Branch data Line data Source code
1 : : /*
2 : : * dwc_otg_fiq_fsm.c - The finite state machine FIQ
3 : : *
4 : : * Copyright (c) 2013 Raspberry Pi Foundation
5 : : *
6 : : * Author: Jonathan Bell <jonathan@raspberrypi.org>
7 : : * All rights reserved.
8 : : *
9 : : * Redistribution and use in source and binary forms, with or without
10 : : * modification, are permitted provided that the following conditions are met:
11 : : * * Redistributions of source code must retain the above copyright
12 : : * notice, this list of conditions and the following disclaimer.
13 : : * * Redistributions in binary form must reproduce the above copyright
14 : : * notice, this list of conditions and the following disclaimer in the
15 : : * documentation and/or other materials provided with the distribution.
16 : : * * Neither the name of Raspberry Pi nor the
17 : : * names of its contributors may be used to endorse or promote products
18 : : * derived from this software without specific prior written permission.
19 : : *
20 : : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
21 : : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22 : : * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23 : : * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
24 : : * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25 : : * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 : : * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27 : : * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 : : * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 : : * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 : : *
31 : : * This FIQ implements functionality that performs split transactions on
32 : : * the dwc_otg hardware without any outside intervention. A split transaction
33 : : * is "queued" by nominating a specific host channel to perform the entirety
34 : : * of a split transaction. This FIQ will then perform the microframe-precise
35 : : * scheduling required in each phase of the transaction until completion.
36 : : *
37 : : * The FIQ functionality is glued into the Synopsys driver via the entry point
38 : : * in the FSM enqueue function, and at the exit point in handling a HC interrupt
39 : : * for a FSM-enabled channel.
40 : : *
41 : : * NB: Large parts of this implementation have architecture-specific code.
42 : : * For porting this functionality to other ARM machines, the minimum is required:
43 : : * - An interrupt controller allowing the top-level dwc USB interrupt to be routed
44 : : * to the FIQ
45 : : * - A method of forcing a software generated interrupt from FIQ mode that then
46 : : * triggers an IRQ entry (with the dwc USB handler called by this IRQ number)
47 : : * - Guaranteed interrupt routing such that both the FIQ and SGI occur on the same
48 : : * processor core - there is no locking between the FIQ and IRQ (aside from
49 : : * local_fiq_disable)
50 : : *
51 : : */
52 : :
53 : : #include "dwc_otg_fiq_fsm.h"
54 : :
55 : :
56 : : char buffer[1000*16];
57 : : int wptr;
58 : 0 : void notrace _fiq_print(enum fiq_debug_level dbg_lvl, volatile struct fiq_state *state, char *fmt, ...)
59 : : {
60 : : enum fiq_debug_level dbg_lvl_req = FIQDBG_ERR;
61 : : va_list args;
62 : : char text[17];
63 : 0 : hfnum_data_t hfnum = { .d32 = FIQ_READ(state->dwc_regs_base + 0x408) };
64 : :
65 [ # # # # ]: 0 : if((dbg_lvl & dbg_lvl_req) || dbg_lvl == FIQDBG_ERR)
66 : : {
67 : 0 : snprintf(text, 9, " %4d:%1u ", hfnum.b.frnum/8, hfnum.b.frnum & 7);
68 : 0 : va_start(args, fmt);
69 : 0 : vsnprintf(text+8, 9, fmt, args);
70 : 0 : va_end(args);
71 : :
72 : 0 : memcpy(buffer + wptr, text, 16);
73 : 0 : wptr = (wptr + 16) % sizeof(buffer);
74 : : }
75 : 0 : }
76 : :
77 : :
78 : : #ifdef CONFIG_ARM64
79 : :
80 : : inline void fiq_fsm_spin_lock(fiq_lock_t *lock)
81 : : {
82 : : spin_lock((spinlock_t *)lock);
83 : : }
84 : :
85 : : inline void fiq_fsm_spin_unlock(fiq_lock_t *lock)
86 : : {
87 : : spin_unlock((spinlock_t *)lock);
88 : : }
89 : :
90 : : #else
91 : :
92 : : /**
93 : : * fiq_fsm_spin_lock() - ARMv6+ bare bones spinlock
94 : : * Must be called with local interrupts and FIQ disabled.
95 : : */
96 : : #if defined(CONFIG_ARCH_BCM2835) && defined(CONFIG_SMP)
97 : 916133554 : inline void fiq_fsm_spin_lock(fiq_lock_t *lock)
98 : : {
99 : : unsigned long tmp;
100 : : uint32_t newval;
101 : : fiq_lock_t lockval;
102 : : /* Nested locking, yay. If we are on the same CPU as the fiq, then the disable
103 : : * will be sufficient. If we are on a different CPU, then the lock protects us. */
104 : 916133554 : prefetchw(&lock->slock);
105 : 916131140 : asm volatile (
106 : : "1: ldrex %0, [%3]\n"
107 : : " add %1, %0, %4\n"
108 : : " strex %2, %1, [%3]\n"
109 : : " teq %2, #0\n"
110 : : " bne 1b"
111 : : : "=&r" (lockval), "=&r" (newval), "=&r" (tmp)
112 : : : "r" (&lock->slock), "I" (1 << 16)
113 : : : "cc");
114 : :
115 [ + + ]:15343891028 : while (lockval.tickets.next != lockval.tickets.owner) {
116 :13511614784 : wfe();
117 : : lockval.tickets.owner = READ_ONCE(lock->tickets.owner);
118 : : }
119 : 916136934 : smp_mb();
120 : 916136934 : }
121 : : #else
122 : : inline void fiq_fsm_spin_lock(fiq_lock_t *lock) { }
123 : : #endif
124 : :
125 : : /**
126 : : * fiq_fsm_spin_unlock() - ARMv6+ bare bones spinunlock
127 : : */
128 : : #if defined(CONFIG_ARCH_BCM2835) && defined(CONFIG_SMP)
129 : 633618978 : inline void fiq_fsm_spin_unlock(fiq_lock_t *lock)
130 : : {
131 : 916136070 : smp_mb();
132 : 916136072 : lock->tickets.owner++;
133 : : dsb_sev();
134 : 633618978 : }
135 : : #else
136 : : inline void fiq_fsm_spin_unlock(fiq_lock_t *lock) { }
137 : : #endif
138 : :
139 : : #endif
140 : :
141 : : /**
142 : : * fiq_fsm_restart_channel() - Poke channel enable bit for a split transaction
143 : : * @channel: channel to re-enable
144 : : */
145 : 0 : static void fiq_fsm_restart_channel(struct fiq_state *st, int n, int force)
146 : : {
147 : 0 : hcchar_data_t hcchar = { .d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR) };
148 : :
149 : 0 : hcchar.b.chen = 0;
150 [ # # ]: 0 : if (st->channel[n].hcchar_copy.b.eptype & 0x1) {
151 : 0 : hfnum_data_t hfnum = { .d32 = FIQ_READ(st->dwc_regs_base + HFNUM) };
152 : : /* Hardware bug workaround: update the ssplit index */
153 [ # # ]: 0 : if (st->channel[n].hcsplt_copy.b.spltena)
154 : 0 : st->channel[n].expected_uframe = (hfnum.b.frnum + 1) & 0x3FFF;
155 : :
156 : 0 : hcchar.b.oddfrm = (hfnum.b.frnum & 0x1) ? 0 : 1;
157 : : }
158 : :
159 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR, hcchar.d32);
160 : 0 : hcchar.d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR);
161 : 0 : hcchar.b.chen = 1;
162 : :
163 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR, hcchar.d32);
164 : : fiq_print(FIQDBG_INT, st, "HCGO %01d %01d", n, force);
165 : 0 : }
166 : :
167 : : /**
168 : : * fiq_fsm_setup_csplit() - Prepare a host channel for a CSplit transaction stage
169 : : * @st: Pointer to the channel's state
170 : : * @n : channel number
171 : : *
172 : : * Change host channel registers to perform a complete-split transaction. Being mindful of the
173 : : * endpoint direction, set control regs up correctly.
174 : : */
175 : 0 : static void notrace fiq_fsm_setup_csplit(struct fiq_state *st, int n)
176 : : {
177 : 0 : hcsplt_data_t hcsplt = { .d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCSPLT) };
178 : 0 : hctsiz_data_t hctsiz = { .d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCTSIZ) };
179 : :
180 : 0 : hcsplt.b.compsplt = 1;
181 [ # # ]: 0 : if (st->channel[n].hcchar_copy.b.epdir == 1) {
182 : : // If IN, the CSPLIT result contains the data or a hub handshake. hctsiz = maxpacket.
183 : 0 : hctsiz.b.xfersize = st->channel[n].hctsiz_copy.b.xfersize;
184 : : } else {
185 : : // If OUT, the CSPLIT result contains handshake only.
186 : 0 : hctsiz.b.xfersize = 0;
187 : : }
188 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCSPLT, hcsplt.d32);
189 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCTSIZ, hctsiz.d32);
190 : 0 : mb();
191 : 0 : }
192 : :
193 : : /**
194 : : * fiq_fsm_restart_np_pending() - Restart a single non-periodic contended transfer
195 : : * @st: Pointer to the channel's state
196 : : * @num_channels: Total number of host channels
197 : : * @orig_channel: Channel index of completed transfer
198 : : *
199 : : * In the case where an IN and OUT transfer are simultaneously scheduled to the
200 : : * same device/EP, inadequate hub implementations will misbehave. Once the first
201 : : * transfer is complete, a pending non-periodic split can then be issued.
