7990.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:21k
- /*
- * 7990.c -- LANCE ethernet IC generic routines.
- * This is an attempt to separate out the bits of various ethernet
- * drivers that are common because they all use the AMD 7990 LANCE
- * (Local Area Network Controller for Ethernet) chip.
- *
- * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
- *
- * Most of this stuff was obtained by looking at other LANCE drivers,
- * in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
- * NB: this was made easy by the fact that Jes Sorensen had cleaned up
- * most of a2025 and sunlance with the aim of merging them, so the
- * common code was pretty obvious.
- */
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/fcntl.h>
- #include <linux/interrupt.h>
- #include <linux/ptrace.h>
- #include <linux/ioport.h>
- #include <linux/in.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/crc32.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <asm/io.h>
- #include <asm/dma.h>
- #include <asm/pgtable.h>
- #include <linux/errno.h>
- /* Used for the temporal inet entries and routing */
- #include <linux/socket.h>
- #include <linux/route.h>
- #include <linux/dio.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include "7990.h"
- /* Lossage Factor Nine, Mr Sulu. */
- #define WRITERAP(x) (lp->writerap(lp,x))
- #define WRITERDP(x) (lp->writerdp(lp,x))
- #define READRDP() (lp->readrdp(lp))
- /* These used to be ll->rap = x, ll->rdp = x, and (ll->rdp). Sigh.
- * If you want to switch them back then
- * #define DECLARE_LL volatile struct lance_regs *ll = lp->ll
- */
- #define DECLARE_LL /* nothing to declare */
- /* debugging output macros, various flavours */
- /* #define TEST_HITS */
- #ifdef UNDEF
- #define PRINT_RINGS()
- do {
- int t;
- for (t=0; t < RX_RING_SIZE; t++) {
- printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02Xn",
- t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0,
- ib->brx_ring[t].length,
- ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits);
- }
- for (t=0; t < TX_RING_SIZE; t++) {
- printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02Xn",
- t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0,
- ib->btx_ring[t].length,
- ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits);
- }
- } while (0)
- #else
- #define PRINT_RINGS()
- #endif
- /* Load the CSR registers. The LANCE has to be STOPped when we do this! */
- static void load_csrs (struct lance_private *lp)
- {
- volatile struct lance_init_block *aib = lp->lance_init_block;
- int leptr;
- DECLARE_LL;
- leptr = LANCE_ADDR (aib);
- WRITERAP(LE_CSR1); /* load address of init block */
- WRITERDP(leptr & 0xFFFF);
- WRITERAP(LE_CSR2);
- WRITERDP(leptr >> 16);
- WRITERAP(LE_CSR3);
- WRITERDP(lp->busmaster_regval); /* set byteswap/ALEctrl/byte ctrl */
- /* Point back to csr0 */
- WRITERAP(LE_CSR0);
- }
- /* #define to 0 or 1 appropriately */
- #define DEBUG_IRING 0
- /* Set up the Lance Rx and Tx rings and the init block */
- static void lance_init_ring (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *) dev->priv;
- volatile struct lance_init_block *ib = lp->init_block;
- volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */
- int leptr;
- int i;
- aib = lp->lance_init_block;
- lp->rx_new = lp->tx_new = 0;
- lp->rx_old = lp->tx_old = 0;
- ib->mode = LE_MO_PROM; /* normal, enable Tx & Rx */
- /* Copy the ethernet address to the lance init block
- * Notice that we do a byteswap if we're big endian.
- * [I think this is the right criterion; at least, sunlance,
- * a2065 and atarilance do the byteswap and lance.c (PC) doesn't.
- * However, the datasheet says that the BSWAP bit doesn't affect
- * the init block, so surely it should be low byte first for
- * everybody? Um.]
- * We could define the ib->physaddr as three 16bit values and
- * use (addr[1] << 8) | addr[0] & co, but this is more efficient.
