sni_82596.c

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/*
 * sni_82596.c -- driver for intel 82596 ethernet controller, as
 *            used in older SNI RM machines
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/irq.h>

#define SNI_82596_DRIVER_VERSION "SNI RM 82596 driver - Revision: 0.01"

static const char sni_82596_string[] = "snirm_82596";

#define DMA_ALLOC                      dma_alloc_coherent
#define DMA_FREE                       dma_free_coherent
#define DMA_WBACK(priv, addr, len)     do { } while (0)
#define DMA_INV(priv, addr, len)       do { } while (0)
#define DMA_WBACK_INV(priv, addr, len) do { } while (0)

#define SYSBUS      0x00004400

/* big endian CPU, 82596 little endian */
#define SWAP32(x)   cpu_to_le32((u32)(x))
#define SWAP16(x)   cpu_to_le16((u16)(x))

#define OPT_MPU_16BIT    0x01

#include "lib82596.c"

MODULE_AUTHOR("Thomas Bogendoerfer");
MODULE_DESCRIPTION("i82596 driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:snirm_82596");
module_param(i596_debug, int, 0);
MODULE_PARM_DESC(i596_debug, "82596 debug mask");

static inline void ca(struct net_device *dev)
{
    struct i596_private *lp = netdev_priv(dev);

    writel(0, lp->ca);
}


static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
{
    struct i596_private *lp = netdev_priv(dev);

    u32 v = (u32) (c) | (u32) (x);

    if (lp->options & OPT_MPU_16BIT) {
        writew(v & 0xffff, lp->mpu_port);
        wmb();  /* order writes to MPU port */
        udelay(1);
        writew(v >> 16, lp->mpu_port);
    } else {
        writel(v, lp->mpu_port);
        wmb();  /* order writes to MPU port */
        udelay(1);
        writel(v, lp->mpu_port);
    }
}


static int __devinit sni_82596_probe(struct platform_device *dev)
{
    struct  net_device *netdevice;
    struct i596_private *lp;
    struct  resource *res, *ca, *idprom, *options;
    int retval = -ENOMEM;
    void __iomem *mpu_addr;
    void __iomem *ca_addr;
    u8 __iomem *eth_addr;

    res = platform_get_resource(dev, IORESOURCE_MEM, 0);
    ca = platform_get_resource(dev, IORESOURCE_MEM, 1);
    options = platform_get_resource(dev, 0, 0);
    idprom = platform_get_resource(dev, IORESOURCE_MEM, 2);
    if (!res || !ca || !options || !idprom)
        return -ENODEV;
    mpu_addr = ioremap_nocache(res->start, 4);
    if (!mpu_addr)
        return -ENOMEM;
    ca_addr = ioremap_nocache(ca->start, 4);
    if (!ca_addr)
        goto probe_failed_free_mpu;

    printk(KERN_INFO "Found i82596 at 0x%x\n", res->start);

    netdevice = alloc_etherdev(sizeof(struct i596_private));
    if (!netdevice)
        goto probe_failed_free_ca;

    SET_NETDEV_DEV(netdevice, &dev->dev);
    platform_set_drvdata (dev, netdevice);

    netdevice->base_addr = res->start;
    netdevice->irq = platform_get_irq(dev, 0);

    eth_addr = ioremap_nocache(idprom->start, 0x10);
    if (!eth_addr)
        goto probe_failed;

    /* someone seems to like messed up stuff */
    netdevice->dev_addr[0] = readb(eth_addr + 0x0b);
    netdevice->dev_addr[1] = readb(eth_addr + 0x0a);
    netdevice->dev_addr[2] = readb(eth_addr + 0x09);
    netdevice->dev_addr[3] = readb(eth_addr + 0x08);
    netdevice->dev_addr[4] = readb(eth_addr + 0x07);
    netdevice->dev_addr[5] = readb(eth_addr + 0x06);
    iounmap(eth_addr);

    if (!netdevice->irq) {
        printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
            __FILE__, netdevice->base_addr);
        goto probe_failed;
    }

    lp = netdev_priv(netdevice);
    lp->options = options->flags & IORESOURCE_BITS;
    lp->ca = ca_addr;
    lp->mpu_port = mpu_addr;

    retval = i82596_probe(netdevice);
    if (retval == 0)
        return 0;

probe_failed:
    free_netdev(netdevice);
probe_failed_free_ca:
    iounmap(ca_addr);
probe_failed_free_mpu:
    iounmap(mpu_addr);
    return retval;
}

static int __devexit sni_82596_driver_remove(struct platform_device *pdev)
{
    struct net_device *dev = platform_get_drvdata(pdev);
    struct i596_private *lp = netdev_priv(dev);

    unregister_netdev(dev);
    DMA_FREE(dev->dev.parent, sizeof(struct i596_private),
         lp->dma, lp->dma_addr);
    iounmap(lp->ca);
    iounmap(lp->mpu_port);
    free_netdev (dev);
    return 0;
}

static struct platform_driver sni_82596_driver = {
    .probe  = sni_82596_probe,
    .remove = __devexit_p(sni_82596_driver_remove),
    .driver = {
        .name   = sni_82596_string,
        .owner  = THIS_MODULE,
    },
};

static int __devinit sni_82596_init(void)
{
    printk(KERN_INFO SNI_82596_DRIVER_VERSION "\n");
    return platform_driver_register(&sni_82596_driver);
}


static void __exit sni_82596_exit(void)
{
    platform_driver_unregister(&sni_82596_driver);
}

module_init(sni_82596_init);
module_exit(sni_82596_exit);