blob: 528c62dd4b00e1b52928ff66f3a54e7ae206680f [file] [log] [blame]
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301/*
2 * DMA driver for Nvidia's Tegra20 APB DMA controller.
3 *
4 * Copyright (c) 2012, 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/bitops.h>
20#include <linux/clk.h>
21#include <linux/delay.h>
22#include <linux/dmaengine.h>
23#include <linux/dma-mapping.h>
24#include <linux/init.h>
25#include <linux/interrupt.h>
26#include <linux/io.h>
27#include <linux/mm.h>
28#include <linux/module.h>
29#include <linux/of.h>
30#include <linux/of_device.h>
31#include <linux/platform_device.h>
32#include <linux/pm_runtime.h>
33#include <linux/slab.h>
34
35#include <mach/clk.h>
36#include "dmaengine.h"
37
38#define TEGRA_APBDMA_GENERAL 0x0
39#define TEGRA_APBDMA_GENERAL_ENABLE BIT(31)
40
41#define TEGRA_APBDMA_CONTROL 0x010
42#define TEGRA_APBDMA_IRQ_MASK 0x01c
43#define TEGRA_APBDMA_IRQ_MASK_SET 0x020
44
45/* CSR register */
46#define TEGRA_APBDMA_CHAN_CSR 0x00
47#define TEGRA_APBDMA_CSR_ENB BIT(31)
48#define TEGRA_APBDMA_CSR_IE_EOC BIT(30)
49#define TEGRA_APBDMA_CSR_HOLD BIT(29)
50#define TEGRA_APBDMA_CSR_DIR BIT(28)
51#define TEGRA_APBDMA_CSR_ONCE BIT(27)
52#define TEGRA_APBDMA_CSR_FLOW BIT(21)
53#define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16
54#define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC
55
56/* STATUS register */
57#define TEGRA_APBDMA_CHAN_STATUS 0x004
58#define TEGRA_APBDMA_STATUS_BUSY BIT(31)
59#define TEGRA_APBDMA_STATUS_ISE_EOC BIT(30)
60#define TEGRA_APBDMA_STATUS_HALT BIT(29)
61#define TEGRA_APBDMA_STATUS_PING_PONG BIT(28)
62#define TEGRA_APBDMA_STATUS_COUNT_SHIFT 2
63#define TEGRA_APBDMA_STATUS_COUNT_MASK 0xFFFC
64
65/* AHB memory address */
66#define TEGRA_APBDMA_CHAN_AHBPTR 0x010
67
68/* AHB sequence register */
69#define TEGRA_APBDMA_CHAN_AHBSEQ 0x14
70#define TEGRA_APBDMA_AHBSEQ_INTR_ENB BIT(31)
71#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_8 (0 << 28)
72#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_16 (1 << 28)
73#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32 (2 << 28)
74#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_64 (3 << 28)
75#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_128 (4 << 28)
76#define TEGRA_APBDMA_AHBSEQ_DATA_SWAP BIT(27)
77#define TEGRA_APBDMA_AHBSEQ_BURST_1 (4 << 24)
78#define TEGRA_APBDMA_AHBSEQ_BURST_4 (5 << 24)
79#define TEGRA_APBDMA_AHBSEQ_BURST_8 (6 << 24)
80#define TEGRA_APBDMA_AHBSEQ_DBL_BUF BIT(19)
81#define TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT 16
82#define TEGRA_APBDMA_AHBSEQ_WRAP_NONE 0
83
84/* APB address */
85#define TEGRA_APBDMA_CHAN_APBPTR 0x018
86
87/* APB sequence register */
88#define TEGRA_APBDMA_CHAN_APBSEQ 0x01c
89#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8 (0 << 28)
90#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16 (1 << 28)
91#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32 (2 << 28)
92#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64 (3 << 28)
93#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_128 (4 << 28)
94#define TEGRA_APBDMA_APBSEQ_DATA_SWAP BIT(27)
95#define TEGRA_APBDMA_APBSEQ_WRAP_WORD_1 (1 << 16)
96
97/*
98 * If any burst is in flight and DMA paused then this is the time to complete
99 * on-flight burst and update DMA status register.
100 */
101#define TEGRA_APBDMA_BURST_COMPLETE_TIME 20
102
103/* Channel base address offset from APBDMA base address */
104#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
105
106/* DMA channel register space size */
107#define TEGRA_APBDMA_CHANNEL_REGISTER_SIZE 0x20
108
109struct tegra_dma;
110
111/*
112 * tegra_dma_chip_data Tegra chip specific DMA data
113 * @nr_channels: Number of channels available in the controller.
114 * @max_dma_count: Maximum DMA transfer count supported by DMA controller.
115 */
116struct tegra_dma_chip_data {
117 int nr_channels;
118 int max_dma_count;
119};
120
121/* DMA channel registers */
122struct tegra_dma_channel_regs {
123 unsigned long csr;
124 unsigned long ahb_ptr;
125 unsigned long apb_ptr;
126 unsigned long ahb_seq;
127 unsigned long apb_seq;
128};
129
130/*
131 * tegra_dma_sg_req: Dma request details to configure hardware. This
132 * contains the details for one transfer to configure DMA hw.
133 * The client's request for data transfer can be broken into multiple
134 * sub-transfer as per requester details and hw support.
135 * This sub transfer get added in the list of transfer and point to Tegra
136 * DMA descriptor which manages the transfer details.
137 */
138struct tegra_dma_sg_req {
139 struct tegra_dma_channel_regs ch_regs;
140 int req_len;
141 bool configured;
142 bool last_sg;
143 bool half_done;
144 struct list_head node;
145 struct tegra_dma_desc *dma_desc;
146};
147
148/*
149 * tegra_dma_desc: Tegra DMA descriptors which manages the client requests.
150 * This descriptor keep track of transfer status, callbacks and request
151 * counts etc.
