blob: b4d27232ecb10dd3c240805dab08e0196b0d2835 [file] [log] [blame]
wdenk77f85582002-09-26 02:01:47 +00001/*
Jagannadha Sutradharudu Teki469146c2013-10-10 22:14:09 +05302 * Common SPI Interface: Controller-specific definitions
3 *
wdenk77f85582002-09-26 02:01:47 +00004 * (C) Copyright 2001
5 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
6 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02007 * SPDX-License-Identifier: GPL-2.0+
wdenk77f85582002-09-26 02:01:47 +00008 */
9
10#ifndef _SPI_H_
11#define _SPI_H_
12
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +020013/* SPI mode flags */
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)
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020020#define SPI_CS_HIGH 0x04 /* CS active high */
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +020021#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 */
Rajeshwari Shindebb786b82013-05-28 20:10:37 +000024#define SPI_SLAVE 0x40 /* slave mode */
25#define SPI_PREAMBLE 0x80 /* Skip preamble bytes */
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +020026
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020027/* SPI transfer flags */
Jagannadha Sutradharudu Tekice22b922013-10-07 19:34:56 +053028#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 */
Nikita Kiryanov47002192013-10-16 17:23:26 +030032#define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END)
Simon Glass248a0482014-09-15 06:33:23 -060033#define SPI_XFER_U_PAGE (1 << 5)
wdenk77f85582002-09-26 02:01:47 +000034
Jagannadha Sutradharudu Teki3163aaa2014-01-11 15:13:11 +053035/* SPI TX operation modes */
Simon Glass248a0482014-09-15 06:33:23 -060036#define SPI_OPM_TX_QPP (1 << 0)
Jagannadha Sutradharudu Teki54ba6532014-12-12 19:36:14 +053037#define SPI_OPM_TX_BP (1 << 1)
Jagannadha Sutradharudu Teki3163aaa2014-01-11 15:13:11 +053038
Jagannadha Sutradharudu Teki4e09cc12014-01-11 15:10:28 +053039/* SPI RX operation modes */
Simon Glass248a0482014-09-15 06:33:23 -060040#define SPI_OPM_RX_AS (1 << 0)
Siva Durga Prasad Paladugud2f76312015-03-11 14:52:42 +053041#define SPI_OPM_RX_AF (1 << 1)
42#define SPI_OPM_RX_DOUT (1 << 2)
43#define SPI_OPM_RX_DIO (1 << 3)
44#define SPI_OPM_RX_QOF (1 << 4)
45#define SPI_OPM_RX_QIOF (1 << 5)
46#define SPI_OPM_RX_EXTN (SPI_OPM_RX_AS | SPI_OPM_RX_AF | SPI_OPM_RX_DOUT | \
Jagannadha Sutradharudu Tekic4ba0d82013-12-24 15:24:31 +053047 SPI_OPM_RX_DIO | SPI_OPM_RX_QOF | \
Simon Glass248a0482014-09-15 06:33:23 -060048 SPI_OPM_RX_QIOF)
Jagannadha Sutradharudu Teki4e09cc12014-01-11 15:10:28 +053049
Simon Glass248a0482014-09-15 06:33:23 -060050/* SPI bus connection options - see enum spi_dual_flash */
51#define SPI_CONN_DUAL_SHARED (1 << 0)
52#define SPI_CONN_DUAL_SEPARATED (1 << 1)
Jagannadha Sutradharudu Tekif77f4692014-01-12 21:40:11 +053053
Rajeshwari Shindebb786b82013-05-28 20:10:37 +000054/* Header byte that marks the start of the message */
Jagannadha Sutradharudu Tekice22b922013-10-07 19:34:56 +053055#define SPI_PREAMBLE_END_BYTE 0xec
Rajeshwari Shindebb786b82013-05-28 20:10:37 +000056
Jagan Teki5d69df32015-06-27 00:51:30 +053057#define SPI_DEFAULT_WORDLEN 8
Nikita Kiryanov5753d092013-10-16 17:23:25 +030058
Simon Glassd7af6a42014-10-13 23:41:52 -060059#ifdef CONFIG_DM_SPI
Simon Glassd0cff032015-01-25 08:27:12 -070060/* TODO(sjg@chromium.org): Remove this and use max_hz from struct spi_slave */
Simon Glassd7af6a42014-10-13 23:41:52 -060061struct dm_spi_bus {
62 uint max_hz;
63};
64
Simon Glassd0cff032015-01-25 08:27:12 -070065/**
66 * struct dm_spi_platdata - platform data for all SPI slaves
67 *
68 * This describes a SPI slave, a child device of the SPI bus. To obtain this
69 * struct from a spi_slave, use dev_get_parent_platdata(dev) or
70 * dev_get_parent_platdata(slave->dev).
