GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / vlynq / vlynq.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2006, 2007 Eugene Konev <ejka@openwrt.org>
4  *
5  * Parts of the VLYNQ specification can be found here:
6  * http://www.ti.com/litv/pdf/sprue36a
7  */
8
9 #include <linux/init.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/platform_device.h>
17 #include <linux/interrupt.h>
18 #include <linux/delay.h>
19 #include <linux/io.h>
20 #include <linux/slab.h>
21 #include <linux/irq.h>
22
23 #include <linux/vlynq.h>
24
25 #define VLYNQ_CTRL_PM_ENABLE            0x80000000
26 #define VLYNQ_CTRL_CLOCK_INT            0x00008000
27 #define VLYNQ_CTRL_CLOCK_DIV(x)         (((x) & 7) << 16)
28 #define VLYNQ_CTRL_INT_LOCAL            0x00004000
29 #define VLYNQ_CTRL_INT_ENABLE           0x00002000
30 #define VLYNQ_CTRL_INT_VECTOR(x)        (((x) & 0x1f) << 8)
31 #define VLYNQ_CTRL_INT2CFG              0x00000080
32 #define VLYNQ_CTRL_RESET                0x00000001
33
34 #define VLYNQ_CTRL_CLOCK_MASK          (0x7 << 16)
35
36 #define VLYNQ_INT_OFFSET                0x00000014
37 #define VLYNQ_REMOTE_OFFSET             0x00000080
38
39 #define VLYNQ_STATUS_LINK               0x00000001
40 #define VLYNQ_STATUS_LERROR             0x00000080
41 #define VLYNQ_STATUS_RERROR             0x00000100
42
43 #define VINT_ENABLE                     0x00000100
44 #define VINT_TYPE_EDGE                  0x00000080
45 #define VINT_LEVEL_LOW                  0x00000040
46 #define VINT_VECTOR(x)                  ((x) & 0x1f)
47 #define VINT_OFFSET(irq)                (8 * ((irq) % 4))
48
49 #define VLYNQ_AUTONEGO_V2               0x00010000
50
51 struct vlynq_regs {
52         u32 revision;
53         u32 control;
54         u32 status;
55         u32 int_prio;
56         u32 int_status;
57         u32 int_pending;
58         u32 int_ptr;
59         u32 tx_offset;
60         struct vlynq_mapping rx_mapping[4];
61         u32 chip;
62         u32 autonego;
63         u32 unused[6];
64         u32 int_device[8];
65 };
66
67 #ifdef CONFIG_VLYNQ_DEBUG
68 static void vlynq_dump_regs(struct vlynq_device *dev)
69 {
70         int i;
71
72         printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
73                         dev->local, dev->remote);
74         for (i = 0; i < 32; i++) {
75                 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
76                         i + 1, ((u32 *)dev->local)[i]);
77                 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
78                         i + 1, ((u32 *)dev->remote)[i]);
79         }
80 }
81
82 static void vlynq_dump_mem(u32 *base, int count)
83 {
84         int i;
85
86         for (i = 0; i < (count + 3) / 4; i++) {
87                 if (i % 4 == 0)
88                         printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
89                 printk(KERN_DEBUG " 0x%08x", *(base + i));
90         }
91         printk(KERN_DEBUG "\n");
92 }
93 #endif
94
95 /* Check the VLYNQ link status with a given device */
96 static int vlynq_linked(struct vlynq_device *dev)
97 {
98         int i;
99
100         for (i = 0; i < 100; i++)
101                 if (readl(&dev->local->status) & VLYNQ_STATUS_LINK)
102                         return 1;
103                 else
104                         cpu_relax();
105
106         return 0;
107 }
108
109 static void vlynq_reset(struct vlynq_device *dev)
110 {
111         writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
112                         &dev->local->control);
113
114         /* Wait for the devices to finish resetting */
115         msleep(5);
116
117         /* Remove reset bit */
118         writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
119                         &dev->local->control);
120
121         /* Give some time for the devices to settle */
122         msleep(5);
123 }
124
125 static void vlynq_irq_unmask(struct irq_data *d)
126 {
127         struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
128         int virq;
129         u32 val;
130
131         BUG_ON(!dev);
132         virq = d->irq - dev->irq_start;
133         val = readl(&dev->remote->int_device[virq >> 2]);
