invoke_smc() allow U-Boot proper running in non-secure mode (EL2) to invoke SMC call to ATF's PSCI runtime services such as System Manager's registers access, 2nd phase bitstream FPGA reconfiguration, Remote System Update (RSU) and etc.
smc_send_mailbox() is a send mailbox command helper function which invokes the ATF's PSCI runtime service (function ID: INTEL_SIP_SMC_MBOX_SEND_CMD) to send mailbox messages to Secure Device Manager (SDM).
Signed-off-by: Chee Hong Ang chee.hong.ang@intel.com --- arch/arm/mach-socfpga/Makefile | 2 + arch/arm/mach-socfpga/include/mach/smc_api.h | 13 +++++ arch/arm/mach-socfpga/smc_api.c | 56 ++++++++++++++++++++ 3 files changed, 71 insertions(+) create mode 100644 arch/arm/mach-socfpga/include/mach/smc_api.h create mode 100644 arch/arm/mach-socfpga/smc_api.c
diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-socfpga/Makefile index c63162a5c6..0b05283a7a 100644 --- a/arch/arm/mach-socfpga/Makefile +++ b/arch/arm/mach-socfpga/Makefile @@ -72,6 +72,8 @@ ifdef CONFIG_TARGET_SOCFPGA_AGILEX obj-y += firewall.o obj-y += spl_agilex.o endif +else +obj-$(CONFIG_SPL_ATF) += smc_api.o endif
ifdef CONFIG_TARGET_SOCFPGA_GEN5 diff --git a/arch/arm/mach-socfpga/include/mach/smc_api.h b/arch/arm/mach-socfpga/include/mach/smc_api.h new file mode 100644 index 0000000000..bbefdd8dd9 --- /dev/null +++ b/arch/arm/mach-socfpga/include/mach/smc_api.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2020 Intel Corporation + */ + +#ifndef _SMC_API_H_ +#define _SMC_API_H_ + +int invoke_smc(u32 func_id, u64 *args, int arg_len, u64 *ret_arg, int ret_len); +int smc_send_mailbox(u32 cmd, u32 len, u32 *arg, u8 urgent, u32 *resp_buf_len, + u32 *resp_buf); + +#endif /* _SMC_API_H_ */ diff --git a/arch/arm/mach-socfpga/smc_api.c b/arch/arm/mach-socfpga/smc_api.c new file mode 100644 index 0000000000..085daba162 --- /dev/null +++ b/arch/arm/mach-socfpga/smc_api.c @@ -0,0 +1,56 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2020 Intel Corporation <www.intel.com> + * + */ + +#include <common.h> +#include <asm/ptrace.h> +#include <asm/system.h> +#include <linux/intel-smc.h> + +int invoke_smc(u32 func_id, u64 *args, int arg_len, u64 *ret_arg, int ret_len) +{ + struct pt_regs regs; + + memset(®s, 0, sizeof(regs)); + regs.regs[0] = func_id; + + if (args) + memcpy(®s.regs[1], args, arg_len * sizeof(*args)); + + smc_call(®s); + + if (ret_arg) + memcpy(ret_arg, ®s.regs[1], ret_len * sizeof(*ret_arg)); + + return regs.regs[0]; +} + +int smc_send_mailbox(u32 cmd, u32 len, u32 *arg, u8 urgent, u32 *resp_buf_len, + u32 *resp_buf) +{ + int ret; + u64 args[6]; + u64 resp[3]; + + args[0] = cmd; + args[1] = (u64)arg; + args[2] = len; + args[3] = urgent; + args[4] = (u64)resp_buf; + if (resp_buf_len) + args[5] = *resp_buf_len; + else + args[5] = 0; + + ret = invoke_smc(INTEL_SIP_SMC_MBOX_SEND_CMD, args, ARRAY_SIZE(args), + resp, ARRAY_SIZE(resp)); + + if (ret == INTEL_SIP_SMC_STATUS_OK && resp_buf && resp_buf_len) { + if (!resp[0]) + *resp_buf_len = resp[1]; + } + + return (int)resp[0]; +}