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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 | 26 | #define SPI_TX_BYTE BIT(8) /* transmit with 1 wire byte */ |
2b11a41c JT |
27 | #define SPI_TX_DUAL BIT(9) /* transmit with 2 wires */ |
28 | #define SPI_TX_QUAD BIT(10) /* transmit with 4 wires */ | |
08fe9c29 | 29 | #define SPI_RX_SLOW BIT(11) /* receive with 1 wire slow */ |
3ac48d0e JT |
30 | #define SPI_RX_DUAL BIT(12) /* receive with 2 wires */ |
31 | #define SPI_RX_QUAD BIT(13) /* receive with 4 wires */ | |
4e09cc1e | 32 | |
bb786b84 | 33 | /* Header byte that marks the start of the message */ |
ce22b922 | 34 | #define SPI_PREAMBLE_END_BYTE 0xec |
bb786b84 | 35 | |
5d69df35 | 36 | #define SPI_DEFAULT_WORDLEN 8 |
5753d09b | 37 | |
d7af6a48 | 38 | #ifdef CONFIG_DM_SPI |
d0cff03e | 39 | /* TODO(sjg@chromium.org): Remove this and use max_hz from struct spi_slave */ |
d7af6a48 SG |
40 | struct dm_spi_bus { |
41 | uint max_hz; | |
42 | }; | |
43 | ||
d0cff03e SG |
44 | /** |
45 | * struct dm_spi_platdata - platform data for all SPI slaves | |
46 | * | |
47 | * This describes a SPI slave, a child device of the SPI bus. To obtain this | |
48 | * struct from a spi_slave, use dev_get_parent_platdata(dev) or | |
49 | * dev_get_parent_platdata(slave->dev). | |
50 | * | |
51 | * This data is immuatable. Each time the device is probed, @max_hz and @mode | |
52 | * will be copied to struct spi_slave. | |
53 | * | |
54 | * @cs: Chip select number (0..n-1) | |
55 | * @max_hz: Maximum bus speed that this slave can tolerate | |
56 | * @mode: SPI mode to use for this device (see SPI mode flags) | |
57 | */ | |
58 | struct dm_spi_slave_platdata { | |
59 | unsigned int cs; | |
60 | uint max_hz; | |
61 | uint mode; | |
62 | }; | |
63 | ||
d7af6a48 SG |
64 | #endif /* CONFIG_DM_SPI */ |
65 | ||
1b1bd9a7 | 66 | /** |
ce22b922 | 67 | * struct spi_slave - Representation of a SPI slave |
d255bb0e | 68 | * |
d7af6a48 | 69 | * For driver model this is the per-child data used by the SPI bus. It can |
bcbe3d15 | 70 | * be accessed using dev_get_parent_priv() on the slave device. The SPI uclass |
d0cff03e SG |
71 | * sets uip per_child_auto_alloc_size to sizeof(struct spi_slave), and the |
72 | * driver should not override it. Two platform data fields (max_hz and mode) | |
73 | * are copied into this structure to provide an initial value. This allows | |
74 | * them to be changed, since we should never change platform data in drivers. | |
d255bb0e | 75 | * |
d7af6a48 SG |
76 | * If not using driver model, drivers are expected to extend this with |
77 | * controller-specific data. | |
78 | * | |
79 | * @dev: SPI slave device | |
80 | * @max_hz: Maximum speed for this slave | |
60e2809a SG |
81 | * @speed: Current bus speed. This is 0 until the bus is first |
82 | * claimed. | |
d7af6a48 SG |
83 | * @bus: ID of the bus that the slave is attached to. For |
84 | * driver model this is the sequence number of the SPI | |
85 | * bus (bus->seq) so does not need to be stored | |
ce22b922 | 86 | * @cs: ID of the chip select connected to the slave. |
f5c3c033 | 87 | * @mode: SPI mode to use for this slave (see SPI mode flags) |
5753d09b | 88 | * @wordlen: Size of SPI word in number of bits |
8af74edc ÁFR |
89 | * @max_read_size: If non-zero, the maximum number of bytes which can |
90 | * be read at once. | |
ce22b922 | 91 | * @max_write_size: If non-zero, the maximum number of bytes which can |
6c94bd12 | 92 | * be written at once. |
ce22b922 | 93 | * @memory_map: Address of read-only SPI flash access. |
f77f4691 | 94 | * @flags: Indication of SPI flags. |
d255bb0e HS |
95 | */ |
96 | struct spi_slave { | |
d7af6a48 SG |
97 | #ifdef CONFIG_DM_SPI |
98 | struct udevice *dev; /* struct spi_slave is dev->parentdata */ | |
99 | uint max_hz; | |
60e2809a | 100 | uint speed; |
