1 files changed, 674 insertions, 0 deletions

diff --git a/drivers/net/atari_bionet.c b/drivers/net/atari_bionet.c
new file mode 100644
index 000000000000..1798ce7262c9
--- /dev/null
+++ b/drivers/net/atari_bionet.c
@@ -0,0 +1,674 @@
+/* bionet.c     BioNet-100 device driver for linux68k.
+ *
+ * Version:     @(#)bionet.c    1.0     02/06/96
+ *
+ * Author:      Hartmut Laue <laue@ifk-mp.uni-kiel.de>
+ * and          Torsten Narjes <narjes@ifk-mp.uni-kiel.de>
+ *
+ * Little adaptions for integration into pl7 by Roman Hodek
+ *
+ * Some changes in bionet_poll_rx by Karl-Heinz Lohner
+ *
+        What is it ?
+        ------------
+        This driver controls the BIONET-100 LAN-Adapter which connects
+        an ATARI ST/TT via the ACSI-port to an Ethernet-based network.
+
+        This version can be compiled as a loadable module (See the
+        compile command at the bottom of this file).
+        At load time, you can optionally set the debugging level and the
+        fastest response time on the command line of 'insmod'.
+
+        'bionet_debug'
+                controls the amount of diagnostic messages:
+          0  : no messages
+          >0 : see code for meaning of printed messages
+
+        'bionet_min_poll_time' (always >=1)
+                gives the time (in jiffies) between polls. Low values
+                increase the system load (beware!)
+
+        When loaded, a net device with the name 'bio0' becomes available,
+        which can be controlled with the usual 'ifconfig' command.
+
+        It is possible to compile this driver into the kernel like other
+        (net) drivers. For this purpose, some source files (e.g. config-files
+        makefiles, Space.c) must be changed accordingly. (You may refer to
+        other drivers how to do it.) In this case, the device will be detected
+        at boot time and (probably) appear as 'eth0'.
+
+        This code is based on several sources:
+        - The driver code for a parallel port ethernet adapter by
+          Donald Becker (see file 'atp.c' from the PC linux distribution)
+        - The ACSI code by Roman Hodek for the ATARI-ACSI harddisk support
+          and DMA handling.
+        - Very limited information about moving packets in and out of the
+          BIONET-adapter from the TCP package for TOS by BioData GmbH.
+
+        Theory of Operation
+        -------------------
+        Because the ATARI DMA port is usually shared between several
+        devices (eg. harddisk, floppy) we cannot block the ACSI bus
+        while waiting for interrupts. Therefore we use a polling mechanism
+        to fetch packets from the adapter. For the same reason, we send
+        packets without checking that the previous packet has been sent to
+        the LAN. We rely on the higher levels of the networking code to detect
+        missing packets and resend them.
+
+        Before we access the ATARI DMA controller, we check if another
+        process is using the DMA. If not, we lock the DMA, perform one or
+        more packet transfers and unlock the DMA before returning.
+        We do not use 'stdma_lock' unconditionally because it is unclear
+        if the networking code can be set to sleep, which will happen if
+        another (possibly slow) device is using the DMA controller.
+
+        The polling is done via timer interrupts which periodically
+        'simulate' an interrupt from the Ethernet adapter. The time (in jiffies)
+        between polls varies depending on an estimate of the net activity.
+        The allowed range is given by the variable 'bionet_min_poll_time'
+        for the lower (fastest) limit and the constant 'MAX_POLL_TIME'
+        for the higher (slowest) limit.
+
+        Whenever a packet arrives, we switch to fastest response by setting
+        the polling time to its lowest limit. If the following poll fails,
+        because no packets have arrived, we increase the time for the next
+        poll. When the net activity is low, the polling time effectively
+        stays at its maximum value, resulting in the lowest load for the
+        machine.
