PageRenderTime 73ms CodeModel.GetById 14ms app.highlight 54ms RepoModel.GetById 2ms app.codeStats 0ms

/drivers/net/arcnet/com20020.c

http://github.com/mirrors/linux
C | 418 lines | 273 code | 72 blank | 73 comment | 24 complexity | e75f1fae8e8a85472fb2c51776bff1cd MD5 | raw file
  1/*
  2 * Linux ARCnet driver - COM20020 chipset support
  3 *
  4 * Written 1997 by David Woodhouse.
  5 * Written 1994-1999 by Avery Pennarun.
  6 * Written 1999 by Martin Mares <mj@ucw.cz>.
  7 * Derived from skeleton.c by Donald Becker.
  8 *
  9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
 10 *  for sponsoring the further development of this driver.
 11 *
 12 * **********************
 13 *
 14 * The original copyright of skeleton.c was as follows:
 15 *
 16 * skeleton.c Written 1993 by Donald Becker.
 17 * Copyright 1993 United States Government as represented by the
 18 * Director, National Security Agency.  This software may only be used
 19 * and distributed according to the terms of the GNU General Public License as
 20 * modified by SRC, incorporated herein by reference.
 21 *
 22 * **********************
 23 *
 24 * For more details, see drivers/net/arcnet.c
 25 *
 26 * **********************
 27 */
 28
 29#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
 30
 31#include <linux/module.h>
 32#include <linux/kernel.h>
 33#include <linux/types.h>
 34#include <linux/ioport.h>
 35#include <linux/errno.h>
 36#include <linux/delay.h>
 37#include <linux/netdevice.h>
 38#include <linux/init.h>
 39#include <linux/interrupt.h>
 40#include <linux/io.h>
 41
 42#include "arcdevice.h"
 43#include "com20020.h"
 44
 45static const char * const clockrates[] = {
 46	"XXXXXXX", "XXXXXXXX", "XXXXXX", "2.5 Mb/s",
 47	"1.25Mb/s", "625 Kb/s", "312.5 Kb/s", "156.25 Kb/s",
 48	"Reserved", "Reserved", "Reserved"
 49};
 50
 51static void com20020_command(struct net_device *dev, int command);
 52static int com20020_status(struct net_device *dev);
 53static void com20020_setmask(struct net_device *dev, int mask);
 54static int com20020_reset(struct net_device *dev, int really_reset);
 55static void com20020_copy_to_card(struct net_device *dev, int bufnum,
 56				  int offset, void *buf, int count);
 57static void com20020_copy_from_card(struct net_device *dev, int bufnum,
 58				    int offset, void *buf, int count);
 59static void com20020_set_mc_list(struct net_device *dev);
 60static void com20020_close(struct net_device *);
 61
 62static void com20020_copy_from_card(struct net_device *dev, int bufnum,
 63				    int offset, void *buf, int count)
 64{
 65	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
 66
 67	/* set up the address register */
 68	arcnet_outb((ofs >> 8) | RDDATAflag | AUTOINCflag,
 69		    ioaddr, COM20020_REG_W_ADDR_HI);
 70	arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);
 71
 72	/* copy the data */
 73	TIME(dev, "insb", count,
 74	     arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
 75}
 76
 77static void com20020_copy_to_card(struct net_device *dev, int bufnum,
 78				  int offset, void *buf, int count)
 79{
 80	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
 81
 82	/* set up the address register */
 83	arcnet_outb((ofs >> 8) | AUTOINCflag, ioaddr, COM20020_REG_W_ADDR_HI);
 84	arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);
 85
 86	/* copy the data */
 87	TIME(dev, "outsb", count,
 88	     arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
 89}
 90
 91/* Reset the card and check some basic stuff during the detection stage. */
 92int com20020_check(struct net_device *dev)
