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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / dma / edma.c
blob04070baab78ab0cc7772085dd70828741317dd5a
1 /*
2 * TI EDMA DMA engine driver
3 *
4 * Copyright 2012 Texas Instruments
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation version 2.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether express or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16 #include <linux/dmaengine.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/edma.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/interrupt.h>
22 #include <linux/list.h>
23 #include <linux/module.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
26 #include <linux/spinlock.h>
27 #include <linux/of.h>
28 #include <linux/of_dma.h>
29 #include <linux/of_irq.h>
30 #include <linux/of_address.h>
31 #include <linux/of_device.h>
32 #include <linux/pm_runtime.h>
33
34 #include <linux/platform_data/edma.h>
35
36 #include "dmaengine.h"
37 #include "virt-dma.h"
38
39 /* Offsets matching "struct edmacc_param" */
40 #define PARM_OPT 0x00
41 #define PARM_SRC 0x04
42 #define PARM_A_B_CNT 0x08
43 #define PARM_DST 0x0c
44 #define PARM_SRC_DST_BIDX 0x10
45 #define PARM_LINK_BCNTRLD 0x14
46 #define PARM_SRC_DST_CIDX 0x18
47 #define PARM_CCNT 0x1c
48
49 #define PARM_SIZE 0x20
50
51 /* Offsets for EDMA CC global channel registers and their shadows */
52 #define SH_ER 0x00 /* 64 bits */
53 #define SH_ECR 0x08 /* 64 bits */
54 #define SH_ESR 0x10 /* 64 bits */
55 #define SH_CER 0x18 /* 64 bits */
56 #define SH_EER 0x20 /* 64 bits */
57 #define SH_EECR 0x28 /* 64 bits */
58 #define SH_EESR 0x30 /* 64 bits */
59 #define SH_SER 0x38 /* 64 bits */
60 #define SH_SECR 0x40 /* 64 bits */
61 #define SH_IER 0x50 /* 64 bits */
62 #define SH_IECR 0x58 /* 64 bits */
63 #define SH_IESR 0x60 /* 64 bits */
64 #define SH_IPR 0x68 /* 64 bits */
65 #define SH_ICR 0x70 /* 64 bits */
66 #define SH_IEVAL 0x78
67 #define SH_QER 0x80
68 #define SH_QEER 0x84
69 #define SH_QEECR 0x88
70 #define SH_QEESR 0x8c
71 #define SH_QSER 0x90
72 #define SH_QSECR 0x94
73 #define SH_SIZE 0x200
74
75 /* Offsets for EDMA CC global registers */
76 #define EDMA_REV 0x0000
77 #define EDMA_CCCFG 0x0004
78 #define EDMA_QCHMAP 0x0200 /* 8 registers */
79 #define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
80 #define EDMA_QDMAQNUM 0x0260
81 #define EDMA_QUETCMAP 0x0280
82 #define EDMA_QUEPRI 0x0284
83 #define EDMA_EMR 0x0300 /* 64 bits */
84 #define EDMA_EMCR 0x0308 /* 64 bits */
85 #define EDMA_QEMR 0x0310
86 #define EDMA_QEMCR 0x0314
87 #define EDMA_CCERR 0x0318
88 #define EDMA_CCERRCLR 0x031c
89 #define EDMA_EEVAL 0x0320
90 #define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
91 #define EDMA_QRAE 0x0380 /* 4 registers */
92 #define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
93 #define EDMA_QSTAT 0x0600 /* 2 registers */
94 #define EDMA_QWMTHRA 0x0620
95 #define EDMA_QWMTHRB 0x0624
96 #define EDMA_CCSTAT 0x0640
97
98 #define EDMA_M 0x1000 /* global channel registers */
99 #define EDMA_ECR 0x1008
100 #define EDMA_ECRH 0x100C
101 #define EDMA_SHADOW0 0x2000 /* 4 shadow regions */
102 #define EDMA_PARM 0x4000 /* PaRAM entries */
103
104 #define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
105
106 #define EDMA_DCHMAP 0x0100 /* 64 registers */
107
108 /* CCCFG register */
109 #define GET_NUM_DMACH(x) (x & 0x7) /* bits 0-2 */
110 #define GET_NUM_QDMACH(x) ((x & 0x70) >> 4) /* bits 4-6 */
111 #define GET_NUM_PAENTRY(x) ((x & 0x7000) >> 12) /* bits 12-14 */
112 #define GET_NUM_EVQUE(x) ((x & 0x70000) >> 16) /* bits 16-18 */
113 #define GET_NUM_REGN(x) ((x & 0x300000) >> 20) /* bits 20-21 */
114 #define CHMAP_EXIST BIT(24)
115
116 /* CCSTAT register */
117 #define EDMA_CCSTAT_ACTV BIT(4)
118
119 /*
120 * Max of 20 segments per channel to conserve PaRAM slots
121 * Also note that MAX_NR_SG should be atleast the no.of periods
122 * that are required for ASoC, otherwise DMA prep calls will
123 * fail. Today davinci-pcm is the only user of this driver and
124 * requires atleast 17 slots, so we setup the default to 20.
125 */
126 #define MAX_NR_SG 20
127 #define EDMA_MAX_SLOTS MAX_NR_SG
128 #define EDMA_DESCRIPTORS 16
129
130 #define EDMA_CHANNEL_ANY -1 /* for edma_alloc_channel() */
131 #define EDMA_SLOT_ANY -1 /* for edma_alloc_slot() */
132 #define EDMA_CONT_PARAMS_ANY 1001
133 #define EDMA_CONT_PARAMS_FIXED_EXACT 1002
134 #define EDMA_CONT_PARAMS_FIXED_NOT_EXACT 1003
135
136 /* PaRAM slots are laid out like this */
137 struct edmacc_param {
138 u32 opt;
139 u32 src;
140 u32 a_b_cnt;
141 u32 dst;
142 u32 src_dst_bidx;
143 u32 link_bcntrld;
144 u32 src_dst_cidx;
145 u32 ccnt;
146 } __packed;
147
148 /* fields in edmacc_param.opt */
149 #define SAM BIT(0)
150 #define DAM BIT(1)
151 #define SYNCDIM BIT(2)
152 #define STATIC BIT(3)
153 #define EDMA_FWID (0x07 << 8)
154 #define TCCMODE BIT(11)
155 #define EDMA_TCC(t) ((t) << 12)
156 #define TCINTEN BIT(20)
157 #define ITCINTEN BIT(21)
158 #define TCCHEN BIT(22)
159 #define ITCCHEN BIT(23)
160
161 struct edma_pset {
162 u32 len;
163 dma_addr_t addr;
164 struct edmacc_param param;
165 };
166
167 struct edma_desc {
168 struct virt_dma_desc vdesc;
169 struct list_head node;
170 enum dma_transfer_direction direction;
171 int cyclic;
172 int absync;
173 int pset_nr;
174 struct edma_chan *echan;
175 int processed;
176
177 /*
178 * The following 4 elements are used for residue accounting.
179 *
180 * - processed_stat: the number of SG elements we have traversed
181 * so far to cover accounting. This is updated directly to processed
182 * during edma_callback and is always <= processed, because processed
183 * refers to the number of pending transfer (programmed to EDMA
184 * controller), where as processed_stat tracks number of transfers
185 * accounted for so far.
186 *
187 * - residue: The amount of bytes we have left to transfer for this desc
188 *
189 * - residue_stat: The residue in bytes of data we have covered
190 * so far for accounting. This is updated directly to residue
191 * during callbacks to keep it current.
192 *
193 * - sg_len: Tracks the length of the current intermediate transfer,
194 * this is required to update the residue during intermediate transfer
195 * completion callback.
196 */
197 int processed_stat;
198 u32 sg_len;
199 u32 residue;
200 u32 residue_stat;
201
202 struct edma_pset pset[0];
203 };
204
205 struct edma_cc;
206
207 struct edma_tc {
208 struct device_node *node;
209 u16 id;
210 };
211
212 struct edma_chan {
213 struct virt_dma_chan vchan;
214 struct list_head node;
215 struct edma_desc *edesc;
216 struct edma_cc *ecc;
217 struct edma_tc *tc;
218 int ch_num;
219 bool alloced;
220 bool hw_triggered;
221 int slot[EDMA_MAX_SLOTS];
222 int missed;
223 struct dma_slave_config cfg;
224 };
225
226 struct edma_cc {
227 struct device *dev;
228 struct edma_soc_info *info;
229 void __iomem *base;
230 int id;
231 bool legacy_mode;
232
233 /* eDMA3 resource information */
234 unsigned num_channels;
235 unsigned num_qchannels;
236 unsigned num_region;
237 unsigned num_slots;
238 unsigned num_tc;
239 bool chmap_exist;
240 enum dma_event_q default_queue;
241
242 /*
243 * The slot_inuse bit for each PaRAM slot is clear unless the slot is
244 * in use by Linux or if it is allocated to be used by DSP.
