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kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / net / hp.c
blob59cf841b14abc06ad2fa11f44ca55ac0dfa6f157
1 /* hp.c: A HP LAN ethernet driver for linux. */
2 /*
3 Written 1993-94 by Donald Becker.
4
5 Copyright 1993 United States Government as represented by the
6 Director, National Security Agency.
7
8 This software may be used and distributed according to the terms
9 of the GNU General Public License, incorporated herein by reference.
10
11 The author may be reached as becker@scyld.com, or C/O
12 Scyld Computing Corporation
13 410 Severn Ave., Suite 210
14 Annapolis MD 21403
15
16 This is a driver for the HP PC-LAN adaptors.
17
18 Sources:
19 The Crynwr packet driver.
20 */
21
22 static const char version[] =
23 "hp.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
24
25
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/errno.h>
29 #include <linux/ioport.h>
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/init.h>
33 #include <linux/delay.h>
34
35 #include <asm/system.h>
36 #include <asm/io.h>
37
38 #include "8390.h"
39
40 #define DRV_NAME "hp"
41
42 /* A zero-terminated list of I/O addresses to be probed. */
43 static unsigned int hppclan_portlist[] __initdata =
44 { 0x300, 0x320, 0x340, 0x280, 0x2C0, 0x200, 0x240, 0};
45
46 #define HP_IO_EXTENT 32
47
48 #define HP_DATAPORT 0x0c /* "Remote DMA" data port. */
49 #define HP_ID 0x07
50 #define HP_CONFIGURE 0x08 /* Configuration register. */
51 #define HP_RUN 0x01 /* 1 == Run, 0 == reset. */
52 #define HP_IRQ 0x0E /* Mask for software-configured IRQ line. */
53 #define HP_DATAON 0x10 /* Turn on dataport */
54 #define NIC_OFFSET 0x10 /* Offset the 8390 registers. */
55
56 #define HP_START_PG 0x00 /* First page of TX buffer */
57 #define HP_8BSTOP_PG 0x80 /* Last page +1 of RX ring */
58 #define HP_16BSTOP_PG 0xFF /* Same, for 16 bit cards. */
59
60 static int hp_probe1(struct net_device *dev, int ioaddr);
61
62 static int hp_open(struct net_device *dev);
63 static int hp_close(struct net_device *dev);
64 static void hp_reset_8390(struct net_device *dev);
65 static void hp_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
66 int ring_page);
67 static void hp_block_input(struct net_device *dev, int count,
68 struct sk_buff *skb , int ring_offset);
69 static void hp_block_output(struct net_device *dev, int count,
70 const unsigned char *buf, int start_page);
71
72 static void hp_init_card(struct net_device *dev);
73
74 /* The map from IRQ number to HP_CONFIGURE register setting. */
75 /* My default is IRQ5 0 1 2 3 4 5 6 7 8 9 10 11 */
76 static char irqmap[16] __initdata= { 0, 0, 4, 6, 8,10, 0,14, 0, 4, 2,12,0,0,0,0};
77
78 \f
79 /* Probe for an HP LAN adaptor.
80 Also initialize the card and fill in STATION_ADDR with the station
81 address. */
82
83 static int __init do_hp_probe(struct net_device *dev)
84 {
85 int i;
86 int base_addr = dev->base_addr;
87 int irq = dev->irq;
88
89 SET_MODULE_OWNER(dev);
90
91 if (base_addr > 0x1ff) /* Check a single specified location. */
92 return hp_probe1(dev, base_addr);
93 else if (base_addr != 0) /* Don't probe at all. */
94 return -ENXIO;
95
96 for (i = 0; hppclan_portlist[i]; i++) {
97 if (hp_probe1(dev, hppclan_portlist[i]) == 0)
98 return 0;
99 dev->irq = irq;
100 }
101
102 return -ENODEV;
103 }
104
105 static void cleanup_card(struct net_device *dev)
106 {
107 free_irq(dev->irq, dev);
108 release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
109 }
110
111 #ifndef MODULE
112 struct net_device * __init hp_probe(int unit)
113 {
114 struct net_device *dev = alloc_ei_netdev();
115 int err;
116
117 if (!dev)
118 return ERR_PTR(-ENOMEM);
119
120 sprintf(dev->name, "eth%d", unit);
121 netdev_boot_setup_check(dev);
122
123 err = do_hp_probe(dev);
124 if (err)
125 goto out;
126 return dev;
127 out:
128 free_netdev(dev);
129 return ERR_PTR(err);
130 }
131 #endif
132
133 static int __init hp_probe1(struct net_device *dev, int ioaddr)
134 {
135 int i, retval, board_id, wordmode;
136 const char *name;
137 static unsigned version_printed;
138
139 if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
140 return -EBUSY;
141
142 /* Check for the HP physical address, 08 00 09 xx xx xx. */
143 /* This really isn't good enough: we may pick up HP LANCE boards
144 also! Avoid the lance 0x5757 signature. */
145 if (inb(ioaddr) != 0x08
146 || inb(ioaddr+1) != 0x00
147 || inb(ioaddr+2) != 0x09
148 || inb(ioaddr+14) == 0x57) {
149 retval = -ENODEV;
150 goto out;
151 }
152
153 /* Set up the parameters based on the board ID.
