drivers/clk/clk-uclass.c - platform/external/u-boot - Gitiles

 /*
  * Copyright (C) 2015 Google, Inc
  * Written by Simon Glass <sjg@chromium.org>
  * Copyright (c) 2016, NVIDIA CORPORATION.
  * Copyright (c) 2018, Theobroma Systems Design und Consulting GmbH
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <clk.h>
 #include <clk-uclass.h>
 #include <dm.h>
 #include <dm/read.h>
 #include <dt-structs.h>
 #include <errno.h>

 static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
 {
 	return (const 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_1_arg *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].arg[0];

 	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;
 }

 static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
 				   int index, struct clk *clk)
 {
 	int ret;
 	struct ofnode_phandle_args args;
 	struct udevice *dev_clk;
 	const 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, prop_name, "#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);
 }

 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
 {
 	return clk_get_by_indexed_prop(dev, "clocks", index, clk);
 }

 static int clk_set_default_parents(struct udevice *dev)
 {
 	struct clk clk, parent_clk;
 	int index;
 	int num_parents;
 	int ret;

 	num_parents = dev_count_phandle_with_args(dev, "assigned-clock-parents",
 						  "#clock-cells");
 	if (num_parents < 0) {
 		debug("%s: could not read assigned-clock-parents for %p\n",
 		      __func__, dev);
 		return 0;
 	}

 	for (index = 0; index < num_parents; index++) {
 		ret = clk_get_by_indexed_prop(dev, "assigned-clock-parents",
 					      index, &parent_clk);
 		if (ret) {
 			debug("%s: could not get parent clock %d for %s\n",
 			      __func__, index, dev_read_name(dev));
 			return ret;
 		}

 		ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
 					      index, &clk);
 		if (ret) {
 			debug("%s: could not get assigned clock %d for %s\n",
 			      __func__, index, dev_read_name(dev));
 			return ret;
 		}

 		ret = clk_set_parent(&clk, &parent_clk);

 		/*
 		 * Not all drivers may support clock-reparenting (as of now).
 		 * Ignore errors due to this.
 		 */
 		if (ret == -ENOSYS)
 			continue;

 		if (ret) {
 			debug("%s: failed to reparent clock %d for %s\n",
 			      __func__, index, dev_read_name(dev));
 			return ret;
 		}
 	}

 	return 0;
 }

 static int clk_set_default_rates(struct udevice *dev)
 {
 	struct clk clk;
 	int index;
 	int num_rates;
 	int size;
 	int ret = 0;
 	u32 *rates = NULL;

 	size = dev_read_size(dev, "assigned-clock-rates");
 	if (size < 0)
 		return 0;

 	num_rates = size / sizeof(u32);
 	rates = calloc(num_rates, sizeof(u32));
 	if (!rates)
 		return -ENOMEM;

 	ret = dev_read_u32_array(dev, "assigned-clock-rates", rates, num_rates);
 	if (ret)
 		goto fail;

 	for (index = 0; index < num_rates; index++) {
 		ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
 					      index, &clk);
 		if (ret) {
 			debug("%s: could not get assigned clock %d for %s\n",
 			      __func__, index, dev_read_name(dev));
 			continue;
 		}

 		ret = clk_set_rate(&clk, rates[index]);
 		if (ret < 0) {
 			debug("%s: failed to set rate on clock %d for %s\n",
 			      __func__, index, dev_read_name(dev));
 			break;
 		}
 	}

 fail:
 	free(rates);
 	return ret;
 }

 int clk_set_defaults(struct udevice *dev)
 {
 	int ret;

 	/* If this is running pre-reloc state, don't take any action. */
 	if (!(gd->flags & GD_FLG_RELOC))
 		return 0;

 	debug("%s(%s)\n", __func__, dev_read_name(dev));

 	ret = clk_set_default_parents(dev);
 	if (ret)
 		return ret;

 	ret = clk_set_default_rates(dev);
 	if (ret < 0)
 		return ret;

 	return 0;
 }
 # 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);
 }

 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;
 }

 #endif /* OF_CONTROL */

 int clk_request(struct udevice *dev, struct clk *clk)
 {
 	const 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)
 {
 	const 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)
 {
 	const 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)
 {
 	const 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_set_parent(struct clk *clk, struct clk *parent)
 {
 	const struct clk_ops *ops = clk_dev_ops(clk->dev);

 	debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);

 	if (!ops->set_parent)
 		return -ENOSYS;

 	return ops->set_parent(clk, parent);
 }

 int clk_enable(struct clk *clk)
 {
 	const 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)
 {
 	const 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);
 }

