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dmaengine: at_xdmac: fix debug string
[deliverable/linux.git] / drivers / dma / tegra20-apb-dma.c
CommitLineData
ec8a1586
LD		 1/*
2 * DMA driver for Nvidia's Tegra20 APB DMA controller.
3 *
996556c9 4 * Copyright (c) 2012-2013, NVIDIA CORPORATION. All rights reserved.
ec8a1586
LD		 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/bitops.h>
20#include <linux/clk.h>
21#include <linux/delay.h>
22#include <linux/dmaengine.h>
23#include <linux/dma-mapping.h>
7331205a 24#include <linux/err.h>
ec8a1586
LD		 25#include <linux/init.h>
26#include <linux/interrupt.h>
27#include <linux/io.h>
28#include <linux/mm.h>
29#include <linux/module.h>
30#include <linux/of.h>
31#include <linux/of_device.h>
996556c9 32#include <linux/of_dma.h>
ec8a1586 33#include <linux/platform_device.h>
3065c194 34#include <linux/pm.h>
ec8a1586 35#include <linux/pm_runtime.h>
9aa433d2 36#include <linux/reset.h>
ec8a1586
LD		 37#include <linux/slab.h>
38
ec8a1586
LD		 39#include "dmaengine.h"
40
41#define TEGRA_APBDMA_GENERAL 0x0
42#define TEGRA_APBDMA_GENERAL_ENABLE BIT(31)
43
44#define TEGRA_APBDMA_CONTROL 0x010
45#define TEGRA_APBDMA_IRQ_MASK 0x01c
46#define TEGRA_APBDMA_IRQ_MASK_SET 0x020
47
48/* CSR register */
49#define TEGRA_APBDMA_CHAN_CSR 0x00
50#define TEGRA_APBDMA_CSR_ENB BIT(31)
51#define TEGRA_APBDMA_CSR_IE_EOC BIT(30)
52#define TEGRA_APBDMA_CSR_HOLD BIT(29)
53#define TEGRA_APBDMA_CSR_DIR BIT(28)
54#define TEGRA_APBDMA_CSR_ONCE BIT(27)
55#define TEGRA_APBDMA_CSR_FLOW BIT(21)
56#define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16
00ef4490 57#define TEGRA_APBDMA_CSR_REQ_SEL_MASK 0x1F
ec8a1586
LD		 58#define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC
59
60/* STATUS register */
61#define TEGRA_APBDMA_CHAN_STATUS 0x004
62#define TEGRA_APBDMA_STATUS_BUSY BIT(31)
63#define TEGRA_APBDMA_STATUS_ISE_EOC BIT(30)
64#define TEGRA_APBDMA_STATUS_HALT BIT(29)
65#define TEGRA_APBDMA_STATUS_PING_PONG BIT(28)
66#define TEGRA_APBDMA_STATUS_COUNT_SHIFT 2
67#define TEGRA_APBDMA_STATUS_COUNT_MASK 0xFFFC
68
1b140908
LD		 69#define TEGRA_APBDMA_CHAN_CSRE 0x00C
70#define TEGRA_APBDMA_CHAN_CSRE_PAUSE (1 << 31)
71
ec8a1586
LD		 72/* AHB memory address */
73#define TEGRA_APBDMA_CHAN_AHBPTR 0x010
74
75/* AHB sequence register */
76#define TEGRA_APBDMA_CHAN_AHBSEQ 0x14
77#define TEGRA_APBDMA_AHBSEQ_INTR_ENB BIT(31)
78#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_8 (0 << 28)
79#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_16 (1 << 28)
80#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32 (2 << 28)
81#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_64 (3 << 28)
82#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_128 (4 << 28)
83#define TEGRA_APBDMA_AHBSEQ_DATA_SWAP BIT(27)
84#define TEGRA_APBDMA_AHBSEQ_BURST_1 (4 << 24)
85#define TEGRA_APBDMA_AHBSEQ_BURST_4 (5 << 24)
86#define TEGRA_APBDMA_AHBSEQ_BURST_8 (6 << 24)
87#define TEGRA_APBDMA_AHBSEQ_DBL_BUF BIT(19)
88#define TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT 16
89#define TEGRA_APBDMA_AHBSEQ_WRAP_NONE 0
90
91/* APB address */
92#define TEGRA_APBDMA_CHAN_APBPTR 0x018
93
94/* APB sequence register */
95#define TEGRA_APBDMA_CHAN_APBSEQ 0x01c
96#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8 (0 << 28)
97#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16 (1 << 28)
98#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32 (2 << 28)
99#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64 (3 << 28)
100#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_128 (4 << 28)
101#define TEGRA_APBDMA_APBSEQ_DATA_SWAP BIT(27)
102#define TEGRA_APBDMA_APBSEQ_WRAP_WORD_1 (1 << 16)
103
911daccc
LD		 104/* Tegra148 specific registers */
105#define TEGRA_APBDMA_CHAN_WCOUNT 0x20
106
107#define TEGRA_APBDMA_CHAN_WORD_TRANSFER 0x24
108
ec8a1586
LD		 109/*
110 * If any burst is in flight and DMA paused then this is the time to complete
111 * on-flight burst and update DMA status register.
112 */
113#define TEGRA_APBDMA_BURST_COMPLETE_TIME 20
114
115/* Channel base address offset from APBDMA base address */
116#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
117
00ef4490
SSM		 118#define TEGRA_APBDMA_SLAVE_ID_INVALID (TEGRA_APBDMA_CSR_REQ_SEL_MASK + 1)
119
ec8a1586
LD		 120struct tegra_dma;
121
122/*
123 * tegra_dma_chip_data Tegra chip specific DMA data
124 * @nr_channels: Number of channels available in the controller.
911daccc 125 * @channel_reg_size: Channel register size/stride.
ec8a1586 126 * @max_dma_count: Maximum DMA transfer count supported by DMA controller.
1b140908 127 * @support_channel_pause: Support channel wise pause of dma.
911daccc 128 * @support_separate_wcount_reg: Support separate word count register.
ec8a1586
LD		 129 */
130struct tegra_dma_chip_data {
131 int nr_channels;
911daccc 132 int channel_reg_size;
ec8a1586 133 int max_dma_count;
1b140908 134 bool support_channel_pause;
911daccc 135 bool support_separate_wcount_reg;
ec8a1586
LD		 136};
137
138/* DMA channel registers */
139struct tegra_dma_channel_regs {
140 unsigned long csr;
141 unsigned long ahb_ptr;
142 unsigned long apb_ptr;
143 unsigned long ahb_seq;
144 unsigned long apb_seq;
911daccc 145 unsigned long wcount;
ec8a1586
LD		 146};
147
148/*
149 * tegra_dma_sg_req: Dma request details to configure hardware. This
150 * contains the details for one transfer to configure DMA hw.
151 * The client's request for data transfer can be broken into multiple
152 * sub-transfer as per requester details and hw support.
153 * This sub transfer get added in the list of transfer and point to Tegra
154 * DMA descriptor which manages the transfer details.
155 */
156struct tegra_dma_sg_req {
157 struct tegra_dma_channel_regs ch_regs;
158 int req_len;
159 bool configured;
160 bool last_sg;
ec8a1586
LD		 161 struct list_head node;
162 struct tegra_dma_desc *dma_desc;
163};
164
165/*
166 * tegra_dma_desc: Tegra DMA descriptors which manages the client requests.
167 * This descriptor keep track of transfer status, callbacks and request
168 * counts etc.
