1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: WingMan Kwok <w-kwok2@ti.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/platform_device.h>
12*4882a593Smuzhiyun #include <linux/usb/usb_phy_generic.h>
13*4882a593Smuzhiyun #include <linux/io.h>
14*4882a593Smuzhiyun #include <linux/of.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include "phy-generic.h"
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun /* USB PHY control register offsets */
19*4882a593Smuzhiyun #define USB_PHY_CTL_UTMI 0x0000
20*4882a593Smuzhiyun #define USB_PHY_CTL_PIPE 0x0004
21*4882a593Smuzhiyun #define USB_PHY_CTL_PARAM_1 0x0008
22*4882a593Smuzhiyun #define USB_PHY_CTL_PARAM_2 0x000c
23*4882a593Smuzhiyun #define USB_PHY_CTL_CLOCK 0x0010
24*4882a593Smuzhiyun #define USB_PHY_CTL_PLL 0x0014
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun #define PHY_REF_SSP_EN BIT(29)
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun struct keystone_usbphy {
29*4882a593Smuzhiyun struct usb_phy_generic usb_phy_gen;
30*4882a593Smuzhiyun void __iomem *phy_ctrl;
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
keystone_usbphy_readl(void __iomem * base,u32 offset)33*4882a593Smuzhiyun static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun return readl(base + offset);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
keystone_usbphy_writel(void __iomem * base,u32 offset,u32 value)38*4882a593Smuzhiyun static inline void keystone_usbphy_writel(void __iomem *base,
39*4882a593Smuzhiyun u32 offset, u32 value)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun writel(value, base + offset);
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
keystone_usbphy_init(struct usb_phy * phy)44*4882a593Smuzhiyun static int keystone_usbphy_init(struct usb_phy *phy)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
47*4882a593Smuzhiyun u32 val;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
50*4882a593Smuzhiyun keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
51*4882a593Smuzhiyun val | PHY_REF_SSP_EN);
52*4882a593Smuzhiyun return 0;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
keystone_usbphy_shutdown(struct usb_phy * phy)55*4882a593Smuzhiyun static void keystone_usbphy_shutdown(struct usb_phy *phy)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
58*4882a593Smuzhiyun u32 val;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
61*4882a593Smuzhiyun keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
62*4882a593Smuzhiyun val &= ~PHY_REF_SSP_EN);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
keystone_usbphy_probe(struct platform_device * pdev)65*4882a593Smuzhiyun static int keystone_usbphy_probe(struct platform_device *pdev)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun struct device *dev = &pdev->dev;
68*4882a593Smuzhiyun struct keystone_usbphy *k_phy;
69*4882a593Smuzhiyun int ret;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL);
72*4882a593Smuzhiyun if (!k_phy)
73*4882a593Smuzhiyun return -ENOMEM;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun k_phy->phy_ctrl = devm_platform_ioremap_resource(pdev, 0);
76*4882a593Smuzhiyun if (IS_ERR(k_phy->phy_ctrl))
77*4882a593Smuzhiyun return PTR_ERR(k_phy->phy_ctrl);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen);
80*4882a593Smuzhiyun if (ret)
81*4882a593Smuzhiyun return ret;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun k_phy->usb_phy_gen.phy.init = keystone_usbphy_init;
84*4882a593Smuzhiyun k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun platform_set_drvdata(pdev, k_phy);
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun return usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun
keystone_usbphy_remove(struct platform_device * pdev)91*4882a593Smuzhiyun static int keystone_usbphy_remove(struct platform_device *pdev)
92*4882a593Smuzhiyun {
93*4882a593Smuzhiyun struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun usb_remove_phy(&k_phy->usb_phy_gen.phy);
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun return 0;
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun static const struct of_device_id keystone_usbphy_ids[] = {
101*4882a593Smuzhiyun { .compatible = "ti,keystone-usbphy" },
102*4882a593Smuzhiyun { }
103*4882a593Smuzhiyun };
104*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun static struct platform_driver keystone_usbphy_driver = {
107*4882a593Smuzhiyun .probe = keystone_usbphy_probe,
108*4882a593Smuzhiyun .remove = keystone_usbphy_remove,
109*4882a593Smuzhiyun .driver = {
110*4882a593Smuzhiyun .name = "keystone-usbphy",
111*4882a593Smuzhiyun .of_match_table = keystone_usbphy_ids,
112*4882a593Smuzhiyun },
113*4882a593Smuzhiyun };
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun module_platform_driver(keystone_usbphy_driver);
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun MODULE_ALIAS("platform:keystone-usbphy");
118*4882a593Smuzhiyun MODULE_AUTHOR("Texas Instruments Inc.");
119*4882a593Smuzhiyun MODULE_DESCRIPTION("Keystone USB phy driver");
120*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
121