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Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / dma / tegra20-apb-dma.c
1 /*
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/err.h>
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>
32 #include <linux/platform_device.h>
33 #include <linux/pm_runtime.h>
34 #include <linux/slab.h>
35 #include <linux/clk/tegra.h>
36
37 #include "dmaengine.h"
38
39 #define TEGRA_APBDMA_GENERAL 0x0
40 #define TEGRA_APBDMA_GENERAL_ENABLE BIT(31)
41
42 #define TEGRA_APBDMA_CONTROL 0x010
43 #define TEGRA_APBDMA_IRQ_MASK 0x01c
44 #define TEGRA_APBDMA_IRQ_MASK_SET 0x020
45
46 /* CSR register */
47 #define TEGRA_APBDMA_CHAN_CSR 0x00
48 #define TEGRA_APBDMA_CSR_ENB BIT(31)
49 #define TEGRA_APBDMA_CSR_IE_EOC BIT(30)
50 #define TEGRA_APBDMA_CSR_HOLD BIT(29)
51 #define TEGRA_APBDMA_CSR_DIR BIT(28)
52 #define TEGRA_APBDMA_CSR_ONCE BIT(27)
53 #define TEGRA_APBDMA_CSR_FLOW BIT(21)
54 #define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16
55 #define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC
56
57 /* STATUS register */
58 #define TEGRA_APBDMA_CHAN_STATUS 0x004
59 #define TEGRA_APBDMA_STATUS_BUSY BIT(31)
60 #define TEGRA_APBDMA_STATUS_ISE_EOC BIT(30)
61 #define TEGRA_APBDMA_STATUS_HALT BIT(29)
62 #define TEGRA_APBDMA_STATUS_PING_PONG BIT(28)
63 #define TEGRA_APBDMA_STATUS_COUNT_SHIFT 2
64 #define TEGRA_APBDMA_STATUS_COUNT_MASK 0xFFFC
65
66 #define TEGRA_APBDMA_CHAN_CSRE 0x00C
67 #define TEGRA_APBDMA_CHAN_CSRE_PAUSE (1 << 31)
68
69 /* AHB memory address */
70 #define TEGRA_APBDMA_CHAN_AHBPTR 0x010
71
72 /* AHB sequence register */
73 #define TEGRA_APBDMA_CHAN_AHBSEQ 0x14
74 #define TEGRA_APBDMA_AHBSEQ_INTR_ENB BIT(31)
75 #define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_8 (0 << 28)
76 #define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_16 (1 << 28)
77 #define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32 (2 << 28)
78 #define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_64 (3 << 28)
79 #define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_128 (4 << 28)
80 #define TEGRA_APBDMA_AHBSEQ_DATA_SWAP BIT(27)
81 #define TEGRA_APBDMA_AHBSEQ_BURST_1 (4 << 24)
82 #define TEGRA_APBDMA_AHBSEQ_BURST_4 (5 << 24)
83 #define TEGRA_APBDMA_AHBSEQ_BURST_8 (6 << 24)
84 #define TEGRA_APBDMA_AHBSEQ_DBL_BUF BIT(19)
85 #define TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT 16
86 #define TEGRA_APBDMA_AHBSEQ_WRAP_NONE 0
87
88 /* APB address */
89 #define TEGRA_APBDMA_CHAN_APBPTR 0x018
90
91 /* APB sequence register */
92 #define TEGRA_APBDMA_CHAN_APBSEQ 0x01c
93 #define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8 (0 << 28)
94 #define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16 (1 << 28)
95 #define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32 (2 << 28)
96 #define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64 (3 << 28)
97 #define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_128 (4 << 28)
98 #define TEGRA_APBDMA_APBSEQ_DATA_SWAP BIT(27)
99 #define TEGRA_APBDMA_APBSEQ_WRAP_WORD_1 (1 << 16)
100
101 /*
102 * If any burst is in flight and DMA paused then this is the time to complete
103 * on-flight burst and update DMA status register.
104 */
105 #define TEGRA_APBDMA_BURST_COMPLETE_TIME 20
106
107 /* Channel base address offset from APBDMA base address */
108 #define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
109
110 /* DMA channel register space size */
111 #define TEGRA_APBDMA_CHANNEL_REGISTER_SIZE 0x20
112
113 struct tegra_dma;
114
115 /*
116 * tegra_dma_chip_data Tegra chip specific DMA data
117 * @nr_channels: Number of channels available in the controller.
118 * @max_dma_count: Maximum DMA transfer count supported by DMA controller.
119 * @support_channel_pause: Support channel wise pause of dma.
120 */
121 struct tegra_dma_chip_data {
122 int nr_channels;
123 int max_dma_count;
124 bool support_channel_pause;
125 };
126
127 /* DMA channel registers */
128 struct tegra_dma_channel_regs {
129 unsigned long csr;
130 unsigned long ahb_ptr;
131 unsigned long apb_ptr;
132 unsigned long ahb_seq;
133 unsigned long apb_seq;
134 };
135
136 /*
137 * tegra_dma_sg_req: Dma request details to configure hardware. This
138 * contains the details for one transfer to configure DMA hw.
139 * The client's request for data transfer can be broken into multiple
140 * sub-transfer as per requester details and hw support.
141 * This sub transfer get added in the list of transfer and point to Tegra
142 * DMA descriptor which manages the transfer details.
143 */
144 struct tegra_dma_sg_req {
145 struct tegra_dma_channel_regs ch_regs;
146 int req_len;
147 bool configured;
148 bool last_sg;
149 bool half_done;
150 struct list_head node;
151 struct tegra_dma_desc *dma_desc;
152 };
153
154 /*
155 * tegra_dma_desc: Tegra DMA descriptors which manages the client requests.
156 * This descriptor keep track of transfer status, callbacks and request
157 * counts etc.
