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c31f28e778
- Eliminate check for irq handler 'dev_id==NULL' where the condition never occurs. - Eliminate needless casts to/from void* Signed-off-by: Jeff Garzik <jeff@garzik.org>
942 lines
30 KiB
C
942 lines
30 KiB
C
/* znet.c: An Zenith Z-Note ethernet driver for linux. */
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/*
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Written by Donald Becker.
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The author may be reached as becker@scyld.com.
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This driver is based on the Linux skeleton driver. The copyright of the
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skeleton driver is held by the United States Government, as represented
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by DIRNSA, and it is released under the GPL.
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Thanks to Mike Hollick for alpha testing and suggestions.
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References:
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The Crynwr packet driver.
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"82593 CSMA/CD Core LAN Controller" Intel datasheet, 1992
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Intel Microcommunications Databook, Vol. 1, 1990.
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As usual with Intel, the documentation is incomplete and inaccurate.
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I had to read the Crynwr packet driver to figure out how to actually
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use the i82593, and guess at what register bits matched the loosely
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related i82586.
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Theory of Operation
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The i82593 used in the Zenith Z-Note series operates using two(!) slave
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DMA channels, one interrupt, and one 8-bit I/O port.
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While there several ways to configure '593 DMA system, I chose the one
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that seemed commensurate with the highest system performance in the face
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of moderate interrupt latency: Both DMA channels are configured as
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recirculating ring buffers, with one channel (#0) dedicated to Rx and
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the other channel (#1) to Tx and configuration. (Note that this is
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different than the Crynwr driver, where the Tx DMA channel is initialized
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before each operation. That approach simplifies operation and Tx error
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recovery, but requires additional I/O in normal operation and precludes
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transmit buffer chaining.)
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Both rings are set to 8192 bytes using {TX,RX}_RING_SIZE. This provides
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a reasonable ring size for Rx, while simplifying DMA buffer allocation --
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DMA buffers must not cross a 128K boundary. (In truth the size selection
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was influenced by my lack of '593 documentation. I thus was constrained
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to use the Crynwr '593 initialization table, which sets the Rx ring size
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to 8K.)
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Despite my usual low opinion about Intel-designed parts, I must admit
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that the bulk data handling of the i82593 is a good design for
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an integrated system, like a laptop, where using two slave DMA channels
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doesn't pose a problem. I still take issue with using only a single I/O
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port. In the same controlled environment there are essentially no
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limitations on I/O space, and using multiple locations would eliminate
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the need for multiple operations when looking at status registers,
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setting the Rx ring boundary, or switching to promiscuous mode.
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I also question Zenith's selection of the '593: one of the advertised
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advantages of earlier Intel parts was that if you figured out the magic
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initialization incantation you could use the same part on many different
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network types. Zenith's use of the "FriendlyNet" (sic) connector rather
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than an on-board transceiver leads me to believe that they were planning
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to take advantage of this. But, uhmmm, the '593 omits all but ethernet
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functionality from the serial subsystem.
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*/
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/* 10/2002
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o Resurected for Linux 2.5+ by Marc Zyngier <maz@wild-wind.fr.eu.org> :
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- Removed strange DMA snooping in znet_sent_packet, which lead to
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TX buffer corruption on my laptop.
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- Use init_etherdev stuff.
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- Use kmalloc-ed DMA buffers.
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- Use as few global variables as possible.
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- Use proper resources management.
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- Use wireless/i82593.h as much as possible (structure, constants)
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- Compiles as module or build-in.
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- Now survives unplugging/replugging cable.
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Some code was taken from wavelan_cs.
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Tested on a vintage Zenith Z-Note 433Lnp+. Probably broken on
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anything else. Testers (and detailed bug reports) are welcome :-).
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o TODO :
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- Properly handle multicast
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- Understand why some traffic patterns add a 1s latency...