202 : : */
203 : 0 : static void notrace fiq_fsm_restart_np_pending(struct fiq_state *st, int num_channels, int orig_channel)
204 : : {
205 : : int i;
206 : 0 : int dev_addr = st->channel[orig_channel].hcchar_copy.b.devaddr;
207 : 0 : int ep_num = st->channel[orig_channel].hcchar_copy.b.epnum;
208 [ # # ]: 0 : for (i = 0; i < num_channels; i++) {
209 [ # # # # ]: 0 : if (st->channel[i].fsm == FIQ_NP_SSPLIT_PENDING &&
210 [ # # ]: 0 : st->channel[i].hcchar_copy.b.devaddr == dev_addr &&
211 : 0 : st->channel[i].hcchar_copy.b.epnum == ep_num) {
212 : 0 : st->channel[i].fsm = FIQ_NP_SSPLIT_STARTED;
213 : 0 : fiq_fsm_restart_channel(st, i, 0);
214 : 0 : break;
215 : : }
216 : : }
217 : 0 : }
218 : :
219 : : static inline int notrace fiq_get_xfer_len(struct fiq_state *st, int n)
220 : : {
221 : : /* The xfersize register is a bit wonky. For IN transfers, it decrements by the packet size. */
222 : 0 : hctsiz_data_t hctsiz = { .d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCTSIZ) };
223 : :
224 [ # # # # ]: 0 : if (st->channel[n].hcchar_copy.b.epdir == 0) {
225 : 0 : return st->channel[n].hctsiz_copy.b.xfersize;
226 : : } else {
227 : 0 : return st->channel[n].hctsiz_copy.b.xfersize - hctsiz.b.xfersize;
228 : : }
229 : :
230 : : }
231 : :
232 : :
233 : : /**
234 : : * fiq_increment_dma_buf() - update DMA address for bounce buffers after a CSPLIT
235 : : *
236 : : * Of use only for IN periodic transfers.
237 : : */
238 : 0 : static int notrace fiq_increment_dma_buf(struct fiq_state *st, int num_channels, int n)
239 : : {
240 : : hcdma_data_t hcdma;
241 : 0 : int i = st->channel[n].dma_info.index;
242 : : int len;
243 : 0 : struct fiq_dma_blob *blob = (struct fiq_dma_blob *) st->dma_base;
244 : :
245 : : len = fiq_get_xfer_len(st, n);
246 : : fiq_print(FIQDBG_INT, st, "LEN: %03d", len);
247 : 0 : st->channel[n].dma_info.slot_len[i] = len;
248 : 0 : i++;
249 [ # # ]: 0 : if (i > 6)
250 : 0 : BUG();
251 : :
252 : 0 : hcdma.d32 = (dma_addr_t) &blob->channel[n].index[i].buf[0];
253 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HC_DMA, hcdma.d32);
254 : 0 : st->channel[n].dma_info.index = i;
255 : 0 : return 0;
256 : : }
257 : :
258 : : /**
259 : : * fiq_reload_hctsiz() - for IN transactions, reset HCTSIZ
260 : : */
261 : : static void notrace fiq_fsm_reload_hctsiz(struct fiq_state *st, int n)
262 : : {
263 : 0 : hctsiz_data_t hctsiz = { .d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCTSIZ) };
264 : 0 : hctsiz.b.xfersize = st->channel[n].hctsiz_copy.b.xfersize;
265 : 0 : hctsiz.b.pktcnt = 1;
266 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCTSIZ, hctsiz.d32);
267 : : }
268 : :
269 : : /**
270 : : * fiq_fsm_reload_hcdma() - for OUT transactions, rewind DMA pointer
271 : : */
272 : : static void notrace fiq_fsm_reload_hcdma(struct fiq_state *st, int n)
273 : : {
274 : 0 : hcdma_data_t hcdma = st->channel[n].hcdma_copy;
275 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HC_DMA, hcdma.d32);
276 : : }
277 : :
278 : : /**
279 : : * fiq_iso_out_advance() - update DMA address and split position bits
280 : : * for isochronous OUT transactions.
281 : : *
282 : : * Returns 1 if this is the last packet queued, 0 otherwise. Split-ALL and
283 : : * Split-BEGIN states are not handled - this is done when the transaction was queued.
284 : : *
285 : : * This function must only be called from the FIQ_ISO_OUT_ACTIVE state.
286 : : */
287 : 0 : static int notrace fiq_iso_out_advance(struct fiq_state *st, int num_channels, int n)
288 : : {
289 : : hcsplt_data_t hcsplt;
290 : : hctsiz_data_t hctsiz;
291 : : hcdma_data_t hcdma;
292 : 0 : struct fiq_dma_blob *blob = (struct fiq_dma_blob *) st->dma_base;
293 : : int last = 0;
294 : 0 : int i = st->channel[n].dma_info.index;
295 : :
296 : : fiq_print(FIQDBG_INT, st, "ADV %01d %01d ", n, i);
297 : 0 : i++;
298 [ # # ]: 0 : if (i == 4)
299 : : last = 1;
300 [ # # ]: 0 : if (st->channel[n].dma_info.slot_len[i+1] == 255)
301 : : last = 1;
302 : :
303 : : /* New DMA address - address of bounce buffer referred to in index */
304 : 0 : hcdma.d32 = (dma_addr_t) blob->channel[n].index[i].buf;
305 : : //hcdma.d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HC_DMA);
306 : : //hcdma.d32 += st->channel[n].dma_info.slot_len[i];
307 : : fiq_print(FIQDBG_INT, st, "LAST: %01d ", last);
308 : : fiq_print(FIQDBG_INT, st, "LEN: %03d", st->channel[n].dma_info.slot_len[i]);
309 : 0 : hcsplt.d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCSPLT);
310 : 0 : hctsiz.d32 = FIQ_READ(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCTSIZ);
311 : 0 : hcsplt.b.xactpos = (last) ? ISOC_XACTPOS_END : ISOC_XACTPOS_MID;
312 : : /* Set up new packet length */
313 : 0 : hctsiz.b.pktcnt = 1;
314 : 0 : hctsiz.b.xfersize = st->channel[n].dma_info.slot_len[i];
315 : : fiq_print(FIQDBG_INT, st, "%08x", hctsiz.d32);
316 : :
317 : 0 : st->channel[n].dma_info.index++;
318 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCSPLT, hcsplt.d32);
319 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCTSIZ, hctsiz.d32);
320 : 0 : FIQ_WRITE(st->dwc_regs_base + HC_START + (HC_OFFSET * n) + HC_DMA, hcdma.d32);
321 : 0 : return last;
322 : : }
323 : :
324 : : /**
325 : : * fiq_fsm_tt_next_isoc() - queue next pending isochronous out start-split on a TT
326 : : *
327 : : * Despite the limitations of the DWC core, we can force a microframe pipeline of
328 : : * isochronous OUT start-split transactions while waiting for a corresponding other-type
329 : : * of endpoint to finish its CSPLITs. TTs have big periodic buffers therefore it
330 : : * is very unlikely that filling the start-split FIFO will cause data loss.
331 : : * This allows much better interleaving of transactions in an order-independent way-
332 : : * there is no requirement to prioritise isochronous, just a state-space search has
333 : : * to be performed on each periodic start-split complete interrupt.
334 : : */
335 : 0 : static int notrace fiq_fsm_tt_next_isoc(struct fiq_state *st, int num_channels, int n)
336 : : {
337 : 0 : int hub_addr = st->channel[n].hub_addr;
338 : 0 : int port_addr = st->channel[n].port_addr;
339 : : int i, poked = 0;
340 [ # # ]: 0 : for (i = 0; i < num_channels; i++) {
341 [ # # # # ]: 0 : if (i == n || st->channel[i].fsm == FIQ_PASSTHROUGH)
342 : 0 : continue;
343 [ # # # # ]: 0 : if (st->channel[i].hub_addr == hub_addr &&
344 : 0 : st->channel[i].port_addr == port_addr) {
345 [ # # ]: 0 : switch (st->channel[i].fsm) {
346 : : case FIQ_PER_ISO_OUT_PENDING:
347 [ # # ]: 0 : if (st->channel[i].nrpackets == 1) {
348 : 0 : st->channel[i].fsm = FIQ_PER_ISO_OUT_LAST;
349 : : } else {
350 : 0 : st->channel[i].fsm = FIQ_PER_ISO_OUT_ACTIVE;
351 : : }
352 : 0 : fiq_fsm_restart_channel(st, i, 0);
353 : : poked = 1;
354 : 0 : break;
355 : :
356 : : default:
357 : : break;
358 : : }
359 : : }
360 [ # # ]: 0 : if (poked)
361 : : break;
362 : : }
363 : 0 : return poked;
364 : : }
365 : :
366 : : /**
367 : : * fiq_fsm_tt_in_use() - search for host channels using this TT
368 : : * @n: Channel to use as reference
369 : : *
370 : : */
371 : 0 : int notrace noinline fiq_fsm_tt_in_use(struct fiq_state *st, int num_channels, int n)
372 : : {
373 : 0 : int hub_addr = st->channel[n].hub_addr;
374 : 0 : int port_addr = st->channel[n].port_addr;
375 : : int i, in_use = 0;
376 [ # # ]: 0 : for (i = 0; i < num_channels; i++) {
377 [ # # # # ]: 0 : if (i == n || st->channel[i].fsm == FIQ_PASSTHROUGH)
378 : 0 : continue;
379 [ # # ]: 0 : switch (st->channel[i].fsm) {
380 : : /* TT is reserved for channels that are in the middle of a periodic
381 : : * split transaction.