158 */
159 struct tegra_dma_desc {
160 struct dma_async_tx_descriptor txd;
161 int bytes_requested;
162 int bytes_transferred;
163 enum dma_status dma_status;
164 struct list_head node;
165 struct list_head tx_list;
166 struct list_head cb_node;
167 int cb_count;
168 };
169
170 struct tegra_dma_channel;
171
172 typedef void (*dma_isr_handler)(struct tegra_dma_channel *tdc,
173 bool to_terminate);
174
175 /* tegra_dma_channel: Channel specific information */
176 struct tegra_dma_channel {
177 struct dma_chan dma_chan;
178 char name[30];
179 bool config_init;
180 int id;
181 int irq;
182 unsigned long chan_base_offset;
183 spinlock_t lock;
184 bool busy;
185 struct tegra_dma *tdma;
186 bool cyclic;
187
188 /* Different lists for managing the requests */
189 struct list_head free_sg_req;
190 struct list_head pending_sg_req;
191 struct list_head free_dma_desc;
192 struct list_head cb_desc;
193
194 /* ISR handler and tasklet for bottom half of isr handling */
195 dma_isr_handler isr_handler;
196 struct tasklet_struct tasklet;
197 dma_async_tx_callback callback;
198 void *callback_param;
199
200 /* Channel-slave specific configuration */
201 struct dma_slave_config dma_sconfig;
202 };
203
204 /* tegra_dma: Tegra DMA specific information */
205 struct tegra_dma {
206 struct dma_device dma_dev;
207 struct device *dev;
208 struct clk *dma_clk;
209 spinlock_t global_lock;
210 void __iomem *base_addr;
211 const struct tegra_dma_chip_data *chip_data;
212
213 /* Some register need to be cache before suspend */
214 u32 reg_gen;
215
216 /* Last member of the structure */
217 struct tegra_dma_channel channels[0];
218 };
219
220 static inline void tdma_write(struct tegra_dma *tdma, u32 reg, u32 val)
221 {
222 writel(val, tdma->base_addr + reg);
223 }
224
225 static inline u32 tdma_read(struct tegra_dma *tdma, u32 reg)
226 {
227 return readl(tdma->base_addr + reg);
228 }
229
230 static inline void tdc_write(struct tegra_dma_channel *tdc,
231 u32 reg, u32 val)
232 {
233 writel(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg);
234 }
235
236 static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg)
237 {
238 return readl(tdc->tdma->base_addr + tdc->chan_base_offset + reg);
239 }
240
241 static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc)
242 {
243 return container_of(dc, struct tegra_dma_channel, dma_chan);
244 }
245
246 static inline struct tegra_dma_desc *txd_to_tegra_dma_desc(
247 struct dma_async_tx_descriptor *td)
248 {
249 return container_of(td, struct tegra_dma_desc, txd);
250 }
251
252 static inline struct device *tdc2dev(struct tegra_dma_channel *tdc)
253 {
254 return &tdc->dma_chan.dev->device;
255 }
256
257 static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *tx);
258 static int tegra_dma_runtime_suspend(struct device *dev);
259 static int tegra_dma_runtime_resume(struct device *dev);
260
261 /* Get DMA desc from free list, if not there then allocate it. */
262 static struct tegra_dma_desc *tegra_dma_desc_get(
263 struct tegra_dma_channel *tdc)
264 {
265 struct tegra_dma_desc *dma_desc;
266 unsigned long flags;
267
268 spin_lock_irqsave(&tdc->lock, flags);
269
270 /* Do not allocate if desc are waiting for ack */
271 list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
272 if (async_tx_test_ack(&dma_desc->txd)) {
273 list_del(&dma_desc->node);
274 spin_unlock_irqrestore(&tdc->lock, flags);
275 dma_desc->txd.flags = 0;
276 return dma_desc;
277 }
278 }
279
280 spin_unlock_irqrestore(&tdc->lock, flags);
281
282 /* Allocate DMA desc */
283 dma_desc = kzalloc(sizeof(*dma_desc), GFP_ATOMIC);
284 if (!dma_desc) {
285 dev_err(tdc2dev(tdc), "dma_desc alloc failed\n");
286 return NULL;
287 }
288
289 dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan);
290 dma_desc->txd.tx_submit = tegra_dma_tx_submit;
291 dma_desc->txd.flags = 0;
292 return dma_desc;
293 }
294
295 static void tegra_dma_desc_put(struct tegra_dma_channel *tdc,
296 struct tegra_dma_desc *dma_desc)
297 {
298 unsigned long flags;
299
300 spin_lock_irqsave(&tdc->lock, flags);
301 if (!list_empty(&dma_desc->tx_list))
302 list_splice_init(&dma_desc->tx_list, &tdc->free_sg_req);
303 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
304 spin_unlock_irqrestore(&tdc->lock, flags);
305 }
306
307 static struct tegra_dma_sg_req *tegra_dma_sg_req_get(
308 struct tegra_dma_channel *tdc)
309 {
310 struct tegra_dma_sg_req *sg_req = NULL;
311 unsigned long flags;
312
313 spin_lock_irqsave(&tdc->lock, flags);
314 if (!list_empty(&tdc->free_sg_req)) {
315 sg_req = list_first_entry(&tdc->free_sg_req,
316 typeof(*sg_req), node);
317 list_del(&sg_req->node);
318 spin_unlock_irqrestore(&tdc->lock, flags);
319 return sg_req;
320 }
321 spin_unlock_irqrestore(&tdc->lock, flags);
322
323 sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_ATOMIC);
324 if (!sg_req)
325 dev_err(tdc2dev(tdc), "sg_req alloc failed\n");
326 return sg_req;
327 }
328
329 static int tegra_dma_slave_config(struct dma_chan *dc,
330 struct dma_slave_config *sconfig)
331 {
332 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
333
334 if (!list_empty(&tdc->pending_sg_req)) {
335 dev_err(tdc2dev(tdc), "Configuration not allowed\n");
336 return -EBUSY;
337 }
338
339 memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
340 tdc->config_init = true;
341 return 0;
342 }
343
344 static void tegra_dma_global_pause(struct tegra_dma_channel *tdc,
345 bool wait_for_burst_complete)
346 {
347 struct tegra_dma *tdma = tdc->tdma;
348
349 spin_lock(&tdma->global_lock);
350 tdma_write(tdma, TEGRA_APBDMA_GENERAL, 0);
351 if (wait_for_burst_complete)
352 udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
353 }
354
355 static void tegra_dma_global_resume(struct tegra_dma_channel *tdc)
356 {
357 struct tegra_dma *tdma = tdc->tdma;
358
359 tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
360 spin_unlock(&tdma->global_lock);
361 }
362
363 static void tegra_dma_pause(struct tegra_dma_channel *tdc,
364 bool wait_for_burst_complete)
365 {
366 struct tegra_dma *tdma = tdc->tdma;
367
368 if (tdma->chip_data->support_channel_pause) {
369 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE,
370 TEGRA_APBDMA_CHAN_CSRE_PAUSE);
371 if (wait_for_burst_complete)
372 udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
373 } else {
374 tegra_dma_global_pause(tdc, wait_for_burst_complete);
375 }
376 }
377
378 static void tegra_dma_resume(struct tegra_dma_channel *tdc)
379 {
380 struct tegra_dma *tdma = tdc->tdma;
381
382 if (tdma->chip_data->support_channel_pause) {
383 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE, 0);
384 } else {
385 tegra_dma_global_resume(tdc);
386 }
387 }
388
389 static void tegra_dma_stop(struct tegra_dma_channel *tdc)
390 {
391 u32 csr;
392 u32 status;
393
394 /* Disable interrupts */
395 csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
396 csr &= ~TEGRA_APBDMA_CSR_IE_EOC;
397 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
398
399 /* Disable DMA */
400 csr &= ~TEGRA_APBDMA_CSR_ENB;
401 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr);
402
403 /* Clear interrupt status if it is there */
404 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
405 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
406 dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__);
407 tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
408 }
409 tdc->busy = false;
410 }
411
412 static void tegra_dma_start(struct tegra_dma_channel *tdc,
413 struct tegra_dma_sg_req *sg_req)
414 {
415 struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs;
416
417 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, ch_regs->csr);
418 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_regs->apb_seq);
419 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_regs->apb_ptr);
420 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_regs->ahb_seq);
421 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_regs->ahb_ptr);
422
423 /* Start DMA */
424 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
425 ch_regs->csr | TEGRA_APBDMA_CSR_ENB);
426 }
427
428 static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc,
429 struct tegra_dma_sg_req *nsg_req)
430 {
431 unsigned long status;
432
433 /*
434 * The DMA controller reloads the new configuration for next transfer
435 * after last burst of current transfer completes.
