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16#include <linux/dmaengine.h>
17#include <linux/dma-mapping.h>
18#include <linux/err.h>
19#include <linux/init.h>
20#include <linux/interrupt.h>
21#include <linux/list.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25#include <linux/spinlock.h>
26
27#include <mach/edma.h>
28
29#include "dmaengine.h"
30#include "virt-dma.h"
31
32
33
34
35
36
37
38
39
40
41#ifdef CONFIG_ARCH_DAVINCI_DA8XX
42#define EDMA_CTLRS 2
43#define EDMA_CHANS 32
44#else
45#define EDMA_CTLRS 1
46#define EDMA_CHANS 64
47#endif
48
49
50#define MAX_NR_SG 16
51#define EDMA_MAX_SLOTS MAX_NR_SG
52#define EDMA_DESCRIPTORS 16
53
54struct edma_desc {
55 struct virt_dma_desc vdesc;
56 struct list_head node;
57 int absync;
58 int pset_nr;
59 struct edmacc_param pset[0];
60};
61
62struct edma_cc;
63
64struct edma_chan {
65 struct virt_dma_chan vchan;
66 struct list_head node;
67 struct edma_desc *edesc;
68 struct edma_cc *ecc;
69 int ch_num;
70 bool alloced;
71 int slot[EDMA_MAX_SLOTS];
72 struct dma_slave_config cfg;
73};
74
75struct edma_cc {
76 int ctlr;
77 struct dma_device dma_slave;
78 struct edma_chan slave_chans[EDMA_CHANS];
79 int num_slave_chans;
80 int dummy_slot;
81};
82
83static inline struct edma_cc *to_edma_cc(struct dma_device *d)
84{
85 return container_of(d, struct edma_cc, dma_slave);
86}
87
88static inline struct edma_chan *to_edma_chan(struct dma_chan *c)
89{
90 return container_of(c, struct edma_chan, vchan.chan);
91}
92
93static inline struct edma_desc
94*to_edma_desc(struct dma_async_tx_descriptor *tx)
95{
96 return container_of(tx, struct edma_desc, vdesc.tx);
97}
98
99static void edma_desc_free(struct virt_dma_desc *vdesc)
100{
101 kfree(container_of(vdesc, struct edma_desc, vdesc));
102}
103
104
105static void edma_execute(struct edma_chan *echan)
106{
107 struct virt_dma_desc *vdesc = vchan_next_desc(&echan->vchan);
108 struct edma_desc *edesc;
109 int i;
110
111 if (!vdesc) {
112 echan->edesc = NULL;
113 return;
114 }
115
116 list_del(&vdesc->node);
117
118 echan->edesc = edesc = to_edma_desc(&vdesc->tx);
119
120
121 for (i = 0; i < edesc->pset_nr; i++) {
122 edma_write_slot(echan->slot[i], &edesc->pset[i]);
123 dev_dbg(echan->vchan.chan.device->dev,
124 "\n pset[%d]:\n"
125 " chnum\t%d\n"
126 " slot\t%d\n"
127 " opt\t%08x\n"
128 " src\t%08x\n"
129 " dst\t%08x\n"
130 " abcnt\t%08x\n"
131 " ccnt\t%08x\n"
132 " bidx\t%08x\n"
133 " cidx\t%08x\n"
134 " lkrld\t%08x\n",
135 i, echan->ch_num, echan->slot[i],
136 edesc->pset[i].opt,
137 edesc->pset[i].src,
138 edesc->pset[i].dst,
139 edesc->pset[i].a_b_cnt,
140 edesc->pset[i].ccnt,
141 edesc->pset[i].src_dst_bidx,
142 edesc->pset[i].src_dst_cidx,
143 edesc->pset[i].link_bcntrld);
144
145 if (i != (edesc->pset_nr - 1))
146 edma_link(echan->slot[i], echan->slot[i+1]);
147
148 else
149 edma_link(echan->slot[i], echan->ecc->dummy_slot);
150 }
151
152 edma_start(echan->ch_num);
153}
154
155static int edma_terminate_all(struct edma_chan *echan)
156{
157 unsigned long flags;
158 LIST_HEAD(head);
159
160 spin_lock_irqsave(&echan->vchan.lock, flags);
161
162
163
164
165
166
167 if (echan->edesc) {
