1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved.
4  */
5 #ifndef LINUX_DMAENGINE_H
6 #define LINUX_DMAENGINE_H
7 
8 #include <linux/device.h>
9 #include <linux/err.h>
10 #include <linux/uio.h>
11 #include <linux/bug.h>
12 #include <linux/scatterlist.h>
13 #include <linux/bitmap.h>
14 #include <linux/types.h>
15 #include <asm/page.h>
16 
17 /**
18  * typedef dma_cookie_t - an opaque DMA cookie
19  *
20  * if dma_cookie_t is >0 it's a DMA request cookie, <0 it's an error code
21  */
22 typedef s32 dma_cookie_t;
23 #define DMA_MIN_COOKIE	1
24 
dma_submit_error(dma_cookie_t cookie)25 static inline int dma_submit_error(dma_cookie_t cookie)
26 {
27 	return cookie < 0 ? cookie : 0;
28 }
29 
30 /**
31  * enum dma_status - DMA transaction status
32  * @DMA_COMPLETE: transaction completed
33  * @DMA_IN_PROGRESS: transaction not yet processed
34  * @DMA_PAUSED: transaction is paused
35  * @DMA_ERROR: transaction failed
36  */
37 enum dma_status {
38 	DMA_COMPLETE,
39 	DMA_IN_PROGRESS,
40 	DMA_PAUSED,
41 	DMA_ERROR,
42 	DMA_OUT_OF_ORDER,
43 };
44 
45 /**
46  * enum dma_transaction_type - DMA transaction types/indexes
47  *
48  * Note: The DMA_ASYNC_TX capability is not to be set by drivers.  It is
49  * automatically set as dma devices are registered.
50  */
51 enum dma_transaction_type {
52 	DMA_MEMCPY,
53 	DMA_XOR,
54 	DMA_PQ,
55 	DMA_XOR_VAL,
56 	DMA_PQ_VAL,
57 	DMA_MEMSET,
58 	DMA_MEMSET_SG,
59 	DMA_INTERRUPT,
60 	DMA_PRIVATE,
61 	DMA_ASYNC_TX,
62 	DMA_SLAVE,
63 	DMA_CYCLIC,
64 	DMA_INTERLEAVE,
65 	DMA_COMPLETION_NO_ORDER,
66 	DMA_REPEAT,
67 	DMA_LOAD_EOT,
68 /* last transaction type for creation of the capabilities mask */
69 	DMA_TX_TYPE_END,
70 };
71 
72 /**
73  * enum dma_transfer_direction - dma transfer mode and direction indicator
74  * @DMA_MEM_TO_MEM: Async/Memcpy mode
75  * @DMA_MEM_TO_DEV: Slave mode & From Memory to Device
76  * @DMA_DEV_TO_MEM: Slave mode & From Device to Memory
77  * @DMA_DEV_TO_DEV: Slave mode & From Device to Device
78  */
79 enum dma_transfer_direction {
80 	DMA_MEM_TO_MEM,
81 	DMA_MEM_TO_DEV,
82 	DMA_DEV_TO_MEM,
83 	DMA_DEV_TO_DEV,
84 	DMA_TRANS_NONE,
85 };
86 
87 /**
88  * Interleaved Transfer Request
89  * ----------------------------
90  * A chunk is collection of contiguous bytes to be transferred.
91  * The gap(in bytes) between two chunks is called inter-chunk-gap(ICG).
92  * ICGs may or may not change between chunks.
93  * A FRAME is the smallest series of contiguous {chunk,icg} pairs,
94  *  that when repeated an integral number of times, specifies the transfer.
95  * A transfer template is specification of a Frame, the number of times
96  *  it is to be repeated and other per-transfer attributes.
97  *
98  * Practically, a client driver would have ready a template for each
99  *  type of transfer it is going to need during its lifetime and
100  *  set only 'src_start' and 'dst_start' before submitting the requests.
101  *
102  *
103  *  |      Frame-1        |       Frame-2       | ~ |       Frame-'numf'  |
104  *  |====....==.===...=...|====....==.===...=...| ~ |====....==.===...=...|
105  *
106  *    ==  Chunk size
107  *    ... ICG
108  */
109 
110 /**
111  * struct data_chunk - Element of scatter-gather list that makes a frame.
112  * @size: Number of bytes to read from source.
113  *	  size_dst := fn(op, size_src), so doesn't mean much for destination.
114  * @icg: Number of bytes to jump after last src/dst address of this
115  *	 chunk and before first src/dst address for next chunk.
116  *	 Ignored for dst(assumed 0), if dst_inc is true and dst_sgl is false.
117  *	 Ignored for src(assumed 0), if src_inc is true and src_sgl is false.
118  * @dst_icg: Number of bytes to jump after last dst address of this
119  *	 chunk and before the first dst address for next chunk.
120  *	 Ignored if dst_inc is true and dst_sgl is false.
121  * @src_icg: Number of bytes to jump after last src address of this
122  *	 chunk and before the first src address for next chunk.
123  *	 Ignored if src_inc is true and src_sgl is false.
124  */
125 struct data_chunk {
126 	size_t size;
127 	size_t icg;
128 	size_t dst_icg;
129 	size_t src_icg;
130 };
131 
132 /**
133  * struct dma_interleaved_template - Template to convey DMAC the transfer pattern
134  *	 and attributes.
135  * @src_start: Bus address of source for the first chunk.
136  * @dst_start: Bus address of destination for the first chunk.
137  * @dir: Specifies the type of Source and Destination.
138  * @src_inc: If the source address increments after reading from it.
139  * @dst_inc: If the destination address increments after writing to it.
140  * @src_sgl: If the 'icg' of sgl[] applies to Source (scattered read).
141  *		Otherwise, source is read contiguously (icg ignored).
142  *		Ignored if src_inc is false.
143  * @dst_sgl: If the 'icg' of sgl[] applies to Destination (scattered write).
144  *		Otherwise, destination is filled contiguously (icg ignored).
145  *		Ignored if dst_inc is false.
146  * @numf: Number of frames in this template.
147  * @frame_size: Number of chunks in a frame i.e, size of sgl[].
148  * @sgl: Array of {chunk,icg} pairs that make up a frame.
149  */
150 struct dma_interleaved_template {
151 	dma_addr_t src_start;
152 	dma_addr_t dst_start;
153 	enum dma_transfer_direction dir;
154 	bool src_inc;
155 	bool dst_inc;
156 	bool src_sgl;
157 	bool dst_sgl;
158 	size_t numf;
159 	size_t frame_size;
160 	struct data_chunk sgl[];
161 };
162 
163 /**
164  * enum dma_ctrl_flags - DMA flags to augment operation preparation,
165  *  control completion, and communicate status.
166  * @DMA_PREP_INTERRUPT - trigger an interrupt (callback) upon completion of
167  *  this transaction
168  * @DMA_CTRL_ACK - if clear, the descriptor cannot be reused until the client
169  *  acknowledges receipt, i.e. has a chance to establish any dependency
170  *  chains
171  * @DMA_PREP_PQ_DISABLE_P - prevent generation of P while generating Q
172  * @DMA_PREP_PQ_DISABLE_Q - prevent generation of Q while generating P
173  * @DMA_PREP_CONTINUE - indicate to a driver that it is reusing buffers as
174  *  sources that were the result of a previous operation, in the case of a PQ
175  *  operation it continues the calculation with new sources
176  * @DMA_PREP_FENCE - tell the driver that subsequent operations depend
177  *  on the result of this operation
178  * @DMA_CTRL_REUSE: client can reuse the descriptor and submit again till
179  *  cleared or freed
180  * @DMA_PREP_CMD: tell the driver that the data passed to DMA API is command
181  *  data and the descriptor should be in different format from normal
182  *  data descriptors.
183  * @DMA_PREP_REPEAT: tell the driver that the transaction shall be automatically
184  *  repeated when it ends until a transaction is issued on the same channel
185  *  with the DMA_PREP_LOAD_EOT flag set. This flag is only applicable to
186  *  interleaved transactions and is ignored for all other transaction types.
187  * @DMA_PREP_LOAD_EOT: tell the driver that the transaction shall replace any
188  *  active repeated (as indicated by DMA_PREP_REPEAT) transaction when the
189  *  repeated transaction ends. Not setting this flag when the previously queued
190  *  transaction is marked with DMA_PREP_REPEAT will cause the new transaction
191  *  to never be processed and stay in the issued queue forever. The flag is
192  *  ignored if the previous transaction is not a repeated transaction.
193  */
194 enum dma_ctrl_flags {
195 	DMA_PREP_INTERRUPT = (1 << 0),
196 	DMA_CTRL_ACK = (1 << 1),
197 	DMA_PREP_PQ_DISABLE_P = (1 << 2),
198 	DMA_PREP_PQ_DISABLE_Q = (1 << 3),
199 	DMA_PREP_CONTINUE = (1 << 4),
200 	DMA_PREP_FENCE = (1 << 5),
201 	DMA_CTRL_REUSE = (1 << 6),
202 	DMA_PREP_CMD = (1 << 7),
203 	DMA_PREP_REPEAT = (1 << 8),
204 	DMA_PREP_LOAD_EOT = (1 << 9),
205 };
206 
207 /**
208  * enum sum_check_bits - bit position of pq_check_flags
209  */
210 enum sum_check_bits {
211 	SUM_CHECK_P = 0,
212 	SUM_CHECK_Q = 1,
213 };
214 
215 /**
216  * enum pq_check_flags - result of async_{xor,pq}_zero_sum operations
217  * @SUM_CHECK_P_RESULT - 1 if xor zero sum error, 0 otherwise
218  * @SUM_CHECK_Q_RESULT - 1 if reed-solomon zero sum error, 0 otherwise
219  */
220 enum sum_check_flags {
221 	SUM_CHECK_P_RESULT = (1 << SUM_CHECK_P),
222 	SUM_CHECK_Q_RESULT = (1 << SUM_CHECK_Q),
223 };
224 
225 
226 /**
227  * dma_cap_mask_t - capabilities bitmap modeled after cpumask_t.
