1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
/*
* Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public License
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/isa.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/platform/sja1000.h>
#include "sja1000.h"
#define DRV_NAME "sja1000_isa"
#define MAXDEV 8
MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
MODULE_LICENSE("GPL v2");
#define CLK_DEFAULT 16000000 /* 16 MHz */
#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
#define OCR_DEFAULT OCR_TX0_PUSHPULL
static unsigned long port[MAXDEV];
static unsigned long mem[MAXDEV];
static int __devinitdata irq[MAXDEV];
static int __devinitdata clk[MAXDEV];
static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
module_param_array(port, ulong, NULL, S_IRUGO);
MODULE_PARM_DESC(port, "I/O port number");
module_param_array(mem, ulong, NULL, S_IRUGO);
MODULE_PARM_DESC(mem, "I/O memory address");
module_param_array(indirect, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
module_param_array(irq, int, NULL, S_IRUGO);
MODULE_PARM_DESC(irq, "IRQ number");
module_param_array(clk, int, NULL, S_IRUGO);
MODULE_PARM_DESC(clk, "External oscillator clock frequency "
"(default=16000000 [16 MHz])");
module_param_array(cdr, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(cdr, "Clock divider register "
"(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
module_param_array(ocr, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(ocr, "Output control register "
"(default=0x18 [OCR_TX0_PUSHPULL])");
#define SJA1000_IOSIZE 0x20
#define SJA1000_IOSIZE_INDIRECT 0x02
static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
{
return readb(priv->reg_base + reg);
}
static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
int reg, u8 val)
{
writeb(val, priv->reg_base + reg);
}
static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
{
return inb((unsigned long)priv->reg_base + reg);
}
static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
int reg, u8 val)
{
outb(val, (unsigned long)priv->reg_base + reg);
}
static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
int reg)
{
unsigned long base = (unsigned long)priv->reg_base;
outb(reg, base);
return inb(base + 1);
}
static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
int reg, u8 val)
{
unsigned long base = (unsigned long)priv->reg_base;
outb(reg, base);
outb(val, base + 1);
}
static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx)
{
if (port[idx] || mem[idx]) {
if (irq[idx])
return 1;
} else if (idx)
return 0;
dev_err(pdev, "insufficient parameters supplied\n");
return 0;
}
static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
{
struct net_device *dev;
struct sja1000_priv *priv;
void __iomem *base = NULL;
int iosize = SJA1000_IOSIZE;
int err;
if (mem[idx]) {
if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
err = -EBUSY;
goto exit;
}
base = ioremap_nocache(mem[idx], iosize);
if (!base) {
err = -ENOMEM;
goto exit_release;
}
} else {
if (indirect[idx] > 0 ||
(indirect[idx] == -1 && indirect[0] > 0))
iosize = SJA1000_IOSIZE_INDIRECT;
if (!request_region(port[idx], iosize, DRV_NAME)) {
err = -EBUSY;
goto exit;
}
}
dev = alloc_sja1000dev(0);
if (!dev) {
err = -ENOMEM;
goto exit_unmap;
}
priv = netdev_priv(dev);
dev->irq = irq[idx];
priv->irq_flags = IRQF_SHARED;
if (mem[idx]) {
priv->reg_base = base;
dev->base_addr = mem[idx];
priv->read_reg = sja1000_isa_mem_read_reg;
priv->write_reg = sja1000_isa_mem_write_reg;
} else {
priv->reg_base = (void __iomem *)port[idx];
dev->base_addr = port[idx];
if (iosize == SJA1000_IOSIZE_INDIRECT) {
priv->read_reg = sja1000_isa_port_read_reg_indirect;
priv->write_reg = sja1000_isa_port_write_reg_indirect;
} else {
priv->read_reg = sja1000_isa_port_read_reg;
priv->write_reg = sja1000_isa_port_write_reg;
}
}
if (clk[idx])
priv->can.clock.freq = clk[idx] / 2;
else if (clk[0])
priv->can.clock.freq = clk[0] / 2;
else
priv->can.clock.freq = CLK_DEFAULT / 2;
if (ocr[idx] != -1)
priv->ocr = ocr[idx] & 0xff;
else if (ocr[0] != -1)
priv->ocr = ocr[0] & 0xff;
else
priv->ocr = OCR_DEFAULT;
if (cdr[idx] != -1)
priv->cdr = cdr[idx] & 0xff;
else if (cdr[0] != -1)
priv->cdr = cdr[0] & 0xff;
else
priv->cdr = CDR_DEFAULT;
dev_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, pdev);
err = register_sja1000dev(dev);
if (err) {
dev_err(pdev, "registering %s failed (err=%d)\n",
DRV_NAME, err);
goto exit_unmap;
}
dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n",
DRV_NAME, priv->reg_base, dev->irq);
return 0;
exit_unmap:
if (mem[idx])
iounmap(base);
exit_release:
if (mem[idx])
release_mem_region(mem[idx], iosize);
else
release_region(port[idx], iosize);
exit:
return err;
}
static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx)
{
struct net_device *dev = dev_get_drvdata(pdev);
struct sja1000_priv *priv = netdev_priv(dev);
unregister_sja1000dev(dev);
dev_set_drvdata(pdev, NULL);
if (mem[idx]) {
iounmap(priv->reg_base);
release_mem_region(mem[idx], SJA1000_IOSIZE);
} else {
if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
else
release_region(port[idx], SJA1000_IOSIZE);
}
free_sja1000dev(dev);
return 0;
}
static struct isa_driver sja1000_isa_driver = {
.match = sja1000_isa_match,
.probe = sja1000_isa_probe,
.remove = __devexit_p(sja1000_isa_remove),
.driver = {
.name = DRV_NAME,
},
};
static int __init sja1000_isa_init(void)
{
int err = isa_register_driver(&sja1000_isa_driver, MAXDEV);
if (!err)
printk(KERN_INFO
"Legacy %s driver for max. %d devices registered\n",
DRV_NAME, MAXDEV);
return err;
}
static void __exit sja1000_isa_exit(void)
{
isa_unregister_driver(&sja1000_isa_driver);
}
module_init(sja1000_isa_init);
module_exit(sja1000_isa_exit);
|
