1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2001-2002 by David Brownell
4 */
5
6 #ifndef __LINUX_EHCI_HCD_H
7 #define __LINUX_EHCI_HCD_H
8
9 /* definitions used for the EHCI driver */
10
11 /*
12 * __hc32 and __hc16 are "Host Controller" types, they may be equivalent to
13 * __leXX (normally) or __beXX (given EHCI_BIG_ENDIAN_DESC), depending on
14 * the host controller implementation.
15 *
16 * To facilitate the strongest possible byte-order checking from "sparse"
17 * and so on, we use __leXX unless that's not practical.
18 */
19 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
20 typedef __u32 __bitwise __hc32;
21 typedef __u16 __bitwise __hc16;
22 #else
23 #define __hc32 __le32
24 #define __hc16 __le16
25 #endif
26
27 /* statistics can be kept for tuning/monitoring */
28 #ifdef CONFIG_DYNAMIC_DEBUG
29 #define EHCI_STATS
30 #endif
31
32 struct ehci_stats {
33 /* irq usage */
34 unsigned long normal;
35 unsigned long error;
36 unsigned long iaa;
37 unsigned long lost_iaa;
38
39 /* termination of urbs from core */
40 unsigned long complete;
41 unsigned long unlink;
42 };
43
44 /*
45 * Scheduling and budgeting information for periodic transfers, for both
46 * high-speed devices and full/low-speed devices lying behind a TT.
47 */
48 struct ehci_per_sched {
49 struct usb_device *udev; /* access to the TT */
50 struct usb_host_endpoint *ep;
51 struct list_head ps_list; /* node on ehci_tt's ps_list */
52 u16 tt_usecs; /* time on the FS/LS bus */
53 u16 cs_mask; /* C-mask and S-mask bytes */
54 u16 period; /* actual period in frames */
55 u16 phase; /* actual phase, frame part */
56 u8 bw_phase; /* same, for bandwidth
57 reservation */
58 u8 phase_uf; /* uframe part of the phase */
59 u8 usecs, c_usecs; /* times on the HS bus */
60 u8 bw_uperiod; /* period in microframes, for
61 bandwidth reservation */
62 u8 bw_period; /* same, in frames */
63 };
64 #define NO_FRAME 29999 /* frame not assigned yet */
65
66 /* ehci_hcd->lock guards shared data against other CPUs:
67 * ehci_hcd: async, unlink, periodic (and shadow), ...
68 * usb_host_endpoint: hcpriv
69 * ehci_qh: qh_next, qtd_list
70 * ehci_qtd: qtd_list
71 *
72 * Also, hold this lock when talking to HC registers or
73 * when updating hw_* fields in shared qh/qtd/... structures.
74 */
75
76 #define EHCI_MAX_ROOT_PORTS 15 /* see HCS_N_PORTS */
77
78 /*
79 * ehci_rh_state values of EHCI_RH_RUNNING or above mean that the
80 * controller may be doing DMA. Lower values mean there's no DMA.
81 */
82 enum ehci_rh_state {
83 EHCI_RH_HALTED,
84 EHCI_RH_SUSPENDED,
85 EHCI_RH_RUNNING,
86 EHCI_RH_STOPPING
87 };
88
89 /*
90 * Timer events, ordered by increasing delay length.
91 * Always update event_delays_ns[] and event_handlers[] (defined in
92 * ehci-timer.c) in parallel with this list.
93 */
94 enum ehci_hrtimer_event {
95 EHCI_HRTIMER_POLL_ASS, /* Poll for async schedule off */
96 EHCI_HRTIMER_POLL_PSS, /* Poll for periodic schedule off */
97 EHCI_HRTIMER_POLL_DEAD, /* Wait for dead controller to stop */
98 EHCI_HRTIMER_UNLINK_INTR, /* Wait for interrupt QH unlink */
99 EHCI_HRTIMER_FREE_ITDS, /* Wait for unused iTDs and siTDs */
100 EHCI_HRTIMER_ACTIVE_UNLINK, /* Wait while unlinking an active QH */
101 EHCI_HRTIMER_START_UNLINK_INTR, /* Unlink empty interrupt QHs */
102 EHCI_HRTIMER_ASYNC_UNLINKS, /* Unlink empty async QHs */
103 EHCI_HRTIMER_IAA_WATCHDOG, /* Handle lost IAA interrupts */
104 EHCI_HRTIMER_DISABLE_PERIODIC, /* Wait to disable periodic sched */
105 EHCI_HRTIMER_DISABLE_ASYNC, /* Wait to disable async sched */
106 EHCI_HRTIMER_IO_WATCHDOG, /* Check for missing IRQs */
107 EHCI_HRTIMER_NUM_EVENTS /* Must come last */
108 };
109 #define EHCI_HRTIMER_NO_EVENT 99
110
111 struct ehci_hcd { /* one per controller */
112 /* timing support */
113 enum ehci_hrtimer_event next_hrtimer_event;
114 unsigned enabled_hrtimer_events;
115 ktime_t hr_timeouts[EHCI_HRTIMER_NUM_EVENTS];
116 struct hrtimer hrtimer;
117
118 int PSS_poll_count;
119 int ASS_poll_count;
120 int died_poll_count;
121
