blob: 12f8a265f77214a5e9a7891f44e9d1ff4eff7bf2 [file] [log] [blame]
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +01001// 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>
Simon Glassf7ae49f2020-05-10 11:40:05 -06009#include <log.h>
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +010010#include <dm/device.h>
11#include <generic-phy.h>
12#include <asm/io.h>
Jean-Jacques Hiblot2bbc1bb2019-09-11 11:33:56 +020013#include <asm/arch/psc_defs.h>
Simon Glasscd93d622020-05-10 11:40:13 -060014#include <linux/bitops.h>
Simon Glassc05ed002020-05-10 11:40:11 -060015#include <linux/delay.h>
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +010016
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
28struct keystone_usb_phy {
Jean-Jacques Hiblot2bbc1bb2019-09-11 11:33:56 +020029 u32 psc_domain;
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +010030 void __iomem *reg;
31};
32
33static int keystone_usb_init(struct phy *phy)
34{
35 u32 val;
Jean-Jacques Hiblot2bbc1bb2019-09-11 11:33:56 +020036 int rc;
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +010037 struct udevice *dev = phy->dev;
38 struct keystone_usb_phy *keystone = dev_get_priv(dev);
39
Jean-Jacques Hiblot2bbc1bb2019-09-11 11:33:56 +020040 /* 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
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +010048 /*
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
61static 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
74static 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
87static int keystone_usb_exit(struct phy *phy)
88{
Jean-Jacques Hiblot2bbc1bb2019-09-11 11:33:56 +020089 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
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +010095 return 0;
96}
97
98static int keystone_usb_phy_probe(struct udevice *dev)
99{
Jean-Jacques Hiblot2bbc1bb2019-09-11 11:33:56 +0200100 int rc;
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +0100101 struct keystone_usb_phy *keystone = dev_get_priv(dev);
102
Jean-Jacques Hiblot2bbc1bb2019-09-11 11:33:56 +0200103 rc = dev_read_u32(dev, "psc-domain", &keystone->psc_domain);
104 if (rc)
105 return rc;
106
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +0100107 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
115static const struct udevice_id keystone_usb_phy_ids[] = {
116 { .compatible = "ti,keystone-usbphy" },
117 { }
118};
119
120static 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
127U_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,
Simon Glass41575d82020-12-03 16:55:17 -0700133 .priv_auto = sizeof(struct keystone_usb_phy),
Jean-Jacques Hiblot4b127832018-12-04 11:12:59 +0100134};