- */
- #ifdef __BIG_ENDIAN
- ib->phys_addr [0] = dev->dev_addr [1];
- ib->phys_addr [1] = dev->dev_addr [0];
- ib->phys_addr [2] = dev->dev_addr [3];
- ib->phys_addr [3] = dev->dev_addr [2];
- ib->phys_addr [4] = dev->dev_addr [5];
- ib->phys_addr [5] = dev->dev_addr [4];
- #else
- for (i=0; i<6; i++)
- ib->phys_addr[i] = dev->dev_addr[i];
- #endif
- if (DEBUG_IRING)
- printk ("TX rings:n");
-
- lp->tx_full = 0;
- /* Setup the Tx ring entries */
- for (i = 0; i < (1<<lp->lance_log_tx_bufs); i++) {
- leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
- ib->btx_ring [i].tmd0 = leptr;
- ib->btx_ring [i].tmd1_hadr = leptr >> 16;
- ib->btx_ring [i].tmd1_bits = 0;
- ib->btx_ring [i].length = 0xf000; /* The ones required by tmd2 */
- ib->btx_ring [i].misc = 0;
- if (DEBUG_IRING)
- printk ("%d: 0x%8.8xn", i, leptr);
- }
- /* Setup the Rx ring entries */
- if (DEBUG_IRING)
- printk ("RX rings:n");
- for (i = 0; i < (1<<lp->lance_log_rx_bufs); i++) {
- leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
- ib->brx_ring [i].rmd0 = leptr;
- ib->brx_ring [i].rmd1_hadr = leptr >> 16;
- ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
- /* 0xf000 == bits that must be one (reserved, presumably) */
- ib->brx_ring [i].length = -RX_BUFF_SIZE | 0xf000;
- ib->brx_ring [i].mblength = 0;
- if (DEBUG_IRING)
- printk ("%d: 0x%8.8xn", i, leptr);
- }
- /* Setup the initialization block */
-
- /* Setup rx descriptor pointer */
- leptr = LANCE_ADDR(&aib->brx_ring);
- ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
- ib->rx_ptr = leptr;
- if (DEBUG_IRING)
- printk ("RX ptr: %8.8xn", leptr);
-
- /* Setup tx descriptor pointer */
- leptr = LANCE_ADDR(&aib->btx_ring);
- ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
- ib->tx_ptr = leptr;
- if (DEBUG_IRING)
- printk ("TX ptr: %8.8xn", leptr);
- /* Clear the multicast filter */
- ib->filter [0] = 0;
- ib->filter [1] = 0;
- PRINT_RINGS();
- }
- /* LANCE must be STOPped before we do this, too... */
- static int init_restart_lance (struct lance_private *lp)
- {
- int i;
- DECLARE_LL;
- WRITERAP(LE_CSR0);
- WRITERDP(LE_C0_INIT);
- /* Need a hook here for sunlance ledma stuff */
- /* Wait for the lance to complete initialization */
- for (i = 0; (i < 100) && !(READRDP() & (LE_C0_ERR | LE_C0_IDON)); i++)
- barrier();
- if ((i == 100) || (READRDP() & LE_C0_ERR)) {
- printk ("LANCE unopened after %d ticks, csr0=%4.4x.n", i, READRDP());
- return -1;
- }
- /* Clear IDON by writing a "1", enable interrupts and start lance */
- WRITERDP(LE_C0_IDON);
- WRITERDP(LE_C0_INEA | LE_C0_STRT);
- return 0;
- }
- static int lance_reset (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *)dev->priv;
- int status;
- DECLARE_LL;
-
- /* Stop the lance */
- WRITERAP(LE_CSR0);
- WRITERDP(LE_C0_STOP);
- load_csrs (lp);
- lance_init_ring (dev);
- dev->trans_start = jiffies;
- status = init_restart_lance (lp);
- #ifdef DEBUG_DRIVER
- printk ("Lance restart=%dn", status);
- #endif
- return status;
- }
- static int lance_rx (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *) dev->priv;
- volatile struct lance_init_block *ib = lp->init_block;
- volatile struct lance_rx_desc *rd;
- unsigned char bits;
- int len = 0; /* XXX shut up gcc warnings */
- struct sk_buff *skb = 0; /* XXX shut up gcc warnings */
- #ifdef TEST_HITS
- int i;
- #endif
- DECLARE_LL;
- #ifdef TEST_HITS
- printk ("[");
- for (i = 0; i < RX_RING_SIZE; i++) {
- if (i == lp->rx_new)
- printk ("%s",
- ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "_" : "X");
- else
- printk ("%s",
- ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "." : "1");
- }
- printk ("]");
- #endif
-
- WRITERDP(LE_C0_RINT | LE_C0_INEA); /* ack Rx int, reenable ints */
- for (rd = &ib->brx_ring [lp->rx_new]; /* For each Rx ring we own... */
- !((bits = rd->rmd1_bits) & LE_R1_OWN);
- rd = &ib->brx_ring [lp->rx_new]) {
- /* We got an incomplete frame? */
- if ((bits & LE_R1_POK) != LE_R1_POK) {
- lp->stats.rx_over_errors++;
- lp->stats.rx_errors++;
- continue;
- } else if (bits & LE_R1_ERR) {
