Loading...
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.h>
12#include <linux/of_dma.h>
13#include <linux/of_irq.h>
14#include <linux/platform_device.h>
15#include <linux/pm_runtime.h>
16#include <linux/slab.h>
17
18#include "virt-dma.h"
19
20#define ADMA_CH_CMD 0x00
21#define ADMA_CH_STATUS 0x0c
22#define ADMA_CH_STATUS_XFER_EN BIT(0)
23#define ADMA_CH_STATUS_XFER_PAUSED BIT(1)
24
25#define ADMA_CH_INT_STATUS 0x10
26#define ADMA_CH_INT_STATUS_XFER_DONE BIT(0)
27
28#define ADMA_CH_INT_CLEAR 0x1c
29#define ADMA_CH_CTRL 0x24
30#define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12)
31#define ADMA_CH_CTRL_DIR_AHUB2MEM 2
32#define ADMA_CH_CTRL_DIR_MEM2AHUB 4
33#define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8)
34#define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1)
35#define ADMA_CH_CTRL_XFER_PAUSE_SHIFT 0
36
37#define ADMA_CH_CONFIG 0x28
38#define ADMA_CH_CONFIG_SRC_BUF(val) (((val) & 0x7) << 28)
39#define ADMA_CH_CONFIG_TRG_BUF(val) (((val) & 0x7) << 24)
40#define ADMA_CH_CONFIG_BURST_SIZE_SHIFT 20
41#define ADMA_CH_CONFIG_MAX_BURST_SIZE 16
42#define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf)
43#define ADMA_CH_CONFIG_MAX_BUFS 8
44#define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) (reqs << 4)
45
46#define ADMA_CH_FIFO_CTRL 0x2c
47#define ADMA_CH_TX_FIFO_SIZE_SHIFT 8
48#define ADMA_CH_RX_FIFO_SIZE_SHIFT 0
49
50#define ADMA_CH_LOWER_SRC_ADDR 0x34
51#define ADMA_CH_LOWER_TRG_ADDR 0x3c
52#define ADMA_CH_TC 0x44
53#define ADMA_CH_TC_COUNT_MASK 0x3ffffffc
54
55#define ADMA_CH_XFER_STATUS 0x54
56#define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff
57
58#define ADMA_GLOBAL_CMD 0x00
59#define ADMA_GLOBAL_SOFT_RESET 0x04
60
61#define TEGRA_ADMA_BURST_COMPLETE_TIME 20
62
63#define ADMA_CH_REG_FIELD_VAL(val, mask, shift) (((val) & mask) << shift)
64
65struct tegra_adma;
66
67/*
68 * struct tegra_adma_chip_data - Tegra chip specific data
69 * @adma_get_burst_config: Function callback used to set DMA burst size.
70 * @global_reg_offset: Register offset of DMA global register.
71 * @global_int_clear: Register offset of DMA global interrupt clear.
72 * @ch_req_tx_shift: Register offset for AHUB transmit channel select.
73 * @ch_req_rx_shift: Register offset for AHUB receive channel select.
74 * @ch_base_offset: Register offset of DMA channel registers.
75 * @ch_fifo_ctrl: Default value for channel FIFO CTRL register.
76 * @ch_req_mask: Mask for Tx or Rx channel select.
77 * @ch_req_max: Maximum number of Tx or Rx channels available.
78 * @ch_reg_size: Size of DMA channel register space.
79 * @nr_channels: Number of DMA channels available.
80 * @ch_fifo_size_mask: Mask for FIFO size field.
81 * @sreq_index_offset: Slave channel index offset.
82 * @has_outstanding_reqs: If DMA channel can have outstanding requests.
83 */
84struct tegra_adma_chip_data {
85 unsigned int (*adma_get_burst_config)(unsigned int burst_size);
86 unsigned int global_reg_offset;
87 unsigned int global_int_clear;
88 unsigned int ch_req_tx_shift;
89 unsigned int ch_req_rx_shift;
90 unsigned int ch_base_offset;
91 unsigned int ch_fifo_ctrl;
92 unsigned int ch_req_mask;
93 unsigned int ch_req_max;
94 unsigned int ch_reg_size;
95 unsigned int nr_channels;
96 unsigned int ch_fifo_size_mask;
97 unsigned int sreq_index_offset;
98 bool has_outstanding_reqs;
99};
100
101/*
102 * struct tegra_adma_chan_regs - Tegra ADMA channel registers
103 */
104struct tegra_adma_chan_regs {
105 unsigned int ctrl;
106 unsigned int config;
107 unsigned int src_addr;
108 unsigned int trg_addr;
109 unsigned int fifo_ctrl;
110 unsigned int cmd;
111 unsigned int tc;
112};
113
114/*
115 * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests.
116 */
117struct tegra_adma_desc {
118 struct virt_dma_desc vd;
119 struct tegra_adma_chan_regs ch_regs;
120 size_t buf_len;
121 size_t period_len;
122 size_t num_periods;
123};
124
125/*
126 * struct tegra_adma_chan - Tegra ADMA channel information
127 */
128struct tegra_adma_chan {
129 struct virt_dma_chan vc;
130 struct tegra_adma_desc *desc;
131 struct tegra_adma *tdma;
132 int irq;
133 void __iomem *chan_addr;
134
135 /* Slave channel configuration info */
136 struct dma_slave_config sconfig;
137 enum dma_transfer_direction sreq_dir;
138 unsigned int sreq_index;
139 bool sreq_reserved;
140 struct tegra_adma_chan_regs ch_regs;
141
142 /* Transfer count and position info */
143 unsigned int tx_buf_count;
144 unsigned int tx_buf_pos;
145};
146
147/*
148 * struct tegra_adma - Tegra ADMA controller information
149 */
150struct tegra_adma {
151 struct dma_device dma_dev;
152 struct device *dev;
153 void __iomem *base_addr;
154 struct clk *ahub_clk;
155 unsigned int nr_channels;
156 unsigned long *dma_chan_mask;
157 unsigned long rx_requests_reserved;
158 unsigned long tx_requests_reserved;
159
160 /* Used to store global command register state when suspending */
161 unsigned int global_cmd;
162
163 const struct tegra_adma_chip_data *cdata;
164
165 /* Last member of the structure */
166 struct tegra_adma_chan channels[] __counted_by(nr_channels);
167};
168
169static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
170{
171 writel(val, tdma->base_addr + tdma->cdata->global_reg_offset + reg);
172}
173
174static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
175{
176 return readl(tdma->base_addr + tdma->cdata->global_reg_offset + reg);
177}
178
179static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
180{
181 writel(val, tdc->chan_addr + reg);
182}
183
184static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
185{
186 return readl(tdc->chan_addr + reg);
187}
188
189static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc)
190{
191 return container_of(dc, struct tegra_adma_chan, vc.chan);
192}
193
194static inline struct tegra_adma_desc *to_tegra_adma_desc(
195 struct dma_async_tx_descriptor *td)
196{
197 return container_of(td, struct tegra_adma_desc, vd.tx);
198}
199
200static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
201{
202 return tdc->tdma->dev;
203}
204
205static void tegra_adma_desc_free(struct virt_dma_desc *vd)
206{
207 kfree(container_of(vd, struct tegra_adma_desc, vd));
208}
209
210static int tegra_adma_slave_config(struct dma_chan *dc,
211 struct dma_slave_config *sconfig)
212{
213 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
