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50#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
51
52#include <linux/kernel.h>
53#include <linux/module.h>
54#include <linux/platform_device.h>
55#include <linux/interrupt.h>
56#include <linux/netdevice.h>
57#include <linux/delay.h>
58#include <linux/irq.h>
59#include <linux/io.h>
60#include <linux/can.h>
61#include <linux/can/dev.h>
62#include <linux/can/platform/cc770.h>
63
64#include "cc770.h"
65
66#define MAXDEV 8
67
68MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
69MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the ISA bus");
70MODULE_LICENSE("GPL v2");
71
72#define CLK_DEFAULT 16000000
73#define COR_DEFAULT 0x00
74#define BCR_DEFAULT BUSCFG_CBY
75
76static unsigned long port[MAXDEV];
77static unsigned long mem[MAXDEV];
78static int irq[MAXDEV];
79static int clk[MAXDEV];
80static u8 cir[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
81static u8 cor[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
82static u8 bcr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
83static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
84
85module_param_hw_array(port, ulong, ioport, NULL, 0444);
86MODULE_PARM_DESC(port, "I/O port number");
87
88module_param_hw_array(mem, ulong, iomem, NULL, 0444);
89MODULE_PARM_DESC(mem, "I/O memory address");
90
91module_param_hw_array(indirect, int, ioport, NULL, 0444);
92MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
93
94module_param_hw_array(irq, int, irq, NULL, 0444);
95MODULE_PARM_DESC(irq, "IRQ number");
96
97module_param_array(clk, int, NULL, 0444);
98MODULE_PARM_DESC(clk, "External oscillator clock frequency "
99 "(default=16000000 [16 MHz])");
100
101module_param_array(cir, byte, NULL, 0444);
102MODULE_PARM_DESC(cir, "CPU interface register (default=0x40 [DSC])");
103
104module_param_array(cor, byte, NULL, 0444);
105MODULE_PARM_DESC(cor, "Clockout register (default=0x00)");
106
107module_param_array(bcr, byte, NULL, 0444);
108MODULE_PARM_DESC(bcr, "Bus configuration register (default=0x40 [CBY])");
109
110#define CC770_IOSIZE 0x20
111#define CC770_IOSIZE_INDIRECT 0x02
112
113
114
115
116static DEFINE_SPINLOCK(cc770_isa_port_lock);
117
118static struct platform_device *cc770_isa_devs[MAXDEV];
119
120static u8 cc770_isa_mem_read_reg(const struct cc770_priv *priv, int reg)
121{
122 return readb(priv->reg_base + reg);
123}
124
125static void cc770_isa_mem_write_reg(const struct cc770_priv *priv,
126 int reg, u8 val)
127{
128 writeb(val, priv->reg_base + reg);
129}
130
131static u8 cc770_isa_port_read_reg(const struct cc770_priv *priv, int reg)
132{
133 return inb((unsigned long)priv->reg_base + reg);
134}
135
136static void cc770_isa_port_write_reg(const struct cc770_priv *priv,
137 int reg, u8 val)
138{
139 outb(val, (unsigned long)priv->reg_base + reg);
140}
141
142static u8 cc770_isa_port_read_reg_indirect(const struct cc770_priv *priv,
143 int reg)
144{
145 unsigned long base = (unsigned long)priv->reg_base;
146 unsigned long flags;
147 u8 val;
148
149 spin_lock_irqsave(&cc770_isa_port_lock, flags);
150 outb(reg, base);
151 val = inb(base + 1);
152 spin_unlock_irqrestore(&cc770_isa_port_lock, flags);
153
154 return val;
155}
156
157static void cc770_isa_port_write_reg_indirect(const struct cc770_priv *priv,
158 int reg, u8 val)
159{
160 unsigned long base = (unsigned long)priv->reg_base;
161 unsigned long flags;
162
163 spin_lock_irqsave(&cc770_isa_port_lock, flags);
164 outb(reg, base);
165 outb(val, base + 1);
166 spin_unlock_irqrestore(&cc770_isa_port_lock, flags);
167}
168
169static int cc770_isa_probe(struct platform_device *pdev)
170{
171 struct net_device *dev;
172 struct cc770_priv *priv;
173 void __iomem *base = NULL;
174 int iosize = CC770_IOSIZE;
175 int idx = pdev->id;
176 int err;
177 u32 clktmp;
178
179 dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
180 idx, port[idx], mem[idx], irq[idx]);
181 if (mem[idx]) {
182 if (!request_mem_region(mem[idx], iosize, KBUILD_MODNAME)) {
183 err = -EBUSY;
184 goto exit;
185 }
186 base = ioremap_nocache(mem[idx], iosize);
187 if (!base) {
188 err = -ENOMEM;
189 goto exit_release;
190 }
191 } else {
192 if (indirect[idx] > 0 ||
193 (indirect[idx] == -1 && indirect[0] > 0))
194 iosize = CC770_IOSIZE_INDIRECT;
195 if (!request_region(port[idx], iosize, KBUILD_MODNAME)) {
196 err = -EBUSY;
197 goto exit;
198 }
