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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / drivers / dma / sh / shdmac.c
blob11707df1a68944979c99579605c0afcd25a41364
1 /*
2 * Renesas SuperH DMA Engine support
3 *
4 * base is drivers/dma/flsdma.c
5 *
6 * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
7 * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
8 * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
9 * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
10 *
11 * This is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * - DMA of SuperH does not have Hardware DMA chain mode.
17 * - MAX DMA size is 16MB.
18 *
19 */
20
21 #include <linux/delay.h>
22 #include <linux/dmaengine.h>
23 #include <linux/err.h>
24 #include <linux/init.h>
25 #include <linux/interrupt.h>
26 #include <linux/kdebug.h>
27 #include <linux/module.h>
28 #include <linux/notifier.h>
29 #include <linux/of.h>
30 #include <linux/of_device.h>
31 #include <linux/platform_device.h>
32 #include <linux/pm_runtime.h>
33 #include <linux/rculist.h>
34 #include <linux/sh_dma.h>
35 #include <linux/slab.h>
36 #include <linux/spinlock.h>
37
38 #include "../dmaengine.h"
39 #include "shdma.h"
40
41 /* DMA registers */
42 #define SAR 0x00 /* Source Address Register */
43 #define DAR 0x04 /* Destination Address Register */
44 #define TCR 0x08 /* Transfer Count Register */
45 #define CHCR 0x0C /* Channel Control Register */
46 #define DMAOR 0x40 /* DMA Operation Register */
47
48 #define TEND 0x18 /* USB-DMAC */
49
50 #define SH_DMAE_DRV_NAME "sh-dma-engine"
51
52 /* Default MEMCPY transfer size = 2^2 = 4 bytes */
53 #define LOG2_DEFAULT_XFER_SIZE 2
54 #define SH_DMA_SLAVE_NUMBER 256
55 #define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1)
56
57 /*
58 * Used for write-side mutual exclusion for the global device list,
59 * read-side synchronization by way of RCU, and per-controller data.
60 */
61 static DEFINE_SPINLOCK(sh_dmae_lock);
62 static LIST_HEAD(sh_dmae_devices);
63
64 /*
65 * Different DMAC implementations provide different ways to clear DMA channels:
66 * (1) none - no CHCLR registers are available
67 * (2) one CHCLR register per channel - 0 has to be written to it to clear
68 * channel buffers
69 * (3) one CHCLR per several channels - 1 has to be written to the bit,
70 * corresponding to the specific channel to reset it
71 */
72 static void channel_clear(struct sh_dmae_chan *sh_dc)
73 {
74 struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
75 const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel +
76 sh_dc->shdma_chan.id;
77 u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0;
78
79 __raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset);
80 }
81
82 static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
83 {
84 __raw_writel(data, sh_dc->base + reg);
85 }
86
87 static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
88 {
89 return __raw_readl(sh_dc->base + reg);
90 }
91
92 static u16 dmaor_read(struct sh_dmae_device *shdev)
93 {
94 void __iomem *addr = shdev->chan_reg + DMAOR;
95
96 if (shdev->pdata->dmaor_is_32bit)
97 return __raw_readl(addr);
98 else
99 return __raw_readw(addr);
100 }
101
102 static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
103 {
104 void __iomem *addr = shdev->chan_reg + DMAOR;
105
106 if (shdev->pdata->dmaor_is_32bit)
107 __raw_writel(data, addr);
108 else
109 __raw_writew(data, addr);
110 }
111
112 static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
113 {
114 struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
115
116 __raw_writel(data, sh_dc->base + shdev->chcr_offset);
117 }
118
119 static u32 chcr_read(struct sh_dmae_chan *sh_dc)
120 {
121 struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
122
123 return __raw_readl(sh_dc->base + shdev->chcr_offset);
124 }
125
126 /*
127 * Reset DMA controller
128 *
129 * SH7780 has two DMAOR register
130 */
131 static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev)
132 {
133 unsigned short dmaor;
134 unsigned long flags;
135
136 spin_lock_irqsave(&sh_dmae_lock, flags);
137
138 dmaor = dmaor_read(shdev);
