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633 lines
20 KiB
633 lines
20 KiB
/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* |
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* Common SPI Interface: Controller-specific definitions |
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* |
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* (C) Copyright 2001 |
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* Gerald Van Baren, Custom IDEAS, [email protected]. |
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*/ |
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#ifndef _SPI_H_ |
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#define _SPI_H_ |
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|
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/* SPI mode flags */ |
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#define SPI_CPHA BIT(0) /* clock phase */ |
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#define SPI_CPOL BIT(1) /* clock polarity */ |
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#define SPI_MODE_0 (0|0) /* (original MicroWire) */ |
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#define SPI_MODE_1 (0|SPI_CPHA) |
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#define SPI_MODE_2 (SPI_CPOL|0) |
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#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA) |
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#define SPI_CS_HIGH BIT(2) /* CS active high */ |
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#define SPI_LSB_FIRST BIT(3) /* per-word bits-on-wire */ |
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#define SPI_3WIRE BIT(4) /* SI/SO signals shared */ |
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#define SPI_LOOP BIT(5) /* loopback mode */ |
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#define SPI_SLAVE BIT(6) /* slave mode */ |
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#define SPI_PREAMBLE BIT(7) /* Skip preamble bytes */ |
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#define SPI_TX_BYTE BIT(8) /* transmit with 1 wire byte */ |
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#define SPI_TX_DUAL BIT(9) /* transmit with 2 wires */ |
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#define SPI_TX_QUAD BIT(10) /* transmit with 4 wires */ |
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#define SPI_RX_SLOW BIT(11) /* receive with 1 wire slow */ |
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#define SPI_RX_DUAL BIT(12) /* receive with 2 wires */ |
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#define SPI_RX_QUAD BIT(13) /* receive with 4 wires */ |
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/* Header byte that marks the start of the message */ |
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#define SPI_PREAMBLE_END_BYTE 0xec |
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#define SPI_DEFAULT_WORDLEN 8 |
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#ifdef CONFIG_DM_SPI |
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/* TODO([email protected]): Remove this and use max_hz from struct spi_slave */ |
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struct dm_spi_bus { |
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uint max_hz; |
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}; |
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/** |
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* struct dm_spi_platdata - platform data for all SPI slaves |
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* |
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* This describes a SPI slave, a child device of the SPI bus. To obtain this |
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* struct from a spi_slave, use dev_get_parent_platdata(dev) or |
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* dev_get_parent_platdata(slave->dev). |
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* |
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* This data is immuatable. Each time the device is probed, @max_hz and @mode |
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* will be copied to struct spi_slave. |
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* |
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* @cs: Chip select number (0..n-1) |
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* @max_hz: Maximum bus speed that this slave can tolerate |
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* @mode: SPI mode to use for this device (see SPI mode flags) |
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*/ |
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struct dm_spi_slave_platdata { |
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unsigned int cs; |
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uint max_hz; |
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uint mode; |
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}; |
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#endif /* CONFIG_DM_SPI */ |
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/** |
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* struct spi_slave - Representation of a SPI slave |
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* |
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* For driver model this is the per-child data used by the SPI bus. It can |
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* be accessed using dev_get_parent_priv() on the slave device. The SPI uclass |
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* sets uip per_child_auto_alloc_size to sizeof(struct spi_slave), and the |
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* driver should not override it. Two platform data fields (max_hz and mode) |
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* are copied into this structure to provide an initial value. This allows |
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* them to be changed, since we should never change platform data in drivers. |
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* |
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* If not using driver model, drivers are expected to extend this with |
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* controller-specific data. |
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* |
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* @dev: SPI slave device |
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* @max_hz: Maximum speed for this slave |
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* @speed: Current bus speed. This is 0 until the bus is first |
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* claimed. |
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* @bus: ID of the bus that the slave is attached to. For |
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* driver model this is the sequence number of the SPI |
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* bus (bus->seq) so does not need to be stored |
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* @cs: ID of the chip select connected to the slave. |
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* @mode: SPI mode to use for this slave (see SPI mode flags) |
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* @wordlen: Size of SPI word in number of bits |
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* @max_read_size: If non-zero, the maximum number of bytes which can |
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* be read at once. |
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* @max_write_size: If non-zero, the maximum number of bytes which can |
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* be written at once. |
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* @memory_map: Address of read-only SPI flash access. |
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* @flags: Indication of SPI flags. |
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*/ |
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struct spi_slave { |
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#ifdef CONFIG_DM_SPI |
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struct udevice *dev; /* struct spi_slave is dev->parentdata */ |
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uint max_hz; |
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uint speed; |
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#else |
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unsigned int bus; |
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unsigned int cs; |
