1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/device.h>
4 #include <linux/types.h>
5 #include <linux/spinlock.h>
6 #include <linux/debugfs.h>
7 #include <linux/seq_file.h>
8 #include <linux/uaccess.h>
9 #include <linux/usb/ch9.h>
10 #include <linux/usb/gadget.h>
11 #include <linux/usb/phy.h>
12 #include <linux/usb/otg.h>
13 #include <linux/usb/otg-fsm.h>
14 #include <linux/usb/chipidea.h>
15
16 #include "ci.h"
17 #include "udc.h"
18 #include "bits.h"
19 #include "otg.h"
20
21 /**
22 * ci_device_show: prints information about device capabilities and status
23 */
ci_device_show(struct seq_file * s,void * data)24 static int ci_device_show(struct seq_file *s, void *data)
25 {
26 struct ci_hdrc *ci = s->private;
27 struct usb_gadget *gadget = &ci->gadget;
28
29 seq_printf(s, "speed = %d\n", gadget->speed);
30 seq_printf(s, "max_speed = %d\n", gadget->max_speed);
31 seq_printf(s, "is_otg = %d\n", gadget->is_otg);
32 seq_printf(s, "is_a_peripheral = %d\n", gadget->is_a_peripheral);
33 seq_printf(s, "b_hnp_enable = %d\n", gadget->b_hnp_enable);
34 seq_printf(s, "a_hnp_support = %d\n", gadget->a_hnp_support);
35 seq_printf(s, "a_alt_hnp_support = %d\n", gadget->a_alt_hnp_support);
36 seq_printf(s, "name = %s\n",
37 (gadget->name ? gadget->name : ""));
38
39 if (!ci->driver)
40 return 0;
41
42 seq_printf(s, "gadget function = %s\n",
43 (ci->driver->function ? ci->driver->function : ""));
44 seq_printf(s, "gadget max speed = %d\n", ci->driver->max_speed);
45
46 return 0;
47 }
48 DEFINE_SHOW_ATTRIBUTE(ci_device);
49
50 /**
51 * ci_port_test_show: reads port test mode
52 */
ci_port_test_show(struct seq_file * s,void * data)53 static int ci_port_test_show(struct seq_file *s, void *data)
54 {
55 struct ci_hdrc *ci = s->private;
56 unsigned long flags;
57 unsigned mode;
58
59 pm_runtime_get_sync(ci->dev);
60 spin_lock_irqsave(&ci->lock, flags);
61 mode = hw_port_test_get(ci);
62 spin_unlock_irqrestore(&ci->lock, flags);
63 pm_runtime_put_sync(ci->dev);
64
65 seq_printf(s, "mode = %u\n", mode);
66
67 return 0;
68 }
69
70 /**
71 * ci_port_test_write: writes port test mode
72 */
ci_port_test_write(struct file * file,const char __user * ubuf,size_t count,loff_t * ppos)73 static ssize_t ci_port_test_write(struct file *file, const char __user *ubuf,
74 size_t count, loff_t *ppos)
75 {
76 struct seq_file *s = file->private_data;
77 struct ci_hdrc *ci = s->private;
78 unsigned long flags;
79 unsigned mode;
80 char buf[32];
81 int ret;
82
83 count = min_t(size_t, sizeof(buf) - 1, count);
84 if (copy_from_user(buf, ubuf, count))
85 return -EFAULT;
86
87 /* sscanf requires a zero terminated string */
88 buf[count] = '\0';
89
90 if (sscanf(buf, "%u", &mode) != 1)
91 return -EINVAL;
92
93 if (mode > 255)
94 return -EBADRQC;
95
96 pm_runtime_get_sync(ci->dev);
97 spin_lock_irqsave(&ci->lock, flags);
98 ret = hw_port_test_set(ci, mode);
99 spin_unlock_irqrestore(&ci->lock, flags);
100 pm_runtime_put_sync(ci->dev);
101
102 return ret ? ret : count;
103 }
104
ci_port_test_open(struct inode * inode,struct file * file)105 static int ci_port_test_open(struct inode *inode, struct file *file)
106 {
107 return single_open(file, ci_port_test_show, inode->i_private);
108 }
109
110 static const struct file_operations ci_port_test_fops = {
111 .open = ci_port_test_open,
112 .write = ci_port_test_write,
113 .read = seq_read,
114 .llseek = seq_lseek,
115 .release = single_release,
116 };
117
118 /**
119 * ci_qheads_show: DMA contents of all queue heads
120 */
ci_qheads_show(struct seq_file * s,void * data)121 static int ci_qheads_show(struct seq_file *s, void *data)
122 {
123 struct ci_hdrc *ci = s->private;
