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Linux 4.1.18
[linux/fpc-iii.git] / arch / arm / common / edma.c
blob30613204da154ad5ce617a1057f6c758ea62da38
1 /*
2 * EDMA3 support for DaVinci
3 *
4 * Copyright (C) 2006-2009 Texas Instruments.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20 #include <linux/err.h>
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
26 #include <linux/io.h>
27 #include <linux/slab.h>
28 #include <linux/edma.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/of_address.h>
31 #include <linux/of_device.h>
32 #include <linux/of_dma.h>
33 #include <linux/of_irq.h>
34 #include <linux/pm_runtime.h>
35
36 #include <linux/platform_data/edma.h>
37
38 /* Offsets matching "struct edmacc_param" */
39 #define PARM_OPT 0x00
40 #define PARM_SRC 0x04
41 #define PARM_A_B_CNT 0x08
42 #define PARM_DST 0x0c
43 #define PARM_SRC_DST_BIDX 0x10
44 #define PARM_LINK_BCNTRLD 0x14
45 #define PARM_SRC_DST_CIDX 0x18
46 #define PARM_CCNT 0x1c
47
48 #define PARM_SIZE 0x20
49
50 /* Offsets for EDMA CC global channel registers and their shadows */
51 #define SH_ER 0x00 /* 64 bits */
52 #define SH_ECR 0x08 /* 64 bits */
53 #define SH_ESR 0x10 /* 64 bits */
54 #define SH_CER 0x18 /* 64 bits */
55 #define SH_EER 0x20 /* 64 bits */
56 #define SH_EECR 0x28 /* 64 bits */
57 #define SH_EESR 0x30 /* 64 bits */
58 #define SH_SER 0x38 /* 64 bits */
59 #define SH_SECR 0x40 /* 64 bits */
60 #define SH_IER 0x50 /* 64 bits */
61 #define SH_IECR 0x58 /* 64 bits */
62 #define SH_IESR 0x60 /* 64 bits */
63 #define SH_IPR 0x68 /* 64 bits */
64 #define SH_ICR 0x70 /* 64 bits */
65 #define SH_IEVAL 0x78
66 #define SH_QER 0x80
67 #define SH_QEER 0x84
68 #define SH_QEECR 0x88
69 #define SH_QEESR 0x8c
70 #define SH_QSER 0x90
71 #define SH_QSECR 0x94
72 #define SH_SIZE 0x200
73
74 /* Offsets for EDMA CC global registers */
75 #define EDMA_REV 0x0000
76 #define EDMA_CCCFG 0x0004
77 #define EDMA_QCHMAP 0x0200 /* 8 registers */
78 #define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
79 #define EDMA_QDMAQNUM 0x0260
80 #define EDMA_QUETCMAP 0x0280
81 #define EDMA_QUEPRI 0x0284
82 #define EDMA_EMR 0x0300 /* 64 bits */
83 #define EDMA_EMCR 0x0308 /* 64 bits */
84 #define EDMA_QEMR 0x0310
85 #define EDMA_QEMCR 0x0314
86 #define EDMA_CCERR 0x0318
87 #define EDMA_CCERRCLR 0x031c
88 #define EDMA_EEVAL 0x0320
89 #define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
90 #define EDMA_QRAE 0x0380 /* 4 registers */
91 #define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
92 #define EDMA_QSTAT 0x0600 /* 2 registers */
93 #define EDMA_QWMTHRA 0x0620
94 #define EDMA_QWMTHRB 0x0624
95 #define EDMA_CCSTAT 0x0640
96
97 #define EDMA_M 0x1000 /* global channel registers */
98 #define EDMA_ECR 0x1008
99 #define EDMA_ECRH 0x100C
100 #define EDMA_SHADOW0 0x2000 /* 4 regions shadowing global channels */
101 #define EDMA_PARM 0x4000 /* 128 param entries */
102
103 #define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
104
105 #define EDMA_DCHMAP 0x0100 /* 64 registers */
106
107 /* CCCFG register */
108 #define GET_NUM_DMACH(x) (x & 0x7) /* bits 0-2 */
109 #define GET_NUM_PAENTRY(x) ((x & 0x7000) >> 12) /* bits 12-14 */
110 #define GET_NUM_EVQUE(x) ((x & 0x70000) >> 16) /* bits 16-18 */
111 #define GET_NUM_REGN(x) ((x & 0x300000) >> 20) /* bits 20-21 */
112 #define CHMAP_EXIST BIT(24)
113
114 #define EDMA_MAX_DMACH 64
115 #define EDMA_MAX_PARAMENTRY 512
116
117 /*****************************************************************************/
118
119 static void __iomem *edmacc_regs_base[EDMA_MAX_CC];
120
121 static inline unsigned int edma_read(unsigned ctlr, int offset)
122 {
123 return (unsigned int)__raw_readl(edmacc_regs_base[ctlr] + offset);
124 }
125
126 static inline void edma_write(unsigned ctlr, int offset, int val)
127 {
128 __raw_writel(val, edmacc_regs_base[ctlr] + offset);
129 }
130 static inline void edma_modify(unsigned ctlr, int offset, unsigned and,
131 unsigned or)
132 {
133 unsigned val = edma_read(ctlr, offset);
134 val &= and;
135 val |= or;
136 edma_write(ctlr, offset, val);
137 }
138 static inline void edma_and(unsigned ctlr, int offset, unsigned and)
139 {
140 unsigned val = edma_read(ctlr, offset);
141 val &= and;
142 edma_write(ctlr, offset, val);
143 }
144 static inline void edma_or(unsigned ctlr, int offset, unsigned or)
145 {
146 unsigned val = edma_read(ctlr, offset);
147 val |= or;
148 edma_write(ctlr, offset, val);
149 }
150 static inline unsigned int edma_read_array(unsigned ctlr, int offset, int i)
151 {
152 return edma_read(ctlr, offset + (i << 2));
153 }
154 static inline void edma_write_array(unsigned ctlr, int offset, int i,
155 unsigned val)
156 {
157 edma_write(ctlr, offset + (i << 2), val);
158 }
159 static inline void edma_modify_array(unsigned ctlr, int offset, int i,
160 unsigned and, unsigned or)
161 {
162 edma_modify(ctlr, offset + (i << 2), and, or);
163 }
164 static inline void edma_or_array(unsigned ctlr, int offset, int i, unsigned or)
165 {
166 edma_or(ctlr, offset + (i << 2), or);
167 }
168 static inline void edma_or_array2(unsigned ctlr, int offset, int i, int j,
169 unsigned or)
170 {
171 edma_or(ctlr, offset + ((i*2 + j) << 2), or);
172 }
173 static inline void edma_write_array2(unsigned ctlr, int offset, int i, int j,
174 unsigned val)
175 {
176 edma_write(ctlr, offset + ((i*2 + j) << 2), val);
177 }
178 static inline unsigned int edma_shadow0_read(unsigned ctlr, int offset)
179 {
180 return edma_read(ctlr, EDMA_SHADOW0 + offset);
181 }
182 static inline unsigned int edma_shadow0_read_array(unsigned ctlr, int offset,
183 int i)
184 {
185 return edma_read(ctlr, EDMA_SHADOW0 + offset + (i << 2));
186 }
187 static inline void edma_shadow0_write(unsigned ctlr, int offset, unsigned val)
188 {
189 edma_write(ctlr, EDMA_SHADOW0 + offset, val);
190 }
191 static inline void edma_shadow0_write_array(unsigned ctlr, int offset, int i,
192 unsigned val)
193 {
194 edma_write(ctlr, EDMA_SHADOW0 + offset + (i << 2), val);
195 }
196 static inline unsigned int edma_parm_read(unsigned ctlr, int offset,
197 int param_no)
198 {
199 return edma_read(ctlr, EDMA_PARM + offset + (param_no << 5));
200 }
201 static inline void edma_parm_write(unsigned ctlr, int offset, int param_no,
202 unsigned val)
203 {
204 edma_write(ctlr, EDMA_PARM + offset + (param_no << 5), val);
205 }
206 static inline void edma_parm_modify(unsigned ctlr, int offset, int param_no,
207 unsigned and, unsigned or)
208 {
209 edma_modify(ctlr, EDMA_PARM + offset + (param_no << 5), and, or);
210 }
211 static inline void edma_parm_and(unsigned ctlr, int offset, int param_no,
212 unsigned and)
213 {
214 edma_and(ctlr, EDMA_PARM + offset + (param_no << 5), and);
215 }
216 static inline void edma_parm_or(unsigned ctlr, int offset, int param_no,
217 unsigned or)
218 {
219 edma_or(ctlr, EDMA_PARM + offset + (param_no << 5), or);
220 }
221
222 static inline void set_bits(int offset, int len, unsigned long *p)
223 {
224 for (; len > 0; len--)
225 set_bit(offset + (len - 1), p);
226 }
227
228 static inline void clear_bits(int offset, int len, unsigned long *p)
229 {
230 for (; len > 0; len--)
231 clear_bit(offset + (len - 1), p);
232 }
233
234 /*****************************************************************************/
235
236 /* actual number of DMA channels and slots on this silicon */
237 struct edma {
238 /* how many dma resources of each type */
239 unsigned num_channels;
240 unsigned num_region;
241 unsigned num_slots;
242 unsigned num_tc;
243 enum dma_event_q default_queue;
244
245 /* list of channels with no even trigger; terminated by "-1" */
246 const s8 *noevent;
247
248 struct edma_soc_info *info;
249
250 /* The edma_inuse bit for each PaRAM slot is clear unless the
251 * channel is in use ... by ARM or DSP, for QDMA, or whatever.
