?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 3.4.102
[linux/fpc-iii.git] / drivers / dma / coh901318.c
blob750925f9638bab656b39ccff65bed7dbdbee405c
1 /*
2 * driver/dma/coh901318.c
3 *
4 * Copyright (C) 2007-2009 ST-Ericsson
5 * License terms: GNU General Public License (GPL) version 2
6 * DMA driver for COH 901 318
7 * Author: Per Friden <per.friden@stericsson.com>
8 */
9
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h> /* printk() */
13 #include <linux/fs.h> /* everything... */
14 #include <linux/scatterlist.h>
15 #include <linux/slab.h> /* kmalloc() */
16 #include <linux/dmaengine.h>
17 #include <linux/platform_device.h>
18 #include <linux/device.h>
19 #include <linux/irqreturn.h>
20 #include <linux/interrupt.h>
21 #include <linux/io.h>
22 #include <linux/uaccess.h>
23 #include <linux/debugfs.h>
24 #include <mach/coh901318.h>
25
26 #include "coh901318_lli.h"
27 #include "dmaengine.h"
28
29 #define COHC_2_DEV(cohc) (&cohc->chan.dev->device)
30
31 #ifdef VERBOSE_DEBUG
32 #define COH_DBG(x) ({ if (1) x; 0; })
33 #else
34 #define COH_DBG(x) ({ if (0) x; 0; })
35 #endif
36
37 struct coh901318_desc {
38 struct dma_async_tx_descriptor desc;
39 struct list_head node;
40 struct scatterlist *sg;
41 unsigned int sg_len;
42 struct coh901318_lli *lli;
43 enum dma_transfer_direction dir;
44 unsigned long flags;
45 u32 head_config;
46 u32 head_ctrl;
47 };
48
49 struct coh901318_base {
50 struct device *dev;
51 void __iomem *virtbase;
52 struct coh901318_pool pool;
53 struct powersave pm;
54 struct dma_device dma_slave;
55 struct dma_device dma_memcpy;
56 struct coh901318_chan *chans;
57 struct coh901318_platform *platform;
58 };
59
60 struct coh901318_chan {
61 spinlock_t lock;
62 int allocated;
63 int id;
64 int stopped;
65
66 struct work_struct free_work;
67 struct dma_chan chan;
68
69 struct tasklet_struct tasklet;
70
71 struct list_head active;
72 struct list_head queue;
73 struct list_head free;
74
75 unsigned long nbr_active_done;
76 unsigned long busy;
77
78 u32 runtime_addr;
79 u32 runtime_ctrl;
80
81 struct coh901318_base *base;
82 };
83
84 static void coh901318_list_print(struct coh901318_chan *cohc,
85 struct coh901318_lli *lli)
86 {
87 struct coh901318_lli *l = lli;
88 int i = 0;
89
90 while (l) {
91 dev_vdbg(COHC_2_DEV(cohc), "i %d, lli %p, ctrl 0x%x, src 0x%x"
92 ", dst 0x%x, link 0x%x virt_link_addr 0x%p\n",
93 i, l, l->control, l->src_addr, l->dst_addr,
94 l->link_addr, l->virt_link_addr);
95 i++;
96 l = l->virt_link_addr;
97 }
98 }
99
100 #ifdef CONFIG_DEBUG_FS
101
102 #define COH901318_DEBUGFS_ASSIGN(x, y) (x = y)
103
104 static struct coh901318_base *debugfs_dma_base;
105 static struct dentry *dma_dentry;
106
107 static int coh901318_debugfs_read(struct file *file, char __user *buf,
108 size_t count, loff_t *f_pos)
109 {
110 u64 started_channels = debugfs_dma_base->pm.started_channels;
111 int pool_count = debugfs_dma_base->pool.debugfs_pool_counter;
112 int i;
113 int ret = 0;
114 char *dev_buf;
115 char *tmp;
116 int dev_size;
117
118 dev_buf = kmalloc(4*1024, GFP_KERNEL);
119 if (dev_buf == NULL)
120 goto err_kmalloc;
121 tmp = dev_buf;
122
123 tmp += sprintf(tmp, "DMA -- enabled dma channels\n");
124
125 for (i = 0; i < debugfs_dma_base->platform->max_channels; i++)
126 if (started_channels & (1 << i))
127 tmp += sprintf(tmp, "channel %d\n", i);
128
129 tmp += sprintf(tmp, "Pool alloc nbr %d\n", pool_count);
130 dev_size = tmp - dev_buf;
131
132 /* No more to read if offset != 0 */
133 if (*f_pos > dev_size)
134 goto out;
135
136 if (count > dev_size - *f_pos)
137 count = dev_size - *f_pos;
138
139 if (copy_to_user(buf, dev_buf + *f_pos, count))
140 ret = -EINVAL;
141 ret = count;
142 *f_pos += count;
143
144 out:
145 kfree(dev_buf);
146 return ret;
147
148 err_kmalloc:
149 return 0;
150 }
151
152 static const struct file_operations coh901318_debugfs_status_operations = {
153 .owner = THIS_MODULE,
154 .open = simple_open,
155 .read = coh901318_debugfs_read,
156 .llseek = default_llseek,
157 };
158
159
160 static int __init init_coh901318_debugfs(void)
161 {
162
163 dma_dentry = debugfs_create_dir("dma", NULL);
164
165 (void) debugfs_create_file("status",
166 S_IFREG | S_IRUGO,
167 dma_dentry, NULL,
168 &coh901318_debugfs_status_operations);
169 return 0;
170 }
171
172 static void __exit exit_coh901318_debugfs(void)
173 {
174 debugfs_remove_recursive(dma_dentry);
175 }
176
177 module_init(init_coh901318_debugfs);
178 module_exit(exit_coh901318_debugfs);
179 #else
180
181 #define COH901318_DEBUGFS_ASSIGN(x, y)
182
183 #endif /* CONFIG_DEBUG_FS */
184
185 static inline struct coh901318_chan *to_coh901318_chan(struct dma_chan *chan)
186 {
187 return container_of(chan, struct coh901318_chan, chan);
188 }
189
190 static inline dma_addr_t
191 cohc_dev_addr(struct coh901318_chan *cohc)
192 {
193 /* Runtime supplied address will take precedence */
194 if (cohc->runtime_addr)
195 return cohc->runtime_addr;
196 return cohc->base->platform->chan_conf[cohc->id].dev_addr;
197 }
198
199 static inline const struct coh901318_params *
200 cohc_chan_param(struct coh901318_chan *cohc)
201 {
202 return &cohc->base->platform->chan_conf[cohc->id].param;
203 }
204
205 static inline const struct coh_dma_channel *
206 cohc_chan_conf(struct coh901318_chan *cohc)
207 {
208 return &cohc->base->platform->chan_conf[cohc->id];
209 }
210
211 static void enable_powersave(struct coh901318_chan *cohc)
212 {
213 unsigned long flags;
214 struct powersave *pm = &cohc->base->pm;
215
216 spin_lock_irqsave(&pm->lock, flags);
217
218 pm->started_channels &= ~(1ULL << cohc->id);