122 /* glue to PCI and HCD framework */
123 struct ehci_caps __iomem *caps;
124 struct ehci_regs __iomem *regs;
125 struct ehci_dbg_port __iomem *debug;
126
127 __u32 hcs_params; /* cached register copy */
128 spinlock_t lock;
129 enum ehci_rh_state rh_state;
130
131 /* general schedule support */
132 bool scanning:1;
133 bool need_rescan:1;
134 bool intr_unlinking:1;
135 bool iaa_in_progress:1;
136 bool async_unlinking:1;
137 bool shutdown:1;
138 struct ehci_qh *qh_scan_next;
139
140 /* async schedule support */
141 struct ehci_qh *async;
142 struct ehci_qh *dummy; /* For AMD quirk use */
143 struct list_head async_unlink;
144 struct list_head async_idle;
145 unsigned async_unlink_cycle;
146 unsigned async_count; /* async activity count */
147 __hc32 old_current; /* Test for QH becoming */
148 __hc32 old_token; /* inactive during unlink */
149
150 /* periodic schedule support */
151 #define DEFAULT_I_TDPS 1024 /* some HCs can do less */
152 unsigned periodic_size;
153 __hc32 *periodic; /* hw periodic table */
154 dma_addr_t periodic_dma;
155 struct list_head intr_qh_list;
156 unsigned i_thresh; /* uframes HC might cache */
157
158 union ehci_shadow *pshadow; /* mirror hw periodic table */
159 struct list_head intr_unlink_wait;
160 struct list_head intr_unlink;
161 unsigned intr_unlink_wait_cycle;
162 unsigned intr_unlink_cycle;
163 unsigned now_frame; /* frame from HC hardware */
164 unsigned last_iso_frame; /* last frame scanned for iso */
165 unsigned intr_count; /* intr activity count */
166 unsigned isoc_count; /* isoc activity count */
167 unsigned periodic_count; /* periodic activity count */
168 unsigned uframe_periodic_max; /* max periodic time per uframe */
169
170
171 /* list of itds & sitds completed while now_frame was still active */
172 struct list_head cached_itd_list;
173 struct ehci_itd *last_itd_to_free;
174 struct list_head cached_sitd_list;
175 struct ehci_sitd *last_sitd_to_free;
176
177 /* per root hub port */
178 unsigned long reset_done[EHCI_MAX_ROOT_PORTS];
179
180 /* bit vectors (one bit per port) */
181 unsigned long bus_suspended; /* which ports were
182 already suspended at the start of a bus suspend */
183 unsigned long companion_ports; /* which ports are
184 dedicated to the companion controller */
185 unsigned long owned_ports; /* which ports are
186 owned by the companion during a bus suspend */
187 unsigned long port_c_suspend; /* which ports have
188 the change-suspend feature turned on */
189 unsigned long suspended_ports; /* which ports are
190 suspended */
191 unsigned long resuming_ports; /* which ports have
192 started to resume */
193
194 /* per-HC memory pools (could be per-bus, but ...) */
195 struct dma_pool *qh_pool; /* qh per active urb */
196 struct dma_pool *qtd_pool; /* one or more per qh */
197 struct dma_pool *itd_pool; /* itd per iso urb */
198 struct dma_pool *sitd_pool; /* sitd per split iso urb */
199
200 unsigned random_frame;
201 unsigned long next_statechange;
202 ktime_t last_periodic_enable;
203 u32 command;
204
205 /* SILICON QUIRKS */
206 unsigned no_selective_suspend:1;
207 unsigned has_fsl_port_bug:1; /* FreeScale */
208 unsigned has_fsl_hs_errata:1; /* Freescale HS quirk */
209 unsigned has_fsl_susp_errata:1; /* NXP SUSP quirk */
210 unsigned big_endian_mmio:1;
211 unsigned big_endian_desc:1;
212 unsigned big_endian_capbase:1;
213 unsigned has_amcc_usb23:1;
214 unsigned need_io_watchdog:1;
215 unsigned amd_pll_fix:1;
216 unsigned use_dummy_qh:1; /* AMD Frame List table quirk*/
217 unsigned has_synopsys_hc_bug:1; /* Synopsys HC */
218 unsigned frame_index_bug:1; /* MosChip (AKA NetMos) */
219 unsigned need_oc_pp_cycle:1; /* MPC834X port power */
220 unsigned imx28_write_fix:1; /* For Freescale i.MX28 */
221
222 /* required for usb32 quirk */
223 #define OHCI_CTRL_HCFS (3 << 6)
224 #define OHCI_USB_OPER (2 << 6)
225 #define OHCI_USB_SUSPEND (3 << 6)
226
227 #define OHCI_HCCTRL_OFFSET 0x4
228 #define OHCI_HCCTRL_LEN 0x4
229 __hc32 *ohci_hcctrl_reg;
230 unsigned has_hostpc:1;
231 unsigned has_tdi_phy_lpm:1;
