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 #define STM32_SMC_WRLOCK_OTP            0x07
  31
  32 /* SMC error codes */
  33 #define STM32_SMC_OK                    0x0
  34 #define STM32_SMC_NOT_SUPPORTED         -1
  35 #define STM32_SMC_FAILED                -2
  36 #define STM32_SMC_INVALID_PARAMS        -3
  37
  38 #define stm32_smc_exec(svc, op, data1, data2) \
  39         stm32_smc(svc, op, data1, data2, NULL)
  40
  41 #ifdef CONFIG_ARM_SMCCC
  42 static inline u32 stm32_smc(u32 svc, u8 op, u32 data1, u32 data2, u32 *result)
  43 {
  44         struct arm_smccc_res res;
  45
  46         arm_smccc_smc(svc, op, data1, data2, 0, 0, 0, 0, &res);
  47
  48         if (res.a0) {
  49                 pr_err("%s: Failed to exec svc=%x op=%x in secure mode (err = %ld)\n",
  50                        __func__, svc, op, res.a0);
  51                 return -EINVAL;
  52         }
  53         if (result)
  54                 *result = (u32)res.a1;
  55
  56         return 0;
  57 }
  58 #else
  59 static inline u32 stm32_smc(u32 svc, u8 op, u32 data1, u32 data2, u32 *result)
  60 {
  61         return 0;
  62 }
  63 #endif
  64
  65 #endif /* __STM32MP1_SMC_H__ */