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c2dde5f8 MP |
1 | /* |
2 | * TI EDMA DMA engine driver | |
3 | * | |
4 | * Copyright 2012 Texas Instruments | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation version 2. | |
9 | * | |
10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
11 | * kind, whether express or implied; without even the implied warranty | |
12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/dmaengine.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/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 | * This will go away when the private EDMA API is folded | |
34 | * into this driver and the platform device(s) are | |
35 | * instantiated in the arch code. We can only get away | |
36 | * with this simplification because DA8XX may not be built | |
37 | * in the same kernel image with other DaVinci parts. This | |
38 | * avoids having to sprinkle dmaengine driver platform devices | |
39 | * and data throughout all the existing board files. | |
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 /* CONFIG_ARCH_DAVINCI_DA8XX */ | |
48 | ||
49 | /* Max of 16 segments per channel to conserve PaRAM slots */ | |
50 | #define MAX_NR_SG 16 | |
51 | #define EDMA_MAX_SLOTS MAX_NR_SG | |
52 | #define EDMA_DESCRIPTORS 16 | |
53 | ||
54 | struct 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 | ||
62 | struct edma_cc; | |
63 | ||
64 | struct 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 | dma_addr_t addr; | |
73 | int addr_width; | |
74 | int maxburst; | |
75 | }; | |
76 | ||
77 | struct edma_cc { | |
78 | int ctlr; | |
79 | struct dma_device dma_slave; | |
80 | struct edma_chan slave_chans[EDMA_CHANS]; | |
81 | int num_slave_chans; | |
82 | int dummy_slot; | |
83 | }; | |
84 | ||
85 | static inline struct edma_cc *to_edma_cc(struct dma_device *d) | |
86 | { | |
87 | return container_of(d, struct edma_cc, dma_slave); | |
88 | } | |
89 | ||
90 | static inline struct edma_chan *to_edma_chan(struct dma_chan *c) | |
91 | { | |
92 | return container_of(c, struct edma_chan, vchan.chan); | |
93 | } | |
94 | ||
95 | static inline struct edma_desc | |
96 | *to_edma_desc(struct dma_async_tx_descriptor *tx) | |
97 | { | |
98 | return container_of(tx, struct edma_desc, vdesc.tx); | |
99 | } | |
100 | ||
101 | static void edma_desc_free(struct virt_dma_desc *vdesc) | |
102 | { | |
103 | kfree(container_of(vdesc, struct edma_desc, vdesc)); | |
104 | } | |
105 | ||
106 | /* Dispatch a queued descriptor to the controller (caller holds lock) */ | |
107 | static void edma_execute(struct edma_chan *echan) | |
108 | { | |
109 | struct virt_dma_desc *vdesc = vchan_next_desc(&echan->vchan); | |
110 | struct edma_desc *edesc; | |
111 | int i; | |
112 | ||
113 | if (!vdesc) { | |
114 | echan->edesc = NULL; | |
115 | return; | |
116 | } | |
117 | ||
118 | list_del(&vdesc->node); | |
119 | ||
120 | echan->edesc = edesc = to_edma_desc(&vdesc->tx); | |
121 | ||
122 | /* Write descriptor PaRAM set(s) */ | |
123 | for (i = 0; i < edesc->pset_nr; i++) { | |
124 | edma_write_slot(echan->slot[i], &edesc->pset[i]); | |
125 | dev_dbg(echan->vchan.chan.device->dev, | |
126 | "\n pset[%d]:\n" | |
127 | " chnum\t%d\n" | |
128 | " slot\t%d\n" | |
129 | " opt\t%08x\n" | |
130 | " src\t%08x\n" | |
131 | " dst\t%08x\n" | |
132 | " abcnt\t%08x\n" | |
133 | " ccnt\t%08x\n" | |
134 | " bidx\t%08x\n" | |
135 | " cidx\t%08x\n" | |
136 | " lkrld\t%08x\n", | |
137 | i, echan->ch_num, echan->slot[i], | |