219
220 if (!pm->started_channels) {
221 /* DMA no longer intends to access memory */
222 cohc->base->platform->access_memory_state(cohc->base->dev,
223 false);
224 }
225
226 spin_unlock_irqrestore(&pm->lock, flags);
227 }
228 static void disable_powersave(struct coh901318_chan *cohc)
229 {
230 unsigned long flags;
231 struct powersave *pm = &cohc->base->pm;
232
233 spin_lock_irqsave(&pm->lock, flags);
234
235 if (!pm->started_channels) {
236 /* DMA intends to access memory */
237 cohc->base->platform->access_memory_state(cohc->base->dev,
238 true);
239 }
240
241 pm->started_channels |= (1ULL << cohc->id);
242
243 spin_unlock_irqrestore(&pm->lock, flags);
244 }
245
246 static inline int coh901318_set_ctrl(struct coh901318_chan *cohc, u32 control)
247 {
248 int channel = cohc->id;
249 void __iomem *virtbase = cohc->base->virtbase;
250
251 writel(control,
252 virtbase + COH901318_CX_CTRL +
253 COH901318_CX_CTRL_SPACING * channel);
254 return 0;
255 }
256
257 static inline int coh901318_set_conf(struct coh901318_chan *cohc, u32 conf)
258 {
259 int channel = cohc->id;
260 void __iomem *virtbase = cohc->base->virtbase;
261
262 writel(conf,
263 virtbase + COH901318_CX_CFG +
264 COH901318_CX_CFG_SPACING*channel);
265 return 0;
266 }
267
268
269 static int coh901318_start(struct coh901318_chan *cohc)
270 {
271 u32 val;
272 int channel = cohc->id;
273 void __iomem *virtbase = cohc->base->virtbase;
274
275 disable_powersave(cohc);
276
277 val = readl(virtbase + COH901318_CX_CFG +
278 COH901318_CX_CFG_SPACING * channel);
279
280 /* Enable channel */
281 val |= COH901318_CX_CFG_CH_ENABLE;
282 writel(val, virtbase + COH901318_CX_CFG +
283 COH901318_CX_CFG_SPACING * channel);
284
285 return 0;
286 }
287
288 static int coh901318_prep_linked_list(struct coh901318_chan *cohc,
289 struct coh901318_lli *lli)
290 {
291 int channel = cohc->id;
292 void __iomem *virtbase = cohc->base->virtbase;
293
294 BUG_ON(readl(virtbase + COH901318_CX_STAT +
295 COH901318_CX_STAT_SPACING*channel) &
296 COH901318_CX_STAT_ACTIVE);
297
298 writel(lli->src_addr,
299 virtbase + COH901318_CX_SRC_ADDR +
300 COH901318_CX_SRC_ADDR_SPACING * channel);
301
302 writel(lli->dst_addr, virtbase +
303 COH901318_CX_DST_ADDR +
304 COH901318_CX_DST_ADDR_SPACING * channel);
305
306 writel(lli->link_addr, virtbase + COH901318_CX_LNK_ADDR +
307 COH901318_CX_LNK_ADDR_SPACING * channel);
308
309 writel(lli->control, virtbase + COH901318_CX_CTRL +
310 COH901318_CX_CTRL_SPACING * channel);
311
312 return 0;
313 }
314
315 static struct coh901318_desc *
316 coh901318_desc_get(struct coh901318_chan *cohc)
317 {
318 struct coh901318_desc *desc;
319
320 if (list_empty(&cohc->free)) {
321 /* alloc new desc because we're out of used ones
322 * TODO: alloc a pile of descs instead of just one,
323 * avoid many small allocations.
324 */
325 desc = kzalloc(sizeof(struct coh901318_desc), GFP_NOWAIT);
326 if (desc == NULL)
327 goto out;
328 INIT_LIST_HEAD(&desc->node);
329 dma_async_tx_descriptor_init(&desc->desc, &cohc->chan);
330 } else {
331 /* Reuse an old desc. */
332 desc = list_first_entry(&cohc->free,
333 struct coh901318_desc,
334 node);
335 list_del(&desc->node);
336 /* Initialize it a bit so it's not insane */
337 desc->sg = NULL;
338 desc->sg_len = 0;
339 desc->desc.callback = NULL;
340 desc->desc.callback_param = NULL;
341 }
342
343 out:
344 return desc;
345 }
346
347 static void
348 coh901318_desc_free(struct coh901318_chan *cohc, struct coh901318_desc *cohd)
349 {
350 list_add_tail(&cohd->node, &cohc->free);
351 }
352
353 /* call with irq lock held */
354 static void
355 coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc)
356 {
357 list_add_tail(&desc->node, &cohc->active);
358 }
359
360 static struct coh901318_desc *
361 coh901318_first_active_get(struct coh901318_chan *cohc)
362 {
363 struct coh901318_desc *d;
364
365 if (list_empty(&cohc->active))
366 return NULL;
367
368 d = list_first_entry(&cohc->active,
369 struct coh901318_desc,
370 node);
371 return d;
372 }
373
374 static void
375 coh901318_desc_remove(struct coh901318_desc *cohd)
376 {
377 list_del(&cohd->node);
378 }
379
380 static void
381 coh901318_desc_queue(struct coh901318_chan *cohc, struct coh901318_desc *desc)
382 {
383 list_add_tail(&desc->node, &cohc->queue);
384 }
385
386 static struct coh901318_desc *
387 coh901318_first_queued(struct coh901318_chan *cohc)
388 {
389 struct coh901318_desc *d;
390
391 if (list_empty(&cohc->queue))
392 return NULL;
393
394 d = list_first_entry(&cohc->queue,
395 struct coh901318_desc,
396 node);
397 return d;
398 }
399
400 static inline u32 coh901318_get_bytes_in_lli(struct coh901318_lli *in_lli)
401 {
402 struct coh901318_lli *lli = in_lli;
403 u32 bytes = 0;
404
405 while (lli) {
406 bytes += lli->control & COH901318_CX_CTRL_TC_VALUE_MASK;
407 lli = lli->virt_link_addr;
408 }
409 return bytes;
410 }
411
412 /*
413 * Get the number of bytes left to transfer on this channel,
414 * it is unwise to call this before stopping the channel for
415 * absolute measures, but for a rough guess you can still call
416 * it.
417 */
418 static u32 coh901318_get_bytes_left(struct dma_chan *chan)
419 {
420 struct coh901318_chan *cohc = to_coh901318_chan(chan);
421 struct coh901318_desc *cohd;
422 struct list_head *pos;
423 unsigned long flags;
424 u32 left = 0;
425 int i = 0;
426
427 spin_lock_irqsave(&cohc->lock, flags);
428
429 /*
430 * If there are many queued jobs, we iterate and add the
431 * size of them all. We take a special look on the first
432 * job though, since it is probably active.