382 : : */
383 : : case FIQ_PER_SSPLIT_STARTED:
384 : : case FIQ_PER_CSPLIT_WAIT:
385 : : case FIQ_PER_CSPLIT_NYET1:
386 : : //case FIQ_PER_CSPLIT_POLL:
387 : : case FIQ_PER_ISO_OUT_ACTIVE:
388 : : case FIQ_PER_ISO_OUT_LAST:
389 [ # # # # ]: 0 : if (st->channel[i].hub_addr == hub_addr &&
390 : 0 : st->channel[i].port_addr == port_addr) {
391 : : in_use = 1;
392 : : }
393 : : break;
394 : : default:
395 : : break;
396 : : }
397 [ # # ]: 0 : if (in_use)
398 : : break;
399 : : }
400 : 0 : return in_use;
401 : : }
402 : :
403 : : /**
404 : : * fiq_fsm_more_csplits() - determine whether additional CSPLITs need
405 : : * to be issued for this IN transaction.
406 : : *
407 : : * We cannot tell the inbound PID of a data packet due to hardware limitations.
408 : : * we need to make an educated guess as to whether we need to queue another CSPLIT
409 : : * or not. A no-brainer is when we have received enough data to fill the endpoint
410 : : * size, but for endpoints that give variable-length data then we have to resort
411 : : * to heuristics.
412 : : *
413 : : * We also return whether this is the last CSPLIT to be queued, again based on
414 : : * heuristics. This is to allow a 1-uframe overlap of periodic split transactions.
415 : : * Note: requires at least 1 CSPLIT to have been performed prior to being called.
416 : : */
417 : :
418 : : /*
419 : : * We need some way of guaranteeing if a returned periodic packet of size X
420 : : * has a DATA0 PID.
421 : : * The heuristic value of 144 bytes assumes that the received data has maximal
422 : : * bit-stuffing and the clock frequency of the transmitting device is at the lowest
423 : : * permissible limit. If the transfer length results in a final packet size
424 : : * 144 < p <= 188, then an erroneous CSPLIT will be issued.
425 : : * Also used to ensure that an endpoint will nominally only return a single
426 : : * complete-split worth of data.
427 : : */
428 : : #define DATA0_PID_HEURISTIC 144
429 : :
430 : 0 : static int notrace noinline fiq_fsm_more_csplits(struct fiq_state *state, int n, int *probably_last)
431 : : {
432 : :
433 : : int i;
434 : : int total_len = 0;
435 : : int more_needed = 1;
436 : : struct fiq_channel_state *st = &state->channel[n];
437 : :
438 [ # # ]: 0 : for (i = 0; i < st->dma_info.index; i++) {
439 : 0 : total_len += st->dma_info.slot_len[i];
440 : : }
441 : :
442 : 0 : *probably_last = 0;
443 : :
444 [ # # ]: 0 : if (st->hcchar_copy.b.eptype == 0x3) {
445 : : /*
446 : : * An interrupt endpoint will take max 2 CSPLITs. if we are receiving data
447 : : * then this is definitely the last CSPLIT.
448 : : */
449 : 0 : *probably_last = 1;
450 : : } else {
451 : : /* Isoc IN. This is a bit risky if we are the first transaction:
452 : : * we may have been held off slightly. */
453 [ # # # # ]: 0 : if (i > 1 && st->dma_info.slot_len[st->dma_info.index-1] <= DATA0_PID_HEURISTIC) {
454 : : more_needed = 0;
455 : : }
456 : : /* If in the next uframe we will receive enough data to fill the endpoint,
457 : : * then only issue 1 more csplit.
458 : : */
459 [ # # ]: 0 : if (st->hctsiz_copy.b.xfersize - total_len <= DATA0_PID_HEURISTIC)
460 : 0 : *probably_last = 1;
461 : : }
462 : :
463 [ # # ]: 0 : if (total_len >= st->hctsiz_copy.b.xfersize ||
464 [ # # ]: 0 : i == 6 || total_len == 0)
465 : : /* Note: due to bit stuffing it is possible to have > 6 CSPLITs for
466 : : * a single endpoint. Accepting more would completely break our scheduling mechanism though
467 : : * - in these extreme cases we will pass through a truncated packet.
468 : : */
469 : : more_needed = 0;
470 : :
471 : 0 : return more_needed;
472 : : }
473 : :
474 : : /**
475 : : * fiq_fsm_too_late() - Test transaction for lateness
476 : : *
477 : : * If a SSPLIT for a large IN transaction is issued too late in a frame,
478 : : * the hub will disable the port to the device and respond with ERR handshakes.
479 : : * The hub status endpoint will not reflect this change.
480 : : * Returns 1 if we will issue a SSPLIT that will result in a device babble.
481 : : */
482 : 0 : int notrace fiq_fsm_too_late(struct fiq_state *st, int n)
483 : : {
484 : : int uframe;
485 : 0 : hfnum_data_t hfnum = { .d32 = FIQ_READ(st->dwc_regs_base + HFNUM) };
486 : 0 : uframe = hfnum.b.frnum & 0x7;
487 [ # # # # : 0 : if ((uframe < 6) && (st->channel[n].nrpackets + 1 + uframe > 7)) {
# # # # #
# # # ]
488 : : return 1;
489 : : } else {
490 : 0 : return 0;
491 : : }
492 : : }
493 : :
494 : :
495 : : /**
496 : : * fiq_fsm_start_next_periodic() - A half-arsed attempt at a microframe pipeline
497 : : *
498 : : * Search pending transactions in the start-split pending state and queue them.
499 : : * Don't queue packets in uframe .5 (comes out in .6) (USB2.0 11.18.4).
500 : : * Note: we specifically don't do isochronous OUT transactions first because better
501 : : * use of the TT's start-split fifo can be achieved by pipelining an IN before an OUT.
502 : : */
503 : 0 : static void notrace noinline fiq_fsm_start_next_periodic(struct fiq_state *st, int num_channels)
504 : : {
505 : : int n;
506 : 0 : hfnum_data_t hfnum = { .d32 = FIQ_READ(st->dwc_regs_base + HFNUM) };
507 [ # # ]: 0 : if ((hfnum.b.frnum & 0x7) == 5)
508 : 0 : return;
509 [ # # ]: 0 : for (n = 0; n < num_channels; n++) {
510 [ # # ]: 0 : if (st->channel[n].fsm == FIQ_PER_SSPLIT_QUEUED) {
511 : : /* Check to see if any other transactions are using this TT */
512 [ # # ]: 0 : if(!fiq_fsm_tt_in_use(st, num_channels, n)) {
513 [ # # ]: 0 : if (!fiq_fsm_too_late(st, n)) {
514 : 0 : st->channel[n].fsm = FIQ_PER_SSPLIT_STARTED;
515 : : fiq_print(FIQDBG_INT, st, "NEXTPER ");
516 : 0 : fiq_fsm_restart_channel(st, n, 0);
517 : : } else {
518 : 0 : st->channel[n].fsm = FIQ_PER_SPLIT_TIMEOUT;
519 : : }
520 : : break;
521 : : }
522 : : }
523 : : }
524 [ # # ]: 0 : for (n = 0; n < num_channels; n++) {
525 [ # # ]: 0 : if (st->channel[n].fsm == FIQ_PER_ISO_OUT_PENDING) {
526 [ # # ]: 0 : if (!fiq_fsm_tt_in_use(st, num_channels, n)) {
527 : : fiq_print(FIQDBG_INT, st, "NEXTISO ");
528 [ # # ]: 0 : if (st->channel[n].nrpackets == 1)
529 : 0 : st->channel[n].fsm = FIQ_PER_ISO_OUT_LAST;
530 : : else
531 : 0 : st->channel[n].fsm = FIQ_PER_ISO_OUT_ACTIVE;
532 : 0 : fiq_fsm_restart_channel(st, n, 0);
533 : 0 : break;
534 : : }
535 : : }
536 : : }
537 : : }
538 : :
539 : : /**
540 : : * fiq_fsm_update_hs_isoc() - update isochronous frame and transfer data
541 : : * @state: Pointer to fiq_state
542 : : * @n: Channel transaction is active on
543 : : * @hcint: Copy of host channel interrupt register
544 : : *
545 : : * Returns 0 if there are no more transactions for this HC to do, 1
546 : : * otherwise.