199 }
200
201 dev = alloc_cc770dev(0);
202 if (!dev) {
203 err = -ENOMEM;
204 goto exit_unmap;
205 }
206 priv = netdev_priv(dev);
207
208 dev->irq = irq[idx];
209 priv->irq_flags = IRQF_SHARED;
210 if (mem[idx]) {
211 priv->reg_base = base;
212 dev->base_addr = mem[idx];
213 priv->read_reg = cc770_isa_mem_read_reg;
214 priv->write_reg = cc770_isa_mem_write_reg;
215 } else {
216 priv->reg_base = (void __iomem *)port[idx];
217 dev->base_addr = port[idx];
218
219 if (iosize == CC770_IOSIZE_INDIRECT) {
220 priv->read_reg = cc770_isa_port_read_reg_indirect;
221 priv->write_reg = cc770_isa_port_write_reg_indirect;
222 } else {
223 priv->read_reg = cc770_isa_port_read_reg;
224 priv->write_reg = cc770_isa_port_write_reg;
225 }
226 }
227
228 if (clk[idx])
229 clktmp = clk[idx];
230 else if (clk[0])
231 clktmp = clk[0];
232 else
233 clktmp = CLK_DEFAULT;
234 priv->can.clock.freq = clktmp;
235
236 if (cir[idx] != 0xff) {
237 priv->cpu_interface = cir[idx];
238 } else if (cir[0] != 0xff) {
239 priv->cpu_interface = cir[0];
240 } else {
241
242 if (clktmp > 10000000) {
243 priv->cpu_interface |= CPUIF_DSC;
244 clktmp /= 2;
245 }
246
247 if (clktmp > 8000000)
248 priv->cpu_interface |= CPUIF_DMC;
249 }
250
251 if (priv->cpu_interface & CPUIF_DSC)
252 priv->can.clock.freq /= 2;
253
254 if (bcr[idx] != 0xff)
255 priv->bus_config = bcr[idx];
256 else if (bcr[0] != 0xff)
257 priv->bus_config = bcr[0];
258 else
259 priv->bus_config = BCR_DEFAULT;
260
261 if (cor[idx] != 0xff)
262 priv->clkout = cor[idx];
263 else if (cor[0] != 0xff)
264 priv->clkout = cor[0];
265 else
266 priv->clkout = COR_DEFAULT;
267
268 platform_set_drvdata(pdev, dev);
269 SET_NETDEV_DEV(dev, &pdev->dev);
270
271 err = register_cc770dev(dev);
272 if (err) {
273 dev_err(&pdev->dev,
274 "couldn't register device (err=%d)\n", err);
275 goto exit_unmap;
276 }
277
278 dev_info(&pdev->dev, "device registered (reg_base=0x%p, irq=%d)\n",
279 priv->reg_base, dev->irq);
280 return 0;
281
282 exit_unmap:
283 if (mem[idx])
284 iounmap(base);
285 exit_release:
286 if (mem[idx])
287 release_mem_region(mem[idx], iosize);
288 else
289 release_region(port[idx], iosize);
290 exit:
291 return err;
292}
293
294static int cc770_isa_remove(struct platform_device *pdev)
295{
296 struct net_device *dev = platform_get_drvdata(pdev);
297 struct cc770_priv *priv = netdev_priv(dev);
298 int idx = pdev->id;
299
300 unregister_cc770dev(dev);
301
302 if (mem[idx]) {
303 iounmap(priv->reg_base);
304 release_mem_region(mem[idx], CC770_IOSIZE);
305 } else {
306 if (priv->read_reg == cc770_isa_port_read_reg_indirect)
307 release_region(port[idx], CC770_IOSIZE_INDIRECT);
308 else
309 release_region(port[idx], CC770_IOSIZE);
310 }
311 free_cc770dev(dev);
312
313 return 0;
314}
315
316static struct platform_driver cc770_isa_driver = {
317 .probe = cc770_isa_probe,
318 .remove = cc770_isa_remove,
319 .driver = {
320 .name = KBUILD_MODNAME,
321 },
322};
323
324static int __init cc770_isa_init(void)
325{
326 int idx, err;
327
328 for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) {
329 if ((port[idx] || mem[idx]) && irq[idx]) {
330 cc770_isa_devs[idx] =
331 platform_device_alloc(KBUILD_MODNAME, idx);
332 if (!cc770_isa_devs[idx]) {
333 err = -ENOMEM;
334 goto exit_free_devices;
335 }
336 err = platform_device_add(cc770_isa_devs[idx]);
337 if (err) {
338 platform_device_put(cc770_isa_devs[idx]);
339 goto exit_free_devices;
340 }
341 pr_debug("platform device %d: port=%#lx, mem=%#lx, "
342 "irq=%d\n",
343 idx, port[idx], mem[idx], irq[idx]);
344 } else if (idx == 0 || port[idx] || mem[idx]) {
345 pr_err("insufficient parameters supplied\n");
346 err = -EINVAL;
347 goto exit_free_devices;
348 }
349 }
350
351 err = platform_driver_register(&cc770_isa_driver);
352 if (err)
353 goto exit_free_devices;
354
355 pr_info("driver for max. %d devices registered\n", MAXDEV);
356
357 return 0;
358
359exit_free_devices:
360 while (--idx >= 0) {
361 if (cc770_isa_devs[idx])
362 platform_device_unregister(cc770_isa_devs[idx]);
363 }
364
365 return err;
366}
367module_init(cc770_isa_init);
368
369static void __exit cc770_isa_exit(void)
370{
371 int idx;
372
373 platform_driver_unregister(&cc770_isa_driver);
374 for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) {
375 if (cc770_isa_devs[idx])
376 platform_device_unregister(cc770_isa_devs[idx]);
377 }
378}
379module_exit(cc770_isa_exit);
380