154 If you have additional mappings, please mail them to me -djb. */
155 if ((board_id = inb(ioaddr + HP_ID)) & 0x80) {
156 name = "HP27247";
157 wordmode = 1;
158 } else {
159 name = "HP27250";
160 wordmode = 0;
161 }
162
163 if (ei_debug && version_printed++ == 0)
164 printk(version);
165
166 printk("%s: %s (ID %02x) at %#3x,", dev->name, name, board_id, ioaddr);
167
168 for(i = 0; i < ETHER_ADDR_LEN; i++)
169 printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
170
171 /* Snarf the interrupt now. Someday this could be moved to open(). */
172 if (dev->irq < 2) {
173 int irq_16list[] = { 11, 10, 5, 3, 4, 7, 9, 0};
174 int irq_8list[] = { 7, 5, 3, 4, 9, 0};
175 int *irqp = wordmode ? irq_16list : irq_8list;
176 do {
177 int irq = *irqp;
178 if (request_irq (irq, NULL, 0, "bogus", NULL) != -EBUSY) {
179 unsigned long cookie = probe_irq_on();
180 /* Twinkle the interrupt, and check if it's seen. */
181 outb_p(irqmap[irq] | HP_RUN, ioaddr + HP_CONFIGURE);
182 outb_p( 0x00 | HP_RUN, ioaddr + HP_CONFIGURE);
183 if (irq == probe_irq_off(cookie) /* It's a good IRQ line! */
184 && request_irq (irq, ei_interrupt, 0, DRV_NAME, dev) == 0) {
185 printk(" selecting IRQ %d.\n", irq);
186 dev->irq = *irqp;
187 break;
188 }
189 }
190 } while (*++irqp);
191 if (*irqp == 0) {
192 printk(" no free IRQ lines.\n");
193 retval = -EBUSY;
194 goto out;
195 }
196 } else {
197 if (dev->irq == 2)
198 dev->irq = 9;
199 if ((retval = request_irq(dev->irq, ei_interrupt, 0, DRV_NAME, dev))) {
200 printk (" unable to get IRQ %d.\n", dev->irq);
201 goto out;
202 }
203 }
204
205 /* Set the base address to point to the NIC, not the "real" base! */
206 dev->base_addr = ioaddr + NIC_OFFSET;
207 dev->open = &hp_open;
208 dev->stop = &hp_close;
209 #ifdef CONFIG_NET_POLL_CONTROLLER
210 dev->poll_controller = ei_poll;
211 #endif
212
213 ei_status.name = name;
214 ei_status.word16 = wordmode;
215 ei_status.tx_start_page = HP_START_PG;
216 ei_status.rx_start_page = HP_START_PG + TX_PAGES;
217 ei_status.stop_page = wordmode ? HP_16BSTOP_PG : HP_8BSTOP_PG;
218
219 ei_status.reset_8390 = &hp_reset_8390;
220 ei_status.get_8390_hdr = &hp_get_8390_hdr;
221 ei_status.block_input = &hp_block_input;
222 ei_status.block_output = &hp_block_output;
223 hp_init_card(dev);
224
225 retval = register_netdev(dev);
226 if (retval)
227 goto out1;
228 return 0;
229 out1:
230 free_irq(dev->irq, dev);
231 out:
232 release_region(ioaddr, HP_IO_EXTENT);
233 return retval;
234 }
235
236 static int
237 hp_open(struct net_device *dev)
238 {
239 ei_open(dev);
240 return 0;
241 }
242
243 static int
244 hp_close(struct net_device *dev)
245 {
246 ei_close(dev);
247 return 0;
248 }
249
250 static void
251 hp_reset_8390(struct net_device *dev)
252 {
253 int hp_base = dev->base_addr - NIC_OFFSET;
254 int saved_config = inb_p(hp_base + HP_CONFIGURE);
255
256 if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
257 outb_p(0x00, hp_base + HP_CONFIGURE);
258 ei_status.txing = 0;
259 /* Pause just a few cycles for the hardware reset to take place. */
260 udelay(5);
261
262 outb_p(saved_config, hp_base + HP_CONFIGURE);
263 udelay(5);
264
265 if ((inb_p(hp_base+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
