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arm: socfpga: soc64: Add SMC helper function for Intel SOCFPGA (64bits) 

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>
This commit is contained in:
Chee Hong Ang 2020-12-24 18:21:00 +08:00 committed by Ley Foon Tan
parent dbdc1df877
commit 0eebfab3fe
3 changed files with 71 additions and 0 deletions
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2
arch/arm/mach-socfpga/Makefile
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@ -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

13
arch/arm/mach-socfpga/include/mach/smc_api.h Normal file
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@ -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_ */

56
arch/arm/mach-socfpga/smc_api.c Normal file
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@ -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(&regs, 0, sizeof(regs));
regs.regs[0] = func_id;
if (args)
memcpy(&regs.regs[1], args, arg_len * sizeof(*args));
smc_call(&regs);
if (ret_arg)
memcpy(ret_arg, &regs.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];
}