[linux-block.git] / drivers / clk / sprd / common.c

// SPDX-License-Identifier: GPL-2.0
//
// Spreadtrum clock infrastructure
//
// Copyright (C) 2017 Spreadtrum, Inc.
// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>

#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>

#include "common.h"

static const struct regmap_config sprdclk_regmap_config = {
	.reg_bits	= 32,
	.reg_stride	= 4,
	.val_bits	= 32,
	.max_register	= 0xffff,
	.fast_io	= true,
};

static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
			 struct regmap *regmap)
{
	int i;
	struct sprd_clk_common *cclk;

	for (i = 0; i < desc->num_clk_clks; i++) {
		cclk = desc->clk_clks[i];
		if (!cclk)
			continue;

		cclk->regmap = regmap;
	}
}

int sprd_clk_regmap_init(struct platform_device *pdev,
			 const struct sprd_clk_desc *desc)
{
	void __iomem *base;
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;
	struct regmap *regmap;

	if (of_find_property(node, "sprd,syscon", NULL)) {
		regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
		if (IS_ERR(regmap)) {
			pr_err("%s: failed to get syscon regmap\n", __func__);
			return PTR_ERR(regmap);
		}
	} else if (of_device_is_compatible(of_get_parent(dev->of_node),
			   "syscon")) {
		regmap = device_node_to_regmap(of_get_parent(dev->of_node));
		if (IS_ERR(regmap)) {
			dev_err(dev, "failed to get regmap from its parent.\n");
			return PTR_ERR(regmap);
		}
	} else {
		base = devm_platform_ioremap_resource(pdev, 0);
		if (IS_ERR(base))
			return PTR_ERR(base);

		regmap = devm_regmap_init_mmio(&pdev->dev, base,
					       &sprdclk_regmap_config);
		if (IS_ERR(regmap)) {
			pr_err("failed to init regmap\n");
			return PTR_ERR(regmap);
		}
	}

	sprd_clk_set_regmap(desc, regmap);

	return 0;
}
EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);

int sprd_clk_probe(struct device *dev, struct clk_hw_onecell_data *clkhw)
{
	int i, ret;
	struct clk_hw *hw;

	for (i = 0; i < clkhw->num; i++) {
		const char *name;

		hw = clkhw->hws[i];
		if (!hw)
			continue;

		name = hw->init->name;
		ret = devm_clk_hw_register(dev, hw);
		if (ret) {
			dev_err(dev, "Couldn't register clock %d - %s\n",
				i, name);
			return ret;
		}
	}

	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
	if (ret)
		dev_err(dev, "Failed to add clock provider\n");

	return ret;
}
EXPORT_SYMBOL_GPL(sprd_clk_probe);

MODULE_LICENSE("GPL v2");
Commit	Line	Data
d41f59fd CZ	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// Spreadtrum clock infrastructure
	4	//
	5	// Copyright (C) 2017 Spreadtrum, Inc.
	6	// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
	7
	8	#include <linux/mfd/syscon.h>
	9	#include <linux/module.h>
	10	#include <linux/of_address.h>
	11	#include <linux/of_platform.h>
	12	#include <linux/regmap.h>
	13
	14	#include "common.h"
	15
	16	static const struct regmap_config sprdclk_regmap_config = {
	17	.reg_bits = 32,
	18	.reg_stride = 4,
	19	.val_bits = 32,
	20	.max_register = 0xffff,
	21	.fast_io = true,
	22	};
	23
	24	static void sprd_clk_set_regmap(const struct sprd_clk_desc *desc,
	25	struct regmap *regmap)
	26	{
	27	int i;
	28	struct sprd_clk_common *cclk;
	29
	30	for (i = 0; i < desc->num_clk_clks; i++) {
	31	cclk = desc->clk_clks[i];
	32	if (!cclk)
	33	continue;
	34
	35	cclk->regmap = regmap;
	36	}
	37	}
	38
	39	int sprd_clk_regmap_init(struct platform_device *pdev,
	40	const struct sprd_clk_desc *desc)
	41	{
	42	void __iomem *base;
f95e8c79 CZ	43	struct device *dev = &pdev->dev;
f95e8c79 CZ	44	struct device_node *node = dev->of_node;
d41f59fd CZ	45	struct regmap *regmap;
	46
	47	if (of_find_property(node, "sprd,syscon", NULL)) {
	48	regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
9629dbda	49	if (IS_ERR(regmap)) {
d41f59fd CZ	50	pr_err("%s: failed to get syscon regmap\n", __func__);
	51	return PTR_ERR(regmap);
	52	}
f95e8c79 CZ	53	} else if (of_device_is_compatible(of_get_parent(dev->of_node),
	54	"syscon")) {
	55	regmap = device_node_to_regmap(of_get_parent(dev->of_node));
	56	if (IS_ERR(regmap)) {
	57	dev_err(dev, "failed to get regmap from its parent.\n");
	58	return PTR_ERR(regmap);
	59	}
d41f59fd	60	} else {
793ee798	61	base = devm_platform_ioremap_resource(pdev, 0);
69b39d25 CZ	62	if (IS_ERR(base))
	63	return PTR_ERR(base);
	64
d41f59fd CZ	65	regmap = devm_regmap_init_mmio(&pdev->dev, base,
d41f59fd CZ	66	&sprdclk_regmap_config);
78f52969	67	if (IS_ERR(regmap)) {
d41f59fd CZ	68	pr_err("failed to init regmap\n");
	69	return PTR_ERR(regmap);
	70	}
	71	}
	72
	73	sprd_clk_set_regmap(desc, regmap);
	74
	75	return 0;
	76	}
	77	EXPORT_SYMBOL_GPL(sprd_clk_regmap_init);
	78
	79	int sprd_clk_probe(struct device dev, struct clk_hw_onecell_data clkhw)
	80	{
	81	int i, ret;
	82	struct clk_hw *hw;
	83
	84	for (i = 0; i < clkhw->num; i++) {
f6c90df8	85	const char *name;
d41f59fd CZ	86
d41f59fd CZ	87	hw = clkhw->hws[i];
d41f59fd CZ	88	if (!hw)
	89	continue;
	90
f6c90df8	91	name = hw->init->name;
d41f59fd CZ	92	ret = devm_clk_hw_register(dev, hw);
	93	if (ret) {
	94	dev_err(dev, "Couldn't register clock %d - %s\n",
f6c90df8	95	i, name);
d41f59fd CZ	96	return ret;
	97	}
	98	}
	99
	100	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clkhw);
	101	if (ret)
	102	dev_err(dev, "Failed to add clock provider\n");
	103
	104	return ret;
	105	}
	106	EXPORT_SYMBOL_GPL(sprd_clk_probe);
	107
	108	MODULE_LICENSE("GPL v2");