2 * Common SPI Interface: Controller-specific definitions
5 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
7 * SPDX-License-Identifier: GPL-2.0+
14 #define SPI_CPHA 0x01 /* clock phase */
15 #define SPI_CPOL 0x02 /* clock polarity */
16 #define SPI_MODE_0 (0|0) /* (original MicroWire) */
17 #define SPI_MODE_1 (0|SPI_CPHA)
18 #define SPI_MODE_2 (SPI_CPOL|0)
19 #define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
20 #define SPI_CS_HIGH 0x04 /* CS active high */
21 #define SPI_LSB_FIRST 0x08 /* per-word bits-on-wire */
22 #define SPI_3WIRE 0x10 /* SI/SO signals shared */
23 #define SPI_LOOP 0x20 /* loopback mode */
24 #define SPI_SLAVE 0x40 /* slave mode */
25 #define SPI_PREAMBLE 0x80 /* Skip preamble bytes */
27 /* SPI transfer flags */
28 #define SPI_XFER_BEGIN 0x01 /* Assert CS before transfer */
29 #define SPI_XFER_END 0x02 /* Deassert CS after transfer */
30 #define SPI_XFER_MMAP 0x08 /* Memory Mapped start */
31 #define SPI_XFER_MMAP_END 0x10 /* Memory Mapped End */
32 #define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END)
33 #define SPI_XFER_U_PAGE (1 << 5)
35 /* SPI TX operation modes */
36 #define SPI_OPM_TX_QPP (1 << 0)
37 #define SPI_OPM_TX_BP (1 << 1)
39 /* SPI RX operation modes */
40 #define SPI_OPM_RX_AS (1 << 0)
41 #define SPI_OPM_RX_DOUT (1 << 1)
42 #define SPI_OPM_RX_DIO (1 << 2)
43 #define SPI_OPM_RX_QOF (1 << 3)
44 #define SPI_OPM_RX_QIOF (1 << 4)
45 #define SPI_OPM_RX_EXTN (SPI_OPM_RX_AS | SPI_OPM_RX_DOUT | \
46 SPI_OPM_RX_DIO | SPI_OPM_RX_QOF | \
49 /* SPI bus connection options - see enum spi_dual_flash */
50 #define SPI_CONN_DUAL_SHARED (1 << 0)
51 #define SPI_CONN_DUAL_SEPARATED (1 << 1)
53 /* Header byte that marks the start of the message */
54 #define SPI_PREAMBLE_END_BYTE 0xec
56 #define SPI_DEFAULT_WORDLEN 8
63 #endif /* CONFIG_DM_SPI */
66 * struct spi_slave - Representation of a SPI slave
68 * For driver model this is the per-child data used by the SPI bus. It can
69 * be accessed using dev_get_parentdata() on the slave device. Each SPI
70 * driver should define this child data in its U_BOOT_DRIVER() definition:
72 * .per_child_auto_alloc_size = sizeof(struct spi_slave),
74 * If not using driver model, drivers are expected to extend this with
75 * controller-specific data.
77 * @dev: SPI slave device
78 * @max_hz: Maximum speed for this slave
79 * @mode: SPI mode to use for this slave (see SPI mode flags)
80 * @bus: ID of the bus that the slave is attached to. For
81 * driver model this is the sequence number of the SPI
82 * bus (bus->seq) so does not need to be stored
83 * @cs: ID of the chip select connected to the slave.
84 * @op_mode_rx: SPI RX operation mode.
85 * @op_mode_tx: SPI TX operation mode.
86 * @wordlen: Size of SPI word in number of bits
87 * @max_write_size: If non-zero, the maximum number of bytes which can
88 * be written at once, excluding command bytes.
89 * @memory_map: Address of read-only SPI flash access.
90 * @option: Varies SPI bus options - separate, shared bus.
91 * @flags: Indication of SPI flags.
95 struct udevice *dev; /* struct spi_slave is dev->parentdata */
104 unsigned int wordlen;
105 unsigned int max_write_size;
112 * Initialization, must be called once on start up.
114 * TODO: I don't think we really need this.
119 * spi_do_alloc_slave - Allocate a new SPI slave (internal)
121 * Allocate and zero all fields in the spi slave, and set the bus/chip
122 * select. Use the helper macro spi_alloc_slave() to call this.
124 * @offset: Offset of struct spi_slave within slave structure.
125 * @size: Size of slave structure.
126 * @bus: Bus ID of the slave chip.
127 * @cs: Chip select ID of the slave chip on the specified bus.
