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 /* Find all the HP Lance boards and initialise them... */
  75 static int __devinit hplance_init_one(struct dio_dev *d,
  76                                 const struct dio_device_id *ent)
  77 {
  78         struct net_device *dev;
  79         int err = -ENOMEM;
  80
  81         dev = alloc_etherdev(sizeof(struct hplance_private));
  82         if (!dev)
  83                 goto out;
  84
  85         err = -EBUSY;
  86         if (!request_mem_region(dio_resource_start(d),
  87                                 dio_resource_len(d), d->name))
  88                 goto out_free_netdev;
  89
  90         hplance_init(dev, d);
  91         err = register_netdev(dev);
  92         if (err)
  93                 goto out_release_mem_region;
  94
  95         dio_set_drvdata(d, dev);
  96         return 0;
  97
  98  out_release_mem_region:
  99         release_mem_region(dio_resource_start(d), dio_resource_len(d));
 100  out_free_netdev:
 101         free_netdev(dev);
 102  out:
 103         return err;
 104 }
 105
 106 static void __devexit hplance_remove_one(struct dio_dev *d)
 107 {
 108         struct net_device *dev = dio_get_drvdata(d);
 109
 110         unregister_netdev(dev);
 111         release_mem_region(dio_resource_start(d), dio_resource_len(d));
 112         free_netdev(dev);
 113 }
 114
 115 /* Initialise a single lance board at the given DIO device */
 116 static void __init hplance_init(struct net_device *dev, struct dio_dev *d)
 117 {
 118         unsigned long va = (d->resource.start + DIO_VIRADDRBASE);
 119         struct hplance_private *lp;
 120         int i;
 121
 122         printk(KERN_INFO "%s: %s; select code %d, addr", dev->name, d->name, d->scode);
 123
 124         /* reset the board */
 125         out_8(va+DIO_IDOFF, 0xff);
 126         udelay(100);                              /* ariba! ariba! udelay! udelay! */
 127
 128         /* Fill the dev fields */
 129         dev->base_addr = va;
 130         dev->open = &hplance_open;
 131         dev->stop = &hplance_close;
 132 #ifdef CONFIG_NET_POLL_CONTROLLER
 133         dev->poll_controller = lance_poll;
 134 #endif
 135         dev->hard_start_xmit = &lance_start_xmit;
 136         dev->get_stats = &lance_get_stats;
 137         dev->set_multicast_list = &lance_set_multicast;
 138         dev->dma = 0;
 139
 140         for (i=0; i<6; i++) {
 141                 /* The NVRAM holds our ethernet address, one nibble per byte,
 142                  * at bytes NVRAMOFF+1,3,5,7,9...
 143                  */
 144                 dev->dev_addr[i] = ((in_8(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
 145                         | (in_8(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
 146                 printk("%c%2.2x", i == 0 ? ' ' : ':', dev->dev_addr[i]);
 147         }
 148
 149         lp = netdev_priv(dev);
 150         lp->lance.name = (char*)d->name;                /* discards const, shut up gcc */
 151         lp->lance.base = va;
 152         lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
 153         lp->lance.lance_init_block = NULL;              /* LANCE addr of same RAM */
 154         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 155         lp->lance.irq = d->ipl;
 156         lp->lance.writerap = hplance_writerap;
 157         lp->lance.writerdp = hplance_writerdp;
 158         lp->lance.readrdp = hplance_readrdp;
 159         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 160         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 161         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 162         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 163         printk(", irq %d\n", lp->lance.irq);
 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 int __init hplance_init_module(void)
 219 {
 220         return dio_register_driver(&hplance_driver);
 221 }
 222
 223 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");