138 | edesc->pset[i].opt, | |
139 | edesc->pset[i].src, | |
140 | edesc->pset[i].dst, | |
141 | edesc->pset[i].a_b_cnt, | |
142 | edesc->pset[i].ccnt, | |
143 | edesc->pset[i].src_dst_bidx, | |
144 | edesc->pset[i].src_dst_cidx, | |
145 | edesc->pset[i].link_bcntrld); | |
146 | /* Link to the previous slot if not the last set */ | |
147 | if (i != (edesc->pset_nr - 1)) | |
148 | edma_link(echan->slot[i], echan->slot[i+1]); | |
149 | /* Final pset links to the dummy pset */ | |
150 | else | |
151 | edma_link(echan->slot[i], echan->ecc->dummy_slot); | |
152 | } | |
153 | ||
154 | edma_start(echan->ch_num); | |
155 | } | |
156 | ||
157 | static int edma_terminate_all(struct edma_chan *echan) | |
158 | { | |
159 | unsigned long flags; | |
160 | LIST_HEAD(head); | |
161 | ||
162 | spin_lock_irqsave(&echan->vchan.lock, flags); | |
163 | ||
164 | /* | |
165 | * Stop DMA activity: we assume the callback will not be called | |
166 | * after edma_dma() returns (even if it does, it will see | |
167 | * echan->edesc is NULL and exit.) | |
168 | */ | |
169 | if (echan->edesc) { | |
170 | echan->edesc = NULL; | |
171 | edma_stop(echan->ch_num); | |
172 | } | |
173 | ||
174 | vchan_get_all_descriptors(&echan->vchan, &head); | |
175 | spin_unlock_irqrestore(&echan->vchan.lock, flags); | |
176 | vchan_dma_desc_free_list(&echan->vchan, &head); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | ||
182 | static int edma_slave_config(struct edma_chan *echan, | |
183 | struct dma_slave_config *config) | |
184 | { | |
185 | if ((config->src_addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES) || | |
186 | (config->dst_addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES)) | |
187 | return -EINVAL; | |
188 | ||
189 | if (config->direction == DMA_MEM_TO_DEV) { | |
190 | if (config->dst_addr) | |
191 | echan->addr = config->dst_addr; | |
192 | if (config->dst_addr_width) | |
193 | echan->addr_width = config->dst_addr_width; | |
194 | if (config->dst_maxburst) | |
195 | echan->maxburst = config->dst_maxburst; | |
196 | } else if (config->direction == DMA_DEV_TO_MEM) { | |
197 | if (config->src_addr) | |
198 | echan->addr = config->src_addr; | |
199 | if (config->src_addr_width) | |
200 | echan->addr_width = config->src_addr_width; | |
201 | if (config->src_maxburst) | |
202 | echan->maxburst = config->src_maxburst; | |
203 | } | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, | |
209 | unsigned long arg) | |
210 | { | |
211 | int ret = 0; | |
212 | struct dma_slave_config *config; | |
213 | struct edma_chan *echan = to_edma_chan(chan); | |
214 | ||
215 | switch (cmd) { | |
216 | case DMA_TERMINATE_ALL: | |
217 | edma_terminate_all(echan); | |
218 | break; | |
219 | case DMA_SLAVE_CONFIG: | |
220 | config = (struct dma_slave_config *)arg; | |
221 | ret = edma_slave_config(echan, config); | |
222 | break; | |
223 | default: | |
224 | ret = -ENOSYS; | |
225 | } | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | static struct dma_async_tx_descriptor *edma_prep_slave_sg( | |
231 | struct dma_chan *chan, struct scatterlist *sgl, | |
232 | unsigned int sg_len, enum dma_transfer_direction direction, | |
233 | unsigned long tx_flags, void *context) | |
234 | { | |
235 | struct edma_chan *echan = to_edma_chan(chan); | |
236 | struct device *dev = chan->device->dev; | |
237 | struct edma_desc *edesc; | |
238 | struct scatterlist *sg; | |
239 | int i; | |
240 | int acnt, bcnt, ccnt, src, dst, cidx; | |
241 | int src_bidx, dst_bidx, src_cidx, dst_cidx; | |
