xref: /openbmc/linux/drivers/dma/mpc512x_dma.c (revision 7490ca1e)
1 /*
2  * Copyright (C) Freescale Semicondutor, Inc. 2007, 2008.
3  * Copyright (C) Semihalf 2009
4  * Copyright (C) Ilya Yanok, Emcraft Systems 2010
5  *
6  * Written by Piotr Ziecik <kosmo@semihalf.com>. Hardware description
7  * (defines, structures and comments) was taken from MPC5121 DMA driver
8  * written by Hongjun Chen <hong-jun.chen@freescale.com>.
9  *
10  * Approved as OSADL project by a majority of OSADL members and funded
11  * by OSADL membership fees in 2009;  for details see www.osadl.org.
12  *
13  * This program is free software; you can redistribute it and/or modify it
14  * under the terms of the GNU General Public License as published by the Free
15  * Software Foundation; either version 2 of the License, or (at your option)
16  * any later version.
17  *
18  * This program is distributed in the hope that it will be useful, but WITHOUT
19  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
20  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
21  * more details.
22  *
23  * You should have received a copy of the GNU General Public License along with
24  * this program; if not, write to the Free Software Foundation, Inc., 59
25  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
26  *
27  * The full GNU General Public License is included in this distribution in the
28  * file called COPYING.
29  */
30 
31 /*
32  * This is initial version of MPC5121 DMA driver. Only memory to memory
33  * transfers are supported (tested using dmatest module).
34  */
35 
36 #include <linux/module.h>
37 #include <linux/dmaengine.h>
38 #include <linux/dma-mapping.h>
39 #include <linux/interrupt.h>
40 #include <linux/io.h>
41 #include <linux/slab.h>
42 #include <linux/of_device.h>
43 #include <linux/of_platform.h>
44 
45 #include <linux/random.h>
46 
47 /* Number of DMA Transfer descriptors allocated per channel */
48 #define MPC_DMA_DESCRIPTORS	64
49 
50 /* Macro definitions */
51 #define MPC_DMA_CHANNELS	64
52 #define MPC_DMA_TCD_OFFSET	0x1000
53 
54 /* Arbitration mode of group and channel */
55 #define MPC_DMA_DMACR_EDCG	(1 << 31)
56 #define MPC_DMA_DMACR_ERGA	(1 << 3)
57 #define MPC_DMA_DMACR_ERCA	(1 << 2)
58 
59 /* Error codes */
60 #define MPC_DMA_DMAES_VLD	(1 << 31)
61 #define MPC_DMA_DMAES_GPE	(1 << 15)
62 #define MPC_DMA_DMAES_CPE	(1 << 14)
63 #define MPC_DMA_DMAES_ERRCHN(err) \
64 				(((err) >> 8) & 0x3f)
65 #define MPC_DMA_DMAES_SAE	(1 << 7)
66 #define MPC_DMA_DMAES_SOE	(1 << 6)
67 #define MPC_DMA_DMAES_DAE	(1 << 5)
68 #define MPC_DMA_DMAES_DOE	(1 << 4)
69 #define MPC_DMA_DMAES_NCE	(1 << 3)
70 #define MPC_DMA_DMAES_SGE	(1 << 2)
71 #define MPC_DMA_DMAES_SBE	(1 << 1)
72 #define MPC_DMA_DMAES_DBE	(1 << 0)
73 
74 #define MPC_DMA_DMAGPOR_SNOOP_ENABLE	(1 << 6)
75 
76 #define MPC_DMA_TSIZE_1		0x00
77 #define MPC_DMA_TSIZE_2		0x01
78 #define MPC_DMA_TSIZE_4		0x02
79 #define MPC_DMA_TSIZE_16	0x04
80 #define MPC_DMA_TSIZE_32	0x05
81 
82 /* MPC5121 DMA engine registers */
83 struct __attribute__ ((__packed__)) mpc_dma_regs {
84 	/* 0x00 */
85 	u32 dmacr;		/* DMA control register */
86 	u32 dmaes;		/* DMA error status */
87 	/* 0x08 */
88 	u32 dmaerqh;		/* DMA enable request high(channels 63~32) */
89 	u32 dmaerql;		/* DMA enable request low(channels 31~0) */
90 	u32 dmaeeih;		/* DMA enable error interrupt high(ch63~32) */
91 	u32 dmaeeil;		/* DMA enable error interrupt low(ch31~0) */
92 	/* 0x18 */
93 	u8 dmaserq;		/* DMA set enable request */
94 	u8 dmacerq;		/* DMA clear enable request */
95 	u8 dmaseei;		/* DMA set enable error interrupt */