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/delay.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/if_arp.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/dma.h>
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/* This include could be elsewhere, since it is not wireless specific */
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#include "wireless/i82593.h"
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static char version[] __initdata = "znet.c:v1.02 9/23/94 becker@scyld.com\n";
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#ifndef ZNET_DEBUG
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#define ZNET_DEBUG 1
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#endif
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static unsigned int znet_debug = ZNET_DEBUG;
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module_param (znet_debug, int, 0);
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MODULE_PARM_DESC (znet_debug, "ZNet debug level");
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MODULE_LICENSE("GPL");
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/* The DMA modes we need aren't in <dma.h>. */
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#define DMA_RX_MODE 0x14 /* Auto init, I/O to mem, ++, demand. */
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#define DMA_TX_MODE 0x18 /* Auto init, Mem to I/O, ++, demand. */
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#define dma_page_eq(ptr1, ptr2) ((long)(ptr1)>>17 == (long)(ptr2)>>17)
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#define RX_BUF_SIZE 8192
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#define TX_BUF_SIZE 8192
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#define DMA_BUF_SIZE (RX_BUF_SIZE + 16) /* 8k + 16 bytes for trailers */
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#define TX_TIMEOUT 10
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struct znet_private {
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int rx_dma, tx_dma;
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struct net_device_stats stats;
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spinlock_t lock;
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short sia_base, sia_size, io_size;
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struct i82593_conf_block i593_init;
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/* The starting, current, and end pointers for the packet buffers. */
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ushort *rx_start, *rx_cur, *rx_end;
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ushort *tx_start, *tx_cur, *tx_end;
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ushort tx_buf_len; /* Tx buffer length, in words. */
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};
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/* Only one can be built-in;-> */
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static struct net_device *znet_dev;
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struct netidblk {
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char magic[8]; /* The magic number (string) "NETIDBLK" */
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unsigned char netid[8]; /* The physical station address */
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char nettype, globalopt;
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char vendor[8]; /* The machine vendor and product name. */
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char product[8];
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char irq1, irq2; /* Interrupts, only one is currently used. */
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char dma1, dma2;
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short dma_mem_misc[8]; /* DMA buffer locations (unused in Linux). */
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short iobase1, iosize1;
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short iobase2, iosize2; /* Second iobase unused. */
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char driver_options; /* Misc. bits */
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char pad;
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};
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static int znet_open(struct net_device *dev);
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static int znet_send_packet(struct sk_buff *skb, struct net_device *dev);
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static irqreturn_t znet_interrupt(int irq, void *dev_id);
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static void znet_rx(struct net_device *dev);
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static int znet_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 void hardware_init(struct net_device *dev);
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static void update_stop_hit(short ioaddr, unsigned short rx_stop_offset);
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static void znet_tx_timeout (struct net_device *dev);
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/* Request needed resources */
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static int znet_request_resources (struct net_device *dev)
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{
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struct znet_private *znet = dev->priv;
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unsigned long flags;
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if (request_irq (dev->irq, &znet_interrupt, 0, "ZNet", dev))
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goto failed;
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if (request_dma (znet->rx_dma, "ZNet rx"))
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goto free_irq;
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if (request_dma (znet->tx_dma, "ZNet tx"))
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goto free_rx_dma;
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if (!request_region (znet->sia_base, znet->sia_size, "ZNet SIA"))
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goto free_tx_dma;
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if (!request_region (dev->base_addr, znet->io_size, "ZNet I/O"))
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goto free_sia;
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return 0; /* Happy ! */
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free_sia:
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release_region (znet->sia_base, znet->sia_size);
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free_tx_dma:
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flags = claim_dma_lock();
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free_dma (znet->tx_dma);
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release_dma_lock (flags);
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free_rx_dma:
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flags = claim_dma_lock();
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free_dma (znet->rx_dma);
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release_dma_lock (flags);
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free_irq:
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free_irq (dev->irq, dev);
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failed:
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return -1;
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}
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static void znet_release_resources (struct net_device *dev)
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{
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struct znet_private *znet = dev->priv;
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unsigned long flags;
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release_region (znet->sia_base, znet->sia_size);
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release_region (dev->base_addr, znet->io_size);
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flags = claim_dma_lock();
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free_dma (znet->tx_dma);
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free_dma (znet->rx_dma);
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release_dma_lock (flags);
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free_irq (dev->irq, dev);
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}
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/* Keep the magical SIA stuff in a single function... */
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static void znet_transceiver_power (struct net_device *dev, int on)
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{
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struct znet_private *znet = dev->priv;
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unsigned char v;
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/* Turn on/off the 82501 SIA, using zenith-specific magic. */
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/* Select LAN control register */
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outb(0x10, znet->sia_base);
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if (on)
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v = inb(znet->sia_base + 1) | 0x84;
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else
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v = inb(znet->sia_base + 1) & ~0x84;
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outb(v, znet->sia_base+1); /* Turn on/off LAN power (bit 2). */
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}
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/* Init the i82593, with current promisc/mcast configuration.
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Also used from hardware_init. */
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static void znet_set_multicast_list (struct net_device *dev)
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{
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struct znet_private *znet = dev->priv;
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short ioaddr = dev->base_addr;
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struct i82593_conf_block *cfblk = &znet->i593_init;
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memset(cfblk, 0x00, sizeof(struct i82593_conf_block));
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/* The configuration block. What an undocumented nightmare.
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The first set of values are those suggested (without explanation)
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for ethernet in the Intel 82586 databook. The rest appear to be
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completely undocumented, except for cryptic notes in the Crynwr
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packet driver. This driver uses the Crynwr values verbatim. */
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/* maz : Rewritten to take advantage of the wanvelan includes.
