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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 int ssusb_id_notifier(struct notifier_block *nb,
178 unsigned long event, void *ptr)
179{
180 struct otg_switch_mtk *otg_sx =
181 container_of(nb, struct otg_switch_mtk, id_nb);
182
183 if (event)
184 ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
185 else
186 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
187
188 return NOTIFY_DONE;
189}
190
191static int ssusb_vbus_notifier(struct notifier_block *nb,
192 unsigned long event, void *ptr)
193{
194 struct otg_switch_mtk *otg_sx =
195 container_of(nb, struct otg_switch_mtk, vbus_nb);
196
197 if (event)
198 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
199 else
200 ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
201
202 return NOTIFY_DONE;
203}
204
205static int ssusb_extcon_register(struct otg_switch_mtk *otg_sx)
206{
207 struct ssusb_mtk *ssusb =
208 container_of(otg_sx, struct ssusb_mtk, otg_switch);
209 struct extcon_dev *edev = otg_sx->edev;
210 int ret;
211
212
213 if (!edev)
214 return 0;
215
216 otg_sx->vbus_nb.notifier_call = ssusb_vbus_notifier;
217 ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB,
218 &otg_sx->vbus_nb);
219 if (ret < 0)
220 dev_err(ssusb->dev, "failed to register notifier for USB\n");
221
222 otg_sx->id_nb.notifier_call = ssusb_id_notifier;
223 ret = devm_extcon_register_notifier(ssusb->dev, edev, EXTCON_USB_HOST,
224 &otg_sx->id_nb);
225 if (ret < 0)
226 dev_err(ssusb->dev, "failed to register notifier for USB-HOST\n");
227
228 dev_dbg(ssusb->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
229 extcon_get_state(edev, EXTCON_USB),
230 extcon_get_state(edev, EXTCON_USB_HOST));
231
232
233 if (extcon_get_state(edev, EXTCON_USB_HOST) == false)
234 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
235 if (extcon_get_state(edev, EXTCON_USB) == true)
236 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
237
238 return 0;
239}
240
241static void extcon_register_dwork(struct work_struct *work)
242{
243 struct delayed_work *dwork = to_delayed_work(work);
244 struct otg_switch_mtk *otg_sx =
245 container_of(dwork, struct otg_switch_mtk, extcon_reg_dwork);
246
247 ssusb_extcon_register(otg_sx);
248}
249
250
251
252
253
254
255
256static void ssusb_mode_manual_switch(struct ssusb_mtk *ssusb, int to_host)
257{
258 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
259
260 if (to_host) {
261 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
262 ssusb_set_mailbox(otg_sx, MTU3_VBUS_OFF);
263 ssusb_set_mailbox(otg_sx, MTU3_ID_GROUND);
264 } else {
265 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_DEVICE);
266 ssusb_set_mailbox(otg_sx, MTU3_ID_FLOAT);
267 ssusb_set_mailbox(otg_sx, MTU3_VBUS_VALID);
268 }
269}
270
271static int ssusb_mode_show(struct seq_file *sf, void *unused)
272{
273 struct ssusb_mtk *ssusb = sf->private;
274
275 seq_printf(sf, "current mode: %s(%s drd)\n(echo device/host)\n",
276 ssusb->is_host ? "host" : "device",
277 ssusb->otg_switch.manual_drd_enabled ? "manual" : "auto");
278
279 return 0;
280}
281
282static int ssusb_mode_open(struct inode *inode, struct file *file)
283{
284 return single_open(file, ssusb_mode_show, inode->i_private);
285}
286
287static ssize_t ssusb_mode_write(struct file *file,
288 const char __user *ubuf, size_t count, loff_t *ppos)
289{
290 struct seq_file *sf = file->private_data;
291 struct ssusb_mtk *ssusb = sf->private;
292 char buf[16];
293
294 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
295 return -EFAULT;
296
