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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Turris Mox module configuration bus driver
4 *
5 * Copyright (C) 2019 Marek Behún <kabel@kernel.org>
6 */
7
8#include <dt-bindings/bus/moxtet.h>
9#include <linux/bitops.h>
10#include <linux/debugfs.h>
11#include <linux/interrupt.h>
12#include <linux/module.h>
13#include <linux/moxtet.h>
14#include <linux/mutex.h>
15#include <linux/of_device.h>
16#include <linux/of_irq.h>
17#include <linux/spi/spi.h>
18
19/*
20 * @name: module name for sysfs
21 * @hwirq_base: base index for IRQ for this module (-1 if no IRQs)
22 * @nirqs: how many interrupts does the shift register provide
23 * @desc: module description for kernel log
24 */
25static const struct {
26 const char *name;
27 int hwirq_base;
28 int nirqs;
29 const char *desc;
30} mox_module_table[] = {
31 /* do not change order of this array! */
32 { NULL, 0, 0, NULL },
33 { "sfp", -1, 0, "MOX D (SFP cage)" },
34 { "pci", MOXTET_IRQ_PCI, 1, "MOX B (Mini-PCIe)" },
35 { "topaz", MOXTET_IRQ_TOPAZ, 1, "MOX C (4 port switch)" },
36 { "peridot", MOXTET_IRQ_PERIDOT(0), 1, "MOX E (8 port switch)" },
37 { "usb3", MOXTET_IRQ_USB3, 2, "MOX F (USB 3.0)" },
38 { "pci-bridge", -1, 0, "MOX G (Mini-PCIe bridge)" },
39};
40
41static inline bool mox_module_known(unsigned int id)
42{
43 return id >= TURRIS_MOX_MODULE_FIRST && id <= TURRIS_MOX_MODULE_LAST;
44}
45
46static inline const char *mox_module_name(unsigned int id)
47{
48 if (mox_module_known(id))
49 return mox_module_table[id].name;
50 else
51 return "unknown";
52}
53
54#define DEF_MODULE_ATTR(name, fmt, ...) \
55static ssize_t \
56module_##name##_show(struct device *dev, struct device_attribute *a, \
57 char *buf) \
58{ \
59 struct moxtet_device *mdev = to_moxtet_device(dev); \
60 return sprintf(buf, (fmt), __VA_ARGS__); \
61} \
62static DEVICE_ATTR_RO(module_##name)
63
64DEF_MODULE_ATTR(id, "0x%x\n", mdev->id);
65DEF_MODULE_ATTR(name, "%s\n", mox_module_name(mdev->id));
66DEF_MODULE_ATTR(description, "%s\n",
67 mox_module_known(mdev->id) ? mox_module_table[mdev->id].desc
68 : "");
69
70static struct attribute *moxtet_dev_attrs[] = {
71 &dev_attr_module_id.attr,
72 &dev_attr_module_name.attr,
73 &dev_attr_module_description.attr,
74 NULL,
75};
76
77static const struct attribute_group moxtet_dev_group = {
78 .attrs = moxtet_dev_attrs,
79};
80
81static const struct attribute_group *moxtet_dev_groups[] = {
82 &moxtet_dev_group,
83 NULL,
84};
85
86static int moxtet_match(struct device *dev, struct device_driver *drv)
87{
88 struct moxtet_device *mdev = to_moxtet_device(dev);
89 struct moxtet_driver *tdrv = to_moxtet_driver(drv);
90 const enum turris_mox_module_id *t;
91
92 if (of_driver_match_device(dev, drv))
93 return 1;
94
95 if (!tdrv->id_table)
96 return 0;
97
98 for (t = tdrv->id_table; *t; ++t)
99 if (*t == mdev->id)
100 return 1;
101
102 return 0;
103}
104
105static struct bus_type moxtet_bus_type = {
106 .name = "moxtet",
107 .dev_groups = moxtet_dev_groups,
108 .match = moxtet_match,
109};
110
111int __moxtet_register_driver(struct module *owner,
112 struct moxtet_driver *mdrv)
113{
114 mdrv->driver.owner = owner;
115 mdrv->driver.bus = &moxtet_bus_type;
116 return driver_register(&mdrv->driver);
117}
118EXPORT_SYMBOL_GPL(__moxtet_register_driver);
119
120static int moxtet_dev_check(struct device *dev, void *data)
121{
122 struct moxtet_device *mdev = to_moxtet_device(dev);
123 struct moxtet_device *new_dev = data;
124
125 if (mdev->moxtet == new_dev->moxtet && mdev->id == new_dev->id &&
126 mdev->idx == new_dev->idx)
127 return -EBUSY;
128 return 0;
129}
130
131static void moxtet_dev_release(struct device *dev)
132{
133 struct moxtet_device *mdev = to_moxtet_device(dev);
134
135 put_device(mdev->moxtet->dev);
136 kfree(mdev);
137}
138
139static struct moxtet_device *
140moxtet_alloc_device(struct moxtet *moxtet)
141{
142 struct moxtet_device *dev;
143
144 if (!get_device(moxtet->dev))
145 return NULL;
146
147 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
148 if (!dev) {
149 put_device(moxtet->dev);
150 return NULL;
151 }
152
153 dev->moxtet = moxtet;
154 dev->dev.parent = moxtet->dev;
155 dev->dev.bus = &moxtet_bus_type;
156 dev->dev.release = moxtet_dev_release;
157
158 device_initialize(&dev->dev);
159
160 return dev;
161}
162
163static int moxtet_add_device(struct moxtet_device *dev)
164{
165 static DEFINE_MUTEX(add_mutex);
166 int ret;
167
168 if (dev->idx >= TURRIS_MOX_MAX_MODULES || dev->id > 0xf)
169 return -EINVAL;
170
171 dev_set_name(&dev->dev, "moxtet-%s.%u", mox_module_name(dev->id),
172 dev->idx);
173
174 mutex_lock(&add_mutex);
175
176 ret = bus_for_each_dev(&moxtet_bus_type, NULL, dev,
177 moxtet_dev_check);
178 if (ret)
179 goto done;
180
181 ret = device_add(&dev->dev);
182 if (ret < 0)
183 dev_err(dev->moxtet->dev, "can't add %s, status %d\n",
184 dev_name(dev->moxtet->dev), ret);
185
186done:
187 mutex_unlock(&add_mutex);
188 return ret;
189}
190
191static int __unregister(struct device *dev, void *null)
192{
193 if (dev->of_node) {
194 of_node_clear_flag(dev->of_node, OF_POPULATED);
195 of_node_put(dev->of_node);
196 }
197
198 device_unregister(dev);
199
200 return 0;
201}
202
203static struct moxtet_device *
204of_register_moxtet_device(struct moxtet *moxtet, struct device_node *nc)
205{
