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8#include <linux/clk.h>
9#include <linux/iopoll.h>
10#include <linux/module.h>
11#include <linux/of_device.h>
12#include <linux/of_dma.h>
13#include <linux/of_irq.h>
14#include <linux/pm_runtime.h>
15#include <linux/slab.h>
16
17#include "virt-dma.h"
18
19#define ADMA_CH_CMD 0x00
20#define ADMA_CH_STATUS 0x0c
21#define ADMA_CH_STATUS_XFER_EN BIT(0)
22#define ADMA_CH_STATUS_XFER_PAUSED BIT(1)
23
24#define ADMA_CH_INT_STATUS 0x10
25#define ADMA_CH_INT_STATUS_XFER_DONE BIT(0)
26
27#define ADMA_CH_INT_CLEAR 0x1c
28#define ADMA_CH_CTRL 0x24
29#define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12)
30#define ADMA_CH_CTRL_DIR_AHUB2MEM 2
31#define ADMA_CH_CTRL_DIR_MEM2AHUB 4
32#define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8)
33#define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1)
34#define ADMA_CH_CTRL_XFER_PAUSE_SHIFT 0
35
36#define ADMA_CH_CONFIG 0x28
37#define ADMA_CH_CONFIG_SRC_BUF(val) (((val) & 0x7) << 28)
38#define ADMA_CH_CONFIG_TRG_BUF(val) (((val) & 0x7) << 24)
39#define ADMA_CH_CONFIG_BURST_SIZE_SHIFT 20
40#define ADMA_CH_CONFIG_MAX_BURST_SIZE 16
41#define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf)
42#define ADMA_CH_CONFIG_MAX_BUFS 8
43#define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) (reqs << 4)
44
45#define ADMA_CH_FIFO_CTRL 0x2c
46#define TEGRA210_ADMA_CH_FIFO_CTRL_TXSIZE(val) (((val) & 0xf) << 8)
47#define TEGRA210_ADMA_CH_FIFO_CTRL_RXSIZE(val) ((val) & 0xf)
48#define TEGRA186_ADMA_CH_FIFO_CTRL_TXSIZE(val) (((val) & 0x1f) << 8)
49#define TEGRA186_ADMA_CH_FIFO_CTRL_RXSIZE(val) ((val) & 0x1f)
50
51#define ADMA_CH_LOWER_SRC_ADDR 0x34
52#define ADMA_CH_LOWER_TRG_ADDR 0x3c
53#define ADMA_CH_TC 0x44
54#define ADMA_CH_TC_COUNT_MASK 0x3ffffffc
55
56#define ADMA_CH_XFER_STATUS 0x54
57#define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff
58
59#define ADMA_GLOBAL_CMD 0x00
60#define ADMA_GLOBAL_SOFT_RESET 0x04
61
62#define TEGRA_ADMA_BURST_COMPLETE_TIME 20
63
64#define TEGRA210_FIFO_CTRL_DEFAULT (TEGRA210_ADMA_CH_FIFO_CTRL_TXSIZE(3) | \
65 TEGRA210_ADMA_CH_FIFO_CTRL_RXSIZE(3))
66
67#define TEGRA186_FIFO_CTRL_DEFAULT (TEGRA186_ADMA_CH_FIFO_CTRL_TXSIZE(3) | \
68 TEGRA186_ADMA_CH_FIFO_CTRL_RXSIZE(3))
69
70#define ADMA_CH_REG_FIELD_VAL(val, mask, shift) (((val) & mask) << shift)
71
72struct tegra_adma;
73
74
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86
87
88struct tegra_adma_chip_data {
89 unsigned int (*adma_get_burst_config)(unsigned int burst_size);
90 unsigned int global_reg_offset;
91 unsigned int global_int_clear;
92 unsigned int ch_req_tx_shift;
93 unsigned int ch_req_rx_shift;
94 unsigned int ch_base_offset;
95 unsigned int ch_fifo_ctrl;
96 unsigned int ch_req_mask;
97 unsigned int ch_req_max;
98 unsigned int ch_reg_size;
99 unsigned int nr_channels;
100 bool has_outstanding_reqs;
101};
102
103
104
105
106struct tegra_adma_chan_regs {
107 unsigned int ctrl;
108 unsigned int config;
109 unsigned int src_addr;
110 unsigned int trg_addr;
111 unsigned int fifo_ctrl;
112 unsigned int cmd;
113 unsigned int tc;
114};
115
116
117
118
119struct tegra_adma_desc {
120 struct virt_dma_desc vd;
121 struct tegra_adma_chan_regs ch_regs;
122 size_t buf_len;
123 size_t period_len;
124 size_t num_periods;
125};
126
127
128
129
130struct tegra_adma_chan {
131 struct virt_dma_chan vc;
132 struct tegra_adma_desc *desc;
133 struct tegra_adma *tdma;
134 int irq;
135 void __iomem *chan_addr;
136
137
138 struct dma_slave_config sconfig;
139 enum dma_transfer_direction sreq_dir;
140 unsigned int sreq_index;
141 bool sreq_reserved;
142 struct tegra_adma_chan_regs ch_regs;
143
144
145 unsigned int tx_buf_count;
146 unsigned int tx_buf_pos;
147};
148
149
150
151
152struct tegra_adma {
153 struct dma_device dma_dev;