- /* Count only the end frame as a rx error,
- * not the beginning
- */
- if (bits & LE_R1_BUF) lp->stats.rx_fifo_errors++;
- if (bits & LE_R1_CRC) lp->stats.rx_crc_errors++;
- if (bits & LE_R1_OFL) lp->stats.rx_over_errors++;
- if (bits & LE_R1_FRA) lp->stats.rx_frame_errors++;
- if (bits & LE_R1_EOP) lp->stats.rx_errors++;
- } else {
- len = (rd->mblength & 0xfff) - 4;
- skb = dev_alloc_skb (len+2);
- if (skb == 0) {
- printk ("%s: Memory squeeze, deferring packet.n",
- dev->name);
- lp->stats.rx_dropped++;
- rd->mblength = 0;
- rd->rmd1_bits = LE_R1_OWN;
- lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
- return 0;
- }
-
- skb->dev = dev;
- skb_reserve (skb, 2); /* 16 byte align */
- skb_put (skb, len); /* make room */
- eth_copy_and_sum(skb,
- (unsigned char *)&(ib->rx_buf [lp->rx_new][0]),
- len, 0);
- skb->protocol = eth_type_trans (skb, dev);
- netif_rx (skb);
- dev->last_rx = jiffies;
- lp->stats.rx_packets++;
- lp->stats.rx_bytes += len;
- }
- /* Return the packet to the pool */
- rd->mblength = 0;
- rd->rmd1_bits = LE_R1_OWN;
- lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
- }
- return 0;
- }
- static int lance_tx (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *) dev->priv;
- volatile struct lance_init_block *ib = lp->init_block;
- volatile struct lance_tx_desc *td;
- int i, j;
- int status;
- DECLARE_LL;
- /* csr0 is 2f3 */
- WRITERDP(LE_C0_TINT | LE_C0_INEA);
- /* csr0 is 73 */
- j = lp->tx_old;
- for (i = j; i != lp->tx_new; i = j) {
- td = &ib->btx_ring [i];
- /* If we hit a packet not owned by us, stop */
- if (td->tmd1_bits & LE_T1_OWN)
- break;
-
- if (td->tmd1_bits & LE_T1_ERR) {
- status = td->misc;
-
- lp->stats.tx_errors++;
- if (status & LE_T3_RTY) lp->stats.tx_aborted_errors++;
- if (status & LE_T3_LCOL) lp->stats.tx_window_errors++;
- if (status & LE_T3_CLOS) {
- lp->stats.tx_carrier_errors++;
- if (lp->auto_select) {
- lp->tpe = 1 - lp->tpe;
- printk("%s: Carrier Lost, trying %sn",
- dev->name, lp->tpe?"TPE":"AUI");
- /* Stop the lance */
- WRITERAP(LE_CSR0);
- WRITERDP(LE_C0_STOP);
- lance_init_ring (dev);
- load_csrs (lp);
- init_restart_lance (lp);
- return 0;
- }
- }
- /* buffer errors and underflows turn off the transmitter */
- /* Restart the adapter */
- if (status & (LE_T3_BUF|LE_T3_UFL)) {
- lp->stats.tx_fifo_errors++;
- printk ("%s: Tx: ERR_BUF|ERR_UFL, restartingn",
- dev->name);
- /* Stop the lance */
- WRITERAP(LE_CSR0);
- WRITERDP(LE_C0_STOP);
- lance_init_ring (dev);
- load_csrs (lp);
- init_restart_lance (lp);
- return 0;
- }
- } else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
- /*
- * So we don't count the packet more than once.
- */
- td->tmd1_bits &= ~(LE_T1_POK);
- /* One collision before packet was sent. */
- if (td->tmd1_bits & LE_T1_EONE)
- lp->stats.collisions++;
- /* More than one collision, be optimistic. */
- if (td->tmd1_bits & LE_T1_EMORE)
- lp->stats.collisions += 2;
- lp->stats.tx_packets++;
- }
-
- j = (j + 1) & lp->tx_ring_mod_mask;
- }
- lp->tx_old = j;
- WRITERDP(LE_C0_TINT | LE_C0_INEA);
- return 0;
- }
- static void lance_interrupt (int irq, void *dev_id, struct pt_regs *regs)
- {
- struct net_device *dev = (struct net_device *)dev_id;
- struct lance_private *lp = (struct lance_private *)dev->priv;
- int csr0;
- DECLARE_LL;
- spin_lock (&lp->devlock);
- WRITERAP(LE_CSR0); /* LANCE Controller Status */
- csr0 = READRDP();
- PRINT_RINGS();
-
- if (!(csr0 & LE_C0_INTR)) { /* Check if any interrupt has */
- spin_lock (&lp->devlock);
- return; /* been generated by the Lance. */
- }
- /* Acknowledge all the interrupt sources ASAP */
- WRITERDP(csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
- if ((csr0 & LE_C0_ERR)) {
- /* Clear the error condition */
- WRITERDP(LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
- }
- if (csr0 & LE_C0_RINT)
- lance_rx (dev);
- if (csr0 & LE_C0_TINT)
- lance_tx (dev);
- /* Log misc errors. */
- if (csr0 & LE_C0_BABL)
- lp->stats.tx_errors++; /* Tx babble. */
- if (csr0 & LE_C0_MISS)
