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5#include <linux/module.h>
6#include <linux/ulpi/driver.h>
7#include <linux/ulpi/regs.h>
8#include <linux/clk.h>
9#include <linux/regulator/consumer.h>
10#include <linux/of_device.h>
11#include <linux/phy/phy.h>
12#include <linux/reset.h>
13#include <linux/extcon.h>
14#include <linux/notifier.h>
15
16#define ULPI_PWR_CLK_MNG_REG 0x88
17# define ULPI_PWR_OTG_COMP_DISABLE BIT(0)
18
19#define ULPI_MISC_A 0x96
20# define ULPI_MISC_A_VBUSVLDEXTSEL BIT(1)
21# define ULPI_MISC_A_VBUSVLDEXT BIT(0)
22
23
24struct ulpi_seq {
25 u8 addr;
26 u8 val;
27};
28
29struct qcom_usb_hs_phy {
30 struct ulpi *ulpi;
31 struct phy *phy;
32 struct clk *ref_clk;
33 struct clk *sleep_clk;
34 struct regulator *v1p8;
35 struct regulator *v3p3;
36 struct reset_control *reset;
37 struct ulpi_seq *init_seq;
38 struct extcon_dev *vbus_edev;
39 struct notifier_block vbus_notify;
40};
41
42static int qcom_usb_hs_phy_set_mode(struct phy *phy,
43 enum phy_mode mode, int submode)
44{
45 struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);
46 u8 addr;
47 int ret;
48
49 if (!uphy->vbus_edev) {
50 u8 val = 0;
51
52 switch (mode) {
53 case PHY_MODE_USB_OTG:
54 case PHY_MODE_USB_HOST:
55 val |= ULPI_INT_IDGRD;
56 fallthrough;
57 case PHY_MODE_USB_DEVICE:
58 val |= ULPI_INT_SESS_VALID;
59 break;
60 default:
61 break;
62 }
63
64 ret = ulpi_write(uphy->ulpi, ULPI_USB_INT_EN_RISE, val);
65 if (ret)
66 return ret;
67 ret = ulpi_write(uphy->ulpi, ULPI_USB_INT_EN_FALL, val);
68 } else {
69 switch (mode) {
70 case PHY_MODE_USB_OTG:
71 case PHY_MODE_USB_DEVICE:
72 addr = ULPI_SET(ULPI_MISC_A);
73 break;
74 case PHY_MODE_USB_HOST:
75 addr = ULPI_CLR(ULPI_MISC_A);
76 break;
77 default:
78 return -EINVAL;
79 }
80
81 ret = ulpi_write(uphy->ulpi, ULPI_SET(ULPI_PWR_CLK_MNG_REG),
82 ULPI_PWR_OTG_COMP_DISABLE);
83 if (ret)
84 return ret;
85 ret = ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXTSEL);
86 }
87
88 return ret;
89}
90
91static int
92qcom_usb_hs_phy_vbus_notifier(struct notifier_block *nb, unsigned long event,
93 void *ptr)
94{
95 struct qcom_usb_hs_phy *uphy;
96 u8 addr;
97
98 uphy = container_of(nb, struct qcom_usb_hs_phy, vbus_notify);
99
100 if (event)
101 addr = ULPI_SET(ULPI_MISC_A);
102 else
103 addr = ULPI_CLR(ULPI_MISC_A);
104
105 return ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXT);
106}
107
108static int qcom_usb_hs_phy_power_on(struct phy *phy)
109{
110 struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);
111 struct ulpi *ulpi = uphy->ulpi;
112 const struct ulpi_seq *seq;
113 int ret, state;
114
115 ret = clk_prepare_enable(uphy->ref_clk);
116 if (ret)
117 return ret;
118
119 ret = clk_prepare_enable(uphy->sleep_clk);
120 if (ret)
121 goto err_sleep;
122
123 ret = regulator_set_load(uphy->v1p8, 50000);
124 if (ret < 0)
125 goto err_1p8;
126
127 ret = regulator_enable(uphy->v1p8);
128 if (ret)
129 goto err_1p8;
130
131 ret = regulator_set_voltage_triplet(uphy->v3p3, 3050000, 3300000,
132 3300000);
133 if (ret)
134 goto err_3p3;
135
136 ret = regulator_set_load(uphy->v3p3, 50000);
137 if (ret < 0)
138 goto err_3p3;
139
140 ret = regulator_enable(uphy->v3p3);
141 if (ret)
142 goto err_3p3;
143
144 for (seq = uphy->init_seq; seq->addr; seq++) {
145 ret = ulpi_write(ulpi, ULPI_EXT_VENDOR_SPECIFIC + seq->addr,
146 seq->val);
147 if (ret)
148 goto err_ulpi;
149 }
150
151 if (uphy->reset) {
152 ret = reset_control_reset(uphy->reset);
153 if (ret)
154 goto err_ulpi;
155 }
156
157 if (uphy->vbus_edev) {
158 state = extcon_get_state(uphy->vbus_edev, EXTCON_USB);
159
160 qcom_usb_hs_phy_vbus_notifier(&uphy->vbus_notify, state,
