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