// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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/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 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 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;
        u8 mac[ETH_ALEN];

        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(res->start, 4);
        if (!mpu_addr)
                return -ENOMEM;
        ca_addr = ioremap(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(idprom->start, 0x10);
        if (!eth_addr)
                goto probe_failed;

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

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

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

        lp->dma = dma_alloc_coherent(&dev->dev, sizeof(struct i596_dma),
                                     &lp->dma_addr, GFP_KERNEL);
        if (!lp->dma)
                goto probe_failed;

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

probe_failed_free_dma:
        dma_free_coherent(&dev->dev, sizeof(struct i596_dma), lp->dma,
                          lp->dma_addr);
probe_failed:
        free_netdev(netdevice);
probe_failed_free_ca:
        iounmap(ca_addr);
probe_failed_free_mpu:
        iounmap(mpu_addr);
        return retval;
}

static void 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_coherent(&pdev->dev, sizeof(struct i596_private), lp->dma,
                          lp->dma_addr);
        iounmap(lp->ca);
        iounmap(lp->mpu_port);
        free_netdev (dev);
}

static struct platform_driver sni_82596_driver = {
        .probe  = sni_82596_probe,
        .remove = sni_82596_driver_remove,
        .driver = {
                .name   = sni_82596_string,
        },
};

static int 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);