1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * c67x00-sched.c: Cypress C67X00 USB Host Controller Driver - TD scheduling |
4 | * |
5 | * Copyright (C) 2006-2008 Barco N.V. |
6 | * Derived from the Cypress cy7c67200/300 ezusb linux driver and |
7 | * based on multiple host controller drivers inside the linux kernel. |
8 | */ |
9 | |
10 | #include <linux/kthread.h> |
11 | #include <linux/slab.h> |
12 | |
13 | #include "c67x00.h" |
14 | #include "c67x00-hcd.h" |
15 | |
16 | /* |
17 | * These are the stages for a control urb, they are kept |
18 | * in both urb->interval and td->privdata. |
19 | */ |
20 | #define SETUP_STAGE 0 |
21 | #define DATA_STAGE 1 |
22 | #define STATUS_STAGE 2 |
23 | |
24 | /* -------------------------------------------------------------------------- */ |
25 | |
26 | /* |
27 | * struct c67x00_ep_data: Host endpoint data structure |
28 | */ |
29 | struct c67x00_ep_data { |
30 | struct list_head queue; |
31 | struct list_head node; |
32 | struct usb_host_endpoint *hep; |
33 | struct usb_device *dev; |
34 | u16 next_frame; /* For int/isoc transactions */ |
35 | }; |
36 | |
37 | /* |
38 | * struct c67x00_td |
39 | * |
40 | * Hardware parts are little endiannes, SW in CPU endianess. |
41 | */ |
42 | struct c67x00_td { |
43 | /* HW specific part */ |
44 | __le16 ly_base_addr; /* Bytes 0-1 */ |
45 | __le16 port_length; /* Bytes 2-3 */ |
46 | u8 pid_ep; /* Byte 4 */ |
47 | u8 dev_addr; /* Byte 5 */ |
48 | u8 ctrl_reg; /* Byte 6 */ |
49 | u8 status; /* Byte 7 */ |
50 | u8 retry_cnt; /* Byte 8 */ |
51 | #define TT_OFFSET 2 |
52 | #define TT_CONTROL 0 |
53 | #define TT_ISOCHRONOUS 1 |
54 | #define TT_BULK 2 |
55 | #define TT_INTERRUPT 3 |
56 | u8 residue; /* Byte 9 */ |
57 | __le16 next_td_addr; /* Bytes 10-11 */ |
58 | /* SW part */ |
59 | struct list_head td_list; |
60 | u16 td_addr; |
61 | void *data; |
62 | struct urb *urb; |
63 | unsigned long privdata; |
64 | |
65 | /* These are needed for handling the toggle bits: |
66 | * an urb can be dequeued while a td is in progress |
67 | * after checking the td, the toggle bit might need to |
68 | * be fixed */ |
69 | struct c67x00_ep_data *ep_data; |
70 | unsigned int pipe; |
71 | }; |
72 | |
73 | struct c67x00_urb_priv { |
74 | struct list_head hep_node; |
75 | struct urb *urb; |
76 | int port; |
77 | int cnt; /* packet number for isoc */ |
78 | int status; |
79 | struct c67x00_ep_data *ep_data; |
80 | }; |
81 | |
82 | #define td_udev(td) ((td)->ep_data->dev) |
83 | |
84 | #define CY_TD_SIZE 12 |
85 | |
86 | #define TD_PIDEP_OFFSET 0x04 |
87 | #define TD_PIDEPMASK_PID 0xF0 |
88 | #define TD_PIDEPMASK_EP 0x0F |
89 | #define TD_PORTLENMASK_DL 0x03FF |
90 | #define TD_PORTLENMASK_PN 0xC000 |
91 | |
92 | #define TD_STATUS_OFFSET 0x07 |
93 | #define TD_STATUSMASK_ACK 0x01 |
94 | #define TD_STATUSMASK_ERR 0x02 |
95 | #define TD_STATUSMASK_TMOUT 0x04 |
96 | #define TD_STATUSMASK_SEQ 0x08 |
97 | #define TD_STATUSMASK_SETUP 0x10 |
98 | #define TD_STATUSMASK_OVF 0x20 |
99 | #define TD_STATUSMASK_NAK 0x40 |
100 | #define TD_STATUSMASK_STALL 0x80 |
101 | |
102 | #define TD_ERROR_MASK (TD_STATUSMASK_ERR | TD_STATUSMASK_TMOUT | \ |
103 | TD_STATUSMASK_STALL) |
104 | |
105 | #define TD_RETRYCNT_OFFSET 0x08 |
106 | #define TD_RETRYCNTMASK_ACT_FLG 0x10 |
107 | #define TD_RETRYCNTMASK_TX_TYPE 0x0C |
108 | #define TD_RETRYCNTMASK_RTY_CNT 0x03 |
109 | |
110 | #define TD_RESIDUE_OVERFLOW 0x80 |
111 | |
112 | #define TD_PID_IN 0x90 |
113 | |
114 | /* Residue: signed 8bits, neg -> OVERFLOW, pos -> UNDERFLOW */ |
115 | #define td_residue(td) ((__s8)(td->residue)) |
116 | #define td_ly_base_addr(td) (__le16_to_cpu((td)->ly_base_addr)) |
117 | #define td_port_length(td) (__le16_to_cpu((td)->port_length)) |
118 | #define td_next_td_addr(td) (__le16_to_cpu((td)->next_td_addr)) |
119 | |
120 | #define td_active(td) ((td)->retry_cnt & TD_RETRYCNTMASK_ACT_FLG) |
121 | #define td_length(td) (td_port_length(td) & TD_PORTLENMASK_DL) |
122 | |
123 | #define td_sequence_ok(td) (!td->status || \ |
124 | (!(td->status & TD_STATUSMASK_SEQ) == \ |
125 | !(td->ctrl_reg & SEQ_SEL))) |
126 | |
127 | #define td_acked(td) (!td->status || \ |
128 | (td->status & TD_STATUSMASK_ACK)) |
129 | #define td_actual_bytes(td) (td_length(td) - td_residue(td)) |
130 | |
131 | /* -------------------------------------------------------------------------- */ |
132 | |
133 | /* |
134 | * dbg_td - Dump the contents of the TD |
135 | */ |
136 | static void dbg_td(struct c67x00_hcd *c67x00, struct c67x00_td *td, char *msg) |
137 | { |
138 | struct device *dev = c67x00_hcd_dev(c67x00); |
139 | |
140 | dev_dbg(dev, "### %s at 0x%04x\n" , msg, td->td_addr); |
141 | dev_dbg(dev, "urb: 0x%p\n" , td->urb); |