152 */
153struct tegra_dma_desc {
154 struct dma_async_tx_descriptor txd;
155 int bytes_requested;
156 int bytes_transferred;
157 enum dma_status dma_status;
158 struct list_head node;
159 struct list_head tx_list;
160 struct list_head cb_node;
161 int cb_count;
162};
163
164struct tegra_dma_channel;
165
166typedef void (*dma_isr_handler)(struct tegra_dma_channel *tdc,
167 bool to_terminate);
168
169/* tegra_dma_channel: Channel specific information */
170struct tegra_dma_channel {
171 struct dma_chan dma_chan;
Laxman Dewangand0fc9052012-10-03 22:48:07 +0530172 char name[30];
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530173 bool config_init;
174 int id;
175 int irq;
176 unsigned long chan_base_offset;
177 spinlock_t lock;
178 bool busy;
179 struct tegra_dma *tdma;
180 bool cyclic;
181
182 /* Different lists for managing the requests */
183 struct list_head free_sg_req;
184 struct list_head pending_sg_req;
185 struct list_head free_dma_desc;
186 struct list_head cb_desc;
187
188 /* ISR handler and tasklet for bottom half of isr handling */
189 dma_isr_handler isr_handler;
190 struct tasklet_struct tasklet;
191 dma_async_tx_callback callback;
192 void *callback_param;
193
194 /* Channel-slave specific configuration */
195 struct dma_slave_config dma_sconfig;
196};
197
198/* tegra_dma: Tegra DMA specific information */
199struct tegra_dma {
200 struct dma_device dma_dev;
201 struct device *dev;
202 struct clk *dma_clk;
203 spinlock_t global_lock;
204 void __iomem *base_addr;
Laxman Dewangan83a1ef22012-08-29 10:23:07 +0200205 const struct tegra_dma_chip_data *chip_data;
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530206
207 /* Some register need to be cache before suspend */
208 u32 reg_gen;
209
210 /* Last member of the structure */
211 struct tegra_dma_channel channels[0];
212};
213
214static inline void tdma_write(struct tegra_dma *tdma, u32 reg, u32 val)
215{
216 writel(val, tdma->base_addr + reg);
217}
218
219static inline u32 tdma_read(struct tegra_dma *tdma, u32 reg)
220{
221 return readl(tdma->base_addr + reg);
222}
223
224static inline void tdc_write(struct tegra_dma_channel *tdc,
225 u32 reg, u32 val)
226{
227 writel(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg);
228}
229
230static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
231{
232 return readl(tdc->tdma->base_addr + tdc->chan_base_offset + reg);
233}
234
235static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
236{
237 return container_of(dc, struct tegra_dma_channel, dma_chan);
238}
239
240static inline struct tegra_dma_desc *txd_to_tegra_dma_desc(
241 struct dma_async_tx_descriptor *td)
242{
243 return container_of(td, struct tegra_dma_desc, txd);
244}
245
246static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
247{
248 return &tdc->dma_chan.dev->device;
249}
250
251static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *tx);
252static int tegra_dma_runtime_suspend(struct device *dev);
253static int tegra_dma_runtime_resume(struct device *dev);
254
255/* Get DMA desc from free list, if not there then allocate it. */
256static struct tegra_dma_desc *tegra_dma_desc_get(
257 struct tegra_dma_channel *tdc)
258{
259 struct tegra_dma_desc *dma_desc;
260 unsigned long flags;
261
262 spin_lock_irqsave(&tdc->lock, flags);
263
264 /* Do not allocate if desc are waiting for ack */
265 list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
266 if (async_tx_test_ack(&dma_desc->txd)) {
267 list_del(&dma_desc->node);
268 spin_unlock_irqrestore(&tdc->lock, flags);
269 return dma_desc;
270 }
271 }
272
273 spin_unlock_irqrestore(&tdc->lock, flags);
274
275 /* Allocate DMA desc */
276 dma_desc = kzalloc(sizeof(*dma_desc), GFP_ATOMIC);
277 if (!dma_desc) {
278 dev_err(tdc2dev(tdc), "dma_desc alloc failed\n");
279 return NULL;
280 }
281
282 dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan);
283 dma_desc->txd.tx_submit = tegra_dma_tx_submit;
284 dma_desc->txd.flags = 0;
285 return dma_desc;
286}
287
288static void tegra_dma_desc_put(struct tegra_dma_channel *tdc,
289 struct tegra_dma_desc *dma_desc)
290{
291 unsigned long flags;
292
293 spin_lock_irqsave(&tdc->lock, flags);
294 if (!list_empty(&dma_desc->tx_list))
295 list_splice_init(&dma_desc->tx_list, &tdc->free_sg_req);
296 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
297 spin_unlock_irqrestore(&tdc->lock, flags);
298}
299
300static struct tegra_dma_sg_req *tegra_dma_sg_req_get(
301 struct tegra_dma_channel *tdc)
302{
303 struct tegra_dma_sg_req *sg_req = NULL;
304 unsigned long flags;
305
306 spin_lock_irqsave(&tdc->lock, flags);
307 if (!list_empty(&tdc->free_sg_req)) {
308 sg_req = list_first_entry(&tdc->free_sg_req,
309 typeof(*sg_req), node);
310 list_del(&sg_req->node);
311 spin_unlock_irqrestore(&tdc->lock, flags);
312 return sg_req;
313 }
314 spin_unlock_irqrestore(&tdc->lock, flags);
315
316 sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_ATOMIC);
317 if (!sg_req)
318 dev_err(tdc2dev(tdc), "sg_req alloc failed\n");
319 return sg_req;
320}
321
322static int tegra_dma_slave_config(struct dma_chan *dc,
323 struct dma_slave_config *sconfig)
324{
325 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
326
327 if (!list_empty(&tdc->pending_sg_req)) {
328 dev_err(tdc2dev(tdc), "Configuration not allowed\n");
329 return -EBUSY;
330 }
331
332 memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
333 tdc->config_init = true;
334 return 0;
335}
336
337static void tegra_dma_global_pause(struct tegra_dma_channel *tdc,
338 bool wait_for_burst_complete)
339{
340 struct tegra_dma *tdma = tdc->tdma;
341
342 spin_lock(&tdma->global_lock);
343 tdma_write(tdma, TEGRA_APBDMA_GENERAL, 0);
344 if (wait_for_burst_complete)
345 udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
346}
347
348static void tegra_dma_global_resume(struct tegra_dma_channel *tdc)
349{
350 struct tegra_dma *tdma = tdc->tdma;
351
352 tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
353 spin_unlock(&tdma->global_lock);
354}
355
356static void tegra_dma_stop(struct tegra_dma_channel *tdc)
357{
358 u32 csr;
359 u32 status;
360
361 /* Disable interrupts */
362 csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
363 csr &= ~TEGRA_APBDMA_CSR_IE_EOC;
364 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
365
366 /* Disable DMA */
367 csr &= ~TEGRA_APBDMA_CSR_ENB;
368 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
369
370 /* Clear interrupt status if it is there */
371 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
372 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
373 dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
374 tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
375 }
376 tdc->busy = false;
377}
378
379static void tegra_dma_start(struct tegra_dma_channel *tdc,
380 struct tegra_dma_sg_req *sg_req)
381{
382 struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
383
384 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, ch_regs->csr);
385 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_regs->apb_seq);
386 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_regs->apb_ptr);
387 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_regs->ahb_seq);
388 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_regs->ahb_ptr);
389
390 /* Start DMA */
391 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
392 ch_regs->csr | TEGRA_APBDMA_CSR_ENB);
393}
394
395static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
396 struct tegra_dma_sg_req *nsg_req)
397{
398 unsigned long status;
399
400 /*
401 * The DMA controller reloads the new configuration for next transfer
402 * after last burst of current transfer completes.
