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// SPDX-License-Identifier: GPL-2.0+
/*
* Texas Instruments System Control Interface (TI SCI) clock driver
*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
* Andreas Dannenberg <dannenberg@ti.com>
*
* Loosely based on Linux kernel sci-clk.c...
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <clk-uclass.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <k3-avs.h>
/**
* struct ti_sci_clk_data - clock controller information structure
* @sci: TI SCI handle used for communication with system controller
*/
struct ti_sci_clk_data {
const struct ti_sci_handle *sci;
};
static int ti_sci_clk_probe(struct udevice *dev)
{
struct ti_sci_clk_data *data = dev_get_priv(dev);
debug("%s(dev=%p)\n", __func__, dev);
if (!data)
return -ENOMEM;
/* Store handle for communication with the system controller */
data->sci = ti_sci_get_handle(dev);
if (IS_ERR(data->sci))
return PTR_ERR(data->sci);
return 0;
}
static int ti_sci_clk_of_xlate(struct clk *clk,
struct ofnode_phandle_args *args)
{
debug("%s(clk=%p, args_count=%d)\n", __func__, clk, args->args_count);
if (args->args_count != 2) {
debug("Invalid args_count: %d\n", args->args_count);
return -EINVAL;
}
/*
* On TI SCI-based devices, the clock provider id field is used as a
* device ID, and the data field is used as the associated sub-ID.
*/
clk->id = args->args[0];
clk->data = args->args[1];
return 0;
}
static int ti_sci_clk_request(struct clk *clk)
{
debug("%s(clk=%p)\n", __func__, clk);
return 0;
}
static int ti_sci_clk_free(struct clk *clk)
{
debug("%s(clk=%p)\n", __func__, clk);
return 0;
}
static ulong ti_sci_clk_get_rate(struct clk *clk)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
u64 current_freq;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
ret = cops->get_freq(sci, clk->id, clk->data, ¤t_freq);
if (ret) {
dev_err(clk->dev, "%s: get_freq failed (%d)\n", __func__, ret);
return ret;
}
debug("%s(current_freq=%llu)\n", __func__, current_freq);
return current_freq;
}
static ulong ti_sci_clk_set_rate(struct clk *clk, ulong rate)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
int ret;
debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
#ifdef CONFIG_K3_AVS0
k3_avs_notify_freq(clk->id, clk->data, rate);
#endif
/* Ask for exact frequency by using same value for min/target/max */
ret = cops->set_freq(sci, clk->id, clk->data, rate, rate, rate);
if (ret)
dev_err(clk->dev, "%s: set_freq failed (%d)\n", __func__, ret);
return ret;
}
static int ti_sci_clk_set_parent(struct clk *clk, struct clk *parent)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
u8 num_parents;
u8 parent_cid;
int ret;
debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
/* Make sure the clock parent is valid for a given device ID */
if (clk->id != parent->id)
return -EINVAL;
/* Make sure clock has parents that can be set */
ret = cops->get_num_parents(sci, clk->id, clk->data, &num_parents);
if (ret) {
dev_err(clk->dev, "%s: get_num_parents failed (%d)\n",
__func__, ret);
return ret;
}
if (num_parents < 2) {
dev_err(clk->dev, "%s: clock has no settable parents!\n",
__func__);
return -EINVAL;
}
/* Make sure parent clock ID is valid */
parent_cid = parent->data - clk->data - 1;
if (parent_cid >= num_parents) {
dev_err(clk->dev, "%s: invalid parent clock!\n", __func__);
return -EINVAL;
}
/* Ready to proceed to configure the new clock parent */
ret = cops->set_parent(sci, clk->id, clk->data, parent->data);
if (ret)
dev_err(clk->dev, "%s: set_parent failed (%d)\n", __func__,
ret);
return ret;
}
static int ti_sci_clk_enable(struct clk *clk)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
/*
* Allow the System Controller to automatically manage the state of
* this clock. If the device is enabled, then the clock is enabled.
*/
ret = cops->put_clock(sci, clk->id, clk->data);
if (ret)
dev_err(clk->dev, "%s: put_clock failed (%d)\n", __func__, ret);
return ret;
}
static int ti_sci_clk_disable(struct clk *clk)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
/* Unconditionally disable clock, regardless of state of the device */
ret = cops->idle_clock(sci, clk->id, clk->data);
if (ret)
dev_err(clk->dev, "%s: idle_clock failed (%d)\n", __func__,
ret);
return ret;
}
static const struct udevice_id ti_sci_clk_of_match[] = {
{ .compatible = "ti,k2g-sci-clk" },
{ /* sentinel */ },
};
static struct clk_ops ti_sci_clk_ops = {
.of_xlate = ti_sci_clk_of_xlate,
.request = ti_sci_clk_request,
.free = ti_sci_clk_free,
.get_rate = ti_sci_clk_get_rate,
.set_rate = ti_sci_clk_set_rate,
.set_parent = ti_sci_clk_set_parent,
.enable = ti_sci_clk_enable,
.disable = ti_sci_clk_disable,
};
U_BOOT_DRIVER(ti_sci_clk) = {
.name = "ti-sci-clk",
.id = UCLASS_CLK,
.of_match = ti_sci_clk_of_match,
.probe = ti_sci_clk_probe,
.priv_auto_alloc_size = sizeof(struct ti_sci_clk_data),
.ops = &ti_sci_clk_ops,
};
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