154 struct device *dev;
155 void __iomem *base_addr;
156 struct clk *ahub_clk;
157 unsigned int nr_channels;
158 unsigned long rx_requests_reserved;
159 unsigned long tx_requests_reserved;
160
161
162 unsigned int global_cmd;
163
164 const struct tegra_adma_chip_data *cdata;
165
166
167 struct tegra_adma_chan channels[];
168};
169
170static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
171{
172 writel(val, tdma->base_addr + tdma->cdata->global_reg_offset + reg);
173}
174
175static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
176{
177 return readl(tdma->base_addr + tdma->cdata->global_reg_offset + reg);
178}
179
180static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
181{
182 writel(val, tdc->chan_addr + reg);
183}
184
185static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
186{
187 return readl(tdc->chan_addr + reg);
188}
189
190static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc)
191{
192 return container_of(dc, struct tegra_adma_chan, vc.chan);
193}
194
195static inline struct tegra_adma_desc *to_tegra_adma_desc(
196 struct dma_async_tx_descriptor *td)
197{
198 return container_of(td, struct tegra_adma_desc, vd.tx);
199}
200
201static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
202{
203 return tdc->tdma->dev;
204}
205
206static void tegra_adma_desc_free(struct virt_dma_desc *vd)
207{
208 kfree(container_of(vd, struct tegra_adma_desc, vd));
209}
210
211static int tegra_adma_slave_config(struct dma_chan *dc,
212 struct dma_slave_config *sconfig)
213{
214 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
215
216 memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig));
217
218 return 0;
219}
220
221static int tegra_adma_init(struct tegra_adma *tdma)
222{
223 u32 status;
224 int ret;
225
226
227 tdma_write(tdma, tdma->cdata->global_int_clear, 0x1);
228
229
230 tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
231
232
233 ret = readx_poll_timeout(readl,
234 tdma->base_addr +
235 tdma->cdata->global_reg_offset +
236 ADMA_GLOBAL_SOFT_RESET,
237 status, status == 0, 20, 10000);
238 if (ret)
239 return ret;
240
241
242 tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
243
244 return 0;
245}
246
247static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
248 enum dma_transfer_direction direction)
249{
250 struct tegra_adma *tdma = tdc->tdma;
251 unsigned int sreq_index = tdc->sreq_index;
252
253 if (tdc->sreq_reserved)
254 return tdc->sreq_dir == direction ? 0 : -EINVAL;
255
256 if (sreq_index > tdma->cdata->ch_req_max) {
257 dev_err(tdma->dev, "invalid DMA request\n");
258 return -EINVAL;
259 }
260
261 switch (direction) {
262 case DMA_MEM_TO_DEV:
263 if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
264 dev_err(tdma->dev, "DMA request reserved\n");
265 return -EINVAL;
266 }
267 break;
268
269 case DMA_DEV_TO_MEM:
270 if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
271 dev_err(tdma->dev, "DMA request reserved\n");
272 return -EINVAL;
273 }
274 break;
275
276 default:
277 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
278 dma_chan_name(&tdc->vc.chan));
279 return -EINVAL;
280 }
281
282 tdc->sreq_dir = direction;
283 tdc->sreq_reserved = true;
284
285 return 0;
286}
287
288static void tegra_adma_request_free(struct tegra_adma_chan *tdc)
289{
290 struct tegra_adma *tdma = tdc->tdma;
291
292 if (!tdc->sreq_reserved)
293 return;
294
295 switch (tdc->sreq_dir) {
296 case DMA_MEM_TO_DEV:
297 clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved);
298 break;
299
300 case DMA_DEV_TO_MEM:
301 clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved);
302 break;
303
304 default:
305 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
306 dma_chan_name(&tdc->vc.chan));
307 return;
308 }
309
310 tdc->sreq_reserved = false;
311}
312
