am79c961a.c
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上传日期:2013-04-10
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文件大小:16k
- /*
- * linux/drivers/net/am79c961.c
- *
- * by Russell King <rmk@arm.linux.org.uk> 1995-2001.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Derived from various things including skeleton.c
- *
- * This is a special driver for the am79c961A Lance chip used in the
- * Intel (formally Digital Equipment Corp) EBSA110 platform. Please
- * note that this can not be built as a module (it doesn't make sense).
- */
- #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/errno.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/crc32.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <asm/irq.h>
- #include <asm/io.h>
- #include <asm/dma.h>
- #define TX_BUFFERS 15
- #define RX_BUFFERS 25
- #include "am79c961a.h"
- static void am79c961_interrupt (int irq, void *dev_id, struct pt_regs *regs);
- static unsigned int net_debug = NET_DEBUG;
- static const char version[] =
- "am79c961 ethernet driver (C) 1995-2001 Russell King v0.04n";
- /* --------------------------------------------------------------------------- */
- #ifdef __arm__
- static void write_rreg(u_long base, u_int reg, u_int val)
- {
- __asm__("str%?h %1, [%2] @ NET_RAP
- str%?h %0, [%2, #-4] @ NET_RDP
- " : : "r" (val), "r" (reg), "r" (ISAIO_BASE + 0x0464));
- }
- static inline unsigned short read_rreg(u_long base_addr, u_int reg)
- {
- unsigned short v;
- __asm__("str%?h %1, [%2] @ NET_RAP
- ldr%?h %0, [%2, #-4] @ NET_RDP
- " : "=r" (v): "r" (reg), "r" (ISAIO_BASE + 0x0464));
- return v;
- }
- static inline void write_ireg(u_long base, u_int reg, u_int val)
- {
- __asm__("str%?h %1, [%2] @ NET_RAP
- str%?h %0, [%2, #8] @ NET_IDP
- " : : "r" (val), "r" (reg), "r" (ISAIO_BASE + 0x0464));
- }
- #define am_writeword(dev,off,val) __raw_writew(val, ISAMEM_BASE + ((off) << 1))
- #define am_readword(dev,off) __raw_readw(ISAMEM_BASE + ((off) << 1))
- static inline void
- am_writebuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
- {
- offset = ISAMEM_BASE + (offset << 1);
- length = (length + 1) & ~1;
- if ((int)buf & 2) {
- __asm__ __volatile__("str%?h %2, [%0], #4"
- : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
- buf += 2;
- length -= 2;
- }
- while (length > 8) {
- unsigned int tmp, tmp2;
- __asm__ __volatile__("
- ldm%?ia %1!, {%2, %3}
- str%?h %2, [%0], #4
- mov%? %2, %2, lsr #16
- str%?h %2, [%0], #4
- str%?h %3, [%0], #4
- mov%? %3, %3, lsr #16
- str%?h %3, [%0], #4
- " : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2)
- : "0" (offset), "1" (buf));
- length -= 8;
- }
- while (length > 0) {
- __asm__ __volatile__("str%?h %2, [%0], #4"
- : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
- buf += 2;
- length -= 2;
- }
- }
- static inline void
- am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
- {
- offset = ISAMEM_BASE + (offset << 1);
- length = (length + 1) & ~1;
- if ((int)buf & 2) {
- unsigned int tmp;
- __asm__ __volatile__("
- ldr%?h %2, [%0], #4
- str%?b %2, [%1], #1
- mov%? %2, %2, lsr #8
- str%?b %2, [%1], #1
- " : "=&r" (offset), "=&r" (buf), "=r" (tmp): "0" (offset), "1" (buf));
- length -= 2;
- }
- while (length > 8) {
- unsigned int tmp, tmp2, tmp3;
- __asm__ __volatile__("
- ldr%?h %2, [%0], #4
- ldr%?h %3, [%0], #4
- orr%? %2, %2, %3, lsl #16
- ldr%?h %3, [%0], #4
- ldr%?h %4, [%0], #4
- orr%? %3, %3, %4, lsl #16
- stm%?ia %1!, {%2, %3}
- " : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2), "=r" (tmp3)
- : "0" (offset), "1" (buf));
- length -= 8;
- }
- while (length > 0) {
- unsigned int tmp;
- __asm__ __volatile__("
- ldr%?h %2, [%0], #4
- str%?b %2, [%1], #1
- mov%? %2, %2, lsr #8
- str%?b %2, [%1], #1
- " : "=&r" (offset), "=&r" (buf), "=r" (tmp) : "0" (offset), "1" (buf));
- length -= 2;
- }
- }
- #else
- #error Not compatable
- #endif
- static int
- am79c961_ramtest(struct net_device *dev, unsigned int val)
- {
- unsigned char *buffer = kmalloc (65536, GFP_KERNEL);
- int i, error = 0, errorcount = 0;
- if (!buffer)
- return 0;
- memset (buffer, val, 65536);
- am_writebuffer(dev, 0, buffer, 65536);
- memset (buffer, val ^ 255, 65536);
- am_readbuffer(dev, 0, buffer, 65536);
- for (i = 0; i < 65536; i++) {
- if (buffer[i] != val && !error) {
- printk ("%s: buffer error (%02X %02X) %05X - ", dev->name, val, buffer[i], i);
- error = 1;
- errorcount ++;
- } else if (error && buffer[i] == val) {
- printk ("%05Xn", i);
- error = 0;
- }
- }
- if (error)
- printk ("10000n");
- kfree (buffer);
- return errorcount;
- }
- static void
- am79c961_init_for_open(struct net_device *dev)
- {
- struct dev_priv *priv = (struct dev_priv *)dev->priv;
- unsigned long flags;
- unsigned char *p;
- u_int hdr_addr, first_free_addr;
- int i;
- /*
- * Stop the chip.
- */
- spin_lock_irqsave(priv->chip_lock, flags);
- write_rreg (dev->base_addr, CSR0, CSR0_BABL|CSR0_CERR|CSR0_MISS|CSR0_MERR|CSR0_TINT|CSR0_RINT|CSR0_STOP);
- spin_unlock_irqrestore(priv->chip_lock, flags);
- write_ireg (dev->base_addr, 5, 0x00a0); /* Receive address LED */
- write_ireg (dev->base_addr, 6, 0x0081); /* Collision LED */
- write_ireg (dev->base_addr, 7, 0x0090); /* XMIT LED */
- write_ireg (dev->base_addr, 2, 0x0000); /* MODE register selects media */
- for (i = LADRL; i <= LADRH; i++)
- write_rreg (dev->base_addr, i, 0);
- for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2)
- write_rreg (dev->base_addr, i, p[0] | (p[1] << 8));
- i = MODE_PORT_10BT;
- if (dev->flags & IFF_PROMISC)
- i |= MODE_PROMISC;
- write_rreg (dev->base_addr, MODE, i);
- write_rreg (dev->base_addr, POLLINT, 0);
- write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS);
- write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS);
- first_free_addr = RX_BUFFERS * 8 + TX_BUFFERS * 8 + 16;
- hdr_addr = 0;
- priv->rxhead = 0;
- priv->rxtail = 0;
- priv->rxhdr = hdr_addr;
- for (i = 0; i < RX_BUFFERS; i++) {
- priv->rxbuffer[i] = first_free_addr;
- am_writeword (dev, hdr_addr, first_free_addr);
- am_writeword (dev, hdr_addr + 2, RMD_OWN);
- am_writeword (dev, hdr_addr + 4, (-1600));
- am_writeword (dev, hdr_addr + 6, 0);
- first_free_addr += 1600;
- hdr_addr += 8;
- }
- priv->txhead = 0;
- priv->txtail = 0;
- priv->txhdr = hdr_addr;
- for (i = 0; i < TX_BUFFERS; i++) {
- priv->txbuffer[i] = first_free_addr;
- am_writeword (dev, hdr_addr, first_free_addr);
- am_writeword (dev, hdr_addr + 2, TMD_STP|TMD_ENP);
- am_writeword (dev, hdr_addr + 4, 0xf000);
- am_writeword (dev, hdr_addr + 6, 0);
- first_free_addr += 1600;
- hdr_addr += 8;
- }
- write_rreg (dev->base_addr, BASERXL, priv->rxhdr);
- write_rreg (dev->base_addr, BASERXH, 0);
- write_rreg (dev->base_addr, BASETXL, priv->txhdr);
- write_rreg (dev->base_addr, BASERXH, 0);
- write_rreg (dev->base_addr, CSR0, CSR0_STOP);
- write_rreg (dev->base_addr, CSR3, CSR3_IDONM|CSR3_BABLM|CSR3_DXSUFLO);
- write_rreg (dev->base_addr, CSR0, CSR0_IENA|CSR0_STRT);
- }
- /*
- * Open/initialize the board.