245 */
246 unsigned long *slot_inuse;
247
248 struct dma_device dma_slave;
249 struct dma_device *dma_memcpy;
250 struct edma_chan *slave_chans;
251 struct edma_tc *tc_list;
252 int dummy_slot;
253 };
254
255 /* dummy param set used to (re)initialize parameter RAM slots */
256 static const struct edmacc_param dummy_paramset = {
257 .link_bcntrld = 0xffff,
258 .ccnt = 1,
259 };
260
261 #define EDMA_BINDING_LEGACY 0
262 #define EDMA_BINDING_TPCC 1
263 static const struct of_device_id edma_of_ids[] = {
264 {
265 .compatible = "ti,edma3",
266 .data = (void *)EDMA_BINDING_LEGACY,
267 },
268 {
269 .compatible = "ti,edma3-tpcc",
270 .data = (void *)EDMA_BINDING_TPCC,
271 },
272 {}
273 };
274
275 static const struct of_device_id edma_tptc_of_ids[] = {
276 { .compatible = "ti,edma3-tptc", },
277 {}
278 };
279
280 static inline unsigned int edma_read(struct edma_cc *ecc, int offset)
281 {
282 return (unsigned int)__raw_readl(ecc->base + offset);
283 }
284
285 static inline void edma_write(struct edma_cc *ecc, int offset, int val)
286 {
287 __raw_writel(val, ecc->base + offset);
288 }
289
290 static inline void edma_modify(struct edma_cc *ecc, int offset, unsigned and,
291 unsigned or)
292 {
293 unsigned val = edma_read(ecc, offset);
294
295 val &= and;
296 val |= or;
297 edma_write(ecc, offset, val);
298 }
299
300 static inline void edma_and(struct edma_cc *ecc, int offset, unsigned and)
301 {
302 unsigned val = edma_read(ecc, offset);
303
304 val &= and;
305 edma_write(ecc, offset, val);
306 }
307
308 static inline void edma_or(struct edma_cc *ecc, int offset, unsigned or)
309 {
310 unsigned val = edma_read(ecc, offset);
311
312 val |= or;
313 edma_write(ecc, offset, val);
314 }
315
316 static inline unsigned int edma_read_array(struct edma_cc *ecc, int offset,
317 int i)
318 {
319 return edma_read(ecc, offset + (i << 2));
320 }
321
322 static inline void edma_write_array(struct edma_cc *ecc, int offset, int i,
323 unsigned val)
324 {
325 edma_write(ecc, offset + (i << 2), val);
326 }
327
328 static inline void edma_modify_array(struct edma_cc *ecc, int offset, int i,
329 unsigned and, unsigned or)
330 {
331 edma_modify(ecc, offset + (i << 2), and, or);
332 }
333
334 static inline void edma_or_array(struct edma_cc *ecc, int offset, int i,
335 unsigned or)
336 {
337 edma_or(ecc, offset + (i << 2), or);
338 }
339
340 static inline void edma_or_array2(struct edma_cc *ecc, int offset, int i, int j,
341 unsigned or)
342 {
343 edma_or(ecc, offset + ((i * 2 + j) << 2), or);
344 }
345
346 static inline void edma_write_array2(struct edma_cc *ecc, int offset, int i,
347 int j, unsigned val)
348 {
349 edma_write(ecc, offset + ((i * 2 + j) << 2), val);
350 }
351
352 static inline unsigned int edma_shadow0_read(struct edma_cc *ecc, int offset)
353 {
354 return edma_read(ecc, EDMA_SHADOW0 + offset);
355 }
356
357 static inline unsigned int edma_shadow0_read_array(struct edma_cc *ecc,
358 int offset, int i)
359 {
360 return edma_read(ecc, EDMA_SHADOW0 + offset + (i << 2));
361 }
362
363 static inline void edma_shadow0_write(struct edma_cc *ecc, int offset,
364 unsigned val)
365 {
366 edma_write(ecc, EDMA_SHADOW0 + offset, val);
367 }
368
369 static inline void edma_shadow0_write_array(struct edma_cc *ecc, int offset,
370 int i, unsigned val)
371 {
372 edma_write(ecc, EDMA_SHADOW0 + offset + (i << 2), val);
373 }
374
375 static inline unsigned int edma_param_read(struct edma_cc *ecc, int offset,
376 int param_no)
377 {
378 return edma_read(ecc, EDMA_PARM + offset + (param_no << 5));
379 }
380
381 static inline void edma_param_write(struct edma_cc *ecc, int offset,
382 int param_no, unsigned val)
383 {
384 edma_write(ecc, EDMA_PARM + offset + (param_no << 5), val);
385 }
386
387 static inline void edma_param_modify(struct edma_cc *ecc, int offset,
388 int param_no, unsigned and, unsigned or)
389 {
390 edma_modify(ecc, EDMA_PARM + offset + (param_no << 5), and, or);
391 }
392
393 static inline void edma_param_and(struct edma_cc *ecc, int offset, int param_no,
394 unsigned and)
395 {
396 edma_and(ecc, EDMA_PARM + offset + (param_no << 5), and);
397 }
398
399 static inline void edma_param_or(struct edma_cc *ecc, int offset, int param_no,
400 unsigned or)
401 {
402 edma_or(ecc, EDMA_PARM + offset + (param_no << 5), or);
403 }
404
405 static inline void set_bits(int offset, int len, unsigned long *p)
406 {
407 for (; len > 0; len--)
408 set_bit(offset + (len - 1), p);
409 }
410
411 static inline void clear_bits(int offset, int len, unsigned long *p)
412 {
413 for (; len > 0; len--)
414 clear_bit(offset + (len - 1), p);
415 }
416
417 static void edma_assign_priority_to_queue(struct edma_cc *ecc, int queue_no,
418 int priority)
419 {
420 int bit = queue_no * 4;
421
422 edma_modify(ecc, EDMA_QUEPRI, ~(0x7 << bit), ((priority & 0x7) << bit));
423 }
424
425 static void edma_set_chmap(struct edma_chan *echan, int slot)
426 {
427 struct edma_cc *ecc = echan->ecc;
428 int channel = EDMA_CHAN_SLOT(echan->ch_num);
429
430 if (ecc->chmap_exist) {
431 slot = EDMA_CHAN_SLOT(slot);
432 edma_write_array(ecc, EDMA_DCHMAP, channel, (slot << 5));
433 }
434 }
435
436 static void edma_setup_interrupt(struct edma_chan *echan, bool enable)
437 {
438 struct edma_cc *ecc = echan->ecc;
439 int channel = EDMA_CHAN_SLOT(echan->ch_num);
440
441 if (enable) {
442 edma_shadow0_write_array(ecc, SH_ICR, channel >> 5,
443 BIT(channel & 0x1f));
444 edma_shadow0_write_array(ecc, SH_IESR, channel >> 5,
445 BIT(channel & 0x1f));
446 } else {
447 edma_shadow0_write_array(ecc, SH_IECR, channel >> 5,
448 BIT(channel & 0x1f));
449 }
450 }
451
452 /*
453 * paRAM slot management functions
454 */
455 static void edma_write_slot(struct edma_cc *ecc, unsigned slot,
456 const struct edmacc_param *param)
457 {
458 slot = EDMA_CHAN_SLOT(slot);
459 if (slot >= ecc->num_slots)
460 return;
461 memcpy_toio(ecc->base + PARM_OFFSET(slot), param, PARM_SIZE);
462 }
463
464 static void edma_read_slot(struct edma_cc *ecc, unsigned slot,
465 struct edmacc_param *param)
466 {
467 slot = EDMA_CHAN_SLOT(slot);
468 if (slot >= ecc->num_slots)
469 return;
470 memcpy_fromio(param, ecc->base + PARM_OFFSET(slot), PARM_SIZE);
471 }
472
473 /**
474 * edma_alloc_slot - allocate DMA parameter RAM
475 * @ecc: pointer to edma_cc struct
476 * @slot: specific slot to allocate; negative for "any unused slot"
477 *
478 * This allocates a parameter RAM slot, initializing it to hold a
479 * dummy transfer. Slots allocated using this routine have not been
480 * mapped to a hardware DMA channel, and will normally be used by
481 * linking to them from a slot associated with a DMA channel.
482 *
483 * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
484 * slots may be allocated on behalf of DSP firmware.
485 *
486 * Returns the number of the slot, else negative errno.
487 */
488 static int edma_alloc_slot(struct edma_cc *ecc, int slot)
489 {
490 if (slot >= 0) {
491 slot = EDMA_CHAN_SLOT(slot);
492 /* Requesting entry paRAM slot for a HW triggered channel. */
493 if (ecc->chmap_exist && slot < ecc->num_channels)
494 slot = EDMA_SLOT_ANY;
495 }
496
497 if (slot < 0) {
498 if (ecc->chmap_exist)
499 slot = 0;
500 else
501 slot = ecc->num_channels;
502 for (;;) {
503 slot = find_next_zero_bit(ecc->slot_inuse,
504 ecc->num_slots,
505 slot);
506 if (slot == ecc->num_slots)
507 return -ENOMEM;
508 if (!test_and_set_bit(slot, ecc->slot_inuse))
509 break;
510 }
511 } else if (slot >= ecc->num_slots) {
512 return -EINVAL;
513 } else if (test_and_set_bit(slot, ecc->slot_inuse)) {
514 return -EBUSY;
515 }
516
517 edma_write_slot(ecc, slot, &dummy_paramset);
518
519 return EDMA_CTLR_CHAN(ecc->id, slot);
520 }
521
522 static void edma_free_slot(struct edma_cc *ecc, unsigned slot)
523 {
524 slot = EDMA_CHAN_SLOT(slot);
525 if (slot >= ecc->num_slots)
526 return;
527
528 edma_write_slot(ecc, slot, &dummy_paramset);
529 clear_bit(slot, ecc->slot_inuse);
530 }
531
532 /**
533 * edma_link - link one parameter RAM slot to another
534 * @ecc: pointer to edma_cc struct
535 * @from: parameter RAM slot originating the link
536 * @to: parameter RAM slot which is the link target
537 *
538 * The originating slot should not be part of any active DMA transfer.
539 */
540 static void edma_link(struct edma_cc *ecc, unsigned from, unsigned to)
541 {
542 if (unlikely(EDMA_CTLR(from) != EDMA_CTLR(to)))
543 dev_warn(ecc->dev, "Ignoring eDMA instance for linking\n");
544
545 from = EDMA_CHAN_SLOT(from);
546 to = EDMA_CHAN_SLOT(to);
547 if (from >= ecc->num_slots || to >= ecc->num_slots)
548 return;
549
550 edma_param_modify(ecc, PARM_LINK_BCNTRLD, from, 0xffff0000,
551 PARM_OFFSET(to));
552 }
553
554 /**
555 * edma_get_position - returns the current transfer point
556 * @ecc: pointer to edma_cc struct
557 * @slot: parameter RAM slot being examined
558 * @dst: true selects the dest position, false the source
559 *
560 * Returns the position of the current active slot
561 */
562 static dma_addr_t edma_get_position(struct edma_cc *ecc, unsigned slot,
563 bool dst)
564 {
565 u32 offs;
566
567 slot = EDMA_CHAN_SLOT(slot);
568 offs = PARM_OFFSET(slot);
569 offs += dst ? PARM_DST : PARM_SRC;
570
571 return edma_read(ecc, offs);
572 }
573
574 /*
575 * Channels with event associations will be triggered by their hardware
576 * events, and channels without such associations will be triggered by
577 * software. (At this writing there is no interface for using software
578 * triggers except with channels that don't support hardware triggers.)
579 */
580 static void edma_start(struct edma_chan *echan)
581 {
582 struct edma_cc *ecc = echan->ecc;
583 int channel = EDMA_CHAN_SLOT(echan->ch_num);
584 int j = (channel >> 5);
585 unsigned int mask = BIT(channel & 0x1f);
586
587 if (!echan->hw_triggered) {
588 /* EDMA channels without event association */
589 dev_dbg(ecc->dev, "ESR%d %08x\n", j,
590 edma_shadow0_read_array(ecc, SH_ESR, j));
591 edma_shadow0_write_array(ecc, SH_ESR, j, mask);
592 } else {
593 /* EDMA channel with event association */
594 dev_dbg(ecc->dev, "ER%d %08x\n", j,
595 edma_shadow0_read_array(ecc, SH_ER, j));
596 /* Clear any pending event or error */
597 edma_write_array(ecc, EDMA_ECR, j, mask);
598 edma_write_array(ecc, EDMA_EMCR, j, mask);
599 /* Clear any SER */
600 edma_shadow0_write_array(ecc, SH_SECR, j, mask);
601 edma_shadow0_write_array(ecc, SH_EESR, j, mask);
602 dev_dbg(ecc->dev, "EER%d %08x\n", j,
603 edma_shadow0_read_array(ecc, SH_EER, j));
604 }
605 }
606
607 static void edma_stop(struct edma_chan *echan)
608 {
609 struct edma_cc *ecc = echan->ecc;
610 int channel = EDMA_CHAN_SLOT(echan->ch_num);
611 int j = (channel >> 5);
612 unsigned int mask = BIT(channel & 0x1f);
613
614 edma_shadow0_write_array(ecc, SH_EECR, j, mask);
615 edma_shadow0_write_array(ecc, SH_ECR, j, mask);
616 edma_shadow0_write_array(ecc, SH_SECR, j, mask);
617 edma_write_array(ecc, EDMA_EMCR, j, mask);
618
619 /* clear possibly pending completion interrupt */
620 edma_shadow0_write_array(ecc, SH_ICR, j, mask);
621
622 dev_dbg(ecc->dev, "EER%d %08x\n", j,
623 edma_shadow0_read_array(ecc, SH_EER, j));
624
625 /* REVISIT: consider guarding against inappropriate event
626 * chaining by overwriting with dummy_paramset.