142 | dev_dbg(dev, "endpoint: %4d\n" , usb_pipeendpoint(td->pipe)); |
143 | dev_dbg(dev, "pipeout: %4d\n" , usb_pipeout(td->pipe)); |
144 | dev_dbg(dev, "ly_base_addr: 0x%04x\n" , td_ly_base_addr(td)); |
145 | dev_dbg(dev, "port_length: 0x%04x\n" , td_port_length(td)); |
146 | dev_dbg(dev, "pid_ep: 0x%02x\n" , td->pid_ep); |
147 | dev_dbg(dev, "dev_addr: 0x%02x\n" , td->dev_addr); |
148 | dev_dbg(dev, "ctrl_reg: 0x%02x\n" , td->ctrl_reg); |
149 | dev_dbg(dev, "status: 0x%02x\n" , td->status); |
150 | dev_dbg(dev, "retry_cnt: 0x%02x\n" , td->retry_cnt); |
151 | dev_dbg(dev, "residue: 0x%02x\n" , td->residue); |
152 | dev_dbg(dev, "next_td_addr: 0x%04x\n" , td_next_td_addr(td)); |
153 | dev_dbg(dev, "data: %*ph\n" , td_length(td), td->data); |
154 | } |
155 | |
156 | /* -------------------------------------------------------------------------- */ |
157 | /* Helper functions */ |
158 | |
159 | static inline u16 c67x00_get_current_frame_number(struct c67x00_hcd *c67x00) |
160 | { |
161 | return c67x00_ll_husb_get_frame(sie: c67x00->sie) & HOST_FRAME_MASK; |
162 | } |
163 | |
164 | /* |
165 | * frame_add |
166 | * Software wraparound for framenumbers. |
167 | */ |
168 | static inline u16 frame_add(u16 a, u16 b) |
169 | { |
170 | return (a + b) & HOST_FRAME_MASK; |
171 | } |
172 | |
173 | /* |
174 | * frame_after - is frame a after frame b |
175 | */ |
176 | static inline int frame_after(u16 a, u16 b) |
177 | { |
178 | return ((HOST_FRAME_MASK + a - b) & HOST_FRAME_MASK) < |
179 | (HOST_FRAME_MASK / 2); |
180 | } |
181 | |
182 | /* |
183 | * frame_after_eq - is frame a after or equal to frame b |
184 | */ |
185 | static inline int frame_after_eq(u16 a, u16 b) |
186 | { |
187 | return ((HOST_FRAME_MASK + 1 + a - b) & HOST_FRAME_MASK) < |
188 | (HOST_FRAME_MASK / 2); |
189 | } |
190 | |
191 | /* -------------------------------------------------------------------------- */ |
192 | |
193 | /* |
194 | * c67x00_release_urb - remove link from all tds to this urb |
195 | * Disconnects the urb from it's tds, so that it can be given back. |
196 | * pre: urb->hcpriv != NULL |
197 | */ |
198 | static void c67x00_release_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
199 | { |
200 | struct c67x00_td *td; |
201 | struct c67x00_urb_priv *urbp; |
202 | |
203 | BUG_ON(!urb); |
204 | |
205 | c67x00->urb_count--; |
206 | |
207 | if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { |
208 | c67x00->urb_iso_count--; |
209 | if (c67x00->urb_iso_count == 0) |
210 | c67x00->max_frame_bw = MAX_FRAME_BW_STD; |
211 | } |
212 | |
213 | /* TODO this might be not so efficient when we've got many urbs! |
214 | * Alternatives: |
215 | * * only clear when needed |
216 | * * keep a list of tds with each urbp |
217 | */ |
218 | list_for_each_entry(td, &c67x00->td_list, td_list) |
219 | if (urb == td->urb) |
220 | td->urb = NULL; |
221 | |
222 | urbp = urb->hcpriv; |
223 | urb->hcpriv = NULL; |
224 | list_del(entry: &urbp->hep_node); |
225 | kfree(objp: urbp); |
226 | } |
227 | |
228 | /* -------------------------------------------------------------------------- */ |
229 | |
230 | static struct c67x00_ep_data * |
231 | c67x00_ep_data_alloc(struct c67x00_hcd *c67x00, struct urb *urb) |
232 | { |
233 | struct usb_host_endpoint *hep = urb->ep; |
234 | struct c67x00_ep_data *ep_data; |
235 | int type; |
236 | |
237 | c67x00->current_frame = c67x00_get_current_frame_number(c67x00); |
238 | |
239 | /* Check if endpoint already has a c67x00_ep_data struct allocated */ |
240 | if (hep->hcpriv) { |
241 | ep_data = hep->hcpriv; |
242 | if (frame_after(a: c67x00->current_frame, b: ep_data->next_frame)) |
243 | ep_data->next_frame = |
244 | frame_add(a: c67x00->current_frame, b: 1); |
245 | return hep->hcpriv; |
246 | } |
247 | |
248 | /* Allocate and initialize a new c67x00 endpoint data structure */ |
249 | ep_data = kzalloc(size: sizeof(*ep_data), GFP_ATOMIC); |
250 | if (!ep_data) |
251 | return NULL; |
252 | |
253 | INIT_LIST_HEAD(list: &ep_data->queue); |
254 | INIT_LIST_HEAD(list: &ep_data->node); |
255 | ep_data->hep = hep; |
256 | |
257 | /* hold a reference to udev as long as this endpoint lives, |
258 | * this is needed to possibly fix the data toggle */ |
259 | ep_data->dev = usb_get_dev(dev: urb->dev); |
260 | hep->hcpriv = ep_data; |
261 | |
262 | /* For ISOC and INT endpoints, start ASAP: */ |
263 | ep_data->next_frame = frame_add(a: c67x00->current_frame, b: 1); |
264 | |
265 | /* Add the endpoint data to one of the pipe lists; must be added |
266 | in order of endpoint address */ |
267 | type = usb_pipetype(urb->pipe); |
268 | if (list_empty(head: &ep_data->node)) { |
269 | list_add(new: &ep_data->node, head: &c67x00->list[type]); |
270 | } else { |
271 | struct c67x00_ep_data *prev; |
