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14#include <linux/clk.h>
15#include <linux/delay.h>
16#include <linux/io.h>
17#include <linux/module.h>
18#include <linux/of_device.h>
19#include <linux/reset.h>
20#include <linux/phy/phy.h>
21#include <linux/platform_device.h>
22#include <linux/usb/of.h>
23
24#define REG_CONFIG 0x00
25 #define REG_CONFIG_CLK_EN BIT(0)
26 #define REG_CONFIG_CLK_SEL_MASK GENMASK(3, 1)
27 #define REG_CONFIG_CLK_DIV_MASK GENMASK(10, 4)
28 #define REG_CONFIG_CLK_32k_ALTSEL BIT(15)
29 #define REG_CONFIG_TEST_TRIG BIT(31)
30
31#define REG_CTRL 0x04
32 #define REG_CTRL_SOFT_PRST BIT(0)
33 #define REG_CTRL_SOFT_HRESET BIT(1)
34 #define REG_CTRL_SS_SCALEDOWN_MODE_MASK GENMASK(3, 2)
35 #define REG_CTRL_CLK_DET_RST BIT(4)
36 #define REG_CTRL_INTR_SEL BIT(5)
37 #define REG_CTRL_CLK_DETECTED BIT(8)
38 #define REG_CTRL_SOF_SENT_RCVD_TGL BIT(9)
39 #define REG_CTRL_SOF_TOGGLE_OUT BIT(10)
40 #define REG_CTRL_POWER_ON_RESET BIT(15)
41 #define REG_CTRL_SLEEPM BIT(16)
42 #define REG_CTRL_TX_BITSTUFF_ENN_H BIT(17)
43 #define REG_CTRL_TX_BITSTUFF_ENN BIT(18)
44 #define REG_CTRL_COMMON_ON BIT(19)
45 #define REG_CTRL_REF_CLK_SEL_MASK GENMASK(21, 20)
46 #define REG_CTRL_REF_CLK_SEL_SHIFT 20
47 #define REG_CTRL_FSEL_MASK GENMASK(24, 22)
48 #define REG_CTRL_FSEL_SHIFT 22
49 #define REG_CTRL_PORT_RESET BIT(25)
50 #define REG_CTRL_THREAD_ID_MASK GENMASK(31, 26)
51
52#define REG_ENDP_INTR 0x08
53
54
55#define REG_ADP_BC 0x0c
56 #define REG_ADP_BC_VBUS_VLD_EXT_SEL BIT(0)
57 #define REG_ADP_BC_VBUS_VLD_EXT BIT(1)
58 #define REG_ADP_BC_OTG_DISABLE BIT(2)
59 #define REG_ADP_BC_ID_PULLUP BIT(3)
60 #define REG_ADP_BC_DRV_VBUS BIT(4)
61 #define REG_ADP_BC_ADP_PRB_EN BIT(5)
62 #define REG_ADP_BC_ADP_DISCHARGE BIT(6)
63 #define REG_ADP_BC_ADP_CHARGE BIT(7)
64 #define REG_ADP_BC_SESS_END BIT(8)
65 #define REG_ADP_BC_DEVICE_SESS_VLD BIT(9)
66 #define REG_ADP_BC_B_VALID BIT(10)
67 #define REG_ADP_BC_A_VALID BIT(11)
68 #define REG_ADP_BC_ID_DIG BIT(12)
69 #define REG_ADP_BC_VBUS_VALID BIT(13)
70 #define REG_ADP_BC_ADP_PROBE BIT(14)
71 #define REG_ADP_BC_ADP_SENSE BIT(15)
72 #define REG_ADP_BC_ACA_ENABLE BIT(16)
73 #define REG_ADP_BC_DCD_ENABLE BIT(17)
74 #define REG_ADP_BC_VDAT_DET_EN_B BIT(18)
75 #define REG_ADP_BC_VDAT_SRC_EN_B BIT(19)
76 #define REG_ADP_BC_CHARGE_SEL BIT(20)
77 #define REG_ADP_BC_CHARGE_DETECT BIT(21)
78 #define REG_ADP_BC_ACA_PIN_RANGE_C BIT(22)
79 #define REG_ADP_BC_ACA_PIN_RANGE_B BIT(23)
80 #define REG_ADP_BC_ACA_PIN_RANGE_A BIT(24)
81 #define REG_ADP_BC_ACA_PIN_GND BIT(25)
82 #define REG_ADP_BC_ACA_PIN_FLOAT BIT(26)
83
84#define REG_DBG_UART 0x10
85
86#define REG_TEST 0x14
87 #define REG_TEST_DATA_IN_MASK GENMASK(3, 0)
88 #define REG_TEST_EN_MASK GENMASK(7, 4)
89 #define REG_TEST_ADDR_MASK GENMASK(11, 8)
90 #define REG_TEST_DATA_OUT_SEL BIT(12)
91 #define REG_TEST_CLK BIT(13)
92 #define REG_TEST_VA_TEST_EN_B_MASK GENMASK(15, 14)
93 #define REG_TEST_DATA_OUT_MASK GENMASK(19, 16)