139 dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME));
140
141 spin_unlock_irqrestore(&sh_dmae_lock, flags);
142 }
143
144 static int sh_dmae_rst(struct sh_dmae_device *shdev)
145 {
146 unsigned short dmaor;
147 unsigned long flags;
148
149 spin_lock_irqsave(&sh_dmae_lock, flags);
150
151 dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME);
152
153 if (shdev->pdata->chclr_present) {
154 int i;
155 for (i = 0; i < shdev->pdata->channel_num; i++) {
156 struct sh_dmae_chan *sh_chan = shdev->chan[i];
157 if (sh_chan)
158 channel_clear(sh_chan);
159 }
160 }
161
162 dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init);
163
164 dmaor = dmaor_read(shdev);
165
166 spin_unlock_irqrestore(&sh_dmae_lock, flags);
167
168 if (dmaor & (DMAOR_AE | DMAOR_NMIF)) {
169 dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n");
170 return -EIO;
171 }
172 if (shdev->pdata->dmaor_init & ~dmaor)
173 dev_warn(shdev->shdma_dev.dma_dev.dev,
174 "DMAOR=0x%x hasn't latched the initial value 0x%x.\n",
175 dmaor, shdev->pdata->dmaor_init);
176 return 0;
177 }
178
179 static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
180 {
181 u32 chcr = chcr_read(sh_chan);
182
183 if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE)
184 return true; /* working */
185
186 return false; /* waiting */
187 }
188
189 static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
190 {
191 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
192 const struct sh_dmae_pdata *pdata = shdev->pdata;
193 int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
194 ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
195
196 if (cnt >= pdata->ts_shift_num)
197 cnt = 0;
198
199 return pdata->ts_shift[cnt];
200 }
201
202 static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
203 {
204 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
205 const struct sh_dmae_pdata *pdata = shdev->pdata;
206 int i;
207
208 for (i = 0; i < pdata->ts_shift_num; i++)
209 if (pdata->ts_shift[i] == l2size)
210 break;
211
212 if (i == pdata->ts_shift_num)
213 i = 0;
214
215 return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) |
216 ((i << pdata->ts_high_shift) & pdata->ts_high_mask);
217 }
218
219 static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw)
220 {
221 sh_dmae_writel(sh_chan, hw->sar, SAR);
222 sh_dmae_writel(sh_chan, hw->dar, DAR);
223 sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR);
224 }
225
226 static void dmae_start(struct sh_dmae_chan *sh_chan)
227 {
228 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
229 u32 chcr = chcr_read(sh_chan);
230
231 if (shdev->pdata->needs_tend_set)
232 sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND);
233
234 chcr |= CHCR_DE | shdev->chcr_ie_bit;
235 chcr_write(sh_chan, chcr & ~CHCR_TE);
236 }
237
238 static void dmae_init(struct sh_dmae_chan *sh_chan)
239 {
240 /*
241 * Default configuration for dual address memory-memory transfer.
242 */
243 u32 chcr = DM_INC | SM_INC | RS_AUTO | log2size_to_chcr(sh_chan,
244 LOG2_DEFAULT_XFER_SIZE);
245 sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr);
246 chcr_write(sh_chan, chcr);
247 }
248
249 static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
250 {
251 /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */
252 if (dmae_is_busy(sh_chan))
253 return -EBUSY;
254
255 sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val);
256 chcr_write(sh_chan, val);
257
258 return 0;
259 }
260
261 static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
262 {
263 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
264 const struct sh_dmae_pdata *pdata = shdev->pdata;
265 const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id];
266 void __iomem *addr = shdev->dmars;
267 unsigned int shift = chan_pdata->dmars_bit;
268
269 if (dmae_is_busy(sh_chan))
270 return -EBUSY;
271
272 if (pdata->no_dmars)
273 return 0;
274
275 /* in the case of a missing DMARS resource use first memory window */
276 if (!addr)
277 addr = shdev->chan_reg;
278 addr += chan_pdata->dmars;
279
280 __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
