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/*
* notify_driver.c
*
* Syslink driver support for OMAP Processors.
*
* Copyright (C) 2008-2009 Texas Instruments, Inc.
*
* This package 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 PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <asm/pgtable.h>
#include <syslink/gt.h>
#include <syslink/notify.h>
#include <syslink/notify_driver.h>
#include <syslink/notifydefs.h>
#include <syslink/atomic_linux.h>
/* Function to register driver with the Notify module. */
int notify_register_driver(u16 remote_proc_id,
u16 line_id,
struct notify_driver_fxn_table *fxn_table,
struct notify_driver_object **driver_handle)
{
int status = NOTIFY_S_SUCCESS;
struct notify_driver_object *drv_handle = NULL;
if (WARN_ON(atomic_cmpmask_and_lt(&(notify_state.ref_count),
NOTIFY_MAKE_MAGICSTAMP(0),
NOTIFY_MAKE_MAGICSTAMP(1)) == true)) {
status = NOTIFY_E_INVALIDSTATE;
goto exit;
}
if (WARN_ON(fxn_table == NULL)) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
if (WARN_ON(remote_proc_id >= multiproc_get_num_processors())) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
if (WARN_ON(line_id >= NOTIFY_MAX_INTLINES)) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
if (WARN_ON(driver_handle == NULL)) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
*driver_handle = NULL;
if (mutex_lock_interruptible(notify_state.gate_handle) != 0)
WARN_ON(1);
drv_handle = &(notify_state.drivers[remote_proc_id][line_id]);
if (drv_handle->is_init == NOTIFY_DRIVERINITSTATUS_DONE) {
status = NOTIFY_E_ALREADYEXISTS;
mutex_unlock(notify_state.gate_handle);
goto exit;
}
mutex_unlock(notify_state.gate_handle);
WARN_ON(status < 0);
/*Complete registration of the driver. */
memcpy(&(drv_handle->fxn_table), fxn_table,
sizeof(struct notify_driver_fxn_table));
drv_handle->notify_handle = NULL; /* Initialize to NULL. */
drv_handle->is_init = NOTIFY_DRIVERINITSTATUS_DONE;
*driver_handle = drv_handle;
exit:
return status;
}
EXPORT_SYMBOL(notify_register_driver);
/* Function to unregister driver with the Notify module. */
int notify_unregister_driver(struct notify_driver_object *drv_handle)
{
int status = NOTIFY_E_FAIL;
s32 key;
if (WARN_ON(atomic_cmpmask_and_lt(&(notify_state.ref_count),
NOTIFY_MAKE_MAGICSTAMP(0),
NOTIFY_MAKE_MAGICSTAMP(1)) == true)) {
status = NOTIFY_E_INVALIDSTATE;
goto exit;
}
if (WARN_ON(drv_handle == NULL)) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
key = mutex_lock_interruptible(notify_state.gate_handle);
if (key)
goto exit;
/* Unregister the driver. */
drv_handle->is_init = NOTIFY_DRIVERINITSTATUS_NOTDONE;
mutex_unlock(notify_state.gate_handle);
status = NOTIFY_S_SUCCESS;
exit:
return status;
}
EXPORT_SYMBOL(notify_unregister_driver);
/* Function to set the Notify object handle maintained within the
* Notify module. */
int notify_set_driver_handle(u16 remote_proc_id, u16 line_id,
struct notify_object *handle)
{
s32 status = NOTIFY_S_SUCCESS;
/* Handle can be set to NULL */
if (WARN_ON(atomic_cmpmask_and_lt(&(notify_state.ref_count),
NOTIFY_MAKE_MAGICSTAMP(0),
NOTIFY_MAKE_MAGICSTAMP(1)) == true)) {
status = NOTIFY_E_INVALIDSTATE;
goto exit;
}
if (WARN_ON(remote_proc_id >= multiproc_get_num_processors())) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
if (WARN_ON(line_id >= NOTIFY_MAX_INTLINES)) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
notify_state.drivers[remote_proc_id][line_id].notify_handle = handle;
exit:
return status;
}
EXPORT_SYMBOL(notify_set_driver_handle);
/* Function to find and return the driver handle maintained within
* the Notify module. */
struct notify_driver_object *notify_get_driver_handle(u16 remote_proc_id,
u16 line_id)
{
struct notify_driver_object *handle = NULL;
s32 status = NOTIFY_S_SUCCESS;
if (WARN_ON(atomic_cmpmask_and_lt(&(notify_state.ref_count),
NOTIFY_MAKE_MAGICSTAMP(0),
NOTIFY_MAKE_MAGICSTAMP(1)) == true)) {
status = NOTIFY_E_INVALIDSTATE;
goto exit;
}
if (WARN_ON(remote_proc_id >= multiproc_get_num_processors())) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
if (WARN_ON(line_id >= NOTIFY_MAX_INTLINES)) {
status = NOTIFY_E_INVALIDARG;
goto exit;
}
handle = &(notify_state.drivers[remote_proc_id][line_id]);
/* Check whether the driver handle slot is occupied. */
if (handle->is_init == NOTIFY_DRIVERINITSTATUS_NOTDONE)
handle = NULL;
exit:
if (status < 0) {
pr_err("notify_get_driver_handle failed! "
"status = 0x%x\n", status);
}
return handle;
}
EXPORT_SYMBOL(notify_get_driver_handle);
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