GNU Linux-libre 4.19.211-gnu1
[releases.git] / drivers / gpu / drm / msm / hdmi / hdmi_phy.c
1 /*
2  * Copyright (c) 2016, The Linux Foundation. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 and
6  * only version 2 as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  */
13
14 #include <linux/of_device.h>
15
16 #include "hdmi.h"
17
18 static int msm_hdmi_phy_resource_init(struct hdmi_phy *phy)
19 {
20         struct hdmi_phy_cfg *cfg = phy->cfg;
21         struct device *dev = &phy->pdev->dev;
22         int i, ret;
23
24         phy->regs = devm_kcalloc(dev, cfg->num_regs, sizeof(phy->regs[0]),
25                                  GFP_KERNEL);
26         if (!phy->regs)
27                 return -ENOMEM;
28
29         phy->clks = devm_kcalloc(dev, cfg->num_clks, sizeof(phy->clks[0]),
30                                  GFP_KERNEL);
31         if (!phy->clks)
32                 return -ENOMEM;
33
34         for (i = 0; i < cfg->num_regs; i++) {
35                 struct regulator *reg;
36
37                 reg = devm_regulator_get(dev, cfg->reg_names[i]);
38                 if (IS_ERR(reg)) {
39                         ret = PTR_ERR(reg);
40                         dev_err(dev, "failed to get phy regulator: %s (%d)\n",
41                                 cfg->reg_names[i], ret);
42                         return ret;
43                 }
44
45                 phy->regs[i] = reg;
46         }
47
48         for (i = 0; i < cfg->num_clks; i++) {
49                 struct clk *clk;
50
51                 clk = msm_clk_get(phy->pdev, cfg->clk_names[i]);
52                 if (IS_ERR(clk)) {
53                         ret = PTR_ERR(clk);
54                         dev_err(dev, "failed to get phy clock: %s (%d)\n",
55                                 cfg->clk_names[i], ret);
56                         return ret;
57                 }
58
59                 phy->clks[i] = clk;
60         }
61
62         return 0;
63 }
64
65 int msm_hdmi_phy_resource_enable(struct hdmi_phy *phy)
66 {
67         struct hdmi_phy_cfg *cfg = phy->cfg;
68         struct device *dev = &phy->pdev->dev;
69         int i, ret = 0;
70
71         pm_runtime_get_sync(dev);
72
73         for (i = 0; i < cfg->num_regs; i++) {
74                 ret = regulator_enable(phy->regs[i]);
75                 if (ret)
76                         dev_err(dev, "failed to enable regulator: %s (%d)\n",
77                                 cfg->reg_names[i], ret);
78         }
79
80         for (i = 0; i < cfg->num_clks; i++) {
81                 ret = clk_prepare_enable(phy->clks[i]);
82                 if (ret)
83                         dev_err(dev, "failed to enable clock: %s (%d)\n",
84                                 cfg->clk_names[i], ret);
85         }
86
87         return ret;
88 }
89
90 void msm_hdmi_phy_resource_disable(struct hdmi_phy *phy)
91 {
92         struct hdmi_phy_cfg *cfg = phy->cfg;
93         struct device *dev = &phy->pdev->dev;
94         int i;
95
96         for (i = cfg->num_clks - 1; i >= 0; i--)
97                 clk_disable_unprepare(phy->clks[i]);
98
99         for (i = cfg->num_regs - 1; i >= 0; i--)
100                 regulator_disable(phy->regs[i]);
101
102         pm_runtime_put_sync(dev);
103 }
104
105 void msm_hdmi_phy_powerup(struct hdmi_phy *phy, unsigned long int pixclock)
106 {
107         if (!phy || !phy->cfg->powerup)
108                 return;
109
110         phy->cfg->powerup(phy, pixclock);
111 }
112
113 void msm_hdmi_phy_powerdown(struct hdmi_phy *phy)
114 {