403 * If there is no IEC status then this makes sure that last burst
404 * has not be completed. There may be case that last burst is on
405 * flight and so it can complete but because DMA is paused, it
406 * will not generates interrupt as well as not reload the new
407 * configuration.
408 * If there is already IEC status then interrupt handler need to
409 * load new configuration.
410 */
411 tegra_dma_global_pause(tdc, false);
412 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
413
414 /*
415 * If interrupt is pending then do nothing as the ISR will handle
416 * the programing for new request.
417 */
418 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
419 dev_err(tdc2dev(tdc),
420 "Skipping new configuration as interrupt is pending\n");
421 tegra_dma_global_resume(tdc);
422 return;
423 }
424
425 /* Safe to program new configuration */
426 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->ch_regs.apb_ptr);
427 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr);
428 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
429 nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
430 nsg_req->configured = true;
431
432 tegra_dma_global_resume(tdc);
433}
434
435static void tdc_start_head_req(struct tegra_dma_channel *tdc)
436{
437 struct tegra_dma_sg_req *sg_req;
438
439 if (list_empty(&tdc->pending_sg_req))
440 return;
441
442 sg_req = list_first_entry(&tdc->pending_sg_req,
443 typeof(*sg_req), node);
444 tegra_dma_start(tdc, sg_req);
445 sg_req->configured = true;
446 tdc->busy = true;
447}
448
449static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc)
450{
451 struct tegra_dma_sg_req *hsgreq;
452 struct tegra_dma_sg_req *hnsgreq;
453
454 if (list_empty(&tdc->pending_sg_req))
455 return;
456
457 hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
458 if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) {
459 hnsgreq = list_first_entry(&hsgreq->node,
460 typeof(*hnsgreq), node);
461 tegra_dma_configure_for_next(tdc, hnsgreq);
462 }
463}
464
465static inline int get_current_xferred_count(struct tegra_dma_channel *tdc,
466 struct tegra_dma_sg_req *sg_req, unsigned long status)
467{
468 return sg_req->req_len - (status & TEGRA_APBDMA_STATUS_COUNT_MASK) - 4;
469}
470
471static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
472{
473 struct tegra_dma_sg_req *sgreq;
474 struct tegra_dma_desc *dma_desc;
475
476 while (!list_empty(&tdc->pending_sg_req)) {
477 sgreq = list_first_entry(&tdc->pending_sg_req,
478 typeof(*sgreq), node);
Wei Yongjun2cc44e62012-09-05 15:08:56 +0800479 list_move_tail(&sgreq->node, &tdc->free_sg_req);
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530480 if (sgreq->last_sg) {
481 dma_desc = sgreq->dma_desc;
482 dma_desc->dma_status = DMA_ERROR;
483 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
484
485 /* Add in cb list if it is not there. */
486 if (!dma_desc->cb_count)
487 list_add_tail(&dma_desc->cb_node,
488 &tdc->cb_desc);
489 dma_desc->cb_count++;
490 }
491 }
492 tdc->isr_handler = NULL;
493}
494
495static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
496 struct tegra_dma_sg_req *last_sg_req, bool to_terminate)
497{
498 struct tegra_dma_sg_req *hsgreq = NULL;
499
500 if (list_empty(&tdc->pending_sg_req)) {
501 dev_err(tdc2dev(tdc), "Dma is running without req\n");
502 tegra_dma_stop(tdc);
503 return false;
504 }
505
506 /*
507 * Check that head req on list should be in flight.
508 * If it is not in flight then abort transfer as
509 * looping of transfer can not continue.
510 */
511 hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
512 if (!hsgreq->configured) {
513 tegra_dma_stop(tdc);
514 dev_err(tdc2dev(tdc), "Error in dma transfer, aborting dma\n");
515 tegra_dma_abort_all(tdc);
516 return false;
517 }
518
519 /* Configure next request */
520 if (!to_terminate)
521 tdc_configure_next_head_desc(tdc);
522 return true;
523}
524
525static void handle_once_dma_done(struct tegra_dma_channel *tdc,
526 bool to_terminate)
527{
528 struct tegra_dma_sg_req *sgreq;
529 struct tegra_dma_desc *dma_desc;
530
531 tdc->busy = false;
532 sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
533 dma_desc = sgreq->dma_desc;
534 dma_desc->bytes_transferred += sgreq->req_len;
535
536 list_del(&sgreq->node);
537 if (sgreq->last_sg) {
538 dma_desc->dma_status = DMA_SUCCESS;
539 dma_cookie_complete(&dma_desc->txd);
540 if (!dma_desc->cb_count)
541 list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
542 dma_desc->cb_count++;
543 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
544 }
545 list_add_tail(&sgreq->node, &tdc->free_sg_req);
546
547 /* Do not start DMA if it is going to be terminate */
548 if (to_terminate || list_empty(&tdc->pending_sg_req))
549 return;
550
551 tdc_start_head_req(tdc);
552 return;
553}
554
555static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc,
556 bool to_terminate)
557{
558 struct tegra_dma_sg_req *sgreq;
559 struct tegra_dma_desc *dma_desc;
560 bool st;
561
562 sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
563 dma_desc = sgreq->dma_desc;
564 dma_desc->bytes_transferred += sgreq->req_len;
565
566 /* Callback need to be call */
567 if (!dma_desc->cb_count)
568 list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
569 dma_desc->cb_count++;
570
571 /* If not last req then put at end of pending list */
572 if (!list_is_last(&sgreq->node, &tdc->pending_sg_req)) {
Wei Yongjun2cc44e62012-09-05 15:08:56 +0800573 list_move_tail(&sgreq->node, &tdc->pending_sg_req);
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530574 sgreq->configured = false;
575 st = handle_continuous_head_request(tdc, sgreq, to_terminate);
576 if (!st)
577 dma_desc->dma_status = DMA_ERROR;
578 }
579 return;
580}
581
582static void tegra_dma_tasklet(unsigned long data)
583{
584 struct tegra_dma_channel *tdc = (struct tegra_dma_channel *)data;
585 dma_async_tx_callback callback = NULL;
586 void *callback_param = NULL;
587 struct tegra_dma_desc *dma_desc;