124 unsigned long flags;
125 unsigned i, j;
126
127 if (ci->role != CI_ROLE_GADGET) {
128 seq_printf(s, "not in gadget mode\n");
129 return 0;
130 }
131
132 spin_lock_irqsave(&ci->lock, flags);
133 for (i = 0; i < ci->hw_ep_max/2; i++) {
134 struct ci_hw_ep *hweprx = &ci->ci_hw_ep[i];
135 struct ci_hw_ep *hweptx =
136 &ci->ci_hw_ep[i + ci->hw_ep_max/2];
137 seq_printf(s, "EP=%02i: RX=%08X TX=%08X\n",
138 i, (u32)hweprx->qh.dma, (u32)hweptx->qh.dma);
139 for (j = 0; j < (sizeof(struct ci_hw_qh)/sizeof(u32)); j++)
140 seq_printf(s, " %04X: %08X %08X\n", j,
141 *((u32 *)hweprx->qh.ptr + j),
142 *((u32 *)hweptx->qh.ptr + j));
143 }
144 spin_unlock_irqrestore(&ci->lock, flags);
145
146 return 0;
147 }
148 DEFINE_SHOW_ATTRIBUTE(ci_qheads);
149
150 /**
151 * ci_requests_show: DMA contents of all requests currently queued (all endpts)
152 */
ci_requests_show(struct seq_file * s,void * data)153 static int ci_requests_show(struct seq_file *s, void *data)
154 {
155 struct ci_hdrc *ci = s->private;
156 unsigned long flags;
157 struct ci_hw_req *req = NULL;
158 struct td_node *node, *tmpnode;
159 unsigned i, j, qsize = sizeof(struct ci_hw_td)/sizeof(u32);
160
161 if (ci->role != CI_ROLE_GADGET) {
162 seq_printf(s, "not in gadget mode\n");
163 return 0;
164 }
165
166 spin_lock_irqsave(&ci->lock, flags);
167 for (i = 0; i < ci->hw_ep_max; i++)
168 list_for_each_entry(req, &ci->ci_hw_ep[i].qh.queue, queue) {
169 list_for_each_entry_safe(node, tmpnode, &req->tds, td) {
170 seq_printf(s, "EP=%02i: TD=%08X %s\n",
171 i % (ci->hw_ep_max / 2),
172 (u32)node->dma,
173 ((i < ci->hw_ep_max/2) ?
174 "RX" : "TX"));
175
176 for (j = 0; j < qsize; j++)
177 seq_printf(s, " %04X: %08X\n", j,
178 *((u32 *)node->ptr + j));
179 }
180 }
181 spin_unlock_irqrestore(&ci->lock, flags);
182
183 return 0;
184 }
185 DEFINE_SHOW_ATTRIBUTE(ci_requests);
186
ci_otg_show(struct seq_file * s,void * unused)187 static int ci_otg_show(struct seq_file *s, void *unused)
188 {
189 struct ci_hdrc *ci = s->private;
190 struct otg_fsm *fsm;
191
192 if (!ci || !ci_otg_is_fsm_mode(ci))
193 return 0;
194
195 fsm = &ci->fsm;
196
197 /* ------ State ----- */
198 seq_printf(s, "OTG state: %s\n\n",
199 usb_otg_state_string(ci->otg.state));
200
201 /* ------ State Machine Variables ----- */
202 seq_printf(s, "a_bus_drop: %d\n", fsm->a_bus_drop);
203
204 seq_printf(s, "a_bus_req: %d\n", fsm->a_bus_req);
205
206 seq_printf(s, "a_srp_det: %d\n", fsm->a_srp_det);
207
208 seq_printf(s, "a_vbus_vld: %d\n", fsm->a_vbus_vld);
209
210 seq_printf(s, "b_conn: %d\n", fsm->b_conn);
211
212 seq_printf(s, "adp_change: %d\n", fsm->adp_change);
213
214 seq_printf(s, "power_up: %d\n", fsm->power_up);
215
216 seq_printf(s, "a_bus_resume: %d\n", fsm->a_bus_resume);
217
218 seq_printf(s, "a_bus_suspend: %d\n", fsm->a_bus_suspend);
219
220 seq_printf(s, "a_conn: %d\n", fsm->a_conn);
221
222 seq_printf(s, "b_bus_req: %d\n", fsm->b_bus_req);
223
224 seq_printf(s, "b_bus_suspend: %d\n", fsm->b_bus_suspend);
225
226 seq_printf(s, "b_se0_srp: %d\n", fsm->b_se0_srp);
227
228 seq_printf(s, "b_ssend_srp: %d\n", fsm->b_ssend_srp);
229
230 seq_printf(s, "b_sess_vld: %d\n", fsm->b_sess_vld);
231
232 seq_printf(s, "b_srp_done: %d\n", fsm->b_srp_done);
233
234 seq_printf(s, "drv_vbus: %d\n", fsm->drv_vbus);
235
236 seq_printf(s, "loc_conn: %d\n", fsm->loc_conn);
237
238 seq_printf(s, "loc_sof: %d\n", fsm->loc_sof);
239
240 seq_printf(s, "adp_prb: %d\n", fsm->adp_prb);
241
242 seq_printf(s, "id: %d\n", fsm->id);
243
244 seq_printf(s, "protocol: %d\n", fsm->protocol);
245
246 return 0;
247 }
248 DEFINE_SHOW_ATTRIBUTE(ci_otg);
249