272 | |
273 | list_for_each_entry(prev, &c67x00->list[type], node) { |
274 | if (prev->hep->desc.bEndpointAddress > |
275 | hep->desc.bEndpointAddress) { |
276 | list_add(new: &ep_data->node, head: prev->node.prev); |
277 | break; |
278 | } |
279 | } |
280 | } |
281 | |
282 | return ep_data; |
283 | } |
284 | |
285 | static int c67x00_ep_data_free(struct usb_host_endpoint *hep) |
286 | { |
287 | struct c67x00_ep_data *ep_data = hep->hcpriv; |
288 | |
289 | if (!ep_data) |
290 | return 0; |
291 | |
292 | if (!list_empty(head: &ep_data->queue)) |
293 | return -EBUSY; |
294 | |
295 | usb_put_dev(dev: ep_data->dev); |
296 | list_del(entry: &ep_data->queue); |
297 | list_del(entry: &ep_data->node); |
298 | |
299 | kfree(objp: ep_data); |
300 | hep->hcpriv = NULL; |
301 | |
302 | return 0; |
303 | } |
304 | |
305 | void c67x00_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep) |
306 | { |
307 | struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd); |
308 | unsigned long flags; |
309 | |
310 | if (!list_empty(head: &ep->urb_list)) |
311 | dev_warn(c67x00_hcd_dev(c67x00), "error: urb list not empty\n" ); |
312 | |
313 | spin_lock_irqsave(&c67x00->lock, flags); |
314 | |
315 | /* loop waiting for all transfers in the endpoint queue to complete */ |
316 | while (c67x00_ep_data_free(hep: ep)) { |
317 | /* Drop the lock so we can sleep waiting for the hardware */ |
318 | spin_unlock_irqrestore(lock: &c67x00->lock, flags); |
319 | |
320 | /* it could happen that we reinitialize this completion, while |
321 | * somebody was waiting for that completion. The timeout and |
322 | * while loop handle such cases, but this might be improved */ |
323 | reinit_completion(x: &c67x00->endpoint_disable); |
324 | c67x00_sched_kick(c67x00); |
325 | wait_for_completion_timeout(x: &c67x00->endpoint_disable, timeout: 1 * HZ); |
326 | |
327 | spin_lock_irqsave(&c67x00->lock, flags); |
328 | } |
329 | |
330 | spin_unlock_irqrestore(lock: &c67x00->lock, flags); |
331 | } |
332 | |
333 | /* -------------------------------------------------------------------------- */ |
334 | |
335 | static inline int get_root_port(struct usb_device *dev) |
336 | { |
337 | while (dev->parent->parent) |
338 | dev = dev->parent; |
339 | return dev->portnum; |
340 | } |
341 | |
342 | int c67x00_urb_enqueue(struct usb_hcd *hcd, |
343 | struct urb *urb, gfp_t mem_flags) |
344 | { |
345 | int ret; |
346 | unsigned long flags; |
347 | struct c67x00_urb_priv *urbp; |
348 | struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd); |
349 | int port = get_root_port(dev: urb->dev)-1; |
350 | |
351 | /* Allocate and initialize urb private data */ |
352 | urbp = kzalloc(size: sizeof(*urbp), flags: mem_flags); |
353 | if (!urbp) { |
354 | ret = -ENOMEM; |
355 | goto err_urbp; |
356 | } |
357 | |
358 | spin_lock_irqsave(&c67x00->lock, flags); |
359 | |
360 | /* Make sure host controller is running */ |
361 | if (!HC_IS_RUNNING(hcd->state)) { |
362 | ret = -ENODEV; |
363 | goto err_not_linked; |
364 | } |
365 | |
366 | ret = usb_hcd_link_urb_to_ep(hcd, urb); |
367 | if (ret) |
368 | goto err_not_linked; |
369 | |
370 | INIT_LIST_HEAD(list: &urbp->hep_node); |
371 | urbp->urb = urb; |
372 | urbp->port = port; |
373 | |
374 | urbp->ep_data = c67x00_ep_data_alloc(c67x00, urb); |
375 | |
376 | if (!urbp->ep_data) { |
377 | ret = -ENOMEM; |
378 | goto err_epdata; |
379 | } |
380 | |
381 | /* TODO claim bandwidth with usb_claim_bandwidth? |
382 | * also release it somewhere! */ |
383 | |
384 | urb->hcpriv = urbp; |
385 | |
386 | urb->actual_length = 0; /* Nothing received/transmitted yet */ |
387 | |
388 | switch (usb_pipetype(urb->pipe)) { |
389 | case PIPE_CONTROL: |
390 | urb->interval = SETUP_STAGE; |
391 | break; |
392 | case PIPE_INTERRUPT: |
393 | break; |
394 | case PIPE_BULK: |
395 | break; |
396 | case PIPE_ISOCHRONOUS: |
397 | if (c67x00->urb_iso_count == 0) |
398 | c67x00->max_frame_bw = MAX_FRAME_BW_ISO; |
399 | c67x00->urb_iso_count++; |
400 | /* Assume always URB_ISO_ASAP, FIXME */ |
401 | if (list_empty(head: &urbp->ep_data->queue)) |
402 | urb->start_frame = urbp->ep_data->next_frame; |
403 | else { |
404 | /* Go right after the last one */ |
405 | struct urb *last_urb; |
406 | |
407 | last_urb = list_entry(urbp->ep_data->queue.prev, |
408 | struct c67x00_urb_priv, |
409 | hep_node)->urb; |
410 | urb->start_frame = |
411 | frame_add(a: last_urb->start_frame, |
412 | b: last_urb->number_of_packets * |
413 | last_urb->interval); |
414 | } |
415 | urbp->cnt = 0; |
416 | break; |
417 | } |
418 | |
419 | /* Add the URB to the endpoint queue */ |
420 | list_add_tail(new: &urbp->hep_node, head: &urbp->ep_data->queue); |
421 | |
422 | /* If this is the only URB, kick start the controller */ |