206 struct moxtet_device *dev;
207 u32 val;
208 int ret;
209
210 dev = moxtet_alloc_device(moxtet);
211 if (!dev) {
212 dev_err(moxtet->dev,
213 "Moxtet device alloc error for %pOF\n", nc);
214 return ERR_PTR(-ENOMEM);
215 }
216
217 ret = of_property_read_u32(nc, "reg", &val);
218 if (ret) {
219 dev_err(moxtet->dev, "%pOF has no valid 'reg' property (%d)\n",
220 nc, ret);
221 goto err_put;
222 }
223
224 dev->idx = val;
225
226 if (dev->idx >= TURRIS_MOX_MAX_MODULES) {
227 dev_err(moxtet->dev, "%pOF Moxtet address 0x%x out of range\n",
228 nc, dev->idx);
229 ret = -EINVAL;
230 goto err_put;
231 }
232
233 dev->id = moxtet->modules[dev->idx];
234
235 if (!dev->id) {
236 dev_err(moxtet->dev, "%pOF Moxtet address 0x%x is empty\n", nc,
237 dev->idx);
238 ret = -ENODEV;
239 goto err_put;
240 }
241
242 of_node_get(nc);
243 dev->dev.of_node = nc;
244
245 ret = moxtet_add_device(dev);
246 if (ret) {
247 dev_err(moxtet->dev,
248 "Moxtet device register error for %pOF\n", nc);
249 of_node_put(nc);
250 goto err_put;
251 }
252
253 return dev;
254
255err_put:
256 put_device(&dev->dev);
257 return ERR_PTR(ret);
258}
259
260static void of_register_moxtet_devices(struct moxtet *moxtet)
261{
262 struct moxtet_device *dev;
263 struct device_node *nc;
264
265 if (!moxtet->dev->of_node)
266 return;
267
268 for_each_available_child_of_node(moxtet->dev->of_node, nc) {
269 if (of_node_test_and_set_flag(nc, OF_POPULATED))
270 continue;
271 dev = of_register_moxtet_device(moxtet, nc);
272 if (IS_ERR(dev)) {
273 dev_warn(moxtet->dev,
274 "Failed to create Moxtet device for %pOF\n",
275 nc);
276 of_node_clear_flag(nc, OF_POPULATED);
277 }
278 }
279}
280
281static void
282moxtet_register_devices_from_topology(struct moxtet *moxtet)
283{
284 struct moxtet_device *dev;
285 int i, ret;
286
287 for (i = 0; i < moxtet->count; ++i) {
288 dev = moxtet_alloc_device(moxtet);
289 if (!dev) {
290 dev_err(moxtet->dev, "Moxtet device %u alloc error\n",
291 i);
292 continue;
293 }
294
295 dev->idx = i;
296 dev->id = moxtet->modules[i];
297
298 ret = moxtet_add_device(dev);
299 if (ret && ret != -EBUSY) {
300 put_device(&dev->dev);
301 dev_err(moxtet->dev,
302 "Moxtet device %u register error: %i\n", i,
303 ret);
304 }
305 }
306}
307
308/*
309 * @nsame: how many modules with same id are already in moxtet->modules
310 */
311static int moxtet_set_irq(struct moxtet *moxtet, int idx, int id, int nsame)
312{
313 int i, first;
314 struct moxtet_irqpos *pos;
315
316 first = mox_module_table[id].hwirq_base +
317 nsame * mox_module_table[id].nirqs;
318
319 if (first + mox_module_table[id].nirqs > MOXTET_NIRQS)
320 return -EINVAL;
321
322 for (i = 0; i < mox_module_table[id].nirqs; ++i) {
323 pos = &moxtet->irq.position[first + i];
324 pos->idx = idx;
325 pos->bit = i;
326 moxtet->irq.exists |= BIT(first + i);
327 }
328
329 return 0;
330}
331
332static int moxtet_find_topology(struct moxtet *moxtet)
333{
334 u8 buf[TURRIS_MOX_MAX_MODULES];
335 int cnts[TURRIS_MOX_MODULE_LAST];
336 int i, ret;
337
338 memset(cnts, 0, sizeof(cnts));
339
340 ret = spi_read(to_spi_device(moxtet->dev), buf, TURRIS_MOX_MAX_MODULES);
341 if (ret < 0)
342 return ret;
343
344 if (buf[0] == TURRIS_MOX_CPU_ID_EMMC) {
345 dev_info(moxtet->dev, "Found MOX A (eMMC CPU) module\n");
346 } else if (buf[0] == TURRIS_MOX_CPU_ID_SD) {
347 dev_info(moxtet->dev, "Found MOX A (CPU) module\n");
348 } else {
349 dev_err(moxtet->dev, "Invalid Turris MOX A CPU module 0x%02x\n",
350 buf[0]);
351 return -ENODEV;
352 }
353
354 moxtet->count = 0;
355
356 for (i = 1; i < TURRIS_MOX_MAX_MODULES; ++i) {
357 int id;
358
359 if (buf[i] == 0xff)
360 break;
361
362 id = buf[i] & 0xf;
363
364 moxtet->modules[i-1] = id;
365 ++moxtet->count;
366
367 if (mox_module_known(id)) {
368 dev_info(moxtet->dev, "Found %s module\n",
369 mox_module_table[id].desc);
370
371 if (moxtet_set_irq(moxtet, i-1, id, cnts[id]++) < 0)
372 dev_err(moxtet->dev,
373 " Cannot set IRQ for module %s\n",
374 mox_module_table[id].desc);
375 } else {
376 dev_warn(moxtet->dev,
377 "Unknown Moxtet module found (ID 0x%02x)\n",
378 id);
379 }
380 }
381
382 return 0;
383}
384
385static int moxtet_spi_read(struct moxtet *moxtet, u8 *buf)
386{
387 struct spi_transfer xfer = {
388 .rx_buf = buf,
389 .tx_buf = moxtet->tx,
390 .len = moxtet->count + 1
391 };
392 int ret;
393
394 mutex_lock(&moxtet->lock);
395
396 ret = spi_sync_transfer(to_spi_device(moxtet->dev), &xfer, 1);
397
398 mutex_unlock(&moxtet->lock);
399
400 return ret;
401}
402
403int moxtet_device_read(struct device *dev)
404{
405 struct moxtet_device *mdev = to_moxtet_device(dev);
406 struct moxtet *moxtet = mdev->moxtet;
407 u8 buf[TURRIS_MOX_MAX_MODULES];
408 int ret;
409
410 if (mdev->idx >= moxtet->count)
411 return -EINVAL;
412
413 ret = moxtet_spi_read(moxtet, buf);
414 if (ret < 0)
415 return ret;
416
417 return buf[mdev->idx + 1] >> 4;
418}
419EXPORT_SYMBOL_GPL(moxtet_device_read);
420
421int moxtet_device_write(struct device *dev, u8 val)
422{
423 struct moxtet_device *mdev = to_moxtet_device(dev);
424 struct moxtet *moxtet = mdev->moxtet;
425 int ret;
426
427 if (mdev->idx >= moxtet->count)
428 return -EINVAL;
429
430 mutex_lock(&moxtet->lock);
431
432 moxtet->tx[moxtet->count - mdev->idx] = val;
433
434 ret = spi_write(to_spi_device(moxtet->dev), moxtet->tx,
435 moxtet->count + 1);