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At least we have names, not just blind values */
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/* Byte 0 */
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cfblk->fifo_limit = 10; /* = 16 B rx and 80 B tx fifo thresholds */
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cfblk->forgnesi = 0; /* 0=82C501, 1=AMD7992B compatibility */
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cfblk->fifo_32 = 1;
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cfblk->d6mod = 0; /* Run in i82593 advanced mode */
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cfblk->throttle_enb = 1;
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/* Byte 1 */
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cfblk->throttle = 8; /* Continuous w/interrupts, 128-clock DMA. */
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cfblk->cntrxint = 0; /* enable continuous mode receive interrupts */
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cfblk->contin = 1; /* enable continuous mode */
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/* Byte 2 */
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cfblk->addr_len = ETH_ALEN;
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cfblk->acloc = 1; /* Disable source addr insertion by i82593 */
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cfblk->preamb_len = 2; /* 8 bytes preamble */
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cfblk->loopback = 0; /* Loopback off */
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/* Byte 3 */
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cfblk->lin_prio = 0; /* Default priorities & backoff methods. */
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cfblk->tbofstop = 0;
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cfblk->exp_prio = 0;
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cfblk->bof_met = 0;
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/* Byte 4 */
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cfblk->ifrm_spc = 6; /* 96 bit times interframe spacing */
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/* Byte 5 */
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cfblk->slottim_low = 0; /* 512 bit times slot time (low) */
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/* Byte 6 */
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cfblk->slottim_hi = 2; /* 512 bit times slot time (high) */
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cfblk->max_retr = 15; /* 15 collisions retries */
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/* Byte 7 */
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cfblk->prmisc = ((dev->flags & IFF_PROMISC) ? 1 : 0); /* Promiscuous mode */
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cfblk->bc_dis = 0; /* Enable broadcast reception */
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cfblk->crs_1 = 0; /* Don't transmit without carrier sense */
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cfblk->nocrc_ins = 0; /* i82593 generates CRC */
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cfblk->crc_1632 = 0; /* 32-bit Autodin-II CRC */
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cfblk->crs_cdt = 0; /* CD not to be interpreted as CS */
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/* Byte 8 */
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cfblk->cs_filter = 0; /* CS is recognized immediately */
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cfblk->crs_src = 0; /* External carrier sense */
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cfblk->cd_filter = 0; /* CD is recognized immediately */
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/* Byte 9 */
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cfblk->min_fr_len = ETH_ZLEN >> 2; /* Minimum frame length */
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/* Byte A */
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cfblk->lng_typ = 1; /* Type/length checks OFF */
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cfblk->lng_fld = 1; /* Disable 802.3 length field check */
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cfblk->rxcrc_xf = 1; /* Don't transfer CRC to memory */
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cfblk->artx = 1; /* Disable automatic retransmission */
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cfblk->sarec = 1; /* Disable source addr trig of CD */
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cfblk->tx_jabber = 0; /* Disable jabber jam sequence */
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cfblk->hash_1 = 1; /* Use bits 0-5 in mc address hash */
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cfblk->lbpkpol = 0; /* Loopback pin active high */
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/* Byte B */
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cfblk->fdx = 0; /* Disable full duplex operation */
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/* Byte C */
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cfblk->dummy_6 = 0x3f; /* all ones, Default multicast addresses & backoff. */
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cfblk->mult_ia = 0; /* No multiple individual addresses */
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cfblk->dis_bof = 0; /* Disable the backoff algorithm ?! */
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/* Byte D */
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cfblk->dummy_1 = 1; /* set to 1 */
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cfblk->tx_ifs_retrig = 3; /* Hmm... Disabled */
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cfblk->mc_all = (dev->mc_list || (dev->flags&IFF_ALLMULTI));/* multicast all mode */
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cfblk->rcv_mon = 0; /* Monitor mode disabled */
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cfblk->frag_acpt = 0; /* Do not accept fragments */
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cfblk->tstrttrs = 0; /* No start transmission threshold */
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/* Byte E */
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cfblk->fretx = 1; /* FIFO automatic retransmission */
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cfblk->runt_eop = 0; /* drop "runt" packets */
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cfblk->hw_sw_pin = 0; /* ?? */
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cfblk->big_endn = 0; /* Big Endian ? no... */
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cfblk->syncrqs = 1; /* Synchronous DRQ deassertion... */
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cfblk->sttlen = 1; /* 6 byte status registers */
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cfblk->rx_eop = 0; /* Signal EOP on packet reception */
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cfblk->tx_eop = 0; /* Signal EOP on packet transmission */
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/* Byte F */
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cfblk->rbuf_size = RX_BUF_SIZE >> 12; /* Set receive buffer size */
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cfblk->rcvstop = 1; /* Enable Receive Stop Register */
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if (znet_debug > 2) {
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int i;
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unsigned char *c;
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for (i = 0, c = (char *) cfblk; i < sizeof (*cfblk); i++)
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printk ("%02X ", c[i]);
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printk ("\n");
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}
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*znet->tx_cur++ = sizeof(struct i82593_conf_block);