115         if (!phy || !phy->cfg->powerdown)
116                 return;
117
118         phy->cfg->powerdown(phy);
119 }
120
121 static int msm_hdmi_phy_pll_init(struct platform_device *pdev,
122                              enum hdmi_phy_type type)
123 {
124         int ret;
125
126         switch (type) {
127         case MSM_HDMI_PHY_8960:
128                 ret = msm_hdmi_pll_8960_init(pdev);
129                 break;
130         case MSM_HDMI_PHY_8996:
131                 ret = msm_hdmi_pll_8996_init(pdev);
132                 break;
133         /*
134          * we don't have PLL support for these, don't report an error for now
135          */
136         case MSM_HDMI_PHY_8x60:
137         case MSM_HDMI_PHY_8x74:
138         default:
139                 ret = 0;
140                 break;
141         }
142
143         return ret;
144 }
145
146 static int msm_hdmi_phy_probe(struct platform_device *pdev)
147 {
148         struct device *dev = &pdev->dev;
149         struct hdmi_phy *phy;
150         int ret;
151
152         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
153         if (!phy)
154                 return -ENODEV;
155
156         phy->cfg = (struct hdmi_phy_cfg *)of_device_get_match_data(dev);
157         if (!phy->cfg)
158                 return -ENODEV;
159
160         phy->mmio = msm_ioremap(pdev, "hdmi_phy", "HDMI_PHY");
161         if (IS_ERR(phy->mmio)) {
162                 dev_err(dev, "%s: failed to map phy base\n", __func__);
163                 return -ENOMEM;
164         }
165
166         phy->pdev = pdev;
167
168         ret = msm_hdmi_phy_resource_init(phy);
169         if (ret)
170                 return ret;
171
172         pm_runtime_enable(&pdev->dev);
173
174         ret = msm_hdmi_phy_resource_enable(phy);
175         if (ret)
176                 return ret;
177
178         ret = msm_hdmi_phy_pll_init(pdev, phy->cfg->type);
179         if (ret) {
180                 dev_err(dev, "couldn't init PLL\n");
181                 msm_hdmi_phy_resource_disable(phy);
182                 return ret;
183         }
184
185         msm_hdmi_phy_resource_disable(phy);
186
187         platform_set_drvdata(pdev, phy);
188
189         return 0;
190 }
191
192 static int msm_hdmi_phy_remove(struct platform_device *pdev)
193 {
194         pm_runtime_disable(&pdev->dev);
195
196         return 0;
197 }
198
199 static const struct of_device_id msm_hdmi_phy_dt_match[] = {
200         { .compatible = "qcom,hdmi-phy-8660",
201           .data = &msm_hdmi_phy_8x60_cfg },
202         { .compatible = "qcom,hdmi-phy-8960",
203           .data = &msm_hdmi_phy_8960_cfg },
204         { .compatible = "qcom,hdmi-phy-8974",
205           .data = &msm_hdmi_phy_8x74_cfg },
206         { .compatible = "qcom,hdmi-phy-8084",
207           .data = &msm_hdmi_phy_8x74_cfg },
208         { .compatible = "qcom,hdmi-phy-8996",
209           .data = &msm_hdmi_phy_8996_cfg },
210         {}
211 };
212
213 static struct platform_driver msm_hdmi_phy_platform_driver = {
214         .probe      = msm_hdmi_phy_probe,
215         .remove     = msm_hdmi_phy_remove,
216         .driver     = {
217                 .name   = "msm_hdmi_phy",
218                 .of_match_table = msm_hdmi_phy_dt_match,
219         },
220 };
221
222 void __init msm_hdmi_phy_driver_register(void)
223 {
224         platform_driver_register(&msm_hdmi_phy_platform_driver);
225 }
226
227 void __exit msm_hdmi_phy_driver_unregister(void)
228 {
229         platform_driver_unregister(&msm_hdmi_phy_platform_driver);
230 }