96 	u8 dmaceei;		/* DMA clear enable error interrupt */
97 	/* 0x1c */
98 	u8 dmacint;		/* DMA clear interrupt request */
99 	u8 dmacerr;		/* DMA clear error */
100 	u8 dmassrt;		/* DMA set start bit */
101 	u8 dmacdne;		/* DMA clear DONE status bit */
102 	/* 0x20 */
103 	u32 dmainth;		/* DMA interrupt request high(ch63~32) */
104 	u32 dmaintl;		/* DMA interrupt request low(ch31~0) */
105 	u32 dmaerrh;		/* DMA error high(ch63~32) */
106 	u32 dmaerrl;		/* DMA error low(ch31~0) */
107 	/* 0x30 */
108 	u32 dmahrsh;		/* DMA hw request status high(ch63~32) */
109 	u32 dmahrsl;		/* DMA hardware request status low(ch31~0) */
110 	union {
111 		u32 dmaihsa;	/* DMA interrupt high select AXE(ch63~32) */
112 		u32 dmagpor;	/* (General purpose register on MPC8308) */
113 	};
114 	u32 dmailsa;		/* DMA interrupt low select AXE(ch31~0) */
115 	/* 0x40 ~ 0xff */
116 	u32 reserve0[48];	/* Reserved */
117 	/* 0x100 */
118 	u8 dchpri[MPC_DMA_CHANNELS];
119 	/* DMA channels(0~63) priority */
120 };
121 
122 struct __attribute__ ((__packed__)) mpc_dma_tcd {
123 	/* 0x00 */
124 	u32 saddr;		/* Source address */
125 
126 	u32 smod:5;		/* Source address modulo */
127 	u32 ssize:3;		/* Source data transfer size */
128 	u32 dmod:5;		/* Destination address modulo */
129 	u32 dsize:3;		/* Destination data transfer size */
130 	u32 soff:16;		/* Signed source address offset */
131 
132 	/* 0x08 */
133 	u32 nbytes;		/* Inner "minor" byte count */
134 	u32 slast;		/* Last source address adjustment */
135 	u32 daddr;		/* Destination address */
136 
137 	/* 0x14 */
138 	u32 citer_elink:1;	/* Enable channel-to-channel linking on
139 				 * minor loop complete
140 				 */
141 	u32 citer_linkch:6;	/* Link channel for minor loop complete */
142 	u32 citer:9;		/* Current "major" iteration count */
143 	u32 doff:16;		/* Signed destination address offset */
144 
145 	/* 0x18 */
146 	u32 dlast_sga;		/* Last Destination address adjustment/scatter
147 				 * gather address
148 				 */
149 
150 	/* 0x1c */
151 	u32 biter_elink:1;	/* Enable channel-to-channel linking on major
152 				 * loop complete
153 				 */
154 	u32 biter_linkch:6;
155 	u32 biter:9;		/* Beginning "major" iteration count */
156 	u32 bwc:2;		/* Bandwidth control */
157 	u32 major_linkch:6;	/* Link channel number */
158 	u32 done:1;		/* Channel done */
159 	u32 active:1;		/* Channel active */
160 	u32 major_elink:1;	/* Enable channel-to-channel linking on major
161 				 * loop complete
162 				 */
163 	u32 e_sg:1;		/* Enable scatter/gather processing */
164 	u32 d_req:1;		/* Disable request */
165 	u32 int_half:1;		/* Enable an interrupt when major counter is
166 				 * half complete
167 				 */
168 	u32 int_maj:1;		/* Enable an interrupt when major iteration
169 				 * count completes
170 				 */
171 	u32 start:1;		/* Channel start */
172 };
173 
174 struct mpc_dma_desc {
175 	struct dma_async_tx_descriptor	desc;
176 	struct mpc_dma_tcd		*tcd;
177 	dma_addr_t			tcd_paddr;
178 	int				error;
179 	struct list_head		node;
180 };
181 
182 struct mpc_dma_chan {
183 	struct dma_chan			chan;
184 	struct list_head		free;
185 	struct list_head		prepared;
186 	struct list_head		queued;
187 	struct list_head		active;
188 	struct list_head		completed;
189 	struct mpc_dma_tcd		*tcd;
190 	dma_addr_t			tcd_paddr;
191 	dma_cookie_t			completed_cookie;
192 
193 	/* Lock for this structure */
194 	spinlock_t			lock;
195 };
196 
197 struct mpc_dma {
198 	struct dma_device		dma;
199 	struct tasklet_struct		tasklet;
200 	struct mpc_dma_chan		channels[MPC_DMA_CHANNELS];
201 	struct mpc_dma_regs __iomem	*regs;
202 	struct mpc_dma_tcd __iomem	*tcd;
203 	int				irq;
