1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
4 * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <dm/device.h>
10 #include <generic-phy.h>
11 #include <asm/io.h>
12
13 /* USB PHY control register offsets */
14 #define USB_PHY_CTL_UTMI 0x0000
15 #define USB_PHY_CTL_PIPE 0x0004
16 #define USB_PHY_CTL_PARAM_1 0x0008
17 #define USB_PHY_CTL_PARAM_2 0x000c
18 #define USB_PHY_CTL_CLOCK 0x0010
19 #define USB_PHY_CTL_PLL 0x0014
20
21 #define PHY_OTG_VBUSVLDECTSEL BIT(16)
22 #define PHY_REF_SSP_EN BIT(29)
23
24 struct keystone_usb_phy {
25 void __iomem *reg;
26 };
27
keystone_usb_init(struct phy * phy)28 static int keystone_usb_init(struct phy *phy)
29 {
30 u32 val;
31 struct udevice *dev = phy->dev;
32 struct keystone_usb_phy *keystone = dev_get_priv(dev);
33
34 /*
35 * VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
36 * It should always be cleared because our USB PHY has an onchip VBUS
37 * analog comparator.
38 */
39 val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
40 /* quit selecting the vbusvldextsel by default! */
41 val &= ~PHY_OTG_VBUSVLDECTSEL;
42 writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
43
44 return 0;
45 }
46
keystone_usb_power_on(struct phy * phy)47 static int keystone_usb_power_on(struct phy *phy)
48 {
49 u32 val;
50 struct udevice *dev = phy->dev;
51 struct keystone_usb_phy *keystone = dev_get_priv(dev);
52
53 val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
54 val |= PHY_REF_SSP_EN;
55 writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
56
57 return 0;
58 }
59
keystone_usb_power_off(struct phy * phy)60 static int keystone_usb_power_off(struct phy *phy)
61 {
62 u32 val;
63 struct udevice *dev = phy->dev;
64 struct keystone_usb_phy *keystone = dev_get_priv(dev);
65
66 val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
67 val &= ~PHY_REF_SSP_EN;
68 writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
69
70 return 0;
71 }
72
keystone_usb_exit(struct phy * phy)73 static int keystone_usb_exit(struct phy *phy)
74 {
75 return 0;
76 }
77
keystone_usb_phy_probe(struct udevice * dev)78 static int keystone_usb_phy_probe(struct udevice *dev)
79 {
80 struct keystone_usb_phy *keystone = dev_get_priv(dev);
81
82 keystone->reg = dev_remap_addr_index(dev, 0);
83 if (!keystone->reg) {
84 pr_err("unable to remap usb phy\n");
85 return -EINVAL;
86 }
87 return 0;
88 }
89
90 static const struct udevice_id keystone_usb_phy_ids[] = {
91 { .compatible = "ti,keystone-usbphy" },
92 { }
93 };
94
95 static struct phy_ops keystone_usb_phy_ops = {
96 .init = keystone_usb_init,
97 .power_on = keystone_usb_power_on,
98 .power_off = keystone_usb_power_off,
99 .exit = keystone_usb_exit,
100 };
101
102 U_BOOT_DRIVER(keystone_usb_phy) = {
103 .name = "keystone_usb_phy",
104 .id = UCLASS_PHY,
105 .of_match = keystone_usb_phy_ids,
106 .ops = &keystone_usb_phy_ops,
107 .probe = keystone_usb_phy_probe,
108 .priv_auto_alloc_size = sizeof(struct keystone_usb_phy),
109 };
110