1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * Common SPI Interface: Controller-specific definitions
4 *
5 * (C) Copyright 2001
6 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
7 */
8
9 #ifndef _SPI_H_
10 #define _SPI_H_
11
12 #include <common.h>
13
14 /* SPI mode flags */
15 #define SPI_CPHA BIT(0) /* clock phase */
16 #define SPI_CPOL BIT(1) /* clock polarity */
17 #define SPI_MODE_0 (0|0) /* (original MicroWire) */
18 #define SPI_MODE_1 (0|SPI_CPHA)
19 #define SPI_MODE_2 (SPI_CPOL|0)
20 #define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
21 #define SPI_CS_HIGH BIT(2) /* CS active high */
22 #define SPI_LSB_FIRST BIT(3) /* per-word bits-on-wire */
23 #define SPI_3WIRE BIT(4) /* SI/SO signals shared */
24 #define SPI_LOOP BIT(5) /* loopback mode */
25 #define SPI_SLAVE BIT(6) /* slave mode */
26 #define SPI_PREAMBLE BIT(7) /* Skip preamble bytes */
27 #define SPI_TX_BYTE BIT(8) /* transmit with 1 wire byte */
28 #define SPI_TX_DUAL BIT(9) /* transmit with 2 wires */
29 #define SPI_TX_QUAD BIT(10) /* transmit with 4 wires */
30 #define SPI_RX_SLOW BIT(11) /* receive with 1 wire slow */
31 #define SPI_RX_DUAL BIT(12) /* receive with 2 wires */
32 #define SPI_RX_QUAD BIT(13) /* receive with 4 wires */
33
34 /* Header byte that marks the start of the message */
35 #define SPI_PREAMBLE_END_BYTE 0xec
36
37 #define SPI_DEFAULT_WORDLEN 8
38
39 #ifdef CONFIG_DM_SPI
40 /* TODO(sjg@chromium.org): Remove this and use max_hz from struct spi_slave */
41 struct dm_spi_bus {
42 uint max_hz;
43 };
44
45 /**
46 * struct dm_spi_platdata - platform data for all SPI slaves
47 *
48 * This describes a SPI slave, a child device of the SPI bus. To obtain this
49 * struct from a spi_slave, use dev_get_parent_platdata(dev) or
50 * dev_get_parent_platdata(slave->dev).
51 *
52 * This data is immuatable. Each time the device is probed, @max_hz and @mode
53 * will be copied to struct spi_slave.
54 *
55 * @cs: Chip select number (0..n-1)
56 * @max_hz: Maximum bus speed that this slave can tolerate
57 * @mode: SPI mode to use for this device (see SPI mode flags)
58 */
59 struct dm_spi_slave_platdata {
60 unsigned int cs;
61 uint max_hz;
62 uint mode;
63 };
64
65 #endif /* CONFIG_DM_SPI */
66
67 /**
68 * struct spi_slave - Representation of a SPI slave
69 *
70 * For driver model this is the per-child data used by the SPI bus. It can
71 * be accessed using dev_get_parent_priv() on the slave device. The SPI uclass
72 * sets uip per_child_auto_alloc_size to sizeof(struct spi_slave), and the
73 * driver should not override it. Two platform data fields (max_hz and mode)
74 * are copied into this structure to provide an initial value. This allows
75 * them to be changed, since we should never change platform data in drivers.
76 *
77 * If not using driver model, drivers are expected to extend this with
78 * controller-specific data.
79 *
80 * @dev: SPI slave device
81 * @max_hz: Maximum speed for this slave
82 * @speed: Current bus speed. This is 0 until the bus is first
83 * claimed.
84 * @bus: ID of the bus that the slave is attached to. For
85 * driver model this is the sequence number of the SPI
86 * bus (bus->seq) so does not need to be stored
87 * @cs: ID of the chip select connected to the slave.
88 * @mode: SPI mode to use for this slave (see SPI mode flags)
89 * @wordlen: Size of SPI word in number of bits
90 * @max_read_size: If non-zero, the maximum number of bytes which can
91 * be read at once.
92 * @max_write_size: If non-zero, the maximum number of bytes which can
93 * be written at once.
94 * @memory_map: Address of read-only SPI flash access.
95 * @flags: Indication of SPI flags.
