mac89x0.c
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上传日期:2013-04-10
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- /* mac89x0.c: A Crystal Semiconductor CS89[02]0 driver for linux. */
- /*
- Written 1996 by Russell Nelson, with reference to skeleton.c
- written 1993-1994 by Donald Becker.
- This software may be used and distributed according to the terms
- of the GNU General Public License, incorporated herein by reference.
- The author may be reached at nelson@crynwr.com, Crynwr
- Software, 11 Grant St., Potsdam, NY 13676
- Changelog:
- Mike Cruse : mcruse@cti-ltd.com
- : Changes for Linux 2.0 compatibility.
- : Added dev_id parameter in net_interrupt(),
- : request_irq() and free_irq(). Just NULL for now.
- Mike Cruse : Added MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT macros
- : in net_open() and net_close() so kerneld would know
- : that the module is in use and wouldn't eject the
- : driver prematurely.
- Mike Cruse : Rewrote init_module() and cleanup_module using 8390.c
- : as an example. Disabled autoprobing in init_module(),
- : not a good thing to do to other devices while Linux
- : is running from all accounts.
-
- Alan Cox : Removed 1.2 support, added 2.1 extra counters.
- David Huggins-Daines <dhd@debian.org>
-
- Split this off into mac89x0.c, and gutted it of all parts which are
- not relevant to the existing CS8900 cards on the Macintosh
- (i.e. basically the Daynaport CS and LC cards). To be precise:
- * Removed all the media-detection stuff, because these cards are
- TP-only.
- * Lobotomized the ISA interrupt bogosity, because these cards use
- a hardwired NuBus interrupt and a magic ISAIRQ value in the card.
- * Basically eliminated everything not relevant to getting the
- cards minimally functioning on the Macintosh.
- I might add that these cards are badly designed even from the Mac
- standpoint, in that Dayna, in their infinite wisdom, used NuBus slot
- I/O space and NuBus interrupts for these cards, but neglected to
- provide anything even remotely resembling a NuBus ROM. Therefore we
- have to probe for them in a brain-damaged ISA-like fashion.
- Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
- check kmalloc and release the allocated memory on failure in
- mac89x0_probe and in init_module
- use save_flags/restore_flags in net_get_stat, not just cli/sti
- */
- static char *version =
- "cs89x0.c:v1.02 11/26/96 Russell Nelson <nelson@crynwr.com>n";
- /* ======================= configure the driver here ======================= */
- /* use 0 for production, 1 for verification, >2 for debug */
- #ifndef NET_DEBUG
- #define NET_DEBUG 0
- #endif
- /* ======================= end of configuration ======================= */
- /* Always include 'config.h' first in case the user wants to turn on
- or override something. */
- #include <linux/module.h>
- #define PRINTK(x) printk x
- /*
- Sources:
- Crynwr packet driver epktisa.
- Crystal Semiconductor data sheets.
- */
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/fcntl.h>
- #include <linux/interrupt.h>
- #include <linux/ptrace.h>
- #include <linux/ioport.h>
- #include <linux/in.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/nubus.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <asm/io.h>
- #include <asm/hwtest.h>
- #include <asm/macints.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include "cs89x0.h"
- static unsigned int net_debug = NET_DEBUG;
- /* Information that need to be kept for each board. */
- struct net_local {
- struct net_device_stats stats;
- int chip_type; /* one of: CS8900, CS8920, CS8920M */
- char chip_revision; /* revision letter of the chip ('A'...) */
- int send_cmd; /* the propercommand used to send a packet. */
- int rx_mode;
- int curr_rx_cfg;
- int send_underrun; /* keep track of how many underruns in a row we get */
- struct sk_buff *skb;
- };
- /* Index to functions, as function prototypes. */
