2 * Linux ARCnet driver - COM90xx chipset (IO-mapped buffers)
4 * Written 1997 by David Woodhouse.
5 * Written 1994-1999 by Avery Pennarun.
6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
7 * Derived from skeleton.c by Donald Becker.
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
12 * **********************
14 * The original copyright of skeleton.c was as follows:
16 * skeleton.c Written 1993 by Donald Becker.
17 * Copyright 1993 United States Government as represented by the
18 * Director, National Security Agency. This software may only be used
19 * and distributed according to the terms of the GNU General Public License as
20 * modified by SRC, incorporated herein by reference.
22 * **********************
24 * For more details, see drivers/net/arcnet.c
26 * **********************
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <linux/ioport.h>
32 #include <linux/delay.h>
33 #include <linux/netdevice.h>
34 #include <linux/bootmem.h>
35 #include <linux/init.h>
37 #include <linux/arcdevice.h>
40 #define VERSION "arcnet: COM90xx IO-mapped mode support (by David Woodhouse et el.)\n"
43 /* Internal function declarations */
45 static int com90io_found(struct net_device
*dev
);
46 static void com90io_command(struct net_device
*dev
, int command
);
47 static int com90io_status(struct net_device
*dev
);
48 static void com90io_setmask(struct net_device
*dev
, int mask
);
49 static int com90io_reset(struct net_device
*dev
, int really_reset
);
50 static void com90io_copy_to_card(struct net_device
*dev
, int bufnum
, int offset
,
51 void *buf
, int count
);
52 static void com90io_copy_from_card(struct net_device
*dev
, int bufnum
, int offset
,
53 void *buf
, int count
);
56 /* Handy defines for ARCnet specific stuff */
58 /* The number of low I/O ports used by the card. */
59 #define ARCNET_TOTAL_SIZE 16
61 /* COM 9026 controller chip --> ARCnet register addresses */
62 #define _INTMASK (ioaddr+0) /* writable */
63 #define _STATUS (ioaddr+0) /* readable */
64 #define _COMMAND (ioaddr+1) /* writable, returns random vals on read (?) */
65 #define _RESET (ioaddr+8) /* software reset (on read) */
66 #define _MEMDATA (ioaddr+12) /* Data port for IO-mapped memory */
67 #define _ADDR_HI (ioaddr+15) /* Control registers for said */
68 #define _ADDR_LO (ioaddr+14)
69 #define _CONFIG (ioaddr+2) /* Configuration register */
75 #define ASTATUS() inb(_STATUS)
76 #define ACOMMAND(cmd) outb((cmd),_COMMAND)
77 #define AINTMASK(msk) outb((msk),_INTMASK)
78 #define SETCONF() outb((lp->config),_CONFIG)
81 /****************************************************************************
83 * IO-mapped operation routines *
85 ****************************************************************************/
87 #undef ONE_AT_A_TIME_TX
88 #undef ONE_AT_A_TIME_RX
90 static u_char
get_buffer_byte(struct net_device
*dev
, unsigned offset
)
92 int ioaddr
= dev
->base_addr
;
94 outb(offset
>> 8, _ADDR_HI
);
95 outb(offset
& 0xff, _ADDR_LO
);
100 #ifdef ONE_AT_A_TIME_TX
101 static void put_buffer_byte(struct net_device
*dev
, unsigned offset
, u_char datum
)
103 int ioaddr
= dev
->base_addr
;
105 outb(offset
>> 8, _ADDR_HI
);
106 outb(offset
& 0xff, _ADDR_LO
);
108 outb(datum
, _MEMDATA
);
114 static void get_whole_buffer(struct net_device
*dev
, unsigned offset
, unsigned length
, char *dest
)
116 int ioaddr
= dev
->base_addr
;
118 outb((offset
>> 8) | AUTOINCflag
, _ADDR_HI
);
119 outb(offset
& 0xff, _ADDR_LO
);
122 #ifdef ONE_AT_A_TIME_RX
123 *(dest
++) = get_buffer_byte(dev
, offset
++);
125 *(dest
++) = inb(_MEMDATA
);
129 static void put_whole_buffer(struct net_device
*dev
, unsigned offset
