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