436
437 mutex_unlock(&moxtet->lock);
438
439 return ret;
440}
441EXPORT_SYMBOL_GPL(moxtet_device_write);
442
443int moxtet_device_written(struct device *dev)
444{
445 struct moxtet_device *mdev = to_moxtet_device(dev);
446 struct moxtet *moxtet = mdev->moxtet;
447
448 if (mdev->idx >= moxtet->count)
449 return -EINVAL;
450
451 return moxtet->tx[moxtet->count - mdev->idx];
452}
453EXPORT_SYMBOL_GPL(moxtet_device_written);
454
455#ifdef CONFIG_DEBUG_FS
456static int moxtet_debug_open(struct inode *inode, struct file *file)
457{
458 file->private_data = inode->i_private;
459
460 return nonseekable_open(inode, file);
461}
462
463static ssize_t input_read(struct file *file, char __user *buf, size_t len,
464 loff_t *ppos)
465{
466 struct moxtet *moxtet = file->private_data;
467 u8 bin[TURRIS_MOX_MAX_MODULES];
468 u8 hex[sizeof(bin) * 2 + 1];
469 int ret, n;
470
471 ret = moxtet_spi_read(moxtet, bin);
472 if (ret < 0)
473 return ret;
474
475 n = moxtet->count + 1;
476 bin2hex(hex, bin, n);
477
478 hex[2*n] = '\n';
479
480 return simple_read_from_buffer(buf, len, ppos, hex, 2*n + 1);
481}
482
483static const struct file_operations input_fops = {
484 .owner = THIS_MODULE,
485 .open = moxtet_debug_open,
486 .read = input_read,
487 .llseek = no_llseek,
488};
489
490static ssize_t output_read(struct file *file, char __user *buf, size_t len,
491 loff_t *ppos)
492{
493 struct moxtet *moxtet = file->private_data;
494 u8 hex[TURRIS_MOX_MAX_MODULES * 2 + 1];
495 u8 *p = hex;
496 int i;
497
498 mutex_lock(&moxtet->lock);
499
500 for (i = 0; i < moxtet->count; ++i)
501 p = hex_byte_pack(p, moxtet->tx[moxtet->count - i]);
502
503 mutex_unlock(&moxtet->lock);
504
505 *p++ = '\n';
506
507 return simple_read_from_buffer(buf, len, ppos, hex, p - hex);
508}
509
510static ssize_t output_write(struct file *file, const char __user *buf,
511 size_t len, loff_t *ppos)
512{
513 struct moxtet *moxtet = file->private_data;
514 u8 bin[TURRIS_MOX_MAX_MODULES];
515 u8 hex[sizeof(bin) * 2 + 1];
516 ssize_t res;
517 loff_t dummy = 0;
518 int err, i;
519
520 if (len > 2 * moxtet->count + 1 || len < 2 * moxtet->count)
521 return -EINVAL;
522
523 res = simple_write_to_buffer(hex, sizeof(hex), &dummy, buf, len);
524 if (res < 0)
525 return res;
526
527 if (len % 2 == 1 && hex[len - 1] != '\n')
528 return -EINVAL;
529
530 err = hex2bin(bin, hex, moxtet->count);
531 if (err < 0)
532 return -EINVAL;
533
534 mutex_lock(&moxtet->lock);
535
536 for (i = 0; i < moxtet->count; ++i)
537 moxtet->tx[moxtet->count - i] = bin[i];
538
539 err = spi_write(to_spi_device(moxtet->dev), moxtet->tx,
540 moxtet->count + 1);
541
542 mutex_unlock(&moxtet->lock);
543
544 return err < 0 ? err : len;
545}
546
547static const struct file_operations output_fops = {
548 .owner = THIS_MODULE,
549 .open = moxtet_debug_open,
550 .read = output_read,
551 .write = output_write,
552 .llseek = no_llseek,
553};
554
555static int moxtet_register_debugfs(struct moxtet *moxtet)
556{
557 struct dentry *root, *entry;
558
559 root = debugfs_create_dir("moxtet", NULL);
560
561 if (IS_ERR(root))
562 return PTR_ERR(root);
563
564 entry = debugfs_create_file_unsafe("input", 0444, root, moxtet,
565 &input_fops);
566 if (IS_ERR(entry))
567 goto err_remove;
568
569 entry = debugfs_create_file_unsafe("output", 0644, root, moxtet,
570 &output_fops);
571 if (IS_ERR(entry))
572 goto err_remove;
573
574 moxtet->debugfs_root = root;
575
576 return 0;
577err_remove:
578 debugfs_remove_recursive(root);
579 return PTR_ERR(entry);
580}
581
582static void moxtet_unregister_debugfs(struct moxtet *moxtet)
583{
584 debugfs_remove_recursive(moxtet->debugfs_root);
585}
586#else
587static inline int moxtet_register_debugfs(struct moxtet *moxtet)
588{
589 return 0;
590}
591
592static inline void moxtet_unregister_debugfs(struct moxtet *moxtet)
593{
594}
595#endif
596
597static int moxtet_irq_domain_map(struct irq_domain *d, unsigned int irq,
598 irq_hw_number_t hw)
599{
600 struct moxtet *moxtet = d->host_data;
601
602 if (hw >= MOXTET_NIRQS || !(moxtet->irq.exists & BIT(hw))) {
603 dev_err(moxtet->dev, "Invalid hw irq number\n");
604 return -EINVAL;
605 }
606
607 irq_set_chip_data(irq, d->host_data);
608 irq_set_chip_and_handler(irq, &moxtet->irq.chip, handle_level_irq);
609
610 return 0;
611}
612
613static int moxtet_irq_domain_xlate(struct irq_domain *d,
614 struct device_node *ctrlr,
615 const u32 *intspec, unsigned int intsize,
616 unsigned long *out_hwirq,
617 unsigned int *out_type)
618{
619 struct moxtet *moxtet = d->host_data;
620 int irq;
621
622 if (WARN_ON(intsize < 1))
623 return -EINVAL;
624
625 irq = intspec[0];
626
627 if (irq >= MOXTET_NIRQS || !(moxtet->irq.exists & BIT(irq)))
628 return -EINVAL;
629
630 *out_hwirq = irq;
631 *out_type = IRQ_TYPE_NONE;
632 return 0;
633}
634
635static const struct irq_domain_ops moxtet_irq_domain = {
636 .map = moxtet_irq_domain_map,
637 .xlate = moxtet_irq_domain_xlate,
638};
639
640static void moxtet_irq_mask(struct irq_data *d)
641{
642 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
643
644 moxtet->irq.masked |= BIT(d->hwirq);
645}
646
647static void moxtet_irq_unmask(struct irq_data *d)
648{
649 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
650
651 moxtet->irq.masked &= ~BIT(d->hwirq);
652}
653
654static void moxtet_irq_print_chip(struct irq_data *d, struct seq_file *p)
