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d800edeb JB |
1 | /* linux/arch/arm/plat-samsung/s3c-pl330.c |
2 | * | |
3 | * Copyright (C) 2010 Samsung Electronics Co. Ltd. | |
4 | * Jaswinder Singh <jassi.brar@samsung.com> | |
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 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/platform_device.h> | |
6c69abb2 SY |
18 | #include <linux/clk.h> |
19 | #include <linux/err.h> | |
d800edeb JB |
20 | |
21 | #include <asm/hardware/pl330.h> | |
22 | ||
23 | #include <plat/s3c-pl330-pdata.h> | |
24 | ||
25 | /** | |
26 | * struct s3c_pl330_dmac - Logical representation of a PL330 DMAC. | |
27 | * @busy_chan: Number of channels currently busy. | |
28 | * @peri: List of IDs of peripherals this DMAC can work with. | |
29 | * @node: To attach to the global list of DMACs. | |
30 | * @pi: PL330 configuration info for the DMAC. | |
31 | * @kmcache: Pool to quickly allocate xfers for all channels in the dmac. | |
6c69abb2 | 32 | * @clk: Pointer of DMAC operation clock. |
d800edeb JB |
33 | */ |
34 | struct s3c_pl330_dmac { | |
35 | unsigned busy_chan; | |
36 | enum dma_ch *peri; | |
37 | struct list_head node; | |
38 | struct pl330_info *pi; | |
39 | struct kmem_cache *kmcache; | |
6c69abb2 | 40 | struct clk *clk; |
d800edeb JB |
41 | }; |
42 | ||
43 | /** | |
44 | * struct s3c_pl330_xfer - A request submitted by S3C DMA clients. | |
45 | * @token: Xfer ID provided by the client. | |
46 | * @node: To attach to the list of xfers on a channel. | |
47 | * @px: Xfer for PL330 core. | |
48 | * @chan: Owner channel of this xfer. | |
49 | */ | |
50 | struct s3c_pl330_xfer { | |
51 | void *token; | |
52 | struct list_head node; | |
53 | struct pl330_xfer px; | |
54 | struct s3c_pl330_chan *chan; | |
55 | }; | |
56 | ||
57 | /** | |
58 | * struct s3c_pl330_chan - Logical channel to communicate with | |
59 | * a Physical peripheral. | |
60 | * @pl330_chan_id: Token of a hardware channel thread of PL330 DMAC. | |
61 | * NULL if the channel is available to be acquired. | |
62 | * @id: ID of the peripheral that this channel can communicate with. | |
63 | * @options: Options specified by the client. | |
64 | * @sdaddr: Address provided via s3c2410_dma_devconfig. | |
65 | * @node: To attach to the global list of channels. | |
66 | * @lrq: Pointer to the last submitted pl330_req to PL330 core. | |
67 | * @xfer_list: To manage list of xfers enqueued. | |
68 | * @req: Two requests to communicate with the PL330 engine. | |
69 | * @callback_fn: Callback function to the client. | |
70 | * @rqcfg: Channel configuration for the xfers. | |
25985edc | 71 | * @xfer_head: Pointer to the xfer to be next executed. |
d800edeb JB |
72 | * @dmac: Pointer to the DMAC that manages this channel, NULL if the |
73 | * channel is available to be acquired. | |
74 | * @client: Client of this channel. NULL if the | |
75 | * channel is available to be acquired. | |
76 | */ | |
77 | struct s3c_pl330_chan { | |
78 | void *pl330_chan_id; | |
79 | enum dma_ch id; | |
80 | unsigned int options; | |
81 | unsigned long sdaddr; | |
82 | struct list_head node; | |
83 | struct pl330_req *lrq; | |
84 | struct list_head xfer_list; | |
85 | struct pl330_req req[2]; | |
86 | s3c2410_dma_cbfn_t callback_fn; | |
87 | struct pl330_reqcfg rqcfg; | |
88 | struct s3c_pl330_xfer *xfer_head; | |
89 | struct s3c_pl330_dmac *dmac; | |
90 | struct s3c2410_dma_client *client; | |
91 | }; | |
92 | ||
93 | /* All DMACs in the platform */ | |
94 | static LIST_HEAD(dmac_list); | |
95 | ||
96 | /* All channels to peripherals in the platform */ | |
97 | static LIST_HEAD(chan_list); | |
98 | ||
99 | /* | |
100 | * Since we add resources(DMACs and Channels) to the global pool, | |
101 | * we need to guard access to the resources using a global lock | |
102 | */ | |
103 | static DEFINE_SPINLOCK(res_lock); | |
104 | ||
105 | /* Returns the channel with ID 'id' in the chan_list */ | |
106 | static struct s3c_pl330_chan *id_to_chan(const enum dma_ch id) | |
107 | { | |
108 | struct s3c_pl330_chan *ch; | |
109 | ||
110 | list_for_each_entry(ch, &chan_list, node) | |
111 | if (ch->id == id) | |
112 | return ch; | |
113 | ||
114 | return NULL; | |
115 | } | |
116 | ||
117 | /* Allocate a new channel with ID 'id' and add to chan_list */ | |
118 | static void chan_add(const enum dma_ch id) | |
119 | { | |
120 | struct s3c_pl330_chan *ch = id_to_chan(id); | |
121 | ||
122 | /* Return if the channel already exists */ | |
123 | if (ch) | |
124 | return; | |
125 | ||
126 | ch = kmalloc(sizeof(*ch), GFP_KERNEL); | |
127 | /* Return silently to work with other channels */ | |
128 | if (!ch) | |
129 | return; | |
130 | ||
131 | ch->id = id; | |
132 | ch->dmac = NULL; | |
133 | ||
