X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-uboot.git;a=blobdiff_plain;f=include%2Fspi.h;h=51fdfd6d7360d9c601ffce37fb3c83bc86c3a127;hp=c2086fc62e7f25631bbd9a55dc5933e98fbb73c6;hb=e439af81804d15fd95f804205184a9ff3e15b72a;hpb=004f15b6000e220b74433b190e60805ce8776d92 diff --git a/include/spi.h b/include/spi.h index c2086fc62e..51fdfd6d73 100644 --- a/include/spi.h +++ b/include/spi.h @@ -1,4 +1,6 @@ /* + * Common SPI Interface: Controller-specific definitions + * * (C) Copyright 2001 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com. * @@ -8,8 +10,6 @@ #ifndef _SPI_H_ #define _SPI_H_ -/* Controller-specific definitions: */ - /* SPI mode flags */ #define SPI_CPHA 0x01 /* clock phase */ #define SPI_CPOL 0x02 /* clock polarity */ @@ -25,30 +25,113 @@ #define SPI_PREAMBLE 0x80 /* Skip preamble bytes */ /* SPI transfer flags */ -#define SPI_XFER_BEGIN 0x01 /* Assert CS before transfer */ -#define SPI_XFER_END 0x02 /* Deassert CS after transfer */ -#define SPI_XFER_MMAP 0x08 /* Memory Mapped start */ -#define SPI_XFER_MMAP_END 0x10 /* Memory Mapped End */ +#define SPI_XFER_BEGIN 0x01 /* Assert CS before transfer */ +#define SPI_XFER_END 0x02 /* Deassert CS after transfer */ +#define SPI_XFER_MMAP 0x08 /* Memory Mapped start */ +#define SPI_XFER_MMAP_END 0x10 /* Memory Mapped End */ +#define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END) +#define SPI_XFER_U_PAGE (1 << 5) + +/* SPI TX operation modes */ +#define SPI_OPM_TX_QPP (1 << 0) +#define SPI_OPM_TX_BP (1 << 1) + +/* SPI RX operation modes */ +#define SPI_OPM_RX_AS (1 << 0) +#define SPI_OPM_RX_AF (1 << 1) +#define SPI_OPM_RX_DOUT (1 << 2) +#define SPI_OPM_RX_DIO (1 << 3) +#define SPI_OPM_RX_QOF (1 << 4) +#define SPI_OPM_RX_QIOF (1 << 5) +#define SPI_OPM_RX_EXTN (SPI_OPM_RX_AS | SPI_OPM_RX_AF | SPI_OPM_RX_DOUT | \ + SPI_OPM_RX_DIO | SPI_OPM_RX_QOF | \ + SPI_OPM_RX_QIOF) + +/* SPI bus connection options - see enum spi_dual_flash */ +#define SPI_CONN_DUAL_SHARED (1 << 0) +#define SPI_CONN_DUAL_SEPARATED (1 << 1) /* Header byte that marks the start of the message */ -#define SPI_PREAMBLE_END_BYTE 0xec +#define SPI_PREAMBLE_END_BYTE 0xec + +#define SPI_DEFAULT_WORDLEN 8 + +#ifdef CONFIG_DM_SPI +/* TODO(sjg@chromium.org): Remove this and use max_hz from struct spi_slave */ +struct dm_spi_bus { + uint max_hz; +}; + +/** + * struct dm_spi_platdata - platform data for all SPI slaves + * + * This describes a SPI slave, a child device of the SPI bus. To obtain this + * struct from a spi_slave, use dev_get_parent_platdata(dev) or + * dev_get_parent_platdata(slave->dev). + * + * This data is immuatable. Each time the device is probed, @max_hz and @mode + * will be copied to struct spi_slave. + * + * @cs: Chip select number (0..n-1) + * @max_hz: Maximum bus speed that this slave can tolerate + * @mode: SPI mode to use for this device (see SPI mode flags) + */ +struct dm_spi_slave_platdata { + unsigned int cs; + uint max_hz; + uint mode; +}; + +#endif /* CONFIG_DM_SPI */ /** - * struct spi_slave: Representation of a SPI slave, - * i.e. what we're communicating with. + * struct spi_slave - Representation of a SPI slave * - * Drivers are expected to extend this with controller-specific data. + * For driver model this is the per-child data used by the SPI bus. It can + * be accessed using dev_get_parentdata() on the slave device. The SPI uclass + * sets uip per_child_auto_alloc_size to sizeof(struct spi_slave), and the + * driver should not override it. Two platform data fields (max_hz and mode) + * are copied into this structure to provide an initial value. This allows + * them to be changed, since we should never change platform data in drivers. * - * bus: ID of the bus that the slave is attached to. - * cs: ID of the chip select connected to the slave. - * max_write_size: If non-zero, the maximum number of bytes which can - * be written at once, excluding command bytes. + * If not using driver model, drivers are expected to extend this with + * controller-specific data. + * + * @dev: SPI slave device + * @max_hz: Maximum speed for this slave + * @mode: SPI mode to use