204 	int				irq2;
205 	uint				error_status;
206 	int				is_mpc8308;
207 
208 	/* Lock for error_status field in this structure */
209 	spinlock_t			error_status_lock;
210 };
211 
212 #define DRV_NAME	"mpc512x_dma"
213 
214 /* Convert struct dma_chan to struct mpc_dma_chan */
215 static inline struct mpc_dma_chan *dma_chan_to_mpc_dma_chan(struct dma_chan *c)
216 {
217 	return container_of(c, struct mpc_dma_chan, chan);
218 }
219 
220 /* Convert struct dma_chan to struct mpc_dma */
221 static inline struct mpc_dma *dma_chan_to_mpc_dma(struct dma_chan *c)
222 {
223 	struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(c);
224 	return container_of(mchan, struct mpc_dma, channels[c->chan_id]);
225 }
226 
227 /*
228  * Execute all queued DMA descriptors.
229  *
230  * Following requirements must be met while calling mpc_dma_execute():
231  * 	a) mchan->lock is acquired,
232  * 	b) mchan->active list is empty,
233  * 	c) mchan->queued list contains at least one entry.
234  */
235 static void mpc_dma_execute(struct mpc_dma_chan *mchan)
236 {
237 	struct mpc_dma *mdma = dma_chan_to_mpc_dma(&mchan->chan);
238 	struct mpc_dma_desc *first = NULL;
239 	struct mpc_dma_desc *prev = NULL;
240 	struct mpc_dma_desc *mdesc;
241 	int cid = mchan->chan.chan_id;
242 
243 	/* Move all queued descriptors to active list */
244 	list_splice_tail_init(&mchan->queued, &mchan->active);
245 
246 	/* Chain descriptors into one transaction */
247 	list_for_each_entry(mdesc, &mchan->active, node) {
248 		if (!first)
249 			first = mdesc;
250 
251 		if (!prev) {
252 			prev = mdesc;
253 			continue;
254 		}
255 
256 		prev->tcd->dlast_sga = mdesc->tcd_paddr;
257 		prev->tcd->e_sg = 1;
258 		mdesc->tcd->start = 1;
259 
260 		prev = mdesc;
261 	}
262 
263 	prev->tcd->int_maj = 1;
264 
265 	/* Send first descriptor in chain into hardware */
266 	memcpy_toio(&mdma->tcd[cid], first->tcd, sizeof(struct mpc_dma_tcd));
267 
268 	if (first != prev)
269 		mdma->tcd[cid].e_sg = 1;
270 	out_8(&mdma->regs->dmassrt, cid);
271 }
272 
273 /* Handle interrupt on one half of DMA controller (32 channels) */
274 static void mpc_dma_irq_process(struct mpc_dma *mdma, u32 is, u32 es, int off)
275 {
276 	struct mpc_dma_chan *mchan;
277 	struct mpc_dma_desc *mdesc;
278 	u32 status = is | es;
279 	int ch;
280 
281 	while ((ch = fls(status) - 1) >= 0) {
282 		status &= ~(1 << ch);
283 		mchan = &mdma->channels[ch + off];
284 
285 		spin_lock(&mchan->lock);
286 
287 		out_8(&mdma->regs->dmacint, ch + off);
288 		out_8(&mdma->regs->dmacerr, ch + off);
289 
290 		/* Check error status */
291 		if (es & (1 << ch))
292 			list_for_each_entry(mdesc, &mchan->active, node)
293 				mdesc->error = -EIO;
294 
295 		/* Execute queued descriptors */
296 		list_splice_tail_init(&mchan->active, &mchan->completed);
297 		if (!list_empty(&mchan->queued))
298 			mpc_dma_execute(mchan);
299 
300 		spin_unlock(&mchan->lock);
301 	}
302 }
303 
304 /* Interrupt handler */
305 static irqreturn_t mpc_dma_irq(int irq, void *data)
306 {
307 	struct mpc_dma *mdma = data;
308 	uint es;
309 
310 	/* Save error status register */
311 	es = in_be32(&mdma->regs->dmaes);
312 	spin_lock(&mdma->error_status_lock);
313 	if ((es & MPC_DMA_DMAES_VLD) && mdma->error_status == 0)
314 		mdma->error_status = es;
315 	spin_unlock(&mdma->error_status_lock);
316 
317 	/* Handle interrupt on each channel */
318 	if (mdma->dma.chancnt > 32) {
319 		mpc_dma_irq_process(mdma, in_be32(&mdma->regs->dmainth),
320 					in_be32(&mdma->regs->dmaerrh), 32);
321 	}
322 	mpc_dma_irq_process(mdma, in_be32(&mdma->regs->dmaintl),
323 					in_be32(&mdma->regs->dmaerrl), 0);