433 */
434 list_for_each(pos, &cohc->active) {
435 /*
436 * The first job in the list will be working on the
437 * hardware. The job can be stopped but still active,
438 * so that the transfer counter is somewhere inside
439 * the buffer.
440 */
441 cohd = list_entry(pos, struct coh901318_desc, node);
442
443 if (i == 0) {
444 struct coh901318_lli *lli;
445 dma_addr_t ladd;
446
447 /* Read current transfer count value */
448 left = readl(cohc->base->virtbase +
449 COH901318_CX_CTRL +
450 COH901318_CX_CTRL_SPACING * cohc->id) &
451 COH901318_CX_CTRL_TC_VALUE_MASK;
452
453 /* See if the transfer is linked... */
454 ladd = readl(cohc->base->virtbase +
455 COH901318_CX_LNK_ADDR +
456 COH901318_CX_LNK_ADDR_SPACING *
457 cohc->id) &
458 ~COH901318_CX_LNK_LINK_IMMEDIATE;
459 /* Single transaction */
460 if (!ladd)
461 continue;
462
463 /*
464 * Linked transaction, follow the lli, find the
465 * currently processing lli, and proceed to the next
466 */
467 lli = cohd->lli;
468 while (lli && lli->link_addr != ladd)
469 lli = lli->virt_link_addr;
470
471 if (lli)
472 lli = lli->virt_link_addr;
473
474 /*
475 * Follow remaining lli links around to count the total
476 * number of bytes left
477 */
478 left += coh901318_get_bytes_in_lli(lli);
479 } else {
480 left += coh901318_get_bytes_in_lli(cohd->lli);
481 }
482 i++;
483 }
484
485 /* Also count bytes in the queued jobs */
486 list_for_each(pos, &cohc->queue) {
487 cohd = list_entry(pos, struct coh901318_desc, node);
488 left += coh901318_get_bytes_in_lli(cohd->lli);
489 }
490
491 spin_unlock_irqrestore(&cohc->lock, flags);
492
493 return left;
494 }
495
496 /*
497 * Pauses a transfer without losing data. Enables power save.
498 * Use this function in conjunction with coh901318_resume.
499 */
500 static void coh901318_pause(struct dma_chan *chan)
501 {
502 u32 val;
503 unsigned long flags;
504 struct coh901318_chan *cohc = to_coh901318_chan(chan);
505 int channel = cohc->id;
506 void __iomem *virtbase = cohc->base->virtbase;
507
508 spin_lock_irqsave(&cohc->lock, flags);
509
510 /* Disable channel in HW */
511 val = readl(virtbase + COH901318_CX_CFG +
512 COH901318_CX_CFG_SPACING * channel);
513
514 /* Stopping infinite transfer */
515 if ((val & COH901318_CX_CTRL_TC_ENABLE) == 0 &&
516 (val & COH901318_CX_CFG_CH_ENABLE))
517 cohc->stopped = 1;
518
519
520 val &= ~COH901318_CX_CFG_CH_ENABLE;
521 /* Enable twice, HW bug work around */
522 writel(val, virtbase + COH901318_CX_CFG +
523 COH901318_CX_CFG_SPACING * channel);
524 writel(val, virtbase + COH901318_CX_CFG +
525 COH901318_CX_CFG_SPACING * channel);
526
527 /* Spin-wait for it to actually go inactive */
528 while (readl(virtbase + COH901318_CX_STAT+COH901318_CX_STAT_SPACING *
529 channel) & COH901318_CX_STAT_ACTIVE)
530 cpu_relax();
531
532 /* Check if we stopped an active job */
533 if ((readl(virtbase + COH901318_CX_CTRL+COH901318_CX_CTRL_SPACING *
534 channel) & COH901318_CX_CTRL_TC_VALUE_MASK) > 0)
535 cohc->stopped = 1;
536
537 enable_powersave(cohc);
538
539 spin_unlock_irqrestore(&cohc->lock, flags);
540 }
541
542 /* Resumes a transfer that has been stopped via 300_dma_stop(..).
543 Power save is handled.
544 */
545 static void coh901318_resume(struct dma_chan *chan)
546 {
547 u32 val;
548 unsigned long flags;
549 struct coh901318_chan *cohc = to_coh901318_chan(chan);
550 int channel = cohc->id;
551
552 spin_lock_irqsave(&cohc->lock, flags);
553
554 disable_powersave(cohc);
555
556 if (cohc->stopped) {
557 /* Enable channel in HW */
558 val = readl(cohc->base->virtbase + COH901318_CX_CFG +
559 COH901318_CX_CFG_SPACING * channel);
560
561 val |= COH901318_CX_CFG_CH_ENABLE;
562
563 writel(val, cohc->base->virtbase + COH901318_CX_CFG +
564 COH901318_CX_CFG_SPACING*channel);
565
566 cohc->stopped = 0;
567 }
568
569 spin_unlock_irqrestore(&cohc->lock, flags);
570 }
571
572 bool coh901318_filter_id(struct dma_chan *chan, void *chan_id)
573 {
574 unsigned int ch_nr = (unsigned int) chan_id;
575
576 if (ch_nr == to_coh901318_chan(chan)->id)
577 return true;
578
579 return false;
580 }
581 EXPORT_SYMBOL(coh901318_filter_id);
582
583 /*
584 * DMA channel allocation
585 */
586 static int coh901318_config(struct coh901318_chan *cohc,
587 struct coh901318_params *param)
588 {
589 unsigned long flags;
590 const struct coh901318_params *p;
591 int channel = cohc->id;
592 void __iomem *virtbase = cohc->base->virtbase;
593
594 spin_lock_irqsave(&cohc->lock, flags);
595
596 if (param)
597 p = param;
598 else
599 p = &cohc->base->platform->chan_conf[channel].param;
600
601 /* Clear any pending BE or TC interrupt */
602 if (channel < 32) {
603 writel(1 << channel, virtbase + COH901318_BE_INT_CLEAR1);
604 writel(1 << channel, virtbase + COH901318_TC_INT_CLEAR1);
605 } else {
606 writel(1 << (channel - 32), virtbase +
607 COH901318_BE_INT_CLEAR2);
608 writel(1 << (channel - 32), virtbase +
609 COH901318_TC_INT_CLEAR2);
610 }
611
612 coh901318_set_conf(cohc, p->config);
613 coh901318_set_ctrl(cohc, p->ctrl_lli_last);
614
615 spin_unlock_irqrestore(&cohc->lock, flags);
616
617 return 0;
618 }
619
620 /* must lock when calling this function
621 * start queued jobs, if any
622 * TODO: start all queued jobs in one go
623 *
624 * Returns descriptor if queued job is started otherwise NULL.
625 * If the queue is empty NULL is returned.