232 unsigned has_ppcd:1; /* support per-port change bits */
233 u8 sbrn; /* packed release number */
234
235 /* irq statistics */
236 #ifdef EHCI_STATS
237 struct ehci_stats stats;
238 # define INCR(x) ((x)++)
239 #else
240 # define INCR(x) do {} while (0)
241 #endif
242
243 /* debug files */
244 #ifdef CONFIG_DYNAMIC_DEBUG
245 struct dentry *debug_dir;
246 #endif
247
248 /* bandwidth usage */
249 #define EHCI_BANDWIDTH_SIZE 64
250 #define EHCI_BANDWIDTH_FRAMES (EHCI_BANDWIDTH_SIZE >> 3)
251 u8 bandwidth[EHCI_BANDWIDTH_SIZE];
252 /* us allocated per uframe */
253 u8 tt_budget[EHCI_BANDWIDTH_SIZE];
254 /* us budgeted per uframe */
255 struct list_head tt_list;
256
257 /* platform-specific data -- must come last */
258 unsigned long priv[0] __aligned(sizeof(s64));
259 };
260
261 /* convert between an HCD pointer and the corresponding EHCI_HCD */
hcd_to_ehci(struct usb_hcd * hcd)262 static inline struct ehci_hcd *hcd_to_ehci(struct usb_hcd *hcd)
263 {
264 return (struct ehci_hcd *) (hcd->hcd_priv);
265 }
ehci_to_hcd(struct ehci_hcd * ehci)266 static inline struct usb_hcd *ehci_to_hcd(struct ehci_hcd *ehci)
267 {
268 return container_of((void *) ehci, struct usb_hcd, hcd_priv);
269 }
270
271 /*-------------------------------------------------------------------------*/
272
273 #include <linux/usb/ehci_def.h>
274
275 /*-------------------------------------------------------------------------*/
276
277 #define QTD_NEXT(ehci, dma) cpu_to_hc32(ehci, (u32)dma)
278
279 /*
280 * EHCI Specification 0.95 Section 3.5
281 * QTD: describe data transfer components (buffer, direction, ...)
282 * See Fig 3-6 "Queue Element Transfer Descriptor Block Diagram".
283 *
284 * These are associated only with "QH" (Queue Head) structures,
285 * used with control, bulk, and interrupt transfers.
286 */
287 struct ehci_qtd {
288 /* first part defined by EHCI spec */
289 __hc32 hw_next; /* see EHCI 3.5.1 */
290 __hc32 hw_alt_next; /* see EHCI 3.5.2 */
291 __hc32 hw_token; /* see EHCI 3.5.3 */
292 #define QTD_TOGGLE (1 << 31) /* data toggle */
293 #define QTD_LENGTH(tok) (((tok)>>16) & 0x7fff)
294 #define QTD_IOC (1 << 15) /* interrupt on complete */
295 #define QTD_CERR(tok) (((tok)>>10) & 0x3)
296 #define QTD_PID(tok) (((tok)>>8) & 0x3)
297 #define QTD_STS_ACTIVE (1 << 7) /* HC may execute this */
298 #define QTD_STS_HALT (1 << 6) /* halted on error */
299 #define QTD_STS_DBE (1 << 5) /* data buffer error (in HC) */
300 #define QTD_STS_BABBLE (1 << 4) /* device was babbling (qtd halted) */
301 #define QTD_STS_XACT (1 << 3) /* device gave illegal response */
302 #define QTD_STS_MMF (1 << 2) /* incomplete split transaction */
303 #define QTD_STS_STS (1 << 1) /* split transaction state */
304 #define QTD_STS_PING (1 << 0) /* issue PING? */
305
306 #define ACTIVE_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_ACTIVE)
307 #define HALT_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_HALT)
308 #define STATUS_BIT(ehci) cpu_to_hc32(ehci, QTD_STS_STS)
309
310 __hc32 hw_buf[5]; /* see EHCI 3.5.4 */
311 __hc32 hw_buf_hi[5]; /* Appendix B */
312
313 /* the rest is HCD-private */
314 dma_addr_t qtd_dma; /* qtd address */
315 struct list_head qtd_list; /* sw qtd list */
316 struct urb *urb; /* qtd's urb */
317 size_t length; /* length of buffer */
318 } __aligned(32);
319
320 /* mask NakCnt+T in qh->hw_alt_next */
321 #define QTD_MASK(ehci) cpu_to_hc32(ehci, ~0x1f)
322
323 #define IS_SHORT_READ(token) (QTD_LENGTH(token) != 0 && QTD_PID(token) == 1)
324
325 /*-------------------------------------------------------------------------*/
326
327 /* type tag from {qh,itd,sitd,fstn}->hw_next */
328 #define Q_NEXT_TYPE(ehci, dma) ((dma) & cpu_to_hc32(ehci, 3 << 1))
329
330 /*
331 * Now the following defines are not converted using the
332 * cpu_to_le32() macro anymore, since we have to support
333 * "dynamic" switching between be and le support, so that the driver
334 * can be used on one system with SoC EHCI controller using big-endian
335 * descriptors as well as a normal little-endian PCI EHCI controller.
