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1/*
2 * Copyright (C) 2006, 2007 Eugene Konev <ejka@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 * Parts of the VLYNQ specification can be found here:
19 * http://www.ti.com/litv/pdf/sprue36a
20 */
21
22#include <linux/init.h>
23#include <linux/types.h>
24#include <linux/kernel.h>
25#include <linux/string.h>
26#include <linux/device.h>
27#include <linux/module.h>
28#include <linux/errno.h>
29#include <linux/platform_device.h>
30#include <linux/interrupt.h>
31#include <linux/delay.h>
32#include <linux/io.h>
33#include <linux/slab.h>
34#include <linux/irq.h>
35
36#include <linux/vlynq.h>
37
38#define VLYNQ_CTRL_PM_ENABLE 0x80000000
39#define VLYNQ_CTRL_CLOCK_INT 0x00008000
40#define VLYNQ_CTRL_CLOCK_DIV(x) (((x) & 7) << 16)
41#define VLYNQ_CTRL_INT_LOCAL 0x00004000
42#define VLYNQ_CTRL_INT_ENABLE 0x00002000
43#define VLYNQ_CTRL_INT_VECTOR(x) (((x) & 0x1f) << 8)
44#define VLYNQ_CTRL_INT2CFG 0x00000080
45#define VLYNQ_CTRL_RESET 0x00000001
46
47#define VLYNQ_CTRL_CLOCK_MASK (0x7 << 16)
48
49#define VLYNQ_INT_OFFSET 0x00000014
50#define VLYNQ_REMOTE_OFFSET 0x00000080
51
52#define VLYNQ_STATUS_LINK 0x00000001
53#define VLYNQ_STATUS_LERROR 0x00000080
54#define VLYNQ_STATUS_RERROR 0x00000100
55
56#define VINT_ENABLE 0x00000100
57#define VINT_TYPE_EDGE 0x00000080
58#define VINT_LEVEL_LOW 0x00000040
59#define VINT_VECTOR(x) ((x) & 0x1f)
60#define VINT_OFFSET(irq) (8 * ((irq) % 4))
61
62#define VLYNQ_AUTONEGO_V2 0x00010000
63
64struct vlynq_regs {
65 u32 revision;
66 u32 control;
67 u32 status;
68 u32 int_prio;
69 u32 int_status;
70 u32 int_pending;
71 u32 int_ptr;
72 u32 tx_offset;
73 struct vlynq_mapping rx_mapping[4];
74 u32 chip;
75 u32 autonego;
76 u32 unused[6];
77 u32 int_device[8];
78};
79
80#ifdef CONFIG_VLYNQ_DEBUG
81static void vlynq_dump_regs(struct vlynq_device *dev)
82{
83 int i;
84
85 printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
86 dev->local, dev->remote);
87 for (i = 0; i < 32; i++) {
88 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
89 i + 1, ((u32 *)dev->local)[i]);
90 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
91 i + 1, ((u32 *)dev->remote)[i]);
92 }
93}
94
95static void vlynq_dump_mem(u32 *base, int count)
96{
97 int i;
98
99 for (i = 0; i < (count + 3) / 4; i++) {
100 if (i % 4 == 0)
101 printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
102 printk(KERN_DEBUG " 0x%08x", *(base + i));
103 }
104 printk(KERN_DEBUG "\n");
105}
106#endif
107
108/* Check the VLYNQ link status with a given device */
109static int vlynq_linked(struct vlynq_device *dev)
110{
111 int i;
112
113 for (i = 0; i < 100; i++)
114 if (readl(&dev->local->status) & VLYNQ_STATUS_LINK)
115 return 1;
116 else
117 cpu_relax();
118
119 return 0;
120}
121
122static void vlynq_reset(struct vlynq_device *dev)
123{
124 writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
125 &dev->local->control);
126
127 /* Wait for the devices to finish resetting */
128 msleep(5);
129
130 /* Remove reset bit */
131 writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
132 &dev->local->control);
133
134 /* Give some time for the devices to settle */
135 msleep(5);
136}
137
138static void vlynq_irq_unmask(struct irq_data *d)
139{
140 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
141 int virq;
142 u32 val;
143
144 BUG_ON(!dev);
145 virq = d->irq - dev->irq_start;
146 val = readl(&dev->remote->int_device[virq >> 2]);
