plat/nvidia/tegra/drivers/memctrl/memctrl_v2.c - filogic/atf - Gitiles

 /*
  * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
  * Copyright (c) 2019-2020, NVIDIA Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <assert.h>
 #include <string.h>

 #include <arch_helpers.h>
 #include <common/bl_common.h>
 #include <common/debug.h>
 #include <lib/mmio.h>
 #include <lib/utils.h>
 #include <lib/xlat_tables/xlat_tables_v2.h>

 #include <mce.h>
 #include <memctrl.h>
 #include <memctrl_v2.h>
 #include <smmu.h>
 #include <tegra_def.h>
 #include <tegra_platform.h>
 #include <tegra_private.h>

 /* Video Memory base and size (live values) */
 static uint64_t video_mem_base;
 static uint64_t video_mem_size_mb;

 /*
  * Init Memory controller during boot.
  */
 void tegra_memctrl_setup(void)
 {
 	INFO("Tegra Memory Controller (v2)\n");

 	/* Initialize the System memory management unit */
 	tegra_smmu_init();

 	/* allow platforms to program custom memory controller settings */
 	plat_memctrl_setup();

 	/*
 	 * All requests at boot time, and certain requests during
 	 * normal run time, are physically addressed and must bypass
 	 * the SMMU. The client hub logic implements a hardware bypass
 	 * path around the Translation Buffer Units (TBU). During
 	 * boot-time, the SMMU_BYPASS_CTRL register (which defaults to
 	 * TBU_BYPASS mode) will be used to steer all requests around
 	 * the uninitialized TBUs. During normal operation, this register
 	 * is locked into TBU_BYPASS_SID config, which routes requests
 	 * with special StreamID 0x7f on the bypass path and all others
 	 * through the selected TBU. This is done to disable SMMU Bypass
 	 * mode, as it could be used to circumvent SMMU security checks.
 	 */
 	tegra_mc_write_32(MC_SMMU_BYPASS_CONFIG,
 			  MC_SMMU_BYPASS_CONFIG_SETTINGS);
 }

 /*
  * Restore Memory Controller settings after "System Suspend"
  */
 void tegra_memctrl_restore_settings(void)
 {
 	/* restore platform's memory controller settings */
 	plat_memctrl_restore();

 	/* video memory carveout region */
 	if (video_mem_base != 0ULL) {
 		tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_LO,
 				  (uint32_t)video_mem_base);
 		assert(tegra_mc_read_32(MC_VIDEO_PROTECT_BASE_LO)
 			 == (uint32_t)video_mem_base);
 		tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_HI,
 				  (uint32_t)(video_mem_base >> 32));
 		assert(tegra_mc_read_32(MC_VIDEO_PROTECT_BASE_HI)
 			 == (uint32_t)(video_mem_base >> 32));
 		tegra_mc_write_32(MC_VIDEO_PROTECT_SIZE_MB,
 				  (uint32_t)video_mem_size_mb);
 		assert(tegra_mc_read_32(MC_VIDEO_PROTECT_SIZE_MB)
 			 == (uint32_t)video_mem_size_mb);

 		/*
 		 * MCE propagates the VideoMem configuration values across the
 		 * CCPLEX.
 		 */
 		mce_update_gsc_videomem();
 	}
 }

 /*
  * Secure the BL31 DRAM aperture.
  *
  * phys_base = physical base of TZDRAM aperture
  * size_in_bytes = size of aperture in bytes
  */
 void tegra_memctrl_tzdram_setup(uint64_t phys_base, uint32_t size_in_bytes)
 {
 	/*
 	 * Perform platform specific steps.
 	 */
 	plat_memctrl_tzdram_setup(phys_base, size_in_bytes);
 }

 /*
  * Secure the BL31 TZRAM aperture.
  *
  * phys_base = physical base of TZRAM aperture
  * size_in_bytes = size of aperture in bytes
  */
 void tegra_memctrl_tzram_setup(uint64_t phys_base, uint32_t size_in_bytes)
 {
 	; /* do nothing */
 }