- */
- static int
- am79c961_open(struct net_device *dev)
- {
- struct dev_priv *priv = (struct dev_priv *)dev->priv;
- int ret;
- memset (&priv->stats, 0, sizeof (priv->stats));
- ret = request_irq(dev->irq, am79c961_interrupt, 0, dev->name, dev);
- if (ret)
- return ret;
- am79c961_init_for_open(dev);
- netif_start_queue(dev);
- return 0;
- }
- /*
- * The inverse routine to am79c961_open().
- */
- static int
- am79c961_close(struct net_device *dev)
- {
- struct dev_priv *priv = (struct dev_priv *)dev->priv;
- unsigned long flags;
- netif_stop_queue(dev);
- spin_lock_irqsave(priv->chip_lock, flags);
- write_rreg (dev->base_addr, CSR0, CSR0_STOP);
- write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
- spin_unlock_irqrestore(priv->chip_lock, flags);
- free_irq (dev->irq, dev);
- return 0;
- }
- /*
- * Get the current statistics.
- */
- static struct net_device_stats *am79c961_getstats (struct net_device *dev)
- {
- struct dev_priv *priv = (struct dev_priv *)dev->priv;
- return &priv->stats;
- }
- static void am79c961_mc_hash(struct dev_mc_list *dmi, unsigned short *hash)
- {
- if (dmi->dmi_addrlen == ETH_ALEN && dmi->dmi_addr[0] & 0x01) {
- int idx, bit;
- u32 crc;
- crc = ether_crc_le(ETH_ALEN, dmi->dmi_addr);
- idx = crc >> 30;
- bit = (crc >> 26) & 15;
- hash[idx] |= 1 << bit;
- }
- }
- /*
- * Set or clear promiscuous/multicast mode filter for this adapter.
- */
- static void am79c961_setmulticastlist (struct net_device *dev)
- {
- struct dev_priv *priv = (struct dev_priv *)dev->priv;
- unsigned long flags;
- unsigned short multi_hash[4], mode;
- int i, stopped;
- mode = MODE_PORT_10BT;
- if (dev->flags & IFF_PROMISC) {
- mode |= MODE_PROMISC;
- } else if (dev->flags & IFF_ALLMULTI) {
- memset(multi_hash, 0xff, sizeof(multi_hash));
- } else {
- struct dev_mc_list *dmi;
- memset(multi_hash, 0x00, sizeof(multi_hash));
- for (dmi = dev->mc_list; dmi; dmi = dmi->next)
- am79c961_mc_hash(dmi, multi_hash);
- }
- spin_lock_irqsave(priv->chip_lock, flags);
- stopped = read_rreg(dev->base_addr, CSR0) & CSR0_STOP;
- if (!stopped) {
- /*
- * Put the chip into suspend mode
- */
- write_rreg(dev->base_addr, CTRL1, CTRL1_SPND);
- /*
- * Spin waiting for chip to report suspend mode
- */
- while ((read_rreg(dev->base_addr, CTRL1) & CTRL1_SPND) == 0) {
- spin_unlock_irqrestore(priv->chip_lock, flags);
- nop();
- spin_lock_irqsave(priv->chip_lock, flags);
- }
- }
- /*
- * Update the multicast hash table
- */
- for (i = 0; i < sizeof(multi_hash) / sizeof(multi_hash[0]); i++)
- write_rreg(dev->base_addr, i + LADRL, multi_hash[i]);
- /*
- * Write the mode register
- */
- write_rreg(dev->base_addr, MODE, mode);
- if (!stopped) {
- /*
- * Put the chip back into running mode
- */
- write_rreg(dev->base_addr, CTRL1, 0);
- }
- spin_unlock_irqrestore(priv->chip_lock, flags);
- }
- static void am79c961_timeout(struct net_device *dev)
- {
- printk(KERN_WARNING "%s: transmit timed out, network cable problem?n",
- dev->name);
- /*
- * ought to do some setup of the tx side here
- */
- netif_wake_queue(dev);
