_wake_queue(dev);
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}
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if (status & TX_UNDERRUN) {
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if (net_debug > 0) printk("%s: transmit underrun\n", dev->name);
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lp->send_underrun++;
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if (lp->send_underrun == 3) lp->send_cmd = TX_AFTER_381;
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else if (lp->send_underrun == 6) lp->send_cmd = TX_AFTER_ALL;
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}
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break;
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case ISQ_RX_MISS_EVENT:
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lp->stats.rx_missed_errors += (status >>6);
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break;
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case ISQ_TX_COL_EVENT:
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lp->stats.collisions += (status >>6);
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break;
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}
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}
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return IRQ_HANDLED;
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}
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/* We have a good packet(s), get it/them out of the buffers. */
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static void
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net_rx(struct net_device *dev)
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{
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|
struct net_local *lp = netdev_priv(dev);
|
|
struct sk_buff *skb;
|
|
int status, length;
|
|
|
|
status = readreg(dev, PP_RxStatus);
|
|
if ((status & RX_OK) == 0) {
|
|
lp->stats.rx_errors++;
|
|
if (status & RX_RUNT) lp->stats.rx_length_errors++;
|
|
if (status & RX_EXTRA_DATA) lp->stats.rx_length_errors++;
|
|
if (status & RX_CRC_ERROR) if (!(status & (RX_EXTRA_DATA|RX_RUNT)))
|
|
/* per str 172 */
|
|
lp->stats.rx_crc_errors++;
|
|
if (status & RX_DRIBBLE) lp->stats.rx_frame_errors++;
|
|
return;
|
|
}
|
|
|
|
length = readreg(dev, PP_RxLength);
|
|
/* Malloc up new buffer. */
|
|
skb = alloc_skb(length, GFP_ATOMIC);
|
|
if (skb == NULL) {
|
|
printk("%s: Memory squeeze, dropping packet.\n", dev->name);
|
|
lp->stats.rx_dropped++;
|
|
return;
|
|
}
|
|
skb_put(skb, length);
|
|
|
|
skb_copy_to_linear_data(skb, (void *)(dev->mem_start + PP_RxFrame),
|
|
length);
|
|
|
|
if (net_debug > 3)printk("%s: received %d byte packet of type %x\n",
|
|
dev->name, length,
|
|
(skb->data[ETH_ALEN+ETH_ALEN] << 8)
|
|
| skb->data[ETH_ALEN+ETH_ALEN+1]);
|
|
|
|
skb->protocol=eth_type_trans(skb,dev);
|
|
netif_rx(skb);
|
|
lp->stats.rx_packets++;
|
|
lp->stats.rx_bytes += length;
|
|
}
|
|
|
|
/* The inverse routine to net_open(). */
|
|
static int
|
|
net_close(struct net_device *dev)
|
|
{
|
|
|
|
writereg(dev, PP_RxCFG, 0);
|
|
writereg(dev, PP_TxCFG, 0);
|
|
writereg(dev, PP_BufCFG, 0);
|
|
writereg(dev, PP_BusCTL, 0);
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
free_irq(dev->irq, dev);
|
|
|
|
/* Update the statistics here. */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* Get the current statistics. This may be called with the card open or
|
|
closed. */
|
|
static struct net_device_stats *
|
|
net_get_stats(struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
/* Update the statistics from the device registers. */
|
|
lp->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
|
|
lp->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
|
|
local_irq_restore(flags);
|
|
|
|
return &lp->stats;
|
|
}
|
|
|
|
static void set_multicast_list(struct net_device *dev)
|
|
{
|
|
struct net_local *lp = netdev_priv(dev);
|
|
|
|
if(dev->flags&IFF_PROMISC)
|
|
{
|
|
lp->rx_mode = RX_ALL_ACCEPT;
|
|
}
|
|
else if((dev->flags&IFF_ALLMULTI)||dev->mc_list)
|
|
{
|
|
/* The multicast-accept list is initialized to accept-all, and we
|
|
rely on higher-level filtering for now. */
|
|
lp->rx_mode = RX_MULTCAST_ACCEPT;
|
|
}
|
|
else
|
|
lp->rx_mode = 0;
|
|
|
|
writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);
|
|
|
|
/* in promiscuous mode, we accept errored packets, so we have to enable interrupts on them also */
|
|
writereg(dev, PP_RxCFG, lp->curr_rx_cfg |
|
|
(lp->rx_mode == RX_ALL_ACCEPT? (RX_CRC_ERROR_ENBL|RX_RUNT_ENBL|RX_EXTRA_DATA_ENBL) : 0));
|
|
}
|
|
|
|
|
|
static int set_mac_address(struct net_device *dev, void *addr)
|
|
{
|
|
int i;
|
|
printk("%s: Setting MAC address to ", dev->name);
|
|
for (i = 0; i < 6; i++)
|
|
printk(" %2.2x", dev->dev_addr[i] = ((unsigned char *)addr)[i]);
|
|
printk(".\n");
|
|
/* set the Ethernet address */
|
|
for (i=0; i < ETH_ALEN/2; i++)
|
|
writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef MODULE
|
|
|
|
static struct net_device *dev_cs89x0;
|
|
static int debug;
|
|
|
|
module_param(debug, int, 0);
|
|
MODULE_PARM_DESC(debug, "CS89[02]0 debug level (0-5)");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
int __init
|
|
init_module(void)
|
|
{
|
|
net_debug = debug;
|
|
dev_cs89x0 = mac89x0_probe(-1);
|
|
if (IS_ERR(dev_cs89x0)) {
|
|
printk(KERN_WARNING "mac89x0.c: No card found\n");
|
|
return PTR_ERR(dev_cs89x0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
cleanup_module(void)
|
|
{
|
|
unregister_netdev(dev_cs89x0);
|
|
nubus_writew(0, dev_cs89x0->base_addr + ADD_PORT);
|
|
free_netdev(dev_cs89x0);
|
|
}
|
|
#endif /* MODULE */
|