228  * See linux/cpumask.h
229  */
230 typedef struct { DECLARE_BITMAP(bits, DMA_TX_TYPE_END); } dma_cap_mask_t;
231 
232 /**
233  * enum dma_desc_metadata_mode - per descriptor metadata mode types supported
234  * @DESC_METADATA_CLIENT - the metadata buffer is allocated/provided by the
235  *  client driver and it is attached (via the dmaengine_desc_attach_metadata()
236  *  helper) to the descriptor.
237  *
238  * Client drivers interested to use this mode can follow:
239  * - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
240  *   1. prepare the descriptor (dmaengine_prep_*)
241  *	construct the metadata in the client's buffer
242  *   2. use dmaengine_desc_attach_metadata() to attach the buffer to the
243  *	descriptor
244  *   3. submit the transfer
245  * - DMA_DEV_TO_MEM:
246  *   1. prepare the descriptor (dmaengine_prep_*)
247  *   2. use dmaengine_desc_attach_metadata() to attach the buffer to the
248  *	descriptor
249  *   3. submit the transfer
250  *   4. when the transfer is completed, the metadata should be available in the
251  *	attached buffer
252  *
253  * @DESC_METADATA_ENGINE - the metadata buffer is allocated/managed by the DMA
254  *  driver. The client driver can ask for the pointer, maximum size and the
255  *  currently used size of the metadata and can directly update or read it.
256  *  dmaengine_desc_get_metadata_ptr() and dmaengine_desc_set_metadata_len() is
257  *  provided as helper functions.
258  *
259  *  Note: the metadata area for the descriptor is no longer valid after the
260  *  transfer has been completed (valid up to the point when the completion
261  *  callback returns if used).
262  *
263  * Client drivers interested to use this mode can follow:
264  * - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
265  *   1. prepare the descriptor (dmaengine_prep_*)
266  *   2. use dmaengine_desc_get_metadata_ptr() to get the pointer to the engine's
267  *	metadata area
268  *   3. update the metadata at the pointer
269  *   4. use dmaengine_desc_set_metadata_len()  to tell the DMA engine the amount
270  *	of data the client has placed into the metadata buffer
271  *   5. submit the transfer
272  * - DMA_DEV_TO_MEM:
273  *   1. prepare the descriptor (dmaengine_prep_*)
274  *   2. submit the transfer
275  *   3. on transfer completion, use dmaengine_desc_get_metadata_ptr() to get the
276  *	pointer to the engine's metadata area
277  *   4. Read out the metadata from the pointer
278  *
279  * Note: the two mode is not compatible and clients must use one mode for a
280  * descriptor.
281  */
282 enum dma_desc_metadata_mode {
283 	DESC_METADATA_NONE = 0,
284 	DESC_METADATA_CLIENT = BIT(0),
285 	DESC_METADATA_ENGINE = BIT(1),
286 };
287 
288 /**
289  * struct dma_chan_percpu - the per-CPU part of struct dma_chan
290  * @memcpy_count: transaction counter
291  * @bytes_transferred: byte counter
292  */
293 struct dma_chan_percpu {
294 	/* stats */
295 	unsigned long memcpy_count;
296 	unsigned long bytes_transferred;
297 };
298 
299 /**
300  * struct dma_router - DMA router structure
301  * @dev: pointer to the DMA router device
302  * @route_free: function to be called when the route can be disconnected
303  */
304 struct dma_router {
305 	struct device *dev;
306 	void (*route_free)(struct device *dev, void *route_data);
307 };
308 
309 /**
310  * struct dma_chan - devices supply DMA channels, clients use them
311  * @device: ptr to the dma device who supplies this channel, always !%NULL
312  * @slave: ptr to the device using this channel
313  * @cookie: last cookie value returned to client
314  * @completed_cookie: last completed cookie for this channel
315  * @chan_id: channel ID for sysfs
316  * @dev: class device for sysfs
317  * @name: backlink name for sysfs
318  * @dbg_client_name: slave name for debugfs in format:
319  *	dev_name(requester's dev):channel name, for example: "2b00000.mcasp:tx"
320  * @device_node: used to add this to the device chan list
321  * @local: per-cpu pointer to a struct dma_chan_percpu
322  * @client_count: how many clients are using this channel
323  * @table_count: number of appearances in the mem-to-mem allocation table
324  * @router: pointer to the DMA router structure
325  * @route_data: channel specific data for the router
326  * @private: private data for certain client-channel associations
327  */
328 struct dma_chan {
329 	struct dma_device *device;
330 	struct device *slave;
331 	dma_cookie_t cookie;
332 	dma_cookie_t completed_cookie;
333 
334 	/* sysfs */
335 	int chan_id;
336 	struct dma_chan_dev *dev;
337 	const char *name;
338 #ifdef CONFIG_DEBUG_FS
339 	char *dbg_client_name;
340 #endif
341 
342 	struct list_head device_node;
343 	struct dma_chan_percpu __percpu *local;
344 	int client_count;
345 	int table_count;
346 
347 	/* DMA router */
348 	struct dma_router *router;
349 	void *route_data;
350 
351 	void *private;
352 };
353 
354 /**
355  * struct dma_chan_dev - relate sysfs device node to backing channel device
356  * @chan: driver channel device
357  * @device: sysfs device
358  * @dev_id: parent dma_device dev_id
359  * @chan_dma_dev: The channel is using custom/different dma-mapping
360  * compared to the parent dma_device
361  */
362 struct dma_chan_dev {
363 	struct dma_chan *chan;
364 	struct device device;
365 	int dev_id;
366 	bool chan_dma_dev;
367 };
368 
369 /**
370  * enum dma_slave_buswidth - defines bus width of the DMA slave
371  * device, source or target buses
372  */
373 enum dma_slave_buswidth {
374 	DMA_SLAVE_BUSWIDTH_UNDEFINED = 0,
375 	DMA_SLAVE_BUSWIDTH_1_BYTE = 1,
376 	DMA_SLAVE_BUSWIDTH_2_BYTES = 2,
377 	DMA_SLAVE_BUSWIDTH_3_BYTES = 3,
378 	DMA_SLAVE_BUSWIDTH_4_BYTES = 4,
379 	DMA_SLAVE_BUSWIDTH_8_BYTES = 8,
380 	DMA_SLAVE_BUSWIDTH_16_BYTES = 16,
381 	DMA_SLAVE_BUSWIDTH_32_BYTES = 32,
382 	DMA_SLAVE_BUSWIDTH_64_BYTES = 64,
383 	DMA_SLAVE_BUSWIDTH_128_BYTES = 128,
384 };
385 
386 /**
387  * struct dma_slave_config - dma slave channel runtime config
388  * @direction: whether the data shall go in or out on this slave
389  * channel, right now. DMA_MEM_TO_DEV and DMA_DEV_TO_MEM are
390  * legal values. DEPRECATED, drivers should use the direction argument
391  * to the device_prep_slave_sg and device_prep_dma_cyclic functions or
392  * the dir field in the dma_interleaved_template structure.
393  * @src_addr: this is the physical address where DMA slave data
394  * should be read (RX), if the source is memory this argument is
395  * ignored.
396  * @dst_addr: this is the physical address where DMA slave data
397  * should be written (TX), if the source is memory this argument
398  * is ignored.
399  * @src_addr_width: this is the width in bytes of the source (RX)
400  * register where DMA data shall be read. If the source
401  * is memory this may be ignored depending on architecture.
402  * Legal values: 1, 2, 3, 4, 8, 16, 32, 64, 128.
403  * @dst_addr_width: same as src_addr_width but for destination
404  * target (TX) mutatis mutandis.
405  * @src_maxburst: the maximum number of words (note: words, as in
406  * units of the src_addr_width member, not bytes) that can be sent
407  * in one burst to the device. Typically something like half the
408  * FIFO depth on I/O peripherals so you don't overflow it. This
409  * may or may not be applicable on memory sources.
410  * @dst_maxburst: same as src_maxburst but for destination target
411  * mutatis mutandis.
412  * @src_port_window_size: The length of the register area in words the data need
413  * to be accessed on the device side. It is only used for devices which is using
414  * an area instead of a single register to receive the data. Typically the DMA
415  * loops in this area in order to transfer the data.
416  * @dst_port_window_size: same as src_port_window_size but for the destination
417  * port.
418  * @device_fc: Flow Controller Settings. Only valid for slave channels. Fill
419  * with 'true' if peripheral should be flow controller. Direction will be
420  * selected at Runtime.
421  * @peripheral_config: peripheral configuration for programming peripheral
422  * for dmaengine transfer
423  * @peripheral_size: peripheral configuration buffer size
424  *
425  * This struct is passed in as configuration data to a DMA engine
426  * in order to set up a certain channel for DMA transport at runtime.