588 unsigned long flags;
589 int cb_count;
590
591 spin_lock_irqsave(&tdc->lock, flags);
592 while (!list_empty(&tdc->cb_desc)) {
593 dma_desc = list_first_entry(&tdc->cb_desc,
594 typeof(*dma_desc), cb_node);
595 list_del(&dma_desc->cb_node);
596 callback = dma_desc->txd.callback;
597 callback_param = dma_desc->txd.callback_param;
598 cb_count = dma_desc->cb_count;
599 dma_desc->cb_count = 0;
600 spin_unlock_irqrestore(&tdc->lock, flags);
601 while (cb_count-- && callback)
602 callback(callback_param);
603 spin_lock_irqsave(&tdc->lock, flags);
604 }
605 spin_unlock_irqrestore(&tdc->lock, flags);
606}
607
608static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
609{
610 struct tegra_dma_channel *tdc = dev_id;
611 unsigned long status;
612 unsigned long flags;
613
614 spin_lock_irqsave(&tdc->lock, flags);
615
616 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
617 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
618 tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
619 tdc->isr_handler(tdc, false);
620 tasklet_schedule(&tdc->tasklet);
621 spin_unlock_irqrestore(&tdc->lock, flags);
622 return IRQ_HANDLED;
623 }
624
625 spin_unlock_irqrestore(&tdc->lock, flags);
626 dev_info(tdc2dev(tdc),
627 "Interrupt already served status 0x%08lx\n", status);
628 return IRQ_NONE;
629}
630
631static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd)
632{
633 struct tegra_dma_desc *dma_desc = txd_to_tegra_dma_desc(txd);
634 struct tegra_dma_channel *tdc = to_tegra_dma_chan(txd->chan);
635 unsigned long flags;
636 dma_cookie_t cookie;
637
638 spin_lock_irqsave(&tdc->lock, flags);
639 dma_desc->dma_status = DMA_IN_PROGRESS;
640 cookie = dma_cookie_assign(&dma_desc->txd);
641 list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req);
642 spin_unlock_irqrestore(&tdc->lock, flags);
643 return cookie;
644}
645
646static void tegra_dma_issue_pending(struct dma_chan *dc)
647{
648 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
649 unsigned long flags;
650
651 spin_lock_irqsave(&tdc->lock, flags);
652 if (list_empty(&tdc->pending_sg_req)) {
653 dev_err(tdc2dev(tdc), "No DMA request\n");
654 goto end;
655 }
656 if (!tdc->busy) {
657 tdc_start_head_req(tdc);
658
659 /* Continuous single mode: Configure next req */
660 if (tdc->cyclic) {
661 /*
662 * Wait for 1 burst time for configure DMA for
663 * next transfer.
664 */
665 udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
666 tdc_configure_next_head_desc(tdc);
667 }
668 }
669end:
670 spin_unlock_irqrestore(&tdc->lock, flags);
671 return;
672}
673
674static void tegra_dma_terminate_all(struct dma_chan *dc)
675{
676 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
677 struct tegra_dma_sg_req *sgreq;
678 struct tegra_dma_desc *dma_desc;
679 unsigned long flags;
680 unsigned long status;
681 bool was_busy;
682
683 spin_lock_irqsave(&tdc->lock, flags);
684 if (list_empty(&tdc->pending_sg_req)) {
685 spin_unlock_irqrestore(&tdc->lock, flags);
686 return;
687 }
688
689 if (!tdc->busy)
690 goto skip_dma_stop;
691
692 /* Pause DMA before checking the queue status */
693 tegra_dma_global_pause(tdc, true);
694
695 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
696 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
697 dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__);
698 tdc->isr_handler(tdc, true);
699 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
700 }
701
702 was_busy = tdc->busy;
703 tegra_dma_stop(tdc);
704
705 if (!list_empty(&tdc->pending_sg_req) && was_busy) {
706 sgreq = list_first_entry(&tdc->pending_sg_req,
707 typeof(*sgreq), node);
708 sgreq->dma_desc->bytes_transferred +=
709 get_current_xferred_count(tdc, sgreq, status);
710 }
711 tegra_dma_global_resume(tdc);
712
713skip_dma_stop:
714 tegra_dma_abort_all(tdc);
715
716 while (!list_empty(&tdc->cb_desc)) {
717 dma_desc = list_first_entry(&tdc->cb_desc,
718 typeof(*dma_desc), cb_node);
719 list_del(&dma_desc->cb_node);
720 dma_desc->cb_count = 0;
721 }
722 spin_unlock_irqrestore(&tdc->lock, flags);
723}
724
725static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
726 dma_cookie_t cookie, struct dma_tx_state *txstate)
727{
728 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
729 struct tegra_dma_desc *dma_desc;
730 struct tegra_dma_sg_req *sg_req;
731 enum dma_status ret;
732 unsigned long flags;
Laxman Dewangan4a46ba32012-07-02 13:52:07 +0530733 unsigned int residual;
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530734
735 spin_lock_irqsave(&tdc->lock, flags);
736
737 ret = dma_cookie_status(dc, cookie, txstate);
738 if (ret == DMA_SUCCESS) {
739 dma_set_residue(txstate, 0);
740 spin_unlock_irqrestore(&tdc->lock, flags);
741 return ret;
742 }
743
744 /* Check on wait_ack desc status */
745 list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
746 if (dma_desc->txd.cookie == cookie) {
Laxman Dewangan4a46ba32012-07-02 13:52:07 +0530747 residual = dma_desc->bytes_requested -
748 (dma_desc->bytes_transferred %
749 dma_desc->bytes_requested);
750 dma_set_residue(txstate, residual);
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530751 ret = dma_desc->dma_status;
752 spin_unlock_irqrestore(&tdc->lock, flags);
753 return ret;
754 }
755 }
756
757 /* Check in pending list */
758 list_for_each_entry(sg_req, &tdc->pending_sg_req, node) {
759 dma_desc = sg_req->dma_desc;
760 if (dma_desc->txd.cookie == cookie) {
Laxman Dewangan4a46ba32012-07-02 13:52:07 +0530761 residual = dma_desc->bytes_requested -
762 (dma_desc->bytes_transferred %
763 dma_desc->bytes_requested);
764 dma_set_residue(txstate, residual);
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530765 ret = dma_desc->dma_status;
766 spin_unlock_irqrestore(&tdc->lock, flags);
767 return ret;
768 }
769 }
770
771 dev_dbg(tdc2dev(tdc), "cookie %d does not found\n", cookie);
772 spin_unlock_irqrestore(&tdc->lock, flags);
773 return ret;
774}
775
776static int tegra_dma_device_control(struct dma_chan *dc, enum dma_ctrl_cmd cmd,
777 unsigned long arg)
