X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-uboot.git;a=blobdiff_plain;f=include%2Fi2c.h;h=6493931c3539daac140518146974ee49e83ca1ff;hp=27fe00f17361763a42bc13f59e378d464c484dc6;hb=13a3e2ee237f515af5738c07aaf604db9b54be34;hpb=3d5920a31bb846249385e1ca5c086662c39bc44e diff --git a/include/i2c.h b/include/i2c.h index 27fe00f173..6493931c35 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -25,14 +25,13 @@ * enough as to be incompatible for compilation purposes. */ -#ifdef CONFIG_DM_I2C - enum dm_i2c_chip_flags { DM_I2C_CHIP_10BIT = 1 << 0, /* Use 10-bit addressing */ DM_I2C_CHIP_RD_ADDRESS = 1 << 1, /* Send address for each read byte */ DM_I2C_CHIP_WR_ADDRESS = 1 << 2, /* Send address for each write byte */ }; +struct udevice; /** * struct dm_i2c_chip - information about an i2c chip * @@ -55,6 +54,7 @@ struct dm_i2c_chip { uint flags; #ifdef CONFIG_SANDBOX struct udevice *emul; + bool test_mode; #endif }; @@ -65,8 +65,8 @@ struct dm_i2c_chip { * bus can operate at different speeds (measured in Hz, typically 100KHz * or 400KHz). * - * To obtain this structure, use bus->uclass_priv where bus is the I2C - * bus udevice. + * To obtain this structure, use dev_get_uclass_priv(bus) where bus is the + * I2C bus udevice. * * @speed_hz: Bus speed in hertz (typically 100000) */ @@ -74,6 +74,49 @@ struct dm_i2c_bus { int speed_hz; }; +/* + * Not all of these flags are implemented in the U-Boot API + */ +enum dm_i2c_msg_flags { + I2C_M_TEN = 0x0010, /* ten-bit chip address */ + I2C_M_RD = 0x0001, /* read data, from slave to master */ + I2C_M_STOP = 0x8000, /* send stop after this message */ + I2C_M_NOSTART = 0x4000, /* no start before this message */ + I2C_M_REV_DIR_ADDR = 0x2000, /* invert polarity of R/W bit */ + I2C_M_IGNORE_NAK = 0x1000, /* continue after NAK */ + I2C_M_NO_RD_ACK = 0x0800, /* skip the Ack bit on reads */ + I2C_M_RECV_LEN = 0x0400, /* length is first received byte */ +}; + +/** + * struct i2c_msg - an I2C message + * + * @addr: Slave address + * @flags: Flags (see enum dm_i2c_msg_flags) + * @len: Length of buffer in bytes, may be 0 for a probe + * @buf: Buffer to send/receive, or NULL if no data + */ +struct i2c_msg { + uint addr; + uint flags; + uint len; + u8 *buf; +}; + +/** + * struct i2c_msg_list - a list of I2C messages + * + * This is called i2c_rdwr_ioctl_data in Linux but the name does not seem + * appropriate in U-Boot. + * + * @msg: Pointer to i2c_msg array + * @nmsgs: Number of elements in the array + */ +struct i2c_msg_list { + struct i2c_msg *msgs; + uint nmsgs; +}; + /** * dm_i2c_read() - read bytes from an I2C chip * @@ -125,21 +168,57 @@ int dm_i2c_probe(struct udevice *bus, uint chip_addr, uint chip_flags, struct udevice **devp); /** - * i2c_set_bus_speed() - set the speed of a bus + * dm_i2c_reg_read() - Read a value from an I2C register + * + * This reads a single value from the given address in an I2C chip + * + * @dev: Device to use for transfer + * @addr: Address to read from + * @return value read, or -ve on error + */ +int dm_i2c_reg_read(struct udevice *dev, uint offset); + +/** + * dm_i2c_reg_write() - Write a value to an I2C register + * + * This writes a single value to the given address in an I2C chip + * + * @dev: Device to use for transfer + * @addr: Address to write to + * @val: Value to write (normally a byte) + * @return 0 on success, -ve on error + */ +int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val); + +/** + * dm_i2c_xfer() - Transfer messages over I2C + * + * This transfers a raw message. It is best to use dm_i2c_reg_read/write() + * instead. + * + * @dev: Device to use for transfer + * @msg: List of messages to transfer + * @nmsgs: Number of messages to transfer + * @return 0 on success, -ve on error + */ +int dm_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs); + +/** + * dm_i2c_set_bus_speed() - set the speed of a bus * * @bus: Bus to adjust * @speed: Requested speed in Hz * @return 0 if OK, -EINVAL for invalid values */ -int i2c_set_bus_speed(struct udevice *bus, unsigned int speed); +int dm_i2c_set_bus_speed(struct udevice *bus, unsigned int speed); /** - * i2c_get_bus_speed() - get the speed of a bus + * dm_i2c_get_bus_speed() - get the speed of a bus * * @bus: Bus to check * @return speed of selected I2C bus in Hz, -ve on error */ -int i2c_get_bus_speed(struct udevice *bus); +int dm_i2c_get_bus_speed(struct udevice *bus); /** * i2c_set_chip_flags() - set flags for a chip @@ -172,8 +251,15 @@ int i2c_get_chip_flags(struct udevice *dev, uint *flagsp); * * @offset_len: New offset length value (typically 1 or 2) */ - int i2c_set_chip_offset_len(struct