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8#include <linux/clk.h>
9#include <linux/delay.h>
10#include <linux/io.h>
11#include <linux/module.h>
12#include <linux/of_device.h>
13#include <linux/reset.h>
14#include <linux/phy/phy.h>
15#include <linux/platform_device.h>
16#include <linux/usb/of.h>
17
18#define REG_CONFIG 0x00
19 #define REG_CONFIG_CLK_EN BIT(0)
20 #define REG_CONFIG_CLK_SEL_MASK GENMASK(3, 1)
21 #define REG_CONFIG_CLK_DIV_MASK GENMASK(10, 4)
22 #define REG_CONFIG_CLK_32k_ALTSEL BIT(15)
23 #define REG_CONFIG_TEST_TRIG BIT(31)
24
25#define REG_CTRL 0x04
26 #define REG_CTRL_SOFT_PRST BIT(0)
27 #define REG_CTRL_SOFT_HRESET BIT(1)
28 #define REG_CTRL_SS_SCALEDOWN_MODE_MASK GENMASK(3, 2)
29 #define REG_CTRL_CLK_DET_RST BIT(4)
30 #define REG_CTRL_INTR_SEL BIT(5)
31 #define REG_CTRL_CLK_DETECTED BIT(8)
32 #define REG_CTRL_SOF_SENT_RCVD_TGL BIT(9)
33 #define REG_CTRL_SOF_TOGGLE_OUT BIT(10)
34 #define REG_CTRL_POWER_ON_RESET BIT(15)
35 #define REG_CTRL_SLEEPM BIT(16)
36 #define REG_CTRL_TX_BITSTUFF_ENN_H BIT(17)
37 #define REG_CTRL_TX_BITSTUFF_ENN BIT(18)
38 #define REG_CTRL_COMMON_ON BIT(19)
39 #define REG_CTRL_REF_CLK_SEL_MASK GENMASK(21, 20)
40 #define REG_CTRL_REF_CLK_SEL_SHIFT 20
41 #define REG_CTRL_FSEL_MASK GENMASK(24, 22)
42 #define REG_CTRL_FSEL_SHIFT 22
43 #define REG_CTRL_PORT_RESET BIT(25)
44 #define REG_CTRL_THREAD_ID_MASK GENMASK(31, 26)
45
46#define REG_ENDP_INTR 0x08
47
48
49#define REG_ADP_BC 0x0c
50 #define REG_ADP_BC_VBUS_VLD_EXT_SEL BIT(0)
51 #define REG_ADP_BC_VBUS_VLD_EXT BIT(1)
52 #define REG_ADP_BC_OTG_DISABLE BIT(2)
53 #define REG_ADP_BC_ID_PULLUP BIT(3)
54 #define REG_ADP_BC_DRV_VBUS BIT(4)
55 #define REG_ADP_BC_ADP_PRB_EN BIT(5)
56 #define REG_ADP_BC_ADP_DISCHARGE BIT(6)
57 #define REG_ADP_BC_ADP_CHARGE BIT(7)
58 #define REG_ADP_BC_SESS_END BIT(8)
59 #define REG_ADP_BC_DEVICE_SESS_VLD BIT(9)
60 #define REG_ADP_BC_B_VALID BIT(10)
61 #define REG_ADP_BC_A_VALID BIT(11)
62 #define REG_ADP_BC_ID_DIG BIT(12)
63 #define REG_ADP_BC_VBUS_VALID BIT(13)
64 #define REG_ADP_BC_ADP_PROBE BIT(14)
65 #define REG_ADP_BC_ADP_SENSE BIT(15)
66 #define REG_ADP_BC_ACA_ENABLE BIT(16)
67 #define REG_ADP_BC_DCD_ENABLE BIT(17)
68 #define REG_ADP_BC_VDAT_DET_EN_B BIT(18)
69 #define REG_ADP_BC_VDAT_SRC_EN_B BIT(19)
70 #define REG_ADP_BC_CHARGE_SEL BIT(20)
71 #define REG_ADP_BC_CHARGE_DETECT BIT(21)
72 #define REG_ADP_BC_ACA_PIN_RANGE_C BIT(22)
73 #define REG_ADP_BC_ACA_PIN_RANGE_B BIT(23)
74 #define REG_ADP_BC_ACA_PIN_RANGE_A BIT(24)
75 #define REG_ADP_BC_ACA_PIN_GND BIT(25)
76 #define REG_ADP_BC_ACA_PIN_FLOAT BIT(26)
77
78#define REG_DBG_UART 0x10
79
80#define REG_TEST 0x14
81 #define REG_TEST_DATA_IN_MASK GENMASK(3, 0)
82 #define REG_TEST_EN_MASK GENMASK(7, 4)
83 #define REG_TEST_ADDR_MASK GENMASK(11, 8)
84 #define REG_TEST_DATA_OUT_SEL BIT(12)
85 #define REG_TEST_CLK BIT(13)
86 #define REG_TEST_VA_TEST_EN_B_MASK GENMASK(15, 14)
87 #define REG_TEST_DATA_OUT_MASK GENMASK(19, 16)