778{
779 switch (cmd) {
780 case DMA_SLAVE_CONFIG:
781 return tegra_dma_slave_config(dc,
782 (struct dma_slave_config *)arg);
783
784 case DMA_TERMINATE_ALL:
785 tegra_dma_terminate_all(dc);
786 return 0;
787
788 default:
789 break;
790 }
791
792 return -ENXIO;
793}
794
795static inline int get_bus_width(struct tegra_dma_channel *tdc,
796 enum dma_slave_buswidth slave_bw)
797{
798 switch (slave_bw) {
799 case DMA_SLAVE_BUSWIDTH_1_BYTE:
800 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8;
801 case DMA_SLAVE_BUSWIDTH_2_BYTES:
802 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16;
803 case DMA_SLAVE_BUSWIDTH_4_BYTES:
804 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
805 case DMA_SLAVE_BUSWIDTH_8_BYTES:
806 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64;
807 default:
808 dev_warn(tdc2dev(tdc),
809 "slave bw is not supported, using 32bits\n");
810 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
811 }
812}
813
814static inline int get_burst_size(struct tegra_dma_channel *tdc,
815 u32 burst_size, enum dma_slave_buswidth slave_bw, int len)
816{
817 int burst_byte;
818 int burst_ahb_width;
819
820 /*
821 * burst_size from client is in terms of the bus_width.
822 * convert them into AHB memory width which is 4 byte.
823 */
824 burst_byte = burst_size * slave_bw;
825 burst_ahb_width = burst_byte / 4;
826
827 /* If burst size is 0 then calculate the burst size based on length */
828 if (!burst_ahb_width) {
829 if (len & 0xF)
830 return TEGRA_APBDMA_AHBSEQ_BURST_1;
831 else if ((len >> 4) & 0x1)
832 return TEGRA_APBDMA_AHBSEQ_BURST_4;
833 else
834 return TEGRA_APBDMA_AHBSEQ_BURST_8;
835 }
836 if (burst_ahb_width < 4)
837 return TEGRA_APBDMA_AHBSEQ_BURST_1;
838 else if (burst_ahb_width < 8)
839 return TEGRA_APBDMA_AHBSEQ_BURST_4;
840 else
841 return TEGRA_APBDMA_AHBSEQ_BURST_8;
842}
843
844static int get_transfer_param(struct tegra_dma_channel *tdc,
845 enum dma_transfer_direction direction, unsigned long *apb_addr,
846 unsigned long *apb_seq, unsigned long *csr, unsigned int *burst_size,
847 enum dma_slave_buswidth *slave_bw)
848{
849
850 switch (direction) {
851 case DMA_MEM_TO_DEV:
852 *apb_addr = tdc->dma_sconfig.dst_addr;
853 *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
854 *burst_size = tdc->dma_sconfig.dst_maxburst;
855 *slave_bw = tdc->dma_sconfig.dst_addr_width;
856 *csr = TEGRA_APBDMA_CSR_DIR;
857 return 0;
858
859 case DMA_DEV_TO_MEM:
860 *apb_addr = tdc->dma_sconfig.src_addr;
861 *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
862 *burst_size = tdc->dma_sconfig.src_maxburst;
863 *slave_bw = tdc->dma_sconfig.src_addr_width;
864 *csr = 0;
865 return 0;
866
867 default:
868 dev_err(tdc2dev(tdc), "Dma direction is not supported\n");
869 return -EINVAL;
870 }
871 return -EINVAL;
872}
873
874static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
875 struct dma_chan *dc, struct scatterlist *sgl, unsigned int sg_len,
876 enum dma_transfer_direction direction, unsigned long flags,
877 void *context)
878{
879 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
880 struct tegra_dma_desc *dma_desc;
881 unsigned int i;
882 struct scatterlist *sg;
883 unsigned long csr, ahb_seq, apb_ptr, apb_seq;
884 struct list_head req_list;
885 struct tegra_dma_sg_req *sg_req = NULL;
886 u32 burst_size;
887 enum dma_slave_buswidth slave_bw;
888 int ret;
889
890 if (!tdc->config_init) {
891 dev_err(tdc2dev(tdc), "dma channel is not configured\n");
892 return NULL;
893 }
894 if (sg_len < 1) {
895 dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
896 return NULL;
897 }
898
899 ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
900 &burst_size, &slave_bw);
901 if (ret < 0)
902 return NULL;
903
904 INIT_LIST_HEAD(&req_list);
905
906 ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
907 ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
908 TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
909 ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
910
911 csr |= TEGRA_APBDMA_CSR_ONCE | TEGRA_APBDMA_CSR_FLOW;
912 csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
913 if (flags & DMA_PREP_INTERRUPT)
914 csr |= TEGRA_APBDMA_CSR_IE_EOC;
915
916 apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
917
918 dma_desc = tegra_dma_desc_get(tdc);
919 if (!dma_desc) {
920 dev_err(tdc2dev(tdc), "Dma descriptors not available\n");
921 return NULL;
922 }
923 INIT_LIST_HEAD(&dma_desc->tx_list);
924 INIT_LIST_HEAD(&dma_desc->cb_node);
925 dma_desc->cb_count = 0;
926 dma_desc->bytes_requested = 0;
927 dma_desc->bytes_transferred = 0;
928 dma_desc->dma_status = DMA_IN_PROGRESS;
929
930 /* Make transfer requests */
931 for_each_sg(sgl, sg, sg_len, i) {
932 u32 len, mem;
933
Laxman Dewangan597c8542012-06-22 20:41:10 +0530934 mem = sg_dma_address(sg);
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530935 len = sg_dma_len(sg);
936
937 if ((len & 3) || (mem & 3) ||
938 (len > tdc->tdma->chip_data->max_dma_count)) {
939 dev_err(tdc2dev(tdc),
940 "Dma length/memory address is not supported\n");
941 tegra_dma_desc_put(tdc, dma_desc);
942 return NULL;
943 }
944
945 sg_req = tegra_dma_sg_req_get(tdc);
946 if (!sg_req) {
947 dev_err(tdc2dev(tdc), "Dma sg-req not available\n");
948 tegra_dma_desc_put(tdc, dma_desc);
949 return NULL;
950 }
951
952 ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
953 dma_desc->bytes_requested += len;
954
955 sg_req->ch_regs.apb_ptr = apb_ptr;
956 sg_req->ch_regs.ahb_ptr = mem;
957 sg_req->ch_regs.csr = csr | ((len - 4) & 0xFFFC);
958 sg_req->ch_regs.apb_seq = apb_seq;
959 sg_req->ch_regs.ahb_seq = ahb_seq;
960 sg_req->configured = false;
961 sg_req->last_sg = false;
962 sg_req->dma_desc = dma_desc;
963 sg_req->req_len = len;
964
965 list_add_tail(&sg_req->node, &dma_desc->tx_list);
966 }
967 sg_req->last_sg = true;
968 if (flags & DMA_CTRL_ACK)
969 dma_desc->txd.flags = DMA_CTRL_ACK;
970
971 /*
972 * Make sure that mode should not be conflicting with currently
973 * configured mode.