169 */
170struct tegra_dma_desc {
171 struct dma_async_tx_descriptor txd;
172 int bytes_requested;
173 int bytes_transferred;
174 enum dma_status dma_status;
175 struct list_head node;
176 struct list_head tx_list;
177 struct list_head cb_node;
178 int cb_count;
179};
180
181struct tegra_dma_channel;
182
183typedef void (*dma_isr_handler)(struct tegra_dma_channel *tdc,
184 bool to_terminate);
185
186/* tegra_dma_channel: Channel specific information */
187struct tegra_dma_channel {
188 struct dma_chan dma_chan;
d0fc9054 189 char name[30];
ec8a1586
LD		 190 bool config_init;
191 int id;
192 int irq;
13a33286 193 void __iomem *chan_addr;
ec8a1586
LD		 194 spinlock_t lock;
195 bool busy;
196 struct tegra_dma *tdma;
197 bool cyclic;
198
199 /* Different lists for managing the requests */
200 struct list_head free_sg_req;
201 struct list_head pending_sg_req;
202 struct list_head free_dma_desc;
203 struct list_head cb_desc;
204
205 /* ISR handler and tasklet for bottom half of isr handling */
206 dma_isr_handler isr_handler;
207 struct tasklet_struct tasklet;
ec8a1586
LD		 208
209 /* Channel-slave specific configuration */
996556c9 210 unsigned int slave_id;
ec8a1586 211 struct dma_slave_config dma_sconfig;
3065c194 212 struct tegra_dma_channel_regs channel_reg;
ec8a1586
LD		 213};
214
215/* tegra_dma: Tegra DMA specific information */
216struct tegra_dma {
217 struct dma_device dma_dev;
218 struct device *dev;
219 struct clk *dma_clk;
9aa433d2 220 struct reset_control *rst;
ec8a1586
LD		 221 spinlock_t global_lock;
222 void __iomem *base_addr;
83a1ef2e 223 const struct tegra_dma_chip_data *chip_data;
ec8a1586 224
23a1ec30
JH		 225 /*
226 * Counter for managing global pausing of the DMA controller.
227 * Only applicable for devices that don't support individual
228 * channel pausing.
229 */
230 u32 global_pause_count;
231
ec8a1586
LD		 232 /* Some register need to be cache before suspend */
233 u32 reg_gen;
234
235 /* Last member of the structure */
236 struct tegra_dma_channel channels[0];
237};
238
239static inline void tdma_write(struct tegra_dma *tdma, u32 reg, u32 val)
240{
241 writel(val, tdma->base_addr + reg);
242}
243
244static inline u32 tdma_read(struct tegra_dma *tdma, u32 reg)
245{
246 return readl(tdma->base_addr + reg);
247}
248
249static inline void tdc_write(struct tegra_dma_channel *tdc,
250 u32 reg, u32 val)
251{
13a33286 252 writel(val, tdc->chan_addr + reg);
ec8a1586
LD		 253}
254
255static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
256{
13a33286 257 return readl(tdc->chan_addr + reg);
ec8a1586
LD		 258}
259
260static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
261{
262 return container_of(dc, struct tegra_dma_channel, dma_chan);
263}
264
265static inline struct tegra_dma_desc *txd_to_tegra_dma_desc(
266 struct dma_async_tx_descriptor *td)
267{
268 return container_of(td, struct tegra_dma_desc, txd);
269}
270
271static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
272{
273 return &tdc->dma_chan.dev->device;
274}
275
276static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *tx);
277static int tegra_dma_runtime_suspend(struct device *dev);
278static int tegra_dma_runtime_resume(struct device *dev);
279
280/* Get DMA desc from free list, if not there then allocate it. */
281static struct tegra_dma_desc *tegra_dma_desc_get(
282 struct tegra_dma_channel *tdc)
283{
284 struct tegra_dma_desc *dma_desc;
285 unsigned long flags;
286
287 spin_lock_irqsave(&tdc->lock, flags);
288
289 /* Do not allocate if desc are waiting for ack */
290 list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
291 if (async_tx_test_ack(&dma_desc->txd)) {
292 list_del(&dma_desc->node);
293 spin_unlock_irqrestore(&tdc->lock, flags);
b9bb37f5 294 dma_desc->txd.flags = 0;
ec8a1586
LD		 295 return dma_desc;
296 }
297 }
298
299 spin_unlock_irqrestore(&tdc->lock, flags);
300
301 /* Allocate DMA desc */
8fe9739b 302 dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
aef94fea 303 if (!dma_desc)
ec8a1586 304 return NULL;
ec8a1586
LD		 305
306 dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan);
307 dma_desc->txd.tx_submit = tegra_dma_tx_submit;
308 dma_desc->txd.flags = 0;
309 return dma_desc;
310}
311
312static void tegra_dma_desc_put(struct tegra_dma_channel *tdc,
313 struct tegra_dma_desc *dma_desc)
314{
315 unsigned long flags;
316
317 spin_lock_irqsave(&tdc->lock, flags);
318 if (!list_empty(&dma_desc->tx_list))
319 list_splice_init(&dma_desc->tx_list, &tdc->free_sg_req);
320 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
321 spin_unlock_irqrestore(&tdc->lock, flags);
322}
323
324static struct tegra_dma_sg_req *tegra_dma_sg_req_get(
325 struct tegra_dma_channel *tdc)
326{
327 struct tegra_dma_sg_req *sg_req = NULL;
328 unsigned long flags;
329
330 spin_lock_irqsave(&tdc->lock, flags);
331 if (!list_empty(&tdc->free_sg_req)) {
332 sg_req = list_first_entry(&tdc->free_sg_req,
333 typeof(*sg_req), node);
334 list_del(&sg_req->node);
335 spin_unlock_irqrestore(&tdc->lock, flags);
336 return sg_req;
337 }
338 spin_unlock_irqrestore(&tdc->lock, flags);
339
8fe9739b 340 sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_NOWAIT);
aef94fea 341
ec8a1586
LD		 342 return sg_req;
343}
344
345static int tegra_dma_slave_config(struct dma_chan *dc,
346 struct dma_slave_config *sconfig)
347{
348 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
349
350 if (!list_empty(&tdc->pending_sg_req)) {
351 dev_err(tdc2dev(tdc), "Configuration not allowed\n");
352 return -EBUSY;
353 }
354
355 memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
00ef4490
SSM		 356 if (tdc->slave_id == TEGRA_APBDMA_SLAVE_ID_INVALID) {
357 if (sconfig->slave_id > TEGRA_APBDMA_CSR_REQ_SEL_MASK)
358 return -EINVAL;
996556c9 359 tdc->slave_id = sconfig->slave_id;
00ef4490 360 }
ec8a1586
LD		 361 tdc->config_init = true;
362 return 0;
363}
364
365static void tegra_dma_global_pause(struct tegra_dma_channel *tdc,
366 bool wait_for_burst_complete)
367{
368 struct tegra_dma *tdma = tdc->tdma;
369
370 spin_lock(&tdma->global_lock);
23a1ec30
JH		 371
372 if (tdc->tdma->global_pause_count == 0) {
373 tdma_write(tdma, TEGRA_APBDMA_GENERAL, 0);
374 if (wait_for_burst_complete)
375 udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
376 }
377
378 tdc->tdma->global_pause_count++;
379
380 spin_unlock(&tdma->global_lock);
ec8a1586
LD		 381}
382
383static void tegra_dma_global_resume(struct tegra_dma_channel *tdc)
384{
385 struct tegra_dma *tdma = tdc->tdma;
386
23a1ec30
JH		 387 spin_lock(&tdma->global_lock);
388
389 if (WARN_ON(tdc->tdma->global_pause_count == 0))
390 goto out;
391
392 if (--tdc->tdma->global_pause_count == 0)
393 tdma_write(tdma, TEGRA_APBDMA_GENERAL,
394 TEGRA_APBDMA_GENERAL_ENABLE);
395
396out:
ec8a1586
LD		 397 spin_unlock(&tdma->global_lock);
398}
399
1b140908
LD		 400static void tegra_dma_pause(struct tegra_dma_channel *tdc,
401 bool wait_for_burst_complete)
402{
403 struct tegra_dma *tdma = tdc->tdma;
404
405 if (tdma->chip_data->support_channel_pause) {
406 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE,
407 TEGRA_APBDMA_CHAN_CSRE_PAUSE);
408 if (wait_for_burst_complete)
409 udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
410 } else {
411 tegra_dma_global_pause(tdc, wait_for_burst_complete);
412 }
413}
414
415static void tegra_dma_resume(struct tegra_dma_channel *tdc)
416{
417 struct tegra_dma *tdma = tdc->tdma;
418
419 if (tdma->chip_data->support_channel_pause) {
420 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE, 0);
421 } else {
422 tegra_dma_global_resume(tdc);
423 }
424}
425
ec8a1586
LD		 426static void tegra_dma_stop(struct tegra_dma_channel *tdc)
427{
428 u32 csr;
429 u32 status;
430
431 /* Disable interrupts */
432 csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
433 csr &= ~TEGRA_APBDMA_CSR_IE_EOC;
434 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
435
436 /* Disable DMA */
437 csr &= ~TEGRA_APBDMA_CSR_ENB;
438 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
439
440 /* Clear interrupt status if it is there */
441 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
442 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
443 dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
444 tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
445 }
446 tdc->busy = false;
447}
448
449static void tegra_dma_start(struct tegra_dma_channel *tdc,
450 struct tegra_dma_sg_req *sg_req)
451{
452 struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
453
454 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, ch_regs->csr);
455 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_regs->apb_seq);
456 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_regs->apb_ptr);
457 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_regs->ahb_seq);
458 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_regs->ahb_ptr);
911daccc
LD		 459 if (tdc->tdma->chip_data->support_separate_wcount_reg)
460 tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT, ch_regs->wcount);
ec8a1586
LD		 461
462 /* Start DMA */
463 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
464 ch_regs->csr | TEGRA_APBDMA_CSR_ENB);
465}
466
467static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
468 struct tegra_dma_sg_req *nsg_req)
469{
470 unsigned long status;
471
472 /*
473 * The DMA controller reloads the new configuration for next transfer
474 * after last burst of current transfer completes.
