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Commit | Line | Data |
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77f85581 | 1 | /* |
469146c0 JT |
2 | * Common SPI Interface: Controller-specific definitions |
3 | * | |
77f85581 WD |
4 | * (C) Copyright 2001 |
5 | * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com. | |
6 | * | |
1a459660 | 7 | * SPDX-License-Identifier: GPL-2.0+ |
77f85581 WD |
8 | */ |
9 | ||
10 | #ifndef _SPI_H_ | |
11 | #define _SPI_H_ | |
12 | ||
38254f45 | 13 | /* SPI mode flags */ |
465c00d7 JT |
14 | #define SPI_CPHA BIT(0) /* clock phase */ |
15 | #define SPI_CPOL BIT(1) /* 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 BIT(2) /* CS active high */ | |
21 | #define SPI_LSB_FIRST BIT(3) /* per-word bits-on-wire */ | |
22 | #define SPI_3WIRE BIT(4) /* SI/SO signals shared */ | |
23 | #define SPI_LOOP BIT(5) /* loopback mode */ | |
24 | #define SPI_SLAVE BIT(6) /* slave mode */ | |
25 | #define SPI_PREAMBLE BIT(7) /* Skip preamble bytes */ | |
29ee0262 JT |
26 | #define SPI_TX_BYTE BIT(8) /* transmit with 1 wire byte */ |
27 | #define SPI_TX_QUAD BIT(9) /* transmit with 4 wires */ | |
38254f45 | 28 | |
91292e0b | 29 | /* SPI mode_rx flags */ |
465c00d7 JT |
30 | #define SPI_RX_SLOW BIT(0) /* receive with 1 wire slow */ |
31 | #define SPI_RX_FAST BIT(1) /* receive with 1 wire fast */ | |
32 | #define SPI_RX_DUAL BIT(2) /* receive with 2 wires */ | |
1c17f5ec | 33 | #define SPI_RX_QUAD BIT(3) /* receive with 4 wires */ |
4e09cc1e | 34 | |
248a0488 SG |
35 | /* SPI bus connection options - see enum spi_dual_flash */ |
36 | #define SPI_CONN_DUAL_SHARED (1 << 0) | |
37 | #define SPI_CONN_DUAL_SEPARATED (1 << 1) | |
f77f4691 | 38 | |
bb786b84 | 39 | /* Header byte that marks the start of the message */ |
ce22b922 | 40 | #define SPI_PREAMBLE_END_BYTE 0xec |
bb786b84 | 41 | |
5d69df35 | 42 | #define SPI_DEFAULT_WORDLEN 8 |
5753d09b | 43 | |
d7af6a48 | 44 | #ifdef CONFIG_DM_SPI |
d0cff03e | 45 | /* TODO(sjg@chromium.org): Remove this and use max_hz from struct spi_slave */ |
d7af6a48 SG |
46 | struct dm_spi_bus { |
47 | uint max_hz; | |
48 | }; | |
49 | ||
d0cff03e SG |
50 | /** |
51 | * struct dm_spi_platdata - platform data for all SPI slaves | |
52 | * | |
53 | * This describes a SPI slave, a child device of the SPI bus. To obtain this | |
54 | * struct from a spi_slave, use dev_get_parent_platdata(dev) or | |
55 | * dev_get_parent_platdata(slave->dev). | |
56 | * | |
57 | * This data is immuatable. Each time the device is probed, @max_hz and @mode | |
58 | * will be copied to struct spi_slave. | |
59 | * | |
60 | * @cs: Chip select number (0..n-1) | |
61 | * @max_hz: Maximum bus speed that this slave can tolerate | |
62 | * @mode: SPI mode to use for this device (see SPI mode flags) | |
63 | */ | |
64 | struct dm_spi_slave_platdata { | |
65 | unsigned int cs; | |
66 | uint max_hz; | |
67 | uint mode; | |
68 | }; | |
69 | ||
d7af6a48 SG |
70 | #endif /* CONFIG_DM_SPI */ |
71 | ||
1b1bd9a7 | 72 | /** |
ce22b922 | 73 | * struct spi_slave - Representation of a SPI slave |
d255bb0e | 74 | * |
d7af6a48 | 75 | * For driver model this is the per-child data used by the SPI bus. It can |
bcbe3d15 | 76 | * be accessed using dev_get_parent_priv() on the slave device. The SPI uclass |
d0cff03e SG |
77 | * sets uip per_child_auto_alloc_size to sizeof(struct spi_slave), and the |
78 | * driver should not override it. Two platform data fields (max_hz and mode) | |
79 | * are copied into this structure to provide an initial value. This allows | |
80 | * them to be changed, since we should never change platform data in drivers. | |
d255bb0e | 81 | * |
d7af6a48 SG |
82 | * If not using driver model, drivers are expected to extend this with |
83 | * controller-specific data. | |
84 | * | |
85 | * @dev: SPI slave device | |
