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 /* Initialise the one and only on-board 7990 */
  61 struct net_device * __init mvme147lance_probe(int unit)
  62 {
  63         struct net_device *dev;
  64         static int called;
  65         static const char name[] = "MVME147 LANCE";
  66         struct m147lance_private *lp;
  67         u_long *addr;
  68         u_long address;
  69         int err;
  70         DECLARE_MAC_BUF(mac);
  71
  72         if (!MACH_IS_MVME147 || called)
  73                 return ERR_PTR(-ENODEV);
  74         called++;
  75
  76         dev = alloc_etherdev(sizeof(struct m147lance_private));
  77         if (!dev)
  78                 return ERR_PTR(-ENOMEM);
  79
  80         if (unit >= 0)
  81                 sprintf(dev->name, "eth%d", unit);
  82
  83         /* Fill the dev fields */
  84         dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
  85         dev->open = &m147lance_open;
  86         dev->stop = &m147lance_close;
  87         dev->hard_start_xmit = &lance_start_xmit;
  88         dev->set_multicast_list = &lance_set_multicast;
  89         dev->tx_timeout = &lance_tx_timeout;
  90         dev->dma = 0;
  91
  92         addr=(u_long *)ETHERNET_ADDRESS;
  93         address = *addr;
  94         dev->dev_addr[0]=0x08;
  95         dev->dev_addr[1]=0x00;
  96         dev->dev_addr[2]=0x3e;
  97         address=address>>8;
  98         dev->dev_addr[5]=address&0xff;
  99         address=address>>8;
 100         dev->dev_addr[4]=address&0xff;
 101         address=address>>8;
 102         dev->dev_addr[3]=address&0xff;
 103
 104         printk("%s: MVME147 at 0x%08lx, irq %d, "
 105                "Hardware Address %s\n",
 106                dev->name, dev->base_addr, MVME147_LANCE_IRQ,
 107                print_mac(mac, dev->dev_addr));
 108
 109         lp = (struct m147lance_private *)dev->priv;
 110         lp->ram = __get_dma_pages(GFP_ATOMIC, 3);       /* 16K */
 111         if (!lp->ram)
 112         {
 113                 printk("%s: No memory for LANCE buffers\n", dev->name);
 114                 free_netdev(dev);
 115                 return ERR_PTR(-ENOMEM);
 116         }
 117
 118         lp->lance.name = (char*)name;                   /* discards const, shut up gcc */
 119         lp->lance.base = dev->base_addr;
 120         lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
 121         lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
 122         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 123         lp->lance.irq = MVME147_LANCE_IRQ;
 124         lp->lance.writerap = (writerap_t)m147lance_writerap;
 125         lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
 126         lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
 127         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 128         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 129         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 130         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 131
 132         err = register_netdev(dev);
 133         if (err) {
 134                 free_pages(lp->ram, 3);
 135                 free_netdev(dev);
 136                 return ERR_PTR(err);
 137         }
 138
 139         return dev;
 140 }
 141
 142 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
 143 {
 144         out_be16(lp->base + LANCE_RAP, value);
 145 }
 146
 147 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
 148 {
 149         out_be16(lp->base + LANCE_RDP, value);
 150 }
 151
 152 static unsigned short m147lance_readrdp(struct lance_private *lp)
 153 {
 154         return in_be16(lp->base + LANCE_RDP);
 155 }
 156
 157 static int m147lance_open(struct net_device *dev)
 158 {
 159         int status;
 160
 161         status = lance_open(dev);                 /* call generic lance open code */
 162         if (status)
 163                 return status;
 164         /* enable interrupts at board level. */
 165         m147_pcc->lan_cntrl=0;       /* clear the interrupts (if any) */
 166         m147_pcc->lan_cntrl=0x08 | 0x04;     /* Enable irq 4 */
 167
 168         return 0;
 169 }
 170
 171 static int m147lance_close(struct net_device *dev)
 172 {
 173         /* disable interrupts at boardlevel */
 174         m147_pcc->lan_cntrl=0x0; /* disable interrupts */
 175         lance_close(dev);
 176         return 0;
 177 }
 178
 179 #ifdef MODULE
 180 MODULE_LICENSE("GPL");
 181
 182 static struct net_device *dev_mvme147_lance;
 183 int __init init_module(void)
 184 {
 185         dev_mvme147_lance = mvme147lance_probe(-1);
 186         if (IS_ERR(dev_mvme147_lance))
 187                 return PTR_ERR(dev_mvme147_lance);
 188         return 0;
 189 }
 190
 191 void __exit cleanup_module(void)
 192 {
 193         struct m147lance_private *lp = dev_mvme147_lance->priv;
 194         unregister_netdev(dev_mvme147_lance);
 195         free_pages(lp->ram, 3);
 196         free_netdev(dev_mvme147_lance);
 197 }
 198
 199 #endif /* MODULE */