/* Copyright (c) 2015, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * 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/cache.h> #include <rules.h> #include <soc/soc_services.h> #include <symbols.h> #include "mmu.h" /* convenient shorthand (in MB) */ #define RPM_START ((uintptr_t)_rpm / KiB) #define RPM_END ((uintptr_t)_erpm / KiB) #define RPM_SIZE (RPM_END - RPM_START) #define SRAM_START ((uintptr_t)_sram / KiB) #define SRAM_END ((uintptr_t)_esram / KiB) #define DRAM_START ((uintptr_t)_dram / MiB) #define DRAM_SIZE (CONFIG_DRAM_SIZE_MB) #define DRAM_END (DRAM_START + DRAM_SIZE) /* DMA memory for drivers */ #define DMA_START ((uintptr_t)_dma_coherent / MiB) #define DMA_SIZE (_dma_coherent_size / MiB) void setup_dram_mappings(enum dram_state dram) { if (dram == DRAM_INITIALIZED) { mmu_config_range(DRAM_START, DRAM_SIZE, DCACHE_WRITEBACK); /* Map DMA memory */ mmu_config_range(DMA_START, DMA_SIZE, DCACHE_OFF); #if ENV_ROMSTAGE /* Mark cbmem backing store as ready. */ ipq_cbmem_backing_store_ready(); #endif } else { mmu_disable_range(DRAM_START, DRAM_SIZE); /* Map DMA memory */ mmu_disable_range(DMA_START, DMA_SIZE); } } void setup_mmu(enum dram_state dram) { dcache_mmu_disable(); /* start with mapping everything as strongly ordered. */ mmu_config_range(0, 4096, DCACHE_OFF); /* Map Device memory. */ mmu_config_range_kb(RPM_START, RPM_SIZE, DCACHE_OFF); mmu_config_range_kb(SRAM_START, SRAM_END - SRAM_START, DCACHE_WRITEBACK); /* Map DRAM memory */ setup_dram_mappings(dram); mmu_disable_range(DRAM_END, 4096 - DRAM_END); /* disable Page 0 for trapping NULL pointer references. */ mmu_disable_range_kb(0, 1); mmu_init(); dcache_mmu_enable(); }