86 | * @max_hz: Maximum speed for this slave | |
60e2809a SG |
87 | * @speed: Current bus speed. This is 0 until the bus is first |
88 | * claimed. | |
d7af6a48 SG |
89 | * @bus: ID of the bus that the slave is attached to. For |
90 | * driver model this is the sequence number of the SPI | |
91 | * bus (bus->seq) so does not need to be stored | |
ce22b922 | 92 | * @cs: ID of the chip select connected to the slave. |
f5c3c033 | 93 | * @mode: SPI mode to use for this slave (see SPI mode flags) |
91292e0b | 94 | * @mode_rx: SPI RX mode to use for this slave (see SPI mode_rx flags) |
5753d09b | 95 | * @wordlen: Size of SPI word in number of bits |
ce22b922 JT |
96 | * @max_write_size: If non-zero, the maximum number of bytes which can |
97 | * be written at once, excluding command bytes. | |
98 | * @memory_map: Address of read-only SPI flash access. | |
056fbc73 | 99 | * @option: Varies SPI bus options - separate, shared bus. |
f77f4691 | 100 | * @flags: Indication of SPI flags. |
d255bb0e HS |
101 | */ |
102 | struct spi_slave { | |
d7af6a48 SG |
103 | #ifdef CONFIG_DM_SPI |
104 | struct udevice *dev; /* struct spi_slave is dev->parentdata */ | |
105 | uint max_hz; | |
60e2809a | 106 | uint speed; |
d7af6a48 | 107 | #else |
1b1bd9a7 JT |
108 | unsigned int bus; |
109 | unsigned int cs; | |
d0cff03e | 110 | #endif |
f5c3c033 | 111 | uint mode; |
91292e0b | 112 | u8 mode_rx; |
5753d09b | 113 | unsigned int wordlen; |
0c456cee | 114 | unsigned int max_write_size; |
004f15b6 | 115 | void *memory_map; |
f77f4691 | 116 | u8 option; |
c40f6003 | 117 | |
f77f4691 | 118 | u8 flags; |
29ee0262 JT |
119 | #define SPI_XFER_BEGIN BIT(0) /* Assert CS before transfer */ |
120 | #define SPI_XFER_END BIT(1) /* Deassert CS after transfer */ | |
c40f6003 | 121 | #define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END) |
29ee0262 JT |
122 | #define SPI_XFER_MMAP BIT(2) /* Memory Mapped start */ |
123 | #define SPI_XFER_MMAP_END BIT(3) /* Memory Mapped End */ | |
124 | #define SPI_XFER_U_PAGE BIT(4) | |
d255bb0e | 125 | }; |
77f85581 | 126 | |
1b1bd9a7 | 127 | /** |
77f85581 | 128 | * Initialization, must be called once on start up. |
d255bb0e HS |
129 | * |
130 | * TODO: I don't think we really need this. | |
77f85581 WD |
131 | */ |
132 | void spi_init(void); | |
133 | ||
ba6c3ce9 SG |
134 | /** |
135 | * spi_do_alloc_slave - Allocate a new SPI slave (internal) | |
136 | * | |
137 | * Allocate and zero all fields in the spi slave, and set the bus/chip | |
138 | * select. Use the helper macro spi_alloc_slave() to call this. | |
139 | * | |
1b1bd9a7 JT |
140 | * @offset: Offset of struct spi_slave within slave structure. |
141 | * @size: Size of slave structure. | |
142 | * @bus: Bus ID of the slave chip. | |
143 | * @cs: Chip select ID of the slave chip on the specified bus. | |
ba6c3ce9 SG |
144 | */ |
145 | void *spi_do_alloc_slave(int offset, int size, unsigned int bus, | |
146 | unsigned int cs); | |
147 | ||
148 | /** | |
149 | * spi_alloc_slave - Allocate a new SPI slave | |
150 | * | |
151 | * Allocate and zero all fields in the spi slave, and set the bus/chip | |
152 | * select. | |
153 | * | |
1b1bd9a7 JT |
154 | * @_struct: Name of structure to allocate (e.g. struct tegra_spi). |
155 | * This structure must contain a member 'struct spi_slave *slave'. | |
156 | * @bus: Bus ID of the slave chip. | |
157 | * @cs: Chip select ID of the slave chip on the specified bus. | |
ba6c3ce9 SG |
158 | */ |
159 | #define spi_alloc_slave(_struct, bus, cs) \ | |
160 | spi_do_alloc_slave(offsetof(_struct, slave), \ | |
161 | sizeof(_struct), bus, cs) | |
162 | ||
163 | /** | |
164 | * spi_alloc_slave_base - Allocate a new SPI slave with no private data | |
165 | * | |
166 | * Allocate and zero all fields in the spi slave, and set the bus/chip | |
167 | * select. | |