129 void *spi_do_alloc_slave(int offset, int size, unsigned int bus,
133 * spi_alloc_slave - Allocate a new SPI slave
135 * Allocate and zero all fields in the spi slave, and set the bus/chip
138 * @_struct: Name of structure to allocate (e.g. struct tegra_spi).
139 * This structure must contain a member 'struct spi_slave *slave'.
140 * @bus: Bus ID of the slave chip.
141 * @cs: Chip select ID of the slave chip on the specified bus.
143 #define spi_alloc_slave(_struct, bus, cs) \
144 spi_do_alloc_slave(offsetof(_struct, slave), \
145 sizeof(_struct), bus, cs)
148 * spi_alloc_slave_base - Allocate a new SPI slave with no private data
150 * Allocate and zero all fields in the spi slave, and set the bus/chip
153 * @bus: Bus ID of the slave chip.
154 * @cs: Chip select ID of the slave chip on the specified bus.
156 #define spi_alloc_slave_base(bus, cs) \
157 spi_do_alloc_slave(0, sizeof(struct spi_slave), bus, cs)
160 * Set up communications parameters for a SPI slave.
162 * This must be called once for each slave. Note that this function
163 * usually doesn't touch any actual hardware, it only initializes the
164 * contents of spi_slave so that the hardware can be easily
167 * @bus: Bus ID of the slave chip.
168 * @cs: Chip select ID of the slave chip on the specified bus.
169 * @max_hz: Maximum SCK rate in Hz.
170 * @mode: Clock polarity, clock phase and other parameters.
172 * Returns: A spi_slave reference that can be used in subsequent SPI
173 * calls, or NULL if one or more of the parameters are not supported.
175 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
176 unsigned int max_hz, unsigned int mode);
179 * Free any memory associated with a SPI slave.
181 * @slave: The SPI slave
183 void spi_free_slave(struct spi_slave *slave);
186 * Claim the bus and prepare it for communication with a given slave.
188 * This must be called before doing any transfers with a SPI slave. It
189 * will enable and initialize any SPI hardware as necessary, and make
190 * sure that the SCK line is in the correct idle state. It is not
191 * allowed to claim the same bus for several slaves without releasing
192 * the bus in between.
194 * @slave: The SPI slave
196 * Returns: 0 if the bus was claimed successfully, or a negative value
199 int spi_claim_bus(struct spi_slave *slave);
202 * Release the SPI bus
204 * This must be called once for every call to spi_claim_bus() after
205 * all transfers have finished. It may disable any SPI hardware as
208 * @slave: The SPI slave
210 void spi_release_bus(struct spi_slave *slave);
213 * Set the word length for SPI transactions
215 * Set the word length (number of bits per word) for SPI transactions.
217 * @slave: The SPI slave
218 * @wordlen: The number of bits in a word
220 * Returns: 0 on success, -1 on failure.
222 int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
227 * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
228 * "bitlen" bits in the SPI MISO port. That's just the way SPI works.
230 * The source of the outgoing bits is the "dout" parameter and the
231 * destination of the input bits is the "din" parameter. Note that "dout"
232 * and "din" can point to the same memory location, in which case the
233 * input data overwrites the output data (since both are buffered by
234 * temporary variables, this is OK).
236 * spi_xfer() interface:
237 * @slave: The SPI slave which will be sending/receiving the data.
238 * @bitlen: How many bits to write and read.
239 * @dout: Pointer to a string of bits to send out. The bits are
240 * held in a byte array and are sent MSB first.
241 * @din: Pointer to a string of bits that will be filled in.
242 * @flags: A bitwise combination of SPI_XFER_* flags.
244 * Returns: 0 on success, not 0 on failure
246 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
247 void *din, unsigned long flags);
250 * Determine if a SPI chipselect is valid.
251 * This function is provided by the board if the low-level SPI driver
252 * needs it to determine if a given chipselect is actually valid.
254 * Returns: 1 if bus:cs identifies a valid chip on this board, 0
257 int spi_cs_is_valid(unsigned int bus, unsigned int cs);
259 #ifndef CONFIG_DM_SPI
261 * Activate a SPI chipselect.
262 * This function is provided by the board code when using a driver
263 * that can't control its chipselects automatically (e.g.
264 * common/soft_spi.c). When called, it should activate the chip select
265 * to the device identified by "slave".
267 void spi_cs_activate(struct spi_slave *slave);
270 * Deactivate a SPI chipselect.
271 * This function is provided by the board code when using a driver
272 * that can't control its chipselects automatically (e.g.
273 * common/soft_spi.c). When called, it should deactivate the chip
274 * select to the device identified by "slave".