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#endif |
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uint mode; |
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unsigned int wordlen; |
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unsigned int max_read_size; |
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unsigned int max_write_size; |
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void *memory_map; |
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u8 flags; |
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#define SPI_XFER_BEGIN BIT(0) /* Assert CS before transfer */ |
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#define SPI_XFER_END BIT(1) /* Deassert CS after transfer */ |
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#define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END) |
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#define SPI_XFER_MMAP BIT(2) /* Memory Mapped start */ |
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#define SPI_XFER_MMAP_END BIT(3) /* Memory Mapped End */ |
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}; |
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/** |
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* Initialization, must be called once on start up. |
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* |
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* TODO: I don't think we really need this. |
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*/ |
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void spi_init(void); |
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/** |
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* spi_do_alloc_slave - Allocate a new SPI slave (internal) |
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* |
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* Allocate and zero all fields in the spi slave, and set the bus/chip |
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* select. Use the helper macro spi_alloc_slave() to call this. |
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* |
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* @offset: Offset of struct spi_slave within slave structure. |
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* @size: Size of slave structure. |
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* @bus: Bus ID of the slave chip. |
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* @cs: Chip select ID of the slave chip on the specified bus. |
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*/ |
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void *spi_do_alloc_slave(int offset, int size, unsigned int bus, |
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unsigned int cs); |
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/** |
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* spi_alloc_slave - Allocate a new SPI slave |
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* |
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* Allocate and zero all fields in the spi slave, and set the bus/chip |
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* select. |
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* |
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* @_struct: Name of structure to allocate (e.g. struct tegra_spi). |
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* This structure must contain a member 'struct spi_slave *slave'. |
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* @bus: Bus ID of the slave chip. |
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* @cs: Chip select ID of the slave chip on the specified bus. |
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*/ |
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#define spi_alloc_slave(_struct, bus, cs) \ |
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spi_do_alloc_slave(offsetof(_struct, slave), \ |
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sizeof(_struct), bus, cs) |
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/** |
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* spi_alloc_slave_base - Allocate a new SPI slave with no private data |
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* |
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* Allocate and zero all fields in the spi slave, and set the bus/chip |
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* select. |
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* |
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* @bus: Bus ID of the slave chip. |
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* @cs: Chip select ID of the slave chip on the specified bus. |
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*/ |
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#define spi_alloc_slave_base(bus, cs) \ |
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spi_do_alloc_slave(0, sizeof(struct spi_slave), bus, cs) |
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/** |
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* Set up communications parameters for a SPI slave. |
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* |
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* This must be called once for each slave. Note that this function |
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* usually doesn't touch any actual hardware, it only initializes the |
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* contents of spi_slave so that the hardware can be easily |
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* initialized later. |
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* |
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* @bus: Bus ID of the slave chip. |
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* @cs: Chip select ID of the slave chip on the specified bus. |
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* @max_hz: Maximum SCK rate in Hz. |
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* @mode: Clock polarity, clock phase and other parameters. |
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* |
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* Returns: A spi_slave reference that can be used in subsequent SPI |
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* calls, or NULL if one or more of the parameters are not supported. |
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*/ |
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struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, |
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unsigned int max_hz, unsigned int mode); |
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/** |
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* Free any memory associated with a SPI slave. |
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* |
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* @slave: The SPI slave |
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*/ |
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void spi_free_slave(struct spi_slave *slave); |
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/** |
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* Claim the bus and prepare it for communication with a given slave. |
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* |
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* This must be called before doing any transfers with a SPI slave. It |
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* will enable and initialize any SPI hardware as necessary, and make |
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* sure that the SCK line is in the correct idle state. It is not |
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* allowed to claim the same bus for several slaves without releasing |
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* the bus in between. |
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* |
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* @slave: The SPI slave |
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* |
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* Returns: 0 if the bus was claimed successfully, or a negative value |
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* if it wasn't. |
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*/ |
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int spi_claim_bus(struct spi_slave *slave); |
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/** |
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* Release the SPI bus |
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* |
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* This must be called once for every call to spi_claim_bus() after |