134         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
135         writel(val, &dev->remote->int_device[virq >> 2]);
136 }
137
138 static void vlynq_irq_mask(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 << VINT_OFFSET(virq));
148         writel(val, &dev->remote->int_device[virq >> 2]);
149 }
150
151 static int vlynq_irq_type(struct irq_data *d, unsigned int flow_type)
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         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
161         case IRQ_TYPE_EDGE_RISING:
162         case IRQ_TYPE_EDGE_FALLING:
163         case IRQ_TYPE_EDGE_BOTH:
164                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
165                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
166                 break;
167         case IRQ_TYPE_LEVEL_HIGH:
168                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
169                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
170                 break;
171         case IRQ_TYPE_LEVEL_LOW:
172                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
173                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
174                 break;
175         default:
176                 return -EINVAL;
177         }
178         writel(val, &dev->remote->int_device[virq >> 2]);
179         return 0;
180 }
181
182 static void vlynq_local_ack(struct irq_data *d)
183 {
184         struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
185         u32 status = readl(&dev->local->status);
186
187         pr_debug("%s: local status: 0x%08x\n",
188                        dev_name(&dev->dev), status);
189         writel(status, &dev->local->status);
190 }
191
192 static void vlynq_remote_ack(struct irq_data *d)
193 {
194         struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
195         u32 status = readl(&dev->remote->status);
196
197         pr_debug("%s: remote status: 0x%08x\n",
198                        dev_name(&dev->dev), status);
199         writel(status, &dev->remote->status);
200 }
201
202 static irqreturn_t vlynq_irq(int irq, void *dev_id)
203 {
204         struct vlynq_device *dev = dev_id;
205         u32 status;
206         int virq = 0;
207
208         status = readl(&dev->local->int_status);
209         writel(status, &dev->local->int_status);
210
211         if (unlikely(!status))
212                 spurious_interrupt();
213
214         while (status) {
215                 if (status & 1)
216                         do_IRQ(dev->irq_start + virq);
217                 status >>= 1;
218                 virq++;
219         }
220
221         return IRQ_HANDLED;
222 }
223
224 static struct irq_chip vlynq_irq_chip = {
225         .name = "vlynq",
226         .irq_unmask = vlynq_irq_unmask,
227         .irq_mask = vlynq_irq_mask,
228         .irq_set_type = vlynq_irq_type,
229 };
230
231 static struct irq_chip vlynq_local_chip = {
232         .name = "vlynq local error",
233         .irq_unmask = vlynq_irq_unmask,
234         .irq_mask = vlynq_irq_mask,
235         .irq_ack = vlynq_local_ack,
236 };
237
238 static struct irq_chip vlynq_remote_chip = {
239         .name = "vlynq local error",
240         .irq_unmask = vlynq_irq_unmask,
241         .irq_mask = vlynq_irq_mask,
242         .irq_ack = vlynq_remote_ack,
243 };
244
245 static int vlynq_setup_irq(struct vlynq_device *dev)
246 {
247         u32 val;
248         int i, virq;
249
250         if (dev->local_irq == dev->remote_irq) {
251                 printk(KERN_ERR
252                        "%s: local vlynq irq should be different from remote\n",
253                        dev_name(&dev->dev));
254                 return -EINVAL;
255         }
256
257         /* Clear local and remote error bits */
258         writel(readl(&dev->local->status), &dev->local->status);
259         writel(readl(&dev->remote->status), &dev->remote->status);
260
261         /* Now setup interrupts */
262         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
263         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
264                 VLYNQ_CTRL_INT2CFG;
265         val |= readl(&dev->local->control);
266         writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
