drivers/net/ethernet/amd/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/io.h>
  26 #include <asm/pgtable.h>
  27
  28 #include "hplance.h"
  29
  30 /* We have 16392 bytes of RAM for the init block and buffers. This places
  31  * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
  32  * buffers and 2 Tx buffers, it takes (8 + 2) * 1544 bytes.
  33  */
  34 #define LANCE_LOG_TX_BUFFERS 1
  35 #define LANCE_LOG_RX_BUFFERS 3
  36
  37 #include "7990.h"                                 /* use generic LANCE code */
  38
  39 /* Our private data structure */
  40 struct hplance_private {
  41         struct lance_private lance;
  42 };
  43
  44 /* function prototypes... This is easy because all the grot is in the
  45  * generic LANCE support. All we have to support is probing for boards,
  46  * plus board-specific init, open and close actions.
  47  * Oh, and we need to tell the generic code how to read and write LANCE registers...
  48  */
  49 static int hplance_init_one(struct dio_dev *d, const struct dio_device_id *ent);
  50 static void hplance_init(struct net_device *dev, struct dio_dev *d);
  51 static void hplance_remove_one(struct dio_dev *d);
  52 static void hplance_writerap(void *priv, unsigned short value);
  53 static void hplance_writerdp(void *priv, unsigned short value);
  54 static unsigned short hplance_readrdp(void *priv);
  55 static int hplance_open(struct net_device *dev);
  56 static int hplance_close(struct net_device *dev);
  57
  58 static struct dio_device_id hplance_dio_tbl[] = {
  59         { DIO_ID_LAN },
  60         { 0 }
  61 };
  62
  63 static struct dio_driver hplance_driver = {
  64         .name      = "hplance",
  65         .id_table  = hplance_dio_tbl,
  66         .probe     = hplance_init_one,
  67         .remove    = hplance_remove_one,
  68 };
  69
  70 static const struct net_device_ops hplance_netdev_ops = {
  71         .ndo_open               = hplance_open,
  72         .ndo_stop               = hplance_close,
  73         .ndo_start_xmit         = lance_start_xmit,
  74         .ndo_set_rx_mode        = lance_set_multicast,
  75         .ndo_validate_addr      = eth_validate_addr,
  76         .ndo_set_mac_address    = eth_mac_addr,
  77 #ifdef CONFIG_NET_POLL_CONTROLLER
  78         .ndo_poll_controller    = lance_poll,
  79 #endif
  80 };
  81
  82 /* Find all the HP Lance boards and initialise them... */
  83 static int hplance_init_one(struct dio_dev *d, const struct dio_device_id *ent)
  84 {
  85         struct net_device *dev;
  86         int err = -ENOMEM;
  87
  88         dev = alloc_etherdev(sizeof(struct hplance_private));
  89         if (!dev)
  90                 goto out;
  91
  92         err = -EBUSY;
  93         if (!request_mem_region(dio_resource_start(d),
  94                                 dio_resource_len(d), d->name))
  95                 goto out_free_netdev;
  96
  97         hplance_init(dev, d);
  98         err = register_netdev(dev);
  99         if (err)
 100                 goto out_release_mem_region;
 101
 102         dio_set_drvdata(d, dev);
 103
 104         printk(KERN_INFO "%s: %s; select code %d, addr %pM, irq %d\n",
 105                dev->name, d->name, d->scode, dev->dev_addr, d->ipl);
 106
 107         return 0;
 108
 109  out_release_mem_region:
 110         release_mem_region(dio_resource_start(d), dio_resource_len(d));
 111  out_free_netdev:
 112         free_netdev(dev);
 113  out:
 114         return err;
 115 }
 116
 117 static void hplance_remove_one(struct dio_dev *d)
 118 {
 119         struct net_device *dev = dio_get_drvdata(d);
 120
 121         unregister_netdev(dev);
 122         release_mem_region(dio_resource_start(d), dio_resource_len(d));
 123         free_netdev(dev);
 124 }
 125
 126 /* Initialise a single lance board at the given DIO device */
 127 static void hplance_init(struct net_device *dev, struct dio_dev *d)
 128 {
 129         unsigned long va = (d->resource.start + DIO_VIRADDRBASE);
 130         struct hplance_private *lp;
 131         int i;
 132
 133         /* reset the board */
 134         out_8(va + DIO_IDOFF, 0xff);
 135         udelay(100);                              /* ariba! ariba! udelay! udelay! */
 136
 137         /* Fill the dev fields */
 138         dev->base_addr = va;
 139         dev->netdev_ops = &hplance_netdev_ops;
 140         dev->dma = 0;
 141
 142         for (i = 0; i < 6; i++) {
 143                 /* The NVRAM holds our ethernet address, one nibble per byte,
 144                  * at bytes NVRAMOFF+1,3,5,7,9...
 145                  */
 146                 dev->dev_addr[i] = ((in_8(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
 147                         | (in_8(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
 148         }
 149
 150         lp = netdev_priv(dev);
 151         lp->lance.name = d->name;
 152         lp->lance.base = va;
 153         lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
 154         lp->lance.lance_init_block = NULL;              /* LANCE addr of same RAM */
 155         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 156         lp->lance.irq = d->ipl;
 157         lp->lance.writerap = hplance_writerap;
 158         lp->lance.writerdp = hplance_writerdp;
 159         lp->lance.readrdp = hplance_readrdp;
 160         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 161         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 162         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 163         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 164 }
 165
 166 /* This is disgusting. We have to check the DIO status register for ack every
 167  * time we read or write the LANCE registers.
 168  */
 169 static void hplance_writerap(void *priv, unsigned short value)
 170 {
 171         struct lance_private *lp = (struct lance_private *)priv;
 172         do {
 173                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
 174         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 175 }
 176
 177 static void hplance_writerdp(void *priv, unsigned short value)
 178 {
 179         struct lance_private *lp = (struct lance_private *)priv;
 180         do {
 181                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
 182         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 183 }
 184
 185 static unsigned short hplance_readrdp(void *priv)
 186 {
 187         struct lance_private *lp = (struct lance_private *)priv;
 188         __u16 value;
 189         do {
 190                 value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
 191         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
 192         return value;
 193 }
 194
 195 static int hplance_open(struct net_device *dev)
 196 {
 197         int status;
 198         struct lance_private *lp = netdev_priv(dev);
 199
 200         status = lance_open(dev);                 /* call generic lance open code */
 201         if (status)
 202                 return status;
 203         /* enable interrupts at board level. */
 204         out_8(lp->base + HPLANCE_STATUS, LE_IE);
 205
 206         return 0;
 207 }
 208
 209 static int hplance_close(struct net_device *dev)
 210 {
 211         struct lance_private *lp = netdev_priv(dev);
 212
 213         out_8(lp->base + HPLANCE_STATUS, 0);    /* disable interrupts at boardlevel */
 214         lance_close(dev);
 215         return 0;
 216 }
 217
 218 static int __init hplance_init_module(void)
 219 {
 220         return dio_register_driver(&hplance_driver);
 221 }
 222
 223 static void __exit hplance_cleanup_module(void)
 224 {
 225         dio_unregister_driver(&hplance_driver);
 226 }
 227
 228 module_init(hplance_init_module);
 229 module_exit(hplance_cleanup_module);
 230
 231 MODULE_LICENSE("GPL");