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hsi.h
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/* * HSI core header file. * * Copyright (C) 2010 Nokia Corporation. All rights reserved. * * Contact: Carlos Chinea <carlos.chinea@nokia.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA */ #ifndef __LINUX_HSI_H__ #define __LINUX_HSI_H__ #include <linux/device.h> #include <linux/mutex.h> #include <linux/scatterlist.h> #include <linux/list.h> #include <linux/module.h> #include <linux/notifier.h> /* HSI message ttype */ #define HSI_MSG_READ 0 #define HSI_MSG_WRITE 1 /* HSI configuration values */ enum { HSI_MODE_STREAM = 1, HSI_MODE_FRAME, }; enum { HSI_FLOW_SYNC, /* Synchronized flow */ HSI_FLOW_PIPE, /* Pipelined flow */ }; enum { HSI_ARB_RR, /* Round-robin arbitration */ HSI_ARB_PRIO, /* Channel priority arbitration */ }; #define HSI_MAX_CHANNELS 16 /* HSI message status codes */ enum { HSI_STATUS_COMPLETED, /* Message transfer is completed */ HSI_STATUS_PENDING, /* Message pending to be read/write (POLL) */ HSI_STATUS_PROCEEDING, /* Message transfer is ongoing */ HSI_STATUS_QUEUED, /* Message waiting to be served */ HSI_STATUS_ERROR, /* Error when message transfer was ongoing */ }; /* HSI port event codes */ enum { HSI_EVENT_START_RX, HSI_EVENT_STOP_RX, }; /** * struct hsi_channel - channel resource used by the hsi clients * @id: Channel number * @name: Channel name */ struct hsi_channel { unsigned int id; const char *name; }; /** * struct hsi_config - Configuration for RX/TX HSI modules * @mode: Bit transmission mode (STREAM or FRAME) * @channels: Channel resources used by the client * @num_channels: Number of channel resources * @num_hw_channels: Number of channels the transceiver is configured for [1..16] * @speed: Max bit transmission speed (Kbit/s) * @flow: RX flow type (SYNCHRONIZED or PIPELINE) * @arb_mode: Arbitration mode for TX frame (Round robin, priority) */ struct hsi_config { unsigned int mode; struct hsi_channel *channels; unsigned int num_channels; unsigned int num_hw_channels; unsigned int speed; union { unsigned int flow; /* RX only */ unsigned int arb_mode; /* TX only */ }; }; /** * struct hsi_board_info - HSI client board info * @name: Name for the HSI device * @hsi_id: HSI controller id where the client sits * @port: Port number in the controller where the client sits * @tx_cfg: HSI TX configuration * @rx_cfg: HSI RX configuration * @platform_data: Platform related data * @archdata: Architecture-dependent device data */ struct hsi_board_info { const char *name; unsigned int hsi_id; unsigned int port; struct hsi_config tx_cfg; struct hsi_config rx_cfg; void *platform_data; struct dev_archdata *archdata; }; #ifdef CONFIG_HSI_BOARDINFO extern int hsi_register_board_info(struct hsi_board_info const *info, unsigned int len); #else static inline int hsi_register_board_info(struct hsi_board_info const *info, unsigned int len) { return 0; } #endif /* CONFIG_HSI_BOARDINFO */ /** * struct hsi_client - HSI client attached to an HSI port * @device: Driver model representation of the device * @tx_cfg: HSI TX configuration * @rx_cfg: HSI RX configuration * @e_handler: Callback for handling port events (RX Wake High/Low) * @pclaimed: Keeps tracks if the clients claimed its associated HSI port * @nb: Notifier block for port events */ struct hsi_client { struct device device; struct hsi_config tx_cfg; struct hsi_config rx_cfg; /* private: */ void (*ehandler)(struct hsi_client *, unsigned long); unsigned int pclaimed:1; struct notifier_block nb; }; #define to_hsi_client(dev) container_of(dev, struct hsi_client, device) static inline void hsi_client_set_drvdata(struct hsi_client *cl, void *data) { dev_set_drvdata(&cl->device, data); } static inline void *hsi_client_drvdata(struct hsi_client *cl) { return dev_get_drvdata(&cl->device); } int hsi_register_port_event(struct