626 */
627 static struct coh901318_desc *coh901318_queue_start(struct coh901318_chan *cohc)
628 {
629 struct coh901318_desc *cohd;
630
631 /*
632 * start queued jobs, if any
633 * TODO: transmit all queued jobs in one go
634 */
635 cohd = coh901318_first_queued(cohc);
636
637 if (cohd != NULL) {
638 /* Remove from queue */
639 coh901318_desc_remove(cohd);
640 /* initiate DMA job */
641 cohc->busy = 1;
642
643 coh901318_desc_submit(cohc, cohd);
644
645 /* Program the transaction head */
646 coh901318_set_conf(cohc, cohd->head_config);
647 coh901318_set_ctrl(cohc, cohd->head_ctrl);
648 coh901318_prep_linked_list(cohc, cohd->lli);
649
650 /* start dma job on this channel */
651 coh901318_start(cohc);
652
653 }
654
655 return cohd;
656 }
657
658 /*
659 * This tasklet is called from the interrupt handler to
660 * handle each descriptor (DMA job) that is sent to a channel.
661 */
662 static void dma_tasklet(unsigned long data)
663 {
664 struct coh901318_chan *cohc = (struct coh901318_chan *) data;
665 struct coh901318_desc *cohd_fin;
666 unsigned long flags;
667 dma_async_tx_callback callback;
668 void *callback_param;
669
670 dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d"
671 " nbr_active_done %ld\n", __func__,
672 cohc->id, cohc->nbr_active_done);
673
674 spin_lock_irqsave(&cohc->lock, flags);
675
676 /* get first active descriptor entry from list */
677 cohd_fin = coh901318_first_active_get(cohc);
678
679 if (cohd_fin == NULL)
680 goto err;
681
682 /* locate callback to client */
683 callback = cohd_fin->desc.callback;
684 callback_param = cohd_fin->desc.callback_param;
685
686 /* sign this job as completed on the channel */
687 dma_cookie_complete(&cohd_fin->desc);
688
689 /* release the lli allocation and remove the descriptor */
690 coh901318_lli_free(&cohc->base->pool, &cohd_fin->lli);
691
692 /* return desc to free-list */
693 coh901318_desc_remove(cohd_fin);
694 coh901318_desc_free(cohc, cohd_fin);
695
696 spin_unlock_irqrestore(&cohc->lock, flags);
697
698 /* Call the callback when we're done */
699 if (callback)
700 callback(callback_param);
701
702 spin_lock_irqsave(&cohc->lock, flags);
703
704 /*
705 * If another interrupt fired while the tasklet was scheduling,
706 * we don't get called twice, so we have this number of active
707 * counter that keep track of the number of IRQs expected to
708 * be handled for this channel. If there happen to be more than
709 * one IRQ to be ack:ed, we simply schedule this tasklet again.
710 */
711 cohc->nbr_active_done--;
712 if (cohc->nbr_active_done) {
713 dev_dbg(COHC_2_DEV(cohc), "scheduling tasklet again, new IRQs "
714 "came in while we were scheduling this tasklet\n");
715 if (cohc_chan_conf(cohc)->priority_high)
716 tasklet_hi_schedule(&cohc->tasklet);
717 else
718 tasklet_schedule(&cohc->tasklet);
719 }
720
721 spin_unlock_irqrestore(&cohc->lock, flags);
722
723 return;
724
725 err:
726 spin_unlock_irqrestore(&cohc->lock, flags);
727 dev_err(COHC_2_DEV(cohc), "[%s] No active dma desc\n", __func__);
728 }
729
730
731 /* called from interrupt context */
732 static void dma_tc_handle(struct coh901318_chan *cohc)
733 {
734 /*
735 * If the channel is not allocated, then we shouldn't have
736 * any TC interrupts on it.
737 */
738 if (!cohc->allocated) {
739 dev_err(COHC_2_DEV(cohc), "spurious interrupt from "
740 "unallocated channel\n");
741 return;
742 }
743
744 spin_lock(&cohc->lock);
745
746 /*
747 * When we reach this point, at least one queue item
748 * should have been moved over from cohc->queue to
749 * cohc->active and run to completion, that is why we're
750 * getting a terminal count interrupt is it not?
751 * If you get this BUG() the most probable cause is that
752 * the individual nodes in the lli chain have IRQ enabled,
753 * so check your platform config for lli chain ctrl.
754 */
755 BUG_ON(list_empty(&cohc->active));
756
757 cohc->nbr_active_done++;
758
759 /*
760 * This attempt to take a job from cohc->queue, put it
761 * into cohc->active and start it.
762 */
763 if (coh901318_queue_start(cohc) == NULL)
764 cohc->busy = 0;
765
766 spin_unlock(&cohc->lock);
767
768 /*
769 * This tasklet will remove items from cohc->active
770 * and thus terminates them.
771 */
772 if (cohc_chan_conf(cohc)->priority_high)
773 tasklet_hi_schedule(&cohc->tasklet);
774 else
775 tasklet_schedule(&cohc->tasklet);
776 }
777
778
779 static irqreturn_t dma_irq_handler(int irq, void *dev_id)
780 {
781 u32 status1;
782 u32 status2;
783 int i;
784 int ch;
785 struct coh901318_base *base = dev_id;
786 struct coh901318_chan *cohc;
787 void __iomem *virtbase = base->virtbase;
788
789 status1 = readl(virtbase + COH901318_INT_STATUS1);
790 status2 = readl(virtbase + COH901318_INT_STATUS2);
791
792 if (unlikely(status1 == 0 && status2 == 0)) {
793 dev_warn(base->dev, "spurious DMA IRQ from no channel!\n");
794 return IRQ_HANDLED;
795 }
796
797 /* TODO: consider handle IRQ in tasklet here to
798 * minimize interrupt latency */
799
800 /* Check the first 32 DMA channels for IRQ */
801 while (status1) {
802 /* Find first bit set, return as a number. */
803 i = ffs(status1) - 1;
804 ch = i;
805
806 cohc = &base->chans[ch];
807 spin_lock(&cohc->lock);
808
809 /* Mask off this bit */
810 status1 &= ~(1 << i);
811 /* Check the individual channel bits */
812 if (test_bit(i, virtbase + COH901318_BE_INT_STATUS1)) {
813 dev_crit(COHC_2_DEV(cohc),
814 "DMA bus error on channel %d!\n", ch);
815 BUG_ON(1);
816 /* Clear BE interrupt */
817 __set_bit(i, virtbase + COH901318_BE_INT_CLEAR1);
818 } else {
819 /* Caused by TC, really? */
820 if (unlikely(!test_bit(i, virtbase +
821 COH901318_TC_INT_STATUS1))) {
822 dev_warn(COHC_2_DEV(cohc),
823 "ignoring interrupt not caused by terminal count on channel %d\n", ch);
824 /* Clear TC interrupt */
825 BUG_ON(1);
826 __set_bit(i, virtbase + COH901318_TC_INT_CLEAR1);
827 } else {
828 /* Enable powersave if transfer has finished */
829 if (!(readl(virtbase + COH901318_CX_STAT +
830 COH901318_CX_STAT_SPACING*ch) &
831 COH901318_CX_STAT_ENABLED)) {
832 enable_powersave(cohc);
833 }
834
835 /* Must clear TC interrupt before calling