627 */
628 }
629
630 /*
631 * Temporarily disable EDMA hardware events on the specified channel,
632 * preventing them from triggering new transfers
633 */
634 static void edma_pause(struct edma_chan *echan)
635 {
636 int channel = EDMA_CHAN_SLOT(echan->ch_num);
637 unsigned int mask = BIT(channel & 0x1f);
638
639 edma_shadow0_write_array(echan->ecc, SH_EECR, channel >> 5, mask);
640 }
641
642 /* Re-enable EDMA hardware events on the specified channel. */
643 static void edma_resume(struct edma_chan *echan)
644 {
645 int channel = EDMA_CHAN_SLOT(echan->ch_num);
646 unsigned int mask = BIT(channel & 0x1f);
647
648 edma_shadow0_write_array(echan->ecc, SH_EESR, channel >> 5, mask);
649 }
650
651 static void edma_trigger_channel(struct edma_chan *echan)
652 {
653 struct edma_cc *ecc = echan->ecc;
654 int channel = EDMA_CHAN_SLOT(echan->ch_num);
655 unsigned int mask = BIT(channel & 0x1f);
656
657 edma_shadow0_write_array(ecc, SH_ESR, (channel >> 5), mask);
658
659 dev_dbg(ecc->dev, "ESR%d %08x\n", (channel >> 5),
660 edma_shadow0_read_array(ecc, SH_ESR, (channel >> 5)));
661 }
662
663 static void edma_clean_channel(struct edma_chan *echan)
664 {
665 struct edma_cc *ecc = echan->ecc;
666 int channel = EDMA_CHAN_SLOT(echan->ch_num);
667 int j = (channel >> 5);
668 unsigned int mask = BIT(channel & 0x1f);
669
670 dev_dbg(ecc->dev, "EMR%d %08x\n", j, edma_read_array(ecc, EDMA_EMR, j));
671 edma_shadow0_write_array(ecc, SH_ECR, j, mask);
672 /* Clear the corresponding EMR bits */
673 edma_write_array(ecc, EDMA_EMCR, j, mask);
674 /* Clear any SER */
675 edma_shadow0_write_array(ecc, SH_SECR, j, mask);
676 edma_write(ecc, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
677 }
678
679 /* Move channel to a specific event queue */
680 static void edma_assign_channel_eventq(struct edma_chan *echan,
681 enum dma_event_q eventq_no)
682 {
683 struct edma_cc *ecc = echan->ecc;
684 int channel = EDMA_CHAN_SLOT(echan->ch_num);
685 int bit = (channel & 0x7) * 4;
686
687 /* default to low priority queue */
688 if (eventq_no == EVENTQ_DEFAULT)
689 eventq_no = ecc->default_queue;
690 if (eventq_no >= ecc->num_tc)
691 return;
692
693 eventq_no &= 7;
694 edma_modify_array(ecc, EDMA_DMAQNUM, (channel >> 3), ~(0x7 << bit),
695 eventq_no << bit);
696 }
697
698 static int edma_alloc_channel(struct edma_chan *echan,
699 enum dma_event_q eventq_no)
700 {
701 struct edma_cc *ecc = echan->ecc;
702 int channel = EDMA_CHAN_SLOT(echan->ch_num);
703
704 /* ensure access through shadow region 0 */
705 edma_or_array2(ecc, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
706
707 /* ensure no events are pending */
708 edma_stop(echan);
709
710 edma_setup_interrupt(echan, true);
711
712 edma_assign_channel_eventq(echan, eventq_no);
713
714 return 0;
715 }
716
717 static void edma_free_channel(struct edma_chan *echan)
718 {
719 /* ensure no events are pending */
720 edma_stop(echan);
721 /* REVISIT should probably take out of shadow region 0 */
722 edma_setup_interrupt(echan, false);
723 }
724
725 static inline struct edma_cc *to_edma_cc(struct dma_device *d)
726 {
727 return container_of(d, struct edma_cc, dma_slave);
728 }
729
730 static inline struct edma_chan *to_edma_chan(struct dma_chan *c)
731 {
732 return container_of(c, struct edma_chan, vchan.chan);
733 }
734
735 static inline struct edma_desc *to_edma_desc(struct dma_async_tx_descriptor *tx)
736 {
737 return container_of(tx, struct edma_desc, vdesc.tx);
738 }
739
740 static void edma_desc_free(struct virt_dma_desc *vdesc)
741 {
742 kfree(container_of(vdesc, struct edma_desc, vdesc));
743 }
744
745 /* Dispatch a queued descriptor to the controller (caller holds lock) */
746 static void edma_execute(struct edma_chan *echan)
747 {
748 struct edma_cc *ecc = echan->ecc;
749 struct virt_dma_desc *vdesc;
750 struct edma_desc *edesc;
751 struct device *dev = echan->vchan.chan.device->dev;
752 int i, j, left, nslots;
753
754 if (!echan->edesc) {
755 /* Setup is needed for the first transfer */
756 vdesc = vchan_next_desc(&echan->vchan);
757 if (!vdesc)
758 return;
759 list_del(&vdesc->node);
760 echan->edesc = to_edma_desc(&vdesc->tx);
761 }
762
763 edesc = echan->edesc;
764
765 /* Find out how many left */
766 left = edesc->pset_nr - edesc->processed;
767 nslots = min(MAX_NR_SG, left);
768 edesc->sg_len = 0;
769
770 /* Write descriptor PaRAM set(s) */
771 for (i = 0; i < nslots; i++) {
772 j = i + edesc->processed;
773 edma_write_slot(ecc, echan->slot[i], &edesc->pset[j].param);
774 edesc->sg_len += edesc->pset[j].len;
775 dev_vdbg(dev,
776 "\n pset[%d]:\n"
777 " chnum\t%d\n"
778 " slot\t%d\n"
779 " opt\t%08x\n"
780 " src\t%08x\n"
781 " dst\t%08x\n"
782 " abcnt\t%08x\n"
783 " ccnt\t%08x\n"
784 " bidx\t%08x\n"
785 " cidx\t%08x\n"
786 " lkrld\t%08x\n",
787 j, echan->ch_num, echan->slot[i],
788 edesc->pset[j].param.opt,
789 edesc->pset[j].param.src,
790 edesc->pset[j].param.dst,
791 edesc->pset[j].param.a_b_cnt,
792 edesc->pset[j].param.ccnt,
793 edesc->pset[j].param.src_dst_bidx,
794 edesc->pset[j].param.src_dst_cidx,
795 edesc->pset[j].param.link_bcntrld);
796 /* Link to the previous slot if not the last set */
797 if (i != (nslots - 1))
798 edma_link(ecc, echan->slot[i], echan->slot[i + 1]);
799 }
800
801 edesc->processed += nslots;
802
803 /*
804 * If this is either the last set in a set of SG-list transactions
805 * then setup a link to the dummy slot, this results in all future
806 * events being absorbed and that's OK because we're done
807 */
808 if (edesc->processed == edesc->pset_nr) {
809 if (edesc->cyclic)
810 edma_link(ecc, echan->slot[nslots - 1], echan->slot[1]);
811 else
812 edma_link(ecc, echan->slot[nslots - 1],
813 echan->ecc->dummy_slot);
814 }
815
816 if (echan->missed) {
817 /*
818 * This happens due to setup times between intermediate
819 * transfers in long SG lists which have to be broken up into
820 * transfers of MAX_NR_SG
821 */
822 dev_dbg(dev, "missed event on channel %d\n", echan->ch_num);
823 edma_clean_channel(echan);
824 edma_stop(echan);
825 edma_start(echan);
826 edma_trigger_channel(echan);
827 echan->missed = 0;
828 } else if (edesc->processed <= MAX_NR_SG) {
829 dev_dbg(dev, "first transfer starting on channel %d\n",
830 echan->ch_num);
831 edma_start(echan);
832 } else {
833 dev_dbg(dev, "chan: %d: completed %d elements, resuming\n",
834 echan->ch_num, edesc->processed);
835 edma_resume(echan);
836 }
837 }
838
839 static int edma_terminate_all(struct dma_chan *chan)
840 {
841 struct edma_chan *echan = to_edma_chan(chan);
842 unsigned long flags;
843 LIST_HEAD(head);
844
845 spin_lock_irqsave(&echan->vchan.lock, flags);
846
847 /*
848 * Stop DMA activity: we assume the callback will not be called
849 * after edma_dma() returns (even if it does, it will see
850 * echan->edesc is NULL and exit.)
851 */
852 if (echan->edesc) {
853 edma_stop(echan);
854 /* Move the cyclic channel back to default queue */
855 if (!echan->tc && echan->edesc->cyclic)
856 edma_assign_channel_eventq(echan, EVENTQ_DEFAULT);
857 /*
858 * free the running request descriptor
859 * since it is not in any of the vdesc lists
860 */
861 edma_desc_free(&echan->edesc->vdesc);
862 echan->edesc = NULL;
863 }
864
865 vchan_get_all_descriptors(&echan->vchan, &head);
866 spin_unlock_irqrestore(&echan->vchan.lock, flags);
867 vchan_dma_desc_free_list(&echan->vchan, &head);
868
869 return 0;
870 }
871
872 static void edma_synchronize(struct dma_chan *chan)
873 {
874 struct edma_chan *echan = to_edma_chan(chan);
875
876 vchan_synchronize(&echan->vchan);
877 }
878
879 static int edma_slave_config(struct dma_chan *chan,
880 struct dma_slave_config *cfg)
881 {
882 struct edma_chan *echan = to_edma_chan(chan);
883
884 if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
885 cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
886 return -EINVAL;
887
888 memcpy(&echan->cfg, cfg, sizeof(echan->cfg));
889
890 return 0;
891 }
892
893 static int edma_dma_pause(struct dma_chan *chan)
894 {
895 struct edma_chan *echan = to_edma_chan(chan);
896
897 if (!echan->edesc)
898 return -EINVAL;
899
900 edma_pause(echan);
901 return 0;
902 }
903
904 static int edma_dma_resume(struct dma_chan *chan)
905 {
906 struct edma_chan *echan = to_edma_chan(chan);
907
908 edma_resume(echan);
909 return 0;
910 }
911
912 /*
913 * A PaRAM set configuration abstraction used by other modes
914 * @chan: Channel who's PaRAM set we're configuring
915 * @pset: PaRAM set to initialize and setup.
916 * @src_addr: Source address of the DMA
917 * @dst_addr: Destination address of the DMA
918 * @burst: In units of dev_width, how much to send
919 * @dev_width: How much is the dev_width
920 * @dma_length: Total length of the DMA transfer
921 * @direction: Direction of the transfer
922 */
923 static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset,
924 dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst,
925 unsigned int acnt, unsigned int dma_length,
926 enum dma_transfer_direction direction)
927 {
928 struct edma_chan *echan = to_edma_chan(chan);
929 struct device *dev = chan->device->dev;
930 struct edmacc_param *param = &epset->param;
931 int bcnt, ccnt, cidx;
932 int src_bidx, dst_bidx, src_cidx, dst_cidx;
933 int absync;
934
935 /* src/dst_maxburst == 0 is the same case as src/dst_maxburst == 1 */
936 if (!burst)
937 burst = 1;
938 /*
939 * If the maxburst is equal to the fifo width, use
940 * A-synced transfers. This allows for large contiguous
941 * buffer transfers using only one PaRAM set.
942 */
943 if (burst == 1) {
944 /*
945 * For the A-sync case, bcnt and ccnt are the remainder
946 * and quotient respectively of the division of:
947 * (dma_length / acnt) by (SZ_64K -1). This is so
948 * that in case bcnt over flows, we have ccnt to use.
949 * Note: In A-sync tranfer only, bcntrld is used, but it
950 * only applies for sg_dma_len(sg) >= SZ_64K.
