1/*
2 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
3 *
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 */
13
14#include <linux/export.h>
15#include <linux/regmap.h>
16#include <linux/platform_device.h>
17#include <linux/clk-provider.h>
18#include <linux/reset-controller.h>
19
20#include "common.h"
21#include "clk-rcg.h"
22#include "clk-regmap.h"
23#include "reset.h"
24
25struct qcom_cc {
26	struct qcom_reset_controller reset;
27	struct clk_onecell_data data;
28	struct clk *clks[];
29};
30
31const
32struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
33{
34	if (!f)
35		return NULL;
36
37	for (; f->freq; f++)
38		if (rate <= f->freq)
39			return f;
40
41	/* Default to our fastest rate */
42	return f - 1;
43}
44EXPORT_SYMBOL_GPL(qcom_find_freq);
45
46int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
47{
48	int i, num_parents = __clk_get_num_parents(hw->clk);
49
50	for (i = 0; i < num_parents; i++)
51		if (src == map[i].src)
52			return i;
53
54	return -ENOENT;
55}
56EXPORT_SYMBOL_GPL(qcom_find_src_index);
57
58struct regmap *
59qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
60{
61	void __iomem *base;
62	struct resource *res;
63	struct device *dev = &pdev->dev;
64
65	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
66	base = devm_ioremap_resource(dev, res);
67	if (IS_ERR(base))
68		return ERR_CAST(base);
69
70	return devm_regmap_init_mmio(dev, base, desc->config);
71}
72EXPORT_SYMBOL_GPL(qcom_cc_map);
73
74int qcom_cc_really_probe(struct platform_device *pdev,
75			 const struct qcom_cc_desc *desc, struct regmap *regmap)
76{
77	int i, ret;
78	struct device *dev = &pdev->dev;
79	struct clk *clk;
80	struct clk_onecell_data *data;
81	struct clk **clks;
82	struct qcom_reset_controller *reset;
83	struct qcom_cc *cc;
84	size_t num_clks = desc->num_clks;
85	struct clk_regmap **rclks = desc->clks;
86
87	cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
88			  GFP_KERNEL);
89	if (!cc)
90		return -ENOMEM;
91
92	clks = cc->clks;
93	data = &cc->data;
94	data->clks = clks;
95	data->clk_num = num_clks;
96
97	for (i = 0; i < num_clks; i++) {
98		if (!rclks[i]) {
99			clks[i] = ERR_PTR(-ENOENT);
100			continue;
101		}
102		clk = devm_clk_register_regmap(dev, rclks[i]);
103		if (IS_ERR(clk))
104			return PTR_ERR(clk);
105		clks[i] = clk;
106	}
107
108	ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
109	if (ret)
110		return ret;
111
112	reset = &cc->reset;
113	reset->rcdev.of_node = dev->of_node;
114	reset->rcdev.ops = &qcom_reset_ops;
115	reset->rcdev.owner = dev->driver->owner;
116	reset->rcdev.nr_resets = desc->num_resets;
117	reset->regmap = regmap;
118	reset->reset_map = desc->resets;
119	platform_set_drvdata(pdev, &reset->rcdev);
120
121	ret = reset_controller_register(&reset->rcdev);
122	if (ret)
123		of_clk_del_provider(dev->of_node);
124
125	return ret;
126}
127EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
128
129int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
130{
131	struct regmap *regmap;
132
133	regmap = qcom_cc_map(pdev, desc);
134	if (IS_ERR(regmap))
135		return PTR_ERR(regmap);
136
137	return qcom_cc_really_probe(pdev, desc, regmap);
138}
139EXPORT_SYMBOL_GPL(qcom_cc_probe);
140
141void qcom_cc_remove(struct platform_device *pdev)
142{
143	of_clk_del_provider(pdev->dev.of_node);
144	reset_controller_unregister(platform_get_drvdata(pdev));
145}
146EXPORT_SYMBOL_GPL(qcom_cc_remove);
147