drivers: add support for the TI VLYNQ bus
[linux-2.6.git] / drivers / vlynq / vlynq.c
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/device.h>
32 #include <linux/delay.h>
33 #include <linux/io.h>
34
35 #include <linux/vlynq.h>
36
37 #define VLYNQ_CTRL_PM_ENABLE            0x80000000
38 #define VLYNQ_CTRL_CLOCK_INT            0x00008000
39 #define VLYNQ_CTRL_CLOCK_DIV(x)         (((x) & 7) << 16)
40 #define VLYNQ_CTRL_INT_LOCAL            0x00004000
41 #define VLYNQ_CTRL_INT_ENABLE           0x00002000
42 #define VLYNQ_CTRL_INT_VECTOR(x)        (((x) & 0x1f) << 8)
43 #define VLYNQ_CTRL_INT2CFG              0x00000080
44 #define VLYNQ_CTRL_RESET                0x00000001
45
46 #define VLYNQ_CTRL_CLOCK_MASK          (0x7 << 16)
47
48 #define VLYNQ_INT_OFFSET                0x00000014
49 #define VLYNQ_REMOTE_OFFSET             0x00000080
50
51 #define VLYNQ_STATUS_LINK               0x00000001
52 #define VLYNQ_STATUS_LERROR             0x00000080
53 #define VLYNQ_STATUS_RERROR             0x00000100
54
55 #define VINT_ENABLE                     0x00000100
56 #define VINT_TYPE_EDGE                  0x00000080
57 #define VINT_LEVEL_LOW                  0x00000040
58 #define VINT_VECTOR(x)                  ((x) & 0x1f)
59 #define VINT_OFFSET(irq)                (8 * ((irq) % 4))
60
61 #define VLYNQ_AUTONEGO_V2               0x00010000
62
63 struct vlynq_regs {
64         u32 revision;
65         u32 control;
66         u32 status;
67         u32 int_prio;
68         u32 int_status;
69         u32 int_pending;
70         u32 int_ptr;
71         u32 tx_offset;
72         struct vlynq_mapping rx_mapping[4];
73         u32 chip;
74         u32 autonego;
75         u32 unused[6];
76         u32 int_device[8];
77 };
78
79 #ifdef VLYNQ_DEBUG
80 static void vlynq_dump_regs(struct vlynq_device *dev)
81 {
82         int i;
83
84         printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
85                         dev->local, dev->remote);
86         for (i = 0; i < 32; i++) {
87                 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
88                         i + 1, ((u32 *)dev->local)[i]);
89                 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
90                         i + 1, ((u32 *)dev->remote)[i]);
91         }
92 }
93
94 static void vlynq_dump_mem(u32 *base, int count)
95 {
96         int i;
97
98         for (i = 0; i < (count + 3) / 4; i++) {
99                 if (i % 4 == 0)
100                         printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
101                 printk(KERN_DEBUG " 0x%08x", *(base + i));
102         }
103         printk(KERN_DEBUG "\n");
104 }
105 #endif
106
107 /* Check the VLYNQ link status with a given device */
108 static int vlynq_linked(struct vlynq_device *dev)
109 {
110         int i;
111
112         for (i = 0; i < 100; i++)
113                 if (readl(&dev->local->status) & VLYNQ_STATUS_LINK)
114                         return 1;
115                 else
116                         cpu_relax();
117
118         return 0;
119 }
120
121 static void vlynq_reset(struct vlynq_device *dev)
122 {
123         writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
124                         &dev->local->control);
125
126         /* Wait for the devices to finish resetting */
127         msleep(5);
128
129         /* Remove reset bit */
130         writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
131                         &dev->local->control);
132
133         /* Give some time for the devices to settle */
134         msleep(5);
135 }
136
137 static void vlynq_irq_unmask(unsigned int irq)
138 {
139         u32 val;
140         struct vlynq_device *dev = get_irq_chip_data(irq);
141         int virq;
142
143         BUG_ON(!dev);
144         virq = irq - dev->irq_start;
145         val = readl(&dev->remote->int_device[virq >> 2]);
146         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
147         writel(val, &dev->remote->int_device[virq >> 2]);
148 }
149
150 static void vlynq_irq_mask(unsigned int irq)
151 {
152         u32 val;
153         struct vlynq_device *dev = get_irq_chip_data(irq);
154         int virq;
155
