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- /* lance.c: An AMD LANCE ethernet driver for linux. */
- /*
- Written 1993,1994,1995 by Donald Becker.
-
- Copyright 1993 United States Government as represented by the
- Director, National Security Agency.
- This software may be used and distributed according to the terms
- of the GNU Public License, incorporated herein by reference.
-
- This driver is for the Allied Telesis AT1500 and HP J2405A, and should work
- with most other LANCE-based bus-master (NE2100 clone) ethercards.
-
- The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
- Center of Excellence in Space Data and Information Sciences
- Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
- */
-
- static char *version = "lance.c:v1.07 1/18/95 becker@cesdis.gsfc.nasa.gov\n";
-
- #include <linux/config.h>
- #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>
-
- struct device *init_etherdev(struct device *dev, int sizeof_private,
- unsigned long *mem_startp);
- static unsigned int lance_portlist[] = {0x300, 0x320, 0x340, 0x360, 0};
- unsigned long lance_probe1(int ioaddr, unsigned long mem_start);
-
- #ifdef HAVE_DEVLIST
- struct netdev_entry lance_drv =
- {"lance", lance_probe1, LANCE_TOTAL_SIZE, lance_portlist};
- #endif
-
- #ifdef LANCE_DEBUG
- int lance_debug = LANCE_DEBUG;
- #else
- int lance_debug = 1;
- #endif
-
- /*
- Theory of Operation
-
- I. Board Compatibility
-
- This device driver is designed for the AMD 79C960, the "PCnet-ISA
- single-chip ethernet controller for ISA". This chip is used in a wide
- variety of boards from vendors such as Allied Telesis, HP, Kingston,
- and Boca. This driver is also intended to work with older AMD 7990
- designs, such as the NE1500 and NE2100, and newer 79C961. For convenience,
- I use the name LANCE to refer to all of the AMD chips, even though it properly
- refers only to the original 7990.
-
- II. Board-specific settings
-
- The driver is designed to work the boards that use the faster
- bus-master mode, rather than in shared memory mode. (Only older designs
- have on-board buffer memory needed to support the slower shared memory mode.)
-
- Most ISA boards have jumpered settings for the I/O base, IRQ line, and DMA
- channel. This driver probes the likely base addresses:
- {0x300, 0x320, 0x340, 0x360}.
- After the board is found it generates a DMA-timeout interrupt and uses
- autoIRQ to find the IRQ line. The DMA channel can be set with the low bits
- of the otherwise-unused dev->mem_start value (aka PARAM1). If unset it is
- probed for by enabling each free DMA channel in turn and checking if
- initialization succeeds.
-
- The HP-J2405A board is an exception: with this board it's easy to read the
- EEPROM-set values for the base, IRQ, and DMA. (Of course you must already
- _know_ the base address -- that field is for writing the EEPROM.)
-
- III. Driver operation
-
- IIIa. Ring buffers
- The LANCE uses ring buffers of Tx and Rx descriptors. Each entry describes
- the base and length of the data buffer, along with status bits. The length
- of these buffers is set by LANCE_LOG_{RX,TX}_BUFFERS, which is log_2() of
- the buffer length (rather than being directly the buffer length) for
- implementation ease. The current values are 2 (Tx) and 4 (Rx), which leads to
- ring sizes of 4 (Tx) and 16 (Rx). Increasing the number of ring entries
- needlessly uses extra space and reduces the chance that an upper layer will
- be able to reorder queued Tx packets based on priority. Decreasing the number
- of entries makes it more difficult to achieve back-to-back packet transmission
- and increases the chance that Rx ring will overflow. (Consider the worst case
- of receiving back-to-back minimum-sized packets.)
-
- The LANCE has the capability to "chain" both Rx and Tx buffers, but this driver
- statically allocates full-sized (slightly oversized -- PKT_BUF_SZ) buffers to
- avoid the administrative overhead. For the Rx side this avoids dynamically
- allocating full-sized buffers "just in case", at the expense of a
- memory-to-memory data copy for each packet received. For most systems this
- is a good tradeoff: the Rx buffer will always be in low memory, the copy
- is inexpensive, and it primes the cache for later packet processing. For Tx
- the buffers are only used when needed as low-memory bounce buffers.
-
- IIIB. 16M memory limitations.
- For the ISA bus master mode all structures used directly by the LANCE,
- the initialization block, Rx and Tx rings, and data buffers, must be
- accessible from the ISA bus, i.e. in the lower 16M of real memory.
- This is a problem for current Linux kernels on >16M machines. The network
- devices are initialized after memory initialization, and the kernel doles out
- memory from the top of memory downward. The current solution is to have a
- special network initialization routine that's called before memory
- initialization; this will eventually be generalized for all network devices.
