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10#include <linux/debugfs.h>
11#include <linux/irq.h>
12#include <linux/kernel.h>
13#include <linux/of_device.h>
14#include <linux/pinctrl/consumer.h>
15#include <linux/seq_file.h>
16#include <linux/uaccess.h>
17
18#include "mtu3.h"
19#include "mtu3_dr.h"
20
21#define USB2_PORT 2
22#define USB3_PORT 3
23
24enum mtu3_vbus_id_state {
25 MTU3_ID_FLOAT = 1,
26 MTU3_ID_GROUND,
27 MTU3_VBUS_OFF,
28 MTU3_VBUS_VALID,
29};
30
31static void toggle_opstate(struct ssusb_mtk *ssusb)
32{
33 if (!ssusb->otg_switch.is_u3_drd) {
34 mtu3_setbits(ssusb->mac_base, U3D_DEVICE_CONTROL, DC_SESSION);
35 mtu3_setbits(ssusb->mac_base, U3D_POWER_MANAGEMENT, SOFT_CONN);
36 }
37}
38
39
40static int ssusb_port0_switch(struct ssusb_mtk *ssusb,
41 int version, bool tohost)
42{
43 void __iomem *ibase = ssusb->ippc_base;
44 u32 value;
45
46 dev_dbg(ssusb->dev, "%s (switch u%d port0 to %s)\n", __func__,
47 version, tohost ? "host" : "device");
48
49 if (version == USB2_PORT) {
50
51 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
52 value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;
53 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
54
55
56 value = mtu3_readl(ibase, SSUSB_U2_CTRL(0));
57 value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
58 value = tohost ? (value | SSUSB_U2_PORT_HOST_SEL) :
59 (value & (~SSUSB_U2_PORT_HOST_SEL));
60 mtu3_writel(ibase, SSUSB_U2_CTRL(0), value);
61 } else {
62
63 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
64 value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;
65 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
66
67
68 value = mtu3_readl(ibase, SSUSB_U3_CTRL(0));
69 value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
70 value = tohost ? (value | SSUSB_U3_PORT_HOST_SEL) :
71 (value & (~SSUSB_U3_PORT_HOST_SEL));
72 mtu3_writel(ibase, SSUSB_U3_CTRL(0), value);
73 }
74
75 return 0;
76}
77
78static void switch_port_to_host(struct ssusb_mtk *ssusb)
79{
80 u32 check_clk = 0;
81
82 dev_dbg(ssusb->dev, "%s\n", __func__);
83
84 ssusb_port0_switch(ssusb, USB2_PORT, true);
85
86 if (ssusb->otg_switch.is_u3_drd) {
87 ssusb_port0_switch(ssusb, USB3_PORT, true);
88 check_clk = SSUSB_U3_MAC_RST_B_STS;
89 }
90
91 ssusb_check_clocks(ssusb, check_clk);
92
93
94 toggle_opstate(ssusb);
95}
96
97static void switch_port_to_device(struct ssusb_mtk *ssusb)
98{
99 u32 check_clk = 0;
100
101 dev_dbg(ssusb->dev, "%s\n", __func__);
102
103 ssusb_port0_switch(ssusb, USB2_PORT, false);
104
105 if (ssusb->otg_switch.is_u3_drd) {
106 ssusb_port0_switch(ssusb, USB3_PORT, false);
107 check_clk = SSUSB_U3_MAC_RST_B_STS;
108 }
109
110 ssusb_check_clocks(ssusb, check_clk);
111}
112
113int ssusb_set_vbus(struct otg_switch_mtk *otg_sx, int is_on)
114{
115 struct ssusb_mtk *ssusb =
116 container_of(otg_sx, struct ssusb_mtk, otg_switch);
117 struct regulator *vbus = otg_sx->vbus;
118 int ret;
119
120
121 if (!vbus)
122 return 0;
123
124 dev_dbg(ssusb->dev, "%s: turn %s\n", __func__, is_on ? "on" : "off");
125
126 if (is_on) {
127 ret = regulator_enable(vbus);
128 if (ret) {
129 dev_err(ssusb->dev, "vbus regulator enable failed\n");
130 return ret;
131 }
132 } else {
133 regulator_disable(vbus);
134 }
135
136 return 0;
137}
138
139
140
141
142
143static void ssusb_set_mailbox(struct otg_switch_mtk *otg_sx,
144 enum mtu3_vbus_id_state status)
145{
146 struct ssusb_mtk *ssusb =
147 container_of(otg_sx, struct ssusb_mtk, otg_switch);
148 struct mtu3 *mtu = ssusb->u3d;
149
150 dev_dbg(ssusb->dev, "mailbox state(%d)\n", status);
151
152 switch (status) {
153 case MTU3_ID_GROUND:
154 switch_port_to_host(ssusb);
155 ssusb_set_vbus(otg_sx, 1);
156 ssusb->is_host = true;
157 break;
158 case MTU3_ID_FLOAT:
159 ssusb->is_host = false;
