1 /* e2100.c: A Cabletron E2100 series ethernet driver for linux. */
2 /*
3 Written 1993-1994 by Donald Becker.
4
5 Copyright 1994 by Donald Becker.
6 Copyright 1993 United States Government as represented by the
7 Director, National Security Agency. This software may be used and
8 distributed according to the terms of the GNU General Public License,
9 incorporated herein by reference.
10
11 This is a driver for the Cabletron E2100 series ethercards.
12
13 The Author may be reached as becker@scyld.com, or C/O
14 Scyld Computing Corporation
15 410 Severn Ave., Suite 210
16 Annapolis MD 21403
17
18 The E2100 series ethercard is a fairly generic shared memory 8390
19 implementation. The only unusual aspect is the way the shared memory
20 registers are set: first you do an inb() in what is normally the
21 station address region, and the low three bits of next outb() *address*
22 is used as the write value for that register. Either someone wasn't
23 too used to dem bit en bites, or they were trying to obfuscate the
24 programming interface.
25
26 There is an additional complication when setting the window on the packet
27 buffer. You must first do a read into the packet buffer region with the
28 low 8 address bits the address setting the page for the start of the packet
29 buffer window, and then do the above operation. See mem_on() for details.
30
31 One bug on the chip is that even a hard reset won't disable the memory
32 window, usually resulting in a hung machine if mem_off() isn't called.
33 If this happens, you must power down the machine for about 30 seconds.
34 */
35
36 static const char version[] =
37 "e2100.c:v1.01 7/21/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
38
39 #include <linux/module.h>
40 #include <linux/kernel.h>
41 #include <linux/errno.h>
42 #include <linux/string.h>
43 #include <linux/ioport.h>
44 #include <linux/netdevice.h>
45 #include <linux/etherdevice.h>
46 #include <linux/init.h>
47 #include <linux/interrupt.h>
48 #include <linux/delay.h>
49
50 #include <asm/io.h>
51
52 #include "8390.h"
53
54 #define DRV_NAME "e2100"
55
56 static int e21_probe_list[] = {0x300, 0x280, 0x380, 0x220, 0};
57
58 /* Offsets from the base_addr.
59 Read from the ASIC register, and the low three bits of the next outb()
60 address is used to set the corresponding register. */
61 #define E21_NIC_OFFSET 0 /* Offset to the 8390 NIC. */
62 #define E21_ASIC 0x10
63 #define E21_MEM_ENABLE 0x10
64 #define E21_MEM_ON 0x05 /* Enable memory in 16 bit mode. */
65 #define E21_MEM_ON_8 0x07 /* Enable memory in 8 bit mode. */
66 #define E21_MEM_BASE 0x11
67 #define E21_IRQ_LOW 0x12 /* The low three bits of the IRQ number. */
68 #define E21_IRQ_HIGH 0x14 /* The high IRQ bit and media select ... */
69 #define E21_MEDIA 0x14 /* (alias). */
70 #define E21_ALT_IFPORT 0x02 /* Set to use the other (BNC,AUI) port. */
71 #define E21_BIG_MEM 0x04 /* Use a bigger (64K) buffer (we don't) */
72 #define E21_SAPROM 0x10 /* Offset to station address data. */
73 #define E21_IO_EXTENT 0x20