336 */
337 /* values for that type tag */
338 #define Q_TYPE_ITD (0 << 1)
339 #define Q_TYPE_QH (1 << 1)
340 #define Q_TYPE_SITD (2 << 1)
341 #define Q_TYPE_FSTN (3 << 1)
342
343 /* next async queue entry, or pointer to interrupt/periodic QH */
344 #define QH_NEXT(ehci, dma) \
345 (cpu_to_hc32(ehci, (((u32) dma) & ~0x01f) | Q_TYPE_QH))
346
347 /* for periodic/async schedules and qtd lists, mark end of list */
348 #define EHCI_LIST_END(ehci) cpu_to_hc32(ehci, 1) /* "null pointer" to hw */
349
350 /*
351 * Entries in periodic shadow table are pointers to one of four kinds
352 * of data structure. That's dictated by the hardware; a type tag is
353 * encoded in the low bits of the hardware's periodic schedule. Use
354 * Q_NEXT_TYPE to get the tag.
355 *
356 * For entries in the async schedule, the type tag always says "qh".
357 */
358 union ehci_shadow {
359 struct ehci_qh *qh; /* Q_TYPE_QH */
360 struct ehci_itd *itd; /* Q_TYPE_ITD */
361 struct ehci_sitd *sitd; /* Q_TYPE_SITD */
362 struct ehci_fstn *fstn; /* Q_TYPE_FSTN */
363 __hc32 *hw_next; /* (all types) */
364 void *ptr;
365 };
366
367 /*-------------------------------------------------------------------------*/
368
369 /*
370 * EHCI Specification 0.95 Section 3.6
371 * QH: describes control/bulk/interrupt endpoints
372 * See Fig 3-7 "Queue Head Structure Layout".
373 *
374 * These appear in both the async and (for interrupt) periodic schedules.
375 */
376
377 /* first part defined by EHCI spec */
378 struct ehci_qh_hw {
379 __hc32 hw_next; /* see EHCI 3.6.1 */
380 __hc32 hw_info1; /* see EHCI 3.6.2 */
381 #define QH_CONTROL_EP (1 << 27) /* FS/LS control endpoint */
382 #define QH_HEAD (1 << 15) /* Head of async reclamation list */
383 #define QH_TOGGLE_CTL (1 << 14) /* Data toggle control */
384 #define QH_HIGH_SPEED (2 << 12) /* Endpoint speed */
385 #define QH_LOW_SPEED (1 << 12)
386 #define QH_FULL_SPEED (0 << 12)
387 #define QH_INACTIVATE (1 << 7) /* Inactivate on next transaction */
388 __hc32 hw_info2; /* see EHCI 3.6.2 */
389 #define QH_SMASK 0x000000ff
390 #define QH_CMASK 0x0000ff00
391 #define QH_HUBADDR 0x007f0000
392 #define QH_HUBPORT 0x3f800000
393 #define QH_MULT 0xc0000000
394 __hc32 hw_current; /* qtd list - see EHCI 3.6.4 */
395
396 /* qtd overlay (hardware parts of a struct ehci_qtd) */
397 __hc32 hw_qtd_next;
398 __hc32 hw_alt_next;
399 __hc32 hw_token;
400 __hc32 hw_buf[5];
401 __hc32 hw_buf_hi[5];
402 } __aligned(32);
403
404 struct ehci_qh {
405 struct ehci_qh_hw *hw; /* Must come first */
406 /* the rest is HCD-private */
407 dma_addr_t qh_dma; /* address of qh */
408 union ehci_shadow qh_next; /* ptr to qh; or periodic */
409 struct list_head qtd_list; /* sw qtd list */
410 struct list_head intr_node; /* list of intr QHs */
411 struct ehci_qtd *dummy;
412 struct list_head unlink_node;
413 struct ehci_per_sched ps; /* scheduling info */
414
415 unsigned unlink_cycle;
416
417 u8 qh_state;
418 #define QH_STATE_LINKED 1 /* HC sees this */
419 #define QH_STATE_UNLINK 2 /* HC may still see this */
420 #define QH_STATE_IDLE 3 /* HC doesn't see this */
421 #define QH_STATE_UNLINK_WAIT 4 /* LINKED and on unlink q */
422 #define QH_STATE_COMPLETING 5 /* don't touch token.HALT */
423
424 u8 xacterrs; /* XactErr retry counter */
425 #define QH_XACTERR_MAX 32 /* XactErr retry limit */
426
427 u8 unlink_reason;
428 #define QH_UNLINK_HALTED 0x01 /* Halt flag is set */
429 #define QH_UNLINK_SHORT_READ 0x02 /* Recover from a short read */
430 #define QH_UNLINK_DUMMY_OVERLAY 0x04 /* QH overlayed the dummy TD */
431 #define QH_UNLINK_SHUTDOWN 0x08 /* The HC isn't running */
432 #define QH_UNLINK_QUEUE_EMPTY 0x10 /* Reached end of the queue */
433 #define QH_UNLINK_REQUESTED 0x20 /* Disable, reset, or dequeue */
434
435 u8 gap_uf; /* uframes split/csplit gap */
436
437 unsigned is_out:1; /* bulk or intr OUT */
438 unsigned clearing_tt:1; /* Clear-TT-Buf in progress */
