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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/e2100.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/net/e2100.c')
-rw-r--r--drivers/net/e2100.c485
1 files changed, 485 insertions, 0 deletions
diff --git a/drivers/net/e2100.c b/drivers/net/e2100.c
new file mode 100644
index 000000000000..51c9fa260830
--- /dev/null
+++ b/drivers/net/e2100.c
@@ -0,0 +1,485 @@
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/delay.h>
48
49#include <asm/io.h>
50#include <asm/system.h>
51
52#include "8390.h"
53
54#define DRV_NAME "e2100"
55
56static 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
75static 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
85static 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
100static int e21_probe1(struct net_device *dev, int ioaddr);
101
102static int e21_open(struct net_device *dev);
103static void e21_reset_8390(struct net_device *dev);
104static void e21_block_input(struct net_device *dev, int count,
105 struct sk_buff *skb, int ring_offset);
106static void e21_block_output(struct net_device *dev, int count,
107 const unsigned char *buf, int start_page);
108static void e21_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
109 int ring_page);
110
111static 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
121static 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 SET_MODULE_OWNER(dev);
128
129 if (base_addr > 0x1ff) /* Check a single specified location. */
130 return e21_probe1(dev, base_addr);
131 else if (base_addr != 0) /* Don't probe at all. */
132 return -ENXIO;
133
134 for (port = e21_probe_list; *port; port++) {
135 dev->irq = irq;
136 if (e21_probe1(dev, *port) == 0)
137 return 0;
138 }
139
140 return -ENODEV;
141}
142
143static void cleanup_card(struct net_device *dev)
144{
145 /* NB: e21_close() handles free_irq */
146 iounmap(ei_status.mem);
147 release_region(dev->base_addr, E21_IO_EXTENT);
148}
149
150#ifndef MODULE
151struct net_device * __init e2100_probe(int unit)
152{
153 struct net_device *dev = alloc_ei_netdev();
154 int err;
155
156 if (!dev)
157 return ERR_PTR(-ENOMEM);
158
159 sprintf(dev->name, "eth%d", unit);
160 netdev_boot_setup_check(dev);
161
162 err = do_e2100_probe(dev);
163 if (err)
164 goto out;
165 err = register_netdev(dev);
166 if (err)
167 goto out1;
168 return dev;
169out1:
170 cleanup_card(dev);
171out:
172 free_netdev(dev);
173 return ERR_PTR(err);
174}
175#endif
176
177static int __init e21_probe1(struct net_device *dev, int ioaddr)
178{
179 int i, status, retval;
180 unsigned char *station_addr = dev->dev_addr;
181 static unsigned version_printed;
182
183 if (!request_region(ioaddr, E21_IO_EXTENT, DRV_NAME))
184 return -EBUSY;
185
186 /* First check the station address for the Ctron prefix. */
187 if (inb(ioaddr + E21_SAPROM + 0) != 0x00
188 || inb(ioaddr + E21_SAPROM + 1) != 0x00
189 || inb(ioaddr + E21_SAPROM + 2) != 0x1d) {
190 retval = -ENODEV;
191 goto out;
192 }
193
194 /* Verify by making certain that there is a 8390 at there. */
195 outb(E8390_NODMA + E8390_STOP, ioaddr);
196 udelay(1); /* we want to delay one I/O cycle - which is 2MHz */
197 status = inb(ioaddr);
198 if (status != 0x21 && status != 0x23) {
199 retval = -ENODEV;
200 goto out;
201 }
202
203 /* Read the station address PROM. */
204 for (i = 0; i < 6; i++)