974 */
975 if (!tdc->isr_handler) {
976 tdc->isr_handler = handle_once_dma_done;
977 tdc->cyclic = false;
978 } else {
979 if (tdc->cyclic) {
980 dev_err(tdc2dev(tdc), "DMA configured in cyclic mode\n");
981 tegra_dma_desc_put(tdc, dma_desc);
982 return NULL;
983 }
984 }
985
986 return &dma_desc->txd;
987}
988
989struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
990 struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
991 size_t period_len, enum dma_transfer_direction direction,
Peter Ujfalusiec8b5e42012-09-14 15:05:47 +0300992 unsigned long flags, void *context)
Laxman Dewanganec8a1582012-06-06 10:55:27 +0530993{
994 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
995 struct tegra_dma_desc *dma_desc = NULL;
996 struct tegra_dma_sg_req *sg_req = NULL;
997 unsigned long csr, ahb_seq, apb_ptr, apb_seq;
998 int len;
999 size_t remain_len;
1000 dma_addr_t mem = buf_addr;
1001 u32 burst_size;
1002 enum dma_slave_buswidth slave_bw;
1003 int ret;
1004
1005 if (!buf_len || !period_len) {
1006 dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
1007 return NULL;
1008 }
1009
1010 if (!tdc->config_init) {
1011 dev_err(tdc2dev(tdc), "DMA slave is not configured\n");
1012 return NULL;
1013 }
1014
1015 /*
1016 * We allow to take more number of requests till DMA is
1017 * not started. The driver will loop over all requests.
1018 * Once DMA is started then new requests can be queued only after
1019 * terminating the DMA.
1020 */
1021 if (tdc->busy) {
1022 dev_err(tdc2dev(tdc), "Request not allowed when dma running\n");
1023 return NULL;
1024 }
1025
1026 /*
1027 * We only support cycle transfer when buf_len is multiple of
1028 * period_len.
1029 */
1030 if (buf_len % period_len) {
1031 dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n");
1032 return NULL;
1033 }
1034
1035 len = period_len;
1036 if ((len & 3) || (buf_addr & 3) ||
1037 (len > tdc->tdma->chip_data->max_dma_count)) {
1038 dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n");
1039 return NULL;
1040 }
1041
1042 ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
1043 &burst_size, &slave_bw);
1044 if (ret < 0)
1045 return NULL;
1046
1047
1048 ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
1049 ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
1050 TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
1051 ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
1052
1053 csr |= TEGRA_APBDMA_CSR_FLOW | TEGRA_APBDMA_CSR_IE_EOC;
1054 csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
1055
1056 apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
1057
1058 dma_desc = tegra_dma_desc_get(tdc);
1059 if (!dma_desc) {
1060 dev_err(tdc2dev(tdc), "not enough descriptors available\n");
1061 return NULL;
1062 }
1063
1064 INIT_LIST_HEAD(&dma_desc->tx_list);
1065 INIT_LIST_HEAD(&dma_desc->cb_node);
1066 dma_desc->cb_count = 0;
1067
1068 dma_desc->bytes_transferred = 0;
1069 dma_desc->bytes_requested = buf_len;
1070 remain_len = buf_len;
1071
1072 /* Split transfer equal to period size */
1073 while (remain_len) {
1074 sg_req = tegra_dma_sg_req_get(tdc);
1075 if (!sg_req) {
1076 dev_err(tdc2dev(tdc), "Dma sg-req not available\n");
1077 tegra_dma_desc_put(tdc, dma_desc);
1078 return NULL;
1079 }
1080
1081 ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
1082 sg_req->ch_regs.apb_ptr = apb_ptr;
1083 sg_req->ch_regs.ahb_ptr = mem;
1084 sg_req->ch_regs.csr = csr | ((len - 4) & 0xFFFC);
1085 sg_req->ch_regs.apb_seq = apb_seq;
1086 sg_req->ch_regs.ahb_seq = ahb_seq;
1087 sg_req->configured = false;
1088 sg_req->half_done = false;
1089 sg_req->last_sg = false;
1090 sg_req->dma_desc = dma_desc;
1091 sg_req->req_len = len;
1092
1093 list_add_tail(&sg_req->node, &dma_desc->tx_list);
1094 remain_len -= len;
1095 mem += len;
1096 }
1097 sg_req->last_sg = true;
Laxman Dewangan6660f7a2012-06-22 17:12:44 +05301098 dma_desc->txd.flags = 0;
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301099
1100 /*
1101 * Make sure that mode should not be conflicting with currently
1102 * configured mode.