439 unsigned dequeue_during_giveback:1;
440 unsigned should_be_inactive:1;
441 };
442
443 /*-------------------------------------------------------------------------*/
444
445 /* description of one iso transaction (up to 3 KB data if highspeed) */
446 struct ehci_iso_packet {
447 /* These will be copied to iTD when scheduling */
448 u64 bufp; /* itd->hw_bufp{,_hi}[pg] |= */
449 __hc32 transaction; /* itd->hw_transaction[i] |= */
450 u8 cross; /* buf crosses pages */
451 /* for full speed OUT splits */
452 u32 buf1;
453 };
454
455 /* temporary schedule data for packets from iso urbs (both speeds)
456 * each packet is one logical usb transaction to the device (not TT),
457 * beginning at stream->next_uframe
458 */
459 struct ehci_iso_sched {
460 struct list_head td_list;
461 unsigned span;
462 unsigned first_packet;
463 struct ehci_iso_packet packet[0];
464 };
465
466 /*
467 * ehci_iso_stream - groups all (s)itds for this endpoint.
468 * acts like a qh would, if EHCI had them for ISO.
469 */
470 struct ehci_iso_stream {
471 /* first field matches ehci_hq, but is NULL */
472 struct ehci_qh_hw *hw;
473
474 u8 bEndpointAddress;
475 u8 highspeed;
476 struct list_head td_list; /* queued itds/sitds */
477 struct list_head free_list; /* list of unused itds/sitds */
478
479 /* output of (re)scheduling */
480 struct ehci_per_sched ps; /* scheduling info */
481 unsigned next_uframe;
482 __hc32 splits;
483
484 /* the rest is derived from the endpoint descriptor,
485 * including the extra info for hw_bufp[0..2]
486 */
487 u16 uperiod; /* period in uframes */
488 u16 maxp;
489 unsigned bandwidth;
490
491 /* This is used to initialize iTD's hw_bufp fields */
492 __hc32 buf0;
493 __hc32 buf1;
494 __hc32 buf2;
495
496 /* this is used to initialize sITD's tt info */
497 __hc32 address;
498 };
499
500 /*-------------------------------------------------------------------------*/
501
502 /*
503 * EHCI Specification 0.95 Section 3.3
504 * Fig 3-4 "Isochronous Transaction Descriptor (iTD)"
505 *
506 * Schedule records for high speed iso xfers
507 */
508 struct ehci_itd {
509 /* first part defined by EHCI spec */
510 __hc32 hw_next; /* see EHCI 3.3.1 */
511 __hc32 hw_transaction[8]; /* see EHCI 3.3.2 */
512 #define EHCI_ISOC_ACTIVE (1<<31) /* activate transfer this slot */
513 #define EHCI_ISOC_BUF_ERR (1<<30) /* Data buffer error */
514 #define EHCI_ISOC_BABBLE (1<<29) /* babble detected */
515 #define EHCI_ISOC_XACTERR (1<<28) /* XactErr - transaction error */
516 #define EHCI_ITD_LENGTH(tok) (((tok)>>16) & 0x0fff)
517 #define EHCI_ITD_IOC (1 << 15) /* interrupt on complete */
518
519 #define ITD_ACTIVE(ehci) cpu_to_hc32(ehci, EHCI_ISOC_ACTIVE)
520
521 __hc32 hw_bufp[7]; /* see EHCI 3.3.3 */
522 __hc32 hw_bufp_hi[7]; /* Appendix B */
523
524 /* the rest is HCD-private */
525 dma_addr_t itd_dma; /* for this itd */
526 union ehci_shadow itd_next; /* ptr to periodic q entry */
527
528 struct urb *urb;
529 struct ehci_iso_stream *stream; /* endpoint's queue */
530 struct list_head itd_list; /* list of stream's itds */
531
532 /* any/all hw_transactions here may be used by that urb */
533 unsigned frame; /* where scheduled */
534 unsigned pg;
535 unsigned index[8]; /* in urb->iso_frame_desc */
536 } __aligned(32);
537
538 /*-------------------------------------------------------------------------*/
539
540 /*
541 * EHCI Specification 0.95 Section 3.4
542 * siTD, aka split-transaction isochronous Transfer Descriptor
543 * ... describe full speed iso xfers through TT in hubs
544 * see Figure 3-5 "Split-transaction Isochronous Transaction Descriptor (siTD)
545 */
546 struct ehci_sitd {
547 /* first part defined by EHCI spec */
548 __hc32 hw_next;
549 /* uses bit field macros above - see EHCI 0.95 Table 3-8 */
550 __hc32 hw_fullspeed_ep; /* EHCI table 3-9 */
551 __hc32 hw_uframe; /* EHCI table 3-10 */
552 __hc32 hw_results; /* EHCI table 3-11 */
553 #define SITD_IOC (1 << 31) /* interrupt on completion */