for this slave (see SPI mode flags) + * @speed: Current bus speed. This is 0 until the bus is first + * claimed. + * @bus: ID of the bus that the slave is attached to. For + * driver model this is the sequence number of the SPI + * bus (bus->seq) so does not need to be stored + * @cs: ID of the chip select connected to the slave. + * @op_mode_rx: SPI RX operation mode. + * @op_mode_tx: SPI TX operation mode. + * @wordlen: Size of SPI word in number of bits + * @max_write_size: If non-zero, the maximum number of bytes which can + * be written at once, excluding command bytes. + * @memory_map: Address of read-only SPI flash access. + * @option: Varies SPI bus options - separate, shared bus. + * @flags: Indication of SPI flags. */ struct spi_slave { +#ifdef CONFIG_DM_SPI + struct udevice *dev; /* struct spi_slave is dev->parentdata */ + uint max_hz; + uint speed; + uint mode; +#else unsigned int bus; unsigned int cs; +#endif + u8 op_mode_rx; + u8 op_mode_tx; + unsigned int wordlen; unsigned int max_write_size; void *memory_map; + u8 option; + u8 flags; }; /** @@ -152,6 +235,18 @@ int spi_claim_bus(struct spi_slave *slave); */ void spi_release_bus(struct spi_slave *slave); +/** + * Set the word length for SPI transactions + * + * Set the word length (number of bits per word) for SPI transactions. + * + * @slave: The SPI slave + * @wordlen: The number of bits in a word + * + * Returns: 0 on success, -1 on failure. + */ +int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen); + /** * SPI transfer * @@ -177,6 +272,9 @@ void spi_release_bus(struct spi_slave *slave); int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, void *din, unsigned long flags); +/* Copy memory mapped data */ +void spi_flash_copy_mmap(void *data, void *offset, size_t len); + /** * Determine if a SPI chipselect is valid. * This function is provided by the board if the low-level SPI driver @@ -185,8 +283,9 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, * Returns: 1 if bus:cs identifies a valid chip on this board, 0 * otherwise. */ -int spi_cs_is_valid(unsigned int bus, unsigned int cs); +int spi_cs_is_valid(unsigned int bus, unsigned int cs); +#ifndef CONFIG_DM_SPI /** * Activate a SPI chipselect. * This function is provided by the board code when using a driver @@ -212,6 +311,7 @@ void spi_cs_deactivate(struct spi_slave *slave); * @hz: The transfer speed */ void spi_set_speed(struct spi_slave *slave, uint hz); +#endif /** * Write 8 bits, then read 8 bits. @@ -241,14 +341,287 @@ static inline int spi_w8r8(struct spi_slave *slave, unsigned char byte) * This calls spi_setup_slave() with the correct bus number. Call * spi_free_slave() to free it later. * - * @param blob Device tree blob - * @param node SPI peripheral node to use - * @param cs Chip select to use - * @param max_hz Maximum SCK rate in Hz (0 for default) - * @param mode Clock polarity, clock phase and other parameters + * @param blob: Device tree blob + * @param slave_node: Slave node to use + * @param spi_node: SPI peripheral node to use * @return pointer to new spi_slave structure */ -struct spi_slave *spi_setup_slave_fdt(const void *blob, int node, - unsigned int cs, unsigned int max_hz, unsigned int mode); +struct spi_slave *spi_setup_slave_fdt(const void *blob, int slave_node, + int spi_node); + +/** + * spi_base_setup_slave_fdt() - helper function to set up a SPI slace + * + * This decodes SPI properties from the slave node to determine the + * chip select and SPI parameters. + * + * @blob: Device tree blob + * @busnum: Bus number to use + * @node: Device tree node for the SPI bus + */ +struct spi_slave *spi_base_setup_slave_fdt(const void *blob, int busnum, + int node); + +#ifdef CONFIG_DM_SPI + +/** + * struct spi_cs_info - Information about a bus chip select + * + * @dev: Connected device, or NULL if none + */ +struct spi_cs_info { + struct udevice *dev; +}; + +/** + * struct struct dm_spi_ops - Driver model SPI operations + * + * The uclass interface is implemented by all SPI devices which use + * driver model. + */ +struct dm_spi_ops { + /** + * Claim the bus and prepare it