diff options
Diffstat (limited to 'drivers/net/atari_bionet.c')
| -rw-r--r-- | drivers/net/atari_bionet.c | 674 |
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 00000000000..1798ce7262c --- /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: + */ |