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17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/interrupt.h>
21#include <linux/netdevice.h>
22#include <linux/delay.h>
23#include <linux/irq.h>
24#include <linux/io.h>
25#include <linux/can/dev.h>
26#include <linux/can/platform/sja1000.h>
27
28#include "sja1000.h"
29
30#define DRV_NAME "sja1000_isa"
31
32#define MAXDEV 8
33
34MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
35MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
36MODULE_LICENSE("GPL v2");
37
38#define CLK_DEFAULT 16000000
39#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
40#define OCR_DEFAULT OCR_TX0_PUSHPULL
41
42static unsigned long port[MAXDEV];
43static unsigned long mem[MAXDEV];
44static int irq[MAXDEV];
45static int clk[MAXDEV];
46static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
47static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
48static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
49static spinlock_t indirect_lock[MAXDEV];
50
51module_param_hw_array(port, ulong, ioport, NULL, 0444);
52MODULE_PARM_DESC(port, "I/O port number");
53
54module_param_hw_array(mem, ulong, iomem, NULL, 0444);
55MODULE_PARM_DESC(mem, "I/O memory address");
56
57module_param_hw_array(indirect, int, ioport, NULL, 0444);
58MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
59
60module_param_hw_array(irq, int, irq, NULL, 0444);
61MODULE_PARM_DESC(irq, "IRQ number");
62
63module_param_array(clk, int, NULL, 0444);
64MODULE_PARM_DESC(clk, "External oscillator clock frequency "
65 "(default=16000000 [16 MHz])");
66
67module_param_array(cdr, byte, NULL, 0444);
68MODULE_PARM_DESC(cdr, "Clock divider register "
69 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
70
71module_param_array(ocr, byte, NULL, 0444);
72MODULE_PARM_DESC(ocr, "Output control register "
73 "(default=0x18 [OCR_TX0_PUSHPULL])");
74
75#define SJA1000_IOSIZE 0x20
76#define SJA1000_IOSIZE_INDIRECT 0x02
77
78static struct platform_device *sja1000_isa_devs[MAXDEV];
79
80static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
81{
82 return readb(priv->reg_base + reg);
83}
84
85static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
86 int reg, u8 val)
87{
88 writeb(val, priv->reg_base + reg);
89}
90
91static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
92{
93 return inb((unsigned long)priv->reg_base + reg);
94}
95
96static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
97 int reg, u8 val)
98{
99 outb(val, (unsigned long)priv->reg_base + reg);
100}
101
102static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
103 int reg)
104{
105 unsigned long flags, base = (unsigned long)priv->reg_base;
106 u8 readval;
107
108 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
109 outb(reg, base);
110 readval = inb(base + 1);
111 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
112
113 return readval;
114}
115
116static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
117 int reg, u8 val)
118{
119 unsigned long flags, base = (unsigned long)priv->reg_base;
120
121 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
122 outb(reg, base);
123 outb(val, base + 1);
124 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
125}
126
127static int sja1000_isa_probe(struct platform_device *pdev)
128{
129 struct net_device *dev;
130 struct sja1000_priv *priv;
131 void __iomem *base = NULL;
132 int iosize = SJA1000_IOSIZE;
133 int idx = pdev->id;
134 int err;
135
136 dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
137 idx, port[idx], mem[idx], irq[idx]);
