drivers/net/ethernet/i825xx/sni_82596.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sni_82596.c -- driver for intel 82596 ethernet controller, as
   4  *                used in older SNI RM machines
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/kernel.h>
   9 #include <linux/string.h>
  10 #include <linux/errno.h>
  11 #include <linux/ioport.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/delay.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/types.h>
  18 #include <linux/bitops.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/io.h>
  21 #include <linux/irq.h>
  22
  23 #define SNI_82596_DRIVER_VERSION "SNI RM 82596 driver - Revision: 0.01"
  24
  25 static const char sni_82596_string[] = "snirm_82596";
  26
  27 #define SYSBUS      0x00004400
  28
  29 /* big endian CPU, 82596 little endian */
  30 #define SWAP32(x)   cpu_to_le32((u32)(x))
  31 #define SWAP16(x)   cpu_to_le16((u16)(x))
  32
  33 #define OPT_MPU_16BIT    0x01
  34
  35 #include "lib82596.c"
  36
  37 MODULE_AUTHOR("Thomas Bogendoerfer");
  38 MODULE_DESCRIPTION("i82596 driver");
  39 MODULE_LICENSE("GPL");
  40 MODULE_ALIAS("platform:snirm_82596");
  41 module_param(i596_debug, int, 0);
  42 MODULE_PARM_DESC(i596_debug, "82596 debug mask");
  43
  44 static inline void ca(struct net_device *dev)
  45 {
  46         struct i596_private *lp = netdev_priv(dev);
  47
  48         writel(0, lp->ca);
  49 }
  50
  51
  52 static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
  53 {
  54         struct i596_private *lp = netdev_priv(dev);
  55
  56         u32 v = (u32) (c) | (u32) (x);
  57
  58         if (lp->options & OPT_MPU_16BIT) {
  59                 writew(v & 0xffff, lp->mpu_port);
  60                 wmb();  /* order writes to MPU port */
  61                 udelay(1);
  62                 writew(v >> 16, lp->mpu_port);
  63         } else {
  64                 writel(v, lp->mpu_port);
  65                 wmb();  /* order writes to MPU port */
  66                 udelay(1);
  67                 writel(v, lp->mpu_port);
  68         }
  69 }
  70
  71
  72 static int sni_82596_probe(struct platform_device *dev)
  73 {
  74         struct  net_device *netdevice;
  75         struct i596_private *lp;
  76         struct  resource *res, *ca, *idprom, *options;
  77         int     retval = -ENOMEM;
  78         void __iomem *mpu_addr;
  79         void __iomem *ca_addr;
  80         u8 __iomem *eth_addr;
  81
  82         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
  83         ca = platform_get_resource(dev, IORESOURCE_MEM, 1);
  84         options = platform_get_resource(dev, 0, 0);
  85         idprom = platform_get_resource(dev, IORESOURCE_MEM, 2);
  86         if (!res || !ca || !options || !idprom)
  87                 return -ENODEV;
  88         mpu_addr = ioremap(res->start, 4);
  89         if (!mpu_addr)
  90                 return -ENOMEM;
  91         ca_addr = ioremap(ca->start, 4);
  92         if (!ca_addr)
  93                 goto probe_failed_free_mpu;
  94
  95         printk(KERN_INFO "Found i82596 at 0x%x\n", res->start);
  96
  97         netdevice = alloc_etherdev(sizeof(struct i596_private));
  98         if (!netdevice)
  99                 goto probe_failed_free_ca;
 100
 101         SET_NETDEV_DEV(netdevice, &dev->dev);
 102         platform_set_drvdata (dev, netdevice);
 103
 104         netdevice->base_addr = res->start;
 105         netdevice->irq = platform_get_irq(dev, 0);
 106
 107         eth_addr = ioremap(idprom->start, 0x10);
 108         if (!eth_addr)
 109                 goto probe_failed;
 110
 111         /* someone seems to like messed up stuff */
 112         netdevice->dev_addr[0] = readb(eth_addr + 0x0b);
 113         netdevice->dev_addr[1] = readb(eth_addr + 0x0a);
 114         netdevice->dev_addr[2] = readb(eth_addr + 0x09);
 115         netdevice->dev_addr[3] = readb(eth_addr + 0x08);
 116         netdevice->dev_addr[4] = readb(eth_addr + 0x07);
 117         netdevice->dev_addr[5] = readb(eth_addr + 0x06);
 118         iounmap(eth_addr);
 119
 120         if (!netdevice->irq) {
 121                 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
 122                         __FILE__, netdevice->base_addr);
 123                 goto probe_failed;
 124         }
 125
 126         lp = netdev_priv(netdevice);
 127         lp->options = options->flags & IORESOURCE_BITS;
 128         lp->ca = ca_addr;
 129         lp->mpu_port = mpu_addr;
 130
 131         lp->dma = dma_alloc_coherent(&dev->dev, sizeof(struct i596_dma),
 132                                      &lp->dma_addr, GFP_KERNEL);
 133         if (!lp->dma)
 134                 goto probe_failed;
 135
 136         retval = i82596_probe(netdevice);
 137         if (retval)
 138                 goto probe_failed_free_dma;
 139         return 0;
 140
 141 probe_failed_free_dma:
 142         dma_free_coherent(&dev->dev, sizeof(struct i596_dma), lp->dma,
 143                           lp->dma_addr);
 144 probe_failed:
 145         free_netdev(netdevice);
 146 probe_failed_free_ca:
 147         iounmap(ca_addr);
 148 probe_failed_free_mpu:
 149         iounmap(mpu_addr);
 150         return retval;
 151 }
 152
 153 static int sni_82596_driver_remove(struct platform_device *pdev)
 154 {
 155         struct net_device *dev = platform_get_drvdata(pdev);
 156         struct i596_private *lp = netdev_priv(dev);
 157
 158         unregister_netdev(dev);
 159         dma_free_coherent(&pdev->dev, sizeof(struct i596_private), lp->dma,
 160                           lp->dma_addr);
 161         iounmap(lp->ca);
 162         iounmap(lp->mpu_port);
 163         free_netdev (dev);
 164         return 0;
 165 }
 166
 167 static struct platform_driver sni_82596_driver = {
 168         .probe  = sni_82596_probe,
 169         .remove = sni_82596_driver_remove,
 170         .driver = {
 171                 .name   = sni_82596_string,
 172         },
 173 };
 174
 175 static int sni_82596_init(void)
 176 {
 177         printk(KERN_INFO SNI_82596_DRIVER_VERSION "\n");
 178         return platform_driver_register(&sni_82596_driver);
 179 }
 180
 181
 182 static void __exit sni_82596_exit(void)
 183 {
 184         platform_driver_unregister(&sni_82596_driver);
 185 }
 186
 187 module_init(sni_82596_init);
 188 module_exit(sni_82596_exit);