1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2023 Neil Armstrong <neil.armstrong@linaro.org>
4 */
5
6 #include <linux/clk-provider.h>
7 #include <linux/mfd/syscon.h>
8 #include <linux/module.h>
9 #include <linux/of_device.h>
10 #include <linux/platform_device.h>
11 #include <linux/regmap.h>
12
13 #include "meson-clkc-utils.h"
14
meson_clk_hw_get(struct of_phandle_args * clkspec,void * clk_hw_data)15 struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_data)
16 {
17 const struct meson_clk_hw_data *data = clk_hw_data;
18 unsigned int idx = clkspec->args[0];
19
20 if (idx >= data->num) {
21 pr_err("%s: invalid index %u\n", __func__, idx);
22 return ERR_PTR(-EINVAL);
23 }
24
25 return data->hws[idx];
26 }
27 EXPORT_SYMBOL_NS_GPL(meson_clk_hw_get, "CLK_MESON");
28
meson_clkc_init(struct device * dev,struct regmap * map)29 static int meson_clkc_init(struct device *dev, struct regmap *map)
30 {
31 const struct meson_clkc_data *data;
32 struct clk_hw *hw;
33 int ret, i;
34
35 data = of_device_get_match_data(dev);
36 if (!data)
37 return -EINVAL;
38
39 if (data->init_count)
40 regmap_multi_reg_write(map, data->init_regs, data->init_count);
41
42 for (i = 0; i < data->hw_clks.num; i++) {
43 hw = data->hw_clks.hws[i];
44
45 /* array might be sparse */
46 if (!hw)
47 continue;
48
49 ret = devm_clk_hw_register(dev, hw);
50 if (ret) {
51 dev_err(dev, "registering %s clock failed\n",
52 hw->init->name);
53 return ret;
54 }
55 }
56
57 return devm_of_clk_add_hw_provider(dev, meson_clk_hw_get, (void *)&data->hw_clks);
58 }
59
meson_clkc_syscon_probe(struct platform_device * pdev)60 int meson_clkc_syscon_probe(struct platform_device *pdev)
61 {
62 struct device *dev = &pdev->dev;
63 struct device_node *np;
64 struct regmap *map;
65
66 np = of_get_parent(dev->of_node);
67 map = syscon_node_to_regmap(np);
68 of_node_put(np);
69 if (IS_ERR(map)) {
70 dev_err(dev, "failed to get parent syscon regmap\n");
71 return PTR_ERR(map);
72 }
73
74 return meson_clkc_init(dev, map);
75 }
76 EXPORT_SYMBOL_NS_GPL(meson_clkc_syscon_probe, "CLK_MESON");
77
meson_clkc_mmio_probe(struct platform_device * pdev)78 int meson_clkc_mmio_probe(struct platform_device *pdev)
79 {
80 const struct meson_clkc_data *data;
81 struct device *dev = &pdev->dev;
82 struct resource *res;
83 void __iomem *base;
84 struct regmap *map;
85 struct regmap_config regmap_cfg = {
86 .reg_bits = 32,
87 .val_bits = 32,
88 .reg_stride = 4,
89 };
90
91 data = of_device_get_match_data(dev);
92 if (!data)
93 return -EINVAL;
94
95 base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
96 if (IS_ERR(base))
97 return PTR_ERR(base);
98
99 regmap_cfg.max_register = resource_size(res) - regmap_cfg.reg_stride;
100
101 map = devm_regmap_init_mmio(dev, base, ®map_cfg);
102 if (IS_ERR(map))
103 return PTR_ERR(map);
104
105 return meson_clkc_init(dev, map);
106 }
107 EXPORT_SYMBOL_NS_GPL(meson_clkc_mmio_probe, "CLK_MESON");
108
109 MODULE_DESCRIPTION("Amlogic Clock Controller Utilities");
110 MODULE_LICENSE("GPL");
111 MODULE_IMPORT_NS("CLK_MESON");
112