655{
656 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
657 struct moxtet_irqpos *pos = &moxtet->irq.position[d->hwirq];
658 int id;
659
660 id = moxtet->modules[pos->idx];
661
662 seq_printf(p, " moxtet-%s.%i#%i", mox_module_name(id), pos->idx,
663 pos->bit);
664}
665
666static const struct irq_chip moxtet_irq_chip = {
667 .name = "moxtet",
668 .irq_mask = moxtet_irq_mask,
669 .irq_unmask = moxtet_irq_unmask,
670 .irq_print_chip = moxtet_irq_print_chip,
671};
672
673static int moxtet_irq_read(struct moxtet *moxtet, unsigned long *map)
674{
675 struct moxtet_irqpos *pos = moxtet->irq.position;
676 u8 buf[TURRIS_MOX_MAX_MODULES];
677 int i, ret;
678
679 ret = moxtet_spi_read(moxtet, buf);
680 if (ret < 0)
681 return ret;
682
683 *map = 0;
684
685 for_each_set_bit(i, &moxtet->irq.exists, MOXTET_NIRQS) {
686 if (!(buf[pos[i].idx + 1] & BIT(4 + pos[i].bit)))
687 set_bit(i, map);
688 }
689
690 return 0;
691}
692
693static irqreturn_t moxtet_irq_thread_fn(int irq, void *data)
694{
695 struct moxtet *moxtet = data;
696 unsigned long set;
697 int nhandled = 0, i, sub_irq, ret;
698
699 ret = moxtet_irq_read(moxtet, &set);
700 if (ret < 0)
701 goto out;
702
703 set &= ~moxtet->irq.masked;
704
705 do {
706 for_each_set_bit(i, &set, MOXTET_NIRQS) {
707 sub_irq = irq_find_mapping(moxtet->irq.domain, i);
708 handle_nested_irq(sub_irq);
709 dev_dbg(moxtet->dev, "%i irq\n", i);
710 ++nhandled;
711 }
712
713 ret = moxtet_irq_read(moxtet, &set);
714 if (ret < 0)
715 goto out;
716
717 set &= ~moxtet->irq.masked;
718 } while (set);
719
720out:
721 return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
722}
723
724static void moxtet_irq_free(struct moxtet *moxtet)
725{
726 int i, irq;
727
728 for (i = 0; i < MOXTET_NIRQS; ++i) {
729 if (moxtet->irq.exists & BIT(i)) {
730 irq = irq_find_mapping(moxtet->irq.domain, i);
731 irq_dispose_mapping(irq);
732 }
733 }
734
735 irq_domain_remove(moxtet->irq.domain);
736}
737
738static int moxtet_irq_setup(struct moxtet *moxtet)
739{
740 int i, ret;
741
742 moxtet->irq.domain = irq_domain_add_simple(moxtet->dev->of_node,
743 MOXTET_NIRQS, 0,
744 &moxtet_irq_domain, moxtet);
745 if (moxtet->irq.domain == NULL) {
746 dev_err(moxtet->dev, "Could not add IRQ domain\n");
747 return -ENOMEM;
748 }
749
750 for (i = 0; i < MOXTET_NIRQS; ++i)
751 if (moxtet->irq.exists & BIT(i))
752 irq_create_mapping(moxtet->irq.domain, i);
753
754 moxtet->irq.chip = moxtet_irq_chip;
755 moxtet->irq.masked = ~0;
756
757 ret = request_threaded_irq(moxtet->dev_irq, NULL, moxtet_irq_thread_fn,
758 IRQF_ONESHOT, "moxtet", moxtet);
759 if (ret < 0)
760 goto err_free;
761
762 return 0;
763
764err_free:
765 moxtet_irq_free(moxtet);
766 return ret;
767}
768
769static int moxtet_probe(struct spi_device *spi)
770{
771 struct moxtet *moxtet;
772 int ret;
773
774 ret = spi_setup(spi);
775 if (ret < 0)
776 return ret;
777
778 moxtet = devm_kzalloc(&spi->dev, sizeof(struct moxtet),
779 GFP_KERNEL);
780 if (!moxtet)
781 return -ENOMEM;
782
783 moxtet->dev = &spi->dev;
784 spi_set_drvdata(spi, moxtet);
785
786 mutex_init(&moxtet->lock);
787
788 moxtet->dev_irq = of_irq_get(moxtet->dev->of_node, 0);
789 if (moxtet->dev_irq == -EPROBE_DEFER)
790 return -EPROBE_DEFER;
791
792 if (moxtet->dev_irq <= 0) {
793 dev_err(moxtet->dev, "No IRQ resource found\n");
794 return -ENXIO;
795 }
796
797 ret = moxtet_find_topology(moxtet);
798 if (ret < 0)
799 return ret;
800
801 if (moxtet->irq.exists) {
802 ret = moxtet_irq_setup(moxtet);
803 if (ret < 0)
804 return ret;
805 }
806
807 of_register_moxtet_devices(moxtet);
808 moxtet_register_devices_from_topology(moxtet);
809
810 ret = moxtet_register_debugfs(moxtet);
811 if (ret < 0)
812 dev_warn(moxtet->dev, "Failed creating debugfs entries: %i\n",
813 ret);
814
815 return 0;
816}
817
818static void moxtet_remove(struct spi_device *spi)
819{
820 struct moxtet *moxtet = spi_get_drvdata(spi);
821
822 free_irq(moxtet->dev_irq, moxtet);
823
824 moxtet_irq_free(moxtet);
825
826 moxtet_unregister_debugfs(moxtet);
827
828 device_for_each_child(moxtet->dev, NULL, __unregister);
829
830 mutex_destroy(&moxtet->lock);
831}
832
833static const struct of_device_id moxtet_dt_ids[] = {
834 { .compatible = "cznic,moxtet" },
835 {},
836};
837MODULE_DEVICE_TABLE(of, moxtet_dt_ids);
838
839static struct spi_driver moxtet_spi_driver = {
840 .driver = {
841 .name = "moxtet",
842 .of_match_table = moxtet_dt_ids,
843 },
844 .probe = moxtet_probe,
845 .remove = moxtet_remove,
846};
847
848static int __init moxtet_init(void)
849{
850 int ret;
851
852 ret = bus_register(&moxtet_bus_type);
853 if (ret < 0) {
854 pr_err("moxtet bus registration failed: %d\n", ret);
855 goto error;
856 }
857
858 ret = spi_register_driver(&moxtet_spi_driver);
859 if (ret < 0) {
860 pr_err("moxtet spi driver registration failed: %d\n", ret);
861 goto error_bus;
862 }
863
864 return 0;
865
866error_bus:
867 bus_unregister(&moxtet_bus_type);
868error:
869 return ret;
870}
871postcore_initcall_sync(moxtet_init);
872
873static void __exit moxtet_exit(void)
874{
875 spi_unregister_driver(&moxtet_spi_driver);
876 bus_unregister(&moxtet_bus_type);
877}
878module_exit(moxtet_exit);
879
880MODULE_AUTHOR("Marek Behun <kabel@kernel.org>");
881MODULE_DESCRIPTION("CZ.NIC's Turris Mox module configuration bus");
882MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Turris Mox module configuration bus driver
4 *
5 * Copyright (C) 2019 Marek Behun <marek.behun@nic.cz>
6 */
7
8#include <dt-bindings/bus/moxtet.h>
9#include <linux/bitops.h>
10#include <linux/debugfs.h>
11#include <linux/interrupt.h>
12#include <linux/module.h>
13#include <linux/moxtet.h>
14#include <linux/mutex.h>
15#include <linux/of_device.h>
16#include <linux/of_irq.h>
17#include <linux/spi/spi.h>
18
19/*
20 * @name: module name for sysfs
21 * @hwirq_base: base index for IRQ for this module (-1 if no IRQs)
22 * @nirqs: how many interrupts does the shift register provide
23 * @desc: module description for kernel log
24 */
25static const struct {
26 const char *name;
27 int hwirq_base;
28 int nirqs;
29 const char *desc;
30} mox_module_table[] = {
31 /* do not change order of this array! */
32 { NULL, 0, 0, NULL },
33 { "sfp", -1, 0, "MOX D (SFP cage)" },
34 { "pci", MOXTET_IRQ_PCI, 1, "MOX B (Mini-PCIe)" },
35 { "topaz", MOXTET_IRQ_TOPAZ, 1, "MOX C (4 port switch)" },
36 { "peridot", MOXTET_IRQ_PERIDOT(0), 1, "MOX E (8 port switch)" },
37 { "usb3", MOXTET_IRQ_USB3, 2, "MOX F (USB 3.0)" },
38 { "pci-bridge", -1, 0, "MOX G (Mini-PCIe bridge)" },
39};
40
41static inline bool mox_module_known(unsigned int id)
42{
43 return id >= TURRIS_MOX_MODULE_FIRST && id <= TURRIS_MOX_MODULE_LAST;
44}
45
46static inline const char *mox_module_name(unsigned int id)
47{
48 if (mox_module_known(id))
49 return mox_module_table[id].name;
50 else
51 return "unknown";
52}
53
54#define DEF_MODULE_ATTR(name, fmt, ...) \
55static ssize_t \
56module_##name##_show(struct device *dev, struct device_attribute *a, \
57 char *buf) \
58{ \
59 struct moxtet_device *mdev = to_moxtet_device(dev); \
60 return sprintf(buf, (fmt), __VA_ARGS__); \
61} \
62static DEVICE_ATTR_RO(module_##name)
63
64DEF_MODULE_ATTR(id, "0x%x\n", mdev->id);
65DEF_MODULE_ATTR(name, "%s\n", mox_module_name(mdev->id));
66DEF_MODULE_ATTR(description, "%s\n",
67 mox_module_known(mdev->id) ? mox_module_table[mdev->id].desc
68 : "");
69
70static struct attribute *moxtet_dev_attrs[] = {
71 &dev_attr_module_id.attr,
72 &dev_attr_module_name.attr,
73 &dev_attr_module_description.attr,
74 NULL,
75};
76
77static const struct attribute_group moxtet_dev_group = {
78 .attrs = moxtet_dev_attrs,
79};
80
81static const struct attribute_group *moxtet_dev_groups[] = {
82 &moxtet_dev_group,
83 NULL,
84};
85
86static int moxtet_match(struct device *dev, struct device_driver *drv)
87{
88 struct moxtet_device *mdev = to_moxtet_device(dev);
89 struct moxtet_driver *tdrv = to_moxtet_driver(drv);
90 const enum turris_mox_module_id *t;
91
92 if (of_driver_match_device(dev, drv))
93 return 1;
94
95 if (!tdrv->id_table)
96 return 0;
97
98 for (t = tdrv->id_table; *t; ++t)
99 if (*t == mdev->id)
100 return 1;
101
102 return 0;
103}
104
105struct bus_type moxtet_bus_type = {
106 .name = "moxtet",
107 .dev_groups = moxtet_dev_groups,
108 .match = moxtet_match,
109};
110EXPORT_SYMBOL_GPL(moxtet_bus_type);
111
112int __moxtet_register_driver(struct module *owner,
113 struct moxtet_driver *mdrv)
114{
115 mdrv->driver.owner = owner;
116 mdrv->driver.bus = &moxtet_bus_type;
117 return driver_register(&mdrv->driver);
118}
119EXPORT_SYMBOL_GPL(__moxtet_register_driver);
120
121static int moxtet_dev_check(struct device *dev, void *data)
122{
123 struct moxtet_device *mdev = to_moxtet_device(dev);
124 struct moxtet_device *new_dev = data;
125
126 if (mdev->moxtet == new_dev->moxtet && mdev->id == new_dev->id &&
127 mdev->idx == new_dev->idx)
128 return -EBUSY;
129 return 0;
130}
131
132static void moxtet_dev_release(struct device *dev)
133{
134 struct moxtet_device *mdev = to_moxtet_device(dev);
135
136 put_device(mdev->moxtet->dev);
137 kfree(mdev);
138}
139
140static struct moxtet_device *
141moxtet_alloc_device(struct moxtet *moxtet)
142{
143 struct moxtet_device *dev;
144
145 if (!get_device(moxtet->dev))
146 return NULL;
147
148 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
149 if (!dev) {
150 put_device(moxtet->dev);
151 return NULL;
152 }
153
154 dev->moxtet = moxtet;
155 dev->dev.parent = moxtet->dev;
156 dev->dev.bus = &moxtet_bus_type;
157 dev->dev.release = moxtet_dev_release;
158
159 device_initialize(&dev->dev);
160
161 return dev;
162}
163
164static int moxtet_add_device(struct moxtet_device *dev)
165{
166 static DEFINE_MUTEX(add_mutex);
167 int ret;
168
169 if (dev->idx >= TURRIS_MOX_MAX_MODULES || dev->id > 0xf)
170 return -EINVAL;
171
172 dev_set_name(&dev->dev, "moxtet-%s.%u", mox_module_name(dev->id),
173 dev->idx);
174
175 mutex_lock(&add_mutex);
176
177 ret = bus_for_each_dev(&moxtet_bus_type, NULL, dev,
178 moxtet_dev_check);
179 if (ret)
180 goto done;
181
182 ret = device_add(&dev->dev);
183 if (ret < 0)
184 dev_err(dev->moxtet->dev, "can't add %s, status %d\n",
185 dev_name(dev->moxtet->dev), ret);
186
187done:
188 mutex_unlock(&add_mutex);
189 return ret;
190}
191
192static int __unregister(struct device *dev, void *null)
193{
194 if (dev->of_node) {
195 of_node_clear_flag(dev->of_node, OF_POPULATED);
196 of_node_put(dev->of_node);
197 }
198
199 device_unregister(dev);
200
201 return 0;
202}
203
204static struct moxtet_device *
205of_register_moxtet_device(struct moxtet *moxtet, struct device_node *nc)
206{
207 struct moxtet_device *dev;