324 
325 	/* Schedule tasklet */
326 	tasklet_schedule(&mdma->tasklet);
327 
328 	return IRQ_HANDLED;
329 }
330 
331 /* process completed descriptors */
332 static void mpc_dma_process_completed(struct mpc_dma *mdma)
333 {
334 	dma_cookie_t last_cookie = 0;
335 	struct mpc_dma_chan *mchan;
336 	struct mpc_dma_desc *mdesc;
337 	struct dma_async_tx_descriptor *desc;
338 	unsigned long flags;
339 	LIST_HEAD(list);
340 	int i;
341 
342 	for (i = 0; i < mdma->dma.chancnt; i++) {
343 		mchan = &mdma->channels[i];
344 
345 		/* Get all completed descriptors */
346 		spin_lock_irqsave(&mchan->lock, flags);
347 		if (!list_empty(&mchan->completed))
348 			list_splice_tail_init(&mchan->completed, &list);
349 		spin_unlock_irqrestore(&mchan->lock, flags);
350 
351 		if (list_empty(&list))
352 			continue;
353 
354 		/* Execute callbacks and run dependencies */
355 		list_for_each_entry(mdesc, &list, node) {
356 			desc = &mdesc->desc;
357 
358 			if (desc->callback)
359 				desc->callback(desc->callback_param);
360 
361 			last_cookie = desc->cookie;
362 			dma_run_dependencies(desc);
363 		}
364 
365 		/* Free descriptors */
366 		spin_lock_irqsave(&mchan->lock, flags);
367 		list_splice_tail_init(&list, &mchan->free);
368 		mchan->completed_cookie = last_cookie;
369 		spin_unlock_irqrestore(&mchan->lock, flags);
370 	}
371 }
372 
373 /* DMA Tasklet */
374 static void mpc_dma_tasklet(unsigned long data)
375 {
376 	struct mpc_dma *mdma = (void *)data;
377 	unsigned long flags;
378 	uint es;
379 
380 	spin_lock_irqsave(&mdma->error_status_lock, flags);
381 	es = mdma->error_status;
382 	mdma->error_status = 0;
383 	spin_unlock_irqrestore(&mdma->error_status_lock, flags);
384 
385 	/* Print nice error report */
386 	if (es) {
387 		dev_err(mdma->dma.dev,
388 			"Hardware reported following error(s) on channel %u:\n",
389 						      MPC_DMA_DMAES_ERRCHN(es));
390 
391 		if (es & MPC_DMA_DMAES_GPE)
392 			dev_err(mdma->dma.dev, "- Group Priority Error\n");
393 		if (es & MPC_DMA_DMAES_CPE)
394 			dev_err(mdma->dma.dev, "- Channel Priority Error\n");
395 		if (es & MPC_DMA_DMAES_SAE)
396 			dev_err(mdma->dma.dev, "- Source Address Error\n");
397 		if (es & MPC_DMA_DMAES_SOE)
398 			dev_err(mdma->dma.dev, "- Source Offset"
399 						" Configuration Error\n");
400 		if (es & MPC_DMA_DMAES_DAE)
401 			dev_err(mdma->dma.dev, "- Destination Address"
402 								" Error\n");
403 		if (es & MPC_DMA_DMAES_DOE)
404 			dev_err(mdma->dma.dev, "- Destination Offset"
405 						" Configuration Error\n");
406 		if (es & MPC_DMA_DMAES_NCE)
407 			dev_err(mdma->dma.dev, "- NBytes/Citter"
408 						" Configuration Error\n");
409 		if (es & MPC_DMA_DMAES_SGE)
410 			dev_err(mdma->dma.dev, "- Scatter/Gather"
411 						" Configuration Error\n");
412 		if (es & MPC_DMA_DMAES_SBE)
413 			dev_err(mdma->dma.dev, "- Source Bus Error\n");
414 		if (es & MPC_DMA_DMAES_DBE)
415 			dev_err(mdma->dma.dev, "- Destination Bus Error\n");
416 	}
417 
418 	mpc_dma_process_completed(mdma);
419 }
420 
421 /* Submit descriptor to hardware */
422 static dma_cookie_t mpc_dma_tx_submit(struct dma_async_tx_descriptor *txd)
423 {
424 	struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(txd->chan);
425 	struct mpc_dma_desc *mdesc;
426 	unsigned long flags;
427 	dma_cookie_t cookie;
428 
429 	mdesc = container_of(txd, struct mpc_dma_desc, desc);
430 
431 	spin_lock_irqsave(&mchan->lock, flags);
432 
433 	/* Move descriptor to queue */
434 	list_move_tail(&mdesc->node, &mchan->queued);
435 
436 	/* If channel is idle, execute all queued descriptors */
437 	if (list_empty(&mchan->active))
