From c52cd07407af6467d68f1ed9dd180fb72bbf0313 Mon Sep 17 00:00:00 2001 From: Alexey Romanov Date: Thu, 21 Sep 2023 11:13:34 +0300 Subject: drivers: introduce Secure Monitor uclass At the moment, we don't have a common API for working with SM, only the smc_call() function. This approach is not generic and difficult to configure and maintain. This patch adds UCLASS_SM with the generic API: - sm_call() - sm_call_write() - sm_call_read() These functions operate with struct pt_regs, which describes Secure Monitor arguments. Signed-off-by: Alexey Romanov Reviewed-by: Simon Glass Link: https://lore.kernel.org/r/20230921081346.22157-2-avromanov@salutedevices.com Signed-off-by: Neil Armstrong --- drivers/sm/sm-uclass.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 drivers/sm/sm-uclass.c (limited to 'drivers/sm/sm-uclass.c') diff --git a/drivers/sm/sm-uclass.c b/drivers/sm/sm-uclass.c new file mode 100644 index 00000000000..6a8b7026293 --- /dev/null +++ b/drivers/sm/sm-uclass.c @@ -0,0 +1,55 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2023 SberDevices, Inc. + * + * Author: Alexey Romanov + */ + +#include +#include +#include +#include + +static const struct sm_ops *get_sm_ops(struct udevice *dev) +{ + return (const struct sm_ops *)dev->driver->ops; +} + +int sm_call(struct udevice *dev, u32 cmd, s32 *ret, struct pt_regs *args) +{ + const struct sm_ops *ops = get_sm_ops(dev); + + if (ops->sm_call) + return ops->sm_call(dev, cmd, ret, args); + + return -ENOSYS; +} + +int sm_call_read(struct udevice *dev, void *buffer, size_t size, + u32 cmd, struct pt_regs *args) +{ + const struct sm_ops *ops = get_sm_ops(dev); + + if (ops->sm_call_read) + return ops->sm_call_read(dev, buffer, size, cmd, + args); + + return -ENOSYS; +} + +int sm_call_write(struct udevice *dev, void *buffer, size_t size, + u32 cmd, struct pt_regs *args) +{ + const struct sm_ops *ops = get_sm_ops(dev); + + if (ops->sm_call_write) + return ops->sm_call_write(dev, buffer, size, cmd, + args); + + return -ENOSYS; +} + +UCLASS_DRIVER(sm) = { + .name = "sm", + .id = UCLASS_SM, +}; -- cgit v1.2.3