cleanup vlynq. drop vlynq-pci
[openwrt/svn-archive/archive.git] / target / linux / ar7 / files / drivers / vlynq / vlynq.c
1 /*
2 * Copyright (C) 2006, 2007 OpenWrt.org
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <linux/init.h>
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/device.h>
24 #include <linux/module.h>
25 #include <linux/errno.h>
26 #include <linux/platform_device.h>
27 #include <linux/interrupt.h>
28 #include <linux/device.h>
29 #include <linux/io.h>
30
31 #include <linux/vlynq.h>
32
33 #define VLYNQ_CTRL_PM_ENABLE 0x80000000
34 #define VLYNQ_CTRL_CLOCK_INT 0x00008000
35 #define VLYNQ_CTRL_CLOCK_DIV(x) (((x) & 7) << 16)
36 #define VLYNQ_CTRL_INT_LOCAL 0x00004000
37 #define VLYNQ_CTRL_INT_ENABLE 0x00002000
38 #define VLYNQ_CTRL_INT_VECTOR(x) (((x) & 0x1f) << 8)
39 #define VLYNQ_CTRL_INT2CFG 0x00000080
40 #define VLYNQ_CTRL_RESET 0x00000001
41
42 #define VLYNQ_INT_OFFSET 0x00000014
43 #define VLYNQ_REMOTE_OFFSET 0x00000080
44
45 #define VLYNQ_STATUS_LINK 0x00000001
46 #define VLYNQ_STATUS_LERROR 0x00000080
47 #define VLYNQ_STATUS_RERROR 0x00000100
48
49 #define VINT_ENABLE 0x00000100
50 #define VINT_TYPE_EDGE 0x00000080
51 #define VINT_LEVEL_LOW 0x00000040
52 #define VINT_VECTOR(x) ((x) & 0x1f)
53 #define VINT_OFFSET(irq) (8 * ((irq) % 4))
54
55 #define VLYNQ_AUTONEGO_V2 0x00010000
56
57 struct vlynq_regs {
58 u32 revision;
59 u32 control;
60 u32 status;
61 u32 int_prio;
62 u32 int_status;
63 u32 int_pending;
64 u32 int_ptr;
65 u32 tx_offset;
66 struct vlynq_mapping rx_mapping[4];
67 u32 chip;
68 u32 autonego;
69 u32 unused[6];
70 u32 int_device[8];
71 } __attribute__ ((packed));
72
73 #define vlynq_reg_read(reg) readl(&(reg))
74 #define vlynq_reg_write(reg, val) writel(val, &(reg))
75
76 static int __vlynq_enable_device(struct vlynq_device *dev);
77
78 #ifdef VLYNQ_DEBUG
79 static void vlynq_dump_regs(struct vlynq_device *dev)
80 {
81 int i;
82 printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
83 dev->local, dev->remote);
84 for (i = 0; i < 32; i++) {
85 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
86 i + 1, ((u32 *)dev->local)[i]);
87 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
88 i + 1, ((u32 *)dev->remote)[i]);
89 }
90 }
91
92 static void vlynq_dump_mem(u32 *base, int count)
93 {
94 int i;
95 for (i = 0; i < (count + 3) / 4; i++) {
96 if (i % 4 == 0) printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
97 printk(KERN_DEBUG " 0x%08x", *(base + i));
98 }
99 printk(KERN_DEBUG "\n");
100 }
101 #endif
102
103 int vlynq_linked(struct vlynq_device *dev)
104 {
105 int i;
106
107 for (i = 0; i < 100; i++)
108 if (vlynq_reg_read(dev->local->status) & VLYNQ_STATUS_LINK)
109 return 1;
110 else
111 cpu_relax();
112
113 return 0;
114 }
115
116 static void vlynq_irq_unmask(unsigned int irq)
117 {
118 u32 val;
119 struct vlynq_device *dev = get_irq_chip_data(irq);
120 int virq;
121
122 BUG_ON(!dev);
123 virq = irq - dev->irq_start;
124 val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
125 val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
126 vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
127 }
128
129 static void vlynq_irq_mask(unsigned int irq)
130 {
131 u32 val;
132 struct vlynq_device *dev = get_irq_chip_data(irq);
133 int virq;
134
135 BUG_ON(!dev);
136 virq = irq - dev->irq_start;
137 val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
138 val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
139 vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
140 }
141
142 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