214
215 memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig));
216
217 return 0;
218}
219
220static int tegra_adma_init(struct tegra_adma *tdma)
221{
222 u32 status;
223 int ret;
224
225 /* Clear any interrupts */
226 tdma_write(tdma, tdma->cdata->ch_base_offset + tdma->cdata->global_int_clear, 0x1);
227
228 /* Assert soft reset */
229 tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
230
231 /* Wait for reset to clear */
232 ret = readx_poll_timeout(readl,
233 tdma->base_addr +
234 tdma->cdata->global_reg_offset +
235 ADMA_GLOBAL_SOFT_RESET,
236 status, status == 0, 20, 10000);
237 if (ret)
238 return ret;
239
240 /* Enable global ADMA registers */
241 tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
242
243 return 0;
244}
245
246static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
247 enum dma_transfer_direction direction)
248{
249 struct tegra_adma *tdma = tdc->tdma;
250 unsigned int sreq_index = tdc->sreq_index;
251
252 if (tdc->sreq_reserved)
253 return tdc->sreq_dir == direction ? 0 : -EINVAL;
254
255 if (sreq_index > tdma->cdata->ch_req_max) {
256 dev_err(tdma->dev, "invalid DMA request\n");
257 return -EINVAL;
258 }
259
260 switch (direction) {
261 case DMA_MEM_TO_DEV:
262 if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
263 dev_err(tdma->dev, "DMA request reserved\n");
264 return -EINVAL;
265 }
266 break;
267
268 case DMA_DEV_TO_MEM:
269 if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
270 dev_err(tdma->dev, "DMA request reserved\n");
271 return -EINVAL;
272 }
273 break;
274
275 default:
276 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
277 dma_chan_name(&tdc->vc.chan));
278 return -EINVAL;
279 }
280
281 tdc->sreq_dir = direction;
282 tdc->sreq_reserved = true;
283
284 return 0;
285}
286
287static void tegra_adma_request_free(struct tegra_adma_chan *tdc)
288{
289 struct tegra_adma *tdma = tdc->tdma;
290
291 if (!tdc->sreq_reserved)
292 return;
293
294 switch (tdc->sreq_dir) {
295 case DMA_MEM_TO_DEV:
296 clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved);
297 break;
298
299 case DMA_DEV_TO_MEM:
300 clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved);
301 break;
302
303 default:
304 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
305 dma_chan_name(&tdc->vc.chan));
306 return;
307 }
308
309 tdc->sreq_reserved = false;
310}
311
312static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc)
313{
314 u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS);
315
316 return status & ADMA_CH_INT_STATUS_XFER_DONE;
317}
318
319static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc)
320{
321 u32 status = tegra_adma_irq_status(tdc);
322
323 if (status)
324 tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status);
325
326 return status;
327}
328
329static void tegra_adma_stop(struct tegra_adma_chan *tdc)
330{
331 unsigned int status;
332
333 /* Disable ADMA */
334 tdma_ch_write(tdc, ADMA_CH_CMD, 0);
335
336 /* Clear interrupt status */
337 tegra_adma_irq_clear(tdc);
338
339 if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS,
340 status, !(status & ADMA_CH_STATUS_XFER_EN),
341 20, 10000)) {
342 dev_err(tdc2dev(tdc), "unable to stop DMA channel\n");
343 return;
344 }
345
346 kfree(tdc->desc);
347 tdc->desc = NULL;
348}
349
350static void tegra_adma_start(struct tegra_adma_chan *tdc)
351{
352 struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc);
353 struct tegra_adma_chan_regs *ch_regs;
354 struct tegra_adma_desc *desc;
355
356 if (!vd)
357 return;
358
359 list_del(&vd->node);
360
361 desc = to_tegra_adma_desc(&vd->tx);
362
363 if (!desc) {
364 dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n");
365 return;
366 }
367
368 ch_regs = &desc->ch_regs;
369
370 tdc->tx_buf_pos = 0;
371 tdc->tx_buf_count = 0;
372 tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc);
373 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
374 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr);
375 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr);
376 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl);
377 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
378
379 /* Start ADMA */
380 tdma_ch_write(tdc, ADMA_CH_CMD, 1);
381
382 tdc->desc = desc;
383}
384
385static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc)
386{
387 struct tegra_adma_desc *desc = tdc->desc;
388 unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1;
389 unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS);
390 unsigned int periods_remaining;
391
392 /*
393 * Handle wrap around of buffer count register
394 */
395 if (pos < tdc->tx_buf_pos)
396 tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos);
397 else
398 tdc->tx_buf_count += pos - tdc->tx_buf_pos;
399
400 periods_remaining = tdc->tx_buf_count % desc->num_periods;
401 tdc->tx_buf_pos = pos;
402
403 return desc->buf_len - (periods_remaining * desc->period_len);
404}
405
406static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
407{
408 struct tegra_adma_chan *tdc = dev_id;
409 unsigned long status;
410
411 spin_lock(&tdc->vc.lock);
412
413 status = tegra_adma_irq_clear(tdc);
414 if (status == 0 || !tdc->desc) {
415 spin_unlock(&tdc->vc.lock);
416 return IRQ_NONE;
417 }
418
419 vchan_cyclic_callback(&tdc->desc->vd);
420
421 spin_unlock(&tdc->vc.lock);
422
423 return IRQ_HANDLED;
424}
425
426static void tegra_adma_issue_pending(struct dma_chan *dc)
427{
428 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
429 unsigned long flags;
430
431 spin_lock_irqsave(&tdc->vc.lock, flags);
432
433 if (vchan_issue_pending(&tdc->vc)) {
434 if (!tdc->desc)
435 tegra_adma_start(tdc);
436 }
437
438 spin_unlock_irqrestore(&tdc->vc.lock, flags);
439}
440
441static bool tegra_adma_is_paused(struct tegra_adma_chan *tdc)
442{
443 u32 csts;
444
445 csts = tdma_ch_read(tdc, ADMA_CH_STATUS);
446 csts &= ADMA_CH_STATUS_XFER_PAUSED;
447
448 return csts ? true : false;
449}
450
451static int tegra_adma_pause(struct dma_chan *dc)
452{
453 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
454 struct tegra_adma_desc *desc = tdc->desc;
455 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
456 int dcnt = 10;
457
458 ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
459 ch_regs->ctrl |= (1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