168 | * | |
1b1bd9a7 JT |
169 | * @bus: Bus ID of the slave chip. |
170 | * @cs: Chip select ID of the slave chip on the specified bus. | |
ba6c3ce9 SG |
171 | */ |
172 | #define spi_alloc_slave_base(bus, cs) \ | |
173 | spi_do_alloc_slave(0, sizeof(struct spi_slave), bus, cs) | |
174 | ||
1b1bd9a7 | 175 | /** |
d255bb0e HS |
176 | * Set up communications parameters for a SPI slave. |
177 | * | |
178 | * This must be called once for each slave. Note that this function | |
179 | * usually doesn't touch any actual hardware, it only initializes the | |
180 | * contents of spi_slave so that the hardware can be easily | |
181 | * initialized later. | |
182 | * | |
1b1bd9a7 JT |
183 | * @bus: Bus ID of the slave chip. |
184 | * @cs: Chip select ID of the slave chip on the specified bus. | |
185 | * @max_hz: Maximum SCK rate in Hz. | |
186 | * @mode: Clock polarity, clock phase and other parameters. | |
d255bb0e HS |
187 | * |
188 | * Returns: A spi_slave reference that can be used in subsequent SPI | |
189 | * calls, or NULL if one or more of the parameters are not supported. | |
190 | */ | |
191 | struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, | |
192 | unsigned int max_hz, unsigned int mode); | |
193 | ||
1b1bd9a7 | 194 | /** |
d255bb0e HS |
195 | * Free any memory associated with a SPI slave. |
196 | * | |
1b1bd9a7 | 197 | * @slave: The SPI slave |
d255bb0e HS |
198 | */ |
199 | void spi_free_slave(struct spi_slave *slave); | |
200 | ||
1b1bd9a7 | 201 | /** |
d255bb0e HS |
202 | * Claim the bus and prepare it for communication with a given slave. |
203 | * | |
204 | * This must be called before doing any transfers with a SPI slave. It | |
205 | * will enable and initialize any SPI hardware as necessary, and make | |
206 | * sure that the SCK line is in the correct idle state. It is not | |
207 | * allowed to claim the same bus for several slaves without releasing | |
208 | * the bus in between. | |
209 | * | |
1b1bd9a7 | 210 | * @slave: The SPI slave |
d255bb0e HS |
211 | * |
212 | * Returns: 0 if the bus was claimed successfully, or a negative value | |
213 | * if it wasn't. | |
214 | */ | |
215 | int spi_claim_bus(struct spi_slave *slave); | |
216 | ||
1b1bd9a7 | 217 | /** |
d255bb0e HS |
218 | * Release the SPI bus |
219 | * | |
220 | * This must be called once for every call to spi_claim_bus() after | |
221 | * all transfers have finished. It may disable any SPI hardware as | |
222 | * appropriate. | |
223 | * | |
1b1bd9a7 | 224 | * @slave: The SPI slave |
d255bb0e HS |
225 | */ |
226 | void spi_release_bus(struct spi_slave *slave); | |
77f85581 | 227 | |
5753d09b NK |
228 | /** |
229 | * Set the word length for SPI transactions | |
230 | * | |
231 | * Set the word length (number of bits per word) for SPI transactions. | |
232 | * | |
233 | * @slave: The SPI slave | |
234 | * @wordlen: The number of bits in a word | |
235 | * | |
236 | * Returns: 0 on success, -1 on failure. | |
237 | */ | |
238 | int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen); | |
239 | ||
1b1bd9a7 | 240 | /** |
77f85581 WD |
241 | * SPI transfer |
242 | * | |
243 | * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks | |
244 | * "bitlen" bits in the SPI MISO port. That's just the way SPI works. | |
245 | * | |
246 | * The source of the outgoing bits is the "dout" parameter and the | |
247 | * destination of the input bits is the "din" parameter. Note that "dout" | |
248 | * and "din" can point to the same memory location, in which case the | |
249 | * input data overwrites the output data (since both are buffered by | |
250 | * temporary variables, this is OK). | |
251 | * | |
77f85581 | 252 | * spi_xfer() interface: |
1b1bd9a7 JT |
253 | * @slave: The SPI slave which will be sending/receiving the data. |
254 | * @bitlen: How many bits to write and read. | |