96 */
97 struct spi_slave {
98 #ifdef CONFIG_DM_SPI
99 struct udevice *dev; /* struct spi_slave is dev->parentdata */
100 uint max_hz;
101 uint speed;
102 #else
103 unsigned int bus;
104 unsigned int cs;
105 #endif
106 uint mode;
107 unsigned int wordlen;
108 unsigned int max_read_size;
109 unsigned int max_write_size;
110 void *memory_map;
111
112 u8 flags;
113 #define SPI_XFER_BEGIN BIT(0) /* Assert CS before transfer */
114 #define SPI_XFER_END BIT(1) /* Deassert CS after transfer */
115 #define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END)
116 #define SPI_XFER_MMAP BIT(2) /* Memory Mapped start */
117 #define SPI_XFER_MMAP_END BIT(3) /* Memory Mapped End */
118 };
119
120 /**
121 * spi_do_alloc_slave - Allocate a new SPI slave (internal)
122 *
123 * Allocate and zero all fields in the spi slave, and set the bus/chip
124 * select. Use the helper macro spi_alloc_slave() to call this.
125 *
126 * @offset: Offset of struct spi_slave within slave structure.
127 * @size: Size of slave structure.
128 * @bus: Bus ID of the slave chip.
129 * @cs: Chip select ID of the slave chip on the specified bus.
130 */
131 void *spi_do_alloc_slave(int offset, int size, unsigned int bus,
132 unsigned int cs);
133
134 /**
135 * spi_alloc_slave - Allocate a new SPI slave
136 *
137 * Allocate and zero all fields in the spi slave, and set the bus/chip
138 * select.
139 *
140 * @_struct: Name of structure to allocate (e.g. struct tegra_spi).
141 * This structure must contain a member 'struct spi_slave *slave'.
142 * @bus: Bus ID of the slave chip.
143 * @cs: Chip select ID of the slave chip on the specified bus.
144 */
145 #define spi_alloc_slave(_struct, bus, cs) \
146 spi_do_alloc_slave(offsetof(_struct, slave), \
147 sizeof(_struct), bus, cs)
148
149 /**
150 * spi_alloc_slave_base - Allocate a new SPI slave with no private data
151 *
152 * Allocate and zero all fields in the spi slave, and set the bus/chip
153 * select.
154 *
155 * @bus: Bus ID of the slave chip.
156 * @cs: Chip select ID of the slave chip on the specified bus.
157 */
158 #define spi_alloc_slave_base(bus, cs) \
159 spi_do_alloc_slave(0, sizeof(struct spi_slave), bus, cs)
160
161 /**
162 * Set up communications parameters for a SPI slave.
163 *
164 * This must be called once for each slave. Note that this function
165 * usually doesn't touch any actual hardware, it only initializes the
166 * contents of spi_slave so that the hardware can be easily
167 * initialized later.
168 *
169 * @bus: Bus ID of the slave chip.
170 * @cs: Chip select ID of the slave chip on the specified bus.
171 * @max_hz: Maximum SCK rate in Hz.
172 * @mode: Clock polarity, clock phase and other parameters.
173 *
174 * Returns: A spi_slave reference that can be used in subsequent SPI
175 * calls, or NULL if one or more of the parameters are not supported.
176 */
177 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
178 unsigned int max_hz, unsigned int mode);
179
180 /**
181 * Free any memory associated with a SPI slave.
182 *
183 * @slave: The SPI slave
184 */
185 void spi_free_slave(struct spi_slave *slave);
186
187 /**
188 * Claim the bus and prepare it for communication with a given slave.
189 *
190 * This must be called before doing any transfers with a SPI slave. It
191 * will enable and initialize any SPI hardware as necessary, and make
192 * sure that the SCK line is in the correct idle state. It is not
193 * allowed to claim the same bus for several slaves without releasing
194 * the bus in between.
195 *
196 * @slave: The SPI slave
197 *
198 * Returns: 0 if the bus was claimed successfully, or a negative value
199 * if it wasn't.
200 */
201 int spi_claim_bus(struct spi_slave *slave);
202
203 /**
204 * Release the SPI bus
205 *
206 * This must be called once for every call to spi_claim_bus() after
207 * all transfers have finished. It may disable any SPI hardware as
208 * appropriate.