438 		mpc_dma_execute(mchan);
439 
440 	/* Update cookie */
441 	cookie = mchan->chan.cookie + 1;
442 	if (cookie <= 0)
443 		cookie = 1;
444 
445 	mchan->chan.cookie = cookie;
446 	mdesc->desc.cookie = cookie;
447 
448 	spin_unlock_irqrestore(&mchan->lock, flags);
449 
450 	return cookie;
451 }
452 
453 /* Alloc channel resources */
454 static int mpc_dma_alloc_chan_resources(struct dma_chan *chan)
455 {
456 	struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan);
457 	struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
458 	struct mpc_dma_desc *mdesc;
459 	struct mpc_dma_tcd *tcd;
460 	dma_addr_t tcd_paddr;
461 	unsigned long flags;
462 	LIST_HEAD(descs);
463 	int i;
464 
465 	/* Alloc DMA memory for Transfer Control Descriptors */
466 	tcd = dma_alloc_coherent(mdma->dma.dev,
467 			MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd),
468 							&tcd_paddr, GFP_KERNEL);
469 	if (!tcd)
470 		return -ENOMEM;
471 
472 	/* Alloc descriptors for this channel */
473 	for (i = 0; i < MPC_DMA_DESCRIPTORS; i++) {
474 		mdesc = kzalloc(sizeof(struct mpc_dma_desc), GFP_KERNEL);
475 		if (!mdesc) {
476 			dev_notice(mdma->dma.dev, "Memory allocation error. "
477 					"Allocated only %u descriptors\n", i);
478 			break;
479 		}
480 
481 		dma_async_tx_descriptor_init(&mdesc->desc, chan);
482 		mdesc->desc.flags = DMA_CTRL_ACK;
483 		mdesc->desc.tx_submit = mpc_dma_tx_submit;
484 
485 		mdesc->tcd = &tcd[i];
486 		mdesc->tcd_paddr = tcd_paddr + (i * sizeof(struct mpc_dma_tcd));
487 
488 		list_add_tail(&mdesc->node, &descs);
489 	}
490 
491 	/* Return error only if no descriptors were allocated */
492 	if (i == 0) {
493 		dma_free_coherent(mdma->dma.dev,
494 			MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd),
495 								tcd, tcd_paddr);
496 		return -ENOMEM;
497 	}
498 
499 	spin_lock_irqsave(&mchan->lock, flags);
500 	mchan->tcd = tcd;
501 	mchan->tcd_paddr = tcd_paddr;
502 	list_splice_tail_init(&descs, &mchan->free);
503 	spin_unlock_irqrestore(&mchan->lock, flags);
504 
505 	/* Enable Error Interrupt */
506 	out_8(&mdma->regs->dmaseei, chan->chan_id);
507 
508 	return 0;
509 }
510 
511 /* Free channel resources */
512 static void mpc_dma_free_chan_resources(struct dma_chan *chan)
513 {
514 	struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan);
515 	struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
516 	struct mpc_dma_desc *mdesc, *tmp;
517 	struct mpc_dma_tcd *tcd;
518 	dma_addr_t tcd_paddr;
519 	unsigned long flags;
520 	LIST_HEAD(descs);
521 
522 	spin_lock_irqsave(&mchan->lock, flags);
523 
524 	/* Channel must be idle */
525 	BUG_ON(!list_empty(&mchan->prepared));
526 	BUG_ON(!list_empty(&mchan->queued));
527 	BUG_ON(!list_empty(&mchan->active));
528 	BUG_ON(!list_empty(&mchan->completed));
529 
530 	/* Move data */
531 	list_splice_tail_init(&mchan->free, &descs);
532 	tcd = mchan->tcd;
533 	tcd_paddr = mchan->tcd_paddr;
534 
535 	spin_unlock_irqrestore(&mchan->lock, flags);
536 
537 	/* Free DMA memory used by descriptors */
538 	dma_free_coherent(mdma->dma.dev,
539 			MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd),
540 								tcd, tcd_paddr);
541 
542 	/* Free descriptors */
543 	list_for_each_entry_safe(mdesc, tmp, &descs, node)
544 		kfree(mdesc);
545 
546 	/* Disable Error Interrupt */
547 	out_8(&mdma->regs->dmaceei, chan->chan_id);
548 }
549 
550 /* Send all pending descriptor to hardware */
551 static void mpc_dma_issue_pending(struct dma_chan *chan)
552 {
553 	/*
554 	 * We are posting descriptors to the hardware as soon as
555 	 * they are ready, so this function does nothing.
