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/*
* Copyright (C) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
* Copyright (c) 2016, NVIDIA CORPORATION.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <clk.h>
#include <clk-uclass.h>
#include <dm.h>
#include <dt-structs.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
static inline struct clk_ops *clk_dev_ops(struct udevice *dev)
{
return (struct clk_ops *)dev->driver->ops;
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
# if CONFIG_IS_ENABLED(OF_PLATDATA)
int clk_get_by_index_platdata(struct udevice *dev, int index,
struct phandle_2_cell *cells, struct clk *clk)
{
int ret;
if (index != 0)
return -ENOSYS;
ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
if (ret)
return ret;
clk->id = cells[0].id;
return 0;
}
# else
static int clk_of_xlate_default(struct clk *clk,
struct ofnode_phandle_args *args)
{
debug("%s(clk=%p)\n", __func__, clk);
if (args->args_count > 1) {
debug("Invaild args_count: %d\n", args->args_count);
return -EINVAL;
}
if (args->args_count)
clk->id = args->args[0];
else
clk->id = 0;
return 0;
}
int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
{
int ret;
struct ofnode_phandle_args args;
struct udevice *dev_clk;
struct clk_ops *ops;
debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
assert(clk);
clk->dev = NULL;
ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0,
index, &args);
if (ret) {
debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
__func__, ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
if (ret) {
debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
__func__, ret);
return ret;
}
clk->dev = dev_clk;
ops = clk_dev_ops(dev_clk);
if (ops->of_xlate)
ret = ops->of_xlate(clk, &args);
else
ret = clk_of_xlate_default(clk, &args);
if (ret) {
debug("of_xlate() failed: %d\n", ret);
return ret;
}
return clk_request(dev_clk, clk);
}
# endif /* OF_PLATDATA */
int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
{
int index;
debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
clk->dev = NULL;
index = dev_read_stringlist_search(dev, "clock-names", name);
if (index < 0) {
debug("fdt_stringlist_search() failed: %d\n", index);
return index;
}
return clk_get_by_index(dev, index, clk);
}
#endif /* OF_CONTROL */
int clk_request(struct udevice *dev, struct clk *clk)
{
struct clk_ops *ops = clk_dev_ops(dev);
debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
clk->dev = dev;
if (!ops->request)
return 0;
return ops->request(clk);
}
int clk_free(struct clk *clk)
{
struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
if (!ops->free)
return 0;
return ops->free(clk);
}
ulong clk_get_rate(struct clk *clk)
{
struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
if (!ops->get_rate)
return -ENOSYS;
return ops->get_rate(clk);
}
ulong clk_set_rate(struct clk *clk, ulong rate)
{
struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
if (!ops->set_rate)
return -ENOSYS;
return ops->set_rate(clk, rate);
}
int clk_enable(struct clk *clk)
{
struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
if (!ops->enable)
return -ENOSYS;
return ops->enable(clk);
}
int clk_disable(struct clk *clk)
{
struct clk_ops *ops = clk_dev_ops(clk->dev);
debug("%s(clk=%p)\n", __func__, clk);
if (!ops->disable)
return -ENOSYS;
return ops->disable(clk);
}
int clk_release_all(struct clk *clk, int count)
{
int i, ret;
for (i = 0; i < count; i++) {
debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]);
/* check if clock has been previously requested */
if (!clk[i].dev)
continue;
ret = clk_disable(&clk[i]);
if (ret && ret != -ENOSYS)
return ret;
ret = clk_free(&clk[i]);
if (ret && ret != -ENOSYS)
return ret;
}
return 0;
}
UCLASS_DRIVER(clk) = {
.id = UCLASS_CLK,
.name = "clk",
};
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