156         BUG_ON(!dev);
157         virq = irq - dev->irq_start;
158         val = readl(&dev->remote->int_device[virq >> 2]);
159         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
160         writel(val, &dev->remote->int_device[virq >> 2]);
161 }
162
163 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
164 {
165         u32 val;
166         struct vlynq_device *dev = get_irq_chip_data(irq);
167         int virq;
168
169         BUG_ON(!dev);
170         virq = irq - dev->irq_start;
171         val = readl(&dev->remote->int_device[virq >> 2]);
172         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
173         case IRQ_TYPE_EDGE_RISING:
174         case IRQ_TYPE_EDGE_FALLING:
175         case IRQ_TYPE_EDGE_BOTH:
176                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
177                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
178                 break;
179         case IRQ_TYPE_LEVEL_HIGH:
180                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
181                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
182                 break;
183         case IRQ_TYPE_LEVEL_LOW:
184                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
185                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
186                 break;
187         default:
188                 return -EINVAL;
189         }
190         writel(val, &dev->remote->int_device[virq >> 2]);
191         return 0;
192 }
193
194 static void vlynq_local_ack(unsigned int irq)
195 {
196         struct vlynq_device *dev = get_irq_chip_data(irq);
197
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
205 static void vlynq_remote_ack(unsigned int irq)
206 {
207         struct vlynq_device *dev = get_irq_chip_data(irq);
208
209         u32 status = readl(&dev->remote->status);
210
211         pr_debug("%s: remote status: 0x%08x\n",
212                        dev_name(&dev->dev), status);
213         writel(status, &dev->remote->status);
214 }
215
216 static irqreturn_t vlynq_irq(int irq, void *dev_id)
217 {
218         struct vlynq_device *dev = dev_id;
219         u32 status;
220         int virq = 0;
221
222         status = readl(&dev->local->int_status);
223         writel(status, &dev->local->int_status);
224
225         if (unlikely(!status))
226                 spurious_interrupt();
227
228         while (status) {
229                 if (status & 1)
230                         do_IRQ(dev->irq_start + virq);
231                 status >>= 1;
232                 virq++;
233         }
234
235         return IRQ_HANDLED;
236 }
237
238 static struct irq_chip vlynq_irq_chip = {
239         .name = "vlynq",
240         .unmask = vlynq_irq_unmask,
241         .mask = vlynq_irq_mask,
242         .set_type = vlynq_irq_type,
243 };
244
245 static struct irq_chip vlynq_local_chip = {
246         .name = "vlynq local error",
247         .unmask = vlynq_irq_unmask,
248         .mask = vlynq_irq_mask,
249         .ack = vlynq_local_ack,
250 };
251
252 static struct irq_chip vlynq_remote_chip = {
253         .name = "vlynq local error",
254         .unmask = vlynq_irq_unmask,
255         .mask = vlynq_irq_mask,
256         .ack = vlynq_remote_ack,
257 };
258
259 static int vlynq_setup_irq(struct vlynq_device *dev)
260 {
261         u32 val;
262         int i, virq;
263
264         if (dev->local_irq == dev->remote_irq) {
265                 printk(KERN_ERR
266                        "%s: local vlynq irq should be different from remote\n",
267                        dev_name(&dev->dev));
268                 return -EINVAL;
269         }
270
271         /* Clear local and remote error bits */
272         writel(readl(&dev->local->status), &dev->local->status);
273         writel(readl(&dev->remote->status), &dev->remote->status);
274
275         /* Now setup interrupts */
276         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
277         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
278                 VLYNQ_CTRL_INT2CFG;
279         val |= readl(&dev->local->control);
280         writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
