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[linux-2.6-block.git] / drivers / vlynq / vlynq.c
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fd534e9b 1// SPDX-License-Identifier: GPL-2.0-or-later
55e331cf
FF		 2/*
3 * Copyright (C) 2006, 2007 Eugene Konev <ejka@openwrt.org>
4 *
55e331cf
FF		 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>
55e331cf
FF		 18#include <linux/delay.h>
19#include <linux/io.h>
5a0e3ad6 20#include <linux/slab.h>
ca4d3e67 21#include <linux/irq.h>
55e331cf
FF		 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
51struct 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
9e2db5c9 67#ifdef CONFIG_VLYNQ_DEBUG
55e331cf
FF		 68static 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
82static 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 */
96static 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
109static 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
8ec4ad2b 125static void vlynq_irq_unmask(struct irq_data *d)
55e331cf 126{
8ec4ad2b 127 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
55e331cf 128 int virq;
8ec4ad2b 129 u32 val;
55e331cf
FF		 130
131 BUG_ON(!dev);
8ec4ad2b 132 virq = d->irq - dev->irq_start;
55e331cf
FF		 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
8ec4ad2b 138static void vlynq_irq_mask(struct irq_data *d)
55e331cf 139{
8ec4ad2b 140 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
55e331cf 141 int virq;
8ec4ad2b 142 u32 val;
55e331cf
FF		 143
144 BUG_ON(!dev);
8ec4ad2b 145 virq = d->irq - dev->irq_start;
55e331cf
FF		 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
8ec4ad2b 151static int vlynq_irq_type(struct irq_data *d, unsigned int flow_type)
55e331cf 152{
8ec4ad2b 153 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
55e331cf 154 int virq;
8ec4ad2b 155 u32 val;
55e331cf
FF		 156
157 BUG_ON(!dev);
8ec4ad2b 158 virq = d->irq - dev->irq_start;
55e331cf
FF		 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
8ec4ad2b 182static void vlynq_local_ack(struct irq_data *d)
55e331cf 183{
8ec4ad2b 184 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
55e331cf
FF		 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
8ec4ad2b 192static void vlynq_remote_ack(struct irq_data *d)
55e331cf 193{
8ec4ad2b 194 struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
55e331cf
FF		 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
202static 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
224static struct irq_chip vlynq_irq_chip = {
225 .name = "vlynq",
8ec4ad2b
TG		 226 .irq_unmask = vlynq_irq_unmask,
227 .irq_mask = vlynq_irq_mask,
228 .irq_set_type = vlynq_irq_type,
55e331cf
FF		 229};
230
231static struct irq_chip vlynq_local_chip = {
232 .name = "vlynq local error",
8ec4ad2b
TG		 233 .irq_unmask = vlynq_irq_unmask,
234 .irq_mask = vlynq_irq_mask,
235 .irq_ack = vlynq_local_ack,
55e331cf
FF		 236};
237
238static struct irq_chip vlynq_remote_chip = {
239 .name = "vlynq local error",
8ec4ad2b
TG		 240 .irq_unmask = vlynq_irq_unmask,
241 .irq_mask = vlynq_irq_mask,
242 .irq_ack = vlynq_remote_ack,
55e331cf
FF		 243};
244
245static 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) {
8ec4ad2b 279 irq_set_chip_and_handler(i, &vlynq_local_chip,
55e331cf 280 handle_level_irq);
8ec4ad2b 281 irq_set_chip_data(i, dev);
55e331cf 282 } else if (virq == dev->remote_irq) {
8ec4ad2b 283 irq_set_chip_and_handler(i, &vlynq_remote_chip,
55e331cf 284 handle_level_irq);
8ec4ad2b 285 irq_set_chip_data(i, dev);
55e331cf 286 } else {
8ec4ad2b 287 irq_set_chip_and_handler(i, &vlynq_irq_chip,
55e331cf 288 handle_simple_irq);
8ec4ad2b 289 irq_set_chip_data(i, dev);
55e331cf
FF		 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
303static void vlynq_device_release(struct device *dev)
304{
305 struct vlynq_device *vdev = to_vlynq_device(dev);
306 kfree(vdev);
307}
308
309static 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
331static 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
345static int 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 return 0;
353}
354
355int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
356{
357 driver->driver.name = driver->name;
358 driver->driver.bus = &vlynq_bus_type;
359 return driver_register(&driver->driver);
360}
361EXPORT_SYMBOL(__vlynq_register_driver);
362
363void vlynq_unregister_driver(struct vlynq_driver *driver)
364{
365 driver_unregister(&driver->driver);
366}
367EXPORT_SYMBOL(vlynq_unregister_driver);
368
369/*
370 * A VLYNQ remote device can clock the VLYNQ bus master
371 * using a dedicated clock line. In that case, both the
372 * remove device and the bus master should have the same
373 * serial clock dividers configured. Iterate through the
374 * 8 possible dividers until we actually link with the
375 * device.