94 #define REG_TEST_DISABLE_ID_PULLUP BIT(20)
95
96#define REG_TUNE 0x18
97 #define REG_TUNE_TX_RES_TUNE_MASK GENMASK(1, 0)
98 #define REG_TUNE_TX_HSXV_TUNE_MASK GENMASK(3, 2)
99 #define REG_TUNE_TX_VREF_TUNE_MASK GENMASK(7, 4)
100 #define REG_TUNE_TX_RISE_TUNE_MASK GENMASK(9, 8)
101 #define REG_TUNE_TX_PREEMP_PULSE_TUNE BIT(10)
102 #define REG_TUNE_TX_PREEMP_AMP_TUNE_MASK GENMASK(12, 11)
103 #define REG_TUNE_TX_FSLS_TUNE_MASK GENMASK(16, 13)
104 #define REG_TUNE_SQRX_TUNE_MASK GENMASK(19, 17)
105 #define REG_TUNE_OTG_TUNE GENMASK(22, 20)
106 #define REG_TUNE_COMP_DIS_TUNE GENMASK(25, 23)
107 #define REG_TUNE_HOST_DM_PULLDOWN BIT(26)
108 #define REG_TUNE_HOST_DP_PULLDOWN BIT(27)
109
110#define RESET_COMPLETE_TIME 500
111#define ACA_ENABLE_COMPLETE_TIME 50
112
113struct phy_meson8b_usb2_priv {
114 void __iomem *regs;
115 enum usb_dr_mode dr_mode;
116 struct clk *clk_usb_general;
117 struct clk *clk_usb;
118 struct reset_control *reset;
119};
120
121static u32 phy_meson8b_usb2_read(struct phy_meson8b_usb2_priv *phy_priv,
122 u32 reg)
123{
124 return readl(phy_priv->regs + reg);
125}
126
127static void phy_meson8b_usb2_mask_bits(struct phy_meson8b_usb2_priv *phy_priv,
128 u32 reg, u32 mask, u32 value)
129{
130 u32 data;
131
132 data = phy_meson8b_usb2_read(phy_priv, reg);
133 data &= ~mask;
134 data |= (value & mask);
135
136 writel(data, phy_priv->regs + reg);
137}
138
139static int phy_meson8b_usb2_power_on(struct phy *phy)
140{
141 struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
142 int ret;
143
144 if (!IS_ERR_OR_NULL(priv->reset)) {
145 ret = reset_control_reset(priv->reset);
146 if (ret) {
147 dev_err(&phy->dev, "Failed to trigger USB reset\n");
148 return ret;
149 }
150 }
151
152 ret = clk_prepare_enable(priv->clk_usb_general);
153 if (ret) {
154 dev_err(&phy->dev, "Failed to enable USB general clock\n");
155 return ret;
156 }
157
158 ret = clk_prepare_enable(priv->clk_usb);
159 if (ret) {
160 dev_err(&phy->dev, "Failed to enable USB DDR clock\n");
161 clk_disable_unprepare(priv->clk_usb_general);
162 return ret;
163 }
164
165 phy_meson8b_usb2_mask_bits(priv, REG_CONFIG, REG_CONFIG_CLK_32k_ALTSEL,
166 REG_CONFIG_CLK_32k_ALTSEL);
167
168 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_REF_CLK_SEL_MASK,
169 0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
170
171 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_FSEL_MASK,
172 0x5 << REG_CTRL_FSEL_SHIFT);
173
174
175 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET,
176 REG_CTRL_POWER_ON_RESET);
177 udelay(RESET_COMPLETE_TIME);
178 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_POWER_ON_RESET, 0);
179 udelay(RESET_COMPLETE_TIME);
180
181 phy_meson8b_usb2_mask_bits(priv, REG_CTRL, REG_CTRL_SOF_TOGGLE_OUT,
182 REG_CTRL_SOF_TOGGLE_OUT);
183
184 if (priv->dr_mode == USB_DR_MODE_HOST) {
185 phy_meson8b_usb2_mask_bits(priv, REG_ADP_BC,
186 REG_ADP_BC_ACA_ENABLE,
187 REG_ADP_BC_ACA_ENABLE);
188
