1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2023 Nuvoton Technology corporation.
3
4 #include <linux/module.h>
5 #include <linux/platform_device.h>
6 #include <linux/pm_runtime.h>
7 #include <linux/usb/chipidea.h>
8 #include <linux/clk.h>
9 #include <linux/io.h>
10 #include <linux/reset-controller.h>
11 #include <linux/of.h>
12
13 #include "ci.h"
14
15 struct npcm_udc_data {
16 struct platform_device *ci;
17 struct clk *core_clk;
18 struct ci_hdrc_platform_data pdata;
19 };
20
npcm_udc_notify_event(struct ci_hdrc * ci,unsigned event)21 static int npcm_udc_notify_event(struct ci_hdrc *ci, unsigned event)
22 {
23 struct device *dev = ci->dev->parent;
24
25 switch (event) {
26 case CI_HDRC_CONTROLLER_RESET_EVENT:
27 /* clear all mode bits */
28 hw_write(ci, OP_USBMODE, 0xffffffff, 0x0);
29 break;
30 default:
31 dev_dbg(dev, "unknown ci_hdrc event (%d)\n",event);
32 break;
33 }
34
35 return 0;
36 }
37
npcm_udc_probe(struct platform_device * pdev)38 static int npcm_udc_probe(struct platform_device *pdev)
39 {
40 int ret;
41 struct npcm_udc_data *ci;
42 struct platform_device *plat_ci;
43 struct device *dev = &pdev->dev;
44
45 ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
46 if (!ci)
47 return -ENOMEM;
48 platform_set_drvdata(pdev, ci);
49
50 ci->core_clk = devm_clk_get_optional(dev, NULL);
51 if (IS_ERR(ci->core_clk))
52 return PTR_ERR(ci->core_clk);
53
54 ret = clk_prepare_enable(ci->core_clk);
55 if (ret)
56 return dev_err_probe(dev, ret, "failed to enable the clock: %d\n", ret);
57
58 ci->pdata.name = dev_name(dev);
59 ci->pdata.capoffset = DEF_CAPOFFSET;
60 ci->pdata.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
61 CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS;
62 ci->pdata.phy_mode = USBPHY_INTERFACE_MODE_UTMI;
63 ci->pdata.notify_event = npcm_udc_notify_event;
64
65 plat_ci = ci_hdrc_add_device(dev, pdev->resource, pdev->num_resources,
66 &ci->pdata);
67 if (IS_ERR(plat_ci)) {
68 ret = PTR_ERR(plat_ci);
69 dev_err(dev, "failed to register HDRC NPCM device: %d\n", ret);
70 goto clk_err;
71 }
72
73 pm_runtime_no_callbacks(dev);
74 pm_runtime_enable(dev);
75
76 return 0;
77
78 clk_err:
79 clk_disable_unprepare(ci->core_clk);
80 return ret;
81 }
82
npcm_udc_remove(struct platform_device * pdev)83 static int npcm_udc_remove(struct platform_device *pdev)
84 {
85 struct npcm_udc_data *ci = platform_get_drvdata(pdev);
86
87 pm_runtime_disable(&pdev->dev);
88 ci_hdrc_remove_device(ci->ci);
89 clk_disable_unprepare(ci->core_clk);
90
91 return 0;
92 }
93
94 static const struct of_device_id npcm_udc_dt_match[] = {
95 { .compatible = "nuvoton,npcm750-udc", },
96 { .compatible = "nuvoton,npcm845-udc", },
97 { }
98 };
99 MODULE_DEVICE_TABLE(of, npcm_udc_dt_match);
100
101 static struct platform_driver npcm_udc_driver = {
102 .probe = npcm_udc_probe,
103 .remove = npcm_udc_remove,
104 .driver = {
105 .name = "npcm_udc",
106 .of_match_table = npcm_udc_dt_match,
107 },
108 };
109
110 module_platform_driver(npcm_udc_driver);
111
112 MODULE_DESCRIPTION("NPCM USB device controller driver");
113 MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
114 MODULE_LICENSE("GPL v2");
115