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memcpy(znet->tx_cur, cfblk, sizeof(struct i82593_conf_block));
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znet->tx_cur += sizeof(struct i82593_conf_block)/2;
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outb(OP0_CONFIGURE | CR0_CHNL, ioaddr);
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/* XXX FIXME maz : Add multicast addresses here, so having a
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* multicast address configured isn't equal to IFF_ALLMULTI */
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}
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/* The Z-Note probe is pretty easy. The NETIDBLK exists in the safe-to-probe
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BIOS area. We just scan for the signature, and pull the vital parameters
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out of the structure. */
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static int __init znet_probe (void)
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{
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int i;
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struct netidblk *netinfo;
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struct znet_private *znet;
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struct net_device *dev;
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char *p;
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int err = -ENOMEM;
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/* This code scans the region 0xf0000 to 0xfffff for a "NETIDBLK". */
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for(p = (char *)phys_to_virt(0xf0000); p < (char *)phys_to_virt(0x100000); p++)
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if (*p == 'N' && strncmp(p, "NETIDBLK", 8) == 0)
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break;
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if (p >= (char *)phys_to_virt(0x100000)) {
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if (znet_debug > 1)
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printk(KERN_INFO "No Z-Note ethernet adaptor found.\n");
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return -ENODEV;
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}
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dev = alloc_etherdev(sizeof(struct znet_private));
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if (!dev)
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return -ENOMEM;
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SET_MODULE_OWNER (dev);
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znet = dev->priv;
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netinfo = (struct netidblk *)p;
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dev->base_addr = netinfo->iobase1;
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dev->irq = netinfo->irq1;
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printk(KERN_INFO "%s: ZNET at %#3lx,", dev->name, dev->base_addr);
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/* The station address is in the "netidblk" at 0x0f0000. */
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for (i = 0; i < 6; i++)
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printk(" %2.2x", dev->dev_addr[i] = netinfo->netid[i]);
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printk(", using IRQ %d DMA %d and %d.\n", dev->irq, netinfo->dma1,
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netinfo->dma2);
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if (znet_debug > 1) {
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printk(KERN_INFO "%s: vendor '%16.16s' IRQ1 %d IRQ2 %d DMA1 %d DMA2 %d.\n",
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dev->name, netinfo->vendor,
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netinfo->irq1, netinfo->irq2,
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netinfo->dma1, netinfo->dma2);
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printk(KERN_INFO "%s: iobase1 %#x size %d iobase2 %#x size %d net type %2.2x.\n",
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dev->name, netinfo->iobase1, netinfo->iosize1,
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netinfo->iobase2, netinfo->iosize2, netinfo->nettype);
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}
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if (znet_debug > 0)
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printk(KERN_INFO "%s", version);
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znet->rx_dma = netinfo->dma1;
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znet->tx_dma = netinfo->dma2;
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spin_lock_init(&znet->lock);
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znet->sia_base = 0xe6; /* Magic address for the 82501 SIA */
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znet->sia_size = 2;
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/* maz: Despite the '593 being advertised above as using a
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* single 8bits I/O port, this driver does many 16bits
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* access. So set io_size accordingly */
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znet->io_size = 2;
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if (!(znet->rx_start = kmalloc (DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA)))
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goto free_dev;
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if (!(znet->tx_start = kmalloc (DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA)))
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goto free_rx;
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if (!dma_page_eq (znet->rx_start, znet->rx_start + (RX_BUF_SIZE/2-1)) ||
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!dma_page_eq (znet->tx_start, znet->tx_start + (TX_BUF_SIZE/2-1))) {
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printk (KERN_WARNING "tx/rx crossing DMA frontiers, giving up\n");
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goto free_tx;
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}
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znet->rx_end = znet->rx_start + RX_BUF_SIZE/2;
|
|
znet->tx_buf_len = TX_BUF_SIZE/2;
|
|
znet->tx_end = znet->tx_start + znet->tx_buf_len;
|
|
|
|
/* The ZNET-specific entries in the device structure. */
|
|
dev->open = &znet_open;
|
|
dev->hard_start_xmit = &znet_send_packet;
|
|
dev->stop = &znet_close;
|
|
dev->get_stats = net_get_stats;
|
|
dev->set_multicast_list = &znet_set_multicast_list;
|
|
dev->tx_timeout = znet_tx_timeout;
|
|
dev->watchdog_timeo = TX_TIMEOUT;
|
|
err = register_netdev(dev);
|
|
if (err)
|
|
goto free_tx;
|
|
znet_dev = dev;
|
|
return 0;
|
|
|
|
free_tx:
|
|
kfree(znet->tx_start);
|
|
free_rx:
|
|
kfree(znet->rx_start);
|
|
free_dev:
|
|
free_netdev(dev);
|
|
return err;
|
|
}
|
|
|
|
|
|
static int znet_open(struct net_device *dev)
|
|
{
|
|
int ioaddr = dev->base_addr;
|
|
|
|
if (znet_debug > 2)
|
|
printk(KERN_DEBUG "%s: znet_open() called.\n", dev->name);
|
|
|
|
/* These should never fail. You can't add devices to a sealed box! */
|
|
if (znet_request_resources (dev)) {
|
|
printk(KERN_WARNING "%s: Not opened -- resource busy?!?\n", dev->name);
|
|
return -EBUSY;
|
|
}
|
|
|
|
znet_transceiver_power (dev, 1);
|
|
|
|
/* According to the Crynwr driver we should wait 50 msec. for the
|
|
LAN clock to stabilize. My experiments indicates that the '593 can
|
|
be initialized immediately. The delay is probably needed for the
|
|
DC-to-DC converter to come up to full voltage, and for the oscillator
|
|
to be spot-on at 20Mhz before transmitting.
