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This change introduces a clock driver for SCMI agent devices. When SCMI agent and SCMI clock drivers are enabled, SCMI agent binds a clock device for each SCMI clock protocol devices enabled in the FDT. SCMI clock driver is embedded upon CONFIG_CLK_SCMI=y. If enabled, CONFIG_SCMI_AGENT is also enabled. SCMI Clock 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: Lukasz Majewski <lukma@denx.de> 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>
100 lines
2.1 KiB
C
100 lines
2.1 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 <clk-uclass.h>
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#include <dm.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_clk_gate(struct clk *clk, int enable)
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{
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struct scmi_clk_state_in in = {
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.clock_id = clk->id,
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.attributes = enable,
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};
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struct scmi_clk_state_out out;
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struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_CLOCK,
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SCMI_CLOCK_CONFIG_SET,
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in, out);
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int ret;
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ret = devm_scmi_process_msg(clk->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_clk_enable(struct clk *clk)
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{
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return scmi_clk_gate(clk, 1);
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}
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static int scmi_clk_disable(struct clk *clk)
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{
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return scmi_clk_gate(clk, 0);
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}
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static ulong scmi_clk_get_rate(struct clk *clk)
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{
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struct scmi_clk_rate_get_in in = {
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.clock_id = clk->id,
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};
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struct scmi_clk_rate_get_out out;
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struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_CLOCK,
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SCMI_CLOCK_RATE_GET,
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in, out);
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int ret;
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ret = devm_scmi_process_msg(clk->dev->parent, &msg);
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if (ret < 0)
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return ret;
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ret = scmi_to_linux_errno(out.status);
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if (ret < 0)
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return ret;
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return (ulong)(((u64)out.rate_msb << 32) | out.rate_lsb);
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}
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static ulong scmi_clk_set_rate(struct clk *clk, ulong rate)
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{
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struct scmi_clk_rate_set_in in = {
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.clock_id = clk->id,
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.flags = SCMI_CLK_RATE_ROUND_CLOSEST,
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.rate_lsb = (u32)rate,
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.rate_msb = (u32)((u64)rate >> 32),
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};
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struct scmi_clk_rate_set_out out;
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struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_CLOCK,
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SCMI_CLOCK_RATE_SET,
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in, out);
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int ret;
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ret = devm_scmi_process_msg(clk->dev->parent, &msg);
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if (ret < 0)
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return ret;
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ret = scmi_to_linux_errno(out.status);
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if (ret < 0)
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return ret;
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return scmi_clk_get_rate(clk);
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}
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static const struct clk_ops scmi_clk_ops = {
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.enable = scmi_clk_enable,
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.disable = scmi_clk_disable,
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.get_rate = scmi_clk_get_rate,
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.set_rate = scmi_clk_set_rate,
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};
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U_BOOT_DRIVER(scmi_clock) = {
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.name = "scmi_clk",
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.id = UCLASS_CLK,
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.ops = &scmi_clk_ops,
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};
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