![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
One less thing for drivers writers to worry about. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
674 lines
18 KiB
C
674 lines
18 KiB
C
/* bionet.c BioNet-100 device driver for linux68k.
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*
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* Version: @(#)bionet.c 1.0 02/06/96
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*
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* Author: Hartmut Laue <laue@ifk-mp.uni-kiel.de>
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* and Torsten Narjes <narjes@ifk-mp.uni-kiel.de>
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*
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* Little adaptions for integration into pl7 by Roman Hodek
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*
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* Some changes in bionet_poll_rx by Karl-Heinz Lohner
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*
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What is it ?
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------------
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This driver controls the BIONET-100 LAN-Adapter which connects
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an ATARI ST/TT via the ACSI-port to an Ethernet-based network.
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This version can be compiled as a loadable module (See the
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compile command at the bottom of this file).
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At load time, you can optionally set the debugging level and the
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fastest response time on the command line of 'insmod'.
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'bionet_debug'
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controls the amount of diagnostic messages:
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0 : no messages
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>0 : see code for meaning of printed messages
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'bionet_min_poll_time' (always >=1)
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gives the time (in jiffies) between polls. Low values
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increase the system load (beware!)
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When loaded, a net device with the name 'bio0' becomes available,
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which can be controlled with the usual 'ifconfig' command.
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It is possible to compile this driver into the kernel like other
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(net) drivers. For this purpose, some source files (e.g. config-files
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makefiles, Space.c) must be changed accordingly. (You may refer to
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other drivers how to do it.) In this case, the device will be detected
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at boot time and (probably) appear as 'eth0'.
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This code is based on several sources:
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- The driver code for a parallel port ethernet adapter by
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Donald Becker (see file 'atp.c' from the PC linux distribution)
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- The ACSI code by Roman Hodek for the ATARI-ACSI harddisk support
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and DMA handling.
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- Very limited information about moving packets in and out of the
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BIONET-adapter from the TCP package for TOS by BioData GmbH.
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Theory of Operation
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-------------------
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Because the ATARI DMA port is usually shared between several
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devices (eg. harddisk, floppy) we cannot block the ACSI bus
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while waiting for interrupts. Therefore we use a polling mechanism
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to fetch packets from the adapter. For the same reason, we send
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packets without checking that the previous packet has been sent to
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the LAN. We rely on the higher levels of the networking code to detect
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missing packets and resend them.
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Before we access the ATARI DMA controller, we check if another
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process is using the DMA. If not, we lock the DMA, perform one or
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more packet transfers and unlock the DMA before returning.
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We do not use 'stdma_lock' unconditionally because it is unclear
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if the networking code can be set to sleep, which will happen if
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another (possibly slow) device is using the DMA controller.
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The polling is done via timer interrupts which periodically
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'simulate' an interrupt from the Ethernet adapter. The time (in jiffies)
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between polls varies depending on an estimate of the net activity.
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The allowed range is given by the variable 'bionet_min_poll_time'
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for the lower (fastest) limit and the constant 'MAX_POLL_TIME'
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for the higher (slowest) limit.
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Whenever a packet arrives, we switch to fastest response by setting
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the polling time to its lowest limit. If the following poll fails,
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because no packets have arrived, we increase the time for the next
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poll. When the net activity is low, the polling time effectively
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stays at its maximum value, resulting in the lowest load for the
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machine.
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*/
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#define MAX_POLL_TIME 10
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static char version[] =
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"bionet.c:v1.0 06-feb-96 (c) Hartmut Laue.\n";
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.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/delay.h>
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#include <linux/timer.h>
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#include <linux/init.h>
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#include <linux/bitops.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 <asm/setup.h>
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#include <asm/pgtable.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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#include <asm/atarihw.h>
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#include <asm/atariints.h>
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#include <asm/atari_acsi.h>
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#include <asm/atari_stdma.h>
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/* use 0 for production, 1 for verification, >2 for debug
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*/
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#ifndef NET_DEBUG
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#define NET_DEBUG 0
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#endif
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/*
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* Global variable 'bionet_debug'. Can be set at load time by 'insmod'
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*/
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unsigned int bionet_debug = NET_DEBUG;
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module_param(bionet_debug, int, 0);
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MODULE_PARM_DESC(bionet_debug, "bionet debug level (0-2)");
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MODULE_LICENSE("GPL");
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static unsigned int bionet_min_poll_time = 2;
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/* Information that need to be kept for each board.