d7af6a48 | 101 | #else |
1b1bd9a7 JT |
102 | unsigned int bus; |
103 | unsigned int cs; | |
d0cff03e | 104 | #endif |
f5c3c033 | 105 | uint mode; |
5753d09b | 106 | unsigned int wordlen; |
8af74edc | 107 | unsigned int max_read_size; |
0c456cee | 108 | unsigned int max_write_size; |
004f15b6 | 109 | void *memory_map; |
c40f6003 | 110 | |
f77f4691 | 111 | u8 flags; |
29ee0262 JT |
112 | #define SPI_XFER_BEGIN BIT(0) /* Assert CS before transfer */ |
113 | #define SPI_XFER_END BIT(1) /* Deassert CS after transfer */ | |
c40f6003 | 114 | #define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END) |
29ee0262 JT |
115 | #define SPI_XFER_MMAP BIT(2) /* Memory Mapped start */ |
116 | #define SPI_XFER_MMAP_END BIT(3) /* Memory Mapped End */ | |
d255bb0e | 117 | }; |
77f85581 | 118 | |
1b1bd9a7 | 119 | /** |
77f85581 | 120 | * Initialization, must be called once on start up. |
d255bb0e HS |
121 | * |
122 | * TODO: I don't think we really need this. | |
77f85581 WD |
123 | */ |
124 | void spi_init(void); | |
125 | ||
ba6c3ce9 SG |
126 | /** |
127 | * spi_do_alloc_slave - Allocate a new SPI slave (internal) | |
128 | * | |
129 | * Allocate and zero all fields in the spi slave, and set the bus/chip | |
130 | * select. Use the helper macro spi_alloc_slave() to call this. | |
131 | * | |
1b1bd9a7 JT |
132 | * @offset: Offset of struct spi_slave within slave structure. |
133 | * @size: Size of slave structure. | |
134 | * @bus: Bus ID of the slave chip. | |
135 | * @cs: Chip select ID of the slave chip on the specified bus. | |
ba6c3ce9 SG |
136 | */ |
137 | void *spi_do_alloc_slave(int offset, int size, unsigned int bus, | |
138 | unsigned int cs); | |
139 | ||
140 | /** | |
141 | * spi_alloc_slave - Allocate a new SPI slave | |
142 | * | |
143 | * Allocate and zero all fields in the spi slave, and set the bus/chip | |
144 | * select. | |
145 | * | |
1b1bd9a7 JT |
146 | * @_struct: Name of structure to allocate (e.g. struct tegra_spi). |
147 | * This structure must contain a member 'struct spi_slave *slave'. | |
148 | * @bus: Bus ID of the slave chip. | |
149 | * @cs: Chip select ID of the slave chip on the specified bus. | |
ba6c3ce9 SG |
150 | */ |
151 | #define spi_alloc_slave(_struct, bus, cs) \ | |
152 | spi_do_alloc_slave(offsetof(_struct, slave), \ | |
153 | sizeof(_struct), bus, cs) | |
154 | ||
155 | /** | |
156 | * spi_alloc_slave_base - Allocate a new SPI slave with no private data | |
157 | * | |
158 | * Allocate and zero all fields in the spi slave, and set the bus/chip | |
159 | * select. | |
160 | * | |
1b1bd9a7 JT |
161 | * @bus: Bus ID of the slave chip. |
162 | * @cs: Chip select ID of the slave chip on the specified bus. | |
ba6c3ce9 SG |
163 | */ |
164 | #define spi_alloc_slave_base(bus, cs) \ | |
165 | spi_do_alloc_slave(0, sizeof(struct spi_slave), bus, cs) | |
166 | ||
1b1bd9a7 | 167 | /** |
d255bb0e HS |
168 | * Set up communications parameters for a SPI slave. |
169 | * | |
170 | * This must be called once for each slave. Note that this function | |
171 | * usually doesn't touch any actual hardware, it only initializes the | |
172 | * contents of spi_slave so that the hardware can be easily | |
173 | * initialized later. | |
174 | * | |
1b1bd9a7 JT |
175 | * @bus: Bus ID of the slave chip. |
176 | * @cs: Chip select ID of the slave chip on the specified bus. | |
177 | * @max_hz: Maximum SCK rate in Hz. | |
178 | * @mode: Clock polarity, clock phase and other parameters. | |
d255bb0e HS |
179 | * |
180 | * Returns: A spi_slave reference that can be used in subsequent SPI | |
181 | * calls, or NULL if one or more of the parameters are not supported. | |
182 | */ | |
183 | struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, | |
184 | unsigned int max_hz, unsigned int mode); | |
185 | ||
1b1bd9a7 | 186 | /** |