- extern int mac89x0_probe(struct net_device *dev);
- #if 0
- extern void reset_chip(struct net_device *dev);
- #endif
- static int net_open(struct net_device *dev);
- static int net_send_packet(struct sk_buff *skb, struct net_device *dev);
- static void net_interrupt(int irq, void *dev_id, struct pt_regs *regs);
- static void set_multicast_list(struct net_device *dev);
- static void net_rx(struct net_device *dev);
- static int net_close(struct net_device *dev);
- static struct net_device_stats *net_get_stats(struct net_device *dev);
- static int set_mac_address(struct net_device *dev, void *addr);
- /* Example routines you must write ;->. */
- #define tx_done(dev) 1
- /* For reading/writing registers ISA-style */
- static int inline
- readreg_io(struct net_device *dev, int portno)
- {
- nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
- return swab16(nubus_readw(dev->base_addr + DATA_PORT));
- }
- static void inline
- writereg_io(struct net_device *dev, int portno, int value)
- {
- nubus_writew(swab16(portno), dev->base_addr + ADD_PORT);
- nubus_writew(swab16(value), dev->base_addr + DATA_PORT);
- }
- /* These are for reading/writing registers in shared memory */
- static int inline
- readreg(struct net_device *dev, int portno)
- {
- return swab16(nubus_readw(dev->mem_start + portno));
- }
- static void inline
- writereg(struct net_device *dev, int portno, int value)
- {
- nubus_writew(swab16(value), dev->mem_start + portno);
- }
- /* Probe for the CS8900 card in slot E. We won't bother looking
- anywhere else until we have a really good reason to do so. */
- int __init mac89x0_probe(struct net_device *dev)
- {
- static int once_is_enough;
- struct net_local *lp;
- static unsigned version_printed;
- int i, slot;
- unsigned rev_type = 0;
- unsigned long ioaddr;
- unsigned short sig;
- SET_MODULE_OWNER(dev);
- if (once_is_enough)
- return -ENODEV;
- once_is_enough = 1;
- /* We might have to parameterize this later */
- slot = 0xE;
- /* Get out now if there's a real NuBus card in slot E */
- if (nubus_find_slot(slot, NULL) != NULL)
- return -ENODEV;
- /* The pseudo-ISA bits always live at offset 0x300 (gee,
- wonder why...) */
- ioaddr = (unsigned long)
- nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE);
- {
- unsigned long flags;
- int card_present;
-
- save_flags(flags);
- cli();
- card_present = hwreg_present((void*) ioaddr+4)
- && hwreg_present((void*) ioaddr + DATA_PORT);
- restore_flags(flags);
- if (!card_present)
- return -ENODEV;
- }
- nubus_writew(0, ioaddr + ADD_PORT);
- sig = nubus_readw(ioaddr + DATA_PORT);
- if (sig != swab16(CHIP_EISA_ID_SIG))
- return -ENODEV;
- /* Initialize the net_device structure. */
- if (dev->priv == NULL) {
- dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
- if (!dev->priv)
- return -ENOMEM;
- memset(dev->priv, 0, sizeof(struct net_local));
- }
- lp = (struct net_local *)dev->priv;
- /* Fill in the 'dev' fields. */
- dev->base_addr = ioaddr;
- dev->mem_start = (unsigned long)
- nubus_slot_addr(slot) | (((slot&0xf) << 20) + MMIOBASE);
- dev->mem_end = dev->mem_start + 0x1000;
- /* Turn on shared memory */
- writereg_io(dev, PP_BusCTL, MEMORY_ON);
- /* get the chip type */
- rev_type = readreg(dev, PRODUCT_ID_ADD);
- lp->chip_type = rev_type &~ REVISON_BITS;
- lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';
- /* Check the chip type and revision in order to set the correct send command
- CS8920 revision C and CS8900 revision F can use the faster send. */
- lp->send_cmd = TX_AFTER_381;
- if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
- lp->send_cmd = TX_NOW;
- if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
- lp->send_cmd = TX_NOW;
- if (net_debug && version_printed++ == 0)
- printk(version);
- printk(KERN_INFO "%s: cs89%c0%s rev %c found at %#8lx",
- dev->name,
- lp->chip_type==CS8900?'0':'2',
- lp->chip_type==CS8920M?"M":"",
- lp->chip_revision,