297 if (!strncmp(buf, "host", 4) && !ssusb->is_host) {
298 ssusb_mode_manual_switch(ssusb, 1);
299 } else if (!strncmp(buf, "device", 6) && ssusb->is_host) {
300 ssusb_mode_manual_switch(ssusb, 0);
301 } else {
302 dev_err(ssusb->dev, "wrong or duplicated setting\n");
303 return -EINVAL;
304 }
305
306 return count;
307}
308
309static const struct file_operations ssusb_mode_fops = {
310 .open = ssusb_mode_open,
311 .write = ssusb_mode_write,
312 .read = seq_read,
313 .llseek = seq_lseek,
314 .release = single_release,
315};
316
317static int ssusb_vbus_show(struct seq_file *sf, void *unused)
318{
319 struct ssusb_mtk *ssusb = sf->private;
320 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
321
322 seq_printf(sf, "vbus state: %s\n(echo on/off)\n",
323 regulator_is_enabled(otg_sx->vbus) ? "on" : "off");
324
325 return 0;
326}
327
328static int ssusb_vbus_open(struct inode *inode, struct file *file)
329{
330 return single_open(file, ssusb_vbus_show, inode->i_private);
331}
332
333static ssize_t ssusb_vbus_write(struct file *file,
334 const char __user *ubuf, size_t count, loff_t *ppos)
335{
336 struct seq_file *sf = file->private_data;
337 struct ssusb_mtk *ssusb = sf->private;
338 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
339 char buf[16];
340 bool enable;
341
342 if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
343 return -EFAULT;
344
345 if (kstrtobool(buf, &enable)) {
346 dev_err(ssusb->dev, "wrong setting\n");
347 return -EINVAL;
348 }
349
350 ssusb_set_vbus(otg_sx, enable);
351
352 return count;
353}
354
355static const struct file_operations ssusb_vbus_fops = {
356 .open = ssusb_vbus_open,
357 .write = ssusb_vbus_write,
358 .read = seq_read,
359 .llseek = seq_lseek,
360 .release = single_release,
361};
362
363static void ssusb_debugfs_init(struct ssusb_mtk *ssusb)
364{
365 struct dentry *root;
366
367 root = debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);
368 if (!root) {
369 dev_err(ssusb->dev, "create debugfs root failed\n");
370 return;
371 }
372 ssusb->dbgfs_root = root;
373
374 debugfs_create_file("mode", 0644, root, ssusb, &ssusb_mode_fops);
375 debugfs_create_file("vbus", 0644, root, ssusb, &ssusb_vbus_fops);
376}
377
378static void ssusb_debugfs_exit(struct ssusb_mtk *ssusb)
379{
380 debugfs_remove_recursive(ssusb->dbgfs_root);
381}
382
383void ssusb_set_force_mode(struct ssusb_mtk *ssusb,
384 enum mtu3_dr_force_mode mode)
385{
386 u32 value;
387
388 value = mtu3_readl(ssusb->ippc_base, SSUSB_U2_CTRL(0));
389 switch (mode) {
390 case MTU3_DR_FORCE_DEVICE:
391 value |= SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG;
392 break;
393 case MTU3_DR_FORCE_HOST:
394 value |= SSUSB_U2_PORT_FORCE_IDDIG;
395 value &= ~SSUSB_U2_PORT_RG_IDDIG;
396 break;
397 case MTU3_DR_FORCE_NONE:
398 value &= ~(SSUSB_U2_PORT_FORCE_IDDIG | SSUSB_U2_PORT_RG_IDDIG);
399 break;
400 default:
401 return;
402 }
403 mtu3_writel(ssusb->ippc_base, SSUSB_U2_CTRL(0), value);
404}
405
406int ssusb_otg_switch_init(struct ssusb_mtk *ssusb)
407{
408 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
409
410 if (otg_sx->manual_drd_enabled) {
411 ssusb_debugfs_init(ssusb);
412 } else {
413 INIT_DELAYED_WORK(&otg_sx->extcon_reg_dwork,
414 extcon_register_dwork);
415
416
417
418
419
420 schedule_delayed_work(&otg_sx->extcon_reg_dwork, HZ);
421 }
422
423 return 0;
424}
425
426void ssusb_otg_switch_exit(struct ssusb_mtk *ssusb)
427{
428 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
429
430 if (otg_sx->manual_drd_enabled)
431 ssusb_debugfs_exit(ssusb);
432 else
433 cancel_delayed_work(&otg_sx->extcon_reg_dwork);
434}
435