209 *
210 * @slave: The SPI slave
211 */
212 void spi_release_bus(struct spi_slave *slave);
213
214 /**
215 * Set the word length for SPI transactions
216 *
217 * Set the word length (number of bits per word) for SPI transactions.
218 *
219 * @slave: The SPI slave
220 * @wordlen: The number of bits in a word
221 *
222 * Returns: 0 on success, -1 on failure.
223 */
224 int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
225
226 /**
227 * SPI transfer
228 *
229 * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
230 * "bitlen" bits in the SPI MISO port. That's just the way SPI works.
231 *
232 * The source of the outgoing bits is the "dout" parameter and the
233 * destination of the input bits is the "din" parameter. Note that "dout"
234 * and "din" can point to the same memory location, in which case the
235 * input data overwrites the output data (since both are buffered by
236 * temporary variables, this is OK).
237 *
238 * spi_xfer() interface:
239 * @slave: The SPI slave which will be sending/receiving the data.
240 * @bitlen: How many bits to write and read.
241 * @dout: Pointer to a string of bits to send out. The bits are
242 * held in a byte array and are sent MSB first.
243 * @din: Pointer to a string of bits that will be filled in.
244 * @flags: A bitwise combination of SPI_XFER_* flags.
245 *
246 * Returns: 0 on success, not 0 on failure
247 */
248 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
249 void *din, unsigned long flags);
250
251 /**
252 * spi_write_then_read - SPI synchronous write followed by read
253 *
254 * This performs a half duplex transaction in which the first transaction
255 * is to send the opcode and if the length of buf is non-zero then it start
256 * the second transaction as tx or rx based on the need from respective slave.
257 *
258 * @slave: The SPI slave device with which opcode/data will be exchanged
259 * @opcode: opcode used for specific transfer
260 * @n_opcode: size of opcode, in bytes
261 * @txbuf: buffer into which data to be written
262 * @rxbuf: buffer into which data will be read
263 * @n_buf: size of buf (whether it's [tx|rx]buf), in bytes
264 *
265 * Returns: 0 on success, not 0 on failure
266 */
267 int spi_write_then_read(struct spi_slave *slave, const u8 *opcode,
268 size_t n_opcode, const u8 *txbuf, u8 *rxbuf,
269 size_t n_buf);
270
271 /* Copy memory mapped data */
272 void spi_flash_copy_mmap(void *data, void *offset, size_t len);
273
274 /**
275 * Determine if a SPI chipselect is valid.
276 * This function is provided by the board if the low-level SPI driver
277 * needs it to determine if a given chipselect is actually valid.
278 *
279 * Returns: 1 if bus:cs identifies a valid chip on this board, 0
280 * otherwise.
281 */
282 int spi_cs_is_valid(unsigned int bus, unsigned int cs);
283
284 #ifndef CONFIG_DM_SPI
285 /**
286 * Activate a SPI chipselect.
287 * This function is provided by the board code when using a driver
288 * that can't control its chipselects automatically (e.g.
289 * common/soft_spi.c). When called, it should activate the chip select
290 * to the device identified by "slave".
291 */
292 void spi_cs_activate(struct spi_slave *slave);
293
294 /**
295 * Deactivate a SPI chipselect.
296 * This function is provided by the board code when using a driver
297 * that can't control its chipselects automatically (e.g.
298 * common/soft_spi.c). When called, it should deactivate the chip
299 * select to the device identified by "slave".
300 */
301 void spi_cs_deactivate(struct spi_slave *slave);
302
303 /**
304 * Set transfer speed.
305 * This sets a new speed to be applied for next spi_xfer().
306 * @slave: The SPI slave
307 * @hz: The transfer speed
308 */
309 void spi_set_speed(struct spi_slave *slave, uint hz);
310 #endif
311
312 /**
313 * Write 8 bits, then read 8 bits.
314 * @slave: The SPI slave we're communicating with
315 * @byte: Byte to be written
316 *
317 * Returns: The value that was read, or a negative value on error.
318 *
319 * TODO: This function probably shouldn't be inlined.