436 * If there is no IEC status then this makes sure that last burst
437 * has not be completed. There may be case that last burst is on
438 * flight and so it can complete but because DMA is paused, it
439 * will not generates interrupt as well as not reload the new
440 * configuration.
441 * If there is already IEC status then interrupt handler need to
442 * load new configuration.
443 */
444 tegra_dma_pause(tdc, false);
445 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
446
447 /*
448 * If interrupt is pending then do nothing as the ISR will handle
449 * the programing for new request.
450 */
451 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
452 dev_err(tdc2dev(tdc),
453 "Skipping new configuration as interrupt is pending\n");
454 tegra_dma_resume(tdc);
455 return;
456 }
457
458 /* Safe to program new configuration */
459 tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->ch_regs.apb_ptr);
460 tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr);
461 tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
462 nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
463 nsg_req->configured = true;
464
465 tegra_dma_resume(tdc);
466 }
467
468 static void tdc_start_head_req(struct tegra_dma_channel *tdc)
469 {
470 struct tegra_dma_sg_req *sg_req;
471
472 if (list_empty(&tdc->pending_sg_req))
473 return;
474
475 sg_req = list_first_entry(&tdc->pending_sg_req,
476 typeof(*sg_req), node);
477 tegra_dma_start(tdc, sg_req);
478 sg_req->configured = true;
479 tdc->busy = true;
480 }
481
482 static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc)
483 {
484 struct tegra_dma_sg_req *hsgreq;
485 struct tegra_dma_sg_req *hnsgreq;
486
487 if (list_empty(&tdc->pending_sg_req))
488 return;
489
490 hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
491 if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) {
492 hnsgreq = list_first_entry(&hsgreq->node,
493 typeof(*hnsgreq), node);
494 tegra_dma_configure_for_next(tdc, hnsgreq);
495 }
496 }
497
498 static inline int get_current_xferred_count(struct tegra_dma_channel *tdc,
499 struct tegra_dma_sg_req *sg_req, unsigned long status)
500 {
501 return sg_req->req_len - (status & TEGRA_APBDMA_STATUS_COUNT_MASK) - 4;
502 }
503
504 static void tegra_dma_abort_all(struct tegra_dma_channel *tdc)
505 {
506 struct tegra_dma_sg_req *sgreq;
507 struct tegra_dma_desc *dma_desc;
508
509 while (!list_empty(&tdc->pending_sg_req)) {
510 sgreq = list_first_entry(&tdc->pending_sg_req,
511 typeof(*sgreq), node);
512 list_move_tail(&sgreq->node, &tdc->free_sg_req);
513 if (sgreq->last_sg) {
514 dma_desc = sgreq->dma_desc;
515 dma_desc->dma_status = DMA_ERROR;
516 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
517
518 /* Add in cb list if it is not there. */
519 if (!dma_desc->cb_count)
520 list_add_tail(&dma_desc->cb_node,
521 &tdc->cb_desc);
522 dma_desc->cb_count++;
523 }
524 }
525 tdc->isr_handler = NULL;
526 }
527
528 static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
529 struct tegra_dma_sg_req *last_sg_req, bool to_terminate)
530 {
531 struct tegra_dma_sg_req *hsgreq = NULL;
532
533 if (list_empty(&tdc->pending_sg_req)) {
534 dev_err(tdc2dev(tdc), "Dma is running without req\n");
535 tegra_dma_stop(tdc);
536 return false;
537 }
538
539 /*
540 * Check that head req on list should be in flight.
541 * If it is not in flight then abort transfer as
542 * looping of transfer can not continue.