556 	 */
557 }
558 
559 /* Check request completion status */
560 static enum dma_status
561 mpc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
562 	       struct dma_tx_state *txstate)
563 {
564 	struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
565 	unsigned long flags;
566 	dma_cookie_t last_used;
567 	dma_cookie_t last_complete;
568 
569 	spin_lock_irqsave(&mchan->lock, flags);
570 	last_used = mchan->chan.cookie;
571 	last_complete = mchan->completed_cookie;
572 	spin_unlock_irqrestore(&mchan->lock, flags);
573 
574 	dma_set_tx_state(txstate, last_complete, last_used, 0);
575 	return dma_async_is_complete(cookie, last_complete, last_used);
576 }
577 
578 /* Prepare descriptor for memory to memory copy */
579 static struct dma_async_tx_descriptor *
580 mpc_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
581 					size_t len, unsigned long flags)
582 {
583 	struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan);
584 	struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
585 	struct mpc_dma_desc *mdesc = NULL;
586 	struct mpc_dma_tcd *tcd;
587 	unsigned long iflags;
588 
589 	/* Get free descriptor */
590 	spin_lock_irqsave(&mchan->lock, iflags);
591 	if (!list_empty(&mchan->free)) {
592 		mdesc = list_first_entry(&mchan->free, struct mpc_dma_desc,
593 									node);
594 		list_del(&mdesc->node);
595 	}
596 	spin_unlock_irqrestore(&mchan->lock, iflags);
597 
598 	if (!mdesc) {
599 		/* try to free completed descriptors */
600 		mpc_dma_process_completed(mdma);
601 		return NULL;
602 	}
603 
604 	mdesc->error = 0;
605 	tcd = mdesc->tcd;
606 
607 	/* Prepare Transfer Control Descriptor for this transaction */
608 	memset(tcd, 0, sizeof(struct mpc_dma_tcd));
609 
610 	if (IS_ALIGNED(src | dst | len, 32)) {
611 		tcd->ssize = MPC_DMA_TSIZE_32;
612 		tcd->dsize = MPC_DMA_TSIZE_32;
613 		tcd->soff = 32;
614 		tcd->doff = 32;
615 	} else if (!mdma->is_mpc8308 && IS_ALIGNED(src | dst | len, 16)) {
616 		/* MPC8308 doesn't support 16 byte transfers */
617 		tcd->ssize = MPC_DMA_TSIZE_16;
618 		tcd->dsize = MPC_DMA_TSIZE_16;
619 		tcd->soff = 16;
620 		tcd->doff = 16;
621 	} else if (IS_ALIGNED(src | dst | len, 4)) {
622 		tcd->ssize = MPC_DMA_TSIZE_4;
623 		tcd->dsize = MPC_DMA_TSIZE_4;
624 		tcd->soff = 4;
625 		tcd->doff = 4;
626 	} else if (IS_ALIGNED(src | dst | len, 2)) {
627 		tcd->ssize = MPC_DMA_TSIZE_2;
628 		tcd->dsize = MPC_DMA_TSIZE_2;
629 		tcd->soff = 2;
630 		tcd->doff = 2;
631 	} else {
632 		tcd->ssize = MPC_DMA_TSIZE_1;
633 		tcd->dsize = MPC_DMA_TSIZE_1;
634 		tcd->soff = 1;
635 		tcd->doff = 1;
636 	}
637 
638 	tcd->saddr = src;
639 	tcd->daddr = dst;
640 	tcd->nbytes = len;
641 	tcd->biter = 1;
642 	tcd->citer = 1;
643 
644 	/* Place descriptor in prepared list */
645 	spin_lock_irqsave(&mchan->lock, iflags);
646 	list_add_tail(&mdesc->node, &mchan->prepared);
647 	spin_unlock_irqrestore(&mchan->lock, iflags);
648 
649 	return &mdesc->desc;
650 }
651 
652 static int __devinit mpc_dma_probe(struct platform_device *op)
653 {
654 	struct device_node *dn = op->dev.of_node;
655 	struct device *dev = &op->dev;
656 	struct dma_device *dma;
657 	struct mpc_dma *mdma;
