diff options
Diffstat (limited to 'linux/src/drivers/net/pcnet32.c')
| -rw-r--r-- | linux/src/drivers/net/pcnet32.c | 970 |
1 files changed, 970 insertions, 0 deletions
diff --git a/linux/src/drivers/net/pcnet32.c b/linux/src/drivers/net/pcnet32.c new file mode 100644 index 00000000..acc5ce74 --- /dev/null +++ b/linux/src/drivers/net/pcnet32.c @@ -0,0 +1,970 @@ +/* pcnet32.c: An AMD PCnet32 ethernet driver for linux. */ +/* + * Copyright 1996,97 Thomas Bogendoerfer, 1993-1995,1998 Donald Becker + * Copyright 1993 United States Government as represented by the + * Director, National Security Agency. + * + * Derived from the lance driver written 1993-1995 by Donald Becker. + * + * This software may be used and distributed according to the terms + * of the GNU Public License, incorporated herein by reference. + * + * This driver is for AMD PCnet-PCI based ethercards + */ + +static const char *version = "pcnet32.c:v0.99B 4/4/98 DJBecker/TSBogend.\n"; + +/* A few user-configurable values. */ + +/* Maximum events (Rx packets, etc.) to handle at each interrupt. */ +static int max_interrupt_work = 20; + +/* + * Set the number of Tx and Rx buffers, using Log_2(# buffers). + * Reasonable default values are 4 Tx buffers, and 16 Rx buffers. + * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4). + */ +#define PCNET_LOG_TX_BUFFERS 4 +#define PCNET_LOG_RX_BUFFERS 4 + +#ifdef MODULE +#ifdef MODVERSIONS +#include <linux/modversions.h> +#endif +#include <linux/module.h> +#include <linux/version.h> +#else +#define MOD_INC_USE_COUNT +#define MOD_DEC_USE_COUNT +#endif + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/ptrace.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/malloc.h> +#include <linux/interrupt.h> +#include <linux/pci.h> +#include <linux/bios32.h> +#include <asm/bitops.h> +#include <asm/io.h> +#include <asm/dma.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> + +/* Driver verbosity level. 0 = no messages, 7 = wordy death. + Modify here, or when loading as a module. */ +static int pcnet32_debug = 1; + +/* + * Theory of Operation + * + * This driver uses the same software structure as the normal lance + * driver. So look for a verbose description in lance.c. The differences + * to the normal lance driver is the use of the 32bit mode of PCnet32 + * and PCnetPCI chips. Because these chips are 32bit chips, there is no + * 16MB limitation and we don't need bounce buffers. + */ + +/* + * History: + * v0.01: Initial version + * only tested on Alpha Noname Board + * v0.02: changed IRQ handling for new interrupt scheme (dev_id) + * tested on a ASUS SP3G + * v0.10: fixed an odd problem with the 79C794 in a Compaq Deskpro XL + * looks like the 974 doesn't like stopping and restarting in a + * short period of time; now we do a reinit of the lance; the + * bug was triggered by doing ifconfig eth0 <ip> broadcast <addr> + * and hangs the machine (thanks to Klaus Liedl for debugging) + * v0.12: by suggestion from Donald Becker: Renamed driver to pcnet32, + * made it standalone (no need for lance.c) + * v0.13: added additional PCI detecting for special PCI devices (Compaq) + * v0.14: stripped down additional PCI probe (thanks to David C Niemi + * and sveneric@xs4all.nl for testing this on their Compaq boxes) + * v0.15: added 79C965 (VLB) probe + * added interrupt sharing for PCI chips + * v0.16: fixed set_multicast_list on Alpha machines + * v0.17: removed hack from dev.c; now pcnet32 uses ethif_probe in Space.c + * v0.19: changed setting of autoselect bit + * v0.20: removed additional Compaq PCI probe; there is now a working one + * in arch/i386/bios32.c + * v0.21: added endian conversion