|
|
Until this proves to be a problem we rely on the higher layers for the
|
|
delay and save allocating a timer entry. */
|
|
|
|
/* maz : Well, I'm getting every time the following message
|
|
* without the delay on a 486@33. This machine is much too
|
|
* fast... :-) So maybe the Crynwr driver wasn't wrong after
|
|
* all, even if the message is completly harmless on my
|
|
* setup. */
|
|
mdelay (50);
|
|
|
|
/* This follows the packet driver's lead, and checks for success. */
|
|
if (inb(ioaddr) != 0x10 && inb(ioaddr) != 0x00)
|
|
printk(KERN_WARNING "%s: Problem turning on the transceiver power.\n",
|
|
dev->name);
|
|
|
|
hardware_init(dev);
|
|
netif_start_queue (dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void znet_tx_timeout (struct net_device *dev)
|
|
{
|
|
int ioaddr = dev->base_addr;
|
|
ushort event, tx_status, rx_offset, state;
|
|
|
|
outb (CR0_STATUS_0, ioaddr);
|
|
event = inb (ioaddr);
|
|
outb (CR0_STATUS_1, ioaddr);
|
|
tx_status = inw (ioaddr);
|
|
outb (CR0_STATUS_2, ioaddr);
|
|
rx_offset = inw (ioaddr);
|
|
outb (CR0_STATUS_3, ioaddr);
|
|
state = inb (ioaddr);
|
|
printk (KERN_WARNING "%s: transmit timed out, status %02x %04x %04x %02x,"
|
|
" resetting.\n", dev->name, event, tx_status, rx_offset, state);
|
|
if (tx_status == TX_LOST_CRS)
|
|
printk (KERN_WARNING "%s: Tx carrier error, check transceiver cable.\n",
|
|
dev->name);
|
|
outb (OP0_RESET, ioaddr);
|
|
hardware_init (dev);
|
|
netif_wake_queue (dev);
|
|
}
|
|
|
|
static int znet_send_packet(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
int ioaddr = dev->base_addr;
|
|
struct znet_private *znet = dev->priv;
|
|
unsigned long flags;
|
|
short length = skb->len;
|
|
|
|
if (znet_debug > 4)
|
|
printk(KERN_DEBUG "%s: ZNet_send_packet.\n", dev->name);
|
|
|
|
if (length < ETH_ZLEN) {
|
|
if (skb_padto(skb, ETH_ZLEN))
|
|
return 0;
|
|
length = ETH_ZLEN;
|
|
}
|
|
|
|
netif_stop_queue (dev);
|
|
|
|
/* Check that the part hasn't reset itself, probably from suspend. */
|
|
outb(CR0_STATUS_0, ioaddr);
|
|
if (inw(ioaddr) == 0x0010 &&
|
|
inw(ioaddr) == 0x0000 &&
|
|
inw(ioaddr) == 0x0010) {
|
|
if (znet_debug > 1)
|
|
printk (KERN_WARNING "%s : waking up\n", dev->name);
|
|
hardware_init(dev);
|
|
znet_transceiver_power (dev, 1);
|
|
}
|
|
|
|
if (1) {
|
|
unsigned char *buf = (void *)skb->data;
|
|
ushort *tx_link = znet->tx_cur - 1;
|
|
ushort rnd_len = (length + 1)>>1;
|
|
|
|
znet->stats.tx_bytes+=length;
|
|
|
|
if (znet->tx_cur >= znet->tx_end)
|
|
znet->tx_cur = znet->tx_start;
|
|
*znet->tx_cur++ = length;
|
|
if (znet->tx_cur + rnd_len + 1 > znet->tx_end) {
|
|
int semi_cnt = (znet->tx_end - znet->tx_cur)<<1; /* Cvrt to byte cnt. */
|
|
memcpy(znet->tx_cur, buf, semi_cnt);
|
|
rnd_len -= semi_cnt>>1;
|
|
memcpy(znet->tx_start, buf + semi_cnt, length - semi_cnt);
|
|
znet->tx_cur = znet->tx_start + rnd_len;
|
|
} else {
|
|
memcpy(znet->tx_cur, buf, skb->len);
|
|
znet->tx_cur += rnd_len;
|
|
}
|
|
*znet->tx_cur++ = 0;
|
|
|
|
spin_lock_irqsave(&znet->lock, flags);
|
|
{
|
|
*tx_link = OP0_TRANSMIT | CR0_CHNL;
|
|
/* Is this always safe to do? */
|
|
outb(OP0_TRANSMIT | CR0_CHNL, ioaddr);
|
|
}
|
|
spin_unlock_irqrestore (&znet->lock, flags);
|
|
|
|
dev->trans_start = jiffies;
|
|
netif_start_queue (dev);
|
|
|
|
if (znet_debug > 4)
|
|
printk(KERN_DEBUG "%s: Transmitter queued, length %d.\n", dev->name, length);
|
|
}
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/* The ZNET interrupt handler. */
|
|
static irqreturn_t znet_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct net_device *dev = dev_id;
