1 /* e2100.c: A Cabletron E2100 series ethernet driver for linux. */
3 Written 1993-1994 by Donald Becker.
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.
11 This is a driver for the Cabletron E2100 series ethercards.
13 The Author may be reached as becker@scyld.com, or C/O
14 Scyld Computing Corporation
15 410 Severn Ave., Suite 210
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.
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.
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.
36 static const char version
[] =
37 "e2100.c:v1.01 7/21/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
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>
50 #include <asm/system.h>
54 #define DRV_NAME "e2100"
56 static int e21_probe_list
[] = {0x300, 0x280, 0x380, 0x220, 0};
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. */
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
75 static inline void mem_on(short port
, volatile char __iomem
*mem_base
,
76 unsigned char start_page
)
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
);
85 static inline void mem_off(short port
)
87 inb(port
+ E21_MEM_ENABLE
);
88 outb(0x00, port
+ E21_MEM_ENABLE
);
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 */
100 static int e21_probe1(struct net_device
*dev
, int ioaddr
);
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
,
111 static int e21_close(struct net_device
*dev
);
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
121 static int __init
do_e2100_probe(struct net_device
*dev
)
124 int base_addr
= dev
->base_addr
;
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. */
132 for (port
= e21_probe_list
; *port
; port
++) {
134 if (e21_probe1(dev
, *port
) == 0)
142 struct net_device
* __init
e2100_probe(int unit
)
144 struct net_device
*dev
= alloc_ei_netdev();
148 return ERR_PTR(-ENOMEM
);
150 sprintf(dev
->name
, "eth%d", unit
);
151 netdev_boot_setup_check(dev
);
153 err
= do_e2100_probe(dev
);
163 static int __init
e21_probe1(struct net_device
*dev
, int ioaddr
)
165 int i
, status
, retval
;
166 unsigned char *station_addr
= dev
->dev_addr
;
167 static unsigned version_printed
;
169 if (!request_region(ioaddr
, E21_IO_EXTENT
, DRV_NAME
))
172 /* First check the station address for the Ctron prefix. */
173 if (inb(ioaddr
+ E21_SAPROM
+ 0) != 0x00
174 || inb(ioaddr
+ E21_SAPROM
+ 1) != 0x00
175 || inb(ioaddr
+ E21_SAPROM
+ 2) != 0x1d) {
180 /* Verify by making certain that there is a 8390 at there. */
181 outb(E8390_NODMA
+ E8390_STOP
, ioaddr
);
182 udelay(1); /* we want to delay one I/O cycle - which is 2MHz */
183 status
= inb(ioaddr
);
184 if (status
!= 0x21 && status
!= 0x23) {
189 /* Read the station address PROM. */
190 for (i
= 0; i
< 6; i
++)
191 station_addr
[i
] = inb(ioaddr
+ E21_SAPROM
+ i
);
193 inb(ioaddr
+ E21_MEDIA
); /* Point to media selection. */
194 outb(0, ioaddr
+ E21_ASIC
); /* and disable the secondary interface. */
196 if (ei_debug
&& version_printed
++ == 0)
199 for (i
= 0; i
< 6; i
++)
200 printk(" %02X", station_addr
[i
]);
203 int irqlist
[] = {15,11,10,12,5,9,3,4}, i
;
204 for (i
= 0; i
< 8; i
++)
205 if (request_irq (irqlist
[i
], NULL
, 0, "bogus", NULL
) != -EBUSY
) {
206 dev
->irq
= irqlist
[i
];
210 printk(" unable to get IRQ %d.\n", dev
->irq
);
214 } else if (dev
->irq
== 2) /* Fixup luser bogosity: IRQ2 is really IRQ9 */
217 /* The 8390 is at the base address. */
218 dev
->base_addr
= ioaddr
;
220 ei_status
.name
= "E2100";
221 ei_status
.word16
= 1;
222 ei_status
.tx_start_page
= E21_TX_START_PG
;
223 ei_status
.rx_start_page
= E21_RX_START_PG
;
224 ei_status
.stop_page
= E21_RX_STOP_PG
;
225 ei_status
.saved_irq
= dev
->irq
;
227 /* Check the media port used. The port can be passed in on the
229 if (dev
->mem_end
& 15)
230 dev
->if_port
= dev
->mem_end
& 7;
233 inb(ioaddr
+ E21_MEDIA
); /* Turn automatic media detection on. */
234 for(i
= 0; i
< 6; i
++)
235 if (station_addr
[i
] != inb(ioaddr
+ E21_SAPROM
+ 8 + i
)) {
241 /* Never map in the E21 shared memory unless you are actively using it.