for ppc, from work by cort@cs.nmt.edu + * v0.22: added printing of status to ring dump + * v0.23: changed enet_statistics to net_devive_stats + * v0.99: Changes for 2.0.34 final release. -djb + */ + + +#ifndef __powerpc__ +#define le16_to_cpu(val) (val) +#define le32_to_cpu(val) (val) +#endif +#if (LINUX_VERSION_CODE < 0x20123) +#define test_and_set_bit(val, addr) set_bit(val, addr) +#endif + +#define TX_RING_SIZE (1 << (PCNET_LOG_TX_BUFFERS)) +#define TX_RING_MOD_MASK (TX_RING_SIZE - 1) +#define TX_RING_LEN_BITS ((PCNET_LOG_TX_BUFFERS) << 12) + +#define RX_RING_SIZE (1 << (PCNET_LOG_RX_BUFFERS)) +#define RX_RING_MOD_MASK (RX_RING_SIZE - 1) +#define RX_RING_LEN_BITS ((PCNET_LOG_RX_BUFFERS) << 4) + +#define PKT_BUF_SZ 1544 + +/* Offsets from base I/O address. */ +enum pcnet_offsets { PCNET32_DATA=0x10, PCNET32_ADDR=0x12, PCNET32_RESET=0x14, + PCNET32_BUS_IF=0x16,}; +#define PCNET32_TOTAL_SIZE 0x20 + +/* The PCNET32 Rx and Tx ring descriptors. */ +struct pcnet32_rx_head { + u32 base; + s16 buf_length; + s16 status; + u32 msg_length; + u32 reserved; +}; + +struct pcnet32_tx_head { + u32 base; + s16 length; + s16 status; + u32 misc; + u32 reserved; +}; + +/* The PCNET32 32-Bit initialization block, described in databook. */ +struct pcnet32_init_block { + u16 mode; + u16 tlen_rlen; + u8 phys_addr[6]; + u16 reserved; + u32 filter[2]; + /* Receive and transmit ring base, along with extra bits. */ + u32 rx_ring; + u32 tx_ring; +}; + +struct pcnet32_private { + /* The Tx and Rx ring entries must be aligned on 16-byte boundaries + in 32bit mode. */ + struct pcnet32_rx_head rx_ring[RX_RING_SIZE]; + struct pcnet32_tx_head tx_ring[TX_RING_SIZE]; + struct pcnet32_init_block init_block; + const char *name; + struct device *next_module; + /* The saved address of a sent-in-place packet/buffer, for skfree(). */ + struct sk_buff* tx_skbuff[TX_RING_SIZE]; + unsigned long rx_buffs; /* Address of Rx and Tx buffers. */ + int cur_rx, cur_tx; /* The next free ring entry */ + int dirty_rx, dirty_tx; /* The ring entries to be free()ed. */ + struct enet_statistics stats; + char tx_full; + unsigned long lock; +}; + +static struct pcnet_chip_type { + int id_number; + const char *name; + int flags; +} chip_table[] = { + {0x2420, "PCnet/PCI 79C970", 0}, + {0x2430, "PCnet32", 0}, + {0x2621, "PCnet/PCI II 79C970A", 0}, + {0x2623, "PCnet/FAST 79C971", 0}, + {0x2624, "PCnet/FAST+ 79C972", 0}, + {0x0, "PCnet32 (unknown)", 0}, +}; + +/* Index of functions. */ +int pcnet32_probe(struct device *dev); +static int pcnet32_probe1(struct device *dev, unsigned int ioaddr, unsigned char irq_line); +static int pcnet32_open(struct device *dev); +static void pcnet32_init_ring(struct device *dev); +static int pcnet32_start_xmit(struct sk_buff *skb, struct device *dev); +static int pcnet32_rx(struct device *dev); +static void pcnet32_interrupt(int irq, void *dev_id, struct pt_regs *regs); +static int pcnet32_close(struct device *dev); +static struct enet_statistics *pcnet32_get_stats(struct device *dev); +static void pcnet32_set_multicast_list(struct device *dev); + + +/* A list of all installed PCnet32 devices, for removing the driver module. */ +static struct device *root_pcnet32_dev = NULL; + +int pcnet32_probe (struct device *dev) +{ + static int pci_index = 0; /* Static, for multiple probe calls. */ + int cards_found = 0; + + if ( ! pcibios_present()) + return ENODEV; + + for (;pci_index < 0xff; pci_index++) { + u8 irq_line; + u16 pci_command, new_command; + unsigned char pci_bus, pci_device_fn; + u32 pci_ioaddr; + + if (pcibios_find_device (PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE, + pci_index, &pci_bus, &pci_device_fn) + != PCIBIOS_SUCCESSFUL) + break; + + pcibios_read_config_byte(pci_bus, pci_device_fn, + PCI_INTERRUPT_LINE, &irq_line); + pcibios_read_config_dword(pci_bus, pci_device_fn, + PCI_BASE_ADDRESS_0, &pci_ioaddr); + /* Remove I/O space marker in bit 0. */ + pci_ioaddr &= ~3; + + /* Avoid already found cards from previous pcnet32_probe() calls */ + if (check_region(pci_ioaddr, PCNET32_TOTAL_SIZE)) + continue; + + /* Activate the card: fix for brain-damaged Win98 BIOSes. */ + pcibios_read_config_word(pci_bus, pci_device_fn, + PCI_COMMAND, &pci_command); + new_command = pci_command | PCI_COMMAND_MASTER|PCI_COMMAND_IO; + if (pci_command != new_command) { + printk(KERN_INFO " The PCI BIOS has not enabled the AMD Ethernet" + " device at %2x-%2x." + " Updating PCI command %4.4x->%4.4x.\n", + pci_bus, pci_device_fn, pci_command, new_command); + pcibios_write_config_word(pci_bus, pci_device_fn, + PCI_COMMAND, new_command); + } + + if (pcnet32_probe1(dev, pci_ioaddr, irq_line) != 0) { + /* Should never happen. */ + printk(KERN_ERR "pcnet32.c: Probe of PCI card at %#x failed.\n", + pci_ioaddr); + } else + dev = 0; + cards_found++; + } + + return cards_found ? 0 : -ENODEV; +} + + +/* pcnet32_probe1 */ +static int pcnet32_probe1(struct device *dev, unsigned int ioaddr, unsigned char irq_line) +{ + struct pcnet32_private *lp; + int i; + const char *chipname; + + /* check if there is really a pcnet chip on that ioaddr */ + if ((inb(ioaddr + 14) != 0x57) || (inb(ioaddr + 15) != 0x57)) + return ENODEV; + + inw(ioaddr+PCNET32_RESET); /* Reset the PCNET32 */ + + outw(0x0000, ioaddr+PCNET32_ADDR); /* Switch to window 0 */ + if (inw(ioaddr+PCNET32_DATA) != 0x0004) + return ENODEV; + + /* Get the version of the chip. */ + outw(88, ioaddr+PCNET32_ADDR); + if (inw(ioaddr+PCNET32_ADDR) != 88) { + /* should never happen */ + return ENODEV; + } else { /* Good, it's a newer chip. */ + int chip_version = inw(ioaddr+PCNET32_DATA); + outw(89, ioaddr+PCNET32_ADDR); + chip_version |= inw(ioaddr+PCNET32_DATA) << 16; + if (pcnet32_debug > 2) + printk(" PCnet chip version is %#x.\n", chip_version); + if ((chip_version & 0xfff) != 0x003) + return ENODEV; + chip_version = (chip_version >> 12) & 0xffff; + for (i = 0; chip_table[i].id_number; i++) + if (chip_table[i].id_number == chip_version) + break; + chipname = chip_table[i].name; + } + + dev = init_etherdev(dev, 0); + + printk("%s: %s at %#3x,", dev->name, chipname, ioaddr); + + /* There is a 16 byte station address PROM at the base address. + The first six bytes are the station address. */ + for (i = 0; i < 6; i++) + printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i)); + + printk("\n"); + + dev->base_addr = ioaddr; + request_region(ioaddr, PCNET32_TOTAL_SIZE, dev->name); + + /* Data structures used by the PCnet32 are 16byte aligned and DMAble. */ + lp = (struct pcnet32_private *) + (((unsigned long)kmalloc(sizeof(*lp)+15, GFP_DMA | GFP_KERNEL)+15) & ~15); + + memset(lp, 0, sizeof(*lp)); + dev->priv = lp; + + lp->next_module = root_pcnet32_dev; + root_pcnet32_dev = dev; + + lp->name = chipname; + lp->rx_buffs = (unsigned long) kmalloc(PKT_BUF_SZ*RX_RING_SIZE, GFP_DMA | GFP_KERNEL); + + lp->init_block.mode = le16_to_cpu(0x0003); /* Disable Rx and Tx. */ + lp->init_block.tlen_rlen = le16_to_cpu(TX_RING_LEN_BITS | RX_RING_LEN_BITS); + for (i = 0; i < 6; i++) + lp->init_block.phys_addr[i] = dev->dev_addr[i]; + lp->init_block.filter[0] = 0x00000000; + lp->init_block.filter[1] = 0x00000000; + lp->init_block.rx_ring = (u32)le32_to_cpu(virt_to_bus(lp->rx_ring)); + lp->init_block.tx_ring = (u32)le32_to_cpu(virt_to_bus(lp->tx_ring)); + + /* switch pcnet32 to 