- As mentioned before, low-memory "bounce-buffers" are used when needed.
-
- IIIC. Synchronization
- The driver runs as two independent, single-threaded flows of control. One
- is the send-packet routine, which enforces single-threaded use by the
- dev->tbusy flag. The other thread is the interrupt handler, which is single
- threaded by the hardware and other software.
-
- The send packet thread has partial control over the Tx ring and 'dev->tbusy'
- flag. It sets the tbusy flag whenever it's queuing a Tx packet. If the next
- queue slot is empty, it clears the tbusy flag when finished otherwise it sets
- the 'lp->tx_full' flag.
-
- The interrupt handler has exclusive control over the Rx ring and records stats
- from the Tx ring. (The Tx-done interrupt can't be selectively turned off, so
- we can't avoid the interrupt overhead by having the Tx routine reap the Tx
- stats.) After reaping the stats, it marks the queue entry as empty by setting
- the 'base' to zero. Iff the 'lp->tx_full' flag is set, it clears both the
- tx_full and tbusy flags.
-
- */
-
- /* 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). */
- #ifndef LANCE_LOG_TX_BUFFERS
- #define LANCE_LOG_TX_BUFFERS 4
- #define LANCE_LOG_RX_BUFFERS 4
- #endif
-
- #define TX_RING_SIZE (1 << (LANCE_LOG_TX_BUFFERS))
- #define TX_RING_MOD_MASK (TX_RING_SIZE - 1)
- #define TX_RING_LEN_BITS ((LANCE_LOG_TX_BUFFERS) << 29)
-
- #define RX_RING_SIZE (1 << (LANCE_LOG_RX_BUFFERS))
- #define RX_RING_MOD_MASK (RX_RING_SIZE - 1)
- #define RX_RING_LEN_BITS ((LANCE_LOG_RX_BUFFERS) << 29)
-
- #define PKT_BUF_SZ 1544
-
- /* Offsets from base I/O address. */
- #define LANCE_DATA 0x10
- #define LANCE_ADDR 0x12
- #define LANCE_RESET 0x14
- #define LANCE_BUS_IF 0x16
- #define LANCE_TOTAL_SIZE 0x18
-
- /* The LANCE Rx and Tx ring descriptors. */
- struct lance_rx_head {
- int base;
- short buf_length; /* This length is 2s complement (negative)! */
- short msg_length; /* This length is "normal". */
- };
-
- struct lance_tx_head {
- int base;
- short length; /* Length is 2s complement (negative)! */
- short misc;
- };
-
- /* The LANCE initialization block, described in databook. */
- struct lance_init_block {
- unsigned short mode; /* Pre-set mode (reg. 15) */
- unsigned char phys_addr[6]; /* Physical ethernet address */
- unsigned filter[2]; /* Multicast filter (unused). */
- /* Receive and transmit ring base, along with extra bits. */
- unsigned rx_ring; /* Tx and Rx ring base pointers */
- unsigned tx_ring;
- };
-
- struct lance_private {
- char *name;
- void *pad;
- /* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
- struct lance_rx_head rx_ring[RX_RING_SIZE];
- struct lance_tx_head tx_ring[TX_RING_SIZE];
- struct lance_init_block init_block;
- /* The saved address of a sent-in-place packet/buffer, for skfree(). */
- struct sk_buff* tx_skbuff[TX_RING_SIZE];
- long rx_buffs; /* Address of Rx and Tx buffers. */
- /* Tx low-memory "bounce buffer" address. */
- char (*tx_bounce_buffs)[PKT_BUF_SZ];
- int cur_rx, cur_tx; /* The next free ring entry */
- int dirty_rx, dirty_tx; /* The ring entries to be free()ed. */
- int dma;
- struct enet_statistics stats;
- char chip_version; /* See lance_chip_type. */
- char tx_full;
- char lock;
- int pad0, pad1; /* Used for 8-byte alignment */
- };
-
- /* A mapping from the chip ID number to the part number and features.
