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9#include <linux/hsi/hsi.h>
10#include <linux/compiler.h>
11#include <linux/list.h>
12#include <linux/kobject.h>
13#include <linux/slab.h>
14#include <linux/string.h>
15#include <linux/notifier.h>
16#include <linux/of.h>
17#include <linux/of_device.h>
18#include "hsi_core.h"
19
20static ssize_t modalias_show(struct device *dev,
21 struct device_attribute *a __maybe_unused, char *buf)
22{
23 return sprintf(buf, "hsi:%s\n", dev_name(dev));
24}
25static DEVICE_ATTR_RO(modalias);
26
27static struct attribute *hsi_bus_dev_attrs[] = {
28 &dev_attr_modalias.attr,
29 NULL,
30};
31ATTRIBUTE_GROUPS(hsi_bus_dev);
32
33static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
34{
35 add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev));
36
37 return 0;
38}
39
40static int hsi_bus_match(struct device *dev, struct device_driver *driver)
41{
42 if (of_driver_match_device(dev, driver))
43 return true;
44
45 if (strcmp(dev_name(dev), driver->name) == 0)
46 return true;
47
48 return false;
49}
50
51static struct bus_type hsi_bus_type = {
52 .name = "hsi",
53 .dev_groups = hsi_bus_dev_groups,
54 .match = hsi_bus_match,
55 .uevent = hsi_bus_uevent,
56};
57
58static void hsi_client_release(struct device *dev)
59{
60 struct hsi_client *cl = to_hsi_client(dev);
61
62 kfree(cl->tx_cfg.channels);
63 kfree(cl->rx_cfg.channels);
64 kfree(cl);
65}
66
67struct hsi_client *hsi_new_client(struct hsi_port *port,
68 struct hsi_board_info *info)
69{
70 struct hsi_client *cl;
71 size_t size;
72
73 cl = kzalloc(sizeof(*cl), GFP_KERNEL);
74 if (!cl)
75 goto err;
76
77 cl->tx_cfg = info->tx_cfg;
78 if (cl->tx_cfg.channels) {
79 size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels);
80 cl->tx_cfg.channels = kmemdup(info->tx_cfg.channels, size,
81 GFP_KERNEL);
82 if (!cl->tx_cfg.channels)
83 goto err_tx;
84 }
85
86 cl->rx_cfg = info->rx_cfg;
87 if (cl->rx_cfg.channels) {
88 size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels);
89 cl->rx_cfg.channels = kmemdup(info->rx_cfg.channels, size,
90 GFP_KERNEL);
91 if (!cl->rx_cfg.channels)
92 goto err_rx;
93 }
94
95 cl->device.bus = &hsi_bus_type;
96 cl->device.parent = &port->device;
97 cl->device.release = hsi_client_release;
98 dev_set_name(&cl->device, "%s", info->name);
99 cl->device.platform_data = info->platform_data;
100 if (info->archdata)
101 cl->device.archdata = *info->archdata;
102 if (device_register(&cl->device) < 0) {
103 pr_err("hsi: failed to register client: %s\n", info->name);
104 put_device(&cl->device);
105 }
106
107 return cl;
108err_rx:
109 kfree(cl->tx_cfg.channels);
110err_tx:
111 kfree(cl);
112err:
113 return NULL;
114}
115EXPORT_SYMBOL_GPL(hsi_new_client);
116
117static void hsi_scan_board_info(struct hsi_controller *hsi)
118{
119 struct hsi_cl_info *cl_info;
120 struct hsi_port *p;
121
122 list_for_each_entry(cl_info, &hsi_board_list, list)
123 if (cl_info->info.hsi_id == hsi->id) {
124 p = hsi_find_port_num(hsi, cl_info->info.port);
125 if (!p)
126 continue;
127 hsi_new_client(p, &cl_info->info);
128 }
129}
130
131#ifdef CONFIG_OF
132static struct hsi_board_info hsi_char_dev_info = {
133 .name = "hsi_char",
134};
135
