| /* 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 <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); |
| } 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(); |
| } |