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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 <[email protected]>.
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_rx_mode(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 outb((ofs >> 8) | RDDATAflag | AUTOINCflag,
69 ioaddr + COM20020_REG_W_ADDR_HI);
70 outb(ofs & 0xff, ioaddr + COM20020_REG_W_ADDR_LO);
71
72 /* copy the data */
73 TIME(dev, "insb", count,
74 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 outb((ofs >> 8) | AUTOINCflag, ioaddr + COM20020_REG_W_ADDR_HI);
84 outb(ofs & 0xff, ioaddr + COM20020_REG_W_ADDR_LO);
85
86 /* copy the data */
87 TIME(dev, "outsb", count,
88 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 outb(XTOcfg(3) | RESETcfg, ioaddr + COM20020_REG_W_CONFIG);
98 udelay(5);
99 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 outb(lp->setup, ioaddr + COM20020_REG_W_XREG);
111
112 if (lp->clockm != 0) {
113 com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
114 outb(lp->setup2, ioaddr + COM20020_REG_W_XREG);
115
116 /* must now write the magic "restart operation" command */
117 mdelay(1);
118 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 outb(lp->config, ioaddr + COM20020_REG_W_CONFIG);
124 outb(0x42, ioaddr + COM20020_REG_W_XREG);
125
126 status = 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 outb(CFLAGScmd | RESETclear | CONFIGclear,
135 ioaddr + COM20020_REG_W_COMMAND);
136 status = 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 outb(0 | RDDATAflag | AUTOINCflag, ioaddr + COM20020_REG_W_ADDR_HI);
142 outb(0, ioaddr + COM20020_REG_W_ADDR_LO);
143
144 status = inb(ioaddr + COM20020_REG_RW_MEMDATA);
145 if (status != TESTvalue) {
146 arc_printk(D_NORMAL, dev, "Signature byte not found (%02Xh != D1h).\n",
147 status);
148 return -ENODEV;
149 }
150 return 0;
151}
152
153static int com20020_set_hwaddr(struct net_device *dev, void *addr)
154{
155 int ioaddr = dev->base_addr;
156 struct arcnet_local *lp = netdev_priv(dev);
157 struct sockaddr *hwaddr = addr;
158
159 dev_addr_set(dev, hwaddr->sa_data);
160 com20020_set_subaddress(lp, ioaddr, SUB_NODE);
161 outb(dev->dev_addr[0], ioaddr + COM20020_REG_W_XREG);
162
163 return 0;
164}
165
166static int com20020_netdev_open(struct net_device *dev)
167{
168 int ioaddr = dev->base_addr;
169 struct arcnet_local *lp = netdev_priv(dev);
170
171 lp->config |= TXENcfg;
172 outb(lp->config, ioaddr + COM20020_REG_W_CONFIG);
173
174 return arcnet_open(dev);
175}
176
177static int com20020_netdev_close(struct net_device *dev)
178{
179 int ioaddr = dev->base_addr;
180 struct arcnet_local *lp = netdev_priv(dev);
181
182 arcnet_close(dev);
183
184 /* disable transmitter */
185 lp->config &= ~TXENcfg;
186 outb(lp->config, ioaddr + COM20020_REG_W_CONFIG);
187 return 0;
188}
189
190const struct net_device_ops com20020_netdev_ops = {
191 .ndo_open = com20020_netdev_open,
192 .ndo_stop = com20020_netdev_close,
193 .ndo_start_xmit = arcnet_send_packet,
194 .ndo_tx_timeout = arcnet_timeout,
195 .ndo_set_mac_address = com20020_set_hwaddr,
196 .ndo_set_rx_mode = com20020_set_rx_mode,
197};
198
199/* Set up the struct net_device associated with this card. Called after
200 * probing succeeds.
201 */
202int com20020_found(struct net_device *dev, int shared)
203{
204 struct arcnet_local *lp;
205 int ioaddr = dev->base_addr;
206
207 /* Initialize the rest of the device structure. */
208
209 lp = netdev_priv(dev);
210
211 lp->hw.owner = THIS_MODULE;
212 lp->hw.command = com20020_command;
213 lp->hw.status = com20020_status;
214 lp->hw.intmask = com20020_setmask;
215 lp->hw.reset = com20020_reset;
216 lp->hw.copy_to_card = com20020_copy_to_card;
217 lp->hw.copy_from_card = com20020_copy_from_card;
218 lp->hw.close = com20020_close;
219
220 /* FIXME: do this some other way! */
221 if (!dev->dev_addr[0])
222 arcnet_set_addr(dev, inb(ioaddr + 8));
223
224 com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
225 outb(lp->setup, ioaddr + COM20020_REG_W_XREG);
226
227 if (lp->card_flags & ARC_CAN_10MBIT) {
228 com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
229 outb(lp->setup2, ioaddr + COM20020_REG_W_XREG);
230
231 /* must now write the magic "restart operation" command */
232 mdelay(1);
233 outb(STARTIOcmd, ioaddr + COM20020_REG_W_COMMAND);
234 }
235
236 lp->config = (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
237 /* Default 0x38 + register: Node ID */
238 outb(lp->config, ioaddr + COM20020_REG_W_CONFIG);
239 outb(dev->dev_addr[0], ioaddr + COM20020_REG_W_XREG);
240
241 /* reserve the irq */
242 if (request_irq(dev->irq, arcnet_interrupt, shared,
243 "arcnet (COM20020)", dev)) {
244 arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
245 return -ENODEV;
246 }
247
248 arc_printk(D_NORMAL, dev, "%s: station %02Xh found at %03lXh, IRQ %d.\n",
249 lp->card_name, dev->dev_addr[0], dev->base_addr, dev->irq);
250
251 if (lp->backplane)
252 arc_printk(D_NORMAL, dev, "Using backplane mode.\n");
253
254 if (lp->timeout != 3)
255 arc_printk(D_NORMAL, dev, "Using extended timeout value of %d\n",
256 lp->timeout);
257
258 arc_printk(D_NORMAL, dev, "Using CKP %d - data rate %s\n",
259 lp->setup >> 1,
260 clockrates[3 -
261 ((lp->setup2 & 0xF0) >> 4) +
262 ((lp->setup & 0x0F) >> 1)]);
263 /* The clockrates array index looks very fragile.
