arm_io_storage.c

/*
 * Copyright (c) 2015-2020, ARM Limited. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <common/debug.h>
#include <drivers/io/io_driver.h>
#include <drivers/io/io_fip.h>
#include <drivers/io/io_memmap.h>
#include <drivers/io/io_storage.h>
#include <lib/utils.h>

#include <plat/arm/common/arm_fconf_getter.h>
#include <plat/arm/common/arm_fconf_io_storage.h>
#include <plat/arm/common/plat_arm.h>
#include <plat/common/platform.h>
#include <platform_def.h>

/* IO devices */
static const io_dev_connector_t *fip_dev_con;
uintptr_t fip_dev_handle;
static const io_dev_connector_t *memmap_dev_con;
uintptr_t memmap_dev_handle;

/* Weak definitions may be overridden in specific ARM standard platform */
#pragma weak plat_arm_io_setup
#pragma weak plat_arm_get_alt_image_source

int open_fip(const uintptr_t spec)
{
	int result;
	uintptr_t local_image_handle;

	/* See if a Firmware Image Package is available */
	result = io_dev_init(fip_dev_handle, (uintptr_t)FIP_IMAGE_ID);
	if (result == 0) {
		result = io_open(fip_dev_handle, spec, &local_image_handle);
		if (result == 0) {
			VERBOSE("Using FIP\n");
			io_close(local_image_handle);
		}
	}
	return result;
}

int open_memmap(const uintptr_t spec)
{
	int result;
	uintptr_t local_image_handle;

	result = io_dev_init(memmap_dev_handle, (uintptr_t)NULL);
	if (result == 0) {
		result = io_open(memmap_dev_handle, spec, &local_image_handle);
		if (result == 0) {
			VERBOSE("Using Memmap\n");
			io_close(local_image_handle);
		}
	}
	return result;
}

int arm_io_setup(void)
{
	int io_result;

	io_result = register_io_dev_fip(&fip_dev_con);
	if (io_result < 0) {
		return io_result;
	}

	io_result = register_io_dev_memmap(&memmap_dev_con);
	if (io_result < 0) {
		return io_result;
	}

	/* Open connections to devices and cache the handles */
	io_result = io_dev_open(fip_dev_con, (uintptr_t)NULL,
				&fip_dev_handle);
	if (io_result < 0) {
		return io_result;
	}

	io_result = io_dev_open(memmap_dev_con, (uintptr_t)NULL,
				&memmap_dev_handle);

	return io_result;
}

void plat_arm_io_setup(void)
{
	int err;

	err = arm_io_setup();
	if (err < 0) {
		panic();
	}
}

int plat_arm_get_alt_image_source(
	unsigned int image_id __unused,
	uintptr_t *dev_handle __unused,
	uintptr_t *image_spec __unused)
{
	/* By default do not try an alternative */
	return -ENOENT;
}

/* Return an IO device handle and specification which can be used to access
 * an image. Use this to enforce platform load policy */
int plat_get_image_source(unsigned int image_id, uintptr_t *dev_handle,
			  uintptr_t *image_spec)
{
	int result;
	const struct plat_io_policy *policy;

	policy = FCONF_GET_PROPERTY(arm, io_policies, image_id);
	result = policy->check(policy->image_spec);
	if (result == 0) {
		*image_spec = policy->image_spec;
		*dev_handle = *(policy->dev_handle);
	} else {
		VERBOSE("Trying alternative IO\n");
		result = plat_arm_get_alt_image_source(image_id, dev_handle,
						       image_spec);
	}

	return result;
}

/*
 * See if a Firmware Image Package is available,
 * by checking if TOC is valid or not.
 */
bool arm_io_is_toc_valid(void)
{
	return (io_dev_init(fip_dev_handle, (uintptr_t)FIP_IMAGE_ID) == 0);
}