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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/ariadne.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/net/ariadne.c')
-rw-r--r-- | drivers/net/ariadne.c | 878 |
1 files changed, 878 insertions, 0 deletions
diff --git a/drivers/net/ariadne.c b/drivers/net/ariadne.c new file mode 100644 index 0000000..9fe93ac --- /dev/null +++ b/drivers/net/ariadne.c @@ -0,0 +1,878 @@ +/* + * Amiga Linux/m68k Ariadne Ethernet Driver + * + * © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org) + * Peter De Schrijver (p2@mind.be) + * + * --------------------------------------------------------------------------- + * + * This program is based on + * + * lance.c: An AMD LANCE ethernet driver for linux. + * Written 1993-94 by Donald Becker. + * + * Am79C960: PCnet(tm)-ISA Single-Chip Ethernet Controller + * Advanced Micro Devices + * Publication #16907, Rev. B, Amendment/0, May 1994 + * + * MC68230: Parallel Interface/Timer (PI/T) + * Motorola Semiconductors, December, 1983 + * + * --------------------------------------------------------------------------- + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of the Linux + * distribution for more details. + * + * --------------------------------------------------------------------------- + * + * The Ariadne is a Zorro-II board made by Village Tronic. It contains: + * + * - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both + * 10BASE-2 (thin coax) and 10BASE-T (UTP) connectors + * + * - an MC68230 Parallel Interface/Timer configured as 2 parallel ports + */ + +#include <linux/module.h> +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/interrupt.h> +#include <linux/skbuff.h> +#include <linux/init.h> +#include <linux/zorro.h> +#include <linux/bitops.h> + +#include <asm/amigaints.h> +#include <asm/amigahw.h> +#include <asm/irq.h> + +#include "ariadne.h" + + +#ifdef ARIADNE_DEBUG +int ariadne_debug = ARIADNE_DEBUG; +#else +int ariadne_debug = 1; +#endif + + + /* + * Macros to Fix Endianness problems + */ + + /* Swap the Bytes in a WORD */ +#define swapw(x) (((x>>8)&0x00ff)|((x<<8)&0xff00)) + /* Get the Low BYTE in a WORD */ +#define lowb(x) (x&0xff) + /* Get the Swapped High WORD in a LONG */ +#define swhighw(x) ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff)) + /* Get the Swapped Low WORD in a LONG */ +#define swloww(x) ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff)) + + + /* + * Transmit/Receive Ring Definitions + */ + +#define TX_RING_SIZE 5 +#define RX_RING_SIZE 16 + +#define PKT_BUF_SIZE 1520 + + + /* + * Private Device Data + */ + +struct ariadne_private { + volatile struct TDRE *tx_ring[TX_RING_SIZE]; + volatile struct RDRE *rx_ring[RX_RING_SIZE]; + volatile u_short *tx_buff[TX_RING_SIZE]; + volatile u_short *rx_buff[RX_RING_SIZE]; + int cur_tx, cur_rx; /* The next free ring entry */ + int dirty_tx; /* The ring entries to be free()ed. */ + struct net_device_stats stats; + char tx_full; +}; + + + /* + * Structure Created in the Ariadne's RAM Buffer + */ + +struct lancedata { + struct TDRE tx_ring[TX_RING_SIZE]; + struct RDRE rx_ring[RX_RING_SIZE]; + u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)]; + u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)]; +}; + +static int ariadne_open(struct net_device *dev); +static void ariadne_init_ring(struct net_device *dev); +static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev); +static void ariadne_tx_timeout(struct net_device *dev); +static int ariadne_rx(struct net_device *dev); +static void ariadne_reset(struct net_device *dev); +static irqreturn_t ariadne_interrupt(int irq, void *data, struct pt_regs *fp); +static int ariadne_close(struct net_device *dev); +static struct net_device_stats *ariadne_get_stats(struct net_device *dev); +#ifdef HAVE_MULTICAST +static void set_multicast_list(struct