460 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
461
462 while (dcnt-- && !tegra_adma_is_paused(tdc))
463 udelay(TEGRA_ADMA_BURST_COMPLETE_TIME);
464
465 if (dcnt < 0) {
466 dev_err(tdc2dev(tdc), "unable to pause DMA channel\n");
467 return -EBUSY;
468 }
469
470 return 0;
471}
472
473static int tegra_adma_resume(struct dma_chan *dc)
474{
475 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
476 struct tegra_adma_desc *desc = tdc->desc;
477 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
478
479 ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
480 ch_regs->ctrl &= ~(1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
481 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
482
483 return 0;
484}
485
486static int tegra_adma_terminate_all(struct dma_chan *dc)
487{
488 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
489 unsigned long flags;
490 LIST_HEAD(head);
491
492 spin_lock_irqsave(&tdc->vc.lock, flags);
493
494 if (tdc->desc)
495 tegra_adma_stop(tdc);
496
497 tegra_adma_request_free(tdc);
498 vchan_get_all_descriptors(&tdc->vc, &head);
499 spin_unlock_irqrestore(&tdc->vc.lock, flags);
500 vchan_dma_desc_free_list(&tdc->vc, &head);
501
502 return 0;
503}
504
505static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
506 dma_cookie_t cookie,
507 struct dma_tx_state *txstate)
508{
509 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
510 struct tegra_adma_desc *desc;
511 struct virt_dma_desc *vd;
512 enum dma_status ret;
513 unsigned long flags;
514 unsigned int residual;
515
516 ret = dma_cookie_status(dc, cookie, txstate);
517 if (ret == DMA_COMPLETE || !txstate)
518 return ret;
519
520 spin_lock_irqsave(&tdc->vc.lock, flags);
521
522 vd = vchan_find_desc(&tdc->vc, cookie);
523 if (vd) {
524 desc = to_tegra_adma_desc(&vd->tx);
525 residual = desc->ch_regs.tc;
526 } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
527 residual = tegra_adma_get_residue(tdc);
528 } else {
529 residual = 0;
530 }
531
532 spin_unlock_irqrestore(&tdc->vc.lock, flags);
533
534 dma_set_residue(txstate, residual);
535
536 return ret;
537}
538
539static unsigned int tegra210_adma_get_burst_config(unsigned int burst_size)
540{
541 if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
542 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
543
544 return fls(burst_size) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
545}
546
547static unsigned int tegra186_adma_get_burst_config(unsigned int burst_size)
548{
549 if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
550 burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
551
552 return (burst_size - 1) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
553}
554
555static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
556 struct tegra_adma_desc *desc,
557 dma_addr_t buf_addr,
558 enum dma_transfer_direction direction)
559{
560 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
561 const struct tegra_adma_chip_data *cdata = tdc->tdma->cdata;
562 unsigned int burst_size, adma_dir, fifo_size_shift;
563
564 if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
565 return -EINVAL;
566
567 switch (direction) {
568 case DMA_MEM_TO_DEV:
569 fifo_size_shift = ADMA_CH_TX_FIFO_SIZE_SHIFT;
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 fifo_size_shift = ADMA_CH_RX_FIFO_SIZE_SHIFT;
581 adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
582 burst_size = tdc->sconfig.src_maxburst;
583 ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
584 ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
585 cdata->ch_req_mask,
586 cdata->ch_req_rx_shift);
587 ch_regs->trg_addr = buf_addr;
588 break;
589
590 default:
591 dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
592 return -EINVAL;
593 }
594
595 ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) |
596 ADMA_CH_CTRL_MODE_CONTINUOUS |
597 ADMA_CH_CTRL_FLOWCTRL_EN;
598 ch_regs->config |= cdata->adma_get_burst_config(burst_size);
599 ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1);
600 if (cdata->has_outstanding_reqs)
601 ch_regs->config |= TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(8);
602
603 /*
604 * 'sreq_index' represents the current ADMAIF channel number and as per
605 * HW recommendation its FIFO size should match with the corresponding
606 * ADMA channel.
607 *
608 * ADMA FIFO size is set as per below (based on default ADMAIF channel
609 * FIFO sizes):
610 * fifo_size = 0x2 (sreq_index > sreq_index_offset)
611 * fifo_size = 0x3 (sreq_index <= sreq_index_offset)
612 *
613 */
614 if (tdc->sreq_index > cdata->sreq_index_offset)
615 ch_regs->fifo_ctrl =
616 ADMA_CH_REG_FIELD_VAL(2, cdata->ch_fifo_size_mask,
617 fifo_size_shift);
618 else
619 ch_regs->fifo_ctrl =
620 ADMA_CH_REG_FIELD_VAL(3, cdata->ch_fifo_size_mask,
621 fifo_size_shift);
622
623 ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
624
625 return tegra_adma_request_alloc(tdc, direction);
626}
627
628static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
629 struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
630 size_t period_len, enum dma_transfer_direction direction,
631 unsigned long flags)
632{
633 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
634 struct tegra_adma_desc *desc = NULL;
635
636 if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
637 dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
638 return NULL;
639 }
640
641 if (buf_len % period_len) {
642 dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
643 return NULL;
644 }
645
646 if (!IS_ALIGNED(buf_addr, 4)) {
647 dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
648 return NULL;
649 }
650
651 desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
652 if (!desc)
653 return NULL;
654
655 desc->buf_len = buf_len;
656 desc->period_len = period_len;
657 desc->num_periods = buf_len / period_len;
658
659 if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
660 kfree(desc);
661 return NULL;
662 }
663
664 return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
665}
666
667static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
668{
669 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
670 int ret;
671
672 ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
673 if (ret) {
674 dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
675 dma_chan_name(dc));