313static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc)
314{
315 u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS);
316
317 return status & ADMA_CH_INT_STATUS_XFER_DONE;
318}
319
320static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc)
321{
322 u32 status = tegra_adma_irq_status(tdc);
323
324 if (status)
325 tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status);
326
327 return status;
328}
329
330static void tegra_adma_stop(struct tegra_adma_chan *tdc)
331{
332 unsigned int status;
333
334
335 tdma_ch_write(tdc, ADMA_CH_CMD, 0);
336
337
338 tegra_adma_irq_clear(tdc);
339
340 if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS,
341 status, !(status & ADMA_CH_STATUS_XFER_EN),
342 20, 10000)) {
343 dev_err(tdc2dev(tdc), "unable to stop DMA channel\n");
344 return;
345 }
346
347 kfree(tdc->desc);
348 tdc->desc = NULL;
349}
350
351static void tegra_adma_start(struct tegra_adma_chan *tdc)
352{
353 struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc);
354 struct tegra_adma_chan_regs *ch_regs;
355 struct tegra_adma_desc *desc;
356
357 if (!vd)
358 return;
359
360 list_del(&vd->node);
361
362 desc = to_tegra_adma_desc(&vd->tx);
363
364 if (!desc) {
365 dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n");
366 return;
367 }
368
369 ch_regs = &desc->ch_regs;
370
371 tdc->tx_buf_pos = 0;
372 tdc->tx_buf_count = 0;
373 tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc);
374 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
375 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr);
376 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr);
377 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl);
378 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
379
380
381 tdma_ch_write(tdc, ADMA_CH_CMD, 1);
382
383 tdc->desc = desc;
384}
385
386static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc)
387{
388 struct tegra_adma_desc *desc = tdc->desc;
389 unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1;
390 unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS);
391 unsigned int periods_remaining;
392
393
394
395
396 if (pos < tdc->tx_buf_pos)
397 tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos);
398 else
399 tdc->tx_buf_count += pos - tdc->tx_buf_pos;
400
401 periods_remaining = tdc->tx_buf_count % desc->num_periods;
402 tdc->tx_buf_pos = pos;
403
404 return desc->buf_len - (periods_remaining * desc->period_len);
405}
406
407static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
408{
409 struct tegra_adma_chan *tdc = dev_id;
410 unsigned long status;
411
412 spin_lock(&tdc->vc.lock);
413
414 status = tegra_adma_irq_clear(tdc);
415 if (status == 0 || !tdc->desc) {
416 spin_unlock(&tdc->vc.lock);
417 return IRQ_NONE;
418 }
419
420 vchan_cyclic_callback(&tdc->desc->vd);
421
422 spin_unlock(&tdc->vc.lock);
423
424 return IRQ_HANDLED;
425}
426
427static void tegra_adma_issue_pending(struct dma_chan *dc)
428{
429 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
430 unsigned long flags;
431
432 spin_lock_irqsave(&tdc->vc.lock, flags);
433
434 if (vchan_issue_pending(&tdc->vc)) {
435 if (!tdc->desc)
436 tegra_adma_start(tdc);
437 }
438
439 spin_unlock_irqrestore(&tdc->vc.lock, flags);
440}
441
442static bool tegra_adma_is_paused(struct tegra_adma_chan *tdc)
443{
444 u32 csts;
445
446 csts = tdma_ch_read(tdc, ADMA_CH_STATUS);
447 csts &= ADMA_CH_STATUS_XFER_PAUSED;
448
449 return csts ? true : false;
450}
451
452static int tegra_adma_pause(struct dma_chan *dc)
453{
454 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
455 struct tegra_adma_desc *desc = tdc->desc;
456 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
457 int dcnt = 10;
458
459 ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
460 ch_regs->ctrl |= (1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
