drivers/net/ethernet/i825xx/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    * performance 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/interrupt.h>
  78 #include <linux/delay.h>
  79 #include <linux/netdevice.h>
  80 #include <linux/etherdevice.h>
  81 #include <linux/skbuff.h>
  82 #include <linux/types.h>
  83 #include <linux/bitops.h>
  84 #include <linux/dma-mapping.h>
  85
  86 #include <asm/io.h>
  87 #include <asm/irq.h>
  88 #include <asm/pdc.h>
  89 #include <asm/parisc-device.h>
  90
  91 #define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
  92
  93 #define PA_I82596_RESET         0       /* Offsets relative to LASI-LAN-Addr.*/
  94 #define PA_CPU_PORT_L_ACCESS    4
  95 #define PA_CHANNEL_ATTENTION    8
  96
  97 #define OPT_SWAP_PORT   0x0001  /* Need to wordswp on the MPU port */
  98
  99 #define LIB82596_DMA_ATTR       DMA_ATTR_NON_CONSISTENT
 100
 101 #define DMA_WBACK(ndev, addr, len) \
 102         do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_TO_DEVICE); } while (0)
 103
 104 #define DMA_INV(ndev, addr, len) \
 105         do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0)
 106
 107 #define DMA_WBACK_INV(ndev, addr, len) \
 108         do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0)
 109
 110 #define SYSBUS      0x0000006c
 111
 112 /* big endian CPU, 82596 "big" endian mode */
 113 #define SWAP32(x)   (((u32)(x)<<16) | ((((u32)(x)))>>16))
 114 #define SWAP16(x)   (x)
 115
 116 #include "lib82596.c"
 117
 118 MODULE_AUTHOR("Richard Hirst");
 119 MODULE_DESCRIPTION("i82596 driver");
 120 MODULE_LICENSE("GPL");
 121 module_param(i596_debug, int, 0);
 122 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
 123
 124 static inline void ca(struct net_device *dev)
 125 {
 126         gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
 127 }
 128
 129
 130 static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
 131 {
 132         struct i596_private *lp = netdev_priv(dev);
 133
 134         u32 v = (u32) (c) | (u32) (x);
 135         u16 a, b;
 136
 137         if (lp->options & OPT_SWAP_PORT) {
 138                 a = v >> 16;
 139                 b = v & 0xffff;
 140         } else {
 141                 a = v & 0xffff;
 142                 b = v >> 16;
 143         }
 144
 145         gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
 146         if (!running_on_qemu)
 147                 udelay(1);
 148         gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
 149 }
 150
 151 #define LAN_PROM_ADDR   0xF0810000
 152
 153 static int __init
 154 lan_init_chip(struct parisc_device *dev)
 155 {
 156         struct  net_device *netdevice;
 157         struct i596_private *lp;
 158         int     retval;
 159         int i;
 160
 161         if (!dev->irq) {
 162                 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
 163                         __FILE__, (unsigned long)dev->hpa.start);
 164                 return -ENODEV;
 165         }
 166
 167         printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n",
 168                         (unsigned long)dev->hpa.start, dev->irq);
 169
 170         netdevice = alloc_etherdev(sizeof(struct i596_private));
 171         if (!netdevice)
 172                 return -ENOMEM;
 173         SET_NETDEV_DEV(netdevice, &dev->dev);
 174         parisc_set_drvdata (dev, netdevice);
 175
 176         netdevice->base_addr = dev->hpa.start;
 177         netdevice->irq = dev->irq;
 178
 179         if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) {
 180                 for (i = 0; i < 6; i++) {
 181                         netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
 182                 }
 183                 printk(KERN_INFO
 184                        "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
 185         }
 186
 187         lp = netdev_priv(netdevice);
 188         lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
 189
 190         retval = i82596_probe(netdevice);
 191         if (retval) {
 192                 free_netdev(netdevice);
 193                 return -ENODEV;
 194         }
 195         return retval;
 196 }
 197
 198 static int __exit lan_remove_chip(struct parisc_device *pdev)
 199 {
 200         struct net_device *dev = parisc_get_drvdata(pdev);
 201         struct i596_private *lp = netdev_priv(dev);
 202
 203         unregister_netdev (dev);
 204         dma_free_attrs(&pdev->dev, sizeof(struct i596_private), lp->dma,
 205                        lp->dma_addr, LIB82596_DMA_ATTR);
 206         free_netdev (dev);
 207         return 0;
 208 }
 209
 210 static const struct parisc_device_id lan_tbl[] __initconst = {
 211         { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
 212         { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
 213         { 0, }
 214 };
 215
 216 MODULE_DEVICE_TABLE(parisc, lan_tbl);
 217
 218 static struct parisc_driver lan_driver __refdata = {
 219         .name           = "lasi_82596",
 220         .id_table       = lan_tbl,
 221         .probe          = lan_init_chip,
 222         .remove         = __exit_p(lan_remove_chip),
 223 };
 224
 225 static int lasi_82596_init(void)
 226 {
 227         printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
 228         return register_parisc_driver(&lan_driver);
 229 }
 230
 231 module_init(lasi_82596_init);
 232
 233 static void __exit lasi_82596_exit(void)
 234 {
 235         unregister_parisc_driver(&lan_driver);
 236 }
 237
 238 module_exit(lasi_82596_exit);