74
mem_on(short port,volatile char __iomem * mem_base,unsigned char start_page)75 static inline void mem_on(short port, volatile char __iomem *mem_base,
76 unsigned char start_page )
77 {
78 /* This is a little weird: set the shared memory window by doing a
79 read. The low address bits specify the starting page. */
80 readb(mem_base+start_page);
81 inb(port + E21_MEM_ENABLE);
82 outb(E21_MEM_ON, port + E21_MEM_ENABLE + E21_MEM_ON);
83 }
84
mem_off(short port)85 static inline void mem_off(short port)
86 {
87 inb(port + E21_MEM_ENABLE);
88 outb(0x00, port + E21_MEM_ENABLE);
89 }
90
91 /* In other drivers I put the TX pages first, but the E2100 window circuitry
92 is designed to have a 4K Tx region last. The windowing circuitry wraps the
93 window at 0x2fff->0x0000 so that the packets at e.g. 0x2f00 in the RX ring
94 appear contiguously in the window. */
95 #define E21_RX_START_PG 0x00 /* First page of RX buffer */
96 #define E21_RX_STOP_PG 0x30 /* Last page +1 of RX ring */
97 #define E21_BIG_RX_STOP_PG 0xF0 /* Last page +1 of RX ring */
98 #define E21_TX_START_PG E21_RX_STOP_PG /* First page of TX buffer */
99
100 static int e21_probe1(struct net_device *dev, int ioaddr);
101
102 static int e21_open(struct net_device *dev);
103 static void e21_reset_8390(struct net_device *dev);
104 static void e21_block_input(struct net_device *dev, int count,
105 struct sk_buff *skb, int ring_offset);
106 static void e21_block_output(struct net_device *dev, int count,
107 const unsigned char *buf, int start_page);
108 static void e21_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
109 int ring_page);
110 static int e21_open(struct net_device *dev);
111 static int e21_close(struct net_device *dev);
112
113
114 /* Probe for the E2100 series ethercards. These cards have an 8390 at the
115 base address and the station address at both offset 0x10 and 0x18. I read
116 the station address from offset 0x18 to avoid the dataport of NE2000
117 ethercards, and look for Ctron's unique ID (first three octets of the
118 station address).
119 */
120
do_e2100_probe(struct net_device * dev)121 static int __init do_e2100_probe(struct net_device *dev)
122 {
123 int *port;
124 int base_addr = dev->base_addr;
125 int irq = dev->irq;
126
127 if (base_addr > 0x1ff) /* Check a single specified location. */
128 return e21_probe1(dev, base_addr);
129 else if (base_addr != 0) /* Don't probe at all. */
130 return -ENXIO;
131
132 for (port = e21_probe_list; *port; port++) {
133 dev->irq = irq;
134 if (e21_probe1(dev, *port) == 0)
135 return 0;
136 }
137
138 return -ENODEV;
139 }
140
141 #ifndef MODULE
e2100_probe(int unit)142 struct net_device * __init e2100_probe(int unit)
143 {
144 struct net_device *dev = alloc_ei_netdev();
145 int err;
146
147 if (!dev)
148 return ERR_PTR(-ENOMEM);
149
150 sprintf(dev->name, "eth%d", unit);
151 netdev_boot_setup_check(dev);
152
153 err = do_e2100_probe(dev);
154 if (err)
155 goto out;
156 return dev;
157 out:
158 free_netdev(dev);
159 return ERR_PTR(err);
160 }