836 * dma_tc_handle
837 * in case tc_handle initiate a new dma job
838 */
839 __set_bit(i, virtbase + COH901318_TC_INT_CLEAR1);
840
841 dma_tc_handle(cohc);
842 }
843 }
844 spin_unlock(&cohc->lock);
845 }
846
847 /* Check the remaining 32 DMA channels for IRQ */
848 while (status2) {
849 /* Find first bit set, return as a number. */
850 i = ffs(status2) - 1;
851 ch = i + 32;
852 cohc = &base->chans[ch];
853 spin_lock(&cohc->lock);
854
855 /* Mask off this bit */
856 status2 &= ~(1 << i);
857 /* Check the individual channel bits */
858 if (test_bit(i, virtbase + COH901318_BE_INT_STATUS2)) {
859 dev_crit(COHC_2_DEV(cohc),
860 "DMA bus error on channel %d!\n", ch);
861 /* Clear BE interrupt */
862 BUG_ON(1);
863 __set_bit(i, virtbase + COH901318_BE_INT_CLEAR2);
864 } else {
865 /* Caused by TC, really? */
866 if (unlikely(!test_bit(i, virtbase +
867 COH901318_TC_INT_STATUS2))) {
868 dev_warn(COHC_2_DEV(cohc),
869 "ignoring interrupt not caused by terminal count on channel %d\n", ch);
870 /* Clear TC interrupt */
871 __set_bit(i, virtbase + COH901318_TC_INT_CLEAR2);
872 BUG_ON(1);
873 } else {
874 /* Enable powersave if transfer has finished */
875 if (!(readl(virtbase + COH901318_CX_STAT +
876 COH901318_CX_STAT_SPACING*ch) &
877 COH901318_CX_STAT_ENABLED)) {
878 enable_powersave(cohc);
879 }
880 /* Must clear TC interrupt before calling
881 * dma_tc_handle
882 * in case tc_handle initiate a new dma job
883 */
884 __set_bit(i, virtbase + COH901318_TC_INT_CLEAR2);
885
886 dma_tc_handle(cohc);
887 }
888 }
889 spin_unlock(&cohc->lock);
890 }
891
892 return IRQ_HANDLED;
893 }
894
895 static int coh901318_alloc_chan_resources(struct dma_chan *chan)
896 {
897 struct coh901318_chan *cohc = to_coh901318_chan(chan);
898 unsigned long flags;
899
900 dev_vdbg(COHC_2_DEV(cohc), "[%s] DMA channel %d\n",
901 __func__, cohc->id);
902
903 if (chan->client_count > 1)
904 return -EBUSY;
905
906 spin_lock_irqsave(&cohc->lock, flags);
907
908 coh901318_config(cohc, NULL);
909
910 cohc->allocated = 1;
911 dma_cookie_init(chan);
912
913 spin_unlock_irqrestore(&cohc->lock, flags);
914
915 return 1;
916 }
917
918 static void
919 coh901318_free_chan_resources(struct dma_chan *chan)
920 {
921 struct coh901318_chan *cohc = to_coh901318_chan(chan);
922 int channel = cohc->id;
923 unsigned long flags;
924
925 spin_lock_irqsave(&cohc->lock, flags);
926
927 /* Disable HW */
928 writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CFG +
929 COH901318_CX_CFG_SPACING*channel);
930 writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CTRL +
931 COH901318_CX_CTRL_SPACING*channel);
932
933 cohc->allocated = 0;
934
935 spin_unlock_irqrestore(&cohc->lock, flags);
936
937 chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
938 }
939
940
941 static dma_cookie_t
942 coh901318_tx_submit(struct dma_async_tx_descriptor *tx)
943 {
944 struct coh901318_desc *cohd = container_of(tx, struct coh901318_desc,
945 desc);
946 struct coh901318_chan *cohc = to_coh901318_chan(tx->chan);
947 unsigned long flags;
948 dma_cookie_t cookie;
949
950 spin_lock_irqsave(&cohc->lock, flags);
951 cookie = dma_cookie_assign(tx);
952
953 coh901318_desc_queue(cohc, cohd);
954
955 spin_unlock_irqrestore(&cohc->lock, flags);
956
957 return cookie;
958 }
959
960 static struct dma_async_tx_descriptor *
961 coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
962 size_t size, unsigned long flags)
963 {
964 struct coh901318_lli *lli;
965 struct coh901318_desc *cohd;
966 unsigned long flg;
967 struct coh901318_chan *cohc = to_coh901318_chan(chan);
968 int lli_len;
969 u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
970 int ret;
971
972 spin_lock_irqsave(&cohc->lock, flg);
973
974 dev_vdbg(COHC_2_DEV(cohc),
975 "[%s] channel %d src 0x%x dest 0x%x size %d\n",
976 __func__, cohc->id, src, dest, size);
977
978 if (flags & DMA_PREP_INTERRUPT)
979 /* Trigger interrupt after last lli */
980 ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE;
981
982 lli_len = size >> MAX_DMA_PACKET_SIZE_SHIFT;
983 if ((lli_len << MAX_DMA_PACKET_SIZE_SHIFT) < size)
984 lli_len++;
985
986 lli = coh901318_lli_alloc(&cohc->base->pool, lli_len);
987
988 if (lli == NULL)
989 goto err;
990
991 ret = coh901318_lli_fill_memcpy(
992 &cohc->base->pool, lli, src, size, dest,
993 cohc_chan_param(cohc)->ctrl_lli_chained,
994 ctrl_last);
995 if (ret)
996 goto err;
997
998 COH_DBG(coh901318_list_print(cohc, lli));
999
1000 /* Pick a descriptor to handle this transfer */
1001 cohd = coh901318_desc_get(cohc);
1002 cohd->lli = lli;
1003 cohd->flags = flags;
1004 cohd->desc.tx_submit = coh901318_tx_submit;
1005
1006 spin_unlock_irqrestore(&cohc->lock, flg);
1007
1008 return &cohd->desc;
1009 err:
1010 spin_unlock_irqrestore(&cohc->lock, flg);
1011 return NULL;
1012 }
1013
1014 static struct dma_async_tx_descriptor *
1015 coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
1016 unsigned int sg_len, enum dma_transfer_direction direction,
1017 unsigned long flags, void *context)
1018 {
1019 struct coh901318_chan *cohc = to_coh901318_chan(chan);
1020 struct coh901318_lli *lli;
1021 struct coh901318_desc *cohd;
1022 const struct coh901318_params *params;
1023 struct scatterlist *sg;
1024 int len = 0;
1025 int size;
1026 int i;
1027 u32 ctrl_chained = cohc_chan_param(cohc)->ctrl_lli_chained;
1028 u32 ctrl = cohc_chan_param(cohc)->ctrl_lli;
1029 u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
1030 u32 config;
1031 unsigned long flg;
1032 int ret;
1033
1034 if (!sgl)
1035 goto out;
1036 if (sgl->length == 0)
1037 goto out;
1038
1039 spin_lock_irqsave(&cohc->lock, flg);
1040
1041 dev_vdbg(COHC_2_DEV(cohc), "[%s] sg_len %d dir %d\n",
1042 __func__, sg_len, direction);
1043
1044 if (flags & DMA_PREP_INTERRUPT)
1045 /* Trigger interrupt after last lli */
1046 ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE;
1047
1048 params = cohc_chan_param(cohc);
1049 config = params->config;
1050 /*
1051 * Add runtime-specific control on top, make
1052 * sure the bits you set per peripheral channel are
1053 * cleared in the default config from the platform.
