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