161 #endif
162
163 static const struct net_device_ops e21_netdev_ops = {
164 .ndo_open = e21_open,
165 .ndo_stop = e21_close,
166
167 .ndo_start_xmit = ei_start_xmit,
168 .ndo_tx_timeout = ei_tx_timeout,
169 .ndo_get_stats = ei_get_stats,
170 .ndo_set_rx_mode = ei_set_multicast_list,
171 .ndo_validate_addr = eth_validate_addr,
172 .ndo_set_mac_address = eth_mac_addr,
173 .ndo_change_mtu = eth_change_mtu,
174 #ifdef CONFIG_NET_POLL_CONTROLLER
175 .ndo_poll_controller = ei_poll,
176 #endif
177 };
178
e21_probe1(struct net_device * dev,int ioaddr)179 static int __init e21_probe1(struct net_device *dev, int ioaddr)
180 {
181 int i, status, retval;
182 unsigned char *station_addr = dev->dev_addr;
183 static unsigned version_printed;
184
185 if (!request_region(ioaddr, E21_IO_EXTENT, DRV_NAME))
186 return -EBUSY;
187
188 /* First check the station address for the Ctron prefix. */
189 if (inb(ioaddr + E21_SAPROM + 0) != 0x00 ||
190 inb(ioaddr + E21_SAPROM + 1) != 0x00 ||
191 inb(ioaddr + E21_SAPROM + 2) != 0x1d) {
192 retval = -ENODEV;
193 goto out;
194 }
195
196 /* Verify by making certain that there is a 8390 at there. */
197 outb(E8390_NODMA + E8390_STOP, ioaddr);
198 udelay(1); /* we want to delay one I/O cycle - which is 2MHz */
199 status = inb(ioaddr);
200 if (status != 0x21 && status != 0x23) {
201 retval = -ENODEV;
202 goto out;
203 }
204
205 /* Read the station address PROM. */
206 for (i = 0; i < 6; i++)
207 station_addr[i] = inb(ioaddr + E21_SAPROM + i);
208
209 inb(ioaddr + E21_MEDIA); /* Point to media selection. */
210 outb(0, ioaddr + E21_ASIC); /* and disable the secondary interface. */
211
212 if (ei_debug && version_printed++ == 0)
213 printk(version);
214
215 for (i = 0; i < 6; i++)
216 printk(" %02X", station_addr[i]);
217
218 if (dev->irq < 2) {
219 static const int irqlist[] = {15, 11, 10, 12, 5, 9, 3, 4};
220 for (i = 0; i < ARRAY_SIZE(irqlist); i++)
221 if (request_irq (irqlist[i], NULL, 0, "bogus", NULL) != -EBUSY) {
222 dev->irq = irqlist[i];
223 break;
224 }
225 if (i >= ARRAY_SIZE(irqlist)) {
226 printk(" unable to get IRQ %d.\n", dev->irq);
227 retval = -EAGAIN;
228 goto out;
229 }
230 } else if (dev->irq == 2) /* Fixup luser bogosity: IRQ2 is really IRQ9 */
231 dev->irq = 9;
232
233 /* The 8390 is at the base address. */
234 dev->base_addr = ioaddr;
235
236 ei_status.name = "E2100";
237 ei_status.word16 = 1;
238 ei_status.tx_start_page = E21_TX_START_PG;
239 ei_status.rx_start_page = E21_RX_START_PG;
240 ei_status.stop_page = E21_RX_STOP_PG;
241 ei_status.saved_irq = dev->irq;
242
243 /* Check the media port used. The port can be passed in on the
244 low mem_end bits. */
245 if (dev->mem_end & 15)
246 dev->if_port = dev->mem_end & 7;
247 else {
248 dev->if_port = 0;
249 inb(ioaddr + E21_MEDIA); /* Turn automatic media detection on. */
250 for(i = 0; i < 6; i++)
251 if (station_addr[i] != inb(ioaddr + E21_SAPROM + 8 + i)) {
252 dev->if_port = 1;
253 break;
254 }
255 }
256
257 /* Never map in the E21 shared memory unless you are actively using it.