427  * The DMA device/engine has to provide support for an additional
428  * callback in the dma_device structure, device_config and this struct
429  * will then be passed in as an argument to the function.
430  *
431  * The rationale for adding configuration information to this struct is as
432  * follows: if it is likely that more than one DMA slave controllers in
433  * the world will support the configuration option, then make it generic.
434  * If not: if it is fixed so that it be sent in static from the platform
435  * data, then prefer to do that.
436  */
437 struct dma_slave_config {
438 	enum dma_transfer_direction direction;
439 	phys_addr_t src_addr;
440 	phys_addr_t dst_addr;
441 	enum dma_slave_buswidth src_addr_width;
442 	enum dma_slave_buswidth dst_addr_width;
443 	u32 src_maxburst;
444 	u32 dst_maxburst;
445 	u32 src_port_window_size;
446 	u32 dst_port_window_size;
447 	bool device_fc;
448 	void *peripheral_config;
449 	size_t peripheral_size;
450 };
451 
452 /**
453  * enum dma_residue_granularity - Granularity of the reported transfer residue
454  * @DMA_RESIDUE_GRANULARITY_DESCRIPTOR: Residue reporting is not support. The
455  *  DMA channel is only able to tell whether a descriptor has been completed or
456  *  not, which means residue reporting is not supported by this channel. The
457  *  residue field of the dma_tx_state field will always be 0.
458  * @DMA_RESIDUE_GRANULARITY_SEGMENT: Residue is updated after each successfully
459  *  completed segment of the transfer (For cyclic transfers this is after each
460  *  period). This is typically implemented by having the hardware generate an
461  *  interrupt after each transferred segment and then the drivers updates the
462  *  outstanding residue by the size of the segment. Another possibility is if
463  *  the hardware supports scatter-gather and the segment descriptor has a field
464  *  which gets set after the segment has been completed. The driver then counts
465  *  the number of segments without the flag set to compute the residue.
466  * @DMA_RESIDUE_GRANULARITY_BURST: Residue is updated after each transferred
467  *  burst. This is typically only supported if the hardware has a progress
468  *  register of some sort (E.g. a register with the current read/write address
469  *  or a register with the amount of bursts/beats/bytes that have been
470  *  transferred or still need to be transferred).
471  */
472 enum dma_residue_granularity {
473 	DMA_RESIDUE_GRANULARITY_DESCRIPTOR = 0,
474 	DMA_RESIDUE_GRANULARITY_SEGMENT = 1,
475 	DMA_RESIDUE_GRANULARITY_BURST = 2,
476 };
477 
478 /**
479  * struct dma_slave_caps - expose capabilities of a slave channel only
480  * @src_addr_widths: bit mask of src addr widths the channel supports.
481  *	Width is specified in bytes, e.g. for a channel supporting
482  *	a width of 4 the mask should have BIT(4) set.
483  * @dst_addr_widths: bit mask of dst addr widths the channel supports
484  * @directions: bit mask of slave directions the channel supports.
485  *	Since the enum dma_transfer_direction is not defined as bit flag for
486  *	each type, the dma controller should set BIT(<TYPE>) and same
487  *	should be checked by controller as well
488  * @min_burst: min burst capability per-transfer
489  * @max_burst: max burst capability per-transfer
490  * @max_sg_burst: max number of SG list entries executed in a single burst
491  *	DMA tansaction with no software intervention for reinitialization.
492  *	Zero value means unlimited number of entries.
493  * @cmd_pause: true, if pause is supported (i.e. for reading residue or
494  *	       for resume later)
495  * @cmd_resume: true, if resume is supported
496  * @cmd_terminate: true, if terminate cmd is supported
497  * @residue_granularity: granularity of the reported transfer residue
498  * @descriptor_reuse: if a descriptor can be reused by client and
499  * resubmitted multiple times
500  */
501 struct dma_slave_caps {
502 	u32 src_addr_widths;
503 	u32 dst_addr_widths;
504 	u32 directions;
505 	u32 min_burst;
506 	u32 max_burst;
507 	u32 max_sg_burst;
508 	bool cmd_pause;
509 	bool cmd_resume;
510 	bool cmd_terminate;
511 	enum dma_residue_granularity residue_granularity;
512 	bool descriptor_reuse;
513 };
514 
dma_chan_name(struct dma_chan * chan)515 static inline const char *dma_chan_name(struct dma_chan *chan)
516 {
517 	return dev_name(&chan->dev->device);
518 }
519 
520 void dma_chan_cleanup(struct kref *kref);
521 
522 /**
523  * typedef dma_filter_fn - callback filter for dma_request_channel
524  * @chan: channel to be reviewed
525  * @filter_param: opaque parameter passed through dma_request_channel
526  *
527  * When this optional parameter is specified in a call to dma_request_channel a
528  * suitable channel is passed to this routine for further dispositioning before
529  * being returned.  Where 'suitable' indicates a non-busy channel that
530  * satisfies the given capability mask.  It returns 'true' to indicate that the
531  * channel is suitable.
532  */
533 typedef bool (*dma_filter_fn)(struct dma_chan *chan, void *filter_param);
534 
535 typedef void (*dma_async_tx_callback)(void *dma_async_param);
536 
537 enum dmaengine_tx_result {
538 	DMA_TRANS_NOERROR = 0,		/* SUCCESS */
539 	DMA_TRANS_READ_FAILED,		/* Source DMA read failed */
540 	DMA_TRANS_WRITE_FAILED,		/* Destination DMA write failed */
541 	DMA_TRANS_ABORTED,		/* Op never submitted / aborted */
542 };
543 
544 struct dmaengine_result {
545 	enum dmaengine_tx_result result;
546 	u32 residue;
547 };
548 
549 typedef void (*dma_async_tx_callback_result)(void *dma_async_param,
550 				const struct dmaengine_result *result);
551 
552 struct dmaengine_unmap_data {
553 #if IS_ENABLED(CONFIG_DMA_ENGINE_RAID)
554 	u16 map_cnt;
555 #else
556 	u8 map_cnt;
557 #endif
558 	u8 to_cnt;
559 	u8 from_cnt;
560 	u8 bidi_cnt;
561 	struct device *dev;
562 	struct kref kref;
563 	size_t len;
564 	dma_addr_t addr[];
565 };
566 
567 struct dma_async_tx_descriptor;
568 
569 struct dma_descriptor_metadata_ops {
570 	int (*attach)(struct dma_async_tx_descriptor *desc, void *data,
571 		      size_t len);
572 
573 	void *(*get_ptr)(struct dma_async_tx_descriptor *desc,
574 			 size_t *payload_len, size_t *max_len);
575 	int (*set_len)(struct dma_async_tx_descriptor *desc,
576 		       size_t payload_len);
577 };
578 
579 /**
580  * struct dma_async_tx_descriptor - async transaction descriptor
581  * ---dma generic offload fields---
582  * @cookie: tracking cookie for this transaction, set to -EBUSY if
583  *	this tx is sitting on a dependency list
584  * @flags: flags to augment operation preparation, control completion, and
585  *	communicate status
586  * @phys: physical address of the descriptor
587  * @chan: target channel for this operation
588  * @tx_submit: accept the descriptor, assign ordered cookie and mark the
589  * descriptor pending. To be pushed on .issue_pending() call
590  * @callback: routine to call after this operation is complete
591  * @callback_param: general parameter to pass to the callback routine
592  * @desc_metadata_mode: core managed metadata mode to protect mixed use of
593  *	DESC_METADATA_CLIENT or DESC_METADATA_ENGINE. Otherwise
594  *	DESC_METADATA_NONE
595  * @metadata_ops: DMA driver provided metadata mode ops, need to be set by the
596  *	DMA driver if metadata mode is supported with the descriptor
597  * ---async_tx api specific fields---
598  * @next: at completion submit this descriptor
599  * @parent: pointer to the next level up in the dependency chain
600  * @lock: protect the parent and next pointers
601  */
602 struct dma_async_tx_descriptor {
603 	dma_cookie_t cookie;
604 	enum dma_ctrl_flags flags; /* not a 'long' to pack with cookie */
605 	dma_addr_t phys;
606 	struct dma_chan *chan;
607 	dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx);
608 	int (*desc_free)(struct dma_async_tx_descriptor *tx);
609 	dma_async_tx_callback callback;
610 	dma_async_tx_callback_result callback_result;
611 	void *callback_param;
612 	struct dmaengine_unmap_data *unmap;
613 	enum dma_desc_metadata_mode desc_metadata_mode;
614 	struct dma_descriptor_metadata_ops *metadata_ops;
615 #ifdef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH
616 	struct dma_async_tx_descriptor *next;
617 	struct dma_async_tx_descriptor *parent;
618 	spinlock_t lock;
619 #endif
620 };
621 
622 #ifdef CONFIG_DMA_ENGINE
dma_set_unmap(struct dma_async_tx_descriptor * tx,struct dmaengine_unmap_data * unmap)623 static inline void dma_set_unmap(struct dma_async_tx_descriptor *tx,
