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usr
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src
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linux-headers-5.4.0-215
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include
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linux
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i3c
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Filename :
device.h
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/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2018 Cadence Design Systems Inc. * * Author: Boris Brezillon <boris.brezillon@bootlin.com> */ #ifndef I3C_DEV_H #define I3C_DEV_H #include <linux/bitops.h> #include <linux/device.h> #include <linux/i2c.h> #include <linux/kconfig.h> #include <linux/mod_devicetable.h> #include <linux/module.h> /** * enum i3c_error_code - I3C error codes * * These are the standard error codes as defined by the I3C specification. * When -EIO is returned by the i3c_device_do_priv_xfers() or * i3c_device_send_hdr_cmds() one can check the error code in * &struct_i3c_priv_xfer.err or &struct i3c_hdr_cmd.err to get a better idea of * what went wrong. * * @I3C_ERROR_UNKNOWN: unknown error, usually means the error is not I3C * related * @I3C_ERROR_M0: M0 error * @I3C_ERROR_M1: M1 error * @I3C_ERROR_M2: M2 error */ enum i3c_error_code { I3C_ERROR_UNKNOWN = 0, I3C_ERROR_M0 = 1, I3C_ERROR_M1, I3C_ERROR_M2, }; /** * enum i3c_hdr_mode - HDR mode ids * @I3C_HDR_DDR: DDR mode * @I3C_HDR_TSP: TSP mode * @I3C_HDR_TSL: TSL mode */ enum i3c_hdr_mode { I3C_HDR_DDR, I3C_HDR_TSP, I3C_HDR_TSL, }; /** * struct i3c_priv_xfer - I3C SDR private transfer * @rnw: encodes the transfer direction. true for a read, false for a write * @len: transfer length in bytes of the transfer * @data: input/output buffer * @data.in: input buffer. Must point to a DMA-able buffer * @data.out: output buffer. Must point to a DMA-able buffer * @err: I3C error code */ struct i3c_priv_xfer { u8 rnw; u16 len; union { void *in; const void *out; } data; enum i3c_error_code err; }; /** * enum i3c_dcr - I3C DCR values * @I3C_DCR_GENERIC_DEVICE: generic I3C device */ enum i3c_dcr { I3C_DCR_GENERIC_DEVICE = 0, }; #define I3C_PID_MANUF_ID(pid) (((pid) & GENMASK_ULL(47, 33)) >> 33) #define I3C_PID_RND_LOWER_32BITS(pid) (!!((pid) & BIT_ULL(32))) #define I3C_PID_RND_VAL(pid) ((pid) & GENMASK_ULL(31, 0)) #define I3C_PID_PART_ID(pid) (((pid) & GENMASK_ULL(31, 16)) >> 16) #define I3C_PID_INSTANCE_ID(pid) (((pid) & GENMASK_ULL(15, 12)) >> 12) #define I3C_PID_EXTRA_INFO(pid) ((pid) & GENMASK_ULL(11, 0)) #define I3C_BCR_DEVICE_ROLE(bcr) ((bcr) & GENMASK(7, 6)) #define I3C_BCR_I3C_SLAVE (0 << 6) #define I3C_BCR_I3C_MASTER (1 << 6) #define I3C_BCR_HDR_CAP BIT(5) #define I3C_BCR_BRIDGE BIT(4) #define I3C_BCR_OFFLINE_CAP BIT(3) #define I3C_BCR_IBI_PAYLOAD BIT(2) #define I3C_BCR_IBI_REQ_CAP BIT(1) #define I3C_BCR_MAX_DATA_SPEED_LIM BIT(0) /** * struct i3c_device_info - I3C device information * @pid: Provisional ID * @bcr: Bus Characteristic Register * @dcr: Device Characteristic Register * @static_addr: static/I2C address * @dyn_addr: dynamic address * @hdr_cap: supported HDR modes * @max_read_ds: max read speed information * @max_write_ds: max write speed information * @max_ibi_len: max IBI payload length * @max_read_turnaround: max read turn-around time in micro-seconds * @max_read_len: max private SDR read length in bytes * @max_write_len: max private SDR write length in bytes * * These are all basic information that should be advertised by an I3C device. * Some of them are optional depending on the device type and device * capabilities. * For each I3C slave attached to a master with * i3c_master_add_i3c_dev_locked(), the core will send the relevant CCC command * to retrieve these data. */ struct i3c_device_info { u64 pid; u8 bcr; u8 dcr; u8 static_addr; u8 dyn_addr; u8 hdr_cap; u8 max_read_ds; u8 max_write_ds; u8 max_ibi_len; u32 max_read_turnaround; u16 max_read_len; u16 max_write_len; }; /* * I3C device internals are kept hidden from I3C device users. It's just * simpler to refactor things when everything goes through getter/setters, and * I3C device drivers should not have to worry about internal representation * anyway. */ struct i3c_device; /* These macros should be used to i3c_device_id entries. */ #define I3C_MATCH_MANUF_AND_PART (I3C_MATCH_MANUF | I3C_MATCH_PART) #define I3C_DEVICE(_manufid, _partid, _drvdata) \ { \ .match_flags = I3C_MATCH_MANUF_AND_PART, \ .manuf_id = _manufid, \ .part_id = _partid, \ .data = _drvdata, \ } #define I3C_DEVICE_EXTRA_INFO(_manufid, _partid, _info, _drvdata) \ { \ .match_flags = I3C_MATCH_MANUF_AND_PART | \ I3C_MATCH_EXTRA_INFO, \ .manuf_id = _manufid, \ .part_id = _partid, \ .extra_info = _info, \ .data = _drvdata, \ } #define I3C_CLASS(_dcr, _drvdata) \ { \ .match_flags = I3C_MATCH_DCR, \ .dcr = _dcr, \ } /** * struct i3c_driver - I3C device driver * @driver: inherit from device_driver * @probe: I3C device probe method * @remove: I3C device remove method * @id_table: I3C device match table. Will be used by the framework to decide * which device to bind to this driver */ struct i3c_driver { struct device_driver driver; int (*probe)(struct i3c_device *dev); int (*remove)(struct i3c_device *dev); const struct i3c_device_id *id_table; }; static inline struct i3c_driver *drv_to_i3cdrv(struct device_driver *drv) { return container_of(drv, struct i3c_driver, driver); } struct device *i3cdev_to_dev(struct i3c_device *i3cdev); struct i3c_device *dev_to_i3cdev(struct device *dev); const struct i3c_device_id * i3c_device_match_id(struct i3c_device *i3cdev, const struct i3c_device_id *id_table); static inline void i3cdev_set_drvdata(struct i3c_device *i3cdev, void *data) { struct device *dev = i3cdev_to_dev(i3cdev); dev_set_drvdata(dev, data); } static inline void *i3cdev_get_drvdata(struct i3c_device *i3cdev) { struct device *dev = i3cdev_to_dev(i3cdev); return dev_get_drvdata(dev); } int i3c_driver_register_with_owner(struct i3c_driver *drv, struct module *owner); void i3c_driver_unregister(struct i3c_driver *drv); #define i3c_driver_register(__drv) \ i3c_driver_register_with_owner(__drv, THIS_MODULE) /** * module_i3c_driver() - Register a module providing an I3C driver * @__drv: the I3C driver to register * * Provide generic init/exit functions that simply register/unregister an I3C * driver. * Should be used by any driver that does not require extra init/cleanup steps. */ #define module_i3c_driver(__drv) \ module_driver(__drv, i3c_driver_register, i3c_driver_unregister) /** * i3c_i2c_driver_register() - Register an i2c and an i3c driver * @i3cdrv: the I3C driver to register * @i2cdrv: the I2C driver to register * * This function registers both @i2cdev and @i3cdev, and fails if one of these * registrations fails. This is mainly useful for devices that support both I2C * and I3C modes. * Note that when CONFIG_I3C is not enabled, this function only registers the * I2C driver. * * Return: 0 if both registrations succeeds, a negative error code otherwise. */ static inline int i3c_i2c_driver_register(struct i3c_driver *i3cdrv, struct i2c_driver *i2cdrv) { int ret; ret = i2c_add_driver(i2cdrv); if (ret || !IS_ENABLED(CONFIG_I3C)) return ret; ret = i3c_driver_register(i3cdrv); if (ret) i2c_del_driver(i2cdrv); return ret; } /** * i3c_i2c_driver_unregister() - Unregister an i2c and an i3c driver * @i3cdrv: the I3C driver to register * @i2cdrv: the I2C driver to register * * This function unregisters both @i3cdrv and @i2cdrv. * Note that when CONFIG_I3C is not enabled, this function only unregisters the * @i2cdrv. */ static inline void i3c_i2c_driver_unregister(struct i3c_driver *i3cdrv, struct i2c_driver *i2cdrv) { if (IS_ENABLED(CONFIG_I3C)) i3c_driver_unregister(i3cdrv); i2c_del_driver(i2cdrv); } /** * module_i3c_i2c_driver() - Register a module providing an I3C and an I2C * driver * @__i3cdrv: the I3C driver to register * @__i2cdrv: the I3C driver to register * * Provide generic init/exit functions that simply register/unregister an I3C * and an I2C driver. * This macro can be used even if CONFIG_I3C is disabled, in this case, only * the I2C driver will be registered. * Should be used by any driver that does not require extra init/cleanup steps. */ #define module_i3c_i2c_driver(__i3cdrv, __i2cdrv) \ module_driver(__i3cdrv, \ i3c_i2c_driver_register, \ i3c_i2c_driver_unregister) int i3c_device_do_priv_xfers(struct i3c_device *dev, struct i3c_priv_xfer *xfers, int nxfers); void i3c_device_get_info(struct i3c_device *dev, struct i3c_device_info *info); struct i3c_ibi_payload { unsigned int len; const void *data; }; /** * struct i3c_ibi_setup - IBI setup object * @max_payload_len: maximum length of the payload associated to an IBI. If one * IBI appears to have a payload that is bigger than this * number, the IBI will be rejected. * @num_slots: number of pre-allocated IBI slots. This should be chosen so that * the system never runs out of IBI slots, otherwise you'll lose * IBIs. * @handler: IBI handler, every time an IBI is received. This handler is called * in a workqueue context. It is allowed to sleep and send new * messages on the bus, though it's recommended to keep the * processing done there as fast as possible to avoid delaying * processing of other queued on the same workqueue. * * Temporary structure used to pass information to i3c_device_request_ibi(). * This object can be allocated on the stack since i3c_device_request_ibi() * copies every bit of information and do not use it after * i3c_device_request_ibi() has returned. */ struct i3c_ibi_setup { unsigned int max_payload_len; unsigned int num_slots; void (*handler)(struct i3c_device *dev, const struct i3c_ibi_payload *payload); }; int i3c_device_request_ibi(struct i3c_device *dev, const struct i3c_ibi_setup *setup); void i3c_device_free_ibi(struct i3c_device *dev); int i3c_device_enable_ibi(struct i3c_device *dev); int i3c_device_disable_ibi(struct i3c_device *dev); #endif /* I3C_DEV_H */