168 echan->edesc = NULL;
169 edma_stop(echan->ch_num);
170 }
171
172 vchan_get_all_descriptors(&echan->vchan, &head);
173 spin_unlock_irqrestore(&echan->vchan.lock, flags);
174 vchan_dma_desc_free_list(&echan->vchan, &head);
175
176 return 0;
177}
178
179static int edma_slave_config(struct edma_chan *echan,
180 struct dma_slave_config *cfg)
181{
182 if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
183 cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
184 return -EINVAL;
185
186 memcpy(&echan->cfg, cfg, sizeof(echan->cfg));
187
188 return 0;
189}
190
191static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
192 unsigned long arg)
193{
194 int ret = 0;
195 struct dma_slave_config *config;
196 struct edma_chan *echan = to_edma_chan(chan);
197
198 switch (cmd) {
199 case DMA_TERMINATE_ALL:
200 edma_terminate_all(echan);
201 break;
202 case DMA_SLAVE_CONFIG:
203 config = (struct dma_slave_config *)arg;
204 ret = edma_slave_config(echan, config);
205 break;
206 default:
207 ret = -ENOSYS;
208 }
209
210 return ret;
211}
212
213static struct dma_async_tx_descriptor *edma_prep_slave_sg(
214 struct dma_chan *chan, struct scatterlist *sgl,
215 unsigned int sg_len, enum dma_transfer_direction direction,
216 unsigned long tx_flags, void *context)
217{
218 struct edma_chan *echan = to_edma_chan(chan);
219 struct device *dev = chan->device->dev;
220 struct edma_desc *edesc;
221 dma_addr_t dev_addr;
222 enum dma_slave_buswidth dev_width;
223 u32 burst;
224 struct scatterlist *sg;
225 int i;
226 int acnt, bcnt, ccnt, src, dst, cidx;
227 int src_bidx, dst_bidx, src_cidx, dst_cidx;
228
229 if (unlikely(!echan || !sgl || !sg_len))
230 return NULL;
231
232 if (direction == DMA_DEV_TO_MEM) {
233 dev_addr = echan->cfg.src_addr;
234 dev_width = echan->cfg.src_addr_width;
235 burst = echan->cfg.src_maxburst;
236 } else if (direction == DMA_MEM_TO_DEV) {
237 dev_addr = echan->cfg.dst_addr;
238 dev_width = echan->cfg.dst_addr_width;
239 burst = echan->cfg.dst_maxburst;
240 } else {
241 dev_err(dev, "%s: bad direction?\n", __func__);
242 return NULL;
243 }
244
245 if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
246 dev_err(dev, "Undefined slave buswidth\n");
247 return NULL;
248 }
249
250 if (sg_len > MAX_NR_SG) {
251 dev_err(dev, "Exceeded max SG segments %d > %d\n",
252 sg_len, MAX_NR_SG);
253 return NULL;
254 }
255
256 edesc = kzalloc(sizeof(*edesc) + sg_len *
257 sizeof(edesc->pset[0]), GFP_ATOMIC);
258 if (!edesc) {
259 dev_dbg(dev, "Failed to allocate a descriptor\n");
260 return NULL;
261 }
262
263 edesc->pset_nr = sg_len;
264
265 for_each_sg(sgl, sg, sg_len, i) {
266
267 if (echan->slot[i] < 0) {
268 echan->slot[i] =
269 edma_alloc_slot(EDMA_CTLR(echan->ch_num),
270 EDMA_SLOT_ANY);
271 if (echan->slot[i] < 0) {
272 dev_err(dev, "Failed to allocate slot\n");
273 return NULL;
274 }
275 }
276
277 acnt = dev_width;
278
279
280
281
282
283
284 if (burst == 1) {
285 edesc->absync = false;
286 ccnt = sg_dma_len(sg) / acnt / (SZ_64K - 1);
287 bcnt = sg_dma_len(sg) / acnt - ccnt * (SZ_64K - 1);
288 if (bcnt)
289 ccnt++;
290 else
291 bcnt = SZ_64K - 1;