143 {
144 u32 val;
145 struct vlynq_device *dev = get_irq_chip_data(irq);
146 int virq;
147
148 BUG_ON(!dev);
149 virq = irq - dev->irq_start;
150 val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
151 switch (flow_type & IRQ_TYPE_SENSE_MASK) {
152 case IRQ_TYPE_EDGE_RISING:
153 case IRQ_TYPE_EDGE_FALLING:
154 case IRQ_TYPE_EDGE_BOTH:
155 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
156 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
157 break;
158 case IRQ_TYPE_LEVEL_HIGH:
159 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
160 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
161 break;
162 case IRQ_TYPE_LEVEL_LOW:
163 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
164 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
165 break;
166 default:
167 return -EINVAL;
168 }
169 vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
170 return 0;
171 }
172
173 static void vlynq_local_ack(unsigned int irq)
174 {
175 struct vlynq_device *dev = get_irq_chip_data(irq);
176 u32 status = vlynq_reg_read(dev->local->status);
177 if (printk_ratelimit())
178 printk(KERN_DEBUG "%s: local status: 0x%08x\n",
179 dev->dev.bus_id, status);
180 vlynq_reg_write(dev->local->status, status);
181 }
182
183 static void vlynq_remote_ack(unsigned int irq)
184 {
185 struct vlynq_device *dev = get_irq_chip_data(irq);
186 u32 status = vlynq_reg_read(dev->remote->status);
187 if (printk_ratelimit())
188 printk(KERN_DEBUG "%s: remote status: 0x%08x\n",
189 dev->dev.bus_id, status);
190 vlynq_reg_write(dev->remote->status, status);
191 }
192
193 static irqreturn_t vlynq_irq(int irq, void *dev_id)
194 {
195 struct vlynq_device *dev = dev_id;
196 u32 status;
197 int virq = 0;
198
199 status = vlynq_reg_read(dev->local->int_status);
200 vlynq_reg_write(dev->local->int_status, status);
201
202 if (unlikely(!status))
203 spurious_interrupt();
204
205 while (status) {
206 if (status & 1)
207 do_IRQ(dev->irq_start + virq);
208 status >>= 1;
209 virq++;
210 }
211
212 return IRQ_HANDLED;
213 }
214
215 static struct irq_chip vlynq_irq_chip = {
216 .name = "vlynq",
217 .unmask = vlynq_irq_unmask,
218 .mask = vlynq_irq_mask,
219 .set_type = vlynq_irq_type,
220 };
221
222 static struct irq_chip vlynq_local_chip = {
223 .name = "vlynq local error",
224 .unmask = vlynq_irq_unmask,
225 .mask = vlynq_irq_mask,
226 .ack = vlynq_local_ack,
227 };
228
229 static struct irq_chip vlynq_remote_chip = {
230 .name = "vlynq local error",
231 .unmask = vlynq_irq_unmask,
232 .mask = vlynq_irq_mask,
233 .ack = vlynq_remote_ack,
234 };
235
236 static int vlynq_setup_irq(struct vlynq_device *dev)
237 {
238 u32 val;
239 int i, virq;
240
241 if (dev->local_irq == dev->remote_irq) {
242 printk(KERN_ERR
243 "%s: local vlynq irq should be different from remote\n",
244 dev->dev.bus_id);
245 return -EINVAL;
246 }
247
248 /* Clear local and remote error bits */
249 vlynq_reg_write(dev->local->status, vlynq_reg_read(dev->local->status));
250 vlynq_reg_write(dev->remote->status,
251 vlynq_reg_read(dev->remote->status));
252
253 /* Now setup interrupts */
254 val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
255 val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
256 VLYNQ_CTRL_INT2CFG;
257 val |= vlynq_reg_read(dev->local->control);
258 vlynq_reg_write(dev->local->int_ptr, VLYNQ_INT_OFFSET);
259 vlynq_reg_write(dev->local->control, val);
260
261 val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
262 val |= VLYNQ_CTRL_INT_ENABLE;
263 val |= vlynq_reg_read(dev->remote->control);
