mvme147.c

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/* mvme147.c  : the  Linux/mvme147/lance ethernet driver
 *
 * Copyright (C) 05/1998 Peter Maydell <[email protected]>
 * Based on the Sun Lance driver and the NetBSD HP Lance driver
 * Uses the generic 7990.c LANCE code.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/gfp.h>
/* Used for the temporal inet entries and routing */
#include <linux/socket.h>
#include <linux/route.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/mvme147hw.h>

/* We have 16834 bytes of RAM for the init block and buffers. This places
 * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
 * buffers and 2 Tx buffers.
 */
#define LANCE_LOG_TX_BUFFERS 1
#define LANCE_LOG_RX_BUFFERS 3

#include "7990.h"                                 /* use generic LANCE code */

/* Our private data structure */
struct m147lance_private {
    struct lance_private lance;
    unsigned long ram;
};

/* function prototypes... This is easy because all the grot is in the
 * generic LANCE support. All we have to support is probing for boards,
 * plus board-specific init, open and close actions.
 * Oh, and we need to tell the generic code how to read and write LANCE registers...
 */
static int m147lance_open(struct net_device *dev);
static int m147lance_close(struct net_device *dev);
static void m147lance_writerap(struct lance_private *lp, unsigned short value);
static void m147lance_writerdp(struct lance_private *lp, unsigned short value);
static unsigned short m147lance_readrdp(struct lance_private *lp);

typedef void (*writerap_t)(void *, unsigned short);
typedef void (*writerdp_t)(void *, unsigned short);
typedef unsigned short (*readrdp_t)(void *);

static const struct net_device_ops lance_netdev_ops = {
    .ndo_open       = m147lance_open,
    .ndo_stop       = m147lance_close,
    .ndo_start_xmit     = lance_start_xmit,
    .ndo_set_rx_mode    = lance_set_multicast,
    .ndo_tx_timeout     = lance_tx_timeout,
    .ndo_change_mtu     = eth_change_mtu,
    .ndo_validate_addr  = eth_validate_addr,
    .ndo_set_mac_address    = eth_mac_addr,
};

/* Initialise the one and only on-board 7990 */
struct net_device * __init mvme147lance_probe(int unit)
{
    struct net_device *dev;
    static int called;
    static const char name[] = "MVME147 LANCE";
    struct m147lance_private *lp;
    u_long *addr;
    u_long address;
    int err;

    if (!MACH_IS_MVME147 || called)
        return ERR_PTR(-ENODEV);
    called++;

    dev = alloc_etherdev(sizeof(struct m147lance_private));
    if (!dev)
        return ERR_PTR(-ENOMEM);

    if (unit >= 0)
        sprintf(dev->name, "eth%d", unit);

    /* Fill the dev fields */
    dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
    dev->netdev_ops = &lance_netdev_ops;
    dev->dma = 0;

    addr=(u_long *)ETHERNET_ADDRESS;
    address = *addr;
    dev->dev_addr[0]=0x08;
    dev->dev_addr[1]=0x00;
    dev->dev_addr[2]=0x3e;
    address=address>>8;
    dev->dev_addr[5]=address&0xff;
    address=address>>8;
    dev->dev_addr[4]=address&0xff;
    address=address>>8;
    dev->dev_addr[3]=address&0xff;

    printk("%s: MVME147 at 0x%08lx, irq %d, "
           "Hardware Address %pM\n",
           dev->name, dev->base_addr, MVME147_LANCE_IRQ,
           dev->dev_addr);

    lp = netdev_priv(dev);
    lp->ram = __get_dma_pages(GFP_ATOMIC, 3);   /* 16K */
    if (!lp->ram)
    {
        printk("%s: No memory for LANCE buffers\n", dev->name);
        free_netdev(dev);
        return ERR_PTR(-ENOMEM);
    }

    lp->lance.name = (char*)name;                   /* discards const, shut up gcc */
    lp->lance.base = dev->base_addr;
    lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
    lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
    lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
    lp->lance.irq = MVME147_LANCE_IRQ;
    lp->lance.writerap = (writerap_t)m147lance_writerap;
    lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
    lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
    lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
    lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
    lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
    lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;

    err = register_netdev(dev);
    if (err) {
        free_pages(lp->ram, 3);
        free_netdev(dev);
        return ERR_PTR(err);
    }

    return dev;
}

static void m147lance_writerap(struct lance_private *lp, unsigned short value)
{
    out_be16(lp->base + LANCE_RAP, value);
}

static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
{
    out_be16(lp->base + LANCE_RDP, value);
}

static unsigned short m147lance_readrdp(struct lance_private *lp)
{
    return in_be16(lp->base + LANCE_RDP);
}

static int m147lance_open(struct net_device *dev)
{
    int status;

    status = lance_open(dev);                 /* call generic lance open code */
    if (status)
        return status;
    /* enable interrupts at board level. */
    m147_pcc->lan_cntrl=0;       /* clear the interrupts (if any) */
    m147_pcc->lan_cntrl=0x08 | 0x04;     /* Enable irq 4 */

    return 0;
}

static int m147lance_close(struct net_device *dev)
{
    /* disable interrupts at boardlevel */
    m147_pcc->lan_cntrl=0x0; /* disable interrupts */
    lance_close(dev);
    return 0;
}

#ifdef MODULE
MODULE_LICENSE("GPL");

static struct net_device *dev_mvme147_lance;
int __init init_module(void)
{
    dev_mvme147_lance = mvme147lance_probe(-1);
    if (IS_ERR(dev_mvme147_lance))
        return PTR_ERR(dev_mvme147_lance);
    return 0;
}

void __exit cleanup_module(void)
{
    struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
    unregister_netdev(dev_mvme147_lance);
    free_pages(lp->ram, 3);
    free_netdev(dev_mvme147_lance);
}

#endif /* MODULE */