461 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
462
463 while (dcnt-- && !tegra_adma_is_paused(tdc))
464 udelay(TEGRA_ADMA_BURST_COMPLETE_TIME);
465
466 if (dcnt < 0) {
467 dev_err(tdc2dev(tdc), "unable to pause DMA channel\n");
468 return -EBUSY;
469 }
470
471 return 0;
472}
473
474static int tegra_adma_resume(struct dma_chan *dc)
475{
476 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
477 struct tegra_adma_desc *desc = tdc->desc;
478 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
479
480 ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
481 ch_regs->ctrl &= ~(1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
482 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
483
484 return 0;
485}
486
487static int tegra_adma_terminate_all(struct dma_chan *dc)
488{
489 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
490 unsigned long flags;
491 LIST_HEAD(head);
492
493 spin_lock_irqsave(&tdc->vc.lock, flags);
494
495 if (tdc->desc)
496 tegra_adma_stop(tdc);
497
498 tegra_adma_request_free(tdc);
499 vchan_get_all_descriptors(&tdc->vc, &head);
500 spin_unlock_irqrestore(&tdc->vc.lock, flags);
501 vchan_dma_desc_free_list(&tdc->vc, &head);
502
503 return 0;
504}
505
506static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
507 dma_cookie_t cookie,
508 struct dma_tx_state *txstate)
509{
510 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
511 struct tegra_adma_desc *desc;
512 struct virt_dma_desc *vd;
513 enum dma_status ret;
514 unsigned long flags;
515 unsigned int residual;
516
517 ret = dma_cookie_status(dc, cookie, txstate);
518 if (ret == DMA_COMPLETE || !txstate)
519 return ret;
520
521 spin_lock_irqsave(&tdc->vc.lock, flags);
522
523 vd = vchan_find_desc(&tdc->vc, cookie);
524 if (vd) {
525 desc = to_tegra_adma_desc(&vd->tx);
526 residual = desc->ch_regs.tc;
527 } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
528 residual = tegra_adma_get_residue(tdc);
529 } else {
530 residual = 0;
531 }
532
533 spin_unlock_irqrestore(&tdc->vc.lock, flags);
534
535 dma_set_residue(txstate, residual);
536
537 return ret;
538}
539
540static unsigned int tegra210_adma_get_burst_config(unsigned int burst_size)
541{
542 if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
543 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
544
545 return fls(burst_size) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
546}
547
548static unsigned int tegra186_adma_get_burst_config(unsigned int burst_size)
549{
550 if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
551 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
552
553 return (burst_size - 1) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
554}
555
556static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
557 struct tegra_adma_desc *desc,
558 dma_addr_t buf_addr,
559 enum dma_transfer_direction direction)
560{
561 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
562 const struct tegra_adma_chip_data *cdata = tdc->tdma->cdata;
563 unsigned int burst_size, adma_dir;
564
565 if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
566 return -EINVAL;
567
568 switch (direction) {
569 case DMA_MEM_TO_DEV:
570 adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
571 burst_size = tdc->sconfig.dst_maxburst;
572 ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
573 ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
574 cdata->ch_req_mask,
575 cdata->ch_req_tx_shift);
576 ch_regs->src_addr = buf_addr;
577 break;
578
579 case DMA_DEV_TO_MEM:
580 adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
581 burst_size = tdc->sconfig.src_maxburst;
582 ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
583 ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
584 cdata->ch_req_mask,
