mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
6038884483
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+
|
|
/*
|
|
* Copyright (C) 2019-2020 Linaro Limited
|
|
*/
|
|
#include <common.h>
|
|
#include <clk-uclass.h>
|
|
#include <dm.h>
|
|
#include <scmi_agent.h>
|
|
#include <scmi_protocols.h>
|
|
#include <asm/types.h>
|
|
|
|
static int scmi_clk_gate(struct clk *clk, int enable)
|
|
{
|
|
struct scmi_clk_state_in in = {
|
|
.clock_id = clk->id,
|
|
.attributes = enable,
|
|
};
|
|
struct scmi_clk_state_out out;
|
|
struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_CLOCK,
|
|
SCMI_CLOCK_CONFIG_SET,
|
|
in, out);
|
|
int ret;
|
|
|
|
ret = devm_scmi_process_msg(clk->dev->parent, &msg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return scmi_to_linux_errno(out.status);
|
|
}
|
|
|
|
static int scmi_clk_enable(struct clk *clk)
|
|
{
|
|
return scmi_clk_gate(clk, 1);
|
|
}
|
|
|
|
static int scmi_clk_disable(struct clk *clk)
|
|
{
|
|
return scmi_clk_gate(clk, 0);
|
|
}
|
|
|
|
static ulong scmi_clk_get_rate(struct clk *clk)
|
|
{
|
|
struct scmi_clk_rate_get_in in = {
|
|
.clock_id = clk->id,
|
|
};
|
|
struct scmi_clk_rate_get_out out;
|
|
struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_CLOCK,
|
|
SCMI_CLOCK_RATE_GET,
|
|
in, out);
|
|
int ret;
|
|
|
|
ret = devm_scmi_process_msg(clk->dev->parent, &msg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = scmi_to_linux_errno(out.status);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return (ulong)(((u64)out.rate_msb << 32) | out.rate_lsb);
|
|
}
|
|
|
|
static ulong scmi_clk_set_rate(struct clk *clk, ulong rate)
|
|
{
|
|
struct scmi_clk_rate_set_in in = {
|
|
.clock_id = clk->id,
|
|
.flags = SCMI_CLK_RATE_ROUND_CLOSEST,
|
|
.rate_lsb = (u32)rate,
|
|
.rate_msb = (u32)((u64)rate >> 32),
|
|
};
|
|
struct scmi_clk_rate_set_out out;
|
|
struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_CLOCK,
|
|
SCMI_CLOCK_RATE_SET,
|
|
in, out);
|
|
int ret;
|
|
|
|
ret = devm_scmi_process_msg(clk->dev->parent, &msg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = scmi_to_linux_errno(out.status);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return scmi_clk_get_rate(clk);
|
|
}
|
|
|
|
static const struct clk_ops scmi_clk_ops = {
|
|
.enable = scmi_clk_enable,
|
|
.disable = scmi_clk_disable,
|
|
.get_rate = scmi_clk_get_rate,
|
|
.set_rate = scmi_clk_set_rate,
|
|
};
|
|
|
|
U_BOOT_DRIVER(scmi_clock) = {
|
|
.name = "scmi_clk",
|
|
.id = UCLASS_CLK,
|
|
.ops = &scmi_clk_ops,
|
|
};
|