1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2018, The Linux Foundation. All rights reserved.
3
4 #include <linux/kernel.h>
5 #include <linux/init.h>
6 #include <linux/module.h>
7 #include <linux/platform_device.h>
8 #include <linux/of.h>
9 #include <linux/clk.h>
10 #include <linux/clk-provider.h>
11 #include <linux/regmap.h>
12
13 #include "clk-regmap.h"
14 #include "clk-hfpll.h"
15
16 static const struct hfpll_data hdata = {
17 .mode_reg = 0x00,
18 .l_reg = 0x04,
19 .m_reg = 0x08,
20 .n_reg = 0x0c,
21 .user_reg = 0x10,
22 .config_reg = 0x14,
23 .config_val = 0x430405d,
24 .status_reg = 0x1c,
25 .lock_bit = 16,
26
27 .user_val = 0x8,
28 .user_vco_mask = 0x100000,
29 .low_vco_max_rate = 1248000000,
30 .min_rate = 537600000UL,
31 .max_rate = 2900000000UL,
32 };
33
34 static const struct of_device_id qcom_hfpll_match_table[] = {
35 { .compatible = "qcom,hfpll" },
36 { }
37 };
38 MODULE_DEVICE_TABLE(of, qcom_hfpll_match_table);
39
40 static const struct regmap_config hfpll_regmap_config = {
41 .reg_bits = 32,
42 .reg_stride = 4,
43 .val_bits = 32,
44 .max_register = 0x30,
45 .fast_io = true,
46 };
47
qcom_hfpll_probe(struct platform_device * pdev)48 static int qcom_hfpll_probe(struct platform_device *pdev)
49 {
50 struct resource *res;
51 struct device *dev = &pdev->dev;
52 void __iomem *base;
53 struct regmap *regmap;
54 struct clk_hfpll *h;
55 struct clk_init_data init = {
56 .num_parents = 1,
57 .ops = &clk_ops_hfpll,
58 /*
59 * rather than marking the clock critical and forcing the clock
60 * to be always enabled, we make sure that the clock is not
61 * disabled: the firmware remains responsible of enabling this
62 * clock (for more info check the commit log)
63 */
64 .flags = CLK_IGNORE_UNUSED,
65 };
66 int ret;
67 struct clk_parent_data pdata = { .index = 0 };
68
69 h = devm_kzalloc(dev, sizeof(*h), GFP_KERNEL);
70 if (!h)
71 return -ENOMEM;
72
73 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
74 base = devm_ioremap_resource(dev, res);
75 if (IS_ERR(base))
76 return PTR_ERR(base);
77
78 regmap = devm_regmap_init_mmio(&pdev->dev, base, &hfpll_regmap_config);
79 if (IS_ERR(regmap))
80 return PTR_ERR(regmap);
81
82 if (of_property_read_string_index(dev->of_node, "clock-output-names",
83 0, &init.name))
84 return -ENODEV;
85
86 init.parent_data = &pdata;
87
88 h->d = &hdata;
89 h->clkr.hw.init = &init;
90 spin_lock_init(&h->lock);
91
92 ret = devm_clk_register_regmap(dev, &h->clkr);
93 if (ret) {
94 dev_err(dev, "failed to register regmap clock: %d\n", ret);
95 return ret;
96 }
97
98 return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
99 &h->clkr.hw);
100 }
101
102 static struct platform_driver qcom_hfpll_driver = {
103 .probe = qcom_hfpll_probe,
104 .driver = {
105 .name = "qcom-hfpll",
106 .of_match_table = qcom_hfpll_match_table,
107 },
108 };
109 module_platform_driver(qcom_hfpll_driver);
110
111 MODULE_DESCRIPTION("QCOM HFPLL Clock Driver");
112 MODULE_LICENSE("GPL v2");
113 MODULE_ALIAS("platform:qcom-hfpll");
114