arch/arm/include/asm/armv7m_mpu.h

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