|
|
struct znet_private *znet = dev->priv;
|
|
int ioaddr;
|
|
int boguscnt = 20;
|
|
int handled = 0;
|
|
|
|
spin_lock (&znet->lock);
|
|
|
|
ioaddr = dev->base_addr;
|
|
|
|
outb(CR0_STATUS_0, ioaddr);
|
|
do {
|
|
ushort status = inb(ioaddr);
|
|
if (znet_debug > 5) {
|
|
ushort result, rx_ptr, running;
|
|
outb(CR0_STATUS_1, ioaddr);
|
|
result = inw(ioaddr);
|
|
outb(CR0_STATUS_2, ioaddr);
|
|
rx_ptr = inw(ioaddr);
|
|
outb(CR0_STATUS_3, ioaddr);
|
|
running = inb(ioaddr);
|
|
printk(KERN_DEBUG "%s: interrupt, status %02x, %04x %04x %02x serial %d.\n",
|
|
dev->name, status, result, rx_ptr, running, boguscnt);
|
|
}
|
|
if ((status & SR0_INTERRUPT) == 0)
|
|
break;
|
|
|
|
handled = 1;
|
|
|
|
if ((status & SR0_EVENT_MASK) == SR0_TRANSMIT_DONE ||
|
|
(status & SR0_EVENT_MASK) == SR0_RETRANSMIT_DONE ||
|
|
(status & SR0_EVENT_MASK) == SR0_TRANSMIT_NO_CRC_DONE) {
|
|
int tx_status;
|
|
outb(CR0_STATUS_1, ioaddr);
|
|
tx_status = inw(ioaddr);
|
|
/* It's undocumented, but tx_status seems to match the i82586. */
|
|
if (tx_status & TX_OK) {
|
|
znet->stats.tx_packets++;
|
|
znet->stats.collisions += tx_status & TX_NCOL_MASK;
|
|
} else {
|
|
if (tx_status & (TX_LOST_CTS | TX_LOST_CRS))
|
|
znet->stats.tx_carrier_errors++;
|
|
if (tx_status & TX_UND_RUN)
|
|
znet->stats.tx_fifo_errors++;
|
|
if (!(tx_status & TX_HRT_BEAT))
|
|
znet->stats.tx_heartbeat_errors++;
|
|
if (tx_status & TX_MAX_COL)
|
|
znet->stats.tx_aborted_errors++;
|
|
/* ...and the catch-all. */
|
|
if ((tx_status | (TX_LOST_CRS | TX_LOST_CTS | TX_UND_RUN | TX_HRT_BEAT | TX_MAX_COL)) != (TX_LOST_CRS | TX_LOST_CTS | TX_UND_RUN | TX_HRT_BEAT | TX_MAX_COL))
|
|
znet->stats.tx_errors++;
|
|
|
|
/* Transceiver may be stuck if cable
|
|
* was removed while emiting a
|
|
* packet. Flip it off, then on to
|
|
* reset it. This is very empirical,
|
|
* but it seems to work. */
|
|
|
|
znet_transceiver_power (dev, 0);
|
|
znet_transceiver_power (dev, 1);
|
|
}
|
|
netif_wake_queue (dev);
|
|
}
|
|
|
|
if ((status & SR0_RECEPTION) ||
|
|
(status & SR0_EVENT_MASK) == SR0_STOP_REG_HIT) {
|
|
znet_rx(dev);
|
|
}
|
|
/* Clear the interrupts we've handled. */
|
|
outb(CR0_INT_ACK, ioaddr);
|
|
} while (boguscnt--);
|
|
|
|
spin_unlock (&znet->lock);
|
|
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
static void znet_rx(struct net_device *dev)
|
|
{
|
|
struct znet_private *znet = dev->priv;
|
|
int ioaddr = dev->base_addr;
|
|
int boguscount = 1;
|
|
short next_frame_end_offset = 0; /* Offset of next frame start. */
|
|
short *cur_frame_end;
|
|
short cur_frame_end_offset;
|
|
|
|
outb(CR0_STATUS_2, ioaddr);
|
|
cur_frame_end_offset = inw(ioaddr);
|
|
|
|
if (cur_frame_end_offset == znet->rx_cur - znet->rx_start) {
|
|
printk(KERN_WARNING "%s: Interrupted, but nothing to receive, offset %03x.\n",
|
|
dev->name, cur_frame_end_offset);
|
|
return;
|
|
}
|
|
|
|
/* Use same method as the Crynwr driver: construct a forward list in
|
|
the same area of the backwards links we now have. This allows us to
|
|
pass packets to the upper layers in the order they were received --
|
|
important for fast-path sequential operations. */
|
|
while (znet->rx_start + cur_frame_end_offset != znet->rx_cur
|
|
&& ++boguscount < 5) {
|
|
unsigned short hi_cnt, lo_cnt, hi_status, lo_status;
|
|
int count, status;
|
|
|
|
if (cur_frame_end_offset < 4) {
|
|
/* Oh no, we have a special case: the frame trailer wraps around
|
|
the end of the ring buffer. We've saved space at the end of
|
|
the ring buffer for just this problem. */
|
|
memcpy(znet->rx_end, znet->rx_start, 8);
|
|