136static int hsi_of_property_parse_mode(struct device_node *client, char *name,
137 unsigned int *result)
138{
139 const char *mode;
140 int err;
141
142 err = of_property_read_string(client, name, &mode);
143 if (err < 0)
144 return err;
145
146 if (strcmp(mode, "stream") == 0)
147 *result = HSI_MODE_STREAM;
148 else if (strcmp(mode, "frame") == 0)
149 *result = HSI_MODE_FRAME;
150 else
151 return -EINVAL;
152
153 return 0;
154}
155
156static int hsi_of_property_parse_flow(struct device_node *client, char *name,
157 unsigned int *result)
158{
159 const char *flow;
160 int err;
161
162 err = of_property_read_string(client, name, &flow);
163 if (err < 0)
164 return err;
165
166 if (strcmp(flow, "synchronized") == 0)
167 *result = HSI_FLOW_SYNC;
168 else if (strcmp(flow, "pipeline") == 0)
169 *result = HSI_FLOW_PIPE;
170 else
171 return -EINVAL;
172
173 return 0;
174}
175
176static int hsi_of_property_parse_arb_mode(struct device_node *client,
177 char *name, unsigned int *result)
178{
179 const char *arb_mode;
180 int err;
181
182 err = of_property_read_string(client, name, &arb_mode);
183 if (err < 0)
184 return err;
185
186 if (strcmp(arb_mode, "round-robin") == 0)
187 *result = HSI_ARB_RR;
188 else if (strcmp(arb_mode, "priority") == 0)
189 *result = HSI_ARB_PRIO;
190 else
191 return -EINVAL;
192
193 return 0;
194}
195
196static void hsi_add_client_from_dt(struct hsi_port *port,
197 struct device_node *client)
198{
199 struct hsi_client *cl;
200 struct hsi_channel channel;
201 struct property *prop;
202 char name[32];
203 int length, cells, err, i, max_chan, mode;
204
205 cl = kzalloc(sizeof(*cl), GFP_KERNEL);
206 if (!cl)
207 return;
208
209 err = of_modalias_node(client, name, sizeof(name));
210 if (err)
211 goto err;
212
213 err = hsi_of_property_parse_mode(client, "hsi-mode", &mode);
214 if (err) {
215 err = hsi_of_property_parse_mode(client, "hsi-rx-mode",
216 &cl->rx_cfg.mode);
217 if (err)
218 goto err;
219
220 err = hsi_of_property_parse_mode(client, "hsi-tx-mode",
221 &cl->tx_cfg.mode);
222 if (err)
223 goto err;
224 } else {
225 cl->rx_cfg.mode = mode;
226 cl->tx_cfg.mode = mode;
227 }
228
229 err = of_property_read_u32(client, "hsi-speed-kbps",
230 &cl->tx_cfg.speed);
231 if (err)
232 goto err;
233 cl->rx_cfg.speed = cl->tx_cfg.speed;
234
235 err = hsi_of_property_parse_flow(client, "hsi-flow",
236 &cl->rx_cfg.flow);
237 if (err)
238 goto err;
239
240 err = hsi_of_property_parse_arb_mode(client, "hsi-arb-mode",
241 &cl->rx_cfg.arb_mode);
242 if (err)
243 goto err;
244
245 prop = of_find_property(client, "hsi-channel-ids", &length);
246 if (!prop) {
247 err = -EINVAL;
248 goto err;
249 }
250
251 cells = length / sizeof(u32);
252
253 cl->rx_cfg.num_channels = cells;
254 cl->tx_cfg.num_channels = cells;
255 cl->rx_cfg.channels = kcalloc(cells, sizeof(channel), GFP_KERNEL);
256 if (!cl->rx_cfg.channels) {
257 err = -ENOMEM;
258 goto err;
259 }
260
261 cl->tx_cfg.channels = kcalloc(cells, sizeof(channel), GFP_KERNEL);
262 if (!cl->tx_cfg.channels) {
263 err = -ENOMEM;
264 goto err2;
265 }
266
267 max_chan = 0;
268 for (i = 0; i < cells; i++) {
269 err = of_property_read_u32_index(client, "hsi-channel-ids", i,
270 &channel.id);