88 #define REG_TEST_DISABLE_ID_PULLUP BIT(20)
89
90#define REG_TUNE 0x18
91 #define REG_TUNE_TX_RES_TUNE_MASK GENMASK(1, 0)
92 #define REG_TUNE_TX_HSXV_TUNE_MASK GENMASK(3, 2)
93 #define REG_TUNE_TX_VREF_TUNE_MASK GENMASK(7, 4)
94 #define REG_TUNE_TX_RISE_TUNE_MASK GENMASK(9, 8)
95 #define REG_TUNE_TX_PREEMP_PULSE_TUNE BIT(10)
96 #define REG_TUNE_TX_PREEMP_AMP_TUNE_MASK GENMASK(12, 11)
97 #define REG_TUNE_TX_FSLS_TUNE_MASK GENMASK(16, 13)
98 #define REG_TUNE_SQRX_TUNE_MASK GENMASK(19, 17)
99 #define REG_TUNE_OTG_TUNE GENMASK(22, 20)
100 #define REG_TUNE_COMP_DIS_TUNE GENMASK(25, 23)
101 #define REG_TUNE_HOST_DM_PULLDOWN BIT(26)
102 #define REG_TUNE_HOST_DP_PULLDOWN BIT(27)
103
104#define RESET_COMPLETE_TIME 500
105#define ACA_ENABLE_COMPLETE_TIME 50
106
107struct phy_meson8b_usb2_priv {
108 void __iomem *regs;
109 enum usb_dr_mode dr_mode;
110 struct clk *clk_usb_general;
111 struct clk *clk_usb;
112 struct reset_control *reset;
113};
114
115static u32 phy_meson8b_usb2_read(struct phy_meson8b_usb2_priv *phy_priv,
116 u32 reg)
117{
118 return readl(phy_priv->regs + reg);
119}
120
121static void phy_meson8b_usb2_mask_bits(struct phy_meson8b_usb2_priv *phy_priv,
122 u32 reg, u32 mask, u32 value)
123{
124 u32 data;
125
126 data = phy_meson8b_usb2_read(phy_priv, reg);
127 data &= ~mask;
128 data |= (value & mask);
129
130 writel(data, phy_priv->regs + reg);
131}
132
133static int phy_meson8b_usb2_power_on(struct phy *phy)
134{
135 struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
136 int ret;
137
138 if (!IS_ERR_OR_NULL(priv->reset)) {
139 ret = reset_control_reset(priv->reset);
140 if (ret) {
141 dev_err(&phy->dev, "Failed to trigger USB reset\n");
142 return ret;
143 }
144 }
145
146 ret = clk_prepare_enable(priv->clk_usb_general);
147 if (ret) {
148 dev_err(&phy->dev, "Failed to enable USB general clock\n");
149 return ret;
150 }
151
152 ret = clk_prepare_enable(priv->clk_usb);
153 if (ret) {
154 dev_err(&phy->dev, "Failed to enable USB DDR clock\n");
155 clk_disable_unprepare(priv->clk_usb_general);
156 return ret;
157 }
158
159 phy_meson8b_usb2_mask_bits(priv, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,
160 REG_CONFIG_CLK_32k_ALTSEL);
161
162 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,
163 0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
164
165 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_FSEL_MASK,
166 0x5 << REG_CTRL_FSEL_SHIFT);
167
168
169 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET,
170 REG_CTRL_POWER_ON_RESET);
171 udelay(RESET_COMPLETE_TIME);
172 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);
173 udelay(RESET_COMPLETE_TIME);
174
175 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
176 REG_CTRL_SOF_TOGGLE_OUT);
177
178 if (priv->dr_mode == USB_DR_MODE_HOST) {
179 phy_meson8b_usb2_mask_bits(priv, REG_ADP_BC,
180 REG_ADP_BC_ACA_ENABLE,
181 REG_ADP_BC_ACA_ENABLE);
182
183 udelay(ACA_ENABLE_COMPLETE_TIME);