242 Also, the shared memory has effective only one setting -- spread all
243 over the 128K region! */
244 if (dev
->mem_start
== 0)
245 dev
->mem_start
= 0xd0000;
247 ei_status
.mem
= ioremap(dev
->mem_start
, 2*1024);
248 if (!ei_status
.mem
) {
249 printk("unable to remap memory\n");
255 /* These values are unused. The E2100 has a 2K window into the packet
256 buffer. The window can be set to start on any page boundary. */
257 ei_status
.rmem_start
= dev
->mem_start
+ TX_PAGES
*256;
258 dev
->mem_end
= ei_status
.rmem_end
= dev
->mem_start
+ 2*1024;
261 printk(", IRQ %d, %s media, memory @ %#lx.\n", dev
->irq
,
262 dev
->if_port
? "secondary" : "primary", dev
->mem_start
);
264 ei_status
.reset_8390
= &e21_reset_8390
;
265 ei_status
.block_input
= &e21_block_input
;
266 ei_status
.block_output
= &e21_block_output
;
267 ei_status
.get_8390_hdr
= &e21_get_8390_hdr
;
268 dev
->open
= &e21_open
;
269 dev
->stop
= &e21_close
;
270 #ifdef CONFIG_NET_POLL_CONTROLLER
271 dev
->poll_controller
= ei_poll
;
275 retval
= register_netdev(dev
);
280 release_region(ioaddr
, E21_IO_EXTENT
);
285 e21_open(struct net_device
*dev
)
287 short ioaddr
= dev
->base_addr
;
290 if ((retval
= request_irq(dev
->irq
, ei_interrupt
, 0, dev
->name
, dev
)))
293 /* Set the interrupt line and memory base on the hardware. */
294 inb(ioaddr
+ E21_IRQ_LOW
);
295 outb(0, ioaddr
+ E21_ASIC
+ (dev
->irq
& 7));
296 inb(ioaddr
+ E21_IRQ_HIGH
); /* High IRQ bit, and if_port. */
297 outb(0, ioaddr
+ E21_ASIC
+ (dev
->irq
> 7 ? 1:0)
298 + (dev
->if_port
? E21_ALT_IFPORT
: 0));
299 inb(ioaddr
+ E21_MEM_BASE
);
300 outb(0, ioaddr
+ E21_ASIC
+ ((dev
->mem_start
>> 17) & 7));
307 e21_reset_8390(struct net_device
*dev
)
309 short ioaddr
= dev
->base_addr
;
312 if (ei_debug
> 1) printk("resetting the E2180x3 t=%ld...", jiffies
);
315 /* Set up the ASIC registers, just in case something changed them. */
317 if (ei_debug
> 1) printk("reset done\n");
321 /* Grab the 8390 specific header. We put the 2k window so the header page
322 appears at the start of the shared memory. */
325 e21_get_8390_hdr(struct net_device
*dev
, struct e8390_pkt_hdr
*hdr
, int ring_page
)
328 short ioaddr
= dev
->base_addr
;
329 char __iomem
*shared_mem
= ei_status
.mem
;
331 mem_on(ioaddr
, shared_mem
, ring_page
);
334 /* Officially this is what we are doing, but the readl() is faster */
335 memcpy_fromio(hdr
, shared_mem
, sizeof(struct e8390_pkt_hdr
));
337 ((unsigned int*)hdr
)[0] = readl(shared_mem
);
340 /* Turn off memory access: we would need to reprogram the window anyway. */
345 /* Block input and output are easy on shared memory ethercards.