- }
- /*
- * Transmit a packet
- */
- static int
- am79c961_sendpacket(struct sk_buff *skb, struct net_device *dev)
- {
- struct dev_priv *priv = (struct dev_priv *)dev->priv;
- unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
- unsigned int hdraddr, bufaddr;
- unsigned int head;
- unsigned long flags;
- head = priv->txhead;
- hdraddr = priv->txhdr + (head << 3);
- bufaddr = priv->txbuffer[head];
- head += 1;
- if (head >= TX_BUFFERS)
- head = 0;
- am_writebuffer (dev, bufaddr, skb->data, length);
- am_writeword (dev, hdraddr + 4, -length);
- am_writeword (dev, hdraddr + 2, TMD_OWN|TMD_STP|TMD_ENP);
- priv->txhead = head;
- spin_lock_irqsave(priv->chip_lock, flags);
- write_rreg (dev->base_addr, CSR0, CSR0_TDMD|CSR0_IENA);
- dev->trans_start = jiffies;
- spin_unlock_irqrestore(priv->chip_lock, flags);
- /*
- * If the next packet is owned by the ethernet device,
- * then the tx ring is full and we can't add another
- * packet.
- */
- if (am_readword(dev, priv->txhdr + (priv->txhead << 3) + 2) & TMD_OWN)
- netif_stop_queue(dev);
- dev_kfree_skb(skb);
- return 0;
- }
- /*
- * If we have a good packet(s), get it/them out of the buffers.
- */
- static void
- am79c961_rx(struct net_device *dev, struct dev_priv *priv)
- {
- do {
- struct sk_buff *skb;
- u_int hdraddr;
- u_int pktaddr;
- u_int status;
- int len;
- hdraddr = priv->rxhdr + (priv->rxtail << 3);
- pktaddr = priv->rxbuffer[priv->rxtail];
- status = am_readword (dev, hdraddr + 2);
- if (status & RMD_OWN) /* do we own it? */
- break;
- priv->rxtail ++;
- if (priv->rxtail >= RX_BUFFERS)
- priv->rxtail = 0;
- if ((status & (RMD_ERR|RMD_STP|RMD_ENP)) != (RMD_STP|RMD_ENP)) {
- am_writeword (dev, hdraddr + 2, RMD_OWN);
- priv->stats.rx_errors ++;
- if (status & RMD_ERR) {
- if (status & RMD_FRAM)
- priv->stats.rx_frame_errors ++;
- if (status & RMD_CRC)
- priv->stats.rx_crc_errors ++;
- } else if (status & RMD_STP)
- priv->stats.rx_length_errors ++;
- continue;
- }
- len = am_readword(dev, hdraddr + 6);
- skb = dev_alloc_skb(len + 2);
- if (skb) {
- skb->dev = dev;
- skb_reserve(skb, 2);
- am_readbuffer(dev, pktaddr, skb_put(skb, len), len);
- am_writeword(dev, hdraddr + 2, RMD_OWN);
- skb->protocol = eth_type_trans(skb, dev);
- netif_rx(skb);
- dev->last_rx = jiffies;
- priv->stats.rx_bytes += len;
- priv->stats.rx_packets ++;
- } else {
- am_writeword (dev, hdraddr + 2, RMD_OWN);
- printk (KERN_WARNING "%s: memory squeeze, dropping packet.n", dev->name);
- priv->stats.rx_dropped ++;
- break;
- }
- } while (1);
- }
- /*
- * Update stats for the transmitted packet
- */
- static void
- am79c961_tx(struct net_device *dev, struct dev_priv *priv)
- {
- do {
- u_int hdraddr;
- u_int status;
- hdraddr = priv->txhdr + (priv->txtail << 3);
- status = am_readword (dev, hdraddr + 2);
- if (status & TMD_OWN)
- break;
- priv->txtail ++;
- if (priv->txtail >= TX_BUFFERS)
- priv->txtail = 0;
- if (status & TMD_ERR) {
- u_int status2;
- priv->stats.tx_errors ++;
- status2 = am_readword (dev, hdraddr + 6);
- /*
- * Clear the error byte