d255bb0e HS |
187 | * Free any memory associated with a SPI slave. |
188 | * | |
1b1bd9a7 | 189 | * @slave: The SPI slave |
d255bb0e HS |
190 | */ |
191 | void spi_free_slave(struct spi_slave *slave); | |
192 | ||
1b1bd9a7 | 193 | /** |
d255bb0e HS |
194 | * Claim the bus and prepare it for communication with a given slave. |
195 | * | |
196 | * This must be called before doing any transfers with a SPI slave. It | |
197 | * will enable and initialize any SPI hardware as necessary, and make | |
198 | * sure that the SCK line is in the correct idle state. It is not | |
199 | * allowed to claim the same bus for several slaves without releasing | |
200 | * the bus in between. | |
201 | * | |
1b1bd9a7 | 202 | * @slave: The SPI slave |
d255bb0e HS |
203 | * |
204 | * Returns: 0 if the bus was claimed successfully, or a negative value | |
205 | * if it wasn't. | |
206 | */ | |
207 | int spi_claim_bus(struct spi_slave *slave); | |
208 | ||
1b1bd9a7 | 209 | /** |
d255bb0e HS |
210 | * Release the SPI bus |
211 | * | |
212 | * This must be called once for every call to spi_claim_bus() after | |
213 | * all transfers have finished. It may disable any SPI hardware as | |
214 | * appropriate. | |
215 | * | |
1b1bd9a7 | 216 | * @slave: The SPI slave |
d255bb0e HS |
217 | */ |
218 | void spi_release_bus(struct spi_slave *slave); | |
77f85581 | 219 | |
5753d09b NK |
220 | /** |
221 | * Set the word length for SPI transactions | |
222 | * | |
223 | * Set the word length (number of bits per word) for SPI transactions. | |
224 | * | |
225 | * @slave: The SPI slave | |
226 | * @wordlen: The number of bits in a word | |
227 | * | |
228 | * Returns: 0 on success, -1 on failure. | |
229 | */ | |
230 | int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen); | |
231 | ||
1b1bd9a7 | 232 | /** |
77f85581 WD |
233 | * SPI transfer |
234 | * | |
235 | * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks | |
236 | * "bitlen" bits in the SPI MISO port. That's just the way SPI works. | |
237 | * | |
238 | * The source of the outgoing bits is the "dout" parameter and the | |
239 | * destination of the input bits is the "din" parameter. Note that "dout" | |
240 | * and "din" can point to the same memory location, in which case the | |
241 | * input data overwrites the output data (since both are buffered by | |
242 | * temporary variables, this is OK). | |
243 | * | |
77f85581 | 244 | * spi_xfer() interface: |
1b1bd9a7 JT |
245 | * @slave: The SPI slave which will be sending/receiving the data. |
246 | * @bitlen: How many bits to write and read. | |
247 | * @dout: Pointer to a string of bits to send out. The bits are | |
d255bb0e | 248 | * held in a byte array and are sent MSB first. |
1b1bd9a7 JT |
249 | * @din: Pointer to a string of bits that will be filled in. |
250 | * @flags: A bitwise combination of SPI_XFER_* flags. | |
77f85581 | 251 | * |
1b1bd9a7 | 252 | * Returns: 0 on success, not 0 on failure |
77f85581 | 253 | */ |
d255bb0e HS |
254 | int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, |
255 | void *din, unsigned long flags); | |
256 | ||
146bad96 TR |
257 | /* Copy memory mapped data */ |
258 | void spi_flash_copy_mmap(void *data, void *offset, size_t len); | |
259 | ||
1b1bd9a7 | 260 | /** |
d255bb0e HS |
261 | * Determine if a SPI chipselect is valid. |
262 | * This function is provided by the board if the low-level SPI driver | |
263 | * needs it to determine if a given chipselect is actually valid. | |
264 | * | |
265 | * Returns: 1 if bus:cs identifies a valid chip on this board, 0 | |
266 | * otherwise. | |
267 | */ | |
d7af6a48 | 268 | int spi_cs_is_valid(unsigned int bus, unsigned int cs); |
d255bb0e | 269 | |
d7af6a48 | 270 | #ifndef CONFIG_DM_SPI |
1b1bd9a7 | 271 | /** |
d255bb0e HS |
272 | * Activate a SPI chipselect. |