346 The E21xx makes block_input() especially easy by wrapping the top
347 ring buffer to the bottom automatically. */
349 e21_block_input(struct net_device
*dev
, int count
, struct sk_buff
*skb
, int ring_offset
)
351 short ioaddr
= dev
->base_addr
;
352 char __iomem
*shared_mem
= ei_status
.mem
;
354 mem_on(ioaddr
, shared_mem
, (ring_offset
>>8));
356 memcpy_fromio(skb
->data
, ei_status
.mem
+ (ring_offset
& 0xff), count
);
362 e21_block_output(struct net_device
*dev
, int count
, const unsigned char *buf
,
365 short ioaddr
= dev
->base_addr
;
366 volatile char __iomem
*shared_mem
= ei_status
.mem
;
368 /* Set the shared memory window start by doing a read, with the low address
369 bits specifying the starting page. */
370 readb(shared_mem
+ start_page
);
371 mem_on(ioaddr
, shared_mem
, start_page
);
373 memcpy_toio(shared_mem
, buf
, count
);
378 e21_close(struct net_device
*dev
)
380 short ioaddr
= dev
->base_addr
;
383 printk("%s: Shutting down ethercard.\n", dev
->name
);
385 free_irq(dev
->irq
, dev
);
386 dev
->irq
= ei_status
.saved_irq
;
388 /* Shut off the interrupt line and secondary interface. */
389 inb(ioaddr
+ E21_IRQ_LOW
);
390 outb(0, ioaddr
+ E21_ASIC
);
391 inb(ioaddr
+ E21_IRQ_HIGH
); /* High IRQ bit, and if_port. */
392 outb(0, ioaddr
+ E21_ASIC
);
396 /* Double-check that the memory has been turned off, because really
397 really bad things happen if it isn't. */
405 #define MAX_E21_CARDS 4 /* Max number of E21 cards per module */
406 static struct net_device
*dev_e21
[MAX_E21_CARDS
];
407 static int io
[MAX_E21_CARDS
];
408 static int irq
[MAX_E21_CARDS
];
409 static int mem
[MAX_E21_CARDS
];
410 static int xcvr
[MAX_E21_CARDS
]; /* choose int. or ext. xcvr */
412 module_param_array(io
, int, NULL
, 0);
413 module_param_array(irq
, int, NULL
, 0);
414 module_param_array(mem
, int, NULL
, 0);
415 module_param_array(xcvr
, int, NULL
, 0);
416 MODULE_PARM_DESC(io
, "I/O base address(es)");
417 MODULE_PARM_DESC(irq
, "IRQ number(s)");
418 MODULE_PARM_DESC(mem
, " memory base address(es)");
419 MODULE_PARM_DESC(xcvr
, "transceiver(s) (0=internal, 1=external)");
420 MODULE_DESCRIPTION("Cabletron E2100 ISA ethernet driver");
421 MODULE_LICENSE("GPL");
423 /* This is set up so that only a single autoprobe takes place per call.
424 ISA device autoprobes on a running machine are not recommended. */
426 int __init
init_module(void)
428 struct net_device
*dev
;
429 int this_dev
, found
= 0;
431 for (this_dev
= 0; this_dev
< MAX_E21_CARDS
; this_dev
++) {
432 if (io
[this_dev
] == 0) {
433 if (this_dev
!= 0) break; /* only autoprobe 1st one */
434 printk(KERN_NOTICE
"e2100.c: Presently autoprobing (not recommended) for a single card.\n");
436 dev
= alloc_ei_netdev();
439 dev
->irq
= irq
[this_dev
];
440 dev
->base_addr
= io
[this_dev
];
441 dev
->mem_start
= mem
[this_dev
];
442 dev
->mem_end
= xcvr
[this_dev
]; /* low 4bits = xcvr sel. */
443 if (do_e2100_probe(dev
) == 0) {
444 dev_e21
[found
++] = dev
;
448 printk(KERN_WARNING
"e2100.c: No E2100 card found (i/o = 0x%x).\n", io
[this_dev
]);
456 static void cleanup_card(struct net_device
*dev
)
458 /* NB: e21_close() handles free_irq */
459 iounmap(ei_status
.mem
);
460 release_region(dev
->base_addr
, E21_IO_EXTENT
);
468 for (this_dev
= 0; this_dev
< MAX_E21_CARDS
; this_dev
++) {
469 struct net_device
*dev
= dev_e21
[this_dev
];
471 unregister_netdev(dev
);
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