252 */
253 DECLARE_BITMAP(edma_inuse, EDMA_MAX_PARAMENTRY);
254
255 /* The edma_unused bit for each channel is clear unless
256 * it is not being used on this platform. It uses a bit
257 * of SOC-specific initialization code.
258 */
259 DECLARE_BITMAP(edma_unused, EDMA_MAX_DMACH);
260
261 unsigned irq_res_start;
262 unsigned irq_res_end;
263
264 struct dma_interrupt_data {
265 void (*callback)(unsigned channel, unsigned short ch_status,
266 void *data);
267 void *data;
268 } intr_data[EDMA_MAX_DMACH];
269 };
270
271 static struct edma *edma_cc[EDMA_MAX_CC];
272 static int arch_num_cc;
273
274 /* dummy param set used to (re)initialize parameter RAM slots */
275 static const struct edmacc_param dummy_paramset = {
276 .link_bcntrld = 0xffff,
277 .ccnt = 1,
278 };
279
280 static const struct of_device_id edma_of_ids[] = {
281 { .compatible = "ti,edma3", },
282 {}
283 };
284
285 /*****************************************************************************/
286
287 static void map_dmach_queue(unsigned ctlr, unsigned ch_no,
288 enum dma_event_q queue_no)
289 {
290 int bit = (ch_no & 0x7) * 4;
291
292 /* default to low priority queue */
293 if (queue_no == EVENTQ_DEFAULT)
294 queue_no = edma_cc[ctlr]->default_queue;
295
296 queue_no &= 7;
297 edma_modify_array(ctlr, EDMA_DMAQNUM, (ch_no >> 3),
298 ~(0x7 << bit), queue_no << bit);
299 }
300
301 static void assign_priority_to_queue(unsigned ctlr, int queue_no,
302 int priority)
303 {
304 int bit = queue_no * 4;
305 edma_modify(ctlr, EDMA_QUEPRI, ~(0x7 << bit),
306 ((priority & 0x7) << bit));
307 }
308
309 /**
310 * map_dmach_param - Maps channel number to param entry number
311 *
312 * This maps the dma channel number to param entry numberter. In
313 * other words using the DMA channel mapping registers a param entry
314 * can be mapped to any channel
315 *
316 * Callers are responsible for ensuring the channel mapping logic is
317 * included in that particular EDMA variant (Eg : dm646x)
318 *
319 */
320 static void map_dmach_param(unsigned ctlr)
321 {
322 int i;
323 for (i = 0; i < EDMA_MAX_DMACH; i++)
324 edma_write_array(ctlr, EDMA_DCHMAP , i , (i << 5));
325 }
326
327 static inline void
328 setup_dma_interrupt(unsigned lch,
329 void (*callback)(unsigned channel, u16 ch_status, void *data),
330 void *data)
331 {
332 unsigned ctlr;
333
334 ctlr = EDMA_CTLR(lch);
335 lch = EDMA_CHAN_SLOT(lch);
336
337 if (!callback)
338 edma_shadow0_write_array(ctlr, SH_IECR, lch >> 5,
339 BIT(lch & 0x1f));
340
341 edma_cc[ctlr]->intr_data[lch].callback = callback;
342 edma_cc[ctlr]->intr_data[lch].data = data;
343
344 if (callback) {
345 edma_shadow0_write_array(ctlr, SH_ICR, lch >> 5,
346 BIT(lch & 0x1f));
347 edma_shadow0_write_array(ctlr, SH_IESR, lch >> 5,
348 BIT(lch & 0x1f));
349 }
350 }
351
352 static int irq2ctlr(int irq)
353 {
354 if (irq >= edma_cc[0]->irq_res_start && irq <= edma_cc[0]->irq_res_end)
355 return 0;
356 else if (irq >= edma_cc[1]->irq_res_start &&
357 irq <= edma_cc[1]->irq_res_end)
358 return 1;
359
360 return -1;
361 }
362
363 /******************************************************************************
364 *
365 * DMA interrupt handler
366 *
367 *****************************************************************************/
368 static irqreturn_t dma_irq_handler(int irq, void *data)
369 {
370 int ctlr;
371 u32 sh_ier;
372 u32 sh_ipr;
373 u32 bank;
374
375 ctlr = irq2ctlr(irq);
376 if (ctlr < 0)
377 return IRQ_NONE;
378
379 dev_dbg(data, "dma_irq_handler\n");
380
381 sh_ipr = edma_shadow0_read_array(ctlr, SH_IPR, 0);
382 if (!sh_ipr) {
383 sh_ipr = edma_shadow0_read_array(ctlr, SH_IPR, 1);
384 if (!sh_ipr)
385 return IRQ_NONE;
386 sh_ier = edma_shadow0_read_array(ctlr, SH_IER, 1);
387 bank = 1;
388 } else {
389 sh_ier = edma_shadow0_read_array(ctlr, SH_IER, 0);
390 bank = 0;
391 }
392
393 do {
394 u32 slot;
395 u32 channel;
396
397 dev_dbg(data, "IPR%d %08x\n", bank, sh_ipr);
398
399 slot = __ffs(sh_ipr);
400 sh_ipr &= ~(BIT(slot));
401
402 if (sh_ier & BIT(slot)) {
403 channel = (bank << 5) | slot;
404 /* Clear the corresponding IPR bits */
405 edma_shadow0_write_array(ctlr, SH_ICR, bank,
406 BIT(slot));
407 if (edma_cc[ctlr]->intr_data[channel].callback)
408 edma_cc[ctlr]->intr_data[channel].callback(
409 EDMA_CTLR_CHAN(ctlr, channel),
410 EDMA_DMA_COMPLETE,
411 edma_cc[ctlr]->intr_data[channel].data);
412 }
413 } while (sh_ipr);
414
415 edma_shadow0_write(ctlr, SH_IEVAL, 1);
416 return IRQ_HANDLED;
417 }
418
419 /******************************************************************************
420 *
421 * DMA error interrupt handler
422 *
423 *****************************************************************************/
424 static irqreturn_t dma_ccerr_handler(int irq, void *data)
425 {
426 int i;
427 int ctlr;
428 unsigned int cnt = 0;
429
430 ctlr = irq2ctlr(irq);
431 if (ctlr < 0)
432 return IRQ_NONE;
433
434 dev_dbg(data, "dma_ccerr_handler\n");
435
436 if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0) &&
437 (edma_read_array(ctlr, EDMA_EMR, 1) == 0) &&
438 (edma_read(ctlr, EDMA_QEMR) == 0) &&
439 (edma_read(ctlr, EDMA_CCERR) == 0))
440 return IRQ_NONE;
441
442 while (1) {
443 int j = -1;
444 if (edma_read_array(ctlr, EDMA_EMR, 0))
445 j = 0;
446 else if (edma_read_array(ctlr, EDMA_EMR, 1))
447 j = 1;
448 if (j >= 0) {
449 dev_dbg(data, "EMR%d %08x\n", j,
450 edma_read_array(ctlr, EDMA_EMR, j));
451 for (i = 0; i < 32; i++) {
452 int k = (j << 5) + i;
453 if (edma_read_array(ctlr, EDMA_EMR, j) &
454 BIT(i)) {
455 /* Clear the corresponding EMR bits */
456 edma_write_array(ctlr, EDMA_EMCR, j,
457 BIT(i));
458 /* Clear any SER */
459 edma_shadow0_write_array(ctlr, SH_SECR,
460 j, BIT(i));
461 if (edma_cc[ctlr]->intr_data[k].
462 callback) {
463 edma_cc[ctlr]->intr_data[k].
