tzc400.h

/*
 * 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.
 */

#ifndef __TZC400_H__
#define __TZC400_H__

#include <stdint.h>

#define BUILD_CONFIG_OFF	0x000
#define ACTION_OFF		0x004
#define GATE_KEEPER_OFF		0x008
#define SPECULATION_CTRL_OFF	0x00c
#define INT_STATUS		0x010
#define INT_CLEAR		0x014

#define FAIL_ADDRESS_LOW_OFF	0x020
#define FAIL_ADDRESS_HIGH_OFF	0x024
#define FAIL_CONTROL_OFF	0x028
#define FAIL_ID			0x02c

#define REGION_BASE_LOW_OFF	0x100
#define REGION_BASE_HIGH_OFF	0x104
#define REGION_TOP_LOW_OFF	0x108
#define REGION_TOP_HIGH_OFF	0x10c
#define REGION_ATTRIBUTES_OFF	0x110
#define REGION_ID_ACCESS_OFF	0x114
#define REGION_NUM_OFF(region)  (0x20 * region)

/* ID Registers */
#define PID0_OFF		0xfe0
#define PID1_OFF		0xfe4
#define PID2_OFF		0xfe8
#define PID3_OFF		0xfec
#define PID4_OFF		0xfd0
#define PID5_OFF		0xfd4
#define PID6_OFF		0xfd8
#define PID7_OFF		0xfdc
#define CID0_OFF		0xff0
#define CID1_OFF		0xff4
#define CID2_OFF		0xff8
#define CID3_OFF		0xffc

#define BUILD_CONFIG_NF_SHIFT	24
#define BUILD_CONFIG_NF_MASK	0x3
#define BUILD_CONFIG_AW_SHIFT	8
#define BUILD_CONFIG_AW_MASK	0x3f
#define BUILD_CONFIG_NR_SHIFT	0
#define BUILD_CONFIG_NR_MASK	0x1f

/* Not describing the case where regions 1 to 8 overlap */
#define ACTION_RV_SHIFT		0
#define ACTION_RV_MASK		0x3
#define  ACTION_RV_LOWOK	0x0
#define  ACTION_RV_LOWERR	0x1
#define  ACTION_RV_HIGHOK	0x2
#define  ACTION_RV_HIGHERR	0x3

/*
 * Number of gate keepers is implementation defined. But we know the max for
 * this device is 4. Get implementation details from BUILD_CONFIG.
 */
#define GATE_KEEPER_OS_SHIFT	16
#define GATE_KEEPER_OS_MASK	0xf
#define GATE_KEEPER_OR_SHIFT	0
#define GATE_KEEPER_OR_MASK	0xf
#define GATE_KEEPER_FILTER_MASK	0x1

/* Speculation is enabled by default. */
#define SPECULATION_CTRL_WRITE_DISABLE	(1 << 1)
#define SPECULATION_CTRL_READ_DISABLE	(1 << 0)

/* Max number of filters allowed is 4. */
#define INT_STATUS_OVERLAP_SHIFT	16
#define INT_STATUS_OVERLAP_MASK		0xf
#define INT_STATUS_OVERRUN_SHIFT	8
#define INT_STATUS_OVERRUN_MASK		0xf
#define INT_STATUS_STATUS_SHIFT		0
#define INT_STATUS_STATUS_MASK		0xf

#define INT_CLEAR_CLEAR_SHIFT		0
#define INT_CLEAR_CLEAR_MASK		0xf

#define FAIL_CONTROL_DIR_SHIFT		(1 << 24)
#define  FAIL_CONTROL_DIR_READ		0x0
#define  FAIL_CONTROL_DIR_WRITE		0x1
#define FAIL_CONTROL_NS_SHIFT		(1 << 21)
#define  FAIL_CONTROL_NS_SECURE		0x0
#define  FAIL_CONTROL_NS_NONSECURE	0x1
#define FAIL_CONTROL_PRIV_SHIFT		(1 << 20)
#define  FAIL_CONTROL_PRIV_PRIV		0x0
#define  FAIL_CONTROL_PRIV_UNPRIV	0x1