543 */
544 hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
545 if (!hsgreq->configured) {
546 tegra_dma_stop(tdc);
547 dev_err(tdc2dev(tdc), "Error in dma transfer, aborting dma\n");
548 tegra_dma_abort_all(tdc);
549 return false;
550 }
551
552 /* Configure next request */
553 if (!to_terminate)
554 tdc_configure_next_head_desc(tdc);
555 return true;
556 }
557
558 static void handle_once_dma_done(struct tegra_dma_channel *tdc,
559 bool to_terminate)
560 {
561 struct tegra_dma_sg_req *sgreq;
562 struct tegra_dma_desc *dma_desc;
563
564 tdc->busy = false;
565 sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
566 dma_desc = sgreq->dma_desc;
567 dma_desc->bytes_transferred += sgreq->req_len;
568
569 list_del(&sgreq->node);
570 if (sgreq->last_sg) {
571 dma_desc->dma_status = DMA_SUCCESS;
572 dma_cookie_complete(&dma_desc->txd);
573 if (!dma_desc->cb_count)
574 list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
575 dma_desc->cb_count++;
576 list_add_tail(&dma_desc->node, &tdc->free_dma_desc);
577 }
578 list_add_tail(&sgreq->node, &tdc->free_sg_req);
579
580 /* Do not start DMA if it is going to be terminate */
581 if (to_terminate || list_empty(&tdc->pending_sg_req))
582 return;
583
584 tdc_start_head_req(tdc);
585 return;
586 }
587
588 static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc,
589 bool to_terminate)
590 {
591 struct tegra_dma_sg_req *sgreq;
592 struct tegra_dma_desc *dma_desc;
593 bool st;
594
595 sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node);
596 dma_desc = sgreq->dma_desc;
597 dma_desc->bytes_transferred += sgreq->req_len;
598
599 /* Callback need to be call */
600 if (!dma_desc->cb_count)
601 list_add_tail(&dma_desc->cb_node, &tdc->cb_desc);
602 dma_desc->cb_count++;
603
604 /* If not last req then put at end of pending list */
605 if (!list_is_last(&sgreq->node, &tdc->pending_sg_req)) {
606 list_move_tail(&sgreq->node, &tdc->pending_sg_req);
607 sgreq->configured = false;
608 st = handle_continuous_head_request(tdc, sgreq, to_terminate);
609 if (!st)
610 dma_desc->dma_status = DMA_ERROR;
611 }
612 return;
613 }
614
615 static void tegra_dma_tasklet(unsigned long data)
616 {
617 struct tegra_dma_channel *tdc = (struct tegra_dma_channel *)data;
618 dma_async_tx_callback callback = NULL;
619 void *callback_param = NULL;
620 struct tegra_dma_desc *dma_desc;
621 unsigned long flags;
622 int cb_count;
623
624 spin_lock_irqsave(&tdc->lock, flags);
625 while (!list_empty(&tdc->cb_desc)) {
626 dma_desc = list_first_entry(&tdc->cb_desc,
627 typeof(*dma_desc), cb_node);
628 list_del(&dma_desc->cb_node);
629 callback = dma_desc->txd.callback;
630 callback_param = dma_desc->txd.callback_param;
631 cb_count = dma_desc->cb_count;
632 dma_desc->cb_count = 0;
633 spin_unlock_irqrestore(&tdc->lock, flags);
634 while (cb_count-- && callback)
635 callback(callback_param);
636 spin_lock_irqsave(&tdc->lock, flags);
637 }
638 spin_unlock_irqrestore(&tdc->lock, flags);
639 }
640
641 static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
642 {
643 struct tegra_dma_channel *tdc = dev_id;
644 unsigned long status;
645 unsigned long flags;
646
647 spin_lock_irqsave(&tdc->lock, flags);
648
649 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
650 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
651 tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
652 tdc->isr_handler(tdc, false);
653 tasklet_schedule(&tdc->tasklet);
654 spin_unlock_irqrestore(&tdc->lock, flags);
655 return IRQ_HANDLED;
656 }
657
658 spin_unlock_irqrestore(&tdc->lock, flags);
659 dev_info(tdc2dev(tdc),
660 "Interrupt already served status 0x%08lx\n", status);
661 return IRQ_NONE;
662 }
663
664 static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd)
665 {
666 struct tegra_dma_desc *dma_desc = txd_to_tegra_dma_desc(txd);
667 struct tegra_dma_channel *tdc = to_tegra_dma_chan(txd->chan);
668 unsigned long flags;
669 dma_cookie_t cookie;
670
671 spin_lock_irqsave(&tdc->lock, flags);
672 dma_desc->dma_status = DMA_IN_PROGRESS;
673 cookie = dma_cookie_assign(&dma_desc->txd);
674 list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req);
675 spin_unlock_irqrestore(&tdc->lock, flags);
676 return cookie;
677 }
678
679 static void tegra_dma_issue_pending(struct dma_chan *dc)
680 {
681 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
682 unsigned long flags;
683
684 spin_lock_irqsave(&tdc->lock, flags);
685 if (list_empty(&tdc->pending_sg_req)) {
686 dev_err(tdc2dev(tdc), "No DMA request\n");
687 goto end;
688 }
689 if (!tdc->busy) {
690 tdc_start_head_req(tdc);
691
692 /* Continuous single mode: Configure next req */
693 if (tdc->cyclic) {
694 /*
695 * Wait for 1 burst time for configure DMA for
696 * next transfer.
697 */
698 udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME);
699 tdc_configure_next_head_desc(tdc);
700 }
701 }
702 end:
703 spin_unlock_irqrestore(&tdc->lock, flags);
704 return;
705 }
706
707 static void tegra_dma_terminate_all(struct dma_chan *dc)
708 {
709 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
710 struct tegra_dma_sg_req *sgreq;
711 struct tegra_dma_desc *dma_desc;
712 unsigned long flags;
713 unsigned long status;
714 bool was_busy;
715
716 spin_lock_irqsave(&tdc->lock, flags);
717 if (list_empty(&tdc->pending_sg_req)) {
718 spin_unlock_irqrestore(&tdc->lock, flags);
719 return;
720 }
721
722 if (!tdc->busy)
723 goto skip_dma_stop;
724
725 /* Pause DMA before checking the queue status */
726 tegra_dma_pause(tdc, true);
727
728 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
729 if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
730 dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__);
731 tdc->isr_handler(tdc, true);
732 status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
733 }
734
735 was_busy = tdc->busy;
736 tegra_dma_stop(tdc);
737
738 if (!list_empty(&tdc->pending_sg_req) && was_busy) {
739 sgreq = list_first_entry(&tdc->pending_sg_req,
740 typeof(*sgreq), node);
741 sgreq->dma_desc->bytes_transferred +=
742 get_current_xferred_count(tdc, sgreq, status);
743 }
744 tegra_dma_resume(tdc);
745
746 skip_dma_stop:
747 tegra_dma_abort_all(tdc);
748
749 while (!list_empty(&tdc->cb_desc)) {
750 dma_desc = list_first_entry(&tdc->cb_desc,
751 typeof(*dma_desc), cb_node);
752 list_del(&dma_desc->cb_node);
753 dma_desc->cb_count = 0;
754 }
755 spin_unlock_irqrestore(&tdc->lock, flags);
756 }
757
758 static enum dma_status tegra_dma_tx_status(struct dma_chan *dc,
759 dma_cookie_t cookie, struct dma_tx_state *txstate)
760 {
761 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
762 struct tegra_dma_desc *dma_desc;
763 struct tegra_dma_sg_req *sg_req;
764 enum dma_status ret;
765 unsigned long flags;
766 unsigned int residual;
767
768 spin_lock_irqsave(&tdc->lock, flags);
769
770 ret = dma_cookie_status(dc, cookie, txstate);
771 if (ret == DMA_SUCCESS) {
772 spin_unlock_irqrestore(&tdc->lock, flags);
773 return ret;
774 }
775
776 /* Check on wait_ack desc status */
