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