547 : : */
548 : 0 : static int notrace noinline fiq_fsm_update_hs_isoc(struct fiq_state *state, int n, hcint_data_t hcint)
549 : : {
550 : : struct fiq_channel_state *st = &state->channel[n];
551 : : int xfer_len = 0, nrpackets = 0;
552 : : hcdma_data_t hcdma;
553 : : fiq_print(FIQDBG_INT, state, "HSISO %02d", n);
554 : :
555 : : xfer_len = fiq_get_xfer_len(state, n);
556 : 0 : st->hs_isoc_info.iso_desc[st->hs_isoc_info.index].actual_length = xfer_len;
557 : :
558 : 0 : st->hs_isoc_info.iso_desc[st->hs_isoc_info.index].status = hcint.d32;
559 : :
560 : 0 : st->hs_isoc_info.index++;
561 [ # # ]: 0 : if (st->hs_isoc_info.index == st->hs_isoc_info.nrframes) {
562 : : return 0;
563 : : }
564 : :
565 : : /* grab the next DMA address offset from the array */
566 : 0 : hcdma.d32 = st->hcdma_copy.d32 + st->hs_isoc_info.iso_desc[st->hs_isoc_info.index].offset;
567 : 0 : FIQ_WRITE(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HC_DMA, hcdma.d32);
568 : :
569 : : /* We need to set multi_count. This is a bit tricky - has to be set per-transaction as
570 : : * the core needs to be told to send the correct number. Caution: for IN transfers,
571 : : * this is always set to the maximum size of the endpoint. */
572 : 0 : xfer_len = st->hs_isoc_info.iso_desc[st->hs_isoc_info.index].length;
573 : : /* Integer divide in a FIQ: fun. FIXME: make this not suck */
574 : 0 : nrpackets = (xfer_len + st->hcchar_copy.b.mps - 1) / st->hcchar_copy.b.mps;
575 [ # # ]: 0 : if (nrpackets == 0)
576 : : nrpackets = 1;
577 : 0 : st->hcchar_copy.b.multicnt = nrpackets;
578 : 0 : st->hctsiz_copy.b.pktcnt = nrpackets;
579 : :
580 : : /* Initial PID also needs to be set */
581 [ # # ]: 0 : if (st->hcchar_copy.b.epdir == 0) {
582 : 0 : st->hctsiz_copy.b.xfersize = xfer_len;
583 [ # # # ]: 0 : switch (st->hcchar_copy.b.multicnt) {
584 : : case 1:
585 : 0 : st->hctsiz_copy.b.pid = DWC_PID_DATA0;
586 : 0 : break;
587 : : case 2:
588 : : case 3:
589 : 0 : st->hctsiz_copy.b.pid = DWC_PID_MDATA;
590 : 0 : break;
591 : : }
592 : :
593 : : } else {
594 : 0 : st->hctsiz_copy.b.xfersize = nrpackets * st->hcchar_copy.b.mps;
595 [ # # # # ]: 0 : switch (st->hcchar_copy.b.multicnt) {
596 : : case 1:
597 : 0 : st->hctsiz_copy.b.pid = DWC_PID_DATA0;
598 : 0 : break;
599 : : case 2:
600 : 0 : st->hctsiz_copy.b.pid = DWC_PID_DATA1;
601 : 0 : break;
602 : : case 3:
603 : 0 : st->hctsiz_copy.b.pid = DWC_PID_DATA2;
604 : 0 : break;
605 : : }
606 : : }
607 : 0 : FIQ_WRITE(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCTSIZ, st->hctsiz_copy.d32);
608 : 0 : FIQ_WRITE(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR, st->hcchar_copy.d32);
609 : : /* Channel is enabled on hcint handler exit */
610 : : fiq_print(FIQDBG_INT, state, "HSISOOUT");
611 : 0 : return 1;
612 : : }
613 : :
614 : :
615 : : /**
616 : : * fiq_fsm_do_sof() - FSM start-of-frame interrupt handler
617 : : * @state: Pointer to the state struct passed from banked FIQ mode registers.
618 : : * @num_channels: set according to the DWC hardware configuration
619 : : *
620 : : * The SOF handler in FSM mode has two functions
621 : : * 1. Hold off SOF from causing schedule advancement in IRQ context if there's
622 : : * nothing to do
623 : : * 2. Advance certain FSM states that require either a microframe delay, or a microframe
624 : : * of holdoff.
625 : : *
626 : : * The second part is architecture-specific to mach-bcm2835 -
627 : : * a sane interrupt controller would have a mask register for ARM interrupt sources
628 : : * to be promoted to the nFIQ line, but it doesn't. Instead a single interrupt
629 : : * number (USB) can be enabled. This means that certain parts of the USB specification
630 : : * that require "wait a little while, then issue another packet" cannot be fulfilled with
631 : : * the timing granularity required to achieve optimal throughout. The workaround is to use
632 : : * the SOF "timer" (125uS) to perform this task.
633 : : */
634 : 0 : static int notrace noinline fiq_fsm_do_sof(struct fiq_state *state, int num_channels)
635 : : {
636 : 0 : hfnum_data_t hfnum = { .d32 = FIQ_READ(state->dwc_regs_base + HFNUM) };
637 : : int n;
638 : : int kick_irq = 0;
639 : :
640 [ # # ]: 0 : if ((hfnum.b.frnum & 0x7) == 1) {
641 : : /* We cannot issue csplits for transactions in the last frame past (n+1).1
642 : : * Check to see if there are any transactions that are stale.
643 : : * Boot them out.
644 : : */
645 [ # # ]: 0 : for (n = 0; n < num_channels; n++) {
646 [ # # ]: 0 : switch (state->channel[n].fsm) {
647 : : case FIQ_PER_CSPLIT_WAIT:
648 : : case FIQ_PER_CSPLIT_NYET1:
649 : : case FIQ_PER_CSPLIT_POLL:
650 : : case FIQ_PER_CSPLIT_LAST:
651 : : /* Check if we are no longer in the same full-speed frame. */
652 [ # # ]: 0 : if (((state->channel[n].expected_uframe & 0x3FFF) & ~0x7) <
653 : : (hfnum.b.frnum & ~0x7))
654 : 0 : state->channel[n].fsm = FIQ_PER_SPLIT_TIMEOUT;
655 : : break;
656 : : default:
657 : : break;
658 : : }
659 : : }
660 : : }
661 : :
662 [ # # ]: 0 : for (n = 0; n < num_channels; n++) {
663 [ # # # # : 0 : switch (state->channel[n].fsm) {
# # # ]
664 : :
665 : : case FIQ_NP_SSPLIT_RETRY:
666 : : case FIQ_NP_IN_CSPLIT_RETRY:
667 : : case FIQ_NP_OUT_CSPLIT_RETRY:
668 : 0 : fiq_fsm_restart_channel(state, n, 0);
669 : 0 : break;
670 : :
671 : : case FIQ_HS_ISOC_SLEEPING:
672 : : /* Is it time to wake this channel yet? */
673 [ # # ]: 0 : if (--state->channel[n].uframe_sleeps == 0) {
674 : 0 : state->channel[n].fsm = FIQ_HS_ISOC_TURBO;
675 : 0 : fiq_fsm_restart_channel(state, n, 0);
676 : : }
677 : : break;
678 : :
679 : : case FIQ_PER_SSPLIT_QUEUED:
680 [ # # ]: 0 : if ((hfnum.b.frnum & 0x7) == 5)
681 : : break;
682 [ # # ]: 0 : if(!fiq_fsm_tt_in_use(state, num_channels, n)) {
683 [ # # ]: 0 : if (!fiq_fsm_too_late(state, n)) {
684 : : fiq_print(FIQDBG_INT, state, "SOF GO %01d", n);
685 : 0 : fiq_fsm_restart_channel(state, n, 0);
686 : 0 : state->channel[n].fsm = FIQ_PER_SSPLIT_STARTED;
687 : : } else {
688 : : /* Transaction cannot be started without risking a device babble error */
689 : 0 : state->channel[n].fsm = FIQ_PER_SPLIT_TIMEOUT;
690 : 0 : state->haintmsk_saved.b2.chint &= ~(1 << n);
691 : 0 : FIQ_WRITE(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCINTMSK, 0);
692 : : kick_irq |= 1;
693 : : }
694 : : }
695 : : break;
696 : :
697 : : case FIQ_PER_ISO_OUT_PENDING:
698 : : /* Ordinarily, this should be poked after the SSPLIT
699 : : * complete interrupt for a competing transfer on the same
700 : : * TT. Doesn't happen for aborted transactions though.
701 : : */
702 [ # # ]: 0 : if ((hfnum.b.frnum & 0x7) >= 5)
703 : : break;
704 [ # # ]: 0 : if (!fiq_fsm_tt_in_use(state, num_channels, n)) {
705 : : /* Hardware bug. SOF can sometimes occur after the channel halt interrupt
706 : : * that caused this.
707 : : */
708 : 0 : fiq_fsm_restart_channel(state, n, 0);
709 : : fiq_print(FIQDBG_INT, state, "SOF ISOC");
710 [ # # ]: 0 : if (state->channel[n].nrpackets == 1) {
711 : 0 : state->channel[n].fsm = FIQ_PER_ISO_OUT_LAST;
712 : : } else {
713 : 0 : state->channel[n].fsm = FIQ_PER_ISO_OUT_ACTIVE;
714 : : }
715 : : }
716 : : break;
717 : :
718 : : case FIQ_PER_CSPLIT_WAIT:
719 : : /* we are guaranteed to be in this state if and only if the SSPLIT interrupt
720 : : * occurred when the bus transaction occurred. The SOF interrupt reversal bug
721 : : * will utterly bugger this up though.
722 : : */
723 [ # # ]: 0 : if (hfnum.b.frnum != state->channel[n].expected_uframe) {
724 : : fiq_print(FIQDBG_INT, state, "SOFCS %d ", n);
725 : 0 : state->channel[n].fsm = FIQ_PER_CSPLIT_POLL;
726 : 0 : fiq_fsm_restart_channel(state, n, 0);
727 : 0 : fiq_fsm_start_next_periodic(state, num_channels);
728 : :
729 : : }
730 : : break;
731 : :
732 : : case FIQ_PER_SPLIT_TIMEOUT:
733 : : case FIQ_DEQUEUE_ISSUED:
734 : : /* Ugly: we have to force a HCD interrupt.
735 : : * Poke the mask for the channel in question.
736 : : * We will take a fake SOF because of this, but
737 : : * that's OK.
