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
18 static 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
owl_clk_set_regmap(const struct owl_clk_desc * desc,struct regmap * regmap)26 static 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
owl_clk_regmap_init(struct platform_device * pdev,struct owl_clk_desc * desc)41 int 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
owl_clk_probe(struct device * dev,struct clk_hw_onecell_data * hw_clks)65 int 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 }
92