264 * It seems like it could have negative indexing.
265 */
266
267 if (register_netdev(dev)) {
268 free_irq(dev->irq, dev);
269 return -EIO;
270 }
271 return 0;
272}
273
274/* Do a hardware reset on the card, and set up necessary registers.
275 *
276 * This should be called as little as possible, because it disrupts the
277 * token on the network (causes a RECON) and requires a significant delay.
278 *
279 * However, it does make sure the card is in a defined state.
280 */
281static int com20020_reset(struct net_device *dev, int really_reset)
282{
283 struct arcnet_local *lp = netdev_priv(dev);
284 u_int ioaddr = dev->base_addr;
285 u_char inbyte;
286
287 arc_printk(D_DEBUG, dev, "%s: %d: %s: dev: %p, lp: %p, dev->name: %s\n",
288 __FILE__, __LINE__, __func__, dev, lp, dev->name);
289 arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
290 dev->name, inb(ioaddr + COM20020_REG_R_STATUS));
291
292 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
293 lp->config |= (lp->timeout << 3) | (lp->backplane << 2);
294 /* power-up defaults */
295 outb(lp->config, ioaddr + COM20020_REG_W_CONFIG);
296 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
297
298 if (really_reset) {
299 /* reset the card */
300 outb(lp->config | RESETcfg, ioaddr + COM20020_REG_W_CONFIG);
301 udelay(5);
302 outb(lp->config, ioaddr + COM20020_REG_W_CONFIG);
303 mdelay(RESETtime * 2);
304 /* COM20020 seems to be slower sometimes */
305 }
306 /* clear flags & end reset */
307 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
308 outb(CFLAGScmd | RESETclear | CONFIGclear,
309 ioaddr + COM20020_REG_W_COMMAND);
310
311 /* verify that the ARCnet signature byte is present */
312 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
313
314 com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
315 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
316 if (inbyte != TESTvalue) {
317 arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
318 __FILE__, __LINE__, __func__);
319 arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
320 return 1;
321 }
322 /* enable extended (512-byte) packets */
323 outb(CONFIGcmd | EXTconf, ioaddr + COM20020_REG_W_COMMAND);
324
325 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
326
327 /* done! return success. */
328 return 0;
329}
330
331static void com20020_setmask(struct net_device *dev, int mask)
332{
333 u_int ioaddr = dev->base_addr;
334
335 arc_printk(D_DURING, dev, "Setting mask to %x at %x\n", mask, ioaddr);
336 outb(mask, ioaddr + COM20020_REG_W_INTMASK);
337}
338
339static void com20020_command(struct net_device *dev, int cmd)
340{
341 u_int ioaddr = dev->base_addr;
342
343 outb(cmd, ioaddr + COM20020_REG_W_COMMAND);
344}
345
346static int com20020_status(struct net_device *dev)
347{
348 u_int ioaddr = dev->base_addr;
349
350 return inb(ioaddr + COM20020_REG_R_STATUS) +
351 (inb(ioaddr + COM20020_REG_R_DIAGSTAT) << 8);
352}
353
354static void com20020_close(struct net_device *dev)
355{
356 struct arcnet_local *lp = netdev_priv(dev);
357 int ioaddr = dev->base_addr;
358
359 /* disable transmitter */
360 lp->config &= ~TXENcfg;
361 outb(lp->config, ioaddr + COM20020_REG_W_CONFIG);
362}
363
364/* ARCnet does not support multicast, only unicast and broadcast */
365static void com20020_set_rx_mode(struct net_device *dev)
366{
367 struct arcnet_local *lp = netdev_priv(dev);
368 int ioaddr = dev->base_addr;
369
370 if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {
371 /* Enable promiscuous mode */
372 if (!(lp->setup & PROMISCset))
373 arc_printk(D_NORMAL, dev, "Setting promiscuous flag...\n");
374 com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
375 lp->setup |= PROMISCset;
376 outb(lp->setup, ioaddr + COM20020_REG_W_XREG);
377 } else {
378 /* Disable promiscuous mode, use normal mode */
379 if ((lp->setup & PROMISCset))
380 arc_printk(D_NORMAL, dev, "Resetting promiscuous flag...\n");
381 com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
382 lp->setup &= ~PROMISCset;
383 outb(lp->setup, ioaddr + COM20020_REG_W_XREG);
384 }
385}
386
387#ifdef CONFIG_ARCNET_COM20020_PCI_MODULE
388EXPORT_SYMBOL(com20020_check);
389EXPORT_SYMBOL(com20020_found);
390EXPORT_SYMBOL(com20020_netdev_ops);
391#endif
392
393MODULE_DESCRIPTION("ARCnet COM20020 chipset core driver");
394MODULE_LICENSE("GPL");