738 : : */
739 : 0 : state->haintmsk_saved.b2.chint &= ~(1 << n);
740 : 0 : FIQ_WRITE(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCINTMSK, 0);
741 : : kick_irq |= 1;
742 : 0 : break;
743 : :
744 : : default:
745 : : break;
746 : : }
747 : : }
748 : :
749 [ # # # # ]: 0 : if (state->kick_np_queues ||
750 : 0 : dwc_frame_num_le(state->next_sched_frame, hfnum.b.frnum))
751 : : kick_irq |= 1;
752 : :
753 : 0 : return !kick_irq;
754 : : }
755 : :
756 : :
757 : : /**
758 : : * fiq_fsm_do_hcintr() - FSM host channel interrupt handler
759 : : * @state: Pointer to the FIQ state struct
760 : : * @num_channels: Number of channels as per hardware config
761 : : * @n: channel for which HAINT(i) was raised
762 : : *
763 : : * An important property is that only the CHHLT interrupt is unmasked. Unfortunately, AHBerr is as well.
764 : : */
765 : 0 : static int notrace noinline fiq_fsm_do_hcintr(struct fiq_state *state, int num_channels, int n)
766 : : {
767 : : hcint_data_t hcint;
768 : : hcintmsk_data_t hcintmsk;
769 : : hcint_data_t hcint_probe;
770 : : hcchar_data_t hcchar;
771 : : int handled = 0;
772 : : int restart = 0;
773 : 0 : int last_csplit = 0;
774 : : int start_next_periodic = 0;
775 : : struct fiq_channel_state *st = &state->channel[n];
776 : : hfnum_data_t hfnum;
777 : :
778 : 0 : hcint.d32 = FIQ_READ(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCINT);
779 : 0 : hcintmsk.d32 = FIQ_READ(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCINTMSK);
780 : 0 : hcint_probe.d32 = hcint.d32 & hcintmsk.d32;
781 : :
782 : : if (st->fsm != FIQ_PASSTHROUGH) {
783 : : fiq_print(FIQDBG_INT, state, "HC%01d ST%02d", n, st->fsm);
784 : : fiq_print(FIQDBG_INT, state, "%08x", hcint.d32);
785 : : }
786 : :
787 [ # # # # : 0 : switch (st->fsm) {
# # # # #
# # # # ]
788 : :
789 : : case FIQ_PASSTHROUGH:
790 : : case FIQ_DEQUEUE_ISSUED:
791 : : /* doesn't belong to us, kick it upstairs */
792 : : break;
793 : :
794 : : case FIQ_PASSTHROUGH_ERRORSTATE:
795 : : /* We are here to emulate the error recovery mechanism of the dwc HCD.
796 : : * Several interrupts are unmasked if a previous transaction failed - it's
797 : : * death for the FIQ to attempt to handle them as the channel isn't halted.
798 : : * Emulate what the HCD does in this situation: mask and continue.
799 : : * The FSM has no other state setup so this has to be handled out-of-band.
800 : : */
801 : : fiq_print(FIQDBG_ERR, state, "ERRST %02d", n);
802 [ # # ]: 0 : if (hcint_probe.b.nak || hcint_probe.b.ack || hcint_probe.b.datatglerr) {
803 : : fiq_print(FIQDBG_ERR, state, "RESET %02d", n);
804 : : /* In some random cases we can get a NAK interrupt coincident with a Xacterr
805 : : * interrupt, after the device has disappeared.
806 : : */
807 [ # # ]: 0 : if (!hcint.b.xacterr)
808 : 0 : st->nr_errors = 0;
809 : 0 : hcintmsk.b.nak = 0;
810 : 0 : hcintmsk.b.ack = 0;
811 : 0 : hcintmsk.b.datatglerr = 0;
812 : 0 : FIQ_WRITE(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCINTMSK, hcintmsk.d32);
813 : 0 : return 1;
814 : : }
815 [ # # ]: 0 : if (hcint_probe.b.chhltd) {
816 : : fiq_print(FIQDBG_ERR, state, "CHHLT %02d", n);
817 : : fiq_print(FIQDBG_ERR, state, "%08x", hcint.d32);
818 : : return 0;
819 : : }
820 : : break;
821 : :
822 : : /* Non-periodic state groups */
823 : : case FIQ_NP_SSPLIT_STARTED:
824 : : case FIQ_NP_SSPLIT_RETRY:
825 : : /* Got a HCINT for a NP SSPLIT. Expected ACK / NAK / fail */
826 [ # # ]: 0 : if (hcint.b.ack) {
827 : : /* SSPLIT complete. For OUT, the data has been sent. For IN, the LS transaction
828 : : * will start shortly. SOF needs to kick the transaction to prevent a NYET flood.
829 : : */
830 [ # # ]: 0 : if(st->hcchar_copy.b.epdir == 1)
831 : 0 : st->fsm = FIQ_NP_IN_CSPLIT_RETRY;
832 : : else
833 : 0 : st->fsm = FIQ_NP_OUT_CSPLIT_RETRY;
834 : 0 : st->nr_errors = 0;
835 : : handled = 1;
836 : 0 : fiq_fsm_setup_csplit(state, n);
837 [ # # ]: 0 : } else if (hcint.b.nak) {
838 : : // No buffer space in TT. Retry on a uframe boundary.
839 : : fiq_fsm_reload_hcdma(state, n);
840 : 0 : st->fsm = FIQ_NP_SSPLIT_RETRY;
841 : : handled = 1;
842 [ # # ]: 0 : } else if (hcint.b.xacterr) {
843 : : // The only other one we care about is xacterr. This implies HS bus error - retry.
844 : 0 : st->nr_errors++;
845 [ # # ]: 0 : if(st->hcchar_copy.b.epdir == 0)
846 : : fiq_fsm_reload_hcdma(state, n);
847 : 0 : st->fsm = FIQ_NP_SSPLIT_RETRY;
848 [ # # ]: 0 : if (st->nr_errors >= 3) {
849 : 0 : st->fsm = FIQ_NP_SPLIT_HS_ABORTED;
850 : : } else {
851 : : handled = 1;
852 : : restart = 1;
853 : : }
854 : : } else {
855 : 0 : st->fsm = FIQ_NP_SPLIT_LS_ABORTED;
856 : : handled = 0;
857 : : restart = 0;
858 : : }
859 : : break;
860 : :
861 : : case FIQ_NP_IN_CSPLIT_RETRY:
862 : : /* Received a CSPLIT done interrupt.
863 : : * Expected Data/NAK/STALL/NYET for IN.
864 : : */
865 [ # # ]: 0 : if (hcint.b.xfercomp) {
866 : : /* For IN, data is present. */
867 : 0 : st->fsm = FIQ_NP_SPLIT_DONE;
868 [ # # ]: 0 : } else if (hcint.b.nak) {
869 : : /* no endpoint data. Punt it upstairs */
870 : 0 : st->fsm = FIQ_NP_SPLIT_DONE;
871 [ # # ]: 0 : } else if (hcint.b.nyet) {
872 : : /* CSPLIT NYET - retry on a uframe boundary. */
873 : : handled = 1;
874 : 0 : st->nr_errors = 0;
875 [ # # ]: 0 : } else if (hcint.b.datatglerr) {
876 : : /* data toggle errors do not set the xfercomp bit. */
877 : 0 : st->fsm = FIQ_NP_SPLIT_LS_ABORTED;
878 [ # # ]: 0 : } else if (hcint.b.xacterr) {
879 : : /* HS error. Retry immediate */
880 : 0 : st->fsm = FIQ_NP_IN_CSPLIT_RETRY;
881 : 0 : st->nr_errors++;
882 [ # # ]: 0 : if (st->nr_errors >= 3) {
883 : 0 : st->fsm = FIQ_NP_SPLIT_HS_ABORTED;
884 : : } else {
885 : : handled = 1;
886 : : restart = 1;
887 : : }
888 [ # # ]: 0 : } else if (hcint.b.stall || hcint.b.bblerr) {
889 : : /* A STALL implies either a LS bus error or a genuine STALL. */
890 : 0 : st->fsm = FIQ_NP_SPLIT_LS_ABORTED;
891 : : } else {
892 : : /* Hardware bug. It's possible in some cases to
893 : : * get a channel halt with nothing else set when
894 : : * the response was a NYET. Treat as local 3-strikes retry.
895 : : */
896 : 0 : hcint_data_t hcint_test = hcint;
897 : 0 : hcint_test.b.chhltd = 0;
898 [ # # ]: 0 : if (!hcint_test.d32) {
899 : 0 : st->nr_errors++;
900 [ # # ]: 0 : if (st->nr_errors >= 3) {
901 : 0 : st->fsm = FIQ_NP_SPLIT_HS_ABORTED;
902 : : } else {
903 : : handled = 1;
904 : : }
905 : : } else {
906 : : /* Bail out if something unexpected happened */
907 : 0 : st->fsm = FIQ_NP_SPLIT_HS_ABORTED;
908 : : }
909 : : }
910 [ # # ]: 0 : if (st->fsm != FIQ_NP_IN_CSPLIT_RETRY) {
911 : 0 : fiq_fsm_restart_np_pending(state, num_channels, n);
912 : : }
913 : : break;
914 : :
915 : : case FIQ_NP_OUT_CSPLIT_RETRY:
916 : : /* Received a CSPLIT done interrupt.
917 : : * Expected ACK/NAK/STALL/NYET/XFERCOMP for OUT.*/
918 [ # # ]: 0 : if (hcint.b.xfercomp) {
919 : 0 : st->fsm = FIQ_NP_SPLIT_DONE;
920 [ # # ]: 0 : } else if (hcint.b.nak) {
921 : : // The HCD will implement the holdoff on frame boundaries.
