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![Simon Glass](/assets/img/avatar_default.png)
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
226 lines
5.5 KiB
C
226 lines
5.5 KiB
C
// 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 <log.h>
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#include <malloc.h>
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#include <dm/device_compat.h>
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#include <linux/err.h>
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#include <linux/soc/ti/ti_sci_protocol.h>
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#include <k3-avs.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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#ifdef CONFIG_K3_AVS0
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k3_avs_notify_freq(clk->id, clk->data, rate);
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#endif
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ret = cops->set_freq(sci, clk->id, clk->data, 0, rate, ULONG_MAX);
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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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.rfree = 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 = sizeof(struct ti_sci_clk_data),
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.ops = &ti_sci_clk_ops,
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};
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