1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Meson GXL and GXM USB2 PHY driver
4 *
5 * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
6 * Copyright (C) 2018 BayLibre, SAS
7 * Author: Neil Armstrong <narmstron@baylibre.com>
8 */
9
10 #include <common.h>
11 #include <malloc.h>
12 #include <asm/io.h>
13 #include <bitfield.h>
14 #include <dm.h>
15 #include <errno.h>
16 #include <generic-phy.h>
17 #include <regmap.h>
18 #include <linux/delay.h>
19 #include <power/regulator.h>
20 #include <clk.h>
21 #include <linux/usb/otg.h>
22
23 #include <asm/arch/usb-gx.h>
24
25 #include <linux/bitops.h>
26 #include <linux/compat.h>
27
28 /* bits [31:27] are read-only */
29 #define U2P_R0 0x0
30 #define U2P_R0_BYPASS_SEL BIT(0)
31 #define U2P_R0_BYPASS_DM_EN BIT(1)
32 #define U2P_R0_BYPASS_DP_EN BIT(2)
33 #define U2P_R0_TXBITSTUFF_ENH BIT(3)
34 #define U2P_R0_TXBITSTUFF_EN BIT(4)
35 #define U2P_R0_DM_PULLDOWN BIT(5)
36 #define U2P_R0_DP_PULLDOWN BIT(6)
37 #define U2P_R0_DP_VBUS_VLD_EXT_SEL BIT(7)
38 #define U2P_R0_DP_VBUS_VLD_EXT BIT(8)
39 #define U2P_R0_ADP_PRB_EN BIT(9)
40 #define U2P_R0_ADP_DISCHARGE BIT(10)
41 #define U2P_R0_ADP_CHARGE BIT(11)
42 #define U2P_R0_DRV_VBUS BIT(12)
43 #define U2P_R0_ID_PULLUP BIT(13)
44 #define U2P_R0_LOOPBACK_EN_B BIT(14)
45 #define U2P_R0_OTG_DISABLE BIT(15)
46 #define U2P_R0_COMMON_ONN BIT(16)
47 #define U2P_R0_FSEL_MASK GENMASK(19, 17)
48 #define U2P_R0_REF_CLK_SEL_MASK GENMASK(21, 20)
49 #define U2P_R0_POWER_ON_RESET BIT(22)
50 #define U2P_R0_V_ATE_TEST_EN_B_MASK GENMASK(24, 23)
51 #define U2P_R0_ID_SET_ID_DQ BIT(25)
52 #define U2P_R0_ATE_RESET BIT(26)
53 #define U2P_R0_FSV_MINUS BIT(27)
54 #define U2P_R0_FSV_PLUS BIT(28)
55 #define U2P_R0_BYPASS_DM_DATA BIT(29)
56 #define U2P_R0_BYPASS_DP_DATA BIT(30)
57
58 #define U2P_R1 0x4
59 #define U2P_R1_BURN_IN_TEST BIT(0)
60 #define U2P_R1_ACA_ENABLE BIT(1)
61 #define U2P_R1_DCD_ENABLE BIT(2)
62 #define U2P_R1_VDAT_SRC_EN_B BIT(3)
63 #define U2P_R1_VDAT_DET_EN_B BIT(4)
64 #define U2P_R1_CHARGES_SEL BIT(5)
65 #define U2P_R1_TX_PREEMP_PULSE_TUNE BIT(6)
66 #define U2P_R1_TX_PREEMP_AMP_TUNE_MASK GENMASK(8, 7)
67 #define U2P_R1_TX_RES_TUNE_MASK GENMASK(10, 9)
68 #define U2P_R1_TX_RISE_TUNE_MASK GENMASK(12, 11)
69 #define U2P_R1_TX_VREF_TUNE_MASK GENMASK(16, 13)
70 #define U2P_R1_TX_FSLS_TUNE_MASK GENMASK(20, 17)
71 #define U2P_R1_TX_HSXV_TUNE_MASK GENMASK(22, 21)
72 #define U2P_R1_OTG_TUNE_MASK GENMASK(25, 23)
73 #define U2P_R1_SQRX_TUNE_MASK GENMASK(28, 26)
74 #define U2P_R1_COMP_DIS_TUNE_MASK GENMASK(31, 29)
75
76 /* bits [31:14] are read-only */