554 #define SITD_PAGE (1 << 30) /* buffer 0/1 */
555 #define SITD_LENGTH(x) (((x) >> 16) & 0x3ff)
556 #define SITD_STS_ACTIVE (1 << 7) /* HC may execute this */
557 #define SITD_STS_ERR (1 << 6) /* error from TT */
558 #define SITD_STS_DBE (1 << 5) /* data buffer error (in HC) */
559 #define SITD_STS_BABBLE (1 << 4) /* device was babbling */
560 #define SITD_STS_XACT (1 << 3) /* illegal IN response */
561 #define SITD_STS_MMF (1 << 2) /* incomplete split transaction */
562 #define SITD_STS_STS (1 << 1) /* split transaction state */
563
564 #define SITD_ACTIVE(ehci) cpu_to_hc32(ehci, SITD_STS_ACTIVE)
565
566 __hc32 hw_buf[2]; /* EHCI table 3-12 */
567 __hc32 hw_backpointer; /* EHCI table 3-13 */
568 __hc32 hw_buf_hi[2]; /* Appendix B */
569
570 /* the rest is HCD-private */
571 dma_addr_t sitd_dma;
572 union ehci_shadow sitd_next; /* ptr to periodic q entry */
573
574 struct urb *urb;
575 struct ehci_iso_stream *stream; /* endpoint's queue */
576 struct list_head sitd_list; /* list of stream's sitds */
577 unsigned frame;
578 unsigned index;
579 } __aligned(32);
580
581 /*-------------------------------------------------------------------------*/
582
583 /*
584 * EHCI Specification 0.96 Section 3.7
585 * Periodic Frame Span Traversal Node (FSTN)
586 *
587 * Manages split interrupt transactions (using TT) that span frame boundaries
588 * into uframes 0/1; see 4.12.2.2. In those uframes, a "save place" FSTN
589 * makes the HC jump (back) to a QH to scan for fs/ls QH completions until
590 * it hits a "restore" FSTN; then it returns to finish other uframe 0/1 work.
591 */
592 struct ehci_fstn {
593 __hc32 hw_next; /* any periodic q entry */
594 __hc32 hw_prev; /* qh or EHCI_LIST_END */
595
596 /* the rest is HCD-private */
597 dma_addr_t fstn_dma;
598 union ehci_shadow fstn_next; /* ptr to periodic q entry */
599 } __aligned(32);
600
601 /*-------------------------------------------------------------------------*/
602
603 /*
604 * USB-2.0 Specification Sections 11.14 and 11.18
605 * Scheduling and budgeting split transactions using TTs
606 *
607 * A hub can have a single TT for all its ports, or multiple TTs (one for each
608 * port). The bandwidth and budgeting information for the full/low-speed bus
609 * below each TT is self-contained and independent of the other TTs or the
610 * high-speed bus.
611 *
612 * "Bandwidth" refers to the number of microseconds on the FS/LS bus allocated
613 * to an interrupt or isochronous endpoint for each frame. "Budget" refers to
614 * the best-case estimate of the number of full-speed bytes allocated to an
615 * endpoint for each microframe within an allocated frame.
616 *
617 * Removal of an endpoint invalidates a TT's budget. Instead of trying to
618 * keep an up-to-date record, we recompute the budget when it is needed.
619 */
620
621 struct ehci_tt {
622 u16 bandwidth[EHCI_BANDWIDTH_FRAMES];
623
624 struct list_head tt_list; /* List of all ehci_tt's */
625 struct list_head ps_list; /* Items using this TT */
626 struct usb_tt *usb_tt;
627 int tt_port; /* TT port number */
628 };
629
630 /*-------------------------------------------------------------------------*/
631
632 /* Prepare the PORTSC wakeup flags during controller suspend/resume */
633
634 #define ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup) \
635 ehci_adjust_port_wakeup_flags(ehci, true, do_wakeup)
636
637 #define ehci_prepare_ports_for_controller_resume(ehci) \
638 ehci_adjust_port_wakeup_flags(ehci, false, false)
639
640 /*-------------------------------------------------------------------------*/
641
642 #ifdef CONFIG_USB_EHCI_ROOT_HUB_TT
643
644 /*
645 * Some EHCI controllers have a Transaction Translator built into the
646 * root hub. This is a non-standard feature. Each controller will need
647 * to add code to the following inline functions, and call them as
648 * needed (mostly in root hub code).
