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