624 				 struct dmaengine_unmap_data *unmap)
625 {
626 	kref_get(&unmap->kref);
627 	tx->unmap = unmap;
628 }
629 
630 struct dmaengine_unmap_data *
631 dmaengine_get_unmap_data(struct device *dev, int nr, gfp_t flags);
632 void dmaengine_unmap_put(struct dmaengine_unmap_data *unmap);
633 #else
dma_set_unmap(struct dma_async_tx_descriptor * tx,struct dmaengine_unmap_data * unmap)634 static inline void dma_set_unmap(struct dma_async_tx_descriptor *tx,
635 				 struct dmaengine_unmap_data *unmap)
636 {
637 }
638 static inline struct dmaengine_unmap_data *
dmaengine_get_unmap_data(struct device * dev,int nr,gfp_t flags)639 dmaengine_get_unmap_data(struct device *dev, int nr, gfp_t flags)
640 {
641 	return NULL;
642 }
dmaengine_unmap_put(struct dmaengine_unmap_data * unmap)643 static inline void dmaengine_unmap_put(struct dmaengine_unmap_data *unmap)
644 {
645 }
646 #endif
647 
dma_descriptor_unmap(struct dma_async_tx_descriptor * tx)648 static inline void dma_descriptor_unmap(struct dma_async_tx_descriptor *tx)
649 {
650 	if (!tx->unmap)
651 		return;
652 
653 	dmaengine_unmap_put(tx->unmap);
654 	tx->unmap = NULL;
655 }
656 
657 #ifndef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH
txd_lock(struct dma_async_tx_descriptor * txd)658 static inline void txd_lock(struct dma_async_tx_descriptor *txd)
659 {
660 }
txd_unlock(struct dma_async_tx_descriptor * txd)661 static inline void txd_unlock(struct dma_async_tx_descriptor *txd)
662 {
663 }
txd_chain(struct dma_async_tx_descriptor * txd,struct dma_async_tx_descriptor * next)664 static inline void txd_chain(struct dma_async_tx_descriptor *txd, struct dma_async_tx_descriptor *next)
665 {
666 	BUG();
667 }
txd_clear_parent(struct dma_async_tx_descriptor * txd)668 static inline void txd_clear_parent(struct dma_async_tx_descriptor *txd)
669 {
670 }
txd_clear_next(struct dma_async_tx_descriptor * txd)671 static inline void txd_clear_next(struct dma_async_tx_descriptor *txd)
672 {
673 }
txd_next(struct dma_async_tx_descriptor * txd)674 static inline struct dma_async_tx_descriptor *txd_next(struct dma_async_tx_descriptor *txd)
675 {
676 	return NULL;
677 }
txd_parent(struct dma_async_tx_descriptor * txd)678 static inline struct dma_async_tx_descriptor *txd_parent(struct dma_async_tx_descriptor *txd)
679 {
680 	return NULL;
681 }
682 
683 #else
txd_lock(struct dma_async_tx_descriptor * txd)684 static inline void txd_lock(struct dma_async_tx_descriptor *txd)
685 {
686 	spin_lock_bh(&txd->lock);
687 }
txd_unlock(struct dma_async_tx_descriptor * txd)688 static inline void txd_unlock(struct dma_async_tx_descriptor *txd)
689 {
690 	spin_unlock_bh(&txd->lock);
691 }
txd_chain(struct dma_async_tx_descriptor * txd,struct dma_async_tx_descriptor * next)692 static inline void txd_chain(struct dma_async_tx_descriptor *txd, struct dma_async_tx_descriptor *next)
693 {
694 	txd->next = next;
695 	next->parent = txd;
696 }
txd_clear_parent(struct dma_async_tx_descriptor * txd)697 static inline void txd_clear_parent(struct dma_async_tx_descriptor *txd)
698 {
699 	txd->parent = NULL;
700 }
txd_clear_next(struct dma_async_tx_descriptor * txd)701 static inline void txd_clear_next(struct dma_async_tx_descriptor *txd)
702 {
703 	txd->next = NULL;
704 }
txd_parent(struct dma_async_tx_descriptor * txd)705 static inline struct dma_async_tx_descriptor *txd_parent(struct dma_async_tx_descriptor *txd)
706 {
707 	return txd->parent;
708 }
txd_next(struct dma_async_tx_descriptor * txd)709 static inline struct dma_async_tx_descriptor *txd_next(struct dma_async_tx_descriptor *txd)
710 {
711 	return txd->next;
712 }
713 #endif
714 
715 /**
716  * struct dma_tx_state - filled in to report the status of
717  * a transfer.
718  * @last: last completed DMA cookie
719  * @used: last issued DMA cookie (i.e. the one in progress)
720  * @residue: the remaining number of bytes left to transmit
721  *	on the selected transfer for states DMA_IN_PROGRESS and
722  *	DMA_PAUSED if this is implemented in the driver, else 0
723  * @in_flight_bytes: amount of data in bytes cached by the DMA.
724  */
725 struct dma_tx_state {
726 	dma_cookie_t last;
727 	dma_cookie_t used;
728 	u32 residue;
729 	u32 in_flight_bytes;
730 };
731 
732 /**
733  * enum dmaengine_alignment - defines alignment of the DMA async tx
734  * buffers
735  */
736 enum dmaengine_alignment {
737 	DMAENGINE_ALIGN_1_BYTE = 0,
738 	DMAENGINE_ALIGN_2_BYTES = 1,
739 	DMAENGINE_ALIGN_4_BYTES = 2,
740 	DMAENGINE_ALIGN_8_BYTES = 3,
741 	DMAENGINE_ALIGN_16_BYTES = 4,
742 	DMAENGINE_ALIGN_32_BYTES = 5,
743 	DMAENGINE_ALIGN_64_BYTES = 6,
744 	DMAENGINE_ALIGN_128_BYTES = 7,
745 	DMAENGINE_ALIGN_256_BYTES = 8,
746 };
747 
748 /**
749  * struct dma_slave_map - associates slave device and it's slave channel with
750  * parameter to be used by a filter function
751  * @devname: name of the device
752  * @slave: slave channel name
753  * @param: opaque parameter to pass to struct dma_filter.fn
754  */
755 struct dma_slave_map {
756 	const char *devname;
757 	const char *slave;
758 	void *param;
759 };
760 
761 /**
762  * struct dma_filter - information for slave device/channel to filter_fn/param
763  * mapping
764  * @fn: filter function callback
765  * @mapcnt: number of slave device/channel in the map
766  * @map: array of channel to filter mapping data
767  */
768 struct dma_filter {
769 	dma_filter_fn fn;
770 	int mapcnt;
771 	const struct dma_slave_map *map;
772 };
773 
774 /**
775  * struct dma_device - info on the entity supplying DMA services
776  * @chancnt: how many DMA channels are supported
777  * @privatecnt: how many DMA channels are requested by dma_request_channel
778  * @channels: the list of struct dma_chan
779  * @global_node: list_head for global dma_device_list
780  * @filter: information for device/slave to filter function/param mapping
781  * @cap_mask: one or more dma_capability flags
782  * @desc_metadata_modes: supported metadata modes by the DMA device
783  * @max_xor: maximum number of xor sources, 0 if no capability
784  * @max_pq: maximum number of PQ sources and PQ-continue capability
785  * @copy_align: alignment shift for memcpy operations
786  * @xor_align: alignment shift for xor operations
787  * @pq_align: alignment shift for pq operations
788  * @fill_align: alignment shift for memset operations
789  * @dev_id: unique device ID
790  * @dev: struct device reference for dma mapping api
791  * @owner: owner module (automatically set based on the provided dev)
792  * @src_addr_widths: bit mask of src addr widths the device supports
793  *	Width is specified in bytes, e.g. for a device supporting
794  *	a width of 4 the mask should have BIT(4) set.
795  * @dst_addr_widths: bit mask of dst addr widths the device supports
796  * @directions: bit mask of slave directions the device supports.
797  *	Since the enum dma_transfer_direction is not defined as bit flag for
798  *	each type, the dma controller should set BIT(<TYPE>) and same
799  *	should be checked by controller as well
800  * @min_burst: min burst capability per-transfer
801  * @max_burst: max burst capability per-transfer
802  * @max_sg_burst: max number of SG list entries executed in a single burst
803  *	DMA tansaction with no software intervention for reinitialization.
804  *	Zero value means unlimited number of entries.
805  * @residue_granularity: granularity of the transfer residue reported
806  *	by tx_status
807  * @device_alloc_chan_resources: allocate resources and return the
808  *	number of allocated descriptors
809  * @device_router_config: optional callback for DMA router configuration
810  * @device_free_chan_resources: release DMA channel's resources
811  * @device_prep_dma_memcpy: prepares a memcpy operation
812  * @device_prep_dma_xor: prepares a xor operation
813  * @device_prep_dma_xor_val: prepares a xor validation operation
814  * @device_prep_dma_pq: prepares a pq operation
815  * @device_prep_dma_pq_val: prepares a pqzero_sum operation
816  * @device_prep_dma_memset: prepares a memset operation
817  * @device_prep_dma_memset_sg: prepares a memset operation over a scatter list
818  * @device_prep_dma_interrupt: prepares an end of chain interrupt operation
819  * @device_prep_slave_sg: prepares a slave dma operation
820  * @device_prep_dma_cyclic: prepare a cyclic dma operation suitable for audio.
821  *	The function takes a buffer of size buf_len. The callback function will
822  *	be called after period_len bytes have been transferred.
823  * @device_prep_interleaved_dma: Transfer expression in a generic way.
