/*
 *  Copyright (c) 2012, The Android Open Source Project
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you
 *  may not use this file except in compliance with the License.  You may
 *  obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 *  implied.  See the License for the specific language governing
 *  permissions and limitations under the License.
 */

#ifndef __QSEECOMAPI_H_
#define __QSEECOMAPI_H_


/*----------------------------------------------------------------------------
 * Include Files
* -------------------------------------------------------------------------*/
#include <stdint.h>
#include <stdbool.h>

#define QSEECOM_ALIGN_SIZE	0x40
#define QSEECOM_ALIGN_MASK	(QSEECOM_ALIGN_SIZE - 1)
#define QSEECOM_ALIGN(x)	\
	((x + QSEECOM_ALIGN_SIZE) & (~QSEECOM_ALIGN_MASK))

#ifdef __cplusplus
extern "C" {
#endif

/*----------------------------------------------------------------------------
 * Preprocessor Definitions and Constants
 * -------------------------------------------------------------------------*/
/** The memory is locked and non-pageable */
#define MEM_LOCKED         0x00000001
/** The memory is marked non-cacheable */
#define MEM_NON_CACHED     0x00000002

#define QSEECOM_APP_QUERY_FAILED       -6
#define QSEECOM_APP_NOT_LOADED         -5
#define QSEECOM_APP_ALREADY_LOADED     -4
#define QSEECOM_LISTENER_UNREGISTERED	-3
#define QSEECOM_LISTENER_ALREADY_REGISTERED	-2
#define QSEECOM_LISTENER_REGISTER_FAIL		-1

/*----------------------------------------------------------------------------
 * Type Declarations
 * -------------------------------------------------------------------------*/
struct QSEECom_handle {
	unsigned char *ion_sbuffer;
};

struct QSEECom_ion_fd_data {
	int32_t fd;
	uint32_t cmd_buf_offset;
};

struct QSEECom_ion_fd_info {
	struct QSEECom_ion_fd_data data[4];
};

/*----------------------------------------------------------------------------
 * Function Declarations and Documentation
 * -------------------------------------------------------------------------*/
/**
 * @brief Open a handle to the  QSEECom device.
 *
 * - Load a secure application. The application will be verified that it is
 *    secure by digital signature verification.
 * Allocate memory for sending requests to the QSAPP
 *
 * Note/Comments:
 * There is a one-to-one relation for a HLOS client and a QSAPP;
 * meaning that only one app can communicate to a QSAPP at a time.
 *
 * Please note that there is difference between an application and a listener
 * service. A QSAPP must be loaded at the request of the HLOS,
 * and all requests are orginated by the HLOS client.
 * A listener service on the otherhand is started during start-up by a
 * daemon, qseecomd.
 *
 * A HLOS application may create mutiple handles to the QSAPP
 *
 * @param[in/out] handle The device handle
 * @param[in] fname The directory and filename to load.
 * @param[in] sb_size Size of the shared buffer memory  for sending requests.
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_start_app(struct QSEECom_handle **clnt_handle, const char *path,
			const char *fname, uint32_t sb_size);

/**
 * @brief Close the application associated with the handle.
 *
 * - Unload a secure application. The driver will verify if there exists
 *   any other applications that are communicating with the QSAPP to which
 *   the "handle" is tied.
 * - De-allocate memory for sending requests to QSAPP.
 *
 * @param[in] handle The device handle
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_shutdown_app(struct QSEECom_handle **handle);

/**
 * @brief Open a handle to the  QSEECom device.
 *
 * - Load an external elf. The elf will be verified that it is
 *    secure by digital signature verification.
 *
 * A HLOS application may create mutiple opens (only one is permitted for the
 * app, but each listener service can open a unique device in the same HLOS app
 * /executable.
 * @param[in/out] handle The device handle
 * @param[in] fname The directory and filename to load.
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_load_external_elf(struct QSEECom_handle **clnt_handle, const char *path,
			const char *fname);

/**
 * @brief Close the external elf
 *
 * - Unload an external elf.
 *
 * @param[in] handle The device handle
 *
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_unload_external_elf(struct QSEECom_handle **handle);

/**
 * @brief Register an HLOS listener service. This allows messages from QSAPP
 * to be received.
 *
 * @param[in] handle The device handle
 * @param[in] lstnr_id The listener service identifier. This ID must be uniquely
 * assigned to avoid any collisions.
 * @param[in] sb_length Shared memory buffer between OS and QSE.
 * @param[in] flags Provide the shared memory flags attributes.
 *
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 *
 */
int QSEECom_register_listener(struct QSEECom_handle **handle,
			uint32_t lstnr_id, uint32_t sb_length, uint32_t flags);

/**
 * @brief Unregister a listener service.
 *
 * @param[in] handle The device handle
 *
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_unregister_listener(struct QSEECom_handle *handle);