264 vlynq_reg_write(dev->remote->int_ptr, VLYNQ_INT_OFFSET);
265 vlynq_reg_write(dev->remote->control, val);
266
267 for (i = dev->irq_start; i <= dev->irq_end; i++) {
268 virq = i - dev->irq_start;
269 if (virq == dev->local_irq) {
270 set_irq_chip_and_handler(i, &vlynq_local_chip,
271 handle_level_irq);
272 set_irq_chip_data(i, dev);
273 } else if (virq == dev->remote_irq) {
274 set_irq_chip_and_handler(i, &vlynq_remote_chip,
275 handle_level_irq);
276 set_irq_chip_data(i, dev);
277 } else {
278 set_irq_chip_and_handler(i, &vlynq_irq_chip,
279 handle_simple_irq);
280 set_irq_chip_data(i, dev);
281 vlynq_reg_write(dev->remote->int_device[virq >> 2], 0);
282 }
283 }
284
285 if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
286 printk(KERN_ERR "%s: request_irq failed\n", dev->dev.bus_id);
287 return -EAGAIN;
288 }
289
290 return 0;
291 }
292
293 static void vlynq_device_release(struct device *dev)
294 {
295 struct vlynq_device *vdev = to_vlynq_device(dev);
296 kfree(vdev);
297 }
298
299 static int vlynq_device_match(struct device *dev,
300 struct device_driver *drv)
301 {
302 struct vlynq_device *vdev = to_vlynq_device(dev);
303 struct vlynq_driver *vdrv = to_vlynq_driver(drv);
304 struct plat_vlynq_ops *ops = dev->platform_data;
305 struct vlynq_device_id *ids = vdrv->id_table;
306 u32 id = 0;
307 int result;
308
309 while (ids->id) {
310 vdev->divisor = ids->divisor;
311 result = __vlynq_enable_device(vdev);
312 if (result == 0) {
313 id = vlynq_reg_read(vdev->remote->chip);
314 ops->off(vdev);
315 if (ids->id == id) {
316 vlynq_set_drvdata(vdev, ids);
317 return 1;
318 }
319 }
320 ids++;
321 }
322 return 0;
323 }
324
325 static int vlynq_device_probe(struct device *dev)
326 {
327 struct vlynq_device *vdev = to_vlynq_device(dev);
328 struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
329 struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
330 int result = -ENODEV;
331
332 get_device(dev);
333 if (drv && drv->probe)
334 result = drv->probe(vdev, id);
335 if (result)
336 put_device(dev);
337 return result;
338 }
339
340 static int vlynq_device_remove(struct device *dev)
341 {
342 struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
343 if (drv && drv->remove)
344 drv->remove(to_vlynq_device(dev));
345 put_device(dev);
346 return 0;
347 }
348
349 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
350 {
351 driver->driver.name = driver->name;
352 driver->driver.bus = &vlynq_bus_type;
353 return driver_register(&driver->driver);
354 }
355 EXPORT_SYMBOL(__vlynq_register_driver);
356
357 void vlynq_unregister_driver(struct vlynq_driver *driver)
358 {
359 driver_unregister(&driver->driver);
360 }
361 EXPORT_SYMBOL(vlynq_unregister_driver);
362
363 static int __vlynq_enable_device(struct vlynq_device *dev)
364 {
365 int i, result;
366 struct plat_vlynq_ops *ops = dev->dev.platform_data;
367
368 result = ops->on(dev);
369 if (result)
370 return result;
371
372 switch (dev->divisor) {
373 case vlynq_div_auto:
374 /* Only try locally supplied clock, others cause problems */
375 vlynq_reg_write(dev->remote->control, 0);
376 for (i = vlynq_ldiv1; i <= vlynq_ldiv8; i++) {
377 vlynq_reg_write(dev->local->control,
378 VLYNQ_CTRL_CLOCK_INT |
379 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1));
380 if (vlynq_linked(dev)) {
381 printk(KERN_DEBUG
382 "%s: using local clock divisor %d\n",
383 dev->dev.bus_id, i - vlynq_ldiv1 + 1);
384 dev->divisor = i;
385 return 0;
386 }
387 }
388 case vlynq_ldiv1: case vlynq_ldiv2: case vlynq_ldiv3: case vlynq_ldiv4:
389 case vlynq_ldiv5: case vlynq_ldiv6: case vlynq_ldiv7: case vlynq_ldiv8:
