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Diffstat (limited to 'drivers/scsi/isci/state_machine.h')
| -rw-r--r-- | drivers/scsi/isci/state_machine.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/scsi/isci/state_machine.h b/drivers/scsi/isci/state_machine.h new file mode 100644 index 000000000000..c29eb4271d05 --- /dev/null +++ b/drivers/scsi/isci/state_machine.h @@ -0,0 +1,155 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License 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. + * The full GNU General Public License is included in this distribution + * in the file called LICENSE.GPL. + * + * BSD LICENSE + * + * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _SCI_BASE_STATE_MACHINE_H_ +#define _SCI_BASE_STATE_MACHINE_H_ + +#include <linux/types.h> + +typedef void (*sci_base_state_handler_t)(void); + +typedef void (*sci_state_transition_t)(void *base_object); + +/** + * struct sci_base_state - The base state object abstracts the fields common to + * all state objects defined in SCI. + * + * + */ +struct sci_base_state { + /** + * This field is a function pointer that defines the method to be + * invoked when the state is entered. + */ + sci_state_transition_t enter_state; + + /** + * This field is a function pointer that defines the method to be + * invoked when the state is exited. + */ + sci_state_transition_t exit_state; + +}; + +/** + * SET_STATE_HANDLER() - + * + * This macro simply provides simplified retrieval of an objects state handler. + */ +#define SET_STATE_HANDLER(object, table, state) \ + (object)->state_handlers = &(table)[(state)] + +/** + * struct sci_base_state_machine - This structure defines the fields common to + * all state machines. + * + * + */ +struct sci_base_state_machine { + /** + * This field points to the start of the state machine's state table. + */ + const struct sci_base_state *state_table; + + /** + * This field points to the object to which this state machine is + * associated. It serves as a cookie to be provided to the state + * enter/exit methods. + */ + void *state_machine_owner; + + /** + * This field simply indicates the state value for the state machine's + * initial state. + */ + u32 initial_state_id; + + /** + * This field indicates the current state of the state machine. + */ + u32 current_state_id; + + /** + * This field indicates the previous state of the state machine. + */ + u32 previous_state_id; + +}; + +/* + * ****************************************************************************** + * * P R O T E C T E D M E T H O D S + * ****************************************************************************** */ + +void sci_base_state_machine_construct( + struct sci_base_state_machine *this_state_machine, + void *state_machine_owner, + const struct sci_base_state *state_table, + u32 initial_state); + +void sci_base_state_machine_start( + struct sci_base_state_machine *this_state_machine); + +void sci_base_state_machine_stop( + struct sci_base_state_machine *this_state_machine); + +void sci_base_state_machine_change_state( + struct sci_base_state_machine *this_state_machine, + u32 next_state); + +u32 sci_base_state_machine_get_state( + struct sci_base_state_machine *this_state_machine); + +#endif /* _SCI_BASE_STATE_MACHINE_H_ */ |
