1// SPDX-License-Identifier: GPL-2.0+
2//
3// Copyright (c) 2013-2014 Freescale Semiconductor, Inc
4// Copyright (c) 2017 Sysam, Angelo Dureghello <angelo@sysam.it>
5
6#include <linux/dmapool.h>
7#include <linux/module.h>
8#include <linux/slab.h>
9#include <linux/dma-mapping.h>
10
11#include "fsl-edma-common.h"
12
13#define EDMA_CR 0x00
14#define EDMA_ES 0x04
15#define EDMA_ERQ 0x0C
16#define EDMA_EEI 0x14
17#define EDMA_SERQ 0x1B
18#define EDMA_CERQ 0x1A
19#define EDMA_SEEI 0x19
20#define EDMA_CEEI 0x18
21#define EDMA_CINT 0x1F
22#define EDMA_CERR 0x1E
23#define EDMA_SSRT 0x1D
24#define EDMA_CDNE 0x1C
25#define EDMA_INTR 0x24
26#define EDMA_ERR 0x2C
27
28#define EDMA64_ERQH 0x08
29#define EDMA64_EEIH 0x10
30#define EDMA64_SERQ 0x18
31#define EDMA64_CERQ 0x19
32#define EDMA64_SEEI 0x1a
33#define EDMA64_CEEI 0x1b
34#define EDMA64_CINT 0x1c
35#define EDMA64_CERR 0x1d
36#define EDMA64_SSRT 0x1e
37#define EDMA64_CDNE 0x1f
38#define EDMA64_INTH 0x20
39#define EDMA64_INTL 0x24
40#define EDMA64_ERRH 0x28
41#define EDMA64_ERRL 0x2c
42
43#define EDMA_TCD 0x1000
44
45static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)
46{
47 struct edma_regs *regs = &fsl_chan->edma->regs;
48 u32 ch = fsl_chan->vchan.chan.chan_id;
49
50 if (fsl_chan->edma->version == v1) {
51 edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), regs->seei);
52 edma_writeb(fsl_chan->edma, ch, regs->serq);
53 } else {
54 /* ColdFire is big endian, and accesses natively
55 * big endian I/O peripherals
56 */
57 iowrite8(EDMA_SEEI_SEEI(ch), regs->seei);
58 iowrite8(ch, regs->serq);
59 }
60}
61
62void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)
63{
64 struct edma_regs *regs = &fsl_chan->edma->regs;
65 u32 ch = fsl_chan->vchan.chan.chan_id;
66
67 if (fsl_chan->edma->version == v1) {
68 edma_writeb(fsl_chan->edma, ch, regs->cerq);
69 edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), regs->ceei);
70 } else {
71 /* ColdFire is big endian, and accesses natively
72 * big endian I/O peripherals
73 */
74 iowrite8(ch, regs->cerq);
75 iowrite8(EDMA_CEEI_CEEI(ch), regs->ceei);
76 }
77}
78EXPORT_SYMBOL_GPL(fsl_edma_disable_request);
79
80void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
81 unsigned int slot, bool enable)
82{
83 u32 ch = fsl_chan->vchan.chan.chan_id;
84 void __iomem *muxaddr;
85 unsigned int chans_per_mux, ch_off;
86
87 chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;
88 ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;
89 muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];
90 slot = EDMAMUX_CHCFG_SOURCE(slot);
91
92 if (enable)
93 iowrite8(EDMAMUX_CHCFG_ENBL | slot, muxaddr + ch_off);
94 else
95 iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off);
96}
97EXPORT_SYMBOL_GPL(fsl_edma_chan_mux);
98
99static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)
100{
101 switch (addr_width) {
102 case 1:
103 return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;
104 case 2:
105 return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;
106 case 4:
107 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
108 case 8:
109 return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;
110 default:
111 return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;
112 }
113}
114
115void fsl_edma_free_desc(struct virt_dma_desc *vdesc)
116{
117 struct fsl_edma_desc *fsl_desc;
118 int i;
119
120 fsl_desc = to_fsl_edma_desc(vdesc);
121 for (i = 0; i < fsl_desc->n_tcds; i++)
122 dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,
123 fsl_desc->tcd[i].ptcd);
124 kfree(fsl_desc);
125}
126EXPORT_SYMBOL_GPL(fsl_edma_free_desc);