 UCLASS_DRIVER(clk) = {
 	.id		= UCLASS_CLK,
 	.name		= "clk",
 };
	/*
	* Copyright (C) 2015 Google, Inc
	* Written by Simon Glass <sjg@chromium.org>
	* Copyright (c) 2016, NVIDIA CORPORATION.
	* Copyright (c) 2018, Theobroma Systems Design und Consulting GmbH
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <clk.h>
	#include <clk-uclass.h>
	#include <dm.h>
	#include <dm/read.h>
	#include <dt-structs.h>
	#include <errno.h>

	static inline const struct clk_ops clk_dev_ops(struct udevice dev)
	{
	return (const 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_1_arg 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].arg[0];

	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;
	}

	static int clk_get_by_indexed_prop(struct udevice dev, const char prop_name,
	int index, struct clk *clk)
	{
	int ret;
	struct ofnode_phandle_args args;
	struct udevice *dev_clk;
	const 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, prop_name, "#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);
	}

	int clk_get_by_index(struct udevice dev, int index, struct clk clk)
	{
	return clk_get_by_indexed_prop(dev, "clocks", index, clk);
	}

	static int clk_set_default_parents(struct udevice *dev)
	{
	struct clk clk, parent_clk;
	int index;
	int num_parents;
	int ret;

	num_parents = dev_count_phandle_with_args(dev, "assigned-clock-parents",
	"#clock-cells");
	if (num_parents < 0) {
	debug("%s: could not read assigned-clock-parents for %p\n",
	__func__, dev);
	return 0;
	}

	for (index = 0; index < num_parents; index++) {
	ret = clk_get_by_indexed_prop(dev, "assigned-clock-parents",
	index, &parent_clk);
	if (ret) {
	debug("%s: could not get parent clock %d for %s\n",
	__func__, index, dev_read_name(dev));
	return ret;
	}

	ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
	index, &clk);
	if (ret) {
	debug("%s: could not get assigned clock %d for %s\n",
	__func__, index, dev_read_name(dev));
	return ret;
	}

	ret = clk_set_parent(&clk, &parent_clk);

	/*
	* Not all drivers may support clock-reparenting (as of now).
	* Ignore errors due to this.
	*/
	if (ret == -ENOSYS)
	continue;

	if (ret) {
	debug("%s: failed to reparent clock %d for %s\n",
	__func__, index, dev_read_name(dev));
	return ret;
	}
	}

	return 0;
	}

	static int clk_set_default_rates(struct udevice *dev)
	{
	struct clk clk;
	int index;
	int num_rates;
	int size;
	int ret = 0;
	u32 *rates = NULL;

	size = dev_read_size(dev, "assigned-clock-rates");
	if (size < 0)
	return 0;

	num_rates = size / sizeof(u32);
	rates = calloc(num_rates, sizeof(u32));
	if (!rates)
	return -ENOMEM;

	ret = dev_read_u32_array(dev, "assigned-clock-rates", rates, num_rates);
	if (ret)
	goto fail;

	for (index = 0; index < num_rates; index++) {
	ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
	index, &clk);
	if (ret) {
	debug("%s: could not get assigned clock %d for %s\n",
	__func__, index, dev_read_name(dev));
	continue;
	}

	ret = clk_set_rate(&clk, rates[index]);
	if (ret < 0) {
	debug("%s: failed to set rate on clock %d for %s\n",
	__func__, index, dev_read_name(dev));
	break;
	}
	}

	fail:
	free(rates);
	return ret;
	}

	int clk_set_defaults(struct udevice *dev)
	{
	int ret;

	/* If this is running pre-reloc state, don't take any action. */
	if (!(gd->flags & GD_FLG_RELOC))
	return 0;

	debug("%s(%s)\n", __func__, dev_read_name(dev));

	ret = clk_set_default_parents(dev);
	if (ret)
	return ret;

	ret = clk_set_default_rates(dev);
	if (ret < 0)
	return ret;

	return 0;
	}
	# 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);
	}

	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;
	}

	#endif /* OF_CONTROL */

	int clk_request(struct udevice dev, struct clk clk)
	{
	const 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)
	{
	const 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)
	{
	const 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)
	{
	const 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_set_parent(struct clk clk, struct clk parent)
	{
	const struct clk_ops *ops = clk_dev_ops(clk->dev);

	debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);

	if (!ops->set_parent)
	return -ENOSYS;

	return ops->set_parent(clk, parent);
	}

	int clk_enable(struct clk *clk)
	{
	const 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)
	{
	const 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);
	}

	UCLASS_DRIVER(clk) = {
	.id = UCLASS_CLK,
	.name = "clk",
	};