475 * If there is no IEC status then this makes sure that last burst
476 * has not be completed. There may be case that last burst is on
477 * flight and so it can complete but because DMA is paused, it
478 * will not generates interrupt as well as not reload the new
479 * configuration.
480 * If there is already IEC status then interrupt handler need to
481 * load new configuration.
482 */
1b140908 483 tegra_dma_pause(tdc, false);
ec8a1586
LD		 484 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
485
486 /*
487 * If interrupt is pending then do nothing as the ISR will handle
488 * the programing for new request.
489 */
490 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
491 dev_err(tdc2dev(tdc),
492 "Skipping new configuration as interrupt is pending\n");
1b140908 493 tegra_dma_resume(tdc);
ec8a1586
LD		 494 return;
495 }
496
497 /* Safe to program new configuration */
498 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->ch_regs.apb_ptr);
499 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr);
911daccc
LD		 500 if (tdc->tdma->chip_data->support_separate_wcount_reg)
501 tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
502 nsg_req->ch_regs.wcount);
ec8a1586
LD		 503 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
504 nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
505 nsg_req->configured = true;
506
1b140908 507 tegra_dma_resume(tdc);
ec8a1586
LD		 508}
509
510static void tdc_start_head_req(struct tegra_dma_channel *tdc)
511{
512 struct tegra_dma_sg_req *sg_req;
513
514 if (list_empty(&tdc->pending_sg_req))
515 return;
516
517 sg_req = list_first_entry(&tdc->pending_sg_req,
518 typeof(*sg_req), node);
519 tegra_dma_start(tdc, sg_req);
520 sg_req->configured = true;
521 tdc->busy = true;
522}
523
524static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc)
525{
526 struct tegra_dma_sg_req *hsgreq;
527 struct tegra_dma_sg_req *hnsgreq;
528
529 if (list_empty(&tdc->pending_sg_req))
530 return;
531
532 hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
533 if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) {
534 hnsgreq = list_first_entry(&hsgreq->node,
535 typeof(*hnsgreq), node);
536 tegra_dma_configure_for_next(tdc, hnsgreq);
537 }
538}
539
540static inline int get_current_xferred_count(struct tegra_dma_channel *tdc,
541 struct tegra_dma_sg_req *sg_req, unsigned long status)
542{
543 return sg_req->req_len - (status & TEGRA_APBDMA_STATUS_COUNT_MASK) - 4;
544}
545
546static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
547{
548 struct tegra_dma_sg_req *sgreq;
549 struct tegra_dma_desc *dma_desc;
550
551 while (!list_empty(&tdc->pending_sg_req)) {
552 sgreq = list_first_entry(&tdc->pending_sg_req,
553 typeof(*sgreq), node);
2cc44e63 554 list_move_tail(&sgreq->node, &tdc->free_sg_req);
ec8a1586
LD		 555 if (sgreq->last_sg) {
556 dma_desc = sgreq->dma_desc;
557 dma_desc->dma_status = DMA_ERROR;
558 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
559
560 /* Add in cb list if it is not there. */
561 if (!dma_desc->cb_count)
562 list_add_tail(&dma_desc->cb_node,
563 &tdc->cb_desc);
564 dma_desc->cb_count++;
565 }
566 }
567 tdc->isr_handler = NULL;
568}
569
570static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
571 struct tegra_dma_sg_req *last_sg_req, bool to_terminate)
572{
573 struct tegra_dma_sg_req *hsgreq = NULL;
574
575 if (list_empty(&tdc->pending_sg_req)) {
576 dev_err(tdc2dev(tdc), "Dma is running without req\n");
577 tegra_dma_stop(tdc);
578 return false;
579 }
580
581 /*
582 * Check that head req on list should be in flight.
583 * If it is not in flight then abort transfer as
584 * looping of transfer can not continue.
