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10#include "mtu3.h"
11#include "mtu3_dr.h"
12#include "mtu3_debug.h"
13
14#define USB2_PORT 2
15#define USB3_PORT 3
16
17static inline struct ssusb_mtk *otg_sx_to_ssusb(struct otg_switch_mtk *otg_sx)
18{
19 return container_of(otg_sx, struct ssusb_mtk, otg_switch);
20}
21
22static void toggle_opstate(struct ssusb_mtk *ssusb)
23{
24 if (!ssusb->otg_switch.is_u3_drd) {
25 mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);
26 mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);
27 }
28}
29
30
31static int ssusb_port0_switch(struct ssusb_mtk *ssusb,
32 int version, bool tohost)
33{
34 void __iomem *ibase = ssusb->ippc_base;
35 u32 value;
36
37 dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,
38 version, tohost ? "host" : "device");
39
40 if (version == USB2_PORT) {
41
42 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
43 value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;
44 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
45
46
47 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
48 value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
49 value = tohost ? (value | SSUSB_U2_PORT_HOST_SEL) :
50 (value & (~SSUSB_U2_PORT_HOST_SEL));
51 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
52 } else {
53
54 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
55 value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;
56 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
57
58
59 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
60 value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
61 value = tohost ? (value | SSUSB_U3_PORT_HOST_SEL) :
62 (value & (~SSUSB_U3_PORT_HOST_SEL));
63 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
64 }
65
66 return 0;
67}
68
69static void switch_port_to_host(struct ssusb_mtk *ssusb)
70{
71 u32 check_clk = 0;
72
73 dev_dbg(ssusb->dev, "%s\n", __func__);
74
75 ssusb_port0_switch(ssusb, USB2_PORT, true);
76
77 if (ssusb->otg_switch.is_u3_drd) {
78 ssusb_port0_switch(ssusb, USB3_PORT, true);
79 check_clk = SSUSB_U3_MAC_RST_B_STS;
80 }
81
82 ssusb_check_clocks(ssusb, check_clk);
83
84
85 toggle_opstate(ssusb);
86}
87
88static void switch_port_to_device(struct ssusb_mtk *ssusb)
89{
90 u32 check_clk = 0;
91
92 dev_dbg(ssusb->dev, "%s\n", __func__);
93
94 ssusb_port0_switch(ssusb, USB2_PORT, false);
95
96 if (ssusb->otg_switch.is_u3_drd) {
97 ssusb_port0_switch(ssusb, USB3_PORT, false);
98 check_clk = SSUSB_U3_MAC_RST_B_STS;
99 }
100
101 ssusb_check_clocks(ssusb, check_clk);
102}
103
104int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on)
105{
106 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
107 struct regulator *vbus = otg_sx->vbus;
108 int ret;
109
110
111 if (!vbus)
112 return 0;
113
114 dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");
115
116 if (is_on) {
117 ret = regulator_enable(vbus);
118 if (ret) {
119 dev_err(ssusb->dev, "vbus regulator enable failed\n");
120 return ret;
121 }
122 } else {
123 regulator_disable(vbus);
124 }
125
126 return 0;
127}
128
129static void ssusb_mode_sw_work(struct work_struct *work)
130{
131 struct otg_switch_mtk *otg_sx =
132 container_of(work, struct otg_switch_mtk, dr_work);
133 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
134 struct mtu3 *mtu = ssusb->u3d;
135 enum usb_role desired_role = otg_sx->desired_role;
136 enum usb_role current_role;
137
138 current_role = ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;
139
140 if (desired_role == USB_ROLE_NONE) {
141
142 desired_role = USB_ROLE_HOST;
143 if (otg_sx->default_role == USB_ROLE_DEVICE)
144 desired_role = USB_ROLE_DEVICE;
145 }
146
147 if (current_role == desired_role)
148 return;
149
150 dev_dbg(ssusb->dev, "set role : %s\n", usb_role_string(desired_role));
151 mtu3_dbg_trace(ssusb->dev, "set role : %s", usb_role_string(desired_role));
152 pm_runtime_get_sync(ssusb->dev);
153
154 switch (desired_role) {
155 case USB_ROLE_HOST:
156 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
157 mtu3_stop(mtu);
158 switch_port_to_host(ssusb);
159 ssusb_set_vbus(otg_sx, 1);
160 ssusb->is_host = true;
161 break;
162 case USB_ROLE_DEVICE:
163 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_DEVICE);
164 ssusb->is_host = false;
165 ssusb_set_vbus(otg_sx, 0);
166 switch_port_to_device(ssusb);
167 mtu3_start(mtu);