- These are from the datasheets -- in real life the '970 version
- reportedly has the same ID as the '965. */
- static struct lance_chip_type {
- int id_number;
- char *name;
- int flags;
- } chip_table[] = {
- {0x0000, "LANCE 7990", 0}, /* Ancient lance chip. */
- {0x0003, "PCnet/ISA 79C960", 0}, /* 79C960 PCnet/ISA. */
- {0x2260, "PCnet/ISA+ 79C961", 0}, /* 79C961 PCnet/ISA+, Plug-n-Play. */
- {0x2420, "PCnet/PCI 79C970", 0}, /* 79C970 or 79C974 PCnet-SCSI, PCI. */
- /* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call
- it the PCnet32. */
- {0x2430, "PCnet32", 0}, /* 79C965 PCnet for VL bus. */
- {0x0, "PCnet (unknown)", 0},
- };
-
- enum {OLD_LANCE = 0, PCNET_ISA=1, PCNET_ISAP=2, PCNET_PCI=3, PCNET_VLB=4, LANCE_UNKNOWN=5};
-
- /* Non-zero only if the current card is a PCI with BIOS-set IRQ. */
- static unsigned char pci_irq_line = 0;
-
- static int lance_open(struct device *dev);
- static void lance_init_ring(struct device *dev);
- static int lance_start_xmit(struct sk_buff *skb, struct device *dev);
- static int lance_rx(struct device *dev);
- static void lance_interrupt(int irq, struct pt_regs *regs);
- static int lance_close(struct device *dev);
- static struct enet_statistics *lance_get_stats(struct device *dev);
- #ifdef HAVE_MULTICAST
- static void set_multicast_list(struct device *dev, int num_addrs, void *addrs);
- #endif
-
-
-
- /* This lance probe is unlike the other board probes in 1.0.*. The LANCE may
- have to allocate a contiguous low-memory region for bounce buffers.
- This requirement is satisfied by having the lance initialization occur
- before the memory management system is started, and thus well before the
- other probes. */
-
- unsigned long lance_init(unsigned long mem_start, unsigned long mem_end)
- {
- int *port;
-
- #if defined(CONFIG_PCI)
- #define AMD_VENDOR_ID 0x1022
- #define AMD_DEVICE_ID 0x2000
- if (pcibios_present()) {
- int pci_index;
- printk("lance.c: PCI bios is present, checking for devices...\n");
- for (pci_index = 0; pci_index < 8; pci_index++) {
- unsigned char pci_bus, pci_device_fn;
- unsigned long pci_ioaddr;
- unsigned short pci_command;
-
- if (pcibios_find_device (AMD_VENDOR_ID, AMD_DEVICE_ID, pci_index,
- &pci_bus, &pci_device_fn) != 0)
- break;
- pcibios_read_config_byte(pci_bus, pci_device_fn,
- PCI_INTERRUPT_LINE, &pci_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;
- /* PCI Spec 2.1 states that it is either the driver or PCI card's
- * responsibility to set the PCI Master Enable Bit if needed.
- * (From Mark Stockton <marks@schooner.sys.hou.compaq.com>)
- */
- pcibios_read_config_word(pci_bus, pci_device_fn,
- PCI_COMMAND, &pci_command);
- if ( ! (pci_command & PCI_COMMAND_MASTER)) {
- printk("PCI Master Bit has not been set. Setting...\n");
- pci_command |= PCI_COMMAND_MASTER;
- pcibios_write_config_word(pci_bus, pci_device_fn,
- PCI_COMMAND, pci_command);
- }
- printk("Found PCnet/PCI at %#lx, irq %d (mem_start is %#lx).\n",
- pci_ioaddr, pci_irq_line, mem_start);
- mem_start = lance_probe1(pci_ioaddr, mem_start);
- pci_irq_line = 0;
- }
- }
- #endif /* defined(CONFIG_PCI) */
-
- for (port = lance_portlist; *port; port++) {
- int ioaddr = *port;
-
- if ( check_region(ioaddr, LANCE_TOTAL_SIZE) == 0
- && inb(ioaddr + 14) == 0x57
- && inb(ioaddr + 15) == 0x57) {
- mem_start = lance_probe1(ioaddr, mem_start);
- }
- }
-
- return mem_start;
- }
-
- unsigned long lance_probe1(int ioaddr, unsigned long mem_start)
- {
- struct device *dev;
- struct lance_private *lp;
- short dma_channels; /* Mark spuriously-busy DMA channels */
- int i, reset_val, lance_version;
- char *chipname;
- /* Flags for specific chips or boards. */
- unsigned char hpJ2405A = 0; /* HP ISA adaptor */
- int hp_builtin = 0; /* HP on-board ethernet. */
- static int did_version = 0; /* Already printed version info. */
-
- /* First we look for special cases.
- Check for HP's on-board ethernet by looking for 'HP' in the BIOS.
- There are two HP versions, check the BIOS for the configuration port.
- This method provided by L. Julliard, Laurent_Julliard@grenoble.hp.com.