464 callback(
465 EDMA_CTLR_CHAN(ctlr, k),
466 EDMA_DMA_CC_ERROR,
467 edma_cc[ctlr]->intr_data
468 [k].data);
469 }
470 }
471 }
472 } else if (edma_read(ctlr, EDMA_QEMR)) {
473 dev_dbg(data, "QEMR %02x\n",
474 edma_read(ctlr, EDMA_QEMR));
475 for (i = 0; i < 8; i++) {
476 if (edma_read(ctlr, EDMA_QEMR) & BIT(i)) {
477 /* Clear the corresponding IPR bits */
478 edma_write(ctlr, EDMA_QEMCR, BIT(i));
479 edma_shadow0_write(ctlr, SH_QSECR,
480 BIT(i));
481
482 /* NOTE: not reported!! */
483 }
484 }
485 } else if (edma_read(ctlr, EDMA_CCERR)) {
486 dev_dbg(data, "CCERR %08x\n",
487 edma_read(ctlr, EDMA_CCERR));
488 /* FIXME: CCERR.BIT(16) ignored! much better
489 * to just write CCERRCLR with CCERR value...
490 */
491 for (i = 0; i < 8; i++) {
492 if (edma_read(ctlr, EDMA_CCERR) & BIT(i)) {
493 /* Clear the corresponding IPR bits */
494 edma_write(ctlr, EDMA_CCERRCLR, BIT(i));
495
496 /* NOTE: not reported!! */
497 }
498 }
499 }
500 if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0) &&
501 (edma_read_array(ctlr, EDMA_EMR, 1) == 0) &&
502 (edma_read(ctlr, EDMA_QEMR) == 0) &&
503 (edma_read(ctlr, EDMA_CCERR) == 0))
504 break;
505 cnt++;
506 if (cnt > 10)
507 break;
508 }
509 edma_write(ctlr, EDMA_EEVAL, 1);
510 return IRQ_HANDLED;
511 }
512
513 static int reserve_contiguous_slots(int ctlr, unsigned int id,
514 unsigned int num_slots,
515 unsigned int start_slot)
516 {
517 int i, j;
518 unsigned int count = num_slots;
519 int stop_slot = start_slot;
520 DECLARE_BITMAP(tmp_inuse, EDMA_MAX_PARAMENTRY);
521
522 for (i = start_slot; i < edma_cc[ctlr]->num_slots; ++i) {
523 j = EDMA_CHAN_SLOT(i);
524 if (!test_and_set_bit(j, edma_cc[ctlr]->edma_inuse)) {
525 /* Record our current beginning slot */
526 if (count == num_slots)
527 stop_slot = i;
528
529 count--;
530 set_bit(j, tmp_inuse);
531
532 if (count == 0)
533 break;
534 } else {
535 clear_bit(j, tmp_inuse);
536
537 if (id == EDMA_CONT_PARAMS_FIXED_EXACT) {
538 stop_slot = i;
539 break;
540 } else {
541 count = num_slots;
542 }
543 }
544 }
545
546 /*
547 * We have to clear any bits that we set
548 * if we run out parameter RAM slots, i.e we do find a set
549 * of contiguous parameter RAM slots but do not find the exact number
550 * requested as we may reach the total number of parameter RAM slots
551 */
552 if (i == edma_cc[ctlr]->num_slots)
553 stop_slot = i;
554
555 j = start_slot;
556 for_each_set_bit_from(j, tmp_inuse, stop_slot)
557 clear_bit(j, edma_cc[ctlr]->edma_inuse);
558
559 if (count)
560 return -EBUSY;
561
562 for (j = i - num_slots + 1; j <= i; ++j)
563 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(j),
564 &dummy_paramset, PARM_SIZE);
565
566 return EDMA_CTLR_CHAN(ctlr, i - num_slots + 1);
567 }
568
569 static int prepare_unused_channel_list(struct device *dev, void *data)
570 {
571 struct platform_device *pdev = to_platform_device(dev);
572 int i, count, ctlr;
573 struct of_phandle_args dma_spec;
574
575 if (dev->of_node) {
576 count = of_property_count_strings(dev->of_node, "dma-names");
577 if (count < 0)
578 return 0;
579 for (i = 0; i < count; i++) {
580 if (of_parse_phandle_with_args(dev->of_node, "dmas",
581 "#dma-cells", i,
582 &dma_spec))
583 continue;
584
585 if (!of_match_node(edma_of_ids, dma_spec.np)) {
586 of_node_put(dma_spec.np);
587 continue;
588 }
589
590 clear_bit(EDMA_CHAN_SLOT(dma_spec.args[0]),
591 edma_cc[0]->edma_unused);
592 of_node_put(dma_spec.np);
593 }
594 return 0;
595 }
596
597 /* For non-OF case */
598 for (i = 0; i < pdev->num_resources; i++) {
599 if ((pdev->resource[i].flags & IORESOURCE_DMA) &&
600 (int)pdev->resource[i].start >= 0) {
601 ctlr = EDMA_CTLR(pdev->resource[i].start);
602 clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
603 edma_cc[ctlr]->edma_unused);
604 }
605 }
606
607 return 0;
608 }
609
610 /*-----------------------------------------------------------------------*/
611
612 static bool unused_chan_list_done;
613
614 /* Resource alloc/free: dma channels, parameter RAM slots */
615
616 /**
617 * edma_alloc_channel - allocate DMA channel and paired parameter RAM
618 * @channel: specific channel to allocate; negative for "any unmapped channel"
619 * @callback: optional; to be issued on DMA completion or errors
620 * @data: passed to callback
621 * @eventq_no: an EVENTQ_* constant, used to choose which Transfer
622 * Controller (TC) executes requests using this channel. Use
623 * EVENTQ_DEFAULT unless you really need a high priority queue.
624 *
625 * This allocates a DMA channel and its associated parameter RAM slot.
626 * The parameter RAM is initialized to hold a dummy transfer.
627 *
628 * Normal use is to pass a specific channel number as @channel, to make
629 * use of hardware events mapped to that channel. When the channel will
630 * be used only for software triggering or event chaining, channels not
631 * mapped to hardware events (or mapped to unused events) are preferable.
632 *
633 * DMA transfers start from a channel using edma_start(), or by
634 * chaining. When the transfer described in that channel's parameter RAM
635 * slot completes, that slot's data may be reloaded through a link.
636 *
637 * DMA errors are only reported to the @callback associated with the
638 * channel driving that transfer, but transfer completion callbacks can
639 * be sent to another channel under control of the TCC field in
640 * the option word of the transfer's parameter RAM set. Drivers must not
641 * use DMA transfer completion callbacks for channels they did not allocate.
642 * (The same applies to TCC codes used in transfer chaining.)
643 *
644 * Returns the number of the channel, else negative errno.
645 */
646 int edma_alloc_channel(int channel,
647 void (*callback)(unsigned channel, u16 ch_status, void *data),
648 void *data,
649 enum dma_event_q eventq_no)
650 {
651 unsigned i, done = 0, ctlr = 0;
652 int ret = 0;
653
654 if (!unused_chan_list_done) {
655 /*
656 * Scan all the platform devices to find out the EDMA channels
657 * used and clear them in the unused list, making the rest
658 * available for ARM usage.
659 */
660 ret = bus_for_each_dev(&platform_bus_type, NULL, NULL,
661 prepare_unused_channel_list);
662 if (ret < 0)
663 return ret;
664
665 unused_chan_list_done = true;
666 }
667
668 if (channel >= 0) {
669 ctlr = EDMA_CTLR(channel);
670 channel = EDMA_CHAN_SLOT(channel);
671 }
672
673 if (channel < 0) {
674 for (i = 0; i < arch_num_cc; i++) {
675 channel = 0;
676 for (;;) {
677 channel = find_next_bit(edma_cc[i]->edma_unused,
678 edma_cc[i]->num_channels,
679 channel);
680 if (channel == edma_cc[i]->num_channels)
681 break;
682 if (!test_and_set_bit(channel,
683 edma_cc[i]->edma_inuse)) {
684 done = 1;
685 ctlr = i;
686 break;
687 }
688 channel++;
689 }
690 if (done)
691 break;
692 }
693 if (!done)
694 return -ENOMEM;
695 } else if (channel >= edma_cc[ctlr]->num_channels) {
696 return -EINVAL;
697 } else if (test_and_set_bit(channel, edma_cc[ctlr]->edma_inuse)) {
698 return -EBUSY;
699 }
700
701 /* ensure access through shadow region 0 */
702 edma_or_array2(ctlr, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
703
704 /* ensure no events are pending */
705 edma_stop(EDMA_CTLR_CHAN(ctlr, channel));
706 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
707 &dummy_paramset, PARM_SIZE);
708
709 if (callback)
710 setup_dma_interrupt(EDMA_CTLR_CHAN(ctlr, channel),
711 callback, data);
712
713 map_dmach_queue(ctlr, channel, eventq_no);
714
715 return EDMA_CTLR_CHAN(ctlr, channel);
716 }
717 EXPORT_SYMBOL(edma_alloc_channel);
718
719
720 /**
721 * edma_free_channel - deallocate DMA channel
722 * @channel: dma channel returned from edma_alloc_channel()
723 *
724 * This deallocates the DMA channel and associated parameter RAM slot
725 * allocated by edma_alloc_channel().