585 cdata->ch_req_rx_shift);
586 ch_regs->trg_addr = buf_addr;
587 break;
588
589 default:
590 dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
591 return -EINVAL;
592 }
593
594 ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) |
595 ADMA_CH_CTRL_MODE_CONTINUOUS |
596 ADMA_CH_CTRL_FLOWCTRL_EN;
597 ch_regs->config |= cdata->adma_get_burst_config(burst_size);
598 ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1);
599 if (cdata->has_outstanding_reqs)
600 ch_regs->config |= TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(8);
601 ch_regs->fifo_ctrl = cdata->ch_fifo_ctrl;
602 ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
603
604 return tegra_adma_request_alloc(tdc, direction);
605}
606
607static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
608 struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
609 size_t period_len, enum dma_transfer_direction direction,
610 unsigned long flags)
611{
612 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
613 struct tegra_adma_desc *desc = NULL;
614
615 if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
616 dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
617 return NULL;
618 }
619
620 if (buf_len % period_len) {
621 dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
622 return NULL;
623 }
624
625 if (!IS_ALIGNED(buf_addr, 4)) {
626 dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
627 return NULL;
628 }
629
630 desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
631 if (!desc)
632 return NULL;
633
634 desc->buf_len = buf_len;
635 desc->period_len = period_len;
636 desc->num_periods = buf_len / period_len;
637
638 if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
639 kfree(desc);
640 return NULL;
641 }
642
643 return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
644}
645
646static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
647{
648 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
649 int ret;
650
651 ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
652 if (ret) {
653 dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
654 dma_chan_name(dc));
655 return ret;
656 }
657
658 ret = pm_runtime_resume_and_get(tdc2dev(tdc));
659 if (ret < 0) {
660 free_irq(tdc->irq, tdc);
661 return ret;
662 }
663
664 dma_cookie_init(&tdc->vc.chan);
665
666 return 0;
667}
668
669static void tegra_adma_free_chan_resources(struct dma_chan *dc)
670{
671 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
672
673 tegra_adma_terminate_all(dc);
674 vchan_free_chan_resources(&tdc->vc);
675 tasklet_kill(&tdc->vc.task);
676 free_irq(tdc->irq, tdc);
677 pm_runtime_put(tdc2dev(tdc));
678
679 tdc->sreq_index = 0;
680 tdc->sreq_dir = DMA_TRANS_NONE;
681}
682
683static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
684 struct of_dma *ofdma)
685{
686 struct tegra_adma *tdma = ofdma->of_dma_data;
687 struct tegra_adma_chan *tdc;
688 struct dma_chan *chan;
689 unsigned int sreq_index;
690
691 if (dma_spec->args_count != 1)
692 return NULL;
693
694 sreq_index = dma_spec->args[0];
695
696 if (sreq_index == 0) {
697 dev_err(tdma->dev, "DMA request must not be 0\n");
698 return NULL;
699 }
700
701 chan = dma_get_any_slave_channel(&tdma->dma_dev);
702 if (!chan)
703 return NULL;
704
705 tdc = to_tegra_adma_chan(chan);
706 tdc->sreq_index = sreq_index;
707
708 return chan;
709}
710
711static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev)
712{
713 struct tegra_adma *tdma = dev_get_drvdata(dev);
714 struct tegra_adma_chan_regs *ch_reg;
715 struct tegra_adma_chan *tdc;
716 int i;
717
718 tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
719 if (!tdma->global_cmd)
720 goto clk_disable;
721
722 for (i = 0; i < tdma->nr_channels; i++) {
723 tdc = &tdma->channels[i];
724 ch_reg = &tdc->ch_regs;