+ */
+
+#define MAX_POLL_TIME   10
+
+static char version[] =
+        "bionet.c:v1.0 06-feb-96 (c) Hartmut Laue.\n";
+
+#include <linux/module.h>
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/atarihw.h>
+#include <asm/atariints.h>
+#include <asm/atari_acsi.h>
+#include <asm/atari_stdma.h>
+
+
+/* use 0 for production, 1 for verification, >2 for debug
+ */
+#ifndef NET_DEBUG
+#define NET_DEBUG 0
+#endif
+/*
+ * Global variable 'bionet_debug'. Can be set at load time by 'insmod'
+ */
+unsigned int bionet_debug = NET_DEBUG;
+MODULE_PARM(bionet_debug, "i");
+MODULE_PARM_DESC(bionet_debug, "bionet debug level (0-2)");
+MODULE_LICENSE("GPL");
+
+static unsigned int bionet_min_poll_time = 2;
+
+
+/* Information that need to be kept for each board.
+ */
+struct net_local {
+        struct net_device_stats stats;
+        long open_time;                 /* for debugging */
+        int  poll_time;                 /* polling time varies with net load */
+};
+
+static struct nic_pkt_s {               /* packet format */
+        unsigned char   status;
+        unsigned char   dummy;
+        unsigned char   l_lo, l_hi;
+        unsigned char   buffer[3000];
+} *nic_packet;
+unsigned char *phys_nic_packet;
+
+/* Index to functions, as function prototypes.
+ */
+static int bionet_open(struct net_device *dev);
+static int bionet_send_packet(struct sk_buff *skb, struct net_device *dev);
+static void bionet_poll_rx(struct net_device *);
+static int bionet_close(struct net_device *dev);
+static struct net_device_stats *net_get_stats(struct net_device *dev);
+static void bionet_tick(unsigned long);
+
+static struct timer_list bionet_timer = TIMER_INITIALIZER(bionet_tick, 0, 0);
+
+#define STRAM_ADDR(a)   (((a) & 0xff000000) == 0)
+
+/* The following routines access the ethernet board connected to the
+ * ACSI port via the st_dma chip.
+ */
+#define NODE_ADR 0x60
+
+#define C_READ 8
+#define C_WRITE 0x0a
+#define C_GETEA 0x0f
+#define C_SETCR 0x0e
+
+static int
+sendcmd(unsigned int a0, unsigned int mod, unsigned int cmd) {
+        unsigned int c;
+
+        dma_wd.dma_mode_status = (mod | ((a0) ? 2 : 0) | 0x88);
+        dma_wd.fdc_acces_seccount = cmd;
+        dma_wd.dma_mode_status = (mod | 0x8a);
+
+        if( !acsi_wait_for_IRQ(HZ/2) )  /* wait for cmd ack */
+                return -1;              /* timeout */
+
+        c = dma_wd.fdc_acces_seccount;
+        return (c & 0xff);
+}
+
+
+static void
+set_status(int cr) {
+        sendcmd(0,0x100,NODE_ADR | C_SETCR);    /* CMD: SET CR */
+        sendcmd(1,0x100,cr);
+
+        dma_wd.dma_mode_status = 0x80;
+}
+
+static int
+get_status(unsigned char *adr) {
+        int i,c;
+
+        DISABLE_IRQ();
+        c = sendcmd(0,0x00,NODE_ADR | C_GETEA);  /* CMD: GET ETH ADR*/
+        if( c < 0 ) goto gsend;
+
+        /* now read status bytes */
+
+        for (i=0; i<6; i++) {
+                dma_wd.fdc_acces_seccount = 0;  /* request next byte */
+
+                if( !acsi_wait_for_IRQ(HZ/2) ) {        /* wait for cmd ack */
+                        c = -1;
+                        goto gsend;             /* timeout */
+                }
+                c = dma_wd.fdc_acces_seccount;
+                *adr++ = (unsigned char)c;
+        }
+        c = 1;
+gsend:
+        dma_wd.dma_mode_status = 0x80;
+        return c;
+}
+
+static irqreturn_t
+bionet_intr(int irq, void *data, struct pt_regs *fp) {
+        return IRQ_HANDLED;
+}
+
+
+static int
+get_frame(unsigned long paddr, int odd) {
+        int c;
+        unsigned long flags;
+
+        DISABLE_IRQ();
+        local_irq_save(flags);
+
+        dma_wd.dma_mode_status          = 0x9a;