649 */
650
651 #define ehci_is_TDI(e) (ehci_to_hcd(e)->has_tt)
652
653 /* Returns the speed of a device attached to a port on the root hub. */
654 static inline unsigned int
ehci_port_speed(struct ehci_hcd * ehci,unsigned int portsc)655 ehci_port_speed(struct ehci_hcd *ehci, unsigned int portsc)
656 {
657 if (ehci_is_TDI(ehci)) {
658 switch ((portsc >> (ehci->has_hostpc ? 25 : 26)) & 3) {
659 case 0:
660 return 0;
661 case 1:
662 return USB_PORT_STAT_LOW_SPEED;
663 case 2:
664 default:
665 return USB_PORT_STAT_HIGH_SPEED;
666 }
667 }
668 return USB_PORT_STAT_HIGH_SPEED;
669 }
670
671 #else
672
673 #define ehci_is_TDI(e) (0)
674
675 #define ehci_port_speed(ehci, portsc) USB_PORT_STAT_HIGH_SPEED
676 #endif
677
678 /*-------------------------------------------------------------------------*/
679
680 #ifdef CONFIG_PPC_83xx
681 /* Some Freescale processors have an erratum in which the TT
682 * port number in the queue head was 0..N-1 instead of 1..N.
683 */
684 #define ehci_has_fsl_portno_bug(e) ((e)->has_fsl_port_bug)
685 #else
686 #define ehci_has_fsl_portno_bug(e) (0)
687 #endif
688
689 #define PORTSC_FSL_PFSC 24 /* Port Force Full-Speed Connect */
690
691 #if defined(CONFIG_PPC_85xx)
692 /* Some Freescale processors have an erratum (USB A-005275) in which
693 * incoming packets get corrupted in HS mode
694 */
695 #define ehci_has_fsl_hs_errata(e) ((e)->has_fsl_hs_errata)
696 #else
697 #define ehci_has_fsl_hs_errata(e) (0)
698 #endif
699
700 /*
701 * Some Freescale/NXP processors have an erratum (USB A-005697)
702 * in which we need to wait for 10ms for bus to enter suspend mode
703 * after setting SUSP bit.
704 */
705 #define ehci_has_fsl_susp_errata(e) ((e)->has_fsl_susp_errata)
706
707 /*
708 * While most USB host controllers implement their registers in
709 * little-endian format, a minority (celleb companion chip) implement
710 * them in big endian format.
711 *
712 * This attempts to support either format at compile time without a
713 * runtime penalty, or both formats with the additional overhead
714 * of checking a flag bit.
715 *
716 * ehci_big_endian_capbase is a special quirk for controllers that
717 * implement the HC capability registers as separate registers and not
718 * as fields of a 32-bit register.
719 */
720
721 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
722 #define ehci_big_endian_mmio(e) ((e)->big_endian_mmio)
723 #define ehci_big_endian_capbase(e) ((e)->big_endian_capbase)
724 #else
725 #define ehci_big_endian_mmio(e) 0
726 #define ehci_big_endian_capbase(e) 0
727 #endif
728
729 /*
730 * Big-endian read/write functions are arch-specific.
731 * Other arches can be added if/when they're needed.
732 */
733 #if defined(CONFIG_ARM) && defined(CONFIG_ARCH_IXP4XX)
734 #define readl_be(addr) __raw_readl((__force unsigned *)addr)
735 #define writel_be(val, addr) __raw_writel(val, (__force unsigned *)addr)
736 #endif
737
ehci_readl(const struct ehci_hcd * ehci,__u32 __iomem * regs)738 static inline unsigned int ehci_readl(const struct ehci_hcd *ehci,
739 __u32 __iomem *regs)
740 {
741 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
742 return ehci_big_endian_mmio(ehci) ?
743 readl_be(regs) :
744 readl(regs);
745 #else
746 return readl(regs);
747 #endif
748 }
749
750 #ifdef CONFIG_SOC_IMX28
imx28_ehci_writel(const unsigned int val,volatile __u32 __iomem * addr)751 static inline void imx28_ehci_writel(const unsigned int val,
752 volatile __u32 __iomem *addr)
753 {
754 __asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
755 }
756 #else
imx28_ehci_writel(const unsigned int val,volatile __u32 __iomem * addr)757 static inline void imx28_ehci_writel(const unsigned int val,
758 volatile __u32 __iomem *addr)
759 {
760 }
761 #endif
ehci_writel(const struct ehci_hcd * ehci,const unsigned int val,__u32 __iomem * regs)762 static inline void ehci_writel(const struct ehci_hcd *ehci,
763 const unsigned int val, __u32 __iomem *regs)
764 {
765 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
766 ehci_big_endian_mmio(ehci) ?
767 writel_be(val, regs) :
768 writel(val, regs);
769 #else
770 if (ehci->imx28_write_fix)
771 imx28_ehci_writel(val, regs);
772 else
773 writel(val, regs);
774 #endif
775 }
776
777 /*
778 * On certain ppc-44x SoC there is a HW issue, that could only worked around with
779 * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
780 * Other common bits are dependent on has_amcc_usb23 quirk flag.
