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5bc7f990 MB |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Turris Mox module configuration bus driver | |
4 | * | |
b37c3848 | 5 | * Copyright (C) 2019 Marek Behún <kabel@kernel.org> |
5bc7f990 MB |
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 | */ | |
25 | static 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 | ||
41 | static inline bool mox_module_known(unsigned int id) | |
42 | { | |
43 | return id >= TURRIS_MOX_MODULE_FIRST && id <= TURRIS_MOX_MODULE_LAST; | |
44 | } | |
45 | ||
46 | static 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, ...) \ | |
55 | static ssize_t \ | |
56 | module_##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 | } \ | |
62 | static DEVICE_ATTR_RO(module_##name) | |
63 | ||
64 | DEF_MODULE_ATTR(id, "0x%x\n", mdev->id); | |
65 | DEF_MODULE_ATTR(name, "%s\n", mox_module_name(mdev->id)); | |
66 | DEF_MODULE_ATTR(description, "%s\n", | |
67 | mox_module_known(mdev->id) ? mox_module_table[mdev->id].desc | |
68 | : ""); | |
69 | ||
70 | static 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 | ||
77 | static const struct attribute_group moxtet_dev_group = { | |
78 | .attrs = moxtet_dev_attrs, | |
79 | }; | |
80 | ||
81 | static const struct attribute_group *moxtet_dev_groups[] = { | |
82 | &moxtet_dev_group, | |
83 | NULL, | |
84 | }; | |
85 | ||
86 | static 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 | ||
54dd5fcb | 105 | static struct bus_type moxtet_bus_type = { |
5bc7f990 MB |
106 | .name = "moxtet", |
107 | .dev_groups = moxtet_dev_groups, | |
108 | .match = moxtet_match, | |
109 | }; | |
5bc7f990 MB |
110 | |
111 | int __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 | } | |
118 | EXPORT_SYMBOL_GPL(__moxtet_register_driver); | |
119 | ||
120 | static 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 | ||
131 | static 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 | ||
139 | static struct moxtet_device * | |
140 | moxtet_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 | ||
163 | static 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 | ||
186 | done: | |
187 | mutex_unlock(&add_mutex); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | static 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 | ||
203 | static struct moxtet_device * | |
204 | of_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 | ||
255 | err_put: | |
256 | put_device(&dev->dev); | |
257 | return ERR_PTR(ret); | |
258 | } | |
259 | ||
260 | static 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 | ||
281 | static void | |
282 | moxtet_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 | */ | |
311 | static 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 | ||
332 | static 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 | ||
385 | static 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 | ||
403 | int 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 | } | |
419 | EXPORT_SYMBOL_GPL(moxtet_device_read); | |
420 | ||
421 | int 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 | } | |
441 | EXPORT_SYMBOL_GPL(moxtet_device_write); | |
442 | ||
443 | int 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 | } | |
453 | EXPORT_SYMBOL_GPL(moxtet_device_written); | |
454 | ||
455 | #ifdef CONFIG_DEBUG_FS | |
456 | static 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 | ||
463 | static 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]; | |
3bf3c974 | 468 | u8 hex[sizeof(bin) * 2 + 1]; |
5bc7f990 MB |
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 | ||
483 | static 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 | ||
490 | static 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 | ||
510 | static 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]; | |
6811d26d | 516 | ssize_t res; |
5bc7f990 MB |
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 | ||
547 | static 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 | ||
555 | static 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; | |
577 | err_remove: | |
578 | debugfs_remove_recursive(root); | |