676 return ret;
677 }
678
679 ret = pm_runtime_resume_and_get(tdc2dev(tdc));
680 if (ret < 0) {
681 free_irq(tdc->irq, tdc);
682 return ret;
683 }
684
685 dma_cookie_init(&tdc->vc.chan);
686
687 return 0;
688}
689
690static void tegra_adma_free_chan_resources(struct dma_chan *dc)
691{
692 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
693
694 tegra_adma_terminate_all(dc);
695 vchan_free_chan_resources(&tdc->vc);
696 tasklet_kill(&tdc->vc.task);
697 free_irq(tdc->irq, tdc);
698 pm_runtime_put(tdc2dev(tdc));
699
700 tdc->sreq_index = 0;
701 tdc->sreq_dir = DMA_TRANS_NONE;
702}
703
704static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
705 struct of_dma *ofdma)
706{
707 struct tegra_adma *tdma = ofdma->of_dma_data;
708 struct tegra_adma_chan *tdc;
709 struct dma_chan *chan;
710 unsigned int sreq_index;
711
712 if (dma_spec->args_count != 1)
713 return NULL;
714
715 sreq_index = dma_spec->args[0];
716
717 if (sreq_index == 0) {
718 dev_err(tdma->dev, "DMA request must not be 0\n");
719 return NULL;
720 }
721
722 chan = dma_get_any_slave_channel(&tdma->dma_dev);
723 if (!chan)
724 return NULL;
725
726 tdc = to_tegra_adma_chan(chan);
727 tdc->sreq_index = sreq_index;
728
729 return chan;
730}
731
732static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev)
733{
734 struct tegra_adma *tdma = dev_get_drvdata(dev);
735 struct tegra_adma_chan_regs *ch_reg;
736 struct tegra_adma_chan *tdc;
737 int i;
738
739 tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
740 if (!tdma->global_cmd)
741 goto clk_disable;
742
743 for (i = 0; i < tdma->nr_channels; i++) {
744 tdc = &tdma->channels[i];
745 /* skip for reserved channels */
746 if (!tdc->tdma)
747 continue;
748
749 ch_reg = &tdc->ch_regs;
750 ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD);
751 /* skip if channel is not active */
752 if (!ch_reg->cmd)
753 continue;
754 ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC);
755 ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR);
756 ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR);
757 ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
758 ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL);
759 ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG);
760 }
761
762clk_disable:
763 clk_disable_unprepare(tdma->ahub_clk);
764
765 return 0;
766}
767
768static int __maybe_unused tegra_adma_runtime_resume(struct device *dev)
769{
770 struct tegra_adma *tdma = dev_get_drvdata(dev);
771 struct tegra_adma_chan_regs *ch_reg;
772 struct tegra_adma_chan *tdc;
773 int ret, i;
774
775 ret = clk_prepare_enable(tdma->ahub_clk);
776 if (ret) {
777 dev_err(dev, "ahub clk_enable failed: %d\n", ret);
778 return ret;
779 }
780 tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
781
782 if (!tdma->global_cmd)
783 return 0;
784
785 for (i = 0; i < tdma->nr_channels; i++) {
786 tdc = &tdma->channels[i];
787 /* skip for reserved channels */
788 if (!tdc->tdma)
789 continue;
790 ch_reg = &tdc->ch_regs;
791 /* skip if channel was not active earlier */
792 if (!ch_reg->cmd)
793 continue;
794 tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc);
795 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr);
796 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr);
797 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl);
798 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl);
799 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config);
800 tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd);
801 }
802
803 return 0;
804}
805
806static const struct tegra_adma_chip_data tegra210_chip_data = {
807 .adma_get_burst_config = tegra210_adma_get_burst_config,
808 .global_reg_offset = 0xc00,
809 .global_int_clear = 0x20,
810 .ch_req_tx_shift = 28,
811 .ch_req_rx_shift = 24,
812 .ch_base_offset = 0,
813 .ch_req_mask = 0xf,
814 .ch_req_max = 10,
815 .ch_reg_size = 0x80,
816 .nr_channels = 22,
817 .ch_fifo_size_mask = 0xf,
818 .sreq_index_offset = 2,
819 .has_outstanding_reqs = false,
820};
821
822static const struct tegra_adma_chip_data tegra186_chip_data = {
823 .adma_get_burst_config = tegra186_adma_get_burst_config,
824 .global_reg_offset = 0,
825 .global_int_clear = 0x402c,
826 .ch_req_tx_shift = 27,
827 .ch_req_rx_shift = 22,
828 .ch_base_offset = 0x10000,
829 .ch_req_mask = 0x1f,
830 .ch_req_max = 20,
831 .ch_reg_size = 0x100,
832 .nr_channels = 32,
833 .ch_fifo_size_mask = 0x1f,
834 .sreq_index_offset = 4,
835 .has_outstanding_reqs = true,
836};
837
838static const struct of_device_id tegra_adma_of_match[] = {
839 { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
840 { .compatible = "nvidia,tegra186-adma", .data = &tegra186_chip_data },
841 { },
842};
843MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
844
845static int tegra_adma_probe(struct platform_device *pdev)
846{
847 const struct tegra_adma_chip_data *cdata;
848 struct tegra_adma *tdma;
849 int ret, i;
850
851 cdata = of_device_get_match_data(&pdev->dev);
852 if (!cdata) {
853 dev_err(&pdev->dev, "device match data not found\n");
854 return -ENODEV;
855 }
856
857 tdma = devm_kzalloc(&pdev->dev,
858 struct_size(tdma, channels, cdata->nr_channels),
859 GFP_KERNEL);
860 if (!tdma)
861 return -ENOMEM;
862
863 tdma->dev = &pdev->dev;
864 tdma->cdata = cdata;
865 tdma->nr_channels = cdata->nr_channels;
866 platform_set_drvdata(pdev, tdma);
867
868 tdma->base_addr = devm_platform_ioremap_resource(pdev, 0);
869 if (IS_ERR(tdma->base_addr))
870 return PTR_ERR(tdma->base_addr);
871
872 tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio");
873 if (IS_ERR(tdma->ahub_clk)) {
874 dev_err(&pdev->dev, "Error: Missing ahub controller clock\n");
875 return PTR_ERR(tdma->ahub_clk);
876 }
877
878 tdma->dma_chan_mask = devm_kzalloc(&pdev->dev,
879 BITS_TO_LONGS(tdma->nr_channels) * sizeof(unsigned long),
880 GFP_KERNEL);
881 if (!tdma->dma_chan_mask)
882 return -ENOMEM;
883
884 /* Enable all channels by default */
885 bitmap_fill(tdma->dma_chan_mask, tdma->nr_channels);
886
887 ret = of_property_read_u32_array(pdev->dev.of_node, "dma-channel-mask",
888 (u32 *)tdma->dma_chan_mask,
889 BITS_TO_U32(tdma->nr_channels));
890 if (ret < 0 && (ret != -EINVAL)) {
891 dev_err(&pdev->dev, "dma-channel-mask is not complete.\n");
892 return ret;
893 }
894
895 INIT_LIST_HEAD(&tdma->dma_dev.channels);