32bit mode */ + outw(0x0014, ioaddr+PCNET32_ADDR); + outw(0x0002, ioaddr+PCNET32_BUS_IF); + + outw(0x0001, ioaddr+PCNET32_ADDR); + inw(ioaddr+PCNET32_ADDR); + outw(virt_to_bus(&lp->init_block) & 0xffff, ioaddr+PCNET32_DATA); + outw(0x0002, ioaddr+PCNET32_ADDR); + inw(ioaddr+PCNET32_ADDR); + outw(virt_to_bus(&lp->init_block) >> 16, ioaddr+PCNET32_DATA); + outw(0x0000, ioaddr+PCNET32_ADDR); + inw(ioaddr+PCNET32_ADDR); + + dev->irq = irq_line; + + if (pcnet32_debug > 0) + printk(version); + + /* The PCNET32-specific entries in the device structure. */ + dev->open = &pcnet32_open; + dev->hard_start_xmit = &pcnet32_start_xmit; + dev->stop = &pcnet32_close; + dev->get_stats = &pcnet32_get_stats; + dev->set_multicast_list = &pcnet32_set_multicast_list; + + /* Fill in the generic fields of the device structure. */ + ether_setup(dev); + return 0; +} + + +static int +pcnet32_open(struct device *dev) +{ + struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv; + unsigned int ioaddr = dev->base_addr; + int i; + + if (dev->irq == 0 || + request_irq(dev->irq, &pcnet32_interrupt, SA_SHIRQ, + dev->name, (void *)dev)) { + return -EAGAIN; + } + MOD_INC_USE_COUNT; + + /* Reset the PCNET32 */ + inw(ioaddr+PCNET32_RESET); + + /* switch pcnet32 to 32bit mode */ + outw(0x0014, ioaddr+PCNET32_ADDR); + outw(0x0002, ioaddr+PCNET32_BUS_IF); + + /* Turn on auto-select of media (AUI, BNC). */ + outw(0x0002, ioaddr+PCNET32_ADDR); + /* only touch autoselect bit */ + outw(inw(ioaddr+PCNET32_BUS_IF) | 0x0002, ioaddr+PCNET32_BUS_IF); + + if (pcnet32_debug > 1) + printk("%s: pcnet32_open() irq %d tx/rx rings %#x/%#x init %#x.\n", + dev->name, dev->irq, + (u32) virt_to_bus(lp->tx_ring), + (u32) virt_to_bus(lp->rx_ring), + (u32) virt_to_bus(&lp->init_block)); + + /* check for ATLAS T1/E1 LAW card */ + if (dev->dev_addr[0] == 0x00 && dev->dev_addr[1] == 0xe0 && dev->dev_addr[2] == 0x75) { + /* select GPSI mode */ + lp->init_block.mode = 0x0100; + outw(0x0002, ioaddr+PCNET32_ADDR); + outw(inw(ioaddr+PCNET32_BUS_IF) & ~2, ioaddr+PCNET32_BUS_IF); + /* switch full duplex on */ + outw(0x0009, ioaddr+PCNET32_ADDR); + outw(inw(ioaddr+PCNET32_BUS_IF) | 1, ioaddr+PCNET32_BUS_IF); + } else + lp->init_block.mode = 0x0000; + lp->init_block.filter[0] = 0x00000000; + lp->init_block.filter[1] = 0x00000000; + pcnet32_init_ring(dev); + + /* Re-initialize the PCNET32, and start it when done. */ + outw(0x0001, ioaddr+PCNET32_ADDR); + outw(virt_to_bus(&lp->init_block) &0xffff, ioaddr+PCNET32_DATA); + outw(0x0002, ioaddr+PCNET32_ADDR); + outw(virt_to_bus(&lp->init_block) >> 16, ioaddr+PCNET32_DATA); + + outw(0x0004, ioaddr+PCNET32_ADDR); + outw(0x0915, ioaddr+PCNET32_DATA); + + outw(0x0000, ioaddr+PCNET32_ADDR); + outw(0x0001, ioaddr+PCNET32_DATA); + + dev->tbusy = 0; + dev->interrupt = 0; + dev->start = 1; + i = 0; + while (i++ < 100) + if (inw(ioaddr+PCNET32_DATA) & 0x0100) + break; + /* + * We used to clear the InitDone bit, 0x0100, here but Mark Stockton + * reports that doing so triggers a bug in the '974. + */ + outw(0x0042, ioaddr+PCNET32_DATA); + + if (pcnet32_debug > 2) + printk("%s: PCNET32 open after %d ticks, init block %#x csr0 %4.4x.