242 | ||
243 | if (unlikely(!echan || !sgl || !sg_len)) | |
244 | return NULL; | |
245 | ||
246 | if (echan->addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) { | |
247 | dev_err(dev, "Undefined slave buswidth\n"); | |
248 | return NULL; | |
249 | } | |
250 | ||
251 | if (sg_len > MAX_NR_SG) { | |
252 | dev_err(dev, "Exceeded max SG segments %d > %d\n", | |
253 | sg_len, MAX_NR_SG); | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | edesc = kzalloc(sizeof(*edesc) + sg_len * | |
258 | sizeof(edesc->pset[0]), GFP_ATOMIC); | |
259 | if (!edesc) { | |
260 | dev_dbg(dev, "Failed to allocate a descriptor\n"); | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | edesc->pset_nr = sg_len; | |
265 | ||
266 | for_each_sg(sgl, sg, sg_len, i) { | |
267 | /* Allocate a PaRAM slot, if needed */ | |
268 | if (echan->slot[i] < 0) { | |
269 | echan->slot[i] = | |
270 | edma_alloc_slot(EDMA_CTLR(echan->ch_num), | |
271 | EDMA_SLOT_ANY); | |
272 | if (echan->slot[i] < 0) { | |
273 | dev_err(dev, "Failed to allocate slot\n"); | |
274 | return NULL; | |
275 | } | |
276 | } | |
277 | ||
278 | acnt = echan->addr_width; | |
279 | ||
280 | /* | |
281 | * If the maxburst is equal to the fifo width, use | |
282 | * A-synced transfers. This allows for large contiguous | |
283 | * buffer transfers using only one PaRAM set. | |
284 | */ | |
285 | if (echan->maxburst == 1) { | |
286 | edesc->absync = false; | |
287 | ccnt = sg_dma_len(sg) / acnt / (SZ_64K - 1); | |
288 | bcnt = sg_dma_len(sg) / acnt - ccnt * (SZ_64K - 1); | |
289 | if (bcnt) | |
290 | ccnt++; | |
291 | else | |
292 | bcnt = SZ_64K - 1; | |
293 | cidx = acnt; | |
294 | /* | |
295 | * If maxburst is greater than the fifo address_width, | |
296 | * use AB-synced transfers where A count is the fifo | |
297 | * address_width and B count is the maxburst. In this | |
298 | * case, we are limited to transfers of C count frames | |
299 | * of (address_width * maxburst) where C count is limited | |
300 | * to SZ_64K-1. This places an upper bound on the length | |
301 | * of an SG segment that can be handled. | |
302 | */ | |
303 | } else { | |
304 | edesc->absync = true; | |
305 | bcnt = echan->maxburst; | |
306 | ccnt = sg_dma_len(sg) / (acnt * bcnt); | |
307 | if (ccnt > (SZ_64K - 1)) { | |
308 | dev_err(dev, "Exceeded max SG segment size\n"); | |
309 | return NULL; | |
310 | } | |
311 | cidx = acnt * bcnt; | |
312 | } | |
313 | ||
314 | if (direction == DMA_MEM_TO_DEV) { | |
315 | src = sg_dma_address(sg); | |
316 | dst = echan->addr; | |
317 | src_bidx = acnt; | |
318 | src_cidx = cidx; | |
319 | dst_bidx = 0; | |
320 | dst_cidx = 0; | |
321 | } else { | |
322 | src = echan->addr; | |
323 | dst = sg_dma_address(sg); | |
324 | src_bidx = 0; | |
325 | src_cidx = 0; | |
326 | dst_bidx = acnt; | |
327 | dst_cidx = cidx; | |
328 | } | |
329 | ||
330 | edesc->pset[i].opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num)); | |
331 | /* Configure A or AB synchronized transfers */ | |
332 | if (edesc->absync) | |
333 | edesc->pset[i].opt |= SYNCDIM; | |
334 | /* If this is the last set, enable completion interrupt flag */ | |
335 | if (i == sg_len - 1) | |
336 | edesc->pset[i].opt |= TCINTEN; | |
337 | ||
338 | edesc->pset[i].src = src; | |
339 | edesc->pset[i].dst = dst; | |
340 | ||
341 | edesc->pset[i].src_dst_bidx = (dst_bidx << 16) | src_bidx; | |
342 | edesc->pset[i].src_dst_cidx = (dst_cidx << 16) | src_cidx; | |
343 | ||