71 *
72 * This data is immuatable. Each time the device is probed, @max_hz and @mode
73 * will be copied to struct spi_slave.
74 *
75 * @cs: Chip select number (0..n-1)
76 * @max_hz: Maximum bus speed that this slave can tolerate
77 * @mode: SPI mode to use for this device (see SPI mode flags)
78 */
79struct dm_spi_slave_platdata {
80 unsigned int cs;
81 uint max_hz;
82 uint mode;
83};
84
Simon Glassd7af6a42014-10-13 23:41:52 -060085#endif /* CONFIG_DM_SPI */
86
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +053087/**
Jagannadha Sutradharudu Tekice22b922013-10-07 19:34:56 +053088 * struct spi_slave - Representation of a SPI slave
Haavard Skinnemoend255bb02008-05-16 11:10:31 +020089 *
Simon Glassd7af6a42014-10-13 23:41:52 -060090 * For driver model this is the per-child data used by the SPI bus. It can
Simon Glassbcbe3d12015-09-28 23:32:01 -060091 * be accessed using dev_get_parent_priv() on the slave device. The SPI uclass
Simon Glassd0cff032015-01-25 08:27:12 -070092 * sets uip per_child_auto_alloc_size to sizeof(struct spi_slave), and the
93 * driver should not override it. Two platform data fields (max_hz and mode)
94 * are copied into this structure to provide an initial value. This allows
95 * them to be changed, since we should never change platform data in drivers.
Simon Glassd7af6a42014-10-13 23:41:52 -060096 *
97 * If not using driver model, drivers are expected to extend this with
98 * controller-specific data.
99 *
100 * @dev: SPI slave device
101 * @max_hz: Maximum speed for this slave
102 * @mode: SPI mode to use for this slave (see SPI mode flags)
Simon Glass60e28092015-02-17 15:29:35 -0700103 * @speed: Current bus speed. This is 0 until the bus is first
104 * claimed.
Simon Glassd7af6a42014-10-13 23:41:52 -0600105 * @bus: ID of the bus that the slave is attached to. For
106 * driver model this is the sequence number of the SPI
107 * bus (bus->seq) so does not need to be stored
Jagannadha Sutradharudu Tekice22b922013-10-07 19:34:56 +0530108 * @cs: ID of the chip select connected to the slave.
Jagannadha Sutradharudu Teki4e09cc12014-01-11 15:10:28 +0530109 * @op_mode_rx: SPI RX operation mode.
Jagannadha Sutradharudu Teki3163aaa2014-01-11 15:13:11 +0530110 * @op_mode_tx: SPI TX operation mode.
Nikita Kiryanov5753d092013-10-16 17:23:25 +0300111 * @wordlen: Size of SPI word in number of bits
Jagannadha Sutradharudu Tekice22b922013-10-07 19:34:56 +0530112 * @max_write_size: If non-zero, the maximum number of bytes which can
113 * be written at once, excluding command bytes.
114 * @memory_map: Address of read-only SPI flash access.
Jagannadha Sutradharudu Teki056fbc72014-01-07 00:11:35 +0530115 * @option: Varies SPI bus options - separate, shared bus.
Jagannadha Sutradharudu Tekif77f4692014-01-12 21:40:11 +0530116 * @flags: Indication of SPI flags.