\n", + dev->name, i, (u32) virt_to_bus(&lp->init_block), inw(ioaddr+PCNET32_DATA)); + + return 0; /* Always succeed */ +} + +/* + * The LANCE has been halted for one reason or another (busmaster memory + * arbitration error, Tx FIFO underflow, driver stopped it to reconfigure, + * etc.). Modern LANCE variants always reload their ring-buffer + * configuration when restarted, so we must reinitialize our ring + * context before restarting. As part of this reinitialization, + * find all packets still on the Tx ring and pretend that they had been + * sent (in effect, drop the packets on the floor) - the higher-level + * protocols will time out and retransmit. It'd be better to shuffle + * these skbs to a temp list and then actually re-Tx them after + * restarting the chip, but I'm too lazy to do so right now. dplatt@3do.com + */ + +static void +pcnet32_purge_tx_ring(struct device *dev) +{ + struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv; + int i; + + for (i = 0; i < TX_RING_SIZE; i++) { + if (lp->tx_skbuff[i]) { + dev_kfree_skb(lp->tx_skbuff[i], FREE_WRITE); + lp->tx_skbuff[i] = NULL; + } + } +} + + +/* Initialize the PCNET32 Rx and Tx rings. */ +static void +pcnet32_init_ring(struct device *dev) +{ + struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv; + int i; + + lp->lock = 0, lp->tx_full = 0; + lp->cur_rx = lp->cur_tx = 0; + lp->dirty_rx = lp->dirty_tx = 0; + + for (i = 0; i < RX_RING_SIZE; i++) { + lp->rx_ring[i].base = (u32)le32_to_cpu(virt_to_bus((char *)lp->rx_buffs + i*PKT_BUF_SZ)); + lp->rx_ring[i].buf_length = le16_to_cpu(-PKT_BUF_SZ); + lp->rx_ring[i].status = le16_to_cpu(0x8000); + } + /* The Tx buffer address is filled in as needed, but we do need to clear + the upper ownership bit. */ + for (i = 0; i < TX_RING_SIZE; i++) { + lp->tx_ring[i].base = 0; + lp->tx_ring[i].status = 0; + } + + lp->init_block.tlen_rlen = TX_RING_LEN_BITS | RX_RING_LEN_BITS; + for (i = 0; i < 6; i++) + lp->init_block.phys_addr[i] = dev->dev_addr[i]; + lp->init_block.rx_ring = (u32)le32_to_cpu(virt_to_bus(lp->rx_ring)); + lp->init_block.tx_ring = (u32)le32_to_cpu(virt_to_bus(lp->tx_ring)); +} + +static void +pcnet32_restart(struct device *dev, unsigned int csr0_bits, int must_reinit) +{ + int i; + unsigned int ioaddr = dev->base_addr; + + pcnet32_purge_tx_ring(dev); + pcnet32_init_ring(dev); + + outw(0x0000, ioaddr + PCNET32_ADDR); + /* ReInit Ring */ + outw(0x0001, ioaddr + PCNET32_DATA); + i = 0; + while (i++ < 100) + if (inw(ioaddr+PCNET32_DATA) & 0x0100) + break; + + outw(csr0_bits, ioaddr + PCNET32_DATA); +} + +static int +pcnet32_start_xmit(struct sk_buff *skb, struct device *dev) +{ + struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv; + unsigned int ioaddr = dev->base_addr; + int entry; + unsigned long flags; + + /* Transmitter timeout, serious problems. */ + if (dev->tbusy) { + int tickssofar = jiffies - dev->trans_start; + if (tickssofar < 20) + return 1; + outw(0, ioaddr+PCNET32_ADDR); + printk("%s: transmit timed out, status %4.4x, resetting.\n", + dev->name, inw(ioaddr+PCNET32_DATA)); + outw(0x0004, ioaddr+PCNET32_DATA); + lp->stats.tx_errors++; +#ifndef final_version + { + int i; + printk(" Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.", + lp->dirty_tx, lp->cur_tx, lp->tx_full ? " (full)" : "", + lp->cur_rx); + for (i = 0 ; i < RX_RING_SIZE; i++) + printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ", + lp->rx_ring[i].base, -lp->rx_ring[i].buf_length, + lp->rx_ring[i].msg_length, (unsigned)lp->rx_ring[i].status); + for (i = 0 ; i < TX_RING_SIZE; i++) + printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ", + lp->tx_ring[i].base, -lp->tx_ring[i].length, + lp->tx_ring[i].misc, (unsigned)lp->tx_ring[i].status); + printk("\n"); + } +#endif + pcnet32_restart(dev, 0x0042, 1); + + dev->tbusy = 0; + dev->trans_start = jiffies; + + return 0; + } + + if (pcnet32_debug > 3) { + outw(0x0000, ioaddr+PCNET32_ADDR); + printk("%s: pcnet32_start_xmit() called, csr0 %4.4x.\n", dev->name, + inw(ioaddr+PCNET32_DATA)); + outw(0x0000, ioaddr+PCNET32_DATA); + } + + /* 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); + return 1; + } + + if (test_and_set_bit(0, (void*)&lp->lock) != 0) { + if (pcnet32_debug > 0) + printk("%s: tx queue lock!.