271 if (err)
272 goto err3;
273
274 err = of_property_read_string_index(client, "hsi-channel-names",
275 i, &channel.name);
276 if (err)
277 channel.name = NULL;
278
279 if (channel.id > max_chan)
280 max_chan = channel.id;
281
282 cl->rx_cfg.channels[i] = channel;
283 cl->tx_cfg.channels[i] = channel;
284 }
285
286 cl->rx_cfg.num_hw_channels = max_chan + 1;
287 cl->tx_cfg.num_hw_channels = max_chan + 1;
288
289 cl->device.bus = &hsi_bus_type;
290 cl->device.parent = &port->device;
291 cl->device.release = hsi_client_release;
292 cl->device.of_node = client;
293
294 dev_set_name(&cl->device, "%s", name);
295 if (device_register(&cl->device) < 0) {
296 pr_err("hsi: failed to register client: %s\n", name);
297 put_device(&cl->device);
298 }
299
300 return;
301
302err3:
303 kfree(cl->tx_cfg.channels);
304err2:
305 kfree(cl->rx_cfg.channels);
306err:
307 kfree(cl);
308 pr_err("hsi client: missing or incorrect of property: err=%d\n", err);
309}
310
311void hsi_add_clients_from_dt(struct hsi_port *port, struct device_node *clients)
312{
313 struct device_node *child;
314
315
316 hsi_new_client(port, &hsi_char_dev_info);
317
318 for_each_available_child_of_node(clients, child)
319 hsi_add_client_from_dt(port, child);
320}
321EXPORT_SYMBOL_GPL(hsi_add_clients_from_dt);
322#endif
323
324int hsi_remove_client(struct device *dev, void *data __maybe_unused)
325{
326 device_unregister(dev);
327
328 return 0;
329}
330EXPORT_SYMBOL_GPL(hsi_remove_client);
331
332static int hsi_remove_port(struct device *dev, void *data __maybe_unused)
333{
334 device_for_each_child(dev, NULL, hsi_remove_client);
335 device_unregister(dev);
336
337 return 0;
338}
339
340static void hsi_controller_release(struct device *dev)
341{
342 struct hsi_controller *hsi = to_hsi_controller(dev);
343
344 kfree(hsi->port);
345 kfree(hsi);
346}
347
348static void hsi_port_release(struct device *dev)
349{
350 kfree(to_hsi_port(dev));
351}
352
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356
357void hsi_port_unregister_clients(struct hsi_port *port)
358{
359 device_for_each_child(&port->device, NULL, hsi_remove_client);
360}
361EXPORT_SYMBOL_GPL(hsi_port_unregister_clients);
362
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365
366
367void hsi_unregister_controller(struct hsi_controller *hsi)
368{
369 device_for_each_child(&hsi->device, NULL, hsi_remove_port);
370 device_unregister(&hsi->device);
371}
372EXPORT_SYMBOL_GPL(hsi_unregister_controller);
373
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379
380int hsi_register_controller(struct hsi_controller *hsi)
381{
382 unsigned int i;
383 int err;
384
385 err = device_add(&hsi->device);
386 if (err < 0)
387 return err;
388 for (i = 0; i < hsi->num_ports; i++) {
389 hsi->port[i]->device.parent = &hsi->device;
390 err = device_add(&hsi->port[i]->device);
391 if (err < 0)
392 goto out;
393 }
394
395 hsi_scan_board_info(hsi);
396
397 return 0;
398out:
399 while (i-- > 0)
400 device_del(&hsi->port[i]->device);
401 device_del(&hsi->device);
402
403 return err;
404}
405EXPORT_SYMBOL_GPL(hsi_register_controller);
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413int hsi_register_client_driver(struct hsi_client_driver *drv)