net_device *dev); +#endif + + +static void memcpyw(volatile u_short *dest, u_short *src, int len) +{ + while (len >= 2) { + *(dest++) = *(src++); + len -= 2; + } + if (len == 1) + *dest = (*(u_char *)src)<<8; +} + + +static int __devinit ariadne_init_one(struct zorro_dev *z, + const struct zorro_device_id *ent); +static void __devexit ariadne_remove_one(struct zorro_dev *z); + + +static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = { + { ZORRO_PROD_VILLAGE_TRONIC_ARIADNE }, + { 0 } +}; + +static struct zorro_driver ariadne_driver = { + .name = "ariadne", + .id_table = ariadne_zorro_tbl, + .probe = ariadne_init_one, + .remove = __devexit_p(ariadne_remove_one), +}; + +static int __devinit ariadne_init_one(struct zorro_dev *z, + const struct zorro_device_id *ent) +{ + unsigned long board = z->resource.start; + unsigned long base_addr = board+ARIADNE_LANCE; + unsigned long mem_start = board+ARIADNE_RAM; + struct resource *r1, *r2; + struct net_device *dev; + struct ariadne_private *priv; + int err; + + r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960"); + if (!r1) + return -EBUSY; + r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM"); + if (!r2) { + release_resource(r1); + return -EBUSY; + } + + dev = alloc_etherdev(sizeof(struct ariadne_private)); + if (dev == NULL) { + release_resource(r1); + release_resource(r2); + return -ENOMEM; + } + + SET_MODULE_OWNER(dev); + priv = netdev_priv(dev); + + r1->name = dev->name; + r2->name = dev->name; + + dev->dev_addr[0] = 0x00; + dev->dev_addr[1] = 0x60; + dev->dev_addr[2] = 0x30; + dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff; + dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff; + dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff; + dev->base_addr = ZTWO_VADDR(base_addr); + dev->mem_start = ZTWO_VADDR(mem_start); + dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE; + + dev->open = &ariadne_open; + dev->stop = &ariadne_close; + dev->hard_start_xmit = &ariadne_start_xmit; + dev->tx_timeout = &ariadne_tx_timeout; + dev->watchdog_timeo = 5*HZ; + dev->get_stats = &ariadne_get_stats; + dev->set_multicast_list = &set_multicast_list; + + err = register_netdev(dev); + if (err) { + release_resource(r1); + release_resource(r2); + free_netdev(dev); + return err; + } + zorro_set_drvdata(z, dev); + + printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address " + "%02x:%02x:%02x:%02x:%02x:%02x\n", dev->name, board, + dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2], + dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]); + + return 0; +} + + +static int ariadne_open(struct net_device *dev) +{ + volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr; + u_short in; + u_long version; + int i; + + /* Reset the LANCE */ + in = lance->Reset; + + /* Stop the LANCE */ + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + lance->RDP = STOP; + + /* Check the LANCE version */ + lance->RAP = CSR88; /* Chip ID */ + version = swapw(lance->RDP); + lance->RAP = CSR89; /* Chip ID */ + version |= swapw(lance->RDP)<<16; + if ((version & 0x00000fff) != 0x00000003) { + printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n"); + return -EAGAIN; + } + if ((version & 0x0ffff000) != 0x00003000) { + printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part " + "number = %ld)\n", (version & 0x0ffff000)>>12); + return -EAGAIN; + } +#if 0 + printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n", + (version & 0xf0000000)>>28); +#endif + + ariadne_init_ring(dev); + + /* Miscellaneous Stuff */ + lance->RAP = CSR3; /* Interrupt Masks and Deferral Control */ + lance->RDP = 0x0000; + lance->RAP = CSR4; /* Test and Features Control */ + lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM; + + /* Set the Multicast Table */ + lance->RAP = CSR8; /* Logical Address Filter, LADRF[15:0] */ + lance->RDP = 0x0000; + lance->RAP = CSR9; /* Logical Address Filter, LADRF[31:16] */ + lance->RDP = 0x0000; + lance->RAP = CSR10; /* Logical Address Filter, LADRF[47:32] */ + lance->RDP = 0x0000; + lance->RAP = CSR11; /* Logical Address Filter, LADRF[63:48] */ + lance->RDP = 0x0000; + + /* Set the Ethernet Hardware Address */ + lance->RAP = CSR12; /* Physical Address Register, PADR[15:0] */ + lance->RDP = ((u_short *)&dev->dev_addr[0])[0]; + lance->RAP = CSR13; /* Physical Address Register, PADR[31:16] */ + lance->RDP = ((u_short *)&dev->dev_addr[0])[1]; + lance->RAP = CSR14; /* Physical Address Register, PADR[47:32] */ + lance->RDP = ((u_short *)&dev->dev_addr[0])[2]; + + /* Set the Init Block Mode */ + lance->RAP = CSR15; /* Mode Register */ + lance->RDP = 0x0000; + + /* Set the Transmit Descriptor Ring Pointer */ + lance->RAP = CSR30; /* Base Address of Transmit Ring */ + lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring)); + lance->RAP = CSR31; /* Base Address of transmit Ring */ + lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring)); + + /* Set the Receive Descriptor Ring Pointer */ + lance->RAP = CSR24; /* Base Address of Receive Ring */ + lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring)); + lance->RAP = CSR25; /* Base Address of Receive Ring */ + lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring)); + + /* Set the Number of RX and TX Ring Entries */ + lance->RAP = CSR76; /* Receive Ring Length */ + lance->RDP = swapw(((u_short)-RX_RING_SIZE)); + lance->RAP = CSR78; /* Transmit Ring Length */ + lance->RDP = swapw(((u_short)-TX_RING_SIZE)); + + /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */ + lance->RAP = ISACSR2; /* Miscellaneous Configuration */ + lance->IDP = ASEL; + + /* LED Control */ + lance->RAP = ISACSR5; /* LED1 Status */ + lance->IDP = PSE|XMTE; + lance->RAP = ISACSR6; /* LED2 Status */ + lance->IDP = PSE|COLE; + lance->RAP = ISACSR7; /* LED3 Status */ + lance->IDP = PSE|RCVE; + + netif_start_queue(dev); + + i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, SA_SHIRQ, + dev->name, dev); + if (i) return i; + + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + lance->RDP = INEA|STRT; + + return 0; +} + + +static void ariadne_init_ring(struct net_device *dev) +{ + struct ariadne_private *priv = netdev_priv(dev); + volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start; + int i; + + netif_stop_queue(dev); + + priv->tx_full = 0; + priv->cur_rx = priv->cur_tx = 0; + priv->dirty_tx = 0; + + /* Set up TX Ring */ + for (i = 0; i < TX_RING_SIZE; i++) { + volatile struct TDRE *t = &lancedata->tx_ring[i]; + t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])); + t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) | + TF_STP | TF_ENP; + t->TMD2 = swapw((u_short)-PKT_BUF_SIZE); + t->TMD3 = 0; + priv->tx_ring[i] = &lancedata->tx_ring[i]; + priv->tx_buff[i] = lancedata->tx_buff[i]; +#if 0 + printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i, + &lancedata->tx_ring[i], lancedata->tx_buff[i]); +#endif + } + + /* Set up RX Ring */ + for (i = 0; i < RX_RING_SIZE; i++) { + volatile struct RDRE *r = &lancedata->rx_ring[i]; + r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])); + r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) | + RF_OWN; + r->RMD2 = swapw((u_short)-PKT_BUF_SIZE); + r->RMD3 = 0x0000; + priv->rx_ring[i] = &lancedata->rx_ring[i]; + priv->rx_buff[i] = lancedata->rx_buff[i]; +#if 0 + printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i, + &lancedata->rx_ring[i], lancedata->rx_buff[i]); +#endif + } +} + + +static int ariadne_close(struct net_device *dev) +{ + struct ariadne_private *priv = netdev_priv(dev); + volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr; + + netif_stop_queue(dev); + + lance->RAP = CSR112; /* Missed Frame Count */ + priv->stats.rx_missed_errors = swapw(lance->RDP); + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + + if (ariadne_debug > 1) { + printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n", + dev->name, lance->RDP); + printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name, + priv->stats.rx_missed_errors); + } + + /* We stop the LANCE here -- it occasionally polls memory if we don't. */ + lance->RDP = STOP; + + free_irq(IRQ_AMIGA_PORTS, dev); + + return 0; +} + + +static inline void ariadne_reset(struct net_device *dev) +{ + volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr; + + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + lance->RDP = STOP; + ariadne_init_ring(dev); + lance->RDP = INEA|STRT; + netif_start_queue(dev); +} + + +static irqreturn_t ariadne_interrupt(int irq, void *data, struct pt_regs *fp) +{ + struct net_device *dev = (struct net_device *)data; + volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr; + struct ariadne_private *priv; + int csr0, boguscnt; + int handled = 0; + + if (dev == NULL) { + printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n"); + return IRQ_NONE; + } + + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + + if (!(lance->RDP & INTR)) /* Check if any interrupt has been */ + return IRQ_NONE; /* generated by the board. */ + + priv = netdev_priv(dev); + + boguscnt = 10; + while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) { + /* Acknowledge all of the current interrupt sources ASAP. */ + lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT); + +#if 0 + if (ariadne_debug > 5) { + printk(KERN_DEBUG "%s: interrupt csr0=%#2.2x new csr=%#2.2x.", + dev->name, csr0, lance->RDP); + printk("["); + if (csr0 & INTR) + printk(" INTR"); + if (csr0 & INEA) + printk(" INEA"); + if (csr0 & RXON) + printk(" RXON"); + if (csr0 & TXON) + printk(" TXON"); + if (csr0 & TDMD) + printk(" TDMD"); + if (csr0 & STOP) + printk(" STOP"); + if (csr0 & STRT) + printk(" STRT"); + if (csr0 & INIT) + printk(" INIT"); + if (csr0 & ERR) + printk(" ERR"); + if (csr0 & BABL) + printk(" BABL"); + if (csr0 & CERR) + printk(" CERR"); + if (csr0 & MISS) + printk(" MISS"); + if (csr0 & MERR) + printk(" MERR"); + if (csr0 & RINT) + printk(" RINT"); + if (csr0 & TINT) + printk(" TINT"); + if (csr0 & IDON) + printk(" IDON"); + printk(" ]\n"); + } +#endif + + if (csr0 & RINT) { /* Rx interrupt */ + handled = 1; + ariadne_rx(dev); + } + + if (csr0 & TINT) { /* Tx-done interrupt */ + int dirty_tx = priv->dirty_tx; + + handled = 1; + while (dirty_tx < priv->cur_tx) { + int entry = dirty_tx % TX_RING_SIZE; + int status = lowb(priv->tx_ring[entry]->TMD1); + + if (status & TF_OWN) + break; /* It still hasn't been Txed */ + + priv->tx_ring[entry]->TMD1 &= 0xff00; + + if (status & TF_ERR) { + /* There was an major error, log it. */ + int err_status = priv->tx_ring[entry]->TMD3; + priv->stats.tx_errors++; + if (err_status & EF_RTRY) + priv->stats.tx_aborted_errors++; + if (err_status & EF_LCAR) + priv->stats.tx_carrier_errors++; + if (err_status & EF_LCOL) + priv->stats.tx_window_errors++; + if (err_status & EF_UFLO) { + /* Ackk! On FIFO errors the Tx unit is turned off! */ + priv->stats.tx_fifo_errors++; + /* Remove this verbosity later! */ + printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n", + dev->name, csr0); + /* Restart the chip. */ + lance->RDP = STRT; + } + } else { + if (status & (TF_MORE|TF_ONE)) + priv->stats.collisions++; + priv->stats.tx_packets++; + } + dirty_tx++; + } + +#ifndef final_version + if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) { + printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, " + "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full); + dirty_tx += TX_RING_SIZE; + } +#endif + + if (priv->tx_full && netif_queue_stopped(dev) && + dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) { + /* The ring is no longer full. */ + priv->tx_full = 0; + netif_wake_queue(dev); + } + + priv->dirty_tx = dirty_tx; + } + + /* Log misc errors. */ + if (csr0 & BABL) { + handled = 1; + priv->stats.tx_errors++; /* Tx babble. */ + } + if (csr0 & MISS) { + handled = 1; + priv->stats.rx_errors++; /* Missed a Rx frame. */ + } + if (csr0 & MERR) { + handled = 1; + printk(KERN_ERR "%s: Bus master arbitration failure, status " + "%4.4x.