922 : 0 : st->fsm = FIQ_NP_SPLIT_DONE;
923 [ # # ]: 0 : } else if (hcint.b.nyet) {
924 : : // Hub still processing.
925 : 0 : st->fsm = FIQ_NP_OUT_CSPLIT_RETRY;
926 : : handled = 1;
927 : 0 : st->nr_errors = 0;
928 : : //restart = 1;
929 [ # # ]: 0 : } else if (hcint.b.xacterr) {
930 : : /* HS error. retry immediate */
931 : 0 : st->fsm = FIQ_NP_OUT_CSPLIT_RETRY;
932 : 0 : st->nr_errors++;
933 [ # # ]: 0 : if (st->nr_errors >= 3) {
934 : 0 : st->fsm = FIQ_NP_SPLIT_HS_ABORTED;
935 : : } else {
936 : : handled = 1;
937 : : restart = 1;
938 : : }
939 [ # # ]: 0 : } else if (hcint.b.stall) {
940 : : /* LS bus error or genuine stall */
941 : 0 : st->fsm = FIQ_NP_SPLIT_LS_ABORTED;
942 : : } else {
943 : : /*
944 : : * Hardware bug. It's possible in some cases to get a
945 : : * channel halt with nothing else set when the response was a NYET.
946 : : * Treat as local 3-strikes retry.
947 : : */
948 : 0 : hcint_data_t hcint_test = hcint;
949 : 0 : hcint_test.b.chhltd = 0;
950 [ # # ]: 0 : if (!hcint_test.d32) {
951 : 0 : st->nr_errors++;
952 [ # # ]: 0 : if (st->nr_errors >= 3) {
953 : 0 : st->fsm = FIQ_NP_SPLIT_HS_ABORTED;
954 : : } else {
955 : : handled = 1;
956 : : }
957 : : } else {
958 : : // Something unexpected happened. AHBerror or babble perhaps. Let the IRQ deal with it.
959 : 0 : st->fsm = FIQ_NP_SPLIT_HS_ABORTED;
960 : : }
961 : : }
962 [ # # ]: 0 : if (st->fsm != FIQ_NP_OUT_CSPLIT_RETRY) {
963 : 0 : fiq_fsm_restart_np_pending(state, num_channels, n);
964 : : }
965 : : break;
966 : :
967 : : /* Periodic split states (except isoc out) */
968 : : case FIQ_PER_SSPLIT_STARTED:
969 : : /* Expect an ACK or failure for SSPLIT */
970 [ # # ]: 0 : if (hcint.b.ack) {
971 : : /*
972 : : * SSPLIT transfer complete interrupt - the generation of this interrupt is fraught with bugs.
973 : : * For a packet queued in microframe n-3 to appear in n-2, if the channel is enabled near the EOF1
974 : : * point for microframe n-3, the packet will not appear on the bus until microframe n.
975 : : * Additionally, the generation of the actual interrupt is dodgy. For a packet appearing on the bus
976 : : * in microframe n, sometimes the interrupt is generated immediately. Sometimes, it appears in n+1
977 : : * coincident with SOF for n+1.
978 : : * SOF is also buggy. It can sometimes be raised AFTER the first bus transaction has taken place.
979 : : * These appear to be caused by timing/clock crossing bugs within the core itself.
980 : : * State machine workaround.
981 : : */
982 : 0 : hfnum.d32 = FIQ_READ(state->dwc_regs_base + HFNUM);
983 : 0 : hcchar.d32 = FIQ_READ(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR);
984 : 0 : fiq_fsm_setup_csplit(state, n);
985 : : /* Poke the oddfrm bit. If we are equivalent, we received the interrupt at the correct
986 : : * time. If not, then we're in the next SOF.
987 : : */
988 [ # # ]: 0 : if ((hfnum.b.frnum & 0x1) == hcchar.b.oddfrm) {
989 : : fiq_print(FIQDBG_INT, state, "CSWAIT %01d", n);
990 : 0 : st->expected_uframe = hfnum.b.frnum;
991 : 0 : st->fsm = FIQ_PER_CSPLIT_WAIT;
992 : : } else {
993 : : fiq_print(FIQDBG_INT, state, "CSPOL %01d", n);
994 : : /* For isochronous IN endpoints,
995 : : * we need to hold off if we are expecting a lot of data */
996 [ # # ]: 0 : if (st->hcchar_copy.b.mps < DATA0_PID_HEURISTIC) {
997 : : start_next_periodic = 1;
998 : : }
999 : : /* Danger will robinson: we are in a broken state. If our first interrupt after
1000 : : * this is a NYET, it will be delayed by 1 uframe and result in an unrecoverable
1001 : : * lag. Unmask the NYET interrupt.
1002 : : */
1003 : 0 : st->expected_uframe = (hfnum.b.frnum + 1) & 0x3FFF;
1004 : 0 : st->fsm = FIQ_PER_CSPLIT_BROKEN_NYET1;
1005 : : restart = 1;
1006 : : }
1007 : : handled = 1;
1008 [ # # ]: 0 : } else if (hcint.b.xacterr) {
1009 : : /* 3-strikes retry is enabled, we have hit our max nr_errors */
1010 : 0 : st->fsm = FIQ_PER_SPLIT_HS_ABORTED;
1011 : : start_next_periodic = 1;
1012 : : } else {
1013 : 0 : st->fsm = FIQ_PER_SPLIT_HS_ABORTED;
1014 : : start_next_periodic = 1;
1015 : : }
1016 : : /* We can now queue the next isochronous OUT transaction, if one is pending. */
1017 : 0 : if(fiq_fsm_tt_next_isoc(state, num_channels, n)) {
1018 : : fiq_print(FIQDBG_INT, state, "NEXTISO ");
1019 : : }
1020 : 0 : break;
1021 : :
1022 : : case FIQ_PER_CSPLIT_NYET1:
1023 : : /* First CSPLIT attempt was a NYET. If we get a subsequent NYET,
1024 : : * we are too late and the TT has dropped its CSPLIT fifo.
1025 : : */
1026 : 0 : hfnum.d32 = FIQ_READ(state->dwc_regs_base + HFNUM);
1027 : 0 : hcchar.d32 = FIQ_READ(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR);
1028 : : start_next_periodic = 1;
1029 [ # # ]: 0 : if (hcint.b.nak) {
1030 : 0 : st->fsm = FIQ_PER_SPLIT_DONE;
1031 [ # # ]: 0 : } else if (hcint.b.xfercomp) {
1032 : 0 : fiq_increment_dma_buf(state, num_channels, n);
1033 : 0 : st->fsm = FIQ_PER_CSPLIT_POLL;
1034 : 0 : st->nr_errors = 0;
1035 [ # # ]: 0 : if (fiq_fsm_more_csplits(state, n, &last_csplit)) {
1036 : : handled = 1;
1037 : : restart = 1;
1038 [ # # ]: 0 : if (!last_csplit)
1039 : : start_next_periodic = 0;
1040 : : } else {
1041 : 0 : st->fsm = FIQ_PER_SPLIT_DONE;
1042 : : }
1043 [ # # ]: 0 : } else if (hcint.b.nyet) {
1044 : : /* Doh. Data lost. */
1045 : 0 : st->fsm = FIQ_PER_SPLIT_NYET_ABORTED;
1046 [ # # ]: 0 : } else if (hcint.b.xacterr || hcint.b.stall || hcint.b.bblerr) {
1047 : 0 : st->fsm = FIQ_PER_SPLIT_LS_ABORTED;
1048 : : } else {
1049 : 0 : st->fsm = FIQ_PER_SPLIT_HS_ABORTED;
1050 : : }
1051 : : break;
1052 : :
1053 : : case FIQ_PER_CSPLIT_BROKEN_NYET1:
1054 : : /*
1055 : : * we got here because our host channel is in the delayed-interrupt
1056 : : * state and we cannot take a NYET interrupt any later than when it
1057 : : * occurred. Disable then re-enable the channel if this happens to force
1058 : : * CSPLITs to occur at the right time.