- */
- if ( *((unsigned short *) 0x000f0102) == 0x5048) {
- short ioaddr_table[] = { 0x300, 0x320, 0x340, 0x360};
- int hp_port = ( *((unsigned char *) 0x000f00f1) & 1) ? 0x499 : 0x99;
- /* We can have boards other than the built-in! Verify this is on-board. */
- if ((inb(hp_port) & 0xc0) == 0x80
- && ioaddr_table[inb(hp_port) & 3] == ioaddr)
- hp_builtin = hp_port;
- }
- /* We also recognize the HP Vectra on-board here, but check below. */
- hpJ2405A = (inb(ioaddr) == 0x08 && inb(ioaddr+1) == 0x00
- && inb(ioaddr+2) == 0x09);
-
- /* Reset the LANCE. */
- reset_val = inw(ioaddr+LANCE_RESET); /* Reset the LANCE */
-
- /* The Un-Reset needed is only needed for the real NE2100, and will
- confuse the HP board. */
- if (!hpJ2405A)
- outw(reset_val, ioaddr+LANCE_RESET);
-
- outw(0x0000, ioaddr+LANCE_ADDR); /* Switch to window 0 */
- if (inw(ioaddr+LANCE_DATA) != 0x0004)
- return mem_start;
-
- /* Get the version of the chip. */
- outw(88, ioaddr+LANCE_ADDR);
- if (inw(ioaddr+LANCE_ADDR) != 88) {
- lance_version = 0;
- } else { /* Good, it's a newer chip. */
- int chip_version = inw(ioaddr+LANCE_DATA);
- outw(89, ioaddr+LANCE_ADDR);
- chip_version |= inw(ioaddr+LANCE_DATA) << 16;
- if (lance_debug > 2)
- printk(" LANCE chip version is %#x.\n", chip_version);
- if ((chip_version & 0xfff) != 0x003)
- return mem_start;
- chip_version = (chip_version >> 12) & 0xffff;
- for (lance_version = 1; chip_table[lance_version].id_number; lance_version++) {
- if (chip_table[lance_version].id_number == chip_version)
- break;
- }
- }
-
- dev = init_etherdev(0, sizeof(struct lance_private)
- + PKT_BUF_SZ*(RX_RING_SIZE + TX_RING_SIZE),
- &mem_start);
-
- chipname = chip_table[lance_version].name;
- 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));
-
- dev->base_addr = ioaddr;
- request_region(ioaddr, LANCE_TOTAL_SIZE, chip_table[lance_version].name);
-
- /* Make certain the data structures used by the LANCE are aligned. */
- dev->priv = (void *)(((int)dev->priv + 7) & ~7);
- lp = (struct lance_private *)dev->priv;
- lp->name = chipname;
- lp->rx_buffs = (long)dev->priv + sizeof(struct lance_private);
- lp->tx_bounce_buffs = (char (*)[PKT_BUF_SZ])
- (lp->rx_buffs + PKT_BUF_SZ*RX_RING_SIZE);
-
- #ifndef final_version
- /* This should never happen. */
- if ((int)(lp->rx_ring) & 0x07) {
- printk(" **ERROR** LANCE Rx and Tx rings not on even boundary.\n");
- return mem_start;
- }
- #endif
-
- lp->chip_version = lance_version;
-
- lp->init_block.mode = 0x0003; /* Disable Rx and Tx. */
- 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 = (int)lp->rx_ring | RX_RING_LEN_BITS;
- lp->init_block.tx_ring = (int)lp->tx_ring | TX_RING_LEN_BITS;
-
- outw(0x0001, ioaddr+LANCE_ADDR);
- inw(ioaddr+LANCE_ADDR);
- outw((short) (int) &lp->init_block, ioaddr+LANCE_DATA);
- outw(0x0002, ioaddr+LANCE_ADDR);
- inw(ioaddr+LANCE_ADDR);
- outw(((int)&lp->init_block) >> 16, ioaddr+LANCE_DATA);
- outw(0x0000, ioaddr+LANCE_ADDR);
- inw(ioaddr+LANCE_ADDR);
-
- if (pci_irq_line) {
- dev->dma = 4; /* Native bus-master, no DMA channel needed. */
- dev->irq = pci_irq_line;
- } else if (hp_builtin) {
- char dma_tbl[4] = {3, 5, 6, 0};
- char irq_tbl[8] = {3, 4, 5, 9};
- unsigned char port_val = inb(hp_builtin);
- dev->dma = dma_tbl[(port_val >> 4) & 3];
- dev->irq = irq_tbl[(port_val >> 2) & 3];
- printk(" HP Vectra IRQ %d DMA %d.\n", dev->irq, dev->dma);
- } else if (hpJ2405A) {
- char dma_tbl[4] = {3, 5, 6, 7};
- char irq_tbl[8] = {3, 4, 5, 9, 10, 11, 12, 15};