- */
- am_writeword (dev, hdraddr + 6, 0);
- if (status2 & TST_RTRY)
- priv->stats.collisions += 16;
- if (status2 & TST_LCOL)
- priv->stats.tx_window_errors ++;
- if (status2 & TST_LCAR)
- priv->stats.tx_carrier_errors ++;
- if (status2 & TST_UFLO)
- priv->stats.tx_fifo_errors ++;
- continue;
- }
- priv->stats.tx_packets ++;
- } while (priv->txtail != priv->txhead);
- netif_wake_queue(dev);
- }
- static void
- am79c961_interrupt(int irq, void *dev_id, struct pt_regs *regs)
- {
- struct net_device *dev = (struct net_device *)dev_id;
- struct dev_priv *priv = (struct dev_priv *)dev->priv;
- u_int status;
- status = read_rreg(dev->base_addr, CSR0);
- write_rreg(dev->base_addr, CSR0, status & (CSR0_TINT|CSR0_RINT|CSR0_MISS|CSR0_IENA));
- if (status & CSR0_RINT)
- am79c961_rx(dev, priv);
- if (status & CSR0_TINT)
- am79c961_tx(dev, priv);
- if (status & CSR0_MISS)
- priv->stats.rx_dropped ++;
- }
- /*
- * Initialise the chip. Note that we always expect
- * to be entered with interrupts enabled.
- */
- static int
- am79c961_hw_init(struct net_device *dev)
- {
- struct dev_priv *priv = (struct dev_priv *)dev->priv;
- spin_lock_irq(priv->chip_lock);
- write_rreg (dev->base_addr, CSR0, CSR0_STOP);
- write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
- spin_unlock_irq(priv->chip_lock);
- am79c961_ramtest(dev, 0x66);
- am79c961_ramtest(dev, 0x99);
- return 0;
- }
- static void __init am79c961_banner(void)
- {
- static unsigned version_printed;
- if (net_debug && version_printed++ == 0)
- printk(KERN_INFO "%s", version);
- }
- static int __init am79c961_init(void)
- {
- struct net_device *dev;
- struct dev_priv *priv;
- int i, ret;
- dev = init_etherdev(NULL, sizeof(struct dev_priv));
- ret = -ENOMEM;
- if (!dev)
- goto out;
- priv = dev->priv;
- /*
- * Fixed address and IRQ lines here.
- * The PNP initialisation should have been
- * done by the ether bootp loader.
- */
- dev->base_addr = 0x220;
- dev->irq = IRQ_EBSA110_ETHERNET;
- /*
- * Reset the device.
- */
- inb(dev->base_addr + NET_RESET);
- udelay(5);
- /*
- * Check the manufacturer part of the
- * ether address.
- */
- ret = -ENODEV;
- if (inb(dev->base_addr) != 0x08 ||
- inb(dev->base_addr + 2) != 0x00 ||
- inb(dev->base_addr + 4) != 0x2b)
- goto nodev;
- if (!request_region(dev->base_addr, 0x18, dev->name))
- goto nodev;
- am79c961_banner();
- printk(KERN_INFO "%s: ether address ", dev->name);
- /* Retrive and print the ethernet address. */
- for (i = 0; i < 6; i++) {
- dev->dev_addr[i] = inb(dev->base_addr + i * 2) & 0xff;
- printk (i == 5 ? "%02xn" : "%02x:", dev->dev_addr[i]);
- }
- if (am79c961_hw_init(dev))
- goto release;
- dev->open = am79c961_open;
- dev->stop = am79c961_close;
- dev->hard_start_xmit = am79c961_sendpacket;
- dev->get_stats = am79c961_getstats;
- dev->set_multicast_list = am79c961_setmulticastlist;
- dev->tx_timeout = am79c961_timeout;
- return 0;
- release:
- release_region(dev->base_addr, 0x18);
- nodev:
- unregister_netdev(dev);
- kfree(dev);
- out:
- return ret;
- }
- __initcall(am79c961_init);