1 /*
2 * dwc3-of-simple.c - OF glue layer for simple integrations
3 *
4 * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Author: Felipe Balbi <balbi@ti.com>
7 *
8 * Copyright (C) 2018 BayLibre, SAS
9 * Author: Neil Armstrong <narmstron@baylibre.com>
10 *
11 * SPDX-License-Identifier: GPL-2.0+
12 */
13
14 #include <common.h>
15 #include <dm.h>
16 #include <reset.h>
17 #include <clk.h>
18
19 DECLARE_GLOBAL_DATA_PTR;
20
21 struct dwc3_of_simple {
22 struct clk_bulk clks;
23 struct reset_ctl_bulk resets;
24 };
25
dwc3_of_simple_reset_init(struct udevice * dev,struct dwc3_of_simple * simple)26 static int dwc3_of_simple_reset_init(struct udevice *dev,
27 struct dwc3_of_simple *simple)
28 {
29 int ret;
30
31 ret = reset_get_bulk(dev, &simple->resets);
32 if (ret == -ENOTSUPP)
33 return 0;
34 else if (ret)
35 return ret;
36
37 ret = reset_deassert_bulk(&simple->resets);
38 if (ret) {
39 reset_release_bulk(&simple->resets);
40 return ret;
41 }
42
43 return 0;
44 }
45
dwc3_of_simple_clk_init(struct udevice * dev,struct dwc3_of_simple * simple)46 static int dwc3_of_simple_clk_init(struct udevice *dev,
47 struct dwc3_of_simple *simple)
48 {
49 int ret;
50
51 ret = clk_get_bulk(dev, &simple->clks);
52 if (ret == -ENOSYS)
53 return 0;
54 if (ret)
55 return ret;
56
57 #if CONFIG_IS_ENABLED(CLK)
58 ret = clk_enable_bulk(&simple->clks);
59 if (ret) {
60 clk_release_bulk(&simple->clks);
61 return ret;
62 }
63 #endif
64
65 return 0;
66 }
67
dwc3_of_simple_probe(struct udevice * dev)68 static int dwc3_of_simple_probe(struct udevice *dev)
69 {
70 struct dwc3_of_simple *simple = dev_get_platdata(dev);
71 int ret;
72
73 ret = dwc3_of_simple_clk_init(dev, simple);
74 if (ret)
75 return ret;
76
77 ret = dwc3_of_simple_reset_init(dev, simple);
78 if (ret)
79 return ret;
80
81 return 0;
82 }
83
dwc3_of_simple_remove(struct udevice * dev)84 static int dwc3_of_simple_remove(struct udevice *dev)
85 {
86 struct dwc3_of_simple *simple = dev_get_platdata(dev);
87
88 reset_release_bulk(&simple->resets);
89
90 clk_release_bulk(&simple->clks);
91
92 return dm_scan_fdt_dev(dev);
93 }
94
95 static const struct udevice_id dwc3_of_simple_ids[] = {
96 { .compatible = "amlogic,meson-gxl-dwc3" },
97 { .compatible = "ti,dwc3" },
98 { }
99 };
100
101 U_BOOT_DRIVER(dwc3_of_simple) = {
102 .name = "dwc3-of-simple",
103 .id = UCLASS_SIMPLE_BUS,
104 .of_match = dwc3_of_simple_ids,
105 .probe = dwc3_of_simple_probe,
106 .remove = dwc3_of_simple_remove,
107 .platdata_auto_alloc_size = sizeof(struct dwc3_of_simple),
108 .flags = DM_FLAG_ALLOC_PRIV_DMA,
109 };
110