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         u8 mac[ETH_ALEN];
  82
  83         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
  84         ca = platform_get_resource(dev, IORESOURCE_MEM, 1);
  85         options = platform_get_resource(dev, 0, 0);
  86         idprom = platform_get_resource(dev, IORESOURCE_MEM, 2);
  87         if (!res || !ca || !options || !idprom)
  88                 return -ENODEV;
  89         mpu_addr = ioremap(res->start, 4);
  90         if (!mpu_addr)
  91                 return -ENOMEM;
  92         ca_addr = ioremap(ca->start, 4);
  93         if (!ca_addr)
  94                 goto probe_failed_free_mpu;
  95
  96         printk(KERN_INFO "Found i82596 at 0x%x\n", res->start);
  97
  98         netdevice = alloc_etherdev(sizeof(struct i596_private));
  99         if (!netdevice)
 100                 goto probe_failed_free_ca;
 101
 102         SET_NETDEV_DEV(netdevice, &dev->dev);
 103         platform_set_drvdata (dev, netdevice);
 104
 105         netdevice->base_addr = res->start;
 106         netdevice->irq = platform_get_irq(dev, 0);
 107
 108         eth_addr = ioremap(idprom->start, 0x10);
 109         if (!eth_addr)
 110                 goto probe_failed;
 111
 112         /* someone seems to like messed up stuff */
 113         mac[0] = readb(eth_addr + 0x0b);
 114         mac[1] = readb(eth_addr + 0x0a);
 115         mac[2] = readb(eth_addr + 0x09);
 116         mac[3] = readb(eth_addr + 0x08);
 117         mac[4] = readb(eth_addr + 0x07);
 118         mac[5] = readb(eth_addr + 0x06);
 119         eth_hw_addr_set(netdevice, mac);
 120         iounmap(eth_addr);
 121
 122         if (netdevice->irq < 0) {
 123                 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
 124                         __FILE__, netdevice->base_addr);
 125                 retval = netdevice->irq;
 126                 goto probe_failed;
 127         }
 128
 129         lp = netdev_priv(netdevice);
 130         lp->options = options->flags & IORESOURCE_BITS;
 131         lp->ca = ca_addr;
 132         lp->mpu_port = mpu_addr;
 133
 134         lp->dma = dma_alloc_coherent(&dev->dev, sizeof(struct i596_dma),
 135                                      &lp->dma_addr, GFP_KERNEL);
 136         if (!lp->dma)
 137                 goto probe_failed;
 138
 139         retval = i82596_probe(netdevice);
 140         if (retval)
 141                 goto probe_failed_free_dma;
 142         return 0;
 143
 144 probe_failed_free_dma:
 145         dma_free_coherent(&dev->dev, sizeof(struct i596_dma), lp->dma,
 146                           lp->dma_addr);
 147 probe_failed:
 148         free_netdev(netdevice);
 149 probe_failed_free_ca:
 150         iounmap(ca_addr);
 151 probe_failed_free_mpu:
 152         iounmap(mpu_addr);
 153         return retval;
 154 }
 155
 156 static void sni_82596_driver_remove(struct platform_device *pdev)
 157 {
 158         struct net_device *dev = platform_get_drvdata(pdev);
 159         struct i596_private *lp = netdev_priv(dev);
 160
 161         unregister_netdev(dev);
 162         dma_free_coherent(&pdev->dev, sizeof(struct i596_private), lp->dma,
 163                           lp->dma_addr);
 164         iounmap(lp->ca);
 165         iounmap(lp->mpu_port);
 166         free_netdev (dev);
 167 }
 168
 169 static struct platform_driver sni_82596_driver = {
 170         .probe  = sni_82596_probe,
 171         .remove = sni_82596_driver_remove,
 172         .driver = {
 173                 .name   = sni_82596_string,
 174         },
 175 };
 176
 177 static int sni_82596_init(void)
 178 {
 179         printk(KERN_INFO SNI_82596_DRIVER_VERSION "\n");
 180         return platform_driver_register(&sni_82596_driver);
 181 }
 182
 183
 184 static void __exit sni_82596_exit(void)
 185 {
 186         platform_driver_unregister(&sni_82596_driver);
 187 }
 188
 189 module_init(sni_82596_init);
 190 module_exit(sni_82596_exit);