344 | edesc->pset[i].a_b_cnt = bcnt << 16 | acnt; | |
345 | edesc->pset[i].ccnt = ccnt; | |
346 | edesc->pset[i].link_bcntrld = 0xffffffff; | |
347 | ||
348 | } | |
349 | ||
350 | return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); | |
351 | } | |
352 | ||
353 | static void edma_callback(unsigned ch_num, u16 ch_status, void *data) | |
354 | { | |
355 | struct edma_chan *echan = data; | |
356 | struct device *dev = echan->vchan.chan.device->dev; | |
357 | struct edma_desc *edesc; | |
358 | unsigned long flags; | |
359 | ||
360 | /* Stop the channel */ | |
361 | edma_stop(echan->ch_num); | |
362 | ||
363 | switch (ch_status) { | |
364 | case DMA_COMPLETE: | |
365 | dev_dbg(dev, "transfer complete on channel %d\n", ch_num); | |
366 | ||
367 | spin_lock_irqsave(&echan->vchan.lock, flags); | |
368 | ||
369 | edesc = echan->edesc; | |
370 | if (edesc) { | |
371 | edma_execute(echan); | |
372 | vchan_cookie_complete(&edesc->vdesc); | |
373 | } | |
374 | ||
375 | spin_unlock_irqrestore(&echan->vchan.lock, flags); | |
376 | ||
377 | break; | |
378 | case DMA_CC_ERROR: | |
379 | dev_dbg(dev, "transfer error on channel %d\n", ch_num); | |
380 | break; | |
381 | default: | |
382 | break; | |
383 | } | |
384 | } | |
385 | ||
386 | /* Alloc channel resources */ | |
387 | static int edma_alloc_chan_resources(struct dma_chan *chan) | |
388 | { | |
389 | struct edma_chan *echan = to_edma_chan(chan); | |
390 | struct device *dev = chan->device->dev; | |
391 | int ret; | |
392 | int a_ch_num; | |
393 | LIST_HEAD(descs); | |
394 | ||
395 | a_ch_num = edma_alloc_channel(echan->ch_num, edma_callback, | |
396 | chan, EVENTQ_DEFAULT); | |
397 | ||
398 | if (a_ch_num < 0) { | |
399 | ret = -ENODEV; | |
400 | goto err_no_chan; | |
401 | } | |
402 | ||
403 | if (a_ch_num != echan->ch_num) { | |
404 | dev_err(dev, "failed to allocate requested channel %u:%u\n", | |
405 | EDMA_CTLR(echan->ch_num), | |
406 | EDMA_CHAN_SLOT(echan->ch_num)); | |
407 | ret = -ENODEV; | |
408 | goto err_wrong_chan; | |
409 | } | |
410 | ||
411 | echan->alloced = true; | |
412 | echan->slot[0] = echan->ch_num; | |
413 | ||
414 | dev_info(dev, "allocated channel for %u:%u\n", | |
415 | EDMA_CTLR(echan->ch_num), EDMA_CHAN_SLOT(echan->ch_num)); | |
416 | ||
417 | return 0; | |
418 | ||
419 | err_wrong_chan: | |
420 | edma_free_channel(a_ch_num); | |
421 | err_no_chan: | |
422 | return ret; | |
423 | } | |
424 | ||
425 | /* Free channel resources */ | |
426 | static void edma_free_chan_resources(struct dma_chan *chan) | |
427 | { | |
428 | struct edma_chan *echan = to_edma_chan(chan); | |
429 | struct device *dev = chan->device->dev; | |
430 | int i; | |
431 | ||
432 | /* Terminate transfers */ | |
433 | edma_stop(echan->ch_num); | |
434 | ||
435 | vchan_free_chan_resources(&echan->vchan); | |
436 | ||
437 | /* Free EDMA PaRAM slots */ | |
438 | for (i = 1; i < EDMA_MAX_SLOTS; i++) { | |
439 | if (echan->slot[i] >= 0) { | |
440 | edma_free_slot(echan->slot[i]); | |
441 | echan->slot[i] = -1; | |
442 | } | |
443 | } | |
444 | ||
445 | /* Free EDMA channel */ | |
446 | if (echan->alloced) { | |
447 | edma_free_channel(echan->ch_num); | |
448 | echan->alloced = false; | |
449 | } | |
450 | ||
451 | dev_info(dev, "freeing channel for %u\n", echan->ch_num); | |
452 | } | |
453 | ||
454 | /* Send pending descriptor to hardware */ | |
455 | static void edma_issue_pending(struct dma_chan *chan) | |
456 | { | |
457 | struct edma_chan *echan = to_edma_chan(chan); | |
458 | unsigned long flags; | |