134 | list_add_tail(&ch->node, &chan_list); | |
135 | } | |
136 | ||
137 | /* If the channel is not yet acquired by any client */ | |
138 | static bool chan_free(struct s3c_pl330_chan *ch) | |
139 | { | |
140 | if (!ch) | |
141 | return false; | |
142 | ||
143 | /* Channel points to some DMAC only when it's acquired */ | |
144 | return ch->dmac ? false : true; | |
145 | } | |
146 | ||
147 | /* | |
148 | * Returns 0 is peripheral i/f is invalid or not present on the dmac. | |
149 | * Index + 1, otherwise. | |
150 | */ | |
151 | static unsigned iface_of_dmac(struct s3c_pl330_dmac *dmac, enum dma_ch ch_id) | |
152 | { | |
153 | enum dma_ch *id = dmac->peri; | |
154 | int i; | |
155 | ||
156 | /* Discount invalid markers */ | |
157 | if (ch_id == DMACH_MAX) | |
158 | return 0; | |
159 | ||
160 | for (i = 0; i < PL330_MAX_PERI; i++) | |
161 | if (id[i] == ch_id) | |
162 | return i + 1; | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | /* If all channel threads of the DMAC are busy */ | |
168 | static inline bool dmac_busy(struct s3c_pl330_dmac *dmac) | |
169 | { | |
170 | struct pl330_info *pi = dmac->pi; | |
171 | ||
172 | return (dmac->busy_chan < pi->pcfg.num_chan) ? false : true; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Returns the number of free channels that | |
177 | * can be handled by this dmac only. | |
178 | */ | |
179 | static unsigned ch_onlyby_dmac(struct s3c_pl330_dmac *dmac) | |
180 | { | |
181 | enum dma_ch *id = dmac->peri; | |
182 | struct s3c_pl330_dmac *d; | |
183 | struct s3c_pl330_chan *ch; | |
184 | unsigned found, count = 0; | |
185 | enum dma_ch p; | |
186 | int i; | |
187 | ||
188 | for (i = 0; i < PL330_MAX_PERI; i++) { | |
189 | p = id[i]; | |
190 | ch = id_to_chan(p); | |
191 | ||
192 | if (p == DMACH_MAX || !chan_free(ch)) | |
193 | continue; | |
194 | ||
195 | found = 0; | |
196 | list_for_each_entry(d, &dmac_list, node) { | |
197 | if (d != dmac && iface_of_dmac(d, ch->id)) { | |
198 | found = 1; | |
199 | break; | |
200 | } | |
201 | } | |
202 | if (!found) | |
203 | count++; | |
204 | } | |
205 | ||
206 | return count; | |
207 | } | |
208 | ||
209 | /* | |
210 | * Measure of suitability of 'dmac' handling 'ch' | |
211 | * | |
212 | * 0 indicates 'dmac' can not handle 'ch' either | |
213 | * because it is not supported by the hardware or | |
214 | * because all dmac channels are currently busy. | |
215 | * | |
216 | * >0 vlaue indicates 'dmac' has the capability. | |
217 | * The bigger the value the more suitable the dmac. | |
218 | */ | |
219 | #define MAX_SUIT UINT_MAX | |
220 | #define MIN_SUIT 0 | |
221 | ||
222 | static unsigned suitablility(struct s3c_pl330_dmac *dmac, | |
223 | struct s3c_pl330_chan *ch) | |
224 | { | |
225 | struct pl330_info *pi = dmac->pi; | |
226 | enum dma_ch *id = dmac->peri; | |
227 | struct s3c_pl330_dmac *d; | |
228 | unsigned s; | |
229 | int i; | |
230 | ||
231 | s = MIN_SUIT; | |
232 | /* If all the DMAC channel threads are busy */ | |
233 | if (dmac_busy(dmac)) | |
234 | return s; | |
235 | ||
236 | for (i = 0; i < PL330_MAX_PERI; i++) | |
237 | if (id[i] == ch->id) | |
238 | break; | |
239 | ||
240 | /* If the 'dmac' can't talk to 'ch' */ | |
241 | if (i == PL330_MAX_PERI) | |
242 | return s; | |
243 | ||
244 | s = MAX_SUIT; | |
245 | list_for_each_entry(d, &dmac_list, node) { | |
246 | /* | |
247 | * If some other dmac can talk to this | |
248 | * peri and has some channel free. | |
249 | */ | |
250 | if (d != dmac && iface_of_dmac(d, ch->id) && !dmac_busy(d)) { | |
251 | s = 0; | |
252 | break; | |
253 | } | |
254 | } | |
255 | if (s) | |
256 | return s; | |
257 | ||
258 | s = 100; | |
259 | ||
260 | /* Good if free chans are more, bad otherwise */ | |
261 | s += (pi->pcfg.num_chan - dmac->busy_chan) - ch_onlyby_dmac(dmac); | |
262 | ||
263 | return s; | |
264 | } | |
265 | ||
266 | /* More than one DMAC may have capability to transfer data with the | |
267 | * peripheral. This function assigns most suitable DMAC to manage the | |
268 | * channel and hence communicate with the peripheral. | |
269 | */ | |
270 | static struct s3c_pl330_dmac *map_chan_to_dmac(struct s3c_pl330_chan *ch) | |
271 | { | |
272 | struct s3c_pl330_dmac *d, *dmac = NULL; | |
273 | unsigned sn, sl = MIN_SUIT; | |
274 | ||
275 | list_for_each_entry(d, &dmac_list, node) { | |
276 | sn = suitablility(d, ch); | |
277 | ||
278 | if (sn == MAX_SUIT) | |
279 | return d; | |
280 | ||
281 | if (sn > sl) | |
282 | dmac = d; | |
283 | } | |
284 | ||
285 | return dmac; | |
286 | } | |
287 | ||
288 | /* Acquire the channel for peripheral 'id' */ | |
289 | static struct s3c_pl330_chan *chan_acquire(const enum dma_ch id) | |
290 | { | |
291 | struct s3c_pl330_chan *ch = id_to_chan(id); | |
292 | struct s3c_pl330_dmac *dmac; | |
293 | ||