781 */
782 #ifdef CONFIG_44x
set_ohci_hcfs(struct ehci_hcd * ehci,int operational)783 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
784 {
785 u32 hc_control;
786
787 hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
788 if (operational)
789 hc_control |= OHCI_USB_OPER;
790 else
791 hc_control |= OHCI_USB_SUSPEND;
792
793 writel_be(hc_control, ehci->ohci_hcctrl_reg);
794 (void) readl_be(ehci->ohci_hcctrl_reg);
795 }
796 #else
set_ohci_hcfs(struct ehci_hcd * ehci,int operational)797 static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
798 { }
799 #endif
800
801 /*-------------------------------------------------------------------------*/
802
803 /*
804 * The AMCC 440EPx not only implements its EHCI registers in big-endian
805 * format, but also its DMA data structures (descriptors).
806 *
807 * EHCI controllers accessed through PCI work normally (little-endian
808 * everywhere), so we won't bother supporting a BE-only mode for now.
809 */
810 #ifdef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
811 #define ehci_big_endian_desc(e) ((e)->big_endian_desc)
812
813 /* cpu to ehci */
cpu_to_hc32(const struct ehci_hcd * ehci,const u32 x)814 static inline __hc32 cpu_to_hc32(const struct ehci_hcd *ehci, const u32 x)
815 {
816 return ehci_big_endian_desc(ehci)
817 ? (__force __hc32)cpu_to_be32(x)
818 : (__force __hc32)cpu_to_le32(x);
819 }
820
821 /* ehci to cpu */
hc32_to_cpu(const struct ehci_hcd * ehci,const __hc32 x)822 static inline u32 hc32_to_cpu(const struct ehci_hcd *ehci, const __hc32 x)
823 {
824 return ehci_big_endian_desc(ehci)
825 ? be32_to_cpu((__force __be32)x)
826 : le32_to_cpu((__force __le32)x);
827 }
828
hc32_to_cpup(const struct ehci_hcd * ehci,const __hc32 * x)829 static inline u32 hc32_to_cpup(const struct ehci_hcd *ehci, const __hc32 *x)
830 {
831 return ehci_big_endian_desc(ehci)
832 ? be32_to_cpup((__force __be32 *)x)
833 : le32_to_cpup((__force __le32 *)x);
834 }
835
836 #else
837
838 /* cpu to ehci */
cpu_to_hc32(const struct ehci_hcd * ehci,const u32 x)839 static inline __hc32 cpu_to_hc32(const struct ehci_hcd *ehci, const u32 x)
840 {
841 return cpu_to_le32(x);
842 }
843
844 /* ehci to cpu */
hc32_to_cpu(const struct ehci_hcd * ehci,const __hc32 x)845 static inline u32 hc32_to_cpu(const struct ehci_hcd *ehci, const __hc32 x)
846 {
847 return le32_to_cpu(x);
848 }
849
hc32_to_cpup(const struct ehci_hcd * ehci,const __hc32 * x)850 static inline u32 hc32_to_cpup(const struct ehci_hcd *ehci, const __hc32 *x)
851 {
852 return le32_to_cpup(x);
853 }
854
855 #endif
856
857 /*-------------------------------------------------------------------------*/
858
859 #define ehci_dbg(ehci, fmt, args...) \
860 dev_dbg(ehci_to_hcd(ehci)->self.controller, fmt, ## args)
861 #define ehci_err(ehci, fmt, args...) \
862 dev_err(ehci_to_hcd(ehci)->self.controller, fmt, ## args)
863 #define ehci_info(ehci, fmt, args...) \
864 dev_info(ehci_to_hcd(ehci)->self.controller, fmt, ## args)
865 #define ehci_warn(ehci, fmt, args...) \
866 dev_warn(ehci_to_hcd(ehci)->self.controller, fmt, ## args)
867
868 /*-------------------------------------------------------------------------*/
869
870 /* Declarations of things exported for use by ehci platform drivers */
871
872 struct ehci_driver_overrides {
873 size_t extra_priv_size;
874 int (*reset)(struct usb_hcd *hcd);
875 int (*port_power)(struct usb_hcd *hcd,
876 int portnum, bool enable);
877 };
878
879 extern void ehci_init_driver(struct hc_driver *drv,
880 const struct ehci_driver_overrides *over);
881 extern int ehci_setup(struct usb_hcd *hcd);
882 extern int ehci_handshake(struct ehci_hcd *ehci, void __iomem *ptr,
883 u32 mask, u32 done, int usec);
884 extern int ehci_reset(struct ehci_hcd *ehci);
885
886 extern int ehci_suspend(struct usb_hcd *hcd, bool do_wakeup);
887 extern int ehci_resume(struct usb_hcd *hcd, bool force_reset);
888 extern void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
889 bool suspending, bool do_wakeup);
890
891 extern int ehci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
892 u16 wIndex, char *buf, u16 wLength);
893
894 #endif /* __LINUX_EHCI_HCD_H */
895