+        dma_wd.dma_mode_status          = 0x19a;
+        dma_wd.dma_mode_status          = 0x9a;
+        dma_wd.fdc_acces_seccount       = 0x04;         /* sector count (was 5) */
+        dma_wd.dma_lo                   = (unsigned char)paddr;
+        paddr >>= 8;
+        dma_wd.dma_md                   = (unsigned char)paddr;
+        paddr >>= 8;
+        dma_wd.dma_hi                   = (unsigned char)paddr;
+        local_irq_restore(flags);
+
+        c = sendcmd(0,0x00,NODE_ADR | C_READ);  /* CMD: READ */
+        if( c < 128 ) goto rend;
+
+        /* now read block */
+
+        c = sendcmd(1,0x00,odd);        /* odd flag for address shift */
+        dma_wd.dma_mode_status  = 0x0a;
+
+        if( !acsi_wait_for_IRQ(100) ) { /* wait for DMA to complete */
+                c = -1;
+                goto rend;
+        }
+        dma_wd.dma_mode_status  = 0x8a;
+        dma_wd.dma_mode_status  = 0x18a;
+        dma_wd.dma_mode_status  = 0x8a;
+        c = dma_wd.fdc_acces_seccount;
+
+        dma_wd.dma_mode_status  = 0x88;
+        c = dma_wd.fdc_acces_seccount;
+        c = 1;
+
+rend:
+        dma_wd.dma_mode_status  = 0x80;
+        udelay(40);
+        acsi_wait_for_noIRQ(20);
+        return c;
+}
+
+
+static int
+hardware_send_packet(unsigned long paddr, int cnt) {
+        unsigned int c;
+        unsigned long flags;
+
+        DISABLE_IRQ();
+        local_irq_save(flags);
+
+        dma_wd.dma_mode_status  = 0x19a;
+        dma_wd.dma_mode_status  = 0x9a;
+        dma_wd.dma_mode_status  = 0x19a;
+        dma_wd.dma_lo           = (unsigned char)paddr;
+        paddr >>= 8;
+        dma_wd.dma_md           = (unsigned char)paddr;
+        paddr >>= 8;
+        dma_wd.dma_hi           = (unsigned char)paddr;
+
+        dma_wd.fdc_acces_seccount       = 0x4;          /* sector count */
+        local_irq_restore(flags);
+
+        c = sendcmd(0,0x100,NODE_ADR | C_WRITE);        /* CMD: WRITE */
+        c = sendcmd(1,0x100,cnt&0xff);
+        c = sendcmd(1,0x100,cnt>>8);
+
+        /* now write block */
+
+        dma_wd.dma_mode_status  = 0x10a;        /* DMA enable */
+        if( !acsi_wait_for_IRQ(100) )           /* wait for DMA to complete */
+                goto end;
+
+        dma_wd.dma_mode_status  = 0x19a;        /* DMA disable ! */
+        c = dma_wd.fdc_acces_seccount;
+
+end:
+        c = sendcmd(1,0x100,0);
+        c = sendcmd(1,0x100,0);
+
+        dma_wd.dma_mode_status  = 0x180;
+        udelay(40);
+        acsi_wait_for_noIRQ(20);
+        return( c & 0x02);
+}
+
+
+/* Check for a network adaptor of this type, and return '0' if one exists.
+ */
+struct net_device * __init bionet_probe(int unit)
+{
+        struct net_device *dev;
+        unsigned char station_addr[6];
+        static unsigned version_printed;
+        static int no_more_found;       /* avoid "Probing for..." printed 4 times */
+        int i;
+        int err;
+
+        if (!MACH_IS_ATARI || no_more_found)
+                return ERR_PTR(-ENODEV);
+
+        dev = alloc_etherdev(sizeof(struct net_local));
+        if (!dev)
+                return ERR_PTR(-ENOMEM);
+        if (unit >= 0) {
+                sprintf(dev->name, "eth%d", unit);
+                netdev_boot_setup_check(dev);
+        }
+        SET_MODULE_OWNER(dev);
+
+        printk("Probing for BioNet 100 Adapter...\n");
+
+        stdma_lock(bionet_intr, NULL);
+        i = get_status(station_addr);   /* Read the station address PROM.  */
+        ENABLE_IRQ();
+        stdma_release();
+
+        /* Check the first three octets of the S.A. for the manufactor's code.