726 *
727 * Callers are responsible for ensuring the channel is inactive, and
728 * will not be reactivated by linking, chaining, or software calls to
729 * edma_start().
730 */
731 void edma_free_channel(unsigned channel)
732 {
733 unsigned ctlr;
734
735 ctlr = EDMA_CTLR(channel);
736 channel = EDMA_CHAN_SLOT(channel);
737
738 if (channel >= edma_cc[ctlr]->num_channels)
739 return;
740
741 setup_dma_interrupt(channel, NULL, NULL);
742 /* REVISIT should probably take out of shadow region 0 */
743
744 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
745 &dummy_paramset, PARM_SIZE);
746 clear_bit(channel, edma_cc[ctlr]->edma_inuse);
747 }
748 EXPORT_SYMBOL(edma_free_channel);
749
750 /**
751 * edma_alloc_slot - allocate DMA parameter RAM
752 * @slot: specific slot to allocate; negative for "any unused slot"
753 *
754 * This allocates a parameter RAM slot, initializing it to hold a
755 * dummy transfer. Slots allocated using this routine have not been
756 * mapped to a hardware DMA channel, and will normally be used by
757 * linking to them from a slot associated with a DMA channel.
758 *
759 * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
760 * slots may be allocated on behalf of DSP firmware.
761 *
762 * Returns the number of the slot, else negative errno.
763 */
764 int edma_alloc_slot(unsigned ctlr, int slot)
765 {
766 if (!edma_cc[ctlr])
767 return -EINVAL;
768
769 if (slot >= 0)
770 slot = EDMA_CHAN_SLOT(slot);
771
772 if (slot < 0) {
773 slot = edma_cc[ctlr]->num_channels;
774 for (;;) {
775 slot = find_next_zero_bit(edma_cc[ctlr]->edma_inuse,
776 edma_cc[ctlr]->num_slots, slot);
777 if (slot == edma_cc[ctlr]->num_slots)
778 return -ENOMEM;
779 if (!test_and_set_bit(slot, edma_cc[ctlr]->edma_inuse))
780 break;
781 }
782 } else if (slot < edma_cc[ctlr]->num_channels ||
783 slot >= edma_cc[ctlr]->num_slots) {
784 return -EINVAL;
785 } else if (test_and_set_bit(slot, edma_cc[ctlr]->edma_inuse)) {
786 return -EBUSY;
787 }
788
789 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
790 &dummy_paramset, PARM_SIZE);
791
792 return EDMA_CTLR_CHAN(ctlr, slot);
793 }
794 EXPORT_SYMBOL(edma_alloc_slot);
795
796 /**
797 * edma_free_slot - deallocate DMA parameter RAM
798 * @slot: parameter RAM slot returned from edma_alloc_slot()
799 *
800 * This deallocates the parameter RAM slot allocated by edma_alloc_slot().
801 * Callers are responsible for ensuring the slot is inactive, and will
802 * not be activated.
803 */
804 void edma_free_slot(unsigned slot)
805 {
806 unsigned ctlr;
807
808 ctlr = EDMA_CTLR(slot);
809 slot = EDMA_CHAN_SLOT(slot);
810
811 if (slot < edma_cc[ctlr]->num_channels ||
812 slot >= edma_cc[ctlr]->num_slots)
813 return;
814
815 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
816 &dummy_paramset, PARM_SIZE);
817 clear_bit(slot, edma_cc[ctlr]->edma_inuse);
818 }
819 EXPORT_SYMBOL(edma_free_slot);
820
821
822 /**
823 * edma_alloc_cont_slots- alloc contiguous parameter RAM slots
824 * The API will return the starting point of a set of
825 * contiguous parameter RAM slots that have been requested
826 *
827 * @id: can only be EDMA_CONT_PARAMS_ANY or EDMA_CONT_PARAMS_FIXED_EXACT
828 * or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
829 * @count: number of contiguous Paramter RAM slots
830 * @slot - the start value of Parameter RAM slot that should be passed if id
831 * is EDMA_CONT_PARAMS_FIXED_EXACT or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
832 *
833 * If id is EDMA_CONT_PARAMS_ANY then the API starts looking for a set of
834 * contiguous Parameter RAM slots from parameter RAM 64 in the case of
835 * DaVinci SOCs and 32 in the case of DA8xx SOCs.
836 *
837 * If id is EDMA_CONT_PARAMS_FIXED_EXACT then the API starts looking for a
838 * set of contiguous parameter RAM slots from the "slot" that is passed as an
839 * argument to the API.
840 *
841 * If id is EDMA_CONT_PARAMS_FIXED_NOT_EXACT then the API initially tries
842 * starts looking for a set of contiguous parameter RAMs from the "slot"
843 * that is passed as an argument to the API. On failure the API will try to
844 * find a set of contiguous Parameter RAM slots from the remaining Parameter
845 * RAM slots
846 */
847 int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
848 {
849 /*
850 * The start slot requested should be greater than
851 * the number of channels and lesser than the total number
852 * of slots
853 */
854 if ((id != EDMA_CONT_PARAMS_ANY) &&
855 (slot < edma_cc[ctlr]->num_channels ||
856 slot >= edma_cc[ctlr]->num_slots))
857 return -EINVAL;
858
859 /*
860 * The number of parameter RAM slots requested cannot be less than 1
861 * and cannot be more than the number of slots minus the number of
862 * channels
863 */
864 if (count < 1 || count >
865 (edma_cc[ctlr]->num_slots - edma_cc[ctlr]->num_channels))
866 return -EINVAL;
867
868 switch (id) {
869 case EDMA_CONT_PARAMS_ANY:
870 return reserve_contiguous_slots(ctlr, id, count,
871 edma_cc[ctlr]->num_channels);
872 case EDMA_CONT_PARAMS_FIXED_EXACT:
873 case EDMA_CONT_PARAMS_FIXED_NOT_EXACT:
874 return reserve_contiguous_slots(ctlr, id, count, slot);
875 default:
876 return -EINVAL;
877 }
878
879 }
880 EXPORT_SYMBOL(edma_alloc_cont_slots);
881
882 /**
883 * edma_free_cont_slots - deallocate DMA parameter RAM slots
884 * @slot: first parameter RAM of a set of parameter RAM slots to be freed
885 * @count: the number of contiguous parameter RAM slots to be freed
886 *
887 * This deallocates the parameter RAM slots allocated by
888 * edma_alloc_cont_slots.
889 * Callers/applications need to keep track of sets of contiguous
890 * parameter RAM slots that have been allocated using the edma_alloc_cont_slots
891 * API.
892 * Callers are responsible for ensuring the slots are inactive, and will
893 * not be activated.
894 */
895 int edma_free_cont_slots(unsigned slot, int count)
896 {
897 unsigned ctlr, slot_to_free;
898 int i;
899
900 ctlr = EDMA_CTLR(slot);
901 slot = EDMA_CHAN_SLOT(slot);
902
903 if (slot < edma_cc[ctlr]->num_channels ||
904 slot >= edma_cc[ctlr]->num_slots ||
905 count < 1)
906 return -EINVAL;
907
908 for (i = slot; i < slot + count; ++i) {
909 ctlr = EDMA_CTLR(i);
910 slot_to_free = EDMA_CHAN_SLOT(i);
911
912 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot_to_free),
913 &dummy_paramset, PARM_SIZE);
914 clear_bit(slot_to_free, edma_cc[ctlr]->edma_inuse);
915 }
916
917 return 0;
918 }
919 EXPORT_SYMBOL(edma_free_cont_slots);
920
921 /*-----------------------------------------------------------------------*/
922
923 /* Parameter RAM operations (i) -- read/write partial slots */
924
925 /**
926 * edma_set_src - set initial DMA source address in parameter RAM slot
927 * @slot: parameter RAM slot being configured
928 * @src_port: physical address of source (memory, controller FIFO, etc)
929 * @addressMode: INCR, except in very rare cases
930 * @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
931 * width to use when addressing the fifo (e.g. W8BIT, W32BIT)
932 *
933 * Note that the source address is modified during the DMA transfer
934 * according to edma_set_src_index().