184
185 if (phy_meson8b_usb2_read(priv, REG_ADP_BC) &
186 REG_ADP_BC_ACA_PIN_FLOAT) {
187 dev_warn(&phy->dev, "USB ID detect failed!\n");
188 clk_disable_unprepare(priv->clk_usb);
189 clk_disable_unprepare(priv->clk_usb_general);
190 return -EINVAL;
191 }
192 }
193
194 return 0;
195}
196
197static int phy_meson8b_usb2_power_off(struct phy *phy)
198{
199 struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
200
201 clk_disable_unprepare(priv->clk_usb);
202 clk_disable_unprepare(priv->clk_usb_general);
203
204 return 0;
205}
206
207static const struct phy_ops phy_meson8b_usb2_ops = {
208 .power_on = phy_meson8b_usb2_power_on,
209 .power_off = phy_meson8b_usb2_power_off,
210 .owner = THIS_MODULE,
211};
212
213static int phy_meson8b_usb2_probe(struct platform_device *pdev)
214{
215 struct phy_meson8b_usb2_priv *priv;
216 struct resource *res;
217 struct phy *phy;
218 struct phy_provider *phy_provider;
219
220 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
221 if (!priv)
222 return -ENOMEM;
223
224 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
225 priv->regs = devm_ioremap_resource(&pdev->dev, res);
226 if (IS_ERR(priv->regs))
227 return PTR_ERR(priv->regs);
228
229 priv->clk_usb_general = devm_clk_get(&pdev->dev, "usb_general");
230 if (IS_ERR(priv->clk_usb_general))
231 return PTR_ERR(priv->clk_usb_general);
232
233 priv->clk_usb = devm_clk_get(&pdev->dev, "usb");
234 if (IS_ERR(priv->clk_usb))
235 return PTR_ERR(priv->clk_usb);
236
237 priv->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
238 if (PTR_ERR(priv->reset) == -EPROBE_DEFER)
239 return PTR_ERR(priv->reset);
240
241 priv->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
242 if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
243 dev_err(&pdev->dev,
244 "missing dual role configuration of the controller\n");
245 return -EINVAL;
246 }
247
248 phy = devm_phy_create(&pdev->dev, NULL, &phy_meson8b_usb2_ops);
249 if (IS_ERR(phy)) {
250 dev_err(&pdev->dev, "failed to create PHY\n");
251 return PTR_ERR(phy);
252 }
253
254 phy_set_drvdata(phy, priv);
255
256 phy_provider =
257 devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
258
259 return PTR_ERR_OR_ZERO(phy_provider);
260}
261
262static const struct of_device_id phy_meson8b_usb2_of_match[] = {
263 { .compatible = "amlogic,meson8-usb2-phy", },
264 { .compatible = "amlogic,meson8b-usb2-phy", },
265 { .compatible = "amlogic,meson-gxbb-usb2-phy", },
266 { },
267};
268MODULE_DEVICE_TABLE(of, phy_meson8b_usb2_of_match);
269
270static struct platform_driver phy_meson8b_usb2_driver = {
271 .probe = phy_meson8b_usb2_probe,
272 .driver = {
273 .name = "phy-meson-usb2",
274 .of_match_table = phy_meson8b_usb2_of_match,
275 },
276};
277module_platform_driver(phy_meson8b_usb2_driver);
278
279MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
280MODULE_DESCRIPTION("Meson8, Meson8b and GXBB USB2 PHY driver");
281MODULE_LICENSE("GPL");
282