579 | return PTR_ERR(entry); | |
580 | } | |
581 | ||
582 | static void moxtet_unregister_debugfs(struct moxtet *moxtet) | |
583 | { | |
584 | debugfs_remove_recursive(moxtet->debugfs_root); | |
585 | } | |
586 | #else | |
587 | static inline int moxtet_register_debugfs(struct moxtet *moxtet) | |
588 | { | |
589 | return 0; | |
590 | } | |
591 | ||
592 | static inline void moxtet_unregister_debugfs(struct moxtet *moxtet) | |
593 | { | |
594 | } | |
595 | #endif | |
596 | ||
597 | static 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 | ||
613 | static 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 | ||
635 | static const struct irq_domain_ops moxtet_irq_domain = { | |
636 | .map = moxtet_irq_domain_map, | |
637 | .xlate = moxtet_irq_domain_xlate, | |
638 | }; | |
639 | ||
640 | static 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 | ||
647 | static 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 | ||
654 | static 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 | ||
666 | static 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 | ||
673 | static 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 | ||
693 | static 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 | ||
720 | out: | |
721 | return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE); | |
722 | } | |
723 | ||
724 | static 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 | ||
738 | static 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, | |
e7830f5a | 758 | IRQF_SHARED | IRQF_ONESHOT, "moxtet", moxtet); |
5bc7f990 MB |
759 | if (ret < 0) |
760 | goto err_free; | |
761 | ||
762 | return 0; | |
763 | ||
764 | err_free: | |
765 | moxtet_irq_free(moxtet); | |
766 | return ret; | |
767 | } | |
768 | ||
769 | static 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 | ||
a0386bba | 818 | static void moxtet_remove(struct spi_device *spi) |
5bc7f990 MB |
819 | { |
820 | struct moxtet *moxtet = spi_get_drvdata(spi); | |
5bc7f990 MB |
821 | |
822 | free_irq(moxtet->dev_irq, moxtet); | |
823 | ||
824 | moxtet_irq_free(moxtet); | |
825 | ||
826 | moxtet_unregister_debugfs(moxtet); | |
827 | ||
caebdd3c | 828 | device_for_each_child(moxtet->dev, NULL, __unregister); |
5bc7f990 MB |
829 | |
830 | mutex_destroy(&moxtet->lock); | |
5bc7f990 MB |
831 | } |
832 | ||
aaafe88d SS |
833 | static const struct spi_device_id moxtet_spi_ids[] = { |
834 | { "moxtet" }, | |
835 | { }, | |
836 | }; | |
837 | MODULE_DEVICE_TABLE(spi, moxtet_spi_ids); | |
838 | ||
5bc7f990 MB |
839 | static const struct of_device_id moxtet_dt_ids[] = { |
840 | { .compatible = "cznic,moxtet" }, | |
841 | {}, | |
842 | }; | |
843 | MODULE_DEVICE_TABLE(of, moxtet_dt_ids); | |
844 | ||
845 | static struct spi_driver moxtet_spi_driver = { | |
846 | .driver = { | |
847 | .name = "moxtet", | |
848 | .of_match_table = moxtet_dt_ids, | |
849 | }, | |
aaafe88d | 850 | .id_table = moxtet_spi_ids, |
5bc7f990 MB |
851 | .probe = moxtet_probe, |
852 | .remove = moxtet_remove, | |
853 | }; | |
854 | ||
855 | static int __init moxtet_init(void) | |
856 | { | |
857 | int ret; | |
858 | ||
859 | ret = bus_register(&moxtet_bus_type); | |
860 | if (ret < 0) { | |
861 | pr_err("moxtet bus registration failed: %d\n", ret); | |
862 | goto error; | |
863 | } | |
864 | ||
865 | ret = spi_register_driver(&moxtet_spi_driver); | |
866 | if (ret < 0) { | |
867 | pr_err("moxtet spi driver registration failed: %d\n", ret); | |
868 | goto error_bus; | |
869 | } | |
870 | ||
871 | return 0; | |
872 | ||
873 | error_bus: | |
874 | bus_unregister(&moxtet_bus_type); | |
875 | error: | |
876 | return ret; | |
877 | } | |
878 | postcore_initcall_sync(moxtet_init); | |
879 | ||
880 | static void __exit moxtet_exit(void) | |
881 | { | |
882 | spi_unregister_driver(&moxtet_spi_driver); | |
883 | bus_unregister(&moxtet_bus_type); | |
884 | } | |
885 | module_exit(moxtet_exit); | |
886 | ||
b37c3848 | 887 | MODULE_AUTHOR("Marek Behun <kabel@kernel.org>"); |
5bc7f990 MB |
888 | MODULE_DESCRIPTION("CZ.NIC's Turris Mox module configuration bus"); |
889 | MODULE_LICENSE("GPL v2"); |