585 */
586 hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
587 if (!hsgreq->configured) {
588 tegra_dma_stop(tdc);
589 dev_err(tdc2dev(tdc), "Error in dma transfer, aborting dma\n");
590 tegra_dma_abort_all(tdc);
591 return false;
592 }
593
594 /* Configure next request */
595 if (!to_terminate)
596 tdc_configure_next_head_desc(tdc);
597 return true;
598}
599
600static void handle_once_dma_done(struct tegra_dma_channel *tdc,
601 bool to_terminate)
602{
603 struct tegra_dma_sg_req *sgreq;
604 struct tegra_dma_desc *dma_desc;
605
606 tdc->busy = false;
607 sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
608 dma_desc = sgreq->dma_desc;
609 dma_desc->bytes_transferred += sgreq->req_len;
610
611 list_del(&sgreq->node);
612 if (sgreq->last_sg) {
00d696f5 613 dma_desc->dma_status = DMA_COMPLETE;
ec8a1586
LD		 614 dma_cookie_complete(&dma_desc->txd);
615 if (!dma_desc->cb_count)
616 list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
617 dma_desc->cb_count++;
618 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
619 }
620 list_add_tail(&sgreq->node, &tdc->free_sg_req);
621
622 /* Do not start DMA if it is going to be terminate */
623 if (to_terminate || list_empty(&tdc->pending_sg_req))
624 return;
625
626 tdc_start_head_req(tdc);
ec8a1586
LD		 627}
628
629static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc,
630 bool to_terminate)
631{
632 struct tegra_dma_sg_req *sgreq;
633 struct tegra_dma_desc *dma_desc;
634 bool st;
635
636 sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
637 dma_desc = sgreq->dma_desc;
638 dma_desc->bytes_transferred += sgreq->req_len;
639
640 /* Callback need to be call */
641 if (!dma_desc->cb_count)
642 list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
643 dma_desc->cb_count++;
644
645 /* If not last req then put at end of pending list */
646 if (!list_is_last(&sgreq->node, &tdc->pending_sg_req)) {
2cc44e63 647 list_move_tail(&sgreq->node, &tdc->pending_sg_req);
ec8a1586
LD		 648 sgreq->configured = false;
649 st = handle_continuous_head_request(tdc, sgreq, to_terminate);
650 if (!st)
651 dma_desc->dma_status = DMA_ERROR;
652 }
ec8a1586
LD		 653}
654
655static void tegra_dma_tasklet(unsigned long data)
656{
657 struct tegra_dma_channel *tdc = (struct tegra_dma_channel *)data;
658 dma_async_tx_callback callback = NULL;
659 void *callback_param = NULL;
660 struct tegra_dma_desc *dma_desc;
661 unsigned long flags;
662 int cb_count;
663
664 spin_lock_irqsave(&tdc->lock, flags);
665 while (!list_empty(&tdc->cb_desc)) {
666 dma_desc = list_first_entry(&tdc->cb_desc,
667 typeof(*dma_desc), cb_node);
668 list_del(&dma_desc->cb_node);
669 callback = dma_desc->txd.callback;
670 callback_param = dma_desc->txd.callback_param;
671 cb_count = dma_desc->cb_count;
672 dma_desc->cb_count = 0;
673 spin_unlock_irqrestore(&tdc->lock, flags);
674 while (cb_count-- && callback)
675 callback(callback_param);
676 spin_lock_irqsave(&tdc->lock, flags);
677 }
678 spin_unlock_irqrestore(&tdc->lock, flags);
679}
680
681static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
682{
683 struct tegra_dma_channel *tdc = dev_id;
684 unsigned long status;
685 unsigned long flags;
686
687 spin_lock_irqsave(&tdc->lock, flags);
688
689 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
690 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
691 tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
692 tdc->isr_handler(tdc, false);
693 tasklet_schedule(&tdc->tasklet);
694 spin_unlock_irqrestore(&tdc->lock, flags);
695 return IRQ_HANDLED;
696 }
697
698 spin_unlock_irqrestore(&tdc->lock, flags);
699 dev_info(tdc2dev(tdc),
700 "Interrupt already served status 0x%08lx\n", status);
701 return IRQ_NONE;
702}
703
704static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd)
705{
706 struct tegra_dma_desc *dma_desc = txd_to_tegra_dma_desc(txd);
707 struct tegra_dma_channel *tdc = to_tegra_dma_chan(txd->chan);
708 unsigned long flags;
709 dma_cookie_t cookie;
710
711 spin_lock_irqsave(&tdc->lock, flags);
712 dma_desc->dma_status = DMA_IN_PROGRESS;
713 cookie = dma_cookie_assign(&dma_desc->txd);
714 list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req);
715 spin_unlock_irqrestore(&tdc->lock, flags);
716 return cookie;
717}
718
719static void tegra_dma_issue_pending(struct dma_chan *dc)
720{
721 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
722 unsigned long flags;
723
724 spin_lock_irqsave(&tdc->lock, flags);
725 if (list_empty(&tdc->pending_sg_req)) {
726 dev_err(tdc2dev(tdc), "No DMA request\n");
727 goto end;
728 }
729 if (!tdc->busy) {
730 tdc_start_head_req(tdc);
731
732 /* Continuous single mode: Configure next req */
733 if (tdc->cyclic) {
734 /*
735 * Wait for 1 burst time for configure DMA for
736 * next transfer.
737 */
738 udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
739 tdc_configure_next_head_desc(tdc);
740 }
741 }
742end:
743 spin_unlock_irqrestore(&tdc->lock, flags);
ec8a1586
LD		 744}
745
a7c439a4 746static int tegra_dma_terminate_all(struct dma_chan *dc)
ec8a1586
LD		 747{
748 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
749 struct tegra_dma_sg_req *sgreq;
750 struct tegra_dma_desc *dma_desc;
751 unsigned long flags;
752 unsigned long status;
911daccc 753 unsigned long wcount;
ec8a1586
LD		 754 bool was_busy;
755
756 spin_lock_irqsave(&tdc->lock, flags);
757 if (list_empty(&tdc->pending_sg_req)) {
758 spin_unlock_irqrestore(&tdc->lock, flags);
a7c439a4 759 return 0;
ec8a1586
LD		 760 }
761
762 if (!tdc->busy)
763 goto skip_dma_stop;
764
765 /* Pause DMA before checking the queue status */
1b140908 766 tegra_dma_pause(tdc, true);
ec8a1586
LD		 767
768 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
769 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
770 dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__);
771 tdc->isr_handler(tdc, true);
772 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
773 }
911daccc
LD		 774 if (tdc->tdma->chip_data->support_separate_wcount_reg)
775 wcount = tdc_read(tdc, TEGRA_APBDMA_CHAN_WORD_TRANSFER);
776 else
777 wcount = status;
ec8a1586
LD		 778
779 was_busy = tdc->busy;
780 tegra_dma_stop(tdc);
781
782 if (!list_empty(&tdc->pending_sg_req) && was_busy) {
783 sgreq = list_first_entry(&tdc->pending_sg_req,
784 typeof(*sgreq), node);
785 sgreq->dma_desc->bytes_transferred +=
911daccc 786 get_current_xferred_count(tdc, sgreq, wcount);
ec8a1586 787 }
1b140908 788 tegra_dma_resume(tdc);
ec8a1586
LD		 789
790skip_dma_stop:
791 tegra_dma_abort_all(tdc);
792
793 while (!list_empty(&tdc->cb_desc)) {
794 dma_desc = list_first_entry(&tdc->cb_desc,
795 typeof(*dma_desc), cb_node);
796 list_del(&dma_desc->cb_node);
797 dma_desc->cb_count = 0;
798 }
799 spin_unlock_irqrestore(&tdc->lock, flags);
a7c439a4 800 return 0;
ec8a1586
LD		 801}
802
803static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
804 dma_cookie_t cookie, struct dma_tx_state *txstate)
805{
806 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
807 struct tegra_dma_desc *dma_desc;
808 struct tegra_dma_sg_req *sg_req;
809 enum dma_status ret;
810 unsigned long flags;
4a46ba36 811 unsigned int residual;
ec8a1586 812
ec8a1586 813 ret = dma_cookie_status(dc, cookie, txstate);
71f7e6cc 814 if (ret == DMA_COMPLETE || !txstate)
ec8a1586 815 return ret;
0a0aee20
AS		 816
817 spin_lock_irqsave(&tdc->lock, flags);
ec8a1586
LD		 818
819 /* Check on wait_ack desc status */
820 list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
821 if (dma_desc->txd.cookie == cookie) {
4a46ba36
LD		 822 residual = dma_desc->bytes_requested -
823 (dma_desc->bytes_transferred %
824 dma_desc->bytes_requested);
825 dma_set_residue(txstate, residual);
ec8a1586
LD		 826 ret = dma_desc->dma_status;
827 spin_unlock_irqrestore(&tdc->lock, flags);
828 return ret;
829 }
830 }
831
832 /* Check in pending list */
833 list_for_each_entry(sg_req, &tdc->pending_sg_req, node) {
834 dma_desc = sg_req->dma_desc;
835 if (dma_desc->txd.cookie == cookie) {
4a46ba36
LD		 836 residual = dma_desc->bytes_requested -
837 (dma_desc->bytes_transferred %
838 dma_desc->bytes_requested);
839 dma_set_residue(txstate, residual);
ec8a1586
LD		 840 ret = dma_desc->dma_status;
841 spin_unlock_irqrestore(&tdc->lock, flags);
842 return ret;
843 }
844 }
845
846 dev_dbg(tdc2dev(tdc), "cookie %d does not found\n", cookie);
847 spin_unlock_irqrestore(&tdc->lock, flags);
848 return ret;
849}
850
ec8a1586
LD		 851static inline int get_bus_width(struct tegra_dma_channel *tdc,
852 enum dma_slave_buswidth slave_bw)
853{
854 switch (slave_bw) {
855 case DMA_SLAVE_BUSWIDTH_1_BYTE:
856 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8;
857 case DMA_SLAVE_BUSWIDTH_2_BYTES:
858 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16;
859 case DMA_SLAVE_BUSWIDTH_4_BYTES:
860 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
861 case DMA_SLAVE_BUSWIDTH_8_BYTES:
862 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64;
863 default:
864 dev_warn(tdc2dev(tdc),
865 "slave bw is not supported, using 32bits\n");
866 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
867 }
868}
869
870static inline int get_burst_size(struct tegra_dma_channel *tdc,
871 u32 burst_size, enum dma_slave_buswidth slave_bw, int len)
872{
873 int burst_byte;
874 int burst_ahb_width;
875
876 /*
877 * burst_size from client is in terms of the bus_width.