273 | * This function is provided by the board code when using a driver | |
274 | * that can't control its chipselects automatically (e.g. | |
275 | * common/soft_spi.c). When called, it should activate the chip select | |
276 | * to the device identified by "slave". | |
277 | */ | |
278 | void spi_cs_activate(struct spi_slave *slave); | |
279 | ||
1b1bd9a7 | 280 | /** |
d255bb0e HS |
281 | * Deactivate a SPI chipselect. |
282 | * This function is provided by the board code when using a driver | |
283 | * that can't control its chipselects automatically (e.g. | |
284 | * common/soft_spi.c). When called, it should deactivate the chip | |
285 | * select to the device identified by "slave". | |
286 | */ | |
287 | void spi_cs_deactivate(struct spi_slave *slave); | |
288 | ||
1b1bd9a7 | 289 | /** |
fa1423e7 TC |
290 | * Set transfer speed. |
291 | * This sets a new speed to be applied for next spi_xfer(). | |
1b1bd9a7 JT |
292 | * @slave: The SPI slave |
293 | * @hz: The transfer speed | |
fa1423e7 TC |
294 | */ |
295 | void spi_set_speed(struct spi_slave *slave, uint hz); | |
d7af6a48 | 296 | #endif |
fa1423e7 | 297 | |
1b1bd9a7 | 298 | /** |
d255bb0e | 299 | * Write 8 bits, then read 8 bits. |
1b1bd9a7 JT |
300 | * @slave: The SPI slave we're communicating with |
301 | * @byte: Byte to be written | |
d255bb0e HS |
302 | * |
303 | * Returns: The value that was read, or a negative value on error. | |
304 | * | |
305 | * TODO: This function probably shouldn't be inlined. | |
306 | */ | |
307 | static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte) | |
308 | { | |
309 | unsigned char dout[2]; | |
310 | unsigned char din[2]; | |
311 | int ret; | |
312 | ||
313 | dout[0] = byte; | |
314 | dout[1] = 0; | |
38254f45 | 315 | |
d255bb0e HS |
316 | ret = spi_xfer(slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END); |
317 | return ret < 0 ? ret : din[1]; | |
318 | } | |
77f85581 | 319 | |
d7af6a48 SG |
320 | #ifdef CONFIG_DM_SPI |
321 | ||
322 | /** | |
323 | * struct spi_cs_info - Information about a bus chip select | |
324 | * | |
325 | * @dev: Connected device, or NULL if none | |
326 | */ | |
327 | struct spi_cs_info { | |
328 | struct udevice *dev; | |
329 | }; | |
330 | ||
331 | /** | |
332 | * struct struct dm_spi_ops - Driver model SPI operations | |
333 | * | |
334 | * The uclass interface is implemented by all SPI devices which use | |
335 | * driver model. | |
336 | */ | |
337 | struct dm_spi_ops { | |
338 | /** | |
339 | * Claim the bus and prepare it for communication. | |
340 | * | |
341 | * The device provided is the slave device. It's parent controller | |
342 | * will be used to provide the communication. | |
343 | * | |
344 | * This must be called before doing any transfers with a SPI slave. It | |
345 | * will enable and initialize any SPI hardware as necessary, and make | |
346 | * sure that the SCK line is in the correct idle state. It is not | |
347 | * allowed to claim the same bus for several slaves without releasing | |
348 | * the bus in between. | |
349 | * | |
9694b724 | 350 | * @dev: The SPI slave |
d7af6a48 SG |
351 | * |
352 | * Returns: 0 if the bus was claimed successfully, or a negative value | |
353 | * if it wasn't. | |
354 | */ | |
9694b724 | 355 | int (*claim_bus)(struct udevice *dev); |
d7af6a48 SG |
356 | |
357 | /** | |
358 | * Release the SPI bus | |
359 | * | |
360 | * This must be called once for every call to spi_claim_bus() after | |
361 | * all transfers have finished. It may disable any SPI hardware as | |
362 | * appropriate. | |
363 | * | |
9694b724 | 364 | * @dev: The SPI slave |
d7af6a48 | 365 | */ |
9694b724 | 366 | int (*release_bus)(struct udevice *dev); |
d7af6a48 SG |
367 | |
368 | /** | |
369 | * Set the word length for SPI transactions | |
370 | * | |