376 */
377static int __vlynq_try_remote(struct vlynq_device *dev)
378{
379 int i;
380
381 vlynq_reset(dev);
382 for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
383 i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
384 dev->dev_id ? i++ : i--) {
385
386 if (!vlynq_linked(dev))
387 break;
388
389 writel((readl(&dev->remote->control) &
390 ~VLYNQ_CTRL_CLOCK_MASK) |
391 VLYNQ_CTRL_CLOCK_INT |
392 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
393 &dev->remote->control);
394 writel((readl(&dev->local->control)
395 & ~(VLYNQ_CTRL_CLOCK_INT |
396 VLYNQ_CTRL_CLOCK_MASK)) |
397 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
398 &dev->local->control);
399
400 if (vlynq_linked(dev)) {
401 printk(KERN_DEBUG
402 "%s: using remote clock divisor %d\n",
403 dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
404 dev->divisor = i;
405 return 0;
406 } else {
407 vlynq_reset(dev);
408 }
409 }
410
411 return -ENODEV;
412}
413
414/*
415 * A VLYNQ remote device can be clocked by the VLYNQ bus
416 * master using a dedicated clock line. In that case, only
417 * the bus master configures the serial clock divider.
418 * Iterate through the 8 possible dividers until we
419 * actually get a link with the device.
420 */
421static int __vlynq_try_local(struct vlynq_device *dev)
422{
423 int i;
424
425 vlynq_reset(dev);
426
427 for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
428 i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
429 dev->dev_id ? i++ : i--) {
430
431 writel((readl(&dev->local->control) &
432 ~VLYNQ_CTRL_CLOCK_MASK) |
433 VLYNQ_CTRL_CLOCK_INT |
434 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
435 &dev->local->control);
436
437 if (vlynq_linked(dev)) {
438 printk(KERN_DEBUG
439 "%s: using local clock divisor %d\n",
440 dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
441 dev->divisor = i;
442 return 0;
443 } else {
444 vlynq_reset(dev);
445 }
446 }
447
448 return -ENODEV;
449}
450
451/*
452 * When using external clocking method, serial clock
453 * is supplied by an external oscillator, therefore we
454 * should mask the local clock bit in the clock control
455 * register for both the bus master and the remote device.
456 */
457static int __vlynq_try_external(struct vlynq_device *dev)
458{
459 vlynq_reset(dev);
460 if (!vlynq_linked(dev))
461 return -ENODEV;
462
463 writel((readl(&dev->remote->control) &
464 ~VLYNQ_CTRL_CLOCK_INT),
465 &dev->remote->control);
466
467 writel((readl(&dev->local->control) &
468 ~VLYNQ_CTRL_CLOCK_INT),
469 &dev->local->control);
470
471 if (vlynq_linked(dev)) {
472 printk(KERN_DEBUG "%s: using external clock\n",
473 dev_name(&dev->dev));
474 dev->divisor = vlynq_div_external;
475 return 0;
476 }
477
478 return -ENODEV;
479}
480
481static int __vlynq_enable_device(struct vlynq_device *dev)
482{
483 int result;
484 struct plat_vlynq_ops *ops = dev->dev.platform_data;
485
486 result = ops->on(dev);
487 if (result)
488 return result;
489
490 switch (dev->divisor) {
491 case vlynq_div_external:
492 case vlynq_div_auto:
493 /* When the device is brought from reset it should have clock
494 * generation negotiated by hardware.