320 */
spi_w8r8(struct spi_slave * slave,unsigned char byte)321 static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte)
322 {
323 unsigned char dout[2];
324 unsigned char din[2];
325 int ret;
326
327 dout[0] = byte;
328 dout[1] = 0;
329
330 ret = spi_xfer(slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END);
331 return ret < 0 ? ret : din[1];
332 }
333
334 #ifdef CONFIG_DM_SPI
335
336 /**
337 * struct spi_cs_info - Information about a bus chip select
338 *
339 * @dev: Connected device, or NULL if none
340 */
341 struct spi_cs_info {
342 struct udevice *dev;
343 };
344
345 /**
346 * struct struct dm_spi_ops - Driver model SPI operations
347 *
348 * The uclass interface is implemented by all SPI devices which use
349 * driver model.
350 */
351 struct dm_spi_ops {
352 /**
353 * Claim the bus and prepare it for communication.
354 *
355 * The device provided is the slave device. It's parent controller
356 * will be used to provide the communication.
357 *
358 * This must be called before doing any transfers with a SPI slave. It
359 * will enable and initialize any SPI hardware as necessary, and make
360 * sure that the SCK line is in the correct idle state. It is not
361 * allowed to claim the same bus for several slaves without releasing
362 * the bus in between.
363 *
364 * @dev: The SPI slave
365 *
366 * Returns: 0 if the bus was claimed successfully, or a negative value
367 * if it wasn't.
368 */
369 int (*claim_bus)(struct udevice *dev);
370
371 /**
372 * Release the SPI bus
373 *
374 * This must be called once for every call to spi_claim_bus() after
375 * all transfers have finished. It may disable any SPI hardware as
376 * appropriate.
377 *
378 * @dev: The SPI slave
379 */
380 int (*release_bus)(struct udevice *dev);
381
382 /**
383 * Set the word length for SPI transactions
384 *
385 * Set the word length (number of bits per word) for SPI transactions.
386 *
387 * @bus: The SPI slave
388 * @wordlen: The number of bits in a word
389 *
390 * Returns: 0 on success, -ve on failure.
391 */
392 int (*set_wordlen)(struct udevice *dev, unsigned int wordlen);
393
394 /**
395 * SPI transfer
396 *
397 * This writes "bitlen" bits out the SPI MOSI port and simultaneously
398 * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI
399 * works.
400 *
401 * The source of the outgoing bits is the "dout" parameter and the
402 * destination of the input bits is the "din" parameter. Note that
403 * "dout" and "din" can point to the same memory location, in which
404 * case the input data overwrites the output data (since both are
405 * buffered by temporary variables, this is OK).
406 *
407 * spi_xfer() interface:
408 * @dev: The slave device to communicate with
409 * @bitlen: How many bits to write and read.
410 * @dout: Pointer to a string of bits to send out. The bits are
411 * held in a byte array and are sent MSB first.
412 * @din: Pointer to a string of bits that will be filled in.
413 * @flags: A bitwise combination of SPI_XFER_* flags.
414 *
415 * Returns: 0 on success, not -1 on failure
416 */
417 int (*xfer)(struct udevice *dev, unsigned int bitlen, const void *dout,
418 void *din, unsigned long flags);
419
420 /**
421 * Optimized handlers for SPI memory-like operations.
422 *
423 * Optimized/dedicated operations for interactions with SPI memory. This
424 * field is optional and should only be implemented if the controller
425 * has native support for memory like operations.
426 */
427 const struct spi_controller_mem_ops *mem_ops;
428
429 /**
430 * Set transfer speed.
431 * This sets a new speed to be applied for next spi_xfer().
432 * @bus: The SPI bus
433 * @hz: The transfer speed
434 * @return 0 if OK, -ve on error
435 */
436 int (*set_speed)(struct udevice *bus, uint hz);
437
438 /**
439 * Set the SPI mode/flags
440 *
441 * It is unclear if we want to set speed and mode together instead
442 * of separately.
443 *
444 * @bus: The SPI bus
445 * @mode: Requested SPI mode (SPI_... flags)
446 * @return 0 if OK, -ve on error
447 */
448 int (*set_mode)(struct udevice *bus, uint mode);
449
450 /**
451 * Get information on a chip select
452 *
453 * This is only called when the SPI uclass does not know about a
454 * chip select, i.e. it has no attached device. It gives the driver
455 * a chance to allow activity on that chip select even so.