258 Also, the shared memory has effective only one setting -- spread all
259 over the 128K region! */
260 if (dev->mem_start == 0)
261 dev->mem_start = 0xd0000;
262
263 ei_status.mem = ioremap(dev->mem_start, 2*1024);
264 if (!ei_status.mem) {
265 printk("unable to remap memory\n");
266 retval = -EAGAIN;
267 goto out;
268 }
269
270 #ifdef notdef
271 /* These values are unused. The E2100 has a 2K window into the packet
272 buffer. The window can be set to start on any page boundary. */
273 ei_status.rmem_start = dev->mem_start + TX_PAGES*256;
274 dev->mem_end = ei_status.rmem_end = dev->mem_start + 2*1024;
275 #endif
276
277 printk(", IRQ %d, %s media, memory @ %#lx.\n", dev->irq,
278 dev->if_port ? "secondary" : "primary", dev->mem_start);
279
280 ei_status.reset_8390 = &e21_reset_8390;
281 ei_status.block_input = &e21_block_input;
282 ei_status.block_output = &e21_block_output;
283 ei_status.get_8390_hdr = &e21_get_8390_hdr;
284
285 dev->netdev_ops = &e21_netdev_ops;
286 NS8390_init(dev, 0);
287
288 retval = register_netdev(dev);
289 if (retval)
290 goto out;
291 return 0;
292 out:
293 release_region(ioaddr, E21_IO_EXTENT);
294 return retval;
295 }
296
297 static int
e21_open(struct net_device * dev)298 e21_open(struct net_device *dev)
299 {
300 short ioaddr = dev->base_addr;
301 int retval;
302
303 if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev)))
304 return retval;
305
306 /* Set the interrupt line and memory base on the hardware. */
307 inb(ioaddr + E21_IRQ_LOW);
308 outb(0, ioaddr + E21_ASIC + (dev->irq & 7));
309 inb(ioaddr + E21_IRQ_HIGH); /* High IRQ bit, and if_port. */
310 outb(0, ioaddr + E21_ASIC + (dev->irq > 7 ? 1:0)
311 + (dev->if_port ? E21_ALT_IFPORT : 0));
312 inb(ioaddr + E21_MEM_BASE);
313 outb(0, ioaddr + E21_ASIC + ((dev->mem_start >> 17) & 7));
314
315 ei_open(dev);
316 return 0;
317 }
318
319 static void
e21_reset_8390(struct net_device * dev)320 e21_reset_8390(struct net_device *dev)
321 {
322 short ioaddr = dev->base_addr;
323
324 outb(0x01, ioaddr);
325 if (ei_debug > 1) printk("resetting the E2180x3 t=%ld...", jiffies);
326 ei_status.txing = 0;
327
328 /* Set up the ASIC registers, just in case something changed them. */
329
330 if (ei_debug > 1) printk("reset done\n");
331 }
332
333 /* Grab the 8390 specific header. We put the 2k window so the header page
334 appears at the start of the shared memory. */
335
336 static void
e21_get_8390_hdr(struct net_device * dev,struct e8390_pkt_hdr * hdr,int ring_page)337 e21_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
338 {
339
340 short ioaddr = dev->base_addr;
341 char __iomem *shared_mem = ei_status.mem;
342
343 mem_on(ioaddr, shared_mem, ring_page);
344
345 #ifdef notdef
346 /* Officially this is what we are doing, but the readl() is faster */
347 memcpy_fromio(hdr, shared_mem, sizeof(struct e8390_pkt_hdr));
348 #else
349 ((unsigned int*)hdr)[0] = readl(shared_mem);
350 #endif
351
352 /* Turn off memory access: we would need to reprogram the window anyway. */
353 mem_off(ioaddr);
354
355 }
356
357 /* Block input and output are easy on shared memory ethercards.