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* all transfers have finished. It may disable any SPI hardware as |
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* appropriate. |
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* |
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* @slave: The SPI slave |
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*/ |
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void spi_release_bus(struct spi_slave *slave); |
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/** |
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* Set the word length for SPI transactions |
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* |
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* Set the word length (number of bits per word) for SPI transactions. |
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* |
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* @slave: The SPI slave |
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* @wordlen: The number of bits in a word |
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* |
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* Returns: 0 on success, -1 on failure. |
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*/ |
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int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen); |
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/** |
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* SPI transfer |
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* |
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* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks |
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* "bitlen" bits in the SPI MISO port. That's just the way SPI works. |
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* |
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* The source of the outgoing bits is the "dout" parameter and the |
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* destination of the input bits is the "din" parameter. Note that "dout" |
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* and "din" can point to the same memory location, in which case the |
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* input data overwrites the output data (since both are buffered by |
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* temporary variables, this is OK). |
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* |
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* spi_xfer() interface: |
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* @slave: The SPI slave which will be sending/receiving the data. |
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* @bitlen: How many bits to write and read. |
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* @dout: Pointer to a string of bits to send out. The bits are |
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* held in a byte array and are sent MSB first. |
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* @din: Pointer to a string of bits that will be filled in. |
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* @flags: A bitwise combination of SPI_XFER_* flags. |
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* |
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* Returns: 0 on success, not 0 on failure |
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*/ |
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int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, |
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void *din, unsigned long flags); |
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/* Copy memory mapped data */ |
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void spi_flash_copy_mmap(void *data, void *offset, size_t len); |
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/** |
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* Determine if a SPI chipselect is valid. |
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* This function is provided by the board if the low-level SPI driver |
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* needs it to determine if a given chipselect is actually valid. |
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* |
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* Returns: 1 if bus:cs identifies a valid chip on this board, 0 |
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* otherwise. |
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*/ |
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int spi_cs_is_valid(unsigned int bus, unsigned int cs); |
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#ifndef CONFIG_DM_SPI |
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/** |
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* Activate a SPI chipselect. |
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* This function is provided by the board code when using a driver |
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* that can't control its chipselects automatically (e.g. |
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* common/soft_spi.c). When called, it should activate the chip select |
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* to the device identified by "slave". |
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*/ |
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void spi_cs_activate(struct spi_slave *slave); |
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/** |
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* Deactivate a SPI chipselect. |
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* This function is provided by the board code when using a driver |
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* that can't control its chipselects automatically (e.g. |
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* common/soft_spi.c). When called, it should deactivate the chip |
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* select to the device identified by "slave". |
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*/ |
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void spi_cs_deactivate(struct spi_slave *slave); |
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/** |
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* Set transfer speed. |
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* This sets a new speed to be applied for next spi_xfer(). |
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* @slave: The SPI slave |
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* @hz: The transfer speed |
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*/ |
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void spi_set_speed(struct spi_slave *slave, uint hz); |
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#endif |
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/** |
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* Write 8 bits, then read 8 bits. |
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* @slave: The SPI slave we're communicating with |
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* @byte: Byte to be written |
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* |
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* Returns: The value that was read, or a negative value on error. |
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* |
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* TODO: This function probably shouldn't be inlined. |
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*/ |
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static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte) |
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{ |
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unsigned char dout[2]; |
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unsigned char din[2]; |
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int ret; |
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dout[0] = byte; |
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dout[1] = 0; |
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ret = spi_xfer(slave, 16, dout, din, SPI_XFER_BEGIN | SPI_XFER_END); |
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return ret < 0 ? ret : din[1]; |
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} |
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#ifdef CONFIG_DM_SPI |
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/** |
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* struct spi_cs_info - Information about a bus chip select |
