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