896 for (i = 0; i < tdma->nr_channels; i++) {
897 struct tegra_adma_chan *tdc = &tdma->channels[i];
898
899 /* skip for reserved channels */
900 if (!test_bit(i, tdma->dma_chan_mask))
901 continue;
902
903 tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
904 + (cdata->ch_reg_size * i);
905
906 tdc->irq = of_irq_get(pdev->dev.of_node, i);
907 if (tdc->irq <= 0) {
908 ret = tdc->irq ?: -ENXIO;
909 goto irq_dispose;
910 }
911
912 vchan_init(&tdc->vc, &tdma->dma_dev);
913 tdc->vc.desc_free = tegra_adma_desc_free;
914 tdc->tdma = tdma;
915 }
916
917 pm_runtime_enable(&pdev->dev);
918
919 ret = pm_runtime_resume_and_get(&pdev->dev);
920 if (ret < 0)
921 goto rpm_disable;
922
923 ret = tegra_adma_init(tdma);
924 if (ret)
925 goto rpm_put;
926
927 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
928 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
929 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
930
931 tdma->dma_dev.dev = &pdev->dev;
932 tdma->dma_dev.device_alloc_chan_resources =
933 tegra_adma_alloc_chan_resources;
934 tdma->dma_dev.device_free_chan_resources =
935 tegra_adma_free_chan_resources;
936 tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
937 tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
938 tdma->dma_dev.device_config = tegra_adma_slave_config;
939 tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
940 tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
941 tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
942 tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
943 tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
944 tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
945 tdma->dma_dev.device_pause = tegra_adma_pause;
946 tdma->dma_dev.device_resume = tegra_adma_resume;
947
948 ret = dma_async_device_register(&tdma->dma_dev);
949 if (ret < 0) {
950 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
951 goto rpm_put;
952 }
953
954 ret = of_dma_controller_register(pdev->dev.of_node,
955 tegra_dma_of_xlate, tdma);
956 if (ret < 0) {
957 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
958 goto dma_remove;
959 }
960
961 pm_runtime_put(&pdev->dev);
962
963 dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
964 tdma->nr_channels);
965
966 return 0;
967
968dma_remove:
969 dma_async_device_unregister(&tdma->dma_dev);
970rpm_put:
971 pm_runtime_put_sync(&pdev->dev);
972rpm_disable:
973 pm_runtime_disable(&pdev->dev);
974irq_dispose:
975 while (--i >= 0)
976 irq_dispose_mapping(tdma->channels[i].irq);
977
978 return ret;
979}
980
981static void tegra_adma_remove(struct platform_device *pdev)
982{
983 struct tegra_adma *tdma = platform_get_drvdata(pdev);
984 int i;
985
986 of_dma_controller_free(pdev->dev.of_node);
987 dma_async_device_unregister(&tdma->dma_dev);
988
989 for (i = 0; i < tdma->nr_channels; ++i) {
990 if (tdma->channels[i].irq)
991 irq_dispose_mapping(tdma->channels[i].irq);
992 }
993
994 pm_runtime_disable(&pdev->dev);
995}
996
997static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
998 SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
999 tegra_adma_runtime_resume, NULL)
1000 SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1001 pm_runtime_force_resume)
1002};
1003
1004static struct platform_driver tegra_admac_driver = {
1005 .driver = {
1006 .name = "tegra-adma",
1007 .pm = &tegra_adma_dev_pm_ops,
1008 .of_match_table = tegra_adma_of_match,
1009 },
1010 .probe = tegra_adma_probe,
1011 .remove_new = tegra_adma_remove,
1012};
1013
1014module_platform_driver(tegra_admac_driver);
1015
1016MODULE_ALIAS("platform:tegra210-adma");
1017MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
1018MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
1019MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
1020MODULE_LICENSE("GPL v2");
1/*
2 * ADMA driver for Nvidia's Tegra210 ADMA controller.
3 *
4 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#include <linux/clk.h>
20#include <linux/iopoll.h>
21#include <linux/module.h>
22#include <linux/of_device.h>
23#include <linux/of_dma.h>
24#include <linux/of_irq.h>
25#include <linux/pm_clock.h>
26#include <linux/pm_runtime.h>
27#include <linux/slab.h>
28
29#include "virt-dma.h"
30
31#define ADMA_CH_CMD 0x00
32#define ADMA_CH_STATUS 0x0c
33#define ADMA_CH_STATUS_XFER_EN BIT(0)
34
35#define ADMA_CH_INT_STATUS 0x10
36#define ADMA_CH_INT_STATUS_XFER_DONE BIT(0)
37
38#define ADMA_CH_INT_CLEAR 0x1c
39#define ADMA_CH_CTRL 0x24
40#define ADMA_CH_CTRL_TX_REQ(val) (((val) & 0xf) << 28)
41#define ADMA_CH_CTRL_TX_REQ_MAX 10
42#define ADMA_CH_CTRL_RX_REQ(val) (((val) & 0xf) << 24)
43#define ADMA_CH_CTRL_RX_REQ_MAX 10
44#define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12)
45#define ADMA_CH_CTRL_DIR_AHUB2MEM 2
46#define ADMA_CH_CTRL_DIR_MEM2AHUB 4
47#define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8)
48#define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1)
49
50#define ADMA_CH_CONFIG 0x28
51#define ADMA_CH_CONFIG_SRC_BUF(val) (((val) & 0x7) << 28)
52#define ADMA_CH_CONFIG_TRG_BUF(val) (((val) & 0x7) << 24)
53#define ADMA_CH_CONFIG_BURST_SIZE(val) (((val) & 0x7) << 20)
54#define ADMA_CH_CONFIG_BURST_16 5
55#define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf)
56#define ADMA_CH_CONFIG_MAX_BUFS 8
57
58#define ADMA_CH_FIFO_CTRL 0x2c
59#define ADMA_CH_FIFO_CTRL_OVRFW_THRES(val) (((val) & 0xf) << 24)
60#define ADMA_CH_FIFO_CTRL_STARV_THRES(val) (((val) & 0xf) << 16)
61#define ADMA_CH_FIFO_CTRL_TX_SIZE(val) (((val) & 0xf) << 8)
62#define ADMA_CH_FIFO_CTRL_RX_SIZE(val) ((val) & 0xf)
63
64#define ADMA_CH_LOWER_SRC_ADDR 0x34
65#define ADMA_CH_LOWER_TRG_ADDR 0x3c
66#define ADMA_CH_TC 0x44
67#define ADMA_CH_TC_COUNT_MASK 0x3ffffffc
68
69#define ADMA_CH_XFER_STATUS 0x54
70#define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff
71
72#define ADMA_GLOBAL_CMD 0xc00
73#define ADMA_GLOBAL_SOFT_RESET 0xc04
74#define ADMA_GLOBAL_INT_CLEAR 0xc20
75#define ADMA_GLOBAL_CTRL 0xc24
76
77#define ADMA_CH_REG_OFFSET(a) (a * 0x80)
78
79#define ADMA_CH_FIFO_CTRL_DEFAULT (ADMA_CH_FIFO_CTRL_OVRFW_THRES(1) | \
80 ADMA_CH_FIFO_CTRL_STARV_THRES(1) | \
81 ADMA_CH_FIFO_CTRL_TX_SIZE(3) | \
82 ADMA_CH_FIFO_CTRL_RX_SIZE(3))
83struct tegra_adma;
84
85/*
86 * struct tegra_adma_chip_data - Tegra chip specific data
87 * @nr_channels: Number of DMA channels available.