205 station_addr[i] = inb(ioaddr + E21_SAPROM + i);
206
207 inb(ioaddr + E21_MEDIA); /* Point to media selection. */
208 outb(0, ioaddr + E21_ASIC); /* and disable the secondary interface. */
209
210 if (ei_debug && version_printed++ == 0)
211 printk(version);
212
213 for (i = 0; i < 6; i++)
214 printk(" %02X", station_addr[i]);
215
216 if (dev->irq < 2) {
217 int irqlist[] = {15,11,10,12,5,9,3,4}, i;
218 for (i = 0; i < 8; i++)
219 if (request_irq (irqlist[i], NULL, 0, "bogus", NULL) != -EBUSY) {
220 dev->irq = irqlist[i];
221 break;
222 }
223 if (i >= 8) {
224 printk(" unable to get IRQ %d.\n", dev->irq);
225 retval = -EAGAIN;
226 goto out;
227 }
228 } else if (dev->irq == 2) /* Fixup luser bogosity: IRQ2 is really IRQ9 */
229 dev->irq = 9;
230
231 /* The 8390 is at the base address. */
232 dev->base_addr = ioaddr;
233
234 ei_status.name = "E2100";
235 ei_status.word16 = 1;
236 ei_status.tx_start_page = E21_TX_START_PG;
237 ei_status.rx_start_page = E21_RX_START_PG;
238 ei_status.stop_page = E21_RX_STOP_PG;
239 ei_status.saved_irq = dev->irq;
240
241 /* Check the media port used. The port can be passed in on the
242 low mem_end bits. */
243 if (dev->mem_end & 15)
244 dev->if_port = dev->mem_end & 7;
245 else {
246 dev->if_port = 0;
247 inb(ioaddr + E21_MEDIA); /* Turn automatic media detection on. */
248 for(i = 0; i < 6; i++)
249 if (station_addr[i] != inb(ioaddr + E21_SAPROM + 8 + i)) {
250 dev->if_port = 1;
251 break;
252 }
253 }
254
255 /* Never map in the E21 shared memory unless you are actively using it.
256 Also, the shared memory has effective only one setting -- spread all
257 over the 128K region! */
258 if (dev->mem_start == 0)
259 dev->mem_start = 0xd0000;
260
261 ei_status.mem = ioremap(dev->mem_start, 2*1024);
262 if (!ei_status.mem) {
263 printk("unable to remap memory\n");
264 retval = -EAGAIN;
265 goto out;
266 }
267
268#ifdef notdef
269 /* These values are unused. The E2100 has a 2K window into the packet
270 buffer. The window can be set to start on any page boundary. */
271 ei_status.rmem_start = dev->mem_start + TX_PAGES*256;
272 dev->mem_end = ei_status.rmem_end = dev->mem_start + 2*1024;
273#endif
274
275 printk(", IRQ %d, %s media, memory @ %#lx.\n", dev->irq,
276 dev->if_port ? "secondary" : "primary", dev->mem_start);
277
278 ei_status.reset_8390 = &e21_reset_8390;
279 ei_status.block_input = &e21_block_input;
280 ei_status.block_output = &e21_block_output;
281 ei_status.get_8390_hdr = &e21_get_8390_hdr;
282 dev->open = &e21_open;
283 dev->stop = &e21_close;
284#ifdef CONFIG_NET_POLL_CONTROLLER
285 dev->poll_controller = ei_poll;
286#endif
287 NS8390_init(dev, 0);
288
289 return 0;
290out:
291 release_region(ioaddr, E21_IO_EXTENT);
292 return retval;
293}
294
295static int
296e21_open(struct net_device *dev)
297{
298 short ioaddr = dev->base_addr;
299 int retval;
300
301 if ((retval = request_irq(dev->irq, ei_interrupt, 0, dev->name, dev)))
302 return retval;
303
304 /* Set the interrupt line and memory base on the hardware. */
305 inb(ioaddr + E21_IRQ_LOW);
306 outb(0, ioaddr + E21_ASIC + (dev->irq & 7));
307 inb(ioaddr + E21_IRQ_HIGH); /* High IRQ bit, and if_port. */
308 outb(0, ioaddr + E21_ASIC + (dev->irq > 7 ? 1:0)
309 + (dev->if_port ? E21_ALT_IFPORT : 0));
310 inb(ioaddr + E21_MEM_BASE);
311 outb(0, ioaddr + E21_ASIC + ((dev->mem_start >> 17) & 7));