281         writel(val, &dev->local->control);
282
283         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
284         val |= VLYNQ_CTRL_INT_ENABLE;
285         val |= readl(&dev->remote->control);
286         writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
287         writel(val, &dev->remote->int_ptr);
288         writel(val, &dev->remote->control);
289
290         for (i = dev->irq_start; i <= dev->irq_end; i++) {
291                 virq = i - dev->irq_start;
292                 if (virq == dev->local_irq) {
293                         set_irq_chip_and_handler(i, &vlynq_local_chip,
294                                                  handle_level_irq);
295                         set_irq_chip_data(i, dev);
296                 } else if (virq == dev->remote_irq) {
297                         set_irq_chip_and_handler(i, &vlynq_remote_chip,
298                                                  handle_level_irq);
299                         set_irq_chip_data(i, dev);
300                 } else {
301                         set_irq_chip_and_handler(i, &vlynq_irq_chip,
302                                                  handle_simple_irq);
303                         set_irq_chip_data(i, dev);
304                         writel(0, &dev->remote->int_device[virq >> 2]);
305                 }
306         }
307
308         if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
309                 printk(KERN_ERR "%s: request_irq failed\n",
310                                         dev_name(&dev->dev));
311                 return -EAGAIN;
312         }
313
314         return 0;
315 }
316
317 static void vlynq_device_release(struct device *dev)
318 {
319         struct vlynq_device *vdev = to_vlynq_device(dev);
320         kfree(vdev);
321 }
322
323 static int vlynq_device_match(struct device *dev,
324                               struct device_driver *drv)
325 {
326         struct vlynq_device *vdev = to_vlynq_device(dev);
327         struct vlynq_driver *vdrv = to_vlynq_driver(drv);
328         struct vlynq_device_id *ids = vdrv->id_table;
329
330         while (ids->id) {
331                 if (ids->id == vdev->dev_id) {
332                         vdev->divisor = ids->divisor;
333                         vlynq_set_drvdata(vdev, ids);
334                         printk(KERN_INFO "Driver found for VLYNQ "
335                                 "device: %08x\n", vdev->dev_id);
336                         return 1;
337                 }
338                 printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
339                         " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
340                 ids++;
341         }
342         return 0;
343 }
344
345 static int vlynq_device_probe(struct device *dev)
346 {
347         struct vlynq_device *vdev = to_vlynq_device(dev);
348         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
349         struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
350         int result = -ENODEV;
351
352         if (drv->probe)
353                 result = drv->probe(vdev, id);
354         if (result)
355                 put_device(dev);
356         return result;
357 }
358
359 static int vlynq_device_remove(struct device *dev)
360 {
361         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
362
363         if (drv->remove)
364                 drv->remove(to_vlynq_device(dev));
365
366         return 0;
367 }
368
369 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
370 {
371         driver->driver.name = driver->name;
372         driver->driver.bus = &vlynq_bus_type;
373         return driver_register(&driver->driver);
374 }
375 EXPORT_SYMBOL(__vlynq_register_driver);
376
377 void vlynq_unregister_driver(struct vlynq_driver *driver)
378 {
379         driver_unregister(&driver->driver);
380 }
381 EXPORT_SYMBOL(vlynq_unregister_driver);
382
383 /*
384  * A VLYNQ remote device can clock the VLYNQ bus master
385  * using a dedicated clock line. In that case, both the
386  * remove device and the bus master should have the same
387  * serial clock dividers configured. Iterate through the
388  * 8 possible dividers until we actually link with the
389  * device.