459 | ||
460 | spin_lock_irqsave(&echan->vchan.lock, flags); | |
461 | if (vchan_issue_pending(&echan->vchan) && !echan->edesc) | |
462 | edma_execute(echan); | |
463 | spin_unlock_irqrestore(&echan->vchan.lock, flags); | |
464 | } | |
465 | ||
466 | static size_t edma_desc_size(struct edma_desc *edesc) | |
467 | { | |
468 | int i; | |
469 | size_t size; | |
470 | ||
471 | if (edesc->absync) | |
472 | for (size = i = 0; i < edesc->pset_nr; i++) | |
473 | size += (edesc->pset[i].a_b_cnt & 0xffff) * | |
474 | (edesc->pset[i].a_b_cnt >> 16) * | |
475 | edesc->pset[i].ccnt; | |
476 | else | |
477 | size = (edesc->pset[0].a_b_cnt & 0xffff) * | |
478 | (edesc->pset[0].a_b_cnt >> 16) + | |
479 | (edesc->pset[0].a_b_cnt & 0xffff) * | |
480 | (SZ_64K - 1) * edesc->pset[0].ccnt; | |
481 | ||
482 | return size; | |
483 | } | |
484 | ||
485 | /* Check request completion status */ | |
486 | static enum dma_status edma_tx_status(struct dma_chan *chan, | |
487 | dma_cookie_t cookie, | |
488 | struct dma_tx_state *txstate) | |
489 | { | |
490 | struct edma_chan *echan = to_edma_chan(chan); | |
491 | struct virt_dma_desc *vdesc; | |
492 | enum dma_status ret; | |
493 | unsigned long flags; | |
494 | ||
495 | ret = dma_cookie_status(chan, cookie, txstate); | |
496 | if (ret == DMA_SUCCESS || !txstate) | |
497 | return ret; | |
498 | ||
499 | spin_lock_irqsave(&echan->vchan.lock, flags); | |
500 | vdesc = vchan_find_desc(&echan->vchan, cookie); | |
501 | if (vdesc) { | |
502 | txstate->residue = edma_desc_size(to_edma_desc(&vdesc->tx)); | |
503 | } else if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie) { | |
504 | struct edma_desc *edesc = echan->edesc; | |
505 | txstate->residue = edma_desc_size(edesc); | |
506 | } else { | |
507 | txstate->residue = 0; | |
508 | } | |
509 | spin_unlock_irqrestore(&echan->vchan.lock, flags); | |
510 | ||
511 | return ret; | |
512 | } | |
513 | ||
514 | static void __init edma_chan_init(struct edma_cc *ecc, | |
515 | struct dma_device *dma, | |
516 | struct edma_chan *echans) | |
517 | { | |
518 | int i, j; | |
519 | ||
520 | for (i = 0; i < EDMA_CHANS; i++) { | |
521 | struct edma_chan *echan = &echans[i]; | |
522 | echan->ch_num = EDMA_CTLR_CHAN(ecc->ctlr, i); | |
523 | echan->ecc = ecc; | |
524 | echan->vchan.desc_free = edma_desc_free; | |
525 | ||
526 | vchan_init(&echan->vchan, dma); | |
527 | ||
528 | INIT_LIST_HEAD(&echan->node); | |
529 | for (j = 0; j < EDMA_MAX_SLOTS; j++) | |
530 | echan->slot[j] = -1; | |
531 | } | |
532 | } | |
533 | ||
534 | static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma, | |
535 | struct device *dev) | |
536 | { | |
537 | dma->device_prep_slave_sg = edma_prep_slave_sg; | |
538 | dma->device_alloc_chan_resources = edma_alloc_chan_resources; | |
539 | dma->device_free_chan_resources = edma_free_chan_resources; | |
540 | dma->device_issue_pending = edma_issue_pending; | |
541 | dma->device_tx_status = edma_tx_status; | |
542 | dma->device_control = edma_control; | |
543 | dma->dev = dev; | |
544 | ||
545 | INIT_LIST_HEAD(&dma->channels); | |
546 | } | |
547 | ||
463a1f8b | 548 | static int edma_probe(struct platform_device *pdev) |
c2dde5f8 MP |
549 | { |
550 | struct edma_cc *ecc; | |
551 | int ret; | |
552 | ||
553 | ecc = devm_kzalloc(&pdev->dev, sizeof(*ecc), GFP_KERNEL); | |
554 | if (!ecc) { | |
555 | dev_err(&pdev->dev, "Can't allocate controller\n"); | |
556 | return -ENOMEM; | |
557 | } | |
558 | ||
559 | ecc->ctlr = pdev->id; | |