777 list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
778 if (dma_desc->txd.cookie == cookie) {
779 residual = dma_desc->bytes_requested -
780 (dma_desc->bytes_transferred %
781 dma_desc->bytes_requested);
782 dma_set_residue(txstate, residual);
783 ret = dma_desc->dma_status;
784 spin_unlock_irqrestore(&tdc->lock, flags);
785 return ret;
786 }
787 }
788
789 /* Check in pending list */
790 list_for_each_entry(sg_req, &tdc->pending_sg_req, node) {
791 dma_desc = sg_req->dma_desc;
792 if (dma_desc->txd.cookie == cookie) {
793 residual = dma_desc->bytes_requested -
794 (dma_desc->bytes_transferred %
795 dma_desc->bytes_requested);
796 dma_set_residue(txstate, residual);
797 ret = dma_desc->dma_status;
798 spin_unlock_irqrestore(&tdc->lock, flags);
799 return ret;
800 }
801 }
802
803 dev_dbg(tdc2dev(tdc), "cookie %d does not found\n", cookie);
804 spin_unlock_irqrestore(&tdc->lock, flags);
805 return ret;
806 }
807
808 static int tegra_dma_device_control(struct dma_chan *dc, enum dma_ctrl_cmd cmd,
809 unsigned long arg)
810 {
811 switch (cmd) {
812 case DMA_SLAVE_CONFIG:
813 return tegra_dma_slave_config(dc,
814 (struct dma_slave_config *)arg);
815
816 case DMA_TERMINATE_ALL:
817 tegra_dma_terminate_all(dc);
818 return 0;
819
820 default:
821 break;
822 }
823
824 return -ENXIO;
825 }
826
827 static inline int get_bus_width(struct tegra_dma_channel *tdc,
828 enum dma_slave_buswidth slave_bw)
829 {
830 switch (slave_bw) {
831 case DMA_SLAVE_BUSWIDTH_1_BYTE:
832 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8;
833 case DMA_SLAVE_BUSWIDTH_2_BYTES:
834 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16;
835 case DMA_SLAVE_BUSWIDTH_4_BYTES:
836 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
837 case DMA_SLAVE_BUSWIDTH_8_BYTES:
838 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64;
839 default:
840 dev_warn(tdc2dev(tdc),
841 "slave bw is not supported, using 32bits\n");
842 return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32;
843 }
844 }
845
846 static inline int get_burst_size(struct tegra_dma_channel *tdc,
847 u32 burst_size, enum dma_slave_buswidth slave_bw, int len)
848 {
849 int burst_byte;
850 int burst_ahb_width;
851
852 /*
853 * burst_size from client is in terms of the bus_width.
854 * convert them into AHB memory width which is 4 byte.
855 */
856 burst_byte = burst_size * slave_bw;
857 burst_ahb_width = burst_byte / 4;
858
859 /* If burst size is 0 then calculate the burst size based on length */
860 if (!burst_ahb_width) {
861 if (len & 0xF)
862 return TEGRA_APBDMA_AHBSEQ_BURST_1;
863 else if ((len >> 4) & 0x1)
864 return TEGRA_APBDMA_AHBSEQ_BURST_4;
865 else
866 return TEGRA_APBDMA_AHBSEQ_BURST_8;
867 }
868 if (burst_ahb_width < 4)
869 return TEGRA_APBDMA_AHBSEQ_BURST_1;
870 else if (burst_ahb_width < 8)
871 return TEGRA_APBDMA_AHBSEQ_BURST_4;
872 else
873 return TEGRA_APBDMA_AHBSEQ_BURST_8;
874 }
875
876 static int get_transfer_param(struct tegra_dma_channel *tdc,
877 enum dma_transfer_direction direction, unsigned long *apb_addr,
878 unsigned long *apb_seq, unsigned long *csr, unsigned int *burst_size,
879 enum dma_slave_buswidth *slave_bw)
880 {
881
882 switch (direction) {
883 case DMA_MEM_TO_DEV:
884 *apb_addr = tdc->dma_sconfig.dst_addr;
885 *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width);
886 *burst_size = tdc->dma_sconfig.dst_maxburst;
887 *slave_bw = tdc->dma_sconfig.dst_addr_width;
888 *csr = TEGRA_APBDMA_CSR_DIR;
889 return 0;
890
891 case DMA_DEV_TO_MEM:
892 *apb_addr = tdc->dma_sconfig.src_addr;
893 *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width);
894 *burst_size = tdc->dma_sconfig.src_maxburst;
895 *slave_bw = tdc->dma_sconfig.src_addr_width;
896 *csr = 0;
897 return 0;
898
899 default:
900 dev_err(tdc2dev(tdc), "Dma direction is not supported\n");
901 return -EINVAL;
902 }
903 return -EINVAL;
904 }
905
906 static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
907 struct dma_chan *dc, struct scatterlist *sgl, unsigned int sg_len,
908 enum dma_transfer_direction direction, unsigned long flags,
909 void *context)
910 {
911 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
912 struct tegra_dma_desc *dma_desc;
913 unsigned int i;
914 struct scatterlist *sg;
915 unsigned long csr, ahb_seq, apb_ptr, apb_seq;
916 struct list_head req_list;
917 struct tegra_dma_sg_req *sg_req = NULL;
918 u32 burst_size;
919 enum dma_slave_buswidth slave_bw;
920 int ret;
921
922 if (!tdc->config_init) {
923 dev_err(tdc2dev(tdc), "dma channel is not configured\n");
924 return NULL;
925 }
926 if (sg_len < 1) {
927 dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len);
928 return NULL;
929 }
930
931 ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
932 &burst_size, &slave_bw);
933 if (ret < 0)
934 return NULL;
935
936 INIT_LIST_HEAD(&req_list);
937
938 ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
939 ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
940 TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
941 ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
942
943 csr |= TEGRA_APBDMA_CSR_ONCE | TEGRA_APBDMA_CSR_FLOW;
944 csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
945 if (flags & DMA_PREP_INTERRUPT)
946 csr |= TEGRA_APBDMA_CSR_IE_EOC;
947
948 apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
949
950 dma_desc = tegra_dma_desc_get(tdc);
951 if (!dma_desc) {
952 dev_err(tdc2dev(tdc), "Dma descriptors not available\n");
953 return NULL;
954 }
955 INIT_LIST_HEAD(&dma_desc->tx_list);
956 INIT_LIST_HEAD(&dma_desc->cb_node);
957 dma_desc->cb_count = 0;
958 dma_desc->bytes_requested = 0;
959 dma_desc->bytes_transferred = 0;
960 dma_desc->dma_status = DMA_IN_PROGRESS;
961
962 /* Make transfer requests */
963 for_each_sg(sgl, sg, sg_len, i) {
964 u32 len, mem;
965
966 mem = sg_dma_address(sg);
967 len = sg_dma_len(sg);
968
969 if ((len & 3) || (mem & 3) ||
970 (len > tdc->tdma->chip_data->max_dma_count)) {
971 dev_err(tdc2dev(tdc),
972 "Dma length/memory address is not supported\n");
973 tegra_dma_desc_put(tdc, dma_desc);
974 return NULL;
975 }
976
977 sg_req = tegra_dma_sg_req_get(tdc);
978 if (!sg_req) {
979 dev_err(tdc2dev(tdc), "Dma sg-req not available\n");
980 tegra_dma_desc_put(tdc, dma_desc);
981 return NULL;
982 }
983
984 ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
985 dma_desc->bytes_requested += len;
986
987 sg_req->ch_regs.apb_ptr = apb_ptr;
988 sg_req->ch_regs.ahb_ptr = mem;
989 sg_req->ch_regs.csr = csr | ((len - 4) & 0xFFFC);
990 sg_req->ch_regs.apb_seq = apb_seq;
991 sg_req->ch_regs.ahb_seq = ahb_seq;
992 sg_req->configured = false;
993 sg_req->last_sg = false;
994 sg_req->dma_desc = dma_desc;
995 sg_req->req_len = len;
996
997 list_add_tail(&sg_req->node, &dma_desc->tx_list);
998 }
999 sg_req->last_sg = true;
1000 if (flags & DMA_CTRL_ACK)
1001 dma_desc->txd.flags = DMA_CTRL_ACK;
1002
1003 /*
1004 * Make sure that mode should not be conflicting with currently
1005 * configured mode.