281 addr);
282
283 return 0;
284 }
285
286 static void sh_dmae_start_xfer(struct shdma_chan *schan,
287 struct shdma_desc *sdesc)
288 {
289 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
290 shdma_chan);
291 struct sh_dmae_desc *sh_desc = container_of(sdesc,
292 struct sh_dmae_desc, shdma_desc);
293 dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n",
294 sdesc->async_tx.cookie, sh_chan->shdma_chan.id,
295 sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar);
296 /* Get the ld start address from ld_queue */
297 dmae_set_reg(sh_chan, &sh_desc->hw);
298 dmae_start(sh_chan);
299 }
300
301 static bool sh_dmae_channel_busy(struct shdma_chan *schan)
302 {
303 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
304 shdma_chan);
305 return dmae_is_busy(sh_chan);
306 }
307
308 static void sh_dmae_setup_xfer(struct shdma_chan *schan,
309 int slave_id)
310 {
311 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
312 shdma_chan);
313
314 if (slave_id >= 0) {
315 const struct sh_dmae_slave_config *cfg =
316 sh_chan->config;
317
318 dmae_set_dmars(sh_chan, cfg->mid_rid);
319 dmae_set_chcr(sh_chan, cfg->chcr);
320 } else {
321 dmae_init(sh_chan);
322 }
323 }
324
325 /*
326 * Find a slave channel configuration from the contoller list by either a slave
327 * ID in the non-DT case, or by a MID/RID value in the DT case
328 */
329 static const struct sh_dmae_slave_config *dmae_find_slave(
330 struct sh_dmae_chan *sh_chan, int match)
331 {
332 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
333 const struct sh_dmae_pdata *pdata = shdev->pdata;
334 const struct sh_dmae_slave_config *cfg;
335 int i;
336
337 if (!sh_chan->shdma_chan.dev->of_node) {
338 if (match >= SH_DMA_SLAVE_NUMBER)
339 return NULL;
340
341 for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
342 if (cfg->slave_id == match)
343 return cfg;
344 } else {
345 for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
346 if (cfg->mid_rid == match) {
347 sh_chan->shdma_chan.slave_id = i;
348 return cfg;
349 }
350 }
351
352 return NULL;
353 }
354
355 static int sh_dmae_set_slave(struct shdma_chan *schan,
356 int slave_id, dma_addr_t slave_addr, bool try)
357 {
358 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
359 shdma_chan);
360 const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id);
361 if (!cfg)
362 return -ENXIO;
363
364 if (!try) {
365 sh_chan->config = cfg;
366 sh_chan->slave_addr = slave_addr ? : cfg->addr;
367 }
368
369 return 0;
370 }
371
372 static void dmae_halt(struct sh_dmae_chan *sh_chan)
373 {
374 struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
375 u32 chcr = chcr_read(sh_chan);
376
377 chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit);
378 chcr_write(sh_chan, chcr);
379 }
380
381 static int sh_dmae_desc_setup(struct shdma_chan *schan,
382 struct shdma_desc *sdesc,
383 dma_addr_t src, dma_addr_t dst, size_t *len)
384 {
385 struct sh_dmae_desc *sh_desc = container_of(sdesc,
386 struct sh_dmae_desc, shdma_desc);
387
388 if (*len > schan->max_xfer_len)
389 *len = schan->max_xfer_len;
390
391 sh_desc->hw.sar = src;
392 sh_desc->hw.dar = dst;
393 sh_desc->hw.tcr = *len;
394
395 return 0;
396 }
397
398 static void sh_dmae_halt(struct shdma_chan *schan)
399 {
400 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
401 shdma_chan);
402 dmae_halt(sh_chan);
403 }
404
405 static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq)
406 {
407 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
408 shdma_chan);
409
410 if (!(chcr_read(sh_chan) & CHCR_TE))
411 return false;
412
413 /* DMA stop */
414 dmae_halt(sh_chan);
415
416 return true;
417 }
418
419 static size_t sh_dmae_get_partial(struct shdma_chan *schan,
420 struct shdma_desc *sdesc)
421 {
422 struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
423 shdma_chan);
424 struct sh_dmae_desc *sh_desc = container_of(sdesc,
425 struct sh_dmae_desc, shdma_desc);
426 return sh_desc->hw.tcr -
427 (sh_dmae_readl(sh_chan, TCR) << sh_chan->xmit_shift);
428 }
429
430 /* Called from error IRQ or NMI */
431 static bool sh_dmae_reset(struct sh_dmae_device *shdev)
