Merge pull request #629 from ljerry/tf_issue_398
Bring IO storage dummy driver
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danh-arm
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f9455cea8c
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/*
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* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <debug.h>
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#include <io_driver.h>
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#include <io_storage.h>
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#include <string.h>
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struct file_state {
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int in_use;
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size_t size;
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};
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static struct file_state current_file = {0};
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/* Identify the device type as dummy */
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io_type_t device_type_dummy(void)
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{
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return IO_TYPE_DUMMY;
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}
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/* Dummy device functions */
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static int dummy_dev_open(const uintptr_t dev_spec, io_dev_info_t **dev_info);
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static int dummy_block_open(io_dev_info_t *dev_info, const uintptr_t spec,
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io_entity_t *entity);
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static int dummy_block_len(io_entity_t *entity, size_t *length);
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static int dummy_block_read(io_entity_t *entity, uintptr_t buffer,
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size_t length, size_t *length_read);
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static int dummy_block_close(io_entity_t *entity);
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static int dummy_dev_close(io_dev_info_t *dev_info);
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static const io_dev_connector_t dummy_dev_connector = {
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.dev_open = dummy_dev_open
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};
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static const io_dev_funcs_t dummy_dev_funcs = {
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.type = device_type_dummy,
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.open = dummy_block_open,
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.seek = NULL,
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.size = dummy_block_len,
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.read = dummy_block_read,
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.write = NULL,
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.close = dummy_block_close,
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.dev_init = NULL,
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.dev_close = dummy_dev_close,
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};
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static const io_dev_info_t dummy_dev_info = {
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.funcs = &dummy_dev_funcs,
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.info = (uintptr_t)NULL
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};
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/* Open a connection to the dummy device */
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static int dummy_dev_open(const uintptr_t dev_spec __attribute__((unused)),
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io_dev_info_t **dev_info)
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{
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assert(dev_info != NULL);
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*dev_info = (io_dev_info_t *)&dummy_dev_info;
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return 0;
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}
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/* Close a connection to the dummy device */
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static int dummy_dev_close(io_dev_info_t *dev_info)
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{
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return 0;
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}
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/* Open a file on the dummy device */
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static int dummy_block_open(io_dev_info_t *dev_info, const uintptr_t spec,
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io_entity_t *entity)
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{
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int result;
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const io_block_spec_t *block_spec = (io_block_spec_t *)spec;
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if (current_file.in_use == 0) {
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assert(block_spec != NULL);
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assert(entity != NULL);
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current_file.in_use = 1;
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current_file.size = block_spec->length;
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entity->info = (uintptr_t)¤t_file;
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result = 0;
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} else {
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WARN("A Dummy device is already active. Close first.\n");
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result = -ENOMEM;
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}
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return result;
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}
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/* Return the size of a file on the dummy device */
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static int dummy_block_len(io_entity_t *entity, size_t *length)
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{
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assert(entity != NULL);
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assert(length != NULL);
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*length = ((struct file_state *)entity->info)->size;
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return 0;
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}
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/* Read data from a file on the dummy device */
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static int dummy_block_read(io_entity_t *entity, uintptr_t buffer,
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size_t length, size_t *length_read)
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{
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assert(length_read != NULL);
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*length_read = length;
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return 0;
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}
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/* Close a file on the dummy device */
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static int dummy_block_close(io_entity_t *entity)
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{
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assert(entity != NULL);
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entity->info = 0;
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current_file.in_use = 0;
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return 0;
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}
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/* Exported functions */
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/* Register the dummy driver with the IO abstraction */
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int register_io_dev_dummy(const io_dev_connector_t **dev_con)
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{
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int result;
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assert(dev_con != NULL);
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result = io_register_device(&dummy_dev_info);
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if (result == 0)
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*dev_con = &dummy_dev_connector;
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return result;
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}
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@ -0,0 +1,36 @@
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/*
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* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __IO_DUMMY_H__
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#define __IO_DUMMY_H__
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int register_io_dev_dummy(const struct io_dev_connector **dev_con);
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#endif /* __IO_DUMMY_H__ */
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@ -43,6 +43,7 @@ typedef enum {
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IO_TYPE_INVALID,
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IO_TYPE_SEMIHOSTING,
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IO_TYPE_MEMMAP,
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IO_TYPE_DUMMY,
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IO_TYPE_FIRMWARE_IMAGE_PACKAGE,
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IO_TYPE_BLOCK,
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IO_TYPE_MAX
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