1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
5 */
6
7 #include <common.h>
8 #include <asm/io.h>
9 #include <bitfield.h>
10 #include <dm.h>
11 #include <errno.h>
12 #include <fdtdec.h>
13 #include <generic-phy.h>
14 #include <linux/libfdt.h>
15 #include <regmap.h>
16 #include <reset-uclass.h>
17 #include <syscon.h>
18 #include <wait_bit.h>
19
20 #include <linux/bitops.h>
21 #include <linux/compat.h>
22
23 DECLARE_GLOBAL_DATA_PTR;
24
25 /* Default PHY_SEL and REFCLKSEL configuration */
26 #define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
27
28 /* ports parameters overriding */
29 #define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc
30
31 #define PHYPARAM_REG 1
32 #define PHYCTRL_REG 2
33 #define PHYPARAM_NB 3
34
35 struct sti_usb_phy {
36 struct regmap *regmap;
37 struct reset_ctl global_ctl;
38 struct reset_ctl port_ctl;
39 int param;
40 int ctrl;
41 };
42
sti_usb_phy_deassert(struct sti_usb_phy * phy)43 static int sti_usb_phy_deassert(struct sti_usb_phy *phy)
44 {
45 int ret;
46
47 ret = reset_deassert(&phy->global_ctl);
48 if (ret < 0) {
49 pr_err("PHY global deassert failed: %d", ret);
50 return ret;
51 }
52
53 ret = reset_deassert(&phy->port_ctl);
54 if (ret < 0)
55 pr_err("PHY port deassert failed: %d", ret);
56
57 return ret;
58 }
59
sti_usb_phy_init(struct phy * usb_phy)60 static int sti_usb_phy_init(struct phy *usb_phy)
61 {
62 struct udevice *dev = usb_phy->dev;
63 struct sti_usb_phy *phy = dev_get_priv(dev);
64 void __iomem *reg;
65
66 /* set ctrl picophy value */
67 reg = (void __iomem *)phy->regmap->ranges[0].start + phy->ctrl;
68 /* CTRL_PORT mask is 0x1f */
69 clrsetbits_le32(reg, 0x1f, STIH407_USB_PICOPHY_CTRL_PORT_CONF);
70
71 /* set ports parameters overriding */
72 reg = (void __iomem *)phy->regmap->ranges[0].start + phy->param;
73 /* PARAM_DEF mask is 0xffffffff */
74 clrsetbits_le32(reg, 0xffffffff, STIH407_USB_PICOPHY_PARAM_DEF);
75
76 return sti_usb_phy_deassert(phy);
77 }
78
sti_usb_phy_exit(struct phy * usb_phy)79 static int sti_usb_phy_exit(struct phy *usb_phy)
80 {
81 struct udevice *dev = usb_phy->dev;
82 struct sti_usb_phy *phy = dev_get_priv(dev);
83 int ret;
84
85 ret = reset_assert(&phy->port_ctl);
86 if (ret < 0) {
87 pr_err("PHY port assert failed: %d", ret);
88 return ret;
89 }
90
91 ret = reset_assert(&phy->global_ctl);
92 if (ret < 0)
93 pr_err("PHY global assert failed: %d", ret);
94
95 return ret;
96 }
97
98 struct phy_ops sti_usb_phy_ops = {
99 .init = sti_usb_phy_init,
100 .exit = sti_usb_phy_exit,
101 };
102
sti_usb_phy_probe(struct udevice * dev)103 int sti_usb_phy_probe(struct udevice *dev)
104 {
105 struct sti_usb_phy *priv = dev_get_priv(dev);
106 struct udevice *syscon;
107 struct ofnode_phandle_args syscfg_phandle;
108 u32 cells[PHYPARAM_NB];
109 int ret, count;
110
111 /* get corresponding syscon phandle */
112 ret = dev_read_phandle_with_args(dev, "st,syscfg", NULL, 0, 0,
113 &syscfg_phandle);
114
115 if (ret < 0) {
116 pr_err("Can't get syscfg phandle: %d\n", ret);
117 return ret;
118 }
119
120 ret = uclass_get_device_by_ofnode(UCLASS_SYSCON, syscfg_phandle.node,
121 &syscon);
122 if (ret) {
123 pr_err("unable to find syscon device (%d)\n", ret);
124 return ret;
125 }
126
127 priv->regmap = syscon_get_regmap(syscon);
128 if (!priv->regmap) {
129 pr_err("unable to find regmap\n");
130 return -ENODEV;
131 }
132
133 /* get phy param offset */
134 count = fdtdec_get_int_array_count(gd->fdt_blob, dev_of_offset(dev),
135 "st,syscfg", cells,
136 ARRAY_SIZE(cells));
137
138 if (count < 0) {
139 pr_err("Bad PHY st,syscfg property %d\n", count);
140 return -EINVAL;
141 }
142
143 if (count > PHYPARAM_NB) {
144 pr_err("Unsupported PHY param count %d\n", count);
145 return -EINVAL;
146 }
147
148 priv->param = cells[PHYPARAM_REG];
149 priv->ctrl = cells[PHYCTRL_REG];
150
151 /* get global reset control */
152 ret = reset_get_by_name(dev, "global", &priv->global_ctl);
153 if (ret) {
154 pr_err("can't get global reset for %s (%d)", dev->name, ret);
155 return ret;
156 }
157
158 /* get port reset control */
159 ret = reset_get_by_name(dev, "port", &priv->port_ctl);
160 if (ret) {
161 pr_err("can't get port reset for %s (%d)", dev->name, ret);
162 return ret;
163 }
164
165 return 0;
166 }
167
168 static const struct udevice_id sti_usb_phy_ids[] = {
169 { .compatible = "st,stih407-usb2-phy" },
170 { }
171 };
172
173 U_BOOT_DRIVER(sti_usb_phy) = {
174 .name = "sti_usb_phy",
175 .id = UCLASS_PHY,
176 .of_match = sti_usb_phy_ids,
177 .probe = sti_usb_phy_probe,
178 .ops = &sti_usb_phy_ops,
179 .priv_auto_alloc_size = sizeof(struct sti_usb_phy),
180 };
181