cur_frame_end_offset += (RX_BUF_SIZE/2);
|
|
}
|
|
cur_frame_end = znet->rx_start + cur_frame_end_offset - 4;
|
|
|
|
lo_status = *cur_frame_end++;
|
|
hi_status = *cur_frame_end++;
|
|
status = ((hi_status & 0xff) << 8) + (lo_status & 0xff);
|
|
lo_cnt = *cur_frame_end++;
|
|
hi_cnt = *cur_frame_end++;
|
|
count = ((hi_cnt & 0xff) << 8) + (lo_cnt & 0xff);
|
|
|
|
if (znet_debug > 5)
|
|
printk(KERN_DEBUG "Constructing trailer at location %03x, %04x %04x %04x %04x"
|
|
" count %#x status %04x.\n",
|
|
cur_frame_end_offset<<1, lo_status, hi_status, lo_cnt, hi_cnt,
|
|
count, status);
|
|
cur_frame_end[-4] = status;
|
|
cur_frame_end[-3] = next_frame_end_offset;
|
|
cur_frame_end[-2] = count;
|
|
next_frame_end_offset = cur_frame_end_offset;
|
|
cur_frame_end_offset -= ((count + 1)>>1) + 3;
|
|
if (cur_frame_end_offset < 0)
|
|
cur_frame_end_offset += RX_BUF_SIZE/2;
|
|
};
|
|
|
|
/* Now step forward through the list. */
|
|
do {
|
|
ushort *this_rfp_ptr = znet->rx_start + next_frame_end_offset;
|
|
int status = this_rfp_ptr[-4];
|
|
int pkt_len = this_rfp_ptr[-2];
|
|
|
|
if (znet_debug > 5)
|
|
printk(KERN_DEBUG "Looking at trailer ending at %04x status %04x length %03x"
|
|
" next %04x.\n", next_frame_end_offset<<1, status, pkt_len,
|
|
this_rfp_ptr[-3]<<1);
|
|
/* Once again we must assume that the i82586 docs apply. */
|
|
if ( ! (status & RX_RCV_OK)) { /* There was an error. */
|
|
znet->stats.rx_errors++;
|
|
if (status & RX_CRC_ERR) znet->stats.rx_crc_errors++;
|
|
if (status & RX_ALG_ERR) znet->stats.rx_frame_errors++;
|
|
#if 0
|
|
if (status & 0x0200) znet->stats.rx_over_errors++; /* Wrong. */
|
|
if (status & 0x0100) znet->stats.rx_fifo_errors++;
|
|
#else
|
|
/* maz : Wild guess... */
|
|
if (status & RX_OVRRUN) znet->stats.rx_over_errors++;
|
|
#endif
|
|
if (status & RX_SRT_FRM) znet->stats.rx_length_errors++;
|
|
} else if (pkt_len > 1536) {
|
|
znet->stats.rx_length_errors++;
|
|
} else {
|
|
/* Malloc up new buffer. */
|
|
struct sk_buff *skb;
|
|
|
|
skb = dev_alloc_skb(pkt_len);
|
|
if (skb == NULL) {
|
|
if (znet_debug)
|
|
printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name);
|
|
znet->stats.rx_dropped++;
|
|
break;
|
|
}
|
|
skb->dev = dev;
|
|
|
|
if (&znet->rx_cur[(pkt_len+1)>>1] > znet->rx_end) {
|
|
int semi_cnt = (znet->rx_end - znet->rx_cur)<<1;
|
|
memcpy(skb_put(skb,semi_cnt), znet->rx_cur, semi_cnt);
|
|
memcpy(skb_put(skb,pkt_len-semi_cnt), znet->rx_start,
|
|
pkt_len - semi_cnt);
|
|
} else {
|
|
memcpy(skb_put(skb,pkt_len), znet->rx_cur, pkt_len);
|
|
if (znet_debug > 6) {
|
|
unsigned int *packet = (unsigned int *) skb->data;
|
|
printk(KERN_DEBUG "Packet data is %08x %08x %08x %08x.\n", packet[0],
|
|
packet[1], packet[2], packet[3]);
|
|
}
|
|
}
|
|
skb->protocol=eth_type_trans(skb,dev);
|
|
netif_rx(skb);
|
|
dev->last_rx = jiffies;
|
|
znet->stats.rx_packets++;
|
|
znet->stats.rx_bytes += pkt_len;
|
|
}
|
|
znet->rx_cur = this_rfp_ptr;
|
|
if (znet->rx_cur >= znet->rx_end)
|
|
znet->rx_cur -= RX_BUF_SIZE/2;
|
|
update_stop_hit(ioaddr, (znet->rx_cur - znet->rx_start)<<1);
|
|
next_frame_end_offset = this_rfp_ptr[-3];
|
|
if (next_frame_end_offset == 0) /* Read all the frames? */
|
|
break; /* Done for now */
|
|
this_rfp_ptr = znet->rx_start + next_frame_end_offset;
|
|
} while (--boguscount);
|
|
|
|
/* If any worth-while packets have been received, dev_rint()
|
|
has done a mark_bh(INET_BH) for us and will work on them
|
|
when we get to the bottom-half routine. */
|
|
return;
|
|
}
|
|
|
|
/* The inverse routine to znet_open(). */
|
|
static int znet_close(struct net_device *dev)