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*/
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struct net_local {
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struct net_device_stats stats;
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long open_time; /* for debugging */
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int poll_time; /* polling time varies with net load */
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};
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static struct nic_pkt_s { /* packet format */
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unsigned char status;
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unsigned char dummy;
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unsigned char l_lo, l_hi;
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unsigned char buffer[3000];
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} *nic_packet;
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unsigned char *phys_nic_packet;
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/* Index to functions, as function prototypes.
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*/
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static int bionet_open(struct net_device *dev);
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static int bionet_send_packet(struct sk_buff *skb, struct net_device *dev);
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static void bionet_poll_rx(struct net_device *);
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static int bionet_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 bionet_tick(unsigned long);
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static DEFINE_TIMER(bionet_timer, bionet_tick, 0, 0);
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#define STRAM_ADDR(a) (((a) & 0xff000000) == 0)
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/* The following routines access the ethernet board connected to the
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* ACSI port via the st_dma chip.
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*/
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#define NODE_ADR 0x60
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#define C_READ 8
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#define C_WRITE 0x0a
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#define C_GETEA 0x0f
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#define C_SETCR 0x0e
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static int
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sendcmd(unsigned int a0, unsigned int mod, unsigned int cmd) {
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unsigned int c;
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dma_wd.dma_mode_status = (mod | ((a0) ? 2 : 0) | 0x88);
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dma_wd.fdc_acces_seccount = cmd;
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dma_wd.dma_mode_status = (mod | 0x8a);
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if( !acsi_wait_for_IRQ(HZ/2) ) /* wait for cmd ack */
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return -1; /* timeout */
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c = dma_wd.fdc_acces_seccount;
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return (c & 0xff);
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}
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static void
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set_status(int cr) {
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sendcmd(0,0x100,NODE_ADR | C_SETCR); /* CMD: SET CR */
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sendcmd(1,0x100,cr);
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dma_wd.dma_mode_status = 0x80;
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}
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static int
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get_status(unsigned char *adr) {
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int i,c;
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DISABLE_IRQ();
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c = sendcmd(0,0x00,NODE_ADR | C_GETEA); /* CMD: GET ETH ADR*/
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if( c < 0 ) goto gsend;
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/* now read status bytes */
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for (i=0; i<6; i++) {
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dma_wd.fdc_acces_seccount = 0; /* request next byte */
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if( !acsi_wait_for_IRQ(HZ/2) ) { /* wait for cmd ack */
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c = -1;
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goto gsend; /* timeout */
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}
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c = dma_wd.fdc_acces_seccount;
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*adr++ = (unsigned char)c;
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}
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c = 1;
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gsend:
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dma_wd.dma_mode_status = 0x80;
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return c;
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}
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static irqreturn_t
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bionet_intr(int irq, void *data) {
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return IRQ_HANDLED;
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}
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static int
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get_frame(unsigned long paddr, int odd) {
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int c;
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unsigned long flags;
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DISABLE_IRQ();
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local_irq_save(flags);
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dma_wd.dma_mode_status = 0x9a;
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dma_wd.dma_mode_status = 0x19a;
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dma_wd.dma_mode_status = 0x9a;
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dma_wd.fdc_acces_seccount = 0x04; /* sector count (was 5) */
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dma_wd.dma_lo = (unsigned char)paddr;
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paddr >>= 8;
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dma_wd.dma_md = (unsigned char)paddr;
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paddr >>= 8;
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dma_wd.dma_hi = (unsigned char)paddr;
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local_irq_restore(flags);
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c = sendcmd(0,0x00,NODE_ADR | C_READ); /* CMD: READ */
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if( c < 128 ) goto rend;
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/* now read block */
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c = sendcmd(1,0x00,odd); /* odd flag for address shift */
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dma_wd.dma_mode_status = 0x0a;
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if( !acsi_wait_for_IRQ(100) ) { /* wait for DMA to complete */
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c = -1;
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goto rend;
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}
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dma_wd.dma_mode_status = 0x8a;
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dma_wd.dma_mode_status = 0x18a;
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dma_wd.dma_mode_status = 0x8a;
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c = dma_wd.fdc_acces_seccount;
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dma_wd.dma_mode_status = 0x88;
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c = dma_wd.fdc_acces_seccount;
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c = 1;
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rend:
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dma_wd.dma_mode_status = 0x80;
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udelay(40);