358 The E21xx makes block_input() especially easy by wrapping the top
359 ring buffer to the bottom automatically. */
360 static void
e21_block_input(struct net_device * dev,int count,struct sk_buff * skb,int ring_offset)361 e21_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
362 {
363 short ioaddr = dev->base_addr;
364 char __iomem *shared_mem = ei_status.mem;
365
366 mem_on(ioaddr, shared_mem, (ring_offset>>8));
367
368 memcpy_fromio(skb->data, ei_status.mem + (ring_offset & 0xff), count);
369
370 mem_off(ioaddr);
371 }
372
373 static void
e21_block_output(struct net_device * dev,int count,const unsigned char * buf,int start_page)374 e21_block_output(struct net_device *dev, int count, const unsigned char *buf,
375 int start_page)
376 {
377 short ioaddr = dev->base_addr;
378 volatile char __iomem *shared_mem = ei_status.mem;
379
380 /* Set the shared memory window start by doing a read, with the low address
381 bits specifying the starting page. */
382 readb(shared_mem + start_page);
383 mem_on(ioaddr, shared_mem, start_page);
384
385 memcpy_toio(shared_mem, buf, count);
386 mem_off(ioaddr);
387 }
388
389 static int
e21_close(struct net_device * dev)390 e21_close(struct net_device *dev)
391 {
392 short ioaddr = dev->base_addr;
393
394 if (ei_debug > 1)
395 printk("%s: Shutting down ethercard.\n", dev->name);
396
397 free_irq(dev->irq, dev);
398 dev->irq = ei_status.saved_irq;
399
400 /* Shut off the interrupt line and secondary interface. */
401 inb(ioaddr + E21_IRQ_LOW);
402 outb(0, ioaddr + E21_ASIC);
403 inb(ioaddr + E21_IRQ_HIGH); /* High IRQ bit, and if_port. */
404 outb(0, ioaddr + E21_ASIC);
405
406 ei_close(dev);
407
408 /* Double-check that the memory has been turned off, because really
409 really bad things happen if it isn't. */
410 mem_off(ioaddr);
411
412 return 0;
413 }
414
415
416 #ifdef MODULE
417 #define MAX_E21_CARDS 4 /* Max number of E21 cards per module */
418 static struct net_device *dev_e21[MAX_E21_CARDS];
419 static int io[MAX_E21_CARDS];
420 static int irq[MAX_E21_CARDS];
421 static int mem[MAX_E21_CARDS];
422 static int xcvr[MAX_E21_CARDS]; /* choose int. or ext. xcvr */
423
424 module_param_array(io, int, NULL, 0);
425 module_param_array(irq, int, NULL, 0);
426 module_param_array(mem, int, NULL, 0);
427 module_param_array(xcvr, int, NULL, 0);
428 MODULE_PARM_DESC(io, "I/O base address(es)");
429 MODULE_PARM_DESC(irq, "IRQ number(s)");
430 MODULE_PARM_DESC(mem, " memory base address(es)");
431 MODULE_PARM_DESC(xcvr, "transceiver(s) (0=internal, 1=external)");
432 MODULE_DESCRIPTION("Cabletron E2100 ISA ethernet driver");
433 MODULE_LICENSE("GPL");
434
435 /* This is set up so that only a single autoprobe takes place per call.
436 ISA device autoprobes on a running machine are not recommended. */
437
init_module(void)438 int __init init_module(void)
439 {
440 struct net_device *dev;
441 int this_dev, found = 0;
442
443 for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) {
444 if (io[this_dev] == 0) {
445 if (this_dev != 0) break; /* only autoprobe 1st one */
446 printk(KERN_NOTICE "e2100.c: Presently autoprobing (not recommended) for a single card.\n");
447 }
448 dev = alloc_ei_netdev();
449 if (!dev)
450 break;
451 dev->irq = irq[this_dev];
452 dev->base_addr = io[this_dev];
453 dev->mem_start = mem[this_dev];
454 dev->mem_end = xcvr[this_dev]; /* low 4bits = xcvr sel. */
455 if (do_e2100_probe(dev) == 0) {
456 dev_e21[found++] = dev;
457 continue;
458 }
459 free_netdev(dev);
460 printk(KERN_WARNING "e2100.c: No E2100 card found (i/o = 0x%x).\n", io[this_dev]);
461 break;
462 }
463 if (found)
464 return 0;
465 return -ENXIO;
466 }
467
cleanup_card(struct net_device * dev)468 static void cleanup_card(struct net_device *dev)
469 {
470 /* NB: e21_close() handles free_irq */
471 iounmap(ei_status.mem);
472 release_region(dev->base_addr, E21_IO_EXTENT);
473 }
474
475 void __exit
cleanup_module(void)476 cleanup_module(void)
477 {
478 int this_dev;
479
480 for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) {
481 struct net_device *dev = dev_e21[this_dev];
482 if (dev) {
483 unregister_netdev(dev);
484 cleanup_card(dev);
485 free_netdev(dev);
486 }
487 }
488 }
489 #endif /* MODULE */
490