432 {
433 bool ret;
434
435 /* halt the dma controller */
436 sh_dmae_ctl_stop(shdev);
437
438 /* We cannot detect, which channel caused the error, have to reset all */
439 ret = shdma_reset(&shdev->shdma_dev);
440
441 sh_dmae_rst(shdev);
442
443 return ret;
444 }
445
446 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
447 static irqreturn_t sh_dmae_err(int irq, void *data)
448 {
449 struct sh_dmae_device *shdev = data;
450
451 if (!(dmaor_read(shdev) & DMAOR_AE))
452 return IRQ_NONE;
453
454 sh_dmae_reset(shdev);
455 return IRQ_HANDLED;
456 }
457 #endif
458
459 static bool sh_dmae_desc_completed(struct shdma_chan *schan,
460 struct shdma_desc *sdesc)
461 {
462 struct sh_dmae_chan *sh_chan = container_of(schan,
463 struct sh_dmae_chan, shdma_chan);
464 struct sh_dmae_desc *sh_desc = container_of(sdesc,
465 struct sh_dmae_desc, shdma_desc);
466 u32 sar_buf = sh_dmae_readl(sh_chan, SAR);
467 u32 dar_buf = sh_dmae_readl(sh_chan, DAR);
468
469 return (sdesc->direction == DMA_DEV_TO_MEM &&
470 (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) ||
471 (sdesc->direction != DMA_DEV_TO_MEM &&
472 (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf);
473 }
474
475 static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev)
476 {
477 /* Fast path out if NMIF is not asserted for this controller */
478 if ((dmaor_read(shdev) & DMAOR_NMIF) == 0)
479 return false;
480
481 return sh_dmae_reset(shdev);
482 }
483
484 static int sh_dmae_nmi_handler(struct notifier_block *self,
485 unsigned long cmd, void *data)
486 {
487 struct sh_dmae_device *shdev;
488 int ret = NOTIFY_DONE;
489 bool triggered;
490
491 /*
492 * Only concern ourselves with NMI events.
493 *
494 * Normally we would check the die chain value, but as this needs
495 * to be architecture independent, check for NMI context instead.
496 */
497 if (!in_nmi())
498 return NOTIFY_DONE;
499
500 rcu_read_lock();
501 list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) {
502 /*
503 * Only stop if one of the controllers has NMIF asserted,
504 * we do not want to interfere with regular address error
505 * handling or NMI events that don't concern the DMACs.
506 */
507 triggered = sh_dmae_nmi_notify(shdev);
508 if (triggered == true)
509 ret = NOTIFY_OK;
510 }
511 rcu_read_unlock();
512
513 return ret;
514 }
515
516 static struct notifier_block sh_dmae_nmi_notifier __read_mostly = {
517 .notifier_call = sh_dmae_nmi_handler,
518
519 /* Run before NMI debug handler and KGDB */
520 .priority = 1,
521 };
522
523 static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
524 int irq, unsigned long flags)
525 {
526 const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id];
527 struct shdma_dev *sdev = &shdev->shdma_dev;
528 struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev);
529 struct sh_dmae_chan *sh_chan;
530 struct shdma_chan *schan;
531 int err;
532
533 sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan),
534 GFP_KERNEL);
535 if (!sh_chan) {
536 dev_err(sdev->dma_dev.dev,
537 "No free memory for allocating dma channels!\n");
538 return -ENOMEM;
539 }
540
541 schan = &sh_chan->shdma_chan;
542 schan->max_xfer_len = SH_DMA_TCR_MAX + 1;
543
544 shdma_chan_probe(sdev, schan, id);
545
546 sh_chan->base = shdev->chan_reg + chan_pdata->offset;
547
548 /* set up channel irq */
549 if (pdev->id >= 0)
550 snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
551 "sh-dmae%d.%d", pdev->id, id);
552 else
553 snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id),
554 "sh-dma%d", id);
555
556 err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id);
557 if (err) {
558 dev_err(sdev->dma_dev.dev,
559 "DMA channel %d request_irq error %d\n",
560 id, err);
561 goto err_no_irq;
562 }
563
564 shdev->chan[id] = sh_chan;
565 return 0;
566
567 err_no_irq:
568 /* remove from dmaengine device node */
569 shdma_chan_remove(schan);
570 return err;
571 }
572
573 static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
574 {
575 struct shdma_chan *schan;
576 int i;
577
578 shdma_for_each_chan(schan, &shdev->shdma_dev, i) {
579 BUG_ON(!schan);
580
581 shdma_chan_remove(schan);