267         writel(val, &dev->local->control);
268
269         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
270         val |= VLYNQ_CTRL_INT_ENABLE;
271         val |= readl(&dev->remote->control);
272         writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
273         writel(val, &dev->remote->int_ptr);
274         writel(val, &dev->remote->control);
275
276         for (i = dev->irq_start; i <= dev->irq_end; i++) {
277                 virq = i - dev->irq_start;
278                 if (virq == dev->local_irq) {
279                         irq_set_chip_and_handler(i, &vlynq_local_chip,
280                                                  handle_level_irq);
281                         irq_set_chip_data(i, dev);
282                 } else if (virq == dev->remote_irq) {
283                         irq_set_chip_and_handler(i, &vlynq_remote_chip,
284                                                  handle_level_irq);
285                         irq_set_chip_data(i, dev);
286                 } else {
287                         irq_set_chip_and_handler(i, &vlynq_irq_chip,
288                                                  handle_simple_irq);
289                         irq_set_chip_data(i, dev);
290                         writel(0, &dev->remote->int_device[virq >> 2]);
291                 }
292         }
293
294         if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
295                 printk(KERN_ERR "%s: request_irq failed\n",
296                                         dev_name(&dev->dev));
297                 return -EAGAIN;
298         }
299
300         return 0;
301 }
302
303 static void vlynq_device_release(struct device *dev)
304 {
305         struct vlynq_device *vdev = to_vlynq_device(dev);
306         kfree(vdev);
307 }
308
309 static int vlynq_device_match(struct device *dev,
310                               struct device_driver *drv)
311 {
312         struct vlynq_device *vdev = to_vlynq_device(dev);
313         struct vlynq_driver *vdrv = to_vlynq_driver(drv);
314         struct vlynq_device_id *ids = vdrv->id_table;
315
316         while (ids->id) {
317                 if (ids->id == vdev->dev_id) {
318                         vdev->divisor = ids->divisor;
319                         vlynq_set_drvdata(vdev, ids);
320                         printk(KERN_INFO "Driver found for VLYNQ "
321                                 "device: %08x\n", vdev->dev_id);
322                         return 1;
323                 }
324                 printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
325                         " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
326                 ids++;
327         }
328         return 0;
329 }
330
331 static int vlynq_device_probe(struct device *dev)
332 {
333         struct vlynq_device *vdev = to_vlynq_device(dev);
334         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
335         struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
336         int result = -ENODEV;
337
338         if (drv->probe)
339                 result = drv->probe(vdev, id);
340         if (result)
341                 put_device(dev);
342         return result;
343 }
344
345 static void vlynq_device_remove(struct device *dev)
346 {
347         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
348
349         if (drv->remove)
350                 drv->remove(to_vlynq_device(dev));
351 }
352
353 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
354 {
355         driver->driver.name = driver->name;
356         driver->driver.bus = &vlynq_bus_type;
357         return driver_register(&driver->driver);
358 }
359 EXPORT_SYMBOL(__vlynq_register_driver);
360
361 void vlynq_unregister_driver(struct vlynq_driver *driver)
362 {
363         driver_unregister(&driver->driver);
364 }
365 EXPORT_SYMBOL(vlynq_unregister_driver);
366
367 /*
368  * A VLYNQ remote device can clock the VLYNQ bus master
369  * using a dedicated clock line. In that case, both the
370  * remove device and the bus master should have the same
371  * serial clock dividers configured. Iterate through the
372  * 8 possible dividers until we actually link with the
373  * device.
