src/soc/intel/common/block/include/intelblocks/vtd.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef SOC_INTEL_COMMON_BLOCK_VTD_H
   4 #define SOC_INTEL_COMMON_BLOCK_VTD_H
   5
   6 #include <device/mmio.h>
   7 #include <stdint.h>
   8
   9 /* VT-d specification: https://cdrdv2.intel.com/v1/dl/getContent/671081 */
  10 #define VER_REG         0x0
  11 #define CAP_REG         0x8
  12 #define  CAP_PMR_LO     BIT(5)
  13 #define  CAP_PMR_HI     BIT(6)
  14 #define PMEN_REG        0x64
  15 #define   PMEN_EPM      BIT(31)
  16 #define   PMEN_PRS      BIT(0)
  17 #define PLMBASE_REG     0x68
  18 #define PLMLIMIT_REG    0x6C
  19 #define PHMBASE_REG     0x70
  20 #define PHMLIMIT_REG    0x78
  21
  22 static __always_inline uint32_t vtd_read32(uintptr_t vtd_base, uint32_t reg)
  23 {
  24         return read32p(vtd_base + reg);
  25 }
  26
  27 static __always_inline void vtd_write32(uintptr_t vtd_base, uint32_t reg, uint32_t value)
  28 {
  29         return write32p(vtd_base + reg, value);
  30 }
  31
  32 static __always_inline uint64_t vtd_read64(uintptr_t vtd_base, uint32_t reg)
  33 {
  34         return read64p(vtd_base + reg);
  35 }
  36
  37 static __always_inline void vtd_write64(uintptr_t vtd_base, uint32_t reg, uint64_t value)
  38 {
  39         return write64p(vtd_base + reg, value);
  40 }
  41
  42 /*
  43  * Enable DMA protection by setting PMR registers in VT-d for whole DRAM memory.
  44  */
  45 void vtd_enable_dma_protection(void);
  46 /*
  47  * Get DMA buffer base and size.
  48  */
  49 void *vtd_get_dma_buffer(size_t *size);
  50
  51 #endif /* SOC_INTEL_COMMON_BLOCK_VTD_H */