276 void spi_cs_deactivate(struct spi_slave *slave);
279 * Set transfer speed.
280 * This sets a new speed to be applied for next spi_xfer().
281 * @slave: The SPI slave
282 * @hz: The transfer speed
284 void spi_set_speed(struct spi_slave *slave, uint hz);
288 * Write 8 bits, then read 8 bits.
289 * @slave: The SPI slave we're communicating with
290 * @byte: Byte to be written
292 * Returns: The value that was read, or a negative value on error.
294 * TODO: This function probably shouldn't be inlined.
296 static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte)
298 unsigned char dout[2];
299 unsigned char din[2];
305 ret = spi_xfer(slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END);
306 return ret < 0 ? ret : din[1];
310 * Set up a SPI slave for a particular device tree node
312 * This calls spi_setup_slave() with the correct bus number. Call
313 * spi_free_slave() to free it later.
315 * @param blob: Device tree blob
316 * @param slave_node: Slave node to use
317 * @param spi_node: SPI peripheral node to use
318 * @return pointer to new spi_slave structure
320 struct spi_slave *spi_setup_slave_fdt(const void *blob, int slave_node,
324 * spi_base_setup_slave_fdt() - helper function to set up a SPI slace
326 * This decodes SPI properties from the slave node to determine the
327 * chip select and SPI parameters.
329 * @blob: Device tree blob
330 * @busnum: Bus number to use
331 * @node: Device tree node for the SPI bus
333 struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
339 * struct spi_cs_info - Information about a bus chip select
341 * @dev: Connected device, or NULL if none
348 * struct struct dm_spi_ops - Driver model SPI operations
350 * The uclass interface is implemented by all SPI devices which use
355 * Claim the bus and prepare it for communication.
357 * The device provided is the slave device. It's parent controller
358 * will be used to provide the communication.
360 * This must be called before doing any transfers with a SPI slave. It
361 * will enable and initialize any SPI hardware as necessary, and make
362 * sure that the SCK line is in the correct idle state. It is not
363 * allowed to claim the same bus for several slaves without releasing
364 * the bus in between.
366 * @bus: The SPI slave
368 * Returns: 0 if the bus was claimed successfully, or a negative value
371 int (*claim_bus)(struct udevice *bus);
374 * Release the SPI bus
376 * This must be called once for every call to spi_claim_bus() after
377 * all transfers have finished. It may disable any SPI hardware as
380 * @bus: The SPI slave
382 int (*release_bus)(struct udevice *bus);
385 * Set the word length for SPI transactions
387 * Set the word length (number of bits per word) for SPI transactions.
389 * @bus: The SPI slave
390 * @wordlen: The number of bits in a word
392 * Returns: 0 on success, -ve on failure.
394 int (*set_wordlen)(struct udevice *bus, unsigned int wordlen);
399 * This writes "bitlen" bits out the SPI MOSI port and simultaneously
400 * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI
403 * The source of the outgoing bits is the "dout" parameter and the
404 * destination of the input bits is the "din" parameter. Note that
405 * "dout" and "din" can point to the same memory location, in which
406 * case the input data overwrites the output data (since both are
407 * buffered by temporary variables, this is OK).
409 * spi_xfer() interface:
410 * @dev: The slave device to communicate with
411 * @bitlen: How many bits to write and read.
412 * @dout: Pointer to a string of bits to send out. The bits are
413 * held in a byte array and are sent MSB first.
414 * @din: Pointer to a string of bits that will be filled in.
415 * @flags: A bitwise combination of SPI_XFER_* flags.
417 * Returns: 0 on success, not -1 on failure
419 int (*xfer)(struct udevice *dev, unsigned int bitlen, const void *dout,
420 void *din, unsigned long flags);
423 * Set transfer speed.
424 * This sets a new speed to be applied for next spi_xfer().
426 * @hz: The transfer speed
427 * @return 0 if OK, -ve on error
429 int (*set_speed)(struct udevice *bus, uint hz);
432 * Set the SPI mode/flags
434 * It is unclear if we want to set speed and mode together instead
438 * @mode: Requested SPI mode (SPI_... flags)
439 * @return 0 if OK, -ve on error
441 int (*set_mode)(struct udevice *bus, uint mode);
444 * Get information on a chip select
446 * This is only called when the SPI uclass does not know about a
447 * chip select, i.e. it has no attached device. It gives the driver
448 * a chance to allow activity on that chip select even so.
451 * @cs: The chip select (0..n-1)
452 * @info: Returns information about the chip select, if valid.
