aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/arcnet/com20020.c
blob: 8b51313b1300b9f5b4c30c2eb9ff3383c2cb759f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
/*
 * Linux ARCnet driver - COM20020 chipset support
 * 
 * Written 1997 by David Woodhouse.
 * Written 1994-1999 by Avery Pennarun.
 * Written 1999 by Martin Mares <mj@ucw.cz>.
 * Derived from skeleton.c by Donald Becker.
 *
 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
 *  for sponsoring the further development of this driver.
 *
 * **********************
 *
 * The original copyright of skeleton.c was as follows:
 *
 * skeleton.c Written 1993 by Donald Becker.
 * Copyright 1993 United States Government as represented by the
 * Director, National Security Agency.  This software may only be used
 * and distributed according to the terms of the GNU General Public License as
 * modified by SRC, incorporated herein by reference.
 *
 * **********************
 *
 * For more details, see drivers/net/arcnet.c
 *
 * **********************
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/arcdevice.h>
#include <linux/com20020.h>

#include <asm/io.h>

#define VERSION "arcnet: COM20020 chipset support (by David Woodhouse et al.)\n"

static char *clockrates[] =
{"10 Mb/s", "Reserved", "5 Mb/s",
 "2.5 Mb/s", "1.25Mb/s", "625 Kb/s", "312.5 Kb/s",
 "156.25 Kb/s", "Reserved", "Reserved", "Reserved"};

static void com20020_command(struct net_device *dev, int command);
static int com20020_status(struct net_device *dev);
static void com20020_setmask(struct net_device *dev, int mask);
static int com20020_reset(struct net_device *dev, int really_reset);
static void com20020_copy_to_card(struct net_device *dev, int bufnum,
				  int offset, void *buf, int count);
static void com20020_copy_from_card(struct net_device *dev, int bufnum,
				    int offset, void *buf, int count);
static void com20020_set_mc_list(struct net_device *dev);
static void com20020_close(struct net_device *);

static void com20020_copy_from_card(struct net_device *dev, int bufnum,
				    int offset, void *buf, int count)
{
	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;

	/* set up the address register */
	outb((ofs >> 8) | RDDATAflag | AUTOINCflag, _ADDR_HI);
	outb(ofs & 0xff, _ADDR_LO);

	/* copy the data */
	TIME("insb", count, insb(_MEMDATA, buf, count));
}


static void com20020_copy_to_card(struct net_device *dev, int bufnum,
				  int offset, void *buf, int count)
{
	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;

	/* set up the address register */
	outb((ofs >> 8) | AUTOINCflag, _ADDR_HI);
	outb(ofs & 0xff, _ADDR_LO);

	/* copy the data */
	TIME("outsb", count, outsb(_MEMDATA, buf, count));
}


/* Reset the card and check some basic stuff during the detection stage. */
int com20020_check(struct net_device *dev)
{
	int ioaddr = dev->base_addr, status;
	struct arcnet_local *lp = dev->priv;

	ARCRESET0;
	mdelay(RESETtime);

	lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
	lp->setup2 = (lp->clockm << 4) | 8;

	/* CHECK: should we do this for SOHARD cards ? */
	/* Enable P1Mode for backplane mode */
	lp->setup = lp->setup | P1MODE;

	SET_SUBADR(SUB_SETUP1);
	outb(lp->setup, _XREG);

	if (lp->clockm != 0)
	{
		SET_SUBADR(SUB_SETUP2);
		outb(lp->setup2, _XREG);
	
		/* must now write the magic "restart operation" command */
		mdelay(1);
		outb(0x18, _COMMAND);
	}

	lp->config = 0x21 | (lp->timeout << 3) | (lp->backplane << 2);
	/* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
	SETCONF;
	outb(0x42, ioaddr + BUS_ALIGN*7);

	status = ASTATUS();

	if ((status & 0x99) != (NORXflag | TXFREEflag | RESETflag)) {
		BUGMSG(D_NORMAL, "status invalid (%Xh).\n", status);
		return -ENODEV;
	}
	BUGMSG(D_INIT_REASONS, "status after reset: %X\n", status);