 93{
 94	int ioaddr = dev->base_addr, status;
 95	struct arcnet_local *lp = netdev_priv(dev);
 96
 97	arcnet_outb(XTOcfg(3) | RESETcfg, ioaddr, COM20020_REG_W_CONFIG);
 98	udelay(5);
 99	arcnet_outb(XTOcfg(3), ioaddr, COM20020_REG_W_CONFIG);
100	mdelay(RESETtime);
101
102	lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
103	lp->setup2 = (lp->clockm << 4) | 8;
104
105	/* CHECK: should we do this for SOHARD cards ? */
106	/* Enable P1Mode for backplane mode */
107	lp->setup = lp->setup | P1MODE;
108
109	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
110	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
111
112	if (lp->clockm != 0) {
113		com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
114		arcnet_outb(lp->setup2, ioaddr, COM20020_REG_W_XREG);
115
116		/* must now write the magic "restart operation" command */
117		mdelay(1);
118		arcnet_outb(STARTIOcmd, ioaddr, COM20020_REG_W_COMMAND);
119	}
120
121	lp->config = (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
122	/* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
123	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
124	arcnet_outb(0x42, ioaddr, COM20020_REG_W_XREG);
125
126	status = arcnet_inb(ioaddr, COM20020_REG_R_STATUS);
127
128	if ((status & 0x99) != (NORXflag | TXFREEflag | RESETflag)) {
129		arc_printk(D_NORMAL, dev, "status invalid (%Xh).\n", status);
130		return -ENODEV;
131	}
132	arc_printk(D_INIT_REASONS, dev, "status after reset: %X\n", status);
133
134	arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
135		    ioaddr, COM20020_REG_W_COMMAND);
136	status = arcnet_inb(ioaddr, COM20020_REG_R_STATUS);
137	arc_printk(D_INIT_REASONS, dev, "status after reset acknowledged: %X\n",
138		   status);
139
140	/* Read first location of memory */
141	arcnet_outb(0 | RDDATAflag | AUTOINCflag,
142		    ioaddr, COM20020_REG_W_ADDR_HI);
143	arcnet_outb(0, ioaddr, COM20020_REG_W_ADDR_LO);
144
145	status = arcnet_inb(ioaddr, COM20020_REG_RW_MEMDATA);
146	if (status != TESTvalue) {
147		arc_printk(D_NORMAL, dev, "Signature byte not found (%02Xh != D1h).\n",
148			   status);
149		return -ENODEV;
150	}
151	return 0;
152}
153
154static int com20020_set_hwaddr(struct net_device *dev, void *addr)
155{
156	int ioaddr = dev->base_addr;
157	struct arcnet_local *lp = netdev_priv(dev);
158	struct sockaddr *hwaddr = addr;
159
160	memcpy(dev->dev_addr, hwaddr->sa_data, 1);
161	com20020_set_subaddress(lp, ioaddr, SUB_NODE);
162	arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);
163
164	return 0;
165}
166
167static int com20020_netdev_open(struct net_device *dev)
168{
169	int ioaddr = dev->base_addr;
170	struct arcnet_local *lp = netdev_priv(dev);
171
172	lp->config |= TXENcfg;
173	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
174
175	return arcnet_open(dev);
176}
177
178static int com20020_netdev_close(struct net_device *dev)
179{
180	int ioaddr = dev->base_addr;
181	struct arcnet_local *lp = netdev_priv(dev);
182
183	arcnet_close(dev);
184
185	/* disable transmitter */
186	lp->config &= ~TXENcfg;
187	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
188	return 0;
189}
190
191const struct net_device_ops com20020_netdev_ops = {
192	.ndo_open	= com20020_netdev_open,
193	.ndo_stop	= com20020_netdev_close,
194	.ndo_start_xmit = arcnet_send_packet,
195	.ndo_tx_timeout = arcnet_timeout,
196	.ndo_set_mac_address = com20020_set_hwaddr,
197	.ndo_set_rx_mode = com20020_set_mc_list,
198};
199
200/* Set up the struct net_device associated with this card.  Called after
201 * probing succeeds.
