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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019-2022 Linaro Limited
*/
#define LOG_CATEGORY UCLASS_CLK
#include <clk-uclass.h>
#include <dm.h>
#include <scmi_agent.h>
#include <scmi_protocols.h>
#include <asm/types.h>
#include <linux/clk-provider.h>
static int scmi_clk_get_num_clock(struct udevice *dev, size_t *num_clocks)
{
struct scmi_clk_protocol_attr_out out;
struct scmi_msg msg = {
.protocol_id = SCMI_PROTOCOL_ID_CLOCK,
.message_id = SCMI_PROTOCOL_ATTRIBUTES,
.out_msg = (u8 *)&out,
.out_msg_sz = sizeof(out),
};
int ret;
ret = devm_scmi_process_msg(dev, &msg);
if (ret)
return ret;
*num_clocks = out.attributes & SCMI_CLK_PROTO_ATTR_COUNT_MASK;
return 0;
}
static int scmi_clk_get_attibute(struct udevice *dev, int clkid, char **name)
{
struct scmi_clk_attribute_in in = {
.clock_id = clkid,
};
struct scmi_clk_attribute_out out;
struct scmi_msg msg = {
.protocol_id = SCMI_PROTOCOL_ID_CLOCK,
.message_id = SCMI_CLOCK_ATTRIBUTES,
.in_msg = (u8 *)&in,
.in_msg_sz = sizeof(in),
.out_msg = (u8 *)&out,
.out_msg_sz = sizeof(out),
};
int ret;
ret = devm_scmi_process_msg(dev, &msg);
if (ret)
return ret;
*name = strdup(out.clock_name);
return 0;
}
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, &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, &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, &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 int scmi_clk_probe(struct udevice *dev)
{
struct clk *clk;
size_t num_clocks, i;
int ret;
ret = devm_scmi_of_get_channel(dev);
if (ret)
return ret;
if (!CONFIG_IS_ENABLED(CLK_CCF))
return 0;
/* register CCF children: CLK UCLASS, no probed again */
if (device_get_uclass_id(dev->parent) == UCLASS_CLK)
return 0;
ret = scmi_clk_get_num_clock(dev, &num_clocks);
if (ret)
return ret;
for (i = 0; i < num_clocks; i++) {
char *clock_name;
if (!scmi_clk_get_attibute(dev, i, &clock_name)) {
clk = kzalloc(sizeof(*clk), GFP_KERNEL);
if (!clk || !clock_name)
ret = -ENOMEM;
else
ret = clk_register(clk, dev->driver->name,
clock_name, dev->name);
if (ret) {
free(clk);
free(clock_name);
return ret;
}
clk_dm(i, clk);
}
}
return 0;
}
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,
.probe = scmi_clk_probe,
};
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