935 */
936 void edma_set_src(unsigned slot, dma_addr_t src_port,
937 enum address_mode mode, enum fifo_width width)
938 {
939 unsigned ctlr;
940
941 ctlr = EDMA_CTLR(slot);
942 slot = EDMA_CHAN_SLOT(slot);
943
944 if (slot < edma_cc[ctlr]->num_slots) {
945 unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
946
947 if (mode) {
948 /* set SAM and program FWID */
949 i = (i & ~(EDMA_FWID)) | (SAM | ((width & 0x7) << 8));
950 } else {
951 /* clear SAM */
952 i &= ~SAM;
953 }
954 edma_parm_write(ctlr, PARM_OPT, slot, i);
955
956 /* set the source port address
957 in source register of param structure */
958 edma_parm_write(ctlr, PARM_SRC, slot, src_port);
959 }
960 }
961 EXPORT_SYMBOL(edma_set_src);
962
963 /**
964 * edma_set_dest - set initial DMA destination address in parameter RAM slot
965 * @slot: parameter RAM slot being configured
966 * @dest_port: physical address of destination (memory, controller FIFO, etc)
967 * @addressMode: INCR, except in very rare cases
968 * @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
969 * width to use when addressing the fifo (e.g. W8BIT, W32BIT)
970 *
971 * Note that the destination address is modified during the DMA transfer
972 * according to edma_set_dest_index().
973 */
974 void edma_set_dest(unsigned slot, dma_addr_t dest_port,
975 enum address_mode mode, enum fifo_width width)
976 {
977 unsigned ctlr;
978
979 ctlr = EDMA_CTLR(slot);
980 slot = EDMA_CHAN_SLOT(slot);
981
982 if (slot < edma_cc[ctlr]->num_slots) {
983 unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
984
985 if (mode) {
986 /* set DAM and program FWID */
987 i = (i & ~(EDMA_FWID)) | (DAM | ((width & 0x7) << 8));
988 } else {
989 /* clear DAM */
990 i &= ~DAM;
991 }
992 edma_parm_write(ctlr, PARM_OPT, slot, i);
993 /* set the destination port address
994 in dest register of param structure */
995 edma_parm_write(ctlr, PARM_DST, slot, dest_port);
996 }
997 }
998 EXPORT_SYMBOL(edma_set_dest);
999
1000 /**
1001 * edma_get_position - returns the current transfer point
1002 * @slot: parameter RAM slot being examined
1003 * @dst: true selects the dest position, false the source
1004 *
1005 * Returns the position of the current active slot
1006 */
1007 dma_addr_t edma_get_position(unsigned slot, bool dst)
1008 {
1009 u32 offs, ctlr = EDMA_CTLR(slot);
1010
1011 slot = EDMA_CHAN_SLOT(slot);
1012
1013 offs = PARM_OFFSET(slot);
1014 offs += dst ? PARM_DST : PARM_SRC;
1015
1016 return edma_read(ctlr, offs);
1017 }
1018
1019 /**
1020 * edma_set_src_index - configure DMA source address indexing
1021 * @slot: parameter RAM slot being configured
1022 * @src_bidx: byte offset between source arrays in a frame
1023 * @src_cidx: byte offset between source frames in a block
1024 *
1025 * Offsets are specified to support either contiguous or discontiguous
1026 * memory transfers, or repeated access to a hardware register, as needed.
1027 * When accessing hardware registers, both offsets are normally zero.
1028 */
1029 void edma_set_src_index(unsigned slot, s16 src_bidx, s16 src_cidx)
1030 {
1031 unsigned ctlr;
1032
1033 ctlr = EDMA_CTLR(slot);
1034 slot = EDMA_CHAN_SLOT(slot);
1035
1036 if (slot < edma_cc[ctlr]->num_slots) {
1037 edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
1038 0xffff0000, src_bidx);
1039 edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
1040 0xffff0000, src_cidx);
1041 }
1042 }
1043 EXPORT_SYMBOL(edma_set_src_index);
1044
1045 /**
1046 * edma_set_dest_index - configure DMA destination address indexing
1047 * @slot: parameter RAM slot being configured
1048 * @dest_bidx: byte offset between destination arrays in a frame
1049 * @dest_cidx: byte offset between destination frames in a block
1050 *
1051 * Offsets are specified to support either contiguous or discontiguous
1052 * memory transfers, or repeated access to a hardware register, as needed.
1053 * When accessing hardware registers, both offsets are normally zero.
1054 */
1055 void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx)
1056 {
1057 unsigned ctlr;
1058
1059 ctlr = EDMA_CTLR(slot);
1060 slot = EDMA_CHAN_SLOT(slot);
1061
1062 if (slot < edma_cc[ctlr]->num_slots) {
1063 edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
1064 0x0000ffff, dest_bidx << 16);
1065 edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
1066 0x0000ffff, dest_cidx << 16);
1067 }
1068 }
1069 EXPORT_SYMBOL(edma_set_dest_index);
1070
1071 /**
1072 * edma_set_transfer_params - configure DMA transfer parameters
1073 * @slot: parameter RAM slot being configured
1074 * @acnt: how many bytes per array (at least one)
1075 * @bcnt: how many arrays per frame (at least one)
1076 * @ccnt: how many frames per block (at least one)
1077 * @bcnt_rld: used only for A-Synchronized transfers; this specifies
1078 * the value to reload into bcnt when it decrements to zero
1079 * @sync_mode: ASYNC or ABSYNC
1080 *
1081 * See the EDMA3 documentation to understand how to configure and link
1082 * transfers using the fields in PaRAM slots. If you are not doing it
1083 * all at once with edma_write_slot(), you will use this routine
1084 * plus two calls each for source and destination, setting the initial
1085 * address and saying how to index that address.
1086 *
1087 * An example of an A-Synchronized transfer is a serial link using a
1088 * single word shift register. In that case, @acnt would be equal to
1089 * that word size; the serial controller issues a DMA synchronization
1090 * event to transfer each word, and memory access by the DMA transfer
1091 * controller will be word-at-a-time.
1092 *
1093 * An example of an AB-Synchronized transfer is a device using a FIFO.
1094 * In that case, @acnt equals the FIFO width and @bcnt equals its depth.
1095 * The controller with the FIFO issues DMA synchronization events when
1096 * the FIFO threshold is reached, and the DMA transfer controller will
1097 * transfer one frame to (or from) the FIFO. It will probably use
1098 * efficient burst modes to access memory.
1099 */
1100 void edma_set_transfer_params(unsigned slot,
1101 u16 acnt, u16 bcnt, u16 ccnt,
1102 u16 bcnt_rld, enum sync_dimension sync_mode)
1103 {
1104 unsigned ctlr;
1105
1106 ctlr = EDMA_CTLR(slot);
1107 slot = EDMA_CHAN_SLOT(slot);
1108
1109 if (slot < edma_cc[ctlr]->num_slots) {
1110 edma_parm_modify(ctlr, PARM_LINK_BCNTRLD, slot,
1111 0x0000ffff, bcnt_rld << 16);
1112 if (sync_mode == ASYNC)
1113 edma_parm_and(ctlr, PARM_OPT, slot, ~SYNCDIM);
1114 else
1115 edma_parm_or(ctlr, PARM_OPT, slot, SYNCDIM);
1116 /* Set the acount, bcount, ccount registers */
1117 edma_parm_write(ctlr, PARM_A_B_CNT, slot, (bcnt << 16) | acnt);
1118 edma_parm_write(ctlr, PARM_CCNT, slot, ccnt);
1119 }
1120 }
1121 EXPORT_SYMBOL(edma_set_transfer_params);
1122
1123 /**
1124 * edma_link - link one parameter RAM slot to another
1125 * @from: parameter RAM slot originating the link
1126 * @to: parameter RAM slot which is the link target
1127 *
1128 * The originating slot should not be part of any active DMA transfer.
1129 */
1130 void edma_link(unsigned from, unsigned to)
1131 {
1132 unsigned ctlr_from, ctlr_to;
1133
1134 ctlr_from = EDMA_CTLR(from);
1135 from = EDMA_CHAN_SLOT(from);
1136 ctlr_to = EDMA_CTLR(to);
1137 to = EDMA_CHAN_SLOT(to);
1138
1139 if (from >= edma_cc[ctlr_from]->num_slots)
1140 return;
1141 if (to >= edma_cc[ctlr_to]->num_slots)
1142 return;
1143 edma_parm_modify(ctlr_from, PARM_LINK_BCNTRLD, from, 0xffff0000,
1144 PARM_OFFSET(to));
1145 }
1146 EXPORT_SYMBOL(edma_link);
1147
1148 /**
1149 * edma_unlink - cut link from one parameter RAM slot
1150 * @from: parameter RAM slot originating the link
1151 *
1152 * The originating slot should not be part of any active DMA transfer.
1153 * Its link is set to 0xffff.
