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/platform_device.h>
12 #include <linux/regmap.h>
13
14 #include "owl-common.h"
15
16 static const struct regmap_config owl_regmap_config = {
17 .reg_bits = 32,
18 .reg_stride = 4,
19 .val_bits = 32,
20 .max_register = 0x00cc,
21 };
22
owl_clk_set_regmap(const struct owl_clk_desc * desc,struct regmap * regmap)23 static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
24 struct regmap *regmap)
25 {
26 int i;
27 struct owl_clk_common *clks;
28
29 for (i = 0; i < desc->num_clks; i++) {
30 clks = desc->clks[i];
31 if (!clks)
32 continue;
33
34 clks->regmap = regmap;
35 }
36 }
37
owl_clk_regmap_init(struct platform_device * pdev,struct owl_clk_desc * desc)38 int owl_clk_regmap_init(struct platform_device *pdev,
39 struct owl_clk_desc *desc)
40 {
41 void __iomem *base;
42 struct regmap *regmap;
43
44 base = devm_platform_ioremap_resource(pdev, 0);
45 if (IS_ERR(base))
46 return PTR_ERR(base);
47
48 regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
49 if (IS_ERR(regmap)) {
50 pr_err("failed to init regmap\n");
51 return PTR_ERR(regmap);
52 }
53
54 owl_clk_set_regmap(desc, regmap);
55 desc->regmap = regmap;
56
57 return 0;
58 }
59
owl_clk_probe(struct device * dev,struct clk_hw_onecell_data * hw_clks)60 int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
61 {
62 int i, ret;
63 struct clk_hw *hw;
64
65 for (i = 0; i < hw_clks->num; i++) {
66 const char *name;
67
68 hw = hw_clks->hws[i];
69 if (IS_ERR_OR_NULL(hw))
70 continue;
71
72 name = hw->init->name;
73 ret = devm_clk_hw_register(dev, hw);
74 if (ret) {
75 dev_err(dev, "Couldn't register clock %d - %s\n",
76 i, name);
77 return ret;
78 }
79 }
80
81 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
82 if (ret)
83 dev_err(dev, "Failed to add clock provider\n");
84
85 return ret;
86 }
87