, unsigned length
, char *dest
)
131 int ioaddr
= dev
->base_addr
;
133 outb((offset
>> 8) | AUTOINCflag
, _ADDR_HI
);
134 outb(offset
& 0xff, _ADDR_LO
);
137 #ifdef ONE_AT_A_TIME_TX
138 put_buffer_byte(dev
, offset
++, *(dest
++));
140 outb(*(dest
++), _MEMDATA
);
145 * We cannot probe for an IO mapped card either, although we can check that
146 * it's where we were told it was, and even autoirq
148 static int __init
com90io_probe(struct net_device
*dev
)
150 int ioaddr
= dev
->base_addr
, status
;
151 unsigned long airqmask
;
153 BUGLVL(D_NORMAL
) printk(VERSION
);
154 BUGLVL(D_NORMAL
) printk("E-mail me if you actually test this driver, please!\n");
157 BUGMSG(D_NORMAL
, "No autoprobe for IO mapped cards; you "
158 "must specify the base address!\n");
161 if (!request_region(ioaddr
, ARCNET_TOTAL_SIZE
, "com90io probe")) {
162 BUGMSG(D_INIT_REASONS
, "IO request_region %x-%x failed.\n",
163 ioaddr
, ioaddr
+ ARCNET_TOTAL_SIZE
- 1);
166 if (ASTATUS() == 0xFF) {
167 BUGMSG(D_INIT_REASONS
, "IO address %x empty\n", ioaddr
);
175 if ((status
& 0x9D) != (NORXflag
| RECONflag
| TXFREEflag
| RESETflag
)) {
176 BUGMSG(D_INIT_REASONS
, "Status invalid (%Xh).\n", status
);
179 BUGMSG(D_INIT_REASONS
, "Status after reset: %X\n", status
);
181 ACOMMAND(CFLAGScmd
| RESETclear
| CONFIGclear
);
183 BUGMSG(D_INIT_REASONS
, "Status after reset acknowledged: %X\n", status
);
187 if (status
& RESETflag
) {
188 BUGMSG(D_INIT_REASONS
, "Eternal reset (status=%Xh)\n", status
);
191 outb((0x16 | IOMAPflag
) & ~ENABLE16flag
, _CONFIG
);
193 /* Read first loc'n of memory */
195 outb(AUTOINCflag
, _ADDR_HI
);
198 if ((status
= inb(_MEMDATA
)) != 0xd1) {
199 BUGMSG(D_INIT_REASONS
, "Signature byte not found"
200 " (%Xh instead).\n", status
);
205 * if we do this, we're sure to get an IRQ since the
206 * card has just reset and the NORXflag is on until
207 * we tell it to start receiving.
210 airqmask
= probe_irq_on();
211 outb(NORXflag
, _INTMASK
);
214 dev
->irq
= probe_irq_off(airqmask
);
217 BUGMSG(D_INIT_REASONS
, "Autoprobe IRQ failed\n");
221 release_region(ioaddr
, ARCNET_TOTAL_SIZE
); /* end of probing */
222 return com90io_found(dev
);
225 release_region(ioaddr
, ARCNET_TOTAL_SIZE
);
230 /* Set up the struct net_device associated with this card. Called after
233 static int __init
com90io_found(struct net_device
*dev
)
235 struct arcnet_local
*lp
;
236 int ioaddr
= dev
->base_addr
;
239 /* Reserve the irq */
240 if (request_irq(dev
->irq
, arcnet_interrupt
, 0, "arcnet (COM90xx-IO)", dev
)) {
241 BUGMSG(D_NORMAL
, "Can't get IRQ %d!\n", dev
->irq
);
244 /* Reserve the I/O region */
245 if (!request_region(dev
->base_addr
, ARCNET_TOTAL_SIZE
, "arcnet (COM90xx-IO)")) {
246 free_irq(dev
->irq
, dev
);
250 lp
= netdev_priv(dev
);
251 lp
->card_name
= "COM90xx I/O";
252 lp
->hw
.command
= com90io_command
;
253 lp
->hw
.status
= com90io_status
;
254 lp
->hw
.intmask
= com90io_setmask
;
255 lp
->hw
.reset
= com90io_reset
;
256 lp
->hw
.owner
= THIS_MODULE
;
257 lp
->hw
.copy_to_card
= com90io_copy_to_card
;
258 lp
->hw
.copy_from_card
= com90io_copy_from_card
;
260 lp
->config
= (0x16 | IOMAPflag
) & ~ENABLE16flag
;
263 /* get and check the station ID from offset 1 in shmem */
265 dev
->dev_addr
[0] = get_buffer_byte(dev
, 1);
267 err
= register_netdev(dev
);
269 outb((inb(_CONFIG
) & ~IOMAPflag
), _CONFIG
);
270 free_irq(dev
->irq
, dev
);
271 release_region(dev
->base_addr
, ARCNET_TOTAL_SIZE
);
275 BUGMSG(D_NORMAL
, "COM90IO: station %02Xh found at %03lXh, IRQ %d.\n",
276 dev
->dev_addr
[0], dev
->base_addr
, dev
->irq
);
283 * Do a hardware reset on the card, and set up necessary registers.