878 * convert them into AHB memory width which is 4 byte.
879 */
880 burst_byte = burst_size * slave_bw;
881 burst_ahb_width = burst_byte / 4;
882
883 /* If burst size is 0 then calculate the burst size based on length */
884 if (!burst_ahb_width) {
885 if (len & 0xF)
886 return TEGRA_APBDMA_AHBSEQ_BURST_1;
887 else if ((len >> 4) & 0x1)
888 return TEGRA_APBDMA_AHBSEQ_BURST_4;
889 else
890 return TEGRA_APBDMA_AHBSEQ_BURST_8;
891 }
892 if (burst_ahb_width < 4)
893 return TEGRA_APBDMA_AHBSEQ_BURST_1;
894 else if (burst_ahb_width < 8)
895 return TEGRA_APBDMA_AHBSEQ_BURST_4;
896 else
897 return TEGRA_APBDMA_AHBSEQ_BURST_8;
898}
899
900static int get_transfer_param(struct tegra_dma_channel *tdc,
901 enum dma_transfer_direction direction, unsigned long *apb_addr,
902 unsigned long *apb_seq, unsigned long *csr, unsigned int *burst_size,
903 enum dma_slave_buswidth *slave_bw)
904{
905
906 switch (direction) {
907 case DMA_MEM_TO_DEV:
908 *apb_addr = tdc->dma_sconfig.dst_addr;
909 *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
910 *burst_size = tdc->dma_sconfig.dst_maxburst;
911 *slave_bw = tdc->dma_sconfig.dst_addr_width;
912 *csr = TEGRA_APBDMA_CSR_DIR;
913 return 0;
914
915 case DMA_DEV_TO_MEM:
916 *apb_addr = tdc->dma_sconfig.src_addr;
917 *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
918 *burst_size = tdc->dma_sconfig.src_maxburst;
919 *slave_bw = tdc->dma_sconfig.src_addr_width;
920 *csr = 0;
921 return 0;
922
923 default:
924 dev_err(tdc2dev(tdc), "Dma direction is not supported\n");
925 return -EINVAL;
926 }
927 return -EINVAL;
928}
929
911daccc
LD		 930static void tegra_dma_prep_wcount(struct tegra_dma_channel *tdc,
931 struct tegra_dma_channel_regs *ch_regs, u32 len)
932{
933 u32 len_field = (len - 4) & 0xFFFC;
934
935 if (tdc->tdma->chip_data->support_separate_wcount_reg)
936 ch_regs->wcount = len_field;
937 else
938 ch_regs->csr |= len_field;
939}
940
ec8a1586
LD		 941static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
942 struct dma_chan *dc, struct scatterlist *sgl, unsigned int sg_len,
943 enum dma_transfer_direction direction, unsigned long flags,
944 void *context)
945{
946 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
947 struct tegra_dma_desc *dma_desc;
948 unsigned int i;
949 struct scatterlist *sg;
950 unsigned long csr, ahb_seq, apb_ptr, apb_seq;
951 struct list_head req_list;
952 struct tegra_dma_sg_req *sg_req = NULL;
953 u32 burst_size;
954 enum dma_slave_buswidth slave_bw;
ec8a1586
LD		 955
956 if (!tdc->config_init) {
957 dev_err(tdc2dev(tdc), "dma channel is not configured\n");
958 return NULL;
959 }
960 if (sg_len < 1) {
961 dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
962 return NULL;
963 }
964
dc1ff4b3
JH		 965 if (get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
966 &burst_size, &slave_bw) < 0)
ec8a1586
LD		 967 return NULL;
968
969 INIT_LIST_HEAD(&req_list);
970
971 ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
972 ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
973 TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
974 ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
975
976 csr |= TEGRA_APBDMA_CSR_ONCE | TEGRA_APBDMA_CSR_FLOW;
996556c9 977 csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
ec8a1586
LD		 978 if (flags & DMA_PREP_INTERRUPT)
979 csr |= TEGRA_APBDMA_CSR_IE_EOC;
980
981 apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
982
983 dma_desc = tegra_dma_desc_get(tdc);
984 if (!dma_desc) {
985 dev_err(tdc2dev(tdc), "Dma descriptors not available\n");
986 return NULL;
987 }
988 INIT_LIST_HEAD(&dma_desc->tx_list);
989 INIT_LIST_HEAD(&dma_desc->cb_node);
990 dma_desc->cb_count = 0;
991 dma_desc->bytes_requested = 0;
992 dma_desc->bytes_transferred = 0;
993 dma_desc->dma_status = DMA_IN_PROGRESS;
994
995 /* Make transfer requests */
996 for_each_sg(sgl, sg, sg_len, i) {
997 u32 len, mem;
998
597c8549 999 mem = sg_dma_address(sg);
ec8a1586
LD		 1000 len = sg_dma_len(sg);
1001
1002 if ((len & 3) || (mem & 3) ||
1003 (len > tdc->tdma->chip_data->max_dma_count)) {
1004 dev_err(tdc2dev(tdc),
1005 "Dma length/memory address is not supported\n");
1006 tegra_dma_desc_put(tdc, dma_desc);
1007 return NULL;
1008 }
1009
1010 sg_req = tegra_dma_sg_req_get(tdc);
1011 if (!sg_req) {
1012 dev_err(tdc2dev(tdc), "Dma sg-req not available\n");
1013 tegra_dma_desc_put(tdc, dma_desc);
1014 return NULL;
1015 }
1016
1017 ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
1018 dma_desc->bytes_requested += len;
1019
1020 sg_req->ch_regs.apb_ptr = apb_ptr;
1021 sg_req->ch_regs.ahb_ptr = mem;
911daccc
LD		 1022 sg_req->ch_regs.csr = csr;
1023 tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len);
ec8a1586
LD		 1024 sg_req->ch_regs.apb_seq = apb_seq;
1025 sg_req->ch_regs.ahb_seq = ahb_seq;
1026 sg_req->configured = false;
1027 sg_req->last_sg = false;
1028 sg_req->dma_desc = dma_desc;
1029 sg_req->req_len = len;
1030
1031 list_add_tail(&sg_req->node, &dma_desc->tx_list);
1032 }
1033 sg_req->last_sg = true;
1034 if (flags & DMA_CTRL_ACK)
1035 dma_desc->txd.flags = DMA_CTRL_ACK;
1036
1037 /*
1038 * Make sure that mode should not be conflicting with currently
1039 * configured mode.