294 | /* If the channel doesn't exist or is already acquired */ | |
295 | if (!ch || !chan_free(ch)) { | |
296 | ch = NULL; | |
297 | goto acq_exit; | |
298 | } | |
299 | ||
300 | dmac = map_chan_to_dmac(ch); | |
301 | /* If couldn't map */ | |
302 | if (!dmac) { | |
303 | ch = NULL; | |
304 | goto acq_exit; | |
305 | } | |
306 | ||
307 | dmac->busy_chan++; | |
308 | ch->dmac = dmac; | |
309 | ||
310 | acq_exit: | |
311 | return ch; | |
312 | } | |
313 | ||
314 | /* Delete xfer from the queue */ | |
315 | static inline void del_from_queue(struct s3c_pl330_xfer *xfer) | |
316 | { | |
317 | struct s3c_pl330_xfer *t; | |
318 | struct s3c_pl330_chan *ch; | |
319 | int found; | |
320 | ||
321 | if (!xfer) | |
322 | return; | |
323 | ||
324 | ch = xfer->chan; | |
325 | ||
326 | /* Make sure xfer is in the queue */ | |
327 | found = 0; | |
328 | list_for_each_entry(t, &ch->xfer_list, node) | |
329 | if (t == xfer) { | |
330 | found = 1; | |
331 | break; | |
332 | } | |
333 | ||
334 | if (!found) | |
335 | return; | |
336 | ||
337 | /* If xfer is last entry in the queue */ | |
338 | if (xfer->node.next == &ch->xfer_list) | |
339 | t = list_entry(ch->xfer_list.next, | |
340 | struct s3c_pl330_xfer, node); | |
341 | else | |
342 | t = list_entry(xfer->node.next, | |
343 | struct s3c_pl330_xfer, node); | |
344 | ||
345 | /* If there was only one node left */ | |
346 | if (t == xfer) | |
347 | ch->xfer_head = NULL; | |
348 | else if (ch->xfer_head == xfer) | |
349 | ch->xfer_head = t; | |
350 | ||
351 | list_del(&xfer->node); | |
352 | } | |
353 | ||
354 | /* Provides pointer to the next xfer in the queue. | |
355 | * If CIRCULAR option is set, the list is left intact, | |
356 | * otherwise the xfer is removed from the list. | |
357 | * Forced delete 'pluck' can be set to override the CIRCULAR option. | |
358 | */ | |
359 | static struct s3c_pl330_xfer *get_from_queue(struct s3c_pl330_chan *ch, | |
360 | int pluck) | |
361 | { | |
362 | struct s3c_pl330_xfer *xfer = ch->xfer_head; | |
363 | ||
364 | if (!xfer) | |
365 | return NULL; | |
366 | ||
367 | /* If xfer is last entry in the queue */ | |
368 | if (xfer->node.next == &ch->xfer_list) | |
369 | ch->xfer_head = list_entry(ch->xfer_list.next, | |
370 | struct s3c_pl330_xfer, node); | |
371 | else | |
372 | ch->xfer_head = list_entry(xfer->node.next, | |
373 | struct s3c_pl330_xfer, node); | |
374 | ||
375 | if (pluck || !(ch->options & S3C2410_DMAF_CIRCULAR)) | |
376 | del_from_queue(xfer); | |
377 | ||
378 | return xfer; | |
379 | } | |
380 | ||
381 | static inline void add_to_queue(struct s3c_pl330_chan *ch, | |
382 | struct s3c_pl330_xfer *xfer, int front) | |
383 | { | |
384 | struct pl330_xfer *xt; | |
385 | ||
386 | /* If queue empty */ | |
387 | if (ch->xfer_head == NULL) | |
388 | ch->xfer_head = xfer; | |
389 | ||
390 | xt = &ch->xfer_head->px; | |
391 | /* If the head already submitted (CIRCULAR head) */ | |
392 | if (ch->options & S3C2410_DMAF_CIRCULAR && | |
393 | (xt == ch->req[0].x || xt == ch->req[1].x)) | |
394 | ch->xfer_head = xfer; | |
395 | ||
396 | /* If this is a resubmission, it should go at the head */ | |
397 | if (front) { | |
398 | ch->xfer_head = xfer; | |
399 | list_add(&xfer->node, &ch->xfer_list); | |
400 | } else { | |
401 | list_add_tail(&xfer->node, &ch->xfer_list); | |
402 | } | |
403 | } | |
404 | ||
405 | static inline void _finish_off(struct s3c_pl330_xfer *xfer, | |
406 | enum s3c2410_dma_buffresult res, int ffree) | |
407 | { | |
408 | struct s3c_pl330_chan *ch; | |
409 | ||
410 | if (!xfer) | |
411 | return; | |
412 | ||
413 | ch = xfer->chan; | |
414 | ||
415 | /* Do callback */ | |
416 | if (ch->callback_fn) | |
417 | ch->callback_fn(NULL, xfer->token, xfer->px.bytes, res); | |
418 | ||
419 | /* Force Free or if buffer is not needed anymore */ | |
420 | if (ffree || !(ch->options & S3C2410_DMAF_CIRCULAR)) | |
421 | kmem_cache_free(ch->dmac->kmcache, xfer); | |
422 | } | |
423 | ||
424 | static inline int s3c_pl330_submit(struct s3c_pl330_chan *ch, | |
425 | struct pl330_req *r) | |
426 | { | |
427 | struct s3c_pl330_xfer *xfer; | |
428 | int ret = 0; | |
429 | ||
430 | /* If already submitted */ | |
431 | if (r->x) | |
432 | return 0; | |
433 | ||
434 | xfer = get_from_queue(ch, 0); | |
435 | if (xfer) { | |
436 | r->x = &xfer->px; | |
437 | ||
438 | /* Use max bandwidth for M<->M xfers */ | |
439 | if (r->rqtype == MEMTOMEM) { | |
440 | struct pl330_info *pi = xfer->chan->dmac->pi; | |
441 | int burst = 1 << ch->rqcfg.brst_size; | |
442 | u32 bytes = r->x->bytes; | |
443 | int bl; | |
444 | ||
445 | bl = pi->pcfg.data_bus_width / 8; | |
446 | bl *= pi->pcfg.data_buf_dep; | |
447 | bl /= burst; | |
448 | ||
449 | /* src/dst_burst_len can't be more than 16 */ | |