77 #define U2P_R2 0x8
78 #define U2P_R2_TESTDATA_IN_MASK GENMASK(7, 0)
79 #define U2P_R2_TESTADDR_MASK GENMASK(11, 8)
80 #define U2P_R2_TESTDATA_OUT_SEL BIT(12)
81 #define U2P_R2_TESTCLK BIT(13)
82 #define U2P_R2_TESTDATA_OUT_MASK GENMASK(17, 14)
83 #define U2P_R2_ACA_PIN_RANGE_C BIT(18)
84 #define U2P_R2_ACA_PIN_RANGE_B BIT(19)
85 #define U2P_R2_ACA_PIN_RANGE_A BIT(20)
86 #define U2P_R2_ACA_PIN_GND BIT(21)
87 #define U2P_R2_ACA_PIN_FLOAT BIT(22)
88 #define U2P_R2_CHARGE_DETECT BIT(23)
89 #define U2P_R2_DEVICE_SESSION_VALID BIT(24)
90 #define U2P_R2_ADP_PROBE BIT(25)
91 #define U2P_R2_ADP_SENSE BIT(26)
92 #define U2P_R2_SESSION_END BIT(27)
93 #define U2P_R2_VBUS_VALID BIT(28)
94 #define U2P_R2_B_VALID BIT(29)
95 #define U2P_R2_A_VALID BIT(30)
96 #define U2P_R2_ID_DIG BIT(31)
97
98 #define U2P_R3 0xc
99
100 #define RESET_COMPLETE_TIME 500
101
102 struct phy_meson_gxl_usb2_priv {
103 struct regmap *regmap;
104 #if CONFIG_IS_ENABLED(DM_REGULATOR)
105 struct udevice *phy_supply;
106 #endif
107 #if CONFIG_IS_ENABLED(CLK)
108 struct clk clk;
109 #endif
110 };
111
phy_meson_gxl_usb2_reset(struct phy_meson_gxl_usb2_priv * priv)112 static void phy_meson_gxl_usb2_reset(struct phy_meson_gxl_usb2_priv *priv)
113 {
114 uint val;
115
116 regmap_read(priv->regmap, U2P_R0, &val);
117
118 /* reset the PHY and wait until settings are stabilized */
119 val |= U2P_R0_POWER_ON_RESET;
120 regmap_write(priv->regmap, U2P_R0, val);
121 udelay(RESET_COMPLETE_TIME);
122
123 val &= ~U2P_R0_POWER_ON_RESET;
124 regmap_write(priv->regmap, U2P_R0, val);
125 udelay(RESET_COMPLETE_TIME);
126 }
127
phy_meson_gxl_usb2_set_mode(struct phy * phy,enum usb_dr_mode mode)128 void phy_meson_gxl_usb2_set_mode(struct phy *phy, enum usb_dr_mode mode)
129 {
130 struct udevice *dev = phy->dev;
131 struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
132 uint val;
133
134 regmap_read(priv->regmap, U2P_R0, &val);
135
136 switch (mode) {
137 case USB_DR_MODE_UNKNOWN:
138 case USB_DR_MODE_HOST:
139 case USB_DR_MODE_OTG:
140 val |= U2P_R0_DM_PULLDOWN;
141 val |= U2P_R0_DP_PULLDOWN;
142 val &= ~U2P_R0_ID_PULLUP;
143 break;
144
145 case USB_DR_MODE_PERIPHERAL:
146 val &= ~U2P_R0_DM_PULLDOWN;
147 val &= ~U2P_R0_DP_PULLDOWN;
148 val |= U2P_R0_ID_PULLUP;
149 break;
150 }
151
152 regmap_write(priv->regmap, U2P_R0, val);
153
154 phy_meson_gxl_usb2_reset(priv);
155 }
156
phy_meson_gxl_usb2_power_on(struct phy * phy)157 static int phy_meson_gxl_usb2_power_on(struct phy *phy)
158 {
159 struct udevice *dev = phy->dev;
160 struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
