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/sched.h>
  11 #include <linux/types.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/ptrace.h>
  14 #include <linux/ioport.h>
  15 #include <linux/malloc.h>
  16 #include <linux/string.h>
  17 #include <linux/delay.h>
  18 #include <linux/init.h>
  19 #include <linux/errno.h>
  20 #include <asm/system.h>
  21 #include <asm/io.h>
  22 #include <asm/pgtable.h>
  23
  24 /* Used for the temporal inet entries and routing */
  25 #include <linux/socket.h>
  26 #include <linux/route.h>
  27
  28 #include <linux/dio.h>
  29
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/skbuff.h>
  33
  34 #include <asm/mvme147hw.h>
  35
  36 /* We have 16834 bytes of RAM for the init block and buffers. This places
  37  * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
  38  * buffers and 2 Tx buffers.
  39  */
  40 #define LANCE_LOG_TX_BUFFERS 1
  41 #define LANCE_LOG_RX_BUFFERS 3
  42
  43 #include "7990.h"                                 /* use generic LANCE code */
  44
  45 /* Our private data structure */
  46 struct m147lance_private {
  47         struct lance_private lance;
  48         void *base;
  49         void *ram;
  50 };
  51
  52 /* function prototypes... This is easy because all the grot is in the
  53  * generic LANCE support. All we have to support is probing for boards,
  54  * plus board-specific init, open and close actions.
  55  * Oh, and we need to tell the generic code how to read and write LANCE registers...
  56  */
  57 int mvme147lance_probe(struct net_device *dev);
  58 static int m147lance_open(struct net_device *dev);
  59 static int m147lance_close(struct net_device *dev);
  60 static void m147lance_writerap(struct m147lance_private *lp, unsigned short value);
  61 static void m147lance_writerdp(struct m147lance_private *lp, unsigned short value);
  62 static unsigned short m147lance_readrdp(struct m147lance_private *lp);
  63
  64 typedef void (*writerap_t)(void *, unsigned short);
  65 typedef void (*writerdp_t)(void *, unsigned short);
  66 typedef void (*readrdp_t)(void *);
  67
  68 #ifdef MODULE
  69 static struct m147lance_private *root_m147lance_dev = NULL;
  70 #endif
  71
  72 /* Initialise the one and only on-board 7990 */
  73 int __init mvme147lance_probe(struct net_device *dev)
  74 {
  75         static int called = 0;
  76         static const char name[] = "MVME147 LANCE";
  77         struct m147lance_private *lp;
  78         u_long *addr;
  79         u_long address;
  80
  81         if (!MACH_IS_MVME147 || called)
  82                 return(ENODEV);
  83         called++;
  84
  85         dev->priv = kmalloc(sizeof(struct m147lance_private), GFP_KERNEL);
  86         if (dev->priv == NULL)
  87                 return -ENOMEM;
  88         memset(dev->priv, 0, sizeof(struct m147lance_private));
  89
  90         /* Fill the dev fields */
  91         dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
  92         dev->open = &m147lance_open;
  93         dev->stop = &m147lance_close;
  94         dev->hard_start_xmit = &lance_start_xmit;
  95         dev->get_stats = &lance_get_stats;
  96         dev->set_multicast_list = &lance_set_multicast;
  97         dev->dma = 0;
  98
  99         addr=(u_long *)ETHERNET_ADDRESS;
 100         address = *addr;
 101         dev->dev_addr[0]=0x08;
 102         dev->dev_addr[1]=0x00;
 103         dev->dev_addr[2]=0x3e;
 104         address=address>>8;
 105         dev->dev_addr[5]=address&0xff;
 106         address=address>>8;
 107         dev->dev_addr[4]=address&0xff;
 108         address=address>>8;
 109         dev->dev_addr[3]=address&0xff;
 110
 111         printk("%s: MVME147 at 0x%08lx, irq %d, Hardware Address %02x:%02x:%02x:%02x:%02x:%02x\n",
 112                 dev->name, dev->base_addr, MVME147_LANCE_IRQ,
 113                 dev->dev_addr[0],
 114                 dev->dev_addr[1], dev->dev_addr[2],
 115                 dev->dev_addr[3], dev->dev_addr[4],
 116                 dev->dev_addr[5]);
 117
 118         lp = (struct m147lance_private *)dev->priv;
 119         lp->ram = (void *)__get_dma_pages(GFP_ATOMIC, 3);       /* 16K */
 120         if (!lp->ram)
 121         {
 122                 printk("%s: No memory for LANCE buffers\n", dev->name);
 123                 return -ENODEV;
 124         }
 125
 126         lp->lance.name = (char*)name;                   /* discards const, shut up gcc */
 127         lp->lance.ll = (struct lance_regs *)(dev->base_addr);
 128         lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
 129         lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
 130         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 131         lp->lance.irq = MVME147_LANCE_IRQ;
 132         lp->lance.writerap = (writerap_t)m147lance_writerap;
 133         lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
 134         lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
 135         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 136         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 137         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 138         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 139         ether_setup(dev);
 140
 141 #ifdef MODULE
 142         dev->ifindex = dev_new_index();
 143         lp->next_module = root_m147lance_dev;
 144         root_m147lance_dev = lp;
 145 #endif /* MODULE */
 146
 147         return 0;
 148 }
 149
 150 static void m147lance_writerap(struct m147lance_private *lp, unsigned short value)
 151 {
 152         lp->lance.ll->rap = value;
 153 }
 154
 155 static void m147lance_writerdp(struct m147lance_private *lp, unsigned short value)
 156 {
 157         lp->lance.ll->rdp = value;
 158 }
 159
 160 static unsigned short m147lance_readrdp(struct m147lance_private *lp)
 161 {
 162         return lp->lance.ll->rdp;
 163 }
 164
 165 static int m147lance_open(struct net_device *dev)
 166 {
 167         int status;
 168
 169         status = lance_open(dev);                 /* call generic lance open code */
 170         if (status)
 171                 return status;
 172         /* enable interrupts at board level. */
 173         m147_pcc->lan_cntrl=0;       /* clear the interrupts (if any) */
 174         m147_pcc->lan_cntrl=0x08 | 0x04;     /* Enable irq 4 */
 175
 176         MOD_INC_USE_COUNT;
 177         return 0;
 178 }
 179
 180 static int m147lance_close(struct net_device *dev)
 181 {
 182         /* disable interrupts at boardlevel */
 183         m147_pcc->lan_cntrl=0x0; /* disable interrupts */
 184         lance_close(dev);
 185         MOD_DEC_USE_COUNT;
 186         return 0;
 187 }
 188
 189 #ifdef MODULE
 190 int init_module(void)
 191 {
 192         root_lance_dev = NULL;
 193         return mvme147lance_probe(NULL);
 194 }
 195
 196 void cleanup_module(void)
 197 {
 198         /* Walk the chain of devices, unregistering them */
 199         struct m147lance_private *lp;
 200         while (root_m147lance_dev) {
 201                 lp = root_m147lance_dev->next_module;
 202                 unregister_netdev(root_lance_dev->dev);
 203                 free_pages(lp->ram, 3);
 204                 kfree(root_lance_dev->dev);
 205                 root_lance_dev = lp;
 206         }
 207 }
 208
 209 #endif /* MODULE */