mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-29 16:10:58 +00:00
34d76fefb2
This change introduces a reset controller driver for SCMI agent devices. When SCMI agent and SCMI reset domain drivers are enabled, SCMI agent binds a reset controller device for each SCMI reset domain protocol devices enabled in the FDT. SCMI reset driver is embedded upon CONFIG_RESET_SCMI=y. If enabled, CONFIG_SCMI_AGENT is also enabled. SCMI Reset Domain protocol is defined in the SCMI specification [1]. Links: [1] https://developer.arm.com/architectures/system-architectures/software-standards/scmi Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org> Cc: Simon Glass <sjg@chromium.org> Cc: Peng Fan <peng.fan@nxp.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Reviewed-by: Simon Glass <sjg@chromium.org>
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2019-2020 Linaro Limited
|
|
*/
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <reset-uclass.h>
|
|
#include <scmi_agent.h>
|
|
#include <scmi_protocols.h>
|
|
#include <asm/types.h>
|
|
|
|
static int scmi_reset_set_level(struct reset_ctl *rst, bool assert_not_deassert)
|
|
{
|
|
struct scmi_rd_reset_in in = {
|
|
.domain_id = rst->id,
|
|
.flags = assert_not_deassert ? SCMI_RD_RESET_FLAG_ASSERT : 0,
|
|
.reset_state = 0,
|
|
};
|
|
struct scmi_rd_reset_out out;
|
|
struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
|
|
SCMI_RESET_DOMAIN_RESET,
|
|
in, out);
|
|
int ret;
|
|
|
|
ret = devm_scmi_process_msg(rst->dev->parent, &msg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return scmi_to_linux_errno(out.status);
|
|
}
|
|
|
|
static int scmi_reset_assert(struct reset_ctl *rst)
|
|
{
|
|
return scmi_reset_set_level(rst, true);
|
|
}
|
|
|
|
static int scmi_reset_deassert(struct reset_ctl *rst)
|
|
{
|
|
return scmi_reset_set_level(rst, false);
|
|
}
|
|
|
|
static int scmi_reset_request(struct reset_ctl *rst)
|
|
{
|
|
struct scmi_rd_attr_in in = {
|
|
.domain_id = rst->id,
|
|
};
|
|
struct scmi_rd_attr_out out;
|
|
struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
|
|
SCMI_RESET_DOMAIN_ATTRIBUTES,
|
|
in, out);
|
|
int ret;
|
|
|
|
/*
|
|
* We don't really care about the attribute, just check
|
|
* the reset domain exists.
|
|
*/
|
|
ret = devm_scmi_process_msg(rst->dev->parent, &msg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return scmi_to_linux_errno(out.status);
|
|
}
|
|
|
|
static int scmi_reset_rfree(struct reset_ctl *rst)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct reset_ops scmi_reset_domain_ops = {
|
|
.request = scmi_reset_request,
|
|
.rfree = scmi_reset_rfree,
|
|
.rst_assert = scmi_reset_assert,
|
|
.rst_deassert = scmi_reset_deassert,
|
|
};
|
|
|
|
U_BOOT_DRIVER(scmi_reset_domain) = {
|
|
.name = "scmi_reset_domain",
|
|
.id = UCLASS_RESET,
|
|
.ops = &scmi_reset_domain_ops,
|
|
};
|