208 u32 val;
209 int ret;
210
211 dev = moxtet_alloc_device(moxtet);
212 if (!dev) {
213 dev_err(moxtet->dev,
214 "Moxtet device alloc error for %pOF\n", nc);
215 return ERR_PTR(-ENOMEM);
216 }
217
218 ret = of_property_read_u32(nc, "reg", &val);
219 if (ret) {
220 dev_err(moxtet->dev, "%pOF has no valid 'reg' property (%d)\n",
221 nc, ret);
222 goto err_put;
223 }
224
225 dev->idx = val;
226
227 if (dev->idx >= TURRIS_MOX_MAX_MODULES) {
228 dev_err(moxtet->dev, "%pOF Moxtet address 0x%x out of range\n",
229 nc, dev->idx);
230 ret = -EINVAL;
231 goto err_put;
232 }
233
234 dev->id = moxtet->modules[dev->idx];
235
236 if (!dev->id) {
237 dev_err(moxtet->dev, "%pOF Moxtet address 0x%x is empty\n", nc,
238 dev->idx);
239 ret = -ENODEV;
240 goto err_put;
241 }
242
243 of_node_get(nc);
244 dev->dev.of_node = nc;
245
246 ret = moxtet_add_device(dev);
247 if (ret) {
248 dev_err(moxtet->dev,
249 "Moxtet device register error for %pOF\n", nc);
250 of_node_put(nc);
251 goto err_put;
252 }
253
254 return dev;
255
256err_put:
257 put_device(&dev->dev);
258 return ERR_PTR(ret);
259}
260
261static void of_register_moxtet_devices(struct moxtet *moxtet)
262{
263 struct moxtet_device *dev;
264 struct device_node *nc;
265
266 if (!moxtet->dev->of_node)
267 return;
268
269 for_each_available_child_of_node(moxtet->dev->of_node, nc) {
270 if (of_node_test_and_set_flag(nc, OF_POPULATED))
271 continue;
272 dev = of_register_moxtet_device(moxtet, nc);
273 if (IS_ERR(dev)) {
274 dev_warn(moxtet->dev,
275 "Failed to create Moxtet device for %pOF\n",
276 nc);
277 of_node_clear_flag(nc, OF_POPULATED);
278 }
279 }
280}
281
282static void
283moxtet_register_devices_from_topology(struct moxtet *moxtet)
284{
285 struct moxtet_device *dev;
286 int i, ret;
287
288 for (i = 0; i < moxtet->count; ++i) {
289 dev = moxtet_alloc_device(moxtet);
290 if (!dev) {
291 dev_err(moxtet->dev, "Moxtet device %u alloc error\n",
292 i);
293 continue;
294 }
295
296 dev->idx = i;
297 dev->id = moxtet->modules[i];
298
299 ret = moxtet_add_device(dev);
300 if (ret && ret != -EBUSY) {
301 put_device(&dev->dev);
302 dev_err(moxtet->dev,
303 "Moxtet device %u register error: %i\n", i,
304 ret);
305 }
306 }
307}
308
309/*
310 * @nsame: how many modules with same id are already in moxtet->modules
311 */
312static int moxtet_set_irq(struct moxtet *moxtet, int idx, int id, int nsame)
313{
314 int i, first;
315 struct moxtet_irqpos *pos;
316
317 first = mox_module_table[id].hwirq_base +
318 nsame * mox_module_table[id].nirqs;
319
320 if (first + mox_module_table[id].nirqs > MOXTET_NIRQS)
321 return -EINVAL;
322
323 for (i = 0; i < mox_module_table[id].nirqs; ++i) {
324 pos = &moxtet->irq.position[first + i];
325 pos->idx = idx;
326 pos->bit = i;
327 moxtet->irq.exists |= BIT(first + i);
328 }
329
330 return 0;
331}
332
333static int moxtet_find_topology(struct moxtet *moxtet)
334{
335 u8 buf[TURRIS_MOX_MAX_MODULES];
336 int cnts[TURRIS_MOX_MODULE_LAST];
337 int i, ret;
338
339 memset(cnts, 0, sizeof(cnts));
340
341 ret = spi_read(to_spi_device(moxtet->dev), buf, TURRIS_MOX_MAX_MODULES);
342 if (ret < 0)
343 return ret;
344
345 if (buf[0] == TURRIS_MOX_CPU_ID_EMMC) {
346 dev_info(moxtet->dev, "Found MOX A (eMMC CPU) module\n");
347 } else if (buf[0] == TURRIS_MOX_CPU_ID_SD) {
348 dev_info(moxtet->dev, "Found MOX A (CPU) module\n");
349 } else {
350 dev_err(moxtet->dev, "Invalid Turris MOX A CPU module 0x%02x\n",
351 buf[0]);
352 return -ENODEV;
353 }
354
355 moxtet->count = 0;
356
357 for (i = 1; i < TURRIS_MOX_MAX_MODULES; ++i) {
358 int id;
359
360 if (buf[i] == 0xff)
361 break;
362
363 id = buf[i] & 0xf;
364
365 moxtet->modules[i-1] = id;
366 ++moxtet->count;
367
368 if (mox_module_known(id)) {
369 dev_info(moxtet->dev, "Found %s module\n",
370 mox_module_table[id].desc);
371
372 if (moxtet_set_irq(moxtet, i-1, id, cnts[id]++) < 0)
373 dev_err(moxtet->dev,
374 " Cannot set IRQ for module %s\n",
375 mox_module_table[id].desc);
376 } else {
377 dev_warn(moxtet->dev,
378 "Unknown Moxtet module found (ID 0x%02x)\n",
379 id);
380 }
381 }
382
383 return 0;
384}
385
386static int moxtet_spi_read(struct moxtet *moxtet, u8 *buf)
387{
388 struct spi_transfer xfer = {
389 .rx_buf = buf,
390 .tx_buf = moxtet->tx,
391 .len = moxtet->count + 1
392 };
393 int ret;
394
395 mutex_lock(&moxtet->lock);
396
397 ret = spi_sync_transfer(to_spi_device(moxtet->dev), &xfer, 1);
398
399 mutex_unlock(&moxtet->lock);
400
401 return ret;
402}
403
404int moxtet_device_read(struct device *dev)
405{
406 struct moxtet_device *mdev = to_moxtet_device(dev);
407 struct moxtet *moxtet = mdev->moxtet;
408 u8 buf[TURRIS_MOX_MAX_MODULES];
409 int ret;
410
411 if (mdev->idx >= moxtet->count)
412 return -EINVAL;
413
414 ret = moxtet_spi_read(moxtet, buf);
415 if (ret < 0)
416 return ret;
417
418 return buf[mdev->idx + 1] >> 4;
419}
420EXPORT_SYMBOL_GPL(moxtet_device_read);
421
422int moxtet_device_write(struct device *dev, u8 val)
423{
424 struct moxtet_device *mdev = to_moxtet_device(dev);
425 struct moxtet *moxtet = mdev->moxtet;
426 int ret;
427
428 if (mdev->idx >= moxtet->count)
429 return -EINVAL;
430
431 mutex_lock(&moxtet->lock);
432
433 moxtet->tx[moxtet->count - mdev->idx] = val;
434
435 ret = spi_write(to_spi_device(moxtet->dev), moxtet->tx,
436 moxtet->count + 1);
437
438 mutex_unlock(&moxtet->lock);