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acsi_wait_for_noIRQ(20);
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return c;
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}
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static int
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hardware_send_packet(unsigned long paddr, int cnt) {
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unsigned int c;
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unsigned long flags;
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DISABLE_IRQ();
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local_irq_save(flags);
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dma_wd.dma_mode_status = 0x19a;
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dma_wd.dma_mode_status = 0x9a;
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dma_wd.dma_mode_status = 0x19a;
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dma_wd.dma_lo = (unsigned char)paddr;
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paddr >>= 8;
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dma_wd.dma_md = (unsigned char)paddr;
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paddr >>= 8;
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dma_wd.dma_hi = (unsigned char)paddr;
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dma_wd.fdc_acces_seccount = 0x4; /* sector count */
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local_irq_restore(flags);
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c = sendcmd(0,0x100,NODE_ADR | C_WRITE); /* CMD: WRITE */
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c = sendcmd(1,0x100,cnt&0xff);
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c = sendcmd(1,0x100,cnt>>8);
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/* now write block */
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dma_wd.dma_mode_status = 0x10a; /* DMA enable */
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if( !acsi_wait_for_IRQ(100) ) /* wait for DMA to complete */
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goto end;
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dma_wd.dma_mode_status = 0x19a; /* DMA disable ! */
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c = dma_wd.fdc_acces_seccount;
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end:
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c = sendcmd(1,0x100,0);
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c = sendcmd(1,0x100,0);
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dma_wd.dma_mode_status = 0x180;
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udelay(40);
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acsi_wait_for_noIRQ(20);
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return( c & 0x02);
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}
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/* Check for a network adaptor of this type, and return '0' if one exists.
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*/
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struct net_device * __init bionet_probe(int unit)
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{
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struct net_device *dev;
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unsigned char station_addr[6];
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static unsigned version_printed;
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static int no_more_found; /* avoid "Probing for..." printed 4 times */
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int i;
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int err;
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if (!MACH_IS_ATARI || no_more_found)
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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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SET_MODULE_OWNER(dev);
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printk("Probing for BioNet 100 Adapter...\n");
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stdma_lock(bionet_intr, NULL);
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i = get_status(station_addr); /* Read the station address PROM. */
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ENABLE_IRQ();
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stdma_release();
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/* Check the first three octets of the S.A. for the manufactor's code.
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*/
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if( i < 0
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|| station_addr[0] != 'B'
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|| station_addr[1] != 'I'
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|| station_addr[2] != 'O' ) {
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no_more_found = 1;
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printk( "No BioNet 100 found.\n" );
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free_netdev(dev);
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return ERR_PTR(-ENODEV);
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}
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if (bionet_debug > 0 && version_printed++ == 0)
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printk(version);
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printk("%s: %s found, eth-addr: %02x-%02x-%02x:%02x-%02x-%02x.\n",
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dev->name, "BioNet 100",
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station_addr[0], station_addr[1], station_addr[2],
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station_addr[3], station_addr[4], station_addr[5]);
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/* Initialize the device structure. */
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nic_packet = (struct nic_pkt_s *)acsi_buffer;
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phys_nic_packet = (unsigned char *)phys_acsi_buffer;
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if (bionet_debug > 0) {
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printk("nic_packet at 0x%p, phys at 0x%p\n",
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nic_packet, phys_nic_packet );
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}
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dev->open = bionet_open;
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dev->stop = bionet_close;
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dev->hard_start_xmit = bionet_send_packet;
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dev->get_stats = net_get_stats;
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/* Fill in the fields of the device structure with ethernet-generic
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* values. This should be in a common file instead of per-driver.
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*/
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for (i = 0; i < ETH_ALEN; i++) {
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#if 0
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dev->broadcast[i] = 0xff;
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#endif
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dev->dev_addr[i] = station_addr[i];
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}
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err = register_netdev(dev);
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if (!err)
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return dev;
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free_netdev(dev);
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return ERR_PTR(err);
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}
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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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bionet_open(struct net_device *dev) {
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struct net_local *lp = netdev_priv(dev);
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if (bionet_debug > 0)
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printk("bionet_open\n");
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stdma_lock(bionet_intr, NULL);
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/* Reset the hardware here.