951 * In this case, the best way adopted is- bccnt for the
952 * first frame will be the remainder below. Then for
953 * every successive frame, bcnt will be SZ_64K-1. This
954 * is assured as bcntrld = 0xffff in end of function.
955 */
956 absync = false;
957 ccnt = dma_length / acnt / (SZ_64K - 1);
958 bcnt = dma_length / acnt - ccnt * (SZ_64K - 1);
959 /*
960 * If bcnt is non-zero, we have a remainder and hence an
961 * extra frame to transfer, so increment ccnt.
962 */
963 if (bcnt)
964 ccnt++;
965 else
966 bcnt = SZ_64K - 1;
967 cidx = acnt;
968 } else {
969 /*
970 * If maxburst is greater than the fifo address_width,
971 * use AB-synced transfers where A count is the fifo
972 * address_width and B count is the maxburst. In this
973 * case, we are limited to transfers of C count frames
974 * of (address_width * maxburst) where C count is limited
975 * to SZ_64K-1. This places an upper bound on the length
976 * of an SG segment that can be handled.
977 */
978 absync = true;
979 bcnt = burst;
980 ccnt = dma_length / (acnt * bcnt);
981 if (ccnt > (SZ_64K - 1)) {
982 dev_err(dev, "Exceeded max SG segment size\n");
983 return -EINVAL;
984 }
985 cidx = acnt * bcnt;
986 }
987
988 epset->len = dma_length;
989
990 if (direction == DMA_MEM_TO_DEV) {
991 src_bidx = acnt;
992 src_cidx = cidx;
993 dst_bidx = 0;
994 dst_cidx = 0;
995 epset->addr = src_addr;
996 } else if (direction == DMA_DEV_TO_MEM) {
997 src_bidx = 0;
998 src_cidx = 0;
999 dst_bidx = acnt;
1000 dst_cidx = cidx;
1001 epset->addr = dst_addr;
1002 } else if (direction == DMA_MEM_TO_MEM) {
1003 src_bidx = acnt;
1004 src_cidx = cidx;
1005 dst_bidx = acnt;
1006 dst_cidx = cidx;
1007 } else {
1008 dev_err(dev, "%s: direction not implemented yet\n", __func__);
1009 return -EINVAL;
1010 }
1011
1012 param->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num));
1013 /* Configure A or AB synchronized transfers */
1014 if (absync)
1015 param->opt |= SYNCDIM;
1016
1017 param->src = src_addr;
1018 param->dst = dst_addr;
1019
1020 param->src_dst_bidx = (dst_bidx << 16) | src_bidx;
1021 param->src_dst_cidx = (dst_cidx << 16) | src_cidx;
1022
1023 param->a_b_cnt = bcnt << 16 | acnt;
1024 param->ccnt = ccnt;
1025 /*
1026 * Only time when (bcntrld) auto reload is required is for
1027 * A-sync case, and in this case, a requirement of reload value
1028 * of SZ_64K-1 only is assured. 'link' is initially set to NULL
1029 * and then later will be populated by edma_execute.
1030 */
1031 param->link_bcntrld = 0xffffffff;
1032 return absync;
1033 }
1034
1035 static struct dma_async_tx_descriptor *edma_prep_slave_sg(
1036 struct dma_chan *chan, struct scatterlist *sgl,
1037 unsigned int sg_len, enum dma_transfer_direction direction,
1038 unsigned long tx_flags, void *context)
1039 {
1040 struct edma_chan *echan = to_edma_chan(chan);
1041 struct device *dev = chan->device->dev;
1042 struct edma_desc *edesc;
1043 dma_addr_t src_addr = 0, dst_addr = 0;
1044 enum dma_slave_buswidth dev_width;
1045 u32 burst;
1046 struct scatterlist *sg;
1047 int i, nslots, ret;
1048
1049 if (unlikely(!echan || !sgl || !sg_len))
1050 return NULL;
1051
1052 if (direction == DMA_DEV_TO_MEM) {
1053 src_addr = echan->cfg.src_addr;
1054 dev_width = echan->cfg.src_addr_width;
1055 burst = echan->cfg.src_maxburst;
1056 } else if (direction == DMA_MEM_TO_DEV) {
1057 dst_addr = echan->cfg.dst_addr;
1058 dev_width = echan->cfg.dst_addr_width;
1059 burst = echan->cfg.dst_maxburst;
1060 } else {
1061 dev_err(dev, "%s: bad direction: %d\n", __func__, direction);
1062 return NULL;
1063 }
1064
1065 if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
1066 dev_err(dev, "%s: Undefined slave buswidth\n", __func__);
1067 return NULL;
1068 }
1069
1070 edesc = kzalloc(sizeof(*edesc) + sg_len * sizeof(edesc->pset[0]),
1071 GFP_ATOMIC);
1072 if (!edesc) {
1073 dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__);
1074 return NULL;
1075 }
1076
1077 edesc->pset_nr = sg_len;
1078 edesc->residue = 0;
1079 edesc->direction = direction;
1080 edesc->echan = echan;
1081
1082 /* Allocate a PaRAM slot, if needed */
1083 nslots = min_t(unsigned, MAX_NR_SG, sg_len);
1084
1085 for (i = 0; i < nslots; i++) {
1086 if (echan->slot[i] < 0) {
1087 echan->slot[i] =
1088 edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
1089 if (echan->slot[i] < 0) {
1090 kfree(edesc);
1091 dev_err(dev, "%s: Failed to allocate slot\n",
1092 __func__);
1093 return NULL;
1094 }
1095 }
1096 }
1097
1098 /* Configure PaRAM sets for each SG */
1099 for_each_sg(sgl, sg, sg_len, i) {
1100 /* Get address for each SG */
1101 if (direction == DMA_DEV_TO_MEM)
1102 dst_addr = sg_dma_address(sg);
1103 else
1104 src_addr = sg_dma_address(sg);
1105
1106 ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
1107 dst_addr, burst, dev_width,
1108 sg_dma_len(sg), direction);
1109 if (ret < 0) {
1110 kfree(edesc);
1111 return NULL;
1112 }
1113
1114 edesc->absync = ret;
1115 edesc->residue += sg_dma_len(sg);
1116
1117 /* If this is the last in a current SG set of transactions,
1118 enable interrupts so that next set is processed */
1119 if (!((i+1) % MAX_NR_SG))
1120 edesc->pset[i].param.opt |= TCINTEN;
1121
1122 /* If this is the last set, enable completion interrupt flag */
1123 if (i == sg_len - 1)
1124 edesc->pset[i].param.opt |= TCINTEN;
1125 }
1126 edesc->residue_stat = edesc->residue;
1127
1128 return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1129 }
1130
1131 static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
1132 struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1133 size_t len, unsigned long tx_flags)
1134 {
1135 int ret, nslots;
1136 struct edma_desc *edesc;
1137 struct device *dev = chan->device->dev;
1138 struct edma_chan *echan = to_edma_chan(chan);
1139 unsigned int width, pset_len;
1140
1141 if (unlikely(!echan || !len))
1142 return NULL;
1143
1144 if (len < SZ_64K) {
1145 /*
1146 * Transfer size less than 64K can be handled with one paRAM
1147 * slot and with one burst.
1148 * ACNT = length
1149 */
1150 width = len;
1151 pset_len = len;
1152 nslots = 1;
1153 } else {
1154 /*
1155 * Transfer size bigger than 64K will be handled with maximum of
1156 * two paRAM slots.
1157 * slot1: (full_length / 32767) times 32767 bytes bursts.
1158 * ACNT = 32767, length1: (full_length / 32767) * 32767
1159 * slot2: the remaining amount of data after slot1.
1160 * ACNT = full_length - length1, length2 = ACNT
1161 *
1162 * When the full_length is multibple of 32767 one slot can be
1163 * used to complete the transfer.
1164 */
1165 width = SZ_32K - 1;
1166 pset_len = rounddown(len, width);
1167 /* One slot is enough for lengths multiple of (SZ_32K -1) */
1168 if (unlikely(pset_len == len))
1169 nslots = 1;
1170 else
1171 nslots = 2;
1172 }
1173
1174 edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
1175 GFP_ATOMIC);
1176 if (!edesc) {
1177 dev_dbg(dev, "Failed to allocate a descriptor\n");
1178 return NULL;
1179 }
1180
1181 edesc->pset_nr = nslots;
1182 edesc->residue = edesc->residue_stat = len;
1183 edesc->direction = DMA_MEM_TO_MEM;
1184 edesc->echan = echan;
1185
1186 ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1,
1187 width, pset_len, DMA_MEM_TO_MEM);
1188 if (ret < 0) {
1189 kfree(edesc);
1190 return NULL;
1191 }
1192
1193 edesc->absync = ret;
1194
1195 edesc->pset[0].param.opt |= ITCCHEN;
1196 if (nslots == 1) {
1197 /* Enable transfer complete interrupt */
1198 edesc->pset[0].param.opt |= TCINTEN;
1199 } else {
1200 /* Enable transfer complete chaining for the first slot */
1201 edesc->pset[0].param.opt |= TCCHEN;
1202
1203 if (echan->slot[1] < 0) {
1204 echan->slot[1] = edma_alloc_slot(echan->ecc,
1205 EDMA_SLOT_ANY);
1206 if (echan->slot[1] < 0) {
1207 kfree(edesc);
1208 dev_err(dev, "%s: Failed to allocate slot\n",
1209 __func__);
1210 return NULL;
1211 }
1212 }
1213 dest += pset_len;
1214 src += pset_len;
1215 pset_len = width = len % (SZ_32K - 1);
1216
1217 ret = edma_config_pset(chan, &edesc->pset[1], src, dest, 1,
1218 width, pset_len, DMA_MEM_TO_MEM);
1219 if (ret < 0) {
1220 kfree(edesc);
1221 return NULL;
1222 }
1223
1224 edesc->pset[1].param.opt |= ITCCHEN;
1225 edesc->pset[1].param.opt |= TCINTEN;
1226 }
1227
1228 return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1229 }
1230
1231 static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
1232 struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
1233 size_t period_len, enum dma_transfer_direction direction,
1234 unsigned long tx_flags)
1235 {
1236 struct edma_chan *echan = to_edma_chan(chan);
1237 struct device *dev = chan->device->dev;
1238 struct edma_desc *edesc;
1239 dma_addr_t src_addr, dst_addr;
1240 enum dma_slave_buswidth dev_width;
1241 bool use_intermediate = false;
1242 u32 burst;
1243 int i, ret, nslots;
1244
1245 if (unlikely(!echan || !buf_len || !period_len))
1246 return NULL;
1247
1248 if (direction == DMA_DEV_TO_MEM) {
1249 src_addr = echan->cfg.src_addr;
1250 dst_addr = buf_addr;
1251 dev_width = echan->cfg.src_addr_width;
1252 burst = echan->cfg.src_maxburst;
1253 } else if (direction == DMA_MEM_TO_DEV) {
1254 src_addr = buf_addr;
1255 dst_addr = echan->cfg.dst_addr;
1256 dev_width = echan->cfg.dst_addr_width;
1257 burst = echan->cfg.dst_maxburst;
1258 } else {
1259 dev_err(dev, "%s: bad direction: %d\n", __func__, direction);
1260 return NULL;
1261 }
1262
1263 if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
1264 dev_err(dev, "%s: Undefined slave buswidth\n", __func__);
1265 return NULL;
1266 }
1267
1268 if (unlikely(buf_len % period_len)) {
1269 dev_err(dev, "Period should be multiple of Buffer length\n");
1270 return NULL;
1271 }
1272
1273 nslots = (buf_len / period_len) + 1;
1274
1275 /*
1276 * Cyclic DMA users such as audio cannot tolerate delays introduced
1277 * by cases where the number of periods is more than the maximum
1278 * number of SGs the EDMA driver can handle at a time. For DMA types
1279 * such as Slave SGs, such delays are tolerable and synchronized,
1280 * but the synchronization is difficult to achieve with Cyclic and
1281 * cannot be guaranteed, so we error out early.