374  */
375 static int __vlynq_try_remote(struct vlynq_device *dev)
376 {
377         int i;
378
379         vlynq_reset(dev);
380         for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
381                         i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
382                 dev->dev_id ? i++ : i--) {
383
384                 if (!vlynq_linked(dev))
385                         break;
386
387                 writel((readl(&dev->remote->control) &
388                                 ~VLYNQ_CTRL_CLOCK_MASK) |
389                                 VLYNQ_CTRL_CLOCK_INT |
390                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
391                                 &dev->remote->control);
392                 writel((readl(&dev->local->control)
393                                 & ~(VLYNQ_CTRL_CLOCK_INT |
394                                 VLYNQ_CTRL_CLOCK_MASK)) |
395                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
396                                 &dev->local->control);
397
398                 if (vlynq_linked(dev)) {
399                         printk(KERN_DEBUG
400                                 "%s: using remote clock divisor %d\n",
401                                 dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
402                         dev->divisor = i;
403                         return 0;
404                 } else {
405                         vlynq_reset(dev);
406                 }
407         }
408
409         return -ENODEV;
410 }
411
412 /*
413  * A VLYNQ remote device can be clocked by the VLYNQ bus
414  * master using a dedicated clock line. In that case, only
415  * the bus master configures the serial clock divider.
416  * Iterate through the 8 possible dividers until we
417  * actually get a link with the device.
418  */
419 static int __vlynq_try_local(struct vlynq_device *dev)
420 {
421         int i;
422
423         vlynq_reset(dev);
424
425         for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
426                         i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
427                 dev->dev_id ? i++ : i--) {
428
429                 writel((readl(&dev->local->control) &
430                                 ~VLYNQ_CTRL_CLOCK_MASK) |
431                                 VLYNQ_CTRL_CLOCK_INT |
432                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
433                                 &dev->local->control);
434
435                 if (vlynq_linked(dev)) {
436                         printk(KERN_DEBUG
437                                 "%s: using local clock divisor %d\n",
438                                 dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
439                         dev->divisor = i;
440                         return 0;
441                 } else {
442                         vlynq_reset(dev);
443                 }
444         }
445
446         return -ENODEV;
447 }
448
449 /*
450  * When using external clocking method, serial clock
451  * is supplied by an external oscillator, therefore we
452  * should mask the local clock bit in the clock control
453  * register for both the bus master and the remote device.
454  */
455 static int __vlynq_try_external(struct vlynq_device *dev)
456 {
457         vlynq_reset(dev);
458         if (!vlynq_linked(dev))
459                 return -ENODEV;
460
461         writel((readl(&dev->remote->control) &
462                         ~VLYNQ_CTRL_CLOCK_INT),
463                         &dev->remote->control);
464
465         writel((readl(&dev->local->control) &
466                         ~VLYNQ_CTRL_CLOCK_INT),
467                         &dev->local->control);
468
469         if (vlynq_linked(dev)) {
470                 printk(KERN_DEBUG "%s: using external clock\n",
471                         dev_name(&dev->dev));
472                         dev->divisor = vlynq_div_external;
473                 return 0;
474         }
475
476         return -ENODEV;
477 }
478
479 static int __vlynq_enable_device(struct vlynq_device *dev)
480 {
481         int result;
482         struct plat_vlynq_ops *ops = dev->dev.platform_data;
483
484         result = ops->on(dev);
485         if (result)
486                 return result;
487
488         switch (dev->divisor) {
489         case vlynq_div_external:
490         case vlynq_div_auto:
491                 /* When the device is brought from reset it should have clock
492                  * generation negotiated by hardware.