414{
415 drv->driver.bus = &hsi_bus_type;
416
417 return driver_register(&drv->driver);
418}
419EXPORT_SYMBOL_GPL(hsi_register_client_driver);
420
421static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused)
422{
423 return 0;
424}
425
426static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused)
427{
428 return 0;
429}
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439
440void hsi_put_controller(struct hsi_controller *hsi)
441{
442 unsigned int i;
443
444 if (!hsi)
445 return;
446
447 for (i = 0; i < hsi->num_ports; i++)
448 if (hsi->port && hsi->port[i])
449 put_device(&hsi->port[i]->device);
450 put_device(&hsi->device);
451}
452EXPORT_SYMBOL_GPL(hsi_put_controller);
453
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460
461struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags)
462{
463 struct hsi_controller *hsi;
464 struct hsi_port **port;
465 unsigned int i;
466
467 if (!n_ports)
468 return NULL;
469
470 hsi = kzalloc(sizeof(*hsi), flags);
471 if (!hsi)
472 return NULL;
473 port = kcalloc(n_ports, sizeof(*port), flags);
474 if (!port) {
475 kfree(hsi);
476 return NULL;
477 }
478 hsi->num_ports = n_ports;
479 hsi->port = port;
480 hsi->device.release = hsi_controller_release;
481 device_initialize(&hsi->device);
482
483 for (i = 0; i < n_ports; i++) {
484 port[i] = kzalloc(sizeof(**port), flags);
485 if (port[i] == NULL)
486 goto out;
487 port[i]->num = i;
488 port[i]->async = hsi_dummy_msg;
489 port[i]->setup = hsi_dummy_cl;
490 port[i]->flush = hsi_dummy_cl;
491 port[i]->start_tx = hsi_dummy_cl;
492 port[i]->stop_tx = hsi_dummy_cl;
493 port[i]->release = hsi_dummy_cl;
494 mutex_init(&port[i]->lock);
495 BLOCKING_INIT_NOTIFIER_HEAD(&port[i]->n_head);
496 dev_set_name(&port[i]->device, "port%d", i);
497 hsi->port[i]->device.release = hsi_port_release;
498 device_initialize(&hsi->port[i]->device);
499 }
500
501 return hsi;
502out:
503 hsi_put_controller(hsi);
504
505 return NULL;
506}
507EXPORT_SYMBOL_GPL(hsi_alloc_controller);
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514
515void hsi_free_msg(struct hsi_msg *msg)
516{
517 if (!msg)
518 return;
519 sg_free_table(&msg->sgt);
520 kfree(msg);
521}
522EXPORT_SYMBOL_GPL(hsi_free_msg);
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535struct hsi_msg *hsi_alloc_msg(unsigned int nents, gfp_t flags)
536{
537 struct hsi_msg *msg;
538 int err;
539
540 msg = kzalloc(sizeof(*msg), flags);
541 if (!msg)
542 return NULL;
543
544 if (!nents)
545 return msg;
546
547 err = sg_alloc_table(&msg->sgt, nents, flags);
548 if (unlikely(err)) {
549 kfree(msg);
550 msg = NULL;
551 }
552
553 return msg;
554}
555EXPORT_SYMBOL_GPL(hsi_alloc_msg);
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576int hsi_async(struct hsi_client *cl, struct hsi_msg *msg)
577{
578 struct hsi_port *port = hsi_get_port(cl);
579
580 if (!hsi_port_claimed(cl))
581 return -EACCES;
582
583 WARN_ON_ONCE(!msg->destructor || !msg->complete);
584 msg->cl = cl;
585
586 return port->async(msg);
587}
588EXPORT_SYMBOL_GPL(hsi_async);
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597int hsi_claim_port(struct hsi_client *cl, unsigned int share)
598{
599 struct hsi_port *port = hsi_get_port(cl);