- lp->stats.rx_errors++; /* Missed a Rx frame. */
- if (csr0 & LE_C0_MERR) {
- printk("%s: Bus master arbitration failure, status %4.4x.n",
- dev->name, csr0);
- /* Restart the chip. */
- WRITERDP(LE_C0_STRT);
- }
- if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {
- lp->tx_full = 0;
- netif_wake_queue (dev);
- }
-
- WRITERAP(LE_CSR0);
- WRITERDP(LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
- spin_unlock (&lp->devlock);
- }
- int lance_open (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *)dev->priv;
- int res;
- DECLARE_LL;
-
- /* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
- if (request_irq(lp->irq, lance_interrupt, 0, lp->name, dev))
- return -EAGAIN;
- res = lance_reset(dev);
- lp->devlock = SPIN_LOCK_UNLOCKED;
- netif_start_queue (dev);
- return res;
- }
- int lance_close (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *) dev->priv;
- DECLARE_LL;
-
- netif_stop_queue (dev);
- /* Stop the LANCE */
- WRITERAP(LE_CSR0);
- WRITERDP(LE_C0_STOP);
- free_irq(lp->irq, dev);
- return 0;
- }
- void lance_tx_timeout(struct net_device *dev)
- {
- printk("lance_tx_timeoutn");
- lance_reset(dev);
- dev->trans_start = jiffies;
- netif_wake_queue (dev);
- }
- int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *)dev->priv;
- volatile struct lance_init_block *ib = lp->init_block;
- int entry, skblen, len;
- static int outs;
- unsigned long flags;
- DECLARE_LL;
- if (!TX_BUFFS_AVAIL)
- return -1;
- netif_stop_queue (dev);
- skblen = skb->len;
- #ifdef DEBUG_DRIVER
- /* dump the packet */
- {
- int i;
-
- for (i = 0; i < 64; i++) {
- if ((i % 16) == 0)
- printk ("n");
- printk ("%2.2x ", skb->data [i]);
- }
- }
- #endif
- len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
- entry = lp->tx_new & lp->tx_ring_mod_mask;
- ib->btx_ring [entry].length = (-len) | 0xf000;
- ib->btx_ring [entry].misc = 0;
-
- memcpy ((char *)&ib->tx_buf [entry][0], skb->data, skblen);
-
- /* Now, give the packet to the lance */
- ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
- lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
- outs++;
- /* Kick the lance: transmit now */
- WRITERDP(LE_C0_INEA | LE_C0_TDMD);
- dev->trans_start = jiffies;
- dev_kfree_skb (skb);
-
- spin_lock_irqsave (&lp->devlock, flags);
- if (TX_BUFFS_AVAIL)
- netif_start_queue (dev);
- else
- lp->tx_full = 1;
- spin_unlock_irqrestore (&lp->devlock, flags);
- return 0;
- }
- struct net_device_stats *lance_get_stats (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *) dev->priv;
- return &lp->stats;
- }
- /* taken from the depca driver via a2065.c */
- static void lance_load_multicast (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *) dev->priv;
- volatile struct lance_init_block *ib = lp->init_block;
- volatile u16 *mcast_table = (u16 *)&ib->filter;
- struct dev_mc_list *dmi=dev->mc_list;
- char *addrs;
- int i;
- u32 crc;
-
- /* set all multicast bits */
- if (dev->flags & IFF_ALLMULTI){
- ib->filter [0] = 0xffffffff;
- ib->filter [1] = 0xffffffff;
- return;
- }
- /* clear the multicast filter */
- ib->filter [0] = 0;
- ib->filter [1] = 0;
- /* Add addresses */
- for (i = 0; i < dev->mc_count; i++){
- addrs = dmi->dmi_addr;
- dmi = dmi->next;
- /* multicast address? */
- if (!(*addrs & 1))
- continue;
-
- crc = ether_crc_le(6, addrs);
- crc = crc >> 26;
- mcast_table [crc >> 4] |= 1 << (crc & 0xf);
- }
- return;
- }
- void lance_set_multicast (struct net_device *dev)
- {
- struct lance_private *lp = (struct lance_private *) dev->priv;
- volatile struct lance_init_block *ib = lp->init_block;
- int stopped;
- DECLARE_LL;
- stopped = netif_queue_stopped(dev);
- if (!stopped)
- netif_stop_queue (dev);
- while (lp->tx_old != lp->tx_new)
- schedule();
- WRITERAP(LE_CSR0);
- WRITERDP(LE_C0_STOP);
- lance_init_ring (dev);
- if (dev->flags & IFF_PROMISC) {
- ib->mode |= LE_MO_PROM;
- } else {
- ib->mode &= ~LE_MO_PROM;
- lance_load_multicast (dev);
- }
- load_csrs (lp);
- init_restart_lance (lp);
- if (!stopped)
- netif_start_queue (dev);
- }
- MODULE_LICENSE("GPL");