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* |
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* @dev: Connected device, or NULL if none |
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*/ |
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struct spi_cs_info { |
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struct udevice *dev; |
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}; |
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/** |
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* struct struct dm_spi_ops - Driver model SPI operations |
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* |
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* The uclass interface is implemented by all SPI devices which use |
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* driver model. |
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*/ |
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struct dm_spi_ops { |
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/** |
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* Claim the bus and prepare it for communication. |
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* |
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* The device provided is the slave device. It's parent controller |
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* will be used to provide the communication. |
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* |
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* This must be called before doing any transfers with a SPI slave. It |
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* will enable and initialize any SPI hardware as necessary, and make |
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* sure that the SCK line is in the correct idle state. It is not |
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* allowed to claim the same bus for several slaves without releasing |
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* the bus in between. |
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* |
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* @dev: The SPI slave |
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* |
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* Returns: 0 if the bus was claimed successfully, or a negative value |
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* if it wasn't. |
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*/ |
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int (*claim_bus)(struct udevice *dev); |
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/** |
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* Release the SPI bus |
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* |
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* This must be called once for every call to spi_claim_bus() after |
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* all transfers have finished. It may disable any SPI hardware as |
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* appropriate. |
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* |
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* @dev: The SPI slave |
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*/ |
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int (*release_bus)(struct udevice *dev); |
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/** |
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* Set the word length for SPI transactions |
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* |
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* Set the word length (number of bits per word) for SPI transactions. |
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* |
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* @bus: The SPI slave |
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* @wordlen: The number of bits in a word |
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* |
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* Returns: 0 on success, -ve on failure. |
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*/ |
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int (*set_wordlen)(struct udevice *dev, unsigned int wordlen); |
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|
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/** |
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* SPI transfer |
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* |
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* This writes "bitlen" bits out the SPI MOSI port and simultaneously |
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* clocks "bitlen" bits in the SPI MISO port. That's just the way SPI |
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* works. |
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* |
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* The source of the outgoing bits is the "dout" parameter and the |
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* destination of the input bits is the "din" parameter. Note that |
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* "dout" and "din" can point to the same memory location, in which |
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* case the input data overwrites the output data (since both are |
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* buffered by temporary variables, this is OK). |
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* |
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* spi_xfer() interface: |
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* @dev: The slave device to communicate with |
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* @bitlen: How many bits to write and read. |
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* @dout: Pointer to a string of bits to send out. The bits are |
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* held in a byte array and are sent MSB first. |
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* @din: Pointer to a string of bits that will be filled in. |
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* @flags: A bitwise combination of SPI_XFER_* flags. |
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* |
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* Returns: 0 on success, not -1 on failure |
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*/ |
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int (*xfer)(struct udevice *dev, unsigned int bitlen, const void *dout, |
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void *din, unsigned long flags); |
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/** |
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* Set transfer speed. |
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* This sets a new speed to be applied for next spi_xfer(). |
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* @bus: The SPI bus |
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* @hz: The transfer speed |
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* @return 0 if OK, -ve on error |
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*/ |
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int (*set_speed)(struct udevice *bus, uint hz); |
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/** |
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* Set the SPI mode/flags |
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* |
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* It is unclear if we want to set speed and mode together instead |
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* of separately. |
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* |
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* @bus: The SPI bus |
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* @mode: Requested SPI mode (SPI_... flags) |
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* @return 0 if OK, -ve on error |
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*/ |
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int (*set_mode)(struct udevice *bus, uint mode); |
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/** |
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* Get information on a chip select |
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* |
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* This is only called when the SPI uclass does not know about a |
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* chip select, i.e. it has no attached device. It gives the driver |
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* a chance to allow activity on that chip select even so. |
