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217 lines
5.4 KiB
217 lines
5.4 KiB
// 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 <[email protected]> |
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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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