168 break;
169 case USB_ROLE_NONE:
170 default:
171 dev_err(ssusb->dev, "invalid role\n");
172 }
173 pm_runtime_put(ssusb->dev);
174}
175
176static void ssusb_set_mode(struct otg_switch_mtk *otg_sx, enum usb_role role)
177{
178 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
179
180 if (ssusb->dr_mode != USB_DR_MODE_OTG)
181 return;
182
183 otg_sx->desired_role = role;
184 queue_work(system_freezable_wq, &otg_sx->dr_work);
185}
186
187static int ssusb_id_notifier(struct notifier_block *nb,
188 unsigned long event, void *ptr)
189{
190 struct otg_switch_mtk *otg_sx =
191 container_of(nb, struct otg_switch_mtk, id_nb);
192
193 ssusb_set_mode(otg_sx, event ? USB_ROLE_HOST : USB_ROLE_DEVICE);
194
195 return NOTIFY_DONE;
196}
197
198static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)
199{
200 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
201 struct extcon_dev *edev = otg_sx->edev;
202 int ret;
203
204
205 if (!edev)
206 return 0;
207
208 otg_sx->id_nb.notifier_call = ssusb_id_notifier;
209 ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,
210 &otg_sx->id_nb);
211 if (ret < 0) {
212 dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");
213 return ret;
214 }
215
216 ret = extcon_get_state(edev, EXTCON_USB_HOST);
217 dev_dbg(ssusb->dev, "EXTCON_USB_HOST: %d\n", ret);
218
219
220 if (!ret)
221 ssusb_set_mode(otg_sx, USB_ROLE_DEVICE);
222
223 return 0;
224}
225
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227
228
229
230
231
232void ssusb_mode_switch(struct ssusb_mtk *ssusb, int to_host)
233{
234 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
235
236 ssusb_set_mode(otg_sx, to_host ? USB_ROLE_HOST : USB_ROLE_DEVICE);
237}
238
239void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
240 enum mtu3_dr_force_mode mode)
241{
242 u32 value;
243
244 value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));
245 switch (mode) {
246 case MTU3_DR_FORCE_DEVICE:
247 value |= SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG;
248 break;
249 case MTU3_DR_FORCE_HOST:
250 value |= SSUSB_U2_PORT_FORCE_IDDIG;
251 value &= ~SSUSB_U2_PORT_RG_IDDIG;
252 break;
253 case MTU3_DR_FORCE_NONE:
254 value &= ~(SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG);
255 break;
256 default:
257 return;
258 }
259 mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
260}
261
262static int ssusb_role_sw_set(struct usb_role_switch *sw, enum usb_role role)
263{
264 struct ssusb_mtk *ssusb = usb_role_switch_get_drvdata(sw);
265 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
266
267 ssusb_set_mode(otg_sx, role);
268
269 return 0;
270}
271
272static enum usb_role ssusb_role_sw_get(struct usb_role_switch *sw)
273{
274 struct ssusb_mtk *ssusb = usb_role_switch_get_drvdata(sw);
275
276 return ssusb->is_host ? USB_ROLE_HOST : USB_ROLE_DEVICE;
277}
278
279static int ssusb_role_sw_register(struct otg_switch_mtk *otg_sx)
280{
281 struct usb_role_switch_desc role_sx_desc = { 0 };
282 struct ssusb_mtk *ssusb = otg_sx_to_ssusb(otg_sx);
283 struct device *dev = ssusb->dev;
284 enum usb_dr_mode mode;
285
286 if (!otg_sx->role_sw_used)
287 return 0;
288
289 mode = usb_get_role_switch_default_mode(dev);
290 if (mode == USB_DR_MODE_PERIPHERAL)
291 otg_sx->default_role = USB_ROLE_DEVICE;
292 else
293 otg_sx->default_role = USB_ROLE_HOST;
294
295 role_sx_desc.set = ssusb_role_sw_set;
296 role_sx_desc.get = ssusb_role_sw_get;
297 role_sx_desc.fwnode = dev_fwnode(dev);
298 role_sx_desc.driver_data = ssusb;
299 otg_sx->role_sw = usb_role_switch_register(dev, &role_sx_desc);
300 if (IS_ERR(otg_sx->role_sw))
301 return PTR_ERR(otg_sx->role_sw);
302
303 ssusb_set_mode(otg_sx, otg_sx->default_role);
304
305 return 0;
306}
307
308int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
309{
310 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
311 int ret = 0;
312
313 INIT_WORK(&otg_sx->dr_work, ssusb_mode_sw_work);
314
315 if (otg_sx->manual_drd_enabled)
316 ssusb_dr_debugfs_init(ssusb);
317 else if (otg_sx->role_sw_used)
318 ret = ssusb_role_sw_register(otg_sx);
319 else
320 ret = ssusb_extcon_register(otg_sx);
321
322 return ret;
323}
324
325void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
326{
327 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
328
329 cancel_work_sync(&otg_sx->dr_work);
330 usb_role_switch_unregister(otg_sx->role_sw);
331}
332
