arch/arm/mach-stm32mp/include/mach/stm32mp1_smc.h

   1 /* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
   2 /*
   3  * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
   4  */
   5
   6 #ifndef __STM32MP1_SMC_H__
   7 #define __STM32MP1_SMC_H__
   8
   9 #include <linux/arm-smccc.h>
  10
  11 /*
  12  * SMC function IDs for STM32 Service queries
  13  * STM32 SMC services use the space between 0x82000000 and 0x8200FFFF
  14  * like this is defined in SMC calling Convention by ARM
  15  * for SiP (silicon Partner)
  16  * http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
  17  */
  18 #define STM32_SMC_VERSION               0x82000000
  19
  20 /* Secure Service access from Non-secure */
  21 #define STM32_SMC_BSEC                  0x82001003
  22
  23 /* Service for BSEC */
  24 #define STM32_SMC_READ_SHADOW           0x01
  25 #define STM32_SMC_PROG_OTP              0x02
  26 #define STM32_SMC_WRITE_SHADOW          0x03
  27 #define STM32_SMC_READ_OTP              0x04
  28 #define STM32_SMC_READ_ALL              0x05
  29 #define STM32_SMC_WRITE_ALL             0x06
  30
  31 /* SMC error codes */
  32 #define STM32_SMC_OK                    0x0
  33 #define STM32_SMC_NOT_SUPPORTED         -1
  34 #define STM32_SMC_FAILED                -2
  35 #define STM32_SMC_INVALID_PARAMS        -3
  36
  37 #define stm32_smc_exec(svc, op, data1, data2) \
  38         stm32_smc(svc, op, data1, data2, NULL)
  39
  40 #ifdef CONFIG_ARM_SMCCC
  41 static inline u32 stm32_smc(u32 svc, u8 op, u32 data1, u32 data2, u32 *result)
  42 {
  43         struct arm_smccc_res res;
  44
  45         arm_smccc_smc(svc, op, data1, data2, 0, 0, 0, 0, &res);
  46
  47         if (res.a0) {
  48                 pr_err("%s: Failed to exec in secure mode (err = %ld)\n",
  49                        __func__, res.a0);
  50                 return -EINVAL;
  51         }
  52         if (result)
  53                 *result = (u32)res.a1;
  54
  55         return 0;
  56 }
  57 #else
  58 static inline u32 stm32_smc(u32 svc, u8 op, u32 data1, u32 data2, u32 *result)
  59 {
  60         return 0;
  61 }
  62 #endif
  63
  64 #endif /* __STM32MP1_SMC_H__ */