658 	struct mpc_dma_chan *mchan;
659 	struct resource res;
660 	ulong regs_start, regs_size;
661 	int retval, i;
662 
663 	mdma = devm_kzalloc(dev, sizeof(struct mpc_dma), GFP_KERNEL);
664 	if (!mdma) {
665 		dev_err(dev, "Memory exhausted!\n");
666 		return -ENOMEM;
667 	}
668 
669 	mdma->irq = irq_of_parse_and_map(dn, 0);
670 	if (mdma->irq == NO_IRQ) {
671 		dev_err(dev, "Error mapping IRQ!\n");
672 		return -EINVAL;
673 	}
674 
675 	if (of_device_is_compatible(dn, "fsl,mpc8308-dma")) {
676 		mdma->is_mpc8308 = 1;
677 		mdma->irq2 = irq_of_parse_and_map(dn, 1);
678 		if (mdma->irq2 == NO_IRQ) {
679 			dev_err(dev, "Error mapping IRQ!\n");
680 			return -EINVAL;
681 		}
682 	}
683 
684 	retval = of_address_to_resource(dn, 0, &res);
685 	if (retval) {
686 		dev_err(dev, "Error parsing memory region!\n");
687 		return retval;
688 	}
689 
690 	regs_start = res.start;
691 	regs_size = resource_size(&res);
692 
693 	if (!devm_request_mem_region(dev, regs_start, regs_size, DRV_NAME)) {
694 		dev_err(dev, "Error requesting memory region!\n");
695 		return -EBUSY;
696 	}
697 
698 	mdma->regs = devm_ioremap(dev, regs_start, regs_size);
699 	if (!mdma->regs) {
700 		dev_err(dev, "Error mapping memory region!\n");
701 		return -ENOMEM;
702 	}
703 
704 	mdma->tcd = (struct mpc_dma_tcd *)((u8 *)(mdma->regs)
705 							+ MPC_DMA_TCD_OFFSET);
706 
707 	retval = devm_request_irq(dev, mdma->irq, &mpc_dma_irq, 0, DRV_NAME,
708 									mdma);
709 	if (retval) {
710 		dev_err(dev, "Error requesting IRQ!\n");
711 		return -EINVAL;
712 	}
713 
714 	if (mdma->is_mpc8308) {
715 		retval = devm_request_irq(dev, mdma->irq2, &mpc_dma_irq, 0,
716 				DRV_NAME, mdma);
717 		if (retval) {
718 			dev_err(dev, "Error requesting IRQ2!\n");
719 			return -EINVAL;
720 		}
721 	}
722 
723 	spin_lock_init(&mdma->error_status_lock);
724 
725 	dma = &mdma->dma;
726 	dma->dev = dev;
727 	if (!mdma->is_mpc8308)
728 		dma->chancnt = MPC_DMA_CHANNELS;
729 	else
730 		dma->chancnt = 16; /* MPC8308 DMA has only 16 channels */
731 	dma->device_alloc_chan_resources = mpc_dma_alloc_chan_resources;
732 	dma->device_free_chan_resources = mpc_dma_free_chan_resources;
733 	dma->device_issue_pending = mpc_dma_issue_pending;
734 	dma->device_tx_status = mpc_dma_tx_status;
735 	dma->device_prep_dma_memcpy = mpc_dma_prep_memcpy;
736 
737 	INIT_LIST_HEAD(&dma->channels);
738 	dma_cap_set(DMA_MEMCPY, dma->cap_mask);
739 
740 	for (i = 0; i < dma->chancnt; i++) {
741 		mchan = &mdma->channels[i];
742 
743 		mchan->chan.device = dma;
744 		mchan->chan.cookie = 1;
745 		mchan->completed_cookie = mchan->chan.cookie;
746 
747 		INIT_LIST_HEAD(&mchan->free);
748 		INIT_LIST_HEAD(&mchan->prepared);
749 		INIT_LIST_HEAD(&mchan->queued);
750 		INIT_LIST_HEAD(&mchan->active);
751 		INIT_LIST_HEAD(&mchan->completed);
752 
753 		spin_lock_init(&mchan->lock);
754 		list_add_tail(&mchan->chan.device_node, &dma->channels);
755 	}
756 
757 	tasklet_init(&mdma->tasklet, mpc_dma_tasklet, (unsigned long)mdma);
758 
759 	/*
760 	 * Configure DMA Engine:
761 	 * - Dynamic clock,
762 	 * - Round-robin group arbitration,
763 	 * - Round-robin channel arbitration.
