xref: /openbmc/linux/drivers/clk/clk-rk808.c (revision 2dc51ca8)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Clkout driver for Rockchip RK808
4  *
5  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
6  *
7  * Author:Chris Zhong <zyw@rock-chips.com>
8  */
9 
10 #include <linux/clk-provider.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/mfd/rk808.h>
15 
16 struct rk808_clkout {
17 	struct regmap		*regmap;
18 	struct clk_hw		clkout1_hw;
19 	struct clk_hw		clkout2_hw;
20 };
21 
rk808_clkout_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)22 static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
23 					      unsigned long parent_rate)
24 {
25 	return 32768;
26 }
27 
rk808_clkout2_enable(struct clk_hw * hw,bool enable)28 static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
29 {
30 	struct rk808_clkout *rk808_clkout = container_of(hw,
31 							 struct rk808_clkout,
32 							 clkout2_hw);
33 
34 	return regmap_update_bits(rk808_clkout->regmap, RK808_CLK32OUT_REG,
35 				  CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
36 }
37 
rk808_clkout2_prepare(struct clk_hw * hw)38 static int rk808_clkout2_prepare(struct clk_hw *hw)
39 {
40 	return rk808_clkout2_enable(hw, true);
41 }
42 
rk808_clkout2_unprepare(struct clk_hw * hw)43 static void rk808_clkout2_unprepare(struct clk_hw *hw)
44 {
45 	rk808_clkout2_enable(hw, false);
46 }
47 
rk808_clkout2_is_prepared(struct clk_hw * hw)48 static int rk808_clkout2_is_prepared(struct clk_hw *hw)
49 {
50 	struct rk808_clkout *rk808_clkout = container_of(hw,
51 							 struct rk808_clkout,
52 							 clkout2_hw);
53 	uint32_t val;
54 
55 	int ret = regmap_read(rk808_clkout->regmap, RK808_CLK32OUT_REG, &val);
56 
57 	if (ret < 0)
58 		return ret;
59 
60 	return (val & CLK32KOUT2_EN) ? 1 : 0;
61 }
62 
63 static const struct clk_ops rk808_clkout1_ops = {
64 	.recalc_rate = rk808_clkout_recalc_rate,
65 };
66 
67 static const struct clk_ops rk808_clkout2_ops = {
68 	.prepare = rk808_clkout2_prepare,
69 	.unprepare = rk808_clkout2_unprepare,
70 	.is_prepared = rk808_clkout2_is_prepared,
71 	.recalc_rate = rk808_clkout_recalc_rate,
72 };
73 
74 static struct clk_hw *
of_clk_rk808_get(struct of_phandle_args * clkspec,void * data)75 of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
76 {
77 	struct rk808_clkout *rk808_clkout = data;
78 	unsigned int idx = clkspec->args[0];
79 
80 	if (idx >= 2) {
81 		pr_err("%s: invalid index %u\n", __func__, idx);
82 		return ERR_PTR(-EINVAL);
83 	}
84 
85 	return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
86 }
87 
rk817_clkout2_enable(struct clk_hw * hw,bool enable)88 static int rk817_clkout2_enable(struct clk_hw *hw, bool enable)
89 {
90 	struct rk808_clkout *rk808_clkout = container_of(hw,
91 							 struct rk808_clkout,
92 							 clkout2_hw);
93 
94 	return regmap_update_bits(rk808_clkout->regmap, RK817_SYS_CFG(1),
95 				  RK817_CLK32KOUT2_EN,
96 				  enable ? RK817_CLK32KOUT2_EN : 0);
97 }
98 
rk817_clkout2_prepare(struct clk_hw * hw)99 static int rk817_clkout2_prepare(struct clk_hw *hw)
100 {
101 	return rk817_clkout2_enable(hw, true);
102 }
103 
rk817_clkout2_unprepare(struct clk_hw * hw)104 static void rk817_clkout2_unprepare(struct clk_hw *hw)
105 {
106 	rk817_clkout2_enable(hw, false);
107 }
108 
rk817_clkout2_is_prepared(struct clk_hw * hw)109 static int rk817_clkout2_is_prepared(struct clk_hw *hw)
110 {
111 	struct rk808_clkout *rk808_clkout = container_of(hw,
112 							 struct rk808_clkout,
113 							 clkout2_hw);
114 	unsigned int val;
115 
116 	int ret = regmap_read(rk808_clkout->regmap, RK817_SYS_CFG(1), &val);
117 
118 	if (ret < 0)
119 		return 0;
120 
121 	return (val & RK817_CLK32KOUT2_EN) ? 1 : 0;
122 }
123 
124 static const struct clk_ops rk817_clkout2_ops = {
125 	.prepare = rk817_clkout2_prepare,
126 	.unprepare = rk817_clkout2_unprepare,
127 	.is_prepared = rk817_clkout2_is_prepared,
128 	.recalc_rate = rk808_clkout_recalc_rate,
129 };
130 
rkpmic_get_ops(long variant)131 static const struct clk_ops *rkpmic_get_ops(long variant)
132 {
133 	switch (variant) {
134 	case RK809_ID:
135 	case RK817_ID:
136 		return &rk817_clkout2_ops;
137 	/*
138 	 * For the default case, it match the following PMIC type.
139 	 * RK805_ID
140 	 * RK808_ID
141 	 * RK818_ID
142 	 */
143 	default:
144 		return &rk808_clkout2_ops;
145 	}
146 }
147 
rk808_clkout_probe(struct platform_device * pdev)148 static int rk808_clkout_probe(struct platform_device *pdev)
149 {
150 	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
151 	struct device *dev = &pdev->dev;
152 	struct clk_init_data init = {};
153 	struct rk808_clkout *rk808_clkout;
154 	int ret;
155 
156 	dev->of_node = pdev->dev.parent->of_node;
157 
158 	rk808_clkout = devm_kzalloc(dev,
159 				    sizeof(*rk808_clkout), GFP_KERNEL);
160 	if (!rk808_clkout)
161 		return -ENOMEM;
162 
163 	rk808_clkout->regmap = dev_get_regmap(pdev->dev.parent, NULL);
164 	if (!rk808_clkout->regmap)
165 		return -ENODEV;
166 
167 	init.parent_names = NULL;
168 	init.num_parents = 0;
169 	init.name = "rk808-clkout1";
170 	init.ops = &rk808_clkout1_ops;
171 	rk808_clkout->clkout1_hw.init = &init;
172 
173 	/* optional override of the clockname */
174 	of_property_read_string_index(dev->of_node, "clock-output-names",
175 				      0, &init.name);
176 
177 	ret = devm_clk_hw_register(dev, &rk808_clkout->clkout1_hw);
178 	if (ret)
179 		return ret;
180 
181 	init.name = "rk808-clkout2";
182 	init.ops = rkpmic_get_ops(rk808->variant);
183 	rk808_clkout->clkout2_hw.init = &init;
184 
185 	/* optional override of the clockname */
186 	of_property_read_string_index(dev->of_node, "clock-output-names",
187 				      1, &init.name);
188 
189 	ret = devm_clk_hw_register(dev, &rk808_clkout->clkout2_hw);
190 	if (ret)
191 		return ret;
192 
193 	return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
194 					   rk808_clkout);
195 }
196 
197 static struct platform_driver rk808_clkout_driver = {
198 	.probe = rk808_clkout_probe,
199 	.driver		= {
200 		.name	= "rk808-clkout",
201 	},
202 };
203 
204 module_platform_driver(rk808_clkout_driver);
205 
206 MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
207 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
208 MODULE_LICENSE("GPL");
209 MODULE_ALIAS("platform:rk808-clkout");
210