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 <log.h>
10 #include <dm/device.h>
11 #include <generic-phy.h>
12 #include <asm/io.h>
13 #include <asm/arch/psc_defs.h>
14 #include <linux/bitops.h>
15 #include <linux/delay.h>
16
17 /* USB PHY control register offsets */
18 #define USB_PHY_CTL_UTMI 0x0000
19 #define USB_PHY_CTL_PIPE 0x0004
20 #define USB_PHY_CTL_PARAM_1 0x0008
21 #define USB_PHY_CTL_PARAM_2 0x000c
22 #define USB_PHY_CTL_CLOCK 0x0010
23 #define USB_PHY_CTL_PLL 0x0014
24
25 #define PHY_OTG_VBUSVLDECTSEL BIT(16)
26 #define PHY_REF_SSP_EN BIT(29)
27
28 struct keystone_usb_phy {
29 u32 psc_domain;
30 void __iomem *reg;
31 };
32
keystone_usb_init(struct phy * phy)33 static int keystone_usb_init(struct phy *phy)
34 {
35 u32 val;
36 int rc;
37 struct udevice *dev = phy->dev;
38 struct keystone_usb_phy *keystone = dev_get_priv(dev);
39
40 /* Release USB from reset */
41 rc = psc_enable_module(keystone->psc_domain);
42 if (rc) {
43 debug("Cannot enable USB module");
44 return -rc;
45 }
46 mdelay(10);
47
48 /*
49 * VBUSVLDEXTSEL has a default value of 1 in BootCfg but shouldn't.
50 * It should always be cleared because our USB PHY has an onchip VBUS
51 * analog comparator.
52 */
53 val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
54 /* quit selecting the vbusvldextsel by default! */
55 val &= ~PHY_OTG_VBUSVLDECTSEL;
56 writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
57
58 return 0;
59 }
60
keystone_usb_power_on(struct phy * phy)61 static int keystone_usb_power_on(struct phy *phy)
62 {
63 u32 val;
64 struct udevice *dev = phy->dev;
65 struct keystone_usb_phy *keystone = dev_get_priv(dev);
66
67 val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
68 val |= PHY_REF_SSP_EN;
69 writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
70
71 return 0;
72 }
73
keystone_usb_power_off(struct phy * phy)74 static int keystone_usb_power_off(struct phy *phy)
75 {
76 u32 val;
77 struct udevice *dev = phy->dev;
78 struct keystone_usb_phy *keystone = dev_get_priv(dev);
79
80 val = readl(keystone->reg + USB_PHY_CTL_CLOCK);
81 val &= ~PHY_REF_SSP_EN;
82 writel(val, keystone->reg + USB_PHY_CTL_CLOCK);
83
84 return 0;
85 }
86
keystone_usb_exit(struct phy * phy)87 static int keystone_usb_exit(struct phy *phy)
88 {
89 struct udevice *dev = phy->dev;
90 struct keystone_usb_phy *keystone = dev_get_priv(dev);
91
92 if (psc_disable_module(keystone->psc_domain))
93 debug("failed to disable USB module!\n");
94
95 return 0;
96 }
97
keystone_usb_phy_probe(struct udevice * dev)98 static int keystone_usb_phy_probe(struct udevice *dev)
99 {
100 int rc;
101 struct keystone_usb_phy *keystone = dev_get_priv(dev);
102
103 rc = dev_read_u32(dev, "psc-domain", &keystone->psc_domain);
104 if (rc)
105 return rc;
106
107 keystone->reg = dev_remap_addr_index(dev, 0);
108 if (!keystone->reg) {
109 pr_err("unable to remap usb phy\n");
110 return -EINVAL;
111 }
112 return 0;
113 }
114
115 static const struct udevice_id keystone_usb_phy_ids[] = {
116 { .compatible = "ti,keystone-usbphy" },
117 { }
118 };
119
120 static struct phy_ops keystone_usb_phy_ops = {
121 .init = keystone_usb_init,
122 .power_on = keystone_usb_power_on,
123 .power_off = keystone_usb_power_off,
124 .exit = keystone_usb_exit,
125 };
126
127 U_BOOT_DRIVER(keystone_usb_phy) = {
128 .name = "keystone_usb_phy",
129 .id = UCLASS_PHY,
130 .of_match = keystone_usb_phy_ids,
131 .ops = &keystone_usb_phy_ops,
132 .probe = keystone_usb_phy_probe,
133 .priv_auto = sizeof(struct keystone_usb_phy),
134 };
135