 /*
  * Save MC settings before "System Suspend" to TZDRAM
  */
 void tegra_mc_save_context(uint64_t mc_ctx_addr)
 {
 	uint32_t i, num_entries = 0;
 	mc_regs_t *mc_ctx_regs;
 	const plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params();
 	uint64_t tzdram_base = params_from_bl2->tzdram_base;
 	uint64_t tzdram_end = tzdram_base + params_from_bl2->tzdram_size;

 	assert((mc_ctx_addr >= tzdram_base) && (mc_ctx_addr <= tzdram_end));

 	/* get MC context table */
 	mc_ctx_regs = plat_memctrl_get_sys_suspend_ctx();
 	assert(mc_ctx_regs != NULL);

 	/*
 	 * mc_ctx_regs[0].val contains the size of the context table minus
 	 * the last entry. Sanity check the table size before we start with
 	 * the context save operation.
 	 */
 	while (mc_ctx_regs[num_entries].reg != 0xFFFFFFFFU) {
 		num_entries++;
 	}

 	/* panic if the sizes do not match */
 	if (num_entries != mc_ctx_regs[0].val) {
 		ERROR("MC context size mismatch!");
 		panic();
 	}

 	/* save MC register values */
 	for (i = 1U; i < num_entries; i++) {
 		mc_ctx_regs[i].val = mmio_read_32(mc_ctx_regs[i].reg);
 	}

 	/* increment by 1 to take care of the last entry */
 	num_entries++;

 	/* Save MC config settings */
 	(void)memcpy((void *)mc_ctx_addr, mc_ctx_regs,
 			sizeof(mc_regs_t) * num_entries);

 	/* save the MC table address */
 	mmio_write_32(TEGRA_SCRATCH_BASE + SCRATCH_MC_TABLE_ADDR_LO,
 		(uint32_t)mc_ctx_addr);
 	assert(mmio_read_32(TEGRA_SCRATCH_BASE + SCRATCH_MC_TABLE_ADDR_LO)
 		== (uint32_t)mc_ctx_addr);
 	mmio_write_32(TEGRA_SCRATCH_BASE + SCRATCH_MC_TABLE_ADDR_HI,
 		(uint32_t)(mc_ctx_addr >> 32));
 	assert(mmio_read_32(TEGRA_SCRATCH_BASE + SCRATCH_MC_TABLE_ADDR_HI)
 		== (uint32_t)(mc_ctx_addr >> 32));
 }

 static void tegra_lock_videomem_nonoverlap(uint64_t phys_base,
 					   uint64_t size_in_bytes)
 {
 	uint32_t index;
 	uint64_t total_128kb_blocks = size_in_bytes >> 17;
 	uint64_t residual_4kb_blocks = (size_in_bytes & (uint32_t)0x1FFFF) >> 12;
 	uint64_t val;

 	/*
 	 * Reset the access configuration registers to restrict access to
 	 * old Videomem aperture
 	 */
 	for (index = MC_VIDEO_PROTECT_CLEAR_ACCESS_CFG0;
 	     index < ((uint32_t)MC_VIDEO_PROTECT_CLEAR_ACCESS_CFG0 + (uint32_t)MC_GSC_CONFIG_REGS_SIZE);
 	     index += 4U) {
 		tegra_mc_write_32(index, 0);
 	}

 	/*
 	 * Set the base. It must be 4k aligned, at least.
 	 */
 	assert((phys_base & (uint64_t)0xFFF) == 0U);
 	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_BASE_LO, (uint32_t)phys_base);
 	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_BASE_HI,
 		(uint32_t)(phys_base >> 32) & (uint32_t)MC_GSC_BASE_HI_MASK);

 	/*
 	 * Set the aperture size
 	 *
 	 * total size = (number of 128KB blocks) + (number of remaining 4KB
 	 * blocks)
 	 *
 	 */
 	val = (uint32_t)((residual_4kb_blocks << MC_GSC_SIZE_RANGE_4KB_SHIFT) |
 			 total_128kb_blocks);
 	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_SIZE, (uint32_t)val);

 	/*
 	 * Lock the configuration settings by enabling TZ-only lock and
 	 * locking the configuration against any future changes from NS
 	 * world.
 	 */
 	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_CFG,
 			  (uint32_t)MC_GSC_ENABLE_TZ_LOCK_BIT);