495 * Check which device is generating clocks and perform setup
496 * accordingly */
497 if (vlynq_linked(dev) && readl(&dev->remote->control) &
498 VLYNQ_CTRL_CLOCK_INT) {
499 if (!__vlynq_try_remote(dev) ||
500 !__vlynq_try_local(dev) ||
501 !__vlynq_try_external(dev))
502 return 0;
503 } else {
504 if (!__vlynq_try_external(dev) ||
505 !__vlynq_try_local(dev) ||
506 !__vlynq_try_remote(dev))
507 return 0;
508 }
509 break;
510 case vlynq_ldiv1:
511 case vlynq_ldiv2:
512 case vlynq_ldiv3:
513 case vlynq_ldiv4:
514 case vlynq_ldiv5:
515 case vlynq_ldiv6:
516 case vlynq_ldiv7:
517 case vlynq_ldiv8:
518 writel(VLYNQ_CTRL_CLOCK_INT |
519 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
520 vlynq_ldiv1), &dev->local->control);
521 writel(0, &dev->remote->control);
522 if (vlynq_linked(dev)) {
523 printk(KERN_DEBUG
524 "%s: using local clock divisor %d\n",
525 dev_name(&dev->dev),
526 dev->divisor - vlynq_ldiv1 + 1);
527 return 0;
528 }
529 break;
530 case vlynq_rdiv1:
531 case vlynq_rdiv2:
532 case vlynq_rdiv3:
533 case vlynq_rdiv4:
534 case vlynq_rdiv5:
535 case vlynq_rdiv6:
536 case vlynq_rdiv7:
537 case vlynq_rdiv8:
538 writel(0, &dev->local->control);
539 writel(VLYNQ_CTRL_CLOCK_INT |
540 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
541 vlynq_rdiv1), &dev->remote->control);
542 if (vlynq_linked(dev)) {
543 printk(KERN_DEBUG
544 "%s: using remote clock divisor %d\n",
545 dev_name(&dev->dev),
546 dev->divisor - vlynq_rdiv1 + 1);
547 return 0;
548 }
549 break;
550 }
551
552 ops->off(dev);
553 return -ENODEV;
554}
555
556int vlynq_enable_device(struct vlynq_device *dev)
557{
558 struct plat_vlynq_ops *ops = dev->dev.platform_data;
559 int result = -ENODEV;
560
561 result = __vlynq_enable_device(dev);
562 if (result)
563 return result;
564
565 result = vlynq_setup_irq(dev);
566 if (result)
567 ops->off(dev);
568
569 dev->enabled = !result;
570 return result;
571}
572EXPORT_SYMBOL(vlynq_enable_device);
573
574
575void vlynq_disable_device(struct vlynq_device *dev)
576{
577 struct plat_vlynq_ops *ops = dev->dev.platform_data;
578
579 dev->enabled = 0;
580 free_irq(dev->irq, dev);
581 ops->off(dev);
582}
583EXPORT_SYMBOL(vlynq_disable_device);
584
585int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
586 struct vlynq_mapping *mapping)
587{
588 int i;
589
590 if (!dev->enabled)
591 return -ENXIO;
592
593 writel(tx_offset, &dev->local->tx_offset);
594 for (i = 0; i < 4; i++) {
595 writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
596 writel(mapping[i].size, &dev->local->rx_mapping[i].size);
597 }
598 return 0;
599}
600EXPORT_SYMBOL(vlynq_set_local_mapping);
601
602int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
603 struct vlynq_mapping *mapping)
604{
605 int i;
606
607 if (!dev->enabled)
608 return -ENXIO;
609
610 writel(tx_offset, &dev->remote->tx_offset);
611 for (i = 0; i < 4; i++) {
612 writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
613 writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
614 }
615 return 0;
616}
617EXPORT_SYMBOL(vlynq_set_remote_mapping);
618
619int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
620{
621 int irq = dev->irq_start + virq;
622 if (dev->enabled)
623 return -EBUSY;
624
625 if ((irq < dev->irq_start) || (irq > dev->irq_end))
626 return -EINVAL;
627
628 if (virq == dev->remote_irq)
629 return -EINVAL;
630
631 dev->local_irq = virq;
632
633 return 0;
634}
635EXPORT_SYMBOL(vlynq_set_local_irq);
636
637int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
638{
639 int irq = dev->irq_start + virq;
640 if (dev->enabled)
641 return -EBUSY;
642
643 if ((irq < dev->irq_start) || (irq > dev->irq_end))
644 return -EINVAL;
645
646 if (virq == dev->local_irq)
647 return -EINVAL;
648
649 dev->remote_irq = virq;
650
651 return 0;
652}
653EXPORT_SYMBOL(vlynq_set_remote_irq);
654
655static int vlynq_probe(struct platform_device *pdev)