1006 */
1007 if (!tdc->isr_handler) {
1008 tdc->isr_handler = handle_once_dma_done;
1009 tdc->cyclic = false;
1010 } else {
1011 if (tdc->cyclic) {
1012 dev_err(tdc2dev(tdc), "DMA configured in cyclic mode\n");
1013 tegra_dma_desc_put(tdc, dma_desc);
1014 return NULL;
1015 }
1016 }
1017
1018 return &dma_desc->txd;
1019 }
1020
1021 struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic(
1022 struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
1023 size_t period_len, enum dma_transfer_direction direction,
1024 unsigned long flags, void *context)
1025 {
1026 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
1027 struct tegra_dma_desc *dma_desc = NULL;
1028 struct tegra_dma_sg_req *sg_req = NULL;
1029 unsigned long csr, ahb_seq, apb_ptr, apb_seq;
1030 int len;
1031 size_t remain_len;
1032 dma_addr_t mem = buf_addr;
1033 u32 burst_size;
1034 enum dma_slave_buswidth slave_bw;
1035 int ret;
1036
1037 if (!buf_len || !period_len) {
1038 dev_err(tdc2dev(tdc), "Invalid buffer/period len\n");
1039 return NULL;
1040 }
1041
1042 if (!tdc->config_init) {
1043 dev_err(tdc2dev(tdc), "DMA slave is not configured\n");
1044 return NULL;
1045 }
1046
1047 /*
1048 * We allow to take more number of requests till DMA is
1049 * not started. The driver will loop over all requests.
1050 * Once DMA is started then new requests can be queued only after
1051 * terminating the DMA.
1052 */
1053 if (tdc->busy) {
1054 dev_err(tdc2dev(tdc), "Request not allowed when dma running\n");
1055 return NULL;
1056 }
1057
1058 /*
1059 * We only support cycle transfer when buf_len is multiple of
1060 * period_len.
1061 */
1062 if (buf_len % period_len) {
1063 dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n");
1064 return NULL;
1065 }
1066
1067 len = period_len;
1068 if ((len & 3) || (buf_addr & 3) ||
1069 (len > tdc->tdma->chip_data->max_dma_count)) {
1070 dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n");
1071 return NULL;
1072 }
1073
1074 ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr,
1075 &burst_size, &slave_bw);
1076 if (ret < 0)
1077 return NULL;
1078
1079
1080 ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB;
1081 ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE <<
1082 TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
1083 ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
1084
1085 csr |= TEGRA_APBDMA_CSR_FLOW;
1086 if (flags & DMA_PREP_INTERRUPT)
1087 csr |= TEGRA_APBDMA_CSR_IE_EOC;
1088 csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
1089
1090 apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
1091
1092 dma_desc = tegra_dma_desc_get(tdc);
1093 if (!dma_desc) {
1094 dev_err(tdc2dev(tdc), "not enough descriptors available\n");
1095 return NULL;
1096 }
1097
1098 INIT_LIST_HEAD(&dma_desc->tx_list);
1099 INIT_LIST_HEAD(&dma_desc->cb_node);
1100 dma_desc->cb_count = 0;
1101
1102 dma_desc->bytes_transferred = 0;
1103 dma_desc->bytes_requested = buf_len;
1104 remain_len = buf_len;
1105
1106 /* Split transfer equal to period size */
1107 while (remain_len) {
1108 sg_req = tegra_dma_sg_req_get(tdc);
1109 if (!sg_req) {
1110 dev_err(tdc2dev(tdc), "Dma sg-req not available\n");
1111 tegra_dma_desc_put(tdc, dma_desc);
1112 return NULL;
1113 }
1114
1115 ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
1116 sg_req->ch_regs.apb_ptr = apb_ptr;
1117 sg_req->ch_regs.ahb_ptr = mem;
1118 sg_req->ch_regs.csr = csr | ((len - 4) & 0xFFFC);
1119 sg_req->ch_regs.apb_seq = apb_seq;
1120 sg_req->ch_regs.ahb_seq = ahb_seq;
1121 sg_req->configured = false;
1122 sg_req->half_done = false;
1123 sg_req->last_sg = false;
1124 sg_req->dma_desc = dma_desc;
1125 sg_req->req_len = len;
1126
1127 list_add_tail(&sg_req->node, &dma_desc->tx_list);
1128 remain_len -= len;
1129 mem += len;
1130 }
1131 sg_req->last_sg = true;
1132 if (flags & DMA_CTRL_ACK)
1133 dma_desc->txd.flags = DMA_CTRL_ACK;
1134
1135 /*
1136 * Make sure that mode should not be conflicting with currently
1137 * configured mode.
