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
vlynq_dump_regs(struct vlynq_device * dev)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
vlynq_dump_mem(u32 * base,int count)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 */
vlynq_linked(struct vlynq_device * dev)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
vlynq_reset(struct vlynq_device * dev)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
vlynq_irq_unmask(struct irq_data * d)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
vlynq_irq_mask(struct irq_data * d)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
vlynq_irq_type(struct irq_data * d,unsigned int flow_type)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
vlynq_local_ack(struct irq_data * d)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
vlynq_remote_ack(struct irq_data * d)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
vlynq_irq(int irq,void * dev_id)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
vlynq_setup_irq(struct vlynq_device * dev)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
vlynq_device_release(struct device * dev)303 static void vlynq_device_release(struct device *dev)
304 {
305 struct vlynq_device *vdev = to_vlynq_device(dev);
306 kfree(vdev);
307 }
308
vlynq_device_match(struct device * dev,struct device_driver * drv)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
vlynq_device_probe(struct device * dev)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
vlynq_device_remove(struct device * dev)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
__vlynq_register_driver(struct vlynq_driver * driver,struct module * owner)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
vlynq_unregister_driver(struct vlynq_driver * driver)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 */
__vlynq_try_remote(struct vlynq_device * dev)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 */
__vlynq_try_local(struct vlynq_device * dev)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 */
__vlynq_try_external(struct vlynq_device * dev)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
__vlynq_enable_device(struct vlynq_device * dev)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
vlynq_enable_device(struct vlynq_device * dev)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
vlynq_disable_device(struct vlynq_device * dev)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
vlynq_set_local_mapping(struct vlynq_device * dev,u32 tx_offset,struct vlynq_mapping * mapping)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
vlynq_set_remote_mapping(struct vlynq_device * dev,u32 tx_offset,struct vlynq_mapping * mapping)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
vlynq_set_local_irq(struct vlynq_device * dev,int virq)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
vlynq_set_remote_irq(struct vlynq_device * dev,int virq)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
vlynq_probe(struct platform_device * pdev)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
vlynq_remove(struct platform_device * pdev)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
vlynq_init(void)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
vlynq_exit(void)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);
800