1154 */
1155 void edma_unlink(unsigned from)
1156 {
1157 unsigned ctlr;
1158
1159 ctlr = EDMA_CTLR(from);
1160 from = EDMA_CHAN_SLOT(from);
1161
1162 if (from >= edma_cc[ctlr]->num_slots)
1163 return;
1164 edma_parm_or(ctlr, PARM_LINK_BCNTRLD, from, 0xffff);
1165 }
1166 EXPORT_SYMBOL(edma_unlink);
1167
1168 /*-----------------------------------------------------------------------*/
1169
1170 /* Parameter RAM operations (ii) -- read/write whole parameter sets */
1171
1172 /**
1173 * edma_write_slot - write parameter RAM data for slot
1174 * @slot: number of parameter RAM slot being modified
1175 * @param: data to be written into parameter RAM slot
1176 *
1177 * Use this to assign all parameters of a transfer at once. This
1178 * allows more efficient setup of transfers than issuing multiple
1179 * calls to set up those parameters in small pieces, and provides
1180 * complete control over all transfer options.
1181 */
1182 void edma_write_slot(unsigned slot, const struct edmacc_param *param)
1183 {
1184 unsigned ctlr;
1185
1186 ctlr = EDMA_CTLR(slot);
1187 slot = EDMA_CHAN_SLOT(slot);
1188
1189 if (slot >= edma_cc[ctlr]->num_slots)
1190 return;
1191 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot), param,
1192 PARM_SIZE);
1193 }
1194 EXPORT_SYMBOL(edma_write_slot);
1195
1196 /**
1197 * edma_read_slot - read parameter RAM data from slot
1198 * @slot: number of parameter RAM slot being copied
1199 * @param: where to store copy of parameter RAM data
1200 *
1201 * Use this to read data from a parameter RAM slot, perhaps to
1202 * save them as a template for later reuse.
1203 */
1204 void edma_read_slot(unsigned slot, struct edmacc_param *param)
1205 {
1206 unsigned ctlr;
1207
1208 ctlr = EDMA_CTLR(slot);
1209 slot = EDMA_CHAN_SLOT(slot);
1210
1211 if (slot >= edma_cc[ctlr]->num_slots)
1212 return;
1213 memcpy_fromio(param, edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
1214 PARM_SIZE);
1215 }
1216 EXPORT_SYMBOL(edma_read_slot);
1217
1218 /*-----------------------------------------------------------------------*/
1219
1220 /* Various EDMA channel control operations */
1221
1222 /**
1223 * edma_pause - pause dma on a channel
1224 * @channel: on which edma_start() has been called
1225 *
1226 * This temporarily disables EDMA hardware events on the specified channel,
1227 * preventing them from triggering new transfers on its behalf
1228 */
1229 void edma_pause(unsigned channel)
1230 {
1231 unsigned ctlr;
1232
1233 ctlr = EDMA_CTLR(channel);
1234 channel = EDMA_CHAN_SLOT(channel);
1235
1236 if (channel < edma_cc[ctlr]->num_channels) {
1237 unsigned int mask = BIT(channel & 0x1f);
1238
1239 edma_shadow0_write_array(ctlr, SH_EECR, channel >> 5, mask);
1240 }
1241 }
1242 EXPORT_SYMBOL(edma_pause);
1243
1244 /**
1245 * edma_resume - resumes dma on a paused channel
1246 * @channel: on which edma_pause() has been called
1247 *
1248 * This re-enables EDMA hardware events on the specified channel.
1249 */
1250 void edma_resume(unsigned channel)
1251 {
1252 unsigned ctlr;
1253
1254 ctlr = EDMA_CTLR(channel);
1255 channel = EDMA_CHAN_SLOT(channel);
1256
1257 if (channel < edma_cc[ctlr]->num_channels) {
1258 unsigned int mask = BIT(channel & 0x1f);
1259
1260 edma_shadow0_write_array(ctlr, SH_EESR, channel >> 5, mask);
1261 }
1262 }
1263 EXPORT_SYMBOL(edma_resume);
1264
1265 int edma_trigger_channel(unsigned channel)
1266 {
1267 unsigned ctlr;
1268 unsigned int mask;
1269
1270 ctlr = EDMA_CTLR(channel);
1271 channel = EDMA_CHAN_SLOT(channel);
1272 mask = BIT(channel & 0x1f);
1273
1274 edma_shadow0_write_array(ctlr, SH_ESR, (channel >> 5), mask);
1275
1276 pr_debug("EDMA: ESR%d %08x\n", (channel >> 5),
1277 edma_shadow0_read_array(ctlr, SH_ESR, (channel >> 5)));
1278 return 0;
1279 }
1280 EXPORT_SYMBOL(edma_trigger_channel);
1281
1282 /**
1283 * edma_start - start dma on a channel
1284 * @channel: channel being activated
1285 *
1286 * Channels with event associations will be triggered by their hardware
1287 * events, and channels without such associations will be triggered by
1288 * software. (At this writing there is no interface for using software
1289 * triggers except with channels that don't support hardware triggers.)
1290 *
1291 * Returns zero on success, else negative errno.
1292 */
1293 int edma_start(unsigned channel)
1294 {
1295 unsigned ctlr;
1296
1297 ctlr = EDMA_CTLR(channel);
1298 channel = EDMA_CHAN_SLOT(channel);
1299
1300 if (channel < edma_cc[ctlr]->num_channels) {
1301 int j = channel >> 5;
1302 unsigned int mask = BIT(channel & 0x1f);
1303
1304 /* EDMA channels without event association */
1305 if (test_bit(channel, edma_cc[ctlr]->edma_unused)) {
1306 pr_debug("EDMA: ESR%d %08x\n", j,
1307 edma_shadow0_read_array(ctlr, SH_ESR, j));
1308 edma_shadow0_write_array(ctlr, SH_ESR, j, mask);
1309 return 0;
1310 }
1311
1312 /* EDMA channel with event association */
1313 pr_debug("EDMA: ER%d %08x\n", j,
1314 edma_shadow0_read_array(ctlr, SH_ER, j));
1315 /* Clear any pending event or error */
1316 edma_write_array(ctlr, EDMA_ECR, j, mask);
1317 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1318 /* Clear any SER */
1319 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1320 edma_shadow0_write_array(ctlr, SH_EESR, j, mask);
1321 pr_debug("EDMA: EER%d %08x\n", j,
1322 edma_shadow0_read_array(ctlr, SH_EER, j));
1323 return 0;
1324 }
1325
1326 return -EINVAL;
1327 }
1328 EXPORT_SYMBOL(edma_start);
1329
1330 /**
1331 * edma_stop - stops dma on the channel passed
1332 * @channel: channel being deactivated
1333 *
1334 * When @lch is a channel, any active transfer is paused and
1335 * all pending hardware events are cleared. The current transfer
1336 * may not be resumed, and the channel's Parameter RAM should be
1337 * reinitialized before being reused.
1338 */
1339 void edma_stop(unsigned channel)
1340 {
1341 unsigned ctlr;
1342
1343 ctlr = EDMA_CTLR(channel);
1344 channel = EDMA_CHAN_SLOT(channel);
1345
1346 if (channel < edma_cc[ctlr]->num_channels) {
1347 int j = channel >> 5;
1348 unsigned int mask = BIT(channel & 0x1f);
1349
1350 edma_shadow0_write_array(ctlr, SH_EECR, j, mask);
1351 edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
1352 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1353 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1354
1355 pr_debug("EDMA: EER%d %08x\n", j,
1356 edma_shadow0_read_array(ctlr, SH_EER, j));
1357
1358 /* REVISIT: consider guarding against inappropriate event
1359 * chaining by overwriting with dummy_paramset.
1360 */
1361 }
1362 }
1363 EXPORT_SYMBOL(edma_stop);
1364
1365 /******************************************************************************
1366 *
1367 * It cleans ParamEntry qand bring back EDMA to initial state if media has
1368 * been removed before EDMA has finished.It is usedful for removable media.
1369 * Arguments:
1370 * ch_no - channel no
1371 *
1372 * Return: zero on success, or corresponding error no on failure
1373 *
1374 * FIXME this should not be needed ... edma_stop() should suffice.
