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/string.h>
  14 #include <linux/delay.h>
  15 #include <linux/init.h>
  16 #include <linux/errno.h>
  17 /* Used for the temporal inet entries and routing */
  18 #include <linux/socket.h>
  19 #include <linux/route.h>
  20 #include <linux/dio.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
  29 #include "hplance.h"
  30
  31 /* We have 16834 bytes of RAM for the init block and buffers. This places
  32  * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
  33  * buffers and 2 Tx buffers.
  34  */
  35 #define LANCE_LOG_TX_BUFFERS 1
  36 #define LANCE_LOG_RX_BUFFERS 3
  37
  38 #include "7990.h"                                 /* use generic LANCE code */
  39
  40 /* Our private data structure */
  41 struct hplance_private {
  42         struct lance_private lance;
  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 __devinit hplance_init_one(struct dio_dev *d,
  51                                 const struct dio_device_id *ent);
  52 static void __devinit hplance_init(struct net_device *dev,
  53                                 struct dio_dev *d);
  54 static void __devexit hplance_remove_one(struct dio_dev *d);
  55 static void hplance_writerap(void *priv, unsigned short value);
  56 static void hplance_writerdp(void *priv, unsigned short value);
  57 static unsigned short hplance_readrdp(void *priv);
  58 static int hplance_open(struct net_device *dev);
  59 static int hplance_close(struct net_device *dev);
  60
  61 static struct dio_device_id hplance_dio_tbl[] = {
  62         { DIO_ID_LAN },
  63         { 0 }
  64 };
  65
  66 static struct dio_driver hplance_driver = {
  67         .name      = "hplance",
  68         .id_table  = hplance_dio_tbl,
  69         .probe     = hplance_init_one,
  70         .remove    = __devexit_p(hplance_remove_one),
  71 };
  72
  73 static const struct net_device_ops hplance_netdev_ops = {
  74         .ndo_open               = hplance_open,
  75         .ndo_stop               = hplance_close,
  76         .ndo_start_xmit         = lance_start_xmit,
  77         .ndo_set_multicast_list = lance_set_multicast,
  78         .ndo_change_mtu         = eth_change_mtu,
  79         .ndo_validate_addr      = eth_validate_addr,
  80         .ndo_set_mac_address    = eth_mac_addr,
  81 #ifdef CONFIG_NET_POLL_CONTROLLER
  82         .ndo_poll_controller    = lance_poll,
  83 #endif
  84 };
  85
  86 /* Find all the HP Lance boards and initialise them... */
  87 static int __devinit hplance_init_one(struct dio_dev *d,
  88                                 const struct dio_device_id *ent)
  89 {
  90         struct net_device *dev;
  91         int err = -ENOMEM;
  92         int i;
  93
  94         dev = alloc_etherdev(sizeof(struct hplance_private));
  95         if (!dev)
  96                 goto out;
  97
  98         err = -EBUSY;
  99         if (!request_mem_region(dio_resource_start(d),
 100                                 dio_resource_len(d), d->name))
 101                 goto out_free_netdev;
 102
 103         hplance_init(dev, d);
 104         err = register_netdev(dev);
 105         if (err)
 106                 goto out_release_mem_region;
 107
 108         dio_set_drvdata(d, dev);
 109
 110         printk(KERN_INFO "%s: %s; select code %d, addr %2.2x", dev->name, d->name, d->scode, dev->dev_addr[0]);
 111
 112         for (i=1; i<6; i++) {
 113                 printk(":%2.2x", dev->dev_addr[i]);
 114         }
 115
 116         printk(", irq %d\n", d->ipl);
 117
 118         return 0;
 119
 120  out_release_mem_region:
 121         release_mem_region(dio_resource_start(d), dio_resource_len(d));
 122  out_free_netdev:
 123         free_netdev(dev);
 124  out:
 125         return err;
 126 }
 127
 128 static void __devexit hplance_remove_one(struct dio_dev *d)
 129 {
 130         struct net_device *dev = dio_get_drvdata(d);
 131
 132         unregister_netdev(dev);
 133         release_mem_region(dio_resource_start(d), dio_resource_len(d));
 134         free_netdev(dev);
 135 }
 136
 137 /* Initialise a single lance board at the given DIO device */
 138 static void __init hplance_init(struct net_device *dev, struct dio_dev *d)
 139 {
 140         unsigned long va = (d->resource.start + DIO_VIRADDRBASE);
 141         struct hplance_private *lp;
 142         int i;
 143
 144         /* reset the board */
 145         out_8(va+DIO_IDOFF, 0xff);
 146         udelay(100);                              /* ariba! ariba! udelay! udelay! */
 147
 148         /* Fill the dev fields */
 149         dev->base_addr = va;
 150         dev->netdev_ops = &hplance_netdev_ops;
 151         dev->dma = 0;
 152
 153         for (i=0; i<6; i++) {
 154                 /* The NVRAM holds our ethernet address, one nibble per byte,
 155                  * at bytes NVRAMOFF+1,3,5,7,9...
 156                  */
 157                 dev->dev_addr[i] = ((in_8(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
 158                         | (in_8(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
 159         }
 160
 161         lp = netdev_priv(dev);
 162         lp->lance.name = (char*)d->name;                /* discards const, shut up gcc */
 163         lp->lance.base = va;
 164         lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
 165         lp->lance.lance_init_block = NULL;              /* LANCE addr of same RAM */
 166         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 167         lp->lance.irq = d->ipl;
 168         lp->lance.writerap = hplance_writerap;
 169         lp->lance.writerdp = hplance_writerdp;
 170         lp->lance.readrdp = hplance_readrdp;
 171         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 172         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 173         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 174         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 175 }
 176
 177 /* This is disgusting. We have to check the DIO status register for ack every
 178  * time we read or write the LANCE registers.
 179  */
 180 static void hplance_writerap(void *priv, unsigned short value)
 181 {
 182         struct lance_private *lp = (struct lance_private *)priv;
 183         do {
 184                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
 185         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 186 }
 187
 188 static void hplance_writerdp(void *priv, unsigned short value)
 189 {
 190         struct lance_private *lp = (struct lance_private *)priv;
 191         do {
 192                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
 193         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 194 }
 195
 196 static unsigned short hplance_readrdp(void *priv)
 197 {
 198         struct lance_private *lp = (struct lance_private *)priv;
 199         __u16 value;
 200         do {
 201                 value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
 202         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 203         return value;
 204 }
 205
 206 static int hplance_open(struct net_device *dev)
 207 {
 208         int status;
 209         struct lance_private *lp = netdev_priv(dev);
 210
 211         status = lance_open(dev);                 /* call generic lance open code */
 212         if (status)
 213                 return status;
 214         /* enable interrupts at board level. */
 215         out_8(lp->base + HPLANCE_STATUS, LE_IE);
 216
 217         return 0;
 218 }
 219
 220 static int hplance_close(struct net_device *dev)
 221 {
 222         struct lance_private *lp = netdev_priv(dev);
 223
 224         out_8(lp->base + HPLANCE_STATUS, 0);    /* disable interrupts at boardlevel */
 225         lance_close(dev);
 226         return 0;
 227 }
 228
 229 static int __init hplance_init_module(void)
 230 {
 231         return dio_register_driver(&hplance_driver);
 232 }
 233
 234 static void __exit hplance_cleanup_module(void)
 235 {
 236         dio_unregister_driver(&hplance_driver);
 237 }
 238
 239 module_init(hplance_init_module);
 240 module_exit(hplance_cleanup_module);
 241
 242 MODULE_LICENSE("GPL");