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200117 */
118struct spi_slave {
Simon Glassd7af6a42014-10-13 23:41:52 -0600119#ifdef CONFIG_DM_SPI
120 struct udevice *dev; /* struct spi_slave is dev->parentdata */
121 uint max_hz;
Simon Glass60e28092015-02-17 15:29:35 -0700122 uint speed;
Simon Glassd7af6a42014-10-13 23:41:52 -0600123 uint mode;
124#else
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530125 unsigned int bus;
126 unsigned int cs;
Simon Glassd0cff032015-01-25 08:27:12 -0700127#endif
Jagannadha Sutradharudu Teki4e09cc12014-01-11 15:10:28 +0530128 u8 op_mode_rx;
Jagannadha Sutradharudu Teki3163aaa2014-01-11 15:13:11 +0530129 u8 op_mode_tx;
Nikita Kiryanov5753d092013-10-16 17:23:25 +0300130 unsigned int wordlen;
Simon Glass0c456ce2013-03-11 06:08:05 +0000131 unsigned int max_write_size;
Poddar, Sourav004f15b2013-10-07 15:53:01 +0530132 void *memory_map;
Jagannadha Sutradharudu Tekif77f4692014-01-12 21:40:11 +0530133 u8 option;
134 u8 flags;
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200135};
wdenk77f85582002-09-26 02:01:47 +0000136
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530137/**
wdenk77f85582002-09-26 02:01:47 +0000138 * Initialization, must be called once on start up.
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200139 *
140 * TODO: I don't think we really need this.
wdenk77f85582002-09-26 02:01:47 +0000141 */
142void spi_init(void);
143
Simon Glassba6c3ce2013-03-11 06:08:00 +0000144/**
145 * spi_do_alloc_slave - Allocate a new SPI slave (internal)
146 *
147 * Allocate and zero all fields in the spi slave, and set the bus/chip
148 * select. Use the helper macro spi_alloc_slave() to call this.
149 *
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530150 * @offset: Offset of struct spi_slave within slave structure.
151 * @size: Size of slave structure.
152 * @bus: Bus ID of the slave chip.
153 * @cs: Chip select ID of the slave chip on the specified bus.
Simon Glassba6c3ce2013-03-11 06:08:00 +0000154 */
155void *spi_do_alloc_slave(int offset, int size, unsigned int bus,
156 unsigned int cs);
157
158/**
159 * spi_alloc_slave - Allocate a new SPI slave
160 *
161 * Allocate and zero all fields in the spi slave, and set the bus/chip
162 * select.
163 *
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530164 * @_struct: Name of structure to allocate (e.g. struct tegra_spi).
165 * This structure must contain a member 'struct spi_slave *slave'.
166 * @bus: Bus ID of the slave chip.
167 * @cs: Chip select ID of the slave chip on the specified bus.
Simon Glassba6c3ce2013-03-11 06:08:00 +0000168 */
169#define spi_alloc_slave(_struct, bus, cs) \
170 spi_do_alloc_slave(offsetof(_struct, slave), \
171 sizeof(_struct), bus, cs)
172
173/**
174 * spi_alloc_slave_base - Allocate a new SPI slave with no private data
175 *
176 * Allocate and zero all fields in the spi slave, and set the bus/chip
177 * select.
178 *
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530179 * @bus: Bus ID of the slave chip.
180 * @cs: Chip select ID of the slave chip on the specified bus.
Simon Glassba6c3ce2013-03-11 06:08:00 +0000181 */
182#define spi_alloc_slave_base(bus, cs) \
183 spi_do_alloc_slave(0, sizeof(struct spi_slave), bus, cs)
184
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530185/**
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200186 * Set up communications parameters for a SPI slave.
187 *
188 * This must be called once for each slave. Note that this function
189 * usually doesn't touch any actual hardware, it only initializes the
190 * contents of spi_slave so that the hardware can be easily
191 * initialized later.
192 *
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530193 * @bus: Bus ID of the slave chip.
194 * @cs: Chip select ID of the slave chip on the specified bus.
195 * @max_hz: Maximum SCK rate in Hz.
196 * @mode: Clock polarity, clock phase and other parameters.
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200197 *
198 * Returns: A spi_slave reference that can be used in subsequent SPI
199 * calls, or NULL if one or more of the parameters are not supported.
200 */
201struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
202 unsigned int max_hz, unsigned int mode);
203
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530204/**
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200205 * Free any memory associated with a SPI slave.
206 *
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530207 * @slave: The SPI slave
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200208 */
209void spi_free_slave(struct spi_slave *slave);
210
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530211/**
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200212 * Claim the bus and prepare it for communication with a given slave.
213 *
214 * This must be called before doing any transfers with a SPI slave. It
215 * will enable and initialize any SPI hardware as necessary, and make
216 * sure that the SCK line is in the correct idle state. It is not
217 * allowed to claim the same bus for several slaves without releasing
218 * the bus in between.