147 val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
148 writel(val, &dev->remote->int_device[virq >> 2]);
149}
150
151static void vlynq_irq_mask(struct irq_data *d)
152{
153 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
154 int virq;
155 u32 val;
156
157 BUG_ON(!dev);
158 virq = d->irq - dev->irq_start;
159 val = readl(&dev->remote->int_device[virq >> 2]);
160 val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
161 writel(val, &dev->remote->int_device[virq >> 2]);
162}
163
164static int vlynq_irq_type(struct irq_data *d, unsigned int flow_type)
165{
166 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
167 int virq;
168 u32 val;
169
170 BUG_ON(!dev);
171 virq = d->irq - dev->irq_start;
172 val = readl(&dev->remote->int_device[virq >> 2]);
173 switch (flow_type & IRQ_TYPE_SENSE_MASK) {
174 case IRQ_TYPE_EDGE_RISING:
175 case IRQ_TYPE_EDGE_FALLING:
176 case IRQ_TYPE_EDGE_BOTH:
177 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
178 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
179 break;
180 case IRQ_TYPE_LEVEL_HIGH:
181 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
182 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
183 break;
184 case IRQ_TYPE_LEVEL_LOW:
185 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
186 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
187 break;
188 default:
189 return -EINVAL;
190 }
191 writel(val, &dev->remote->int_device[virq >> 2]);
192 return 0;
193}
194
195static void vlynq_local_ack(struct irq_data *d)
196{
197 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
198 u32 status = readl(&dev->local->status);
199
200 pr_debug("%s: local status: 0x%08x\n",
201 dev_name(&dev->dev), status);
202 writel(status, &dev->local->status);
203}
204
205static void vlynq_remote_ack(struct irq_data *d)
206{
207 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
208 u32 status = readl(&dev->remote->status);
209
210 pr_debug("%s: remote status: 0x%08x\n",
211 dev_name(&dev->dev), status);
212 writel(status, &dev->remote->status);
213}
214
215static irqreturn_t vlynq_irq(int irq, void *dev_id)
216{
217 struct vlynq_device *dev = dev_id;
218 u32 status;
219 int virq = 0;
220
221 status = readl(&dev->local->int_status);
222 writel(status, &dev->local->int_status);
223
224 if (unlikely(!status))
225 spurious_interrupt();
226
227 while (status) {
228 if (status & 1)
229 do_IRQ(dev->irq_start + virq);
230 status >>= 1;
231 virq++;
232 }
233
234 return IRQ_HANDLED;
235}
236
237static struct irq_chip vlynq_irq_chip = {
238 .name = "vlynq",
239 .irq_unmask = vlynq_irq_unmask,
240 .irq_mask = vlynq_irq_mask,
241 .irq_set_type = vlynq_irq_type,
242};
243
244static struct irq_chip vlynq_local_chip = {
245 .name = "vlynq local error",
246 .irq_unmask = vlynq_irq_unmask,
247 .irq_mask = vlynq_irq_mask,
248 .irq_ack = vlynq_local_ack,
249};
250
251static struct irq_chip vlynq_remote_chip = {
252 .name = "vlynq local error",
253 .irq_unmask = vlynq_irq_unmask,
254 .irq_mask = vlynq_irq_mask,
255 .irq_ack = vlynq_remote_ack,
256};
257
258static int vlynq_setup_irq(struct vlynq_device *dev)
259{
260 u32 val;
261 int i, virq;
262
263 if (dev->local_irq == dev->remote_irq) {
264 printk(KERN_ERR
265 "%s: local vlynq irq should be different from remote\n",
266 dev_name(&dev->dev));
267 return -EINVAL;
268 }
269
270 /* Clear local and remote error bits */
271 writel(readl(&dev->local->status), &dev->local->status);
272 writel(readl(&dev->remote->status), &dev->remote->status);
