drivers/arm/tzc400/tzc400.c - filogic/atf - Gitiles

 /*
  * 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 <debug.h>
 #include <mmio.h>
 #include <stddef.h>
 #include <tzc400.h>

 static uint32_t tzc_read_build_config(uint64_t base)
 {
 	return mmio_read_32(base + BUILD_CONFIG_OFF);
 }

 static uint32_t tzc_read_gate_keeper(uint64_t base)
 {
 	return mmio_read_32(base + GATE_KEEPER_OFF);
 }

 static void tzc_write_gate_keeper(uint64_t base, uint32_t val)
 {
 	mmio_write_32(base + GATE_KEEPER_OFF, val);
 }

 static void tzc_write_action(uint64_t base, tzc_action_t action)
 {
 	mmio_write_32(base + ACTION_OFF, action);
 }

 static void tzc_write_region_base_low(uint64_t base, uint32_t region, uint32_t val)
 {
 	mmio_write_32(base + REGION_BASE_LOW_OFF + REGION_NUM_OFF(region), val);
 }

 static void tzc_write_region_base_high(uint64_t base, uint32_t region, uint32_t val)
 {
 	mmio_write_32(base + REGION_BASE_HIGH_OFF + REGION_NUM_OFF(region), val);
 }

 static void tzc_write_region_top_low(uint64_t base, uint32_t region, uint32_t val)
 {
 	mmio_write_32(base + REGION_TOP_LOW_OFF + REGION_NUM_OFF(region), val);
 }

 static void tzc_write_region_top_high(uint64_t base, uint32_t region, uint32_t val)
 {
 	mmio_write_32(base + REGION_TOP_HIGH_OFF + REGION_NUM_OFF(region), val);
 }

 static void tzc_write_region_attributes(uint64_t base, uint32_t region, uint32_t val)
 {
 	mmio_write_32(base + REGION_ATTRIBUTES_OFF + REGION_NUM_OFF(region), val);
 }

 static void tzc_write_region_id_access(uint64_t base, uint32_t region, uint32_t val)
 {
 	mmio_write_32(base + REGION_ID_ACCESS_OFF + REGION_NUM_OFF(region), val);
 }

 static uint32_t tzc_read_component_id(uint64_t base)
 {
 	uint32_t id;

 	id = mmio_read_8(base + CID0_OFF);
 	id |= (mmio_read_8(base + CID1_OFF) << 8);
 	id |= (mmio_read_8(base + CID2_OFF) << 16);
 	id |= (mmio_read_8(base + CID3_OFF) << 24);

 	return id;
 }

 static uint32_t tzc_get_gate_keeper(uint64_t base, uint8_t filter)
 {
 	uint32_t tmp;

 	tmp = (tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
 		GATE_KEEPER_OS_MASK;

 	return (tmp >> filter) & GATE_KEEPER_FILTER_MASK;
 }

 /* This function is not MP safe. */
 static void tzc_set_gate_keeper(uint64_t base, uint8_t filter, uint32_t val)
 {
 	uint32_t tmp;

 	/* Upper half is current state. Lower half is requested state. */
 	tmp = (tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
 		GATE_KEEPER_OS_MASK;

 	if (val)
 		tmp |=  (1 << filter);
 	else
 		tmp &= ~(1 << filter);

 	tzc_write_gate_keeper(base, (tmp & GATE_KEEPER_OR_MASK) <<
 			      GATE_KEEPER_OR_SHIFT);

 	/* Wait here until we see the change reflected in the TZC status. */
 	while (((tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
 		GATE_KEEPER_OS_MASK) != tmp)
 	  ;
 }


 void tzc_init(tzc_instance_t *controller)
 {
 	uint32_t tzc_id, tzc_build;

 	assert(controller != NULL);

 	/*
 	 * We expect to see a tzc400. Check component ID. The TZC-400 TRM shows
 	 * component ID is expected to be "0xB105F00D".
 	 */
 	tzc_id = tzc_read_component_id(controller->base);
 	if (tzc_id != TZC400_COMPONENT_ID) {
 		ERROR("TZC : Wrong device ID (0x%x).\n", tzc_id);
 		panic();
 	}