824  * @device_prep_dma_imm_data: DMA's 8 byte immediate data to the dst address
825  * @device_caps: May be used to override the generic DMA slave capabilities
826  *	with per-channel specific ones
827  * @device_config: Pushes a new configuration to a channel, return 0 or an error
828  *	code
829  * @device_pause: Pauses any transfer happening on a channel. Returns
830  *	0 or an error code
831  * @device_resume: Resumes any transfer on a channel previously
832  *	paused. Returns 0 or an error code
833  * @device_terminate_all: Aborts all transfers on a channel. Returns 0
834  *	or an error code
835  * @device_synchronize: Synchronizes the termination of a transfers to the
836  *  current context.
837  * @device_tx_status: poll for transaction completion, the optional
838  *	txstate parameter can be supplied with a pointer to get a
839  *	struct with auxiliary transfer status information, otherwise the call
840  *	will just return a simple status code
841  * @device_issue_pending: push pending transactions to hardware
842  * @descriptor_reuse: a submitted transfer can be resubmitted after completion
843  * @device_release: called sometime atfer dma_async_device_unregister() is
844  *     called and there are no further references to this structure. This
845  *     must be implemented to free resources however many existing drivers
846  *     do not and are therefore not safe to unbind while in use.
847  * @dbg_summary_show: optional routine to show contents in debugfs; default code
848  *     will be used when this is omitted, but custom code can show extra,
849  *     controller specific information.
850  */
851 struct dma_device {
852 	struct kref ref;
853 	unsigned int chancnt;
854 	unsigned int privatecnt;
855 	struct list_head channels;
856 	struct list_head global_node;
857 	struct dma_filter filter;
858 	dma_cap_mask_t  cap_mask;
859 	enum dma_desc_metadata_mode desc_metadata_modes;
860 	unsigned short max_xor;
861 	unsigned short max_pq;
862 	enum dmaengine_alignment copy_align;
863 	enum dmaengine_alignment xor_align;
864 	enum dmaengine_alignment pq_align;
865 	enum dmaengine_alignment fill_align;
866 	#define DMA_HAS_PQ_CONTINUE (1 << 15)
867 
868 	int dev_id;
869 	struct device *dev;
870 	struct module *owner;
871 	struct ida chan_ida;
872 
873 	u32 src_addr_widths;
874 	u32 dst_addr_widths;
875 	u32 directions;
876 	u32 min_burst;
877 	u32 max_burst;
878 	u32 max_sg_burst;
879 	bool descriptor_reuse;
880 	enum dma_residue_granularity residue_granularity;
881 
882 	int (*device_alloc_chan_resources)(struct dma_chan *chan);
883 	int (*device_router_config)(struct dma_chan *chan);
884 	void (*device_free_chan_resources)(struct dma_chan *chan);
885 
886 	struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)(
887 		struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
888 		size_t len, unsigned long flags);
889 	struct dma_async_tx_descriptor *(*device_prep_dma_xor)(
890 		struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
891 		unsigned int src_cnt, size_t len, unsigned long flags);
892 	struct dma_async_tx_descriptor *(*device_prep_dma_xor_val)(
893 		struct dma_chan *chan, dma_addr_t *src,	unsigned int src_cnt,
894 		size_t len, enum sum_check_flags *result, unsigned long flags);
895 	struct dma_async_tx_descriptor *(*device_prep_dma_pq)(
896 		struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
897 		unsigned int src_cnt, const unsigned char *scf,
898 		size_t len, unsigned long flags);
899 	struct dma_async_tx_descriptor *(*device_prep_dma_pq_val)(
900 		struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
901 		unsigned int src_cnt, const unsigned char *scf, size_t len,
902 		enum sum_check_flags *pqres, unsigned long flags);
903 	struct dma_async_tx_descriptor *(*device_prep_dma_memset)(
904 		struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
905 		unsigned long flags);
906 	struct dma_async_tx_descriptor *(*device_prep_dma_memset_sg)(
907 		struct dma_chan *chan, struct scatterlist *sg,
908 		unsigned int nents, int value, unsigned long flags);
909 	struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)(
910 		struct dma_chan *chan, unsigned long flags);
911 
912 	struct dma_async_tx_descriptor *(*device_prep_slave_sg)(
913 		struct dma_chan *chan, struct scatterlist *sgl,
914 		unsigned int sg_len, enum dma_transfer_direction direction,
915 		unsigned long flags, void *context);
916 	struct dma_async_tx_descriptor *(*device_prep_dma_cyclic)(
917 		struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
918 		size_t period_len, enum dma_transfer_direction direction,
919 		unsigned long flags);
920 	struct dma_async_tx_descriptor *(*device_prep_interleaved_dma)(
921 		struct dma_chan *chan, struct dma_interleaved_template *xt,
922 		unsigned long flags);
923 	struct dma_async_tx_descriptor *(*device_prep_dma_imm_data)(
924 		struct dma_chan *chan, dma_addr_t dst, u64 data,
925 		unsigned long flags);
926 
927 	void (*device_caps)(struct dma_chan *chan,
928 			    struct dma_slave_caps *caps);
929 	int (*device_config)(struct dma_chan *chan,
930 			     struct dma_slave_config *config);
931 	int (*device_pause)(struct dma_chan *chan);
932 	int (*device_resume)(struct dma_chan *chan);
933 	int (*device_terminate_all)(struct dma_chan *chan);
934 	void (*device_synchronize)(struct dma_chan *chan);
935 
936 	enum dma_status (*device_tx_status)(struct dma_chan *chan,
937 					    dma_cookie_t cookie,
938 					    struct dma_tx_state *txstate);
939 	void (*device_issue_pending)(struct dma_chan *chan);
940 	void (*device_release)(struct dma_device *dev);
941 	/* debugfs support */
942 	void (*dbg_summary_show)(struct seq_file *s, struct dma_device *dev);
943 	struct dentry *dbg_dev_root;
944 };
945 
dmaengine_slave_config(struct dma_chan * chan,struct dma_slave_config * config)946 static inline int dmaengine_slave_config(struct dma_chan *chan,
947 					  struct dma_slave_config *config)
948 {
949 	if (chan->device->device_config)
950 		return chan->device->device_config(chan, config);
951 
952 	return -ENOSYS;
953 }
954 
is_slave_direction(enum dma_transfer_direction direction)955 static inline bool is_slave_direction(enum dma_transfer_direction direction)
956 {
957 	return (direction == DMA_MEM_TO_DEV) || (direction == DMA_DEV_TO_MEM);
958 }
959 
dmaengine_prep_slave_single(struct dma_chan * chan,dma_addr_t buf,size_t len,enum dma_transfer_direction dir,unsigned long flags)960 static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
961 	struct dma_chan *chan, dma_addr_t buf, size_t len,
962 	enum dma_transfer_direction dir, unsigned long flags)
963 {
964 	struct scatterlist sg;
965 	sg_init_table(&sg, 1);
966 	sg_dma_address(&sg) = buf;
967 	sg_dma_len(&sg) = len;
968 
969 	if (!chan || !chan->device || !chan->device->device_prep_slave_sg)
970 		return NULL;
971 
972 	return chan->device->device_prep_slave_sg(chan, &sg, 1,
973 						  dir, flags, NULL);
974 }
975 
dmaengine_prep_slave_sg(struct dma_chan * chan,struct scatterlist * sgl,unsigned int sg_len,enum dma_transfer_direction dir,unsigned long flags)976 static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_sg(
977 	struct dma_chan *chan, struct scatterlist *sgl,	unsigned int sg_len,
978 	enum dma_transfer_direction dir, unsigned long flags)
979 {
980 	if (!chan || !chan->device || !chan->device->device_prep_slave_sg)
981 		return NULL;
982 
983 	return chan->device->device_prep_slave_sg(chan, sgl, sg_len,
984 						  dir, flags, NULL);
985 }
986 
987 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
988 struct rio_dma_ext;
dmaengine_prep_rio_sg(struct dma_chan * chan,struct scatterlist * sgl,unsigned int sg_len,enum dma_transfer_direction dir,unsigned long flags,struct rio_dma_ext * rio_ext)989 static inline struct dma_async_tx_descriptor *dmaengine_prep_rio_sg(
990 	struct dma_chan *chan, struct scatterlist *sgl,	unsigned int sg_len,
991 	enum dma_transfer_direction dir, unsigned long flags,
992 	struct rio_dma_ext *rio_ext)
993 {
994 	if (!chan || !chan->device || !chan->device->device_prep_slave_sg)
995 		return NULL;
996 
997 	return chan->device->device_prep_slave_sg(chan, sgl, sg_len,
998 						  dir, flags, rio_ext);
999 }
1000 #endif
1001 
dmaengine_prep_dma_cyclic(struct dma_chan * chan,dma_addr_t buf_addr,size_t buf_len,size_t period_len,enum dma_transfer_direction dir,unsigned long flags)1002 static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_cyclic(
1003 		struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
1004 		size_t period_len, enum dma_transfer_direction dir,
1005 		unsigned long flags)
1006 {
1007 	if (!chan || !chan->device || !chan->device->device_prep_dma_cyclic)
1008 		return NULL;
1009 
1010 	return chan->device->device_prep_dma_cyclic(chan, buf_addr, buf_len,
1011 						period_len, dir, flags);
1012 }
1013 
dmaengine_prep_interleaved_dma(struct dma_chan * chan,struct dma_interleaved_template * xt,unsigned long flags)1014 static inline struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma(
1015 		struct dma_chan *chan, struct dma_interleaved_template *xt,
1016 		unsigned long flags)
1017 {
1018 	if (!chan || !chan->device || !chan->device->device_prep_interleaved_dma)
1019 		return NULL;
1020 	if (flags & DMA_PREP_REPEAT &&
1021 	    !test_bit(DMA_REPEAT, chan->device->cap_mask.bits))
1022 		return NULL;
1023 
1024 	return chan->device->device_prep_interleaved_dma(chan, xt, flags);
1025 }
1026 
1027 /**
1028  * dmaengine_prep_dma_memset() - Prepare a DMA memset descriptor.