	/* Enable TX */
	outb(0x39, _CONFIG);
	outb(inb(ioaddr + BUS_ALIGN*8), ioaddr + BUS_ALIGN*7);

	ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);

	status = ASTATUS();
	BUGMSG(D_INIT_REASONS, "status after reset acknowledged: %X\n",
	       status);

	/* Read first location of memory */
	outb(0 | RDDATAflag | AUTOINCflag, _ADDR_HI);
	outb(0, _ADDR_LO);

	if ((status = inb(_MEMDATA)) != TESTvalue) {
		BUGMSG(D_NORMAL, "Signature byte not found (%02Xh != D1h).\n",
		       status);
		return -ENODEV;
	}
	return 0;
}

/* Set up the struct net_device associated with this card.  Called after
 * probing succeeds.
 */
int com20020_found(struct net_device *dev, int shared)
{
	struct arcnet_local *lp;
	int ioaddr = dev->base_addr;

	/* Initialize the rest of the device structure. */

	lp = dev->priv;

	lp->hw.owner = THIS_MODULE;
	lp->hw.command = com20020_command;
	lp->hw.status = com20020_status;
	lp->hw.intmask = com20020_setmask;
	lp->hw.reset = com20020_reset;
	lp->hw.copy_to_card = com20020_copy_to_card;
	lp->hw.copy_from_card = com20020_copy_from_card;
	lp->hw.close = com20020_close;

	dev->set_multicast_list = com20020_set_mc_list;

	if (!dev->dev_addr[0])
		dev->dev_addr[0] = inb(ioaddr + BUS_ALIGN*8);	/* FIXME: do this some other way! */

	SET_SUBADR(SUB_SETUP1);
	outb(lp->setup, _XREG);

	if (lp->card_flags & ARC_CAN_10MBIT)
	{
		SET_SUBADR(SUB_SETUP2);
		outb(lp->setup2, _XREG);
	
		/* must now write the magic "restart operation" command */
		mdelay(1);
		outb(0x18, _COMMAND);
	}

	lp->config = 0x20 | (lp->timeout << 3) | (lp->backplane << 2) | 1;
	/* Default 0x38 + register: Node ID */
	SETCONF;
	outb(dev->dev_addr[0], _XREG);

	/* reserve the irq */
	if (request_irq(dev->irq, &arcnet_interrupt, shared,
			"arcnet (COM20020)", dev)) {
		BUGMSG(D_NORMAL, "Can't get IRQ %d!\n", dev->irq);
		return -ENODEV;
	}

	dev->base_addr = ioaddr;

	BUGMSG(D_NORMAL, "%s: station %02Xh found at %03lXh, IRQ %d.\n",
	       lp->card_name, dev->dev_addr[0], dev->base_addr, dev->irq);

	if (lp->backplane)
		BUGMSG(D_NORMAL, "Using backplane mode.\n");

	if (lp->timeout != 3)
		BUGMSG(D_NORMAL, "Using extended timeout value of %d.\n", lp->timeout);

	BUGMSG(D_NORMAL, "Using CKP %d - data rate %s.\n",
	       lp->setup >> 1, 
	       clockrates[3 - ((lp->setup2 & 0xF0) >> 4) + ((lp->setup & 0x0F) >> 1)]);

	if (register_netdev(dev)) {
		free_irq(dev->irq, dev);
		return -EIO;
	}
	return 0;
}


/* 
 * Do a hardware reset on the card, and set up necessary registers.
 * 
 * This should be called as little as possible, because it disrupts the
 * token on the network (causes a RECON) and requires a significant delay.
 *
 * However, it does make sure the card is in a defined state.
 */
static int com20020_reset(struct net_device *dev, int really_reset)
{
	struct arcnet_local *lp = dev->priv;
	u_int ioaddr = dev->base_addr;
	u_char inbyte;