439
440 return ret;
441}
442EXPORT_SYMBOL_GPL(moxtet_device_write);
443
444int moxtet_device_written(struct device *dev)
445{
446 struct moxtet_device *mdev = to_moxtet_device(dev);
447 struct moxtet *moxtet = mdev->moxtet;
448
449 if (mdev->idx >= moxtet->count)
450 return -EINVAL;
451
452 return moxtet->tx[moxtet->count - mdev->idx];
453}
454EXPORT_SYMBOL_GPL(moxtet_device_written);
455
456#ifdef CONFIG_DEBUG_FS
457static int moxtet_debug_open(struct inode *inode, struct file *file)
458{
459 file->private_data = inode->i_private;
460
461 return nonseekable_open(inode, file);
462}
463
464static ssize_t input_read(struct file *file, char __user *buf, size_t len,
465 loff_t *ppos)
466{
467 struct moxtet *moxtet = file->private_data;
468 u8 bin[TURRIS_MOX_MAX_MODULES];
469 u8 hex[sizeof(buf) * 2 + 1];
470 int ret, n;
471
472 ret = moxtet_spi_read(moxtet, bin);
473 if (ret < 0)
474 return ret;
475
476 n = moxtet->count + 1;
477 bin2hex(hex, bin, n);
478
479 hex[2*n] = '\n';
480
481 return simple_read_from_buffer(buf, len, ppos, hex, 2*n + 1);
482}
483
484static const struct file_operations input_fops = {
485 .owner = THIS_MODULE,
486 .open = moxtet_debug_open,
487 .read = input_read,
488 .llseek = no_llseek,
489};
490
491static ssize_t output_read(struct file *file, char __user *buf, size_t len,
492 loff_t *ppos)
493{
494 struct moxtet *moxtet = file->private_data;
495 u8 hex[TURRIS_MOX_MAX_MODULES * 2 + 1];
496 u8 *p = hex;
497 int i;
498
499 mutex_lock(&moxtet->lock);
500
501 for (i = 0; i < moxtet->count; ++i)
502 p = hex_byte_pack(p, moxtet->tx[moxtet->count - i]);
503
504 mutex_unlock(&moxtet->lock);
505
506 *p++ = '\n';
507
508 return simple_read_from_buffer(buf, len, ppos, hex, p - hex);
509}
510
511static ssize_t output_write(struct file *file, const char __user *buf,
512 size_t len, loff_t *ppos)
513{
514 struct moxtet *moxtet = file->private_data;
515 u8 bin[TURRIS_MOX_MAX_MODULES];
516 u8 hex[sizeof(bin) * 2 + 1];
517 ssize_t res;
518 loff_t dummy = 0;
519 int err, i;
520
521 if (len > 2 * moxtet->count + 1 || len < 2 * moxtet->count)
522 return -EINVAL;
523
524 res = simple_write_to_buffer(hex, sizeof(hex), &dummy, buf, len);
525 if (res < 0)
526 return res;
527
528 if (len % 2 == 1 && hex[len - 1] != '\n')
529 return -EINVAL;
530
531 err = hex2bin(bin, hex, moxtet->count);
532 if (err < 0)
533 return -EINVAL;
534
535 mutex_lock(&moxtet->lock);
536
537 for (i = 0; i < moxtet->count; ++i)
538 moxtet->tx[moxtet->count - i] = bin[i];
539
540 err = spi_write(to_spi_device(moxtet->dev), moxtet->tx,
541 moxtet->count + 1);
542
543 mutex_unlock(&moxtet->lock);
544
545 return err < 0 ? err : len;
546}
547
548static const struct file_operations output_fops = {
549 .owner = THIS_MODULE,
550 .open = moxtet_debug_open,
551 .read = output_read,
552 .write = output_write,
553 .llseek = no_llseek,
554};
555
556static int moxtet_register_debugfs(struct moxtet *moxtet)
557{
558 struct dentry *root, *entry;
559
560 root = debugfs_create_dir("moxtet", NULL);
561
562 if (IS_ERR(root))
563 return PTR_ERR(root);
564
565 entry = debugfs_create_file_unsafe("input", 0444, root, moxtet,
566 &input_fops);
567 if (IS_ERR(entry))
568 goto err_remove;
569
570 entry = debugfs_create_file_unsafe("output", 0644, root, moxtet,
571 &output_fops);
572 if (IS_ERR(entry))
573 goto err_remove;
574
575 moxtet->debugfs_root = root;
576
577 return 0;
578err_remove:
579 debugfs_remove_recursive(root);
580 return PTR_ERR(entry);
581}
582
583static void moxtet_unregister_debugfs(struct moxtet *moxtet)
584{
585 debugfs_remove_recursive(moxtet->debugfs_root);
586}
587#else
588static inline int moxtet_register_debugfs(struct moxtet *moxtet)
589{
590 return 0;
591}
592
593static inline void moxtet_unregister_debugfs(struct moxtet *moxtet)
594{
595}
596#endif
597
598static int moxtet_irq_domain_map(struct irq_domain *d, unsigned int irq,
599 irq_hw_number_t hw)
600{
601 struct moxtet *moxtet = d->host_data;
602
603 if (hw >= MOXTET_NIRQS || !(moxtet->irq.exists & BIT(hw))) {
604 dev_err(moxtet->dev, "Invalid hw irq number\n");
605 return -EINVAL;
606 }
607
608 irq_set_chip_data(irq, d->host_data);
609 irq_set_chip_and_handler(irq, &moxtet->irq.chip, handle_level_irq);
610
611 return 0;
612}
613
614static int moxtet_irq_domain_xlate(struct irq_domain *d,
615 struct device_node *ctrlr,
616 const u32 *intspec, unsigned int intsize,
617 unsigned long *out_hwirq,
618 unsigned int *out_type)
619{
620 struct moxtet *moxtet = d->host_data;
621 int irq;
622
623 if (WARN_ON(intsize < 1))
624 return -EINVAL;
625
626 irq = intspec[0];
627
628 if (irq >= MOXTET_NIRQS || !(moxtet->irq.exists & BIT(irq)))
629 return -EINVAL;
630
631 *out_hwirq = irq;
632 *out_type = IRQ_TYPE_NONE;
633 return 0;
634}
635
636static const struct irq_domain_ops moxtet_irq_domain = {
637 .map = moxtet_irq_domain_map,
638 .xlate = moxtet_irq_domain_xlate,
639};
640
641static void moxtet_irq_mask(struct irq_data *d)
642{
643 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
644
645 moxtet->irq.masked |= BIT(d->hwirq);
646}
647
648static void moxtet_irq_unmask(struct irq_data *d)
649{
650 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
651
652 moxtet->irq.masked &= ~BIT(d->hwirq);
653}
654
655static void moxtet_irq_print_chip(struct irq_data *d, struct seq_file *p)
656{