266 printk("%s: hp_reset_8390() did not complete.\n", dev->name);
267
268 if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
269 return;
270 }
271
272 static void
273 hp_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
274 {
275 int nic_base = dev->base_addr;
276 int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
277
278 outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
279 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base);
280 outb_p(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
281 outb_p(0, nic_base + EN0_RCNTHI);
282 outb_p(0, nic_base + EN0_RSARLO); /* On page boundary */
283 outb_p(ring_page, nic_base + EN0_RSARHI);
284 outb_p(E8390_RREAD+E8390_START, nic_base);
285
286 if (ei_status.word16)
287 insw(nic_base - NIC_OFFSET + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
288 else
289 insb(nic_base - NIC_OFFSET + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr));
290
291 outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
292 }
293
294 /* Block input and output, similar to the Crynwr packet driver. If you are
295 porting to a new ethercard look at the packet driver source for hints.
296 The HP LAN doesn't use shared memory -- we put the packet
297 out through the "remote DMA" dataport. */
298
299 static void
300 hp_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
301 {
302 int nic_base = dev->base_addr;
303 int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
304 int xfer_count = count;
305 char *buf = skb->data;
306
307 outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
308 outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base);
309 outb_p(count & 0xff, nic_base + EN0_RCNTLO);
310 outb_p(count >> 8, nic_base + EN0_RCNTHI);
311 outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
312 outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
313 outb_p(E8390_RREAD+E8390_START, nic_base);
314 if (ei_status.word16) {
315 insw(nic_base - NIC_OFFSET + HP_DATAPORT,buf,count>>1);
316 if (count & 0x01)
317 buf[count-1] = inb(nic_base - NIC_OFFSET + HP_DATAPORT), xfer_count++;
318 } else {
319 insb(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count);
320 }
321 /* This is for the ALPHA version only, remove for later releases. */
322 if (ei_debug > 0) { /* DMA termination address check... */
323 int high = inb_p(nic_base + EN0_RSARHI);
324 int low = inb_p(nic_base + EN0_RSARLO);
325 int addr = (high << 8) + low;
326 /* Check only the lower 8 bits so we can ignore ring wrap. */
327 if (((ring_offset + xfer_count) & 0xff) != (addr & 0xff))
328 printk("%s: RX transfer address mismatch, %#4.4x vs. %#4.4x (actual).\n",
329 dev->name, ring_offset + xfer_count, addr);
330 }
331 outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
332 }
333
334 static void
335 hp_block_output(struct net_device *dev, int count,
336 const unsigned char *buf, int start_page)
337 {
338 int nic_base = dev->base_addr;
339 int saved_config = inb_p(nic_base - NIC_OFFSET + HP_CONFIGURE);
340
341 outb_p(saved_config | HP_DATAON, nic_base - NIC_OFFSET + HP_CONFIGURE);
342 /* Round the count up for word writes. Do we need to do this?
