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/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/dio.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/skbuff.h>
  25
  26 #include <asm/system.h>
  27 #include <asm/io.h>
  28 #include <asm/pgtable.h>
  29
  30 #include "hplance.h"
  31
  32 /* We have 16834 bytes of RAM for the init block and buffers. This places
  33  * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
  34  * buffers and 2 Tx buffers.
  35  */
  36 #define LANCE_LOG_TX_BUFFERS 1
  37 #define LANCE_LOG_RX_BUFFERS 3
  38
  39 #include "7990.h"                                 /* use generic LANCE code */
  40
  41 /* Our private data structure */
  42 struct hplance_private {
  43   struct lance_private lance;
  44   unsigned int scode;
  45   void *base;
  46 };
  47
  48 /* function prototypes... This is easy because all the grot is in the
  49  * generic LANCE support. All we have to support is probing for boards,
  50  * plus board-specific init, open and close actions.
  51  * Oh, and we need to tell the generic code how to read and write LANCE registers...
  52  */
  53 static void hplance_init(struct net_device *dev, int scode);
  54 static int hplance_open(struct net_device *dev);
  55 static int hplance_close(struct net_device *dev);
  56 static void hplance_writerap(void *priv, unsigned short value);
  57 static void hplance_writerdp(void *priv, unsigned short value);
  58 static unsigned short hplance_readrdp(void *priv);
  59
  60 #ifdef MODULE
  61 static struct hplance_private *root_hplance_dev;
  62 #endif
  63
  64 static void cleanup_card(struct net_device *dev)
  65 {
  66         struct hplance_private *lp = netdev_priv(dev);
  67         dio_unconfig_board(lp->scode);
  68 }
  69
  70 /* Find all the HP Lance boards and initialise them... */
  71 struct net_device * __init hplance_probe(int unit)
  72 {
  73         struct net_device *dev;
  74
  75         if (!MACH_IS_HP300)
  76                 return ERR_PTR(-ENODEV);
  77
  78         dev = alloc_etherdev(sizeof(struct hplance_private));
  79         if (!dev)
  80                 return ERR_PTR(-ENOMEM);
  81
  82         if (unit >= 0) {
  83                 sprintf(dev->name, "eth%d", unit);
  84                 netdev_boot_setup_check(dev);
  85         }
  86
  87         SET_MODULE_OWNER(dev);
  88
  89         /* Isn't DIO nice? */
  90         for(;;)
  91         {
  92                 int scode = dio_find(DIO_ID_LAN);
  93
  94                 if (!scode)
  95                         break;
  96
  97                 dio_config_board(scode);
  98                 hplance_init(dev, scode);
  99                 if (!register_netdev(dev)) {
 100                         struct hplance_private *lp = netdev_priv(dev);
 101                         lp->next_module = root_hplance_dev;
 102                         root_hplance_dev = lp;
 103                         return dev;
 104                 }
 105                 cleanup_card(dev);
 106         }
 107         free_netdev(dev);
 108         return ERR_PTR(-ENODEV);
 109 }
 110
 111 /* Initialise a single lance board at the given select code */
 112 static void __init hplance_init(struct net_device *dev, int scode)
 113 {
 114         const char *name = dio_scodetoname(scode);
 115         void *va = dio_scodetoviraddr(scode);
 116         struct hplance_private *lp;
 117         int i;
 118
 119         printk("%s: %s; select code %d, addr", dev->name, name, scode);
 120
 121         /* reset the board */
 122         out_8(va+DIO_IDOFF, 0xff);
 123         udelay(100);                              /* ariba! ariba! udelay! udelay! */
 124
 125         /* Fill the dev fields */
 126         dev->base_addr = (unsigned long)va;
 127         dev->open = &hplance_open;
 128         dev->stop = &hplance_close;
 129         dev->hard_start_xmit = &lance_start_xmit;
 130         dev->get_stats = &lance_get_stats;
 131         dev->set_multicast_list = &lance_set_multicast;
 132         dev->dma = 0;
 133
 134         for (i=0; i<6; i++)
 135         {
 136                 /* The NVRAM holds our ethernet address, one nibble per byte,
 137                  * at bytes NVRAMOFF+1,3,5,7,9...