/**
 * @brief Send QSAPP a "user" defined buffer (may contain some message/
 * command request) and receives a response from QSAPP in receive buffer.
 * The HLOS client writes to the send_buf, where QSAPP writes to the rcv_buf.
 * This is a blocking call.
 *
 * @param[in] handle    The device handle
 * @param[in] send_buf  The buffer to be sent.
 *                      If using ion_sbuffer, ensure this
 *                      QSEECOM_BUFFER_ALIGN'ed.
 * @param[in] sbuf_len  The send buffer length
 *                      If using ion_sbuffer, ensure length is
 *                      multiple of QSEECOM_BUFFER_ALIGN.
 * @param[in] rcv_buf   The QSEOS returned buffer.
 *                      If using ion_sbuffer, ensure this is
 *                      QSEECOM_BUFFER_ALIGN'ed.
 * @param[in] rbuf_len  The returned buffer length.
 *                      If using ion_sbuffer, ensure length is
 *                      multiple of QSEECOM_BUFFER_ALIGN.
 * @param[in] rbuf_len  The returned buffer length.
 *
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_send_cmd(struct QSEECom_handle *handle, void *send_buf,
			uint32_t sbuf_len, void *rcv_buf, uint32_t rbuf_len);


/**
 * @brief Send QSAPP a "user" defined buffer (may contain some message/
 * command request) and receives a response from QSAPP in receive buffer.
 * This API is same as send_cmd except it takes in addition parameter,
 * "ifd_data".  This "ifd_data" holds information (ion fd handle and
 * cmd_buf_offset) used for modifying data in the message in send_buf
 * at an offset.  Essentailly, it has the ion fd handle information to
 * retrieve physical address and modify the message in send_buf at the
 * mentioned offset.
 *
 * The HLOS client writes to the send_buf, where QSAPP writes to the rcv_buf.
 * This is a blocking call.
 *
 * @param[in] handle    The device handle
 * @param[in] send_buf  The buffer to be sent.
 *                      If using ion_sbuffer, ensure this
 *                      QSEECOM_BUFFER_ALIGN'ed.
 * @param[in] sbuf_len  The send buffer length
 *                      If using ion_sbuffer, ensure length is
 *                      multiple of QSEECOM_BUFFER_ALIGN.
 * @param[in] rcv_buf   The QSEOS returned buffer.
 *                      If using ion_sbuffer, ensure this is
 *                      QSEECOM_BUFFER_ALIGN'ed.
 * @param[in] rbuf_len  The returned buffer length.
 *                      If using ion_sbuffer, ensure length is
 *                      multiple of QSEECOM_BUFFER_ALIGN.
 * @param[in] QSEECom_ion_fd_info  data related to memory allocated by ion.
 *
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_send_modified_cmd(struct QSEECom_handle *handle, void *send_buf,
			uint32_t sbuf_len, void *resp_buf, uint32_t rbuf_len,
			struct QSEECom_ion_fd_info  *ifd_data);

/**
 * @brief Receive a service defined buffer.
 *
 * @param[in] handle    The device handle
 * @param[out] buf      The buffer that is received
 * @param[in] len       The receive buffer length
 *
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_receive_req(struct QSEECom_handle *handle,
			void *buf, uint32_t len);

/**
 * @brief Send a response based on the previous QSEECom_receive_req.
 *
 * This allows a listener service to receive a command (e.g. read file abc).
 * The service can then handle the request from QSEECom_receive_req, and provide
 * that information back to QSAPP.
 *
 * This allows the HLOS to act as the server and QSAPP to behave as the client.
 *
 * @param[in] handle    The device handle
 * @param[out] send_buf  The buffer to be returned back to QSAPP
 * @param[in] len       The send buffer length
 *
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_send_resp(struct QSEECom_handle *handle,
			void *send_buf, uint32_t len);

/**
 * @brief Set the bandwidth for QSEE.
 *
 * This API resulst in improving the performance on the Crypto hardware
 * in QSEE. It should be called before issuing send_cmd/send_modified_cmd
 * for commands that requires using the crypto hardware on the QSEE.
 * Typically this API should be called before issuing the send request to
 * enable high performance mode and after completion of the send_cmd to
 * resume to low performance and hence to low power mode.
 *
 * This allows the clients of QSEECom to set the QSEE cyptpo HW bus
 * bandwidth to high/low.
 *
 * @param[in] high    Set to 1 to enable bandwidth.
 *
 * @return Zero on success, negative on failure. errno will be set on
 *  error.
 */
int QSEECom_set_bandwidth(struct QSEECom_handle *handle, bool high);

/**
 * @brief Query QSEE to check if app is loaded.
 *
 * This API queries QSEE to see if the app is loaded or not.
 *
 * @param[in] app_name  Name of the app.
 *
 * @return QSEECOM_APP_QUERY_FAILED/QSEECOM_APP_NOT_LOADED/QSEECOM_APP_LOADED.
 */
int QSEECom_app_load_query(struct QSEECom_handle *handle, char *app_name);

#ifdef __cplusplus
}
#endif

#endif