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*/
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set_status(4);
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lp->open_time = 0; /*jiffies*/
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lp->poll_time = MAX_POLL_TIME;
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dev->tbusy = 0;
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dev->interrupt = 0;
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dev->start = 1;
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stdma_release();
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bionet_timer.data = (long)dev;
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bionet_timer.expires = jiffies + lp->poll_time;
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add_timer(&bionet_timer);
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return 0;
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}
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static int
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bionet_send_packet(struct sk_buff *skb, struct net_device *dev) {
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struct net_local *lp = netdev_priv(dev);
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unsigned long flags;
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/* Block a timer-based transmit from overlapping. This could better be
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* done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
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*/
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local_irq_save(flags);
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if (stdma_islocked()) {
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local_irq_restore(flags);
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lp->stats.tx_errors++;
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}
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else {
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int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
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unsigned long buf = virt_to_phys(skb->data);
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int stat;
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stdma_lock(bionet_intr, NULL);
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local_irq_restore(flags);
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if( !STRAM_ADDR(buf+length-1) ) {
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memcpy(nic_packet->buffer, skb->data, length);
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buf = (unsigned long)&((struct nic_pkt_s *)phys_nic_packet)->buffer;
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}
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if (bionet_debug >1) {
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u_char *data = nic_packet->buffer, *p;
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int i;
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printk( "%s: TX pkt type 0x%4x from ", dev->name,
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((u_short *)data)[6]);
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for( p = &data[6], i = 0; i < 6; i++ )
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printk("%02x%s", *p++,i != 5 ? ":" : "" );
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printk(" to ");
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for( p = data, i = 0; i < 6; i++ )
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printk("%02x%s", *p++,i != 5 ? ":" : "" "\n" );
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printk( "%s: ", dev->name );
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printk(" data %02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x"
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" %02x%02x%02x%02x len %d\n",
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data[12], data[13], data[14], data[15], data[16], data[17], data[18], data[19],
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data[20], data[21], data[22], data[23], data[24], data[25], data[26], data[27],
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data[28], data[29], data[30], data[31], data[32], data[33],
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length );
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}
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dma_cache_maintenance(buf, length, 1);
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stat = hardware_send_packet(buf, length);
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ENABLE_IRQ();
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stdma_release();
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dev->trans_start = jiffies;
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dev->tbusy = 0;
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lp->stats.tx_packets++;
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lp->stats.tx_bytes+=length;
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}
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dev_kfree_skb(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* We have a good packet(s), get it/them out of the buffers.
|
|
*/
|
|
static void
|
|
bionet_poll_rx(struct net_device *dev) {
|
|
struct net_local *lp = netdev_priv(dev);
|
|
int boguscount = 10;
|
|
int pkt_len, status;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
/* ++roman: Take care at locking the ST-DMA... This must be done with ints
|
|
* off, since otherwise an int could slip in between the question and the
|
|
* locking itself, and then we'd go to sleep... And locking itself is
|
|
* necessary to keep the floppy_change timer from working with ST-DMA
|
|
* registers. */
|
|
if (stdma_islocked()) {
|
|
local_irq_restore(flags);
|
|
return;
|
|
}
|
|
stdma_lock(bionet_intr, NULL);
|
|
DISABLE_IRQ();
|
|
local_irq_restore(flags);
|
|
|
|
if( lp->poll_time < MAX_POLL_TIME ) lp->poll_time++;
|
|
|
|
while(boguscount--) {
|
|
status = get_frame((unsigned long)phys_nic_packet, 0);
|
|
|
|
if( status == 0 ) break;
|
|
|
|
/* Good packet... */
|
|
|
|
dma_cache_maintenance((unsigned long)phys_nic_packet, 1520, 0);
|
|
|
|
pkt_len = (nic_packet->l_hi << 8) | nic_packet->l_lo;
|
|
|
|
lp->poll_time = bionet_min_poll_time; /* fast poll */
|
|
if( pkt_len >= 60 && pkt_len <= 1520 ) {
|
|
/* ^^^^ war 1514 KHL */
|
|
/* Malloc up new buffer.
|
|
*/
|
|
struct sk_buff *skb = dev_alloc_skb( pkt_len + 2 );
|
|
if (skb == NULL) {
|
|
printk("%s: Memory squeeze, dropping packet.\n",
|
|
dev->name);
|
|
lp->stats.rx_dropped++;
|
|
break;
|
|
}
|
|
|
|
skb_reserve( skb, 2 ); /* 16 Byte align */
|
|
skb_put( skb, pkt_len ); /* make room */
|
|
|
|
/* 'skb->data' points to the start of sk_buff data area.