- dev->base_addr);
- /* Try to read the MAC address */
- if ((readreg(dev, PP_SelfST) & (EEPROM_PRESENT | EEPROM_OK)) == 0) {
- printk("nmac89x0: No EEPROM, giving up now.n");
- kfree(dev->priv);
- dev->priv = NULL;
- return -ENODEV;
- } else {
- for (i = 0; i < ETH_ALEN; i += 2) {
- /* Big-endian (why??!) */
- unsigned short s = readreg(dev, PP_IA + i);
- dev->dev_addr[i] = s >> 8;
- dev->dev_addr[i+1] = s & 0xff;
- }
- }
- dev->irq = SLOT2IRQ(slot);
- printk(" IRQ %d ADDR ", dev->irq);
- /* print the ethernet address. */
- for (i = 0; i < ETH_ALEN; i++)
- printk("%2.2x%s", dev->dev_addr[i],
- ((i < ETH_ALEN-1) ? ":" : ""));
- dev->open = net_open;
- dev->stop = net_close;
- dev->hard_start_xmit = net_send_packet;
- dev->get_stats = net_get_stats;
- dev->set_multicast_list = &set_multicast_list;
- dev->set_mac_address = &set_mac_address;
- /* Fill in the fields of the net_device structure with ethernet values. */
- ether_setup(dev);
- printk("n");
- return 0;
- }
- #if 0
- /* This is useful for something, but I don't know what yet. */
- void __init reset_chip(struct net_device *dev)
- {
- int reset_start_time;
- writereg(dev, PP_SelfCTL, readreg(dev, PP_SelfCTL) | POWER_ON_RESET);
- /* wait 30 ms */
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(30*HZ/1000);
- /* Wait until the chip is reset */
- reset_start_time = jiffies;
- while( (readreg(dev, PP_SelfST) & INIT_DONE) == 0 && jiffies - reset_start_time < 2)
- ;
- }
- #endif
- /* 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
- net_open(struct net_device *dev)
- {
- struct net_local *lp = (struct net_local *)dev->priv;
- int i;
- /* Disable the interrupt for now */
- writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) & ~ENABLE_IRQ);
- /* Grab the interrupt */
- if (request_irq(dev->irq, &net_interrupt, 0, "cs89x0", dev))
- return -EAGAIN;
- /* Set up the IRQ - Apparently magic */
- if (lp->chip_type == CS8900)
- writereg(dev, PP_CS8900_ISAINT, 0);
- else
- writereg(dev, PP_CS8920_ISAINT, 0);
- /* set the Ethernet address */
- for (i=0; i < ETH_ALEN/2; i++)
- writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));
- /* Turn on both receive and transmit operations */
- writereg(dev, PP_LineCTL, readreg(dev, PP_LineCTL) | SERIAL_RX_ON | SERIAL_TX_ON);
- /* Receive only error free packets addressed to this card */
- lp->rx_mode = 0;
- writereg(dev, PP_RxCTL, DEF_RX_ACCEPT);
- lp->curr_rx_cfg = RX_OK_ENBL | RX_CRC_ERROR_ENBL;
- writereg(dev, PP_RxCFG, lp->curr_rx_cfg);
- writereg(dev, PP_TxCFG, TX_LOST_CRS_ENBL | TX_SQE_ERROR_ENBL | TX_OK_ENBL |
- TX_LATE_COL_ENBL | TX_JBR_ENBL | TX_ANY_COL_ENBL | TX_16_COL_ENBL);
- writereg(dev, PP_BufCFG, READY_FOR_TX_ENBL | RX_MISS_COUNT_OVRFLOW_ENBL |
- TX_COL_COUNT_OVRFLOW_ENBL | TX_UNDERRUN_ENBL);
- /* now that we've got our act together, enable everything */
- writereg(dev, PP_BusCTL, readreg(dev, PP_BusCTL) | ENABLE_IRQ);
- netif_start_queue(dev);
- return 0;
- }
- static int
- net_send_packet(struct sk_buff *skb, struct net_device *dev)
- {
- if (dev->tbusy) {
- /* If we get here, some higher level has decided we are broken.
- There should really be a "kick me" function call instead. */
- int tickssofar = jiffies - dev->trans_start;
- if (tickssofar < 5)
- return 1;
- if (net_debug > 0) printk("%s: transmit timed out, %s?n", dev->name,
- tx_done(dev) ? "IRQ conflict" : "network cable problem");
- /* Try to restart the adaptor. */
- dev->tbusy=0;
- dev->trans_start = jiffies;
- }
- /* Block a timer-based transmit from overlapping. This could better be
- done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
- if (test_and_set_bit(0, (void*)&dev->tbusy) != 0)
- printk("%s: Transmitter access conflict.n", dev->name);
- else {
- struct net_local *lp = (struct net_local *)dev->priv;
- unsigned long flags;
- if (net_debug > 3)
- printk("%s: sent %d byte packet of type %xn",
- dev->name, skb->len,