450 | if (bl > 16) | |
451 | bl = 16; | |
452 | ||
453 | while (bl > 1) { | |
454 | if (!(bytes % (bl * burst))) | |
455 | break; | |
456 | bl--; | |
457 | } | |
458 | ||
459 | ch->rqcfg.brst_len = bl; | |
460 | } else { | |
461 | ch->rqcfg.brst_len = 1; | |
462 | } | |
463 | ||
464 | ret = pl330_submit_req(ch->pl330_chan_id, r); | |
465 | ||
466 | /* If submission was successful */ | |
467 | if (!ret) { | |
468 | ch->lrq = r; /* latest submitted req */ | |
469 | return 0; | |
470 | } | |
471 | ||
472 | r->x = NULL; | |
473 | ||
474 | /* If both of the PL330 ping-pong buffers filled */ | |
475 | if (ret == -EAGAIN) { | |
476 | dev_err(ch->dmac->pi->dev, "%s:%d!\n", | |
477 | __func__, __LINE__); | |
478 | /* Queue back again */ | |
479 | add_to_queue(ch, xfer, 1); | |
480 | ret = 0; | |
481 | } else { | |
482 | dev_err(ch->dmac->pi->dev, "%s:%d!\n", | |
483 | __func__, __LINE__); | |
484 | _finish_off(xfer, S3C2410_RES_ERR, 0); | |
485 | } | |
486 | } | |
487 | ||
488 | return ret; | |
489 | } | |
490 | ||
491 | static void s3c_pl330_rq(struct s3c_pl330_chan *ch, | |
492 | struct pl330_req *r, enum pl330_op_err err) | |
493 | { | |
494 | unsigned long flags; | |
495 | struct s3c_pl330_xfer *xfer; | |
496 | struct pl330_xfer *xl = r->x; | |
497 | enum s3c2410_dma_buffresult res; | |
498 | ||
499 | spin_lock_irqsave(&res_lock, flags); | |
500 | ||
501 | r->x = NULL; | |
502 | ||
503 | s3c_pl330_submit(ch, r); | |
504 | ||
505 | spin_unlock_irqrestore(&res_lock, flags); | |
506 | ||
507 | /* Map result to S3C DMA API */ | |
508 | if (err == PL330_ERR_NONE) | |
509 | res = S3C2410_RES_OK; | |
510 | else if (err == PL330_ERR_ABORT) | |
511 | res = S3C2410_RES_ABORT; | |
512 | else | |
513 | res = S3C2410_RES_ERR; | |
514 | ||
515 | /* If last request had some xfer */ | |
516 | if (xl) { | |
517 | xfer = container_of(xl, struct s3c_pl330_xfer, px); | |
518 | _finish_off(xfer, res, 0); | |
519 | } else { | |
520 | dev_info(ch->dmac->pi->dev, "%s:%d No Xfer?!\n", | |
521 | __func__, __LINE__); | |
522 | } | |
523 | } | |
524 | ||
525 | static void s3c_pl330_rq0(void *token, enum pl330_op_err err) | |
526 | { | |
527 | struct pl330_req *r = token; | |
528 | struct s3c_pl330_chan *ch = container_of(r, | |
529 | struct s3c_pl330_chan, req[0]); | |
530 | s3c_pl330_rq(ch, r, err); | |
531 | } | |
532 | ||
533 | static void s3c_pl330_rq1(void *token, enum pl330_op_err err) | |
534 | { | |
535 | struct pl330_req *r = token; | |
536 | struct s3c_pl330_chan *ch = container_of(r, | |
537 | struct s3c_pl330_chan, req[1]); | |
538 | s3c_pl330_rq(ch, r, err); | |
539 | } | |
540 | ||
541 | /* Release an acquired channel */ | |
542 | static void chan_release(struct s3c_pl330_chan *ch) | |
543 | { | |
544 | struct s3c_pl330_dmac *dmac; | |
545 | ||
546 | if (chan_free(ch)) | |
547 | return; | |
548 | ||
549 | dmac = ch->dmac; | |
550 | ch->dmac = NULL; | |
551 | dmac->busy_chan--; | |
552 | } | |
553 | ||
554 | int s3c2410_dma_ctrl(enum dma_ch id, enum s3c2410_chan_op op) | |
555 | { | |
556 | struct s3c_pl330_xfer *xfer; | |
557 | enum pl330_chan_op pl330op; | |
558 | struct s3c_pl330_chan *ch; | |
559 | unsigned long flags; | |
560 | int idx, ret; | |
561 | ||
562 | spin_lock_irqsave(&res_lock, flags); | |
563 | ||
564 | ch = id_to_chan(id); | |
565 | ||
566 | if (!ch || chan_free(ch)) { | |
567 | ret = -EINVAL; | |
568 | goto ctrl_exit; | |
569 | } | |
570 | ||
571 | switch (op) { | |
572 | case S3C2410_DMAOP_START: | |
573 | /* Make sure both reqs are enqueued */ | |
574 | idx = (ch->lrq == &ch->req[0]) ? 1 : 0; | |
575 | s3c_pl330_submit(ch, &ch->req[idx]); | |
576 | s3c_pl330_submit(ch, &ch->req[1 - idx]); | |
577 | pl330op = PL330_OP_START; | |
578 | break; | |
579 | ||
580 | case S3C2410_DMAOP_STOP: | |
581 | pl330op = PL330_OP_ABORT; | |
582 | break; | |
583 | ||
584 | case S3C2410_DMAOP_FLUSH: | |
585 | pl330op = PL330_OP_FLUSH; | |
586 | break; | |
587 | ||
588 | case S3C2410_DMAOP_PAUSE: | |
589 | case S3C2410_DMAOP_RESUME: | |
590 | case S3C2410_DMAOP_TIMEOUT: | |
591 | case S3C2410_DMAOP_STARTED: | |
592 | spin_unlock_irqrestore(&res_lock, flags); | |
593 | return 0; | |
594 | ||
595 | default: | |
596 | spin_unlock_irqrestore(&res_lock, flags); | |
597 | return -EINVAL; | |
598 | } | |
599 | ||
600 | ret = pl330_chan_ctrl(ch->pl330_chan_id, pl330op); | |
601 | ||
602 | if (pl330op == PL330_OP_START) { | |
603 | spin_unlock_irqrestore(&res_lock, flags); | |
604 | return ret; | |
605 | } | |
606 | ||
607 | idx = (ch->lrq == &ch->req[0]) ? 1 : 0; | |
608 | ||
609 | /* Abort the current xfer */ | |
610 | if (ch->req[idx].x) { | |
611 | xfer = container_of(ch->req[idx].x, | |
612 | struct s3c_pl330_xfer, px); | |
613 | ||
614 | /* Drop xfer during FLUSH */ | |
