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  */
51 static 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 
115 out:
116 	release_region(ioaddr, ARCNET_TOTAL_SIZE);
117 	return err;
118 }
119 
120 static int node = 0;
121 static int io = 0x0;		/* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
122 static int irq = 0;		/* or use the insmod io= irq= shmem= options */
123 static char device[9];		/* use eg. device="arc1" to change name */
124 static int timeout = 3;
125 static int backplane = 0;
126 static int clockp = 0;
127 static int clockm = 0;
128 
129 module_param(node, int, 0);
130 module_param(io, int, 0);
131 module_param(irq, int, 0);
132 module_param_string(device, device, sizeof(device), 0);
133 module_param(timeout, int, 0);
134 module_param(backplane, int, 0);
135 module_param(clockp, int, 0);
136 module_param(clockm, int, 0);
137 
138 MODULE_LICENSE("GPL");
139 
140 static struct net_device *my_dev;
141 
142 static 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 
176 static 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
185 static 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 
218 module_init(com20020_init)
219 module_exit(com20020_exit)
220