- short reset_val = inw(ioaddr+LANCE_RESET);
- dev->dma = dma_tbl[(reset_val >> 2) & 3];
- dev->irq = irq_tbl[(reset_val >> 4) & 7];
- printk(" HP J2405A IRQ %d DMA %d.\n", dev->irq, dev->dma);
- } else if (lance_version == PCNET_ISAP) { /* The plug-n-play version. */
- short bus_info;
- outw(8, ioaddr+LANCE_ADDR);
- bus_info = inw(ioaddr+LANCE_BUS_IF);
- dev->dma = bus_info & 0x07;
- dev->irq = (bus_info >> 4) & 0x0F;
- } else {
- /* The DMA channel may be passed in PARAM1. */
- if (dev->mem_start & 0x07)
- dev->dma = dev->mem_start & 0x07;
- }
-
- if (dev->dma == 0) {
- /* Read the DMA channel status register, so that we can avoid
- stuck DMA channels in the DMA detection below. */
- dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
- (inb(DMA2_STAT_REG) & 0xf0);
- }
- if (dev->irq >= 2)
- printk(" assigned IRQ %d", dev->irq);
- else {
- /* To auto-IRQ we enable the initialization-done and DMA error
- interrupts. For ISA boards we get a DMA error, but VLB and PCI
- boards will work. */
- autoirq_setup(0);
-
- /* Trigger an initialization just for the interrupt. */
- outw(0x0041, ioaddr+LANCE_DATA);
-
- dev->irq = autoirq_report(1);
- if (dev->irq)
- printk(", probed IRQ %d", dev->irq);
- else {
- printk(", failed to detect IRQ line.\n");
- return mem_start;
- }
-
- /* Check for the initialization done bit, 0x0100, which means
- that we don't need a DMA channel. */
- if (inw(ioaddr+LANCE_DATA) & 0x0100)
- dev->dma = 4;
- }
-
- if (dev->dma == 4) {
- printk(", no DMA needed.\n");
- } else if (dev->dma) {
- if (request_dma(dev->dma, chipname)) {
- printk("DMA %d allocation failed.\n", dev->dma);
- return mem_start;
- } else
- printk(", assigned DMA %d.\n", dev->dma);
- } else { /* OK, we have to auto-DMA. */
- int dmas[] = { 5, 6, 7, 3 }, boguscnt;
-
- for (i = 0; i < 4; i++) {
- int dma = dmas[i];
-
- /* Don't enable a permanently busy DMA channel, or the machine
- will hang. */
- if (test_bit(dma, &dma_channels))
- continue;
- outw(0x7f04, ioaddr+LANCE_DATA); /* Clear the memory error bits. */
- if (request_dma(dma, chipname))
- continue;
- set_dma_mode(dma, DMA_MODE_CASCADE);
- enable_dma(dma);
-
- /* Trigger an initialization. */
- outw(0x0001, ioaddr+LANCE_DATA);
- for (boguscnt = 100; boguscnt > 0; --boguscnt)
- if (inw(ioaddr+LANCE_DATA) & 0x0900)
- break;
- if (inw(ioaddr+LANCE_DATA) & 0x0100) {
- dev->dma = dma;
- printk(", DMA %d.\n", dev->dma);
- break;
- } else {
- disable_dma(dma);
- free_dma(dma);
- }
- }
- if (i == 4) { /* Failure: bail. */
- printk("DMA detection failed.\n");
- return mem_start;
- }
- }
-
- if (lp->chip_version != OLD_LANCE) {
- /* Turn on auto-select of media (10baseT or BNC) so that the user
- can watch the LEDs even if the board isn't opened. */
- outw(0x0002, ioaddr+LANCE_ADDR);
- outw(0x0002, ioaddr+LANCE_BUS_IF);
- }
-
- if (lance_debug > 0 && did_version++ == 0)
- printk(version);
-
- /* The LANCE-specific entries in the device structure. */
- dev->open = &lance_open;
- dev->hard_start_xmit = &lance_start_xmit;
- dev->stop = &lance_close;
- dev->get_stats = &lance_get_stats;
- dev->set_multicast_list = &set_multicast_list;
-
- return mem_start;
- }
-
-
- static int
- lance_open(struct device *dev)
- {
- struct lance_private *lp = (struct lance_private *)dev->priv;
- int ioaddr = dev->base_addr;
- int i;
-
- if (dev->irq == 0 ||
- request_irq(dev->irq, &lance_interrupt, 0, lp->name)) {
- return -EAGAIN;
- }
-
- /* We used to allocate DMA here, but that was silly.