127
128int fsl_edma_terminate_all(struct dma_chan *chan)
129{
130 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
131 unsigned long flags;
132 LIST_HEAD(head);
133
134 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
135 fsl_edma_disable_request(fsl_chan);
136 fsl_chan->edesc = NULL;
137 fsl_chan->idle = true;
138 vchan_get_all_descriptors(&fsl_chan->vchan, &head);
139 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
140 vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
141 return 0;
142}
143EXPORT_SYMBOL_GPL(fsl_edma_terminate_all);
144
145int fsl_edma_pause(struct dma_chan *chan)
146{
147 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
148 unsigned long flags;
149
150 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
151 if (fsl_chan->edesc) {
152 fsl_edma_disable_request(fsl_chan);
153 fsl_chan->status = DMA_PAUSED;
154 fsl_chan->idle = true;
155 }
156 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
157 return 0;
158}
159EXPORT_SYMBOL_GPL(fsl_edma_pause);
160
161int fsl_edma_resume(struct dma_chan *chan)
162{
163 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
164 unsigned long flags;
165
166 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
167 if (fsl_chan->edesc) {
168 fsl_edma_enable_request(fsl_chan);
169 fsl_chan->status = DMA_IN_PROGRESS;
170 fsl_chan->idle = false;
171 }
172 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
173 return 0;
174}
175EXPORT_SYMBOL_GPL(fsl_edma_resume);
176
177static void fsl_edma_unprep_slave_dma(struct fsl_edma_chan *fsl_chan)
178{
179 if (fsl_chan->dma_dir != DMA_NONE)
180 dma_unmap_resource(fsl_chan->vchan.chan.device->dev,
181 fsl_chan->dma_dev_addr,
182 fsl_chan->dma_dev_size,
183 fsl_chan->dma_dir, 0);
184 fsl_chan->dma_dir = DMA_NONE;
185}
186
187static bool fsl_edma_prep_slave_dma(struct fsl_edma_chan *fsl_chan,
188 enum dma_transfer_direction dir)
189{
190 struct device *dev = fsl_chan->vchan.chan.device->dev;
191 enum dma_data_direction dma_dir;
192 phys_addr_t addr = 0;
193 u32 size = 0;
194
195 switch (dir) {
196 case DMA_MEM_TO_DEV:
197 dma_dir = DMA_FROM_DEVICE;
198 addr = fsl_chan->cfg.dst_addr;
199 size = fsl_chan->cfg.dst_maxburst;
200 break;
201 case DMA_DEV_TO_MEM:
202 dma_dir = DMA_TO_DEVICE;
203 addr = fsl_chan->cfg.src_addr;
204 size = fsl_chan->cfg.src_maxburst;
205 break;
206 default:
207 dma_dir = DMA_NONE;
208 break;
209 }
210
211 /* Already mapped for this config? */
212 if (fsl_chan->dma_dir == dma_dir)
213 return true;
214
215 fsl_edma_unprep_slave_dma(fsl_chan);
216
217 fsl_chan->dma_dev_addr = dma_map_resource(dev, addr, size, dma_dir, 0);
218 if (dma_mapping_error(dev, fsl_chan->dma_dev_addr))
219 return false;
220 fsl_chan->dma_dev_size = size;
221 fsl_chan->dma_dir = dma_dir;
222
223 return true;
224}
225
226int fsl_edma_slave_config(struct dma_chan *chan,
227 struct dma_slave_config *cfg)
228{
229 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
230
231 memcpy(&fsl_chan->cfg, cfg, sizeof(*cfg));
232 fsl_edma_unprep_slave_dma(fsl_chan);
233
234 return 0;
235}
236EXPORT_SYMBOL_GPL(fsl_edma_slave_config);
237
238static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
239 struct virt_dma_desc *vdesc, bool in_progress)
240{
241 struct fsl_edma_desc *edesc = fsl_chan->edesc;
242 struct edma_regs *regs = &fsl_chan->edma->regs;
243 u32 ch = fsl_chan->vchan.chan.chan_id;
244 enum dma_transfer_direction dir = edesc->dirn;
245 dma_addr_t cur_addr, dma_addr;
246 size_t len, size;
247 int i;
248
249 /* calculate the total size in this desc */
250 for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)