1040 */
1041 if (!tdc->isr_handler) {
1042 tdc->isr_handler = handle_once_dma_done;
1043 tdc->cyclic = false;
1044 } else {
1045 if (tdc->cyclic) {
1046 dev_err(tdc2dev(tdc), "DMA configured in cyclic mode\n");
1047 tegra_dma_desc_put(tdc, dma_desc);
1048 return NULL;
1049 }
1050 }
1051
1052 return &dma_desc->txd;
1053}
1054
404ff669 1055static struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
ec8a1586
LD		 1056 struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
1057 size_t period_len, enum dma_transfer_direction direction,
31c1e5a1 1058 unsigned long flags)
ec8a1586
LD		 1059{
1060 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
1061 struct tegra_dma_desc *dma_desc = NULL;
1062 struct tegra_dma_sg_req *sg_req = NULL;
1063 unsigned long csr, ahb_seq, apb_ptr, apb_seq;
1064 int len;
1065 size_t remain_len;
1066 dma_addr_t mem = buf_addr;
1067 u32 burst_size;
1068 enum dma_slave_buswidth slave_bw;
ec8a1586
LD		 1069
1070 if (!buf_len || !period_len) {
1071 dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
1072 return NULL;
1073 }
1074
1075 if (!tdc->config_init) {
1076 dev_err(tdc2dev(tdc), "DMA slave is not configured\n");
1077 return NULL;
1078 }
1079
1080 /*
1081 * We allow to take more number of requests till DMA is
1082 * not started. The driver will loop over all requests.
1083 * Once DMA is started then new requests can be queued only after
1084 * terminating the DMA.
1085 */
1086 if (tdc->busy) {
1087 dev_err(tdc2dev(tdc), "Request not allowed when dma running\n");
1088 return NULL;
1089 }
1090
1091 /*
1092 * We only support cycle transfer when buf_len is multiple of
1093 * period_len.
1094 */
1095 if (buf_len % period_len) {
1096 dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n");
1097 return NULL;
1098 }
1099
1100 len = period_len;
1101 if ((len & 3) || (buf_addr & 3) ||
1102 (len > tdc->tdma->chip_data->max_dma_count)) {
1103 dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n");
1104 return NULL;
1105 }
1106
dc1ff4b3
JH		 1107 if (get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
1108 &burst_size, &slave_bw) < 0)
ec8a1586
LD		 1109 return NULL;
1110
ec8a1586
LD		 1111 ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
1112 ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
1113 TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
1114 ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
1115
b9bb37f5
LD		 1116 csr |= TEGRA_APBDMA_CSR_FLOW;
1117 if (flags & DMA_PREP_INTERRUPT)
1118 csr |= TEGRA_APBDMA_CSR_IE_EOC;
996556c9 1119 csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
ec8a1586
LD		 1120
1121 apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
1122
1123 dma_desc = tegra_dma_desc_get(tdc);
1124 if (!dma_desc) {
1125 dev_err(tdc2dev(tdc), "not enough descriptors available\n");
1126 return NULL;
1127 }
1128
1129 INIT_LIST_HEAD(&dma_desc->tx_list);
1130 INIT_LIST_HEAD(&dma_desc->cb_node);
1131 dma_desc->cb_count = 0;
1132
1133 dma_desc->bytes_transferred = 0;
1134 dma_desc->bytes_requested = buf_len;
1135 remain_len = buf_len;
1136
1137 /* Split transfer equal to period size */
1138 while (remain_len) {
1139 sg_req = tegra_dma_sg_req_get(tdc);
1140 if (!sg_req) {
1141 dev_err(tdc2dev(tdc), "Dma sg-req not available\n");
1142 tegra_dma_desc_put(tdc, dma_desc);
1143 return NULL;
1144 }
1145
1146 ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
1147 sg_req->ch_regs.apb_ptr = apb_ptr;
1148 sg_req->ch_regs.ahb_ptr = mem;
911daccc
LD		 1149 sg_req->ch_regs.csr = csr;
1150 tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len);
ec8a1586
LD		 1151 sg_req->ch_regs.apb_seq = apb_seq;
1152 sg_req->ch_regs.ahb_seq = ahb_seq;
1153 sg_req->configured = false;
ec8a1586
LD		 1154 sg_req->last_sg = false;
1155 sg_req->dma_desc = dma_desc;
1156 sg_req->req_len = len;
1157
1158 list_add_tail(&sg_req->node, &dma_desc->tx_list);
1159 remain_len -= len;
1160 mem += len;
1161 }
1162 sg_req->last_sg = true;
b9bb37f5
LD		 1163 if (flags & DMA_CTRL_ACK)
1164 dma_desc->txd.flags = DMA_CTRL_ACK;
ec8a1586
LD		 1165
1166 /*
1167 * Make sure that mode should not be conflicting with currently
1168 * configured mode.
1169 */
1170 if (!tdc->isr_handler) {
1171 tdc->isr_handler = handle_cont_sngl_cycle_dma_done;
1172 tdc->cyclic = true;
1173 } else {
1174 if (!tdc->cyclic) {
1175 dev_err(tdc2dev(tdc), "DMA configuration conflict\n");
1176 tegra_dma_desc_put(tdc, dma_desc);
1177 return NULL;
1178 }
1179 }
1180
1181 return &dma_desc->txd;
1182}
1183
1184static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
1185{
1186 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
ffc49306
LD		 1187 struct tegra_dma *tdma = tdc->tdma;
1188 int ret;
ec8a1586
LD		 1189
1190 dma_cookie_init(&tdc->dma_chan);
1191 tdc->config_init = false;
edd3bdbe
JH		 1192
1193 ret = pm_runtime_get_sync(tdma->dev);
ffc49306 1194 if (ret < 0)
edd3bdbe
JH		 1195 return ret;
1196
1197 return 0;
ec8a1586
LD		 1198}
1199
1200static void tegra_dma_free_chan_resources(struct dma_chan *dc)
1201{
1202 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
ffc49306 1203 struct tegra_dma *tdma = tdc->tdma;
ec8a1586
LD		 1204
1205 struct tegra_dma_desc *dma_desc;
1206 struct tegra_dma_sg_req *sg_req;
1207 struct list_head dma_desc_list;
1208 struct list_head sg_req_list;
1209 unsigned long flags;
1210
1211 INIT_LIST_HEAD(&dma_desc_list);
1212 INIT_LIST_HEAD(&sg_req_list);
1213
1214 dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
1215
1216 if (tdc->busy)
1217 tegra_dma_terminate_all(dc);
1218
1219 spin_lock_irqsave(&tdc->lock, flags);
1220 list_splice_init(&tdc->pending_sg_req, &sg_req_list);
1221 list_splice_init(&tdc->free_sg_req, &sg_req_list);
1222 list_splice_init(&tdc->free_dma_desc, &dma_desc_list);
1223 INIT_LIST_HEAD(&tdc->cb_desc);
1224 tdc->config_init = false;
7bdc1e27 1225 tdc->isr_handler = NULL;
ec8a1586
LD		 1226 spin_unlock_irqrestore(&tdc->lock, flags);
1227
1228 while (!list_empty(&dma_desc_list)) {
1229 dma_desc = list_first_entry(&dma_desc_list,
1230 typeof(*dma_desc), node);
1231 list_del(&dma_desc->node);
1232 kfree(dma_desc);
1233 }
1234
1235 while (!list_empty(&sg_req_list)) {
1236 sg_req = list_first_entry(&sg_req_list, typeof(*sg_req), node);
1237 list_del(&sg_req->node);
1238 kfree(sg_req);
1239 }
edd3bdbe 1240 pm_runtime_put(tdma->dev);
996556c9 1241
00ef4490 1242 tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
996556c9
SW		 1243}
1244
1245static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
1246 struct of_dma *ofdma)
1247{
1248 struct tegra_dma *tdma = ofdma->of_dma_data;
1249 struct dma_chan *chan;
1250 struct tegra_dma_channel *tdc;
1251
00ef4490
SSM		 1252 if (dma_spec->args[0] > TEGRA_APBDMA_CSR_REQ_SEL_MASK) {
1253 dev_err(tdma->dev, "Invalid slave id: %d\n", dma_spec->args[0]);
1254 return NULL;
1255 }
1256