1054 */
1055 ctrl_chained |= cohc->runtime_ctrl;
1056 ctrl_last |= cohc->runtime_ctrl;
1057 ctrl |= cohc->runtime_ctrl;
1058
1059 if (direction == DMA_MEM_TO_DEV) {
1060 u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE |
1061 COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE;
1062
1063 config |= COH901318_CX_CFG_RM_MEMORY_TO_PRIMARY;
1064 ctrl_chained |= tx_flags;
1065 ctrl_last |= tx_flags;
1066 ctrl |= tx_flags;
1067 } else if (direction == DMA_DEV_TO_MEM) {
1068 u32 rx_flags = COH901318_CX_CTRL_PRDD_DEST |
1069 COH901318_CX_CTRL_DST_ADDR_INC_ENABLE;
1070
1071 config |= COH901318_CX_CFG_RM_PRIMARY_TO_MEMORY;
1072 ctrl_chained |= rx_flags;
1073 ctrl_last |= rx_flags;
1074 ctrl |= rx_flags;
1075 } else
1076 goto err_direction;
1077
1078 /* The dma only supports transmitting packages up to
1079 * MAX_DMA_PACKET_SIZE. Calculate to total number of
1080 * dma elemts required to send the entire sg list
1081 */
1082 for_each_sg(sgl, sg, sg_len, i) {
1083 unsigned int factor;
1084 size = sg_dma_len(sg);
1085
1086 if (size <= MAX_DMA_PACKET_SIZE) {
1087 len++;
1088 continue;
1089 }
1090
1091 factor = size >> MAX_DMA_PACKET_SIZE_SHIFT;
1092 if ((factor << MAX_DMA_PACKET_SIZE_SHIFT) < size)
1093 factor++;
1094
1095 len += factor;
1096 }
1097
1098 pr_debug("Allocate %d lli:s for this transfer\n", len);
1099 lli = coh901318_lli_alloc(&cohc->base->pool, len);
1100
1101 if (lli == NULL)
1102 goto err_dma_alloc;
1103
1104 /* initiate allocated lli list */
1105 ret = coh901318_lli_fill_sg(&cohc->base->pool, lli, sgl, sg_len,
1106 cohc_dev_addr(cohc),
1107 ctrl_chained,
1108 ctrl,
1109 ctrl_last,
1110 direction, COH901318_CX_CTRL_TC_IRQ_ENABLE);
1111 if (ret)
1112 goto err_lli_fill;
1113
1114
1115 COH_DBG(coh901318_list_print(cohc, lli));
1116
1117 /* Pick a descriptor to handle this transfer */
1118 cohd = coh901318_desc_get(cohc);
1119 cohd->head_config = config;
1120 /*
1121 * Set the default head ctrl for the channel to the one from the
1122 * lli, things may have changed due to odd buffer alignment
1123 * etc.
1124 */
1125 cohd->head_ctrl = lli->control;
1126 cohd->dir = direction;
1127 cohd->flags = flags;
1128 cohd->desc.tx_submit = coh901318_tx_submit;
1129 cohd->lli = lli;
1130
1131 spin_unlock_irqrestore(&cohc->lock, flg);
1132
1133 return &cohd->desc;
1134 err_lli_fill:
1135 err_dma_alloc:
1136 err_direction:
1137 spin_unlock_irqrestore(&cohc->lock, flg);
1138 out:
1139 return NULL;
1140 }
1141
1142 static enum dma_status
1143 coh901318_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
1144 struct dma_tx_state *txstate)
1145 {
1146 struct coh901318_chan *cohc = to_coh901318_chan(chan);
1147 enum dma_status ret;
1148
1149 ret = dma_cookie_status(chan, cookie, txstate);
1150 /* FIXME: should be conditional on ret != DMA_SUCCESS? */
1151 dma_set_residue(txstate, coh901318_get_bytes_left(chan));
1152
1153 if (ret == DMA_IN_PROGRESS && cohc->stopped)
1154 ret = DMA_PAUSED;
1155
1156 return ret;
1157 }
1158
1159 static void
1160 coh901318_issue_pending(struct dma_chan *chan)
1161 {
1162 struct coh901318_chan *cohc = to_coh901318_chan(chan);
1163 unsigned long flags;
1164
1165 spin_lock_irqsave(&cohc->lock, flags);
1166
1167 /*
1168 * Busy means that pending jobs are already being processed,
1169 * and then there is no point in starting the queue: the
1170 * terminal count interrupt on the channel will take the next
1171 * job on the queue and execute it anyway.