1282 */
1283 if (nslots > MAX_NR_SG) {
1284 /*
1285 * If the burst and period sizes are the same, we can put
1286 * the full buffer into a single period and activate
1287 * intermediate interrupts. This will produce interrupts
1288 * after each burst, which is also after each desired period.
1289 */
1290 if (burst == period_len) {
1291 period_len = buf_len;
1292 nslots = 2;
1293 use_intermediate = true;
1294 } else {
1295 return NULL;
1296 }
1297 }
1298
1299 edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
1300 GFP_ATOMIC);
1301 if (!edesc) {
1302 dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__);
1303 return NULL;
1304 }
1305
1306 edesc->cyclic = 1;
1307 edesc->pset_nr = nslots;
1308 edesc->residue = edesc->residue_stat = buf_len;
1309 edesc->direction = direction;
1310 edesc->echan = echan;
1311
1312 dev_dbg(dev, "%s: channel=%d nslots=%d period_len=%zu buf_len=%zu\n",
1313 __func__, echan->ch_num, nslots, period_len, buf_len);
1314
1315 for (i = 0; i < nslots; i++) {
1316 /* Allocate a PaRAM slot, if needed */
1317 if (echan->slot[i] < 0) {
1318 echan->slot[i] =
1319 edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
1320 if (echan->slot[i] < 0) {
1321 kfree(edesc);
1322 dev_err(dev, "%s: Failed to allocate slot\n",
1323 __func__);
1324 return NULL;
1325 }
1326 }
1327
1328 if (i == nslots - 1) {
1329 memcpy(&edesc->pset[i], &edesc->pset[0],
1330 sizeof(edesc->pset[0]));
1331 break;
1332 }
1333
1334 ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
1335 dst_addr, burst, dev_width, period_len,
1336 direction);
1337 if (ret < 0) {
1338 kfree(edesc);
1339 return NULL;
1340 }
1341
1342 if (direction == DMA_DEV_TO_MEM)
1343 dst_addr += period_len;
1344 else
1345 src_addr += period_len;
1346
1347 dev_vdbg(dev, "%s: Configure period %d of buf:\n", __func__, i);
1348 dev_vdbg(dev,
1349 "\n pset[%d]:\n"
1350 " chnum\t%d\n"
1351 " slot\t%d\n"
1352 " opt\t%08x\n"
1353 " src\t%08x\n"
1354 " dst\t%08x\n"
1355 " abcnt\t%08x\n"
1356 " ccnt\t%08x\n"
1357 " bidx\t%08x\n"
1358 " cidx\t%08x\n"
1359 " lkrld\t%08x\n",
1360 i, echan->ch_num, echan->slot[i],
1361 edesc->pset[i].param.opt,
1362 edesc->pset[i].param.src,
1363 edesc->pset[i].param.dst,
1364 edesc->pset[i].param.a_b_cnt,
1365 edesc->pset[i].param.ccnt,
1366 edesc->pset[i].param.src_dst_bidx,
1367 edesc->pset[i].param.src_dst_cidx,
1368 edesc->pset[i].param.link_bcntrld);
1369
1370 edesc->absync = ret;
1371
1372 /*
1373 * Enable period interrupt only if it is requested
1374 */
1375 if (tx_flags & DMA_PREP_INTERRUPT) {
1376 edesc->pset[i].param.opt |= TCINTEN;
1377
1378 /* Also enable intermediate interrupts if necessary */
1379 if (use_intermediate)
1380 edesc->pset[i].param.opt |= ITCINTEN;
1381 }
1382 }
1383
1384 /* Place the cyclic channel to highest priority queue */
1385 if (!echan->tc)
1386 edma_assign_channel_eventq(echan, EVENTQ_0);
1387
1388 return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1389 }
1390
1391 static void edma_completion_handler(struct edma_chan *echan)
1392 {
1393 struct device *dev = echan->vchan.chan.device->dev;
1394 struct edma_desc *edesc;
1395
1396 spin_lock(&echan->vchan.lock);
1397 edesc = echan->edesc;
1398 if (edesc) {
1399 if (edesc->cyclic) {
1400 vchan_cyclic_callback(&edesc->vdesc);
1401 spin_unlock(&echan->vchan.lock);
1402 return;
1403 } else if (edesc->processed == edesc->pset_nr) {
1404 edesc->residue = 0;
1405 edma_stop(echan);
1406 vchan_cookie_complete(&edesc->vdesc);
1407 echan->edesc = NULL;
1408
1409 dev_dbg(dev, "Transfer completed on channel %d\n",
1410 echan->ch_num);
1411 } else {
1412 dev_dbg(dev, "Sub transfer completed on channel %d\n",
1413 echan->ch_num);
1414
1415 edma_pause(echan);
1416
1417 /* Update statistics for tx_status */
1418 edesc->residue -= edesc->sg_len;
1419 edesc->residue_stat = edesc->residue;
1420 edesc->processed_stat = edesc->processed;
1421 }
1422 edma_execute(echan);
1423 }
1424
1425 spin_unlock(&echan->vchan.lock);
1426 }
1427
1428 /* eDMA interrupt handler */
1429 static irqreturn_t dma_irq_handler(int irq, void *data)
1430 {
1431 struct edma_cc *ecc = data;
1432 int ctlr;
1433 u32 sh_ier;
1434 u32 sh_ipr;
1435 u32 bank;
1436
1437 ctlr = ecc->id;
1438 if (ctlr < 0)
1439 return IRQ_NONE;
1440
1441 dev_vdbg(ecc->dev, "dma_irq_handler\n");
1442
1443 sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 0);
1444 if (!sh_ipr) {
1445 sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 1);
1446 if (!sh_ipr)
1447 return IRQ_NONE;
1448 sh_ier = edma_shadow0_read_array(ecc, SH_IER, 1);
1449 bank = 1;
1450 } else {
1451 sh_ier = edma_shadow0_read_array(ecc, SH_IER, 0);
1452 bank = 0;
1453 }
1454
1455 do {
1456 u32 slot;
1457 u32 channel;
1458
1459 slot = __ffs(sh_ipr);
1460 sh_ipr &= ~(BIT(slot));
1461
1462 if (sh_ier & BIT(slot)) {
1463 channel = (bank << 5) | slot;
1464 /* Clear the corresponding IPR bits */
1465 edma_shadow0_write_array(ecc, SH_ICR, bank, BIT(slot));
1466 edma_completion_handler(&ecc->slave_chans[channel]);
1467 }
1468 } while (sh_ipr);
1469
1470 edma_shadow0_write(ecc, SH_IEVAL, 1);
1471 return IRQ_HANDLED;
1472 }
1473
1474 static void edma_error_handler(struct edma_chan *echan)
1475 {
1476 struct edma_cc *ecc = echan->ecc;
1477 struct device *dev = echan->vchan.chan.device->dev;
1478 struct edmacc_param p;
1479
1480 if (!echan->edesc)
1481 return;
1482
1483 spin_lock(&echan->vchan.lock);
1484
1485 edma_read_slot(ecc, echan->slot[0], &p);
1486 /*
1487 * Issue later based on missed flag which will be sure
1488 * to happen as:
1489 * (1) we finished transmitting an intermediate slot and
1490 * edma_execute is coming up.
1491 * (2) or we finished current transfer and issue will
1492 * call edma_execute.
1493 *
1494 * Important note: issuing can be dangerous here and
1495 * lead to some nasty recursion when we are in a NULL
1496 * slot. So we avoid doing so and set the missed flag.
1497 */
1498 if (p.a_b_cnt == 0 && p.ccnt == 0) {
1499 dev_dbg(dev, "Error on null slot, setting miss\n");
1500 echan->missed = 1;
1501 } else {
1502 /*
1503 * The slot is already programmed but the event got
1504 * missed, so its safe to issue it here.
