1// SPDX-License-Identifier: GPL-2.0+
 2//
 3// OWL common clock driver
 4//
 5// Copyright (c) 2014 Actions Semi Inc.
 6// Author: David Liu <liuwei@actions-semi.com>
 7//
 8// Copyright (c) 2018 Linaro Ltd.
 9// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
10
11#include <linux/of_address.h>
12#include <linux/of_platform.h>
13#include <linux/platform_device.h>
14#include <linux/regmap.h>
15
16#include "owl-common.h"
17
18static const struct regmap_config owl_regmap_config = {
19	.reg_bits	= 32,
20	.reg_stride	= 4,
21	.val_bits	= 32,
22	.max_register	= 0x00cc,
23	.fast_io	= true,
24};
25
26static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
27			 struct regmap *regmap)
28{
29	int i;
30	struct owl_clk_common *clks;
31
32	for (i = 0; i < desc->num_clks; i++) {
33		clks = desc->clks[i];
34		if (!clks)
35			continue;
36
37		clks->regmap = regmap;
38	}
39}
40
41int owl_clk_regmap_init(struct platform_device *pdev,
42			struct owl_clk_desc *desc)
43{
44	void __iomem *base;
45	struct regmap *regmap;
46	struct resource *res;
47
48	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
49	base = devm_ioremap_resource(&pdev->dev, res);
50	if (IS_ERR(base))
51		return PTR_ERR(base);
52
53	regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
54	if (IS_ERR(regmap)) {
55		pr_err("failed to init regmap\n");
56		return PTR_ERR(regmap);
57	}
58
59	owl_clk_set_regmap(desc, regmap);
60	desc->regmap = regmap;
61
62	return 0;
63}
64
65int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
66{
67	int i, ret;
68	struct clk_hw *hw;
69
70	for (i = 0; i < hw_clks->num; i++) {
71		const char *name;
72
73		hw = hw_clks->hws[i];
74		if (IS_ERR_OR_NULL(hw))
75			continue;
76
77		name = hw->init->name;
78		ret = devm_clk_hw_register(dev, hw);
79		if (ret) {
80			dev_err(dev, "Couldn't register clock %d - %s\n",
81				i, name);
82			return ret;
83		}
84	}
85
86	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
87	if (ret)
88		dev_err(dev, "Failed to add clock provider\n");
89
90	return ret;
91}