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author | Thomas Bushnell <thomas@gnu.org> | 1997-02-25 21:28:37 +0000 |
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committer | Thomas Bushnell <thomas@gnu.org> | 1997-02-25 21:28:37 +0000 |
commit | f07a4c844da9f0ecae5bbee1ab94be56505f26f7 (patch) | |
tree | 12b07c7e578fc1a5f53dbfde2632408491ff2a70 /i386/i386at/gpl/linux/net/lance.c | |
download | gnumach-f07a4c844da9f0ecae5bbee1ab94be56505f26f7.tar.gz gnumach-f07a4c844da9f0ecae5bbee1ab94be56505f26f7.tar.bz2 gnumach-f07a4c844da9f0ecae5bbee1ab94be56505f26f7.zip |
Initial source
Diffstat (limited to 'i386/i386at/gpl/linux/net/lance.c')
-rw-r--r-- | i386/i386at/gpl/linux/net/lance.c | 1129 |
1 files changed, 1129 insertions, 0 deletions
diff --git a/i386/i386at/gpl/linux/net/lance.c b/i386/i386at/gpl/linux/net/lance.c new file mode 100644 index 00000000..4a388f77 --- /dev/null +++ b/i386/i386at/gpl/linux/net/lance.c @@ -0,0 +1,1129 @@ +/* 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: + */ |