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
15struct npcm_udc_data {
16	struct platform_device	*ci;
17	struct clk		*core_clk;
18	struct ci_hdrc_platform_data pdata;
19};
20
21static 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
38static 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
78clk_err:
79	clk_disable_unprepare(ci->core_clk);
80	return ret;
81}
82
83static 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
94static const struct of_device_id npcm_udc_dt_match[] = {
95	{ .compatible = "nuvoton,npcm750-udc", },
96	{ .compatible = "nuvoton,npcm845-udc", },
97	{ }
98};
99MODULE_DEVICE_TABLE(of, npcm_udc_dt_match);
100
101static 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
110module_platform_driver(npcm_udc_driver);
111
112MODULE_DESCRIPTION("NPCM USB device controller driver");
113MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
114MODULE_LICENSE("GPL v2");
115