ci_role_show(struct seq_file * s,void * data)250 static int ci_role_show(struct seq_file *s, void *data)
251 {
252 struct ci_hdrc *ci = s->private;
253
254 if (ci->role != CI_ROLE_END)
255 seq_printf(s, "%s\n", ci_role(ci)->name);
256
257 return 0;
258 }
259
ci_role_write(struct file * file,const char __user * ubuf,size_t count,loff_t * ppos)260 static ssize_t ci_role_write(struct file *file, const char __user *ubuf,
261 size_t count, loff_t *ppos)
262 {
263 struct seq_file *s = file->private_data;
264 struct ci_hdrc *ci = s->private;
265 enum ci_role role;
266 char buf[8];
267 int ret;
268
269 if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
270 return -EFAULT;
271
272 for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
273 if (ci->roles[role] &&
274 !strncmp(buf, ci->roles[role]->name,
275 strlen(ci->roles[role]->name)))
276 break;
277
278 if (role == CI_ROLE_END || role == ci->role)
279 return -EINVAL;
280
281 pm_runtime_get_sync(ci->dev);
282 disable_irq(ci->irq);
283 ci_role_stop(ci);
284 ret = ci_role_start(ci, role);
285 enable_irq(ci->irq);
286 pm_runtime_put_sync(ci->dev);
287
288 return ret ? ret : count;
289 }
290
ci_role_open(struct inode * inode,struct file * file)291 static int ci_role_open(struct inode *inode, struct file *file)
292 {
293 return single_open(file, ci_role_show, inode->i_private);
294 }
295
296 static const struct file_operations ci_role_fops = {
297 .open = ci_role_open,
298 .write = ci_role_write,
299 .read = seq_read,
300 .llseek = seq_lseek,
301 .release = single_release,
302 };
303
ci_registers_show(struct seq_file * s,void * unused)304 static int ci_registers_show(struct seq_file *s, void *unused)
305 {
306 struct ci_hdrc *ci = s->private;
307 u32 tmp_reg;
308
309 if (!ci || ci->in_lpm)
310 return -EPERM;
311
312 /* ------ Registers ----- */
313 tmp_reg = hw_read_intr_enable(ci);
314 seq_printf(s, "USBINTR reg: %08x\n", tmp_reg);
315
316 tmp_reg = hw_read_intr_status(ci);
317 seq_printf(s, "USBSTS reg: %08x\n", tmp_reg);
318
319 tmp_reg = hw_read(ci, OP_USBMODE, ~0);
320 seq_printf(s, "USBMODE reg: %08x\n", tmp_reg);
321
322 tmp_reg = hw_read(ci, OP_USBCMD, ~0);
323 seq_printf(s, "USBCMD reg: %08x\n", tmp_reg);
324
325 tmp_reg = hw_read(ci, OP_PORTSC, ~0);
326 seq_printf(s, "PORTSC reg: %08x\n", tmp_reg);
327
328 if (ci->is_otg) {
329 tmp_reg = hw_read_otgsc(ci, ~0);
330 seq_printf(s, "OTGSC reg: %08x\n", tmp_reg);
331 }
332
333 return 0;
334 }
335 DEFINE_SHOW_ATTRIBUTE(ci_registers);
336
337 /**
338 * dbg_create_files: initializes the attribute interface
339 * @ci: device
340 *
341 * This function returns an error code
342 */
dbg_create_files(struct ci_hdrc * ci)343 void dbg_create_files(struct ci_hdrc *ci)
344 {
345 ci->debugfs = debugfs_create_dir(dev_name(ci->dev), NULL);
346
347 debugfs_create_file("device", S_IRUGO, ci->debugfs, ci,
348 &ci_device_fops);
349 debugfs_create_file("port_test", S_IRUGO | S_IWUSR, ci->debugfs, ci,
350 &ci_port_test_fops);
351 debugfs_create_file("qheads", S_IRUGO, ci->debugfs, ci,
352 &ci_qheads_fops);
353 debugfs_create_file("requests", S_IRUGO, ci->debugfs, ci,
354 &ci_requests_fops);
355
356 if (ci_otg_is_fsm_mode(ci)) {
357 debugfs_create_file("otg", S_IRUGO, ci->debugfs, ci,
358 &ci_otg_fops);
359 }
360
361 debugfs_create_file("role", S_IRUGO | S_IWUSR, ci->debugfs, ci,
362 &ci_role_fops);
363 debugfs_create_file("registers", S_IRUGO, ci->debugfs, ci,
364 &ci_registers_fops);
365 }
366
367 /**
368 * dbg_remove_files: destroys the attribute interface
369 * @ci: device
370 */
dbg_remove_files(struct ci_hdrc * ci)371 void dbg_remove_files(struct ci_hdrc *ci)
372 {
373 debugfs_remove_recursive(ci->debugfs);
374 }
375
