diff options
Diffstat (limited to 'drivers/net/ethernet/cirrus/mac89x0.c')
| -rw-r--r-- | drivers/net/ethernet/cirrus/mac89x0.c | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/drivers/net/ethernet/cirrus/mac89x0.c b/drivers/net/ethernet/cirrus/mac89x0.c new file mode 100644 index 000000000..6324e8096 --- /dev/null +++ b/drivers/net/ethernet/cirrus/mac89x0.c @@ -0,0 +1,574 @@ +/* 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 local_irq_{save,restore}(flags) in net_get_stat, not just + local_irq_{dis,en}able() +*/ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +static const char version[] = +"cs89x0.c:v1.02 11/26/96 Russell Nelson <nelson@crynwr.com>\n"; + +#include <linux/module.h> + +/* + Sources: + + Crynwr packet driver epktisa. + + Crystal Semiconductor data sheets. + +*/ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/in.h> +#include <linux/string.h> +#include <linux/nubus.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/netdevice.h> +#include <linux/platform_device.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/delay.h> +#include <linux/bitops.h> +#include <linux/gfp.h> + +#include <asm/io.h> +#include <asm/hwtest.h> +#include <asm/macints.h> + +#include "cs89x0.h" + +static int debug = -1; +module_param(debug, int, 0); +MODULE_PARM_DESC(debug, "debug message level"); + +/* Information that need to be kept for each board. */ +struct net_local { + int msg_enable; + 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 */ +}; + +/* Index to functions, as function prototypes. */ +static int net_open(struct net_device *dev); +static netdev_tx_t net_send_packet(struct sk_buff *skb, struct net_device *dev); +static irqreturn_t net_interrupt(int irq, void *dev_id); +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); + +/* For reading/writing registers ISA-style */ +static inline int +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 inline void +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 inline int +readreg(struct net_device *dev, int portno) +{ + return swab16(nubus_readw(dev->mem_start + portno)); +} + +static inline void +writereg(struct net_device *dev, int portno, int value) +{ + nubus_writew(swab16(value), dev->mem_start + portno); +} + +static const struct net_device_ops mac89x0_netdev_ops = { + .ndo_open = net_open, + .ndo_stop = net_close, + .ndo_start_xmit = net_send_packet, + .ndo_get_stats = net_get_stats, + .ndo_set_rx_mode = set_multicast_list, + .ndo_set_mac_address = set_mac_address, + .ndo_validate_addr = eth_validate_addr, +}; + +/* 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. */ +static int mac89x0_device_probe(struct platform_device *pdev) +{ + struct net_device *dev; + struct net_local *lp; + int i, slot; + unsigned rev_type = 0; + unsigned long ioaddr; + unsigned short sig; + int err = -ENODEV; + struct nubus_rsrc *fres; + + dev = alloc_etherdev(sizeof(struct net_local)); + if (!dev) + return -ENOMEM; + + /* We might have to parameterize this later */ + slot = 0xE; + /* Get out now if there's a real NuBus card in slot E */ + for_each_func_rsrc(fres) + if (fres->board->slot == slot) + goto out; + + /* The pseudo-ISA bits always live at offset 0x300 (gee, + wonder why...) */ + ioaddr = (unsigned long) + nubus_slot_addr(slot) | (((slot&0xf) << 20) + DEFAULTIOBASE); + { + int card_present; + + card_present = (hwreg_present((void *)ioaddr + 4) && + hwreg_present((void *)ioaddr + DATA_PORT)); + if (!card_present) + goto out; + } + + nubus_writew(0, ioaddr + ADD_PORT); + sig = nubus_readw(ioaddr + DATA_PORT); + if (sig != swab16(CHIP_EISA_ID_SIG)) + goto out; + + SET_NETDEV_DEV(dev, &pdev->dev); + + /* Initialize the net_device structure. */ + lp = netdev_priv(dev); + + lp->msg_enable = netif_msg_init(debug, 0); + + /* 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; + + netif_dbg(lp, drv, dev, "%s", version); + + pr_info("cs89%c0%s rev %c found at %#8lx\n", + 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) { + pr_info("No EEPROM, giving up now.