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 };
  45
  46 /* function prototypes... This is easy because all the grot is in the
  47  * generic LANCE support. All we have to support is probing for boards,
  48  * plus board-specific init, open and close actions.
  49  * Oh, and we need to tell the generic code how to read and write LANCE registers...
  50  */
  51 static int __devinit hplance_init_one(struct dio_dev *d,
  52                                 const struct dio_device_id *ent);
  53 static void __devinit hplance_init(struct net_device *dev,
  54                                 struct dio_dev *d);
  55 static void __devexit hplance_remove_one(struct dio_dev *d);
  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 static int hplance_open(struct net_device *dev);
  60 static int hplance_close(struct net_device *dev);
  61
  62 static struct dio_device_id hplance_dio_tbl[] = {
  63         { DIO_ID_LAN },
  64         { 0 }
  65 };
  66
  67 static struct dio_driver hplance_driver = {
  68         .name      = "hplance",
  69         .id_table  = hplance_dio_tbl,
  70         .probe     = hplance_init_one,
  71         .remove    = __devexit_p(hplance_remove_one),
  72 };
  73
  74 static const struct net_device_ops hplance_netdev_ops = {
  75         .ndo_open               = hplance_open,
  76         .ndo_stop               = hplance_close,
  77         .ndo_start_xmit         = lance_start_xmit,
  78         .ndo_set_multicast_list = lance_set_multicast,
  79         .ndo_change_mtu         = eth_change_mtu,
  80         .ndo_validate_addr      = eth_validate_addr,
  81         .ndo_set_mac_address    = eth_mac_addr,
  82 #ifdef CONFIG_NET_POLL_CONTROLLER
  83         .ndo_poll_controller    = lance_poll,
  84 #endif
  85 };
  86
  87 /* Find all the HP Lance boards and initialise them... */
  88 static int __devinit hplance_init_one(struct dio_dev *d,
  89                                 const struct dio_device_id *ent)
  90 {
  91         struct net_device *dev;
  92         int err = -ENOMEM;
  93         int i;
  94
  95         dev = alloc_etherdev(sizeof(struct hplance_private));
  96         if (!dev)
  97                 goto out;
  98
  99         err = -EBUSY;
 100         if (!request_mem_region(dio_resource_start(d),
 101                                 dio_resource_len(d), d->name))
 102                 goto out_free_netdev;
 103
 104         hplance_init(dev, d);
 105         err = register_netdev(dev);
 106         if (err)
 107                 goto out_release_mem_region;
 108
 109         dio_set_drvdata(d, dev);
 110
 111         printk(KERN_INFO "%s: %s; select code %d, addr %2.2x", dev->name, d->name, d->scode, dev->dev_addr[0]);
 112
 113         for (i=1; i<6; i++) {
 114                 printk(":%2.2x", dev->dev_addr[i]);
 115         }
 116
 117         printk(", irq %d\n", d->ipl);
 118
 119         return 0;
 120
 121  out_release_mem_region:
 122         release_mem_region(dio_resource_start(d), dio_resource_len(d));
 123  out_free_netdev:
 124         free_netdev(dev);
 125  out:
 126         return err;
 127 }
 128
 129 static void __devexit hplance_remove_one(struct dio_dev *d)
 130 {
 131         struct net_device *dev = dio_get_drvdata(d);
 132
 133         unregister_netdev(dev);
 134         release_mem_region(dio_resource_start(d), dio_resource_len(d));
 135         free_netdev(dev);
 136 }
 137
 138 /* Initialise a single lance board at the given DIO device */
 139 static void __init hplance_init(struct net_device *dev, struct dio_dev *d)
 140 {
 141         unsigned long va = (d->resource.start + DIO_VIRADDRBASE);
 142         struct hplance_private *lp;
 143         int i;
 144
 145         /* reset the board */
 146         out_8(va+DIO_IDOFF, 0xff);
 147         udelay(100);                              /* ariba! ariba! udelay! udelay! */
 148
 149         /* Fill the dev fields */
 150         dev->base_addr = va;
 151         dev->netdev_ops = &hplance_netdev_ops;
 152         dev->dma = 0;
 153
 154         for (i=0; i<6; i++) {
 155                 /* The NVRAM holds our ethernet address, one nibble per byte,
 156                  * at bytes NVRAMOFF+1,3,5,7,9...
 157                  */
 158                 dev->dev_addr[i] = ((in_8(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
 159                         | (in_8(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
 160         }
 161
 162         lp = netdev_priv(dev);
 163         lp->lance.name = (char*)d->name;                /* discards const, shut up gcc */
 164         lp->lance.base = va;
 165         lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
 166         lp->lance.lance_init_block = NULL;              /* LANCE addr of same RAM */
 167         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 168         lp->lance.irq = d->ipl;
 169         lp->lance.writerap = hplance_writerap;
 170         lp->lance.writerdp = hplance_writerdp;
 171         lp->lance.readrdp = hplance_readrdp;
 172         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 173         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 174         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 175         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 176 }
 177
 178 /* This is disgusting. We have to check the DIO status register for ack every
 179  * time we read or write the LANCE registers.
 180  */
 181 static void hplance_writerap(void *priv, unsigned short value)
 182 {
 183         struct lance_private *lp = (struct lance_private *)priv;
 184         do {
 185                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
 186         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 187 }
 188
 189 static void hplance_writerdp(void *priv, unsigned short value)
 190 {
 191         struct lance_private *lp = (struct lance_private *)priv;
 192         do {
 193                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
 194         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 195 }
 196
 197 static unsigned short hplance_readrdp(void *priv)
 198 {
 199         struct lance_private *lp = (struct lance_private *)priv;
 200         __u16 value;
 201         do {
 202                 value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
 203         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 204         return value;
 205 }
 206
 207 static int hplance_open(struct net_device *dev)
 208 {
 209         int status;
 210         struct lance_private *lp = netdev_priv(dev);
 211
 212         status = lance_open(dev);                 /* call generic lance open code */
 213         if (status)
 214                 return status;
 215         /* enable interrupts at board level. */
 216         out_8(lp->base + HPLANCE_STATUS, LE_IE);
 217
 218         return 0;
 219 }
 220
 221 static int hplance_close(struct net_device *dev)
 222 {
 223         struct lance_private *lp = netdev_priv(dev);
 224
 225         out_8(lp->base + HPLANCE_STATUS, 0);    /* disable interrupts at boardlevel */
 226         lance_close(dev);
 227         return 0;
 228 }
 229
 230 static int __init hplance_init_module(void)
 231 {
 232         return dio_register_driver(&hplance_driver);
 233 }
 234
 235 static void __exit hplance_cleanup_module(void)
 236 {
 237         dio_unregister_driver(&hplance_driver);
 238 }
 239
 240 module_init(hplance_init_module);
 241 module_exit(hplance_cleanup_module);
 242
 243 MODULE_LICENSE("GPL");