764 	 */
765 	if (!mdma->is_mpc8308) {
766 		out_be32(&mdma->regs->dmacr, MPC_DMA_DMACR_EDCG |
767 					MPC_DMA_DMACR_ERGA | MPC_DMA_DMACR_ERCA);
768 
769 		/* Disable hardware DMA requests */
770 		out_be32(&mdma->regs->dmaerqh, 0);
771 		out_be32(&mdma->regs->dmaerql, 0);
772 
773 		/* Disable error interrupts */
774 		out_be32(&mdma->regs->dmaeeih, 0);
775 		out_be32(&mdma->regs->dmaeeil, 0);
776 
777 		/* Clear interrupts status */
778 		out_be32(&mdma->regs->dmainth, 0xFFFFFFFF);
779 		out_be32(&mdma->regs->dmaintl, 0xFFFFFFFF);
780 		out_be32(&mdma->regs->dmaerrh, 0xFFFFFFFF);
781 		out_be32(&mdma->regs->dmaerrl, 0xFFFFFFFF);
782 
783 		/* Route interrupts to IPIC */
784 		out_be32(&mdma->regs->dmaihsa, 0);
785 		out_be32(&mdma->regs->dmailsa, 0);
786 	} else {
787 		/* MPC8308 has 16 channels and lacks some registers */
788 		out_be32(&mdma->regs->dmacr, MPC_DMA_DMACR_ERCA);
789 
790 		/* enable snooping */
791 		out_be32(&mdma->regs->dmagpor, MPC_DMA_DMAGPOR_SNOOP_ENABLE);
792 		/* Disable error interrupts */
793 		out_be32(&mdma->regs->dmaeeil, 0);
794 
795 		/* Clear interrupts status */
796 		out_be32(&mdma->regs->dmaintl, 0xFFFF);
797 		out_be32(&mdma->regs->dmaerrl, 0xFFFF);
798 	}
799 
800 	/* Register DMA engine */
801 	dev_set_drvdata(dev, mdma);
802 	retval = dma_async_device_register(dma);
803 	if (retval) {
804 		devm_free_irq(dev, mdma->irq, mdma);
805 		irq_dispose_mapping(mdma->irq);
806 	}
807 
808 	return retval;
809 }
810 
811 static int __devexit mpc_dma_remove(struct platform_device *op)
812 {
813 	struct device *dev = &op->dev;
814 	struct mpc_dma *mdma = dev_get_drvdata(dev);
815 
816 	dma_async_device_unregister(&mdma->dma);
817 	devm_free_irq(dev, mdma->irq, mdma);
818 	irq_dispose_mapping(mdma->irq);
819 
820 	return 0;
821 }
822 
823 static struct of_device_id mpc_dma_match[] = {
824 	{ .compatible = "fsl,mpc5121-dma", },
825 	{},
826 };
827 
828 static struct platform_driver mpc_dma_driver = {
829 	.probe		= mpc_dma_probe,
830 	.remove		= __devexit_p(mpc_dma_remove),
831 	.driver = {
832 		.name = DRV_NAME,
833 		.owner = THIS_MODULE,
834 		.of_match_table	= mpc_dma_match,
835 	},
836 };
837 
838 module_platform_driver(mpc_dma_driver);
839 
840 MODULE_LICENSE("GPL");
841 MODULE_AUTHOR("Piotr Ziecik <kosmo@semihalf.com>");
842