1138 */
1139 if (!tdc->isr_handler) {
1140 tdc->isr_handler = handle_cont_sngl_cycle_dma_done;
1141 tdc->cyclic = true;
1142 } else {
1143 if (!tdc->cyclic) {
1144 dev_err(tdc2dev(tdc), "DMA configuration conflict\n");
1145 tegra_dma_desc_put(tdc, dma_desc);
1146 return NULL;
1147 }
1148 }
1149
1150 return &dma_desc->txd;
1151 }
1152
1153 static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
1154 {
1155 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
1156 struct tegra_dma *tdma = tdc->tdma;
1157 int ret;
1158
1159 dma_cookie_init(&tdc->dma_chan);
1160 tdc->config_init = false;
1161 ret = clk_prepare_enable(tdma->dma_clk);
1162 if (ret < 0)
1163 dev_err(tdc2dev(tdc), "clk_prepare_enable failed: %d\n", ret);
1164 return ret;
1165 }
1166
1167 static void tegra_dma_free_chan_resources(struct dma_chan *dc)
1168 {
1169 struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc);
1170 struct tegra_dma *tdma = tdc->tdma;
1171
1172 struct tegra_dma_desc *dma_desc;
1173 struct tegra_dma_sg_req *sg_req;
1174 struct list_head dma_desc_list;
1175 struct list_head sg_req_list;
1176 unsigned long flags;
1177
1178 INIT_LIST_HEAD(&dma_desc_list);
1179 INIT_LIST_HEAD(&sg_req_list);
1180
1181 dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id);
1182
1183 if (tdc->busy)
1184 tegra_dma_terminate_all(dc);
1185
1186 spin_lock_irqsave(&tdc->lock, flags);
1187 list_splice_init(&tdc->pending_sg_req, &sg_req_list);
1188 list_splice_init(&tdc->free_sg_req, &sg_req_list);
1189 list_splice_init(&tdc->free_dma_desc, &dma_desc_list);
1190 INIT_LIST_HEAD(&tdc->cb_desc);
1191 tdc->config_init = false;
1192 spin_unlock_irqrestore(&tdc->lock, flags);
1193
1194 while (!list_empty(&dma_desc_list)) {
1195 dma_desc = list_first_entry(&dma_desc_list,
1196 typeof(*dma_desc), node);
1197 list_del(&dma_desc->node);
1198 kfree(dma_desc);
1199 }
1200
1201 while (!list_empty(&sg_req_list)) {
1202 sg_req = list_first_entry(&sg_req_list, typeof(*sg_req), node);
1203 list_del(&sg_req->node);
1204 kfree(sg_req);
1205 }
1206 clk_disable_unprepare(tdma->dma_clk);
1207 }
1208
1209 /* Tegra20 specific DMA controller information */
1210 static const struct tegra_dma_chip_data tegra20_dma_chip_data = {
1211 .nr_channels = 16,
1212 .max_dma_count = 1024UL * 64,
1213 .support_channel_pause = false,
1214 };
1215
1216 #if defined(CONFIG_OF)
1217 /* Tegra30 specific DMA controller information */
1218 static const struct tegra_dma_chip_data tegra30_dma_chip_data = {
1219 .nr_channels = 32,
1220 .max_dma_count = 1024UL * 64,
1221 .support_channel_pause = false,
1222 };
1223
1224 /* Tegra114 specific DMA controller information */
1225 static const struct tegra_dma_chip_data tegra114_dma_chip_data = {
1226 .nr_channels = 32,
1227 .max_dma_count = 1024UL * 64,
1228 .support_channel_pause = true,
1229 };
1230
1231
1232 static const struct of_device_id tegra_dma_of_match[] = {
1233 {
1234 .compatible = "nvidia,tegra114-apbdma",
1235 .data = &tegra114_dma_chip_data,
1236 }, {
1237 .compatible = "nvidia,tegra30-apbdma",
1238 .data = &tegra30_dma_chip_data,
1239 }, {
1240 .compatible = "nvidia,tegra20-apbdma",
1241 .data = &tegra20_dma_chip_data,
1242 }, {
1243 },
1244 };
1245 MODULE_DEVICE_TABLE(of, tegra_dma_of_match);
1246 #endif
1247
1248 static int tegra_dma_probe(struct platform_device *pdev)
1249 {
1250 struct resource *res;
1251 struct tegra_dma *tdma;
1252 int ret;
1253 int i;
1254 const struct tegra_dma_chip_data *cdata = NULL;
1255
1256 if (pdev->dev.of_node) {
1257 const struct of_device_id *match;
1258 match = of_match_device(of_match_ptr(tegra_dma_of_match),
1259 &pdev->dev);
1260 if (!match) {
1261 dev_err(&pdev->dev, "Error: No device match found\n");
1262 return -ENODEV;
1263 }
1264 cdata = match->data;
1265 } else {
1266 /* If no device tree then fallback to tegra20 */
1267 cdata = &tegra20_dma_chip_data;
1268 }
1269
1270 tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
1271 sizeof(struct tegra_dma_channel), GFP_KERNEL);
1272 if (!tdma) {
1273 dev_err(&pdev->dev, "Error: memory allocation failed\n");
1274 return -ENOMEM;
1275 }
1276
1277 tdma->dev = &pdev->dev;
1278 tdma->chip_data = cdata;
1279 platform_set_drvdata(pdev, tdma);
1280
1281 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1282 if (!res) {
1283 dev_err(&pdev->dev, "No mem resource for DMA\n");
1284 return -EINVAL;
1285 }
1286
1287 tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
1288 if (IS_ERR(tdma->base_addr))
1289 return PTR_ERR(tdma->base_addr);
1290
1291 tdma->dma_clk = devm_clk_get(&pdev->dev, NULL);
1292 if (IS_ERR(tdma->dma_clk)) {
1293 dev_err(&pdev->dev, "Error: Missing controller clock\n");
1294 return PTR_ERR(tdma->dma_clk);
1295 }
1296
1297 spin_lock_init(&tdma->global_lock);
1298
1299 pm_runtime_enable(&pdev->dev);
1300 if (!pm_runtime_enabled(&pdev->dev)) {
1301 ret = tegra_dma_runtime_resume(&pdev->dev);
1302 if (ret) {
1303 dev_err(&pdev->dev, "dma_runtime_resume failed %d\n",
1304 ret);
1305 goto err_pm_disable;
1306 }
1307 }
1308
1309 /* Enable clock before accessing registers */
1310 ret = clk_prepare_enable(tdma->dma_clk);
1311 if (ret < 0) {
1312 dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);
