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 
29 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt
30 
31 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33 #include <linux/kernel.h>
34 #include <linux/types.h>
35 #include <linux/ioport.h>
36 #include <linux/errno.h>
37 #include <linux/delay.h>
38 #include <linux/netdevice.h>
39 #include <linux/init.h>
40 #include <linux/interrupt.h>
41 #include <linux/bootmem.h>
42 #include <linux/io.h>
43 
44 #include "arcdevice.h"
45 #include "com20020.h"
46 
47 /* We cannot (yet) probe for an IO mapped card, although we can check that
48  * it's where we were told it was, and even do autoirq.
49  */
50 static int __init com20020isa_probe(struct net_device *dev)
51 {
52 	int ioaddr;
53 	unsigned long airqmask;
54 	struct arcnet_local *lp = netdev_priv(dev);
55 	int err;
56 
57 	if (BUGLVL(D_NORMAL))
58 		pr_info("%s\n", "COM20020 ISA support (by David Woodhouse et al.)");
59 
60 	ioaddr = dev->base_addr;
61 	if (!ioaddr) {
62 		arc_printk(D_NORMAL, dev, "No autoprobe (yet) for IO mapped cards; you must specify the base address!\n");
63 		return -ENODEV;
64 	}
65 	if (!request_region(ioaddr, ARCNET_TOTAL_SIZE, "arcnet (COM20020)")) {
66 		arc_printk(D_NORMAL, dev, "IO region %xh-%xh already allocated.\n",
67 			   ioaddr, ioaddr + ARCNET_TOTAL_SIZE - 1);
68 		return -ENXIO;
69 	}
70 	if (arcnet_inb(ioaddr, COM20020_REG_R_STATUS) == 0xFF) {
71 		arc_printk(D_NORMAL, dev, "IO address %x empty\n", ioaddr);
72 		err = -ENODEV;
73 		goto out;
74 	}
75 	if (com20020_check(dev)) {
76 		err = -ENODEV;
77 		goto out;
78 	}
79 
80 	if (!dev->irq) {
81 		/* if we do this, we're sure to get an IRQ since the
82 		 * card has just reset and the NORXflag is on until
83 		 * we tell it to start receiving.
84 		 */
85 		arc_printk(D_INIT_REASONS, dev, "intmask was %02Xh\n",
86 			   arcnet_inb(ioaddr, COM20020_REG_R_STATUS));
87 		arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
88 		airqmask = probe_irq_on();
89 		arcnet_outb(NORXflag, ioaddr, COM20020_REG_W_INTMASK);
90 		udelay(1);
91 		arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
92 		dev->irq = probe_irq_off(airqmask);
93 
94 		if ((int)dev->irq <= 0) {
95 			arc_printk(D_INIT_REASONS, dev, "Autoprobe IRQ failed first time\n");
96 			airqmask = probe_irq_on();
97 			arcnet_outb(NORXflag, ioaddr, COM20020_REG_W_INTMASK);
98 			udelay(5);
99 			arcnet_outb(0, ioaddr, COM20020_REG_W_INTMASK);
100 			dev->irq = probe_irq_off(airqmask);
101 			if ((int)dev->irq <= 0) {
102 				arc_printk(D_NORMAL, dev, "Autoprobe IRQ failed.\n");
103 				err = -ENODEV;
104 				goto out;
105 			}
106 		}
107 	}
108 
109 	lp->card_name = "ISA COM20020";
110 
111 	err = com20020_found(dev, 0);
112 	if (err != 0)
113 		goto out;
114 
115 	return 0;
116 
117 out:
118 	release_region(ioaddr, ARCNET_TOTAL_SIZE);
119 	return err;
120 }
121 
122 static int node = 0;
123 static int io = 0x0;		/* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
124 static int irq = 0;		/* or use the insmod io= irq= shmem= options */
125 static char device[9];		/* use eg. device="arc1" to change name */
126 static int timeout = 3;
127 static int backplane = 0;
128 static int clockp = 0;
129 static int clockm = 0;
130 
131 module_param(node, int, 0);
132 module_param(io, int, 0);
133 module_param(irq, int, 0);
134 module_param_string(device, device, sizeof(device), 0);
135 module_param(timeout, int, 0);
136 module_param(backplane, int, 0);
137 module_param(clockp, int, 0);
138 module_param(clockm, int, 0);
139 
140 MODULE_LICENSE("GPL");
141 
142 static struct net_device *my_dev;
143 
144 static int __init com20020_init(void)
145 {
146 	struct net_device *dev;
147 	struct arcnet_local *lp;
148 
149 	dev = alloc_arcdev(device);
150 	if (!dev)
151 		return -ENOMEM;
152 
153 	if (node && node != 0xff)
154 		dev->dev_addr[0] = node;
155 
156 	dev->netdev_ops = &com20020_netdev_ops;
157 
158 	lp = netdev_priv(dev);
159 	lp->backplane = backplane;
160 	lp->clockp = clockp & 7;
161 	lp->clockm = clockm & 3;
162 	lp->timeout = timeout & 3;
163 	lp->hw.owner = THIS_MODULE;
164 
165 	dev->base_addr = io;
166 	dev->irq = irq;
167 
168 	if (dev->irq == 2)
169 		dev->irq = 9;
170 
171 	if (com20020isa_probe(dev)) {
172 		free_netdev(dev);
173 		return -EIO;
174 	}
175 
176 	my_dev = dev;
177 	return 0;
178 }
179 
180 static void __exit com20020_exit(void)
181 {
182 	unregister_netdev(my_dev);
183 	free_irq(my_dev->irq, my_dev);
184 	release_region(my_dev->base_addr, ARCNET_TOTAL_SIZE);
185 	free_netdev(my_dev);
186 }
187 
188 #ifndef MODULE
189 static int __init com20020isa_setup(char *s)
190 {
191 	int ints[8];
192 
193 	s = get_options(s, 8, ints);
194 	if (!ints[0])
195 		return 1;
196 
197 	switch (ints[0]) {
198 	default:		/* ERROR */
199 		pr_info("Too many arguments\n");
200 	case 6:		/* Timeout */
201 		timeout = ints[6];
202 	case 5:		/* CKP value */
203 		clockp = ints[5];
204 	case 4:		/* Backplane flag */
205 		backplane = ints[4];
206 	case 3:		/* Node ID */
207 		node = ints[3];
208 	case 2:		/* IRQ */
209 		irq = ints[2];
210 	case 1:		/* IO address */
211 		io = ints[1];
212 	}
213 	if (*s)
214 		snprintf(device, sizeof(device), "%s", s);
215 	return 1;
216 }
217 
218 __setup("com20020=", com20020isa_setup);
219 
220 #endif				/* MODULE */
221 
222 module_init(com20020_init)
223 module_exit(com20020_exit)
224