1059 : : */
1060 : 0 : hfnum.d32 = FIQ_READ(state->dwc_regs_base + HFNUM);
1061 : 0 : hcchar.d32 = FIQ_READ(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR);
1062 : : fiq_print(FIQDBG_INT, state, "BROK: %01d ", n);
1063 [ # # ]: 0 : if (hcint.b.nak) {
1064 : 0 : st->fsm = FIQ_PER_SPLIT_DONE;
1065 : : start_next_periodic = 1;
1066 [ # # ]: 0 : } else if (hcint.b.xfercomp) {
1067 : 0 : fiq_increment_dma_buf(state, num_channels, n);
1068 [ # # ]: 0 : if (fiq_fsm_more_csplits(state, n, &last_csplit)) {
1069 : 0 : st->fsm = FIQ_PER_CSPLIT_POLL;
1070 : : handled = 1;
1071 : : restart = 1;
1072 : : start_next_periodic = 1;
1073 : : /* Reload HCTSIZ for the next transfer */
1074 : : fiq_fsm_reload_hctsiz(state, n);
1075 [ # # ]: 0 : if (!last_csplit)
1076 : : start_next_periodic = 0;
1077 : : } else {
1078 : 0 : st->fsm = FIQ_PER_SPLIT_DONE;
1079 : : }
1080 [ # # ]: 0 : } else if (hcint.b.nyet) {
1081 : 0 : st->fsm = FIQ_PER_SPLIT_NYET_ABORTED;
1082 : : start_next_periodic = 1;
1083 [ # # ]: 0 : } else if (hcint.b.xacterr || hcint.b.stall || hcint.b.bblerr) {
1084 : : /* Local 3-strikes retry is handled by the core. This is a ERR response.*/
1085 : 0 : st->fsm = FIQ_PER_SPLIT_LS_ABORTED;
1086 : : } else {
1087 : 0 : st->fsm = FIQ_PER_SPLIT_HS_ABORTED;
1088 : : }
1089 : : break;
1090 : :
1091 : : case FIQ_PER_CSPLIT_POLL:
1092 : 0 : hfnum.d32 = FIQ_READ(state->dwc_regs_base + HFNUM);
1093 : 0 : hcchar.d32 = FIQ_READ(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCCHAR);
1094 : : start_next_periodic = 1;
1095 [ # # ]: 0 : if (hcint.b.nak) {
1096 : 0 : st->fsm = FIQ_PER_SPLIT_DONE;
1097 [ # # ]: 0 : } else if (hcint.b.xfercomp) {
1098 : 0 : fiq_increment_dma_buf(state, num_channels, n);
1099 [ # # ]: 0 : if (fiq_fsm_more_csplits(state, n, &last_csplit)) {
1100 : : handled = 1;
1101 : : restart = 1;
1102 : : /* Reload HCTSIZ for the next transfer */
1103 : : fiq_fsm_reload_hctsiz(state, n);
1104 [ # # ]: 0 : if (!last_csplit)
1105 : : start_next_periodic = 0;
1106 : : } else {
1107 : 0 : st->fsm = FIQ_PER_SPLIT_DONE;
1108 : : }
1109 [ # # ]: 0 : } else if (hcint.b.nyet) {
1110 : : /* Are we a NYET after the first data packet? */
1111 [ # # ]: 0 : if (st->nrpackets == 0) {
1112 : 0 : st->fsm = FIQ_PER_CSPLIT_NYET1;
1113 : : handled = 1;
1114 : : restart = 1;
1115 : : } else {
1116 : : /* We got a NYET when polling CSPLITs. Can happen
1117 : : * if our heuristic fails, or if someone disables us
1118 : : * for any significant length of time.
1119 : : */
1120 [ # # ]: 0 : if (st->nr_errors >= 3) {
1121 : 0 : st->fsm = FIQ_PER_SPLIT_NYET_ABORTED;
1122 : : } else {
1123 : 0 : st->fsm = FIQ_PER_SPLIT_DONE;
1124 : : }
1125 : : }
1126 [ # # ]: 0 : } else if (hcint.b.xacterr || hcint.b.stall || hcint.b.bblerr) {
1127 : : /* For xacterr, Local 3-strikes retry is handled by the core. This is a ERR response.*/
1128 : 0 : st->fsm = FIQ_PER_SPLIT_LS_ABORTED;
1129 : : } else {
1130 : 0 : st->fsm = FIQ_PER_SPLIT_HS_ABORTED;
1131 : : }
1132 : : break;
1133 : :
1134 : : case FIQ_HS_ISOC_TURBO:
1135 [ # # ]: 0 : if (fiq_fsm_update_hs_isoc(state, n, hcint)) {
1136 : : /* more transactions to come */
1137 : : handled = 1;
1138 : : fiq_print(FIQDBG_INT, state, "HSISO M ");
1139 : : /* For strided transfers, put ourselves to sleep */
1140 [ # # ]: 0 : if (st->hs_isoc_info.stride > 1) {
1141 : 0 : st->uframe_sleeps = st->hs_isoc_info.stride - 1;
1142 : 0 : st->fsm = FIQ_HS_ISOC_SLEEPING;
1143 : : } else {
1144 : : restart = 1;
1145 : : }
1146 : : } else {
1147 : 0 : st->fsm = FIQ_HS_ISOC_DONE;
1148 : : fiq_print(FIQDBG_INT, state, "HSISO F ");
1149 : : }
1150 : : break;
1151 : :
1152 : : case FIQ_HS_ISOC_ABORTED:
1153 : : /* This abort is called by the driver rewriting the state mid-transaction
1154 : : * which allows the dequeue mechanism to work more effectively.
1155 : : */
1156 : : break;
1157 : :
1158 : : case FIQ_PER_ISO_OUT_ACTIVE:
1159 [ # # ]: 0 : if (hcint.b.ack) {
1160 [ # # ]: 0 : if(fiq_iso_out_advance(state, num_channels, n)) {
1161 : : /* last OUT transfer */
1162 : 0 : st->fsm = FIQ_PER_ISO_OUT_LAST;
1163 : : /*
1164 : : * Assuming the periodic FIFO in the dwc core
1165 : : * actually does its job properly, we can queue
1166 : : * the next ssplit now and in theory, the wire
1167 : : * transactions will be in-order.
1168 : : */
1169 : : // No it doesn't. It appears to process requests in host channel order.
1170 : : //start_next_periodic = 1;
1171 : : }
1172 : : handled = 1;
1173 : : restart = 1;
1174 : : } else {
1175 : : /*
1176 : : * Isochronous transactions carry on regardless. Log the error
1177 : : * and continue.
1178 : : */
1179 : : //explode += 1;
1180 : 0 : st->nr_errors++;
1181 [ # # ]: 0 : if(fiq_iso_out_advance(state, num_channels, n)) {
1182 : 0 : st->fsm = FIQ_PER_ISO_OUT_LAST;
1183 : : //start_next_periodic = 1;
1184 : : }
1185 : : handled = 1;
1186 : : restart = 1;
1187 : : }
1188 : : break;
1189 : :
1190 : : case FIQ_PER_ISO_OUT_LAST:
1191 [ # # ]: 0 : if (hcint.b.ack) {
1192 : : /* All done here */
1193 : 0 : st->fsm = FIQ_PER_ISO_OUT_DONE;
1194 : : } else {
1195 : 0 : st->fsm = FIQ_PER_ISO_OUT_DONE;
1196 : 0 : st->nr_errors++;
1197 : : }
1198 : : start_next_periodic = 1;
1199 : : break;
1200 : :
1201 : : case FIQ_PER_SPLIT_TIMEOUT:
1202 : : /* SOF kicked us because we overran. */
1203 : : start_next_periodic = 1;
1204 : 0 : break;
1205 : :
1206 : : default:
1207 : : break;
1208 : : }
1209 : :
1210 [ # # ]: 0 : if (handled) {
1211 : 0 : FIQ_WRITE(state->dwc_regs_base + HC_START + (HC_OFFSET * n) + HCINT, hcint.d32);
1212 : : } else {
1213 : : /* Copy the regs into the state so the IRQ knows what to do */
1214 : 0 : st->hcint_copy.d32 = hcint.d32;
1215 : : }
1216 : :
1217 [ # # ]: 0 : if (restart) {
1218 : : /* Restart always implies handled. */
1219 : : if (restart == 2) {
1220 : : /* For complete-split INs, the show must go on.
1221 : : * Force a channel restart */
1222 : : fiq_fsm_restart_channel(state, n, 1);
1223 : : } else {
1224 : 0 : fiq_fsm_restart_channel(state, n, 0);
1225 : : }
1226 : : }
1227 [ # # ]: 0 : if (start_next_periodic) {
1228 : 0 : fiq_fsm_start_next_periodic(state, num_channels);
1229 : : }
1230 : : if (st->fsm != FIQ_PASSTHROUGH)
1231 : : fiq_print(FIQDBG_INT, state, "FSMOUT%02d", st->fsm);
1232 : :
1233 : 0 : return handled;
1234 : : }
1235 : :
1236 : :
1237 : : /**
1238 : : * dwc_otg_fiq_fsm() - Flying State Machine (monster) FIQ
1239 : : * @state: pointer to state struct passed from the banked FIQ mode registers.
1240 : : * @num_channels: set according to the DWC hardware configuration
1241 : : * @dma: pointer to DMA bounce buffers for split transaction slots
1242 : : *
1243 : : * The FSM FIQ performs the low-level tasks that normally would be performed by the microcode
1244 : : * inside an EHCI or similar host controller regarding split transactions. The DWC core
1245 : : * interrupts each and every time a split transaction packet is received or sent successfully.
1246 : : * This results in either an interrupt storm when everything is working "properly", or
1247 : : * the interrupt latency of the system in general breaks time-sensitive periodic split
1248 : : * transactions. Pushing the low-level, but relatively easy state machine work into the FIQ
1249 : : * solves these problems.
1250 : : *
1251 : : * Return: void
1252 : : */
1253 : 0 : void notrace dwc_otg_fiq_fsm(struct fiq_state *state, int num_channels)
1254 : : {
1255 : : gintsts_data_t gintsts, gintsts_handled;
1256 : : gintmsk_data_t gintmsk;
1257 : : //hfnum_data_t hfnum;
1258 : : haint_data_t haint, haint_handled;
1259 : : haintmsk_data_t haintmsk;
1260 : : int kick_irq = 0;
1261 : :
1262 : : /* Ensure peripheral reads issued prior to FIQ entry are complete */
1263 : 0 : dsb(sy);
1264 : :
1265 : 0 : gintsts_handled.d32 = 0;
1266 : 0 : haint_handled.d32 = 0;
1267 : :
1268 : 0 : fiq_fsm_spin_lock(&state->lock);
1269 : 0 : gintsts.d32 = FIQ_READ(state->dwc_regs_base + GINTSTS);
1270 : 0 : gintmsk.d32 = FIQ_READ(state->dwc_regs_base + GINTMSK);
1271 : 0 : gintsts.d32 &= gintmsk.d32;
1272 : :
1273 [ # # ]: 0 : if (gintsts.b.sofintr) {
1274 : : /* For FSM mode, SOF is required to keep the state machine advance for
1275 : : * certain stages of the periodic pipeline. It's death to mask this
1276 : : * interrupt in that case.