582 }
583 }
584
585 #ifdef CONFIG_PM
586 static int sh_dmae_runtime_suspend(struct device *dev)
587 {
588 struct sh_dmae_device *shdev = dev_get_drvdata(dev);
589
590 sh_dmae_ctl_stop(shdev);
591 return 0;
592 }
593
594 static int sh_dmae_runtime_resume(struct device *dev)
595 {
596 struct sh_dmae_device *shdev = dev_get_drvdata(dev);
597
598 return sh_dmae_rst(shdev);
599 }
600 #endif
601
602 #ifdef CONFIG_PM_SLEEP
603 static int sh_dmae_suspend(struct device *dev)
604 {
605 struct sh_dmae_device *shdev = dev_get_drvdata(dev);
606
607 sh_dmae_ctl_stop(shdev);
608 return 0;
609 }
610
611 static int sh_dmae_resume(struct device *dev)
612 {
613 struct sh_dmae_device *shdev = dev_get_drvdata(dev);
614 int i, ret;
615
616 ret = sh_dmae_rst(shdev);
617 if (ret < 0)
618 dev_err(dev, "Failed to reset!\n");
619
620 for (i = 0; i < shdev->pdata->channel_num; i++) {
621 struct sh_dmae_chan *sh_chan = shdev->chan[i];
622
623 if (!sh_chan->shdma_chan.desc_num)
624 continue;
625
626 if (sh_chan->shdma_chan.slave_id >= 0) {
627 const struct sh_dmae_slave_config *cfg = sh_chan->config;
628 dmae_set_dmars(sh_chan, cfg->mid_rid);
629 dmae_set_chcr(sh_chan, cfg->chcr);
630 } else {
631 dmae_init(sh_chan);
632 }
633 }
634
635 return 0;
636 }
637 #endif
638
639 static const struct dev_pm_ops sh_dmae_pm = {
640 SET_SYSTEM_SLEEP_PM_OPS(sh_dmae_suspend, sh_dmae_resume)
641 SET_RUNTIME_PM_OPS(sh_dmae_runtime_suspend, sh_dmae_runtime_resume,
642 NULL)
643 };
644
645 static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan)
646 {
647 struct sh_dmae_chan *sh_chan = container_of(schan,
648 struct sh_dmae_chan, shdma_chan);
649
650 /*
651 * Implicit BUG_ON(!sh_chan->config)
652 * This is an exclusive slave DMA operation, may only be called after a
653 * successful slave configuration.
654 */
655 return sh_chan->slave_addr;
656 }
657
658 static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i)
659 {
660 return &((struct sh_dmae_desc *)buf)[i].shdma_desc;
661 }
662
663 static const struct shdma_ops sh_dmae_shdma_ops = {
664 .desc_completed = sh_dmae_desc_completed,
665 .halt_channel = sh_dmae_halt,
666 .channel_busy = sh_dmae_channel_busy,
667 .slave_addr = sh_dmae_slave_addr,
668 .desc_setup = sh_dmae_desc_setup,
669 .set_slave = sh_dmae_set_slave,
670 .setup_xfer = sh_dmae_setup_xfer,
671 .start_xfer = sh_dmae_start_xfer,
672 .embedded_desc = sh_dmae_embedded_desc,
673 .chan_irq = sh_dmae_chan_irq,
674 .get_partial = sh_dmae_get_partial,
675 };
676
677 static const struct of_device_id sh_dmae_of_match[] = {
678 {.compatible = "renesas,shdma-r8a73a4", .data = r8a73a4_shdma_devid,},
679 {}
680 };
681 MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
682
683 static int sh_dmae_probe(struct platform_device *pdev)
684 {
685 const enum dma_slave_buswidth widths =
686 DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES |
687 DMA_SLAVE_BUSWIDTH_4_BYTES | DMA_SLAVE_BUSWIDTH_8_BYTES |
688 DMA_SLAVE_BUSWIDTH_16_BYTES | DMA_SLAVE_BUSWIDTH_32_BYTES;
689 const struct sh_dmae_pdata *pdata;
690 unsigned long chan_flag[SH_DMAE_MAX_CHANNELS] = {};
691 int chan_irq[SH_DMAE_MAX_CHANNELS];
692 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
693 unsigned long irqflags = 0;
694 int errirq;
695 #endif
696 int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0;
697 struct sh_dmae_device *shdev;
698 struct dma_device *dma_dev;
699 struct resource *chan, *dmars, *errirq_res, *chanirq_res;
700
701 if (pdev->dev.of_node)
702 pdata = of_match_device(sh_dmae_of_match, &pdev->dev)->data;
703 else
704 pdata = dev_get_platdata(&pdev->dev);
705
706 /* get platform data */
707 if (!pdata || !pdata->channel_num)
708 return -ENODEV;
709
710 chan = platform_get_resource(pdev, IORESOURCE_MEM, 0);
711 /* DMARS area is optional */
712 dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1);
713 /*
714 * IRQ resources:
715 * 1. there always must be at least one IRQ IO-resource. On SH4 it is
716 * the error IRQ, in which case it is the only IRQ in this resource:
717 * start == end. If it is the only IRQ resource, all channels also
718 * use the same IRQ.