371 | * Set the word length (number of bits per word) for SPI transactions. | |
372 | * | |
373 | * @bus: The SPI slave | |
374 | * @wordlen: The number of bits in a word | |
375 | * | |
376 | * Returns: 0 on success, -ve on failure. | |
377 | */ | |
9694b724 | 378 | int (*set_wordlen)(struct udevice *dev, unsigned int wordlen); |
d7af6a48 SG |
379 | |
380 | /** | |
381 | * SPI transfer | |
382 | * | |
383 | * This writes "bitlen" bits out the SPI MOSI port and simultaneously | |
384 | * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI | |
385 | * works. | |
386 | * | |
387 | * The source of the outgoing bits is the "dout" parameter and the | |
388 | * destination of the input bits is the "din" parameter. Note that | |
389 | * "dout" and "din" can point to the same memory location, in which | |
390 | * case the input data overwrites the output data (since both are | |
391 | * buffered by temporary variables, this is OK). | |
392 | * | |
393 | * spi_xfer() interface: | |
394 | * @dev: The slave device to communicate with | |
395 | * @bitlen: How many bits to write and read. | |
396 | * @dout: Pointer to a string of bits to send out. The bits are | |
397 | * held in a byte array and are sent MSB first. | |
398 | * @din: Pointer to a string of bits that will be filled in. | |
399 | * @flags: A bitwise combination of SPI_XFER_* flags. | |
400 | * | |
401 | * Returns: 0 on success, not -1 on failure | |
402 | */ | |
403 | int (*xfer)(struct udevice *dev, unsigned int bitlen, const void *dout, | |
404 | void *din, unsigned long flags); | |
405 | ||
406 | /** | |
407 | * Set transfer speed. | |
408 | * This sets a new speed to be applied for next spi_xfer(). | |
409 | * @bus: The SPI bus | |
410 | * @hz: The transfer speed | |
411 | * @return 0 if OK, -ve on error | |
412 | */ | |
413 | int (*set_speed)(struct udevice *bus, uint hz); | |
414 | ||
415 | /** | |
416 | * Set the SPI mode/flags | |
417 | * | |
418 | * It is unclear if we want to set speed and mode together instead | |
419 | * of separately. | |
420 | * | |
421 | * @bus: The SPI bus | |
422 | * @mode: Requested SPI mode (SPI_... flags) | |
423 | * @return 0 if OK, -ve on error | |
424 | */ | |
425 | int (*set_mode)(struct udevice *bus, uint mode); | |
426 | ||
427 | /** | |
428 | * Get information on a chip select | |
429 | * | |
430 | * This is only called when the SPI uclass does not know about a | |
431 | * chip select, i.e. it has no attached device. It gives the driver | |
432 | * a chance to allow activity on that chip select even so. | |
433 | * | |
434 | * @bus: The SPI bus | |
435 | * @cs: The chip select (0..n-1) | |
436 | * @info: Returns information about the chip select, if valid. | |
437 | * On entry info->dev is NULL | |
438 | * @return 0 if OK (and @info is set up), -ENODEV if the chip select | |
439 | * is invalid, other -ve value on error | |
440 | */ | |
441 | int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info); | |
442 | }; | |
443 | ||
c60e1f25 SG |
444 | struct dm_spi_emul_ops { |
445 | /** | |
446 | * SPI transfer | |
447 | * | |
448 | * This writes "bitlen" bits out the SPI MOSI port and simultaneously | |
449 | * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI | |
450 | * works. Here the device is a slave. | |
451 | * | |
452 | * The source of the outgoing bits is the "dout" parameter and the | |
453 | * destination of the input bits is the "din" parameter. Note that | |
454 | * "dout" and "din" can point to the same memory location, in which | |
455 | * case the input data overwrites the output data (since both are | |
456 | * buffered by temporary variables, this is OK). | |
457 | * | |
458 | * spi_xfer() interface: | |
459 | * @slave: The SPI slave which will be sending/receiving the data. | |
460 | * @bitlen: How many bits to write and read. | |