996556c9
SW		 1257 chan = dma_get_any_slave_channel(&tdma->dma_dev);
1258 if (!chan)
1259 return NULL;
1260
1261 tdc = to_tegra_dma_chan(chan);
1262 tdc->slave_id = dma_spec->args[0];
1263
1264 return chan;
ec8a1586
LD		 1265}
1266
1267/* Tegra20 specific DMA controller information */
75f21631 1268static const struct tegra_dma_chip_data tegra20_dma_chip_data = {
ec8a1586 1269 .nr_channels = 16,
911daccc 1270 .channel_reg_size = 0x20,
ec8a1586 1271 .max_dma_count = 1024UL * 64,
1b140908 1272 .support_channel_pause = false,
911daccc 1273 .support_separate_wcount_reg = false,
ec8a1586
LD		 1274};
1275
ec8a1586 1276/* Tegra30 specific DMA controller information */
75f21631 1277static const struct tegra_dma_chip_data tegra30_dma_chip_data = {
ec8a1586 1278 .nr_channels = 32,
911daccc 1279 .channel_reg_size = 0x20,
ec8a1586 1280 .max_dma_count = 1024UL * 64,
1b140908 1281 .support_channel_pause = false,
911daccc 1282 .support_separate_wcount_reg = false,
ec8a1586
LD		 1283};
1284
5ea7caf3
LD		 1285/* Tegra114 specific DMA controller information */
1286static const struct tegra_dma_chip_data tegra114_dma_chip_data = {
1287 .nr_channels = 32,
911daccc 1288 .channel_reg_size = 0x20,
5ea7caf3
LD		 1289 .max_dma_count = 1024UL * 64,
1290 .support_channel_pause = true,
911daccc
LD		 1291 .support_separate_wcount_reg = false,
1292};
1293
1294/* Tegra148 specific DMA controller information */
1295static const struct tegra_dma_chip_data tegra148_dma_chip_data = {
1296 .nr_channels = 32,
1297 .channel_reg_size = 0x40,
1298 .max_dma_count = 1024UL * 64,
1299 .support_channel_pause = true,
1300 .support_separate_wcount_reg = true,
5ea7caf3
LD		 1301};
1302
463a1f8b 1303static int tegra_dma_probe(struct platform_device *pdev)
ec8a1586
LD		 1304{
1305 struct resource *res;
1306 struct tegra_dma *tdma;
1307 int ret;
1308 int i;
333f16ec 1309 const struct tegra_dma_chip_data *cdata;
ec8a1586 1310
333f16ec
LD		 1311 cdata = of_device_get_match_data(&pdev->dev);
1312 if (!cdata) {
1313 dev_err(&pdev->dev, "Error: No device match data found\n");
dc7badba 1314 return -ENODEV;
ec8a1586
LD		 1315 }
1316
1317 tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
1318 sizeof(struct tegra_dma_channel), GFP_KERNEL);
aef94fea 1319 if (!tdma)
ec8a1586 1320 return -ENOMEM;
ec8a1586
LD		 1321
1322 tdma->dev = &pdev->dev;
1323 tdma->chip_data = cdata;
1324 platform_set_drvdata(pdev, tdma);
1325
1326 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
7331205a
TR		 1327 tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
1328 if (IS_ERR(tdma->base_addr))
1329 return PTR_ERR(tdma->base_addr);
ec8a1586
LD		 1330
1331 tdma->dma_clk = devm_clk_get(&pdev->dev, NULL);
1332 if (IS_ERR(tdma->dma_clk)) {
1333 dev_err(&pdev->dev, "Error: Missing controller clock\n");
1334 return PTR_ERR(tdma->dma_clk);
1335 }
1336
9aa433d2
SW		 1337 tdma->rst = devm_reset_control_get(&pdev->dev, "dma");
1338 if (IS_ERR(tdma->rst)) {
1339 dev_err(&pdev->dev, "Error: Missing reset\n");
1340 return PTR_ERR(tdma->rst);
1341 }
1342
ec8a1586
LD		 1343 spin_lock_init(&tdma->global_lock);
1344
1345 pm_runtime_enable(&pdev->dev);
edd3bdbe 1346 if (!pm_runtime_enabled(&pdev->dev))
ec8a1586 1347 ret = tegra_dma_runtime_resume(&pdev->dev);
edd3bdbe
JH		 1348 else
1349 ret = pm_runtime_get_sync(&pdev->dev);
ec8a1586 1350
ffc49306 1351 if (ret < 0) {
edd3bdbe
JH		 1352 pm_runtime_disable(&pdev->dev);
1353 return ret;
ffc49306
LD		 1354 }
1355
ec8a1586 1356 /* Reset DMA controller */
9aa433d2 1357 reset_control_assert(tdma->rst);
ec8a1586 1358 udelay(2);
9aa433d2 1359 reset_control_deassert(tdma->rst);
ec8a1586
LD		 1360
1361 /* Enable global DMA registers */
1362 tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
1363 tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);
1364 tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul);
1365
edd3bdbe 1366 pm_runtime_put(&pdev->dev);
ffc49306 1367
ec8a1586
LD		 1368 INIT_LIST_HEAD(&tdma->dma_dev.channels);
1369 for (i = 0; i < cdata->nr_channels; i++) {
1370 struct tegra_dma_channel *tdc = &tdma->channels[i];
ec8a1586 1371
13a33286
JH		 1372 tdc->chan_addr = tdma->base_addr +
1373 TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET +
1374 (i * cdata->channel_reg_size);
ec8a1586
LD		 1375
1376 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
1377 if (!res) {
1378 ret = -EINVAL;
1379 dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
1380 goto err_irq;
1381 }
1382 tdc->irq = res->start;
d0fc9054 1383 snprintf(tdc->name, sizeof(tdc->name), "apbdma.%d", i);
05e866b4 1384 ret = request_irq(tdc->irq, tegra_dma_isr, 0, tdc->name, tdc);
ec8a1586
LD		 1385 if (ret) {
1386 dev_err(&pdev->dev,
1387 "request_irq failed with err %d channel %d\n",
ac7ae754 1388 ret, i);
ec8a1586
LD		 1389 goto err_irq;
1390 }
1391
1392 tdc->dma_chan.device = &tdma->dma_dev;
1393 dma_cookie_init(&tdc->dma_chan);
1394 list_add_tail(&tdc->dma_chan.device_node,
1395 &tdma->dma_dev.channels);
1396 tdc->tdma = tdma;
1397 tdc->id = i;
00ef4490 1398 tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
ec8a1586
LD		 1399
1400 tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
1401 (unsigned long)tdc);
1402 spin_lock_init(&tdc->lock);
1403
1404 INIT_LIST_HEAD(&tdc->pending_sg_req);
1405 INIT_LIST_HEAD(&tdc->free_sg_req);
1406 INIT_LIST_HEAD(&tdc->free_dma_desc);
1407 INIT_LIST_HEAD(&tdc->cb_desc);
1408 }
1409
1410 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
1411 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
46fb3f8e
LD		 1412 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
1413
23a1ec30 1414 tdma->global_pause_count = 0;
ec8a1586
LD		 1415 tdma->dma_dev.dev = &pdev->dev;
1416 tdma->dma_dev.device_alloc_chan_resources =
1417 tegra_dma_alloc_chan_resources;
1418 tdma->dma_dev.device_free_chan_resources =
1419 tegra_dma_free_chan_resources;
1420 tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
1421 tdma->dma_dev.device_prep_dma_cyclic = tegra_dma_prep_dma_cyclic;
891653ab
PW		 1422 tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1423 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1424 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1425 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
1426 tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
1427 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
1428 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |
1429 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES);
1430 tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
1431 /*
1432 * XXX The hardware appears to support
1433 * DMA_RESIDUE_GRANULARITY_BURST-level reporting, but it's
1434 * only used by this driver during tegra_dma_terminate_all()
1435 */
1436 tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
662f1ac3
MR		 1437 tdma->dma_dev.device_config = tegra_dma_slave_config;