- (skb->data[ETH_ALEN+ETH_ALEN] << 8)
- | skb->data[ETH_ALEN+ETH_ALEN+1]);
- /* keep the upload from being interrupted, since we
- ask the chip to start transmitting before the
- whole packet has been completely uploaded. */
- save_flags(flags);
- cli();
- /* initiate a transmit sequence */
- writereg(dev, PP_TxCMD, lp->send_cmd);
- writereg(dev, PP_TxLength, skb->len);
- /* Test to see if the chip has allocated memory for the packet */
- if ((readreg(dev, PP_BusST) & READY_FOR_TX_NOW) == 0) {
- /* Gasp! It hasn't. But that shouldn't happen since
- we're waiting for TxOk, so return 1 and requeue this packet. */
- restore_flags(flags);
- return 1;
- }
- /* Write the contents of the packet */
- memcpy_toio(dev->mem_start + PP_TxFrame, skb->data, skb->len+1);
- restore_flags(flags);
- dev->trans_start = jiffies;
- }
- dev_kfree_skb (skb);
- return 0;
- }
- /* The typical workload of the driver:
- Handle the network interface interrupts. */
- static void net_interrupt(int irq, void *dev_id, struct pt_regs * regs)
- {
- struct net_device *dev = dev_id;
- struct net_local *lp;
- int ioaddr, status;
- if (dev == NULL) {
- printk ("net_interrupt(): irq %d for unknown device.n", irq);
- return;
- }
- if (dev->interrupt)
- printk("%s: Re-entering the interrupt handler.n", dev->name);
- dev->interrupt = 1;
- ioaddr = dev->base_addr;
- lp = (struct net_local *)dev->priv;
- /* we MUST read all the events out of the ISQ, otherwise we'll never
- get interrupted again. As a consequence, we can't have any limit
- on the number of times we loop in the interrupt handler. The
- hardware guarantees that eventually we'll run out of events. Of
- course, if you're on a slow machine, and packets are arriving
- faster than you can read them off, you're screwed. Hasta la
- vista, baby! */
- while ((status = swab16(nubus_readw(dev->base_addr + ISQ_PORT)))) {
- if (net_debug > 4)printk("%s: event=%04xn", dev->name, status);
- switch(status & ISQ_EVENT_MASK) {
- case ISQ_RECEIVER_EVENT:
- /* Got a packet(s). */
- net_rx(dev);
- break;
- case ISQ_TRANSMITTER_EVENT:
- lp->stats.tx_packets++;
- dev->tbusy = 0;
- mark_bh(NET_BH); /* Inform upper layers. */
- if ((status & TX_OK) == 0) lp->stats.tx_errors++;
- if (status & TX_LOST_CRS) lp->stats.tx_carrier_errors++;
- if (status & TX_SQE_ERROR) lp->stats.tx_heartbeat_errors++;
- if (status & TX_LATE_COL) lp->stats.tx_window_errors++;
- if (status & TX_16_COL) lp->stats.tx_aborted_errors++;
- break;
- case ISQ_BUFFER_EVENT:
- if (status & READY_FOR_TX) {
- /* we tried to transmit a packet earlier,
- but inexplicably ran out of buffers.
- That shouldn't happen since we only ever
- load one packet. Shrug. Do the right
- thing anyway. */
- dev->tbusy = 0;
- mark_bh(NET_BH); /* Inform upper layers. */
- }
- if (status & TX_UNDERRUN) {
- if (net_debug > 0) printk("%s: transmit underrunn", dev->name);
- lp->send_underrun++;
- if (lp->send_underrun == 3) lp->send_cmd = TX_AFTER_381;
- else if (lp->send_underrun == 6) lp->send_cmd = TX_AFTER_ALL;
- }
- break;
- case ISQ_RX_MISS_EVENT:
- lp->stats.rx_missed_errors += (status >>6);
- break;
- case ISQ_TX_COL_EVENT:
- lp->stats.collisions += (status >>6);
- break;
- }
- }
- dev->interrupt = 0;
- return;
- }
- /* We have a good packet(s), get it/them out of the buffers. */
- static void
- net_rx(struct net_device *dev)
- {
- struct net_local *lp = (struct net_local *)dev->priv;
- struct sk_buff *skb;
- int status, length;
- status = readreg(dev, PP_RxStatus);
- if ((status & RX_OK) == 0) {
- lp->stats.rx_errors++;
- if (status & RX_RUNT) lp->stats.rx_length_errors++;
- if (status & RX_EXTRA_DATA) lp->stats.rx_length_errors++;
- if (status & RX_CRC_ERROR) if (!(status & (RX_EXTRA_DATA|RX_RUNT)))
- /* per str 172 */
- lp->stats.rx_crc_errors++;
- if (status & RX_DRIBBLE) lp->stats.rx_frame_errors++;
- return;
- }
- length = readreg(dev, PP_RxLength);
- /* Malloc up new buffer. */
