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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 (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
120MODULE_AUTHOR("Richard Hirst");
121MODULE_DESCRIPTION("i82596 driver");
122MODULE_LICENSE("GPL");
123module_param(i596_debug, int, 0);
124MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");
125
126static inline void ca(struct net_device *dev)
127{
128 gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
129}
130
131
132static 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
154static int __devinit
155lan_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__, dev->hpa.start);
165 return -ENODEV;
166 }
167
168 printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", dev->hpa.start,
169 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
199static 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
211static 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
217MODULE_DEVICE_TABLE(parisc, lan_tbl);
218
219static 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
226static 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
232module_init(lasi_82596_init);
233
234static void __exit lasi_82596_exit(void)
235{
236 unregister_parisc_driver(&lan_driver);
237}
238
239module_exit(lasi_82596_exit);