1505 */
1506 dev_dbg(dev, "Missed event, TRIGGERING\n");
1507 edma_clean_channel(echan);
1508 edma_stop(echan);
1509 edma_start(echan);
1510 edma_trigger_channel(echan);
1511 }
1512 spin_unlock(&echan->vchan.lock);
1513 }
1514
1515 static inline bool edma_error_pending(struct edma_cc *ecc)
1516 {
1517 if (edma_read_array(ecc, EDMA_EMR, 0) ||
1518 edma_read_array(ecc, EDMA_EMR, 1) ||
1519 edma_read(ecc, EDMA_QEMR) || edma_read(ecc, EDMA_CCERR))
1520 return true;
1521
1522 return false;
1523 }
1524
1525 /* eDMA error interrupt handler */
1526 static irqreturn_t dma_ccerr_handler(int irq, void *data)
1527 {
1528 struct edma_cc *ecc = data;
1529 int i, j;
1530 int ctlr;
1531 unsigned int cnt = 0;
1532 unsigned int val;
1533
1534 ctlr = ecc->id;
1535 if (ctlr < 0)
1536 return IRQ_NONE;
1537
1538 dev_vdbg(ecc->dev, "dma_ccerr_handler\n");
1539
1540 if (!edma_error_pending(ecc))
1541 return IRQ_NONE;
1542
1543 while (1) {
1544 /* Event missed register(s) */
1545 for (j = 0; j < 2; j++) {
1546 unsigned long emr;
1547
1548 val = edma_read_array(ecc, EDMA_EMR, j);
1549 if (!val)
1550 continue;
1551
1552 dev_dbg(ecc->dev, "EMR%d 0x%08x\n", j, val);
1553 emr = val;
1554 for (i = find_next_bit(&emr, 32, 0); i < 32;
1555 i = find_next_bit(&emr, 32, i + 1)) {
1556 int k = (j << 5) + i;
1557
1558 /* Clear the corresponding EMR bits */
1559 edma_write_array(ecc, EDMA_EMCR, j, BIT(i));
1560 /* Clear any SER */
1561 edma_shadow0_write_array(ecc, SH_SECR, j,
1562 BIT(i));
1563 edma_error_handler(&ecc->slave_chans[k]);
1564 }
1565 }
1566
1567 val = edma_read(ecc, EDMA_QEMR);
1568 if (val) {
1569 dev_dbg(ecc->dev, "QEMR 0x%02x\n", val);
1570 /* Not reported, just clear the interrupt reason. */
1571 edma_write(ecc, EDMA_QEMCR, val);
1572 edma_shadow0_write(ecc, SH_QSECR, val);
1573 }
1574
1575 val = edma_read(ecc, EDMA_CCERR);
1576 if (val) {
1577 dev_warn(ecc->dev, "CCERR 0x%08x\n", val);
1578 /* Not reported, just clear the interrupt reason. */
1579 edma_write(ecc, EDMA_CCERRCLR, val);
1580 }
1581
1582 if (!edma_error_pending(ecc))
1583 break;
1584 cnt++;
1585 if (cnt > 10)
1586 break;
1587 }
1588 edma_write(ecc, EDMA_EEVAL, 1);
1589 return IRQ_HANDLED;
1590 }
1591
1592 /* Alloc channel resources */
1593 static int edma_alloc_chan_resources(struct dma_chan *chan)
1594 {
1595 struct edma_chan *echan = to_edma_chan(chan);
1596 struct edma_cc *ecc = echan->ecc;
1597 struct device *dev = ecc->dev;
1598 enum dma_event_q eventq_no = EVENTQ_DEFAULT;
1599 int ret;
1600
1601 if (echan->tc) {
1602 eventq_no = echan->tc->id;
1603 } else if (ecc->tc_list) {
1604 /* memcpy channel */
1605 echan->tc = &ecc->tc_list[ecc->info->default_queue];
1606 eventq_no = echan->tc->id;
1607 }
1608
1609 ret = edma_alloc_channel(echan, eventq_no);
1610 if (ret)
1611 return ret;
1612
1613 echan->slot[0] = edma_alloc_slot(ecc, echan->ch_num);
1614 if (echan->slot[0] < 0) {
1615 dev_err(dev, "Entry slot allocation failed for channel %u\n",
1616 EDMA_CHAN_SLOT(echan->ch_num));
1617 goto err_slot;
1618 }
1619
1620 /* Set up channel -> slot mapping for the entry slot */
1621 edma_set_chmap(echan, echan->slot[0]);
1622 echan->alloced = true;
1623
1624 dev_dbg(dev, "Got eDMA channel %d for virt channel %d (%s trigger)\n",
1625 EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id,
1626 echan->hw_triggered ? "HW" : "SW");
1627
1628 return 0;
1629
1630 err_slot:
1631 edma_free_channel(echan);
1632 return ret;
1633 }
1634
1635 /* Free channel resources */
1636 static void edma_free_chan_resources(struct dma_chan *chan)
1637 {
1638 struct edma_chan *echan = to_edma_chan(chan);
1639 struct device *dev = echan->ecc->dev;
1640 int i;
1641
1642 /* Terminate transfers */
1643 edma_stop(echan);
1644
1645 vchan_free_chan_resources(&echan->vchan);
1646
1647 /* Free EDMA PaRAM slots */
1648 for (i = 0; i < EDMA_MAX_SLOTS; i++) {
1649 if (echan->slot[i] >= 0) {
1650 edma_free_slot(echan->ecc, echan->slot[i]);
1651 echan->slot[i] = -1;
1652 }
1653 }
1654
1655 /* Set entry slot to the dummy slot */
1656 edma_set_chmap(echan, echan->ecc->dummy_slot);
1657
1658 /* Free EDMA channel */
1659 if (echan->alloced) {
1660 edma_free_channel(echan);
1661 echan->alloced = false;
1662 }
1663
1664 echan->tc = NULL;
1665 echan->hw_triggered = false;
1666
1667 dev_dbg(dev, "Free eDMA channel %d for virt channel %d\n",
1668 EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id);
1669 }
1670
1671 /* Send pending descriptor to hardware */
1672 static void edma_issue_pending(struct dma_chan *chan)
1673 {
1674 struct edma_chan *echan = to_edma_chan(chan);
1675 unsigned long flags;
1676
1677 spin_lock_irqsave(&echan->vchan.lock, flags);
1678 if (vchan_issue_pending(&echan->vchan) && !echan->edesc)
1679 edma_execute(echan);
1680 spin_unlock_irqrestore(&echan->vchan.lock, flags);
1681 }
1682
1683 /*
1684 * This limit exists to avoid a possible infinite loop when waiting for proof
1685 * that a particular transfer is completed. This limit can be hit if there
1686 * are large bursts to/from slow devices or the CPU is never able to catch
1687 * the DMA hardware idle. On an AM335x transfering 48 bytes from the UART
1688 * RX-FIFO, as many as 55 loops have been seen.
1689 */
1690 #define EDMA_MAX_TR_WAIT_LOOPS 1000
1691
1692 static u32 edma_residue(struct edma_desc *edesc)
1693 {
1694 bool dst = edesc->direction == DMA_DEV_TO_MEM;
1695 int loop_count = EDMA_MAX_TR_WAIT_LOOPS;
1696 struct edma_chan *echan = edesc->echan;
1697 struct edma_pset *pset = edesc->pset;
1698 dma_addr_t done, pos;
1699 int i;
1700
1701 /*
1702 * We always read the dst/src position from the first RamPar
1703 * pset. That's the one which is active now.
1704 */
1705 pos = edma_get_position(echan->ecc, echan->slot[0], dst);
1706
1707 /*
1708 * "pos" may represent a transfer request that is still being
1709 * processed by the EDMACC or EDMATC. We will busy wait until
1710 * any one of the situations occurs:
1711 * 1. the DMA hardware is idle
1712 * 2. a new transfer request is setup
1713 * 3. we hit the loop limit
1714 */
1715 while (edma_read(echan->ecc, EDMA_CCSTAT) & EDMA_CCSTAT_ACTV) {
1716 /* check if a new transfer request is setup */
1717 if (edma_get_position(echan->ecc,
1718 echan->slot[0], dst) != pos) {
1719 break;
1720 }
1721
1722 if (!--loop_count) {
1723 dev_dbg_ratelimited(echan->vchan.chan.device->dev,
1724 "%s: timeout waiting for PaRAM update\n",
1725 __func__);
1726 break;
1727 }
1728
1729 cpu_relax();
1730 }
1731
1732 /*
1733 * Cyclic is simple. Just subtract pset[0].addr from pos.
1734 *
1735 * We never update edesc->residue in the cyclic case, so we
1736 * can tell the remaining room to the end of the circular
1737 * buffer.
1738 */
1739 if (edesc->cyclic) {
1740 done = pos - pset->addr;
1741 edesc->residue_stat = edesc->residue - done;
1742 return edesc->residue_stat;
1743 }
1744
1745 /*
1746 * For SG operation we catch up with the last processed
1747 * status.
1748 */
1749 pset += edesc->processed_stat;
1750
1751 for (i = edesc->processed_stat; i < edesc->processed; i++, pset++) {
1752 /*
1753 * If we are inside this pset address range, we know
1754 * this is the active one. Get the current delta and
1755 * stop walking the psets.
1756 */
1757 if (pos >= pset->addr && pos < pset->addr + pset->len)
1758 return edesc->residue_stat - (pos - pset->addr);
1759
1760 /* Otherwise mark it done and update residue_stat. */
1761 edesc->processed_stat++;
1762 edesc->residue_stat -= pset->len;
1763 }
1764 return edesc->residue_stat;
1765 }
1766
1767 /* Check request completion status */
1768 static enum dma_status edma_tx_status(struct dma_chan *chan,
1769 dma_cookie_t cookie,
1770 struct dma_tx_state *txstate)
1771 {
1772 struct edma_chan *echan = to_edma_chan(chan);
1773 struct virt_dma_desc *vdesc;
1774 enum dma_status ret;
1775 unsigned long flags;
1776
1777 ret = dma_cookie_status(chan, cookie, txstate);
1778 if (ret == DMA_COMPLETE || !txstate)
1779 return ret;
1780
1781 spin_lock_irqsave(&echan->vchan.lock, flags);
1782 if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie)
1783 txstate->residue = edma_residue(echan->edesc);
1784 else if ((vdesc = vchan_find_desc(&echan->vchan, cookie)))
1785 txstate->residue = to_edma_desc(&vdesc->tx)->residue;
1786 spin_unlock_irqrestore(&echan->vchan.lock, flags);
1787
1788 return ret;
1789 }
1790
1791 static bool edma_is_memcpy_channel(int ch_num, s32 *memcpy_channels)
1792 {
1793 if (!memcpy_channels)
1794 return false;
1795 while (*memcpy_channels != -1) {
1796 if (*memcpy_channels == ch_num)
1797 return true;
1798 memcpy_channels++;
1799 }
1800 return false;
1801 }
1802
1803 #define EDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
1804 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
1805 BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
1806 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
1807
1808 static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode)
1809 {
1810 struct dma_device *s_ddev = &ecc->dma_slave;
1811 struct dma_device *m_ddev = NULL;
1812 s32 *memcpy_channels = ecc->info->memcpy_channels;
1813 int i, j;
1814
1815 dma_cap_zero(s_ddev->cap_mask);
1816 dma_cap_set(DMA_SLAVE, s_ddev->cap_mask);
1817 dma_cap_set(DMA_CYCLIC, s_ddev->cap_mask);
1818 if (ecc->legacy_mode && !memcpy_channels) {
1819 dev_warn(ecc->dev,
1820 "Legacy memcpy is enabled, things might not work\n");
1821
1822 dma_cap_set(DMA_MEMCPY, s_ddev->cap_mask);
1823 s_ddev->device_prep_dma_memcpy = edma_prep_dma_memcpy;
1824 s_ddev->directions = BIT(DMA_MEM_TO_MEM);
1825 }
1826
1827 s_ddev->device_prep_slave_sg = edma_prep_slave_sg;
1828 s_ddev->device_prep_dma_cyclic = edma_prep_dma_cyclic;
1829 s_ddev->device_alloc_chan_resources = edma_alloc_chan_resources;
1830 s_ddev->device_free_chan_resources = edma_free_chan_resources;
1831 s_ddev->device_issue_pending = edma_issue_pending;
1832 s_ddev->device_tx_status = edma_tx_status;
1833 s_ddev->device_config = edma_slave_config;
1834 s_ddev->device_pause = edma_dma_pause;
1835 s_ddev->device_resume = edma_dma_resume;
1836 s_ddev->device_terminate_all = edma_terminate_all;
1837 s_ddev->device_synchronize = edma_synchronize;
1838
1839 s_ddev->src_addr_widths = EDMA_DMA_BUSWIDTHS;
1840 s_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
1841 s_ddev->directions |= (BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV));
1842 s_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1843
1844 s_ddev->dev = ecc->dev;
1845 INIT_LIST_HEAD(&s_ddev->channels);
1846
1847 if (memcpy_channels) {
1848 m_ddev = devm_kzalloc(ecc->dev, sizeof(*m_ddev), GFP_KERNEL);
1849 ecc->dma_memcpy = m_ddev;
1850
1851 dma_cap_zero(m_ddev->cap_mask);
1852 dma_cap_set(DMA_MEMCPY, m_ddev->cap_mask);
1853
1854 m_ddev->device_prep_dma_memcpy = edma_prep_dma_memcpy;
1855 m_ddev->device_alloc_chan_resources = edma_alloc_chan_resources;
1856 m_ddev->device_free_chan_resources = edma_free_chan_resources;
1857 m_ddev->device_issue_pending = edma_issue_pending;
1858 m_ddev->device_tx_status = edma_tx_status;
1859 m_ddev->device_config = edma_slave_config;
1860 m_ddev->device_pause = edma_dma_pause;
1861 m_ddev->device_resume = edma_dma_resume;
1862 m_ddev->device_terminate_all = edma_terminate_all;
1863 m_ddev->device_synchronize = edma_synchronize;
1864
1865 m_ddev->src_addr_widths = EDMA_DMA_BUSWIDTHS;
1866 m_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
1867 m_ddev->directions = BIT(DMA_MEM_TO_MEM);
1868 m_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1869
1870 m_ddev->dev = ecc->dev;
1871 INIT_LIST_HEAD(&m_ddev->channels);
1872 } else if (!ecc->legacy_mode) {
1873 dev_info(ecc->dev, "memcpy is disabled\n");
1874 }
1875
1876 for (i = 0; i < ecc->num_channels; i++) {
1877 struct edma_chan *echan = &ecc->slave_chans[i];
1878 echan->ch_num = EDMA_CTLR_CHAN(ecc->id, i);
1879 echan->ecc = ecc;
1880 echan->vchan.desc_free = edma_desc_free;
1881
1882 if (m_ddev && edma_is_memcpy_channel(i, memcpy_channels))
1883 vchan_init(&echan->vchan, m_ddev);
1884 else
1885 vchan_init(&echan->vchan, s_ddev);
1886
1887 INIT_LIST_HEAD(&echan->node);
1888 for (j = 0; j < EDMA_MAX_SLOTS; j++)
1889 echan->slot[j] = -1;
1890 }
1891 }
1892
1893 static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
1894 struct edma_cc *ecc)
1895 {
1896 int i;
1897 u32 value, cccfg;
1898 s8 (*queue_priority_map)[2];
1899
1900 /* Decode the eDMA3 configuration from CCCFG register */
1901 cccfg = edma_read(ecc, EDMA_CCCFG);
1902
1903 value = GET_NUM_REGN(cccfg);
1904 ecc->num_region = BIT(value);
1905
1906 value = GET_NUM_DMACH(cccfg);
1907 ecc->num_channels = BIT(value + 1);
1908
1909 value = GET_NUM_QDMACH(cccfg);
1910 ecc->num_qchannels = value * 2;
1911
1912 value = GET_NUM_PAENTRY(cccfg);
1913 ecc->num_slots = BIT(value + 4);
1914
1915 value = GET_NUM_EVQUE(cccfg);
1916 ecc->num_tc = value + 1;
1917
1918 ecc->chmap_exist = (cccfg & CHMAP_EXIST) ? true : false;
1919
1920 dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg);
1921 dev_dbg(dev, "num_region: %u\n", ecc->num_region);
1922 dev_dbg(dev, "num_channels: %u\n", ecc->num_channels);
1923 dev_dbg(dev, "num_qchannels: %u\n", ecc->num_qchannels);
1924 dev_dbg(dev, "num_slots: %u\n", ecc->num_slots);
1925 dev_dbg(dev, "num_tc: %u\n", ecc->num_tc);
1926 dev_dbg(dev, "chmap_exist: %s\n", ecc->chmap_exist ? "yes" : "no");
1927
1928 /* Nothing need to be done if queue priority is provided */
1929 if (pdata->queue_priority_mapping)
1930 return 0;
1931
1932 /*
1933 * Configure TC/queue priority as follows:
1934 * Q0 - priority 0
1935 * Q1 - priority 1
1936 * Q2 - priority 2
1937 * ...