255 | * @dout: Pointer to a string of bits to send out. The bits are | |
d255bb0e | 256 | * held in a byte array and are sent MSB first. |
1b1bd9a7 JT |
257 | * @din: Pointer to a string of bits that will be filled in. |
258 | * @flags: A bitwise combination of SPI_XFER_* flags. | |
77f85581 | 259 | * |
1b1bd9a7 | 260 | * Returns: 0 on success, not 0 on failure |
77f85581 | 261 | */ |
d255bb0e HS |
262 | int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, |
263 | void *din, unsigned long flags); | |
264 | ||
146bad96 TR |
265 | /* Copy memory mapped data */ |
266 | void spi_flash_copy_mmap(void *data, void *offset, size_t len); | |
267 | ||
1b1bd9a7 | 268 | /** |
d255bb0e HS |
269 | * Determine if a SPI chipselect is valid. |
270 | * This function is provided by the board if the low-level SPI driver | |
271 | * needs it to determine if a given chipselect is actually valid. | |
272 | * | |
273 | * Returns: 1 if bus:cs identifies a valid chip on this board, 0 | |
274 | * otherwise. | |
275 | */ | |
d7af6a48 | 276 | int spi_cs_is_valid(unsigned int bus, unsigned int cs); |
d255bb0e | 277 | |
d7af6a48 | 278 | #ifndef CONFIG_DM_SPI |
1b1bd9a7 | 279 | /** |
d255bb0e HS |
280 | * Activate a SPI chipselect. |
281 | * This function is provided by the board code when using a driver | |
282 | * that can't control its chipselects automatically (e.g. | |
283 | * common/soft_spi.c). When called, it should activate the chip select | |
284 | * to the device identified by "slave". | |
285 | */ | |
286 | void spi_cs_activate(struct spi_slave *slave); | |
287 | ||
1b1bd9a7 | 288 | /** |
d255bb0e HS |
289 | * Deactivate a SPI chipselect. |
290 | * This function is provided by the board code when using a driver | |
291 | * that can't control its chipselects automatically (e.g. | |
292 | * common/soft_spi.c). When called, it should deactivate the chip | |
293 | * select to the device identified by "slave". | |
294 | */ | |
295 | void spi_cs_deactivate(struct spi_slave *slave); | |
296 | ||
1b1bd9a7 | 297 | /** |
fa1423e7 TC |
298 | * Set transfer speed. |
299 | * This sets a new speed to be applied for next spi_xfer(). | |
1b1bd9a7 JT |
300 | * @slave: The SPI slave |
301 | * @hz: The transfer speed | |
fa1423e7 TC |
302 | */ |
303 | void spi_set_speed(struct spi_slave *slave, uint hz); | |
d7af6a48 | 304 | #endif |
fa1423e7 | 305 | |
1b1bd9a7 | 306 | /** |
d255bb0e | 307 | * Write 8 bits, then read 8 bits. |
1b1bd9a7 JT |
308 | * @slave: The SPI slave we're communicating with |
309 | * @byte: Byte to be written | |
d255bb0e HS |
310 | * |
311 | * Returns: The value that was read, or a negative value on error. | |
312 | * | |
313 | * TODO: This function probably shouldn't be inlined. | |
314 | */ | |
315 | static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte) | |
316 | { | |
317 | unsigned char dout[2]; | |
318 | unsigned char din[2]; | |
319 | int ret; | |
320 | ||
321 | dout[0] = byte; | |
322 | dout[1] = 0; | |
38254f45 | 323 | |
d255bb0e HS |
324 | ret = spi_xfer(slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END); |
325 | return ret < 0 ? ret : din[1]; | |
326 | } | |
77f85581 | 327 | |
f3424c55 HT |
328 | /** |
329 | * Set up a SPI slave for a particular device tree node | |
330 | * | |
331 | * This calls spi_setup_slave() with the correct bus number. Call | |
332 | * spi_free_slave() to free it later. | |
333 | * | |
469146c0 | 334 | * @param blob: Device tree blob |
0efc0249 SG |
335 | * @param slave_node: Slave node to use |
336 | * @param spi_node: SPI peripheral node to use | |
f3424c55 HT |
337 | * @return pointer to new spi_slave structure |
338 | */ | |
0efc0249 SG |
339 | struct spi_slave *spi_setup_slave_fdt(const void *blob, int slave_node, |
340 | int spi_node); | |
341 | ||
342 | /** | |