 	/*
 	 * MCE propagates the GSC configuration values across the
 	 * CCPLEX.
 	 */
 }

 static void tegra_unlock_videomem_nonoverlap(void)
 {
 	/* Clear the base */
 	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_BASE_LO, 0);
 	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_BASE_HI, 0);

 	/* Clear the size */
 	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_SIZE, 0);
 }

 static void tegra_clear_videomem(uintptr_t non_overlap_area_start,
 				 unsigned long long non_overlap_area_size)
 {
 	int ret;

 	INFO("Cleaning previous Video Memory Carveout\n");

 	/*
 	 * Map the NS memory first, clean it and then unmap it.
 	 */
 	ret = mmap_add_dynamic_region(non_overlap_area_start, /* PA */
 				non_overlap_area_start, /* VA */
 				non_overlap_area_size, /* size */
 				MT_DEVICE | MT_RW | MT_NS); /* attrs */
 	assert(ret == 0);

 	zeromem((void *)non_overlap_area_start, non_overlap_area_size);
 	flush_dcache_range(non_overlap_area_start, non_overlap_area_size);

 	ret = mmap_remove_dynamic_region(non_overlap_area_start,
 		non_overlap_area_size);
 	assert(ret == 0);
 }

 static void tegra_clear_videomem_nonoverlap(uintptr_t phys_base,
 		unsigned long size_in_bytes)
 {
 	uintptr_t vmem_end_old = video_mem_base + (video_mem_size_mb << 20);
 	uintptr_t vmem_end_new = phys_base + size_in_bytes;
 	unsigned long long non_overlap_area_size;

 	/*
 	 * Clear the old regions now being exposed. The following cases
 	 * can occur -
 	 *
 	 * 1. clear whole old region (no overlap with new region)
 	 * 2. clear old sub-region below new base
 	 * 3. clear old sub-region above new end
 	 */
 	if ((phys_base > vmem_end_old) || (video_mem_base > vmem_end_new)) {
 		tegra_clear_videomem(video_mem_base,
 				     video_mem_size_mb << 20U);
 	} else {
 		if (video_mem_base < phys_base) {
 			non_overlap_area_size = phys_base - video_mem_base;
 			tegra_clear_videomem(video_mem_base, non_overlap_area_size);
 		}
 		if (vmem_end_old > vmem_end_new) {
 			non_overlap_area_size = vmem_end_old - vmem_end_new;
 			tegra_clear_videomem(vmem_end_new, non_overlap_area_size);
 		}
 	}
 }

 /*
  * Program the Video Memory carveout region
  *
  * phys_base = physical base of aperture
  * size_in_bytes = size of aperture in bytes
  */
 void tegra_memctrl_videomem_setup(uint64_t phys_base, uint32_t size_in_bytes)
 {
 	/*
 	 * Setup the Memory controller to restrict CPU accesses to the Video
 	 * Memory region
 	 */

 	INFO("Configuring Video Memory Carveout\n");

 	if (video_mem_base != 0U) {
 		/*
 		 * Lock the non overlapping memory being cleared so that
 		 * other masters do not accidently write to it. The memory
 		 * would be unlocked once the non overlapping region is
 		 * cleared and the new memory settings take effect.
 		 */
 		tegra_lock_videomem_nonoverlap(video_mem_base,
 			video_mem_size_mb << 20);
 	}

 	/* program the Videomem aperture */
 	tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_LO, (uint32_t)phys_base);
 	tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_HI,
 			  (uint32_t)(phys_base >> 32));
 	tegra_mc_write_32(MC_VIDEO_PROTECT_SIZE_MB, size_in_bytes >> 20);

 	/* Redundancy check for Video Protect setting */
 	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_BASE_LO)
 		 == (uint32_t)phys_base);
 	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_BASE_HI)
 		 == (uint32_t)(phys_base >> 32));
 	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_SIZE_MB)
 		 == (size_in_bytes >> 20));

 	/*
 	 * MCE propagates the VideoMem configuration values across the
 	 * CCPLEX.
 	 */
 	(void)mce_update_gsc_videomem();

 	/* Clear the non-overlapping memory */
 	if (video_mem_base != 0U) {
 		tegra_clear_videomem_nonoverlap(phys_base, size_in_bytes);
 		tegra_unlock_videomem_nonoverlap();
 	}