- DMA lines can't be shared! We now permanently snarf them. */
-
- irq2dev_map[dev->irq] = dev;
-
- /* Reset the LANCE */
- inw(ioaddr+LANCE_RESET);
-
- /* The DMA controller is used as a no-operation slave, "cascade mode". */
- if (dev->dma != 4) {
- enable_dma(dev->dma);
- set_dma_mode(dev->dma, DMA_MODE_CASCADE);
- }
-
- /* Un-Reset the LANCE, needed only for the NE2100. */
- if (lp->chip_version == OLD_LANCE)
- outw(0, ioaddr+LANCE_RESET);
-
- if (lp->chip_version != OLD_LANCE) {
- /* This is 79C960-specific: Turn on auto-select of media (AUI, BNC). */
- outw(0x0002, ioaddr+LANCE_ADDR);
- outw(0x0002, ioaddr+LANCE_BUS_IF);
- }
-
- if (lance_debug > 1)
- printk("%s: lance_open() irq %d dma %d tx/rx rings %#x/%#x init %#x.\n",
- dev->name, dev->irq, dev->dma, (int) lp->tx_ring, (int) lp->rx_ring,
- (int) &lp->init_block);
-
- lance_init_ring(dev);
- /* Re-initialize the LANCE, and start it when done. */
- outw(0x0001, ioaddr+LANCE_ADDR);
- outw((short) (int) &lp->init_block, ioaddr+LANCE_DATA);
- outw(0x0002, ioaddr+LANCE_ADDR);
- outw(((int)&lp->init_block) >> 16, ioaddr+LANCE_DATA);
-
- outw(0x0004, ioaddr+LANCE_ADDR);
- outw(0x0d15, ioaddr+LANCE_DATA);
-
- outw(0x0000, ioaddr+LANCE_ADDR);
- outw(0x0001, ioaddr+LANCE_DATA);
-
- dev->tbusy = 0;
- dev->interrupt = 0;
- dev->start = 1;
- i = 0;
- while (i++ < 100)
- if (inw(ioaddr+LANCE_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+LANCE_DATA);
-
- if (lance_debug > 2)
- printk("%s: LANCE open after %d ticks, init block %#x csr0 %4.4x.\n",
- dev->name, i, (int) &lp->init_block, inw(ioaddr+LANCE_DATA));
-
- return 0; /* Always succeed */
- }
-
- /* Initialize the LANCE Rx and Tx rings. */
- static void
- lance_init_ring(struct device *dev)
- {
- struct lance_private *lp = (struct lance_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 = (lp->rx_buffs + i*PKT_BUF_SZ) | 0x80000000;
- lp->rx_ring[i].buf_length = -PKT_BUF_SZ;
- }
- /* 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->init_block.mode = 0x0000;
- 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 = (int)lp->rx_ring | RX_RING_LEN_BITS;
- lp->init_block.tx_ring = (int)lp->tx_ring | TX_RING_LEN_BITS;
- }
-
- static int
- lance_start_xmit(struct sk_buff *skb, struct device *dev)
- {
- struct lance_private *lp = (struct lance_private *)dev->priv;
- int ioaddr = dev->base_addr;
- int entry;
-
- /* Transmitter timeout, serious problems. */
- if (dev->tbusy) {
- int tickssofar = jiffies - dev->trans_start;
- if (tickssofar < 20)
- return 1;
- outw(0, ioaddr+LANCE_ADDR);
- printk("%s: transmit timed out, status %4.4x, resetting.\n",
- dev->name, inw(ioaddr+LANCE_DATA));
- outw(0x0004, ioaddr+LANCE_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 %04x", i & 0x3 ? "" : "\n ",
- lp->rx_ring[i].base, -lp->rx_ring[i].buf_length,
- lp->rx_ring[i].msg_length);
- for (i = 0 ; i < TX_RING_SIZE; i++)
- printk("%s %08x %04x %04x", i & 0x3 ? "" : "\n ",
- lp->tx_ring[i].base, -lp->tx_ring[i].length,
- lp->tx_ring[i].misc);
- printk("\n");
- }
- #endif
- lance_init_ring(dev);
- outw(0x0043, ioaddr+LANCE_DATA);
-
- dev->tbusy=0;
- dev->trans_start = jiffies;
-
- return 0;
- }
-
- if (skb == NULL) {
- dev_tint(dev);
- return 0;
- }
-
- if (skb->len <= 0)
- return 0;
-
- if (lance_debug > 3) {
- outw(0x0000, ioaddr+LANCE_ADDR);
- printk("%s: lance_start_xmit() called, csr0 %4.4x.\n", dev->name,
- inw(ioaddr+LANCE_DATA));
- outw(0x0000, ioaddr+LANCE_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 (set_bit(0, (void*)&dev->tbusy) != 0) {
- printk("%s: Transmitter access conflict.\n", dev->name);
- return 1;
- }
-
- if (set_bit(0, (void*)&lp->lock) != 0) {
