1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * phy-keystone - USB PHY, talking to dwc3 controller in Keystone. |
4 | * |
5 | * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com |
6 | * |
7 | * Author: WingMan Kwok <w-kwok2@ti.com> |
8 | */ |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/platform_device.h> |
12 | #include <linux/usb/usb_phy_generic.h> |
13 | #include <linux/io.h> |
14 | #include <linux/of.h> |
15 | |
16 | #include "phy-generic.h" |
17 | |
18 | /* USB PHY control register offsets */ |
19 | #define USB_PHY_CTL_UTMI 0x0000 |
20 | #define USB_PHY_CTL_PIPE 0x0004 |
21 | #define USB_PHY_CTL_PARAM_1 0x0008 |
22 | #define USB_PHY_CTL_PARAM_2 0x000c |
23 | #define USB_PHY_CTL_CLOCK 0x0010 |
24 | #define USB_PHY_CTL_PLL 0x0014 |
25 | |
26 | #define PHY_REF_SSP_EN BIT(29) |
27 | |
28 | struct keystone_usbphy { |
29 | struct usb_phy_generic usb_phy_gen; |
30 | void __iomem *phy_ctrl; |
31 | }; |
32 | |
33 | static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset) |
34 | { |
35 | return readl(addr: base + offset); |
36 | } |
37 | |
38 | static inline void keystone_usbphy_writel(void __iomem *base, |
39 | u32 offset, u32 value) |
40 | { |
41 | writel(val: value, addr: base + offset); |
42 | } |
43 | |
44 | static int keystone_usbphy_init(struct usb_phy *phy) |
45 | { |
46 | struct keystone_usbphy *k_phy = dev_get_drvdata(dev: phy->dev); |
47 | u32 val; |
48 | |
49 | val = keystone_usbphy_readl(base: k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); |
50 | keystone_usbphy_writel(base: k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, |
51 | value: val | PHY_REF_SSP_EN); |
52 | return 0; |
53 | } |
54 | |
55 | static void keystone_usbphy_shutdown(struct usb_phy *phy) |
56 | { |
57 | struct keystone_usbphy *k_phy = dev_get_drvdata(dev: phy->dev); |
58 | u32 val; |
59 | |
60 | val = keystone_usbphy_readl(base: k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); |
61 | keystone_usbphy_writel(base: k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, |
62 | value: val & ~PHY_REF_SSP_EN); |
63 | } |
64 | |
65 | static int keystone_usbphy_probe(struct platform_device *pdev) |
66 | { |
67 | struct device *dev = &pdev->dev; |
68 | struct keystone_usbphy *k_phy; |
69 | int ret; |
70 | |
71 | k_phy = devm_kzalloc(dev, size: sizeof(*k_phy), GFP_KERNEL); |
72 | if (!k_phy) |
73 | return -ENOMEM; |
74 | |
75 | k_phy->phy_ctrl = devm_platform_ioremap_resource(pdev, index: 0); |
76 | if (IS_ERR(ptr: k_phy->phy_ctrl)) |
77 | return PTR_ERR(ptr: k_phy->phy_ctrl); |
78 | |
79 | ret = usb_phy_gen_create_phy(dev, nop: &k_phy->usb_phy_gen); |
80 | if (ret) |
81 | return ret; |
82 | |
83 | k_phy->usb_phy_gen.phy.init = keystone_usbphy_init; |
84 | k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown; |
85 | |
86 | platform_set_drvdata(pdev, data: k_phy); |
87 | |
88 | return usb_add_phy_dev(&k_phy->usb_phy_gen.phy); |
89 | } |
90 | |
91 | static void keystone_usbphy_remove(struct platform_device *pdev) |
92 | { |
93 | struct keystone_usbphy *k_phy = platform_get_drvdata(pdev); |
94 | |
95 | usb_remove_phy(&k_phy->usb_phy_gen.phy); |
96 | } |
97 | |
98 | static const struct of_device_id keystone_usbphy_ids[] = { |
99 | { .compatible = "ti,keystone-usbphy" }, |
100 | { } |
101 | }; |
102 | MODULE_DEVICE_TABLE(of, keystone_usbphy_ids); |
103 | |
104 | static struct platform_driver keystone_usbphy_driver = { |
105 | .probe = keystone_usbphy_probe, |
106 | .remove_new = keystone_usbphy_remove, |
107 | .driver = { |
108 | .name = "keystone-usbphy" , |
109 | .of_match_table = keystone_usbphy_ids, |
110 | }, |
111 | }; |
112 | |
113 | module_platform_driver(keystone_usbphy_driver); |
114 | |
115 | MODULE_ALIAS("platform:keystone-usbphy" ); |
116 | MODULE_AUTHOR("Texas Instruments Inc." ); |
117 | MODULE_DESCRIPTION("Keystone USB phy driver" ); |
118 | MODULE_LICENSE("GPL v2" ); |
119 | |