 	/* Save values we will use later. */
 	tzc_build = tzc_read_build_config(controller->base);
 	controller->num_filters = ((tzc_build >> BUILD_CONFIG_NF_SHIFT) &
 			   BUILD_CONFIG_NF_MASK) + 1;
 	controller->addr_width  = ((tzc_build >> BUILD_CONFIG_AW_SHIFT) &
 			   BUILD_CONFIG_AW_MASK) + 1;
 	controller->num_regions = ((tzc_build >> BUILD_CONFIG_NR_SHIFT) &
 			   BUILD_CONFIG_NR_MASK) + 1;
 }


 /*
  * `tzc_configure_region` is used to program regions into the TrustZone
  * controller. A region can be associated with more than one filter. The
  * associated filters are passed in as a bitmap (bit0 = filter0).
  * NOTE:
  * The region 0 covers the whole address space and is enabled on all filters,
  * this cannot be changed. It is, however, possible to change some region 0
  * permissions.
  */
 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)
 {
 	uint64_t max_addr;

 	assert(controller != NULL);

 	/* Do range checks on filters and regions. */
 	assert(((filters >> controller->num_filters) == 0) &&
 	       (region < controller->num_regions));

 	/*
 	 * Do address range check based on TZC configuration. A 64bit address is
 	 * the max and expected case.
 	 */
 	max_addr = UINT64_MAX >> (64 - controller->addr_width);
 	if ((region_top > max_addr) || (region_base >= region_top))
 		assert(0);

 	/* region_base and (region_top + 1) must be 4KB aligned */
 	assert(((region_base | (region_top + 1)) & (4096 - 1)) == 0);

 	assert(sec_attr <= TZC_REGION_S_RDWR);

 	/*
 	 * Inputs look ok, start programming registers.
 	 * All the address registers are 32 bits wide and have a LOW and HIGH
 	 * component used to construct a up to a 64bit address.
 	 */
 	tzc_write_region_base_low(controller->base, region, (uint32_t)(region_base));
 	tzc_write_region_base_high(controller->base, region, (uint32_t)(region_base >> 32));

 	tzc_write_region_top_low(controller->base, region, (uint32_t)(region_top));
 	tzc_write_region_top_high(controller->base, region, (uint32_t)(region_top >> 32));

 	/* Assign the region to a filter and set secure attributes */
 	tzc_write_region_attributes(controller->base, region,
 		(sec_attr << REGION_ATTRIBUTES_SEC_SHIFT) | filters);

 	/*
 	 * Specify which non-secure devices have permission to access this
 	 * region.
 	 */
 	tzc_write_region_id_access(controller->base, region, ns_device_access);
 }


 void tzc_set_action(const tzc_instance_t *controller, tzc_action_t action)
 {
 	assert(controller != NULL);

 	/*
 	 * - Currently no handler is provided to trap an error via interrupt
 	 *   or exception.
 	 * - The interrupt action has not been tested.
 	 */
 	tzc_write_action(controller->base, action);
 }


 void tzc_enable_filters(const tzc_instance_t *controller)
 {
 	uint32_t state;
 	uint32_t filter;

 	assert(controller != NULL);

 	for (filter = 0; filter < controller->num_filters; filter++) {
 		state = tzc_get_gate_keeper(controller->base, filter);
 		if (state) {
 			/* The TZC filter is already configured. Changing the
 			 * programmer's view in an active system can cause
 			 * unpredictable behavior therefore panic for now rather
 			 * than try to determine whether this is safe in this
 			 * instance. See:
 			 * http://infocenter.arm.com/help/index.jsp?\
 			 * topic=/com.arm.doc.ddi0504c/CJHHECBF.html */
 			ERROR("TZC : Filter %d Gatekeeper already enabled.\n",
 				filter);
 			panic();
 		}
 		tzc_set_gate_keeper(controller->base, filter, 1);
 	}
 }


 void tzc_disable_filters(const tzc_instance_t *controller)
 {
 	uint32_t filter;

 	assert(controller != NULL);