390  */
391 static int __vlynq_try_remote(struct vlynq_device *dev)
392 {
393         int i;
394
395         vlynq_reset(dev);
396         for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
397                         i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
398                 dev->dev_id ? i++ : i--) {
399
400                 if (!vlynq_linked(dev))
401                         break;
402
403                 writel((readl(&dev->remote->control) &
404                                 ~VLYNQ_CTRL_CLOCK_MASK) |
405                                 VLYNQ_CTRL_CLOCK_INT |
406                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
407                                 &dev->remote->control);
408                 writel((readl(&dev->local->control)
409                                 & ~(VLYNQ_CTRL_CLOCK_INT |
410                                 VLYNQ_CTRL_CLOCK_MASK)) |
411                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
412                                 &dev->local->control);
413
414                 if (vlynq_linked(dev)) {
415                         printk(KERN_DEBUG
416                                 "%s: using remote clock divisor %d\n",
417                                 dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
418                         dev->divisor = i;
419                         return 0;
420                 } else {
421                         vlynq_reset(dev);
422                 }
423         }
424
425         return -ENODEV;
426 }
427
428 /*
429  * A VLYNQ remote device can be clocked by the VLYNQ bus
430  * master using a dedicated clock line. In that case, only
431  * the bus master configures the serial clock divider.
432  * Iterate through the 8 possible dividers until we
433  * actually get a link with the device.
434  */
435 static int __vlynq_try_local(struct vlynq_device *dev)
436 {
437         int i;
438
439         vlynq_reset(dev);
440
441         for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
442                         i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
443                 dev->dev_id ? i++ : i--) {
444
445                 writel((readl(&dev->local->control) &
446                                 ~VLYNQ_CTRL_CLOCK_MASK) |
447                                 VLYNQ_CTRL_CLOCK_INT |
448                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
449                                 &dev->local->control);
450
451                 if (vlynq_linked(dev)) {
452                         printk(KERN_DEBUG
453                                 "%s: using local clock divisor %d\n",
454                                 dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
455                         dev->divisor = i;
456                         return 0;
457                 } else {
458                         vlynq_reset(dev);
459                 }
460         }
461
462         return -ENODEV;
463 }
464
465 /*
466  * When using external clocking method, serial clock
467  * is supplied by an external oscillator, therefore we
468  * should mask the local clock bit in the clock control
469  * register for both the bus master and the remote device.
470  */
471 static int __vlynq_try_external(struct vlynq_device *dev)
472 {
473         vlynq_reset(dev);
474         if (!vlynq_linked(dev))
475                 return -ENODEV;
476
477         writel((readl(&dev->remote->control) &
478                         ~VLYNQ_CTRL_CLOCK_INT),
479                         &dev->remote->control);
480
481         writel((readl(&dev->local->control) &
482                         ~VLYNQ_CTRL_CLOCK_INT),
483                         &dev->local->control);
484
485         if (vlynq_linked(dev)) {
486                 printk(KERN_DEBUG "%s: using external clock\n",
487                         dev_name(&dev->dev));
488                         dev->divisor = vlynq_div_external;
489                 return 0;
490         }
491
492         return -ENODEV;
493 }
494
495 static int __vlynq_enable_device(struct vlynq_device *dev)
496 {
497         int result;
498         struct plat_vlynq_ops *ops = dev->dev.platform_data;
499
500         result = ops->on(dev);
501         if (result)
502                 return result;
503
504         switch (dev->divisor) {
505         case vlynq_div_external:
506         case vlynq_div_auto:
507                 /* When the device is brought from reset it should have clock
508                  * generation negotiated by hardware.