	BUGMSG(D_DEBUG, "%s: %d: %s: dev: %p, lp: %p, dev->name: %s\n",
		__FILE__,__LINE__,__FUNCTION__,dev,lp,dev->name);
	BUGMSG(D_INIT, "Resetting %s (status=%02Xh)\n",
	       dev->name, ASTATUS());

	BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
	lp->config = TXENcfg | (lp->timeout << 3) | (lp->backplane << 2);
	/* power-up defaults */
	SETCONF;
	BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);

	if (really_reset) {
		/* reset the card */
		ARCRESET;
		mdelay(RESETtime * 2);	/* COM20020 seems to be slower sometimes */
	}
	/* clear flags & end reset */
	BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
	ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);

	/* verify that the ARCnet signature byte is present */
	BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);

	com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
	BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
	if (inbyte != TESTvalue) {
		BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
		BUGMSG(D_NORMAL, "reset failed: TESTvalue not present.\n");
		return 1;
	}
	/* enable extended (512-byte) packets */
	ACOMMAND(CONFIGcmd | EXTconf);
	BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);

	/* done!  return success. */
	return 0;
}


static void com20020_setmask(struct net_device *dev, int mask)
{
	u_int ioaddr = dev->base_addr;
	BUGMSG(D_DURING, "Setting mask to %x at %x\n",mask,ioaddr);
	AINTMASK(mask);
}


static void com20020_command(struct net_device *dev, int cmd)
{
	u_int ioaddr = dev->base_addr;
	ACOMMAND(cmd);
}


static int com20020_status(struct net_device *dev)
{
	u_int ioaddr = dev->base_addr;

	return ASTATUS() + (ADIAGSTATUS()<<8);
}

static void com20020_close(struct net_device *dev)
{
	struct arcnet_local *lp = dev->priv;
	int ioaddr = dev->base_addr;

	/* disable transmitter */
	lp->config &= ~TXENcfg;
	SETCONF;
}

/* Set or clear the multicast filter for this adaptor.
 * num_addrs == -1    Promiscuous mode, receive all packets
 * num_addrs == 0       Normal mode, clear multicast list
 * num_addrs > 0        Multicast mode, receive normal and MC packets, and do
 *                      best-effort filtering.
 *      FIXME - do multicast stuff, not just promiscuous.
 */
static void com20020_set_mc_list(struct net_device *dev)
{
	struct arcnet_local *lp = dev->priv;
	int ioaddr = dev->base_addr;

	if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {	/* Enable promiscuous mode */
		if (!(lp->setup & PROMISCset))
			BUGMSG(D_NORMAL, "Setting promiscuous flag...\n");
		SET_SUBADR(SUB_SETUP1);
		lp->setup |= PROMISCset;
		outb(lp->setup, _XREG);
	} else
		/* Disable promiscuous mode, use normal mode */
	{
		if ((lp->setup & PROMISCset))
			BUGMSG(D_NORMAL, "Resetting promiscuous flag...\n");
		SET_SUBADR(SUB_SETUP1);
		lp->setup &= ~PROMISCset;
		outb(lp->setup, _XREG);
	}
}

#if defined(CONFIG_ARCNET_COM20020_PCI_MODULE) || \
    defined(CONFIG_ARCNET_COM20020_ISA_MODULE) || \
    defined(CONFIG_ARCNET_COM20020_CS_MODULE)
EXPORT_SYMBOL(com20020_check);
EXPORT_SYMBOL(com20020_found);
#endif

MODULE_LICENSE("GPL");

#ifdef MODULE

static int __init com20020_module_init(void)
{
	BUGLVL(D_NORMAL) printk(VERSION);
	return 0;
}

static void __exit com20020_module_exit(void)
{
}
module_init(com20020_module_init);
module_exit(com20020_module_exit);
#endif				/* MODULE */