1029  * @chan: The channel to be used for this descriptor
1030  * @dest: Address of buffer to be set
1031  * @value: Treated as a single byte value that fills the destination buffer
1032  * @len: The total size of dest
1033  * @flags: DMA engine flags
1034  */
dmaengine_prep_dma_memset(struct dma_chan * chan,dma_addr_t dest,int value,size_t len,unsigned long flags)1035 static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_memset(
1036 		struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
1037 		unsigned long flags)
1038 {
1039 	if (!chan || !chan->device || !chan->device->device_prep_dma_memset)
1040 		return NULL;
1041 
1042 	return chan->device->device_prep_dma_memset(chan, dest, value,
1043 						    len, flags);
1044 }
1045 
dmaengine_prep_dma_memcpy(struct dma_chan * chan,dma_addr_t dest,dma_addr_t src,size_t len,unsigned long flags)1046 static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_memcpy(
1047 		struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1048 		size_t len, unsigned long flags)
1049 {
1050 	if (!chan || !chan->device || !chan->device->device_prep_dma_memcpy)
1051 		return NULL;
1052 
1053 	return chan->device->device_prep_dma_memcpy(chan, dest, src,
1054 						    len, flags);
1055 }
1056 
dmaengine_is_metadata_mode_supported(struct dma_chan * chan,enum dma_desc_metadata_mode mode)1057 static inline bool dmaengine_is_metadata_mode_supported(struct dma_chan *chan,
1058 		enum dma_desc_metadata_mode mode)
1059 {
1060 	if (!chan)
1061 		return false;
1062 
1063 	return !!(chan->device->desc_metadata_modes & mode);
1064 }
1065 
1066 #ifdef CONFIG_DMA_ENGINE
1067 int dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor *desc,
1068 				   void *data, size_t len);
1069 void *dmaengine_desc_get_metadata_ptr(struct dma_async_tx_descriptor *desc,
1070 				      size_t *payload_len, size_t *max_len);
1071 int dmaengine_desc_set_metadata_len(struct dma_async_tx_descriptor *desc,
1072 				    size_t payload_len);
1073 #else /* CONFIG_DMA_ENGINE */
dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor * desc,void * data,size_t len)1074 static inline int dmaengine_desc_attach_metadata(
1075 		struct dma_async_tx_descriptor *desc, void *data, size_t len)
1076 {
1077 	return -EINVAL;
1078 }
dmaengine_desc_get_metadata_ptr(struct dma_async_tx_descriptor * desc,size_t * payload_len,size_t * max_len)1079 static inline void *dmaengine_desc_get_metadata_ptr(
1080 		struct dma_async_tx_descriptor *desc, size_t *payload_len,
1081 		size_t *max_len)
1082 {
1083 	return NULL;
1084 }
dmaengine_desc_set_metadata_len(struct dma_async_tx_descriptor * desc,size_t payload_len)1085 static inline int dmaengine_desc_set_metadata_len(
1086 		struct dma_async_tx_descriptor *desc, size_t payload_len)
1087 {
1088 	return -EINVAL;
1089 }
1090 #endif /* CONFIG_DMA_ENGINE */
1091 
1092 /**
1093  * dmaengine_terminate_all() - Terminate all active DMA transfers
1094  * @chan: The channel for which to terminate the transfers
1095  *
1096  * This function is DEPRECATED use either dmaengine_terminate_sync() or
1097  * dmaengine_terminate_async() instead.
1098  */
dmaengine_terminate_all(struct dma_chan * chan)1099 static inline int dmaengine_terminate_all(struct dma_chan *chan)
1100 {
1101 	if (chan->device->device_terminate_all)
1102 		return chan->device->device_terminate_all(chan);
1103 
1104 	return -ENOSYS;
1105 }
1106 
1107 /**
1108  * dmaengine_terminate_async() - Terminate all active DMA transfers
1109  * @chan: The channel for which to terminate the transfers
1110  *
1111  * Calling this function will terminate all active and pending descriptors
1112  * that have previously been submitted to the channel. It is not guaranteed
1113  * though that the transfer for the active descriptor has stopped when the
1114  * function returns. Furthermore it is possible the complete callback of a
1115  * submitted transfer is still running when this function returns.
1116  *
1117  * dmaengine_synchronize() needs to be called before it is safe to free
1118  * any memory that is accessed by previously submitted descriptors or before
1119  * freeing any resources accessed from within the completion callback of any
1120  * previously submitted descriptors.
1121  *
1122  * This function can be called from atomic context as well as from within a
1123  * complete callback of a descriptor submitted on the same channel.
1124  *
1125  * If none of the two conditions above apply consider using
1126  * dmaengine_terminate_sync() instead.
1127  */
dmaengine_terminate_async(struct dma_chan * chan)1128 static inline int dmaengine_terminate_async(struct dma_chan *chan)
1129 {
1130 	if (chan->device->device_terminate_all)
1131 		return chan->device->device_terminate_all(chan);
1132 
1133 	return -EINVAL;
1134 }
1135 
1136 /**
1137  * dmaengine_synchronize() - Synchronize DMA channel termination
1138  * @chan: The channel to synchronize
1139  *
1140  * Synchronizes to the DMA channel termination to the current context. When this
1141  * function returns it is guaranteed that all transfers for previously issued
1142  * descriptors have stopped and it is safe to free the memory associated
1143  * with them. Furthermore it is guaranteed that all complete callback functions
1144  * for a previously submitted descriptor have finished running and it is safe to
1145  * free resources accessed from within the complete callbacks.
1146  *
1147  * The behavior of this function is undefined if dma_async_issue_pending() has
1148  * been called between dmaengine_terminate_async() and this function.
1149  *
1150  * This function must only be called from non-atomic context and must not be
1151  * called from within a complete callback of a descriptor submitted on the same
1152  * channel.
1153  */
dmaengine_synchronize(struct dma_chan * chan)1154 static inline void dmaengine_synchronize(struct dma_chan *chan)
1155 {
1156 	might_sleep();
1157 
1158 	if (chan->device->device_synchronize)
1159 		chan->device->device_synchronize(chan);
1160 }
1161 
1162 /**
1163  * dmaengine_terminate_sync() - Terminate all active DMA transfers
1164  * @chan: The channel for which to terminate the transfers
1165  *
1166  * Calling this function will terminate all active and pending transfers
1167  * that have previously been submitted to the channel. It is similar to
1168  * dmaengine_terminate_async() but guarantees that the DMA transfer has actually
1169  * stopped and that all complete callbacks have finished running when the
1170  * function returns.
1171  *
1172  * This function must only be called from non-atomic context and must not be
1173  * called from within a complete callback of a descriptor submitted on the same
1174  * channel.