hsi_client *cl, void (*handler)(struct hsi_client *, unsigned long)); int hsi_unregister_port_event(struct hsi_client *cl); /** * struct hsi_client_driver - Driver associated to an HSI client * @driver: Driver model representation of the driver */ struct hsi_client_driver { struct device_driver driver; }; #define to_hsi_client_driver(drv) container_of(drv, struct hsi_client_driver,\ driver) int hsi_register_client_driver(struct hsi_client_driver *drv); static inline void hsi_unregister_client_driver(struct hsi_client_driver *drv) { driver_unregister(&drv->driver); } /** * struct hsi_msg - HSI message descriptor * @link: Free to use by the current descriptor owner * @cl: HSI device client that issues the transfer * @sgt: Head of the scatterlist array * @context: Client context data associated to the transfer * @complete: Transfer completion callback * @destructor: Destructor to free resources when flushing * @status: Status of the transfer when completed * @actual_len: Actual length of data transferred on completion * @channel: Channel were to TX/RX the message * @ttype: Transfer type (TX if set, RX otherwise) * @break_frame: if true HSI will send/receive a break frame. Data buffers are * ignored in the request. */ struct hsi_msg { struct list_head link; struct hsi_client *cl; struct sg_table sgt; void *context; void (*complete)(struct hsi_msg *msg); void (*destructor)(struct hsi_msg *msg); int status; unsigned int actual_len; unsigned int channel; unsigned int ttype:1; unsigned int break_frame:1; }; struct hsi_msg *hsi_alloc_msg(unsigned int n_frag, gfp_t flags); void hsi_free_msg(struct hsi_msg *msg); /** * struct hsi_port - HSI port device * @device: Driver model representation of the device * @tx_cfg: Current TX path configuration * @rx_cfg: Current RX path configuration * @num: Port number * @shared: Set when port can be shared by different clients * @claimed: Reference count of clients which claimed the port * @lock: Serialize port claim * @async: Asynchronous transfer callback * @setup: Callback to set the HSI client configuration * @flush: Callback to clean the HW state and destroy all pending transfers * @start_tx: Callback to inform that a client wants to TX data * @stop_tx: Callback to inform that a client no longer wishes to TX data * @release: Callback to inform that a client no longer uses the port * @n_head: Notifier chain for signaling port events to the clients. */ struct hsi_port { struct device device; struct hsi_config tx_cfg; struct hsi_config rx_cfg; unsigned int num; unsigned int shared:1; int claimed; struct mutex lock; int (*async)(struct hsi_msg *msg); int (*setup)(struct hsi_client *cl); int (*flush)(struct hsi_client *cl); int (*start_tx)(struct hsi_client *cl); int (*stop_tx)(struct hsi_client *cl); int (*release)(struct hsi_client *cl); /* private */ struct atomic_notifier_head n_head; }; #define to_hsi_port(dev) container_of(dev, struct hsi_port, device) #define hsi_get_port(cl) to_hsi_port((cl)->device.parent) int hsi_event(struct hsi_port *port, unsigned long event); int hsi_claim_port(struct hsi_client *cl, unsigned int share); void hsi_release_port(struct hsi_client *cl); static inline int hsi_port_claimed(struct hsi_client *cl) { return cl->pclaimed; } static inline void hsi_port_set_drvdata(struct hsi_port *port, void *data) { dev_set_drvdata(&port->device, data); } static inline void *hsi_port_drvdata(struct hsi_port *port) { return dev_get_drvdata(&port->device); } /** * struct hsi_controller - HSI controller device * @device: Driver model representation of the device * @owner: Pointer to the module owning the controller * @id: HSI controller ID * @num_ports: Number of ports in the HSI controller * @port: Array of HSI ports */ struct hsi_controller { struct device device; struct module *owner; unsigned int id; unsigned int num_ports; struct hsi_port **port; }; #define to_hsi_controller(dev) container_of(dev, struct hsi_controller, device) struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags); void hsi_put_controller(struct hsi_controller *hsi); int hsi_register_controller(struct hsi_controller *hsi); void hsi_unregister_controller(struct hsi_controller *hsi); struct hsi_client *hsi_new_client(struct hsi_port *port, struct hsi_board_info *info); int hsi_remove_client(struct device *dev, void *data); void hsi_port_unregister_clients(struct hsi_port *port); #ifdef CONFIG_OF void hsi_add_clients_from_dt(struct hsi_port *port, struct device_node *clients); #else static inline void hsi_add_clients_from_dt(struct hsi_port *port, struct device_node *clients) { return; } #endif static inline void hsi_controller_set_drvdata(struct hsi_controller *hsi, void *data) { dev_set_drvdata(&hsi->device, data); } static inline void *hsi_controller_drvdata(struct hsi_controller *hsi) { return dev_get_drvdata(&hsi->device); } static inline struct hsi_port *hsi_find_port_num(struct hsi_controller *hsi, unsigned int num) { return (num < hsi->num_ports) ? hsi->port[num] : NULL; } /* * API for HSI clients */ int hsi_async(struct hsi_client *cl, struct hsi_msg *msg); int hsi_get_channel_id_by_name(struct hsi_client *cl, char *name); /** * hsi_id - Get HSI controller ID associated to a client * @cl: Pointer to a HSI client * * Return the controller id where the client is attached to */ static inline unsigned int hsi_id(struct hsi_client *cl) { return to_hsi_controller(cl->device.parent->parent)->id; } /** * hsi_port_id - Gets the port number a client is attached to * @cl: Pointer to HSI client * * Return the port number associated to the client */ static inline unsigned int hsi_port_id(struct hsi_client *cl) { return to_hsi_port(cl->device.parent)->num; } /** * hsi_setup - Configure the client's port * @cl: Pointer to the HSI client * * When sharing ports, clients should either relay on a single * client setup or have the same setup for all of them. * * Return -errno on failure, 0 on success */ static inline int hsi_setup(struct hsi_client *cl) { if (!hsi_port_claimed(cl)) return -EACCES; return hsi_get_port(cl)->setup(cl); } /** * hsi_flush - Flush all pending transactions on the client's port * @cl: Pointer to the HSI client * * This function will destroy all pending hsi_msg in the port and reset * the HW port so it is ready to receive and transmit from a clean state. * * Return -errno on failure, 0 on success */ static inline int hsi_flush(struct hsi_client *cl) { if (!hsi_port_claimed(cl)) return -EACCES; return hsi_get_port(cl)->flush(cl); } /** * hsi_async_read - Submit a read transfer * @cl: Pointer to the HSI client * @msg: HSI message descriptor of the transfer * * Return -errno on failure, 0 on success */ static inline int hsi_async_read(struct hsi_client *cl, struct hsi_msg *msg) { msg->ttype = HSI_MSG_READ; return hsi_async(cl, msg); } /** * hsi_async_write - Submit a write transfer * @cl: Pointer to the HSI client * @msg: HSI message descriptor of the transfer * * Return -errno on failure, 0 on success */ static inline int hsi_async_write(struct hsi_client *cl, struct hsi_msg *msg) { msg->ttype = HSI_MSG_WRITE; return hsi_async(cl, msg); } /** * hsi_start_tx - Signal the port that the client wants to start a TX * @cl: Pointer to the HSI client * * Return -errno on failure, 0 on success */ static inline int hsi_start_tx(struct hsi_client *cl) { if (!hsi_port_claimed(cl)) return -EACCES; return hsi_get_port(cl)->start_tx(cl); } /** * hsi_stop_tx - Signal the port that the client no longer wants to transmit * @cl: Pointer to the HSI client * * Return -errno on failure, 0 on success */ static inline int hsi_stop_tx(struct hsi_client *cl) { if (!hsi_port_claimed(cl)) return -EACCES; return hsi_get_port(cl)->stop_tx(cl); } #endif /* __LINUX_HSI_H__ */