1277 : : */
1278 : :
1279 [ # # ]: 0 : if (!fiq_fsm_do_sof(state, num_channels)) {
1280 : : /* Kick IRQ once. Queue advancement means that all pending transactions
1281 : : * will get serviced when the IRQ finally executes.
1282 : : */
1283 [ # # ]: 0 : if (state->gintmsk_saved.b.sofintr == 1)
1284 : : kick_irq |= 1;
1285 : 0 : state->gintmsk_saved.b.sofintr = 0;
1286 : : }
1287 : 0 : gintsts_handled.b.sofintr = 1;
1288 : : }
1289 : :
1290 [ # # ]: 0 : if (gintsts.b.hcintr) {
1291 : : int i;
1292 : 0 : haint.d32 = FIQ_READ(state->dwc_regs_base + HAINT);
1293 : 0 : haintmsk.d32 = FIQ_READ(state->dwc_regs_base + HAINTMSK);
1294 : 0 : haint.d32 &= haintmsk.d32;
1295 : : haint_handled.d32 = 0;
1296 [ # # ]: 0 : for (i=0; i<num_channels; i++) {
1297 [ # # ]: 0 : if (haint.b2.chint & (1 << i)) {
1298 [ # # ]: 0 : if(!fiq_fsm_do_hcintr(state, num_channels, i)) {
1299 : : /* HCINT was not handled in FIQ
1300 : : * HAINT is level-sensitive, leading to level-sensitive ginststs.b.hcint bit.
1301 : : * Mask HAINT(i) but keep top-level hcint unmasked.
1302 : : */
1303 : 0 : state->haintmsk_saved.b2.chint &= ~(1 << i);
1304 : : } else {
1305 : : /* do_hcintr cleaned up after itself, but clear haint */
1306 : 0 : haint_handled.b2.chint |= (1 << i);
1307 : : }
1308 : : }
1309 : : }
1310 : :
1311 [ # # ]: 0 : if (haint_handled.b2.chint) {
1312 : 0 : FIQ_WRITE(state->dwc_regs_base + HAINT, haint_handled.d32);
1313 : : }
1314 : :
1315 [ # # ]: 0 : if (haintmsk.d32 != (haintmsk.d32 & state->haintmsk_saved.d32)) {
1316 : : /*
1317 : : * This is necessary to avoid multiple retriggers of the MPHI in the case
1318 : : * where interrupts are held off and HCINTs start to pile up.
1319 : : * Only wake up the IRQ if a new interrupt came in, was not handled and was
1320 : : * masked.
1321 : : */
1322 : : haintmsk.d32 &= state->haintmsk_saved.d32;
1323 : 0 : FIQ_WRITE(state->dwc_regs_base + HAINTMSK, haintmsk.d32);
1324 : : kick_irq |= 1;
1325 : : }
1326 : : /* Top-Level interrupt - always handled because it's level-sensitive */
1327 : 0 : gintsts_handled.b.hcintr = 1;
1328 : : }
1329 : :
1330 : :
1331 : : /* Clear the bits in the saved register that were not handled but were triggered. */
1332 : 0 : state->gintmsk_saved.d32 &= ~(gintsts.d32 & ~gintsts_handled.d32);
1333 : :
1334 : : /* FIQ didn't handle something - mask has changed - write new mask */
1335 [ # # ]: 0 : if (gintmsk.d32 != (gintmsk.d32 & state->gintmsk_saved.d32)) {
1336 : 0 : gintmsk.d32 &= state->gintmsk_saved.d32;
1337 : 0 : gintmsk.b.sofintr = 1;
1338 : 0 : FIQ_WRITE(state->dwc_regs_base + GINTMSK, gintmsk.d32);
1339 : : // fiq_print(FIQDBG_INT, state, "KICKGINT");
1340 : : // fiq_print(FIQDBG_INT, state, "%08x", gintmsk.d32);
1341 : : // fiq_print(FIQDBG_INT, state, "%08x", state->gintmsk_saved.d32);
1342 : : kick_irq |= 1;
1343 : : }
1344 : :
1345 [ # # ]: 0 : if (gintsts_handled.d32) {
1346 : : /* Only applies to edge-sensitive bits in GINTSTS */
1347 : 0 : FIQ_WRITE(state->dwc_regs_base + GINTSTS, gintsts_handled.d32);
1348 : : }
1349 : :
1350 : : /* We got an interrupt, didn't handle it. */
1351 [ # # ]: 0 : if (kick_irq) {
1352 : 0 : state->mphi_int_count++;
1353 [ # # ]: 0 : if (state->mphi_regs.swirq_set) {
1354 : 0 : FIQ_WRITE(state->mphi_regs.swirq_set, 1);
1355 : : } else {
1356 : 0 : FIQ_WRITE(state->mphi_regs.outdda, state->dummy_send_dma);
1357 : 0 : FIQ_WRITE(state->mphi_regs.outddb, (1<<29));
1358 : : }
1359 : :
1360 : : }
1361 : 0 : state->fiq_done++;
1362 : 0 : mb();
1363 : : fiq_fsm_spin_unlock(&state->lock);
1364 : 0 : }
1365 : :
1366 : :
1367 : : /**
1368 : : * dwc_otg_fiq_nop() - FIQ "lite"
1369 : : * @state: pointer to state struct passed from the banked FIQ mode registers.
1370 : : *
1371 : : * The "nop" handler does not intervene on any interrupts other than SOF.
1372 : : * It is limited in scope to deciding at each SOF if the IRQ SOF handler (which deals
1373 : : * with non-periodic/periodic queues) needs to be kicked.
1374 : : *
1375 : : * This is done to hold off the SOF interrupt, which occurs at a rate of 8000 per second.
1376 : : *
1377 : : * Return: void
1378 : : */
1379 : 282517104 : void notrace dwc_otg_fiq_nop(struct fiq_state *state)
1380 : : {
1381 : : gintsts_data_t gintsts, gintsts_handled;
1382 : : gintmsk_data_t gintmsk;
1383 : : hfnum_data_t hfnum;
1384 : :
1385 : : /* Ensure peripheral reads issued prior to FIQ entry are complete */
1386 : 282517104 : dsb(sy);
1387 : :
1388 : 282517104 : fiq_fsm_spin_lock(&state->lock);
1389 : 282517102 : hfnum.d32 = FIQ_READ(state->dwc_regs_base + HFNUM);
1390 : 282517102 : gintsts.d32 = FIQ_READ(state->dwc_regs_base + GINTSTS);
1391 : 282517102 : gintmsk.d32 = FIQ_READ(state->dwc_regs_base + GINTMSK);
1392 : 282517102 : gintsts.d32 &= gintmsk.d32;
1393 : 282517102 : gintsts_handled.d32 = 0;
1394 : :
1395 [ + + ]: 282517102 : if (gintsts.b.sofintr) {
1396 [ + + + + ]: 123272554 : if (!state->kick_np_queues &&
1397 : 61635804 : dwc_frame_num_gt(state->next_sched_frame, hfnum.b.frnum)) {
1398 : : /* SOF handled, no work to do, just ACK interrupt */
1399 : 11848686 : gintsts_handled.b.sofintr = 1;
1400 : : } else {
1401 : : /* Kick IRQ */
1402 : 49788064 : state->gintmsk_saved.b.sofintr = 0;
1403 : : }
1404 : : }
1405 : :
1406 : : /* Reset handled interrupts */
1407 [ + + ]: 282517102 : if(gintsts_handled.d32) {
1408 : 11848686 : FIQ_WRITE(state->dwc_regs_base + GINTSTS, gintsts_handled.d32);
1409 : : }
1410 : :
1411 : : /* Clear the bits in the saved register that were not handled but were triggered. */
1412 : 282517102 : state->gintmsk_saved.d32 &= ~(gintsts.d32 & ~gintsts_handled.d32);
1413 : :
1414 : : /* We got an interrupt, didn't handle it and want to mask it */
1415 [ + + ]: 282517102 : if (~(state->gintmsk_saved.d32)) {
1416 : 274705666 : state->mphi_int_count++;
1417 : 274705666 : gintmsk.d32 &= state->gintmsk_saved.d32;
1418 : 274705666 : FIQ_WRITE(state->dwc_regs_base + GINTMSK, gintmsk.d32);
1419 [ - + ]: 274705666 : if (state->mphi_regs.swirq_set) {
1420 : 0 : FIQ_WRITE(state->mphi_regs.swirq_set, 1);
1421 : : } else {
1422 : : /* Force a clear before another dummy send */
1423 : 274705666 : FIQ_WRITE(state->mphi_regs.intstat, (1<<29));
1424 : 274705666 : FIQ_WRITE(state->mphi_regs.outdda, state->dummy_send_dma);
1425 : 274705666 : FIQ_WRITE(state->mphi_regs.outddb, (1<<29));
1426 : : }
1427 : : }
1428 : 282517102 : state->fiq_done++;
1429 : 282517102 : mb();
1430 : : fiq_fsm_spin_unlock(&state->lock);
1431 : 282517094 : }
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