tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Central probing code for the FOTG210 dual role driver
4 * We register one driver for the hardware and then we decide
5 * whether to proceed with probing the host or the peripheral
6 * driver.
7 */
8#include <linux/bitops.h>
9#include <linux/device.h>
10#include <linux/mfd/syscon.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14#include <linux/regmap.h>
15#include <linux/usb.h>
16#include <linux/usb/otg.h>
17
18#include "fotg210.h"
19
20/*
21 * Gemini-specific initialization function, only executed on the
22 * Gemini SoC using the global misc control register.
23 *
24 * The gemini USB blocks are connected to either Mini-A (host mode) or
25 * Mini-B (peripheral mode) plugs. There is no role switch support on the
26 * Gemini SoC, just either-or.
27 */
28#define GEMINI_GLOBAL_MISC_CTRL 0x30
29#define GEMINI_MISC_USB0_WAKEUP BIT(14)
30#define GEMINI_MISC_USB1_WAKEUP BIT(15)
31#define GEMINI_MISC_USB0_VBUS_ON BIT(22)
32#define GEMINI_MISC_USB1_VBUS_ON BIT(23)
33#define GEMINI_MISC_USB0_MINI_B BIT(29)
34#define GEMINI_MISC_USB1_MINI_B BIT(30)
35
36static int fotg210_gemini_init(struct device *dev, struct resource *res,
37 enum usb_dr_mode mode)
38{
39 struct device_node *np = dev->of_node;
40 struct regmap *map;
41 bool wakeup;
42 u32 mask, val;
43 int ret;
44
45 map = syscon_regmap_lookup_by_phandle(np, "syscon");
46 if (IS_ERR(map)) {
47 dev_err(dev, "no syscon\n");
48 return PTR_ERR(map);
49 }
50 wakeup = of_property_read_bool(np, "wakeup-source");
51
52 /*
53 * Figure out if this is USB0 or USB1 by simply checking the
54 * physical base address.
55 */
56 mask = 0;
57 if (res->start == 0x69000000) {
58 mask = GEMINI_MISC_USB1_VBUS_ON | GEMINI_MISC_USB1_MINI_B |
59 GEMINI_MISC_USB1_WAKEUP;
60 if (mode == USB_DR_MODE_HOST)
61 val = GEMINI_MISC_USB1_VBUS_ON;
62 else
63 val = GEMINI_MISC_USB1_MINI_B;
64 if (wakeup)
65 val |= GEMINI_MISC_USB1_WAKEUP;
66 } else {
67 mask = GEMINI_MISC_USB0_VBUS_ON | GEMINI_MISC_USB0_MINI_B |
68 GEMINI_MISC_USB0_WAKEUP;
69 if (mode == USB_DR_MODE_HOST)
70 val = GEMINI_MISC_USB0_VBUS_ON;
71 else
72 val = GEMINI_MISC_USB0_MINI_B;
73 if (wakeup)
74 val |= GEMINI_MISC_USB0_WAKEUP;
75 }
76
77 ret = regmap_update_bits(map, GEMINI_GLOBAL_MISC_CTRL, mask, val);
78 if (ret) {
79 dev_err(dev, "failed to initialize Gemini PHY\n");
80 return ret;
81 }
82
83 dev_info(dev, "initialized Gemini PHY in %s mode\n",
84 (mode == USB_DR_MODE_HOST) ? "host" : "gadget");
85 return 0;
86}
87
88static int fotg210_probe(struct platform_device *pdev)
89{
90 struct device *dev = &pdev->dev;
91 enum usb_dr_mode mode;
92 int ret;
93
94 mode = usb_get_dr_mode(dev);
95
96 if (of_device_is_compatible(dev->of_node, "cortina,gemini-usb")) {
97 struct resource *res;
98
99 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
100 ret = fotg210_gemini_init(dev, res, mode);
101 if (ret)
102 return ret;
103 }
104
105 if (mode == USB_DR_MODE_PERIPHERAL)
106 ret = fotg210_udc_probe(pdev);
107 else
108 ret = fotg210_hcd_probe(pdev);
109
110 return ret;
111}
112
113static int fotg210_remove(struct platform_device *pdev)
114{
115 struct device *dev = &pdev->dev;
116 enum usb_dr_mode mode;
117
118 mode = usb_get_dr_mode(dev);
119
120 if (mode == USB_DR_MODE_PERIPHERAL)
121 fotg210_udc_remove(pdev);
122 else
123 fotg210_hcd_remove(pdev);
124
125 return 0;
126}
127
128#ifdef CONFIG_OF
129static const struct of_device_id fotg210_of_match[] = {
130 { .compatible = "faraday,fotg210" },
131 {},
132};
133MODULE_DEVICE_TABLE(of, fotg210_of_match);
134#endif
135
136static struct platform_driver fotg210_driver = {
137 .driver = {
138 .name = "fotg210",
139 .of_match_table = of_match_ptr(fotg210_of_match),
140 },
141 .probe = fotg210_probe,
142 .remove = fotg210_remove,
143};
144
145static int __init fotg210_init(void)
146{
147 if (IS_ENABLED(CONFIG_USB_FOTG210_HCD) && !usb_disabled())
148 fotg210_hcd_init();
149 return platform_driver_register(&fotg210_driver);
150}
151module_init(fotg210_init);
152
153static void __exit fotg210_cleanup(void)
154{
155 platform_driver_unregister(&fotg210_driver);
156 if (IS_ENABLED(CONFIG_USB_FOTG210_HCD))
157 fotg210_hcd_cleanup();
158}
159module_exit(fotg210_cleanup);
160
161MODULE_AUTHOR("Yuan-Hsin Chen, Feng-Hsin Chiang");
162MODULE_LICENSE("GPL");
163MODULE_DESCRIPTION("FOTG210 Dual Role Controller Driver");