615 | if (pl330op == PL330_OP_FLUSH) | |
616 | del_from_queue(xfer); | |
617 | ||
618 | ch->req[idx].x = NULL; | |
619 | ||
620 | spin_unlock_irqrestore(&res_lock, flags); | |
621 | _finish_off(xfer, S3C2410_RES_ABORT, | |
622 | pl330op == PL330_OP_FLUSH ? 1 : 0); | |
623 | spin_lock_irqsave(&res_lock, flags); | |
624 | } | |
625 | ||
626 | /* Flush the whole queue */ | |
627 | if (pl330op == PL330_OP_FLUSH) { | |
628 | ||
629 | if (ch->req[1 - idx].x) { | |
630 | xfer = container_of(ch->req[1 - idx].x, | |
631 | struct s3c_pl330_xfer, px); | |
632 | ||
633 | del_from_queue(xfer); | |
634 | ||
635 | ch->req[1 - idx].x = NULL; | |
636 | ||
637 | spin_unlock_irqrestore(&res_lock, flags); | |
638 | _finish_off(xfer, S3C2410_RES_ABORT, 1); | |
639 | spin_lock_irqsave(&res_lock, flags); | |
640 | } | |
641 | ||
642 | /* Finish off the remaining in the queue */ | |
643 | xfer = ch->xfer_head; | |
644 | while (xfer) { | |
645 | ||
646 | del_from_queue(xfer); | |
647 | ||
648 | spin_unlock_irqrestore(&res_lock, flags); | |
649 | _finish_off(xfer, S3C2410_RES_ABORT, 1); | |
650 | spin_lock_irqsave(&res_lock, flags); | |
651 | ||
652 | xfer = ch->xfer_head; | |
653 | } | |
654 | } | |
655 | ||
656 | ctrl_exit: | |
657 | spin_unlock_irqrestore(&res_lock, flags); | |
658 | ||
659 | return ret; | |
660 | } | |
661 | EXPORT_SYMBOL(s3c2410_dma_ctrl); | |
662 | ||
663 | int s3c2410_dma_enqueue(enum dma_ch id, void *token, | |
664 | dma_addr_t addr, int size) | |
665 | { | |
666 | struct s3c_pl330_chan *ch; | |
667 | struct s3c_pl330_xfer *xfer; | |
668 | unsigned long flags; | |
669 | int idx, ret = 0; | |
670 | ||
671 | spin_lock_irqsave(&res_lock, flags); | |
672 | ||
673 | ch = id_to_chan(id); | |
674 | ||
675 | /* Error if invalid or free channel */ | |
676 | if (!ch || chan_free(ch)) { | |
677 | ret = -EINVAL; | |
678 | goto enq_exit; | |
679 | } | |
680 | ||
681 | /* Error if size is unaligned */ | |
682 | if (ch->rqcfg.brst_size && size % (1 << ch->rqcfg.brst_size)) { | |
683 | ret = -EINVAL; | |
684 | goto enq_exit; | |
685 | } | |
686 | ||
687 | xfer = kmem_cache_alloc(ch->dmac->kmcache, GFP_ATOMIC); | |
688 | if (!xfer) { | |
689 | ret = -ENOMEM; | |
690 | goto enq_exit; | |
691 | } | |
692 | ||
693 | xfer->token = token; | |
694 | xfer->chan = ch; | |
695 | xfer->px.bytes = size; | |
696 | xfer->px.next = NULL; /* Single request */ | |
697 | ||
698 | /* For S3C DMA API, direction is always fixed for all xfers */ | |
699 | if (ch->req[0].rqtype == MEMTODEV) { | |
700 | xfer->px.src_addr = addr; | |
701 | xfer->px.dst_addr = ch->sdaddr; | |
702 | } else { | |
703 | xfer->px.src_addr = ch->sdaddr; | |
704 | xfer->px.dst_addr = addr; | |
705 | } | |
706 | ||
707 | add_to_queue(ch, xfer, 0); | |
708 | ||
709 | /* Try submitting on either request */ | |
710 | idx = (ch->lrq == &ch->req[0]) ? 1 : 0; | |
711 | ||
712 | if (!ch->req[idx].x) | |
713 | s3c_pl330_submit(ch, &ch->req[idx]); | |
714 | else | |
715 | s3c_pl330_submit(ch, &ch->req[1 - idx]); | |
716 | ||
717 | spin_unlock_irqrestore(&res_lock, flags); | |
718 | ||
719 | if (ch->options & S3C2410_DMAF_AUTOSTART) | |
720 | s3c2410_dma_ctrl(id, S3C2410_DMAOP_START); | |
721 | ||
722 | return 0; | |
723 | ||
724 | enq_exit: | |
725 | spin_unlock_irqrestore(&res_lock, flags); | |
726 | ||
727 | return ret; | |
728 | } | |
729 | EXPORT_SYMBOL(s3c2410_dma_enqueue); | |
730 | ||
731 | int s3c2410_dma_request(enum dma_ch id, | |
732 | struct s3c2410_dma_client *client, | |
733 | void *dev) | |
734 | { | |
735 | struct s3c_pl330_dmac *dmac; | |
736 | struct s3c_pl330_chan *ch; | |
737 | unsigned long flags; | |
738 | int ret = 0; | |
739 | ||
740 | spin_lock_irqsave(&res_lock, flags); | |
741 | ||
742 | ch = chan_acquire(id); | |
743 | if (!ch) { | |
744 | ret = -EBUSY; | |
745 | goto req_exit; | |
746 | } | |
747 | ||
748 | dmac = ch->dmac; | |
749 | ||
750 | ch->pl330_chan_id = pl330_request_channel(dmac->pi); | |
751 | if (!ch->pl330_chan_id) { | |
752 | chan_release(ch); | |
753 | ret = -EBUSY; | |
754 | goto req_exit; | |
755 | } | |
756 | ||
757 | ch->client = client; | |
758 | ch->options = 0; /* Clear any option */ | |
759 | ch->callback_fn = NULL; /* Clear any callback */ | |
760 | ch->lrq = NULL; | |
761 | ||
762 | ch->rqcfg.brst_size = 2; /* Default word size */ | |
763 | ch->rqcfg.swap = SWAP_NO; | |
764 | ch->rqcfg.scctl = SCCTRL0; /* Noncacheable and nonbufferable */ | |
765 | ch->rqcfg.dcctl = DCCTRL0; /* Noncacheable and nonbufferable */ | |
766 | ch->rqcfg.privileged = 0; | |
767 | ch->rqcfg.insnaccess = 0; | |
768 | ||
769 | /* Set invalid direction */ | |
770 | ch->req[0].rqtype = DEVTODEV; | |
771 | ch->req[1].rqtype = ch->req[0].rqtype; | |
772 | ||
773 | ch->req[0].cfg = &ch->rqcfg; | |
774 | ch->req[1].cfg = ch->req[0].cfg; | |
