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Diffstat (limited to 'i386/i386at/gpl/linux/net/lance.c')
| -rw-r--r-- | i386/i386at/gpl/linux/net/lance.c | 1129 |
1 files changed, 0 insertions, 1129 deletions
diff --git a/i386/i386at/gpl/linux/net/lance.c b/i386/i386at/gpl/linux/net/lance.c deleted file mode 100644 index 4a388f77..00000000 --- a/i386/i386at/gpl/linux/net/lance.c +++ /dev/null @@ -1,1129 +0,0 @@ -/* 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 const char *version = "lance.c:v1.08 4/10/95 dplatt@3do.com\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> - -static unsigned int lance_portlist[] = {0x300, 0x320, 0x340, 0x360, 0}; -void lance_probe1(int ioaddr); - -#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 { - /* The Tx and Rx ring entries must be aligned on 8-byte boundaries. - This is always true for kmalloc'ed memory */ - struct lance_rx_head rx_ring[RX_RING_SIZE]; - struct lance_tx_head tx_ring[TX_RING_SIZE]; - struct lance_init_block init_block; - const char *name; - /* 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; - unsigned char chip_version; /* See lance_chip_type. */ - char tx_full; - char lock; -}; - -#define LANCE_MUST_PAD 0x00000001 -#define LANCE_ENABLE_AUTOSELECT 0x00000002 -#define LANCE_MUST_REINIT_RING 0x00000004 -#define LANCE_MUST_UNRESET 0x00000008 -#define LANCE_HAS_MISSED_FRAME 0x00000010 - -/* 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; - const char *name; - int flags; -} chip_table[] = { - {0x0000, "LANCE 7990", /* Ancient lance chip. */ - LANCE_MUST_PAD + LANCE_MUST_UNRESET}, - {0x0003, "PCnet/ISA 79C960", /* 79C960 PCnet/ISA. */ - LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + - LANCE_HAS_MISSED_FRAME}, - {0x2260, "PCnet/ISA+ 79C961", /* 79C961 PCnet/ISA+, Plug-n-Play. */ - LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + - LANCE_HAS_MISSED_FRAME}, - {0x2420, "PCnet/PCI 79C970", /* 79C970 or 79C974 PCnet-SCSI, PCI. */ - LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + - LANCE_HAS_MISSED_FRAME}, - /* Bug: the PCnet/PCI actually uses the PCnet/VLB ID number, so just call - it the PCnet32. */ - {0x2430, "PCnet32", /* 79C965 PCnet for VL bus. */ - LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + - LANCE_HAS_MISSED_FRAME}, - {0x0, "PCnet (unknown)", - LANCE_ENABLE_AUTOSELECT + LANCE_MUST_REINIT_RING + - LANCE_HAS_MISSED_FRAME}, -}; - -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; - -/* Non-zero if lance_probe1() needs to allocate low-memory bounce buffers. - Assume yes until we know the memory size. */ -static unsigned char lance_need_isa_bounce_buffers = 1; - -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); -static void set_multicast_list(struct device *dev); - - - -/* 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. */ - -int lance_init(void) -{ - int *port; - - if (high_memory <= 16*1024*1024) - lance_need_isa_bounce_buffers = 0; - -#if defined(CONFIG_PCI) - 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 int pci_ioaddr; - unsigned short pci_command; - - if (pcibios_find_device (PCI_VENDOR_ID_AMD, - PCI_DEVICE_ID_AMD_LANCE, 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 %#x, irq %d.\n", - pci_ioaddr, pci_irq_line); - lance_probe1(pci_ioaddr); - 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) { - /* Detect "normal" 0x57 0x57 and the NI6510EB 0x52 0x44 - signatures w/ minimal I/O reads */ - char offset15, offset14 = inb(ioaddr + 14); - - if ((offset14 == 0x52 || offset14 == 0x57) && - ((offset15 = inb(ioaddr + 15)) == 0x57 || offset15 == 0x44)) - lance_probe1(ioaddr); - } - } - - return 0; -} - -void lance_probe1(int ioaddr) -{ - struct device *dev; - struct lance_private *lp; - short dma_channels; /* Mark spuriously-busy DMA channels */ - int i, reset_val, lance_version; - const 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) { - static const 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; - - /* 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; - 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, 0); - 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 and DMAble. */ - lp = (struct lance_private *) kmalloc(sizeof(*lp), GFP_DMA | GFP_KERNEL); - memset(lp, 0, sizeof(*lp)); - dev->priv = lp; - lp->name = chipname; - lp->rx_buffs = (unsigned long) kmalloc(PKT_BUF_SZ*RX_RING_SIZE, GFP_DMA | GFP_KERNEL); - lp->tx_bounce_buffs = NULL; - if (lance_need_isa_bounce_buffers) - lp->tx_bounce_buffs = kmalloc(PKT_BUF_SZ*TX_RING_SIZE, GFP_DMA | GFP_KERNEL); - - 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) { - static const char dma_tbl[4] = {3, 5, 6, 0}; - static const char irq_tbl[4] = {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) { - static const char dma_tbl[4] = {3, 5, 6, 7}; - static const 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; - } - - /* 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; - } else - printk(", assigned DMA %d.