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 spin_lock_init(&indirect_lock[idx]);
181 } else {
182 priv->read_reg = sja1000_isa_port_read_reg;
183 priv->write_reg = sja1000_isa_port_write_reg;
184 }
185 }
186
187 if (clk[idx])
188 priv->can.clock.freq = clk[idx] / 2;
189 else if (clk[0])
190 priv->can.clock.freq = clk[0] / 2;
191 else
192 priv->can.clock.freq = CLK_DEFAULT / 2;
193
194 if (ocr[idx] != 0xff)
195 priv->ocr = ocr[idx];
196 else if (ocr[0] != 0xff)
197 priv->ocr = ocr[0];
198 else
199 priv->ocr = OCR_DEFAULT;
200
201 if (cdr[idx] != 0xff)
202 priv->cdr = cdr[idx];
203 else if (cdr[0] != 0xff)
204 priv->cdr = cdr[0];
205 else
206 priv->cdr = CDR_DEFAULT;
207
208 platform_set_drvdata(pdev, dev);
209 SET_NETDEV_DEV(dev, &pdev->dev);
210 dev->dev_id = idx;
211
212 err = register_sja1000dev(dev);
213 if (err) {
214 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
215 DRV_NAME, err);
216 goto exit_unmap;
217 }
218
219 dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
220 DRV_NAME, priv->reg_base, dev->irq);
221 return 0;
222
223 exit_unmap:
224 if (mem[idx])
225 iounmap(base);
226 exit_release:
227 if (mem[idx])
228 release_mem_region(mem[idx], iosize);
229 else
230 release_region(port[idx], iosize);
231 exit:
232 return err;
233}
234
235static int sja1000_isa_remove(struct platform_device *pdev)
236{
237 struct net_device *dev = platform_get_drvdata(pdev);
238 struct sja1000_priv *priv = netdev_priv(dev);
239 int idx = pdev->id;
240
241 unregister_sja1000dev(dev);
242
243 if (mem[idx]) {
244 iounmap(priv->reg_base);
245 release_mem_region(mem[idx], SJA1000_IOSIZE);
246 } else {
247 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
248 release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
249 else
250 release_region(port[idx], SJA1000_IOSIZE);
251 }
252 free_sja1000dev(dev);
253
254 return 0;
255}
256
257static struct platform_driver sja1000_isa_driver = {
258 .probe = sja1000_isa_probe,
259 .remove = sja1000_isa_remove,
260 .driver = {
261 .name = DRV_NAME,
262 },
263};
264
265static int __init sja1000_isa_init(void)
266{
267 int idx, err;
268
269 for (idx = 0; idx < MAXDEV; idx++) {
270 if ((port[idx] || mem[idx]) && irq[idx]) {
271 sja1000_isa_devs[idx] =
272 platform_device_alloc(DRV_NAME, idx);
273 if (!sja1000_isa_devs[idx]) {
274 err = -ENOMEM;
275 goto exit_free_devices;
276 }
277 err = platform_device_add(sja1000_isa_devs[idx]);
278 if (err) {
279 platform_device_put(sja1000_isa_devs[idx]);
280 goto exit_free_devices;
281 }
282 pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "
283 "irq=%d\n",
284 DRV_NAME, idx, port[idx], mem[idx], irq[idx]);
285 } else if (idx == 0 || port[idx] || mem[idx]) {
286 pr_err("%s: insufficient parameters supplied\n",
287 DRV_NAME);
288 err = -EINVAL;
289 goto exit_free_devices;
290 }
291 }
292
293 err = platform_driver_register(&sja1000_isa_driver);
294 if (err)
295 goto exit_free_devices;
296
297 pr_info("Legacy %s driver for max. %d devices registered\n",
298 DRV_NAME, MAXDEV);
299
300 return 0;
301
302exit_free_devices:
303 while (--idx >= 0) {
304 if (sja1000_isa_devs[idx])
305 platform_device_unregister(sja1000_isa_devs[idx]);
306 }
307
308 return err;
309}
310
311static void __exit sja1000_isa_exit(void)
312{
313 int idx;
314
315 platform_driver_unregister(&sja1000_isa_driver);
316 for (idx = 0; idx < MAXDEV; idx++) {
317 if (sja1000_isa_devs[idx])
318 platform_device_unregister(sja1000_isa_devs[idx]);
319 }
320}
321
322module_init(sja1000_isa_init);
323module_exit(sja1000_isa_exit);
324