|
|
*/
|
|
memcpy(skb->data, nic_packet->buffer, pkt_len);
|
|
skb->protocol = eth_type_trans( skb, dev );
|
|
netif_rx(skb);
|
|
dev->last_rx = jiffies;
|
|
lp->stats.rx_packets++;
|
|
lp->stats.rx_bytes+=pkt_len;
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
if (bionet_debug >1) {
|
|
u_char *data = nic_packet->buffer, *p;
|
|
int i;
|
|
|
|
printk( "%s: RX pkt type 0x%4x from ", dev->name,
|
|
((u_short *)data)[6]);
|
|
|
|
|
|
for( p = &data[6], i = 0; i < 6; i++ )
|
|
printk("%02x%s", *p++,i != 5 ? ":" : "" );
|
|
printk(" to ");
|
|
for( p = data, i = 0; i < 6; i++ )
|
|
printk("%02x%s", *p++,i != 5 ? ":" : "" "\n" );
|
|
|
|
printk( "%s: ", dev->name );
|
|
printk(" data %02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x"
|
|
" %02x%02x%02x%02x len %d\n",
|
|
data[12], data[13], data[14], data[15], data[16], data[17], data[18], data[19],
|
|
data[20], data[21], data[22], data[23], data[24], data[25], data[26], data[27],
|
|
data[28], data[29], data[30], data[31], data[32], data[33],
|
|
pkt_len );
|
|
}
|
|
}
|
|
else {
|
|
printk(" Packet has wrong length: %04d bytes\n", pkt_len);
|
|
lp->stats.rx_errors++;
|
|
}
|
|
}
|
|
stdma_release();
|
|
ENABLE_IRQ();
|
|
return;
|
|
}
|
|
|
|
/* bionet_tick: called by bionet_timer. Reads packets from the adapter,
|
|
* passes them to the higher layers and restarts the timer.
|
|
*/
|
|
static void
|
|
bionet_tick(unsigned long data) {
|
|
struct net_device *dev = (struct net_device *)data;
|
|
struct net_local *lp = netdev_priv(dev);
|
|
|
|
if( bionet_debug > 0 && (lp->open_time++ & 7) == 8 )
|
|
printk("bionet_tick: %ld\n", lp->open_time);
|
|
|
|
if( !stdma_islocked() ) bionet_poll_rx(dev);
|
|
|
|
bionet_timer.expires = jiffies + lp->poll_time;
|
|
add_timer(&bionet_timer);
|
|
}
|
|
|
|
/* The inverse routine to bionet_open().
|
|
*/
|
|
static int
|
|
bionet_close(struct net_device *dev) {
|
|
struct net_local *lp = netdev_priv(dev);
|
|
|
|
if (bionet_debug > 0)
|
|
printk("bionet_close, open_time=%ld\n", lp->open_time);
|
|
del_timer(&bionet_timer);
|
|
stdma_lock(bionet_intr, NULL);
|
|
|
|
set_status(0);
|
|
lp->open_time = 0;
|
|
|
|
dev->tbusy = 1;
|
|
dev->start = 0;
|
|
|
|
stdma_release();
|
|
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);
|
|
return &lp->stats;
|
|
}
|
|
|
|
|
|
#ifdef MODULE
|
|
|
|
static struct net_device *bio_dev;
|
|
|
|
int init_module(void)
|
|
{
|
|
bio_dev = bionet_probe(-1);
|
|
if (IS_ERR(bio_dev))
|
|
return PTR_ERR(bio_dev);
|
|
return 0;
|
|
}
|
|
|
|
void cleanup_module(void)
|
|
{
|
|
unregister_netdev(bio_dev);
|
|
free_netdev(bio_dev);
|
|
}
|
|
|
|
#endif /* MODULE */
|
|
|
|
/* Local variables:
|
|
* compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/include
|
|
-b m68k-linuxaout -Wall -Wstrict-prototypes -O2
|
|
-fomit-frame-pointer -pipe -DMODULE -I../../net/inet -c bionet.c"
|
|
* version-control: t
|
|
* kept-new-versions: 5
|
|
* tab-width: 8
|
|
* End:
|
|
*/
|