1175  */
dmaengine_terminate_sync(struct dma_chan * chan)1176 static inline int dmaengine_terminate_sync(struct dma_chan *chan)
1177 {
1178 	int ret;
1179 
1180 	ret = dmaengine_terminate_async(chan);
1181 	if (ret)
1182 		return ret;
1183 
1184 	dmaengine_synchronize(chan);
1185 
1186 	return 0;
1187 }
1188 
dmaengine_pause(struct dma_chan * chan)1189 static inline int dmaengine_pause(struct dma_chan *chan)
1190 {
1191 	if (chan->device->device_pause)
1192 		return chan->device->device_pause(chan);
1193 
1194 	return -ENOSYS;
1195 }
1196 
dmaengine_resume(struct dma_chan * chan)1197 static inline int dmaengine_resume(struct dma_chan *chan)
1198 {
1199 	if (chan->device->device_resume)
1200 		return chan->device->device_resume(chan);
1201 
1202 	return -ENOSYS;
1203 }
1204 
dmaengine_tx_status(struct dma_chan * chan,dma_cookie_t cookie,struct dma_tx_state * state)1205 static inline enum dma_status dmaengine_tx_status(struct dma_chan *chan,
1206 	dma_cookie_t cookie, struct dma_tx_state *state)
1207 {
1208 	return chan->device->device_tx_status(chan, cookie, state);
1209 }
1210 
dmaengine_submit(struct dma_async_tx_descriptor * desc)1211 static inline dma_cookie_t dmaengine_submit(struct dma_async_tx_descriptor *desc)
1212 {
1213 	return desc->tx_submit(desc);
1214 }
1215 
dmaengine_check_align(enum dmaengine_alignment align,size_t off1,size_t off2,size_t len)1216 static inline bool dmaengine_check_align(enum dmaengine_alignment align,
1217 					 size_t off1, size_t off2, size_t len)
1218 {
1219 	return !(((1 << align) - 1) & (off1 | off2 | len));
1220 }
1221 
is_dma_copy_aligned(struct dma_device * dev,size_t off1,size_t off2,size_t len)1222 static inline bool is_dma_copy_aligned(struct dma_device *dev, size_t off1,
1223 				       size_t off2, size_t len)
1224 {
1225 	return dmaengine_check_align(dev->copy_align, off1, off2, len);
1226 }
1227 
is_dma_xor_aligned(struct dma_device * dev,size_t off1,size_t off2,size_t len)1228 static inline bool is_dma_xor_aligned(struct dma_device *dev, size_t off1,
1229 				      size_t off2, size_t len)
1230 {
1231 	return dmaengine_check_align(dev->xor_align, off1, off2, len);
1232 }
1233 
is_dma_pq_aligned(struct dma_device * dev,size_t off1,size_t off2,size_t len)1234 static inline bool is_dma_pq_aligned(struct dma_device *dev, size_t off1,
1235 				     size_t off2, size_t len)
1236 {
1237 	return dmaengine_check_align(dev->pq_align, off1, off2, len);
1238 }
1239 
is_dma_fill_aligned(struct dma_device * dev,size_t off1,size_t off2,size_t len)1240 static inline bool is_dma_fill_aligned(struct dma_device *dev, size_t off1,
1241 				       size_t off2, size_t len)
1242 {
1243 	return dmaengine_check_align(dev->fill_align, off1, off2, len);
1244 }
1245 
1246 static inline void
dma_set_maxpq(struct dma_device * dma,int maxpq,int has_pq_continue)1247 dma_set_maxpq(struct dma_device *dma, int maxpq, int has_pq_continue)
1248 {
1249 	dma->max_pq = maxpq;
1250 	if (has_pq_continue)
1251 		dma->max_pq |= DMA_HAS_PQ_CONTINUE;
1252 }
1253 
dmaf_continue(enum dma_ctrl_flags flags)1254 static inline bool dmaf_continue(enum dma_ctrl_flags flags)
1255 {
1256 	return (flags & DMA_PREP_CONTINUE) == DMA_PREP_CONTINUE;
1257 }
1258 
dmaf_p_disabled_continue(enum dma_ctrl_flags flags)1259 static inline bool dmaf_p_disabled_continue(enum dma_ctrl_flags flags)
1260 {
1261 	enum dma_ctrl_flags mask = DMA_PREP_CONTINUE | DMA_PREP_PQ_DISABLE_P;
1262 
1263 	return (flags & mask) == mask;
1264 }
1265 
dma_dev_has_pq_continue(struct dma_device * dma)1266 static inline bool dma_dev_has_pq_continue(struct dma_device *dma)
1267 {
1268 	return (dma->max_pq & DMA_HAS_PQ_CONTINUE) == DMA_HAS_PQ_CONTINUE;
1269 }
1270 
dma_dev_to_maxpq(struct dma_device * dma)1271 static inline unsigned short dma_dev_to_maxpq(struct dma_device *dma)
1272 {
1273 	return dma->max_pq & ~DMA_HAS_PQ_CONTINUE;
1274 }
1275 
1276 /* dma_maxpq - reduce maxpq in the face of continued operations
1277  * @dma - dma device with PQ capability
1278  * @flags - to check if DMA_PREP_CONTINUE and DMA_PREP_PQ_DISABLE_P are set
1279  *
1280  * When an engine does not support native continuation we need 3 extra
1281  * source slots to reuse P and Q with the following coefficients:
1282  * 1/ {00} * P : remove P from Q', but use it as a source for P'
1283  * 2/ {01} * Q : use Q to continue Q' calculation
1284  * 3/ {00} * Q : subtract Q from P' to cancel (2)
1285  *
1286  * In the case where P is disabled we only need 1 extra source:
1287  * 1/ {01} * Q : use Q to continue Q' calculation
1288  */
dma_maxpq(struct dma_device * dma,enum dma_ctrl_flags flags)1289 static inline int dma_maxpq(struct dma_device *dma, enum dma_ctrl_flags flags)
1290 {
1291 	if (dma_dev_has_pq_continue(dma) || !dmaf_continue(flags))
1292 		return dma_dev_to_maxpq(dma);
1293 	if (dmaf_p_disabled_continue(flags))
1294 		return dma_dev_to_maxpq(dma) - 1;
1295 	if (dmaf_continue(flags))
1296 		return dma_dev_to_maxpq(dma) - 3;
1297 	BUG();
1298 }
1299 
dmaengine_get_icg(bool inc,bool sgl,size_t icg,size_t dir_icg)1300 static inline size_t dmaengine_get_icg(bool inc, bool sgl, size_t icg,
1301 				      size_t dir_icg)
1302 {
1303 	if (inc) {
1304 		if (dir_icg)
1305 			return dir_icg;
1306 		if (sgl)
1307 			return icg;
1308 	}
1309 
1310 	return 0;
1311 }
1312 
dmaengine_get_dst_icg(struct dma_interleaved_template * xt,struct data_chunk * chunk)1313 static inline size_t dmaengine_get_dst_icg(struct dma_interleaved_template *xt,
1314 					   struct data_chunk *chunk)
1315 {
1316 	return dmaengine_get_icg(xt->dst_inc, xt->dst_sgl,
1317 				 chunk->icg, chunk->dst_icg);
1318 }
1319 
dmaengine_get_src_icg(struct dma_interleaved_template * xt,struct data_chunk * chunk)1320 static inline size_t dmaengine_get_src_icg(struct dma_interleaved_template *xt,
1321 					   struct data_chunk *chunk)
1322 {
1323 	return dmaengine_get_icg(xt->src_inc, xt->src_sgl,
1324 				 chunk->icg, chunk->src_icg);
1325 }
1326 
1327 /* --- public DMA engine API --- */
1328 
1329 #ifdef CONFIG_DMA_ENGINE
1330 void dmaengine_get(void);
1331 void dmaengine_put(void);
1332 #else
dmaengine_get(void)1333 static inline void dmaengine_get(void)
1334 {
1335 }
dmaengine_put(void)1336 static inline void dmaengine_put(void)
1337 {
1338 }
1339 #endif
1340 
1341 #ifdef CONFIG_ASYNC_TX_DMA
1342 #define async_dmaengine_get()	dmaengine_get()
1343 #define async_dmaengine_put()	dmaengine_put()
1344 #ifndef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH
1345 #define async_dma_find_channel(type) dma_find_channel(DMA_ASYNC_TX)
1346 #else
1347 #define async_dma_find_channel(type) dma_find_channel(type)
1348 #endif /* CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH */
1349 #else
async_dmaengine_get(void)1350 static inline void async_dmaengine_get(void)
1351 {
1352 }
async_dmaengine_put(void)1353 static inline void async_dmaengine_put(void)
1354 {
1355 }
1356 static inline struct dma_chan *
async_dma_find_channel(enum dma_transaction_type type)1357 async_dma_find_channel(enum dma_transaction_type type)
1358 {
1359 	return NULL;
1360 }
1361 #endif /* CONFIG_ASYNC_TX_DMA */
1362 void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
1363 				  struct dma_chan *chan);
1364 
async_tx_ack(struct dma_async_tx_descriptor * tx)1365 static inline void async_tx_ack(struct dma_async_tx_descriptor *tx)
1366 {
1367 	tx->flags |= DMA_CTRL_ACK;
1368 }
1369 
async_tx_clear_ack(struct dma_async_tx_descriptor * tx)1370 static inline void async_tx_clear_ack(struct dma_async_tx_descriptor *tx)
1371 {
1372 	tx->flags &= ~DMA_CTRL_ACK;
1373 }
1374 
async_tx_test_ack(struct dma_async_tx_descriptor * tx)1375 static inline bool async_tx_test_ack(struct dma_async_tx_descriptor *tx)
1376 {
1377 	return (tx->flags & DMA_CTRL_ACK) == DMA_CTRL_ACK;
1378 }
1379 
1380 #define dma_cap_set(tx, mask) __dma_cap_set((tx), &(mask))
1381 static inline void
__dma_cap_set(enum dma_transaction_type tx_type,dma_cap_mask_t * dstp)1382 __dma_cap_set(enum dma_transaction_type tx_type, dma_cap_mask_t *dstp)
1383 {
1384 	set_bit(tx_type, dstp->bits);
1385 }
1386 
1387 #define dma_cap_clear(tx, mask) __dma_cap_clear((tx), &(mask))
1388 static inline void
__dma_cap_clear(enum dma_transaction_type tx_type,dma_cap_mask_t * dstp)1389 __dma_cap_clear(enum dma_transaction_type tx_type, dma_cap_mask_t *dstp)
1390 {
1391 	clear_bit(tx_type, dstp->bits);
1392 }
1393 
1394 #define dma_cap_zero(mask) __dma_cap_zero(&(mask))
__dma_cap_zero(dma_cap_mask_t * dstp)1395 static inline void __dma_cap_zero(dma_cap_mask_t *dstp)
1396 {
1397 	bitmap_zero(dstp->bits, DMA_TX_TYPE_END);
1398 }
1399 
1400 #define dma_has_cap(tx, mask) __dma_has_cap((tx), &(mask))
1401 static inline int
__dma_has_cap(enum dma_transaction_type tx_type,dma_cap_mask_t * srcp)1402 __dma_has_cap(enum dma_transaction_type tx_type, dma_cap_mask_t *srcp)
1403 {
1404 	return test_bit(tx_type, srcp->bits);
1405 }
1406 
1407 #define for_each_dma_cap_mask(cap, mask) \
1408 	for_each_set_bit(cap, mask.bits, DMA_TX_TYPE_END)
1409 
1410 /**
1411  * dma_async_issue_pending - flush pending transactions to HW
1412  * @chan: target DMA channel
1413  *
1414  * This allows drivers to push copies to HW in batches,
1415  * reducing MMIO writes where possible.