656{
657 struct vlynq_device *dev;
658 struct resource *regs_res, *mem_res, *irq_res;
659 int len, result;
660
661 regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
662 if (!regs_res)
663 return -ENODEV;
664
665 mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
666 if (!mem_res)
667 return -ENODEV;
668
669 irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
670 if (!irq_res)
671 return -ENODEV;
672
673 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
674 if (!dev) {
675 printk(KERN_ERR
676 "vlynq: failed to allocate device structure\n");
677 return -ENOMEM;
678 }
679
680 dev->id = pdev->id;
681 dev->dev.bus = &vlynq_bus_type;
682 dev->dev.parent = &pdev->dev;
683 dev_set_name(&dev->dev, "vlynq%d", dev->id);
684 dev->dev.platform_data = pdev->dev.platform_data;
685 dev->dev.release = vlynq_device_release;
686
687 dev->regs_start = regs_res->start;
688 dev->regs_end = regs_res->end;
689 dev->mem_start = mem_res->start;
690 dev->mem_end = mem_res->end;
691
3354f73b 692 len = resource_size(regs_res);
55e331cf
FF		 693 if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
694 printk(KERN_ERR "%s: Can't request vlynq registers\n",
695 dev_name(&dev->dev));
696 result = -ENXIO;
697 goto fail_request;
698 }
699
700 dev->local = ioremap(regs_res->start, len);
701 if (!dev->local) {
702 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
703 dev_name(&dev->dev));
704 result = -ENXIO;
705 goto fail_remap;
706 }
707
708 dev->remote = (struct vlynq_regs *)((void *)dev->local +
709 VLYNQ_REMOTE_OFFSET);
710
711 dev->irq = platform_get_irq_byname(pdev, "irq");
712 dev->irq_start = irq_res->start;
713 dev->irq_end = irq_res->end;
714 dev->local_irq = dev->irq_end - dev->irq_start;
715 dev->remote_irq = dev->local_irq - 1;
716
717 if (device_register(&dev->dev))
718 goto fail_register;
719 platform_set_drvdata(pdev, dev);
720
721 printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
722 dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
723 (void *)dev->mem_start);
724
725 dev->dev_id = 0;
726 dev->divisor = vlynq_div_auto;
727 result = __vlynq_enable_device(dev);
728 if (result == 0) {
729 dev->dev_id = readl(&dev->remote->chip);
730 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
731 }
732 if (dev->dev_id)
733 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
734
735 return 0;
736
737fail_register:
738 iounmap(dev->local);
739fail_remap:
740fail_request:
741 release_mem_region(regs_res->start, len);
742 kfree(dev);
743 return result;
744}
745
746static int vlynq_remove(struct platform_device *pdev)
747{
748 struct vlynq_device *dev = platform_get_drvdata(pdev);
749
750 device_unregister(&dev->dev);
751 iounmap(dev->local);
59d42cd4
DC		 752 release_mem_region(dev->regs_start,
753 dev->regs_end - dev->regs_start + 1);
55e331cf
FF		 754
755 kfree(dev);
756
757 return 0;
758}
759
760static struct platform_driver vlynq_platform_driver = {
761 .driver.name = "vlynq",
762 .probe = vlynq_probe,
6dfb6715 763 .remove = vlynq_remove,
55e331cf
FF		 764};
765
766struct bus_type vlynq_bus_type = {
767 .name = "vlynq",
768 .match = vlynq_device_match,
769 .probe = vlynq_device_probe,
770 .remove = vlynq_device_remove,
771};
772EXPORT_SYMBOL(vlynq_bus_type);
773
6dfb6715 774static int vlynq_init(void)
55e331cf
FF		 775{
776 int res = 0;
777
778 res = bus_register(&vlynq_bus_type);
779 if (res)
780 goto fail_bus;
781
782 res = platform_driver_register(&vlynq_platform_driver);
783 if (res)
784 goto fail_platform;
785
786 return 0;
787
788fail_platform:
789 bus_unregister(&vlynq_bus_type);
790fail_bus:
791 return res;
792}
793
6dfb6715 794static void vlynq_exit(void)
55e331cf
FF		 795{
796 platform_driver_unregister(&vlynq_platform_driver);
797 bus_unregister(&vlynq_bus_type);
798}
799
800module_init(vlynq_init);
801module_exit(vlynq_exit);
Linux 6.x block layer and io_uring tree(s)