390 vlynq_reg_write(dev->remote->control, 0);
391 vlynq_reg_write(dev->local->control,
392 VLYNQ_CTRL_CLOCK_INT |
393 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
394 vlynq_ldiv1));
395 if (vlynq_linked(dev)) {
396 printk(KERN_DEBUG
397 "%s: using local clock divisor %d\n",
398 dev->dev.bus_id, dev->divisor - vlynq_ldiv1 + 1);
399 return 0;
400 }
401 break;
402 case vlynq_rdiv1: case vlynq_rdiv2: case vlynq_rdiv3: case vlynq_rdiv4:
403 case vlynq_rdiv5: case vlynq_rdiv6: case vlynq_rdiv7: case vlynq_rdiv8:
404 vlynq_reg_write(dev->local->control, 0);
405 vlynq_reg_write(dev->remote->control,
406 VLYNQ_CTRL_CLOCK_INT |
407 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
408 vlynq_rdiv1));
409 if (vlynq_linked(dev)) {
410 printk(KERN_DEBUG
411 "%s: using remote clock divisor %d\n",
412 dev->dev.bus_id, dev->divisor - vlynq_rdiv1 + 1);
413 return 0;
414 }
415 break;
416 case vlynq_div_external:
417 vlynq_reg_write(dev->local->control, 0);
418 vlynq_reg_write(dev->remote->control, 0);
419 if (vlynq_linked(dev)) {
420 printk(KERN_DEBUG "%s: using external clock\n",
421 dev->dev.bus_id);
422 return 0;
423 }
424 break;
425 }
426
427 ops->off(dev);
428 return -ENODEV;
429 }
430
431 int vlynq_enable_device(struct vlynq_device *dev)
432 {
433 struct plat_vlynq_ops *ops = dev->dev.platform_data;
434 int result = -ENODEV;
435
436 result = __vlynq_enable_device(dev);
437 if (result)
438 return result;
439
440 result = vlynq_setup_irq(dev);
441 if (result)
442 ops->off(dev);
443
444 dev->enabled = !result;
445 return result;
446 }
447 EXPORT_SYMBOL(vlynq_enable_device);
448
449
450 void vlynq_disable_device(struct vlynq_device *dev)
451 {
452 struct plat_vlynq_ops *ops = dev->dev.platform_data;
453
454 dev->enabled = 0;
455 free_irq(dev->irq, dev);
456 ops->off(dev);
457 }
458 EXPORT_SYMBOL(vlynq_disable_device);
459
460 int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
461 struct vlynq_mapping *mapping)
462 {
463 int i;
464
465 if (!dev->enabled)
466 return -ENXIO;
467
468 vlynq_reg_write(dev->local->tx_offset, tx_offset);
469 for (i = 0; i < 4; i++) {
470 vlynq_reg_write(dev->local->rx_mapping[i].offset,
471 mapping[i].offset);
472 vlynq_reg_write(dev->local->rx_mapping[i].size,
473 mapping[i].size);
474 }
475 return 0;
476 }
477 EXPORT_SYMBOL(vlynq_set_local_mapping);
478
479 int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
480 struct vlynq_mapping *mapping)
481 {
482 int i;
483
484 if (!dev->enabled)
485 return -ENXIO;
486
487 vlynq_reg_write(dev->remote->tx_offset, tx_offset);
488 for (i = 0; i < 4; i++) {
489 vlynq_reg_write(dev->remote->rx_mapping[i].offset,
490 mapping[i].offset);
491 vlynq_reg_write(dev->remote->rx_mapping[i].size,
492 mapping[i].size);
493 }
494 return 0;
495 }
496 EXPORT_SYMBOL(vlynq_set_remote_mapping);
497
498 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
499 {
500 int irq = dev->irq_start + virq;
501 if (dev->enabled)
502 return -EBUSY;
503
504 if ((irq < dev->irq_start) || (irq > dev->irq_end))
505 return -EINVAL;
506
507 if (virq == dev->remote_irq)
508 return -EINVAL;
509
510 dev->local_irq = virq;
511
512 return 0;
513 }
514 EXPORT_SYMBOL(vlynq_set_local_irq);
515
516 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
517 {
518 int irq = dev->irq_start + virq;
519 if (dev->enabled)
520 return -EBUSY;
521
522 if ((irq < dev->irq_start) || (irq > dev->irq_end))
523 return -EINVAL;
524
525 if (virq == dev->local_irq)
526 return -EINVAL;
527
528 dev->remote_irq = virq;
529
530 return 0;
531 }