1103 */
1104 if (!tdc->isr_handler) {
1105 tdc->isr_handler = handle_cont_sngl_cycle_dma_done;
1106 tdc->cyclic = true;
1107 } else {
1108 if (!tdc->cyclic) {
1109 dev_err(tdc2dev(tdc), "DMA configuration conflict\n");
1110 tegra_dma_desc_put(tdc, dma_desc);
1111 return NULL;
1112 }
1113 }
1114
1115 return &dma_desc->txd;
1116}
1117
1118static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
1119{
1120 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
Laxman Dewanganffc49302012-07-20 13:31:08 +05301121 struct tegra_dma *tdma = tdc->tdma;
1122 int ret;
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301123
1124 dma_cookie_init(&tdc->dma_chan);
1125 tdc->config_init = false;
Laxman Dewanganffc49302012-07-20 13:31:08 +05301126 ret = clk_prepare_enable(tdma->dma_clk);
1127 if (ret < 0)
1128 dev_err(tdc2dev(tdc), "clk_prepare_enable failed: %d\n", ret);
1129 return ret;
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301130}
1131
1132static void tegra_dma_free_chan_resources(struct dma_chan *dc)
1133{
1134 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
Laxman Dewanganffc49302012-07-20 13:31:08 +05301135 struct tegra_dma *tdma = tdc->tdma;
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301136
1137 struct tegra_dma_desc *dma_desc;
1138 struct tegra_dma_sg_req *sg_req;
1139 struct list_head dma_desc_list;
1140 struct list_head sg_req_list;
1141 unsigned long flags;
1142
1143 INIT_LIST_HEAD(&dma_desc_list);
1144 INIT_LIST_HEAD(&sg_req_list);
1145
1146 dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
1147
1148 if (tdc->busy)
1149 tegra_dma_terminate_all(dc);
1150
1151 spin_lock_irqsave(&tdc->lock, flags);
1152 list_splice_init(&tdc->pending_sg_req, &sg_req_list);
1153 list_splice_init(&tdc->free_sg_req, &sg_req_list);
1154 list_splice_init(&tdc->free_dma_desc, &dma_desc_list);
1155 INIT_LIST_HEAD(&tdc->cb_desc);
1156 tdc->config_init = false;
1157 spin_unlock_irqrestore(&tdc->lock, flags);
1158
1159 while (!list_empty(&dma_desc_list)) {
1160 dma_desc = list_first_entry(&dma_desc_list,
1161 typeof(*dma_desc), node);
1162 list_del(&dma_desc->node);
1163 kfree(dma_desc);
1164 }
1165
1166 while (!list_empty(&sg_req_list)) {
1167 sg_req = list_first_entry(&sg_req_list, typeof(*sg_req), node);
1168 list_del(&sg_req->node);
1169 kfree(sg_req);
1170 }
Laxman Dewanganffc49302012-07-20 13:31:08 +05301171 clk_disable_unprepare(tdma->dma_clk);
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301172}
1173
1174/* Tegra20 specific DMA controller information */
Laxman Dewangan75f21632012-08-29 10:31:18 +02001175static const struct tegra_dma_chip_data tegra20_dma_chip_data = {
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301176 .nr_channels = 16,
1177 .max_dma_count = 1024UL * 64,
1178};
1179
1180#if defined(CONFIG_OF)
1181/* Tegra30 specific DMA controller information */
Laxman Dewangan75f21632012-08-29 10:31:18 +02001182static const struct tegra_dma_chip_data tegra30_dma_chip_data = {
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301183 .nr_channels = 32,
1184 .max_dma_count = 1024UL * 64,
1185};
1186
1187static const struct of_device_id tegra_dma_of_match[] __devinitconst = {
1188 {
Laxman Dewangancd9092c2012-07-02 13:52:08 +05301189 .compatible = "nvidia,tegra30-apbdma",
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301190 .data = &tegra30_dma_chip_data,
1191 }, {
Laxman Dewangancd9092c2012-07-02 13:52:08 +05301192 .compatible = "nvidia,tegra20-apbdma",
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301193 .data = &tegra20_dma_chip_data,
1194 }, {
1195 },
1196};
1197MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
1198#endif
1199
1200static int __devinit tegra_dma_probe(struct platform_device *pdev)
1201{
1202 struct resource *res;
1203 struct tegra_dma *tdma;
1204 int ret;
1205 int i;
Laxman Dewangan83a1ef22012-08-29 10:23:07 +02001206 const struct tegra_dma_chip_data *cdata = NULL;
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301207
1208 if (pdev->dev.of_node) {
1209 const struct of_device_id *match;
1210 match = of_match_device(of_match_ptr(tegra_dma_of_match),
1211 &pdev->dev);
1212 if (!match) {
1213 dev_err(&pdev->dev, "Error: No device match found\n");
1214 return -ENODEV;
1215 }
1216 cdata = match->data;
1217 } else {
1218 /* If no device tree then fallback to tegra20 */
1219 cdata = &tegra20_dma_chip_data;
1220 }
1221
1222 tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
1223 sizeof(struct tegra_dma_channel), GFP_KERNEL);
1224 if (!tdma) {
1225 dev_err(&pdev->dev, "Error: memory allocation failed\n");
1226 return -ENOMEM;
1227 }
1228
1229 tdma->dev = &pdev->dev;
1230 tdma->chip_data = cdata;
1231 platform_set_drvdata(pdev, tdma);
1232
1233 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1234 if (!res) {
1235 dev_err(&pdev->dev, "No mem resource for DMA\n");
1236 return -EINVAL;
1237 }
1238
1239 tdma->base_addr = devm_request_and_ioremap(&pdev->dev, res);
1240 if (!tdma->base_addr) {
1241 dev_err(&pdev->dev,
1242 "Cannot request memregion/iomap dma address\n");
1243 return -EADDRNOTAVAIL;
1244 }
1245
1246 tdma->dma_clk = devm_clk_get(&pdev->dev, NULL);
1247 if (IS_ERR(tdma->dma_clk)) {
1248 dev_err(&pdev->dev, "Error: Missing controller clock\n");
1249 return PTR_ERR(tdma->dma_clk);
1250 }
1251
1252 spin_lock_init(&tdma->global_lock);
1253
1254 pm_runtime_enable(&pdev->dev);
1255 if (!pm_runtime_enabled(&pdev->dev)) {
1256 ret = tegra_dma_runtime_resume(&pdev->dev);
1257 if (ret) {
1258 dev_err(&pdev->dev, "dma_runtime_resume failed %d\n",
1259 ret);
1260 goto err_pm_disable;
1261 }
1262 }
1263
Laxman Dewanganffc49302012-07-20 13:31:08 +05301264 /* Enable clock before accessing registers */
1265 ret = clk_prepare_enable(tdma->dma_clk);
1266 if (ret < 0) {
1267 dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);
1268 goto err_pm_disable;
1269 }
1270