493                  * Check which device is generating clocks and perform setup
494                  * accordingly */
495                 if (vlynq_linked(dev) && readl(&dev->remote->control) &
496                    VLYNQ_CTRL_CLOCK_INT) {
497                         if (!__vlynq_try_remote(dev) ||
498                                 !__vlynq_try_local(dev)  ||
499                                 !__vlynq_try_external(dev))
500                                 return 0;
501                 } else {
502                         if (!__vlynq_try_external(dev) ||
503                                 !__vlynq_try_local(dev)    ||
504                                 !__vlynq_try_remote(dev))
505                                 return 0;
506                 }
507                 break;
508         case vlynq_ldiv1:
509         case vlynq_ldiv2:
510         case vlynq_ldiv3:
511         case vlynq_ldiv4:
512         case vlynq_ldiv5:
513         case vlynq_ldiv6:
514         case vlynq_ldiv7:
515         case vlynq_ldiv8:
516                 writel(VLYNQ_CTRL_CLOCK_INT |
517                         VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
518                         vlynq_ldiv1), &dev->local->control);
519                 writel(0, &dev->remote->control);
520                 if (vlynq_linked(dev)) {
521                         printk(KERN_DEBUG
522                                 "%s: using local clock divisor %d\n",
523                                 dev_name(&dev->dev),
524                                 dev->divisor - vlynq_ldiv1 + 1);
525                         return 0;
526                 }
527                 break;
528         case vlynq_rdiv1:
529         case vlynq_rdiv2:
530         case vlynq_rdiv3:
531         case vlynq_rdiv4:
532         case vlynq_rdiv5:
533         case vlynq_rdiv6:
534         case vlynq_rdiv7:
535         case vlynq_rdiv8:
536                 writel(0, &dev->local->control);
537                 writel(VLYNQ_CTRL_CLOCK_INT |
538                         VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
539                         vlynq_rdiv1), &dev->remote->control);
540                 if (vlynq_linked(dev)) {
541                         printk(KERN_DEBUG
542                                 "%s: using remote clock divisor %d\n",
543                                 dev_name(&dev->dev),
544                                 dev->divisor - vlynq_rdiv1 + 1);
545                         return 0;
546                 }
547                 break;
548         }
549
550         ops->off(dev);
551         return -ENODEV;
552 }
553
554 int vlynq_enable_device(struct vlynq_device *dev)
555 {
556         struct plat_vlynq_ops *ops = dev->dev.platform_data;
557         int result = -ENODEV;
558
559         result = __vlynq_enable_device(dev);
560         if (result)
561                 return result;
562
563         result = vlynq_setup_irq(dev);
564         if (result)
565                 ops->off(dev);
566
567         dev->enabled = !result;
568         return result;
569 }
570 EXPORT_SYMBOL(vlynq_enable_device);
571
572
573 void vlynq_disable_device(struct vlynq_device *dev)
574 {
575         struct plat_vlynq_ops *ops = dev->dev.platform_data;
576
577         dev->enabled = 0;
578         free_irq(dev->irq, dev);
579         ops->off(dev);
580 }
581 EXPORT_SYMBOL(vlynq_disable_device);
582
583 int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
584                             struct vlynq_mapping *mapping)
585 {
586         int i;
587
588         if (!dev->enabled)
589                 return -ENXIO;
590
591         writel(tx_offset, &dev->local->tx_offset);
592         for (i = 0; i < 4; i++) {
593                 writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
594                 writel(mapping[i].size, &dev->local->rx_mapping[i].size);
595         }
596         return 0;
597 }
598 EXPORT_SYMBOL(vlynq_set_local_mapping);
599
600 int vlynq_set_remote_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->remote->tx_offset);
609         for (i = 0; i < 4; i++) {
610                 writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
611                 writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
612         }
613         return 0;
614 }
615 EXPORT_SYMBOL(vlynq_set_remote_mapping);
616
617 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
618 {
619         int irq = dev->irq_start + virq;
620         if (dev->enabled)
621                 return -EBUSY;
622
623         if ((irq < dev->irq_start) || (irq > dev->irq_end))
624                 return -EINVAL;
625
626         if (virq == dev->remote_irq)
627                 return -EINVAL;
628
629         dev->local_irq = virq;
630
631         return 0;
632 }
633 EXPORT_SYMBOL(vlynq_set_local_irq);
634
635 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
636 {
637         int irq = dev->irq_start + virq;
638         if (dev->enabled)
639                 return -EBUSY;
640
641         if ((irq < dev->irq_start) || (irq > dev->irq_end))
