drivers/net/lasi_82596.c

   1 /* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
   2    munged into HPPA boxen .
   3
   4    This driver is based upon 82596.c, original credits are below...
   5    but there were too many hoops which HP wants jumped through to
   6    keep this code in there in a sane manner.
   7
   8    3 primary sources of the mess --
   9    1) hppa needs *lots* of cacheline flushing to keep this kind of
  10    MMIO running.
  11
  12    2) The 82596 needs to see all of its pointers as their physical
  13    address.  Thus virt_to_bus/bus_to_virt are *everywhere*.
  14
  15    3) The implementation HP is using seems to be significantly pickier
  16    about when and how the command and RX units are started.  some
  17    command ordering was changed.
  18
  19    Examination of the mach driver leads one to believe that there
  20    might be a saner way to pull this off...  anyone who feels like a
  21    full rewrite can be my guest.
  22
  23    Split 02/13/2000 Sam Creasey (sammy@oh.verio.com)
  24
  25    02/01/2000  Initial modifications for parisc by Helge Deller (deller@gmx.de)
  26    03/02/2000  changes for better/correct(?) cache-flushing (deller)
  27 */
  28
  29 /* 82596.c: A generic 82596 ethernet driver for linux. */
  30 /*
  31    Based on Apricot.c
  32    Written 1994 by Mark Evans.
  33    This driver is for the Apricot 82596 bus-master interface
  34
  35    Modularised 12/94 Mark Evans
  36
  37
  38    Modified to support the 82596 ethernet chips on 680x0 VME boards.
  39    by Richard Hirst <richard@sleepie.demon.co.uk>
  40    Renamed to be 82596.c
  41
  42    980825:  Changed to receive directly in to sk_buffs which are
  43    allocated at open() time.  Eliminates copy on incoming frames
  44    (small ones are still copied).  Shared data now held in a
  45    non-cached page, so we can run on 68060 in copyback mode.
  46
  47    TBD:
  48    * look at deferring rx frames rather than discarding (as per tulip)
  49    * handle tx ring full as per tulip
  50    * performace test to tune rx_copybreak
  51
  52    Most of my modifications relate to the braindead big-endian
  53    implementation by Intel.  When the i596 is operating in
  54    'big-endian' mode, it thinks a 32 bit value of 0x12345678
  55    should be stored as 0x56781234.  This is a real pain, when
  56    you have linked lists which are shared by the 680x0 and the
  57    i596.
  58
  59    Driver skeleton
  60    Written 1993 by Donald Becker.
  61    Copyright 1993 United States Government as represented by the Director,
  62    National Security Agency. This software may only be used and distributed
  63    according to the terms of the GNU General Public License as modified by SRC,
  64    incorporated herein by reference.
  65
  66    The author may be reached as becker@scyld.com, or C/O
  67    Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403
  68
  69  */
  70
  71 #include <linux/module.h>
  72 #include <linux/kernel.h>
  73 #include <linux/string.h>
  74 #include <linux/ptrace.h>
  75 #include <linux/errno.h>
  76 #include <linux/ioport.h>
  77 #include <linux/slab.h>
  78 #include <linux/interrupt.h>
  79 #include <linux/delay.h>
  80 #include <linux/netdevice.h>
  81 #include <linux/etherdevice.h>
  82 #include <linux/skbuff.h>
  83 #include <linux/init.h>
  84 #include <linux/types.h>
  85 #include <linux/bitops.h>
  86 #include <linux/dma-mapping.h>
  87
  88 #include <asm/io.h>
  89 #include <asm/irq.h>
  90 #include <asm/pdc.h>
  91 #include <asm/parisc-device.h>
  92
  93 #define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
  94
  95 #define PA_I82596_RESET         0       /* Offsets relative to LASI-LAN-Addr.*/
  96 #define PA_CPU_PORT_L_ACCESS    4
  97 #define PA_CHANNEL_ATTENTION    8
  98
  99 #define OPT_SWAP_PORT   0x0001  /* Need to wordswp on the MPU port */
 100
 101 #define DMA_ALLOC                        dma_alloc_noncoherent
 102 #define DMA_FREE                         dma_free_noncoherent
 103 #define DMA_WBACK(ndev, addr, len) \
 104         do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_TO_DEVICE); } while (0)
 105
 106 #define DMA_INV(ndev, addr, len) \
 107         do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0)
 108