 	/* store new values */
 	video_mem_base = phys_base;
 	video_mem_size_mb = (uint64_t)size_in_bytes >> 20;
 }

 /*
  * This feature exists only for v1 of the Tegra Memory Controller.
  */
 void tegra_memctrl_disable_ahb_redirection(void)
 {
 	; /* do nothing */
 }

 void tegra_memctrl_clear_pending_interrupts(void)
 {
 	; /* do nothing */
 }
	/*
	* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
	* Copyright (c) 2019-2020, NVIDIA Corporation. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <assert.h>
	#include <string.h>

	#include <arch_helpers.h>
	#include <common/bl_common.h>
	#include <common/debug.h>
	#include <lib/mmio.h>
	#include <lib/utils.h>
	#include <lib/xlat_tables/xlat_tables_v2.h>

	#include <mce.h>
	#include <memctrl.h>
	#include <memctrl_v2.h>
	#include <smmu.h>
	#include <tegra_def.h>
	#include <tegra_platform.h>
	#include <tegra_private.h>

	/* Video Memory base and size (live values) */
	static uint64_t video_mem_base;
	static uint64_t video_mem_size_mb;

	/*
	* Init Memory controller during boot.
	*/
	void tegra_memctrl_setup(void)
	{
	INFO("Tegra Memory Controller (v2)\n");

	/* Initialize the System memory management unit */
	tegra_smmu_init();

	/* allow platforms to program custom memory controller settings */
	plat_memctrl_setup();

	/*
	* All requests at boot time, and certain requests during
	* normal run time, are physically addressed and must bypass
	* the SMMU. The client hub logic implements a hardware bypass
	* path around the Translation Buffer Units (TBU). During
	* boot-time, the SMMU_BYPASS_CTRL register (which defaults to
	* TBU_BYPASS mode) will be used to steer all requests around
	* the uninitialized TBUs. During normal operation, this register
	* is locked into TBU_BYPASS_SID config, which routes requests
	* with special StreamID 0x7f on the bypass path and all others
	* through the selected TBU. This is done to disable SMMU Bypass
	* mode, as it could be used to circumvent SMMU security checks.
	*/
	tegra_mc_write_32(MC_SMMU_BYPASS_CONFIG,
	MC_SMMU_BYPASS_CONFIG_SETTINGS);
	}

	/*
	* Restore Memory Controller settings after "System Suspend"
	*/
	void tegra_memctrl_restore_settings(void)
	{
	/* restore platform's memory controller settings */
	plat_memctrl_restore();

	/* video memory carveout region */
	if (video_mem_base != 0ULL) {
	tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_LO,
	(uint32_t)video_mem_base);
	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_BASE_LO)
	== (uint32_t)video_mem_base);
	tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_HI,
	(uint32_t)(video_mem_base >> 32));
	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_BASE_HI)
	== (uint32_t)(video_mem_base >> 32));
	tegra_mc_write_32(MC_VIDEO_PROTECT_SIZE_MB,
	(uint32_t)video_mem_size_mb);
	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_SIZE_MB)
	== (uint32_t)video_mem_size_mb);

	/*
	* MCE propagates the VideoMem configuration values across the
	* CCPLEX.
	*/
	mce_update_gsc_videomem();
	}
	}

	/*
	* Secure the BL31 DRAM aperture.
	*
	* phys_base = physical base of TZDRAM aperture
	* size_in_bytes = size of aperture in bytes
	*/
	void tegra_memctrl_tzdram_setup(uint64_t phys_base, uint32_t size_in_bytes)
	{
	/*
	* Perform platform specific steps.
	*/
	plat_memctrl_tzdram_setup(phys_base, size_in_bytes);
	}

	/*
	* Secure the BL31 TZRAM aperture.
	*
	* phys_base = physical base of TZRAM aperture
	* size_in_bytes = size of aperture in bytes
	*/
	void tegra_memctrl_tzram_setup(uint64_t phys_base, uint32_t size_in_bytes)
	{
	; /* do nothing */
	}