775 | ||
776 | ch->req[0].peri = iface_of_dmac(dmac, id) - 1; /* Original index */ | |
777 | ch->req[1].peri = ch->req[0].peri; | |
778 | ||
779 | ch->req[0].token = &ch->req[0]; | |
780 | ch->req[0].xfer_cb = s3c_pl330_rq0; | |
781 | ch->req[1].token = &ch->req[1]; | |
782 | ch->req[1].xfer_cb = s3c_pl330_rq1; | |
783 | ||
784 | ch->req[0].x = NULL; | |
785 | ch->req[1].x = NULL; | |
786 | ||
787 | /* Reset xfer list */ | |
788 | INIT_LIST_HEAD(&ch->xfer_list); | |
789 | ch->xfer_head = NULL; | |
790 | ||
791 | req_exit: | |
792 | spin_unlock_irqrestore(&res_lock, flags); | |
793 | ||
794 | return ret; | |
795 | } | |
796 | EXPORT_SYMBOL(s3c2410_dma_request); | |
797 | ||
798 | int s3c2410_dma_free(enum dma_ch id, struct s3c2410_dma_client *client) | |
799 | { | |
800 | struct s3c_pl330_chan *ch; | |
801 | struct s3c_pl330_xfer *xfer; | |
802 | unsigned long flags; | |
803 | int ret = 0; | |
804 | unsigned idx; | |
805 | ||
806 | spin_lock_irqsave(&res_lock, flags); | |
807 | ||
808 | ch = id_to_chan(id); | |
809 | ||
810 | if (!ch || chan_free(ch)) | |
811 | goto free_exit; | |
812 | ||
813 | /* Refuse if someone else wanted to free the channel */ | |
814 | if (ch->client != client) { | |
815 | ret = -EBUSY; | |
816 | goto free_exit; | |
817 | } | |
818 | ||
819 | /* Stop any active xfer, Flushe the queue and do callbacks */ | |
820 | pl330_chan_ctrl(ch->pl330_chan_id, PL330_OP_FLUSH); | |
821 | ||
822 | /* Abort the submitted requests */ | |
823 | idx = (ch->lrq == &ch->req[0]) ? 1 : 0; | |
824 | ||
825 | if (ch->req[idx].x) { | |
826 | xfer = container_of(ch->req[idx].x, | |
827 | struct s3c_pl330_xfer, px); | |
828 | ||
829 | ch->req[idx].x = NULL; | |
830 | del_from_queue(xfer); | |
831 | ||
832 | spin_unlock_irqrestore(&res_lock, flags); | |
833 | _finish_off(xfer, S3C2410_RES_ABORT, 1); | |
834 | spin_lock_irqsave(&res_lock, flags); | |
835 | } | |
836 | ||
837 | if (ch->req[1 - idx].x) { | |
838 | xfer = container_of(ch->req[1 - idx].x, | |
839 | struct s3c_pl330_xfer, px); | |
840 | ||
841 | ch->req[1 - idx].x = NULL; | |
842 | del_from_queue(xfer); | |
843 | ||
844 | spin_unlock_irqrestore(&res_lock, flags); | |
845 | _finish_off(xfer, S3C2410_RES_ABORT, 1); | |
846 | spin_lock_irqsave(&res_lock, flags); | |
847 | } | |
848 | ||
849 | /* Pluck and Abort the queued requests in order */ | |
850 | do { | |
851 | xfer = get_from_queue(ch, 1); | |
852 | ||
853 | spin_unlock_irqrestore(&res_lock, flags); | |
854 | _finish_off(xfer, S3C2410_RES_ABORT, 1); | |
855 | spin_lock_irqsave(&res_lock, flags); | |
856 | } while (xfer); | |
857 | ||
858 | ch->client = NULL; | |
859 | ||
860 | pl330_release_channel(ch->pl330_chan_id); | |
861 | ||
862 | ch->pl330_chan_id = NULL; | |
863 | ||
864 | chan_release(ch); | |
865 | ||
866 | free_exit: | |
867 | spin_unlock_irqrestore(&res_lock, flags); | |
868 | ||
869 | return ret; | |
870 | } | |
871 | EXPORT_SYMBOL(s3c2410_dma_free); | |
872 | ||
873 | int s3c2410_dma_config(enum dma_ch id, int xferunit) | |
874 | { | |
875 | struct s3c_pl330_chan *ch; | |
876 | struct pl330_info *pi; | |
877 | unsigned long flags; | |
878 | int i, dbwidth, ret = 0; | |
879 | ||
880 | spin_lock_irqsave(&res_lock, flags); | |
881 | ||
882 | ch = id_to_chan(id); | |
883 | ||
884 | if (!ch || chan_free(ch)) { | |
885 | ret = -EINVAL; | |
886 | goto cfg_exit; | |
887 | } | |
888 | ||
889 | pi = ch->dmac->pi; | |
890 | dbwidth = pi->pcfg.data_bus_width / 8; | |
891 | ||
892 | /* Max size of xfer can be pcfg.data_bus_width */ | |
893 | if (xferunit > dbwidth) { | |
894 | ret = -EINVAL; | |
895 | goto cfg_exit; | |
896 | } | |
897 | ||
898 | i = 0; | |
899 | while (xferunit != (1 << i)) | |
900 | i++; | |
901 | ||
902 | /* If valid value */ | |
903 | if (xferunit == (1 << i)) | |
904 | ch->rqcfg.brst_size = i; | |
905 | else | |
906 | ret = -EINVAL; | |
907 | ||
908 | cfg_exit: | |
909 | spin_unlock_irqrestore(&res_lock, flags); | |
910 | ||
911 | return ret; | |
912 | } | |
913 | EXPORT_SYMBOL(s3c2410_dma_config); | |
914 | ||
915 | /* Options that are supported by this driver */ | |
916 | #define S3C_PL330_FLAGS (S3C2410_DMAF_CIRCULAR | S3C2410_DMAF_AUTOSTART) | |
917 | ||
918 | int s3c2410_dma_setflags(enum dma_ch id, unsigned int options) | |
919 | { | |
920 | struct s3c_pl330_chan *ch; | |
921 | unsigned long flags; | |
922 | int ret = 0; | |
923 | ||
924 | spin_lock_irqsave(&res_lock, flags); | |
925 | ||
926 | ch = id_to_chan(id); | |
927 | ||
928 | if (!ch || chan_free(ch) || options & ~(S3C_PL330_FLAGS)) | |
929 | ret = -EINVAL; | |
930 | else | |
931 | ch->options = options; | |
932 | ||
933 | spin_unlock_irqrestore(&res_lock, flags); | |
934 | ||
935 | return 0; | |
936 | } | |
937 | EXPORT_SYMBOL(s3c2410_dma_setflags); | |