560 | ecc->dummy_slot = edma_alloc_slot(ecc->ctlr, EDMA_SLOT_ANY); | |
561 | if (ecc->dummy_slot < 0) { | |
562 | dev_err(&pdev->dev, "Can't allocate PaRAM dummy slot\n"); | |
563 | return -EIO; | |
564 | } | |
565 | ||
566 | dma_cap_zero(ecc->dma_slave.cap_mask); | |
567 | dma_cap_set(DMA_SLAVE, ecc->dma_slave.cap_mask); | |
568 | ||
569 | edma_dma_init(ecc, &ecc->dma_slave, &pdev->dev); | |
570 | ||
571 | edma_chan_init(ecc, &ecc->dma_slave, ecc->slave_chans); | |
572 | ||
573 | ret = dma_async_device_register(&ecc->dma_slave); | |
574 | if (ret) | |
575 | goto err_reg1; | |
576 | ||
577 | platform_set_drvdata(pdev, ecc); | |
578 | ||
579 | dev_info(&pdev->dev, "TI EDMA DMA engine driver\n"); | |
580 | ||
581 | return 0; | |
582 | ||
583 | err_reg1: | |
584 | edma_free_slot(ecc->dummy_slot); | |
585 | return ret; | |
586 | } | |
587 | ||
588 | static int __devexit edma_remove(struct platform_device *pdev) | |
589 | { | |
590 | struct device *dev = &pdev->dev; | |
591 | struct edma_cc *ecc = dev_get_drvdata(dev); | |
592 | ||
593 | dma_async_device_unregister(&ecc->dma_slave); | |
594 | edma_free_slot(ecc->dummy_slot); | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | static struct platform_driver edma_driver = { | |
600 | .probe = edma_probe, | |
a7d6e3ec | 601 | .remove = edma_remove, |
c2dde5f8 MP |
602 | .driver = { |
603 | .name = "edma-dma-engine", | |
604 | .owner = THIS_MODULE, | |
605 | }, | |
606 | }; | |
607 | ||
608 | bool edma_filter_fn(struct dma_chan *chan, void *param) | |
609 | { | |
610 | if (chan->device->dev->driver == &edma_driver.driver) { | |
611 | struct edma_chan *echan = to_edma_chan(chan); | |
612 | unsigned ch_req = *(unsigned *)param; | |
613 | return ch_req == echan->ch_num; | |
614 | } | |
615 | return false; | |
616 | } | |
617 | EXPORT_SYMBOL(edma_filter_fn); | |
618 | ||
619 | static struct platform_device *pdev0, *pdev1; | |
620 | ||
621 | static const struct platform_device_info edma_dev_info0 = { | |
622 | .name = "edma-dma-engine", | |
623 | .id = 0, | |
624 | .dma_mask = DMA_BIT_MASK(32), | |
625 | }; | |
626 | ||
627 | static const struct platform_device_info edma_dev_info1 = { | |
628 | .name = "edma-dma-engine", | |
629 | .id = 1, | |
630 | .dma_mask = DMA_BIT_MASK(32), | |
631 | }; | |
632 | ||
633 | static int edma_init(void) | |
634 | { | |
635 | int ret = platform_driver_register(&edma_driver); | |
636 | ||
637 | if (ret == 0) { | |
638 | pdev0 = platform_device_register_full(&edma_dev_info0); | |
639 | if (IS_ERR(pdev0)) { | |
640 | platform_driver_unregister(&edma_driver); | |
641 | ret = PTR_ERR(pdev0); | |
642 | goto out; | |
643 | } | |
644 | } | |
645 | ||
646 | if (EDMA_CTLRS == 2) { | |
647 | pdev1 = platform_device_register_full(&edma_dev_info1); | |
648 | if (IS_ERR(pdev1)) { | |
649 | platform_driver_unregister(&edma_driver); | |
650 | platform_device_unregister(pdev0); | |
651 | ret = PTR_ERR(pdev1); | |
652 | } | |
653 | } | |
654 | ||
655 | out: | |
656 | return ret; | |
657 | } | |
658 | subsys_initcall(edma_init); | |
659 | ||
660 | static void __exit edma_exit(void) | |
661 | { | |
662 | platform_device_unregister(pdev0); | |
663 | if (pdev1) | |
664 | platform_device_unregister(pdev1); | |
665 | platform_driver_unregister(&edma_driver); | |
666 | } | |
667 | module_exit(edma_exit); | |
668 | ||
669 | MODULE_AUTHOR("Matt Porter <mporter@ti.com>"); | |
670 | MODULE_DESCRIPTION("TI EDMA DMA engine driver"); | |
671 | MODULE_LICENSE("GPL v2"); |