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Initial commit
[wrt350n-kernel.git] / drivers / net / hp-plus.c
blobc2c4f49d7578955de11c6749423d331f786beec6
1 /* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */
2 /*
3 Written 1994 by Donald Becker.
4
5 This driver is for the Hewlett Packard PC LAN (27***) plus ethercards.
6 These cards are sold under several model numbers, usually 2724*.
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 As is often the case, a great deal of credit is owed to Russ Nelson.
17 The Crynwr packet driver was my primary source of HP-specific
18 programming information.
19 */
20
21 static const char version[] =
22 "hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
23
24 #include <linux/module.h>
25
26 #include <linux/string.h> /* Important -- this inlines word moves. */
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-plus"
41
42 /* A zero-terminated list of I/O addresses to be probed. */
43 static unsigned int hpplus_portlist[] __initdata =
44 {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
45
46 /*
47 The HP EtherTwist chip implementation is a fairly routine DP8390
48 implementation. It allows both shared memory and programmed-I/O buffer
49 access, using a custom interface for both. The programmed-I/O mode is
50 entirely implemented in the HP EtherTwist chip, bypassing the problem
51 ridden built-in 8390 facilities used on NE2000 designs. The shared
52 memory mode is likewise special, with an offset register used to make
53 packets appear at the shared memory base. Both modes use a base and bounds
54 page register to hide the Rx ring buffer wrap -- a packet that spans the
55 end of physical buffer memory appears continuous to the driver. (c.f. the
56 3c503 and Cabletron E2100)
57
58 A special note: the internal buffer of the board is only 8 bits wide.
59 This lays several nasty traps for the unaware:
60 - the 8390 must be programmed for byte-wide operations
61 - all I/O and memory operations must work on whole words (the access
62 latches are serially preloaded and have no byte-swapping ability).
63
64 This board is laid out in I/O space much like the earlier HP boards:
65 the first 16 locations are for the board registers, and the second 16 are
66 for the 8390. The board is easy to identify, with both a dedicated 16 bit
67 ID register and a constant 0x530* value in the upper bits of the paging
68 register.
69 */
70
71 #define HP_ID 0x00 /* ID register, always 0x4850. */
72 #define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */
73 #define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */
74 #define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */
75 #define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */
76 #define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */
77 #define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */
78 #define HP_IO_EXTENT 32
79
80 #define HP_START_PG 0x00 /* First page of TX buffer */
81 #define HP_STOP_PG 0x80 /* Last page +1 of RX ring */
82
83 /* The register set selected in HP_PAGING. */
84 enum PageName {
85 Perf_Page = 0, /* Normal operation. */
86 MAC_Page = 1, /* The ethernet address (+checksum). */
87 HW_Page = 2, /* EEPROM-loaded hardware parameters. */
88 LAN_Page = 4, /* Transceiver selection, testing, etc. */
89 ID_Page = 6 };
90
91 /* The bit definitions for the HPP_OPTION register. */
92 enum HP_Option {
93 NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */
94 EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
95 MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };
96
97 static int hpp_probe1(struct net_device *dev, int ioaddr);
98
99 static void hpp_reset_8390(struct net_device *dev);
100 static int hpp_open(struct net_device *dev);
101 static int hpp_close(struct net_device *dev);
102 static void hpp_mem_block_input(struct net_device *dev, int count,
103 struct sk_buff *skb, int ring_offset);
104 static void hpp_mem_block_output(struct net_device *dev, int count,
105 const unsigned char *buf, int start_page);
106 static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
107 int ring_page);
108 static void hpp_io_block_input(struct net_device *dev, int count,
109 struct sk_buff *skb, int ring_offset);
110 static void hpp_io_block_output(struct net_device *dev, int count,
111 const unsigned char *buf, int start_page);
112 static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
113 int ring_page);
114
115
116 /* Probe a list of addresses for an HP LAN+ adaptor.