219 *
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530220 * @slave: The SPI slave
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200221 *
222 * Returns: 0 if the bus was claimed successfully, or a negative value
223 * if it wasn't.
224 */
225int spi_claim_bus(struct spi_slave *slave);
226
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530227/**
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200228 * Release the SPI bus
229 *
230 * This must be called once for every call to spi_claim_bus() after
231 * all transfers have finished. It may disable any SPI hardware as
232 * appropriate.
233 *
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530234 * @slave: The SPI slave
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200235 */
236void spi_release_bus(struct spi_slave *slave);
wdenk77f85582002-09-26 02:01:47 +0000237
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530238/**
Nikita Kiryanov5753d092013-10-16 17:23:25 +0300239 * Set the word length for SPI transactions
240 *
241 * Set the word length (number of bits per word) for SPI transactions.
242 *
243 * @slave: The SPI slave
244 * @wordlen: The number of bits in a word
245 *
246 * Returns: 0 on success, -1 on failure.
247 */
248int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
249
250/**
wdenk77f85582002-09-26 02:01:47 +0000251 * SPI transfer
252 *
253 * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
254 * "bitlen" bits in the SPI MISO port. That's just the way SPI works.
255 *
256 * The source of the outgoing bits is the "dout" parameter and the
257 * destination of the input bits is the "din" parameter. Note that "dout"
258 * and "din" can point to the same memory location, in which case the
259 * input data overwrites the output data (since both are buffered by
260 * temporary variables, this is OK).
261 *
wdenk77f85582002-09-26 02:01:47 +0000262 * spi_xfer() interface:
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530263 * @slave: The SPI slave which will be sending/receiving the data.
264 * @bitlen: How many bits to write and read.
265 * @dout: Pointer to a string of bits to send out. The bits are
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200266 * held in a byte array and are sent MSB first.
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530267 * @din: Pointer to a string of bits that will be filled in.
268 * @flags: A bitwise combination of SPI_XFER_* flags.
wdenk77f85582002-09-26 02:01:47 +0000269 *
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530270 * Returns: 0 on success, not 0 on failure
wdenk77f85582002-09-26 02:01:47 +0000271 */
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200272int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
273 void *din, unsigned long flags);
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +0200274
Tom Rini146bad92015-08-17 13:29:54 +0530275/* Copy memory mapped data */
276void spi_flash_copy_mmap(void *data, void *offset, size_t len);
277
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530278/**
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200279 * Determine if a SPI chipselect is valid.
280 * This function is provided by the board if the low-level SPI driver
281 * needs it to determine if a given chipselect is actually valid.
282 *
283 * Returns: 1 if bus:cs identifies a valid chip on this board, 0
284 * otherwise.
285 */
Simon Glassd7af6a42014-10-13 23:41:52 -0600286int spi_cs_is_valid(unsigned int bus, unsigned int cs);
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200287
Simon Glassd7af6a42014-10-13 23:41:52 -0600288#ifndef CONFIG_DM_SPI
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530289/**
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200290 * Activate a SPI chipselect.
291 * This function is provided by the board code when using a driver
292 * that can't control its chipselects automatically (e.g.
293 * common/soft_spi.c). When called, it should activate the chip select
294 * to the device identified by "slave".
295 */
296void spi_cs_activate(struct spi_slave *slave);
297
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530298/**
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200299 * Deactivate a SPI chipselect.
300 * This function is provided by the board code when using a driver
301 * that can't control its chipselects automatically (e.g.
302 * common/soft_spi.c). When called, it should deactivate the chip
303 * select to the device identified by "slave".
304 */
305void spi_cs_deactivate(struct spi_slave *slave);
306
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530307/**
Thomas Choufa1423e2010-12-24 15:16:07 +0800308 * Set transfer speed.
309 * This sets a new speed to be applied for next spi_xfer().
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530310 * @slave: The SPI slave
311 * @hz: The transfer speed
Thomas Choufa1423e2010-12-24 15:16:07 +0800312 */
313void spi_set_speed(struct spi_slave *slave, uint hz);
Simon Glassd7af6a42014-10-13 23:41:52 -0600314#endif
Thomas Choufa1423e2010-12-24 15:16:07 +0800315
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530316/**
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200317 * Write 8 bits, then read 8 bits.