for communication. + * + * The device provided is the slave device. It's parent controller + * will be used to provide the communication. + * + * This must be called before doing any transfers with a SPI slave. It + * will enable and initialize any SPI hardware as necessary, and make + * sure that the SCK line is in the correct idle state. It is not + * allowed to claim the same bus for several slaves without releasing + * the bus in between. + * + * @dev: The SPI slave + * + * Returns: 0 if the bus was claimed successfully, or a negative value + * if it wasn't. + */ + int (*claim_bus)(struct udevice *dev); + + /** + * Release the SPI bus + * + * This must be called once for every call to spi_claim_bus() after + * all transfers have finished. It may disable any SPI hardware as + * appropriate. + * + * @dev: The SPI slave + */ + int (*release_bus)(struct udevice *dev); + + /** + * Set the word length for SPI transactions + * + * Set the word length (number of bits per word) for SPI transactions. + * + * @bus: The SPI slave + * @wordlen: The number of bits in a word + * + * Returns: 0 on success, -ve on failure. + */ + int (*set_wordlen)(struct udevice *dev, unsigned int wordlen); + + /** + * SPI transfer + * + * This writes "bitlen" bits out the SPI MOSI port and simultaneously + * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI + * works. + * + * The source of the outgoing bits is the "dout" parameter and the + * destination of the input bits is the "din" parameter. Note that + * "dout" and "din" can point to the same memory location, in which + * case the input data overwrites the output data (since both are + * buffered by temporary variables, this is OK). + * + * spi_xfer() interface: + * @dev: The slave device to communicate with + * @bitlen: How many bits to write and read. + * @dout: Pointer to a string of bits to send out. The bits are + * held in a byte array and are sent MSB first. + * @din: Pointer to a string of bits that will be filled in. + * @flags: A bitwise combination of SPI_XFER_* flags. + * + * Returns: 0 on success, not -1 on failure + */ + int (*xfer)(struct udevice *dev, unsigned int bitlen, const void *dout, + void *din, unsigned long flags); + + /** + * Set transfer speed. + * This sets a new speed to be applied for next spi_xfer(). + * @bus: The SPI bus + * @hz: The transfer speed + * @return 0 if OK, -ve on error + */ + int (*set_speed)(struct udevice *bus, uint hz); + + /** + * Set the SPI mode/flags + * + * It is unclear if we want to set speed and mode together instead + * of separately. + * + * @bus: The SPI bus + * @mode: Requested SPI mode (SPI_... flags) + * @return 0 if OK, -ve on error + */ + int (*set_mode)(struct udevice *bus, uint mode); + + /** + * Get information on a chip select + * + * This is only called when the SPI uclass does not know about a + * chip select, i.e. it has no attached device. It gives the driver + * a chance to allow activity on that chip select even so. + * + * @bus: The SPI bus + * @cs: The chip select (0..n-1) + * @info: Returns information about the chip select, if valid. + * On entry info->dev is NULL + * @return 0 if OK (and @info is set up), -ENODEV if the chip select + * is invalid, other -ve value on error + */ + int (*cs_info)(struct udevice *bus, uint cs, struct spi_cs_info *info); +}; + +struct dm_spi_emul_ops { + /** + * SPI transfer + * + * This writes "bitlen" bits out the SPI MOSI port and simultaneously + * clocks "bitlen" bits in the SPI MISO port. That's just the way SPI + * works. Here the device is a slave. + * + * The source of the outgoing bits is the "dout" parameter and the + * destination of the input bits is the "din" parameter. Note that + * "dout" and "din" can point to the same memory location, in which + * case the input data overwrites the output data (since both are + * buffered by temporary variables, this is OK). + * + * spi_xfer() interface: + * @slave: The SPI slave which will be sending/receiving the data. + * @bitlen: How many bits to write and read. + * @dout: Pointer to a string of bits sent to the device. The + * bits