532 EXPORT_SYMBOL(vlynq_set_remote_irq);
533
534 static int vlynq_probe(struct platform_device *pdev)
535 {
536 struct vlynq_device *dev;
537 struct resource *regs_res, *mem_res, *irq_res;
538 int len, result;
539
540 regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
541 if (!regs_res)
542 return -ENODEV;
543
544 mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
545 if (!mem_res)
546 return -ENODEV;
547
548 irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
549 if (!irq_res)
550 return -ENODEV;
551
552 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
553 if (!dev) {
554 printk(KERN_ERR
555 "vlynq: failed to allocate device structure\n");
556 return -ENOMEM;
557 }
558
559 dev->id = pdev->id;
560 dev->dev.bus = &vlynq_bus_type;
561 dev->dev.parent = &pdev->dev;
562 snprintf(dev->dev.bus_id, BUS_ID_SIZE, "vlynq%d", dev->id);
563 dev->dev.bus_id[BUS_ID_SIZE - 1] = 0;
564 dev->dev.platform_data = pdev->dev.platform_data;
565 dev->dev.release = vlynq_device_release;
566
567 dev->regs_start = regs_res->start;
568 dev->regs_end = regs_res->end;
569 dev->mem_start = mem_res->start;
570 dev->mem_end = mem_res->end;
571
572 len = regs_res->end - regs_res->start;
573 if (!request_mem_region(regs_res->start, len, dev->dev.bus_id)) {
574 printk(KERN_ERR "%s: Can't request vlynq registers\n",
575 dev->dev.bus_id);
576 result = -ENXIO;
577 goto fail_request;
578 }
579
580 dev->local = ioremap(regs_res->start, len);
581 if (!dev->local) {
582 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
583 dev->dev.bus_id);
584 result = -ENXIO;
585 goto fail_remap;
586 }
587
588 dev->remote = (struct vlynq_regs *)((void *)dev->local +
589 VLYNQ_REMOTE_OFFSET);
590
591 dev->irq = platform_get_irq_byname(pdev, "irq");
592 dev->irq_start = irq_res->start;
593 dev->irq_end = irq_res->end;
594 dev->local_irq = dev->irq_end - dev->irq_start;
595 dev->remote_irq = dev->local_irq - 1;
596
597 if (device_register(&dev->dev))
598 goto fail_register;
599 platform_set_drvdata(pdev, dev);
600
601 printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
602 dev->dev.bus_id, (void *)dev->regs_start, dev->irq,
603 (void *)dev->mem_start);
604
605 return 0;
606
607 fail_register:
608 iounmap(dev->local);
609 fail_remap:
610 fail_request:
611 release_mem_region(regs_res->start, len);
612 kfree(dev);
613 return result;
614 }
615
616 static int vlynq_remove(struct platform_device *pdev)
617 {
618 struct vlynq_device *dev = platform_get_drvdata(pdev);
619
620 device_unregister(&dev->dev);
621 iounmap(dev->local);
622 release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
623
624 kfree(dev);
625
626 return 0;
627 }
628
629 static struct platform_driver vlynq_driver = {
630 .driver.name = "vlynq",
631 .probe = vlynq_probe,
632 .remove = __devexit_p(vlynq_remove),
633 };
634
635 struct bus_type vlynq_bus_type = {
636 .name = "vlynq",
637 .match = vlynq_device_match,
638 .probe = vlynq_device_probe,
639 .remove = vlynq_device_remove,
640 };
641 EXPORT_SYMBOL(vlynq_bus_type);
642
643 static int __devinit vlynq_init(void)
644 {
645 int res = 0;
646
647 res = bus_register(&vlynq_bus_type);
648 if (res)
649 goto fail_bus;
650
651 res = platform_driver_register(&vlynq_driver);
652 if (res)
653 goto fail_platform;
654
655 return 0;
656
657 fail_platform:
658 bus_unregister(&vlynq_bus_type);
659 fail_bus:
660 return res;
661 }
662
663 static void __devexit vlynq_exit(void)
664 {
665 platform_driver_unregister(&vlynq_driver);
666 bus_unregister(&vlynq_bus_type);
667 }
668
669 module_init(vlynq_init);
670 module_exit(vlynq_exit);