1438 tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all;
ec8a1586
LD		 1439 tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
1440 tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
1441
1442 ret = dma_async_device_register(&tdma->dma_dev);
1443 if (ret < 0) {
1444 dev_err(&pdev->dev,
1445 "Tegra20 APB DMA driver registration failed %d\n", ret);
1446 goto err_irq;
1447 }
1448
996556c9
SW		 1449 ret = of_dma_controller_register(pdev->dev.of_node,
1450 tegra_dma_of_xlate, tdma);
1451 if (ret < 0) {
1452 dev_err(&pdev->dev,
1453 "Tegra20 APB DMA OF registration failed %d\n", ret);
1454 goto err_unregister_dma_dev;
1455 }
1456
ec8a1586
LD		 1457 dev_info(&pdev->dev, "Tegra20 APB DMA driver register %d channels\n",
1458 cdata->nr_channels);
1459 return 0;
1460
996556c9
SW		 1461err_unregister_dma_dev:
1462 dma_async_device_unregister(&tdma->dma_dev);
ec8a1586
LD		 1463err_irq:
1464 while (--i >= 0) {
1465 struct tegra_dma_channel *tdc = &tdma->channels[i];
05e866b4
JH		 1466
1467 free_irq(tdc->irq, tdc);
ec8a1586
LD		 1468 tasklet_kill(&tdc->tasklet);
1469 }
1470
ec8a1586
LD		 1471 pm_runtime_disable(&pdev->dev);
1472 if (!pm_runtime_status_suspended(&pdev->dev))
1473 tegra_dma_runtime_suspend(&pdev->dev);
1474 return ret;
1475}
1476
4bf27b8b 1477static int tegra_dma_remove(struct platform_device *pdev)
ec8a1586
LD		 1478{
1479 struct tegra_dma *tdma = platform_get_drvdata(pdev);
1480 int i;
1481 struct tegra_dma_channel *tdc;
1482
1483 dma_async_device_unregister(&tdma->dma_dev);
1484
1485 for (i = 0; i < tdma->chip_data->nr_channels; ++i) {
1486 tdc = &tdma->channels[i];
05e866b4 1487 free_irq(tdc->irq, tdc);
ec8a1586
LD		 1488 tasklet_kill(&tdc->tasklet);
1489 }
1490
1491 pm_runtime_disable(&pdev->dev);
1492 if (!pm_runtime_status_suspended(&pdev->dev))
1493 tegra_dma_runtime_suspend(&pdev->dev);
1494
1495 return 0;
1496}
1497
1498static int tegra_dma_runtime_suspend(struct device *dev)
1499{
286a6441 1500 struct tegra_dma *tdma = dev_get_drvdata(dev);
ec8a1586 1501
56482ec0 1502 clk_disable_unprepare(tdma->dma_clk);
ec8a1586
LD		 1503 return 0;
1504}
1505
1506static int tegra_dma_runtime_resume(struct device *dev)
1507{
286a6441 1508 struct tegra_dma *tdma = dev_get_drvdata(dev);
ec8a1586
LD		 1509 int ret;
1510
56482ec0 1511 ret = clk_prepare_enable(tdma->dma_clk);
ec8a1586
LD		 1512 if (ret < 0) {
1513 dev_err(dev, "clk_enable failed: %d\n", ret);
1514 return ret;
1515 }
1516 return 0;
1517}
1518
3065c194
LD		 1519#ifdef CONFIG_PM_SLEEP
1520static int tegra_dma_pm_suspend(struct device *dev)
1521{
1522 struct tegra_dma *tdma = dev_get_drvdata(dev);
1523 int i;
1524 int ret;
1525
1526 /* Enable clock before accessing register */
edd3bdbe 1527 ret = pm_runtime_get_sync(dev);
3065c194
LD		 1528 if (ret < 0)
1529 return ret;
1530
1531 tdma->reg_gen = tdma_read(tdma, TEGRA_APBDMA_GENERAL);
1532 for (i = 0; i < tdma->chip_data->nr_channels; i++) {
1533 struct tegra_dma_channel *tdc = &tdma->channels[i];
1534 struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
1535
4aad5be0
JH		 1536 /* Only save the state of DMA channels that are in use */
1537 if (!tdc->config_init)
1538 continue;
1539
3065c194
LD		 1540 ch_reg->csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
1541 ch_reg->ahb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBPTR);
1542 ch_reg->apb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBPTR);
1543 ch_reg->ahb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBSEQ);
1544 ch_reg->apb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBSEQ);
68ae7a93
JH		 1545 if (tdma->chip_data->support_separate_wcount_reg)
1546 ch_reg->wcount = tdc_read(tdc,
1547 TEGRA_APBDMA_CHAN_WCOUNT);
3065c194
LD		 1548 }
1549
1550 /* Disable clock */
edd3bdbe 1551 pm_runtime_put(dev);
3065c194
LD		 1552 return 0;
1553}
1554
1555static int tegra_dma_pm_resume(struct device *dev)
1556{
1557 struct tegra_dma *tdma = dev_get_drvdata(dev);
1558 int i;
1559 int ret;
1560
1561 /* Enable clock before accessing register */
edd3bdbe 1562 ret = pm_runtime_get_sync(dev);
3065c194
LD		 1563 if (ret < 0)
1564 return ret;
1565
1566 tdma_write(tdma, TEGRA_APBDMA_GENERAL, tdma->reg_gen);
1567 tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);
1568 tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul);
1569
1570 for (i = 0; i < tdma->chip_data->nr_channels; i++) {
1571 struct tegra_dma_channel *tdc = &tdma->channels[i];
1572 struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
1573
4aad5be0
JH		 1574 /* Only restore the state of DMA channels that are in use */
1575 if (!tdc->config_init)
1576 continue;
1577
68ae7a93
JH		 1578 if (tdma->chip_data->support_separate_wcount_reg)
1579 tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
1580 ch_reg->wcount);
3065c194
LD		 1581 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_reg->apb_seq);
1582 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_reg->apb_ptr);
1583 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_reg->ahb_seq);
1584 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_reg->ahb_ptr);
1585 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
1586 (ch_reg->csr & ~TEGRA_APBDMA_CSR_ENB));
1587 }
1588
1589 /* Disable clock */
edd3bdbe 1590 pm_runtime_put(dev);
3065c194
LD		 1591 return 0;
1592}
1593#endif
1594
4bf27b8b 1595static const struct dev_pm_ops tegra_dma_dev_pm_ops = {
edd3bdbe
JH		 1596 SET_RUNTIME_PM_OPS(tegra_dma_runtime_suspend, tegra_dma_runtime_resume,
1597 NULL)
3065c194 1598 SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume)
ec8a1586
LD		 1599};
1600
242637ba
LD		 1601static const struct of_device_id tegra_dma_of_match[] = {
1602 {
1603 .compatible = "nvidia,tegra148-apbdma",
1604 .data = &tegra148_dma_chip_data,
1605 }, {
1606 .compatible = "nvidia,tegra114-apbdma",
1607 .data = &tegra114_dma_chip_data,
1608 }, {
1609 .compatible = "nvidia,tegra30-apbdma",
1610 .data = &tegra30_dma_chip_data,
1611 }, {
1612 .compatible = "nvidia,tegra20-apbdma",
1613 .data = &tegra20_dma_chip_data,
1614 }, {
1615 },
1616};
1617MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
1618
ec8a1586
LD		 1619static struct platform_driver tegra_dmac_driver = {
1620 .driver = {
cd9092c6 1621 .name = "tegra-apbdma",
ec8a1586 1622 .pm = &tegra_dma_dev_pm_ops,
dc7badba 1623 .of_match_table = tegra_dma_of_match,
ec8a1586
LD		 1624 },
1625 .probe = tegra_dma_probe,
a7d6e3ec 1626 .remove = tegra_dma_remove,
ec8a1586
LD		 1627};
1628
1629module_platform_driver(tegra_dmac_driver);
1630
1631MODULE_ALIAS("platform:tegra20-apbdma");
1632MODULE_DESCRIPTION("NVIDIA Tegra APB DMA Controller driver");
1633MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
1634MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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