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lasi_82596.c
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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 ([email protected])
24 
25  02/01/2000 Initial modifications for parisc by Helge Deller ([email protected])
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 <[email protected]>
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 [email protected], 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/init.h>
83 #include <linux/types.h>
84 #include <linux/bitops.h>
85 #include <linux/dma-mapping.h>
86 
87 #include <asm/io.h>
88 #include <asm/irq.h>
89 #include <asm/pdc.h>
90 #include <asm/parisc-device.h>
91 
92 #define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"
93 
94 #define PA_I82596_RESET 0 /* Offsets relative to LASI-LAN-Addr.*/
95 #define PA_CPU_PORT_L_ACCESS 4
96 #define PA_CHANNEL_ATTENTION 8
97 
98 #define OPT_SWAP_PORT 0x0001 /* Need to wordswp on the MPU port */
99 
100 #define DMA_ALLOC dma_alloc_noncoherent
101 #define DMA_FREE dma_free_noncoherent
102 #define DMA_WBACK(ndev, addr, len) \
103  do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_TO_DEVICE); } while (0)
104 
105 #define DMA_INV(ndev, addr, len) \
106  do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_FROM_DEVICE); } while (0)
107 
108 #define DMA_WBACK_INV(ndev, addr, len) \
109  do { dma_cache_sync((ndev)->dev.parent, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0)
110 
111 #define SYSBUS 0x0000006c;
112 
113 /* big endian CPU, 82596 "big" endian mode */
114 #define SWAP32(x) (((u32)(x)<<16) | ((((u32)(x)))>>16))
115 #define SWAP16(x) (x)
116 
117 #include "lib82596.c"
118 
119 MODULE_AUTHOR("Richard Hirst");
120 MODULE_DESCRIPTION("i82596 driver");
121 MODULE_LICENSE("GPL");
122 module_param(i596_debug, int, 0);
123 MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
124 
125 static inline void ca(struct net_device *dev)
126 {
127  gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
128 }
129 
130 
131 static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
132 {
133  struct i596_private *lp = netdev_priv(dev);
134 
135  u32 v = (u32) (c) | (u32) (x);
136  u16 a, b;
137 
138  if (lp->options & OPT_SWAP_PORT) {
139  a = v >> 16;
140  b = v & 0xffff;
141  } else {
142  a = v & 0xffff;
143  b = v >> 16;
144  }
145 
146  gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
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 __devinit
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  }
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 __devexit 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(&pdev->dev, sizeof(struct i596_private),
205  (void *)lp->dma, lp->dma_addr);
206  free_netdev (dev);
207  return 0;
208 }
209 
210 static struct parisc_device_id lan_tbl[] = {
213  { 0, }
214 };
215 
216 MODULE_DEVICE_TABLE(parisc, lan_tbl);
217 
218 static struct parisc_driver lan_driver = {
219  .name = "lasi_82596",
220  .id_table = lan_tbl,
221  .probe = lan_init_chip,
222  .remove = __devexit_p(lan_remove_chip),
223 };
224 
225 static int __devinit lasi_82596_init(void)
226 {
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);