Jagannadha Sutradharudu Teki1b1bd9a2013-09-25 15:47:36 +0530318 * @slave: The SPI slave we're communicating with
319 * @byte: Byte to be written
Haavard Skinnemoend255bb02008-05-16 11:10:31 +0200320 *
321 * Returns: The value that was read, or a negative value on error.
322 *
323 * TODO: This function probably shouldn't be inlined.
324 */
325static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte)
326{
327 unsigned char dout[2];
328 unsigned char din[2];
329 int ret;
330
331 dout[0] = byte;
332 dout[1] = 0;
333
334 ret = spi_xfer(slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END);
335 return ret < 0 ? ret : din[1];
336}
wdenk77f85582002-09-26 02:01:47 +0000337
Hung-ying Tyanf3424c52013-05-15 18:27:30 +0800338/**
339 * Set up a SPI slave for a particular device tree node
340 *
341 * This calls spi_setup_slave() with the correct bus number. Call
342 * spi_free_slave() to free it later.
343 *
Jagannadha Sutradharudu Teki469146c2013-10-10 22:14:09 +0530344 * @param blob: Device tree blob
Simon Glass0efc0242013-12-03 16:43:24 -0700345 * @param slave_node: Slave node to use
346 * @param spi_node: SPI peripheral node to use
Hung-ying Tyanf3424c52013-05-15 18:27:30 +0800347 * @return pointer to new spi_slave structure
348 */
Simon Glass0efc0242013-12-03 16:43:24 -0700349struct spi_slave *spi_setup_slave_fdt(const void *blob, int slave_node,
350 int spi_node);
351
352/**
353 * spi_base_setup_slave_fdt() - helper function to set up a SPI slace
354 *
355 * This decodes SPI properties from the slave node to determine the
356 * chip select and SPI parameters.
357 *
358 * @blob: Device tree blob
359 * @busnum: Bus number to use
360 * @node: Device tree node for the SPI bus
361 */
362struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum,
363 int node);
Hung-ying Tyanf3424c52013-05-15 18:27:30 +0800364
Simon Glassd7af6a42014-10-13 23:41:52 -0600365#ifdef CONFIG_DM_SPI
366
367/**
368 * struct spi_cs_info - Information about a bus chip select
369 *
370 * @dev: Connected device, or NULL if none
371 */
372struct spi_cs_info {
373 struct udevice *dev;
374};
375
376/**
377 * struct struct dm_spi_ops - Driver model SPI operations
378 *
379 * The uclass interface is implemented by all SPI devices which use
380 * driver model.
381 */
382struct dm_spi_ops {
383 /**
384 * Claim the bus and prepare it for communication.
385 *
386 * The device provided is the slave device. It's parent controller
387 * will be used to provide the communication.
388 *
389 * This must be called before doing any transfers with a SPI slave. It
390 * will enable and initialize any SPI hardware as necessary, and make
391 * sure that the SCK line is in the correct idle state. It is not
392 * allowed to claim the same bus for several slaves without releasing
393 * the bus in between.
394 *
Simon Glass9694b722015-04-19 09:05:40 -0600395 * @dev: The SPI slave
Simon Glassd7af6a42014-10-13 23:41:52 -0600396 *
397 * Returns: 0 if the bus was claimed successfully, or a negative value
398 * if it wasn't.
399 */
Simon Glass9694b722015-04-19 09:05:40 -0600400 int (*claim_bus)(struct udevice *dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600401
402 /**
403 * Release the SPI bus
404 *
405 * This must be called once for every call to spi_claim_bus() after
406 * all transfers have finished. It may disable any SPI hardware as
407 * appropriate.
408 *
Simon Glass9694b722015-04-19 09:05:40 -0600409 * @dev: The SPI slave
Simon Glassd7af6a42014-10-13 23:41:52 -0600410 */
Simon Glass9694b722015-04-19 09:05:40 -0600411 int (*release_bus)(struct udevice *dev);
Simon Glassd7af6a42014-10-13 23:41:52 -0600412
413 /**
414 * Set the word length for SPI transactions
415 *
416 * Set the word length (number of bits per word) for SPI transactions.
417 *
418 * @bus: The SPI slave
419 * @wordlen: The number of bits in a word
420 *
421 * Returns: 0 on success, -ve on failure.
