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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+
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/*
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* Copyright (C) 2019-2020 Linaro Limited
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <reset-uclass.h>
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#include <scmi_agent.h>
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#include <scmi_protocols.h>
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#include <asm/types.h>
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static int scmi_reset_set_level(struct reset_ctl *rst, bool assert_not_deassert)
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{
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struct scmi_rd_reset_in in = {
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.domain_id = rst->id,
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.flags = assert_not_deassert ? SCMI_RD_RESET_FLAG_ASSERT : 0,
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.reset_state = 0,
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};
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struct scmi_rd_reset_out out;
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struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
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SCMI_RESET_DOMAIN_RESET,
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in, out);
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int ret;
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ret = devm_scmi_process_msg(rst->dev->parent, &msg);
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if (ret)
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return ret;
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return scmi_to_linux_errno(out.status);
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}
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static int scmi_reset_assert(struct reset_ctl *rst)
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{
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return scmi_reset_set_level(rst, true);
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}
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static int scmi_reset_deassert(struct reset_ctl *rst)
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{
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return scmi_reset_set_level(rst, false);
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}
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static int scmi_reset_request(struct reset_ctl *rst)
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{
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struct scmi_rd_attr_in in = {
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.domain_id = rst->id,
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};
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struct scmi_rd_attr_out out;
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struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
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SCMI_RESET_DOMAIN_ATTRIBUTES,
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in, out);
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int ret;
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/*
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* We don't really care about the attribute, just check
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* the reset domain exists.
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*/
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ret = devm_scmi_process_msg(rst->dev->parent, &msg);
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if (ret)
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return ret;
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return scmi_to_linux_errno(out.status);
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}
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static int scmi_reset_rfree(struct reset_ctl *rst)
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{
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return 0;
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}
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static const struct reset_ops scmi_reset_domain_ops = {
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.request = scmi_reset_request,
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.rfree = scmi_reset_rfree,
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.rst_assert = scmi_reset_assert,
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.rst_deassert = scmi_reset_deassert,
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};
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U_BOOT_DRIVER(scmi_reset_domain) = {
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.name = "scmi_reset_domain",
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.id = UCLASS_RESET,
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.ops = &scmi_reset_domain_ops,
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};
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