456 *
457 * @bus: The SPI bus
458 * @cs: The chip select (0..n-1)
459 * @info: Returns information about the chip select, if valid.
460 * On entry info->dev is NULL
461 * @return 0 if OK (and @info is set up), -EINVAL if the chip select
462 * is invalid, other -ve value on error
463 */
464 int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info);
465
466 /**
467 * get_mmap() - Get memory-mapped SPI
468 *
469 * @dev: The SPI flash slave device
470 * @map_basep: Returns base memory address for mapped SPI
471 * @map_sizep: Returns size of mapped SPI
472 * @offsetp: Returns start offset of SPI flash where the map works
473 * correctly (offsets before this are not visible)
474 * @return 0 if OK, -EFAULT if memory mapping is not available
475 */
476 int (*get_mmap)(struct udevice *dev, ulong *map_basep,
477 uint *map_sizep, uint *offsetp);
478 };
479
480 struct dm_spi_emul_ops {
481 /**
482 * SPI transfer
483 *
484 * This writes "bitlen" bits out the SPI MOSI port and simultaneously
485 * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI
486 * works. Here the device is a slave.
487 *
488 * The source of the outgoing bits is the "dout" parameter and the
489 * destination of the input bits is the "din" parameter. Note that
490 * "dout" and "din" can point to the same memory location, in which
491 * case the input data overwrites the output data (since both are
492 * buffered by temporary variables, this is OK).
493 *
494 * spi_xfer() interface:
495 * @slave: The SPI slave which will be sending/receiving the data.
496 * @bitlen: How many bits to write and read.
497 * @dout: Pointer to a string of bits sent to the device. The
498 * bits are held in a byte array and are sent MSB first.
499 * @din: Pointer to a string of bits that will be sent back to
500 * the master.
501 * @flags: A bitwise combination of SPI_XFER_* flags.
502 *
503 * Returns: 0 on success, not -1 on failure
504 */
505 int (*xfer)(struct udevice *slave, unsigned int bitlen,
506 const void *dout, void *din, unsigned long flags);
507 };
508
509 /**
510 * spi_find_bus_and_cs() - Find bus and slave devices by number
511 *
512 * Given a bus number and chip select, this finds the corresponding bus
513 * device and slave device. Neither device is activated by this function,
514 * although they may have been activated previously.
515 *
516 * @busnum: SPI bus number
517 * @cs: Chip select to look for
518 * @busp: Returns bus device
519 * @devp: Return slave device
520 * @return 0 if found, -ENODEV on error
521 */
522 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
523 struct udevice **devp);
524
525 /**
526 * spi_get_bus_and_cs() - Find and activate bus and slave devices by number
527 *
528 * Given a bus number and chip select, this finds the corresponding bus
529 * device and slave device.
530 *
531 * If no such slave exists, and drv_name is not NULL, then a new slave device
532 * is automatically bound on this chip select with requested speed and mode.
533 *
534 * Ths new slave device is probed ready for use with the speed and mode
535 * from platdata when available or the requested values.
536 *
537 * @busnum: SPI bus number
538 * @cs: Chip select to look for
539 * @speed: SPI speed to use for this slave when not available in platdata
540 * @mode: SPI mode to use for this slave when not available in platdata
541 * @drv_name: Name of driver to attach to this chip select
542 * @dev_name: Name of the new device thus created
543 * @busp: Returns bus device
544 * @devp: Return slave device
545 * @return 0 if found, -ve on error
546 */
547 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
548 const char *drv_name, const char *dev_name,
549 struct udevice **busp, struct spi_slave **devp);
550
551 /**
552 * spi_chip_select() - Get the chip select for a slave
553 *
554 * @return the chip select this slave is attached to
555 */
556 int spi_chip_select(struct udevice *slave);
557
558 /**
559 * spi_find_chip_select() - Find the slave attached to chip select
560 *
561 * @bus: SPI bus to search
562 * @cs: Chip select to look for
563 * @devp: Returns the slave device if found
564 * @return 0 if found, -ENODEV on error
565 */
566 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp);
567
568 /**
569 * spi_slave_ofdata_to_platdata() - decode standard SPI platform data
570 *
571 * This decodes the speed and mode for a slave from a device tree node
572 *
573 * @blob: Device tree blob
574 * @node: Node offset to read from
575 * @plat: Place to put the decoded information
576 */
577 int spi_slave_ofdata_to_platdata(struct udevice *dev,
578 struct dm_spi_slave_platdata *plat);
579
580 /**
581 * spi_cs_info() - Check information on a chip select
582 *
583 * This checks a particular chip select on a bus to see if it has a device
584 * attached, or is even valid.