509                  * Check which device is generating clocks and perform setup
510                  * accordingly */
511                 if (vlynq_linked(dev) && readl(&dev->remote->control) &
512                    VLYNQ_CTRL_CLOCK_INT) {
513                         if (!__vlynq_try_remote(dev) ||
514                                 !__vlynq_try_local(dev)  ||
515                                 !__vlynq_try_external(dev))
516                                 return 0;
517                 } else {
518                         if (!__vlynq_try_external(dev) ||
519                                 !__vlynq_try_local(dev)    ||
520                                 !__vlynq_try_remote(dev))
521                                 return 0;
522                 }
523                 break;
524         case vlynq_ldiv1:
525         case vlynq_ldiv2:
526         case vlynq_ldiv3:
527         case vlynq_ldiv4:
528         case vlynq_ldiv5:
529         case vlynq_ldiv6:
530         case vlynq_ldiv7:
531         case vlynq_ldiv8:
532                 writel(VLYNQ_CTRL_CLOCK_INT |
533                         VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
534                         vlynq_ldiv1), &dev->local->control);
535                 writel(0, &dev->remote->control);
536                 if (vlynq_linked(dev)) {
537                         printk(KERN_DEBUG
538                                 "%s: using local clock divisor %d\n",
539                                 dev_name(&dev->dev),
540                                 dev->divisor - vlynq_ldiv1 + 1);
541                         return 0;
542                 }
543                 break;
544         case vlynq_rdiv1:
545         case vlynq_rdiv2:
546         case vlynq_rdiv3:
547         case vlynq_rdiv4:
548         case vlynq_rdiv5:
549         case vlynq_rdiv6:
550         case vlynq_rdiv7:
551         case vlynq_rdiv8:
552                 writel(0, &dev->local->control);
553                 writel(VLYNQ_CTRL_CLOCK_INT |
554                         VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
555                         vlynq_rdiv1), &dev->remote->control);
556                 if (vlynq_linked(dev)) {
557                         printk(KERN_DEBUG
558                                 "%s: using remote clock divisor %d\n",
559                                 dev_name(&dev->dev),
560                                 dev->divisor - vlynq_rdiv1 + 1);
561                         return 0;
562                 }
563                 break;
564         }
565
566         ops->off(dev);
567         return -ENODEV;
568 }
569
570 int vlynq_enable_device(struct vlynq_device *dev)
571 {
572         struct plat_vlynq_ops *ops = dev->dev.platform_data;
573         int result = -ENODEV;
574
575         result = __vlynq_enable_device(dev);
576         if (result)
577                 return result;
578
579         result = vlynq_setup_irq(dev);
580         if (result)
581                 ops->off(dev);
582
583         dev->enabled = !result;
584         return result;
585 }
586 EXPORT_SYMBOL(vlynq_enable_device);
587
588
589 void vlynq_disable_device(struct vlynq_device *dev)
590 {
591         struct plat_vlynq_ops *ops = dev->dev.platform_data;
592
593         dev->enabled = 0;
594         free_irq(dev->irq, dev);
595         ops->off(dev);
596 }
597 EXPORT_SYMBOL(vlynq_disable_device);
598
599 int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
600                             struct vlynq_mapping *mapping)
601 {
602         int i;
603
604         if (!dev->enabled)
605                 return -ENXIO;
606
607         writel(tx_offset, &dev->local->tx_offset);
608         for (i = 0; i < 4; i++) {
609                 writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
610                 writel(mapping[i].size, &dev->local->rx_mapping[i].size);
611         }
612         return 0;
613 }
614 EXPORT_SYMBOL(vlynq_set_local_mapping);
615
616 int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
617                              struct vlynq_mapping *mapping)
618 {
619         int i;
620
621         if (!dev->enabled)
622                 return -ENXIO;
623
624         writel(tx_offset, &dev->remote->tx_offset);
625         for (i = 0; i < 4; i++) {
626                 writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
627                 writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
628         }
629         return 0;
630 }
631 EXPORT_SYMBOL(vlynq_set_remote_mapping);
632
633 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
634 {
635         int irq = dev->irq_start + virq;
636         if (dev->enabled)
637                 return -EBUSY;
638
639         if ((irq < dev->irq_start) || (irq > dev->irq_end))
640                 return -EINVAL;
641
642         if (virq == dev->remote_irq)
643                 return -EINVAL;
644
645         dev->local_irq = virq;
646
647         return 0;
648 }
649 EXPORT_SYMBOL(vlynq_set_local_irq);
650