273
274 /* Now setup interrupts */
275 val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
276 val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
277 VLYNQ_CTRL_INT2CFG;
278 val |= readl(&dev->local->control);
279 writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
280 writel(val, &dev->local->control);
281
282 val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
283 val |= VLYNQ_CTRL_INT_ENABLE;
284 val |= readl(&dev->remote->control);
285 writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
286 writel(val, &dev->remote->int_ptr);
287 writel(val, &dev->remote->control);
288
289 for (i = dev->irq_start; i <= dev->irq_end; i++) {
290 virq = i - dev->irq_start;
291 if (virq == dev->local_irq) {
292 irq_set_chip_and_handler(i, &vlynq_local_chip,
293 handle_level_irq);
294 irq_set_chip_data(i, dev);
295 } else if (virq == dev->remote_irq) {
296 irq_set_chip_and_handler(i, &vlynq_remote_chip,
297 handle_level_irq);
298 irq_set_chip_data(i, dev);
299 } else {
300 irq_set_chip_and_handler(i, &vlynq_irq_chip,
301 handle_simple_irq);
302 irq_set_chip_data(i, dev);
303 writel(0, &dev->remote->int_device[virq >> 2]);
304 }
305 }
306
307 if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
308 printk(KERN_ERR "%s: request_irq failed\n",
309 dev_name(&dev->dev));
310 return -EAGAIN;
311 }
312
313 return 0;
314}
315
316static void vlynq_device_release(struct device *dev)
317{
318 struct vlynq_device *vdev = to_vlynq_device(dev);
319 kfree(vdev);
320}
321
322static int vlynq_device_match(struct device *dev,
323 struct device_driver *drv)
324{
325 struct vlynq_device *vdev = to_vlynq_device(dev);
326 struct vlynq_driver *vdrv = to_vlynq_driver(drv);
327 struct vlynq_device_id *ids = vdrv->id_table;
328
329 while (ids->id) {
330 if (ids->id == vdev->dev_id) {
331 vdev->divisor = ids->divisor;
332 vlynq_set_drvdata(vdev, ids);
333 printk(KERN_INFO "Driver found for VLYNQ "
334 "device: %08x\n", vdev->dev_id);
335 return 1;
336 }
337 printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
338 " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
339 ids++;
340 }
341 return 0;
342}
343
344static int vlynq_device_probe(struct device *dev)
345{
346 struct vlynq_device *vdev = to_vlynq_device(dev);
347 struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
348 struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
349 int result = -ENODEV;
350
351 if (drv->probe)
352 result = drv->probe(vdev, id);
353 if (result)
354 put_device(dev);
355 return result;
356}
357
358static int vlynq_device_remove(struct device *dev)
359{
360 struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
361
362 if (drv->remove)
363 drv->remove(to_vlynq_device(dev));
364
365 return 0;
366}
367
368int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
369{
370 driver->driver.name = driver->name;
371 driver->driver.bus = &vlynq_bus_type;
372 return driver_register(&driver->driver);
373}
374EXPORT_SYMBOL(__vlynq_register_driver);
375
376void vlynq_unregister_driver(struct vlynq_driver *driver)
377{
378 driver_unregister(&driver->driver);
379}
380EXPORT_SYMBOL(vlynq_unregister_driver);
381
382/*
383 * A VLYNQ remote device can clock the VLYNQ bus master
384 * using a dedicated clock line. In that case, both the
385 * remove device and the bus master should have the same
386 * serial clock dividers configured. Iterate through the
387 * 8 possible dividers until we actually link with the
388 * device.