343 | * spi_base_setup_slave_fdt() - helper function to set up a SPI slace | |
344 | * | |
345 | * This decodes SPI properties from the slave node to determine the | |
346 | * chip select and SPI parameters. | |
347 | * | |
348 | * @blob: Device tree blob | |
349 | * @busnum: Bus number to use | |
350 | * @node: Device tree node for the SPI bus | |
351 | */ | |
352 | struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum, | |
353 | int node); | |
f3424c55 | 354 | |
d7af6a48 SG |
355 | #ifdef CONFIG_DM_SPI |
356 | ||
357 | /** | |
358 | * struct spi_cs_info - Information about a bus chip select | |
359 | * | |
360 | * @dev: Connected device, or NULL if none | |
361 | */ | |
362 | struct spi_cs_info { | |
363 | struct udevice *dev; | |
364 | }; | |
365 | ||
366 | /** | |
367 | * struct struct dm_spi_ops - Driver model SPI operations | |
368 | * | |
369 | * The uclass interface is implemented by all SPI devices which use | |
370 | * driver model. | |
371 | */ | |
372 | struct dm_spi_ops { | |
373 | /** | |
374 | * Claim the bus and prepare it for communication. | |
375 | * | |
376 | * The device provided is the slave device. It's parent controller | |
377 | * will be used to provide the communication. | |
378 | * | |
379 | * This must be called before doing any transfers with a SPI slave. It | |
380 | * will enable and initialize any SPI hardware as necessary, and make | |
381 | * sure that the SCK line is in the correct idle state. It is not | |
382 | * allowed to claim the same bus for several slaves without releasing | |
383 | * the bus in between. | |
384 | * | |
9694b724 | 385 | * @dev: The SPI slave |
d7af6a48 SG |
386 | * |
387 | * Returns: 0 if the bus was claimed successfully, or a negative value | |
388 | * if it wasn't. | |
389 | */ | |
9694b724 | 390 | int (*claim_bus)(struct udevice *dev); |
d7af6a48 SG |
391 | |
392 | /** | |
393 | * Release the SPI bus | |
394 | * | |
395 | * This must be called once for every call to spi_claim_bus() after | |
396 | * all transfers have finished. It may disable any SPI hardware as | |
397 | * appropriate. | |
398 | * | |
9694b724 | 399 | * @dev: The SPI slave |
d7af6a48 | 400 | */ |
9694b724 | 401 | int (*release_bus)(struct udevice *dev); |
d7af6a48 SG |
402 | |
403 | /** | |
404 | * Set the word length for SPI transactions | |
405 | * | |
406 | * Set the word length (number of bits per word) for SPI transactions. | |
407 | * | |
408 | * @bus: The SPI slave | |
409 | * @wordlen: The number of bits in a word | |
410 | * | |
411 | * Returns: 0 on success, -ve on failure. | |
412 | */ | |
9694b724 | 413 | int (*set_wordlen)(struct udevice *dev, unsigned int wordlen); |
d7af6a48 SG |
414 | |
415 | /** | |
416 | * SPI transfer | |
417 | * | |
418 | * This writes "bitlen" bits out the SPI MOSI port and simultaneously | |
419 | * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI | |
420 | * works. | |
421 | * | |
422 | * The source of the outgoing bits is the "dout" parameter and the | |
423 | * destination of the input bits is the "din" parameter. Note that | |
424 | * "dout" and "din" can point to the same memory location, in which | |
425 | * case the input data overwrites the output data (since both are | |
426 | * buffered by temporary variables, this is OK). | |
427 | * | |
428 | * spi_xfer() interface: | |
429 | * @dev: The slave device to communicate with | |
430 | * @bitlen: How many bits to write and read. | |
431 | * @dout: Pointer to a string of bits to send out. The bits are | |
432 | * held in a byte array and are sent MSB first. | |
433 | * @din: Pointer to a string of bits that will be filled in. | |
434 | * @flags: A bitwise combination of SPI_XFER_* flags. | |
435 | * | |
436 | * Returns: 0 on success, not -1 on failure | |
437 | */ | |
438 | int (*xfer)(struct udevice *dev, unsigned int bitlen, const void *dout, | |