 	/*
 	 * We don't do the same state check as above as the Gatekeepers are
 	 * disabled after reset.
 	 */
 	for (filter = 0; filter < controller->num_filters; filter++)
 		tzc_set_gate_keeper(controller->base, filter, 0);
 }
	/*
	* 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 <debug.h>
	#include <mmio.h>
	#include <stddef.h>
	#include <tzc400.h>

	static uint32_t tzc_read_build_config(uint64_t base)
	{
	return mmio_read_32(base + BUILD_CONFIG_OFF);
	}

	static uint32_t tzc_read_gate_keeper(uint64_t base)
	{
	return mmio_read_32(base + GATE_KEEPER_OFF);
	}

	static void tzc_write_gate_keeper(uint64_t base, uint32_t val)
	{
	mmio_write_32(base + GATE_KEEPER_OFF, val);
	}

	static void tzc_write_action(uint64_t base, tzc_action_t action)
	{
	mmio_write_32(base + ACTION_OFF, action);
	}

	static void tzc_write_region_base_low(uint64_t base, uint32_t region, uint32_t val)
	{
	mmio_write_32(base + REGION_BASE_LOW_OFF + REGION_NUM_OFF(region), val);
	}

	static void tzc_write_region_base_high(uint64_t base, uint32_t region, uint32_t val)
	{
	mmio_write_32(base + REGION_BASE_HIGH_OFF + REGION_NUM_OFF(region), val);
	}

	static void tzc_write_region_top_low(uint64_t base, uint32_t region, uint32_t val)
	{
	mmio_write_32(base + REGION_TOP_LOW_OFF + REGION_NUM_OFF(region), val);
	}

	static void tzc_write_region_top_high(uint64_t base, uint32_t region, uint32_t val)
	{
	mmio_write_32(base + REGION_TOP_HIGH_OFF + REGION_NUM_OFF(region), val);
	}

	static void tzc_write_region_attributes(uint64_t base, uint32_t region, uint32_t val)
	{
	mmio_write_32(base + REGION_ATTRIBUTES_OFF + REGION_NUM_OFF(region), val);
	}

	static void tzc_write_region_id_access(uint64_t base, uint32_t region, uint32_t val)
	{
	mmio_write_32(base + REGION_ID_ACCESS_OFF + REGION_NUM_OFF(region), val);
	}

	static uint32_t tzc_read_component_id(uint64_t base)
	{
	uint32_t id;

	id = mmio_read_8(base + CID0_OFF);
	id \|= (mmio_read_8(base + CID1_OFF) << 8);
	id \|= (mmio_read_8(base + CID2_OFF) << 16);
	id \|= (mmio_read_8(base + CID3_OFF) << 24);

	return id;
	}

	static uint32_t tzc_get_gate_keeper(uint64_t base, uint8_t filter)
	{
	uint32_t tmp;

	tmp = (tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
	GATE_KEEPER_OS_MASK;

	return (tmp >> filter) & GATE_KEEPER_FILTER_MASK;
	}

	/* This function is not MP safe. */
	static void tzc_set_gate_keeper(uint64_t base, uint8_t filter, uint32_t val)
	{
	uint32_t tmp;

	/* Upper half is current state. Lower half is requested state. */
	tmp = (tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
	GATE_KEEPER_OS_MASK;

	if (val)
	tmp \|= (1 << filter);
	else
	tmp &= ~(1 << filter);

	tzc_write_gate_keeper(base, (tmp & GATE_KEEPER_OR_MASK) <<
	GATE_KEEPER_OR_SHIFT);

	/* Wait here until we see the change reflected in the TZC status. */
	while (((tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
	GATE_KEEPER_OS_MASK) != tmp)
	;
	}


	void tzc_init(tzc_instance_t *controller)
	{
	uint32_t tzc_id, tzc_build;

	assert(controller != NULL);

	/*
	* We expect to see a tzc400. Check component ID. The TZC-400 TRM shows
	* component ID is expected to be "0xB105F00D".
	*/
	tzc_id = tzc_read_component_id(controller->base);
	if (tzc_id != TZC400_COMPONENT_ID) {
	ERROR("TZC : Wrong device ID (0x%x).\n", tzc_id);
	panic();
	}