423 | if (!c67x00->urb_count++) |
424 | c67x00_ll_hpi_enable_sofeop(sie: c67x00->sie); |
425 | |
426 | c67x00_sched_kick(c67x00); |
427 | spin_unlock_irqrestore(lock: &c67x00->lock, flags); |
428 | |
429 | return 0; |
430 | |
431 | err_epdata: |
432 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
433 | err_not_linked: |
434 | spin_unlock_irqrestore(lock: &c67x00->lock, flags); |
435 | kfree(objp: urbp); |
436 | err_urbp: |
437 | |
438 | return ret; |
439 | } |
440 | |
441 | int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) |
442 | { |
443 | struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd); |
444 | unsigned long flags; |
445 | int rc; |
446 | |
447 | spin_lock_irqsave(&c67x00->lock, flags); |
448 | rc = usb_hcd_check_unlink_urb(hcd, urb, status); |
449 | if (rc) |
450 | goto done; |
451 | |
452 | c67x00_release_urb(c67x00, urb); |
453 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
454 | |
455 | spin_unlock(lock: &c67x00->lock); |
456 | usb_hcd_giveback_urb(hcd, urb, status); |
457 | spin_lock(lock: &c67x00->lock); |
458 | |
459 | spin_unlock_irqrestore(lock: &c67x00->lock, flags); |
460 | |
461 | return 0; |
462 | |
463 | done: |
464 | spin_unlock_irqrestore(lock: &c67x00->lock, flags); |
465 | return rc; |
466 | } |
467 | |
468 | /* -------------------------------------------------------------------------- */ |
469 | |
470 | /* |
471 | * pre: c67x00 locked, urb unlocked |
472 | */ |
473 | static void |
474 | c67x00_giveback_urb(struct c67x00_hcd *c67x00, struct urb *urb, int status) |
475 | { |
476 | struct c67x00_urb_priv *urbp; |
477 | |
478 | if (!urb) |
479 | return; |
480 | |
481 | urbp = urb->hcpriv; |
482 | urbp->status = status; |
483 | |
484 | list_del_init(entry: &urbp->hep_node); |
485 | |
486 | c67x00_release_urb(c67x00, urb); |
487 | usb_hcd_unlink_urb_from_ep(hcd: c67x00_hcd_to_hcd(c67x00), urb); |
488 | spin_unlock(lock: &c67x00->lock); |
489 | usb_hcd_giveback_urb(hcd: c67x00_hcd_to_hcd(c67x00), urb, status); |
490 | spin_lock(lock: &c67x00->lock); |
491 | } |
492 | |
493 | /* -------------------------------------------------------------------------- */ |
494 | |
495 | static int c67x00_claim_frame_bw(struct c67x00_hcd *c67x00, struct urb *urb, |
496 | int len, int periodic) |
497 | { |
498 | struct c67x00_urb_priv *urbp = urb->hcpriv; |
499 | int bit_time; |
500 | |
501 | /* According to the C67x00 BIOS user manual, page 3-18,19, the |
502 | * following calculations provide the full speed bit times for |
503 | * a transaction. |
504 | * |
505 | * FS(in) = 112.5 + 9.36*BC + HOST_DELAY |
506 | * FS(in,iso) = 90.5 + 9.36*BC + HOST_DELAY |
507 | * FS(out) = 112.5 + 9.36*BC + HOST_DELAY |
508 | * FS(out,iso) = 78.4 + 9.36*BC + HOST_DELAY |
509 | * LS(in) = 802.4 + 75.78*BC + HOST_DELAY |
510 | * LS(out) = 802.6 + 74.67*BC + HOST_DELAY |
511 | * |
512 | * HOST_DELAY == 106 for the c67200 and c67300. |
513 | */ |
514 | |
515 | /* make calculations in 1/100 bit times to maintain resolution */ |
516 | if (urbp->ep_data->dev->speed == USB_SPEED_LOW) { |
517 | /* Low speed pipe */ |
518 | if (usb_pipein(urb->pipe)) |
519 | bit_time = 80240 + 7578*len; |
520 | else |
521 | bit_time = 80260 + 7467*len; |
522 | } else { |
523 | /* FS pipes */ |
524 | if (usb_pipeisoc(urb->pipe)) |
525 | bit_time = usb_pipein(urb->pipe) ? 9050 : 7840; |
526 | else |
527 | bit_time = 11250; |
528 | bit_time += 936*len; |
529 | } |
530 | |
531 | /* Scale back down to integer bit times. Use a host delay of 106. |
532 | * (this is the only place it is used) */ |
533 | bit_time = ((bit_time+50) / 100) + 106; |
534 | |
535 | if (unlikely(bit_time + c67x00->bandwidth_allocated >= |
536 | c67x00->max_frame_bw)) |
537 | return -EMSGSIZE; |
538 | |
539 | if (unlikely(c67x00->next_td_addr + CY_TD_SIZE >= |
540 | c67x00->td_base_addr + SIE_TD_SIZE)) |
541 | return -EMSGSIZE; |
542 | |
543 | if (unlikely(c67x00->next_buf_addr + len >= |
544 | c67x00->buf_base_addr + SIE_TD_BUF_SIZE)) |
545 | return -EMSGSIZE; |
546 | |
547 | if (periodic) { |
548 | if (unlikely(bit_time + c67x00->periodic_bw_allocated >= |
549 | MAX_PERIODIC_BW(c67x00->max_frame_bw))) |
550 | return -EMSGSIZE; |
551 | c67x00->periodic_bw_allocated += bit_time; |
552 | } |
553 | |
554 | c67x00->bandwidth_allocated += bit_time; |
555 | return 0; |
556 | } |
557 | |
558 | /* -------------------------------------------------------------------------- */ |
559 | |
560 | /* |
561 | * td_addr and buf_addr must be word aligned |
562 | */ |
563 | static int c67x00_create_td(struct c67x00_hcd *c67x00, struct urb *urb, |
564 | void *data, int len, int pid, int toggle, |
565 | unsigned long privdata) |
566 | { |
567 | struct c67x00_td *td; |