439 | void *din, unsigned long flags); | |
440 | ||
441 | /** | |
442 | * Set transfer speed. | |
443 | * This sets a new speed to be applied for next spi_xfer(). | |
444 | * @bus: The SPI bus | |
445 | * @hz: The transfer speed | |
446 | * @return 0 if OK, -ve on error | |
447 | */ | |
448 | int (*set_speed)(struct udevice *bus, uint hz); | |
449 | ||
450 | /** | |
451 | * Set the SPI mode/flags | |
452 | * | |
453 | * It is unclear if we want to set speed and mode together instead | |
454 | * of separately. | |
455 | * | |
456 | * @bus: The SPI bus | |
457 | * @mode: Requested SPI mode (SPI_... flags) | |
458 | * @return 0 if OK, -ve on error | |
459 | */ | |
460 | int (*set_mode)(struct udevice *bus, uint mode); | |
461 | ||
462 | /** | |
463 | * Get information on a chip select | |
464 | * | |
465 | * This is only called when the SPI uclass does not know about a | |
466 | * chip select, i.e. it has no attached device. It gives the driver | |
467 | * a chance to allow activity on that chip select even so. | |
468 | * | |
469 | * @bus: The SPI bus | |
470 | * @cs: The chip select (0..n-1) | |
471 | * @info: Returns information about the chip select, if valid. | |
472 | * On entry info->dev is NULL | |
473 | * @return 0 if OK (and @info is set up), -ENODEV if the chip select | |
474 | * is invalid, other -ve value on error | |
475 | */ | |
476 | int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info); | |
477 | }; | |
478 | ||
c60e1f25 SG |
479 | struct dm_spi_emul_ops { |
480 | /** | |
481 | * SPI transfer | |
482 | * | |
483 | * This writes "bitlen" bits out the SPI MOSI port and simultaneously | |
484 | * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI | |
485 | * works. Here the device is a slave. | |
486 | * | |
487 | * The source of the outgoing bits is the "dout" parameter and the | |
488 | * destination of the input bits is the "din" parameter. Note that | |
489 | * "dout" and "din" can point to the same memory location, in which | |
490 | * case the input data overwrites the output data (since both are | |
491 | * buffered by temporary variables, this is OK). | |
492 | * | |
493 | * spi_xfer() interface: | |
494 | * @slave: The SPI slave which will be sending/receiving the data. | |
495 | * @bitlen: How many bits to write and read. | |
496 | * @dout: Pointer to a string of bits sent to the device. The | |
497 | * bits are held in a byte array and are sent MSB first. | |
498 | * @din: Pointer to a string of bits that will be sent back to | |
499 | * the master. | |
500 | * @flags: A bitwise combination of SPI_XFER_* flags. | |
501 | * | |
502 | * Returns: 0 on success, not -1 on failure | |
503 | */ | |
504 | int (*xfer)(struct udevice *slave, unsigned int bitlen, | |
505 | const void *dout, void *din, unsigned long flags); | |
506 | }; | |
507 | ||
d7af6a48 SG |
508 | /** |
509 | * spi_find_bus_and_cs() - Find bus and slave devices by number | |
510 | * | |
511 | * Given a bus number and chip select, this finds the corresponding bus | |
512 | * device and slave device. Neither device is activated by this function, | |
513 | * although they may have been activated previously. | |
514 | * | |
515 | * @busnum: SPI bus number | |
516 | * @cs: Chip select to look for | |
517 | * @busp: Returns bus device | |
518 | * @devp: Return slave device | |
519 | * @return 0 if found, -ENODEV on error | |
520 | */ | |
521 | int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp, | |
522 | struct udevice **devp); | |
523 | ||
524 | /** | |
525 | * spi_get_bus_and_cs() - Find and activate bus and slave devices by number | |
526 | * | |
527 | * Given a bus number and chip select, this finds the corresponding bus | |
528 | * device and slave device. | |
529 | * | |
530 | * If no such slave exists, and drv_name is not NULL, then a new slave device | |