938 | ||
939 | int s3c2410_dma_set_buffdone_fn(enum dma_ch id, s3c2410_dma_cbfn_t rtn) | |
940 | { | |
941 | struct s3c_pl330_chan *ch; | |
942 | unsigned long flags; | |
943 | int ret = 0; | |
944 | ||
945 | spin_lock_irqsave(&res_lock, flags); | |
946 | ||
947 | ch = id_to_chan(id); | |
948 | ||
949 | if (!ch || chan_free(ch)) | |
950 | ret = -EINVAL; | |
951 | else | |
952 | ch->callback_fn = rtn; | |
953 | ||
954 | spin_unlock_irqrestore(&res_lock, flags); | |
955 | ||
956 | return ret; | |
957 | } | |
958 | EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn); | |
959 | ||
960 | int s3c2410_dma_devconfig(enum dma_ch id, enum s3c2410_dmasrc source, | |
961 | unsigned long address) | |
962 | { | |
963 | struct s3c_pl330_chan *ch; | |
964 | unsigned long flags; | |
965 | int ret = 0; | |
966 | ||
967 | spin_lock_irqsave(&res_lock, flags); | |
968 | ||
969 | ch = id_to_chan(id); | |
970 | ||
971 | if (!ch || chan_free(ch)) { | |
972 | ret = -EINVAL; | |
973 | goto devcfg_exit; | |
974 | } | |
975 | ||
976 | switch (source) { | |
977 | case S3C2410_DMASRC_HW: /* P->M */ | |
978 | ch->req[0].rqtype = DEVTOMEM; | |
979 | ch->req[1].rqtype = DEVTOMEM; | |
980 | ch->rqcfg.src_inc = 0; | |
981 | ch->rqcfg.dst_inc = 1; | |
982 | break; | |
983 | case S3C2410_DMASRC_MEM: /* M->P */ | |
984 | ch->req[0].rqtype = MEMTODEV; | |
985 | ch->req[1].rqtype = MEMTODEV; | |
986 | ch->rqcfg.src_inc = 1; | |
987 | ch->rqcfg.dst_inc = 0; | |
988 | break; | |
989 | default: | |
990 | ret = -EINVAL; | |
991 | goto devcfg_exit; | |
992 | } | |
993 | ||
994 | ch->sdaddr = address; | |
995 | ||
996 | devcfg_exit: | |
997 | spin_unlock_irqrestore(&res_lock, flags); | |
998 | ||
999 | return ret; | |
1000 | } | |
1001 | EXPORT_SYMBOL(s3c2410_dma_devconfig); | |
1002 | ||
1003 | int s3c2410_dma_getposition(enum dma_ch id, dma_addr_t *src, dma_addr_t *dst) | |
1004 | { | |
1005 | struct s3c_pl330_chan *ch = id_to_chan(id); | |
1006 | struct pl330_chanstatus status; | |
1007 | int ret; | |
1008 | ||
1009 | if (!ch || chan_free(ch)) | |
1010 | return -EINVAL; | |
1011 | ||
1012 | ret = pl330_chan_status(ch->pl330_chan_id, &status); | |
1013 | if (ret < 0) | |
1014 | return ret; | |
1015 | ||
1016 | *src = status.src_addr; | |
1017 | *dst = status.dst_addr; | |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | EXPORT_SYMBOL(s3c2410_dma_getposition); | |
1022 | ||
1023 | static irqreturn_t pl330_irq_handler(int irq, void *data) | |
1024 | { | |
1025 | if (pl330_update(data)) | |
1026 | return IRQ_HANDLED; | |
1027 | else | |
1028 | return IRQ_NONE; | |
1029 | } | |
1030 | ||
1031 | static int pl330_probe(struct platform_device *pdev) | |
1032 | { | |
1033 | struct s3c_pl330_dmac *s3c_pl330_dmac; | |
1034 | struct s3c_pl330_platdata *pl330pd; | |
1035 | struct pl330_info *pl330_info; | |
1036 | struct resource *res; | |
1037 | int i, ret, irq; | |
1038 | ||
1039 | pl330pd = pdev->dev.platform_data; | |
1040 | ||
1041 | /* Can't do without the list of _32_ peripherals */ | |
1042 | if (!pl330pd || !pl330pd->peri) { | |
1043 | dev_err(&pdev->dev, "platform data missing!\n"); | |
1044 | return -ENODEV; | |
1045 | } | |
1046 | ||
1047 | pl330_info = kzalloc(sizeof(*pl330_info), GFP_KERNEL); | |
1048 | if (!pl330_info) | |
1049 | return -ENOMEM; | |
1050 | ||
1051 | pl330_info->pl330_data = NULL; | |
1052 | pl330_info->dev = &pdev->dev; | |
1053 | ||
1054 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1055 | if (!res) { | |
1056 | ret = -ENODEV; | |
1057 | goto probe_err1; | |
1058 | } | |
1059 | ||
1060 | request_mem_region(res->start, resource_size(res), pdev->name); | |
1061 | ||
1062 | pl330_info->base = ioremap(res->start, resource_size(res)); | |
1063 | if (!pl330_info->base) { | |
1064 | ret = -ENXIO; | |
1065 | goto probe_err2; | |
1066 | } | |
1067 | ||
1068 | irq = platform_get_irq(pdev, 0); | |
1069 | if (irq < 0) { | |
1070 | ret = irq; | |
1071 | goto probe_err3; | |
1072 | } | |
1073 | ||
1074 | ret = request_irq(irq, pl330_irq_handler, 0, | |
1075 | dev_name(&pdev->dev), pl330_info); | |
1076 | if (ret) | |
1077 | goto probe_err4; | |
1078 | ||
d800edeb JB |
1079 | /* Allocate a new DMAC */ |
1080 | s3c_pl330_dmac = kmalloc(sizeof(*s3c_pl330_dmac), GFP_KERNEL); | |
1081 | if (!s3c_pl330_dmac) { | |
1082 | ret = -ENOMEM; | |
6c69abb2 SY |
1083 | goto probe_err5; |
1084 | } | |
1085 | ||
1086 | /* Get operation clock and enable it */ | |
1087 | s3c_pl330_dmac->clk = clk_get(&pdev->dev, "pdma"); | |
1088 | if (IS_ERR(s3c_pl330_dmac->clk)) { | |
1089 | dev_err(&pdev->dev, "Cannot get operation clock.\n"); | |
1090 | ret = -EINVAL; | |
d800edeb JB |
1091 | goto probe_err6; |
1092 | } | |
6c69abb2 SY |
1093 | clk_enable(s3c_pl330_dmac->clk); |
1094 | ||