	/*
	* Save MC settings before "System Suspend" to TZDRAM
	*/
	void tegra_mc_save_context(uint64_t mc_ctx_addr)
	{
	uint32_t i, num_entries = 0;
	mc_regs_t *mc_ctx_regs;
	const plat_params_from_bl2_t *params_from_bl2 = bl31_get_plat_params();
	uint64_t tzdram_base = params_from_bl2->tzdram_base;
	uint64_t tzdram_end = tzdram_base + params_from_bl2->tzdram_size;

	assert((mc_ctx_addr >= tzdram_base) && (mc_ctx_addr <= tzdram_end));

	/* get MC context table */
	mc_ctx_regs = plat_memctrl_get_sys_suspend_ctx();
	assert(mc_ctx_regs != NULL);

	/*
	* mc_ctx_regs[0].val contains the size of the context table minus
	* the last entry. Sanity check the table size before we start with
	* the context save operation.
	*/
	while (mc_ctx_regs[num_entries].reg != 0xFFFFFFFFU) {
	num_entries++;
	}

	/* panic if the sizes do not match */
	if (num_entries != mc_ctx_regs[0].val) {
	ERROR("MC context size mismatch!");
	panic();
	}

	/* save MC register values */
	for (i = 1U; i < num_entries; i++) {
	mc_ctx_regs[i].val = mmio_read_32(mc_ctx_regs[i].reg);
	}

	/* increment by 1 to take care of the last entry */
	num_entries++;

	/* Save MC config settings */
	(void)memcpy((void *)mc_ctx_addr, mc_ctx_regs,
	sizeof(mc_regs_t) * num_entries);

	/* save the MC table address */
	mmio_write_32(TEGRA_SCRATCH_BASE + SCRATCH_MC_TABLE_ADDR_LO,
	(uint32_t)mc_ctx_addr);
	assert(mmio_read_32(TEGRA_SCRATCH_BASE + SCRATCH_MC_TABLE_ADDR_LO)
	== (uint32_t)mc_ctx_addr);
	mmio_write_32(TEGRA_SCRATCH_BASE + SCRATCH_MC_TABLE_ADDR_HI,
	(uint32_t)(mc_ctx_addr >> 32));
	assert(mmio_read_32(TEGRA_SCRATCH_BASE + SCRATCH_MC_TABLE_ADDR_HI)
	== (uint32_t)(mc_ctx_addr >> 32));
	}

	static void tegra_lock_videomem_nonoverlap(uint64_t phys_base,
	uint64_t size_in_bytes)
	{
	uint32_t index;
	uint64_t total_128kb_blocks = size_in_bytes >> 17;
	uint64_t residual_4kb_blocks = (size_in_bytes & (uint32_t)0x1FFFF) >> 12;
	uint64_t val;

	/*
	* Reset the access configuration registers to restrict access to
	* old Videomem aperture
	*/
	for (index = MC_VIDEO_PROTECT_CLEAR_ACCESS_CFG0;
	index < ((uint32_t)MC_VIDEO_PROTECT_CLEAR_ACCESS_CFG0 + (uint32_t)MC_GSC_CONFIG_REGS_SIZE);
	index += 4U) {
	tegra_mc_write_32(index, 0);
	}

	/*
	* Set the base. It must be 4k aligned, at least.
	*/
	assert((phys_base & (uint64_t)0xFFF) == 0U);
	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_BASE_LO, (uint32_t)phys_base);
	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_BASE_HI,
	(uint32_t)(phys_base >> 32) & (uint32_t)MC_GSC_BASE_HI_MASK);

	/*
	* Set the aperture size
	*
	* total size = (number of 128KB blocks) + (number of remaining 4KB
	* blocks)
	*
	*/
	val = (uint32_t)((residual_4kb_blocks << MC_GSC_SIZE_RANGE_4KB_SHIFT) \|
	total_128kb_blocks);
	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_SIZE, (uint32_t)val);

	/*
	* Lock the configuration settings by enabling TZ-only lock and
	* locking the configuration against any future changes from NS
	* world.
	*/
	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_CFG,
	(uint32_t)MC_GSC_ENABLE_TZ_LOCK_BIT);

	/*
	* MCE propagates the GSC configuration values across the
	* CCPLEX.
	*/
	}

	static void tegra_unlock_videomem_nonoverlap(void)
	{
	/* Clear the base */
	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_BASE_LO, 0);
	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_BASE_HI, 0);

