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55e331cf
FF		 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>
55e331cf
FF		 31#include <linux/delay.h>
32#include <linux/io.h>
5a0e3ad6 33#include <linux/slab.h>
ca4d3e67 34#include <linux/irq.h>
55e331cf
FF		 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
9e2db5c9 80#ifdef CONFIG_VLYNQ_DEBUG
55e331cf
FF		 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(unsigned int irq)
139{
140 u32 val;
141 struct vlynq_device *dev = get_irq_chip_data(irq);
142 int virq;
143
144 BUG_ON(!dev);
145 virq = 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(unsigned int irq)
152{
153 u32 val;
154 struct vlynq_device *dev = get_irq_chip_data(irq);
155 int virq;
156
157 BUG_ON(!dev);
158 virq = 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(unsigned int irq, unsigned int flow_type)
165{
166 u32 val;
167 struct vlynq_device *dev = get_irq_chip_data(irq);
168 int virq;
169
170 BUG_ON(!dev);
171 virq = 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(unsigned int irq)
196{
197 struct vlynq_device *dev = get_irq_chip_data(irq);
198
199 u32 status = readl(&dev->local->status);
200
201 pr_debug("%s: local status: 0x%08x\n",
202 dev_name(&dev->dev), status);
203 writel(status, &dev->local->status);
204}
205
206static void vlynq_remote_ack(unsigned int irq)
207{
208 struct vlynq_device *dev = get_irq_chip_data(irq);
209
210 u32 status = readl(&dev->remote->status);
211
212 pr_debug("%s: remote status: 0x%08x\n",
213 dev_name(&dev->dev), status);
214 writel(status, &dev->remote->status);
215}
216
217static irqreturn_t vlynq_irq(int irq, void *dev_id)
218{
219 struct vlynq_device *dev = dev_id;
220 u32 status;
221 int virq = 0;
222
223 status = readl(&dev->local->int_status);
224 writel(status, &dev->local->int_status);
225
226 if (unlikely(!status))
227 spurious_interrupt();
228
229 while (status) {
230 if (status & 1)
231 do_IRQ(dev->irq_start + virq);
232 status >>= 1;
233 virq++;
234 }
235
236 return IRQ_HANDLED;
237}
238
239static struct irq_chip vlynq_irq_chip = {
240 .name = "vlynq",
241 .unmask = vlynq_irq_unmask,
242 .mask = vlynq_irq_mask,
243 .set_type = vlynq_irq_type,
244};
245
246static struct irq_chip vlynq_local_chip = {
247 .name = "vlynq local error",
248 .unmask = vlynq_irq_unmask,
249 .mask = vlynq_irq_mask,
250 .ack = vlynq_local_ack,
251};
252
253static struct irq_chip vlynq_remote_chip = {
254 .name = "vlynq local error",
255 .unmask = vlynq_irq_unmask,
256 .mask = vlynq_irq_mask,
257 .ack = vlynq_remote_ack,
258};
259
260static int vlynq_setup_irq(struct vlynq_device *dev)
261{
262 u32 val;
263 int i, virq;
264
265 if (dev->local_irq == dev->remote_irq) {
266 printk(KERN_ERR
267 "%s: local vlynq irq should be different from remote\n",
268 dev_name(&dev->dev));
269 return -EINVAL;
270 }
271
272 /* Clear local and remote error bits */
273 writel(readl(&dev->local->status), &dev->local->status);
274 writel(readl(&dev->remote->status), &dev->remote->status);
275
276 /* Now setup interrupts */
277 val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
278 val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
279 VLYNQ_CTRL_INT2CFG;
280 val |= readl(&dev->local->control);
281 writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
282 writel(val, &dev->local->control);
283
284 val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
285 val |= VLYNQ_CTRL_INT_ENABLE;
286 val |= readl(&dev->remote->control);
287 writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
288 writel(val, &dev->remote->int_ptr);
289 writel(val, &dev->remote->control);
290
291 for (i = dev->irq_start; i <= dev->irq_end; i++) {
292 virq = i - dev->irq_start;
293 if (virq == dev->local_irq) {
294 set_irq_chip_and_handler(i, &vlynq_local_chip,
295 handle_level_irq);
