1/*
2 * Linux ARCnet driver - COM20020 chipset support
3 *
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.
8 *
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 *  for sponsoring the further development of this driver.
11 *
12 * **********************
13 *
14 * The original copyright of skeleton.c was as follows:
15 *
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.
21 *
22 * **********************
23 *
24 * For more details, see drivers/net/arcnet.c
25 *
26 * **********************
27 */
28#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/kernel.h>
31#include <linux/types.h>
32#include <linux/ioport.h>
33#include <linux/slab.h>
34#include <linux/errno.h>
35#include <linux/delay.h>
36#include <linux/netdevice.h>
37#include <linux/init.h>
38#include <linux/bootmem.h>
39#include <linux/arcdevice.h>
40#include <linux/com20020.h>
41
42#include <asm/io.h>
43
44#define VERSION "arcnet: COM20020 ISA support (by David Woodhouse et al.)\n"
45
46
47/*
48 * We cannot (yet) probe for an IO mapped card, although we can check that
49 * it's where we were told it was, and even do autoirq.
50 */
51static int __init com20020isa_probe(struct net_device *dev)
52{
53	int ioaddr;
54	unsigned long airqmask;
55	struct arcnet_local *lp = dev->priv;
56	int err;
57
58	BUGLVL(D_NORMAL) printk(VERSION);
59
60	ioaddr = dev->base_addr;
61	if (!ioaddr) {
62		BUGMSG(D_NORMAL, "No autoprobe (yet) for IO mapped cards; you "
63		       "must specify the base address!\n");
64		return -ENODEV;
65	}
66	if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (COM20020)")) {
67		BUGMSG(D_NORMAL, "IO region %xh-%xh already allocated.\n",
68		       ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
69		return -ENXIO;
70	}
71	if (ASTATUS() == 0xFF) {
72		BUGMSG(D_NORMAL, "IO address %x empty\n", ioaddr);
73		err = -ENODEV;
74		goto out;
75	}
76	if (com20020_check(dev)) {
77		err = -ENODEV;
78		goto out;
79	}
80
81	if (!dev->irq) {
82		/* if we do this, we're sure to get an IRQ since the
83		 * card has just reset and the NORXflag is on until
84		 * we tell it to start receiving.
85		 */
86		BUGMSG(D_INIT_REASONS, "intmask was %02Xh\n", inb(_INTMASK));
87		outb(0, _INTMASK);
88		airqmask = probe_irq_on();
89		outb(NORXflag, _INTMASK);
90		udelay(1);
91		outb(0, _INTMASK);
92		dev->irq = probe_irq_off(airqmask);
93
94		if (dev->irq <= 0) {
95			BUGMSG(D_INIT_REASONS, "Autoprobe IRQ failed first time\n");
96			airqmask = probe_irq_on();
97			outb(NORXflag, _INTMASK);
98			udelay(5);
99			outb(0, _INTMASK);
100			dev->irq = probe_irq_off(airqmask);
101			if (dev->irq <= 0) {
102				BUGMSG(D_NORMAL, "Autoprobe IRQ failed.\n");
103				err = -ENODEV;
104				goto out;
105			}
106		}
107	}
108
109	lp->card_name = "ISA COM20020";
110	if ((err = com20020_found(dev, 0)) != 0)
111		goto out;
112
113	return 0;
114
115out:
116	release_region(ioaddr, ARCNET_TOTAL_SIZE);
117	return err;
118}
119
120static int node = 0;
121static int io = 0x0;		/* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
122static int irq = 0;		/* or use the insmod io= irq= shmem= options */
123static char device[9];		/* use eg. device="arc1" to change name */
124static int timeout = 3;
125static int backplane = 0;
126static int clockp = 0;
127static int clockm = 0;
128
129module_param(node, int, 0);
130module_param(io, int, 0);
131module_param(irq, int, 0);
132module_param_string(device, device, sizeof(device), 0);
133module_param(timeout, int, 0);
134module_param(backplane, int, 0);
135module_param(clockp, int, 0);
136module_param(clockm, int, 0);
137
138MODULE_LICENSE("GPL");
139
140static struct net_device *my_dev;
141
142static int __init com20020_init(void)
143{
144	struct net_device *dev;
145	struct arcnet_local *lp;
146
147	dev = alloc_arcdev(device);
148	if (!dev)
149		return -ENOMEM;
150
151	if (node && node != 0xff)
152		dev->dev_addr[0] = node;
153
154	lp = dev->priv;
155	lp->backplane = backplane;
156	lp->clockp = clockp & 7;
157	lp->clockm = clockm & 3;
158	lp->timeout = timeout & 3;
159	lp->hw.owner = THIS_MODULE;
160
161	dev->base_addr = io;
162	dev->irq = irq;
163
164	if (dev->irq == 2)
165		dev->irq = 9;
166
167	if (com20020isa_probe(dev)) {
168		free_netdev(dev);
169		return -EIO;
170	}
171
172	my_dev = dev;
173	return 0;
174}
175
176static void __exit com20020_exit(void)
177{
178	unregister_netdev(my_dev);
179	free_irq(my_dev->irq, my_dev);
180	release_region(my_dev->base_addr, ARCNET_TOTAL_SIZE);
181	free_netdev(my_dev);
182}
183
184#ifndef MODULE
185static int __init com20020isa_setup(char *s)
186{
187	int ints[8];
188
189	s = get_options(s, 8, ints);
190	if (!ints[0])
191		return 1;
192
193	switch (ints[0]) {
194	default:		/* ERROR */
195		printk("com90xx: Too many arguments.\n");
196	case 6:		/* Timeout */
197		timeout = ints[6];
198	case 5:		/* CKP value */
199		clockp = ints[5];
200	case 4:		/* Backplane flag */
201		backplane = ints[4];
202	case 3:		/* Node ID */
203		node = ints[3];
204	case 2:		/* IRQ */
205		irq = ints[2];
206	case 1:		/* IO address */
207		io = ints[1];
208	}
209	if (*s)
210		snprintf(device, sizeof(device), "%s", s);
211	return 1;
212}
213
214__setup("com20020=", com20020isa_setup);
215
216#endif				/* MODULE */
217
218module_init(com20020_init)
219module_exit(com20020_exit)
220