568 | struct c67x00_urb_priv *urbp = urb->hcpriv; |
569 | const __u8 active_flag = 1, retry_cnt = 3; |
570 | __u8 cmd = 0; |
571 | int tt = 0; |
572 | |
573 | if (c67x00_claim_frame_bw(c67x00, urb, len, usb_pipeisoc(urb->pipe) |
574 | || usb_pipeint(urb->pipe))) |
575 | return -EMSGSIZE; /* Not really an error, but expected */ |
576 | |
577 | td = kzalloc(size: sizeof(*td), GFP_ATOMIC); |
578 | if (!td) |
579 | return -ENOMEM; |
580 | |
581 | td->pipe = urb->pipe; |
582 | td->ep_data = urbp->ep_data; |
583 | |
584 | if ((td_udev(td)->speed == USB_SPEED_LOW) && |
585 | !(c67x00->low_speed_ports & (1 << urbp->port))) |
586 | cmd |= PREAMBLE_EN; |
587 | |
588 | switch (usb_pipetype(td->pipe)) { |
589 | case PIPE_ISOCHRONOUS: |
590 | tt = TT_ISOCHRONOUS; |
591 | cmd |= ISO_EN; |
592 | break; |
593 | case PIPE_CONTROL: |
594 | tt = TT_CONTROL; |
595 | break; |
596 | case PIPE_BULK: |
597 | tt = TT_BULK; |
598 | break; |
599 | case PIPE_INTERRUPT: |
600 | tt = TT_INTERRUPT; |
601 | break; |
602 | } |
603 | |
604 | if (toggle) |
605 | cmd |= SEQ_SEL; |
606 | |
607 | cmd |= ARM_EN; |
608 | |
609 | /* SW part */ |
610 | td->td_addr = c67x00->next_td_addr; |
611 | c67x00->next_td_addr = c67x00->next_td_addr + CY_TD_SIZE; |
612 | |
613 | /* HW part */ |
614 | td->ly_base_addr = __cpu_to_le16(c67x00->next_buf_addr); |
615 | td->port_length = __cpu_to_le16((c67x00->sie->sie_num << 15) | |
616 | (urbp->port << 14) | (len & 0x3FF)); |
617 | td->pid_ep = ((pid & 0xF) << TD_PIDEP_OFFSET) | |
618 | (usb_pipeendpoint(td->pipe) & 0xF); |
619 | td->dev_addr = usb_pipedevice(td->pipe) & 0x7F; |
620 | td->ctrl_reg = cmd; |
621 | td->status = 0; |
622 | td->retry_cnt = (tt << TT_OFFSET) | (active_flag << 4) | retry_cnt; |
623 | td->residue = 0; |
624 | td->next_td_addr = __cpu_to_le16(c67x00->next_td_addr); |
625 | |
626 | /* SW part */ |
627 | td->data = data; |
628 | td->urb = urb; |
629 | td->privdata = privdata; |
630 | |
631 | c67x00->next_buf_addr += (len + 1) & ~0x01; /* properly align */ |
632 | |
633 | list_add_tail(new: &td->td_list, head: &c67x00->td_list); |
634 | return 0; |
635 | } |
636 | |
637 | static inline void c67x00_release_td(struct c67x00_td *td) |
638 | { |
639 | list_del_init(entry: &td->td_list); |
640 | kfree(objp: td); |
641 | } |
642 | |
643 | /* -------------------------------------------------------------------------- */ |
644 | |
645 | static int c67x00_add_data_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
646 | { |
647 | int remaining; |
648 | int toggle; |
649 | int pid; |
650 | int ret = 0; |
651 | int maxps; |
652 | int need_empty; |
653 | |
654 | toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
655 | usb_pipeout(urb->pipe)); |
656 | remaining = urb->transfer_buffer_length - urb->actual_length; |
657 | |
658 | maxps = usb_maxpacket(udev: urb->dev, pipe: urb->pipe); |
659 | |
660 | need_empty = (urb->transfer_flags & URB_ZERO_PACKET) && |
661 | usb_pipeout(urb->pipe) && !(remaining % maxps); |
662 | |
663 | while (remaining || need_empty) { |
664 | int len; |
665 | char *td_buf; |
666 | |
667 | len = (remaining > maxps) ? maxps : remaining; |
668 | if (!len) |
669 | need_empty = 0; |
670 | |
671 | pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN; |
672 | td_buf = urb->transfer_buffer + urb->transfer_buffer_length - |
673 | remaining; |
674 | ret = c67x00_create_td(c67x00, urb, data: td_buf, len, pid, toggle, |
675 | DATA_STAGE); |
676 | if (ret) |
677 | return ret; /* td wasn't created */ |
678 | |
679 | toggle ^= 1; |
680 | remaining -= len; |
681 | if (usb_pipecontrol(urb->pipe)) |
682 | break; |
683 | } |
684 | |
685 | return 0; |
686 | } |
687 | |
688 | /* |
689 | * return 0 in case more bandwidth is available, else errorcode |
690 | */ |
691 | static int c67x00_add_ctrl_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
692 | { |
693 | int ret; |
694 | int pid; |
695 | |
696 | switch (urb->interval) { |
697 | default: |
698 | case SETUP_STAGE: |
699 | ret = c67x00_create_td(c67x00, urb, data: urb->setup_packet, |
700 | len: 8, USB_PID_SETUP, toggle: 0, SETUP_STAGE); |
701 | if (ret) |
702 | return ret; |
703 | urb->interval = SETUP_STAGE; |
704 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
705 | usb_pipeout(urb->pipe), 1); |
706 | break; |
707 | case DATA_STAGE: |
708 | if (urb->transfer_buffer_length) { |
709 | ret = c67x00_add_data_urb(c67x00, urb); |
710 | if (ret) |
711 | return ret; |
712 | break; |
713 | } |
714 | fallthrough; |
715 | case STATUS_STAGE: |
716 | pid = !usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN; |
717 | ret = c67x00_create_td(c67x00, urb, NULL, len: 0, pid, toggle: 1, |
718 | STATUS_STAGE); |
719 | if (ret) |
720 | return ret; |