 138                  */
 139                 dev->dev_addr[i] = ((in_8(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
 140                         | (in_8(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
 141                 printk("%c%2.2x", i == 0 ? ' ' : ':', dev->dev_addr[i]);
 142         }
 143
 144         lp = netdev_priv(dev);
 145         lp->lance.name = (char*)name;                   /* discards const, shut up gcc */
 146         lp->lance.ll = (struct lance_regs *)(va + HPLANCE_REGOFF);
 147         lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
 148         lp->lance.lance_init_block = 0;                 /* LANCE addr of same RAM */
 149         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 150         lp->lance.irq = dio_scodetoipl(scode);
 151         lp->lance.writerap = hplance_writerap;
 152         lp->lance.writerdp = hplance_writerdp;
 153         lp->lance.readrdp = hplance_readrdp;
 154         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 155         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 156         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 157         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 158         lp->scode = scode;
 159         lp->base = va;
 160         printk(", irq %d\n", lp->lance.irq);
 161 }
 162
 163 /* This is disgusting. We have to check the DIO status register for ack every
 164  * time we read or write the LANCE registers.
 165  */
 166 static void hplance_writerap(void *priv, unsigned short value)
 167 {
 168         struct hplance_private *lp = (struct hplance_private *)priv;
 169         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 170         do {
 171                 lp->lance.ll->rap = value;
 172         } while ((hpregs->status & LE_ACK) == 0);
 173 }
 174
 175 static void hplance_writerdp(void *priv, unsigned short value)
 176 {
 177         struct hplance_private *lp = (struct hplance_private *)priv;
 178         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 179         do {
 180                 lp->lance.ll->rdp = value;
 181         } while ((hpregs->status & LE_ACK) == 0);
 182 }
 183
 184 static unsigned short hplance_readrdp(void *priv)
 185 {
 186         unsigned short val;
 187         struct hplance_private *lp = (struct hplance_private *)priv;
 188         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 189         do {
 190                 val = lp->lance.ll->rdp;
 191         } while ((hpregs->status & LE_ACK) == 0);
 192         return val;
 193 }
 194
 195 static int hplance_open(struct net_device *dev)
 196 {
 197         int status;
 198         struct hplance_private *lp = netdev_priv(dev);
 199         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 200
 201         status = lance_open(dev);                 /* call generic lance open code */
 202         if (status)
 203                 return status;
 204         /* enable interrupts at board level. */
 205         out_8(&(hpregs->status), LE_IE);
 206
 207         return 0;
 208 }
 209
 210 static int hplance_close(struct net_device *dev)
 211 {
 212         struct hplance_private *lp = netdev_priv(dev);
 213         struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
 214         out_8(&(hpregs->status), 8);              /* disable interrupts at boardlevel */
 215         lance_close(dev);
 216         return 0;
 217 }
 218
 219 #ifdef MODULE
 220 MODULE_LICENSE("GPL");
 221 int init_module(void)
 222 {
 223         int found = 0;
 224         while (!IS_ERR(hplance_probe(-1)))
 225                 found++;
 226         return found ? 0 : -ENODEV;
 227 }
 228
 229 void cleanup_module(void)
 230 {
 231         /* Walk the chain of devices, unregistering them */
 232         struct hplance_private *lp;
 233         while (root_hplance_dev) {
 234                 lp = root_hplance_dev->next_module;
 235                 unregister_netdev(root_lance_dev->dev);
 236                 cleanup_card(root_lance_dev->dev);
 237                 free_netdev(root_lance_dev->dev);
 238                 root_lance_dev = lp;
 239         }
 240 }
 241
 242 #endif /* MODULE */