389 */
390static int __vlynq_try_remote(struct vlynq_device *dev)
391{
392 int i;
393
394 vlynq_reset(dev);
395 for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
396 i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
397 dev->dev_id ? i++ : i--) {
398
399 if (!vlynq_linked(dev))
400 break;
401
402 writel((readl(&dev->remote->control) &
403 ~VLYNQ_CTRL_CLOCK_MASK) |
404 VLYNQ_CTRL_CLOCK_INT |
405 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
406 &dev->remote->control);
407 writel((readl(&dev->local->control)
408 & ~(VLYNQ_CTRL_CLOCK_INT |
409 VLYNQ_CTRL_CLOCK_MASK)) |
410 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
411 &dev->local->control);
412
413 if (vlynq_linked(dev)) {
414 printk(KERN_DEBUG
415 "%s: using remote clock divisor %d\n",
416 dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
417 dev->divisor = i;
418 return 0;
419 } else {
420 vlynq_reset(dev);
421 }
422 }
423
424 return -ENODEV;
425}
426
427/*
428 * A VLYNQ remote device can be clocked by the VLYNQ bus
429 * master using a dedicated clock line. In that case, only
430 * the bus master configures the serial clock divider.
431 * Iterate through the 8 possible dividers until we
432 * actually get a link with the device.
433 */
434static int __vlynq_try_local(struct vlynq_device *dev)
435{
436 int i;
437
438 vlynq_reset(dev);
439
440 for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
441 i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
442 dev->dev_id ? i++ : i--) {
443
444 writel((readl(&dev->local->control) &
445 ~VLYNQ_CTRL_CLOCK_MASK) |
446 VLYNQ_CTRL_CLOCK_INT |
447 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
448 &dev->local->control);
449
450 if (vlynq_linked(dev)) {
451 printk(KERN_DEBUG
452 "%s: using local clock divisor %d\n",
453 dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
454 dev->divisor = i;
455 return 0;
456 } else {
457 vlynq_reset(dev);
458 }
459 }
460
461 return -ENODEV;
462}
463
464/*
465 * When using external clocking method, serial clock
466 * is supplied by an external oscillator, therefore we
467 * should mask the local clock bit in the clock control
468 * register for both the bus master and the remote device.
469 */
470static int __vlynq_try_external(struct vlynq_device *dev)
471{
472 vlynq_reset(dev);
473 if (!vlynq_linked(dev))
474 return -ENODEV;
475
476 writel((readl(&dev->remote->control) &
477 ~VLYNQ_CTRL_CLOCK_INT),
478 &dev->remote->control);
479
480 writel((readl(&dev->local->control) &
481 ~VLYNQ_CTRL_CLOCK_INT),
482 &dev->local->control);
483
484 if (vlynq_linked(dev)) {
485 printk(KERN_DEBUG "%s: using external clock\n",
486 dev_name(&dev->dev));
487 dev->divisor = vlynq_div_external;
488 return 0;
489 }
490
491 return -ENODEV;
492}
493
494static int __vlynq_enable_device(struct vlynq_device *dev)
495{
496 int result;
497 struct plat_vlynq_ops *ops = dev->dev.platform_data;
498
499 result = ops->on(dev);
500 if (result)
501 return result;
502
503 switch (dev->divisor) {
504 case vlynq_div_external:
505 case vlynq_div_auto:
506 /* When the device is brought from reset it should have clock
507 * generation negotiated by hardware.