719 * 2. DMA channel IRQ resources can be specified one per resource or in
720 * ranges (start != end)
721 * 3. iff all events (channels and, optionally, error) on this
722 * controller use the same IRQ, only one IRQ resource can be
723 * specified, otherwise there must be one IRQ per channel, even if
724 * some of them are equal
725 * 4. if all IRQs on this controller are equal or if some specific IRQs
726 * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be
727 * requested with the IRQF_SHARED flag
728 */
729 errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
730 if (!chan || !errirq_res)
731 return -ENODEV;
732
733 shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device),
734 GFP_KERNEL);
735 if (!shdev) {
736 dev_err(&pdev->dev, "Not enough memory\n");
737 return -ENOMEM;
738 }
739
740 dma_dev = &shdev->shdma_dev.dma_dev;
741
742 shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan);
743 if (IS_ERR(shdev->chan_reg))
744 return PTR_ERR(shdev->chan_reg);
745 if (dmars) {
746 shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars);
747 if (IS_ERR(shdev->dmars))
748 return PTR_ERR(shdev->dmars);
749 }
750
751 dma_dev->src_addr_widths = widths;
752 dma_dev->dst_addr_widths = widths;
753 dma_dev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM);
754 dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
755
756 if (!pdata->slave_only)
757 dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
758 if (pdata->slave && pdata->slave_num)
759 dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
760
761 /* Default transfer size of 32 bytes requires 32-byte alignment */
762 dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
763
764 shdev->shdma_dev.ops = &sh_dmae_shdma_ops;
765 shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc);
766 err = shdma_init(&pdev->dev, &shdev->shdma_dev,
767 pdata->channel_num);
768 if (err < 0)
769 goto eshdma;
770
771 /* platform data */
772 shdev->pdata = pdata;
773
774 if (pdata->chcr_offset)
775 shdev->chcr_offset = pdata->chcr_offset;
776 else
777 shdev->chcr_offset = CHCR;
778
779 if (pdata->chcr_ie_bit)
780 shdev->chcr_ie_bit = pdata->chcr_ie_bit;
781 else
782 shdev->chcr_ie_bit = CHCR_IE;
783
784 platform_set_drvdata(pdev, shdev);
785
786 pm_runtime_enable(&pdev->dev);
787 err = pm_runtime_get_sync(&pdev->dev);
788 if (err < 0)
789 dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err);
790
791 spin_lock_irq(&sh_dmae_lock);
792 list_add_tail_rcu(&shdev->node, &sh_dmae_devices);
793 spin_unlock_irq(&sh_dmae_lock);
794
795 /* reset dma controller - only needed as a test */
796 err = sh_dmae_rst(shdev);
797 if (err)
798 goto rst_err;
799
800 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
801 chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
802
803 if (!chanirq_res)
804 chanirq_res = errirq_res;
805 else
806 irqres++;
807
808 if (chanirq_res == errirq_res ||
809 (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE)
810 irqflags = IRQF_SHARED;
811
812 errirq = errirq_res->start;
813
814 err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags,
815 "DMAC Address Error", shdev);
816 if (err) {
817 dev_err(&pdev->dev,
818 "DMA failed requesting irq #%d, error %d\n",
819 errirq, err);
820 goto eirq_err;
821 }
822
823 #else
824 chanirq_res = errirq_res;
825 #endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */
826
827 if (chanirq_res->start == chanirq_res->end &&
