drivers/net/mvme147.c

   1 /* mvme147.c  : the  Linux/mvme147/lance ethernet driver
   2  *
   3  * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
   4  * Based on the Sun Lance driver and the NetBSD HP Lance driver
   5  * Uses the generic 7990.c LANCE code.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/types.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/ioport.h>
  13 #include <linux/slab.h>
  14 #include <linux/string.h>
  15 #include <linux/delay.h>
  16 #include <linux/init.h>
  17 #include <linux/errno.h>
  18 /* Used for the temporal inet entries and routing */
  19 #include <linux/socket.h>
  20 #include <linux/route.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/skbuff.h>
  24
  25 #include <asm/system.h>
  26 #include <asm/io.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/mvme147hw.h>
  29
  30 /* We have 16834 bytes of RAM for the init block and buffers. This places
  31  * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
  32  * buffers and 2 Tx buffers.
  33  */
  34 #define LANCE_LOG_TX_BUFFERS 1
  35 #define LANCE_LOG_RX_BUFFERS 3
  36
  37 #include "7990.h"                                 /* use generic LANCE code */
  38
  39 /* Our private data structure */
  40 struct m147lance_private {
  41         struct lance_private lance;
  42         unsigned long ram;
  43 };
  44
  45 /* function prototypes... This is easy because all the grot is in the
  46  * generic LANCE support. All we have to support is probing for boards,
  47  * plus board-specific init, open and close actions.
  48  * Oh, and we need to tell the generic code how to read and write LANCE registers...
  49  */
  50 static int m147lance_open(struct net_device *dev);
  51 static int m147lance_close(struct net_device *dev);
  52 static void m147lance_writerap(struct lance_private *lp, unsigned short value);
  53 static void m147lance_writerdp(struct lance_private *lp, unsigned short value);
  54 static unsigned short m147lance_readrdp(struct lance_private *lp);
  55
  56 typedef void (*writerap_t)(void *, unsigned short);
  57 typedef void (*writerdp_t)(void *, unsigned short);
  58 typedef unsigned short (*readrdp_t)(void *);
  59
  60 static const struct net_device_ops lance_netdev_ops = {
  61         .ndo_open               = m147lance_open,
  62         .ndo_stop               = m147lance_close,
  63         .ndo_start_xmit         = lance_start_xmit,
  64         .ndo_set_multicast_list = lance_set_multicast,
  65         .ndo_tx_timeout         = lance_tx_timeout,
  66         .ndo_change_mtu         = eth_change_mtu,
  67         .ndo_validate_addr      = eth_validate_addr,
  68         .ndo_set_mac_address    = eth_mac_addr,
  69 };
  70
  71 /* Initialise the one and only on-board 7990 */
  72 struct net_device * __init mvme147lance_probe(int unit)
  73 {
  74         struct net_device *dev;
  75         static int called;
  76         static const char name[] = "MVME147 LANCE";
  77         struct m147lance_private *lp;
  78         u_long *addr;
  79         u_long address;
  80         int err;
  81
  82         if (!MACH_IS_MVME147 || called)
  83                 return ERR_PTR(-ENODEV);
  84         called++;
  85
  86         dev = alloc_etherdev(sizeof(struct m147lance_private));
  87         if (!dev)
  88                 return ERR_PTR(-ENOMEM);
  89
  90         if (unit >= 0)
  91                 sprintf(dev->name, "eth%d", unit);
  92
  93         /* Fill the dev fields */
  94         dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
  95         dev->netdev_ops = &lance_netdev_ops;
  96         dev->dma = 0;
  97
  98         addr=(u_long *)ETHERNET_ADDRESS;
  99         address = *addr;
 100         dev->dev_addr[0]=0x08;
 101         dev->dev_addr[1]=0x00;
 102         dev->dev_addr[2]=0x3e;
 103         address=address>>8;
 104         dev->dev_addr[5]=address&0xff;
 105         address=address>>8;
 106         dev->dev_addr[4]=address&0xff;
 107         address=address>>8;
 108         dev->dev_addr[3]=address&0xff;
 109
 110         printk("%s: MVME147 at 0x%08lx, irq %d, "
 111                "Hardware Address %pM\n",
 112                dev->name, dev->base_addr, MVME147_LANCE_IRQ,
 113                dev->dev_addr);
 114
 115         lp = netdev_priv(dev);
 116         lp->ram = __get_dma_pages(GFP_ATOMIC, 3);       /* 16K */
 117         if (!lp->ram)
 118         {
 119                 printk("%s: No memory for LANCE buffers\n", dev->name);
 120                 free_netdev(dev);
 121                 return ERR_PTR(-ENOMEM);
 122         }
 123
 124         lp->lance.name = (char*)name;                   /* discards const, shut up gcc */
 125         lp->lance.base = dev->base_addr;
 126         lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
 127         lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
 128         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 129         lp->lance.irq = MVME147_LANCE_IRQ;
 130         lp->lance.writerap = (writerap_t)m147lance_writerap;
 131         lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
 132         lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
 133         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 134         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 135         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 136         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 137
 138         err = register_netdev(dev);
 139         if (err) {
 140                 free_pages(lp->ram, 3);
 141                 free_netdev(dev);
 142                 return ERR_PTR(err);
 143         }
 144
 145         return dev;
 146 }
 147
 148 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
 149 {
 150         out_be16(lp->base + LANCE_RAP, value);
 151 }
 152
 153 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
 154 {
 155         out_be16(lp->base + LANCE_RDP, value);
 156 }
 157
 158 static unsigned short m147lance_readrdp(struct lance_private *lp)
 159 {
 160         return in_be16(lp->base + LANCE_RDP);
 161 }
 162
 163 static int m147lance_open(struct net_device *dev)
 164 {
 165         int status;
 166
 167         status = lance_open(dev);                 /* call generic lance open code */
 168         if (status)
 169                 return status;
 170         /* enable interrupts at board level. */
 171         m147_pcc->lan_cntrl=0;       /* clear the interrupts (if any) */
 172         m147_pcc->lan_cntrl=0x08 | 0x04;     /* Enable irq 4 */
 173
 174         return 0;
 175 }
 176
 177 static int m147lance_close(struct net_device *dev)
 178 {
 179         /* disable interrupts at boardlevel */
 180         m147_pcc->lan_cntrl=0x0; /* disable interrupts */
 181         lance_close(dev);
 182         return 0;
 183 }
 184
 185 #ifdef MODULE
 186 MODULE_LICENSE("GPL");
 187
 188 static struct net_device *dev_mvme147_lance;
 189 int __init init_module(void)
 190 {
 191         dev_mvme147_lance = mvme147lance_probe(-1);
 192         if (IS_ERR(dev_mvme147_lance))
 193                 return PTR_ERR(dev_mvme147_lance);
 194         return 0;
 195 }
 196
 197 void __exit cleanup_module(void)
 198 {
 199         struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
 200         unregister_netdev(dev_mvme147_lance);
 201         free_pages(lp->ram, 3);
 202         free_netdev(dev_mvme147_lance);
 203 }
 204
 205 #endif /* MODULE */