Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / drivers / net / can / sja1000 / sja1000_isa.c
1 /*
2  * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the version 2 of the GNU General Public License
6  * as published by the Free Software Foundation
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software
15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/isa.h>
21 #include <linux/interrupt.h>
22 #include <linux/netdevice.h>
23 #include <linux/delay.h>
24 #include <linux/irq.h>
25 #include <linux/io.h>
26 #include <linux/can.h>
27 #include <linux/can/dev.h>
28 #include <linux/can/platform/sja1000.h>
29
30 #include "sja1000.h"
31
32 #define DRV_NAME "sja1000_isa"
33
34 #define MAXDEV 8
35
36 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
37 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
38 MODULE_LICENSE("GPL v2");
39
40 #define CLK_DEFAULT     16000000        /* 16 MHz */
41 #define CDR_DEFAULT     (CDR_CBP | CDR_CLK_OFF)
42 #define OCR_DEFAULT     OCR_TX0_PUSHPULL
43
44 static unsigned long port[MAXDEV];
45 static unsigned long mem[MAXDEV];
46 static int __devinitdata irq[MAXDEV];
47 static int __devinitdata clk[MAXDEV];
48 static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
49 static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
50 static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
51
52 module_param_array(port, ulong, NULL, S_IRUGO);
53 MODULE_PARM_DESC(port, "I/O port number");
54
55 module_param_array(mem, ulong, NULL, S_IRUGO);
56 MODULE_PARM_DESC(mem, "I/O memory address");
57
58 module_param_array(indirect, byte, NULL, S_IRUGO);
59 MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
60
61 module_param_array(irq, int, NULL, S_IRUGO);
62 MODULE_PARM_DESC(irq, "IRQ number");
63
64 module_param_array(clk, int, NULL, S_IRUGO);
65 MODULE_PARM_DESC(clk, "External oscillator clock frequency "
66                  "(default=16000000 [16 MHz])");
67
68 module_param_array(cdr, byte, NULL, S_IRUGO);
69 MODULE_PARM_DESC(cdr, "Clock divider register "
70                  "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
71
72 module_param_array(ocr, byte, NULL, S_IRUGO);
73 MODULE_PARM_DESC(ocr, "Output control register "
74                  "(default=0x18 [OCR_TX0_PUSHPULL])");
75
76 #define SJA1000_IOSIZE          0x20
77 #define SJA1000_IOSIZE_INDIRECT 0x02
78
79 static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
80 {
81         return readb(priv->reg_base + reg);
82 }
83
84 static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
85                                       int reg, u8 val)
86 {
87         writeb(val, priv->reg_base + reg);
88 }
89
90 static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
91 {
92         return inb((unsigned long)priv->reg_base + reg);
93 }
94
95 static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
96                                        int reg, u8 val)
97 {
98         outb(val, (unsigned long)priv->reg_base + reg);
99 }
100
101 static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
102                                              int reg)
103 {
104         unsigned long base = (unsigned long)priv->reg_base;
105
106         outb(reg, base);
107         return inb(base + 1);
108 }
109
110 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
111                                                 int reg, u8 val)
112 {
113         unsigned long base = (unsigned long)priv->reg_base;
114
115         outb(reg, base);
116         outb(val, base + 1);
117 }
118
119 static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx)
120 {
121         if (port[idx] || mem[idx]) {
122                 if (irq[idx])
123                         return 1;
124         } else if (idx)
125                 return 0;
126
127         dev_err(pdev, "insufficient parameters supplied\n");
128         return 0;
129 }
130
131 static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
132 {
133         struct net_device *dev;
134         struct sja1000_priv *priv;
135         void __iomem *base = NULL;
136         int iosize = SJA1000_IOSIZE;
137         int err;
138
139         if (mem[idx]) {
140                 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
141                         err = -EBUSY;
142                         goto exit;
143                 }
144                 base = ioremap_nocache(mem[idx], iosize);
145                 if (!base) {
146                         err = -ENOMEM;
147                         goto exit_release;
148                 }