508 * Check which device is generating clocks and perform setup
509 * accordingly */
510 if (vlynq_linked(dev) && readl(&dev->remote->control) &
511 VLYNQ_CTRL_CLOCK_INT) {
512 if (!__vlynq_try_remote(dev) ||
513 !__vlynq_try_local(dev) ||
514 !__vlynq_try_external(dev))
515 return 0;
516 } else {
517 if (!__vlynq_try_external(dev) ||
518 !__vlynq_try_local(dev) ||
519 !__vlynq_try_remote(dev))
520 return 0;
521 }
522 break;
523 case vlynq_ldiv1:
524 case vlynq_ldiv2:
525 case vlynq_ldiv3:
526 case vlynq_ldiv4:
527 case vlynq_ldiv5:
528 case vlynq_ldiv6:
529 case vlynq_ldiv7:
530 case vlynq_ldiv8:
531 writel(VLYNQ_CTRL_CLOCK_INT |
532 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
533 vlynq_ldiv1), &dev->local->control);
534 writel(0, &dev->remote->control);
535 if (vlynq_linked(dev)) {
536 printk(KERN_DEBUG
537 "%s: using local clock divisor %d\n",
538 dev_name(&dev->dev),
539 dev->divisor - vlynq_ldiv1 + 1);
540 return 0;
541 }
542 break;
543 case vlynq_rdiv1:
544 case vlynq_rdiv2:
545 case vlynq_rdiv3:
546 case vlynq_rdiv4:
547 case vlynq_rdiv5:
548 case vlynq_rdiv6:
549 case vlynq_rdiv7:
550 case vlynq_rdiv8:
551 writel(0, &dev->local->control);
552 writel(VLYNQ_CTRL_CLOCK_INT |
553 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
554 vlynq_rdiv1), &dev->remote->control);
555 if (vlynq_linked(dev)) {
556 printk(KERN_DEBUG
557 "%s: using remote clock divisor %d\n",
558 dev_name(&dev->dev),
559 dev->divisor - vlynq_rdiv1 + 1);
560 return 0;
561 }
562 break;
563 }
564
565 ops->off(dev);
566 return -ENODEV;
567}
568
569int vlynq_enable_device(struct vlynq_device *dev)
570{
571 struct plat_vlynq_ops *ops = dev->dev.platform_data;
572 int result = -ENODEV;
573
574 result = __vlynq_enable_device(dev);
575 if (result)
576 return result;
577
578 result = vlynq_setup_irq(dev);
579 if (result)
580 ops->off(dev);
581
582 dev->enabled = !result;
583 return result;
584}
585EXPORT_SYMBOL(vlynq_enable_device);
586
587
588void vlynq_disable_device(struct vlynq_device *dev)
589{
590 struct plat_vlynq_ops *ops = dev->dev.platform_data;
591
592 dev->enabled = 0;
593 free_irq(dev->irq, dev);
594 ops->off(dev);
595}
596EXPORT_SYMBOL(vlynq_disable_device);
597
598int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
599 struct vlynq_mapping *mapping)
600{
601 int i;
602
603 if (!dev->enabled)
604 return -ENXIO;
605
606 writel(tx_offset, &dev->local->tx_offset);
607 for (i = 0; i < 4; i++) {
608 writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
609 writel(mapping[i].size, &dev->local->rx_mapping[i].size);
610 }
611 return 0;
612}
613EXPORT_SYMBOL(vlynq_set_local_mapping);
614
615int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
616 struct vlynq_mapping *mapping)
617{
618 int i;
619
620 if (!dev->enabled)
621 return -ENXIO;
622
623 writel(tx_offset, &dev->remote->tx_offset);
624 for (i = 0; i < 4; i++) {
625 writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
626 writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
627 }
628 return 0;
629}
630EXPORT_SYMBOL(vlynq_set_remote_mapping);
631
632int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
633{
634 int irq = dev->irq_start + virq;
635 if (dev->enabled)
636 return -EBUSY;
637
638 if ((irq < dev->irq_start) || (irq > dev->irq_end))
639 return -EINVAL;
640
641 if (virq == dev->remote_irq)
642 return -EINVAL;
643
644 dev->local_irq = virq;
645
646 return 0;
647}
648EXPORT_SYMBOL(vlynq_set_local_irq);
649
650int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
651{
652 int irq = dev->irq_start + virq;
653 if (dev->enabled)
654 return -EBUSY;
655
656 if ((irq < dev->irq_start) || (irq > dev->irq_end))
657 return -EINVAL;
658
659 if (virq == dev->local_irq)
660 return -EINVAL;
661
662 dev->remote_irq = virq;
663
664 return 0;
665}
666EXPORT_SYMBOL(vlynq_set_remote_irq);
667