292 cidx = acnt;
293
294
295
296
297
298
299
300
301
302 } else {
303 edesc->absync = true;
304 bcnt = burst;
305 ccnt = sg_dma_len(sg) / (acnt * bcnt);
306 if (ccnt > (SZ_64K - 1)) {
307 dev_err(dev, "Exceeded max SG segment size\n");
308 return NULL;
309 }
310 cidx = acnt * bcnt;
311 }
312
313 if (direction == DMA_MEM_TO_DEV) {
314 src = sg_dma_address(sg);
315 dst = dev_addr;
316 src_bidx = acnt;
317 src_cidx = cidx;
318 dst_bidx = 0;
319 dst_cidx = 0;
320 } else {
321 src = dev_addr;
322 dst = sg_dma_address(sg);
323 src_bidx = 0;
324 src_cidx = 0;
325 dst_bidx = acnt;
326 dst_cidx = cidx;
327 }
328
329 edesc->pset[i].opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num));
330
331 if (edesc->absync)
332 edesc->pset[i].opt |= SYNCDIM;
333
334 if (i == sg_len - 1)
335 edesc->pset[i].opt |= TCINTEN;
336
337 edesc->pset[i].src = src;
338 edesc->pset[i].dst = dst;
339
340 edesc->pset[i].src_dst_bidx = (dst_bidx << 16) | src_bidx;
341 edesc->pset[i].src_dst_cidx = (dst_cidx << 16) | src_cidx;
342
343 edesc->pset[i].a_b_cnt = bcnt << 16 | acnt;
344 edesc->pset[i].ccnt = ccnt;
345 edesc->pset[i].link_bcntrld = 0xffffffff;
346
347 }
348
349 return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
350}
351
352static void edma_callback(unsigned ch_num, u16 ch_status, void *data)
353{
354 struct edma_chan *echan = data;
355 struct device *dev = echan->vchan.chan.device->dev;
356 struct edma_desc *edesc;
357 unsigned long flags;
358
359
360 edma_stop(echan->ch_num);
361
362 switch (ch_status) {
363 case DMA_COMPLETE:
364 dev_dbg(dev, "transfer complete on channel %d\n", ch_num);
365
366 spin_lock_irqsave(&echan->vchan.lock, flags);
367
368 edesc = echan->edesc;
369 if (edesc) {
370 edma_execute(echan);
371 vchan_cookie_complete(&edesc->vdesc);
372 }
373
374 spin_unlock_irqrestore(&echan->vchan.lock, flags);
375
376 break;
377 case DMA_CC_ERROR:
378 dev_dbg(dev, "transfer error on channel %d\n", ch_num);
379 break;
380 default:
381 break;
382 }
383}
384
385
386static int edma_alloc_chan_resources(struct dma_chan *chan)
387{
388 struct edma_chan *echan = to_edma_chan(chan);
389 struct device *dev = chan->device->dev;
390 int ret;
391 int a_ch_num;
392 LIST_HEAD(descs);
393
394 a_ch_num = edma_alloc_channel(echan->ch_num, edma_callback,
395 chan, EVENTQ_DEFAULT);
396
397 if (a_ch_num < 0) {
398 ret = -ENODEV;
399 goto err_no_chan;
400 }
401
402 if (a_ch_num != echan->ch_num) {
403 dev_err(dev, "failed to allocate requested channel %u:%u\n",
404 EDMA_CTLR(echan->ch_num),
405 EDMA_CHAN_SLOT(echan->ch_num));
406 ret = -ENODEV;
407 goto err_wrong_chan;
408 }
409
410 echan->alloced = true;
411 echan->slot[0] = echan->ch_num;
412
413 dev_info(dev, "allocated channel for %u:%u\n",
414 EDMA_CTLR(echan->ch_num), EDMA_CHAN_SLOT(echan->ch_num));
415
416 return 0;
417
418err_wrong_chan:
419 edma_free_channel(a_ch_num);
420err_no_chan:
421 return ret;
422}
423
424
425static void edma_free_chan_resources(struct dma_chan *chan)
426{
427 struct edma_chan *echan = to_edma_chan(chan);
428 struct device *dev = chan->device->dev;
429 int i;
430
431
432 edma_stop(echan->ch_num);
433