\n"); + goto out1; + } 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); + + /* print the IRQ and ethernet address. */ + + pr_info("MAC %pM, IRQ %d\n", dev->dev_addr, dev->irq); + + dev->netdev_ops = &mac89x0_netdev_ops; + + err = register_netdev(dev); + if (err) + goto out1; + + platform_set_drvdata(pdev, dev); + return 0; +out1: + nubus_writew(0, dev->base_addr + ADD_PORT); +out: + free_netdev(dev); + return 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 +net_open(struct net_device *dev) +{ + struct net_local *lp = netdev_priv(dev); + 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 netdev_tx_t +net_send_packet(struct sk_buff *skb, struct net_device *dev) +{ + struct net_local *lp = netdev_priv(dev); + unsigned long flags; + + netif_dbg(lp, tx_queued, dev, "sent %d byte packet of type %x\n", + 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. */ + local_irq_save(flags); + netif_stop_queue(dev); + + /* 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. */ + local_irq_restore(flags); + return NETDEV_TX_BUSY; + } + + /* Write the contents of the packet */ + skb_copy_from_linear_data(skb, (void *)(dev->mem_start + PP_TxFrame), + skb->len+1); + + local_irq_restore(flags); + dev_kfree_skb (skb); + + return NETDEV_TX_OK; +} + +/* The typical workload of the driver: + Handle the network interface interrupts. */ +static irqreturn_t net_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = dev_id; + struct net_local *lp; + int ioaddr, status; + + ioaddr = dev->base_addr; + lp = netdev_priv(dev); + + /* 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)))) { + netif_dbg(lp, intr, dev, "status=%04x\n", status); + switch(status & ISQ_EVENT_MASK) { + case ISQ_RECEIVER_EVENT: + /* Got a packet(s). */ + net_rx(dev); + break; + case ISQ_TRANSMITTER_EVENT: + dev->stats.tx_packets++; + netif_wake_queue(dev); + if ((status & TX_OK) == 0) + dev->stats.tx_errors++; + if (status & TX_LOST_CRS) + dev->stats.tx_carrier_errors++; + if (status & TX_SQE_ERROR) + dev->stats.tx_heartbeat_errors++; + if (status & TX_LATE_COL) + dev->stats.tx_window_errors++; + if (status & TX_16_COL) + dev->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. */ + netif_wake_queue(dev); + } + if (status & TX_UNDERRUN) { + netif_dbg(lp, tx_err, dev, "transmit underrun\n"); + 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: + dev->stats.rx_missed_errors += (status >> 6); + break; + case ISQ_TX_COL_EVENT: + dev->stats.collisions += (status >> 6); + break; + } + } + return IRQ_HANDLED; +} + +/* 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 = netdev_priv(dev); + struct sk_buff *skb; + int status, length; + + status = readreg(dev, PP_RxStatus); + if ((status & RX_OK) == 0) { + dev->stats.rx_errors++; + if (status & RX_RUNT) + dev->stats.rx_length_errors++; + if (status & RX_EXTRA_DATA) + dev->stats.rx_length_errors++; + if ((status & RX_CRC_ERROR) && + !(status & (RX_EXTRA_DATA|RX_RUNT))) + /* per str 172 */ + dev->stats.rx_crc_errors++; + if (status & RX_DRIBBLE) + dev->stats.rx_frame_errors++; + return; + } + + length = readreg(dev, PP_RxLength); + /* Malloc up new buffer. */ + skb = alloc_skb(length, GFP_ATOMIC); + if (skb == NULL) { + dev->stats.rx_dropped++; + return; + } + skb_put(skb, length); + + skb_copy_to_linear_data(skb, (void *)(dev->mem_start + PP_RxFrame), + length); + + netif_dbg(lp, rx_status, dev, "received %d byte packet of type %x\n", + 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->stats.rx_packets++; + dev->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) +{ + unsigned long flags; + + local_irq_save(flags); + /* Update the statistics from the device registers. */ + dev->stats.rx_missed_errors += (readreg(dev, PP_RxMiss) >> 6); + dev->stats.collisions += (readreg(dev, PP_TxCol) >> 6); + local_irq_restore(flags); + + return &dev->stats; +} + +static void set_multicast_list(struct net_device *dev) +{ + struct net_local *lp = netdev_priv(dev); + + if(dev->flags&IFF_PROMISC) + { + lp->rx_mode = RX_ALL_ACCEPT; + } else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev)) { + /* 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) +{ + struct sockaddr *saddr = addr; + int i; + + if (!is_valid_ether_addr(saddr->sa_data)) + return -EADDRNOTAVAIL; + + memcpy(dev->dev_addr, saddr->sa_data, ETH_ALEN); + netdev_info(dev, "Setting MAC address to %pM\n", dev->dev_addr); + + /* 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; +} + +MODULE_LICENSE("GPL"); + +static int mac89x0_device_remove(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + + unregister_netdev(dev); + nubus_writew(0, dev->base_addr + ADD_PORT); + free_netdev(dev); + return 0; +} + +static struct platform_driver mac89x0_platform_driver = { + .probe = mac89x0_device_probe, + .remove = mac89x0_device_remove, + .driver = { + .name = "mac89x0", + }, +}; + +module_platform_driver(mac89x0_platform_driver); |