296 set_irq_chip_data(i, dev);
297 } else if (virq == dev->remote_irq) {
298 set_irq_chip_and_handler(i, &vlynq_remote_chip,
299 handle_level_irq);
300 set_irq_chip_data(i, dev);
301 } else {
302 set_irq_chip_and_handler(i, &vlynq_irq_chip,
303 handle_simple_irq);
304 set_irq_chip_data(i, dev);
305 writel(0, &dev->remote->int_device[virq >> 2]);
306 }
307 }
308
309 if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
310 printk(KERN_ERR "%s: request_irq failed\n",
311 dev_name(&dev->dev));
312 return -EAGAIN;
313 }
314
315 return 0;
316}
317
318static void vlynq_device_release(struct device *dev)
319{
320 struct vlynq_device *vdev = to_vlynq_device(dev);
321 kfree(vdev);
322}
323
324static int vlynq_device_match(struct device *dev,
325 struct device_driver *drv)
326{
327 struct vlynq_device *vdev = to_vlynq_device(dev);
328 struct vlynq_driver *vdrv = to_vlynq_driver(drv);
329 struct vlynq_device_id *ids = vdrv->id_table;
330
331 while (ids->id) {
332 if (ids->id == vdev->dev_id) {
333 vdev->divisor = ids->divisor;
334 vlynq_set_drvdata(vdev, ids);
335 printk(KERN_INFO "Driver found for VLYNQ "
336 "device: %08x\n", vdev->dev_id);
337 return 1;
338 }
339 printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
340 " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
341 ids++;
342 }
343 return 0;
344}
345
346static int vlynq_device_probe(struct device *dev)
347{
348 struct vlynq_device *vdev = to_vlynq_device(dev);
349 struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
350 struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
351 int result = -ENODEV;
352
353 if (drv->probe)
354 result = drv->probe(vdev, id);
355 if (result)
356 put_device(dev);
357 return result;
358}
359
360static int vlynq_device_remove(struct device *dev)
361{
362 struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
363
364 if (drv->remove)
365 drv->remove(to_vlynq_device(dev));
366
367 return 0;
368}
369
370int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
371{
372 driver->driver.name = driver->name;
373 driver->driver.bus = &vlynq_bus_type;
374 return driver_register(&driver->driver);
375}
376EXPORT_SYMBOL(__vlynq_register_driver);
377
378void vlynq_unregister_driver(struct vlynq_driver *driver)
379{
380 driver_unregister(&driver->driver);
381}
382EXPORT_SYMBOL(vlynq_unregister_driver);
383
384/*
385 * A VLYNQ remote device can clock the VLYNQ bus master
386 * using a dedicated clock line. In that case, both the
387 * remove device and the bus master should have the same
388 * serial clock dividers configured. Iterate through the
389 * 8 possible dividers until we actually link with the
390 * device.
391 */
392static int __vlynq_try_remote(struct vlynq_device *dev)
393{
394 int i;
395
396 vlynq_reset(dev);
397 for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
398 i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
399 dev->dev_id ? i++ : i--) {
400
401 if (!vlynq_linked(dev))
402 break;
403
404 writel((readl(&dev->remote->control) &
405 ~VLYNQ_CTRL_CLOCK_MASK) |
406 VLYNQ_CTRL_CLOCK_INT |
407 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
408 &dev->remote->control);
409 writel((readl(&dev->local->control)
410 & ~(VLYNQ_CTRL_CLOCK_INT |
411 VLYNQ_CTRL_CLOCK_MASK)) |
412 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
413 &dev->local->control);
414
415 if (vlynq_linked(dev)) {
416 printk(KERN_DEBUG
417 "%s: using remote clock divisor %d\n",
418 dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
419 dev->divisor = i;
420 return 0;
421 } else {
422 vlynq_reset(dev);
423 }
424 }
425
426 return -ENODEV;
427}
428
429/*
430 * A VLYNQ remote device can be clocked by the VLYNQ bus
431 * master using a dedicated clock line. In that case, only
432 * the bus master configures the serial clock divider.