\n", dev->name); + /* don't clear dev->tbusy flag. */ + return 1; + } + + /* Fill in a Tx ring entry */ + + /* Mask to ring buffer boundary. */ + entry = lp->cur_tx & TX_RING_MOD_MASK; + + /* Caution: the write order is important here, set the base address + with the "ownership" bits last. */ + + lp->tx_ring[entry].length = le16_to_cpu(-skb->len); + + lp->tx_ring[entry].misc = 0x00000000; + + lp->tx_skbuff[entry] = skb; + lp->tx_ring[entry].base = (u32)le32_to_cpu(virt_to_bus(skb->data)); + lp->tx_ring[entry].status = le16_to_cpu(0x8300); + + lp->cur_tx++; + + /* Trigger an immediate send poll. */ + outw(0x0000, ioaddr+PCNET32_ADDR); + outw(0x0048, ioaddr+PCNET32_DATA); + + dev->trans_start = jiffies; + + save_flags(flags); + cli(); + lp->lock = 0; + if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0) + clear_bit(0, (void*)&dev->tbusy); + else + lp->tx_full = 1; + restore_flags(flags); + + return 0; +} + +/* The PCNET32 interrupt handler. */ +static void +pcnet32_interrupt(int irq, void *dev_id, struct pt_regs * regs) +{ + struct device *dev = (struct device *)dev_id; + struct pcnet32_private *lp; + unsigned int csr0, ioaddr; + int boguscnt = max_interrupt_work; + int must_restart; + + if (dev == NULL) { + printk ("pcnet32_interrupt(): irq %d for unknown device.\n", irq); + return; + } + + ioaddr = dev->base_addr; + lp = (struct pcnet32_private *)dev->priv; + if (dev->interrupt) + printk("%s: Re-entering the interrupt handler.\n", dev->name); + + dev->interrupt = 1; + + outw(0x00, dev->base_addr + PCNET32_ADDR); + while ((csr0 = inw(dev->base_addr + PCNET32_DATA)) & 0x8600 + && --boguscnt >= 0) { + /* Acknowledge all of the current interrupt sources ASAP. */ + outw(csr0 & ~0x004f, dev->base_addr + PCNET32_DATA); + + must_restart = 0; + + if (pcnet32_debug > 5) + printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n", + dev->name, csr0, inw(dev->base_addr + PCNET32_DATA)); + + if (csr0 & 0x0400) /* Rx interrupt */ + pcnet32_rx(dev); + + if (csr0 & 0x0200) { /* Tx-done interrupt */ + int dirty_tx = lp->dirty_tx; + + while (dirty_tx < lp->cur_tx) { + int entry = dirty_tx & TX_RING_MOD_MASK; + int status = (short)le16_to_cpu(lp->tx_ring[entry].status); + + if (status < 0) + break; /* It still hasn't been Txed */ + + lp->tx_ring[entry].base = 0; + + if (status & 0x4000) { + /* There was an major error, log it. */ + int err_status = le16_to_cpu(lp->tx_ring[entry].misc); + lp->stats.tx_errors++; + if (err_status & 0x04000000) lp->stats.tx_aborted_errors++; + if (err_status & 0x08000000) lp->stats.tx_carrier_errors++; + if (err_status & 0x10000000) lp->stats.tx_window_errors++; + if (err_status & 0x40000000) { + /* Ackk! On FIFO errors the Tx unit is turned off! */ + lp->stats.tx_fifo_errors++; + /* Remove this verbosity later! */ + printk("%s: Tx FIFO error! Status %4.4x.\n", + dev->name, csr0); + /* Restart the chip. */ + must_restart = 1; + } + } else { + if (status & 0x1800) + lp->stats.collisions++; + lp->stats.tx_packets++; + } + + /* We must free the original skb */ + if (lp->tx_skbuff[entry]) { + dev_kfree_skb(lp->tx_skbuff[entry], FREE_WRITE); + lp->tx_skbuff[entry] = 0; + } + dirty_tx++; + } + +#ifndef final_version + if (lp->cur_tx - dirty_tx >= TX_RING_SIZE) { + printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n", + dirty_tx, lp->cur_tx, lp->tx_full); + dirty_tx += TX_RING_SIZE; + } +#endif + + if (lp->tx_full && dev->tbusy + && dirty_tx > lp->cur_tx - TX_RING_SIZE + 2) { + /* The ring is no longer full, clear tbusy. */ + lp->tx_full = 