117 This routine is almost boilerplate. */
118
119 static int __init do_hpp_probe(struct net_device *dev)
120 {
121 int i;
122 int base_addr = dev->base_addr;
123 int irq = dev->irq;
124
125 if (base_addr > 0x1ff) /* Check a single specified location. */
126 return hpp_probe1(dev, base_addr);
127 else if (base_addr != 0) /* Don't probe at all. */
128 return -ENXIO;
129
130 for (i = 0; hpplus_portlist[i]; i++) {
131 if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
132 return 0;
133 dev->irq = irq;
134 }
135
136 return -ENODEV;
137 }
138
139 #ifndef MODULE
140 struct net_device * __init hp_plus_probe(int unit)
141 {
142 struct net_device *dev = alloc_ei_netdev();
143 int err;
144
145 if (!dev)
146 return ERR_PTR(-ENOMEM);
147
148 sprintf(dev->name, "eth%d", unit);
149 netdev_boot_setup_check(dev);
150
151 err = do_hpp_probe(dev);
152 if (err)
153 goto out;
154 return dev;
155 out:
156 free_netdev(dev);
157 return ERR_PTR(err);
158 }
159 #endif
160
161 /* Do the interesting part of the probe at a single address. */
162 static int __init hpp_probe1(struct net_device *dev, int ioaddr)
163 {
164 int i, retval;
165 unsigned char checksum = 0;
166 const char name[] = "HP-PC-LAN+";
167 int mem_start;
168 static unsigned version_printed;
169 DECLARE_MAC_BUF(mac);
170
171 if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
172 return -EBUSY;
173
174 /* Check for the HP+ signature, 50 48 0x 53. */
175 if (inw(ioaddr + HP_ID) != 0x4850
176 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
177 retval = -ENODEV;
178 goto out;
179 }
180
181 if (ei_debug && version_printed++ == 0)
182 printk(version);
183
184 printk("%s: %s at %#3x, ", dev->name, name, ioaddr);
185
186 /* Retrieve and checksum the station address. */
187 outw(MAC_Page, ioaddr + HP_PAGING);
188
189 for(i = 0; i < ETHER_ADDR_LEN; i++) {
190 unsigned char inval = inb(ioaddr + 8 + i);
191 dev->dev_addr[i] = inval;
192 checksum += inval;
193 }
194 checksum += inb(ioaddr + 14);
195
196 printk("%s", print_mac(mac, dev->dev_addr));
197
198 if (checksum != 0xff) {
199 printk(" bad checksum %2.2x.\n", checksum);
200 retval = -ENODEV;
201 goto out;
202 } else {
203 /* Point at the Software Configuration Flags. */
204 outw(ID_Page, ioaddr + HP_PAGING);
205 printk(" ID %4.4x", inw(ioaddr + 12));
206 }
207
208 /* Read the IRQ line. */
209 outw(HW_Page, ioaddr + HP_PAGING);
210 {
211 int irq = inb(ioaddr + 13) & 0x0f;
212 int option = inw(ioaddr + HPP_OPTION);
213
214 dev->irq = irq;
215 if (option & MemEnable) {
216 mem_start = inw(ioaddr + 9) << 8;
217 printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
218 } else {
219 mem_start = 0;
220 printk(", IRQ %d, programmed-I/O mode.\n", irq);
221 }
222 }
223
224 /* Set the wrap registers for string I/O reads. */
225 outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
226
227 /* Set the base address to point to the NIC, not the "real" base! */
228 dev->base_addr = ioaddr + NIC_OFFSET;
229
230 dev->open = &hpp_open;
231 dev->stop = &hpp_close;
232 #ifdef CONFIG_NET_POLL_CONTROLLER
233 dev->poll_controller = ei_poll;
234 #endif
235
236 ei_status.name = name;
237 ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */
238 ei_status.tx_start_page = HP_START_PG;
239 ei_status.rx_start_page = HP_START_PG + TX_PAGES/2;
240 ei_status.stop_page = HP_STOP_PG;
241
242 ei_status.reset_8390 = &hpp_reset_8390;
243 ei_status.block_input = &hpp_io_block_input;
244 ei_status.block_output = &hpp_io_block_output;
245 ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
246
247 /* Check if the memory_enable flag is set in the option register. */
248 if (mem_start) {
249 ei_status.block_input = &hpp_mem_block_input;
250 ei_status.block_output = &hpp_mem_block_output;
251 ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
252 dev->mem_start = mem_start;
253 ei_status.mem = ioremap(mem_start,
254 (HP_STOP_PG - HP_START_PG)*256);
255 if (!ei_status.mem) {
256 retval = -ENOMEM;
257 goto out;
258 }
259 ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256;
260 dev->mem_end = ei_status.rmem_end
261 = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
262 }
263
264 outw(Perf_Page, ioaddr + HP_PAGING);
265 NS8390_init(dev, 0);
266 /* Leave the 8390 and HP chip reset. */
267 outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
268
269 retval = register_netdev(dev);
270 if (retval)
271 goto out1;
272 return 0;
273 out1:
274 iounmap(ei_status.mem);
275 out:
276 release_region(ioaddr, HP_IO_EXTENT);
277 return retval;
278 }
279
280 static int
281 hpp_open(struct net_device *dev)
282 {
283 int ioaddr = dev->base_addr - NIC_OFFSET;
284 int option_reg;
285 int retval;
286
287 if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev))) {
288 return retval;
289 }
290
291 /* Reset the 8390 and HP chip. */
292 option_reg = inw(ioaddr + HPP_OPTION);
293 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
294 udelay(5);
295 /* Unreset the board and enable interrupts. */
296 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
297
298 /* Set the wrap registers for programmed-I/O operation. */
299 outw(HW_Page, ioaddr + HP_PAGING);
300 outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
301
302 /* Select the operational page. */
303 outw(Perf_Page, ioaddr + HP_PAGING);
304
305 ei_open(dev);
306 return 0;
307 }
308
309 static int
310 hpp_close(struct net_device *dev)
311 {
312 int ioaddr = dev->base_addr - NIC_OFFSET;
313 int option_reg = inw(ioaddr + HPP_OPTION);
314
315 free_irq(dev->irq, dev);
316 ei_close(dev);