202 */
203int com20020_found(struct net_device *dev, int shared)
204{
205	struct arcnet_local *lp;
206	int ioaddr = dev->base_addr;
207
208	/* Initialize the rest of the device structure. */
209
210	lp = netdev_priv(dev);
211
212	lp->hw.owner = THIS_MODULE;
213	lp->hw.command = com20020_command;
214	lp->hw.status = com20020_status;
215	lp->hw.intmask = com20020_setmask;
216	lp->hw.reset = com20020_reset;
217	lp->hw.copy_to_card = com20020_copy_to_card;
218	lp->hw.copy_from_card = com20020_copy_from_card;
219	lp->hw.close = com20020_close;
220
221	/* FIXME: do this some other way! */
222	if (!dev->dev_addr[0])
223		dev->dev_addr[0] = arcnet_inb(ioaddr, 8);
224
225	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
226	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
227
228	if (lp->card_flags & ARC_CAN_10MBIT) {
229		com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
230		arcnet_outb(lp->setup2, ioaddr, COM20020_REG_W_XREG);
231
232		/* must now write the magic "restart operation" command */
233		mdelay(1);
234		arcnet_outb(STARTIOcmd, ioaddr, COM20020_REG_W_COMMAND);
235	}
236
237	lp->config = (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
238	/* Default 0x38 + register: Node ID */
239	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
240	arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);
241
242	/* reserve the irq */
243	if (request_irq(dev->irq, arcnet_interrupt, shared,
244			"arcnet (COM20020)", dev)) {
245		arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
246		return -ENODEV;
247	}
248
249	arc_printk(D_NORMAL, dev, "%s: station %02Xh found at %03lXh, IRQ %d.\n",
250		   lp->card_name, dev->dev_addr[0], dev->base_addr, dev->irq);
251
252	if (lp->backplane)
253		arc_printk(D_NORMAL, dev, "Using backplane mode.\n");
254
255	if (lp->timeout != 3)
256		arc_printk(D_NORMAL, dev, "Using extended timeout value of %d\n",
257			   lp->timeout);
258
259	arc_printk(D_NORMAL, dev, "Using CKP %d - data rate %s\n",
260		   lp->setup >> 1,
261		   clockrates[3 -
262			      ((lp->setup2 & 0xF0) >> 4) +
263			      ((lp->setup & 0x0F) >> 1)]);
264			/* The clockrates array index looks very fragile.
265			 * It seems like it could have negative indexing.
266			 */
267
268	if (register_netdev(dev)) {
269		free_irq(dev->irq, dev);
270		return -EIO;
271	}
272	return 0;
273}
274
275/* Do a hardware reset on the card, and set up necessary registers.
276 *
277 * This should be called as little as possible, because it disrupts the
278 * token on the network (causes a RECON) and requires a significant delay.
279 *
280 * However, it does make sure the card is in a defined state.