88 */
89struct tegra_adma_chip_data {
90 int nr_channels;
91};
92
93/*
94 * struct tegra_adma_chan_regs - Tegra ADMA channel registers
95 */
96struct tegra_adma_chan_regs {
97 unsigned int ctrl;
98 unsigned int config;
99 unsigned int src_addr;
100 unsigned int trg_addr;
101 unsigned int fifo_ctrl;
102 unsigned int tc;
103};
104
105/*
106 * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests.
107 */
108struct tegra_adma_desc {
109 struct virt_dma_desc vd;
110 struct tegra_adma_chan_regs ch_regs;
111 size_t buf_len;
112 size_t period_len;
113 size_t num_periods;
114};
115
116/*
117 * struct tegra_adma_chan - Tegra ADMA channel information
118 */
119struct tegra_adma_chan {
120 struct virt_dma_chan vc;
121 struct tegra_adma_desc *desc;
122 struct tegra_adma *tdma;
123 int irq;
124 void __iomem *chan_addr;
125
126 /* Slave channel configuration info */
127 struct dma_slave_config sconfig;
128 enum dma_transfer_direction sreq_dir;
129 unsigned int sreq_index;
130 bool sreq_reserved;
131
132 /* Transfer count and position info */
133 unsigned int tx_buf_count;
134 unsigned int tx_buf_pos;
135};
136
137/*
138 * struct tegra_adma - Tegra ADMA controller information
139 */
140struct tegra_adma {
141 struct dma_device dma_dev;
142 struct device *dev;
143 void __iomem *base_addr;
144 unsigned int nr_channels;
145 unsigned long rx_requests_reserved;
146 unsigned long tx_requests_reserved;
147
148 /* Used to store global command register state when suspending */
149 unsigned int global_cmd;
150
151 /* Last member of the structure */
152 struct tegra_adma_chan channels[0];
153};
154
155static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
156{
157 writel(val, tdma->base_addr + reg);
158}
159
160static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
161{
162 return readl(tdma->base_addr + reg);
163}
164
165static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
166{
167 writel(val, tdc->chan_addr + reg);
168}
169
170static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
171{
172 return readl(tdc->chan_addr + reg);
173}
174
175static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc)
176{
177 return container_of(dc, struct tegra_adma_chan, vc.chan);
178}
179
180static inline struct tegra_adma_desc *to_tegra_adma_desc(
181 struct dma_async_tx_descriptor *td)
182{
183 return container_of(td, struct tegra_adma_desc, vd.tx);
184}
185
186static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
187{
188 return tdc->tdma->dev;
189}
190
191static void tegra_adma_desc_free(struct virt_dma_desc *vd)
192{
193 kfree(container_of(vd, struct tegra_adma_desc, vd));
194}
195
196static int tegra_adma_slave_config(struct dma_chan *dc,
197 struct dma_slave_config *sconfig)
198{
199 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
200
201 memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig));
202
203 return 0;
204}
205
206static int tegra_adma_init(struct tegra_adma *tdma)
207{
208 u32 status;
209 int ret;
210
211 /* Clear any interrupts */
212 tdma_write(tdma, ADMA_GLOBAL_INT_CLEAR, 0x1);
213
214 /* Assert soft reset */
215 tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
216
217 /* Wait for reset to clear */
218 ret = readx_poll_timeout(readl,
219 tdma->base_addr + ADMA_GLOBAL_SOFT_RESET,
220 status, status == 0, 20, 10000);
221 if (ret)
222 return ret;
223
224 /* Enable global ADMA registers */
225 tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
226
227 return 0;
228}
229
230static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
231 enum dma_transfer_direction direction)
232{
233 struct tegra_adma *tdma = tdc->tdma;
234 unsigned int sreq_index = tdc->sreq_index;
235
236 if (tdc->sreq_reserved)
237 return tdc->sreq_dir == direction ? 0 : -EINVAL;
238
239 switch (direction) {
240 case DMA_MEM_TO_DEV:
241 if (sreq_index > ADMA_CH_CTRL_TX_REQ_MAX) {
242 dev_err(tdma->dev, "invalid DMA request\n");
243 return -EINVAL;
244 }
245
246 if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
247 dev_err(tdma->dev, "DMA request reserved\n");
248 return -EINVAL;
249 }
250 break;
251
252 case DMA_DEV_TO_MEM:
253 if (sreq_index > ADMA_CH_CTRL_RX_REQ_MAX) {
254 dev_err(tdma->dev, "invalid DMA request\n");
255 return -EINVAL;
256 }
257
258 if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
259 dev_err(tdma->dev, "DMA request reserved\n");
260 return -EINVAL;
261 }
262 break;
263
264 default:
265 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
266 dma_chan_name(&tdc->vc.chan));
267 return -EINVAL;
268 }
269
270 tdc->sreq_dir = direction;
271 tdc->sreq_reserved = true;
272
273 return 0;
274}
275
276static void tegra_adma_request_free(struct tegra_adma_chan *tdc)
277{
278 struct tegra_adma *tdma = tdc->tdma;
279
280 if (!tdc->sreq_reserved)
281 return;
282
283 switch (tdc->sreq_dir) {
284 case DMA_MEM_TO_DEV:
285 clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved);
286 break;
287
288 case DMA_DEV_TO_MEM:
289 clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved);
290 break;
291
292 default:
293 dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
294 dma_chan_name(&tdc->vc.chan));
295 return;
296 }
297
298 tdc->sreq_reserved = false;
299}
300
301static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc)
302{
303 u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS);
304
305 return status & ADMA_CH_INT_STATUS_XFER_DONE;
306}
307
308static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc)
309{
310 u32 status = tegra_adma_irq_status(tdc);
311
312 if (status)
313 tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status);
314
315 return status;
316}
317
318static void tegra_adma_stop(struct tegra_adma_chan *tdc)
319{
320 unsigned int status;
321
322 /* Disable ADMA */
323 tdma_ch_write(tdc, ADMA_CH_CMD, 0);
324
325 /* Clear interrupt status */
326 tegra_adma_irq_clear(tdc);
327
328 if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS,
329 status, !(status & ADMA_CH_STATUS_XFER_EN),
330 20, 10000)) {
331 dev_err(tdc2dev(tdc), "unable to stop DMA channel\n");
332 return;
333 }
334
335 kfree(tdc->desc);
336 tdc->desc = NULL;
337}
338
339static void tegra_adma_start(struct tegra_adma_chan *tdc)
340{
341 struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc);
342 struct tegra_adma_chan_regs *ch_regs;
343 struct tegra_adma_desc *desc;
344
345 if (!vd)
346 return;
347
348 list_del(&vd->node);
349
350 desc = to_tegra_adma_desc(&vd->tx);
351
352 if (!desc) {
353 dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n");
354 return;
355 }
356
357 ch_regs = &desc->ch_regs;
358
359 tdc->tx_buf_pos = 0;