317 outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
318 ioaddr + HPP_OPTION);
319
320 return 0;
321 }
322
323 static void
324 hpp_reset_8390(struct net_device *dev)
325 {
326 int ioaddr = dev->base_addr - NIC_OFFSET;
327 int option_reg = inw(ioaddr + HPP_OPTION);
328
329 if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
330
331 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
332 /* Pause a few cycles for the hardware reset to take place. */
333 udelay(5);
334 ei_status.txing = 0;
335 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
336
337 udelay(5);
338
339
340 if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
341 printk("%s: hp_reset_8390() did not complete.\n", dev->name);
342
343 if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
344 return;
345 }
346
347 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
348 Note that transfer with the EtherTwist+ must be on word boundaries. */
349
350 static void
351 hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
352 {
353 int ioaddr = dev->base_addr - NIC_OFFSET;
354
355 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
356 insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
357 }
358
359 /* Block input and output, similar to the Crynwr packet driver. */
360
361 static void
362 hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
363 {
364 int ioaddr = dev->base_addr - NIC_OFFSET;
365 char *buf = skb->data;
366
367 outw(ring_offset, ioaddr + HPP_IN_ADDR);
368 insw(ioaddr + HP_DATAPORT, buf, count>>1);
369 if (count & 0x01)
370 buf[count-1] = inw(ioaddr + HP_DATAPORT);
371 }
372
373 /* The corresponding shared memory versions of the above 2 functions. */
374
375 static void
376 hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
377 {
378 int ioaddr = dev->base_addr - NIC_OFFSET;
379 int option_reg = inw(ioaddr + HPP_OPTION);
380
381 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
382 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
383 memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr));
384 outw(option_reg, ioaddr + HPP_OPTION);
385 hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */
386 }
387
388 static void
389 hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
390 {
391 int ioaddr = dev->base_addr - NIC_OFFSET;
392 int option_reg = inw(ioaddr + HPP_OPTION);
393
394 outw(ring_offset, ioaddr + HPP_IN_ADDR);
395
396 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
397
398 /* Caution: this relies on get_8390_hdr() rounding up count!
399 Also note that we *can't* use eth_io_copy_and_sum() because
400 it will not always copy "count" bytes (e.g. padded IP). */
401
402 memcpy_fromio(skb->data, ei_status.mem, count);
403 outw(option_reg, ioaddr + HPP_OPTION);
404 }
405
406 /* A special note: we *must* always transfer >=16 bit words.
407 It's always safe to round up, so we do. */
408 static void
409 hpp_io_block_output(struct net_device *dev, int count,
410 const unsigned char *buf, int start_page)
411 {
412 int ioaddr = dev->base_addr - NIC_OFFSET;
413 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
414 outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
415 return;
416 }
417
418 static void
419 hpp_mem_block_output(struct net_device *dev, int count,
420 const unsigned char *buf, int start_page)
421 {
422 int ioaddr = dev->base_addr - NIC_OFFSET;
423 int option_reg = inw(ioaddr + HPP_OPTION);
424
425 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
426 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
427 memcpy_toio(ei_status.mem, buf, (count + 3) & ~3);
428 outw(option_reg, ioaddr + HPP_OPTION);
429
430 return;
431 }
432
433
434 #ifdef MODULE
435 #define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
436 static struct net_device *dev_hpp[MAX_HPP_CARDS];
437 static int io[MAX_HPP_CARDS];
438 static int irq[MAX_HPP_CARDS];
439
440 module_param_array(io, int, NULL, 0);
441 module_param_array(irq, int, NULL, 0);
442 MODULE_PARM_DESC(io, "I/O port address(es)");
443 MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
444 MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
445 MODULE_LICENSE("GPL");
446
447 /* This is set up so that only a single autoprobe takes place per call.
448 ISA device autoprobes on a running machine are not recommended. */
449 int __init
450 init_module(void)
451 {
452 struct net_device *dev;
453 int this_dev, found = 0;
454
455 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
456 if (io[this_dev] == 0) {
457 if (this_dev != 0) break; /* only autoprobe 1st one */
458 printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
459 }
460 dev = alloc_ei_netdev();
461 if (!dev)
462 break;
463 dev->irq = irq[this_dev];
464 dev->base_addr = io[this_dev];
465 if (do_hpp_probe(dev) == 0) {
466 dev_hpp[found++] = dev;
467 continue;
468 }
469 free_netdev(dev);
470 printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
471 break;
472 }
473 if (found)
474 return 0;
475 return -ENXIO;
476 }
477
478 static void cleanup_card(struct net_device *dev)
479 {
480 /* NB: hpp_close() handles free_irq */
481 iounmap(ei_status.mem);
482 release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
483 }
484
485 void __exit
486 cleanup_module(void)
487 {
488 int this_dev;
489
490 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
491 struct net_device *dev = dev_hpp[this_dev];
492 if (dev) {
493 unregister_netdev(dev);
494 cleanup_card(dev);
495 free_netdev(dev);
496 }
497 }
498 }
499 #endif /* MODULE */
WRT350N Kernel Patches