+         */
+
+        if( i < 0
+        ||  station_addr[0] != 'B'
+        ||  station_addr[1] != 'I'
+        ||  station_addr[2] != 'O' ) {
+                no_more_found = 1;
+                printk( "No BioNet 100 found.\n" );
+                free_netdev(dev);
+                return ERR_PTR(-ENODEV);
+        }
+
+        if (bionet_debug > 0 && version_printed++ == 0)
+                printk(version);
+
+        printk("%s: %s found, eth-addr: %02x-%02x-%02x:%02x-%02x-%02x.\n",
+                dev->name, "BioNet 100",
+                station_addr[0], station_addr[1], station_addr[2],
+                station_addr[3], station_addr[4], station_addr[5]);
+
+        /* Initialize the device structure. */
+
+        nic_packet = (struct nic_pkt_s *)acsi_buffer;
+        phys_nic_packet = (unsigned char *)phys_acsi_buffer;
+        if (bionet_debug > 0) {
+                printk("nic_packet at 0x%p, phys at 0x%p\n",
+                        nic_packet, phys_nic_packet );
+        }
+
+        dev->open               = bionet_open;
+        dev->stop               = bionet_close;
+        dev->hard_start_xmit    = bionet_send_packet;
+        dev->get_stats          = net_get_stats;
+
+        /* Fill in the fields of the device structure with ethernet-generic
+         * values. This should be in a common file instead of per-driver.
+         */
+
+        for (i = 0; i < ETH_ALEN; i++) {
+#if 0
+                dev->broadcast[i] = 0xff;
+#endif
+                dev->dev_addr[i]  = station_addr[i];
+        }
+        err = register_netdev(dev);
+        if (!err)
+                return dev;
+        free_netdev(dev);
+        return ERR_PTR(err);
+}
+
+/* Open/initialize the board.  This is called (in the current kernel)
+   sometime after booting when the 'ifconfig' program is run.
+
+   This routine should set everything up anew at each open, even
+   registers that "should" only need to be set once at boot, so that
+   there is non-reboot way to recover if something goes wrong.
+ */
+static int
+bionet_open(struct net_device *dev) {
+        struct net_local *lp = netdev_priv(dev);
+
+        if (bionet_debug > 0)
+                printk("bionet_open\n");
+        stdma_lock(bionet_intr, NULL);
+
+        /* Reset the hardware here.
+         */
+        set_status(4);
+        lp->open_time = 0;      /*jiffies*/
+        lp->poll_time = MAX_POLL_TIME;
+
+        dev->tbusy = 0;
+        dev->interrupt = 0;
+        dev->start = 1;
+
+        stdma_release();
+        bionet_timer.data = (long)dev;
+        bionet_timer.expires = jiffies + lp->poll_time;
+        add_timer(&bionet_timer);
+        return 0;
+}
+
+static int
+bionet_send_packet(struct sk_buff *skb, struct net_device *dev) {
+        struct net_local *lp = netdev_priv(dev);
+        unsigned long flags;
+
+        /* Block a timer-based transmit from overlapping.  This could better be
+         * done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
+         */
+        local_irq_save(flags);
+
+        if (stdma_islocked()) {
+                local_irq_restore(flags);
+                lp->stats.tx_errors++;
+        }
+        else {
+                int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+                unsigned long buf = virt_to_phys(skb->data);
+                int stat;
+
+                stdma_lock(bionet_intr, NULL);
+                local_irq_restore(flags);
+                if( !STRAM_ADDR(buf+length-1) ) {
+                        memcpy(nic_packet->buffer, skb->data, length);
+                        buf = (unsigned long)&((struct nic_pkt_s *)phys_nic_packet)->buffer;
+                }
+
+                if (bionet_debug >1) {
+                        u_char *data = nic_packet->buffer, *p;
+                        int i;
+                        
+                        printk( "%s: TX 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],
+                                  length );
+                }
+                dma_cache_maintenance(buf, length, 1);
+
+                stat = hardware_send_packet(buf, length);
+                ENABLE_IRQ();
+                stdma_release();
+
+                dev->trans_start = jiffies;
+                dev->tbusy       = 0;
+                lp->stats.tx_packets++;
+                lp->stats.tx_bytes+=length;
+        }
+        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->dev = dev;
+                        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:
+ */