\n", dev->dma); - } else { /* OK, we have to auto-DMA. */ - for (i = 0; i < 4; i++) { - static const char dmas[] = { 5, 6, 7, 3 }; - int dma = dmas[i]; - int boguscnt; - - /* 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; - } - } - - if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) { - /* 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; -} - - -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 allocate 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 (chip_table[lp->chip_version].flags & LANCE_MUST_UNRESET) - outw(0, ioaddr+LANCE_RESET); - - if (chip_table[lp->chip_version].flags & LANCE_ENABLE_AUTOSELECT) { - /* 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(0x0915, 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 */ -} - -/* 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 -lance_purge_tx_ring(struct device *dev) -{ - struct lance_private *lp = (struct lance_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 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 void -lance_restart(struct device *dev, unsigned int csr0_bits, int must_reinit) -{ - struct lance_private *lp = (struct lance_private *)dev->priv; - - if (must_reinit || - (chip_table[lp->chip_version].flags & LANCE_MUST_REINIT_RING)) { - lance_purge_tx_ring(dev); - lance_init_ring(dev); - } - outw(0x0000, dev->base_addr + LANCE_ADDR); - outw(csr0_bits, dev->base_addr + LANCE_DATA); -} - -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; - unsigned long flags; - - /* 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_restart(dev, 0x0043, 1); - - 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 (chip_table[lp->chip_version].flags & LANCE_MUST_PAD) { - 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; - - save_flags(flags); - cli(); - lp->lock = 0; - if (lp->tx_ring[(entry+1) & TX_RING_MOD_MASK].base == 0) - dev->tbusy=0; - else - lp->tx_full = 1; - restore_flags(flags); - - 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; - int must_restart; - - 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); - - must_restart = 0; - - 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. */ - must_restart = 1; - } - } 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. */ - must_restart = 1; - } - - if (must_restart) { - /* stop the chip to clear the error condition, then restart */ - outw(0x0000, dev->base_addr + LANCE_ADDR); - outw(0x0004, dev->base_addr + LANCE_DATA); - lance_restart(dev, 0x0002, 0); - } - } - - /* 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 & 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 (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->dev = dev; - skb_reserve(skb,2); /* 16 byte align */ - skb_put(skb,pkt_len); /* Make room */ - eth_copy_and_sum(skb, - (unsigned char *)(lp->rx_ring[entry].base & 0x00ffffff), - 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 = -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 (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) { - 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; - unsigned long flags; - - if (chip_table[lp->chip_version].flags & LANCE_HAS_MISSED_FRAME) { - save_flags(flags); - 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); - restore_flags(flags); - } - - return &lp->stats; -} - -/* Set or clear the multicast filter for this adaptor. - */ - -static void set_multicast_list(struct device *dev) -{ - short ioaddr = dev->base_addr; - - outw(0, ioaddr+LANCE_ADDR); - outw(0x0004, ioaddr+LANCE_DATA); /* Temporarily stop the lance. */ - - if (dev->flags&IFF_PROMISC) { - /* Log any net taps. */ - printk("%s: Promiscuous mode enabled.\n", dev->name); - outw(15, ioaddr+LANCE_ADDR); - outw(0x8000, ioaddr+LANCE_DATA); /* Set promiscuous mode */ - } else { - short multicast_table[4]; - int i; - 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(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(15, ioaddr+LANCE_ADDR); - outw(0x0000, ioaddr+LANCE_DATA); /* Unset promiscuous mode */ - } - - lance_restart(dev, 0x0142, 0); /* 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: - */ |