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/*
* This file is part of the coreboot project.
*
* Copyright 2018 MediaTek Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/mmu.h>
#include <symbols.h>
#include <soc/emi.h>
#include <soc/mmu_operations.h>
__weak void mtk_soc_after_dram(void) { /* do nothing */ }
void mtk_mmu_init(void)
{
mmu_init();
/*
* Set 0x0 to 4GB address as device memory. We want to config IO_PHYS
* address to DEV_MEM, and map a proper range of dram for the memory
* test during calibration.
*/
mmu_config_range((void *)0, (uintptr_t)4U * GiB, DEV_MEM);
/* SRAM is cached */
mmu_config_range(_sram, REGION_SIZE(sram), SECURE_CACHED_MEM);
/* L2C SRAM is cached */
mmu_config_range(_sram_l2c, REGION_SIZE(sram_l2c), SECURE_CACHED_MEM);
/* DMA is non-cached and is reserved for TPM & da9212 I2C DMA */
mmu_config_range(_dma_coherent, REGION_SIZE(dma_coherent),
SECURE_UNCACHED_MEM);
mmu_enable();
}
void mtk_mmu_after_dram(void)
{
/* Map DRAM as cached now that it's up and running */
mmu_config_range(_dram, (uintptr_t)sdram_size(), NONSECURE_CACHED_MEM);
mtk_soc_after_dram();
}
void mtk_mmu_disable_l2c_sram(void)
{
/* Unmap L2C SRAM so it can be reclaimed by L2 cache */
/* TODO: Implement true unmapping, and also use it for the zero-page! */
mmu_config_range(_sram_l2c, REGION_SIZE(sram_l2c), DEV_MEM);
/* Careful: changing cache geometry while it's active is a bad idea! */
mmu_disable();
mtk_soc_disable_l2c_sram();
/* Reenable MMU with now enlarged L2 cache. Page tables still valid. */
mmu_enable();
}
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