- if (lance_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. */
-
- /* The old LANCE chips doesn't automatically pad buffers to min. size. */
- if (lp->chip_version == OLD_LANCE) {
- lp->tx_ring[entry].length =
- -(ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN);
- } else
- lp->tx_ring[entry].length = -skb->len;
-
- lp->tx_ring[entry].misc = 0x0000;
-
- /* If any part of this buffer is >16M we must copy it to a low-memory
- buffer. */
- if ((int)(skb->data) + skb->len > 0x01000000) {
- if (lance_debug > 5)
- printk("%s: bouncing a high-memory packet (%#x).\n",
- dev->name, (int)(skb->data));
- memcpy(&lp->tx_bounce_buffs[entry], skb->data, skb->len);
- lp->tx_ring[entry].base =
- (int)(lp->tx_bounce_buffs + entry) | 0x83000000;
- dev_kfree_skb (skb, FREE_WRITE);
- } else {
- lp->tx_skbuff[entry] = skb;
- lp->tx_ring[entry].base = (int)(skb->data) | 0x83000000;
- }
- lp->cur_tx++;
-
- /* Trigger an immediate send poll. */
- outw(0x0000, ioaddr+LANCE_ADDR);
- outw(0x0048, ioaddr+LANCE_DATA);
-
- dev->trans_start = jiffies;
-
- cli();
- lp->lock = 0;
- if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0)
- dev->tbusy=0;
- else
- lp->tx_full = 1;
- sti();
-
- return 0;
- }
-
- /* The LANCE interrupt handler. */
- static void
- lance_interrupt(int irq, struct pt_regs * regs)
- {
- struct device *dev = (struct device *)(irq2dev_map[irq]);
- struct lance_private *lp;
- int csr0, ioaddr, boguscnt=10;
-
- if (dev == NULL) {
- printk ("lance_interrupt(): irq %d for unknown device.\n", irq);
- return;
- }
-
- ioaddr = dev->base_addr;
- lp = (struct lance_private *)dev->priv;
- if (dev->interrupt)
- printk("%s: Re-entering the interrupt handler.\n", dev->name);
-
- dev->interrupt = 1;
-
- outw(0x00, dev->base_addr + LANCE_ADDR);
- while ((csr0 = inw(dev->base_addr + LANCE_DATA)) & 0x8600
- && --boguscnt >= 0) {
- /* Acknowledge all of the current interrupt sources ASAP. */
- outw(csr0 & ~0x004f, dev->base_addr + LANCE_DATA);
-
- if (lance_debug > 5)
- printk("%s: interrupt csr0=%#2.2x new csr=%#2.2x.\n",
- dev->name, csr0, inw(dev->base_addr + LANCE_DATA));
-
- if (csr0 & 0x0400) /* Rx interrupt */
- lance_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 = lp->tx_ring[entry].base;
-
- if (status < 0)
- break; /* It still hasn't been Txed */
-
- lp->tx_ring[entry].base = 0;
-
- if (status & 0x40000000) {
- /* There was an major error, log it. */
- int err_status = lp->tx_ring[entry].misc;
- lp->stats.tx_errors++;
- if (err_status & 0x0400) lp->stats.tx_aborted_errors++;
- if (err_status & 0x0800) lp->stats.tx_carrier_errors++;
- if (err_status & 0x1000) lp->stats.tx_window_errors++;
- if (err_status & 0x4000) {
- /* 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. */
- outw(0x0002, dev->base_addr + LANCE_DATA);
- }
- } else {
- if (status & 0x18000000)
- lp->stats.collisions++;
- lp->stats.tx_packets++;
- }
-
- /* We must free the original skb if it's not a data-only copy
- in the bounce buffer. */
- 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;
- dev->tbusy = 0;
- mark_bh(NET_BH);
- }
-
- lp->dirty_tx = dirty_tx;
- }
-
- /* Log misc errors. */
- if (csr0 & 0x4000) lp->stats.tx_errors++; /* Tx babble. */
- if (csr0 & 0x1000) 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. */
- outw(0x0002, dev->base_addr + LANCE_DATA);
- }
- }
-
- /* Clear any other interrupt, and set interrupt enable. */
- outw(0x0000, dev->base_addr + LANCE_ADDR);
- outw(0x7940, dev->base_addr + LANCE_DATA);
-
- if (lance_debug > 4)
- printk("%s: exiting interrupt, csr%d=%#4.4x.\n",
- dev->name, inw(ioaddr + LANCE_ADDR),
- inw(dev->base_addr + LANCE_DATA));
-
- dev->interrupt = 0;
- return;