721 | break; |
722 | } |
723 | |
724 | return 0; |
725 | } |
726 | |
727 | /* |
728 | * return 0 in case more bandwidth is available, else errorcode |
729 | */ |
730 | static int c67x00_add_int_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
731 | { |
732 | struct c67x00_urb_priv *urbp = urb->hcpriv; |
733 | |
734 | if (frame_after_eq(a: c67x00->current_frame, b: urbp->ep_data->next_frame)) { |
735 | urbp->ep_data->next_frame = |
736 | frame_add(a: urbp->ep_data->next_frame, b: urb->interval); |
737 | return c67x00_add_data_urb(c67x00, urb); |
738 | } |
739 | return 0; |
740 | } |
741 | |
742 | static int c67x00_add_iso_urb(struct c67x00_hcd *c67x00, struct urb *urb) |
743 | { |
744 | struct c67x00_urb_priv *urbp = urb->hcpriv; |
745 | |
746 | if (frame_after_eq(a: c67x00->current_frame, b: urbp->ep_data->next_frame)) { |
747 | char *td_buf; |
748 | int len, pid, ret; |
749 | |
750 | BUG_ON(urbp->cnt >= urb->number_of_packets); |
751 | |
752 | td_buf = urb->transfer_buffer + |
753 | urb->iso_frame_desc[urbp->cnt].offset; |
754 | len = urb->iso_frame_desc[urbp->cnt].length; |
755 | pid = usb_pipeout(urb->pipe) ? USB_PID_OUT : USB_PID_IN; |
756 | |
757 | ret = c67x00_create_td(c67x00, urb, data: td_buf, len, pid, toggle: 0, |
758 | privdata: urbp->cnt); |
759 | if (ret) { |
760 | dev_dbg(c67x00_hcd_dev(c67x00), "create failed: %d\n" , |
761 | ret); |
762 | urb->iso_frame_desc[urbp->cnt].actual_length = 0; |
763 | urb->iso_frame_desc[urbp->cnt].status = ret; |
764 | if (urbp->cnt + 1 == urb->number_of_packets) |
765 | c67x00_giveback_urb(c67x00, urb, status: 0); |
766 | } |
767 | |
768 | urbp->ep_data->next_frame = |
769 | frame_add(a: urbp->ep_data->next_frame, b: urb->interval); |
770 | urbp->cnt++; |
771 | } |
772 | return 0; |
773 | } |
774 | |
775 | /* -------------------------------------------------------------------------- */ |
776 | |
777 | static void c67x00_fill_from_list(struct c67x00_hcd *c67x00, int type, |
778 | int (*add)(struct c67x00_hcd *, struct urb *)) |
779 | { |
780 | struct c67x00_ep_data *ep_data; |
781 | struct urb *urb; |
782 | |
783 | /* traverse every endpoint on the list */ |
784 | list_for_each_entry(ep_data, &c67x00->list[type], node) { |
785 | if (!list_empty(head: &ep_data->queue)) { |
786 | /* and add the first urb */ |
787 | /* isochronous transfer rely on this */ |
788 | urb = list_entry(ep_data->queue.next, |
789 | struct c67x00_urb_priv, |
790 | hep_node)->urb; |
791 | add(c67x00, urb); |
792 | } |
793 | } |
794 | } |
795 | |
796 | static void c67x00_fill_frame(struct c67x00_hcd *c67x00) |
797 | { |
798 | struct c67x00_td *td, *ttd; |
799 | |
800 | /* Check if we can proceed */ |
801 | if (!list_empty(head: &c67x00->td_list)) { |
802 | dev_warn(c67x00_hcd_dev(c67x00), |
803 | "TD list not empty! This should not happen!\n" ); |
804 | list_for_each_entry_safe(td, ttd, &c67x00->td_list, td_list) { |
805 | dbg_td(c67x00, td, msg: "Unprocessed td" ); |
806 | c67x00_release_td(td); |
807 | } |
808 | } |
809 | |
810 | /* Reinitialize variables */ |
811 | c67x00->bandwidth_allocated = 0; |
812 | c67x00->periodic_bw_allocated = 0; |
813 | |
814 | c67x00->next_td_addr = c67x00->td_base_addr; |
815 | c67x00->next_buf_addr = c67x00->buf_base_addr; |
816 | |
817 | /* Fill the list */ |
818 | c67x00_fill_from_list(c67x00, PIPE_ISOCHRONOUS, add: c67x00_add_iso_urb); |
819 | c67x00_fill_from_list(c67x00, PIPE_INTERRUPT, add: c67x00_add_int_urb); |
820 | c67x00_fill_from_list(c67x00, PIPE_CONTROL, add: c67x00_add_ctrl_urb); |
821 | c67x00_fill_from_list(c67x00, PIPE_BULK, add: c67x00_add_data_urb); |
822 | } |
823 | |
824 | /* -------------------------------------------------------------------------- */ |
825 | |
826 | /* |
827 | * Get TD from C67X00 |
828 | */ |
829 | static inline void |
830 | c67x00_parse_td(struct c67x00_hcd *c67x00, struct c67x00_td *td) |
831 | { |
832 | c67x00_ll_read_mem_le16(dev: c67x00->sie->dev, |
833 | addr: td->td_addr, data: td, CY_TD_SIZE); |
834 | |
835 | if (usb_pipein(td->pipe) && td_actual_bytes(td)) |
836 | c67x00_ll_read_mem_le16(dev: c67x00->sie->dev, td_ly_base_addr(td), |
837 | data: td->data, td_actual_bytes(td)); |
838 | } |
839 | |
840 | static int c67x00_td_to_error(struct c67x00_hcd *c67x00, struct c67x00_td *td) |
841 | { |
842 | if (td->status & TD_STATUSMASK_ERR) { |
843 | dbg_td(c67x00, td, msg: "ERROR_FLAG" ); |
844 | return -EILSEQ; |
845 | } |
846 | if (td->status & TD_STATUSMASK_STALL) { |
847 | /* dbg_td(c67x00, td, "STALL"); */ |
848 | return -EPIPE; |
849 | } |
850 | if (td->status & TD_STATUSMASK_TMOUT) { |
851 | dbg_td(c67x00, td, msg: "TIMEOUT" ); |
852 | return -ETIMEDOUT; |
853 | } |
854 | |
855 | return 0; |
856 | } |
857 | |
