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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
36MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
37MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
38MODULE_LICENSE("GPL v2");
39
40#define CLK_DEFAULT 16000000
41#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
42#define OCR_DEFAULT OCR_TX0_PUSHPULL
43
44static unsigned long port[MAXDEV];
45static unsigned long mem[MAXDEV];
46static int __devinitdata irq[MAXDEV];
47static int __devinitdata clk[MAXDEV];
48static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
49static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
50static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
51
52module_param_array(port, ulong, NULL, S_IRUGO);
53MODULE_PARM_DESC(port, "I/O port number");
54
55module_param_array(mem, ulong, NULL, S_IRUGO);
56MODULE_PARM_DESC(mem, "I/O memory address");
57
58module_param_array(indirect, byte, NULL, S_IRUGO);
59MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
60
61module_param_array(irq, int, NULL, S_IRUGO);
62MODULE_PARM_DESC(irq, "IRQ number");
63
64module_param_array(clk, int, NULL, S_IRUGO);
65MODULE_PARM_DESC(clk, "External oscillator clock frequency "
66 "(default=16000000 [16 MHz])");
67
68module_param_array(cdr, byte, NULL, S_IRUGO);
69MODULE_PARM_DESC(cdr, "Clock divider register "
70 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
71
72module_param_array(ocr, byte, NULL, S_IRUGO);
73MODULE_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
79static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
80{
81 return readb(priv->reg_base + reg);
82}
83
84static 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
90static 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
95static 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
101static 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
110static 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
119static 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
131static 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
233static 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
255static 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
264static 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
275static void __exit sja1000_isa_exit(void)
276{
277 isa_unregister_driver(&sja1000_isa_driver);
278}
279
280module_init(sja1000_isa_init);
281module_exit(sja1000_isa_exit);
282