1172 */
1173 if (!cohc->busy)
1174 coh901318_queue_start(cohc);
1175
1176 spin_unlock_irqrestore(&cohc->lock, flags);
1177 }
1178
1179 /*
1180 * Here we wrap in the runtime dma control interface
1181 */
1182 struct burst_table {
1183 int burst_8bit;
1184 int burst_16bit;
1185 int burst_32bit;
1186 u32 reg;
1187 };
1188
1189 static const struct burst_table burst_sizes[] = {
1190 {
1191 .burst_8bit = 64,
1192 .burst_16bit = 32,
1193 .burst_32bit = 16,
1194 .reg = COH901318_CX_CTRL_BURST_COUNT_64_BYTES,
1195 },
1196 {
1197 .burst_8bit = 48,
1198 .burst_16bit = 24,
1199 .burst_32bit = 12,
1200 .reg = COH901318_CX_CTRL_BURST_COUNT_48_BYTES,
1201 },
1202 {
1203 .burst_8bit = 32,
1204 .burst_16bit = 16,
1205 .burst_32bit = 8,
1206 .reg = COH901318_CX_CTRL_BURST_COUNT_32_BYTES,
1207 },
1208 {
1209 .burst_8bit = 16,
1210 .burst_16bit = 8,
1211 .burst_32bit = 4,
1212 .reg = COH901318_CX_CTRL_BURST_COUNT_16_BYTES,
1213 },
1214 {
1215 .burst_8bit = 8,
1216 .burst_16bit = 4,
1217 .burst_32bit = 2,
1218 .reg = COH901318_CX_CTRL_BURST_COUNT_8_BYTES,
1219 },
1220 {
1221 .burst_8bit = 4,
1222 .burst_16bit = 2,
1223 .burst_32bit = 1,
1224 .reg = COH901318_CX_CTRL_BURST_COUNT_4_BYTES,
1225 },
1226 {
1227 .burst_8bit = 2,
1228 .burst_16bit = 1,
1229 .burst_32bit = 0,
1230 .reg = COH901318_CX_CTRL_BURST_COUNT_2_BYTES,
1231 },
1232 {
1233 .burst_8bit = 1,
1234 .burst_16bit = 0,
1235 .burst_32bit = 0,
1236 .reg = COH901318_CX_CTRL_BURST_COUNT_1_BYTE,
1237 },
1238 };
1239
1240 static void coh901318_dma_set_runtimeconfig(struct dma_chan *chan,
1241 struct dma_slave_config *config)
1242 {
1243 struct coh901318_chan *cohc = to_coh901318_chan(chan);
1244 dma_addr_t addr;
1245 enum dma_slave_buswidth addr_width;
1246 u32 maxburst;
1247 u32 runtime_ctrl = 0;
1248 int i = 0;
1249
1250 /* We only support mem to per or per to mem transfers */
1251 if (config->direction == DMA_DEV_TO_MEM) {
1252 addr = config->src_addr;
1253 addr_width = config->src_addr_width;
1254 maxburst = config->src_maxburst;
1255 } else if (config->direction == DMA_MEM_TO_DEV) {
1256 addr = config->dst_addr;
1257 addr_width = config->dst_addr_width;
1258 maxburst = config->dst_maxburst;
1259 } else {
1260 dev_err(COHC_2_DEV(cohc), "illegal channel mode\n");
1261 return;
1262 }
1263
1264 dev_dbg(COHC_2_DEV(cohc), "configure channel for %d byte transfers\n",
1265 addr_width);
1266 switch (addr_width) {
1267 case DMA_SLAVE_BUSWIDTH_1_BYTE:
1268 runtime_ctrl |=
1269 COH901318_CX_CTRL_SRC_BUS_SIZE_8_BITS |
1270 COH901318_CX_CTRL_DST_BUS_SIZE_8_BITS;
1271
1272 while (i < ARRAY_SIZE(burst_sizes)) {
1273 if (burst_sizes[i].burst_8bit <= maxburst)
1274 break;
1275 i++;
1276 }
1277
1278 break;
1279 case DMA_SLAVE_BUSWIDTH_2_BYTES:
1280 runtime_ctrl |=
1281 COH901318_CX_CTRL_SRC_BUS_SIZE_16_BITS |
1282 COH901318_CX_CTRL_DST_BUS_SIZE_16_BITS;
1283
1284 while (i < ARRAY_SIZE(burst_sizes)) {
1285 if (burst_sizes[i].burst_16bit <= maxburst)
1286 break;
1287 i++;
1288 }
1289
1290 break;
1291 case DMA_SLAVE_BUSWIDTH_4_BYTES:
1292 /* Direction doesn't matter here, it's 32/32 bits */
1293 runtime_ctrl |=
1294 COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS |
1295 COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS;
1296
1297 while (i < ARRAY_SIZE(burst_sizes)) {
1298 if (burst_sizes[i].burst_32bit <= maxburst)
1299 break;
1300 i++;
1301 }
1302
1303 break;
1304 default:
1305 dev_err(COHC_2_DEV(cohc),
1306 "bad runtimeconfig: alien address width\n");
1307 return;
1308 }
1309
1310 runtime_ctrl |= burst_sizes[i].reg;
1311 dev_dbg(COHC_2_DEV(cohc),
1312 "selected burst size %d bytes for address width %d bytes, maxburst %d\n",
1313 burst_sizes[i].burst_8bit, addr_width, maxburst);
1314
1315 cohc->runtime_addr = addr;
1316 cohc->runtime_ctrl = runtime_ctrl;
1317 }
1318
1319 static int
1320 coh901318_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
1321 unsigned long arg)
1322 {
1323 unsigned long flags;
1324 struct coh901318_chan *cohc = to_coh901318_chan(chan);
1325 struct coh901318_desc *cohd;
1326 void __iomem *virtbase = cohc->base->virtbase;
1327
1328 if (cmd == DMA_SLAVE_CONFIG) {
1329 struct dma_slave_config *config =
1330 (struct dma_slave_config *) arg;
1331
1332 coh901318_dma_set_runtimeconfig(chan, config);
1333 return 0;
1334 }
1335
1336 if (cmd == DMA_PAUSE) {
1337 coh901318_pause(chan);
1338 return 0;
1339 }
1340
1341 if (cmd == DMA_RESUME) {
1342 coh901318_resume(chan);
1343 return 0;
1344 }
1345
1346 if (cmd != DMA_TERMINATE_ALL)
1347 return -ENXIO;
1348
1349 /* The remainder of this function terminates the transfer */
1350 coh901318_pause(chan);
1351 spin_lock_irqsave(&cohc->lock, flags);
1352
1353 /* Clear any pending BE or TC interrupt */
1354 if (cohc->id < 32) {
1355 writel(1 << cohc->id, virtbase + COH901318_BE_INT_CLEAR1);
1356 writel(1 << cohc->id, virtbase + COH901318_TC_INT_CLEAR1);
1357 } else {
1358 writel(1 << (cohc->id - 32), virtbase +
1359 COH901318_BE_INT_CLEAR2);
1360 writel(1 << (cohc->id - 32), virtbase +
1361 COH901318_TC_INT_CLEAR2);
1362 }
1363
1364 enable_powersave(cohc);
1365
1366 while ((cohd = coh901318_first_active_get(cohc))) {
1367 /* release the lli allocation*/
1368 coh901318_lli_free(&cohc->base->pool, &cohd->lli);
1369
1370 /* return desc to free-list */
1371 coh901318_desc_remove(cohd);
1372 coh901318_desc_free(cohc, cohd);
1373 }
1374
1375 while ((cohd = coh901318_first_queued(cohc))) {
1376 /* release the lli allocation*/
1377 coh901318_lli_free(&cohc->base->pool, &cohd->lli);
1378
1379 /* return desc to free-list */
1380 coh901318_desc_remove(cohd);
1381 coh901318_desc_free(cohc, cohd);
1382 }
1383
1384
1385 cohc->nbr_active_done = 0;
1386 cohc->busy = 0;
1387
1388 spin_unlock_irqrestore(&cohc->lock, flags);
1389
1390 return 0;
1391 }
1392
1393 void coh901318_base_init(struct dma_device *dma, const int *pick_chans,
1394 struct coh901318_base *base)
1395 {
1396 int chans_i;
1397 int i = 0;
1398 struct coh901318_chan *cohc;
1399
1400 INIT_LIST_HEAD(&dma->channels);
1401
1402 for (chans_i = 0; pick_chans[chans_i] != -1; chans_i += 2) {
1403 for (i = pick_chans[chans_i]; i <= pick_chans[chans_i+1]; i++) {
1404 cohc = &base->chans[i];
1405
1406 cohc->base = base;
1407 cohc->chan.device = dma;
1408 cohc->id = i;
1409
1410 /* TODO: do we really need this lock if only one
1411 * client is connected to each channel?