433 * Iterate through the 8 possible dividers until we
434 * actually get a link with the device.
435 */
436static int __vlynq_try_local(struct vlynq_device *dev)
437{
438 int i;
439
440 vlynq_reset(dev);
441
442 for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
443 i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
444 dev->dev_id ? i++ : i--) {
445
446 writel((readl(&dev->local->control) &
447 ~VLYNQ_CTRL_CLOCK_MASK) |
448 VLYNQ_CTRL_CLOCK_INT |
449 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
450 &dev->local->control);
451
452 if (vlynq_linked(dev)) {
453 printk(KERN_DEBUG
454 "%s: using local clock divisor %d\n",
455 dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
456 dev->divisor = i;
457 return 0;
458 } else {
459 vlynq_reset(dev);
460 }
461 }
462
463 return -ENODEV;
464}
465
466/*
467 * When using external clocking method, serial clock
468 * is supplied by an external oscillator, therefore we
469 * should mask the local clock bit in the clock control
470 * register for both the bus master and the remote device.
471 */
472static int __vlynq_try_external(struct vlynq_device *dev)
473{
474 vlynq_reset(dev);
475 if (!vlynq_linked(dev))
476 return -ENODEV;
477
478 writel((readl(&dev->remote->control) &
479 ~VLYNQ_CTRL_CLOCK_INT),
480 &dev->remote->control);
481
482 writel((readl(&dev->local->control) &
483 ~VLYNQ_CTRL_CLOCK_INT),
484 &dev->local->control);
485
486 if (vlynq_linked(dev)) {
487 printk(KERN_DEBUG "%s: using external clock\n",
488 dev_name(&dev->dev));
489 dev->divisor = vlynq_div_external;
490 return 0;
491 }
492
493 return -ENODEV;
494}
495
496static int __vlynq_enable_device(struct vlynq_device *dev)
497{
498 int result;
499 struct plat_vlynq_ops *ops = dev->dev.platform_data;
500
501 result = ops->on(dev);
502 if (result)
503 return result;
504
505 switch (dev->divisor) {
506 case vlynq_div_external:
507 case vlynq_div_auto:
508 /* When the device is brought from reset it should have clock
509 * generation negotiated by hardware.
510 * Check which device is generating clocks and perform setup
511 * accordingly */
512 if (vlynq_linked(dev) && readl(&dev->remote->control) &
513 VLYNQ_CTRL_CLOCK_INT) {
514 if (!__vlynq_try_remote(dev) ||
515 !__vlynq_try_local(dev) ||
516 !__vlynq_try_external(dev))
517 return 0;
518 } else {
519 if (!__vlynq_try_external(dev) ||
520 !__vlynq_try_local(dev) ||
521 !__vlynq_try_remote(dev))
522 return 0;
523 }
524 break;
525 case vlynq_ldiv1:
526 case vlynq_ldiv2:
527 case vlynq_ldiv3:
528 case vlynq_ldiv4:
529 case vlynq_ldiv5:
530 case vlynq_ldiv6:
531 case vlynq_ldiv7:
532 case vlynq_ldiv8:
533 writel(VLYNQ_CTRL_CLOCK_INT |
534 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
535 vlynq_ldiv1), &dev->local->control);
536 writel(0, &dev->remote->control);
537 if (vlynq_linked(dev)) {
538 printk(KERN_DEBUG
539 "%s: using local clock divisor %d\n",
540 dev_name(&dev->dev),
541 dev->divisor - vlynq_ldiv1 + 1);
542 return 0;
543 }
544 break;
545 case vlynq_rdiv1:
546 case vlynq_rdiv2:
547 case vlynq_rdiv3:
548 case vlynq_rdiv4:
549 case vlynq_rdiv5:
550 case vlynq_rdiv6:
551 case vlynq_rdiv7:
552 case vlynq_rdiv8:
553 writel(0, &dev->local->control);
554 writel(VLYNQ_CTRL_CLOCK_INT |