	/* Save values we will use later. */
	tzc_build = tzc_read_build_config(controller->base);
	controller->num_filters = ((tzc_build >> BUILD_CONFIG_NF_SHIFT) &
	BUILD_CONFIG_NF_MASK) + 1;
	controller->addr_width = ((tzc_build >> BUILD_CONFIG_AW_SHIFT) &
	BUILD_CONFIG_AW_MASK) + 1;
	controller->num_regions = ((tzc_build >> BUILD_CONFIG_NR_SHIFT) &
	BUILD_CONFIG_NR_MASK) + 1;
	}


	/*
	* `tzc_configure_region` is used to program regions into the TrustZone
	* controller. A region can be associated with more than one filter. The
	* associated filters are passed in as a bitmap (bit0 = filter0).
	* NOTE:
	* The region 0 covers the whole address space and is enabled on all filters,
	* this cannot be changed. It is, however, possible to change some region 0
	* permissions.
	*/
	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)
	{
	uint64_t max_addr;

	assert(controller != NULL);

	/* Do range checks on filters and regions. */
	assert(((filters >> controller->num_filters) == 0) &&
	(region < controller->num_regions));

	/*
	* Do address range check based on TZC configuration. A 64bit address is
	* the max and expected case.
	*/
	max_addr = UINT64_MAX >> (64 - controller->addr_width);
	if ((region_top > max_addr) \|\| (region_base >= region_top))
	assert(0);

	/* region_base and (region_top + 1) must be 4KB aligned */
	assert(((region_base \| (region_top + 1)) & (4096 - 1)) == 0);

	assert(sec_attr <= TZC_REGION_S_RDWR);

	/*
	* Inputs look ok, start programming registers.
	* All the address registers are 32 bits wide and have a LOW and HIGH
	* component used to construct a up to a 64bit address.
	*/
	tzc_write_region_base_low(controller->base, region, (uint32_t)(region_base));
	tzc_write_region_base_high(controller->base, region, (uint32_t)(region_base >> 32));

	tzc_write_region_top_low(controller->base, region, (uint32_t)(region_top));
	tzc_write_region_top_high(controller->base, region, (uint32_t)(region_top >> 32));

	/* Assign the region to a filter and set secure attributes */
	tzc_write_region_attributes(controller->base, region,
	(sec_attr << REGION_ATTRIBUTES_SEC_SHIFT) \| filters);

	/*
	* Specify which non-secure devices have permission to access this
	* region.
	*/
	tzc_write_region_id_access(controller->base, region, ns_device_access);
	}


	void tzc_set_action(const tzc_instance_t *controller, tzc_action_t action)
	{
	assert(controller != NULL);

	/*
	* - Currently no handler is provided to trap an error via interrupt
	* or exception.
	* - The interrupt action has not been tested.
	*/
	tzc_write_action(controller->base, action);
	}


	void tzc_enable_filters(const tzc_instance_t *controller)
	{
	uint32_t state;
	uint32_t filter;

	assert(controller != NULL);

	for (filter = 0; filter < controller->num_filters; filter++) {
	state = tzc_get_gate_keeper(controller->base, filter);
	if (state) {
	/* The TZC filter is already configured. Changing the
	* programmer's view in an active system can cause
	* unpredictable behavior therefore panic for now rather
	* than try to determine whether this is safe in this
	* instance. See:
	* http://infocenter.arm.com/help/index.jsp?\
	* topic=/com.arm.doc.ddi0504c/CJHHECBF.html */
	ERROR("TZC : Filter %d Gatekeeper already enabled.\n",
	filter);
	panic();
	}
	tzc_set_gate_keeper(controller->base, filter, 1);
	}
	}


	void tzc_disable_filters(const tzc_instance_t *controller)
	{
	uint32_t filter;

	assert(controller != NULL);

	/*
	* We don't do the same state check as above as the Gatekeepers are
	* disabled after reset.
	*/
	for (filter = 0; filter < controller->num_filters; filter++)
	tzc_set_gate_keeper(controller->base, filter, 0);
	}