 109 #define DMA_WBACK_INV(ndev, addr, len) \
 110         do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0)
 111
 112 #define SYSBUS      0x0000006c;
 113
 114 /* big endian CPU, 82596 "big" endian mode */
 115 #define SWAP32(x)   (((u32)(x)<<16) | ((((u32)(x)))>>16))
 116 #define SWAP16(x)   (x)
 117
 118 #include "lib82596.c"
 119
 120 MODULE_AUTHOR("Richard Hirst");
 121 MODULE_DESCRIPTION("i82596 driver");
 122 MODULE_LICENSE("GPL");
 123 module_param(i596_debug, int, 0);
 124 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
 125
 126 static inline void ca(struct net_device *dev)
 127 {
 128         gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
 129 }
 130
 131
 132 static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
 133 {
 134         struct i596_private *lp = netdev_priv(dev);
 135
 136         u32 v = (u32) (c) | (u32) (x);
 137         u16 a, b;
 138
 139         if (lp->options & OPT_SWAP_PORT) {
 140                 a = v >> 16;
 141                 b = v & 0xffff;
 142         } else {
 143                 a = v & 0xffff;
 144                 b = v >> 16;
 145         }
 146
 147         gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
 148         udelay(1);
 149         gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
 150 }
 151
 152 #define LAN_PROM_ADDR   0xF0810000
 153
 154 static int __devinit
 155 lan_init_chip(struct parisc_device *dev)
 156 {
 157         struct  net_device *netdevice;
 158         struct i596_private *lp;
 159         int     retval;
 160         int i;
 161
 162         if (!dev->irq) {
 163                 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
 164                         __FILE__, (unsigned long)dev->hpa.start);
 165                 return -ENODEV;
 166         }
 167
 168         printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n",
 169                         (unsigned long)dev->hpa.start, dev->irq);
 170
 171         netdevice = alloc_etherdev(sizeof(struct i596_private));
 172         if (!netdevice)
 173                 return -ENOMEM;
 174         SET_NETDEV_DEV(netdevice, &dev->dev);
 175         parisc_set_drvdata (dev, netdevice);
 176
 177         netdevice->base_addr = dev->hpa.start;
 178         netdevice->irq = dev->irq;
 179
 180         if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) {
 181                 for (i = 0; i < 6; i++) {
 182                         netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
 183                 }
 184                 printk(KERN_INFO
 185                        "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
 186         }
 187
 188         lp = netdev_priv(netdevice);
 189         lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
 190
 191         retval = i82596_probe(netdevice);
 192         if (retval) {
 193                 free_netdev(netdevice);
 194                 return -ENODEV;
 195         }
 196         return retval;
 197 }
 198
 199 static int __devexit lan_remove_chip (struct parisc_device *pdev)
 200 {
 201         struct net_device *dev = parisc_get_drvdata(pdev);
 202         struct i596_private *lp = netdev_priv(dev);
 203
 204         unregister_netdev (dev);
 205         DMA_FREE(&pdev->dev, sizeof(struct i596_private),
 206                  (void *)lp->dma, lp->dma_addr);
 207         free_netdev (dev);
 208         return 0;
 209 }
 210
 211 static struct parisc_device_id lan_tbl[] = {
 212         { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
 213         { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
 214         { 0, }
 215 };
 216
 217 MODULE_DEVICE_TABLE(parisc, lan_tbl);
 218
 219 static struct parisc_driver lan_driver = {
 220         .name           = "lasi_82596",
 221         .id_table       = lan_tbl,
 222         .probe          = lan_init_chip,
 223         .remove         = __devexit_p(lan_remove_chip),
 224 };
 225
 226 static int __devinit lasi_82596_init(void)
 227 {
 228         printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
 229         return register_parisc_driver(&lan_driver);
 230 }
 231
 232 module_init(lasi_82596_init);
 233
 234 static void __exit lasi_82596_exit(void)
 235 {
 236         unregister_parisc_driver(&lan_driver);
 237 }
 238
 239 module_exit(lasi_82596_exit);