343 What effect will an odd byte count have on the 8390?
344 I should check someday. */
345 if (ei_status.word16 && (count & 0x01))
346 count++;
347 /* We should already be in page 0, but to be safe... */
348 outb_p(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base);
349
350 #ifdef NE8390_RW_BUGFIX
351 /* Handle the read-before-write bug the same way as the
352 Crynwr packet driver -- the NatSemi method doesn't work. */
353 outb_p(0x42, nic_base + EN0_RCNTLO);
354 outb_p(0, nic_base + EN0_RCNTHI);
355 outb_p(0xff, nic_base + EN0_RSARLO);
356 outb_p(0x00, nic_base + EN0_RSARHI);
357 #define NE_CMD 0x00
358 outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
359 /* Make certain that the dummy read has occurred. */
360 inb_p(0x61);
361 inb_p(0x61);
362 #endif
363
364 outb_p(count & 0xff, nic_base + EN0_RCNTLO);
365 outb_p(count >> 8, nic_base + EN0_RCNTHI);
366 outb_p(0x00, nic_base + EN0_RSARLO);
367 outb_p(start_page, nic_base + EN0_RSARHI);
368
369 outb_p(E8390_RWRITE+E8390_START, nic_base);
370 if (ei_status.word16) {
371 /* Use the 'rep' sequence for 16 bit boards. */
372 outsw(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count>>1);
373 } else {
374 outsb(nic_base - NIC_OFFSET + HP_DATAPORT, buf, count);
375 }
376
377 /* DON'T check for 'inb_p(EN0_ISR) & ENISR_RDC' here -- it's broken! */
378
379 /* This is for the ALPHA version only, remove for later releases. */
380 if (ei_debug > 0) { /* DMA termination address check... */
381 int high = inb_p(nic_base + EN0_RSARHI);
382 int low = inb_p(nic_base + EN0_RSARLO);
383 int addr = (high << 8) + low;
384 if ((start_page << 8) + count != addr)
385 printk("%s: TX Transfer address mismatch, %#4.4x vs. %#4.4x.\n",
386 dev->name, (start_page << 8) + count, addr);
387 }
388 outb_p(saved_config & (~HP_DATAON), nic_base - NIC_OFFSET + HP_CONFIGURE);
389 return;
390 }
391
392 /* This function resets the ethercard if something screws up. */
393 static void
394 hp_init_card(struct net_device *dev)
395 {
396 int irq = dev->irq;
397 NS8390_init(dev, 0);
398 outb_p(irqmap[irq&0x0f] | HP_RUN,
399 dev->base_addr - NIC_OFFSET + HP_CONFIGURE);
400 return;
401 }
402
403 #ifdef MODULE
404 #define MAX_HP_CARDS 4 /* Max number of HP cards per module */
405 static struct net_device *dev_hp[MAX_HP_CARDS];
406 static int io[MAX_HP_CARDS];
407 static int irq[MAX_HP_CARDS];
408
409 module_param_array(io, int, NULL, 0);
410 module_param_array(irq, int, NULL, 0);
411 MODULE_PARM_DESC(io, "I/O base address(es)");
412 MODULE_PARM_DESC(irq, "IRQ number(s) (assigned)");
413 MODULE_DESCRIPTION("HP PC-LAN ISA ethernet driver");
414 MODULE_LICENSE("GPL");
415
416 /* This is set up so that only a single autoprobe takes place per call.
417 ISA device autoprobes on a running machine are not recommended. */
418 int
419 init_module(void)
420 {
421 struct net_device *dev;
422 int this_dev, found = 0;
423
424 for (this_dev = 0; this_dev < MAX_HP_CARDS; this_dev++) {
425 if (io[this_dev] == 0) {
426 if (this_dev != 0) break; /* only autoprobe 1st one */
427 printk(KERN_NOTICE "hp.c: Presently autoprobing (not recommended) for a single card.\n");
428 }
429 dev = alloc_ei_netdev();
430 if (!dev)
431 break;
432 dev->irq = irq[this_dev];
433 dev->base_addr = io[this_dev];
434 if (do_hp_probe(dev) == 0) {
435 dev_hp[found++] = dev;
436 continue;
437 }
438 free_netdev(dev);
439 printk(KERN_WARNING "hp.c: No HP card found (i/o = 0x%x).\n", io[this_dev]);
440 break;
441 }
442 if (found)
443 return 0;
444 return -ENXIO;
445 }
446
447 void
448 cleanup_module(void)
449 {
450 int this_dev;
451
452 for (this_dev = 0; this_dev < MAX_HP_CARDS; this_dev++) {
453 struct net_device *dev = dev_hp[this_dev];
454 if (dev) {
455 unregister_netdev(dev);
456 cleanup_card(dev);
457 free_netdev(dev);
458 }
459 }
460 }
461 #endif /* MODULE */
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