|
|
{
|
|
int ioaddr = dev->base_addr;
|
|
|
|
netif_stop_queue (dev);
|
|
|
|
outb(OP0_RESET, ioaddr); /* CMD0_RESET */
|
|
|
|
if (znet_debug > 1)
|
|
printk(KERN_DEBUG "%s: Shutting down ethercard.\n", dev->name);
|
|
/* Turn off transceiver power. */
|
|
znet_transceiver_power (dev, 0);
|
|
|
|
znet_release_resources (dev);
|
|
|
|
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 znet_private *znet = dev->priv;
|
|
|
|
return &znet->stats;
|
|
}
|
|
|
|
static void show_dma(struct net_device *dev)
|
|
{
|
|
short ioaddr = dev->base_addr;
|
|
unsigned char stat = inb (ioaddr);
|
|
struct znet_private *znet = dev->priv;
|
|
unsigned long flags;
|
|
short dma_port = ((znet->tx_dma&3)<<2) + IO_DMA2_BASE;
|
|
unsigned addr = inb(dma_port);
|
|
short residue;
|
|
|
|
addr |= inb(dma_port) << 8;
|
|
residue = get_dma_residue(znet->tx_dma);
|
|
|
|
if (znet_debug > 1) {
|
|
flags=claim_dma_lock();
|
|
printk(KERN_DEBUG "Stat:%02x Addr: %04x cnt:%3x\n",
|
|
stat, addr<<1, residue);
|
|
release_dma_lock(flags);
|
|
}
|
|
}
|
|
|
|
/* Initialize the hardware. We have to do this when the board is open()ed
|
|
or when we come out of suspend mode. */
|
|
static void hardware_init(struct net_device *dev)
|
|
{
|
|
unsigned long flags;
|
|
short ioaddr = dev->base_addr;
|
|
struct znet_private *znet = dev->priv;
|
|
|
|
znet->rx_cur = znet->rx_start;
|
|
znet->tx_cur = znet->tx_start;
|
|
|
|
/* Reset the chip, and start it up. */
|
|
outb(OP0_RESET, ioaddr);
|
|
|
|
flags=claim_dma_lock();
|
|
disable_dma(znet->rx_dma); /* reset by an interrupting task. */
|
|
clear_dma_ff(znet->rx_dma);
|
|
set_dma_mode(znet->rx_dma, DMA_RX_MODE);
|
|
set_dma_addr(znet->rx_dma, (unsigned int) znet->rx_start);
|
|
set_dma_count(znet->rx_dma, RX_BUF_SIZE);
|
|
enable_dma(znet->rx_dma);
|
|
/* Now set up the Tx channel. */
|
|
disable_dma(znet->tx_dma);
|
|
clear_dma_ff(znet->tx_dma);
|
|
set_dma_mode(znet->tx_dma, DMA_TX_MODE);
|
|
set_dma_addr(znet->tx_dma, (unsigned int) znet->tx_start);
|
|
set_dma_count(znet->tx_dma, znet->tx_buf_len<<1);
|
|
enable_dma(znet->tx_dma);
|
|
release_dma_lock(flags);
|
|
|
|
if (znet_debug > 1)
|
|
printk(KERN_DEBUG "%s: Initializing the i82593, rx buf %p tx buf %p\n",
|
|
dev->name, znet->rx_start,znet->tx_start);
|
|
/* Do an empty configure command, just like the Crynwr driver. This
|
|
resets to chip to its default values. */
|
|
*znet->tx_cur++ = 0;
|
|
*znet->tx_cur++ = 0;
|
|
show_dma(dev);
|
|
outb(OP0_CONFIGURE | CR0_CHNL, ioaddr);
|
|
|
|
znet_set_multicast_list (dev);
|
|
|
|
*znet->tx_cur++ = 6;
|
|
memcpy(znet->tx_cur, dev->dev_addr, 6);
|
|
znet->tx_cur += 3;
|
|
show_dma(dev);
|
|
outb(OP0_IA_SETUP | CR0_CHNL, ioaddr);
|
|
show_dma(dev);
|
|
|
|
update_stop_hit(ioaddr, 8192);
|
|
if (znet_debug > 1) printk(KERN_DEBUG "enabling Rx.\n");
|
|
outb(OP0_RCV_ENABLE, ioaddr);
|
|
netif_start_queue (dev);
|
|
}
|
|
|
|
static void update_stop_hit(short ioaddr, unsigned short rx_stop_offset)
|
|
{
|
|
outb(OP0_SWIT_TO_PORT_1 | CR0_CHNL, ioaddr);
|
|
if (znet_debug > 5)
|
|
printk(KERN_DEBUG "Updating stop hit with value %02x.\n",
|
|
(rx_stop_offset >> 6) | CR1_STOP_REG_UPDATE);
|
|
outb((rx_stop_offset >> 6) | CR1_STOP_REG_UPDATE, ioaddr);
|
|
outb(OP1_SWIT_TO_PORT_0, ioaddr);
|
|
}
|
|
|
|
static __exit void znet_cleanup (void)
|
|
{
|
|
if (znet_dev) {
|
|
struct znet_private *znet = znet_dev->priv;
|
|
|
|
unregister_netdev (znet_dev);
|
|
kfree (znet->rx_start);
|
|
kfree (znet->tx_start);
|
|
free_netdev (znet_dev);
|
|
}
|
|
}
|
|
|
|
module_init (znet_probe);
|
|
module_exit (znet_cleanup);
|