285 * This should be called as little as possible, because it disrupts the
286 * token on the network (causes a RECON) and requires a significant delay.
288 * However, it does make sure the card is in a defined state.
290 static int com90io_reset(struct net_device
*dev
, int really_reset
)
292 struct arcnet_local
*lp
= netdev_priv(dev
);
293 short ioaddr
= dev
->base_addr
;
295 BUGMSG(D_INIT
, "Resetting %s (status=%02Xh)\n", dev
->name
, ASTATUS());
302 /* Set the thing to IO-mapped, 8-bit mode */
303 lp
->config
= (0x1C | IOMAPflag
) & ~ENABLE16flag
;
306 ACOMMAND(CFLAGScmd
| RESETclear
); /* clear flags & end reset */
307 ACOMMAND(CFLAGScmd
| CONFIGclear
);
309 /* verify that the ARCnet signature byte is present */
310 if (get_buffer_byte(dev
, 0) != TESTvalue
) {
311 BUGMSG(D_NORMAL
, "reset failed: TESTvalue not present.\n");
314 /* enable extended (512-byte) packets */
315 ACOMMAND(CONFIGcmd
| EXTconf
);
317 /* done! return success. */
322 static void com90io_command(struct net_device
*dev
, int cmd
)
324 short ioaddr
= dev
->base_addr
;
330 static int com90io_status(struct net_device
*dev
)
332 short ioaddr
= dev
->base_addr
;
338 static void com90io_setmask(struct net_device
*dev
, int mask
)
340 short ioaddr
= dev
->base_addr
;
345 static void com90io_copy_to_card(struct net_device
*dev
, int bufnum
, int offset
,
346 void *buf
, int count
)
348 TIME("put_whole_buffer", count
, put_whole_buffer(dev
, bufnum
* 512 + offset
, count
, buf
));
352 static void com90io_copy_from_card(struct net_device
*dev
, int bufnum
, int offset
,
353 void *buf
, int count
)
355 TIME("get_whole_buffer", count
, get_whole_buffer(dev
, bufnum
* 512 + offset
, count
, buf
));
358 static int io
; /* use the insmod io= irq= shmem= options */
360 static char device
[9]; /* use eg. device=arc1 to change name */
362 module_param(io
, int, 0);
363 module_param(irq
, int, 0);
364 module_param_string(device
, device
, sizeof(device
), 0);
365 MODULE_LICENSE("GPL");
368 static int __init
com90io_setup(char *s
)
371 s
= get_options(s
, 4, ints
);
376 printk("com90io: Too many arguments.\n");
379 case 1: /* IO address */
383 snprintf(device
, sizeof(device
), "%s", s
);
386 __setup("com90io=", com90io_setup
);
389 static struct net_device
*my_dev
;
391 static int __init
com90io_init(void)
393 struct net_device
*dev
;
396 dev
= alloc_arcdev(device
);
405 err
= com90io_probe(dev
);
416 static void __exit
com90io_exit(void)
418 struct net_device
*dev
= my_dev
;
419 int ioaddr
= dev
->base_addr
;
421 unregister_netdev(dev
);
423 /* Set the thing back to MMAP mode, in case the old driver is loaded later */
424 outb((inb(_CONFIG
) & ~IOMAPflag
), _CONFIG
);
426 free_irq(dev
->irq
, dev
);
427 release_region(dev
->base_addr
, ARCNET_TOTAL_SIZE
);
431 module_init(com90io_init
)
432 module_exit(com90io_exit
)
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