\n", dev->name, csr0); + /* Restart the chip. */ + lance->RDP = STRT; + } + } + + /* Clear any other interrupt, and set interrupt enable. */ + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON; + +#if 0 + if (ariadne_debug > 4) + printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name, + lance->RAP, lance->RDP); +#endif + return IRQ_RETVAL(handled); +} + + +static void ariadne_tx_timeout(struct net_device *dev) +{ + volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr; + + printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n", + dev->name, lance->RDP); + ariadne_reset(dev); + netif_wake_queue(dev); +} + + +static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ariadne_private *priv = netdev_priv(dev); + volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr; + int entry; + unsigned long flags; + int len = skb->len; + +#if 0 + if (ariadne_debug > 3) { + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n", + dev->name, lance->RDP); + lance->RDP = 0x0000; + } +#endif + + /* FIXME: is the 79C960 new enough to do its own padding right ? */ + if (skb->len < ETH_ZLEN) + { + skb = skb_padto(skb, ETH_ZLEN); + if (skb == NULL) + return 0; + len = ETH_ZLEN; + } + + /* Fill in a Tx ring entry */ + +#if 0 + printk(KERN_DEBUG "TX pkt type 0x%04x from ", ((u_short *)skb->data)[6]); + { + int i; + u_char *ptr = &((u_char *)skb->data)[6]; + for (i = 0; i < 6; i++) + printk("%02x", ptr[i]); + } + printk(" to "); + { + int i; + u_char *ptr = (u_char *)skb->data; + for (i = 0; i < 6; i++) + printk("%02x", ptr[i]); + } + printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len); +#endif + + local_irq_save(flags); + + entry = priv->cur_tx % TX_RING_SIZE; + + /* Caution: the write order is important here, set the base address with + the "ownership" bits last. */ + + priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len); + priv->tx_ring[entry]->TMD3 = 0x0000; + memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len); + +#if 0 + { + int i, len; + + len = skb->len > 64 ? 64 : skb->len; + len >>= 1; + for (i = 0; i < len; i += 8) { + int j; + printk(KERN_DEBUG "%04x:", i); + for (j = 0; (j < 8) && ((i+j) < len); j++) { + if (!(j & 1)) + printk(" "); + printk("%04x", priv->tx_buff[entry][i+j]); + } + printk("\n"); + } + } +#endif + + priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP; + + dev_kfree_skb(skb); + + priv->cur_tx++; + if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) { + +#if 0 + printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and " + "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx); +#endif + + priv->cur_tx -= TX_RING_SIZE; + priv->dirty_tx -= TX_RING_SIZE; + } + + /* Trigger an immediate send poll. */ + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + lance->RDP = INEA|TDMD; + + dev->trans_start = jiffies; + + if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) { + netif_stop_queue(dev); + priv->tx_full = 1; + } + local_irq_restore(flags); + + return 0; +} + + +static int ariadne_rx(struct net_device *dev) +{ + struct ariadne_private *priv = netdev_priv(dev); + int entry = priv->cur_rx % RX_RING_SIZE; + int i; + + /* If we own the next entry, it's a new packet. Send it up. */ + while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) { + int status = lowb(priv->rx_ring[entry]->RMD1); + + if (status != (RF_STP|RF_ENP)) { /* 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 & RF_ENP) + /* Only count a general error at the end of a packet.