434 vchan_free_chan_resources(&echan->vchan);
435
436
437 for (i = 1; i < EDMA_MAX_SLOTS; i++) {
438 if (echan->slot[i] >= 0) {
439 edma_free_slot(echan->slot[i]);
440 echan->slot[i] = -1;
441 }
442 }
443
444
445 if (echan->alloced) {
446 edma_free_channel(echan->ch_num);
447 echan->alloced = false;
448 }
449
450 dev_info(dev, "freeing channel for %u\n", echan->ch_num);
451}
452
453
454static void edma_issue_pending(struct dma_chan *chan)
455{
456 struct edma_chan *echan = to_edma_chan(chan);
457 unsigned long flags;
458
459 spin_lock_irqsave(&echan->vchan.lock, flags);
460 if (vchan_issue_pending(&echan->vchan) && !echan->edesc)
461 edma_execute(echan);
462 spin_unlock_irqrestore(&echan->vchan.lock, flags);
463}
464
465static size_t edma_desc_size(struct edma_desc *edesc)
466{
467 int i;
468 size_t size;
469
470 if (edesc->absync)
471 for (size = i = 0; i < edesc->pset_nr; i++)
472 size += (edesc->pset[i].a_b_cnt & 0xffff) *
473 (edesc->pset[i].a_b_cnt >> 16) *
474 edesc->pset[i].ccnt;
475 else
476 size = (edesc->pset[0].a_b_cnt & 0xffff) *
477 (edesc->pset[0].a_b_cnt >> 16) +
478 (edesc->pset[0].a_b_cnt & 0xffff) *
479 (SZ_64K - 1) * edesc->pset[0].ccnt;
480
481 return size;
482}
483
484
485static enum dma_status edma_tx_status(struct dma_chan *chan,
486 dma_cookie_t cookie,
487 struct dma_tx_state *txstate)
488{
489 struct edma_chan *echan = to_edma_chan(chan);
490 struct virt_dma_desc *vdesc;
491 enum dma_status ret;
492 unsigned long flags;
493
494 ret = dma_cookie_status(chan, cookie, txstate);
495 if (ret == DMA_SUCCESS || !txstate)
496 return ret;
497
498 spin_lock_irqsave(&echan->vchan.lock, flags);
499 vdesc = vchan_find_desc(&echan->vchan, cookie);
500 if (vdesc) {
501 txstate->residue = edma_desc_size(to_edma_desc(&vdesc->tx));
502 } else if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie) {
503 struct edma_desc *edesc = echan->edesc;
504 txstate->residue = edma_desc_size(edesc);
505 } else {
506 txstate->residue = 0;
507 }
508 spin_unlock_irqrestore(&echan->vchan.lock, flags);
509
510 return ret;
511}
512
513static void __init edma_chan_init(struct edma_cc *ecc,
514 struct dma_device *dma,
515 struct edma_chan *echans)
516{
517 int i, j;
518
519 for (i = 0; i < EDMA_CHANS; i++) {
520 struct edma_chan *echan = &echans[i];
521 echan->ch_num = EDMA_CTLR_CHAN(ecc->ctlr, i);
522 echan->ecc = ecc;
523 echan->vchan.desc_free = edma_desc_free;
524
525 vchan_init(&echan->vchan, dma);
526
527 INIT_LIST_HEAD(&echan->node);
528 for (j = 0; j < EDMA_MAX_SLOTS; j++)
529 echan->slot[j] = -1;
530 }
531}
532
533static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
534 struct device *dev)
535{
536 dma->device_prep_slave_sg = edma_prep_slave_sg;
537 dma->device_alloc_chan_resources = edma_alloc_chan_resources;
538 dma->device_free_chan_resources = edma_free_chan_resources;
539 dma->device_issue_pending = edma_issue_pending;
540 dma->device_tx_status = edma_tx_status;
541 dma->device_control = edma_control;
542 dma->dev = dev;
543
544 INIT_LIST_HEAD(&dma->channels);
545}
546
547static int edma_probe(struct platform_device *pdev)
548{
549 struct edma_cc *ecc;
550 int ret;