422 */
Simon Glass9694b722015-04-19 09:05:40 -0600423 int (*set_wordlen)(struct udevice *dev, unsigned int wordlen);
Simon Glassd7af6a42014-10-13 23:41:52 -0600424
425 /**
426 * SPI transfer
427 *
428 * This writes "bitlen" bits out the SPI MOSI port and simultaneously
429 * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI
430 * works.
431 *
432 * The source of the outgoing bits is the "dout" parameter and the
433 * destination of the input bits is the "din" parameter. Note that
434 * "dout" and "din" can point to the same memory location, in which
435 * case the input data overwrites the output data (since both are
436 * buffered by temporary variables, this is OK).
437 *
438 * spi_xfer() interface:
439 * @dev: The slave device to communicate with
440 * @bitlen: How many bits to write and read.
441 * @dout: Pointer to a string of bits to send out. The bits are
442 * held in a byte array and are sent MSB first.
443 * @din: Pointer to a string of bits that will be filled in.
444 * @flags: A bitwise combination of SPI_XFER_* flags.
445 *
446 * Returns: 0 on success, not -1 on failure
447 */
448 int (*xfer)(struct udevice *dev, unsigned int bitlen, const void *dout,
449 void *din, unsigned long flags);
450
451 /**
452 * Set transfer speed.
453 * This sets a new speed to be applied for next spi_xfer().
454 * @bus: The SPI bus
455 * @hz: The transfer speed
456 * @return 0 if OK, -ve on error
457 */
458 int (*set_speed)(struct udevice *bus, uint hz);
459
460 /**
461 * Set the SPI mode/flags
462 *
463 * It is unclear if we want to set speed and mode together instead
464 * of separately.
465 *
466 * @bus: The SPI bus
467 * @mode: Requested SPI mode (SPI_... flags)
468 * @return 0 if OK, -ve on error
469 */
470 int (*set_mode)(struct udevice *bus, uint mode);
471
472 /**
473 * Get information on a chip select
474 *
475 * This is only called when the SPI uclass does not know about a
476 * chip select, i.e. it has no attached device. It gives the driver
477 * a chance to allow activity on that chip select even so.
478 *
479 * @bus: The SPI bus
480 * @cs: The chip select (0..n-1)
481 * @info: Returns information about the chip select, if valid.
482 * On entry info->dev is NULL
483 * @return 0 if OK (and @info is set up), -ENODEV if the chip select
484 * is invalid, other -ve value on error
485 */
486 int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info);
487};
488
Simon Glassc60e1f22014-10-13 23:41:53 -0600489struct dm_spi_emul_ops {
490 /**
491 * SPI transfer
492 *
493 * This writes "bitlen" bits out the SPI MOSI port and simultaneously
494 * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI
495 * works. Here the device is a slave.
496 *
497 * The source of the outgoing bits is the "dout" parameter and the
498 * destination of the input bits is the "din" parameter. Note that
499 * "dout" and "din" can point to the same memory location, in which
500 * case the input data overwrites the output data (since both are
501 * buffered by temporary variables, this is OK).
502 *
503 * spi_xfer() interface:
504 * @slave: The SPI slave which will be sending/receiving the data.
505 * @bitlen: How many bits to write and read.
506 * @dout: Pointer to a string of bits sent to the device. The
507 * bits are held in a byte array and are sent MSB first.
508 * @din: Pointer to a string of bits that will be sent back to
509 * the master.
510 * @flags: A bitwise combination of SPI_XFER_* flags.
511 *
512 * Returns: 0 on success, not -1 on failure
513 */
514 int (*xfer)(struct udevice *slave, unsigned int bitlen,
515 const void *dout, void *din, unsigned long flags);
516};
517
Simon Glassd7af6a42014-10-13 23:41:52 -0600518/**
519 * spi_find_bus_and_cs() - Find bus and slave devices by number
520 *
521 * Given a bus number and chip select, this finds the corresponding bus
522 * device and slave device. Neither device is activated by this function,
523 * although they may have been activated previously.
524 *
525 * @busnum: SPI bus number
526 * @cs: Chip select to look for
527 * @busp: Returns bus device
528 * @devp: Return slave device
529 * @return 0 if found, -ENODEV on error
530 */
531int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp,
532 struct udevice **devp);
533
534/**
535 * spi_get_bus_and_cs() - Find and activate bus and slave devices by number
536 *
537 * Given a bus number and chip select, this finds the corresponding bus
538 * device and slave device.