- }
-
- static int
- lance_rx(struct device *dev)
- {
- struct lance_private *lp = (struct lance_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 (lp->rx_ring[entry].base >= 0) {
- int status = lp->rx_ring[entry].base >> 24;
-
- 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].base &= 0x03ffffff;
- } else {
- /* Malloc up new buffer, compatible with net-2e. */
- short pkt_len = lp->rx_ring[entry].msg_length;
- struct sk_buff *skb;
-
- skb = alloc_skb(pkt_len, GFP_ATOMIC);
- if (skb == NULL) {
- printk("%s: Memory squeeze, deferring packet.\n", dev->name);
- for (i=0; i < RX_RING_SIZE; i++)
- if (lp->rx_ring[(entry+i) & RX_RING_MOD_MASK].base < 0)
- break;
-
- if (i > RX_RING_SIZE -2) {
- lp->stats.rx_dropped++;
- lp->rx_ring[entry].base |= 0x80000000;
- lp->cur_rx++;
- }
- break;
- }
- skb->len = pkt_len;
- skb->dev = dev;
- memcpy(skb->data,
- (unsigned char *)(lp->rx_ring[entry].base & 0x00ffffff),
- pkt_len);
- 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 = -PKT_BUF_SZ;
- lp->rx_ring[entry].base |= 0x80000000;
- 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
- lance_close(struct device *dev)
- {
- int ioaddr = dev->base_addr;
- struct lance_private *lp = (struct lance_private *)dev->priv;
-
- dev->start = 0;
- dev->tbusy = 1;
-
- if (lp->chip_version != OLD_LANCE) {
- outw(112, ioaddr+LANCE_ADDR);
- lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
- }
- outw(0, ioaddr+LANCE_ADDR);
-
- if (lance_debug > 1)
- printk("%s: Shutting down ethercard, status was %2.2x.\n",
- dev->name, inw(ioaddr+LANCE_DATA));
-
- /* We stop the LANCE here -- it occasionally polls
- memory if we don't. */
- outw(0x0004, ioaddr+LANCE_DATA);
-
- if (dev->dma != 4)
- disable_dma(dev->dma);
-
- free_irq(dev->irq);
-
- irq2dev_map[dev->irq] = 0;
-
- return 0;
- }
-
- static struct enet_statistics *
- lance_get_stats(struct device *dev)
- {
- struct lance_private *lp = (struct lance_private *)dev->priv;
- short ioaddr = dev->base_addr;
- short saved_addr;
-
- if (lp->chip_version != OLD_LANCE) {
- cli();
- saved_addr = inw(ioaddr+LANCE_ADDR);
- outw(112, ioaddr+LANCE_ADDR);
- lp->stats.rx_missed_errors = inw(ioaddr+LANCE_DATA);
- outw(saved_addr, ioaddr+LANCE_ADDR);
- sti();
- }
-
- return &lp->stats;
- }
-
- /* Set or clear the multicast filter for this adaptor.
- num_addrs == -1 Promiscuous mode, receive all packets
- num_addrs == 0 Normal mode, clear multicast list
- num_addrs > 0 Multicast mode, receive normal and MC packets, and do
- best-effort filtering.
- */
- static void
- set_multicast_list(struct device *dev, int num_addrs, void *addrs)
- {
- short ioaddr = dev->base_addr;
-
- /* We take the simple way out and always enable promiscuous mode. */
- outw(0, ioaddr+LANCE_ADDR);
- outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance. */
-
- outw(15, ioaddr+LANCE_ADDR);
- if (num_addrs >= 0) {
- short multicast_table[4];
- int i;
- /* We don't use the multicast table, but rely on upper-layer filtering. */
- memset(multicast_table, (num_addrs == 0) ? 0 : -1, sizeof(multicast_table));
- for (i = 0; i < 4; i++) {
- outw(8 + i, ioaddr+LANCE_ADDR);
- outw(multicast_table[i], ioaddr+LANCE_DATA);
- }
- outw(0x0000, ioaddr+LANCE_DATA); /* Unset promiscuous mode */
- } else {
- /* Log any net taps. */
- printk("%s: Promiscuous mode enabled.\n", dev->name);
- outw(0x8000, ioaddr+LANCE_DATA); /* Set promiscuous mode */
- }
-
- outw(0, ioaddr+LANCE_ADDR);
- outw(0x0142, ioaddr+LANCE_DATA); /* Resume normal operation. */
- }
-
-
- /*
- * Local variables:
- * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c lance.c"
- * c-indent-level: 4
- * tab-width: 4
- * End:
- */
-