858 | static inline int c67x00_end_of_data(struct c67x00_td *td) |
859 | { |
860 | int maxps, need_empty, remaining; |
861 | struct urb *urb = td->urb; |
862 | int act_bytes; |
863 | |
864 | act_bytes = td_actual_bytes(td); |
865 | |
866 | if (unlikely(!act_bytes)) |
867 | return 1; /* This was an empty packet */ |
868 | |
869 | maxps = usb_maxpacket(td_udev(td), pipe: td->pipe); |
870 | |
871 | if (unlikely(act_bytes < maxps)) |
872 | return 1; /* Smaller then full packet */ |
873 | |
874 | remaining = urb->transfer_buffer_length - urb->actual_length; |
875 | need_empty = (urb->transfer_flags & URB_ZERO_PACKET) && |
876 | usb_pipeout(urb->pipe) && !(remaining % maxps); |
877 | |
878 | if (unlikely(!remaining && !need_empty)) |
879 | return 1; |
880 | |
881 | return 0; |
882 | } |
883 | |
884 | /* -------------------------------------------------------------------------- */ |
885 | |
886 | /* Remove all td's from the list which come |
887 | * after last_td and are meant for the same pipe. |
888 | * This is used when a short packet has occurred */ |
889 | static inline void c67x00_clear_pipe(struct c67x00_hcd *c67x00, |
890 | struct c67x00_td *last_td) |
891 | { |
892 | struct c67x00_td *td, *tmp; |
893 | td = last_td; |
894 | tmp = last_td; |
895 | while (td->td_list.next != &c67x00->td_list) { |
896 | td = list_entry(td->td_list.next, struct c67x00_td, td_list); |
897 | if (td->pipe == last_td->pipe) { |
898 | c67x00_release_td(td); |
899 | td = tmp; |
900 | } |
901 | tmp = td; |
902 | } |
903 | } |
904 | |
905 | /* -------------------------------------------------------------------------- */ |
906 | |
907 | static void c67x00_handle_successful_td(struct c67x00_hcd *c67x00, |
908 | struct c67x00_td *td) |
909 | { |
910 | struct urb *urb = td->urb; |
911 | |
912 | if (!urb) |
913 | return; |
914 | |
915 | urb->actual_length += td_actual_bytes(td); |
916 | |
917 | switch (usb_pipetype(td->pipe)) { |
918 | /* isochronous tds are handled separately */ |
919 | case PIPE_CONTROL: |
920 | switch (td->privdata) { |
921 | case SETUP_STAGE: |
922 | urb->interval = |
923 | urb->transfer_buffer_length ? |
924 | DATA_STAGE : STATUS_STAGE; |
925 | /* Don't count setup_packet with normal data: */ |
926 | urb->actual_length = 0; |
927 | break; |
928 | |
929 | case DATA_STAGE: |
930 | if (c67x00_end_of_data(td)) { |
931 | urb->interval = STATUS_STAGE; |
932 | c67x00_clear_pipe(c67x00, last_td: td); |
933 | } |
934 | break; |
935 | |
936 | case STATUS_STAGE: |
937 | urb->interval = 0; |
938 | c67x00_giveback_urb(c67x00, urb, status: 0); |
939 | break; |
940 | } |
941 | break; |
942 | |
943 | case PIPE_INTERRUPT: |
944 | case PIPE_BULK: |
945 | if (unlikely(c67x00_end_of_data(td))) { |
946 | c67x00_clear_pipe(c67x00, last_td: td); |
947 | c67x00_giveback_urb(c67x00, urb, status: 0); |
948 | } |
949 | break; |
950 | } |
951 | } |
952 | |
953 | static void c67x00_handle_isoc(struct c67x00_hcd *c67x00, struct c67x00_td *td) |
954 | { |
955 | struct urb *urb = td->urb; |
956 | int cnt; |
957 | |
958 | if (!urb) |
959 | return; |
960 | |
961 | cnt = td->privdata; |
962 | |
963 | if (td->status & TD_ERROR_MASK) |
964 | urb->error_count++; |
965 | |
966 | urb->iso_frame_desc[cnt].actual_length = td_actual_bytes(td); |
967 | urb->iso_frame_desc[cnt].status = c67x00_td_to_error(c67x00, td); |
968 | if (cnt + 1 == urb->number_of_packets) /* Last packet */ |
969 | c67x00_giveback_urb(c67x00, urb, status: 0); |
970 | } |
971 | |
972 | /* -------------------------------------------------------------------------- */ |
973 | |
974 | /* |
975 | * c67x00_check_td_list - handle tds which have been processed by the c67x00 |
976 | * pre: current_td == 0 |
977 | */ |
978 | static inline void c67x00_check_td_list(struct c67x00_hcd *c67x00) |
979 | { |
980 | struct c67x00_td *td, *tmp; |
981 | struct urb *urb; |
982 | int ack_ok; |
983 | int clear_endpoint; |
984 | |
985 | list_for_each_entry_safe(td, tmp, &c67x00->td_list, td_list) { |
986 | /* get the TD */ |
987 | c67x00_parse_td(c67x00, td); |
988 | urb = td->urb; /* urb can be NULL! */ |
989 | ack_ok = 0; |
990 | clear_endpoint = 1; |
991 | |
992 | /* Handle isochronous transfers separately */ |
993 | if (usb_pipeisoc(td->pipe)) { |
994 | clear_endpoint = 0; |
995 | c67x00_handle_isoc(c67x00, td); |
996 | goto cont; |
997 | } |
998 | |
999 | /* When an error occurs, all td's for that pipe go into an |
1000 | * inactive state. This state matches successful transfers so |
1001 | * we must make sure not to service them. */ |
1002 | if (td->status & TD_ERROR_MASK) { |
1003 | c67x00_giveback_urb(c67x00, urb, |
1004 | status: c67x00_td_to_error(c67x00, td)); |
1005 | goto cont; |
1006 | } |
1007 | |
