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5173a975 LC |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright 2019 NXP | |
4 | */ | |
5 | ||
6 | #include <linux/clk.h> | |
7 | #include <linux/devfreq.h> | |
8 | #include <linux/device.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/of_device.h> | |
11 | #include <linux/pm_opp.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/slab.h> | |
14 | ||
15 | struct imx_bus { | |
16 | struct devfreq_dev_profile profile; | |
17 | struct devfreq *devfreq; | |
18 | struct clk *clk; | |
02355216 | 19 | struct platform_device *icc_pdev; |
5173a975 LC |
20 | }; |
21 | ||
22 | static int imx_bus_target(struct device *dev, | |
23 | unsigned long *freq, u32 flags) | |
24 | { | |
25 | struct dev_pm_opp *new_opp; | |
26 | int ret; | |
27 | ||
28 | new_opp = devfreq_recommended_opp(dev, freq, flags); | |
29 | if (IS_ERR(new_opp)) { | |
30 | ret = PTR_ERR(new_opp); | |
31 | dev_err(dev, "failed to get recommended opp: %d\n", ret); | |
32 | return ret; | |
33 | } | |
34 | dev_pm_opp_put(new_opp); | |
35 | ||
36 | return dev_pm_opp_set_rate(dev, *freq); | |
37 | } | |
38 | ||
39 | static int imx_bus_get_cur_freq(struct device *dev, unsigned long *freq) | |
40 | { | |
41 | struct imx_bus *priv = dev_get_drvdata(dev); | |
42 | ||
43 | *freq = clk_get_rate(priv->clk); | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
5173a975 LC |
48 | static void imx_bus_exit(struct device *dev) |
49 | { | |
02355216 LC |
50 | struct imx_bus *priv = dev_get_drvdata(dev); |
51 | ||
5173a975 | 52 | dev_pm_opp_of_remove_table(dev); |
02355216 LC |
53 | platform_device_unregister(priv->icc_pdev); |
54 | } | |
55 | ||
56 | /* imx_bus_init_icc() - register matching icc provider if required */ | |
57 | static int imx_bus_init_icc(struct device *dev) | |
58 | { | |
59 | struct imx_bus *priv = dev_get_drvdata(dev); | |
60 | const char *icc_driver_name; | |
61 | ||
2472934e | 62 | if (!of_get_property(dev->of_node, "#interconnect-cells", NULL)) |
02355216 LC |
63 | return 0; |
64 | if (!IS_ENABLED(CONFIG_INTERCONNECT_IMX)) { | |
65 | dev_warn(dev, "imx interconnect drivers disabled\n"); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | icc_driver_name = of_device_get_match_data(dev); | |
70 | if (!icc_driver_name) { | |
71 | dev_err(dev, "unknown interconnect driver\n"); | |
72 | return 0; | |
73 | } | |
74 | ||
75 | priv->icc_pdev = platform_device_register_data( | |
76 | dev, icc_driver_name, -1, NULL, 0); | |
77 | if (IS_ERR(priv->icc_pdev)) { | |
78 | dev_err(dev, "failed to register icc provider %s: %ld\n", | |
48bbf637 GS |
79 | icc_driver_name, PTR_ERR(priv->icc_pdev)); |
80 | return PTR_ERR(priv->icc_pdev); | |
02355216 LC |
81 | } |
82 | ||
83 | return 0; | |
5173a975 LC |
84 | } |
85 | ||
86 | static int imx_bus_probe(struct platform_device *pdev) | |
87 | { | |
88 | struct device *dev = &pdev->dev; | |
89 | struct imx_bus *priv; | |
90 | const char *gov = DEVFREQ_GOV_USERSPACE; | |
91 | int ret; | |
92 | ||
93 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
94 | if (!priv) | |
95 | return -ENOMEM; | |
96 | ||
97 | /* | |
98 | * Fetch the clock to adjust but don't explicitly enable. | |
99 | * | |
100 | * For imx bus clock clk_set_rate is safe no matter if the clock is on | |
101 | * or off and some peripheral side-buses might be off unless enabled by | |
102 | * drivers for devices on those specific buses. | |
103 | * | |
104 | * Rate adjustment on a disabled bus clock just takes effect later. | |
105 | */ | |
106 | priv->clk = devm_clk_get(dev, NULL); | |
107 | if (IS_ERR(priv->clk)) { | |
108 | ret = PTR_ERR(priv->clk); | |
109 | dev_err(dev, "failed to fetch clk: %d\n", ret); | |
110 | return ret; | |
111 | } | |
112 | platform_set_drvdata(pdev, priv); | |
113 | ||
114 | ret = dev_pm_opp_of_add_table(dev); | |
115 | if (ret < 0) { | |
116 | dev_err(dev, "failed to get OPP table\n"); | |
117 | return ret; | |
118 | } | |
119 | ||
5173a975 | 120 | priv->profile.target = imx_bus_target; |
5173a975 LC |
121 | priv->profile.exit = imx_bus_exit; |
122 | priv->profile.get_cur_freq = imx_bus_get_cur_freq; | |
123 | priv->profile.initial_freq = clk_get_rate(priv->clk); | |
124 | ||
125 | priv->devfreq = devm_devfreq_add_device(dev, &priv->profile, | |
126 | gov, NULL); | |
127 | if (IS_ERR(priv->devfreq)) { | |
128 | ret = PTR_ERR(priv->devfreq); | |
129 | dev_err(dev, "failed to add devfreq device: %d\n", ret); | |
130 | goto err; | |
131 | } | |
132 | ||
02355216 LC |
133 | ret = imx_bus_init_icc(dev); |
134 | if (ret) | |
135 | goto err; | |
136 | ||
5173a975 LC |
137 | return 0; |
138 | ||
139 | err: | |
140 | dev_pm_opp_of_remove_table(dev); | |
141 | return ret; | |
142 | } | |
143 | ||
144 | static const struct of_device_id imx_bus_of_match[] = { | |
02355216 LC |
145 | { .compatible = "fsl,imx8mq-noc", .data = "imx8mq-interconnect", }, |
146 | { .compatible = "fsl,imx8mm-noc", .data = "imx8mm-interconnect", }, | |
147 | { .compatible = "fsl,imx8mn-noc", .data = "imx8mn-interconnect", }, | |
9760660e | 148 | { .compatible = "fsl,imx8mp-noc", .data = "imx8mp-interconnect", }, |
5173a975 LC |
149 | { .compatible = "fsl,imx8m-noc", }, |
150 | { .compatible = "fsl,imx8m-nic", }, | |
151 | { /* sentinel */ }, | |
152 | }; | |
153 | MODULE_DEVICE_TABLE(of, imx_bus_of_match); | |
154 | ||
155 | static struct platform_driver imx_bus_platdrv = { | |
156 | .probe = imx_bus_probe, | |
157 | .driver = { | |
158 | .name = "imx-bus-devfreq", | |
ca948312 | 159 | .of_match_table = imx_bus_of_match, |
5173a975 LC |
160 | }, |
161 | }; | |
162 | module_platform_driver(imx_bus_platdrv); | |
163 | ||
164 | MODULE_DESCRIPTION("Generic i.MX bus frequency scaling driver"); | |
165 | MODULE_AUTHOR("Leonard Crestez <leonard.crestez@nxp.com>"); | |
166 | MODULE_LICENSE("GPL v2"); |