149         } else {
150                 if (indirect[idx] > 0 ||
151                     (indirect[idx] == -1 && indirect[0] > 0))
152                         iosize = SJA1000_IOSIZE_INDIRECT;
153                 if (!request_region(port[idx], iosize, DRV_NAME)) {
154                         err = -EBUSY;
155                         goto exit;
156                 }
157         }
158
159         dev = alloc_sja1000dev(0);
160         if (!dev) {
161                 err = -ENOMEM;
162                 goto exit_unmap;
163         }
164         priv = netdev_priv(dev);
165
166         dev->irq = irq[idx];
167         priv->irq_flags = IRQF_SHARED;
168         if (mem[idx]) {
169                 priv->reg_base = base;
170                 dev->base_addr = mem[idx];
171                 priv->read_reg = sja1000_isa_mem_read_reg;
172                 priv->write_reg = sja1000_isa_mem_write_reg;
173         } else {
174                 priv->reg_base = (void __iomem *)port[idx];
175                 dev->base_addr = port[idx];
176
177                 if (iosize == SJA1000_IOSIZE_INDIRECT) {
178                         priv->read_reg = sja1000_isa_port_read_reg_indirect;
179                         priv->write_reg = sja1000_isa_port_write_reg_indirect;
180                 } else {
181                         priv->read_reg = sja1000_isa_port_read_reg;
182                         priv->write_reg = sja1000_isa_port_write_reg;
183                 }
184         }
185
186         if (clk[idx])
187                 priv->can.clock.freq = clk[idx] / 2;
188         else if (clk[0])
189                 priv->can.clock.freq = clk[0] / 2;
190         else
191                 priv->can.clock.freq = CLK_DEFAULT / 2;
192
193         if (ocr[idx] != -1)
194                 priv->ocr = ocr[idx] & 0xff;
195         else if (ocr[0] != -1)
196                 priv->ocr = ocr[0] & 0xff;
197         else
198                 priv->ocr = OCR_DEFAULT;
199
200         if (cdr[idx] != -1)
201                 priv->cdr = cdr[idx] & 0xff;
202         else if (cdr[0] != -1)
203                 priv->cdr = cdr[0] & 0xff;
204         else
205                 priv->cdr = CDR_DEFAULT;
206
207         dev_set_drvdata(pdev, dev);
208         SET_NETDEV_DEV(dev, pdev);
209
210         err = register_sja1000dev(dev);
211         if (err) {
212                 dev_err(pdev, "registering %s failed (err=%d)\n",
213                         DRV_NAME, err);
214                 goto exit_unmap;
215         }
216
217         dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n",
218                  DRV_NAME, priv->reg_base, dev->irq);
219         return 0;
220
221  exit_unmap:
222         if (mem[idx])
223                 iounmap(base);
224  exit_release:
225         if (mem[idx])
226                 release_mem_region(mem[idx], iosize);
227         else
228                 release_region(port[idx], iosize);
229  exit:
230         return err;
231 }
232
233 static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx)
234 {
235         struct net_device *dev = dev_get_drvdata(pdev);
236         struct sja1000_priv *priv = netdev_priv(dev);
237
238         unregister_sja1000dev(dev);
239         dev_set_drvdata(pdev, NULL);
240
241         if (mem[idx]) {
242                 iounmap(priv->reg_base);
243                 release_mem_region(mem[idx], SJA1000_IOSIZE);
244         } else {
245                 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
246                         release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
247                 else
248                         release_region(port[idx], SJA1000_IOSIZE);
249         }
250         free_sja1000dev(dev);
251
252         return 0;
253 }
254
255 static struct isa_driver sja1000_isa_driver = {
256         .match = sja1000_isa_match,
257         .probe = sja1000_isa_probe,
258         .remove = __devexit_p(sja1000_isa_remove),
259         .driver = {
260                 .name = DRV_NAME,
261         },
262 };
263
264 static int __init sja1000_isa_init(void)
265 {
266         int err = isa_register_driver(&sja1000_isa_driver, MAXDEV);
267
268         if (!err)
269                 printk(KERN_INFO
270                        "Legacy %s driver for max. %d devices registered\n",
271                        DRV_NAME, MAXDEV);
272         return err;
273 }
274
275 static void __exit sja1000_isa_exit(void)
276 {
277         isa_unregister_driver(&sja1000_isa_driver);
278 }
279
280 module_init(sja1000_isa_init);
281 module_exit(sja1000_isa_exit);