600 int err = 0;
601
602 mutex_lock(&port->lock);
603 if ((port->claimed) && (!port->shared || !share)) {
604 err = -EBUSY;
605 goto out;
606 }
607 if (!try_module_get(to_hsi_controller(port->device.parent)->owner)) {
608 err = -ENODEV;
609 goto out;
610 }
611 port->claimed++;
612 port->shared = !!share;
613 cl->pclaimed = 1;
614out:
615 mutex_unlock(&port->lock);
616
617 return err;
618}
619EXPORT_SYMBOL_GPL(hsi_claim_port);
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624
625void hsi_release_port(struct hsi_client *cl)
626{
627 struct hsi_port *port = hsi_get_port(cl);
628
629 mutex_lock(&port->lock);
630
631 port->release(cl);
632 if (cl->pclaimed)
633 port->claimed--;
634 BUG_ON(port->claimed < 0);
635 cl->pclaimed = 0;
636 if (!port->claimed)
637 port->shared = 0;
638 module_put(to_hsi_controller(port->device.parent)->owner);
639 mutex_unlock(&port->lock);
640}
641EXPORT_SYMBOL_GPL(hsi_release_port);
642
643static int hsi_event_notifier_call(struct notifier_block *nb,
644 unsigned long event, void *data __maybe_unused)
645{
646 struct hsi_client *cl = container_of(nb, struct hsi_client, nb);
647
648 (*cl->ehandler)(cl, event);
649
650 return 0;
651}
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664
665int hsi_register_port_event(struct hsi_client *cl,
666 void (*handler)(struct hsi_client *, unsigned long))
667{
668 struct hsi_port *port = hsi_get_port(cl);
669
670 if (!handler || cl->ehandler)
671 return -EINVAL;
672 if (!hsi_port_claimed(cl))
673 return -EACCES;
674 cl->ehandler = handler;
675 cl->nb.notifier_call = hsi_event_notifier_call;
676
677 return blocking_notifier_chain_register(&port->n_head, &cl->nb);
678}
679EXPORT_SYMBOL_GPL(hsi_register_port_event);
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690int hsi_unregister_port_event(struct hsi_client *cl)
691{
692 struct hsi_port *port = hsi_get_port(cl);
693 int err;
694
695 WARN_ON(!hsi_port_claimed(cl));
696
697 err = blocking_notifier_chain_unregister(&port->n_head, &cl->nb);
698 if (!err)
699 cl->ehandler = NULL;
700
701 return err;
702}
703EXPORT_SYMBOL_GPL(hsi_unregister_port_event);
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720int hsi_event(struct hsi_port *port, unsigned long event)
721{
722 return blocking_notifier_call_chain(&port->n_head, event, NULL);
723}
724EXPORT_SYMBOL_GPL(hsi_event);
725
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736
737int hsi_get_channel_id_by_name(struct hsi_client *cl, char *name)
738{
739 int i;
740
741 if (!cl->rx_cfg.channels)
742 return -ENOENT;
743
744 for (i = 0; i < cl->rx_cfg.num_channels; i++)
745 if (!strcmp(cl->rx_cfg.channels[i].name, name))
746 return cl->rx_cfg.channels[i].id;
747
748 return -ENXIO;
749}
750EXPORT_SYMBOL_GPL(hsi_get_channel_id_by_name);
751
752static int __init hsi_init(void)
753{
754 return bus_register(&hsi_bus_type);
755}
756postcore_initcall(hsi_init);
757
758static void __exit hsi_exit(void)
759{
760 bus_unregister(&hsi_bus_type);
761}
762module_exit(hsi_exit);
763
764MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
765MODULE_DESCRIPTION("High-speed Synchronous Serial Interface (HSI) framework");
766MODULE_LICENSE("GPL v2");
767