src/soc/mediatek/common/mmu_operations.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/mmu.h>
   4 #include <symbols.h>
   5 #include <soc/emi.h>
   6 #include <soc/mmu_operations.h>
   7
   8 __weak void mtk_soc_after_dram(void) { /* do nothing */ }
   9
  10 void mtk_mmu_init(void)
  11 {
  12         static bool mmu_inited;
  13
  14         if (mmu_inited)
  15                 return;
  16
  17         mmu_inited = true;
  18
  19         mmu_init();
  20
  21         /*
  22          * Set 0x0 to 16GB address as device memory. We want to config IO_PHYS
  23          * address to DEV_MEM, and map a proper range of dram for the memory
  24          * test during calibration.
  25          */
  26         mmu_config_range((void *)0, (uintptr_t)16U * GiB, DEV_MEM);
  27
  28         /* SRAM is cached */
  29         mmu_config_range(_sram, REGION_SIZE(sram), SECURE_CACHED_MEM);
  30
  31         /* L2C SRAM is cached */
  32         mmu_config_range(_sram_l2c, REGION_SIZE(sram_l2c), SECURE_CACHED_MEM);
  33
  34         /* DMA is non-cached and is reserved for TPM & da9212 I2C DMA */
  35         mmu_config_range(_dma_coherent, REGION_SIZE(dma_coherent),
  36                          SECURE_UNCACHED_MEM);
  37
  38         mmu_enable();
  39 }
  40
  41 void mtk_mmu_after_dram(void)
  42 {
  43         /* Map DRAM as cached now that it's up and running */
  44         mmu_config_range(_dram, (uintptr_t)sdram_size(), NONSECURE_CACHED_MEM);
  45
  46         mtk_soc_after_dram();
  47 }
  48
  49 void mtk_mmu_disable_l2c_sram(void)
  50 {
  51         /* Unmap L2C SRAM so it can be reclaimed by L2 cache */
  52         /* TODO: Implement true unmapping, and also use it for the zero-page! */
  53         mmu_config_range(_sram_l2c, REGION_SIZE(sram_l2c), DEV_MEM);
  54
  55         /* Careful: changing cache geometry while it's active is a bad idea! */
  56         mmu_disable();
  57
  58         mtk_soc_disable_l2c_sram();
  59
  60         /* Re-enable MMU with now enlarged L2 cache. Page tables still valid. */
  61         mmu_enable();
  62 }