xref: /linux/drivers/dma/tegra210-adma.c (revision 0ad53fe3ae82443c74ff8cfd7bd13377cc1134a3)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ADMA driver for Nvidia's Tegra210 ADMA controller.
4  *
5  * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
6  */
7 
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 
72 struct tegra_adma;
73 
74 /*
75  * struct tegra_adma_chip_data - Tegra chip specific data
76  * @global_reg_offset: Register offset of DMA global register.
77  * @global_int_clear: Register offset of DMA global interrupt clear.
78  * @ch_req_tx_shift: Register offset for AHUB transmit channel select.
79  * @ch_req_rx_shift: Register offset for AHUB receive channel select.
80  * @ch_base_offset: Register offset of DMA channel registers.
81  * @has_outstanding_reqs: If DMA channel can have outstanding requests.
82  * @ch_fifo_ctrl: Default value for channel FIFO CTRL register.
83  * @ch_req_mask: Mask for Tx or Rx channel select.
84  * @ch_req_max: Maximum number of Tx or Rx channels available.
85  * @ch_reg_size: Size of DMA channel register space.
86  * @nr_channels: Number of DMA channels available.
87  */
88 struct 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  * struct tegra_adma_chan_regs - Tegra ADMA channel registers
105  */
106 struct 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  * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests.
118  */
119 struct 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  * struct tegra_adma_chan - Tegra ADMA channel information
129  */
130 struct 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 	/* Slave channel configuration info */
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 	/* Transfer count and position info */
145 	unsigned int			tx_buf_count;
146 	unsigned int			tx_buf_pos;
147 };
148 
149 /*
150  * struct tegra_adma - Tegra ADMA controller information
151  */
152 struct 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 	/* Used to store global command register state when suspending */
162 	unsigned int			global_cmd;
163 
164 	const struct tegra_adma_chip_data *cdata;
165 
166 	/* Last member of the structure */
167 	struct tegra_adma_chan		channels[];
168 };
169 
170 static 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 
175 static 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 
180 static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
181 {
182 	writel(val, tdc->chan_addr + reg);
183 }
184 
185 static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
186 {
187 	return readl(tdc->chan_addr + reg);
188 }
189 
190 static 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 
195 static 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 
201 static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
202 {
203 	return tdc->tdma->dev;
204 }
205 
206 static void tegra_adma_desc_free(struct virt_dma_desc *vd)
207 {
208 	kfree(container_of(vd, struct tegra_adma_desc, vd));
209 }
210 
211 static 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 
221 static int tegra_adma_init(struct tegra_adma *tdma)
222 {
223 	u32 status;
224 	int ret;
225 
226 	/* Clear any interrupts */
227 	tdma_write(tdma, tdma->cdata->global_int_clear, 0x1);
228 
229 	/* Assert soft reset */
230 	tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
231 
232 	/* Wait for reset to clear */
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 	/* Enable global ADMA registers */
242 	tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
243 
244 	return 0;
245 }
246 
247 static 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 
288 static 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 
313 static 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 
320 static 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 
330 static void tegra_adma_stop(struct tegra_adma_chan *tdc)
331 {
332 	unsigned int status;
333 
334 	/* Disable ADMA */
335 	tdma_ch_write(tdc, ADMA_CH_CMD, 0);
336 
337 	/* Clear interrupt status */
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 
351 static 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 	/* Start ADMA */
381 	tdma_ch_write(tdc, ADMA_CH_CMD, 1);
382 
383 	tdc->desc = desc;
384 }
385 
386 static 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 	 * Handle wrap around of buffer count register
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 
407 static 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 
427 static 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 
442 static 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 
452 static 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 
474 static 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 
487 static 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 
506 static 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 
540 static 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 
548 static 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 
556 static 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 
607 static 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 
646 static 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 
669 static 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 
683 static 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 
711 static 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 		/* skip if channel is not active */
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 
737 clk_disable:
738 	clk_disable_unprepare(tdma->ahub_clk);
739 
740 	return 0;
741 }
742 
743 static 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 		/* skip if channel was not active earlier */
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 
778 static 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 
793 static 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 
808 static 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 };
813 MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
814 
815 static 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 
919 dma_remove:
920 	dma_async_device_unregister(&tdma->dma_dev);
921 rpm_put:
922 	pm_runtime_put_sync(&pdev->dev);
923 rpm_disable:
924 	pm_runtime_disable(&pdev->dev);
925 irq_dispose:
926 	while (--i >= 0)
927 		irq_dispose_mapping(tdma->channels[i].irq);
928 
929 	return ret;
930 }
931 
932 static 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 
949 static 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 
956 static 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 
966 module_platform_driver(tegra_admac_driver);
967 
968 MODULE_ALIAS("platform:tegra210-adma");
969 MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
970 MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
971 MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
972 MODULE_LICENSE("GPL v2");
973