/*
 * FAIL_ID_ID_MASK depends on AID_WIDTH which is platform specific.
 * Platform should provide the value on initialisation.
 */
#define FAIL_ID_VNET_SHIFT		24
#define FAIL_ID_VNET_MASK		0xf
#define FAIL_ID_ID_SHIFT		0

/* Used along with 'tzc_region_attributes_t' below */
#define REGION_ATTRIBUTES_SEC_SHIFT	30
#define REGION_ATTRIBUTES_F_EN_SHIFT	0
#define REGION_ATTRIBUTES_F_EN_MASK	0xf

#define REGION_ID_ACCESS_NSAID_WR_EN_SHIFT	16
#define REGION_ID_ACCESS_NSAID_RD_EN_SHIFT	0
#define REGION_ID_ACCESS_NSAID_ID_MASK		0xf


/* Macros for setting Region ID access permissions based on NSAID */
#define TZC_REGION_ACCESS_RD(id)					\
		((1 << (id & REGION_ID_ACCESS_NSAID_ID_MASK)) <<	\
		 REGION_ID_ACCESS_NSAID_RD_EN_SHIFT)
#define TZC_REGION_ACCESS_WR(id)					\
		((1 << (id & REGION_ID_ACCESS_NSAID_ID_MASK)) <<	\
		 REGION_ID_ACCESS_NSAID_WR_EN_SHIFT)
#define TZC_REGION_ACCESS_RDWR(id)					\
		(TZC_REGION_ACCESS_RD(id) | TZC_REGION_ACCESS_WR(id))

/* Filters are bit mapped 0 to 3. */
#define TZC400_COMPONENT_ID	0xb105f00d

/*******************************************************************************
 * Function & variable prototypes
 ******************************************************************************/

/*
 * What type of action is expected when an access violation occurs.
 * The memory requested is zeroed. But we can also raise and event to
 * let the system know it happened.
 * We can raise an interrupt(INT) and/or cause an exception(ERR).
 *  TZC_ACTION_NONE    - No interrupt, no Exception
 *  TZC_ACTION_ERR     - No interrupt, raise exception -> sync external
 *                       data abort
 *  TZC_ACTION_INT     - Raise interrupt, no exception
 *  TZC_ACTION_ERR_INT - Raise interrupt, raise exception -> sync
 *                       external data abort
 */
typedef enum {
	TZC_ACTION_NONE = 0,
	TZC_ACTION_ERR = 1,
	TZC_ACTION_INT = 2,
	TZC_ACTION_ERR_INT = (TZC_ACTION_ERR | TZC_ACTION_INT)
} tzc_action_t;

/*
 * Controls secure access to a region. If not enabled secure access is not
 * allowed to region.
 */
typedef enum {
	TZC_REGION_S_NONE = 0,
	TZC_REGION_S_RD = 1,
	TZC_REGION_S_WR = 2,
	TZC_REGION_S_RDWR = (TZC_REGION_S_RD | TZC_REGION_S_WR)
} tzc_region_attributes_t;

/*
 * Implementation defined values used to validate inputs later.
 * Filters : max of 4 ; 0 to 3
 * Regions : max of 9 ; 0 to 8
 * Address width : Values between 32 to 64
 */
typedef struct tzc_instance {
	uint64_t base;
	uint32_t aid_width;
	uint8_t addr_width;
	uint8_t num_filters;
	uint8_t num_regions;
} tzc_instance_t ;

void tzc_init(tzc_instance_t *controller);
void tzc_configure_region(const tzc_instance_t *controller, uint32_t filters,
	uint8_t region, uint64_t region_base, uint64_t region_top,
	tzc_region_attributes_t sec_attr, uint32_t ns_device_access);
void tzc_enable_filters(const tzc_instance_t *controller);
void tzc_disable_filters(const tzc_instance_t *controller);
void tzc_set_action(const tzc_instance_t *controller, tzc_action_t action);


#endif /* __TZC400__ */