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* |
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* @bus: The SPI bus |
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* @cs: The chip select (0..n-1) |
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* @info: Returns information about the chip select, if valid. |
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* On entry info->dev is NULL |
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* @return 0 if OK (and @info is set up), -ENODEV if the chip select |
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* is invalid, other -ve value on error |
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*/ |
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int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info); |
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}; |
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struct dm_spi_emul_ops { |
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/** |
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* SPI transfer |
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* |
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* This writes "bitlen" bits out the SPI MOSI port and simultaneously |
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* clocks "bitlen" bits in the SPI MISO port. That's just the way SPI |
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* works. Here the device is a slave. |
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* |
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* The source of the outgoing bits is the "dout" parameter and the |
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* destination of the input bits is the "din" parameter. Note that |
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* "dout" and "din" can point to the same memory location, in which |
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* case the input data overwrites the output data (since both are |
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* buffered by temporary variables, this is OK). |
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* |
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* spi_xfer() interface: |
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* @slave: The SPI slave which will be sending/receiving the data. |
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* @bitlen: How many bits to write and read. |
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* @dout: Pointer to a string of bits sent to the device. The |
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* bits are held in a byte array and are sent MSB first. |
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* @din: Pointer to a string of bits that will be sent back to |
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* the master. |
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* @flags: A bitwise combination of SPI_XFER_* flags. |
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* |
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* Returns: 0 on success, not -1 on failure |
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*/ |
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int (*xfer)(struct udevice *slave, unsigned int bitlen, |
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const void *dout, void *din, unsigned long flags); |
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}; |
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/** |
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* spi_find_bus_and_cs() - Find bus and slave devices by number |
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* |
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* Given a bus number and chip select, this finds the corresponding bus |
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* device and slave device. Neither device is activated by this function, |
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* although they may have been activated previously. |
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* |
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* @busnum: SPI bus number |
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* @cs: Chip select to look for |
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* @busp: Returns bus device |
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* @devp: Return slave device |
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* @return 0 if found, -ENODEV on error |
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*/ |
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int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp, |
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struct udevice **devp); |
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/** |
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* spi_get_bus_and_cs() - Find and activate bus and slave devices by number |
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* |
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* Given a bus number and chip select, this finds the corresponding bus |
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* device and slave device. |
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* |
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* If no such slave exists, and drv_name is not NULL, then a new slave device |
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* is automatically bound on this chip select. |
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* |
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* Ths new slave device is probed ready for use with the given speed and mode. |
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* |
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* @busnum: SPI bus number |
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* @cs: Chip select to look for |
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* @speed: SPI speed to use for this slave |
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* @mode: SPI mode to use for this slave |
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* @drv_name: Name of driver to attach to this chip select |
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* @dev_name: Name of the new device thus created |
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* @busp: Returns bus device |
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* @devp: Return slave device |
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* @return 0 if found, -ve on error |
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*/ |
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int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode, |
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const char *drv_name, const char *dev_name, |
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struct udevice **busp, struct spi_slave **devp); |
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|
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/** |
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* spi_chip_select() - Get the chip select for a slave |
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* |
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* @return the chip select this slave is attached to |
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*/ |
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int spi_chip_select(struct udevice *slave); |
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|
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/** |
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* spi_find_chip_select() - Find the slave attached to chip select |
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* |
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* @bus: SPI bus to search |
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* @cs: Chip select to look for |
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* @devp: Returns the slave device if found |
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* @return 0 if found, -ENODEV on error |
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*/ |
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int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp); |
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|
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/** |
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* spi_slave_ofdata_to_platdata() - decode standard SPI platform data |
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* |
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* This decodes the speed and mode for a slave from a device tree node |