	/* Clear the size */
	tegra_mc_write_32(MC_VIDEO_PROTECT_CLEAR_SIZE, 0);
	}

	static void tegra_clear_videomem(uintptr_t non_overlap_area_start,
	unsigned long long non_overlap_area_size)
	{
	int ret;

	INFO("Cleaning previous Video Memory Carveout\n");

	/*
	* Map the NS memory first, clean it and then unmap it.
	*/
	ret = mmap_add_dynamic_region(non_overlap_area_start, /* PA */
	non_overlap_area_start, /* VA */
	non_overlap_area_size, /* size */
	MT_DEVICE \| MT_RW \| MT_NS); /* attrs */
	assert(ret == 0);

	zeromem((void *)non_overlap_area_start, non_overlap_area_size);
	flush_dcache_range(non_overlap_area_start, non_overlap_area_size);

	ret = mmap_remove_dynamic_region(non_overlap_area_start,
	non_overlap_area_size);
	assert(ret == 0);
	}

	static void tegra_clear_videomem_nonoverlap(uintptr_t phys_base,
	unsigned long size_in_bytes)
	{
	uintptr_t vmem_end_old = video_mem_base + (video_mem_size_mb << 20);
	uintptr_t vmem_end_new = phys_base + size_in_bytes;
	unsigned long long non_overlap_area_size;

	/*
	* Clear the old regions now being exposed. The following cases
	* can occur -
	*
	* 1. clear whole old region (no overlap with new region)
	* 2. clear old sub-region below new base
	* 3. clear old sub-region above new end
	*/
	if ((phys_base > vmem_end_old) \|\| (video_mem_base > vmem_end_new)) {
	tegra_clear_videomem(video_mem_base,
	video_mem_size_mb << 20U);
	} else {
	if (video_mem_base < phys_base) {
	non_overlap_area_size = phys_base - video_mem_base;
	tegra_clear_videomem(video_mem_base, non_overlap_area_size);
	}
	if (vmem_end_old > vmem_end_new) {
	non_overlap_area_size = vmem_end_old - vmem_end_new;
	tegra_clear_videomem(vmem_end_new, non_overlap_area_size);
	}
	}
	}

	/*
	* Program the Video Memory carveout region
	*
	* phys_base = physical base of aperture
	* size_in_bytes = size of aperture in bytes
	*/
	void tegra_memctrl_videomem_setup(uint64_t phys_base, uint32_t size_in_bytes)
	{
	/*
	* Setup the Memory controller to restrict CPU accesses to the Video
	* Memory region
	*/

	INFO("Configuring Video Memory Carveout\n");

	if (video_mem_base != 0U) {
	/*
	* Lock the non overlapping memory being cleared so that
	* other masters do not accidently write to it. The memory
	* would be unlocked once the non overlapping region is
	* cleared and the new memory settings take effect.
	*/
	tegra_lock_videomem_nonoverlap(video_mem_base,
	video_mem_size_mb << 20);
	}

	/* program the Videomem aperture */
	tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_LO, (uint32_t)phys_base);
	tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_HI,
	(uint32_t)(phys_base >> 32));
	tegra_mc_write_32(MC_VIDEO_PROTECT_SIZE_MB, size_in_bytes >> 20);

	/* Redundancy check for Video Protect setting */
	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_BASE_LO)
	== (uint32_t)phys_base);
	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_BASE_HI)
	== (uint32_t)(phys_base >> 32));
	assert(tegra_mc_read_32(MC_VIDEO_PROTECT_SIZE_MB)
	== (size_in_bytes >> 20));

	/*
	* MCE propagates the VideoMem configuration values across the
	* CCPLEX.
	*/
	(void)mce_update_gsc_videomem();

	/* Clear the non-overlapping memory */
	if (video_mem_base != 0U) {
	tegra_clear_videomem_nonoverlap(phys_base, size_in_bytes);
	tegra_unlock_videomem_nonoverlap();
	}

	/* store new values */
	video_mem_base = phys_base;
	video_mem_size_mb = (uint64_t)size_in_bytes >> 20;
	}

	/*
	* This feature exists only for v1 of the Tegra Memory Controller.
	*/
	void tegra_memctrl_disable_ahb_redirection(void)
	{
	; /* do nothing */
	}

	void tegra_memctrl_clear_pending_interrupts(void)
	{
	; /* do nothing */
	}