725 ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD);
726
727 if (!ch_reg->cmd)
728 continue;
729 ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC);
730 ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR);
731 ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR);
732 ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
733 ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL);
734 ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG);
735 }
736
737clk_disable:
738 clk_disable_unprepare(tdma->ahub_clk);
739
740 return 0;
741}
742
743static int __maybe_unused tegra_adma_runtime_resume(struct device *dev)
744{
745 struct tegra_adma *tdma = dev_get_drvdata(dev);
746 struct tegra_adma_chan_regs *ch_reg;
747 struct tegra_adma_chan *tdc;
748 int ret, i;
749
750 ret = clk_prepare_enable(tdma->ahub_clk);
751 if (ret) {
752 dev_err(dev, "ahub clk_enable failed: %d\n", ret);
753 return ret;
754 }
755 tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
756
757 if (!tdma->global_cmd)
758 return 0;
759
760 for (i = 0; i < tdma->nr_channels; i++) {
761 tdc = &tdma->channels[i];
762 ch_reg = &tdc->ch_regs;
763
764 if (!ch_reg->cmd)
765 continue;
766 tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc);
767 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr);
768 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr);
769 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl);
770 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl);
771 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config);
772 tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd);
773 }
774
775 return 0;
776}
777
778static const struct tegra_adma_chip_data tegra210_chip_data = {
779 .adma_get_burst_config = tegra210_adma_get_burst_config,
780 .global_reg_offset = 0xc00,
781 .global_int_clear = 0x20,
782 .ch_req_tx_shift = 28,
783 .ch_req_rx_shift = 24,
784 .ch_base_offset = 0,
785 .has_outstanding_reqs = false,
786 .ch_fifo_ctrl = TEGRA210_FIFO_CTRL_DEFAULT,
787 .ch_req_mask = 0xf,
788 .ch_req_max = 10,
789 .ch_reg_size = 0x80,
790 .nr_channels = 22,
791};
792
793static const struct tegra_adma_chip_data tegra186_chip_data = {
794 .adma_get_burst_config = tegra186_adma_get_burst_config,
795 .global_reg_offset = 0,
796 .global_int_clear = 0x402c,
797 .ch_req_tx_shift = 27,
798 .ch_req_rx_shift = 22,
799 .ch_base_offset = 0x10000,
800 .has_outstanding_reqs = true,
801 .ch_fifo_ctrl = TEGRA186_FIFO_CTRL_DEFAULT,
802 .ch_req_mask = 0x1f,
803 .ch_req_max = 20,
804 .ch_reg_size = 0x100,
805 .nr_channels = 32,
806};
807
808static const struct of_device_id tegra_adma_of_match[] = {
809 { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
810 { .compatible = "nvidia,tegra186-adma", .data = &tegra186_chip_data },
811 { },
812};
813MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
814
815static int tegra_adma_probe(struct platform_device *pdev)
816{
817 const struct tegra_adma_chip_data *cdata;
818 struct tegra_adma *tdma;
819 struct resource *res;
820 int ret, i;
821
822 cdata = of_device_get_match_data(&pdev->dev);
823 if (!cdata) {
824 dev_err(&pdev->dev, "device match data not found\n");
825 return -ENODEV;
826 }
827
828 tdma = devm_kzalloc(&pdev->dev,
829 struct_size(tdma, channels, cdata->nr_channels),
830 GFP_KERNEL);
831 if (!tdma)
832 return -ENOMEM;
833
834 tdma->dev = &pdev->dev;
835 tdma->cdata = cdata;
836 tdma->nr_channels = cdata->nr_channels;
837 platform_set_drvdata(pdev, tdma);
838
839 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
840 tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
841 if (IS_ERR(tdma->base_addr))
842 return PTR_ERR(tdma->base_addr);
843
844 tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio");
845 if (IS_ERR(tdma->ahub_clk)) {
846 dev_err(&pdev->dev, "Error: Missing ahub controller clock\n");