551
552 ecc = devm_kzalloc(&pdev->dev, sizeof(*ecc), GFP_KERNEL);
553 if (!ecc) {
554 dev_err(&pdev->dev, "Can't allocate controller\n");
555 return -ENOMEM;
556 }
557
558 ecc->ctlr = pdev->id;
559 ecc->dummy_slot = edma_alloc_slot(ecc->ctlr, EDMA_SLOT_ANY);
560 if (ecc->dummy_slot < 0) {
561 dev_err(&pdev->dev, "Can't allocate PaRAM dummy slot\n");
562 return -EIO;
563 }
564
565 dma_cap_zero(ecc->dma_slave.cap_mask);
566 dma_cap_set(DMA_SLAVE, ecc->dma_slave.cap_mask);
567
568 edma_dma_init(ecc, &ecc->dma_slave, &pdev->dev);
569
570 edma_chan_init(ecc, &ecc->dma_slave, ecc->slave_chans);
571
572 ret = dma_async_device_register(&ecc->dma_slave);
573 if (ret)
574 goto err_reg1;
575
576 platform_set_drvdata(pdev, ecc);
577
578 dev_info(&pdev->dev, "TI EDMA DMA engine driver\n");
579
580 return 0;
581
582err_reg1:
583 edma_free_slot(ecc->dummy_slot);
584 return ret;
585}
586
587static int edma_remove(struct platform_device *pdev)
588{
589 struct device *dev = &pdev->dev;
590 struct edma_cc *ecc = dev_get_drvdata(dev);
591
592 dma_async_device_unregister(&ecc->dma_slave);
593 edma_free_slot(ecc->dummy_slot);
594
595 return 0;
596}
597
598static struct platform_driver edma_driver = {
599 .probe = edma_probe,
600 .remove = edma_remove,
601 .driver = {
602 .name = "edma-dma-engine",
603 .owner = THIS_MODULE,
604 },
605};
606
607bool edma_filter_fn(struct dma_chan *chan, void *param)
608{
609 if (chan->device->dev->driver == &edma_driver.driver) {
610 struct edma_chan *echan = to_edma_chan(chan);
611 unsigned ch_req = *(unsigned *)param;
612 return ch_req == echan->ch_num;
613 }
614 return false;
615}
616EXPORT_SYMBOL(edma_filter_fn);
617
618static struct platform_device *pdev0, *pdev1;
619
620static const struct platform_device_info edma_dev_info0 = {
621 .name = "edma-dma-engine",
622 .id = 0,
623};
624
625static const struct platform_device_info edma_dev_info1 = {
626 .name = "edma-dma-engine",
627 .id = 1,
628};
629
630static int edma_init(void)
631{
632 int ret = platform_driver_register(&edma_driver);
633
634 if (ret == 0) {
635 pdev0 = platform_device_register_full(&edma_dev_info0);
636 if (IS_ERR(pdev0)) {
637 platform_driver_unregister(&edma_driver);
638 ret = PTR_ERR(pdev0);
639 goto out;
640 }
641 pdev0->dev.dma_mask = &pdev0->dev.coherent_dma_mask;
642 pdev0->dev.coherent_dma_mask = DMA_BIT_MASK(32);
643 }
644
645 if (EDMA_CTLRS == 2) {
646 pdev1 = platform_device_register_full(&edma_dev_info1);
647 if (IS_ERR(pdev1)) {
648 platform_driver_unregister(&edma_driver);
649 platform_device_unregister(pdev0);
650 ret = PTR_ERR(pdev1);
651 }
652 pdev1->dev.dma_mask = &pdev1->dev.coherent_dma_mask;
653 pdev1->dev.coherent_dma_mask = DMA_BIT_MASK(32);
654 }
655
656out:
657 return ret;
658}
659subsys_initcall(edma_init);
660
661static void __exit edma_exit(void)
662{
663 platform_device_unregister(pdev0);
664 if (pdev1)
665 platform_device_unregister(pdev1);
666 platform_driver_unregister(&edma_driver);
667}
668module_exit(edma_exit);
669
670MODULE_AUTHOR("Matt Porter <mporter@ti.com>");
671MODULE_DESCRIPTION("TI EDMA DMA engine driver");
672MODULE_LICENSE("GPL v2");
673