1095 | ret = pl330_add(pl330_info); | |
1096 | if (ret) | |
1097 | goto probe_err7; | |
d800edeb JB |
1098 | |
1099 | /* Hook the info */ | |
1100 | s3c_pl330_dmac->pi = pl330_info; | |
1101 | ||
1102 | /* No busy channels */ | |
1103 | s3c_pl330_dmac->busy_chan = 0; | |
1104 | ||
1105 | s3c_pl330_dmac->kmcache = kmem_cache_create(dev_name(&pdev->dev), | |
1106 | sizeof(struct s3c_pl330_xfer), 0, 0, NULL); | |
1107 | ||
1108 | if (!s3c_pl330_dmac->kmcache) { | |
1109 | ret = -ENOMEM; | |
6c69abb2 | 1110 | goto probe_err8; |
d800edeb JB |
1111 | } |
1112 | ||
1113 | /* Get the list of peripherals */ | |
1114 | s3c_pl330_dmac->peri = pl330pd->peri; | |
1115 | ||
1116 | /* Attach to the list of DMACs */ | |
1117 | list_add_tail(&s3c_pl330_dmac->node, &dmac_list); | |
1118 | ||
1119 | /* Create a channel for each peripheral in the DMAC | |
1120 | * that is, if it doesn't already exist | |
1121 | */ | |
1122 | for (i = 0; i < PL330_MAX_PERI; i++) | |
1123 | if (s3c_pl330_dmac->peri[i] != DMACH_MAX) | |
1124 | chan_add(s3c_pl330_dmac->peri[i]); | |
1125 | ||
1126 | printk(KERN_INFO | |
1127 | "Loaded driver for PL330 DMAC-%d %s\n", pdev->id, pdev->name); | |
1128 | printk(KERN_INFO | |
1129 | "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n", | |
1130 | pl330_info->pcfg.data_buf_dep, | |
1131 | pl330_info->pcfg.data_bus_width / 8, pl330_info->pcfg.num_chan, | |
1132 | pl330_info->pcfg.num_peri, pl330_info->pcfg.num_events); | |
1133 | ||
1134 | return 0; | |
1135 | ||
6c69abb2 SY |
1136 | probe_err8: |
1137 | pl330_del(pl330_info); | |
d800edeb | 1138 | probe_err7: |
6c69abb2 SY |
1139 | clk_disable(s3c_pl330_dmac->clk); |
1140 | clk_put(s3c_pl330_dmac->clk); | |
d800edeb | 1141 | probe_err6: |
6c69abb2 | 1142 | kfree(s3c_pl330_dmac); |
d800edeb JB |
1143 | probe_err5: |
1144 | free_irq(irq, pl330_info); | |
1145 | probe_err4: | |
1146 | probe_err3: | |
1147 | iounmap(pl330_info->base); | |
1148 | probe_err2: | |
1149 | release_mem_region(res->start, resource_size(res)); | |
1150 | probe_err1: | |
1151 | kfree(pl330_info); | |
1152 | ||
1153 | return ret; | |
1154 | } | |
1155 | ||
1156 | static int pl330_remove(struct platform_device *pdev) | |
1157 | { | |
1158 | struct s3c_pl330_dmac *dmac, *d; | |
1159 | struct s3c_pl330_chan *ch; | |
1160 | unsigned long flags; | |
1161 | int del, found; | |
1162 | ||
1163 | if (!pdev->dev.platform_data) | |
1164 | return -EINVAL; | |
1165 | ||
1166 | spin_lock_irqsave(&res_lock, flags); | |
1167 | ||
1168 | found = 0; | |
1169 | list_for_each_entry(d, &dmac_list, node) | |
1170 | if (d->pi->dev == &pdev->dev) { | |
1171 | found = 1; | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | if (!found) { | |
1176 | spin_unlock_irqrestore(&res_lock, flags); | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | dmac = d; | |
1181 | ||
1182 | /* Remove all Channels that are managed only by this DMAC */ | |
1183 | list_for_each_entry(ch, &chan_list, node) { | |
1184 | ||
1185 | /* Only channels that are handled by this DMAC */ | |
1186 | if (iface_of_dmac(dmac, ch->id)) | |
1187 | del = 1; | |
1188 | else | |
1189 | continue; | |
1190 | ||
1191 | /* Don't remove if some other DMAC has it too */ | |
1192 | list_for_each_entry(d, &dmac_list, node) | |
1193 | if (d != dmac && iface_of_dmac(d, ch->id)) { | |
1194 | del = 0; | |
1195 | break; | |
1196 | } | |
1197 | ||
1198 | if (del) { | |
1199 | spin_unlock_irqrestore(&res_lock, flags); | |
1200 | s3c2410_dma_free(ch->id, ch->client); | |
1201 | spin_lock_irqsave(&res_lock, flags); | |
1202 | list_del(&ch->node); | |
1203 | kfree(ch); | |
1204 | } | |
1205 | } | |
1206 | ||
6c69abb2 SY |
1207 | /* Disable operation clock */ |
1208 | clk_disable(dmac->clk); | |
1209 | clk_put(dmac->clk); | |
1210 | ||
d800edeb JB |
1211 | /* Remove the DMAC */ |
1212 | list_del(&dmac->node); | |
1213 | kfree(dmac); | |
1214 | ||
1215 | spin_unlock_irqrestore(&res_lock, flags); | |
1216 | ||
1217 | return 0; | |
1218 | } | |
1219 | ||
1220 | static struct platform_driver pl330_driver = { | |
1221 | .driver = { | |
1222 | .owner = THIS_MODULE, | |
1223 | .name = "s3c-pl330", | |
1224 | }, | |
1225 | .probe = pl330_probe, | |
1226 | .remove = pl330_remove, | |
1227 | }; | |
1228 | ||
1229 | static int __init pl330_init(void) | |
1230 | { | |
1231 | return platform_driver_register(&pl330_driver); | |
1232 | } | |
1233 | module_init(pl330_init); | |
1234 | ||
1235 | static void __exit pl330_exit(void) | |
1236 | { | |
1237 | platform_driver_unregister(&pl330_driver); | |
1238 | return; | |
1239 | } | |
1240 | module_exit(pl330_exit); | |
1241 | ||
1242 | MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>"); | |
1243 | MODULE_DESCRIPTION("Driver for PL330 DMA Controller"); | |
1244 | MODULE_LICENSE("GPL"); |