189 udelay(ACA_ENABLE_COMPLETE_TIME);
190
191 if (phy_meson8b_usb2_read(priv, REG_ADP_BC) &
192 REG_ADP_BC_ACA_PIN_FLOAT) {
193 dev_warn(&phy->dev, "USB ID detect failed!\n");
194 clk_disable_unprepare(priv->clk_usb);
195 clk_disable_unprepare(priv->clk_usb_general);
196 return -EINVAL;
197 }
198 }
199
200 return 0;
201}
202
203static int phy_meson8b_usb2_power_off(struct phy *phy)
204{
205 struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
206
207 clk_disable_unprepare(priv->clk_usb);
208 clk_disable_unprepare(priv->clk_usb_general);
209
210 return 0;
211}
212
213static const struct phy_ops phy_meson8b_usb2_ops = {
214 .power_on = phy_meson8b_usb2_power_on,
215 .power_off = phy_meson8b_usb2_power_off,
216 .owner = THIS_MODULE,
217};
218
219static int phy_meson8b_usb2_probe(struct platform_device *pdev)
220{
221 struct phy_meson8b_usb2_priv *priv;
222 struct resource *res;
223 struct phy *phy;
224 struct phy_provider *phy_provider;
225
226 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
227 if (!priv)
228 return -ENOMEM;
229
230 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
231 priv->regs = devm_ioremap_resource(&pdev->dev, res);
232 if (IS_ERR(priv->regs))
233 return PTR_ERR(priv->regs);
234
235 priv->clk_usb_general = devm_clk_get(&pdev->dev, "usb_general");
236 if (IS_ERR(priv->clk_usb_general))
237 return PTR_ERR(priv->clk_usb_general);
238
239 priv->clk_usb = devm_clk_get(&pdev->dev, "usb");
240 if (IS_ERR(priv->clk_usb))
241 return PTR_ERR(priv->clk_usb);
242
243 priv->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
244 if (PTR_ERR(priv->reset) == -EPROBE_DEFER)
245 return PTR_ERR(priv->reset);
246
247 priv->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
248 if (priv->dr_mode == USB_DR_MODE_UNKNOWN) {
249 dev_err(&pdev->dev,
250 "missing dual role configuration of the controller\n");
251 return -EINVAL;
252 }
253
254 phy = devm_phy_create(&pdev->dev, NULL, &phy_meson8b_usb2_ops);
255 if (IS_ERR(phy)) {
256 dev_err(&pdev->dev, "failed to create PHY\n");
257 return PTR_ERR(phy);
258 }
259
260 phy_set_drvdata(phy, priv);
261
262 phy_provider =
263 devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
264
265 return PTR_ERR_OR_ZERO(phy_provider);
266}
267
268static const struct of_device_id phy_meson8b_usb2_of_match[] = {
269 { .compatible = "amlogic,meson8-usb2-phy", },
270 { .compatible = "amlogic,meson8b-usb2-phy", },
271 { .compatible = "amlogic,meson-gxbb-usb2-phy", },
272 { },
273};
274MODULE_DEVICE_TABLE(of, phy_meson8b_usb2_of_match);
275
276static struct platform_driver phy_meson8b_usb2_driver = {
277 .probe = phy_meson8b_usb2_probe,
278 .driver = {
279 .name = "phy-meson-usb2",
280 .of_match_table = phy_meson8b_usb2_of_match,
281 },
282};
283module_platform_driver(phy_meson8b_usb2_driver);
284
285MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
286MODULE_DESCRIPTION("Meson8, Meson8b and GXBB USB2 PHY driver");
287MODULE_LICENSE("GPL");
288