251 len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
252 * le16_to_cpu(edesc->tcd[i].vtcd->biter);
253
254 if (!in_progress)
255 return len;
256
257 if (dir == DMA_MEM_TO_DEV)
258 cur_addr = edma_readl(fsl_chan->edma, &regs->tcd[ch].saddr);
259 else
260 cur_addr = edma_readl(fsl_chan->edma, &regs->tcd[ch].daddr);
261
262 /* figure out the finished and calculate the residue */
263 for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
264 size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes)
265 * le16_to_cpu(edesc->tcd[i].vtcd->biter);
266 if (dir == DMA_MEM_TO_DEV)
267 dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);
268 else
269 dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);
270
271 len -= size;
272 if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {
273 len += dma_addr + size - cur_addr;
274 break;
275 }
276 }
277
278 return len;
279}
280
281enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
282 dma_cookie_t cookie, struct dma_tx_state *txstate)
283{
284 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
285 struct virt_dma_desc *vdesc;
286 enum dma_status status;
287 unsigned long flags;
288
289 status = dma_cookie_status(chan, cookie, txstate);
290 if (status == DMA_COMPLETE)
291 return status;
292
293 if (!txstate)
294 return fsl_chan->status;
295
296 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
297 vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);
298 if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)
299 txstate->residue =
300 fsl_edma_desc_residue(fsl_chan, vdesc, true);
301 else if (vdesc)
302 txstate->residue =
303 fsl_edma_desc_residue(fsl_chan, vdesc, false);
304 else
305 txstate->residue = 0;
306
307 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
308
309 return fsl_chan->status;
310}
311EXPORT_SYMBOL_GPL(fsl_edma_tx_status);
312
313static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
314 struct fsl_edma_hw_tcd *tcd)
315{
316 struct fsl_edma_engine *edma = fsl_chan->edma;
317 struct edma_regs *regs = &fsl_chan->edma->regs;
318 u32 ch = fsl_chan->vchan.chan.chan_id;
319
320 /*
321 * TCD parameters are stored in struct fsl_edma_hw_tcd in little
322 * endian format. However, we need to load the TCD registers in
323 * big- or little-endian obeying the eDMA engine model endian.
324 */
325 edma_writew(edma, 0, &regs->tcd[ch].csr);
326 edma_writel(edma, le32_to_cpu(tcd->saddr), &regs->tcd[ch].saddr);
327 edma_writel(edma, le32_to_cpu(tcd->daddr), &regs->tcd[ch].daddr);
328
329 edma_writew(edma, le16_to_cpu(tcd->attr), &regs->tcd[ch].attr);
330 edma_writew(edma, le16_to_cpu(tcd->soff), &regs->tcd[ch].soff);
331
332 edma_writel(edma, le32_to_cpu(tcd->nbytes), &regs->tcd[ch].nbytes);
333 edma_writel(edma, le32_to_cpu(tcd->slast), &regs->tcd[ch].slast);
334
335 edma_writew(edma, le16_to_cpu(tcd->citer), &regs->tcd[ch].citer);
336 edma_writew(edma, le16_to_cpu(tcd->biter), &regs->tcd[ch].biter);
337 edma_writew(edma, le16_to_cpu(tcd->doff), &regs->tcd[ch].doff);
338
339 edma_writel(edma, le32_to_cpu(tcd->dlast_sga),
340 &regs->tcd[ch].dlast_sga);
341
342 edma_writew(edma, le16_to_cpu(tcd->csr), &regs->tcd[ch].csr);
343}
344
345static inline
346void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,
347 u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,
348 u16 biter, u16 doff, u32 dlast_sga, bool major_int,
349 bool disable_req, bool enable_sg)
350{
351 u16 csr = 0;
352
353 /*
354 * eDMA hardware SGs require the TCDs to be stored in little
355 * endian format irrespective of the register endian model.