461 | * @dout: Pointer to a string of bits sent to the device. The | |
462 | * bits are held in a byte array and are sent MSB first. | |
463 | * @din: Pointer to a string of bits that will be sent back to | |
464 | * the master. | |
465 | * @flags: A bitwise combination of SPI_XFER_* flags. | |
466 | * | |
467 | * Returns: 0 on success, not -1 on failure | |
468 | */ | |
469 | int (*xfer)(struct udevice *slave, unsigned int bitlen, | |
470 | const void *dout, void *din, unsigned long flags); | |
471 | }; | |
472 | ||
d7af6a48 SG |
473 | /** |
474 | * spi_find_bus_and_cs() - Find bus and slave devices by number | |
475 | * | |
476 | * Given a bus number and chip select, this finds the corresponding bus | |
477 | * device and slave device. Neither device is activated by this function, | |
478 | * although they may have been activated previously. | |
479 | * | |
480 | * @busnum: SPI bus number | |
481 | * @cs: Chip select to look for | |
482 | * @busp: Returns bus device | |
483 | * @devp: Return slave device | |
484 | * @return 0 if found, -ENODEV on error | |
485 | */ | |
486 | int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp, | |
487 | struct udevice **devp); | |
488 | ||
489 | /** | |
490 | * spi_get_bus_and_cs() - Find and activate bus and slave devices by number | |
491 | * | |
492 | * Given a bus number and chip select, this finds the corresponding bus | |
493 | * device and slave device. | |
494 | * | |
495 | * If no such slave exists, and drv_name is not NULL, then a new slave device | |
496 | * is automatically bound on this chip select. | |
497 | * | |
498 | * Ths new slave device is probed ready for use with the given speed and mode. | |
499 | * | |
500 | * @busnum: SPI bus number | |
501 | * @cs: Chip select to look for | |
502 | * @speed: SPI speed to use for this slave | |
503 | * @mode: SPI mode to use for this slave | |
504 | * @drv_name: Name of driver to attach to this chip select | |
505 | * @dev_name: Name of the new device thus created | |
506 | * @busp: Returns bus device | |
507 | * @devp: Return slave device | |
508 | * @return 0 if found, -ve on error | |
509 | */ | |
510 | int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode, | |
511 | const char *drv_name, const char *dev_name, | |
512 | struct udevice **busp, struct spi_slave **devp); | |
513 | ||
514 | /** | |
515 | * spi_chip_select() - Get the chip select for a slave | |
516 | * | |
517 | * @return the chip select this slave is attached to | |
518 | */ | |
519 | int spi_chip_select(struct udevice *slave); | |
520 | ||
ff56bba2 SG |
521 | /** |
522 | * spi_find_chip_select() - Find the slave attached to chip select | |
523 | * | |
524 | * @bus: SPI bus to search | |
525 | * @cs: Chip select to look for | |
526 | * @devp: Returns the slave device if found | |
527 | * @return 0 if found, -ENODEV on error | |
528 | */ | |
529 | int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp); | |
530 | ||
d7af6a48 | 531 | /** |
d0cff03e | 532 | * spi_slave_ofdata_to_platdata() - decode standard SPI platform data |
d7af6a48 | 533 | * |
d0cff03e | 534 | * This decodes the speed and mode for a slave from a device tree node |
d7af6a48 SG |
535 | * |
536 | * @blob: Device tree blob | |
537 | * @node: Node offset to read from | |
d0cff03e | 538 | * @plat: Place to put the decoded information |
d7af6a48 | 539 | */ |
279e26f5 | 540 | int spi_slave_ofdata_to_platdata(struct udevice *dev, |
d0cff03e | 541 | struct dm_spi_slave_platdata *plat); |
d7af6a48 SG |
542 | |
543 | /** | |
544 | * spi_cs_info() - Check information on a chip select | |
545 | * | |
546 | * This checks a particular chip select on a bus to see if it has a device | |
547 | * attached, or is even valid. | |
548 | * | |
549 | * @bus: The SPI bus | |
550 | * @cs: The chip select (0..n-1) | |