are held in a byte array and are sent MSB first. + * @din: Pointer to a string of bits that will be sent back to + * the master. + * @flags: A bitwise combination of SPI_XFER_* flags. + * + * Returns: 0 on success, not -1 on failure + */ + int (*xfer)(struct udevice *slave, unsigned int bitlen, + const void *dout, void *din, unsigned long flags); +}; + +/** + * spi_find_bus_and_cs() - Find bus and slave devices by number + * + * Given a bus number and chip select, this finds the corresponding bus + * device and slave device. Neither device is activated by this function, + * although they may have been activated previously. + * + * @busnum: SPI bus number + * @cs: Chip select to look for + * @busp: Returns bus device + * @devp: Return slave device + * @return 0 if found, -ENODEV on error + */ +int spi_find_bus_and_cs(int busnum, int cs, struct udevice **busp, + struct udevice **devp); + +/** + * spi_get_bus_and_cs() - Find and activate bus and slave devices by number + * + * Given a bus number and chip select, this finds the corresponding bus + * device and slave device. + * + * If no such slave exists, and drv_name is not NULL, then a new slave device + * is automatically bound on this chip select. + * + * Ths new slave device is probed ready for use with the given speed and mode. + * + * @busnum: SPI bus number + * @cs: Chip select to look for + * @speed: SPI speed to use for this slave + * @mode: SPI mode to use for this slave + * @drv_name: Name of driver to attach to this chip select + * @dev_name: Name of the new device thus created + * @busp: Returns bus device + * @devp: Return slave device + * @return 0 if found, -ve on error + */ +int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode, + const char *drv_name, const char *dev_name, + struct udevice **busp, struct spi_slave **devp); + +/** + * spi_chip_select() - Get the chip select for a slave + * + * @return the chip select this slave is attached to + */ +int spi_chip_select(struct udevice *slave); + +/** + * spi_find_chip_select() - Find the slave attached to chip select + * + * @bus: SPI bus to search + * @cs: Chip select to look for + * @devp: Returns the slave device if found + * @return 0 if found, -ENODEV on error + */ +int spi_find_chip_select(struct udevice *bus, int cs, struct udevice **devp); + +/** + * spi_slave_ofdata_to_platdata() - decode standard SPI platform data + * + * This decodes the speed and mode for a slave from a device tree node + * + * @blob: Device tree blob + * @node: Node offset to read from + * @plat: Place to put the decoded information + */ +int spi_slave_ofdata_to_platdata(const void *blob, int node, + struct dm_spi_slave_platdata *plat); + +/** + * spi_cs_info() - Check information on a chip select + * + * This checks a particular chip select on a bus to see if it has a device + * attached, or is even valid. + * + * @bus: The SPI bus + * @cs: The chip select (0..n-1) + * @info: Returns information about the chip select, if valid + * @return 0 if OK (and @info is set up), -ENODEV if the chip select + * is invalid, other -ve value on error + */ +int spi_cs_info(struct udevice *bus, uint cs, struct spi_cs_info *info); + +struct sandbox_state; + +/** + * sandbox_spi_get_emul() - get an emulator for a SPI slave + * + * This provides a way to attach an emulated SPI device to a particular SPI + * slave, so that xfer() operations on the slave will be handled by the + * emulator. If a emulator already exists on that chip select it is returned. + * Otherwise one is created. + * + * @state: Sandbox state + * @bus: SPI bus requesting the emulator + * @slave: SPI slave device requesting the emulator + * @emuip: Returns pointer to emulator + * @return 0 if OK, -ve on error + */ +int sandbox_spi_get_emul(struct sandbox_state *state, + struct udevice *bus, struct udevice *slave, + struct udevice **emulp); + +/* Access the operations for a SPI device */ +#define spi_get_ops(dev) ((struct dm_spi_ops *)(dev)->driver->ops) +#define spi_emul_get_ops(dev) ((struct dm_spi_emul_ops *)(dev)->driver->ops) +#endif /* CONFIG_DM_SPI */ #endif /* _SPI_H_ */