828 !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) {
829 /* Special case - all multiplexed */
830 for (; irq_cnt < pdata->channel_num; irq_cnt++) {
831 if (irq_cnt < SH_DMAE_MAX_CHANNELS) {
832 chan_irq[irq_cnt] = chanirq_res->start;
833 chan_flag[irq_cnt] = IRQF_SHARED;
834 } else {
835 irq_cap = 1;
836 break;
837 }
838 }
839 } else {
840 do {
841 for (i = chanirq_res->start; i <= chanirq_res->end; i++) {
842 if (irq_cnt >= SH_DMAE_MAX_CHANNELS) {
843 irq_cap = 1;
844 break;
845 }
846
847 if ((errirq_res->flags & IORESOURCE_BITS) ==
848 IORESOURCE_IRQ_SHAREABLE)
849 chan_flag[irq_cnt] = IRQF_SHARED;
850 else
851 chan_flag[irq_cnt] = 0;
852 dev_dbg(&pdev->dev,
853 "Found IRQ %d for channel %d\n",
854 i, irq_cnt);
855 chan_irq[irq_cnt++] = i;
856 }
857
858 if (irq_cnt >= SH_DMAE_MAX_CHANNELS)
859 break;
860
861 chanirq_res = platform_get_resource(pdev,
862 IORESOURCE_IRQ, ++irqres);
863 } while (irq_cnt < pdata->channel_num && chanirq_res);
864 }
865
866 /* Create DMA Channel */
867 for (i = 0; i < irq_cnt; i++) {
868 err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]);
869 if (err)
870 goto chan_probe_err;
871 }
872
873 if (irq_cap)
874 dev_notice(&pdev->dev, "Attempting to register %d DMA "
875 "channels when a maximum of %d are supported.\n",
876 pdata->channel_num, SH_DMAE_MAX_CHANNELS);
877
878 pm_runtime_put(&pdev->dev);
879
880 err = dma_async_device_register(&shdev->shdma_dev.dma_dev);
881 if (err < 0)
882 goto edmadevreg;
883
884 return err;
885
886 edmadevreg:
887 pm_runtime_get(&pdev->dev);
888
889 chan_probe_err:
890 sh_dmae_chan_remove(shdev);
891
892 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
893 eirq_err:
894 #endif
895 rst_err:
896 spin_lock_irq(&sh_dmae_lock);
897 list_del_rcu(&shdev->node);
898 spin_unlock_irq(&sh_dmae_lock);
899
900 pm_runtime_put(&pdev->dev);
901 pm_runtime_disable(&pdev->dev);
902
903 shdma_cleanup(&shdev->shdma_dev);
904 eshdma:
905 synchronize_rcu();
906
907 return err;
908 }
909
910 static int sh_dmae_remove(struct platform_device *pdev)
911 {
912 struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
913 struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
914
915 dma_async_device_unregister(dma_dev);
916
917 spin_lock_irq(&sh_dmae_lock);
918 list_del_rcu(&shdev->node);
919 spin_unlock_irq(&sh_dmae_lock);
920
921 pm_runtime_disable(&pdev->dev);
922
923 sh_dmae_chan_remove(shdev);
924 shdma_cleanup(&shdev->shdma_dev);
925
926 synchronize_rcu();
927
928 return 0;
929 }
930
931 static struct platform_driver sh_dmae_driver = {
932 .driver = {
933 .pm = &sh_dmae_pm,
934 .name = SH_DMAE_DRV_NAME,
935 .of_match_table = sh_dmae_of_match,
936 },
937 .remove = sh_dmae_remove,
938 };
939
940 static int __init sh_dmae_init(void)
941 {
942 /* Wire up NMI handling */
943 int err = register_die_notifier(&sh_dmae_nmi_notifier);
944 if (err)
945 return err;
946
947 return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);
948 }
949 module_init(sh_dmae_init);
950
951 static void __exit sh_dmae_exit(void)
952 {
953 platform_driver_unregister(&sh_dmae_driver);
954
955 unregister_die_notifier(&sh_dmae_nmi_notifier);
956 }
957 module_exit(sh_dmae_exit);
958
959 MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>");
960 MODULE_DESCRIPTION("Renesas SH DMA Engine driver");
961 MODULE_LICENSE("GPL");
962 MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME);
Linux with added FPC-III support