/*
 * Copyright (c) 2014, ARM Limited and Contributors. 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 ARM 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 HOLDER 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.
 */

#include <assert.h>
#include <io_storage.h>
#include <platform.h>
#include <platform_def.h>
#include <spinlock.h>
#include <status.h>
#include <string.h>
#include <tftf_lib.h>

#if USE_NVM
/* Used to serialize write operations from different CPU's */
static spinlock_t flash_access_lock;
#endif

STATUS tftf_nvm_write(unsigned long long offset, const void *buffer, size_t size)
{
#if USE_NVM
	int ret;
	uintptr_t nvm_handle;
	size_t length_written;
#endif

	if (offset + size > TFTF_NVM_SIZE)
		return STATUS_OUT_OF_RESOURCES;

#if USE_NVM
	/* Obtain a handle to the NVM by querying the platfom layer */
	plat_get_nvm_handle(&nvm_handle);

	spin_lock(&flash_access_lock);

	ret = io_seek(nvm_handle, IO_SEEK_SET,
					offset + TFTF_NVM_OFFSET);
	if (ret != IO_SUCCESS)
		goto fail;

	ret = io_write(nvm_handle, (const uintptr_t)buffer, size,
							 &length_written);
	if (ret != IO_SUCCESS)
		goto fail;

	assert(length_written == size);
fail:
	spin_unlock(&flash_access_lock);

	if (ret != IO_SUCCESS)
		return STATUS_FAIL;

#else
	uintptr_t addr = DRAM_BASE + TFTF_NVM_OFFSET + offset;
	memcpy((void *)addr, buffer, size);
#endif

	return STATUS_SUCCESS;
}

STATUS tftf_nvm_read(unsigned long long offset, void *buffer, size_t size)
{
#if USE_NVM
	int ret;
	uintptr_t nvm_handle;
	size_t length_read;
#endif

	if (offset + size > TFTF_NVM_SIZE)
		return STATUS_OUT_OF_RESOURCES;

#if USE_NVM
	/* Obtain a handle to the NVM by querying the platfom layer */
	plat_get_nvm_handle(&nvm_handle);

	spin_lock(&flash_access_lock);

	ret = io_seek(nvm_handle, IO_SEEK_SET, TFTF_NVM_OFFSET + offset);
	if (ret != IO_SUCCESS)
		goto fail;

	ret = io_read(nvm_handle, (uintptr_t)buffer, size, &length_read);
	if (ret != IO_SUCCESS)
		goto fail;

	assert(length_read == size);
fail:
	spin_unlock(&flash_access_lock);

	if (ret != IO_SUCCESS)
		return STATUS_FAIL;
#else
	uintptr_t addr = DRAM_BASE + TFTF_NVM_OFFSET + offset;
	memcpy(buffer, (void *)addr, size);
#endif

	return STATUS_SUCCESS;
}