668static int vlynq_probe(struct platform_device *pdev)
669{
670 struct vlynq_device *dev;
671 struct resource *regs_res, *mem_res, *irq_res;
672 int len, result;
673
674 regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
675 if (!regs_res)
676 return -ENODEV;
677
678 mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
679 if (!mem_res)
680 return -ENODEV;
681
682 irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
683 if (!irq_res)
684 return -ENODEV;
685
686 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
687 if (!dev) {
688 printk(KERN_ERR
689 "vlynq: failed to allocate device structure\n");
690 return -ENOMEM;
691 }
692
693 dev->id = pdev->id;
694 dev->dev.bus = &vlynq_bus_type;
695 dev->dev.parent = &pdev->dev;
696 dev_set_name(&dev->dev, "vlynq%d", dev->id);
697 dev->dev.platform_data = pdev->dev.platform_data;
698 dev->dev.release = vlynq_device_release;
699
700 dev->regs_start = regs_res->start;
701 dev->regs_end = regs_res->end;
702 dev->mem_start = mem_res->start;
703 dev->mem_end = mem_res->end;
704
705 len = resource_size(regs_res);
706 if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
707 printk(KERN_ERR "%s: Can't request vlynq registers\n",
708 dev_name(&dev->dev));
709 result = -ENXIO;
710 goto fail_request;
711 }
712
713 dev->local = ioremap(regs_res->start, len);
714 if (!dev->local) {
715 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
716 dev_name(&dev->dev));
717 result = -ENXIO;
718 goto fail_remap;
719 }
720
721 dev->remote = (struct vlynq_regs *)((void *)dev->local +
722 VLYNQ_REMOTE_OFFSET);
723
724 dev->irq = platform_get_irq_byname(pdev, "irq");
725 dev->irq_start = irq_res->start;
726 dev->irq_end = irq_res->end;
727 dev->local_irq = dev->irq_end - dev->irq_start;
728 dev->remote_irq = dev->local_irq - 1;
729
730 if (device_register(&dev->dev))
731 goto fail_register;
732 platform_set_drvdata(pdev, dev);
733
734 printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
735 dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
736 (void *)dev->mem_start);
737
738 dev->dev_id = 0;
739 dev->divisor = vlynq_div_auto;
740 result = __vlynq_enable_device(dev);
741 if (result == 0) {
742 dev->dev_id = readl(&dev->remote->chip);
743 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
744 }
745 if (dev->dev_id)
746 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
747
748 return 0;
749
750fail_register:
751 iounmap(dev->local);
752fail_remap:
753fail_request:
754 release_mem_region(regs_res->start, len);
755 kfree(dev);
756 return result;
757}
758
759static int vlynq_remove(struct platform_device *pdev)
760{
761 struct vlynq_device *dev = platform_get_drvdata(pdev);
762
763 device_unregister(&dev->dev);
764 iounmap(dev->local);
765 release_mem_region(dev->regs_start,
766 dev->regs_end - dev->regs_start + 1);
767
768 kfree(dev);
769
770 return 0;
771}
772
773static struct platform_driver vlynq_platform_driver = {
774 .driver.name = "vlynq",
775 .probe = vlynq_probe,
776 .remove = vlynq_remove,
777};
778
779struct bus_type vlynq_bus_type = {
780 .name = "vlynq",
781 .match = vlynq_device_match,
782 .probe = vlynq_device_probe,
783 .remove = vlynq_device_remove,
784};
785EXPORT_SYMBOL(vlynq_bus_type);
786
787static int vlynq_init(void)
788{
789 int res = 0;
790
791 res = bus_register(&vlynq_bus_type);
792 if (res)
793 goto fail_bus;
794
795 res = platform_driver_register(&vlynq_platform_driver);
796 if (res)
797 goto fail_platform;
798
799 return 0;
800
801fail_platform:
802 bus_unregister(&vlynq_bus_type);
803fail_bus:
804 return res;
805}
806
807static void vlynq_exit(void)
808{
809 platform_driver_unregister(&vlynq_platform_driver);
810 bus_unregister(&vlynq_bus_type);
811}
812
813module_init(vlynq_init);
814module_exit(vlynq_exit);
815

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