1416  */
dma_async_issue_pending(struct dma_chan * chan)1417 static inline void dma_async_issue_pending(struct dma_chan *chan)
1418 {
1419 	chan->device->device_issue_pending(chan);
1420 }
1421 
1422 /**
1423  * dma_async_is_tx_complete - poll for transaction completion
1424  * @chan: DMA channel
1425  * @cookie: transaction identifier to check status of
1426  * @last: returns last completed cookie, can be NULL
1427  * @used: returns last issued cookie, can be NULL
1428  *
1429  * If @last and @used are passed in, upon return they reflect the driver
1430  * internal state and can be used with dma_async_is_complete() to check
1431  * the status of multiple cookies without re-checking hardware state.
1432  */
dma_async_is_tx_complete(struct dma_chan * chan,dma_cookie_t cookie,dma_cookie_t * last,dma_cookie_t * used)1433 static inline enum dma_status dma_async_is_tx_complete(struct dma_chan *chan,
1434 	dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used)
1435 {
1436 	struct dma_tx_state state;
1437 	enum dma_status status;
1438 
1439 	status = chan->device->device_tx_status(chan, cookie, &state);
1440 	if (last)
1441 		*last = state.last;
1442 	if (used)
1443 		*used = state.used;
1444 	return status;
1445 }
1446 
1447 /**
1448  * dma_async_is_complete - test a cookie against chan state
1449  * @cookie: transaction identifier to test status of
1450  * @last_complete: last know completed transaction
1451  * @last_used: last cookie value handed out
1452  *
1453  * dma_async_is_complete() is used in dma_async_is_tx_complete()
1454  * the test logic is separated for lightweight testing of multiple cookies
1455  */
dma_async_is_complete(dma_cookie_t cookie,dma_cookie_t last_complete,dma_cookie_t last_used)1456 static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie,
1457 			dma_cookie_t last_complete, dma_cookie_t last_used)
1458 {
1459 	if (last_complete <= last_used) {
1460 		if ((cookie <= last_complete) || (cookie > last_used))
1461 			return DMA_COMPLETE;
1462 	} else {
1463 		if ((cookie <= last_complete) && (cookie > last_used))
1464 			return DMA_COMPLETE;
1465 	}
1466 	return DMA_IN_PROGRESS;
1467 }
1468 
1469 static inline void
dma_set_tx_state(struct dma_tx_state * st,dma_cookie_t last,dma_cookie_t used,u32 residue)1470 dma_set_tx_state(struct dma_tx_state *st, dma_cookie_t last, dma_cookie_t used, u32 residue)
1471 {
1472 	if (!st)
1473 		return;
1474 
1475 	st->last = last;
1476 	st->used = used;
1477 	st->residue = residue;
1478 }
1479 
1480 #ifdef CONFIG_DMA_ENGINE
1481 struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type);
1482 enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie);
1483 enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
1484 void dma_issue_pending_all(void);
1485 struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
1486 				       dma_filter_fn fn, void *fn_param,
1487 				       struct device_node *np);
1488 
1489 struct dma_chan *dma_request_chan(struct device *dev, const char *name);
1490 struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask);
1491 
1492 void dma_release_channel(struct dma_chan *chan);
1493 int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps);
1494 #else
dma_find_channel(enum dma_transaction_type tx_type)1495 static inline struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type)
1496 {
1497 	return NULL;
1498 }
dma_sync_wait(struct dma_chan * chan,dma_cookie_t cookie)1499 static inline enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
1500 {
1501 	return DMA_COMPLETE;
1502 }
dma_wait_for_async_tx(struct dma_async_tx_descriptor * tx)1503 static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
1504 {
1505 	return DMA_COMPLETE;
1506 }
dma_issue_pending_all(void)1507 static inline void dma_issue_pending_all(void)
1508 {
1509 }
__dma_request_channel(const dma_cap_mask_t * mask,dma_filter_fn fn,void * fn_param,struct device_node * np)1510 static inline struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask,
1511 						     dma_filter_fn fn,
1512 						     void *fn_param,
1513 						     struct device_node *np)
1514 {
1515 	return NULL;
1516 }
dma_request_chan(struct device * dev,const char * name)1517 static inline struct dma_chan *dma_request_chan(struct device *dev,
1518 						const char *name)
1519 {
1520 	return ERR_PTR(-ENODEV);
1521 }
dma_request_chan_by_mask(const dma_cap_mask_t * mask)1522 static inline struct dma_chan *dma_request_chan_by_mask(
1523 						const dma_cap_mask_t *mask)
1524 {
1525 	return ERR_PTR(-ENODEV);
1526 }
dma_release_channel(struct dma_chan * chan)1527 static inline void dma_release_channel(struct dma_chan *chan)
1528 {
1529 }
dma_get_slave_caps(struct dma_chan * chan,struct dma_slave_caps * caps)1530 static inline int dma_get_slave_caps(struct dma_chan *chan,
1531 				     struct dma_slave_caps *caps)
1532 {
1533 	return -ENXIO;
1534 }
1535 #endif
1536 
dmaengine_desc_set_reuse(struct dma_async_tx_descriptor * tx)1537 static inline int dmaengine_desc_set_reuse(struct dma_async_tx_descriptor *tx)
1538 {
1539 	struct dma_slave_caps caps;
1540 	int ret;
1541 
1542 	ret = dma_get_slave_caps(tx->chan, &caps);
1543 	if (ret)
1544 		return ret;
1545 
1546 	if (!caps.descriptor_reuse)
1547 		return -EPERM;
1548 
1549 	tx->flags |= DMA_CTRL_REUSE;
1550 	return 0;
1551 }
1552 
dmaengine_desc_clear_reuse(struct dma_async_tx_descriptor * tx)1553 static inline void dmaengine_desc_clear_reuse(struct dma_async_tx_descriptor *tx)
1554 {
1555 	tx->flags &= ~DMA_CTRL_REUSE;
1556 }
1557 
dmaengine_desc_test_reuse(struct dma_async_tx_descriptor * tx)1558 static inline bool dmaengine_desc_test_reuse(struct dma_async_tx_descriptor *tx)
1559 {
1560 	return (tx->flags & DMA_CTRL_REUSE) == DMA_CTRL_REUSE;
1561 }
1562 
dmaengine_desc_free(struct dma_async_tx_descriptor * desc)1563 static inline int dmaengine_desc_free(struct dma_async_tx_descriptor *desc)
1564 {
1565 	/* this is supported for reusable desc, so check that */
1566 	if (!dmaengine_desc_test_reuse(desc))
1567 		return -EPERM;
1568 
1569 	return desc->desc_free(desc);
1570 }
1571 
1572 /* --- DMA device --- */
1573 
1574 int dma_async_device_register(struct dma_device *device);
1575 int dmaenginem_async_device_register(struct dma_device *device);
1576 void dma_async_device_unregister(struct dma_device *device);
1577 int dma_async_device_channel_register(struct dma_device *device,
1578 				      struct dma_chan *chan);
1579 void dma_async_device_channel_unregister(struct dma_device *device,
1580 					 struct dma_chan *chan);
1581 void dma_run_dependencies(struct dma_async_tx_descriptor *tx);
1582 #define dma_request_channel(mask, x, y) \
1583 	__dma_request_channel(&(mask), x, y, NULL)
1584 
1585 /* Deprecated, please use dma_request_chan() directly */
1586 static inline struct dma_chan * __deprecated
dma_request_slave_channel(struct device * dev,const char * name)1587 dma_request_slave_channel(struct device *dev, const char *name)
1588 {
1589 	struct dma_chan *ch = dma_request_chan(dev, name);
1590 
1591 	return IS_ERR(ch) ? NULL : ch;
1592 }
1593 
1594 static inline struct dma_chan
dma_request_slave_channel_compat(const dma_cap_mask_t mask,dma_filter_fn fn,void * fn_param,struct device * dev,const char * name)1595 *dma_request_slave_channel_compat(const dma_cap_mask_t mask,
1596 				  dma_filter_fn fn, void *fn_param,
1597 				  struct device *dev, const char *name)
1598 {
1599 	struct dma_chan *chan;
1600 
1601 	chan = dma_request_slave_channel(dev, name);
1602 	if (chan)
1603 		return chan;
1604 
1605 	if (!fn || !fn_param)
1606 		return NULL;
1607 
1608 	return __dma_request_channel(&mask, fn, fn_param, NULL);
1609 }
1610 
1611 static inline char *
dmaengine_get_direction_text(enum dma_transfer_direction dir)1612 dmaengine_get_direction_text(enum dma_transfer_direction dir)
1613 {
1614 	switch (dir) {
1615 	case DMA_DEV_TO_MEM:
1616 		return "DEV_TO_MEM";
1617 	case DMA_MEM_TO_DEV:
1618 		return "MEM_TO_DEV";
1619 	case DMA_MEM_TO_MEM:
1620 		return "MEM_TO_MEM";
1621 	case DMA_DEV_TO_DEV:
1622 		return "DEV_TO_DEV";
1623 	default:
1624 		return "invalid";
1625 	}
1626 }
1627 
dmaengine_get_dma_device(struct dma_chan * chan)1628 static inline struct device *dmaengine_get_dma_device(struct dma_chan *chan)
1629 {
1630 	if (chan->dev->chan_dma_dev)
1631 		return &chan->dev->device;
1632 
1633 	return chan->device->dev;
1634 }
1635 
1636 #endif /* DMAENGINE_H */
1637