312
313 ei_open(dev);
314 return 0;
315}
316
317static void
318e21_reset_8390(struct net_device *dev)
319{
320 short ioaddr = dev->base_addr;
321
322 outb(0x01, ioaddr);
323 if (ei_debug > 1) printk("resetting the E2180x3 t=%ld...", jiffies);
324 ei_status.txing = 0;
325
326 /* Set up the ASIC registers, just in case something changed them. */
327
328 if (ei_debug > 1) printk("reset done\n");
329 return;
330}
331
332/* Grab the 8390 specific header. We put the 2k window so the header page
333 appears at the start of the shared memory. */
334
335static void
336e21_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
337{
338
339 short ioaddr = dev->base_addr;
340 char __iomem *shared_mem = ei_status.mem;
341
342 mem_on(ioaddr, shared_mem, ring_page);
343
344#ifdef notdef
345 /* Officially this is what we are doing, but the readl() is faster */
346 memcpy_fromio(hdr, shared_mem, sizeof(struct e8390_pkt_hdr));
347#else
348 ((unsigned int*)hdr)[0] = readl(shared_mem);
349#endif
350
351 /* Turn off memory access: we would need to reprogram the window anyway. */
352 mem_off(ioaddr);
353
354}
355
356/* Block input and output are easy on shared memory ethercards.
357 The E21xx makes block_input() especially easy by wrapping the top
358 ring buffer to the bottom automatically. */
359static void
360e21_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
361{
362 short ioaddr = dev->base_addr;
363 char __iomem *shared_mem = ei_status.mem;
364
365 mem_on(ioaddr, shared_mem, (ring_offset>>8));
366
367 /* Packet is always in one chunk -- we can copy + cksum. */
368 eth_io_copy_and_sum(skb, ei_status.mem + (ring_offset & 0xff), count, 0);
369
370 mem_off(ioaddr);
371}
372
373static void
374e21_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
389static int
390e21_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 */
418static struct net_device *dev_e21[MAX_E21_CARDS];
419static int io[MAX_E21_CARDS];
420static int irq[MAX_E21_CARDS];
421static int mem[MAX_E21_CARDS];
422static int xcvr[MAX_E21_CARDS]; /* choose int. or ext. xcvr */
423
424module_param_array(io, int, NULL, 0);
425module_param_array(irq, int, NULL, 0);
426module_param_array(mem, int, NULL, 0);
427module_param_array(xcvr, int, NULL, 0);
428MODULE_PARM_DESC(io, "I/O base address(es)");
429MODULE_PARM_DESC(irq, "IRQ number(s)");
430MODULE_PARM_DESC(mem, " memory base address(es)");
431MODULE_PARM_DESC(xcvr, "transceiver(s) (0=internal, 1=external)");
432MODULE_DESCRIPTION("Cabletron E2100 ISA ethernet driver");
433MODULE_LICENSE("GPL");
434
435/* This is set up so that only a single autoprobe takes place per call.
436ISA device autoprobes on a running machine are not recommended. */
437int
438init_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 if (register_netdev(dev) == 0) {
457 dev_e21[found++] = dev;
458 continue;
459 }
460 cleanup_card(dev);
461 }
462 free_netdev(dev);
463 printk(KERN_WARNING "e2100.c: No E2100 card found (i/o = 0x%x).\n", io[this_dev]);
464 break;
465 }
466 if (found)
467 return 0;
468 return -ENXIO;
469}
470
471void
472cleanup_module(void)
473{
474 int this_dev;
475
476 for (this_dev = 0; this_dev < MAX_E21_CARDS; this_dev++) {
477 struct net_device *dev = dev_e21[this_dev];
478 if (dev) {
479 unregister_netdev(dev);
480 cleanup_card(dev);
481 free_netdev(dev);
482 }
483 }
484}
485#endif /* MODULE */