453 * On entry info->dev is NULL
454 * @return 0 if OK (and @info is set up), -ENODEV if the chip select
455 * is invalid, other -ve value on error
457 int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info);
460 struct dm_spi_emul_ops {
464 * This writes "bitlen" bits out the SPI MOSI port and simultaneously
465 * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI
466 * works. Here the device is a slave.
468 * The source of the outgoing bits is the "dout" parameter and the
469 * destination of the input bits is the "din" parameter. Note that
470 * "dout" and "din" can point to the same memory location, in which
471 * case the input data overwrites the output data (since both are
472 * buffered by temporary variables, this is OK).
474 * spi_xfer() interface:
475 * @slave: The SPI slave which will be sending/receiving the data.
476 * @bitlen: How many bits to write and read.
477 * @dout: Pointer to a string of bits sent to the device. The
478 * bits are held in a byte array and are sent MSB first.
479 * @din: Pointer to a string of bits that will be sent back to
481 * @flags: A bitwise combination of SPI_XFER_* flags.
483 * Returns: 0 on success, not -1 on failure
485 int (*xfer)(struct udevice *slave, unsigned int bitlen,
486 const void *dout, void *din, unsigned long flags);
490 * spi_find_bus_and_cs() - Find bus and slave devices by number
492 * Given a bus number and chip select, this finds the corresponding bus
493 * device and slave device. Neither device is activated by this function,
494 * although they may have been activated previously.
496 * @busnum: SPI bus number
497 * @cs: Chip select to look for
498 * @busp: Returns bus device
499 * @devp: Return slave device
500 * @return 0 if found, -ENODEV on error
502 int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
503 struct udevice **devp);
506 * spi_get_bus_and_cs() - Find and activate bus and slave devices by number
508 * Given a bus number and chip select, this finds the corresponding bus
509 * device and slave device.
511 * If no such slave exists, and drv_name is not NULL, then a new slave device
512 * is automatically bound on this chip select.
514 * Ths new slave device is probed ready for use with the given speed and mode.
516 * @busnum: SPI bus number
517 * @cs: Chip select to look for
518 * @speed: SPI speed to use for this slave
519 * @mode: SPI mode to use for this slave
520 * @drv_name: Name of driver to attach to this chip select
521 * @dev_name: Name of the new device thus created
522 * @busp: Returns bus device
523 * @devp: Return slave device
524 * @return 0 if found, -ve on error
526 int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
527 const char *drv_name, const char *dev_name,
528 struct udevice **busp, struct spi_slave **devp);
531 * spi_chip_select() - Get the chip select for a slave
533 * @return the chip select this slave is attached to
535 int spi_chip_select(struct udevice *slave);
538 * spi_find_chip_select() - Find the slave attached to chip select
540 * @bus: SPI bus to search
541 * @cs: Chip select to look for
542 * @devp: Returns the slave device if found
543 * @return 0 if found, -ENODEV on error
545 int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp);
548 * spi_ofdata_to_platdata() - decode standard SPI platform data
550 * This decodes the speed and mode from a device tree node and puts it into
551 * the spi_slave structure.
553 * @blob: Device tree blob
554 * @node: Node offset to read from
555 * @spi: Place to put the decoded information
557 int spi_ofdata_to_platdata(const void *blob, int node, struct spi_slave *spi);
560 * spi_cs_info() - Check information on a chip select
562 * This checks a particular chip select on a bus to see if it has a device
563 * attached, or is even valid.
566 * @cs: The chip select (0..n-1)
567 * @info: Returns information about the chip select, if valid
568 * @return 0 if OK (and @info is set up), -ENODEV if the chip select
569 * is invalid, other -ve value on error
571 int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info);
573 struct sandbox_state;
576 * sandbox_spi_get_emul() - get an emulator for a SPI slave
578 * This provides a way to attach an emulated SPI device to a particular SPI
579 * slave, so that xfer() operations on the slave will be handled by the
580 * emulator. If a emulator already exists on that chip select it is returned.
581 * Otherwise one is created.
583 * @state: Sandbox state
584 * @bus: SPI bus requesting the emulator
585 * @slave: SPI slave device requesting the emulator
586 * @emuip: Returns pointer to emulator
587 * @return 0 if OK, -ve on error
589 int sandbox_spi_get_emul(struct sandbox_state *state,
590 struct udevice *bus, struct udevice *slave,
591 struct udevice **emulp);
593 /* Access the serial operations for a device */
594 #define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops)
595 #define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops)
596 #endif /* CONFIG_DM_SPI */