1313 goto err_pm_disable;
1314 }
1315
1316 /* Reset DMA controller */
1317 tegra_periph_reset_assert(tdma->dma_clk);
1318 udelay(2);
1319 tegra_periph_reset_deassert(tdma->dma_clk);
1320
1321 /* Enable global DMA registers */
1322 tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE);
1323 tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);
1324 tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul);
1325
1326 clk_disable_unprepare(tdma->dma_clk);
1327
1328 INIT_LIST_HEAD(&tdma->dma_dev.channels);
1329 for (i = 0; i < cdata->nr_channels; i++) {
1330 struct tegra_dma_channel *tdc = &tdma->channels[i];
1331
1332 tdc->chan_base_offset = TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET +
1333 i * TEGRA_APBDMA_CHANNEL_REGISTER_SIZE;
1334
1335 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
1336 if (!res) {
1337 ret = -EINVAL;
1338 dev_err(&pdev->dev, "No irq resource for chan %d\n", i);
1339 goto err_irq;
1340 }
1341 tdc->irq = res->start;
1342 snprintf(tdc->name, sizeof(tdc->name), "apbdma.%d", i);
1343 ret = devm_request_irq(&pdev->dev, tdc->irq,
1344 tegra_dma_isr, 0, tdc->name, tdc);
1345 if (ret) {
1346 dev_err(&pdev->dev,
1347 "request_irq failed with err %d channel %d\n",
1348 i, ret);
1349 goto err_irq;
1350 }
1351
1352 tdc->dma_chan.device = &tdma->dma_dev;
1353 dma_cookie_init(&tdc->dma_chan);
1354 list_add_tail(&tdc->dma_chan.device_node,
1355 &tdma->dma_dev.channels);
1356 tdc->tdma = tdma;
1357 tdc->id = i;
1358
1359 tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
1360 (unsigned long)tdc);
1361 spin_lock_init(&tdc->lock);
1362
1363 INIT_LIST_HEAD(&tdc->pending_sg_req);
1364 INIT_LIST_HEAD(&tdc->free_sg_req);
1365 INIT_LIST_HEAD(&tdc->free_dma_desc);
1366 INIT_LIST_HEAD(&tdc->cb_desc);
1367 }
1368
1369 dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
1370 dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
1371 dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
1372
1373 tdma->dma_dev.dev = &pdev->dev;
1374 tdma->dma_dev.device_alloc_chan_resources =
1375 tegra_dma_alloc_chan_resources;
1376 tdma->dma_dev.device_free_chan_resources =
1377 tegra_dma_free_chan_resources;
1378 tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg;
1379 tdma->dma_dev.device_prep_dma_cyclic = tegra_dma_prep_dma_cyclic;
1380 tdma->dma_dev.device_control = tegra_dma_device_control;
1381 tdma->dma_dev.device_tx_status = tegra_dma_tx_status;
1382 tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending;
1383
1384 ret = dma_async_device_register(&tdma->dma_dev);
1385 if (ret < 0) {
1386 dev_err(&pdev->dev,
1387 "Tegra20 APB DMA driver registration failed %d\n", ret);
1388 goto err_irq;
1389 }
1390
1391 dev_info(&pdev->dev, "Tegra20 APB DMA driver register %d channels\n",
1392 cdata->nr_channels);
1393 return 0;
1394
1395 err_irq:
1396 while (--i >= 0) {
1397 struct tegra_dma_channel *tdc = &tdma->channels[i];
1398 tasklet_kill(&tdc->tasklet);
1399 }
1400
1401 err_pm_disable:
1402 pm_runtime_disable(&pdev->dev);
1403 if (!pm_runtime_status_suspended(&pdev->dev))
1404 tegra_dma_runtime_suspend(&pdev->dev);
1405 return ret;
1406 }
1407
1408 static int tegra_dma_remove(struct platform_device *pdev)
1409 {
1410 struct tegra_dma *tdma = platform_get_drvdata(pdev);
1411 int i;
1412 struct tegra_dma_channel *tdc;
1413
1414 dma_async_device_unregister(&tdma->dma_dev);
1415
1416 for (i = 0; i < tdma->chip_data->nr_channels; ++i) {
1417 tdc = &tdma->channels[i];
1418 tasklet_kill(&tdc->tasklet);
1419 }
1420
1421 pm_runtime_disable(&pdev->dev);
1422 if (!pm_runtime_status_suspended(&pdev->dev))
1423 tegra_dma_runtime_suspend(&pdev->dev);
1424
1425 return 0;
1426 }
1427
1428 static int tegra_dma_runtime_suspend(struct device *dev)
1429 {
1430 struct platform_device *pdev = to_platform_device(dev);
1431 struct tegra_dma *tdma = platform_get_drvdata(pdev);
1432
1433 clk_disable_unprepare(tdma->dma_clk);
1434 return 0;
1435 }
1436
1437 static int tegra_dma_runtime_resume(struct device *dev)
1438 {
1439 struct platform_device *pdev = to_platform_device(dev);
1440 struct tegra_dma *tdma = platform_get_drvdata(pdev);
1441 int ret;
1442
1443 ret = clk_prepare_enable(tdma->dma_clk);
1444 if (ret < 0) {
1445 dev_err(dev, "clk_enable failed: %d\n", ret);
1446 return ret;
1447 }
1448 return 0;
1449 }
1450
1451 static const struct dev_pm_ops tegra_dma_dev_pm_ops = {
1452 #ifdef CONFIG_PM_RUNTIME
1453 .runtime_suspend = tegra_dma_runtime_suspend,
1454 .runtime_resume = tegra_dma_runtime_resume,
1455 #endif
1456 };
1457
1458 static struct platform_driver tegra_dmac_driver = {
1459 .driver = {
1460 .name = "tegra-apbdma",
1461 .owner = THIS_MODULE,
1462 .pm = &tegra_dma_dev_pm_ops,
1463 .of_match_table = of_match_ptr(tegra_dma_of_match),
1464 },
1465 .probe = tegra_dma_probe,
1466 .remove = tegra_dma_remove,
1467 };
1468
1469 module_platform_driver(tegra_dmac_driver);
1470
1471 MODULE_ALIAS("platform:tegra20-apbdma");
1472 MODULE_DESCRIPTION("NVIDIA Tegra APB DMA Controller driver");
1473 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
1474 MODULE_LICENSE("GPL v2");
kernel source for telekom puls (alcatel/mediatek)