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
25 struct qcom_cc {
26 struct qcom_reset_controller reset;
27 struct clk_onecell_data data;
28 struct clk *clks[];
29 };
30
31 const
qcom_find_freq(const struct freq_tbl * f,unsigned long rate)32 struct 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 }
44 EXPORT_SYMBOL_GPL(qcom_find_freq);
45
qcom_find_src_index(struct clk_hw * hw,const struct parent_map * map,u8 src)46 int 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 }
56 EXPORT_SYMBOL_GPL(qcom_find_src_index);
57
58 struct regmap *
qcom_cc_map(struct platform_device * pdev,const struct qcom_cc_desc * desc)59 qcom_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 }
72 EXPORT_SYMBOL_GPL(qcom_cc_map);
73
qcom_cc_really_probe(struct platform_device * pdev,const struct qcom_cc_desc * desc,struct regmap * regmap)74 int 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 }
127 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
128
qcom_cc_probe(struct platform_device * pdev,const struct qcom_cc_desc * desc)129 int 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 }
139 EXPORT_SYMBOL_GPL(qcom_cc_probe);
140
qcom_cc_remove(struct platform_device * pdev)141 void 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 }
146 EXPORT_SYMBOL_GPL(qcom_cc_remove);
147