642                 return -EINVAL;
643
644         if (virq == dev->local_irq)
645                 return -EINVAL;
646
647         dev->remote_irq = virq;
648
649         return 0;
650 }
651 EXPORT_SYMBOL(vlynq_set_remote_irq);
652
653 static int vlynq_probe(struct platform_device *pdev)
654 {
655         struct vlynq_device *dev;
656         struct resource *regs_res, *mem_res, *irq_res;
657         int len, result;
658
659         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
660         if (!regs_res)
661                 return -ENODEV;
662
663         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
664         if (!mem_res)
665                 return -ENODEV;
666
667         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
668         if (!irq_res)
669                 return -ENODEV;
670
671         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
672         if (!dev) {
673                 printk(KERN_ERR
674                        "vlynq: failed to allocate device structure\n");
675                 return -ENOMEM;
676         }
677
678         dev->id = pdev->id;
679         dev->dev.bus = &vlynq_bus_type;
680         dev->dev.parent = &pdev->dev;
681         dev_set_name(&dev->dev, "vlynq%d", dev->id);
682         dev->dev.platform_data = pdev->dev.platform_data;
683         dev->dev.release = vlynq_device_release;
684
685         dev->regs_start = regs_res->start;
686         dev->regs_end = regs_res->end;
687         dev->mem_start = mem_res->start;
688         dev->mem_end = mem_res->end;
689
690         len = resource_size(regs_res);
691         if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
692                 printk(KERN_ERR "%s: Can't request vlynq registers\n",
693                        dev_name(&dev->dev));
694                 result = -ENXIO;
695                 goto fail_request;
696         }
697
698         dev->local = ioremap(regs_res->start, len);
699         if (!dev->local) {
700                 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
701                        dev_name(&dev->dev));
702                 result = -ENXIO;
703                 goto fail_remap;
704         }
705
706         dev->remote = (struct vlynq_regs *)((void *)dev->local +
707                                             VLYNQ_REMOTE_OFFSET);
708
709         dev->irq = platform_get_irq_byname(pdev, "irq");
710         dev->irq_start = irq_res->start;
711         dev->irq_end = irq_res->end;
712         dev->local_irq = dev->irq_end - dev->irq_start;
713         dev->remote_irq = dev->local_irq - 1;
714
715         if (device_register(&dev->dev))
716                 goto fail_register;
717         platform_set_drvdata(pdev, dev);
718
719         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
720                dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
721                (void *)dev->mem_start);
722
723         dev->dev_id = 0;
724         dev->divisor = vlynq_div_auto;
725         result = __vlynq_enable_device(dev);
726         if (result == 0) {
727                 dev->dev_id = readl(&dev->remote->chip);
728                 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
729         }
730         if (dev->dev_id)
731                 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
732
733         return 0;
734
735 fail_register:
736         iounmap(dev->local);
737 fail_remap:
738 fail_request:
739         release_mem_region(regs_res->start, len);
740         kfree(dev);
741         return result;
742 }
743
744 static int vlynq_remove(struct platform_device *pdev)
745 {
746         struct vlynq_device *dev = platform_get_drvdata(pdev);
747
748         device_unregister(&dev->dev);
749         iounmap(dev->local);
750         release_mem_region(dev->regs_start,
751                            dev->regs_end - dev->regs_start + 1);
752
753         kfree(dev);
754
755         return 0;
756 }
757
758 static struct platform_driver vlynq_platform_driver = {
759         .driver.name = "vlynq",
760         .probe = vlynq_probe,
761         .remove = vlynq_remove,
762 };
763
764 struct bus_type vlynq_bus_type = {
765         .name = "vlynq",
766         .match = vlynq_device_match,
767         .probe = vlynq_device_probe,
768         .remove = vlynq_device_remove,
769 };
770 EXPORT_SYMBOL(vlynq_bus_type);
771
772 static int vlynq_init(void)
773 {
774         int res = 0;
775
776         res = bus_register(&vlynq_bus_type);
777         if (res)
778                 goto fail_bus;
779
780         res = platform_driver_register(&vlynq_platform_driver);
781         if (res)
782                 goto fail_platform;
783
784         return 0;
785
786 fail_platform:
787         bus_unregister(&vlynq_bus_type);
788 fail_bus:
789         return res;
790 }
791
792 static void vlynq_exit(void)
793 {
794         platform_driver_unregister(&vlynq_platform_driver);
795         bus_unregister(&vlynq_bus_type);
796 }
797
798 module_init(vlynq_init);
799 module_exit(vlynq_exit);