356 * So we put the value in little endian in memory, waiting
357 * for fsl_edma_set_tcd_regs doing the swap.
358 */
359 tcd->saddr = cpu_to_le32(src);
360 tcd->daddr = cpu_to_le32(dst);
361
362 tcd->attr = cpu_to_le16(attr);
363
364 tcd->soff = cpu_to_le16(soff);
365
366 tcd->nbytes = cpu_to_le32(nbytes);
367 tcd->slast = cpu_to_le32(slast);
368
369 tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));
370 tcd->doff = cpu_to_le16(doff);
371
372 tcd->dlast_sga = cpu_to_le32(dlast_sga);
373
374 tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));
375 if (major_int)
376 csr |= EDMA_TCD_CSR_INT_MAJOR;
377
378 if (disable_req)
379 csr |= EDMA_TCD_CSR_D_REQ;
380
381 if (enable_sg)
382 csr |= EDMA_TCD_CSR_E_SG;
383
384 tcd->csr = cpu_to_le16(csr);
385}
386
387static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,
388 int sg_len)
389{
390 struct fsl_edma_desc *fsl_desc;
391 int i;
392
393 fsl_desc = kzalloc(struct_size(fsl_desc, tcd, sg_len), GFP_NOWAIT);
394 if (!fsl_desc)
395 return NULL;
396
397 fsl_desc->echan = fsl_chan;
398 fsl_desc->n_tcds = sg_len;
399 for (i = 0; i < sg_len; i++) {
400 fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,
401 GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);
402 if (!fsl_desc->tcd[i].vtcd)
403 goto err;
404 }
405 return fsl_desc;
406
407err:
408 while (--i >= 0)
409 dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,
410 fsl_desc->tcd[i].ptcd);
411 kfree(fsl_desc);
412 return NULL;
413}
414
415struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
416 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
417 size_t period_len, enum dma_transfer_direction direction,
418 unsigned long flags)
419{
420 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
421 struct fsl_edma_desc *fsl_desc;
422 dma_addr_t dma_buf_next;
423 int sg_len, i;
424 u32 src_addr, dst_addr, last_sg, nbytes;
425 u16 soff, doff, iter;
426
427 if (!is_slave_direction(direction))
428 return NULL;
429
430 if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
431 return NULL;
432
433 sg_len = buf_len / period_len;
434 fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
435 if (!fsl_desc)
436 return NULL;
437 fsl_desc->iscyclic = true;
438 fsl_desc->dirn = direction;
439
440 dma_buf_next = dma_addr;
441 if (direction == DMA_MEM_TO_DEV) {
442 fsl_chan->attr =
443 fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
444 nbytes = fsl_chan->cfg.dst_addr_width *
445 fsl_chan->cfg.dst_maxburst;
446 } else {
447 fsl_chan->attr =
448 fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
449 nbytes = fsl_chan->cfg.src_addr_width *
450 fsl_chan->cfg.src_maxburst;
451 }
452
453 iter = period_len / nbytes;
454
455 for (i = 0; i < sg_len; i++) {
456 if (dma_buf_next >= dma_addr + buf_len)
457 dma_buf_next = dma_addr;
458
459 /* get next sg's physical address */
460 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
461
462 if (direction == DMA_MEM_TO_DEV) {
463 src_addr = dma_buf_next;
464 dst_addr = fsl_chan->dma_dev_addr;
465 soff = fsl_chan->cfg.dst_addr_width;
466 doff = 0;
467 } else {
468 src_addr = fsl_chan->dma_dev_addr;
469 dst_addr = dma_buf_next;
470 soff = 0;
471 doff = fsl_chan->cfg.src_addr_width;
472 }
473
474 fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr,
475 fsl_chan->attr, soff, nbytes, 0, iter,
476 iter, doff, last_sg, true, false, true);