585 *
586 * @bus: The SPI bus
587 * @cs: The chip select (0..n-1)
588 * @info: Returns information about the chip select, if valid
589 * @return 0 if OK (and @info is set up), -ENODEV if the chip select
590 * is invalid, other -ve value on error
591 */
592 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info);
593
594 struct sandbox_state;
595
596 /**
597 * sandbox_spi_get_emul() - get an emulator for a SPI slave
598 *
599 * This provides a way to attach an emulated SPI device to a particular SPI
600 * slave, so that xfer() operations on the slave will be handled by the
601 * emulator. If a emulator already exists on that chip select it is returned.
602 * Otherwise one is created.
603 *
604 * @state: Sandbox state
605 * @bus: SPI bus requesting the emulator
606 * @slave: SPI slave device requesting the emulator
607 * @emuip: Returns pointer to emulator
608 * @return 0 if OK, -ve on error
609 */
610 int sandbox_spi_get_emul(struct sandbox_state *state,
611 struct udevice *bus, struct udevice *slave,
612 struct udevice **emulp);
613
614 /**
615 * Claim the bus and prepare it for communication with a given slave.
616 *
617 * This must be called before doing any transfers with a SPI slave. It
618 * will enable and initialize any SPI hardware as necessary, and make
619 * sure that the SCK line is in the correct idle state. It is not
620 * allowed to claim the same bus for several slaves without releasing
621 * the bus in between.
622 *
623 * @dev: The SPI slave device
624 *
625 * Returns: 0 if the bus was claimed successfully, or a negative value
626 * if it wasn't.
627 */
628 int dm_spi_claim_bus(struct udevice *dev);
629
630 /**
631 * Release the SPI bus
632 *
633 * This must be called once for every call to dm_spi_claim_bus() after
634 * all transfers have finished. It may disable any SPI hardware as
635 * appropriate.
636 *
637 * @slave: The SPI slave device
638 */
639 void dm_spi_release_bus(struct udevice *dev);
640
641 /**
642 * SPI transfer
643 *
644 * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
645 * "bitlen" bits in the SPI MISO port. That's just the way SPI works.
646 *
647 * The source of the outgoing bits is the "dout" parameter and the
648 * destination of the input bits is the "din" parameter. Note that "dout"
649 * and "din" can point to the same memory location, in which case the
650 * input data overwrites the output data (since both are buffered by
651 * temporary variables, this is OK).
652 *
653 * dm_spi_xfer() interface:
654 * @dev: The SPI slave device which will be sending/receiving the data.
655 * @bitlen: How many bits to write and read.
656 * @dout: Pointer to a string of bits to send out. The bits are
657 * held in a byte array and are sent MSB first.
658 * @din: Pointer to a string of bits that will be filled in.
659 * @flags: A bitwise combination of SPI_XFER_* flags.
660 *
661 * Returns: 0 on success, not 0 on failure
662 */
663 int dm_spi_xfer(struct udevice *dev, unsigned int bitlen,
664 const void *dout, void *din, unsigned long flags);
665
666 /**
667 * spi_get_mmap() - Get memory-mapped SPI
668 *
669 * @dev: SPI slave device to check
670 * @map_basep: Returns base memory address for mapped SPI
671 * @map_sizep: Returns size of mapped SPI
672 * @offsetp: Returns start offset of SPI flash where the map works
673 * correctly (offsets before this are not visible)
674 * @return 0 if OK, -ENOSYS if no operation, -EFAULT if memory mapping is not
675 * available
676 */
677 int dm_spi_get_mmap(struct udevice *dev, ulong *map_basep, uint *map_sizep,
678 uint *offsetp);
679
680 /* Access the operations for a SPI device */
681 #define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops)
682 #define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops)
683 #endif /* CONFIG_DM_SPI */
684
685 #endif /* _SPI_H_ */
686