1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * OMAP USB2 PHY LAYER
4 *
5 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
6 * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
7 */
8
9 #include <common.h>
10 #include <asm/io.h>
11 #include <dm.h>
12 #include <errno.h>
13 #include <generic-phy.h>
14 #include <regmap.h>
15 #include <syscon.h>
16
17 #define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT BIT(0)
18
19 #define OMAP_DEV_PHY_PD BIT(0)
20 #define OMAP_USB2_PHY_PD BIT(28)
21
22 #define AM437X_USB2_PHY_PD BIT(0)
23 #define AM437X_USB2_OTG_PD BIT(1)
24 #define AM437X_USB2_OTGVDET_EN BIT(19)
25 #define AM437X_USB2_OTGSESSEND_EN BIT(20)
26
27 #define USB2PHY_DISCON_BYP_LATCH BIT(31)
28 #define USB2PHY_ANA_CONFIG1 (0x4c)
29
30 DECLARE_GLOBAL_DATA_PTR;
31
32 struct omap_usb2_phy {
33 struct regmap *pwr_regmap;
34 ulong flags;
35 void *phy_base;
36 u32 pwr_reg_offset;
37 };
38
39 struct usb_phy_data {
40 const char *label;
41 u8 flags;
42 u32 mask;
43 u32 power_on;
44 u32 power_off;
45 };
46
47 static const struct usb_phy_data omap5_usb2_data = {
48 .label = "omap5_usb2",
49 .flags = 0,
50 .mask = OMAP_DEV_PHY_PD,
51 .power_off = OMAP_DEV_PHY_PD,
52 };
53
54 static const struct usb_phy_data dra7x_usb2_data = {
55 .label = "dra7x_usb2",
56 .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
57 .mask = OMAP_DEV_PHY_PD,
58 .power_off = OMAP_DEV_PHY_PD,
59 };
60
61 static const struct usb_phy_data dra7x_usb2_phy2_data = {
62 .label = "dra7x_usb2_phy2",
63 .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
64 .mask = OMAP_USB2_PHY_PD,
65 .power_off = OMAP_USB2_PHY_PD,
66 };
67
68 static const struct usb_phy_data am437x_usb2_data = {
69 .label = "am437x_usb2",
70 .flags = 0,
71 .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
72 AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
73 .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
74 .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
75 };
76
77 static const struct udevice_id omap_usb2_id_table[] = {
78 {
79 .compatible = "ti,omap5-usb2",
80 .data = (ulong)&omap5_usb2_data,
81 },
82 {
83 .compatible = "ti,dra7x-usb2",
84 .data = (ulong)&dra7x_usb2_data,
85 },
86 {
87 .compatible = "ti,dra7x-usb2-phy2",
88 .data = (ulong)&dra7x_usb2_phy2_data,
89 },
90 {
91 .compatible = "ti,am437x-usb2",
92 .data = (ulong)&am437x_usb2_data,
93 },
94 {},
95 };
96
omap_usb_phy_power(struct phy * usb_phy,bool on)97 static int omap_usb_phy_power(struct phy *usb_phy, bool on)
98 {
99 struct udevice *dev = usb_phy->dev;
100 const struct usb_phy_data *data;
101 const struct omap_usb2_phy *phy = dev_get_priv(dev);
102 u32 val;
103 int rc;
104
105 data = (const struct usb_phy_data *)dev_get_driver_data(dev);
106 if (!data)
107 return -EINVAL;
108
109 rc = regmap_read(phy->pwr_regmap, phy->pwr_reg_offset, &val);
110 if (rc)
111 return rc;
112 val &= ~data->mask;
113 if (on)
114 val |= data->power_on;
115 else
116 val |= data->power_off;
117 rc = regmap_write(phy->pwr_regmap, phy->pwr_reg_offset, val);
118 if (rc)
119 return rc;
120
121 return 0;
122 }
123
omap_usb2_phy_init(struct phy * usb_phy)124 static int omap_usb2_phy_init(struct phy *usb_phy)
125 {
126 struct udevice *dev = usb_phy->dev;
127 struct omap_usb2_phy *priv = dev_get_priv(dev);
128 u32 val;
129
130 if (priv->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
131 /*
132 *
133 * Reduce the sensitivity of internal PHY by enabling the
134 * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
135 * resolves issues with certain devices which can otherwise
136 * be prone to false disconnects.
137 *
138 */
139 val = readl(priv->phy_base + USB2PHY_ANA_CONFIG1);
140 val |= USB2PHY_DISCON_BYP_LATCH;
141 writel(val, priv->phy_base + USB2PHY_ANA_CONFIG1);
142 }
143
144 return 0;
145 }
146
omap_usb2_phy_power_on(struct phy * usb_phy)147 static int omap_usb2_phy_power_on(struct phy *usb_phy)
148 {
149 return omap_usb_phy_power(usb_phy, true);
150 }
151
omap_usb2_phy_power_off(struct phy * usb_phy)152 static int omap_usb2_phy_power_off(struct phy *usb_phy)
153 {
154 return omap_usb_phy_power(usb_phy, false);
155 }
156
omap_usb2_phy_exit(struct phy * usb_phy)157 static int omap_usb2_phy_exit(struct phy *usb_phy)
158 {
159 return omap_usb_phy_power(usb_phy, false);
160 }
161
162 struct phy_ops omap_usb2_phy_ops = {
163 .init = omap_usb2_phy_init,
164 .power_on = omap_usb2_phy_power_on,
165 .power_off = omap_usb2_phy_power_off,
166 .exit = omap_usb2_phy_exit,
167 };
168
omap_usb2_phy_probe(struct udevice * dev)169 int omap_usb2_phy_probe(struct udevice *dev)
170 {
171 int rc;
172 struct regmap *regmap;
173 struct omap_usb2_phy *priv = dev_get_priv(dev);
174 const struct usb_phy_data *data;
175 u32 tmp[2];
176
177 data = (const struct usb_phy_data *)dev_get_driver_data(dev);
178 if (!data)
179 return -EINVAL;
180
181 if (data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
182 u32 base = dev_read_addr(dev);
183
184 if (base == FDT_ADDR_T_NONE)
185 return -EINVAL;
186 priv->phy_base = (void *)base;
187 priv->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
188 }
189
190 regmap = syscon_regmap_lookup_by_phandle(dev, "syscon-phy-power");
191 if (!IS_ERR(regmap)) {
192 priv->pwr_regmap = regmap;
193 rc = dev_read_u32_array(dev, "syscon-phy-power", tmp, 2);
194 if (rc) {
195 printf("couldn't get power reg. offset (err %d)\n", rc);
196 return rc;
197 }
198 priv->pwr_reg_offset = tmp[1];
199 return 0;
200 }
201 regmap = syscon_regmap_lookup_by_phandle(dev, "ctrl-module");
202 if (!IS_ERR(regmap)) {
203 priv->pwr_regmap = regmap;
204 priv->pwr_reg_offset = 0;
205 return 0;
206 }
207
208 printf("can't get regmap (err %ld)\n", PTR_ERR(regmap));
209 return PTR_ERR(regmap);
210 }
211
212 U_BOOT_DRIVER(omap_usb2_phy) = {
213 .name = "omap_usb2_phy",
214 .id = UCLASS_PHY,
215 .of_match = omap_usb2_id_table,
216 .probe = omap_usb2_phy_probe,
217 .ops = &omap_usb2_phy_ops,
218 .priv_auto_alloc_size = sizeof(struct omap_usb2_phy),
219 };
220