drivers/net/hplance.c

   1 /* hplance.c  : the  Linux/hp300/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 "hplance.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 hplance_private {
  47   struct lance_private lance;
  48   unsigned int scode;
  49   void *base;
  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 hplance_probe(struct net_device *dev);
  58 static int hplance_init(struct net_device *dev, int scode);
  59 static int hplance_open(struct net_device *dev);
  60 static int hplance_close(struct net_device *dev);
  61 static void hplance_writerap(struct hplance_private *lp, unsigned short value);
  62 static void hplance_writerdp(struct hplance_private *lp, unsigned short value);
  63 static unsigned short hplance_readrdp(struct hplance_private *lp);
  64
  65 #ifdef MODULE
  66 static struct hplance_private *root_hplance_dev = NULL;
  67 #endif
  68
  69 /* Find all the HP Lance boards and initialise them... */
  70 int __init hplance_probe(struct net_device *dev)
  71 {
  72         int cards = 0, called = 0;
  73
  74         if (!MACH_IS_HP300 || called)
  75                 return(ENODEV);
  76         called++;
  77
  78         /* Isn't DIO nice? */
  79         for(;;)
  80         {
  81                 int v, scode = dio_find(DIO_ID_LAN);
  82
  83                 if (!scode)
  84                         break;
  85
  86                 if(cards)
  87                         dev = NULL;      /* don't trash previous device, make a new one */
  88                 cards++;
  89
  90                 v = hplance_init(dev, scode);
  91                 if (v)                            /* error, abort immediately */
  92                         return v;
  93         }
  94         /* OK, return success, or ENODEV if we didn't find any cards */
  95         if (!cards)
  96                 return ENODEV;
  97         return 0;
  98 }
  99
 100 /* Initialise a single lance board at the given select code */
 101 static int __init hplance_init(struct net_device *dev, int scode)
 102 {
 103         /* const char *name = dio_scodetoname(scode); */
 104         static const char name[] = "HP LANCE";
 105         void *va = dio_scodetoviraddr(scode);
 106         struct hplance_private *lp;
 107         int i;
 108
 109         if (dev == NULL)
 110                 dev = init_etherdev(0, sizeof(struct hplance_private));
 111         else
 112         {
 113                 dev->priv = kmalloc(sizeof(struct hplance_private), GFP_KERNEL);
 114                 if (dev->priv == NULL)
 115                         return -ENOMEM;
 116                 memset(dev->priv, 0, sizeof(struct hplance_private));
 117         }
 118         printk("%s: HP LANCE; select code %d, addr", dev->name, scode);
 119
 120         /* reset the board */
 121         writeb(0xff,va+DIO_IDOFF);
 122         udelay(100);                              /* ariba! ariba! udelay! udelay! */
 123
 124         /* Fill the dev fields */
 125         dev->base_addr = (unsigned long)va;
 126         dev->open = &hplance_open;
 127         dev->stop = &hplance_close;
 128         dev->hard_start_xmit = &lance_start_xmit;
 129         dev->get_stats = &lance_get_stats;
 130         dev->set_multicast_list = &lance_set_multicast;
 131         dev->dma = 0;
 132
 133         for (i=0; i<6; i++)
 134         {
 135                 /* The NVRAM holds our ethernet address, one nibble per byte,
 136                  * at bytes NVRAMOFF+1,3,5,7,9...
 137                  */
 138                 dev->dev_addr[i] = ((readb(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
 139                         | (readb(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
 140                 printk("%c%2.2x", i == 0 ? ' ' : ':', dev->dev_addr[i]);
 141         }
 142
 143         lp = (struct hplance_private *)dev->priv;
 144         lp->lance.name = (char*)name;                   /* discards const, shut up gcc */
 145         lp->lance.ll = (struct lance_regs *)(va + HPLANCE_REGOFF);
 146         lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
 147         lp->lance.lance_init_block = 0;                 /* LANCE addr of same RAM */
 148         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 149         lp->lance.irq = dio_scodetoipl(scode);
 150         lp->lance.writerap = hplance_writerap;
 151         lp->lance.writerdp = hplance_writerdp;
 152         lp->lance.readrdp = hplance_readrdp;
 153         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 154         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 155         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 156         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 157         lp->scode = scode;
 158         lp->base = va;
 159         ether_setup(dev);
 160         printk(", irq %d\n", lp->lance.irq);
 161
 162 #ifdef MODULE
 163         dev->ifindex = dev_new_index();
 164         lp->next_module = root_hplance_dev;
 165         root_hplance_dev = lp;
 166 #endif /* MODULE */
 167
 168         dio_config_board(scode);                  /* tell bus scanning code this one's taken */
 169         return 0;
 170 }
 171
 172 /* This is disgusting. We have to check the DIO status register for ack every
 173  * time we read or write the LANCE registers.
 174  */
 175 static void hplance_writerap(struct hplance_private *lp, unsigned short value)
 176 {
 177         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 178         do {
 179                 lp->lance.ll->rap = value;
 180         } while ((hpregs->status & LE_ACK) == 0);
 181 }
 182
 183 static void hplance_writerdp(struct hplance_private *lp, unsigned short value)
 184 {
 185         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 186         do {
 187                 lp->lance.ll->rdp = value;
 188         } while ((hpregs->status & LE_ACK) == 0);
 189 }
 190
 191 static unsigned short hplance_readrdp(struct hplance_private *lp)
 192 {
 193         unsigned short val;
 194         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 195         do {
 196                 val = lp->lance.ll->rdp;
 197         } while ((hpregs->status & LE_ACK) == 0);
 198         return val;
 199 }
 200
 201 static int hplance_open(struct net_device *dev)
 202 {
 203         int status;
 204         struct hplance_private *lp = (struct hplance_private *)dev->priv;
 205         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 206
 207         status = lance_open(dev);                 /* call generic lance open code */
 208         if (status)
 209                 return status;
 210         /* enable interrupts at board level. */
 211         writeb(LE_IE, &(hpregs->status));
 212
 213         MOD_INC_USE_COUNT;
 214         return 0;
 215 }
 216
 217 static int hplance_close(struct net_device *dev)
 218 {
 219         struct hplance_private *lp = (struct hplance_private *)dev->priv;
 220         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 221         writeb(0,&(hpregs->status));              /* disable interrupts at boardlevel */
 222         lance_close(dev);
 223         MOD_DEC_USE_COUNT;
 224         return 0;
 225 }
 226
 227 #ifdef MODULE
 228 int init_module(void)
 229 {
 230         root_lance_dev = NULL;
 231         return hplance_probe(NULL);
 232 }
 233
 234 void cleanup_module(void)
 235 {
 236         /* Walk the chain of devices, unregistering them */
 237         struct hplance_private *lp;
 238         while (root_hplance_dev) {
 239                 lp = root_hplance_dev->next_module;
 240                 dio_unconfig_board(lp->scode);
 241                 unregister_netdev(root_lance_dev->dev);
 242                 kfree(root_lance_dev->dev);
 243                 root_lance_dev = lp;
 244         }
 245 }
 246
 247 #endif /* MODULE */