477 dma_buf_next += period_len;
478 }
479
480 return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
481}
482EXPORT_SYMBOL_GPL(fsl_edma_prep_dma_cyclic);
483
484struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
485 struct dma_chan *chan, struct scatterlist *sgl,
486 unsigned int sg_len, enum dma_transfer_direction direction,
487 unsigned long flags, void *context)
488{
489 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
490 struct fsl_edma_desc *fsl_desc;
491 struct scatterlist *sg;
492 u32 src_addr, dst_addr, last_sg, nbytes;
493 u16 soff, doff, iter;
494 int i;
495
496 if (!is_slave_direction(direction))
497 return NULL;
498
499 if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
500 return NULL;
501
502 fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
503 if (!fsl_desc)
504 return NULL;
505 fsl_desc->iscyclic = false;
506 fsl_desc->dirn = direction;
507
508 if (direction == DMA_MEM_TO_DEV) {
509 fsl_chan->attr =
510 fsl_edma_get_tcd_attr(fsl_chan->cfg.dst_addr_width);
511 nbytes = fsl_chan->cfg.dst_addr_width *
512 fsl_chan->cfg.dst_maxburst;
513 } else {
514 fsl_chan->attr =
515 fsl_edma_get_tcd_attr(fsl_chan->cfg.src_addr_width);
516 nbytes = fsl_chan->cfg.src_addr_width *
517 fsl_chan->cfg.src_maxburst;
518 }
519
520 for_each_sg(sgl, sg, sg_len, i) {
521 /* get next sg's physical address */
522 last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;
523
524 if (direction == DMA_MEM_TO_DEV) {
525 src_addr = sg_dma_address(sg);
526 dst_addr = fsl_chan->dma_dev_addr;
527 soff = fsl_chan->cfg.dst_addr_width;
528 doff = 0;
529 } else {
530 src_addr = fsl_chan->dma_dev_addr;
531 dst_addr = sg_dma_address(sg);
532 soff = 0;
533 doff = fsl_chan->cfg.src_addr_width;
534 }
535
536 iter = sg_dma_len(sg) / nbytes;
537 if (i < sg_len - 1) {
538 last_sg = fsl_desc->tcd[(i + 1)].ptcd;
539 fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
540 dst_addr, fsl_chan->attr, soff,
541 nbytes, 0, iter, iter, doff, last_sg,
542 false, false, true);
543 } else {
544 last_sg = 0;
545 fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,
546 dst_addr, fsl_chan->attr, soff,
547 nbytes, 0, iter, iter, doff, last_sg,
548 true, true, false);
549 }
550 }
551
552 return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);
553}
554EXPORT_SYMBOL_GPL(fsl_edma_prep_slave_sg);
555
556void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)
557{
558 struct virt_dma_desc *vdesc;
559
560 vdesc = vchan_next_desc(&fsl_chan->vchan);
561 if (!vdesc)
562 return;
563 fsl_chan->edesc = to_fsl_edma_desc(vdesc);
564 fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
565 fsl_edma_enable_request(fsl_chan);
566 fsl_chan->status = DMA_IN_PROGRESS;
567 fsl_chan->idle = false;
568}
569EXPORT_SYMBOL_GPL(fsl_edma_xfer_desc);
570
571void fsl_edma_issue_pending(struct dma_chan *chan)
572{
573 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
574 unsigned long flags;
575
576 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
577
578 if (unlikely(fsl_chan->pm_state != RUNNING)) {
579 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
580 /* cannot submit due to suspend */
581 return;
582 }
583
584 if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
585 fsl_edma_xfer_desc(fsl_chan);
586
587 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
588}