160 ssusb_set_vbus(otg_sx, 0);
161 switch_port_to_device(ssusb);
162 break;
163 case MTU3_VBUS_OFF:
164 mtu3_stop(mtu);
165 pm_relax(ssusb->dev);
166 break;
167 case MTU3_VBUS_VALID:
168
169 pm_stay_awake(ssusb->dev);
170 mtu3_start(mtu);
171 break;
172 default:
173 dev_err(ssusb->dev, "invalid state\n");
174 }
175}
176
177static void ssusb_id_work(struct work_struct *work)
178{
179 struct otg_switch_mtk *otg_sx =
180 container_of(work, struct otg_switch_mtk, id_work);
181
182 if (otg_sx->id_event)
183 ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
184 else
185 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
186}
187
188static void ssusb_vbus_work(struct work_struct *work)
189{
190 struct otg_switch_mtk *otg_sx =
191 container_of(work, struct otg_switch_mtk, vbus_work);
192
193 if (otg_sx->vbus_event)
194 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
195 else
196 ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
197}
198
199
200
201
202
203static int ssusb_id_notifier(struct notifier_block *nb,
204 unsigned long event, void *ptr)
205{
206 struct otg_switch_mtk *otg_sx =
207 container_of(nb, struct otg_switch_mtk, id_nb);
208
209 otg_sx->id_event = event;
210 schedule_work(&otg_sx->id_work);
211
212 return NOTIFY_DONE;
213}
214
215static int ssusb_vbus_notifier(struct notifier_block *nb,
216 unsigned long event, void *ptr)
217{
218 struct otg_switch_mtk *otg_sx =
219 container_of(nb, struct otg_switch_mtk, vbus_nb);
220
221 otg_sx->vbus_event = event;
222 schedule_work(&otg_sx->vbus_work);
223
224 return NOTIFY_DONE;
225}
226
227static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)
228{
229 struct ssusb_mtk *ssusb =
230 container_of(otg_sx, struct ssusb_mtk, otg_switch);
231 struct extcon_dev *edev = otg_sx->edev;
232 int ret;
233
234
235 if (!edev)
236 return 0;
237
238 otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier;
239 ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB,
240 &otg_sx->vbus_nb);
241 if (ret < 0)
242 dev_err(ssusb->dev, "failed to register notifier for USB\n");
243
244 otg_sx->id_nb.notifier_call = ssusb_id_notifier;
245 ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,
246 &otg_sx->id_nb);
247 if (ret < 0)
248 dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");
249
250 dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
251 extcon_get_state(edev, EXTCON_USB),
252 extcon_get_state(edev, EXTCON_USB_HOST));
253
254
255 if (extcon_get_state(edev, EXTCON_USB_HOST) == false)
256 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
257 if (extcon_get_state(edev, EXTCON_USB) == true)
258 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
259
260 return 0;
261}
262
263
264
265
266
267
268
269static void ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host)
270{
271 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
272
273 if (to_host) {
274 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
275 ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
276 ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
277 } else {
278 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_DEVICE);
279 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
280 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
281 }
282}
283
284static int ssusb_mode_show(struct seq_file *sf, void *unused)
285{
286 struct ssusb_mtk *ssusb = sf->private;
287
288 seq_printf(sf, "current mode: %s(%s drd)\n(echo device/host)\n",
289 ssusb->is_host ? "host" : "device",
290 ssusb->otg_switch.manual_drd_enabled ? "manual" : "auto");
291
292 return 0;
293}
294
295static int ssusb_mode_open(struct inode *inode, struct file *file)
296{
297 return single_open(file, ssusb_mode_show, inode->i_private);
298}
299
300static ssize_t ssusb_mode_write(struct file *file,