360 tdc->tx_buf_count = 0;
361 tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc);
362 tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
363 tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr);
364 tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr);
365 tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl);
366 tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
367
368 /* Start ADMA */
369 tdma_ch_write(tdc, ADMA_CH_CMD, 1);
370
371 tdc->desc = desc;
372}
373
374static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc)
375{
376 struct tegra_adma_desc *desc = tdc->desc;
377 unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1;
378 unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS);
379 unsigned int periods_remaining;
380
381 /*
382 * Handle wrap around of buffer count register
383 */
384 if (pos < tdc->tx_buf_pos)
385 tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos);
386 else
387 tdc->tx_buf_count += pos - tdc->tx_buf_pos;
388
389 periods_remaining = tdc->tx_buf_count % desc->num_periods;
390 tdc->tx_buf_pos = pos;
391
392 return desc->buf_len - (periods_remaining * desc->period_len);
393}
394
395static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
396{
397 struct tegra_adma_chan *tdc = dev_id;
398 unsigned long status;
399 unsigned long flags;
400
401 spin_lock_irqsave(&tdc->vc.lock, flags);
402
403 status = tegra_adma_irq_clear(tdc);
404 if (status == 0 || !tdc->desc) {
405 spin_unlock_irqrestore(&tdc->vc.lock, flags);
406 return IRQ_NONE;
407 }
408
409 vchan_cyclic_callback(&tdc->desc->vd);
410
411 spin_unlock_irqrestore(&tdc->vc.lock, flags);
412
413 return IRQ_HANDLED;
414}
415
416static void tegra_adma_issue_pending(struct dma_chan *dc)
417{
418 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
419 unsigned long flags;
420
421 spin_lock_irqsave(&tdc->vc.lock, flags);
422
423 if (vchan_issue_pending(&tdc->vc)) {
424 if (!tdc->desc)
425 tegra_adma_start(tdc);
426 }
427
428 spin_unlock_irqrestore(&tdc->vc.lock, flags);
429}
430
431static int tegra_adma_terminate_all(struct dma_chan *dc)
432{
433 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
434 unsigned long flags;
435 LIST_HEAD(head);
436
437 spin_lock_irqsave(&tdc->vc.lock, flags);
438
439 if (tdc->desc)
440 tegra_adma_stop(tdc);
441
442 tegra_adma_request_free(tdc);
443 vchan_get_all_descriptors(&tdc->vc, &head);
444 spin_unlock_irqrestore(&tdc->vc.lock, flags);
445 vchan_dma_desc_free_list(&tdc->vc, &head);
446
447 return 0;
448}
449
450static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
451 dma_cookie_t cookie,
452 struct dma_tx_state *txstate)
453{
454 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
455 struct tegra_adma_desc *desc;
456 struct virt_dma_desc *vd;
457 enum dma_status ret;
458 unsigned long flags;
459 unsigned int residual;
460
461 ret = dma_cookie_status(dc, cookie, txstate);
462 if (ret == DMA_COMPLETE || !txstate)
463 return ret;
464
465 spin_lock_irqsave(&tdc->vc.lock, flags);
466
467 vd = vchan_find_desc(&tdc->vc, cookie);
468 if (vd) {
469 desc = to_tegra_adma_desc(&vd->tx);
470 residual = desc->ch_regs.tc;
471 } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
472 residual = tegra_adma_get_residue(tdc);
473 } else {
474 residual = 0;
475 }
476
477 spin_unlock_irqrestore(&tdc->vc.lock, flags);
478
479 dma_set_residue(txstate, residual);
480
481 return ret;
482}
483
484static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
485 struct tegra_adma_desc *desc,
486 dma_addr_t buf_addr,
487 enum dma_transfer_direction direction)
488{
489 struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
490 unsigned int burst_size, adma_dir;
491
492 if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
493 return -EINVAL;
494
495 switch (direction) {
496 case DMA_MEM_TO_DEV:
497 adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
498 burst_size = fls(tdc->sconfig.dst_maxburst);
499 ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
500 ch_regs->ctrl = ADMA_CH_CTRL_TX_REQ(tdc->sreq_index);
501 ch_regs->src_addr = buf_addr;
502 break;
503
504 case DMA_DEV_TO_MEM:
505 adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
506 burst_size = fls(tdc->sconfig.src_maxburst);
507 ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
508 ch_regs->ctrl = ADMA_CH_CTRL_RX_REQ(tdc->sreq_index);
509 ch_regs->trg_addr = buf_addr;
510 break;
511
512 default:
513 dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
514 return -EINVAL;
515 }
516
517 if (!burst_size || burst_size > ADMA_CH_CONFIG_BURST_16)
518 burst_size = ADMA_CH_CONFIG_BURST_16;
519
520 ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) |
521 ADMA_CH_CTRL_MODE_CONTINUOUS |
522 ADMA_CH_CTRL_FLOWCTRL_EN;
523 ch_regs->config |= ADMA_CH_CONFIG_BURST_SIZE(burst_size);
524 ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1);
525 ch_regs->fifo_ctrl = ADMA_CH_FIFO_CTRL_DEFAULT;
526 ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
527
528 return tegra_adma_request_alloc(tdc, direction);
529}
530
531static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
532 struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
533 size_t period_len, enum dma_transfer_direction direction,
534 unsigned long flags)
535{
536 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
537 struct tegra_adma_desc *desc = NULL;
538
539 if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
540 dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
541 return NULL;
542 }
543
544 if (buf_len % period_len) {
545 dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
546 return NULL;
547 }
548
549 if (!IS_ALIGNED(buf_addr, 4)) {
550 dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
551 return NULL;
552 }
553
554 desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
555 if (!desc)
556 return NULL;
557
558 desc->buf_len = buf_len;
559 desc->period_len = period_len;
560 desc->num_periods = buf_len / period_len;
561
562 if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
563 kfree(desc);
564 return NULL;
565 }
566
567 return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
568}
569
570static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
571{
572 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
573 int ret;
574
575 ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
576 if (ret) {
577 dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
578 dma_chan_name(dc));
579 return ret;
580 }
581
582 ret = pm_runtime_get_sync(tdc2dev(tdc));
583 if (ret < 0) {
584 free_irq(tdc->irq, tdc);
585 return ret;
586 }
587
588 dma_cookie_init(&tdc->vc.chan);