555 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
556 vlynq_rdiv1), &dev->remote->control);
557 if (vlynq_linked(dev)) {
558 printk(KERN_DEBUG
559 "%s: using remote clock divisor %d\n",
560 dev_name(&dev->dev),
561 dev->divisor - vlynq_rdiv1 + 1);
562 return 0;
563 }
564 break;
565 }
566
567 ops->off(dev);
568 return -ENODEV;
569}
570
571int vlynq_enable_device(struct vlynq_device *dev)
572{
573 struct plat_vlynq_ops *ops = dev->dev.platform_data;
574 int result = -ENODEV;
575
576 result = __vlynq_enable_device(dev);
577 if (result)
578 return result;
579
580 result = vlynq_setup_irq(dev);
581 if (result)
582 ops->off(dev);
583
584 dev->enabled = !result;
585 return result;
586}
587EXPORT_SYMBOL(vlynq_enable_device);
588
589
590void vlynq_disable_device(struct vlynq_device *dev)
591{
592 struct plat_vlynq_ops *ops = dev->dev.platform_data;
593
594 dev->enabled = 0;
595 free_irq(dev->irq, dev);
596 ops->off(dev);
597}
598EXPORT_SYMBOL(vlynq_disable_device);
599
600int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
601 struct vlynq_mapping *mapping)
602{
603 int i;
604
605 if (!dev->enabled)
606 return -ENXIO;
607
608 writel(tx_offset, &dev->local->tx_offset);
609 for (i = 0; i < 4; i++) {
610 writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
611 writel(mapping[i].size, &dev->local->rx_mapping[i].size);
612 }
613 return 0;
614}
615EXPORT_SYMBOL(vlynq_set_local_mapping);
616
617int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
618 struct vlynq_mapping *mapping)
619{
620 int i;
621
622 if (!dev->enabled)
623 return -ENXIO;
624
625 writel(tx_offset, &dev->remote->tx_offset);
626 for (i = 0; i < 4; i++) {
627 writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
628 writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
629 }
630 return 0;
631}
632EXPORT_SYMBOL(vlynq_set_remote_mapping);
633
634int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
635{
636 int irq = dev->irq_start + virq;
637 if (dev->enabled)
638 return -EBUSY;
639
640 if ((irq < dev->irq_start) || (irq > dev->irq_end))
641 return -EINVAL;
642
643 if (virq == dev->remote_irq)
644 return -EINVAL;
645
646 dev->local_irq = virq;
647
648 return 0;
649}
650EXPORT_SYMBOL(vlynq_set_local_irq);
651
652int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
653{
654 int irq = dev->irq_start + virq;
655 if (dev->enabled)
656 return -EBUSY;
657
658 if ((irq < dev->irq_start) || (irq > dev->irq_end))
659 return -EINVAL;
660
661 if (virq == dev->local_irq)
662 return -EINVAL;
663
664 dev->remote_irq = virq;
665
666 return 0;
667}
668EXPORT_SYMBOL(vlynq_set_remote_irq);
669
670static int vlynq_probe(struct platform_device *pdev)
671{
672 struct vlynq_device *dev;
673 struct resource *regs_res, *mem_res, *irq_res;
674 int len, result;
675
676 regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
677 if (!regs_res)
678 return -ENODEV;
679
680 mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
681 if (!mem_res)
682 return -ENODEV;
683
684 irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
685 if (!irq_res)
686 return -ENODEV;
687
688 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
689 if (!dev) {
690 printk(KERN_ERR
691 "vlynq: failed to allocate device structure\n");
