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/module.h>
16#include <linux/regmap.h>
17#include <linux/platform_device.h>
18#include <linux/clk-provider.h>
19#include <linux/reset-controller.h>
20
21#include "common.h"
22#include "clk-rcg.h"
23#include "clk-regmap.h"
24#include "reset.h"
25#include "gdsc.h"
26
27struct qcom_cc {
28	struct qcom_reset_controller reset;
29	struct clk_onecell_data data;
30	struct clk *clks[];
31};
32
33const
34struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
35{
36	if (!f)
37		return NULL;
38
39	for (; f->freq; f++)
40		if (rate <= f->freq)
41			return f;
42
43	/* Default to our fastest rate */
44	return f - 1;
45}
46EXPORT_SYMBOL_GPL(qcom_find_freq);
47
48int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
49{
50	int i, num_parents = clk_hw_get_num_parents(hw);
51
52	for (i = 0; i < num_parents; i++)
53		if (src == map[i].src)
54			return i;
55
56	return -ENOENT;
57}
58EXPORT_SYMBOL_GPL(qcom_find_src_index);
59
60struct regmap *
61qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
62{
63	void __iomem *base;
64	struct resource *res;
65	struct device *dev = &pdev->dev;
66
67	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
68	base = devm_ioremap_resource(dev, res);
69	if (IS_ERR(base))
70		return ERR_CAST(base);
71
72	return devm_regmap_init_mmio(dev, base, desc->config);
73}
74EXPORT_SYMBOL_GPL(qcom_cc_map);
75
76static void qcom_cc_del_clk_provider(void *data)
77{
78	of_clk_del_provider(data);
79}
80
81static void qcom_cc_reset_unregister(void *data)
82{
83	reset_controller_unregister(data);
84}
85
86static void qcom_cc_gdsc_unregister(void *data)
87{
88	gdsc_unregister(data);
89}
90
91int qcom_cc_really_probe(struct platform_device *pdev,
92			 const struct qcom_cc_desc *desc, struct regmap *regmap)
93{
94	int i, ret;
95	struct device *dev = &pdev->dev;
96	struct clk *clk;
97	struct clk_onecell_data *data;
98	struct clk **clks;
99	struct qcom_reset_controller *reset;
100	struct qcom_cc *cc;
101	size_t num_clks = desc->num_clks;
102	struct clk_regmap **rclks = desc->clks;
103
104	cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
105			  GFP_KERNEL);
106	if (!cc)
107		return -ENOMEM;
108
109	clks = cc->clks;
110	data = &cc->data;
111	data->clks = clks;
112	data->clk_num = num_clks;
113
114	for (i = 0; i < num_clks; i++) {
115		if (!rclks[i]) {
116			clks[i] = ERR_PTR(-ENOENT);
117			continue;
118		}
119		clk = devm_clk_register_regmap(dev, rclks[i]);
120		if (IS_ERR(clk))
121			return PTR_ERR(clk);
122		clks[i] = clk;
123	}
124
125	ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
126	if (ret)
127		return ret;
128
129	devm_add_action(dev, qcom_cc_del_clk_provider, pdev->dev.of_node);
130
131	reset = &cc->reset;
132	reset->rcdev.of_node = dev->of_node;
133	reset->rcdev.ops = &qcom_reset_ops;
134	reset->rcdev.owner = dev->driver->owner;
135	reset->rcdev.nr_resets = desc->num_resets;
136	reset->regmap = regmap;
137	reset->reset_map = desc->resets;
138
139	ret = reset_controller_register(&reset->rcdev);
140	if (ret)
141		return ret;
142
143	devm_add_action(dev, qcom_cc_reset_unregister, &reset->rcdev);
144
145	if (desc->gdscs && desc->num_gdscs) {
146		ret = gdsc_register(dev, desc->gdscs, desc->num_gdscs,
147				    &reset->rcdev, regmap);
148		if (ret)
149			return ret;
150	}
151
152	devm_add_action(dev, qcom_cc_gdsc_unregister, dev);
153
154
155	return 0;
156}
157EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
158
159int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
160{
161	struct regmap *regmap;
162
163	regmap = qcom_cc_map(pdev, desc);
164	if (IS_ERR(regmap))
165		return PTR_ERR(regmap);
166
167	return qcom_cc_really_probe(pdev, desc, regmap);
168}
169EXPORT_SYMBOL_GPL(qcom_cc_probe);
170
171MODULE_LICENSE("GPL v2");
172