1938 * The meaning of priority numbers: 0 highest priority, 7 lowest
1939 * priority. So Q0 is the highest priority queue and the last queue has
1940 * the lowest priority.
1941 */
1942 queue_priority_map = devm_kcalloc(dev, ecc->num_tc + 1, sizeof(s8),
1943 GFP_KERNEL);
1944 if (!queue_priority_map)
1945 return -ENOMEM;
1946
1947 for (i = 0; i < ecc->num_tc; i++) {
1948 queue_priority_map[i][0] = i;
1949 queue_priority_map[i][1] = i;
1950 }
1951 queue_priority_map[i][0] = -1;
1952 queue_priority_map[i][1] = -1;
1953
1954 pdata->queue_priority_mapping = queue_priority_map;
1955 /* Default queue has the lowest priority */
1956 pdata->default_queue = i - 1;
1957
1958 return 0;
1959 }
1960
1961 #if IS_ENABLED(CONFIG_OF)
1962 static int edma_xbar_event_map(struct device *dev, struct edma_soc_info *pdata,
1963 size_t sz)
1964 {
1965 const char pname[] = "ti,edma-xbar-event-map";
1966 struct resource res;
1967 void __iomem *xbar;
1968 s16 (*xbar_chans)[2];
1969 size_t nelm = sz / sizeof(s16);
1970 u32 shift, offset, mux;
1971 int ret, i;
1972
1973 xbar_chans = devm_kcalloc(dev, nelm + 2, sizeof(s16), GFP_KERNEL);
1974 if (!xbar_chans)
1975 return -ENOMEM;
1976
1977 ret = of_address_to_resource(dev->of_node, 1, &res);
1978 if (ret)
1979 return -ENOMEM;
1980
1981 xbar = devm_ioremap(dev, res.start, resource_size(&res));
1982 if (!xbar)
1983 return -ENOMEM;
1984
1985 ret = of_property_read_u16_array(dev->of_node, pname, (u16 *)xbar_chans,
1986 nelm);
1987 if (ret)
1988 return -EIO;
1989
1990 /* Invalidate last entry for the other user of this mess */
1991 nelm >>= 1;
1992 xbar_chans[nelm][0] = -1;
1993 xbar_chans[nelm][1] = -1;
1994
1995 for (i = 0; i < nelm; i++) {
1996 shift = (xbar_chans[i][1] & 0x03) << 3;
1997 offset = xbar_chans[i][1] & 0xfffffffc;
1998 mux = readl(xbar + offset);
1999 mux &= ~(0xff << shift);
2000 mux |= xbar_chans[i][0] << shift;
2001 writel(mux, (xbar + offset));
2002 }
2003
2004 pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
2005 return 0;
2006 }
2007
2008 static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
2009 bool legacy_mode)
2010 {
2011 struct edma_soc_info *info;
2012 struct property *prop;
2013 size_t sz;
2014 int ret;
2015
2016 info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
2017 if (!info)
2018 return ERR_PTR(-ENOMEM);
2019
2020 if (legacy_mode) {
2021 prop = of_find_property(dev->of_node, "ti,edma-xbar-event-map",
2022 &sz);
2023 if (prop) {
2024 ret = edma_xbar_event_map(dev, info, sz);
2025 if (ret)
2026 return ERR_PTR(ret);
2027 }
2028 return info;
2029 }
2030
2031 /* Get the list of channels allocated to be used for memcpy */
2032 prop = of_find_property(dev->of_node, "ti,edma-memcpy-channels", &sz);
2033 if (prop) {
2034 const char pname[] = "ti,edma-memcpy-channels";
2035 size_t nelm = sz / sizeof(s32);
2036 s32 *memcpy_ch;
2037
2038 memcpy_ch = devm_kcalloc(dev, nelm + 1, sizeof(s32),
2039 GFP_KERNEL);
2040 if (!memcpy_ch)
2041 return ERR_PTR(-ENOMEM);
2042
2043 ret = of_property_read_u32_array(dev->of_node, pname,
2044 (u32 *)memcpy_ch, nelm);
2045 if (ret)
2046 return ERR_PTR(ret);
2047
2048 memcpy_ch[nelm] = -1;
2049 info->memcpy_channels = memcpy_ch;
2050 }
2051
2052 prop = of_find_property(dev->of_node, "ti,edma-reserved-slot-ranges",
2053 &sz);
2054 if (prop) {
2055 const char pname[] = "ti,edma-reserved-slot-ranges";
2056 u32 (*tmp)[2];
2057 s16 (*rsv_slots)[2];
2058 size_t nelm = sz / sizeof(*tmp);
2059 struct edma_rsv_info *rsv_info;
2060 int i;
2061
2062 if (!nelm)
2063 return info;
2064
2065 tmp = kcalloc(nelm, sizeof(*tmp), GFP_KERNEL);
2066 if (!tmp)
2067 return ERR_PTR(-ENOMEM);
2068
2069 rsv_info = devm_kzalloc(dev, sizeof(*rsv_info), GFP_KERNEL);
2070 if (!rsv_info) {
2071 kfree(tmp);
2072 return ERR_PTR(-ENOMEM);
2073 }
2074
2075 rsv_slots = devm_kcalloc(dev, nelm + 1, sizeof(*rsv_slots),
2076 GFP_KERNEL);
2077 if (!rsv_slots) {
2078 kfree(tmp);
2079 return ERR_PTR(-ENOMEM);
2080 }
2081
2082 ret = of_property_read_u32_array(dev->of_node, pname,
2083 (u32 *)tmp, nelm * 2);
2084 if (ret) {
2085 kfree(tmp);
2086 return ERR_PTR(ret);
2087 }
2088
2089 for (i = 0; i < nelm; i++) {
2090 rsv_slots[i][0] = tmp[i][0];
2091 rsv_slots[i][1] = tmp[i][1];
2092 }
2093 rsv_slots[nelm][0] = -1;
2094 rsv_slots[nelm][1] = -1;
2095
2096 info->rsv = rsv_info;
2097 info->rsv->rsv_slots = (const s16 (*)[2])rsv_slots;
2098
2099 kfree(tmp);
2100 }
2101
2102 return info;
2103 }
2104
2105 static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
2106 struct of_dma *ofdma)
2107 {
2108 struct edma_cc *ecc = ofdma->of_dma_data;
2109 struct dma_chan *chan = NULL;
2110 struct edma_chan *echan;
2111 int i;
2112
2113 if (!ecc || dma_spec->args_count < 1)
2114 return NULL;
2115
2116 for (i = 0; i < ecc->num_channels; i++) {
2117 echan = &ecc->slave_chans[i];
2118 if (echan->ch_num == dma_spec->args[0]) {
2119 chan = &echan->vchan.chan;
2120 break;
2121 }
2122 }
2123
2124 if (!chan)
2125 return NULL;
2126
2127 if (echan->ecc->legacy_mode && dma_spec->args_count == 1)
2128 goto out;
2129
2130 if (!echan->ecc->legacy_mode && dma_spec->args_count == 2 &&
2131 dma_spec->args[1] < echan->ecc->num_tc) {
2132 echan->tc = &echan->ecc->tc_list[dma_spec->args[1]];
2133 goto out;
2134 }
2135
2136 return NULL;
2137 out:
2138 /* The channel is going to be used as HW synchronized */
2139 echan->hw_triggered = true;
2140 return dma_get_slave_channel(chan);
2141 }
2142 #else
2143 static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
2144 bool legacy_mode)
2145 {
2146 return ERR_PTR(-EINVAL);
2147 }
2148
2149 static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
2150 struct of_dma *ofdma)
2151 {
2152 return NULL;
2153 }
2154 #endif
2155
2156 static int edma_probe(struct platform_device *pdev)
2157 {
2158 struct edma_soc_info *info = pdev->dev.platform_data;
2159 s8 (*queue_priority_mapping)[2];
2160 int i, off, ln;
2161 const s16 (*rsv_slots)[2];
2162 const s16 (*xbar_chans)[2];
2163 int irq;
2164 char *irq_name;
2165 struct resource *mem;
2166 struct device_node *node = pdev->dev.of_node;
2167 struct device *dev = &pdev->dev;
2168 struct edma_cc *ecc;
2169 bool legacy_mode = true;
2170 int ret;
2171
2172 if (node) {
2173 const struct of_device_id *match;
2174
2175 match = of_match_node(edma_of_ids, node);
2176 if (match && (u32)match->data == EDMA_BINDING_TPCC)
2177 legacy_mode = false;
2178
2179 info = edma_setup_info_from_dt(dev, legacy_mode);
2180 if (IS_ERR(info)) {
2181 dev_err(dev, "failed to get DT data\n");
2182 return PTR_ERR(info);
2183 }
2184 }
2185
2186 if (!info)
2187 return -ENODEV;
2188
2189 pm_runtime_enable(dev);
2190 ret = pm_runtime_get_sync(dev);
2191 if (ret < 0) {
2192 dev_err(dev, "pm_runtime_get_sync() failed\n");
2193 return ret;
2194 }
2195
2196 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
2197 if (ret)
2198 return ret;
2199
2200 ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);
2201 if (!ecc) {
2202 dev_err(dev, "Can't allocate controller\n");
2203 return -ENOMEM;
2204 }
2205
2206 ecc->dev = dev;
2207 ecc->id = pdev->id;
2208 ecc->legacy_mode = legacy_mode;
2209 /* When booting with DT the pdev->id is -1 */
2210 if (ecc->id < 0)
2211 ecc->id = 0;
2212
2213 mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "edma3_cc");
2214 if (!mem) {
2215 dev_dbg(dev, "mem resource not found, using index 0\n");
2216 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2217 if (!mem) {
2218 dev_err(dev, "no mem resource?\n");
2219 return -ENODEV;
2220 }
2221 }
2222 ecc->base = devm_ioremap_resource(dev, mem);
2223 if (IS_ERR(ecc->base))
2224 return PTR_ERR(ecc->base);
2225
2226 platform_set_drvdata(pdev, ecc);
2227
2228 /* Get eDMA3 configuration from IP */
2229 ret = edma_setup_from_hw(dev, info, ecc);
2230 if (ret)
2231 return ret;
2232
2233 /* Allocate memory based on the information we got from the IP */
2234 ecc->slave_chans = devm_kcalloc(dev, ecc->num_channels,