- skb = alloc_skb(length, GFP_ATOMIC);
- if (skb == NULL) {
- printk("%s: Memory squeeze, dropping packet.n", dev->name);
- lp->stats.rx_dropped++;
- return;
- }
- skb_put(skb, length);
- skb->dev = dev;
- memcpy_fromio(skb->data, dev->mem_start + PP_RxFrame, length);
- if (net_debug > 3)printk("%s: received %d byte packet of type %xn",
- dev->name, length,
- (skb->data[ETH_ALEN+ETH_ALEN] << 8)
- | skb->data[ETH_ALEN+ETH_ALEN+1]);
- skb->protocol=eth_type_trans(skb,dev);
- netif_rx(skb);
- dev->last_rx = jiffies;
- lp->stats.rx_packets++;
- lp->stats.rx_bytes += length;
- }
- /* The inverse routine to net_open(). */
- static int
- net_close(struct net_device *dev)
- {
- writereg(dev, PP_RxCFG, 0);
- writereg(dev, PP_TxCFG, 0);
- writereg(dev, PP_BufCFG, 0);
- writereg(dev, PP_BusCTL, 0);
- netif_stop_queue(dev);
- free_irq(dev->irq, dev);
- /* Update the statistics here. */
- return 0;
- }
- /* Get the current statistics. This may be called with the card open or
- closed. */
- static struct net_device_stats *
- net_get_stats(struct net_device *dev)
- {
- struct net_local *lp = (struct net_local *)dev->priv;
- unsigned long flags;
- save_flags(flags);
- cli();
- /* Update the statistics from the device registers. */
- lp->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6);
- lp->stats.collisions += (readreg(dev, PP_TxCol) >> 6);
- restore_flags(flags);
- return &lp->stats;
- }
- static void set_multicast_list(struct net_device *dev)
- {
- struct net_local *lp = (struct net_local *)dev->priv;
- if(dev->flags&IFF_PROMISC)
- {
- lp->rx_mode = RX_ALL_ACCEPT;
- }
- else if((dev->flags&IFF_ALLMULTI)||dev->mc_list)
- {
- /* The multicast-accept list is initialized to accept-all, and we
- rely on higher-level filtering for now. */
- lp->rx_mode = RX_MULTCAST_ACCEPT;
- }
- else
- lp->rx_mode = 0;
- writereg(dev, PP_RxCTL, DEF_RX_ACCEPT | lp->rx_mode);
- /* in promiscuous mode, we accept errored packets, so we have to enable interrupts on them also */
- writereg(dev, PP_RxCFG, lp->curr_rx_cfg |
- (lp->rx_mode == RX_ALL_ACCEPT? (RX_CRC_ERROR_ENBL|RX_RUNT_ENBL|RX_EXTRA_DATA_ENBL) : 0));
- }
- static int set_mac_address(struct net_device *dev, void *addr)
- {
- int i;
- if (dev->start)
- return -EBUSY;
- printk("%s: Setting MAC address to ", dev->name);
- for (i = 0; i < 6; i++)
- printk(" %2.2x", dev->dev_addr[i] = ((unsigned char *)addr)[i]);
- printk(".n");
- /* set the Ethernet address */
- for (i=0; i < ETH_ALEN/2; i++)
- writereg(dev, PP_IA+i*2, dev->dev_addr[i*2] | (dev->dev_addr[i*2+1] << 8));
- return 0;
- }
- #ifdef MODULE
- static struct net_device dev_cs89x0;
- static int debug;
- MODULE_PARM(debug, "i");
- MODULE_PARM_DESC(debug, "CS89[02]0 debug level (0-5)");
- MODULE_LICENSE("GPL");
- EXPORT_NO_SYMBOLS;
- int
- init_module(void)
- {
- net_debug = debug;
- dev_cs89x0.init = mac89x0_probe;
- dev_cs89x0.priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
- if (!dev_cs89x0.priv)
- return -ENOMEM;
- memset(dev_cs89x0.priv, 0, sizeof(struct net_local));
- if (register_netdev(&dev_cs89x0) != 0) {
- printk(KERN_WARNING "mac89x0.c: No card foundn");
- kfree(dev_cs89x0.priv);
- return -ENXIO;
- }
- return 0;
- }
- void
- cleanup_module(void)
- {
- #endif
- #ifdef MODULE
- nubus_writew(0, dev_cs89x0.base_addr + ADD_PORT);
- #endif
- #ifdef MODULE
- if (dev_cs89x0.priv != NULL) {
- /* Free up the private structure, or leak memory :-) */
- unregister_netdev(&dev_cs89x0);
- kfree(dev_cs89x0.priv);
- dev_cs89x0.priv = NULL; /* gets re-allocated by cs89x0_probe1 */
- }
- }
- #endif /* MODULE */
- /*
- * Local variables:
- * compile-command: "m68k-linux-gcc -D__KERNEL__ -I../../include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -ffixed-a2 -DMODULE -DMODVERSIONS -include ../../include/linux/modversions.h -c -o mac89x0.o mac89x0.c"
- * version-control: t
- * kept-new-versions: 5
- * c-indent-level: 8
- * tab-width: 8
- * End:
- *
- */