281 */
282static int com20020_reset(struct net_device *dev, int really_reset)
283{
284	struct arcnet_local *lp = netdev_priv(dev);
285	u_int ioaddr = dev->base_addr;
286	u_char inbyte;
287
288	arc_printk(D_DEBUG, dev, "%s: %d: %s: dev: %p, lp: %p, dev->name: %s\n",
289		   __FILE__, __LINE__, __func__, dev, lp, dev->name);
290	arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
291		   dev->name, arcnet_inb(ioaddr, COM20020_REG_R_STATUS));
292
293	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
294	lp->config |= (lp->timeout << 3) | (lp->backplane << 2);
295	/* power-up defaults */
296	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
297	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
298
299	if (really_reset) {
300		/* reset the card */
301		arcnet_outb(lp->config | RESETcfg, ioaddr, COM20020_REG_W_CONFIG);
302		udelay(5);
303		arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
304		mdelay(RESETtime * 2);
305				/* COM20020 seems to be slower sometimes */
306	}
307	/* clear flags & end reset */
308	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
309	arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
310		    ioaddr, COM20020_REG_W_COMMAND);
311
312	/* verify that the ARCnet signature byte is present */
313	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
314
315	com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
316	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
317	if (inbyte != TESTvalue) {
318		arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
319			   __FILE__, __LINE__, __func__);
320		arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
321		return 1;
322	}
323	/* enable extended (512-byte) packets */
324	arcnet_outb(CONFIGcmd | EXTconf, ioaddr, COM20020_REG_W_COMMAND);
325
326	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
327
328	/* done!  return success. */
329	return 0;
330}
331
332static void com20020_setmask(struct net_device *dev, int mask)
333{
334	u_int ioaddr = dev->base_addr;
335
336	arc_printk(D_DURING, dev, "Setting mask to %x at %x\n", mask, ioaddr);
337	arcnet_outb(mask, ioaddr, COM20020_REG_W_INTMASK);
338}
339
340static void com20020_command(struct net_device *dev, int cmd)
341{
342	u_int ioaddr = dev->base_addr;
343
344	arcnet_outb(cmd, ioaddr, COM20020_REG_W_COMMAND);
345}
346
347static int com20020_status(struct net_device *dev)
348{
349	u_int ioaddr = dev->base_addr;
350
351	return arcnet_inb(ioaddr, COM20020_REG_R_STATUS) +
352		(arcnet_inb(ioaddr, COM20020_REG_R_DIAGSTAT) << 8);
353}
354
355static void com20020_close(struct net_device *dev)
356{
357	struct arcnet_local *lp = netdev_priv(dev);
358	int ioaddr = dev->base_addr;
359
360	/* disable transmitter */
361	lp->config &= ~TXENcfg;
362	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
363}
364
365/* Set or clear the multicast filter for this adaptor.
366 * num_addrs == -1    Promiscuous mode, receive all packets
367 * num_addrs == 0       Normal mode, clear multicast list
368 * num_addrs > 0        Multicast mode, receive normal and MC packets, and do
369 *                      best-effort filtering.
370 *      FIXME - do multicast stuff, not just promiscuous.
371 */
372static void com20020_set_mc_list(struct net_device *dev)
373{
374	struct arcnet_local *lp = netdev_priv(dev);
375	int ioaddr = dev->base_addr;
376
377	if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {
378		/* Enable promiscuous mode */
379		if (!(lp->setup & PROMISCset))
380			arc_printk(D_NORMAL, dev, "Setting promiscuous flag...\n");
381		com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
382		lp->setup |= PROMISCset;
383		arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
384	} else {
385		/* Disable promiscuous mode, use normal mode */
386		if ((lp->setup & PROMISCset))
387			arc_printk(D_NORMAL, dev, "Resetting promiscuous flag...\n");
388		com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
389		lp->setup &= ~PROMISCset;
390		arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
391	}
392}
393
394#if defined(CONFIG_ARCNET_COM20020_PCI_MODULE) || \
395    defined(CONFIG_ARCNET_COM20020_ISA_MODULE) || \
396    defined(CONFIG_ARCNET_COM20020_CS_MODULE)
397EXPORT_SYMBOL(com20020_check);
398EXPORT_SYMBOL(com20020_found);
399EXPORT_SYMBOL(com20020_netdev_ops);
400#endif
401
402MODULE_LICENSE("GPL");
403
404#ifdef MODULE
405
406static int __init com20020_module_init(void)
407{
408	if (BUGLVL(D_NORMAL))
409		pr_info("%s\n", "COM20020 chipset support (by David Woodhouse et al.)");
410	return 0;
411}
412
413static void __exit com20020_module_exit(void)
414{
415}
416module_init(com20020_module_init);
417module_exit(com20020_module_exit);
418#endif				/* MODULE */