301 const char __user *ubuf, size_t count, loff_t *ppos)
302{
303 struct seq_file *sf = file->private_data;
304 struct ssusb_mtk *ssusb = sf->private;
305 char buf[16];
306
307 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
308 return -EFAULT;
309
310 if (!strncmp(buf, "host", 4) && !ssusb->is_host) {
311 ssusb_mode_manual_switch(ssusb, 1);
312 } else if (!strncmp(buf, "device", 6) && ssusb->is_host) {
313 ssusb_mode_manual_switch(ssusb, 0);
314 } else {
315 dev_err(ssusb->dev, "wrong or duplicated setting\n");
316 return -EINVAL;
317 }
318
319 return count;
320}
321
322static const struct file_operations ssusb_mode_fops = {
323 .open = ssusb_mode_open,
324 .write = ssusb_mode_write,
325 .read = seq_read,
326 .llseek = seq_lseek,
327 .release = single_release,
328};
329
330static int ssusb_vbus_show(struct seq_file *sf, void *unused)
331{
332 struct ssusb_mtk *ssusb = sf->private;
333 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
334
335 seq_printf(sf, "vbus state: %s\n(echo on/off)\n",
336 regulator_is_enabled(otg_sx->vbus) ? "on" : "off");
337
338 return 0;
339}
340
341static int ssusb_vbus_open(struct inode *inode, struct file *file)
342{
343 return single_open(file, ssusb_vbus_show, inode->i_private);
344}
345
346static ssize_t ssusb_vbus_write(struct file *file,
347 const char __user *ubuf, size_t count, loff_t *ppos)
348{
349 struct seq_file *sf = file->private_data;
350 struct ssusb_mtk *ssusb = sf->private;
351 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
352 char buf[16];
353 bool enable;
354
355 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
356 return -EFAULT;
357
358 if (kstrtobool(buf, &enable)) {
359 dev_err(ssusb->dev, "wrong setting\n");
360 return -EINVAL;
361 }
362
363 ssusb_set_vbus(otg_sx, enable);
364
365 return count;
366}
367
368static const struct file_operations ssusb_vbus_fops = {
369 .open = ssusb_vbus_open,
370 .write = ssusb_vbus_write,
371 .read = seq_read,
372 .llseek = seq_lseek,
373 .release = single_release,
374};
375
376static void ssusb_debugfs_init(struct ssusb_mtk *ssusb)
377{
378 struct dentry *root;
379
380 root = debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);
381 ssusb->dbgfs_root = root;
382
383 debugfs_create_file("mode", 0644, root, ssusb, &ssusb_mode_fops);
384 debugfs_create_file("vbus", 0644, root, ssusb, &ssusb_vbus_fops);
385}
386
387static void ssusb_debugfs_exit(struct ssusb_mtk *ssusb)
388{
389 debugfs_remove_recursive(ssusb->dbgfs_root);
390}
391
392void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
393 enum mtu3_dr_force_mode mode)
394{
395 u32 value;
396
397 value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));
398 switch (mode) {
399 case MTU3_DR_FORCE_DEVICE:
400 value |= SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG;
401 break;
402 case MTU3_DR_FORCE_HOST:
403 value |= SSUSB_U2_PORT_FORCE_IDDIG;
404 value &= ~SSUSB_U2_PORT_RG_IDDIG;
405 break;
406 case MTU3_DR_FORCE_NONE:
407 value &= ~(SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG);
408 break;
409 default:
410 return;
411 }
412 mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
413}
414
415int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
416{
417 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
418
419 INIT_WORK(&otg_sx->id_work, ssusb_id_work);
420 INIT_WORK(&otg_sx->vbus_work, ssusb_vbus_work);
421
422 if (otg_sx->manual_drd_enabled)
423 ssusb_debugfs_init(ssusb);
424 else
425 ssusb_extcon_register(otg_sx);
426
427 return 0;
428}
429
430void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
431{
432 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
433
434 if (otg_sx->manual_drd_enabled)
435 ssusb_debugfs_exit(ssusb);
436
437 cancel_work_sync(&otg_sx->id_work);
438 cancel_work_sync(&otg_sx->vbus_work);
439}
440
