plat_params.h

/*
 * Copyright (c) 2016, 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
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __PLAT_PARAMS_H__
#define __PLAT_PARAMS_H__

#include <stdint.h>

/*
 * We defined several plat parameter structs for BL2 to pass platform related
 * parameters to Rockchip BL31 platform code.  All plat parameters start with
 * a common header, which has a type field to indicate the parameter type, and
 * a next pointer points to next parameter. If the parameter is the last one in
 * the list, next pointer will points to NULL.  After the header comes the
 * variable-sized members that describe the parameter. The picture below shows
 * how the parameters are kept in memory.
 *
 * head of list  ---> +----------------+ --+
 *                    |      type      |   |
 *                    +----------------+   |--> struct bl31_plat_param
 *               +----|      next      |   |
 *               |    +----------------+ --+
 *               |    | parameter data |
 *               |    +----------------+
 *               |
 *               +--> +----------------+ --+
 *                    |      type      |   |
 *                    +----------------+   |--> struct bl31_plat_param
 *           NULL <---|      next      |   |
 *                    +----------------+ --+
 *                    | parameter data |
 *                    +----------------+
 *
 * Note: The SCTLR_EL3.A bit (Alignment fault check enable) of ARM TF is set,
 * so be sure each parameter struct starts on 64-bit aligned address. If not,
 * alignment fault will occur during accessing its data member.
 */

/* param type */
enum {
	PARAM_NONE = 0,
	PARAM_RESET,
	PARAM_POWEROFF,
};

struct gpio_info {
	uint8_t polarity;
	uint8_t direction;
	uint8_t pull_mode;
	uint32_t index;
};

/* common header for all plat parameter type */
struct bl31_plat_param {
	uint64_t type;
	void *next;
};

struct bl31_gpio_param {
	struct bl31_plat_param h;
	struct gpio_info gpio;
};

#endif /* __PLAT_PARAMS_H__ */