539 *
540 * If no such slave exists, and drv_name is not NULL, then a new slave device
541 * is automatically bound on this chip select.
542 *
543 * Ths new slave device is probed ready for use with the given speed and mode.
544 *
545 * @busnum: SPI bus number
546 * @cs: Chip select to look for
547 * @speed: SPI speed to use for this slave
548 * @mode: SPI mode to use for this slave
549 * @drv_name: Name of driver to attach to this chip select
550 * @dev_name: Name of the new device thus created
551 * @busp: Returns bus device
552 * @devp: Return slave device
553 * @return 0 if found, -ve on error
554 */
555int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
556 const char *drv_name, const char *dev_name,
557 struct udevice **busp, struct spi_slave **devp);
558
559/**
560 * spi_chip_select() - Get the chip select for a slave
561 *
562 * @return the chip select this slave is attached to
563 */
564int spi_chip_select(struct udevice *slave);
565
566/**
Simon Glassff56bba2014-11-11 10:46:22 -0700567 * spi_find_chip_select() - Find the slave attached to chip select
568 *
569 * @bus: SPI bus to search
570 * @cs: Chip select to look for
571 * @devp: Returns the slave device if found
572 * @return 0 if found, -ENODEV on error
573 */
574int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp);
575
576/**
Simon Glassd0cff032015-01-25 08:27:12 -0700577 * spi_slave_ofdata_to_platdata() - decode standard SPI platform data
Simon Glassd7af6a42014-10-13 23:41:52 -0600578 *
Simon Glassd0cff032015-01-25 08:27:12 -0700579 * This decodes the speed and mode for a slave from a device tree node
Simon Glassd7af6a42014-10-13 23:41:52 -0600580 *
581 * @blob: Device tree blob
582 * @node: Node offset to read from
Simon Glassd0cff032015-01-25 08:27:12 -0700583 * @plat: Place to put the decoded information
Simon Glassd7af6a42014-10-13 23:41:52 -0600584 */
Simon Glassd0cff032015-01-25 08:27:12 -0700585int spi_slave_ofdata_to_platdata(const void *blob, int node,
586 struct dm_spi_slave_platdata *plat);
Simon Glassd7af6a42014-10-13 23:41:52 -0600587
588/**
589 * spi_cs_info() - Check information on a chip select
590 *
591 * This checks a particular chip select on a bus to see if it has a device
592 * attached, or is even valid.
593 *
594 * @bus: The SPI bus
595 * @cs: The chip select (0..n-1)
596 * @info: Returns information about the chip select, if valid
597 * @return 0 if OK (and @info is set up), -ENODEV if the chip select
598 * is invalid, other -ve value on error
599 */
600int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info);
601
602struct sandbox_state;
Simon Glassc60e1f22014-10-13 23:41:53 -0600603
604/**
605 * sandbox_spi_get_emul() - get an emulator for a SPI slave
606 *
607 * This provides a way to attach an emulated SPI device to a particular SPI
608 * slave, so that xfer() operations on the slave will be handled by the
609 * emulator. If a emulator already exists on that chip select it is returned.
610 * Otherwise one is created.
611 *
612 * @state: Sandbox state
613 * @bus: SPI bus requesting the emulator
614 * @slave: SPI slave device requesting the emulator
615 * @emuip: Returns pointer to emulator
616 * @return 0 if OK, -ve on error
617 */
Simon Glassd7af6a42014-10-13 23:41:52 -0600618int sandbox_spi_get_emul(struct sandbox_state *state,
619 struct udevice *bus, struct udevice *slave,
620 struct udevice **emulp);
621
Simon Glassbc5701e2015-04-20 12:37:12 -0600622/* Access the operations for a SPI device */
Simon Glassd7af6a42014-10-13 23:41:52 -0600623#define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops)
Simon Glassc60e1f22014-10-13 23:41:53 -0600624#define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops)
Simon Glassd7af6a42014-10-13 23:41:52 -0600625#endif /* CONFIG_DM_SPI */
626
wdenk77f85582002-09-26 02:01:47 +0000627#endif /* _SPI_H_ */