531 | * is automatically bound on this chip select. | |
532 | * | |
533 | * Ths new slave device is probed ready for use with the given speed and mode. | |
534 | * | |
535 | * @busnum: SPI bus number | |
536 | * @cs: Chip select to look for | |
537 | * @speed: SPI speed to use for this slave | |
538 | * @mode: SPI mode to use for this slave | |
539 | * @drv_name: Name of driver to attach to this chip select | |
540 | * @dev_name: Name of the new device thus created | |
541 | * @busp: Returns bus device | |
542 | * @devp: Return slave device | |
543 | * @return 0 if found, -ve on error | |
544 | */ | |
545 | int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode, | |
546 | const char *drv_name, const char *dev_name, | |
547 | struct udevice **busp, struct spi_slave **devp); | |
548 | ||
549 | /** | |
550 | * spi_chip_select() - Get the chip select for a slave | |
551 | * | |
552 | * @return the chip select this slave is attached to | |
553 | */ | |
554 | int spi_chip_select(struct udevice *slave); | |
555 | ||
ff56bba2 SG |
556 | /** |
557 | * spi_find_chip_select() - Find the slave attached to chip select | |
558 | * | |
559 | * @bus: SPI bus to search | |
560 | * @cs: Chip select to look for | |
561 | * @devp: Returns the slave device if found | |
562 | * @return 0 if found, -ENODEV on error | |
563 | */ | |
564 | int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp); | |
565 | ||
d7af6a48 | 566 | /** |
d0cff03e | 567 | * spi_slave_ofdata_to_platdata() - decode standard SPI platform data |
d7af6a48 | 568 | * |
d0cff03e | 569 | * This decodes the speed and mode for a slave from a device tree node |
d7af6a48 SG |
570 | * |
571 | * @blob: Device tree blob | |
572 | * @node: Node offset to read from | |
d0cff03e | 573 | * @plat: Place to put the decoded information |
d7af6a48 | 574 | */ |
d0cff03e SG |
575 | int spi_slave_ofdata_to_platdata(const void *blob, int node, |
576 | struct dm_spi_slave_platdata *plat); | |
d7af6a48 SG |
577 | |
578 | /** | |
579 | * spi_cs_info() - Check information on a chip select | |
580 | * | |
581 | * This checks a particular chip select on a bus to see if it has a device | |
582 | * attached, or is even valid. | |
583 | * | |
584 | * @bus: The SPI bus | |
585 | * @cs: The chip select (0..n-1) | |
586 | * @info: Returns information about the chip select, if valid | |
587 | * @return 0 if OK (and @info is set up), -ENODEV if the chip select | |
588 | * is invalid, other -ve value on error | |
589 | */ | |
590 | int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info); | |
591 | ||
592 | struct sandbox_state; | |
c60e1f25 SG |
593 | |
594 | /** | |
595 | * sandbox_spi_get_emul() - get an emulator for a SPI slave | |
596 | * | |
597 | * This provides a way to attach an emulated SPI device to a particular SPI | |
598 | * slave, so that xfer() operations on the slave will be handled by the | |
599 | * emulator. If a emulator already exists on that chip select it is returned. | |
600 | * Otherwise one is created. | |
601 | * | |
602 | * @state: Sandbox state | |
603 | * @bus: SPI bus requesting the emulator | |
604 | * @slave: SPI slave device requesting the emulator | |
605 | * @emuip: Returns pointer to emulator | |
606 | * @return 0 if OK, -ve on error | |
607 | */ | |
d7af6a48 SG |
608 | int sandbox_spi_get_emul(struct sandbox_state *state, |
609 | struct udevice *bus, struct udevice *slave, | |
610 | struct udevice **emulp); | |
611 | ||
bc5701e1 | 612 | /* Access the operations for a SPI device */ |
d7af6a48 | 613 | #define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops) |
c60e1f25 | 614 | #define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops) |
d7af6a48 SG |
615 | #endif /* CONFIG_DM_SPI */ |
616 | ||
77f85581 | 617 | #endif /* _SPI_H_ */ |