1375 *
1376 *****************************************************************************/
1377
1378 void edma_clean_channel(unsigned channel)
1379 {
1380 unsigned ctlr;
1381
1382 ctlr = EDMA_CTLR(channel);
1383 channel = EDMA_CHAN_SLOT(channel);
1384
1385 if (channel < edma_cc[ctlr]->num_channels) {
1386 int j = (channel >> 5);
1387 unsigned int mask = BIT(channel & 0x1f);
1388
1389 pr_debug("EDMA: EMR%d %08x\n", j,
1390 edma_read_array(ctlr, EDMA_EMR, j));
1391 edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
1392 /* Clear the corresponding EMR bits */
1393 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1394 /* Clear any SER */
1395 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1396 edma_write(ctlr, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
1397 }
1398 }
1399 EXPORT_SYMBOL(edma_clean_channel);
1400
1401 /*
1402 * edma_clear_event - clear an outstanding event on the DMA channel
1403 * Arguments:
1404 * channel - channel number
1405 */
1406 void edma_clear_event(unsigned channel)
1407 {
1408 unsigned ctlr;
1409
1410 ctlr = EDMA_CTLR(channel);
1411 channel = EDMA_CHAN_SLOT(channel);
1412
1413 if (channel >= edma_cc[ctlr]->num_channels)
1414 return;
1415 if (channel < 32)
1416 edma_write(ctlr, EDMA_ECR, BIT(channel));
1417 else
1418 edma_write(ctlr, EDMA_ECRH, BIT(channel - 32));
1419 }
1420 EXPORT_SYMBOL(edma_clear_event);
1421
1422 /*
1423 * edma_assign_channel_eventq - move given channel to desired eventq
1424 * Arguments:
1425 * channel - channel number
1426 * eventq_no - queue to move the channel
1427 *
1428 * Can be used to move a channel to a selected event queue.
1429 */
1430 void edma_assign_channel_eventq(unsigned channel, enum dma_event_q eventq_no)
1431 {
1432 unsigned ctlr;
1433
1434 ctlr = EDMA_CTLR(channel);
1435 channel = EDMA_CHAN_SLOT(channel);
1436
1437 if (channel >= edma_cc[ctlr]->num_channels)
1438 return;
1439
1440 /* default to low priority queue */
1441 if (eventq_no == EVENTQ_DEFAULT)
1442 eventq_no = edma_cc[ctlr]->default_queue;
1443 if (eventq_no >= edma_cc[ctlr]->num_tc)
1444 return;
1445
1446 map_dmach_queue(ctlr, channel, eventq_no);
1447 }
1448 EXPORT_SYMBOL(edma_assign_channel_eventq);
1449
1450 static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
1451 struct edma *edma_cc, int cc_id)
1452 {
1453 int i;
1454 u32 value, cccfg;
1455 s8 (*queue_priority_map)[2];
1456
1457 /* Decode the eDMA3 configuration from CCCFG register */
1458 cccfg = edma_read(cc_id, EDMA_CCCFG);
1459
1460 value = GET_NUM_REGN(cccfg);
1461 edma_cc->num_region = BIT(value);
1462
1463 value = GET_NUM_DMACH(cccfg);
1464 edma_cc->num_channels = BIT(value + 1);
1465
1466 value = GET_NUM_PAENTRY(cccfg);
1467 edma_cc->num_slots = BIT(value + 4);
1468
1469 value = GET_NUM_EVQUE(cccfg);
1470 edma_cc->num_tc = value + 1;
1471
1472 dev_dbg(dev, "eDMA3 CC%d HW configuration (cccfg: 0x%08x):\n", cc_id,
1473 cccfg);
1474 dev_dbg(dev, "num_region: %u\n", edma_cc->num_region);
1475 dev_dbg(dev, "num_channel: %u\n", edma_cc->num_channels);
1476 dev_dbg(dev, "num_slot: %u\n", edma_cc->num_slots);
1477 dev_dbg(dev, "num_tc: %u\n", edma_cc->num_tc);
1478
1479 /* Nothing need to be done if queue priority is provided */
1480 if (pdata->queue_priority_mapping)
1481 return 0;
1482
1483 /*
1484 * Configure TC/queue priority as follows:
1485 * Q0 - priority 0
1486 * Q1 - priority 1
1487 * Q2 - priority 2
1488 * ...
1489 * The meaning of priority numbers: 0 highest priority, 7 lowest
1490 * priority. So Q0 is the highest priority queue and the last queue has
1491 * the lowest priority.
1492 */
1493 queue_priority_map = devm_kzalloc(dev,
1494 (edma_cc->num_tc + 1) * sizeof(s8),
1495 GFP_KERNEL);
1496 if (!queue_priority_map)
1497 return -ENOMEM;
1498
1499 for (i = 0; i < edma_cc->num_tc; i++) {
1500 queue_priority_map[i][0] = i;
1501 queue_priority_map[i][1] = i;
1502 }
1503 queue_priority_map[i][0] = -1;
1504 queue_priority_map[i][1] = -1;
1505
1506 pdata->queue_priority_mapping = queue_priority_map;
1507 /* Default queue has the lowest priority */
1508 pdata->default_queue = i - 1;
1509
1510 return 0;
1511 }
1512
1513 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DMADEVICES)
1514
1515 static int edma_xbar_event_map(struct device *dev, struct device_node *node,
1516 struct edma_soc_info *pdata, size_t sz)
1517 {
1518 const char pname[] = "ti,edma-xbar-event-map";
1519 struct resource res;
1520 void __iomem *xbar;
1521 s16 (*xbar_chans)[2];
1522 size_t nelm = sz / sizeof(s16);
1523 u32 shift, offset, mux;
1524 int ret, i;
1525
1526 xbar_chans = devm_kzalloc(dev, (nelm + 2) * sizeof(s16), GFP_KERNEL);
1527 if (!xbar_chans)
1528 return -ENOMEM;
1529
1530 ret = of_address_to_resource(node, 1, &res);
1531 if (ret)
1532 return -ENOMEM;
1533
1534 xbar = devm_ioremap(dev, res.start, resource_size(&res));
1535 if (!xbar)
1536 return -ENOMEM;
1537
1538 ret = of_property_read_u16_array(node, pname, (u16 *)xbar_chans, nelm);
1539 if (ret)
1540 return -EIO;
1541
1542 /* Invalidate last entry for the other user of this mess */
1543 nelm >>= 1;
1544 xbar_chans[nelm][0] = xbar_chans[nelm][1] = -1;
1545
1546 for (i = 0; i < nelm; i++) {
1547 shift = (xbar_chans[i][1] & 0x03) << 3;
1548 offset = xbar_chans[i][1] & 0xfffffffc;
1549 mux = readl(xbar + offset);
1550 mux &= ~(0xff << shift);
1551 mux |= xbar_chans[i][0] << shift;
1552 writel(mux, (xbar + offset));
1553 }
1554
1555 pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
1556 return 0;
1557 }
1558
1559 static int edma_of_parse_dt(struct device *dev,
1560 struct device_node *node,
1561 struct edma_soc_info *pdata)
1562 {
1563 int ret = 0;
1564 struct property *prop;
1565 size_t sz;
1566 struct edma_rsv_info *rsv_info;
1567
1568 rsv_info = devm_kzalloc(dev, sizeof(struct edma_rsv_info), GFP_KERNEL);
1569 if (!rsv_info)
1570 return -ENOMEM;
1571 pdata->rsv = rsv_info;
1572
1573 prop = of_find_property(node, "ti,edma-xbar-event-map", &sz);
1574 if (prop)
1575 ret = edma_xbar_event_map(dev, node, pdata, sz);
1576
1577 return ret;
1578 }
1579
1580 static struct of_dma_filter_info edma_filter_info = {
1581 .filter_fn = edma_filter_fn,
1582 };
1583
1584 static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
1585 struct device_node *node)
1586 {
1587 struct edma_soc_info *info;
1588 int ret;
1589
1590 info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
1591 if (!info)
1592 return ERR_PTR(-ENOMEM);
1593
1594 ret = edma_of_parse_dt(dev, node, info);
1595 if (ret)
1596 return ERR_PTR(ret);
1597
1598 dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap);
1599 dma_cap_set(DMA_CYCLIC, edma_filter_info.dma_cap);
1600 of_dma_controller_register(dev->of_node, of_dma_simple_xlate,
1601 &edma_filter_info);
1602
1603 return info;
1604 }
1605 #else
1606 static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
1607 struct device_node *node)
1608 {
1609 return ERR_PTR(-ENOSYS);
1610 }
1611 #endif
1612
1613 static int edma_probe(struct platform_device *pdev)
1614 {
