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firmware: arm_ffa: Add support for SMCCC as transport to FFA driver 

There are requests to keep the transport separate in order to allow
other possible transports like virtio. So let us keep the SMCCC transport
specific routines abstracted.

It is kept simple for now. Once we add another transport, we can develop
better abstraction.

Link: https://lore.kernel.org/r/20210521151033.181846-4-sudeep.holla@arm.com
Tested-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2021-05-21 16:10:31 +01:00
parent 3bbfe98710
commit 714be77e97
4 changed files with 50 additions and 1 deletions
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5
drivers/firmware/arm_ffa/Kconfig
View File

@ -14,3 +14,8 @@ config ARM_FFA_TRANSPORT
This driver provides interface for all the client drivers making
use of the features offered by ARM FF-A.
config ARM_FFA_SMCCC
bool
default ARM_FFA_TRANSPORT
depends on ARM64 && HAVE_ARM_SMCCC_DISCOVERY

3
drivers/firmware/arm_ffa/Makefile
View File

@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
ffa-bus-y = bus.o
ffa-driver-y = driver.o
ffa-module-objs := $(ffa-bus-y) $(ffa-driver-y)
ffa-transport-$(CONFIG_ARM_FFA_SMCCC) += smccc.o
ffa-module-objs := $(ffa-bus-y) $(ffa-driver-y) $(ffa-transport-y)
obj-$(CONFIG_ARM_FFA_TRANSPORT) = ffa-module.o

4
drivers/firmware/arm_ffa/common.h
View File

@ -16,9 +16,13 @@ typedef void (ffa_fn)(ffa_value_t, ffa_value_t *);
int arm_ffa_bus_init(void);
void arm_ffa_bus_exit(void);
#ifdef CONFIG_ARM_FFA_SMCCC
int __init ffa_transport_init(ffa_fn **invoke_ffa_fn);
#else
static inline int __init ffa_transport_init(ffa_fn **invoke_ffa_fn)
{
return -EOPNOTSUPP;
}
#endif
#endif /* _FFA_COMMON_H */

39
drivers/firmware/arm_ffa/smccc.c Normal file
View File

@ -0,0 +1,39 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021 ARM Ltd.
*/
#include <linux/printk.h>
#include "common.h"
static void __arm_ffa_fn_smc(ffa_value_t args, ffa_value_t *res)
{
arm_smccc_1_2_smc(&args, res);
}
static void __arm_ffa_fn_hvc(ffa_value_t args, ffa_value_t *res)
{
arm_smccc_1_2_hvc(&args, res);
}
int __init ffa_transport_init(ffa_fn **invoke_ffa_fn)
{
enum arm_smccc_conduit conduit;
if (arm_smccc_get_version() < ARM_SMCCC_VERSION_1_2)
return -EOPNOTSUPP;
conduit = arm_smccc_1_1_get_conduit();
if (conduit == SMCCC_CONDUIT_NONE) {
pr_err("%s: invalid SMCCC conduit\n", __func__);
return -EOPNOTSUPP;
}
if (conduit == SMCCC_CONDUIT_SMC)
*invoke_ffa_fn = __arm_ffa_fn_smc;
else
*invoke_ffa_fn = __arm_ffa_fn_hvc;
return 0;
}