0; + clear_bit(0, (void*)&dev->tbusy); + mark_bh(NET_BH); + } + + lp->dirty_tx = dirty_tx; + } + + /* Log misc errors. */ + if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */ + if (csr0 & 0x1000) { + /* + * this happens when our receive ring is full. This + * shouldn't be a problem as we will see normal rx + * interrupts for the frames in the receive ring. But + * there are some PCI chipsets (I can reproduce this + * on SP3G with Intel saturn chipset) which have some- + * times problems and will fill up the receive ring + * with error descriptors. In this situation we don't + * get a rx interrupt, but a missed frame interrupt + * sooner or later. So we try to clean up our receive + * ring here. + */ + pcnet32_rx(dev); + lp->stats.rx_errors++; /* Missed a Rx frame. */ + } + if (csr0 & 0x0800) { + printk("%s: Bus master arbitration failure, status %4.4x.\n", + dev->name, csr0); + /* Restart the chip. */ + must_restart = 1; + } + + if (must_restart) { + /* stop the chip to clear the error condition, then restart */ + outw(0x0000, dev->base_addr + PCNET32_ADDR); + outw(0x0004, dev->base_addr + PCNET32_DATA); + pcnet32_restart(dev, 0x0002, 0); + } + } + + /* Clear any other interrupt, and set interrupt enable. */ + outw(0x0000, dev->base_addr + PCNET32_ADDR); + outw(0x7940, dev->base_addr + PCNET32_DATA); + + if (pcnet32_debug > 4) + printk("%s: exiting interrupt, csr%d=%#4.4x.\n", + dev->name, inw(ioaddr + PCNET32_ADDR), + inw(dev->base_addr + PCNET32_DATA)); + + dev->interrupt = 0; + return; +} + +static int +pcnet32_rx(struct device *dev) +{ + struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv; + int entry = lp->cur_rx & RX_RING_MOD_MASK; + int i; + + /* If we own the next entry, it's a new packet. Send it up. */ + while ((short)le16_to_cpu(lp->rx_ring[entry].status) >= 0) { + int status = (short)le16_to_cpu(lp->rx_ring[entry].status) >> 8; + + if (status != 0x03) { /* There was an error. */ + /* There is a tricky error noted by John Murphy, + <murf@perftech.com> to Russ Nelson: Even with full-sized + buffers it's possible for a jabber packet to use two + buffers, with only the last correctly noting the error. */ + if (status & 0x01) /* Only count a general error at the */ + lp->stats.rx_errors++; /* end of a packet.*/ + if (status & 0x20) lp->stats.rx_frame_errors++; + if (status & 0x10) lp->stats.rx_over_errors++; + if (status & 0x08) lp->stats.rx_crc_errors++; + if (status & 0x04) lp->stats.rx_fifo_errors++; + lp->rx_ring[entry].status &= le16_to_cpu(0x03ff); + } + else + { + /* Malloc up new buffer, compatible with net-2e. */ + short pkt_len = (le32_to_cpu(lp->rx_ring[entry].msg_length) & 0xfff)-4; + struct sk_buff *skb; + + if(pkt_len < 60) { + printk("%s: Runt packet!\n",dev->name); + lp->stats.rx_errors++; + } else { + skb = dev_alloc_skb(pkt_len+2); + if (skb == NULL) { + printk("%s: Memory squeeze, deferring packet.\n", + dev->name); + for (i=0; i < RX_RING_SIZE; i++) + if ((short)le16_to_cpu(lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].status) < 0) + break; + + if (i > RX_RING_SIZE -2) + { + lp->stats.rx_dropped++; + lp->rx_ring[entry].status |= le16_to_cpu(0x8000); + lp->cur_rx++; + } + break; + } + skb->dev = dev; + skb_reserve(skb,2); /* 16 byte align */ + skb_put(skb,pkt_len); /* Make room */ + eth_copy_and_sum(skb, + (unsigned char *)bus_to_virt(le32_to_cpu(lp->rx_ring[entry].base)), + pkt_len,0); + skb->protocol=eth_type_trans(skb,dev); + netif_rx(skb); + lp->stats.rx_packets++; + } + } + /* The docs say that the buffer length isn't touched, but Andrew Boyd + of QNX reports that some revs of the 79C965 clear it. */ + lp->rx_ring[entry].buf_length = le16_to_cpu(-PKT_BUF_SZ); + lp->rx_ring[entry].status |= le16_to_cpu(0x8000); + entry = (++lp->cur_rx) & RX_RING_MOD_MASK; + } + + /* We should check that at least two ring entries are free. If not, + we should free one and mark stats->rx_dropped++. */ + + return 0; +} + +static int +pcnet32_close(struct device *dev) +{ + unsigned int ioaddr = dev->base_addr; + struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv; + + dev->start = 0; + set_bit(0, (void*)&dev->tbusy); + + outw(112, ioaddr+PCNET32_ADDR); + lp->stats.rx_missed_errors = inw(ioaddr+PCNET32_DATA); + + outw(0, ioaddr+PCNET32_ADDR); + + if (pcnet32_debug > 1) + printk("%s: Shutting down ethercard, status was %2.2x.\n", + dev->name, inw(ioaddr+PCNET32_DATA)); + + /* We stop the PCNET32 here -- it occasionally polls + memory if we don't. */ + outw(0x0004, ioaddr+PCNET32_DATA); + + free_irq(dev->irq, dev); + MOD_DEC_USE_COUNT; + + return 0; +} + +static struct enet_statistics *pcnet32_get_stats(struct device *dev) +{ + struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv; + unsigned int ioaddr = dev->base_addr; + unsigned short saved_addr; + unsigned long flags; + + save_flags(flags); + cli(); + saved_addr = inw(ioaddr+PCNET32_ADDR); + outw(112, ioaddr+PCNET32_ADDR); + lp->stats.rx_missed_errors = inw(ioaddr+PCNET32_DATA); + outw(saved_addr, ioaddr+PCNET32_ADDR); + restore_flags(flags); + + return &lp->stats; +} + +/* Set or clear the multicast filter for this adaptor. + */ + +static void pcnet32_set_multicast_list(struct device *dev) +{ + unsigned int ioaddr = dev->base_addr; + struct pcnet32_private *lp = (struct pcnet32_private *)dev->priv; + + if (dev->flags&IFF_PROMISC) { + /* Log any net taps. */ + printk("%s: Promiscuous mode enabled.\n", dev->name); + lp->init_block.mode |= 0x8000; + } else { + int num_addrs=dev->mc_count; + if(dev->flags&IFF_ALLMULTI) + num_addrs=1; + /* FIXIT: We don't use the multicast table, but rely on upper-layer filtering. */ + memset(lp->init_block.filter , (num_addrs == 0) ? 0 : -1, sizeof(lp->init_block.filter)); + lp->init_block.mode &= ~0x8000; + } + + outw(0, ioaddr+PCNET32_ADDR); + outw(0x0004, ioaddr+PCNET32_DATA); /* Temporarily stop the lance. */ + + pcnet32_restart(dev, 0x0042, 0); /* Resume normal operation */ + +} + + +#ifdef MODULE +#if LINUX_VERSION_CODE > 0x20118 +MODULE_AUTHOR("Donald Becker <becker@cesdis.gsfc.nasa.gov>"); +MODULE_DESCRIPTION("AMD PCnet/PCI ethernet driver"); +MODULE_PARM(debug, "i"); +MODULE_PARM(max_interrupt_work, "i"); +MODULE_PARM(rx_copybreak, "i"); +MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i"); +MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i"); +#endif + +/* An additional parameter that may be passed in... */ +static int debug = -1; + +int +init_module(void) +{ + if (debug >= 0) + pcnet32_debug = debug; + +#ifdef CARDBUS + register_driver(&pcnet32_ops); + return 0; +#else + return pcnet32_probe(NULL); +#endif +} + +void +cleanup_module(void) +{ + struct device *next_dev; + +#ifdef CARDBUS + unregister_driver(&pcnet32_ops); +#endif + + /* No need to check MOD_IN_USE, as sys_delete_module() checks. */ + while (root_pcnet32_dev) { + next_dev = ((struct pcnet32_private *)root_pcnet32_dev->priv)->next_module; + unregister_netdev(root_pcnet32_dev); + release_region(root_pcnet32_dev->base_addr, PCNET32_TOTAL_SIZE); + kfree(root_pcnet32_dev); + root_pcnet32_dev = next_dev; + } +} + +#endif /* MODULE */ + + +/* + * Local variables: + * compile-command: "gcc -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -c pcnet32.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`" + * c-indent-level: 4 + * c-basic-offset: 4 + * tab-width: 4 + * End: + */ |