589EXPORT_SYMBOL_GPL(fsl_edma_issue_pending);
590
591int fsl_edma_alloc_chan_resources(struct dma_chan *chan)
592{
593 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
594
595 fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,
596 sizeof(struct fsl_edma_hw_tcd),
597 32, 0);
598 return 0;
599}
600EXPORT_SYMBOL_GPL(fsl_edma_alloc_chan_resources);
601
602void fsl_edma_free_chan_resources(struct dma_chan *chan)
603{
604 struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
605 unsigned long flags;
606 LIST_HEAD(head);
607
608 spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
609 fsl_edma_disable_request(fsl_chan);
610 fsl_edma_chan_mux(fsl_chan, 0, false);
611 fsl_chan->edesc = NULL;
612 vchan_get_all_descriptors(&fsl_chan->vchan, &head);
613 fsl_edma_unprep_slave_dma(fsl_chan);
614 spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
615
616 vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
617 dma_pool_destroy(fsl_chan->tcd_pool);
618 fsl_chan->tcd_pool = NULL;
619}
620EXPORT_SYMBOL_GPL(fsl_edma_free_chan_resources);
621
622void fsl_edma_cleanup_vchan(struct dma_device *dmadev)
623{
624 struct fsl_edma_chan *chan, *_chan;
625
626 list_for_each_entry_safe(chan, _chan,
627 &dmadev->channels, vchan.chan.device_node) {
628 list_del(&chan->vchan.chan.device_node);
629 tasklet_kill(&chan->vchan.task);
630 }
631}
632EXPORT_SYMBOL_GPL(fsl_edma_cleanup_vchan);
633
634/*
635 * On the 32 channels Vybrid/mpc577x edma version (here called "v1"),
636 * register offsets are different compared to ColdFire mcf5441x 64 channels
637 * edma (here called "v2").
638 *
639 * This function sets up register offsets as per proper declared version
640 * so must be called in xxx_edma_probe() just after setting the
641 * edma "version" and "membase" appropriately.
642 */
643void fsl_edma_setup_regs(struct fsl_edma_engine *edma)
644{
645 edma->regs.cr = edma->membase + EDMA_CR;
646 edma->regs.es = edma->membase + EDMA_ES;
647 edma->regs.erql = edma->membase + EDMA_ERQ;
648 edma->regs.eeil = edma->membase + EDMA_EEI;
649
650 edma->regs.serq = edma->membase + ((edma->version == v1) ?
651 EDMA_SERQ : EDMA64_SERQ);
652 edma->regs.cerq = edma->membase + ((edma->version == v1) ?
653 EDMA_CERQ : EDMA64_CERQ);
654 edma->regs.seei = edma->membase + ((edma->version == v1) ?
655 EDMA_SEEI : EDMA64_SEEI);
656 edma->regs.ceei = edma->membase + ((edma->version == v1) ?
657 EDMA_CEEI : EDMA64_CEEI);
658 edma->regs.cint = edma->membase + ((edma->version == v1) ?
659 EDMA_CINT : EDMA64_CINT);
660 edma->regs.cerr = edma->membase + ((edma->version == v1) ?
661 EDMA_CERR : EDMA64_CERR);
662 edma->regs.ssrt = edma->membase + ((edma->version == v1) ?
663 EDMA_SSRT : EDMA64_SSRT);
664 edma->regs.cdne = edma->membase + ((edma->version == v1) ?
665 EDMA_CDNE : EDMA64_CDNE);
666 edma->regs.intl = edma->membase + ((edma->version == v1) ?
667 EDMA_INTR : EDMA64_INTL);
668 edma->regs.errl = edma->membase + ((edma->version == v1) ?
669 EDMA_ERR : EDMA64_ERRL);
670
671 if (edma->version == v2) {
672 edma->regs.erqh = edma->membase + EDMA64_ERQH;
673 edma->regs.eeih = edma->membase + EDMA64_EEIH;
674 edma->regs.errh = edma->membase + EDMA64_ERRH;
675 edma->regs.inth = edma->membase + EDMA64_INTH;
676 }
677
678 edma->regs.tcd = edma->membase + EDMA_TCD;
679}
680EXPORT_SYMBOL_GPL(fsl_edma_setup_regs);
681
682MODULE_LICENSE("GPL v2");
683