589
590 return 0;
591}
592
593static void tegra_adma_free_chan_resources(struct dma_chan *dc)
594{
595 struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
596
597 tegra_adma_terminate_all(dc);
598 vchan_free_chan_resources(&tdc->vc);
599 tasklet_kill(&tdc->vc.task);
600 free_irq(tdc->irq, tdc);
601 pm_runtime_put(tdc2dev(tdc));
602
603 tdc->sreq_index = 0;
604 tdc->sreq_dir = DMA_TRANS_NONE;
605}
606
607static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
608 struct of_dma *ofdma)
609{
610 struct tegra_adma *tdma = ofdma->of_dma_data;
611 struct tegra_adma_chan *tdc;
612 struct dma_chan *chan;
613 unsigned int sreq_index;
614
615 if (dma_spec->args_count != 1)
616 return NULL;
617
618 sreq_index = dma_spec->args[0];
619
620 if (sreq_index == 0) {
621 dev_err(tdma->dev, "DMA request must not be 0\n");
622 return NULL;
623 }
624
625 chan = dma_get_any_slave_channel(&tdma->dma_dev);
626 if (!chan)
627 return NULL;
628
629 tdc = to_tegra_adma_chan(chan);
630 tdc->sreq_index = sreq_index;
631
632 return chan;
633}
634
635static int tegra_adma_runtime_suspend(struct device *dev)
636{
637 struct tegra_adma *tdma = dev_get_drvdata(dev);
638
639 tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
640
641 return pm_clk_suspend(dev);
642}
643
644static int tegra_adma_runtime_resume(struct device *dev)
645{
646 struct tegra_adma *tdma = dev_get_drvdata(dev);
647 int ret;
648
649 ret = pm_clk_resume(dev);
650 if (ret)
651 return ret;
652
653 tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
654
655 return 0;
656}
657
658static const struct tegra_adma_chip_data tegra210_chip_data = {
659 .nr_channels = 22,
660};
661
662static const struct of_device_id tegra_adma_of_match[] = {
663 { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
664 { },
665};
666MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
667
668static int tegra_adma_probe(struct platform_device *pdev)
669{
670 const struct tegra_adma_chip_data *cdata;
671 struct tegra_adma *tdma;
672 struct resource *res;
673 int ret, i;
674
675 cdata = of_device_get_match_data(&pdev->dev);
676 if (!cdata) {
677 dev_err(&pdev->dev, "device match data not found\n");
678 return -ENODEV;
679 }
680
681 tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
682 sizeof(struct tegra_adma_chan), GFP_KERNEL);
683 if (!tdma)
684 return -ENOMEM;
685
686 tdma->dev = &pdev->dev;
687 tdma->nr_channels = cdata->nr_channels;
688 platform_set_drvdata(pdev, tdma);
689
690 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
691 tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
692 if (IS_ERR(tdma->base_addr))
693 return PTR_ERR(tdma->base_addr);
694
695 ret = pm_clk_create(&pdev->dev);
696 if (ret)
697 return ret;
698
699 ret = of_pm_clk_add_clk(&pdev->dev, "d_audio");
700 if (ret)
701 goto clk_destroy;
702
703 pm_runtime_enable(&pdev->dev);
704
705 ret = pm_runtime_get_sync(&pdev->dev);
706 if (ret < 0)
707 goto rpm_disable;
708
709 ret = tegra_adma_init(tdma);
710 if (ret)
711 goto rpm_put;
712
713 INIT_LIST_HEAD(&tdma->dma_dev.channels);
714 for (i = 0; i < tdma->nr_channels; i++) {
715 struct tegra_adma_chan *tdc = &tdma->channels[i];
716
717 tdc->chan_addr = tdma->base_addr + ADMA_CH_REG_OFFSET(i);
718
719 tdc->irq = of_irq_get(pdev->dev.of_node, i);
720 if (tdc->irq <= 0) {
721 ret = tdc->irq ?: -ENXIO;
722 goto irq_dispose;
723 }
724
725 vchan_init(&tdc->vc, &tdma->dma_dev);
726 tdc->vc.desc_free = tegra_adma_desc_free;
727 tdc->tdma = tdma;
728 }
729
730 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
731 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
732 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
733
734 tdma->dma_dev.dev = &pdev->dev;
735 tdma->dma_dev.device_alloc_chan_resources =
736 tegra_adma_alloc_chan_resources;
737 tdma->dma_dev.device_free_chan_resources =
738 tegra_adma_free_chan_resources;
739 tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
740 tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
741 tdma->dma_dev.device_config = tegra_adma_slave_config;
742 tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
743 tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
744 tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
745 tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
746 tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
747 tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
748
749 ret = dma_async_device_register(&tdma->dma_dev);
750 if (ret < 0) {
751 dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
752 goto irq_dispose;
753 }
754
755 ret = of_dma_controller_register(pdev->dev.of_node,
756 tegra_dma_of_xlate, tdma);
757 if (ret < 0) {
758 dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
759 goto dma_remove;
760 }
761
762 pm_runtime_put(&pdev->dev);
763
764 dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
765 tdma->nr_channels);
766
767 return 0;
768
769dma_remove:
770 dma_async_device_unregister(&tdma->dma_dev);
771irq_dispose:
772 while (--i >= 0)
773 irq_dispose_mapping(tdma->channels[i].irq);
774rpm_put:
775 pm_runtime_put_sync(&pdev->dev);
776rpm_disable:
777 pm_runtime_disable(&pdev->dev);
778clk_destroy:
779 pm_clk_destroy(&pdev->dev);
780
781 return ret;
782}
783
784static int tegra_adma_remove(struct platform_device *pdev)
785{
786 struct tegra_adma *tdma = platform_get_drvdata(pdev);
787 int i;
788
789 dma_async_device_unregister(&tdma->dma_dev);
790
791 for (i = 0; i < tdma->nr_channels; ++i)
792 irq_dispose_mapping(tdma->channels[i].irq);
793
794 pm_runtime_put_sync(&pdev->dev);
795 pm_runtime_disable(&pdev->dev);
796 pm_clk_destroy(&pdev->dev);
797
798 return 0;
799}
800
801#ifdef CONFIG_PM_SLEEP
802static int tegra_adma_pm_suspend(struct device *dev)
803{
804 return pm_runtime_suspended(dev) == false;
805}
806#endif
807
808static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
809 SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
810 tegra_adma_runtime_resume, NULL)
811 SET_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, NULL)
812};
813
814static struct platform_driver tegra_admac_driver = {
815 .driver = {
816 .name = "tegra-adma",
817 .pm = &tegra_adma_dev_pm_ops,
818 .of_match_table = tegra_adma_of_match,
819 },
820 .probe = tegra_adma_probe,
821 .remove = tegra_adma_remove,
822};
823
824module_platform_driver(tegra_admac_driver);
825
826MODULE_ALIAS("platform:tegra210-adma");
827MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
828MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
829MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
830MODULE_LICENSE("GPL v2");