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Linux/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_ALLOC                        dma_alloc_noncoherent
100 #define DMA_FREE                         dma_free_noncoherent
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         udelay(1);
147         gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
148 }
149 
150 #define LAN_PROM_ADDR   0xF0810000
151 
152 static int
153 lan_init_chip(struct parisc_device *dev)
154 {
155         struct  net_device *netdevice;
156         struct i596_private *lp;
157         int     retval;
158         int i;
159 
160         if (!dev->irq) {
161                 printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
162                         __FILE__, (unsigned long)dev->hpa.start);
163                 return -ENODEV;
164         }
165 
166         printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n",
167                         (unsigned long)dev->hpa.start, dev->irq);
168 
169         netdevice = alloc_etherdev(sizeof(struct i596_private));
170         if (!netdevice)
171                 return -ENOMEM;
172         SET_NETDEV_DEV(netdevice, &dev->dev);
173         parisc_set_drvdata (dev, netdevice);
174 
175         netdevice->base_addr = dev->hpa.start;
176         netdevice->irq = dev->irq;
177 
178         if (pdc_lan_station_id(netdevice->dev_addr, netdevice->base_addr)) {
179                 for (i = 0; i < 6; i++) {
180                         netdevice->dev_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
181                 }
182                 printk(KERN_INFO
183                        "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
184         }
185 
186         lp = netdev_priv(netdevice);
187         lp->options = dev->id.sversion == 0x72 ? OPT_SWAP_PORT : 0;
188 
189         retval = i82596_probe(netdevice);
190         if (retval) {
191                 free_netdev(netdevice);
192                 return -ENODEV;
193         }
194         return retval;
195 }
196 
197 static int lan_remove_chip(struct parisc_device *pdev)
198 {
199         struct net_device *dev = parisc_get_drvdata(pdev);
200         struct i596_private *lp = netdev_priv(dev);
201 
202         unregister_netdev (dev);
203         DMA_FREE(&pdev->dev, sizeof(struct i596_private),
204                  (void *)lp->dma, lp->dma_addr);
205         free_netdev (dev);
206         return 0;
207 }
208 
209 static struct parisc_device_id lan_tbl[] = {
210         { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
211         { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
212         { 0, }
213 };
214 
215 MODULE_DEVICE_TABLE(parisc, lan_tbl);
216 
217 static struct parisc_driver lan_driver = {
218         .name           = "lasi_82596",
219         .id_table       = lan_tbl,
220         .probe          = lan_init_chip,
221         .remove         = lan_remove_chip,
222 };
223 
224 static int lasi_82596_init(void)
225 {
226         printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");
227         return register_parisc_driver(&lan_driver);
228 }
229 
230 module_init(lasi_82596_init);
231 
232 static void __exit lasi_82596_exit(void)
233 {
234         unregister_parisc_driver(&lan_driver);
235 }
236 
237 module_exit(lasi_82596_exit);
238 

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