651 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
652 {
653         int irq = dev->irq_start + virq;
654         if (dev->enabled)
655                 return -EBUSY;
656
657         if ((irq < dev->irq_start) || (irq > dev->irq_end))
658                 return -EINVAL;
659
660         if (virq == dev->local_irq)
661                 return -EINVAL;
662
663         dev->remote_irq = virq;
664
665         return 0;
666 }
667 EXPORT_SYMBOL(vlynq_set_remote_irq);
668
669 static int vlynq_probe(struct platform_device *pdev)
670 {
671         struct vlynq_device *dev;
672         struct resource *regs_res, *mem_res, *irq_res;
673         int len, result;
674
675         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
676         if (!regs_res)
677                 return -ENODEV;
678
679         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
680         if (!mem_res)
681                 return -ENODEV;
682
683         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
684         if (!irq_res)
685                 return -ENODEV;
686
687         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
688         if (!dev) {
689                 printk(KERN_ERR
690                        "vlynq: failed to allocate device structure\n");
691                 return -ENOMEM;
692         }
693
694         dev->id = pdev->id;
695         dev->dev.bus = &vlynq_bus_type;
696         dev->dev.parent = &pdev->dev;
697         dev_set_name(&dev->dev, "vlynq%d", dev->id);
698         dev->dev.platform_data = pdev->dev.platform_data;
699         dev->dev.release = vlynq_device_release;
700
701         dev->regs_start = regs_res->start;
702         dev->regs_end = regs_res->end;
703         dev->mem_start = mem_res->start;
704         dev->mem_end = mem_res->end;
705
706         len = regs_res->end - regs_res->start;
707         if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
708                 printk(KERN_ERR "%s: Can't request vlynq registers\n",
709                        dev_name(&dev->dev));
710                 result = -ENXIO;
711                 goto fail_request;
712         }
713
714         dev->local = ioremap(regs_res->start, len);
715         if (!dev->local) {
716                 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
717                        dev_name(&dev->dev));
718                 result = -ENXIO;
719                 goto fail_remap;
720         }
721
722         dev->remote = (struct vlynq_regs *)((void *)dev->local +
723                                             VLYNQ_REMOTE_OFFSET);
724
725         dev->irq = platform_get_irq_byname(pdev, "irq");
726         dev->irq_start = irq_res->start;
727         dev->irq_end = irq_res->end;
728         dev->local_irq = dev->irq_end - dev->irq_start;
729         dev->remote_irq = dev->local_irq - 1;
730
731         if (device_register(&dev->dev))
732                 goto fail_register;
733         platform_set_drvdata(pdev, dev);
734
735         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
736                dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
737                (void *)dev->mem_start);
738
739         dev->dev_id = 0;
740         dev->divisor = vlynq_div_auto;
741         result = __vlynq_enable_device(dev);
742         if (result == 0) {
743                 dev->dev_id = readl(&dev->remote->chip);
744                 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
745         }
746         if (dev->dev_id)
747                 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
748
749         return 0;
750
751 fail_register:
752         iounmap(dev->local);
753 fail_remap:
754 fail_request:
755         release_mem_region(regs_res->start, len);
756         kfree(dev);
757         return result;
758 }
759
760 static int vlynq_remove(struct platform_device *pdev)
761 {
762         struct vlynq_device *dev = platform_get_drvdata(pdev);
763
764         device_unregister(&dev->dev);
765         iounmap(dev->local);
766         release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
767
768         kfree(dev);
769
770         return 0;
771 }
772
773 static struct platform_driver vlynq_platform_driver = {
774         .driver.name = "vlynq",
775         .probe = vlynq_probe,
776         .remove = __devexit_p(vlynq_remove),
777 };
778
779 struct bus_type vlynq_bus_type = {
780         .name = "vlynq",
781         .match = vlynq_device_match,
782         .probe = vlynq_device_probe,
783         .remove = vlynq_device_remove,
784 };
785 EXPORT_SYMBOL(vlynq_bus_type);
786
787 static int __devinit 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
801 fail_platform:
802         bus_unregister(&vlynq_bus_type);
803 fail_bus:
804         return res;
805 }
806
807 static void __devexit vlynq_exit(void)
808 {
809         platform_driver_unregister(&vlynq_platform_driver);
810         bus_unregister(&vlynq_bus_type);
811 }
812
813 module_init(vlynq_init);
814 module_exit(vlynq_exit);