847 return PTR_ERR(tdma->ahub_clk);
848 }
849
850 INIT_LIST_HEAD(&tdma->dma_dev.channels);
851 for (i = 0; i < tdma->nr_channels; i++) {
852 struct tegra_adma_chan *tdc = &tdma->channels[i];
853
854 tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
855 + (cdata->ch_reg_size * i);
856
857 tdc->irq = of_irq_get(pdev->dev.of_node, i);
858 if (tdc->irq <= 0) {
859 ret = tdc->irq ?: -ENXIO;
860 goto irq_dispose;
861 }
862
863 vchan_init(&tdc->vc, &tdma->dma_dev);
864 tdc->vc.desc_free = tegra_adma_desc_free;
865 tdc->tdma = tdma;
866 }
867
868 pm_runtime_enable(&pdev->dev);
869
870 ret = pm_runtime_get_sync(&pdev->dev);
871 if (ret < 0)
872 goto rpm_disable;
873
874 ret = tegra_adma_init(tdma);
875 if (ret)
876 goto rpm_put;
877
878 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
879 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
880 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
881
882 tdma->dma_dev.dev = &pdev->dev;
883 tdma->dma_dev.device_alloc_chan_resources =
884 tegra_adma_alloc_chan_resources;
885 tdma->dma_dev.device_free_chan_resources =
886 tegra_adma_free_chan_resources;
887 tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
888 tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
889 tdma->dma_dev.device_config = tegra_adma_slave_config;
890 tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
891 tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
892 tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
893 tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
894 tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
895 tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
896 tdma->dma_dev.device_pause = tegra_adma_pause;
897 tdma->dma_dev.device_resume = tegra_adma_resume;
898
899 ret = dma_async_device_register(&tdma->dma_dev);
900 if (ret < 0) {
901 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
902 goto rpm_put;
903 }
904
905 ret = of_dma_controller_register(pdev->dev.of_node,
906 tegra_dma_of_xlate, tdma);
907 if (ret < 0) {
908 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
909 goto dma_remove;
910 }
911
912 pm_runtime_put(&pdev->dev);
913
914 dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
915 tdma->nr_channels);
916
917 return 0;
918
919dma_remove:
920 dma_async_device_unregister(&tdma->dma_dev);
921rpm_put:
922 pm_runtime_put_sync(&pdev->dev);
923rpm_disable:
924 pm_runtime_disable(&pdev->dev);
925irq_dispose:
926 while (--i >= 0)
927 irq_dispose_mapping(tdma->channels[i].irq);
928
929 return ret;
930}
931
932static int tegra_adma_remove(struct platform_device *pdev)
933{
934 struct tegra_adma *tdma = platform_get_drvdata(pdev);
935 int i;
936
937 of_dma_controller_free(pdev->dev.of_node);
938 dma_async_device_unregister(&tdma->dma_dev);
939
940 for (i = 0; i < tdma->nr_channels; ++i)
941 irq_dispose_mapping(tdma->channels[i].irq);
942
943 pm_runtime_put_sync(&pdev->dev);
944 pm_runtime_disable(&pdev->dev);
945
946 return 0;
947}
948
949static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
950 SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
951 tegra_adma_runtime_resume, NULL)
952 SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
953 pm_runtime_force_resume)
954};
955
956static struct platform_driver tegra_admac_driver = {
957 .driver = {
958 .name = "tegra-adma",
959 .pm = &tegra_adma_dev_pm_ops,
960 .of_match_table = tegra_adma_of_match,
961 },
962 .probe = tegra_adma_probe,
963 .remove = tegra_adma_remove,
964};
965
966module_platform_driver(tegra_admac_driver);
967
968MODULE_ALIAS("platform:tegra210-adma");
969MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
970MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
971MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
972MODULE_LICENSE("GPL v2");
973