551 | * @info: Returns information about the chip select, if valid | |
552 | * @return 0 if OK (and @info is set up), -ENODEV if the chip select | |
553 | * is invalid, other -ve value on error | |
554 | */ | |
555 | int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info); | |
556 | ||
557 | struct sandbox_state; | |
c60e1f25 SG |
558 | |
559 | /** | |
560 | * sandbox_spi_get_emul() - get an emulator for a SPI slave | |
561 | * | |
562 | * This provides a way to attach an emulated SPI device to a particular SPI | |
563 | * slave, so that xfer() operations on the slave will be handled by the | |
564 | * emulator. If a emulator already exists on that chip select it is returned. | |
565 | * Otherwise one is created. | |
566 | * | |
567 | * @state: Sandbox state | |
568 | * @bus: SPI bus requesting the emulator | |
569 | * @slave: SPI slave device requesting the emulator | |
570 | * @emuip: Returns pointer to emulator | |
571 | * @return 0 if OK, -ve on error | |
572 | */ | |
d7af6a48 SG |
573 | int sandbox_spi_get_emul(struct sandbox_state *state, |
574 | struct udevice *bus, struct udevice *slave, | |
575 | struct udevice **emulp); | |
576 | ||
7a3eff4c PF |
577 | /** |
578 | * Claim the bus and prepare it for communication with a given slave. | |
579 | * | |
580 | * This must be called before doing any transfers with a SPI slave. It | |
581 | * will enable and initialize any SPI hardware as necessary, and make | |
582 | * sure that the SCK line is in the correct idle state. It is not | |
583 | * allowed to claim the same bus for several slaves without releasing | |
584 | * the bus in between. | |
585 | * | |
586 | * @dev: The SPI slave device | |
587 | * | |
588 | * Returns: 0 if the bus was claimed successfully, or a negative value | |
589 | * if it wasn't. | |
590 | */ | |
591 | int dm_spi_claim_bus(struct udevice *dev); | |
592 | ||
593 | /** | |
594 | * Release the SPI bus | |
595 | * | |
596 | * This must be called once for every call to dm_spi_claim_bus() after | |
597 | * all transfers have finished. It may disable any SPI hardware as | |
598 | * appropriate. | |
599 | * | |
600 | * @slave: The SPI slave device | |
601 | */ | |
602 | void dm_spi_release_bus(struct udevice *dev); | |
603 | ||
604 | /** | |
605 | * SPI transfer | |
606 | * | |
607 | * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks | |
608 | * "bitlen" bits in the SPI MISO port. That's just the way SPI works. | |
609 | * | |
610 | * The source of the outgoing bits is the "dout" parameter and the | |
611 | * destination of the input bits is the "din" parameter. Note that "dout" | |
612 | * and "din" can point to the same memory location, in which case the | |
613 | * input data overwrites the output data (since both are buffered by | |
614 | * temporary variables, this is OK). | |
615 | * | |
616 | * dm_spi_xfer() interface: | |
617 | * @dev: The SPI slave device which will be sending/receiving the data. | |
618 | * @bitlen: How many bits to write and read. | |
619 | * @dout: Pointer to a string of bits to send out. The bits are | |
620 | * held in a byte array and are sent MSB first. | |
621 | * @din: Pointer to a string of bits that will be filled in. | |
622 | * @flags: A bitwise combination of SPI_XFER_* flags. | |
623 | * | |
624 | * Returns: 0 on success, not 0 on failure | |
625 | */ | |
626 | int dm_spi_xfer(struct udevice *dev, unsigned int bitlen, | |
627 | const void *dout, void *din, unsigned long flags); | |
628 | ||
bc5701e1 | 629 | /* Access the operations for a SPI device */ |
d7af6a48 | 630 | #define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops) |
c60e1f25 | 631 | #define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops) |
d7af6a48 SG |
632 | #endif /* CONFIG_DM_SPI */ |
633 | ||
77f85581 | 634 | #endif /* _SPI_H_ */ |