udevice *dev, uint offset_len); + +/** + * i2c_get_offset_len() - get the offset length for a chip + * + * @return: Current offset length value (typically 1 or 2) + */ +int i2c_get_chip_offset_len(struct udevice *dev); + /** * i2c_deblock() - recover a bus that is in an unknown state * @@ -256,50 +342,13 @@ void i2c_init(int speed, int slaveaddr); */ void board_i2c_init(const void *blob); -#endif - /* - * Not all of these flags are implemented in the U-Boot API - */ -enum dm_i2c_msg_flags { - I2C_M_TEN = 0x0010, /* ten-bit chip address */ - I2C_M_RD = 0x0001, /* read data, from slave to master */ - I2C_M_STOP = 0x8000, /* send stop after this message */ - I2C_M_NOSTART = 0x4000, /* no start before this message */ - I2C_M_REV_DIR_ADDR = 0x2000, /* invert polarity of R/W bit */ - I2C_M_IGNORE_NAK = 0x1000, /* continue after NAK */ - I2C_M_NO_RD_ACK = 0x0800, /* skip the Ack bit on reads */ - I2C_M_RECV_LEN = 0x0400, /* length is first received byte */ -}; - -/** - * struct i2c_msg - an I2C message - * - * @addr: Slave address - * @flags: Flags (see enum dm_i2c_msg_flags) - * @len: Length of buffer in bytes, may be 0 for a probe - * @buf: Buffer to send/receive, or NULL if no data + * Compatibility functions for driver model. */ -struct i2c_msg { - uint addr; - uint flags; - uint len; - u8 *buf; -}; +uint8_t i2c_reg_read(uint8_t addr, uint8_t reg); +void i2c_reg_write(uint8_t addr, uint8_t reg, uint8_t val); -/** - * struct i2c_msg_list - a list of I2C messages - * - * This is called i2c_rdwr_ioctl_data in Linux but the name does not seem - * appropriate in U-Boot. - * - * @msg: Pointer to i2c_msg array - * @nmsgs: Number of elements in the array - */ -struct i2c_msg_list { - struct i2c_msg *msgs; - uint nmsgs; -}; +#endif /** * struct dm_i2c_ops - driver operations for I2C uclass @@ -341,7 +390,7 @@ struct dm_i2c_ops { * The bus speed value will be updated by the uclass if this function * does not return an error. This method is optional - if it is not * provided then the driver can read the speed from - * bus->uclass_priv->speed_hz + * dev_get_uclass_priv(bus)->speed_hz * * @bus: Bus to adjust * @speed: Requested speed in Hz @@ -355,7 +404,7 @@ struct dm_i2c_ops { * Normally this can be provided by the uclass, but if you want your * driver to check the bus speed by looking at the hardware, you can * implement that here. This method is optional. This method would - * normally be expected to return bus->uclass_priv->speed_hz. + * normally be expected to return dev_get_uclass_priv(bus)->speed_hz. * * @bus: Bus to check * @return speed of selected I2C bus in Hz, -ve on error @@ -395,6 +444,45 @@ struct dm_i2c_ops { #define i2c_get_ops(dev) ((struct dm_i2c_ops *)(dev)->driver->ops) +/** + * struct i2c_mux_ops - operations for an I2C mux + * + * The current mux state is expected to be stored in the mux itself since + * it is the only thing that knows how to make things work. The mux can + * record the current state and then avoid switching unless it is necessary. + * So select() can be skipped if the mux is already in the correct state. + * Also deselect() can be made a nop if required. + */ +struct i2c_mux_ops { + /** + * select() - select one of of I2C buses attached to a mux + * + * This will be called when there is no bus currently selected by the + * mux. This method does not need to deselect the old bus since + * deselect() will be already have been called if necessary. + * + * @mux: Mux device + * @bus: I2C bus to select + * @channel: Channel number correponding to the bus to select + * @return 0 if OK, -ve on error + */ + int (*select)(struct udevice *mux, struct udevice *bus, uint channel); + + /** + * deselect() - select one of of I2C buses attached to a mux + * + * This is used to deselect the currently selected I2C bus. + * + * @mux: Mux device + * @bus: I2C bus to deselect + * @channel: Channel number correponding to the bus to deselect + * @return 0 if OK, -ve on error + */ + int (*deselect)(struct udevice *mux, struct udevice *bus, uint channel); +}; + +#define i2c_mux_get_ops(dev) ((struct i2c_mux_ops *)(dev)->driver->ops) + /** * i2c_get_chip() - get a device to use to access a chip on a bus * @@ -439,7 +527,15 @@ int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len, int i2c_chip_ofdata_to_platdata(const void *blob, int node, struct dm_i2c_chip *chip); -#endif +/** + * i2c_dump_msgs() - Dump a list of I2C messages + * + * This may be useful for debugging. + * + * @msg: Message list to dump + * @nmsgs: Number of messages + */ +void i2c_dump_msgs(struct i2c_msg *msg, int nmsgs); #ifndef CONFIG_DM_I2C