| Deepa Dinamani | 1c2748d | 2015-01-12 11:57:09 -0800 | [diff] [blame] | 1 | /* Copyright (c) 2015, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <arch/cache.h> |
| 14 | #include <symbols.h> |
| 15 | #include "mmu.h" |
| 16 | |
| 17 | /* convenient shorthand (in MB) */ |
| 18 | #define RPM_START ((uintptr_t)_rpm / KiB) |
| 19 | #define RPM_END ((uintptr_t)_erpm / KiB) |
| 20 | #define RPM_SIZE (RPM_END - RPM_START) |
| 21 | #define SRAM_START ((uintptr_t)_sram / KiB) |
| 22 | #define SRAM_END ((uintptr_t)_esram / KiB) |
| 23 | #define DRAM_START ((uintptr_t)_dram / MiB) |
| 24 | #define DRAM_SIZE (CONFIG_DRAM_SIZE_MB) |
| 25 | #define DRAM_END (DRAM_START + DRAM_SIZE) |
| 26 | |
| 27 | /* DMA memory for drivers */ |
| 28 | #define DMA_START ((uintptr_t)_dma_coherent / MiB) |
| 29 | #define DMA_SIZE (_dma_coherent_size / MiB) |
| 30 | |
| 31 | void setup_dram_mappings(enum dram_state dram) |
| 32 | { |
| 33 | if (dram == DRAM_INITIALIZED) { |
| 34 | mmu_config_range(DRAM_START, DRAM_SIZE, DCACHE_WRITEBACK); |
| 35 | /* Map DMA memory */ |
| 36 | mmu_config_range(DMA_START, DMA_SIZE, DCACHE_OFF); |
| 37 | } else { |
| 38 | mmu_disable_range(DRAM_START, DRAM_SIZE); |
| 39 | /* Map DMA memory */ |
| 40 | mmu_disable_range(DMA_START, DMA_SIZE); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | void setup_mmu(enum dram_state dram) |
| 45 | { |
| 46 | dcache_mmu_disable(); |
| 47 | |
| 48 | /* start with mapping everything as strongly ordered. */ |
| 49 | mmu_config_range(0, 4096, DCACHE_OFF); |
| 50 | |
| 51 | /* Map Device memory. */ |
| 52 | mmu_config_range_kb(RPM_START, RPM_SIZE, DCACHE_OFF); |
| 53 | |
| Deepa Dinamani | 1c2748d | 2015-01-12 11:57:09 -0800 | [diff] [blame] | 54 | mmu_config_range_kb(SRAM_START, SRAM_END - SRAM_START, |
| 55 | DCACHE_WRITEBACK); |
| 56 | |
| 57 | /* Map DRAM memory */ |
| 58 | setup_dram_mappings(dram); |
| 59 | |
| 60 | mmu_disable_range(DRAM_END, 4096 - DRAM_END); |
| 61 | |
| Deepa Dinamani | a386bf7 | 2015-02-18 15:48:44 -0800 | [diff] [blame] | 62 | /* disable Page 0 for trapping NULL pointer references. */ |
| 63 | mmu_disable_range_kb(0, 1); |
| 64 | |
| Deepa Dinamani | 1c2748d | 2015-01-12 11:57:09 -0800 | [diff] [blame] | 65 | mmu_init(); |
| 66 | |
| 67 | dcache_mmu_enable(); |
| 68 | } |