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301271 /* Reset DMA controller */
1272 tegra_periph_reset_assert(tdma->dma_clk);
1273 udelay(2);
1274 tegra_periph_reset_deassert(tdma->dma_clk);
1275
1276 /* Enable global DMA registers */
1277 tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
1278 tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);
1279 tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul);
1280
Laxman Dewanganffc49302012-07-20 13:31:08 +05301281 clk_disable_unprepare(tdma->dma_clk);
1282
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301283 INIT_LIST_HEAD(&tdma->dma_dev.channels);
1284 for (i = 0; i < cdata->nr_channels; i++) {
1285 struct tegra_dma_channel *tdc = &tdma->channels[i];
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301286
1287 tdc->chan_base_offset = TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET +
1288 i * TEGRA_APBDMA_CHANNEL_REGISTER_SIZE;
1289
1290 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
1291 if (!res) {
1292 ret = -EINVAL;
1293 dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
1294 goto err_irq;
1295 }
1296 tdc->irq = res->start;
Laxman Dewangand0fc9052012-10-03 22:48:07 +05301297 snprintf(tdc->name, sizeof(tdc->name), "apbdma.%d", i);
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301298 ret = devm_request_irq(&pdev->dev, tdc->irq,
Laxman Dewangand0fc9052012-10-03 22:48:07 +05301299 tegra_dma_isr, 0, tdc->name, tdc);
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301300 if (ret) {
1301 dev_err(&pdev->dev,
1302 "request_irq failed with err %d channel %d\n",
1303 i, ret);
1304 goto err_irq;
1305 }
1306
1307 tdc->dma_chan.device = &tdma->dma_dev;
1308 dma_cookie_init(&tdc->dma_chan);
1309 list_add_tail(&tdc->dma_chan.device_node,
1310 &tdma->dma_dev.channels);
1311 tdc->tdma = tdma;
1312 tdc->id = i;
1313
1314 tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
1315 (unsigned long)tdc);
1316 spin_lock_init(&tdc->lock);
1317
1318 INIT_LIST_HEAD(&tdc->pending_sg_req);
1319 INIT_LIST_HEAD(&tdc->free_sg_req);
1320 INIT_LIST_HEAD(&tdc->free_dma_desc);
1321 INIT_LIST_HEAD(&tdc->cb_desc);
1322 }
1323
1324 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
1325 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
Laxman Dewangan46fb3f82012-06-22 17:12:43 +05301326 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
1327
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301328 tdma->dma_dev.dev = &pdev->dev;
1329 tdma->dma_dev.device_alloc_chan_resources =
1330 tegra_dma_alloc_chan_resources;
1331 tdma->dma_dev.device_free_chan_resources =
1332 tegra_dma_free_chan_resources;
1333 tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
1334 tdma->dma_dev.device_prep_dma_cyclic = tegra_dma_prep_dma_cyclic;
1335 tdma->dma_dev.device_control = tegra_dma_device_control;
1336 tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
1337 tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
1338
1339 ret = dma_async_device_register(&tdma->dma_dev);
1340 if (ret < 0) {
1341 dev_err(&pdev->dev,
1342 "Tegra20 APB DMA driver registration failed %d\n", ret);
1343 goto err_irq;
1344 }
1345
1346 dev_info(&pdev->dev, "Tegra20 APB DMA driver register %d channels\n",
1347 cdata->nr_channels);
1348 return 0;
1349
1350err_irq:
1351 while (--i >= 0) {
1352 struct tegra_dma_channel *tdc = &tdma->channels[i];
1353 tasklet_kill(&tdc->tasklet);
1354 }
1355
1356err_pm_disable:
1357 pm_runtime_disable(&pdev->dev);
1358 if (!pm_runtime_status_suspended(&pdev->dev))
1359 tegra_dma_runtime_suspend(&pdev->dev);
1360 return ret;
1361}
1362
1363static int __devexit tegra_dma_remove(struct platform_device *pdev)
1364{
1365 struct tegra_dma *tdma = platform_get_drvdata(pdev);
1366 int i;
1367 struct tegra_dma_channel *tdc;
1368
1369 dma_async_device_unregister(&tdma->dma_dev);
1370
1371 for (i = 0; i < tdma->chip_data->nr_channels; ++i) {
1372 tdc = &tdma->channels[i];
1373 tasklet_kill(&tdc->tasklet);
1374 }
1375
1376 pm_runtime_disable(&pdev->dev);
1377 if (!pm_runtime_status_suspended(&pdev->dev))
1378 tegra_dma_runtime_suspend(&pdev->dev);
1379
1380 return 0;
1381}
1382
1383static int tegra_dma_runtime_suspend(struct device *dev)
1384{
1385 struct platform_device *pdev = to_platform_device(dev);
1386 struct tegra_dma *tdma = platform_get_drvdata(pdev);
1387
Prashant Gaikwad56482ec2012-06-25 12:01:31 +05301388 clk_disable_unprepare(tdma->dma_clk);
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301389 return 0;
1390}
1391
1392static int tegra_dma_runtime_resume(struct device *dev)
1393{
1394 struct platform_device *pdev = to_platform_device(dev);
1395 struct tegra_dma *tdma = platform_get_drvdata(pdev);
1396 int ret;
1397
Prashant Gaikwad56482ec2012-06-25 12:01:31 +05301398 ret = clk_prepare_enable(tdma->dma_clk);
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301399 if (ret < 0) {
1400 dev_err(dev, "clk_enable failed: %d\n", ret);
1401 return ret;
1402 }
1403 return 0;
1404}
1405
1406static const struct dev_pm_ops tegra_dma_dev_pm_ops __devinitconst = {
1407#ifdef CONFIG_PM_RUNTIME
1408 .runtime_suspend = tegra_dma_runtime_suspend,
1409 .runtime_resume = tegra_dma_runtime_resume,
1410#endif
1411};
1412
1413static struct platform_driver tegra_dmac_driver = {
1414 .driver = {
Laxman Dewangancd9092c2012-07-02 13:52:08 +05301415 .name = "tegra-apbdma",
Laxman Dewanganec8a1582012-06-06 10:55:27 +05301416 .owner = THIS_MODULE,
1417 .pm = &tegra_dma_dev_pm_ops,
1418 .of_match_table = of_match_ptr(tegra_dma_of_match),
1419 },
1420 .probe = tegra_dma_probe,
1421 .remove = __devexit_p(tegra_dma_remove),
1422};
1423
1424module_platform_driver(tegra_dmac_driver);
1425
1426MODULE_ALIAS("platform:tegra20-apbdma");
1427MODULE_DESCRIPTION("NVIDIA Tegra APB DMA Controller driver");
1428MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
1429MODULE_LICENSE("GPL v2");