2235 sizeof(*ecc->slave_chans), GFP_KERNEL);
2236 if (!ecc->slave_chans)
2237 return -ENOMEM;
2238
2239 ecc->slot_inuse = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_slots),
2240 sizeof(unsigned long), GFP_KERNEL);
2241 if (!ecc->slot_inuse)
2242 return -ENOMEM;
2243
2244 ecc->default_queue = info->default_queue;
2245
2246 for (i = 0; i < ecc->num_slots; i++)
2247 edma_write_slot(ecc, i, &dummy_paramset);
2248
2249 if (info->rsv) {
2250 /* Set the reserved slots in inuse list */
2251 rsv_slots = info->rsv->rsv_slots;
2252 if (rsv_slots) {
2253 for (i = 0; rsv_slots[i][0] != -1; i++) {
2254 off = rsv_slots[i][0];
2255 ln = rsv_slots[i][1];
2256 set_bits(off, ln, ecc->slot_inuse);
2257 }
2258 }
2259 }
2260
2261 /* Clear the xbar mapped channels in unused list */
2262 xbar_chans = info->xbar_chans;
2263 if (xbar_chans) {
2264 for (i = 0; xbar_chans[i][1] != -1; i++) {
2265 off = xbar_chans[i][1];
2266 }
2267 }
2268
2269 irq = platform_get_irq_byname(pdev, "edma3_ccint");
2270 if (irq < 0 && node)
2271 irq = irq_of_parse_and_map(node, 0);
2272
2273 if (irq >= 0) {
2274 irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccint",
2275 dev_name(dev));
2276 ret = devm_request_irq(dev, irq, dma_irq_handler, 0, irq_name,
2277 ecc);
2278 if (ret) {
2279 dev_err(dev, "CCINT (%d) failed --> %d\n", irq, ret);
2280 return ret;
2281 }
2282 }
2283
2284 irq = platform_get_irq_byname(pdev, "edma3_ccerrint");
2285 if (irq < 0 && node)
2286 irq = irq_of_parse_and_map(node, 2);
2287
2288 if (irq >= 0) {
2289 irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccerrint",
2290 dev_name(dev));
2291 ret = devm_request_irq(dev, irq, dma_ccerr_handler, 0, irq_name,
2292 ecc);
2293 if (ret) {
2294 dev_err(dev, "CCERRINT (%d) failed --> %d\n", irq, ret);
2295 return ret;
2296 }
2297 }
2298
2299 ecc->dummy_slot = edma_alloc_slot(ecc, EDMA_SLOT_ANY);
2300 if (ecc->dummy_slot < 0) {
2301 dev_err(dev, "Can't allocate PaRAM dummy slot\n");
2302 return ecc->dummy_slot;
2303 }
2304
2305 queue_priority_mapping = info->queue_priority_mapping;
2306
2307 if (!ecc->legacy_mode) {
2308 int lowest_priority = 0;
2309 struct of_phandle_args tc_args;
2310
2311 ecc->tc_list = devm_kcalloc(dev, ecc->num_tc,
2312 sizeof(*ecc->tc_list), GFP_KERNEL);
2313 if (!ecc->tc_list)
2314 return -ENOMEM;
2315
2316 for (i = 0;; i++) {
2317 ret = of_parse_phandle_with_fixed_args(node, "ti,tptcs",
2318 1, i, &tc_args);
2319 if (ret || i == ecc->num_tc)
2320 break;
2321
2322 ecc->tc_list[i].node = tc_args.np;
2323 ecc->tc_list[i].id = i;
2324 queue_priority_mapping[i][1] = tc_args.args[0];
2325 if (queue_priority_mapping[i][1] > lowest_priority) {
2326 lowest_priority = queue_priority_mapping[i][1];
2327 info->default_queue = i;
2328 }
2329 }
2330 }
2331
2332 /* Event queue priority mapping */
2333 for (i = 0; queue_priority_mapping[i][0] != -1; i++)
2334 edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
2335 queue_priority_mapping[i][1]);
2336
2337 for (i = 0; i < ecc->num_region; i++) {
2338 edma_write_array2(ecc, EDMA_DRAE, i, 0, 0x0);
2339 edma_write_array2(ecc, EDMA_DRAE, i, 1, 0x0);
2340 edma_write_array(ecc, EDMA_QRAE, i, 0x0);
2341 }
2342 ecc->info = info;
2343
2344 /* Init the dma device and channels */
2345 edma_dma_init(ecc, legacy_mode);
2346
2347 for (i = 0; i < ecc->num_channels; i++) {
2348 /* Assign all channels to the default queue */
2349 edma_assign_channel_eventq(&ecc->slave_chans[i],
2350 info->default_queue);
2351 /* Set entry slot to the dummy slot */
2352 edma_set_chmap(&ecc->slave_chans[i], ecc->dummy_slot);
2353 }
2354
2355 ecc->dma_slave.filter.map = info->slave_map;
2356 ecc->dma_slave.filter.mapcnt = info->slavecnt;
2357 ecc->dma_slave.filter.fn = edma_filter_fn;
2358
2359 ret = dma_async_device_register(&ecc->dma_slave);
2360 if (ret) {
2361 dev_err(dev, "slave ddev registration failed (%d)\n", ret);
2362 goto err_reg1;
2363 }
2364
2365 if (ecc->dma_memcpy) {
2366 ret = dma_async_device_register(ecc->dma_memcpy);
2367 if (ret) {
2368 dev_err(dev, "memcpy ddev registration failed (%d)\n",
2369 ret);
2370 dma_async_device_unregister(&ecc->dma_slave);
2371 goto err_reg1;
2372 }
2373 }
2374
2375 if (node)
2376 of_dma_controller_register(node, of_edma_xlate, ecc);
2377
2378 dev_info(dev, "TI EDMA DMA engine driver\n");
2379
2380 return 0;
2381
2382 err_reg1:
2383 edma_free_slot(ecc, ecc->dummy_slot);
2384 return ret;
2385 }
2386
2387 static int edma_remove(struct platform_device *pdev)
2388 {
2389 struct device *dev = &pdev->dev;
2390 struct edma_cc *ecc = dev_get_drvdata(dev);
2391
2392 if (dev->of_node)
2393 of_dma_controller_free(dev->of_node);
2394 dma_async_device_unregister(&ecc->dma_slave);
2395 if (ecc->dma_memcpy)
2396 dma_async_device_unregister(ecc->dma_memcpy);
2397 edma_free_slot(ecc, ecc->dummy_slot);
2398
2399 return 0;
2400 }
2401
2402 #ifdef CONFIG_PM_SLEEP
2403 static int edma_pm_suspend(struct device *dev)
2404 {
2405 struct edma_cc *ecc = dev_get_drvdata(dev);
2406 struct edma_chan *echan = ecc->slave_chans;
2407 int i;
2408
2409 for (i = 0; i < ecc->num_channels; i++) {
2410 if (echan[i].alloced)
2411 edma_setup_interrupt(&echan[i], false);
2412 }
2413
2414 return 0;
2415 }
2416
2417 static int edma_pm_resume(struct device *dev)
2418 {
2419 struct edma_cc *ecc = dev_get_drvdata(dev);
2420 struct edma_chan *echan = ecc->slave_chans;
2421 int i;
2422 s8 (*queue_priority_mapping)[2];
2423
2424 queue_priority_mapping = ecc->info->queue_priority_mapping;
2425
2426 /* Event queue priority mapping */
2427 for (i = 0; queue_priority_mapping[i][0] != -1; i++)
2428 edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
2429 queue_priority_mapping[i][1]);
2430
2431 for (i = 0; i < ecc->num_channels; i++) {
2432 if (echan[i].alloced) {
2433 /* ensure access through shadow region 0 */
2434 edma_or_array2(ecc, EDMA_DRAE, 0, i >> 5,
2435 BIT(i & 0x1f));
2436
2437 edma_setup_interrupt(&echan[i], true);
2438
2439 /* Set up channel -> slot mapping for the entry slot */
2440 edma_set_chmap(&echan[i], echan[i].slot[0]);
2441 }
2442 }
2443
2444 return 0;
2445 }
2446 #endif
2447
2448 static const struct dev_pm_ops edma_pm_ops = {
2449 SET_LATE_SYSTEM_SLEEP_PM_OPS(edma_pm_suspend, edma_pm_resume)
2450 };
2451
2452 static struct platform_driver edma_driver = {
2453 .probe = edma_probe,
2454 .remove = edma_remove,
2455 .driver = {
2456 .name = "edma",
2457 .pm = &edma_pm_ops,
2458 .of_match_table = edma_of_ids,
2459 },
2460 };
2461
2462 static int edma_tptc_probe(struct platform_device *pdev)
2463 {
2464 pm_runtime_enable(&pdev->dev);
2465 return pm_runtime_get_sync(&pdev->dev);
2466 }
2467
2468 static struct platform_driver edma_tptc_driver = {
2469 .probe = edma_tptc_probe,
2470 .driver = {
2471 .name = "edma3-tptc",
2472 .of_match_table = edma_tptc_of_ids,
2473 },
2474 };
2475
2476 bool edma_filter_fn(struct dma_chan *chan, void *param)
2477 {
2478 bool match = false;
2479
2480 if (chan->device->dev->driver == &edma_driver.driver) {
2481 struct edma_chan *echan = to_edma_chan(chan);
2482 unsigned ch_req = *(unsigned *)param;
2483 if (ch_req == echan->ch_num) {
2484 /* The channel is going to be used as HW synchronized */
2485 echan->hw_triggered = true;
2486 match = true;
2487 }
2488 }
2489 return match;
2490 }
2491 EXPORT_SYMBOL(edma_filter_fn);
2492
2493 static int edma_init(void)
2494 {
2495 int ret;
2496
2497 ret = platform_driver_register(&edma_tptc_driver);
2498 if (ret)
2499 return ret;
2500
2501 return platform_driver_register(&edma_driver);
2502 }
2503 subsys_initcall(edma_init);
2504
2505 static void __exit edma_exit(void)
2506 {
2507 platform_driver_unregister(&edma_driver);
2508 platform_driver_unregister(&edma_tptc_driver);
2509 }
2510 module_exit(edma_exit);
2511
2512 MODULE_AUTHOR("Matt Porter <matt.porter@linaro.org>");
2513 MODULE_DESCRIPTION("TI EDMA DMA engine driver");
2514 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support