1008 | if ((td->status & TD_STATUSMASK_NAK) || !td_sequence_ok(td) || |
1009 | !td_acked(td)) |
1010 | goto cont; |
1011 | |
1012 | /* Sequence ok and acked, don't need to fix toggle */ |
1013 | ack_ok = 1; |
1014 | |
1015 | if (unlikely(td->status & TD_STATUSMASK_OVF)) { |
1016 | if (td_residue(td) & TD_RESIDUE_OVERFLOW) { |
1017 | /* Overflow */ |
1018 | c67x00_giveback_urb(c67x00, urb, status: -EOVERFLOW); |
1019 | goto cont; |
1020 | } |
1021 | } |
1022 | |
1023 | clear_endpoint = 0; |
1024 | c67x00_handle_successful_td(c67x00, td); |
1025 | |
1026 | cont: |
1027 | if (clear_endpoint) |
1028 | c67x00_clear_pipe(c67x00, last_td: td); |
1029 | if (ack_ok) |
1030 | usb_settoggle(td_udev(td), usb_pipeendpoint(td->pipe), |
1031 | usb_pipeout(td->pipe), |
1032 | !(td->ctrl_reg & SEQ_SEL)); |
1033 | /* next in list could have been removed, due to clear_pipe! */ |
1034 | tmp = list_entry(td->td_list.next, typeof(*td), td_list); |
1035 | c67x00_release_td(td); |
1036 | } |
1037 | } |
1038 | |
1039 | /* -------------------------------------------------------------------------- */ |
1040 | |
1041 | static inline int c67x00_all_tds_processed(struct c67x00_hcd *c67x00) |
1042 | { |
1043 | /* If all tds are processed, we can check the previous frame (if |
1044 | * there was any) and start our next frame. |
1045 | */ |
1046 | return !c67x00_ll_husb_get_current_td(sie: c67x00->sie); |
1047 | } |
1048 | |
1049 | /* |
1050 | * Send td to C67X00 |
1051 | */ |
1052 | static void c67x00_send_td(struct c67x00_hcd *c67x00, struct c67x00_td *td) |
1053 | { |
1054 | int len = td_length(td); |
1055 | |
1056 | if (len && ((td->pid_ep & TD_PIDEPMASK_PID) != TD_PID_IN)) |
1057 | c67x00_ll_write_mem_le16(dev: c67x00->sie->dev, td_ly_base_addr(td), |
1058 | data: td->data, len); |
1059 | |
1060 | c67x00_ll_write_mem_le16(dev: c67x00->sie->dev, |
1061 | addr: td->td_addr, data: td, CY_TD_SIZE); |
1062 | } |
1063 | |
1064 | static void c67x00_send_frame(struct c67x00_hcd *c67x00) |
1065 | { |
1066 | struct c67x00_td *td; |
1067 | |
1068 | if (list_empty(head: &c67x00->td_list)) |
1069 | dev_warn(c67x00_hcd_dev(c67x00), |
1070 | "%s: td list should not be empty here!\n" , |
1071 | __func__); |
1072 | |
1073 | list_for_each_entry(td, &c67x00->td_list, td_list) { |
1074 | if (td->td_list.next == &c67x00->td_list) |
1075 | td->next_td_addr = 0; /* Last td in list */ |
1076 | |
1077 | c67x00_send_td(c67x00, td); |
1078 | } |
1079 | |
1080 | c67x00_ll_husb_set_current_td(sie: c67x00->sie, addr: c67x00->td_base_addr); |
1081 | } |
1082 | |
1083 | /* -------------------------------------------------------------------------- */ |
1084 | |
1085 | /* |
1086 | * c67x00_do_work - Schedulers state machine |
1087 | */ |
1088 | static void c67x00_do_work(struct c67x00_hcd *c67x00) |
1089 | { |
1090 | spin_lock(lock: &c67x00->lock); |
1091 | /* Make sure all tds are processed */ |
1092 | if (!c67x00_all_tds_processed(c67x00)) |
1093 | goto out; |
1094 | |
1095 | c67x00_check_td_list(c67x00); |
1096 | |
1097 | /* no td's are being processed (current == 0) |
1098 | * and all have been "checked" */ |
1099 | complete(&c67x00->endpoint_disable); |
1100 | |
1101 | if (!list_empty(head: &c67x00->td_list)) |
1102 | goto out; |
1103 | |
1104 | c67x00->current_frame = c67x00_get_current_frame_number(c67x00); |
1105 | if (c67x00->current_frame == c67x00->last_frame) |
1106 | goto out; /* Don't send tds in same frame */ |
1107 | c67x00->last_frame = c67x00->current_frame; |
1108 | |
1109 | /* If no urbs are scheduled, our work is done */ |
1110 | if (!c67x00->urb_count) { |
1111 | c67x00_ll_hpi_disable_sofeop(sie: c67x00->sie); |
1112 | goto out; |
1113 | } |
1114 | |
1115 | c67x00_fill_frame(c67x00); |
1116 | if (!list_empty(head: &c67x00->td_list)) |
1117 | /* TD's have been added to the frame */ |
1118 | c67x00_send_frame(c67x00); |
1119 | |
1120 | out: |
1121 | spin_unlock(lock: &c67x00->lock); |
1122 | } |
1123 | |
1124 | /* -------------------------------------------------------------------------- */ |
1125 | |
1126 | static void c67x00_sched_work(struct work_struct *work) |
1127 | { |
1128 | struct c67x00_hcd *c67x00; |
1129 | |
1130 | c67x00 = container_of(work, struct c67x00_hcd, work); |
1131 | c67x00_do_work(c67x00); |
1132 | } |
1133 | |
1134 | void c67x00_sched_kick(struct c67x00_hcd *c67x00) |
1135 | { |
1136 | queue_work(wq: system_highpri_wq, work: &c67x00->work); |
1137 | } |
1138 | |
1139 | int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00) |
1140 | { |
1141 | INIT_WORK(&c67x00->work, c67x00_sched_work); |
1142 | return 0; |
1143 | } |
1144 | |
1145 | void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00) |
1146 | { |
1147 | cancel_work_sync(work: &c67x00->work); |
1148 | } |
1149 | |