692 return -ENOMEM;
693 }
694
695 dev->id = pdev->id;
696 dev->dev.bus = &vlynq_bus_type;
697 dev->dev.parent = &pdev->dev;
698 dev_set_name(&dev->dev, "vlynq%d", dev->id);
699 dev->dev.platform_data = pdev->dev.platform_data;
700 dev->dev.release = vlynq_device_release;
701
702 dev->regs_start = regs_res->start;
703 dev->regs_end = regs_res->end;
704 dev->mem_start = mem_res->start;
705 dev->mem_end = mem_res->end;
706
3354f73b 707 len = resource_size(regs_res);
55e331cf
FF		 708 if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
709 printk(KERN_ERR "%s: Can't request vlynq registers\n",
710 dev_name(&dev->dev));
711 result = -ENXIO;
712 goto fail_request;
713 }
714
715 dev->local = ioremap(regs_res->start, len);
716 if (!dev->local) {
717 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
718 dev_name(&dev->dev));
719 result = -ENXIO;
720 goto fail_remap;
721 }
722
723 dev->remote = (struct vlynq_regs *)((void *)dev->local +
724 VLYNQ_REMOTE_OFFSET);
725
726 dev->irq = platform_get_irq_byname(pdev, "irq");
727 dev->irq_start = irq_res->start;
728 dev->irq_end = irq_res->end;
729 dev->local_irq = dev->irq_end - dev->irq_start;
730 dev->remote_irq = dev->local_irq - 1;
731
732 if (device_register(&dev->dev))
733 goto fail_register;
734 platform_set_drvdata(pdev, dev);
735
736 printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
737 dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
738 (void *)dev->mem_start);
739
740 dev->dev_id = 0;
741 dev->divisor = vlynq_div_auto;
742 result = __vlynq_enable_device(dev);
743 if (result == 0) {
744 dev->dev_id = readl(&dev->remote->chip);
745 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
746 }
747 if (dev->dev_id)
748 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
749
750 return 0;
751
752fail_register:
753 iounmap(dev->local);
754fail_remap:
755fail_request:
756 release_mem_region(regs_res->start, len);
757 kfree(dev);
758 return result;
759}
760
761static int vlynq_remove(struct platform_device *pdev)
762{
763 struct vlynq_device *dev = platform_get_drvdata(pdev);
764
765 device_unregister(&dev->dev);
766 iounmap(dev->local);
767 release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
768
769 kfree(dev);
770
771 return 0;
772}
773
774static struct platform_driver vlynq_platform_driver = {
775 .driver.name = "vlynq",
776 .probe = vlynq_probe,
777 .remove = __devexit_p(vlynq_remove),
778};
779
780struct bus_type vlynq_bus_type = {
781 .name = "vlynq",
782 .match = vlynq_device_match,
783 .probe = vlynq_device_probe,
784 .remove = vlynq_device_remove,
785};
786EXPORT_SYMBOL(vlynq_bus_type);
787
788static int __devinit vlynq_init(void)
789{
790 int res = 0;
791
792 res = bus_register(&vlynq_bus_type);
793 if (res)
794 goto fail_bus;
795
796 res = platform_driver_register(&vlynq_platform_driver);
797 if (res)
798 goto fail_platform;
799
800 return 0;
801
802fail_platform:
803 bus_unregister(&vlynq_bus_type);
804fail_bus:
805 return res;
806}
807
808static void __devexit vlynq_exit(void)
809{
810 platform_driver_unregister(&vlynq_platform_driver);
811 bus_unregister(&vlynq_bus_type);
812}
813
814module_init(vlynq_init);
815module_exit(vlynq_exit);
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