arch/arm/include/asm/armv7m_mpu.h

   1 /*
   2  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   3  * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 enum region_number {
   9         REGION_0 = 0,
  10         REGION_1,
  11         REGION_2,
  12         REGION_3,
  13         REGION_4,
  14         REGION_5,
  15         REGION_6,
  16         REGION_7,
  17 };
  18
  19 enum ap {
  20         NO_ACCESS = 0,
  21         PRIV_RW_USR_NO,
  22         PRIV_RW_USR_RO,
  23         PRIV_RW_USR_RW,
  24         UNPREDICTABLE,
  25         PRIV_RO_USR_NO,
  26         PRIV_RO_USR_RO,
  27 };
  28
  29 enum mr_attr {
  30         STRONG_ORDER = 0,
  31         SHARED_WRITE_BUFFERED,
  32         O_I_WT_NO_WR_ALLOC,
  33         O_I_WB_NO_WR_ALLOC,
  34         O_I_NON_CACHEABLE,
  35         O_I_WB_RD_WR_ALLOC,
  36         DEVICE_NON_SHARED,
  37 };
  38 enum size {
  39         REGION_8MB = 22,
  40         REGION_16MB,
  41         REGION_32MB,
  42         REGION_64MB,
  43         REGION_128MB,
  44         REGION_256MB,
  45         REGION_512MB,
  46         REGION_1GB,
  47         REGION_2GB,
  48         REGION_4GB,
  49 };
  50
  51 enum xn {
  52         XN_DIS = 0,
  53         XN_EN,
  54 };
  55
  56 struct mpu_region_config {
  57         uint32_t start_addr;
  58         enum region_number region_no;
  59         enum xn xn;
  60         enum ap ap;
  61         enum mr_attr mr_attr;
  62         enum size reg_size;
  63 };
  64
  65 void disable_mpu(void);
  66 void enable_mpu(void);
  67 void mpu_config(struct mpu_region_config *reg_config);