ariadne.c

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/*
 *  Amiga Linux/m68k Ariadne Ethernet Driver
 *
 *  © Copyright 1995-2003 by Geert Uytterhoeven ([e-mail])
 *			     Peter De Schrijver ([e-mail])
 *
 *  ---------------------------------------------------------------------------
 *
 *  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);
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;
    DECLARE_MAC_BUF(mac);

    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;
    }

    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 "
	   "%s\n", dev->name, board,
	   print_mac(mac, dev->dev_addr));

    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, IRQF_SHARED,
                    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 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);