657 struct moxtet *moxtet = irq_data_get_irq_chip_data(d);
658 struct moxtet_irqpos *pos = &moxtet->irq.position[d->hwirq];
659 int id;
660
661 id = moxtet->modules[pos->idx];
662
663 seq_printf(p, " moxtet-%s.%i#%i", mox_module_name(id), pos->idx,
664 pos->bit);
665}
666
667static const struct irq_chip moxtet_irq_chip = {
668 .name = "moxtet",
669 .irq_mask = moxtet_irq_mask,
670 .irq_unmask = moxtet_irq_unmask,
671 .irq_print_chip = moxtet_irq_print_chip,
672};
673
674static int moxtet_irq_read(struct moxtet *moxtet, unsigned long *map)
675{
676 struct moxtet_irqpos *pos = moxtet->irq.position;
677 u8 buf[TURRIS_MOX_MAX_MODULES];
678 int i, ret;
679
680 ret = moxtet_spi_read(moxtet, buf);
681 if (ret < 0)
682 return ret;
683
684 *map = 0;
685
686 for_each_set_bit(i, &moxtet->irq.exists, MOXTET_NIRQS) {
687 if (!(buf[pos[i].idx + 1] & BIT(4 + pos[i].bit)))
688 set_bit(i, map);
689 }
690
691 return 0;
692}
693
694static irqreturn_t moxtet_irq_thread_fn(int irq, void *data)
695{
696 struct moxtet *moxtet = data;
697 unsigned long set;
698 int nhandled = 0, i, sub_irq, ret;
699
700 ret = moxtet_irq_read(moxtet, &set);
701 if (ret < 0)
702 goto out;
703
704 set &= ~moxtet->irq.masked;
705
706 do {
707 for_each_set_bit(i, &set, MOXTET_NIRQS) {
708 sub_irq = irq_find_mapping(moxtet->irq.domain, i);
709 handle_nested_irq(sub_irq);
710 dev_dbg(moxtet->dev, "%i irq\n", i);
711 ++nhandled;
712 }
713
714 ret = moxtet_irq_read(moxtet, &set);
715 if (ret < 0)
716 goto out;
717
718 set &= ~moxtet->irq.masked;
719 } while (set);
720
721out:
722 return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
723}
724
725static void moxtet_irq_free(struct moxtet *moxtet)
726{
727 int i, irq;
728
729 for (i = 0; i < MOXTET_NIRQS; ++i) {
730 if (moxtet->irq.exists & BIT(i)) {
731 irq = irq_find_mapping(moxtet->irq.domain, i);
732 irq_dispose_mapping(irq);
733 }
734 }
735
736 irq_domain_remove(moxtet->irq.domain);
737}
738
739static int moxtet_irq_setup(struct moxtet *moxtet)
740{
741 int i, ret;
742
743 moxtet->irq.domain = irq_domain_add_simple(moxtet->dev->of_node,
744 MOXTET_NIRQS, 0,
745 &moxtet_irq_domain, moxtet);
746 if (moxtet->irq.domain == NULL) {
747 dev_err(moxtet->dev, "Could not add IRQ domain\n");
748 return -ENOMEM;
749 }
750
751 for (i = 0; i < MOXTET_NIRQS; ++i)
752 if (moxtet->irq.exists & BIT(i))
753 irq_create_mapping(moxtet->irq.domain, i);
754
755 moxtet->irq.chip = moxtet_irq_chip;
756 moxtet->irq.masked = ~0;
757
758 ret = request_threaded_irq(moxtet->dev_irq, NULL, moxtet_irq_thread_fn,
759 IRQF_ONESHOT, "moxtet", moxtet);
760 if (ret < 0)
761 goto err_free;
762
763 return 0;
764
765err_free:
766 moxtet_irq_free(moxtet);
767 return ret;
768}
769
770static int moxtet_probe(struct spi_device *spi)
771{
772 struct moxtet *moxtet;
773 int ret;
774
775 ret = spi_setup(spi);
776 if (ret < 0)
777 return ret;
778
779 moxtet = devm_kzalloc(&spi->dev, sizeof(struct moxtet),
780 GFP_KERNEL);
781 if (!moxtet)
782 return -ENOMEM;
783
784 moxtet->dev = &spi->dev;
785 spi_set_drvdata(spi, moxtet);
786
787 mutex_init(&moxtet->lock);
788
789 moxtet->dev_irq = of_irq_get(moxtet->dev->of_node, 0);
790 if (moxtet->dev_irq == -EPROBE_DEFER)
791 return -EPROBE_DEFER;
792
793 if (moxtet->dev_irq <= 0) {
794 dev_err(moxtet->dev, "No IRQ resource found\n");
795 return -ENXIO;
796 }
797
798 ret = moxtet_find_topology(moxtet);
799 if (ret < 0)
800 return ret;
801
802 if (moxtet->irq.exists) {
803 ret = moxtet_irq_setup(moxtet);
804 if (ret < 0)
805 return ret;
806 }
807
808 of_register_moxtet_devices(moxtet);
809 moxtet_register_devices_from_topology(moxtet);
810
811 ret = moxtet_register_debugfs(moxtet);
812 if (ret < 0)
813 dev_warn(moxtet->dev, "Failed creating debugfs entries: %i\n",
814 ret);
815
816 return 0;
817}
818
819static int moxtet_remove(struct spi_device *spi)
820{
821 struct moxtet *moxtet = spi_get_drvdata(spi);
822
823 free_irq(moxtet->dev_irq, moxtet);
824
825 moxtet_irq_free(moxtet);
826
827 moxtet_unregister_debugfs(moxtet);
828
829 device_for_each_child(moxtet->dev, NULL, __unregister);
830
831 mutex_destroy(&moxtet->lock);
832
833 return 0;
834}
835
836static const struct of_device_id moxtet_dt_ids[] = {
837 { .compatible = "cznic,moxtet" },
838 {},
839};
840MODULE_DEVICE_TABLE(of, moxtet_dt_ids);
841
842static struct spi_driver moxtet_spi_driver = {
843 .driver = {
844 .name = "moxtet",
845 .of_match_table = moxtet_dt_ids,
846 },
847 .probe = moxtet_probe,
848 .remove = moxtet_remove,
849};
850
851static int __init moxtet_init(void)
852{
853 int ret;
854
855 ret = bus_register(&moxtet_bus_type);
856 if (ret < 0) {
857 pr_err("moxtet bus registration failed: %d\n", ret);
858 goto error;
859 }
860
861 ret = spi_register_driver(&moxtet_spi_driver);
862 if (ret < 0) {
863 pr_err("moxtet spi driver registration failed: %d\n", ret);
864 goto error_bus;
865 }
866
867 return 0;
868
869error_bus:
870 bus_unregister(&moxtet_bus_type);
871error:
872 return ret;
873}
874postcore_initcall_sync(moxtet_init);
875
876static void __exit moxtet_exit(void)
877{
878 spi_unregister_driver(&moxtet_spi_driver);
879 bus_unregister(&moxtet_bus_type);
880}
881module_exit(moxtet_exit);
882
883MODULE_AUTHOR("Marek Behun <marek.behun@nic.cz>");
884MODULE_DESCRIPTION("CZ.NIC's Turris Mox module configuration bus");
885MODULE_LICENSE("GPL v2");