161 uint val;
162
163 regmap_read(priv->regmap, U2P_R0, &val);
164 /* power on the PHY by taking it out of reset mode */
165 val &= ~U2P_R0_POWER_ON_RESET;
166 regmap_write(priv->regmap, U2P_R0, val);
167
168 phy_meson_gxl_usb2_set_mode(phy, USB_DR_MODE_HOST);
169
170 #if CONFIG_IS_ENABLED(DM_REGULATOR)
171 if (priv->phy_supply) {
172 int ret = regulator_set_enable(priv->phy_supply, true);
173 if (ret)
174 return ret;
175 }
176 #endif
177
178 return 0;
179 }
180
phy_meson_gxl_usb2_power_off(struct phy * phy)181 static int phy_meson_gxl_usb2_power_off(struct phy *phy)
182 {
183 struct udevice *dev = phy->dev;
184 struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
185 uint val;
186
187 regmap_read(priv->regmap, U2P_R0, &val);
188 /* power off the PHY by putting it into reset mode */
189 val |= U2P_R0_POWER_ON_RESET;
190 regmap_write(priv->regmap, U2P_R0, val);
191
192 #if CONFIG_IS_ENABLED(DM_REGULATOR)
193 if (priv->phy_supply) {
194 int ret = regulator_set_enable(priv->phy_supply, false);
195 if (ret) {
196 pr_err("Error disabling PHY supply\n");
197 return ret;
198 }
199 }
200 #endif
201
202 return 0;
203 }
204
205 struct phy_ops meson_gxl_usb2_phy_ops = {
206 .power_on = phy_meson_gxl_usb2_power_on,
207 .power_off = phy_meson_gxl_usb2_power_off,
208 };
209
meson_gxl_usb2_phy_probe(struct udevice * dev)210 int meson_gxl_usb2_phy_probe(struct udevice *dev)
211 {
212 struct phy_meson_gxl_usb2_priv *priv = dev_get_priv(dev);
213 int ret;
214
215 ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
216 if (ret)
217 return ret;
218
219 #if CONFIG_IS_ENABLED(CLK)
220 ret = clk_get_by_index(dev, 0, &priv->clk);
221 if (ret < 0)
222 return ret;
223
224 ret = clk_enable(&priv->clk);
225 if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
226 pr_err("failed to enable PHY clock\n");
227 clk_free(&priv->clk);
228 return ret;
229 }
230 #endif
231
232 #if CONFIG_IS_ENABLED(DM_REGULATOR)
233 ret = device_get_supply_regulator(dev, "phy-supply", &priv->phy_supply);
234 if (ret && ret != -ENOENT) {
235 pr_err("Failed to get PHY regulator\n");
236 return ret;
237 }
238 #endif
239
240 return 0;
241 }
242
243 static const struct udevice_id meson_gxl_usb2_phy_ids[] = {
244 { .compatible = "amlogic,meson-gxl-usb2-phy" },
245 { }
246 };
247
248 U_BOOT_DRIVER(meson_gxl_usb2_phy) = {
249 .name = "meson_gxl_usb2_phy",
250 .id = UCLASS_PHY,
251 .of_match = meson_gxl_usb2_phy_ids,
252 .probe = meson_gxl_usb2_phy_probe,
253 .ops = &meson_gxl_usb2_phy_ops,
254 .priv_auto = sizeof(struct phy_meson_gxl_usb2_priv),
255 };
256