*/ + priv->stats.rx_errors++; + if (status & RF_FRAM) + priv->stats.rx_frame_errors++; + if (status & RF_OFLO) + priv->stats.rx_over_errors++; + if (status & RF_CRC) + priv->stats.rx_crc_errors++; + if (status & RF_BUFF) + priv->stats.rx_fifo_errors++; + priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP; + } else { + /* Malloc up new buffer, compatible with net-3. */ + short pkt_len = swapw(priv->rx_ring[entry]->RMD3); + struct sk_buff *skb; + + skb = dev_alloc_skb(pkt_len+2); + if (skb == NULL) { + printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n", + dev->name); + for (i = 0; i < RX_RING_SIZE; i++) + if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN) + break; + + if (i > RX_RING_SIZE-2) { + priv->stats.rx_dropped++; + priv->rx_ring[entry]->RMD1 |= RF_OWN; + priv->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, (char *)priv->rx_buff[entry], pkt_len,0); + skb->protocol=eth_type_trans(skb,dev); +#if 0 + printk(KERN_DEBUG "RX pkt type 0x%04x from ", + ((u_short *)skb->data)[6]); + { + int i; + u_char *ptr = &((u_char *)skb->data)[6]; + for (i = 0; i < 6; i++) + printk("%02x", ptr[i]); + } + printk(" to "); + { + int i; + u_char *ptr = (u_char *)skb->data; + for (i = 0; i < 6; i++) + printk("%02x", ptr[i]); + } + printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len); +#endif + + netif_rx(skb); + dev->last_rx = jiffies; + priv->stats.rx_packets++; + priv->stats.rx_bytes += pkt_len; + } + + priv->rx_ring[entry]->RMD1 |= RF_OWN; + entry = (++priv->cur_rx) % RX_RING_SIZE; + } + + priv->cur_rx = priv->cur_rx % RX_RING_SIZE; + + /* 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 struct net_device_stats *ariadne_get_stats(struct net_device *dev) +{ + struct ariadne_private *priv = netdev_priv(dev); + volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr; + short saved_addr; + unsigned long flags; + + local_irq_save(flags); + saved_addr = lance->RAP; + lance->RAP = CSR112; /* Missed Frame Count */ + priv->stats.rx_missed_errors = swapw(lance->RDP); + lance->RAP = saved_addr; + local_irq_restore(flags); + + return &priv->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 net_device *dev) +{ + volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr; + + if (!netif_running(dev)) + return; + + netif_stop_queue(dev); + + /* We take the simple way out and always enable promiscuous mode. */ + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + lance->RDP = STOP; /* Temporarily stop the lance. */ + ariadne_init_ring(dev); + + if (dev->flags & IFF_PROMISC) { + /* Log any net taps. */ + printk(KERN_INFO "%s: Promiscuous mode enabled.\n", dev->name); + lance->RAP = CSR15; /* Mode Register */ + lance->RDP = PROM; /* Set promiscuous mode */ + } else { + short multicast_table[4]; + int num_addrs = dev->mc_count; + 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++) { + lance->RAP = CSR8+(i<<8); /* Logical Address Filter */ + lance->RDP = swapw(multicast_table[i]); + } + lance->RAP = CSR15; /* Mode Register */ + lance->RDP = 0x0000; /* Unset promiscuous mode */ + } + + lance->RAP = CSR0; /* PCnet-ISA Controller Status */ + lance->RDP = INEA|STRT|IDON; /* Resume normal operation. */ + + netif_wake_queue(dev); +} + + +static void __devexit ariadne_remove_one(struct zorro_dev *z) +{ + struct net_device *dev = zorro_get_drvdata(z); + + unregister_netdev(dev); + release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960)); + release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE); + free_netdev(dev); +} + +static int __init ariadne_init_module(void) +{ + return zorro_module_init(&ariadne_driver); +} + +static void __exit ariadne_cleanup_module(void) +{ + zorro_unregister_driver(&ariadne_driver); +} + +module_init(ariadne_init_module); +module_exit(ariadne_cleanup_module); + +MODULE_LICENSE("GPL"); |