1615 struct edma_soc_info **info = pdev->dev.platform_data;
1616 struct edma_soc_info *ninfo[EDMA_MAX_CC] = {NULL};
1617 s8 (*queue_priority_mapping)[2];
1618 int i, j, off, ln, found = 0;
1619 int status = -1;
1620 const s16 (*rsv_chans)[2];
1621 const s16 (*rsv_slots)[2];
1622 const s16 (*xbar_chans)[2];
1623 int irq[EDMA_MAX_CC] = {0, 0};
1624 int err_irq[EDMA_MAX_CC] = {0, 0};
1625 struct resource *r[EDMA_MAX_CC] = {NULL};
1626 struct resource res[EDMA_MAX_CC];
1627 char res_name[10];
1628 struct device_node *node = pdev->dev.of_node;
1629 struct device *dev = &pdev->dev;
1630 int ret;
1631 struct platform_device_info edma_dev_info = {
1632 .name = "edma-dma-engine",
1633 .dma_mask = DMA_BIT_MASK(32),
1634 .parent = &pdev->dev,
1635 };
1636
1637 if (node) {
1638 /* Check if this is a second instance registered */
1639 if (arch_num_cc) {
1640 dev_err(dev, "only one EDMA instance is supported via DT\n");
1641 return -ENODEV;
1642 }
1643
1644 ninfo[0] = edma_setup_info_from_dt(dev, node);
1645 if (IS_ERR(ninfo[0])) {
1646 dev_err(dev, "failed to get DT data\n");
1647 return PTR_ERR(ninfo[0]);
1648 }
1649
1650 info = ninfo;
1651 }
1652
1653 if (!info)
1654 return -ENODEV;
1655
1656 pm_runtime_enable(dev);
1657 ret = pm_runtime_get_sync(dev);
1658 if (ret < 0) {
1659 dev_err(dev, "pm_runtime_get_sync() failed\n");
1660 return ret;
1661 }
1662
1663 for (j = 0; j < EDMA_MAX_CC; j++) {
1664 if (!info[j]) {
1665 if (!found)
1666 return -ENODEV;
1667 break;
1668 }
1669 if (node) {
1670 ret = of_address_to_resource(node, j, &res[j]);
1671 if (!ret)
1672 r[j] = &res[j];
1673 } else {
1674 sprintf(res_name, "edma_cc%d", j);
1675 r[j] = platform_get_resource_byname(pdev,
1676 IORESOURCE_MEM,
1677 res_name);
1678 }
1679 if (!r[j]) {
1680 if (found)
1681 break;
1682 else
1683 return -ENODEV;
1684 } else {
1685 found = 1;
1686 }
1687
1688 edmacc_regs_base[j] = devm_ioremap_resource(&pdev->dev, r[j]);
1689 if (IS_ERR(edmacc_regs_base[j]))
1690 return PTR_ERR(edmacc_regs_base[j]);
1691
1692 edma_cc[j] = devm_kzalloc(&pdev->dev, sizeof(struct edma),
1693 GFP_KERNEL);
1694 if (!edma_cc[j])
1695 return -ENOMEM;
1696
1697 /* Get eDMA3 configuration from IP */
1698 ret = edma_setup_from_hw(dev, info[j], edma_cc[j], j);
1699 if (ret)
1700 return ret;
1701
1702 edma_cc[j]->default_queue = info[j]->default_queue;
1703
1704 dev_dbg(&pdev->dev, "DMA REG BASE ADDR=%p\n",
1705 edmacc_regs_base[j]);
1706
1707 for (i = 0; i < edma_cc[j]->num_slots; i++)
1708 memcpy_toio(edmacc_regs_base[j] + PARM_OFFSET(i),
1709 &dummy_paramset, PARM_SIZE);
1710
1711 /* Mark all channels as unused */
1712 memset(edma_cc[j]->edma_unused, 0xff,
1713 sizeof(edma_cc[j]->edma_unused));
1714
1715 if (info[j]->rsv) {
1716
1717 /* Clear the reserved channels in unused list */
1718 rsv_chans = info[j]->rsv->rsv_chans;
1719 if (rsv_chans) {
1720 for (i = 0; rsv_chans[i][0] != -1; i++) {
1721 off = rsv_chans[i][0];
1722 ln = rsv_chans[i][1];
1723 clear_bits(off, ln,
1724 edma_cc[j]->edma_unused);
1725 }
1726 }
1727
1728 /* Set the reserved slots in inuse list */
1729 rsv_slots = info[j]->rsv->rsv_slots;
1730 if (rsv_slots) {
1731 for (i = 0; rsv_slots[i][0] != -1; i++) {
1732 off = rsv_slots[i][0];
1733 ln = rsv_slots[i][1];
1734 set_bits(off, ln,
1735 edma_cc[j]->edma_inuse);
1736 }
1737 }
1738 }
1739
1740 /* Clear the xbar mapped channels in unused list */
1741 xbar_chans = info[j]->xbar_chans;
1742 if (xbar_chans) {
1743 for (i = 0; xbar_chans[i][1] != -1; i++) {
1744 off = xbar_chans[i][1];
1745 clear_bits(off, 1,
1746 edma_cc[j]->edma_unused);
1747 }
1748 }
1749
1750 if (node) {
1751 irq[j] = irq_of_parse_and_map(node, 0);
1752 err_irq[j] = irq_of_parse_and_map(node, 2);
1753 } else {
1754 char irq_name[10];
1755
1756 sprintf(irq_name, "edma%d", j);
1757 irq[j] = platform_get_irq_byname(pdev, irq_name);
1758
1759 sprintf(irq_name, "edma%d_err", j);
1760 err_irq[j] = platform_get_irq_byname(pdev, irq_name);
1761 }
1762 edma_cc[j]->irq_res_start = irq[j];
1763 edma_cc[j]->irq_res_end = err_irq[j];
1764
1765 status = devm_request_irq(dev, irq[j], dma_irq_handler, 0,
1766 "edma", dev);
1767 if (status < 0) {
1768 dev_dbg(&pdev->dev,
1769 "devm_request_irq %d failed --> %d\n",
1770 irq[j], status);
1771 return status;
1772 }
1773
1774 status = devm_request_irq(dev, err_irq[j], dma_ccerr_handler, 0,
1775 "edma_error", dev);
1776 if (status < 0) {
1777 dev_dbg(&pdev->dev,
1778 "devm_request_irq %d failed --> %d\n",
1779 err_irq[j], status);
1780 return status;
1781 }
1782
1783 for (i = 0; i < edma_cc[j]->num_channels; i++)
1784 map_dmach_queue(j, i, info[j]->default_queue);
1785
1786 queue_priority_mapping = info[j]->queue_priority_mapping;
1787
1788 /* Event queue priority mapping */
1789 for (i = 0; queue_priority_mapping[i][0] != -1; i++)
1790 assign_priority_to_queue(j,
1791 queue_priority_mapping[i][0],
1792 queue_priority_mapping[i][1]);
1793
1794 /* Map the channel to param entry if channel mapping logic
1795 * exist
1796 */
1797 if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
1798 map_dmach_param(j);
1799
1800 for (i = 0; i < edma_cc[j]->num_region; i++) {
1801 edma_write_array2(j, EDMA_DRAE, i, 0, 0x0);
1802 edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
1803 edma_write_array(j, EDMA_QRAE, i, 0x0);
1804 }
1805 edma_cc[j]->info = info[j];
1806 arch_num_cc++;
1807
1808 edma_dev_info.id = j;
1809 platform_device_register_full(&edma_dev_info);
1810 }
1811
1812 return 0;
1813 }
1814
1815 #ifdef CONFIG_PM_SLEEP
1816 static int edma_pm_resume(struct device *dev)
1817 {
1818 int i, j;
1819
1820 for (j = 0; j < arch_num_cc; j++) {
1821 struct edma *cc = edma_cc[j];
1822
1823 s8 (*queue_priority_mapping)[2];
1824
1825 queue_priority_mapping = cc->info->queue_priority_mapping;
1826
1827 /* Event queue priority mapping */
1828 for (i = 0; queue_priority_mapping[i][0] != -1; i++)
1829 assign_priority_to_queue(j,
1830 queue_priority_mapping[i][0],
1831 queue_priority_mapping[i][1]);
1832
1833 /*
1834 * Map the channel to param entry if channel mapping logic
1835 * exist
1836 */
1837 if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
1838 map_dmach_param(j);
1839
1840 for (i = 0; i < cc->num_channels; i++) {
1841 if (test_bit(i, cc->edma_inuse)) {
1842 /* ensure access through shadow region 0 */
1843 edma_or_array2(j, EDMA_DRAE, 0, i >> 5,
1844 BIT(i & 0x1f));
1845
1846 setup_dma_interrupt(i,
1847 cc->intr_data[i].callback,
1848 cc->intr_data[i].data);
1849 }
1850 }
1851 }
1852
1853 return 0;
1854 }
1855 #endif
1856
1857 static const struct dev_pm_ops edma_pm_ops = {
1858 SET_LATE_SYSTEM_SLEEP_PM_OPS(NULL, edma_pm_resume)
1859 };
1860
1861 static struct platform_driver edma_driver = {
1862 .driver = {
1863 .name = "edma",
1864 .pm = &edma_pm_ops,
1865 .of_match_table = edma_of_ids,
1866 },
1867 .probe = edma_probe,
1868 };
1869
1870 static int __init edma_init(void)
1871 {
1872 return platform_driver_probe(&edma_driver, edma_probe);
1873 }
1874 arch_initcall(edma_init);
1875
Linux with added FPC-III support