arch/arm/mach-stm32/soc.c

   1 /*
   2  * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
   3  * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <asm/armv7m_mpu.h>
  11
  12 int arch_cpu_init(void)
  13 {
  14         int i;
  15
  16         struct mpu_region_config stm32_region_config[] = {
  17                 /*
  18                  * Make all 4GB cacheable & executable. We are overriding it
  19                  * with next region for any requirement. e.g. below region1,
  20                  * 2 etc.
  21                  * In other words, the area not coming in following
  22                  * regions configuration is the one configured here in region_0
  23                  * (cacheable & executable).
  24                  */
  25                 { 0x00000000, REGION_0, XN_DIS, PRIV_RW_USR_RW,
  26                 O_I_WB_RD_WR_ALLOC, REGION_4GB },
  27
  28                 /* armv7m code area */
  29                 { 0x00000000, REGION_1, XN_DIS, PRIV_RW_USR_RW,
  30                 STRONG_ORDER, REGION_512MB },
  31
  32                 /* Device area : Not executable */
  33                 { 0x40000000, REGION_2, XN_EN, PRIV_RW_USR_RW,
  34                 DEVICE_NON_SHARED, REGION_512MB },
  35
  36                 /*
  37                  * Armv7m fixed configuration: strongly ordered & not
  38                  * executable, not cacheable
  39                  */
  40                 { 0xE0000000, REGION_3, XN_EN, PRIV_RW_USR_RW,
  41                 STRONG_ORDER, REGION_512MB },
  42
  43 #if !defined(CONFIG_STM32H7)
  44                 /* Device area : Not executable */
  45                 { 0xA0000000, REGION_4, XN_EN, PRIV_RW_USR_RW,
  46                 DEVICE_NON_SHARED, REGION_512MB },
  47 #endif
  48         };
  49
  50         disable_mpu();
  51         for (i = 0; i < ARRAY_SIZE(stm32_region_config); i++)
  52                 mpu_config(&stm32_region_config[i]);
  53         enable_mpu();
  54
  55         return 0;
  56 }