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https://github.com/AsahiLinux/u-boot
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38a905ecf9
Update SCMI clock driver to get its assigned SCMI channel during initialization. This change allows SCMI clock protocol to use a dedicated channel when defined in the DT. The reference is saved in SCMI clock driver private data. Cc: Lukasz Majewski <lukma@denx.de> Cc: Sean Anderson <seanga2@gmail.com> Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
209 lines
4.5 KiB
C
209 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019-2022 Linaro Limited
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*/
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#define LOG_CATEGORY UCLASS_CLK
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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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#include <linux/clk-provider.h>
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/**
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* struct scmi_clk_priv - Private data for SCMI clocks
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* @channel: Reference to the SCMI channel to use
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*/
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struct scmi_clk_priv {
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struct scmi_channel *channel;
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};
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static int scmi_clk_get_num_clock(struct udevice *dev, size_t *num_clocks)
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{
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struct scmi_clk_priv *priv = dev_get_priv(dev);
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struct scmi_clk_protocol_attr_out out;
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struct scmi_msg msg = {
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.protocol_id = SCMI_PROTOCOL_ID_CLOCK,
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.message_id = SCMI_PROTOCOL_ATTRIBUTES,
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.out_msg = (u8 *)&out,
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.out_msg_sz = sizeof(out),
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};
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int ret;
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ret = devm_scmi_process_msg(dev, priv->channel, &msg);
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if (ret)
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return ret;
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*num_clocks = out.attributes & SCMI_CLK_PROTO_ATTR_COUNT_MASK;
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return 0;
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}
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static int scmi_clk_get_attibute(struct udevice *dev, int clkid, char **name)
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{
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struct scmi_clk_priv *priv = dev_get_priv(dev);
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struct scmi_clk_attribute_in in = {
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.clock_id = clkid,
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};
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struct scmi_clk_attribute_out out;
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struct scmi_msg msg = {
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.protocol_id = SCMI_PROTOCOL_ID_CLOCK,
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.message_id = SCMI_CLOCK_ATTRIBUTES,
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.in_msg = (u8 *)&in,
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.in_msg_sz = sizeof(in),
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.out_msg = (u8 *)&out,
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.out_msg_sz = sizeof(out),
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};
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int ret;
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ret = devm_scmi_process_msg(dev, priv->channel, &msg);
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if (ret)
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return ret;
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*name = strdup(out.clock_name);
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return 0;
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}
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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_priv *priv = dev_get_priv(clk->dev);
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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, priv->channel, &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_priv *priv = dev_get_priv(clk->dev);
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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, priv->channel, &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_priv *priv = dev_get_priv(clk->dev);
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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, priv->channel, &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 int scmi_clk_probe(struct udevice *dev)
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{
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struct scmi_clk_priv *priv = dev_get_priv(dev);
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struct clk *clk;
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size_t num_clocks, i;
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int ret;
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ret = devm_scmi_of_get_channel(dev, &priv->channel);
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if (ret)
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return ret;
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if (!CONFIG_IS_ENABLED(CLK_CCF))
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return 0;
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/* register CCF children: CLK UCLASS, no probed again */
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if (device_get_uclass_id(dev->parent) == UCLASS_CLK)
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return 0;
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ret = scmi_clk_get_num_clock(dev, &num_clocks);
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if (ret)
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return ret;
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for (i = 0; i < num_clocks; i++) {
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char *clock_name;
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if (!scmi_clk_get_attibute(dev, i, &clock_name)) {
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clk = kzalloc(sizeof(*clk), GFP_KERNEL);
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if (!clk || !clock_name)
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ret = -ENOMEM;
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else
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ret = clk_register(clk, dev->driver->name,
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clock_name, dev->name);
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if (ret) {
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free(clk);
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free(clock_name);
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return ret;
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}
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clk_dm(i, clk);
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}
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}
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return 0;
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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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.probe = scmi_clk_probe,
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.priv_auto = sizeof(struct scmi_clk_priv *),
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};
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