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* |
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* @blob: Device tree blob |
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* @node: Node offset to read from |
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* @plat: Place to put the decoded information |
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*/ |
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int spi_slave_ofdata_to_platdata(struct udevice *dev, |
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struct dm_spi_slave_platdata *plat); |
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|
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/** |
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* spi_cs_info() - Check information on a chip select |
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* |
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* This checks a particular chip select on a bus to see if it has a device |
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* attached, or is even valid. |
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* |
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* @bus: The SPI bus |
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* @cs: The chip select (0..n-1) |
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* @info: Returns information about the chip select, if valid |
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* @return 0 if OK (and @info is set up), -ENODEV if the chip select |
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* is invalid, other -ve value on error |
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*/ |
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int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info); |
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struct sandbox_state; |
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|
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/** |
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* sandbox_spi_get_emul() - get an emulator for a SPI slave |
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* |
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* This provides a way to attach an emulated SPI device to a particular SPI |
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* slave, so that xfer() operations on the slave will be handled by the |
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* emulator. If a emulator already exists on that chip select it is returned. |
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* Otherwise one is created. |
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* |
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* @state: Sandbox state |
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* @bus: SPI bus requesting the emulator |
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* @slave: SPI slave device requesting the emulator |
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* @emuip: Returns pointer to emulator |
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* @return 0 if OK, -ve on error |
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*/ |
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int sandbox_spi_get_emul(struct sandbox_state *state, |
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struct udevice *bus, struct udevice *slave, |
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struct udevice **emulp); |
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/** |
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* Claim the bus and prepare it for communication with a given slave. |
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* |
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* This must be called before doing any transfers with a SPI slave. It |
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* will enable and initialize any SPI hardware as necessary, and make |
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* sure that the SCK line is in the correct idle state. It is not |
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* allowed to claim the same bus for several slaves without releasing |
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* the bus in between. |
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* |
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* @dev: The SPI slave device |
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* |
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* Returns: 0 if the bus was claimed successfully, or a negative value |
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* if it wasn't. |
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*/ |
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int dm_spi_claim_bus(struct udevice *dev); |
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|
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/** |
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* Release the SPI bus |
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* |
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* This must be called once for every call to dm_spi_claim_bus() after |
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* all transfers have finished. It may disable any SPI hardware as |
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* appropriate. |
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* |
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* @slave: The SPI slave device |
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*/ |
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void dm_spi_release_bus(struct udevice *dev); |
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|
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/** |
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* SPI transfer |
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* |
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* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks |
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* "bitlen" bits in the SPI MISO port. That's just the way SPI works. |
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* |
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* The source of the outgoing bits is the "dout" parameter and the |
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* destination of the input bits is the "din" parameter. Note that "dout" |
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* and "din" can point to the same memory location, in which case the |
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* input data overwrites the output data (since both are buffered by |
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* temporary variables, this is OK). |
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* |
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* dm_spi_xfer() interface: |
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* @dev: The SPI slave device which will be sending/receiving the data. |
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* @bitlen: How many bits to write and read. |
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* @dout: Pointer to a string of bits to send out. The bits are |
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* held in a byte array and are sent MSB first. |
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* @din: Pointer to a string of bits that will be filled in. |
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* @flags: A bitwise combination of SPI_XFER_* flags. |
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* |
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* Returns: 0 on success, not 0 on failure |
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*/ |
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int dm_spi_xfer(struct udevice *dev, unsigned int bitlen, |
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const void *dout, void *din, unsigned long flags); |
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|
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/* Access the operations for a SPI device */ |
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#define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops) |
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#define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops) |
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#endif /* CONFIG_DM_SPI */ |
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#endif /* _SPI_H_ */
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