1412 */
1413
1414 spin_lock_init(&cohc->lock);
1415
1416 cohc->nbr_active_done = 0;
1417 cohc->busy = 0;
1418 INIT_LIST_HEAD(&cohc->free);
1419 INIT_LIST_HEAD(&cohc->active);
1420 INIT_LIST_HEAD(&cohc->queue);
1421
1422 tasklet_init(&cohc->tasklet, dma_tasklet,
1423 (unsigned long) cohc);
1424
1425 list_add_tail(&cohc->chan.device_node,
1426 &dma->channels);
1427 }
1428 }
1429 }
1430
1431 static int __init coh901318_probe(struct platform_device *pdev)
1432 {
1433 int err = 0;
1434 struct coh901318_platform *pdata;
1435 struct coh901318_base *base;
1436 int irq;
1437 struct resource *io;
1438
1439 io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1440 if (!io)
1441 goto err_get_resource;
1442
1443 /* Map DMA controller registers to virtual memory */
1444 if (request_mem_region(io->start,
1445 resource_size(io),
1446 pdev->dev.driver->name) == NULL) {
1447 err = -EBUSY;
1448 goto err_request_mem;
1449 }
1450
1451 pdata = pdev->dev.platform_data;
1452 if (!pdata)
1453 goto err_no_platformdata;
1454
1455 base = kmalloc(ALIGN(sizeof(struct coh901318_base), 4) +
1456 pdata->max_channels *
1457 sizeof(struct coh901318_chan),
1458 GFP_KERNEL);
1459 if (!base)
1460 goto err_alloc_coh_dma_channels;
1461
1462 base->chans = ((void *)base) + ALIGN(sizeof(struct coh901318_base), 4);
1463
1464 base->virtbase = ioremap(io->start, resource_size(io));
1465 if (!base->virtbase) {
1466 err = -ENOMEM;
1467 goto err_no_ioremap;
1468 }
1469
1470 base->dev = &pdev->dev;
1471 base->platform = pdata;
1472 spin_lock_init(&base->pm.lock);
1473 base->pm.started_channels = 0;
1474
1475 COH901318_DEBUGFS_ASSIGN(debugfs_dma_base, base);
1476
1477 platform_set_drvdata(pdev, base);
1478
1479 irq = platform_get_irq(pdev, 0);
1480 if (irq < 0)
1481 goto err_no_irq;
1482
1483 err = request_irq(irq, dma_irq_handler, IRQF_DISABLED,
1484 "coh901318", base);
1485 if (err) {
1486 dev_crit(&pdev->dev,
1487 "Cannot allocate IRQ for DMA controller!\n");
1488 goto err_request_irq;
1489 }
1490
1491 err = coh901318_pool_create(&base->pool, &pdev->dev,
1492 sizeof(struct coh901318_lli),
1493 32);
1494 if (err)
1495 goto err_pool_create;
1496
1497 /* init channels for device transfers */
1498 coh901318_base_init(&base->dma_slave, base->platform->chans_slave,
1499 base);
1500
1501 dma_cap_zero(base->dma_slave.cap_mask);
1502 dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
1503
1504 base->dma_slave.device_alloc_chan_resources = coh901318_alloc_chan_resources;
1505 base->dma_slave.device_free_chan_resources = coh901318_free_chan_resources;
1506 base->dma_slave.device_prep_slave_sg = coh901318_prep_slave_sg;
1507 base->dma_slave.device_tx_status = coh901318_tx_status;
1508 base->dma_slave.device_issue_pending = coh901318_issue_pending;
1509 base->dma_slave.device_control = coh901318_control;
1510 base->dma_slave.dev = &pdev->dev;
1511
1512 err = dma_async_device_register(&base->dma_slave);
1513
1514 if (err)
1515 goto err_register_slave;
1516
1517 /* init channels for memcpy */
1518 coh901318_base_init(&base->dma_memcpy, base->platform->chans_memcpy,
1519 base);
1520
1521 dma_cap_zero(base->dma_memcpy.cap_mask);
1522 dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
1523
1524 base->dma_memcpy.device_alloc_chan_resources = coh901318_alloc_chan_resources;
1525 base->dma_memcpy.device_free_chan_resources = coh901318_free_chan_resources;
1526 base->dma_memcpy.device_prep_dma_memcpy = coh901318_prep_memcpy;
1527 base->dma_memcpy.device_tx_status = coh901318_tx_status;
1528 base->dma_memcpy.device_issue_pending = coh901318_issue_pending;
1529 base->dma_memcpy.device_control = coh901318_control;
1530 base->dma_memcpy.dev = &pdev->dev;
1531 /*
1532 * This controller can only access address at even 32bit boundaries,
1533 * i.e. 2^2
1534 */
1535 base->dma_memcpy.copy_align = 2;
1536 err = dma_async_device_register(&base->dma_memcpy);
1537
1538 if (err)
1539 goto err_register_memcpy;
1540
1541 dev_info(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n",
1542 (u32) base->virtbase);
1543
1544 return err;
1545
1546 err_register_memcpy:
1547 dma_async_device_unregister(&base->dma_slave);
1548 err_register_slave:
1549 coh901318_pool_destroy(&base->pool);
1550 err_pool_create:
1551 free_irq(platform_get_irq(pdev, 0), base);
1552 err_request_irq:
1553 err_no_irq:
1554 iounmap(base->virtbase);
1555 err_no_ioremap:
1556 kfree(base);
1557 err_alloc_coh_dma_channels:
1558 err_no_platformdata:
1559 release_mem_region(pdev->resource->start,
1560 resource_size(pdev->resource));
1561 err_request_mem:
1562 err_get_resource:
1563 return err;
1564 }
1565
1566 static int __exit coh901318_remove(struct platform_device *pdev)
1567 {
1568 struct coh901318_base *base = platform_get_drvdata(pdev);
1569
1570 dma_async_device_unregister(&base->dma_memcpy);
1571 dma_async_device_unregister(&base->dma_slave);
1572 coh901318_pool_destroy(&base->pool);
1573 free_irq(platform_get_irq(pdev, 0), base);
1574 iounmap(base->virtbase);
1575 kfree(base);
1576 release_mem_region(pdev->resource->start,
1577 resource_size(pdev->resource));
1578 return 0;
1579 }
1580
1581
1582 static struct platform_driver coh901318_driver = {
1583 .remove = __exit_p(coh901318_remove),
1584 .driver = {
1585 .name = "coh901318",
1586 },
1587 };
1588
1589 int __init coh901318_init(void)
1590 {
1591 return platform_driver_probe(&coh901318_driver, coh901318_probe);
1592 }
1593 subsys_initcall(coh901318_init);
1594
1595 void __exit coh901318_exit(void)
1596 {
1597 platform_driver_unregister(&coh901318_driver);
1598 }
1599 module_exit(coh901318_exit);
1600
1601 MODULE_LICENSE("GPL");
1602 MODULE_AUTHOR("Per Friden");
Linux with added FPC-III support