161 uphy->vbus_edev);
162 ret = extcon_register_notifier(uphy->vbus_edev, EXTCON_USB,
163 &uphy->vbus_notify);
164 if (ret)
165 goto err_ulpi;
166 }
167
168 return 0;
169err_ulpi:
170 regulator_disable(uphy->v3p3);
171err_3p3:
172 regulator_disable(uphy->v1p8);
173err_1p8:
174 clk_disable_unprepare(uphy->sleep_clk);
175err_sleep:
176 clk_disable_unprepare(uphy->ref_clk);
177 return ret;
178}
179
180static int qcom_usb_hs_phy_power_off(struct phy *phy)
181{
182 struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);
183
184 if (uphy->vbus_edev)
185 extcon_unregister_notifier(uphy->vbus_edev, EXTCON_USB,
186 &uphy->vbus_notify);
187 regulator_disable(uphy->v3p3);
188 regulator_disable(uphy->v1p8);
189 clk_disable_unprepare(uphy->sleep_clk);
190 clk_disable_unprepare(uphy->ref_clk);
191
192 return 0;
193}
194
195static const struct phy_ops qcom_usb_hs_phy_ops = {
196 .power_on = qcom_usb_hs_phy_power_on,
197 .power_off = qcom_usb_hs_phy_power_off,
198 .set_mode = qcom_usb_hs_phy_set_mode,
199 .owner = THIS_MODULE,
200};
201
202static int qcom_usb_hs_phy_probe(struct ulpi *ulpi)
203{
204 struct qcom_usb_hs_phy *uphy;
205 struct phy_provider *p;
206 struct clk *clk;
207 struct regulator *reg;
208 struct reset_control *reset;
209 int size;
210 int ret;
211
212 uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
213 if (!uphy)
214 return -ENOMEM;
215 ulpi_set_drvdata(ulpi, uphy);
216 uphy->ulpi = ulpi;
217
218 size = of_property_count_u8_elems(ulpi->dev.of_node, "qcom,init-seq");
219 if (size < 0)
220 size = 0;
221 uphy->init_seq = devm_kmalloc_array(&ulpi->dev, (size / 2) + 1,
222 sizeof(*uphy->init_seq), GFP_KERNEL);
223 if (!uphy->init_seq)
224 return -ENOMEM;
225 ret = of_property_read_u8_array(ulpi->dev.of_node, "qcom,init-seq",
226 (u8 *)uphy->init_seq, size);
227 if (ret && size)
228 return ret;
229
230 uphy->init_seq[size / 2].addr = uphy->init_seq[size / 2].val = 0;
231
232 uphy->ref_clk = clk = devm_clk_get(&ulpi->dev, "ref");
233 if (IS_ERR(clk))
234 return PTR_ERR(clk);
235
236 uphy->sleep_clk = clk = devm_clk_get(&ulpi->dev, "sleep");
237 if (IS_ERR(clk))
238 return PTR_ERR(clk);
239
240 uphy->v1p8 = reg = devm_regulator_get(&ulpi->dev, "v1p8");
241 if (IS_ERR(reg))
242 return PTR_ERR(reg);
243
244 uphy->v3p3 = reg = devm_regulator_get(&ulpi->dev, "v3p3");
245 if (IS_ERR(reg))
246 return PTR_ERR(reg);
247
248 uphy->reset = reset = devm_reset_control_get(&ulpi->dev, "por");
249 if (IS_ERR(reset)) {
250 if (PTR_ERR(reset) == -EPROBE_DEFER)
251 return PTR_ERR(reset);
252 uphy->reset = NULL;
253 }
254
255 uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
256 &qcom_usb_hs_phy_ops);
257 if (IS_ERR(uphy->phy))
258 return PTR_ERR(uphy->phy);
259
260 uphy->vbus_edev = extcon_get_edev_by_phandle(&ulpi->dev, 0);
261 if (IS_ERR(uphy->vbus_edev)) {
262 if (PTR_ERR(uphy->vbus_edev) != -ENODEV)
263 return PTR_ERR(uphy->vbus_edev);
264 uphy->vbus_edev = NULL;
265 }
266
267 uphy->vbus_notify.notifier_call = qcom_usb_hs_phy_vbus_notifier;
268 phy_set_drvdata(uphy->phy, uphy);
269
270 p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
271 return PTR_ERR_OR_ZERO(p);
272}
273
274static const struct of_device_id qcom_usb_hs_phy_match[] = {
275 { .compatible = "qcom,usb-hs-phy", },
276 { }
277};
278MODULE_DEVICE_TABLE(of, qcom_usb_hs_phy_match);
279
280static struct ulpi_driver qcom_usb_hs_phy_driver = {
281 .probe = qcom_usb_hs_phy_probe,
282 .driver = {
283 .name = "qcom_usb_hs_phy",
284 .of_match_table = qcom_usb_hs_phy_match,
285 },
286};
287module_ulpi_driver(qcom_usb_hs_phy_driver);
288
289MODULE_DESCRIPTION("Qualcomm USB HS phy");
290MODULE_LICENSE("GPL v2");
291
