xref: /openbmc/linux/drivers/usb/mtu3/mtu3_debugfs.c (revision c4f7ac64) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * mtu3_debugfs.c - debugfs interface
4  *
5  * Copyright (C) 2019 MediaTek Inc.
6  *
7  * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
8  */
9 
10 #include <linux/uaccess.h>
11 
12 #include "mtu3.h"
13 #include "mtu3_dr.h"
14 #include "mtu3_debug.h"
15 
16 #define dump_register(nm)		\
17 {					\
18 	.name = __stringify(nm),	\
19 	.offset = U3D_ ##nm,		\
20 }
21 
22 #define dump_prb_reg(nm, os)	\
23 {				\
24 	.name = nm,		\
25 	.offset = os,		\
26 }
27 
28 static const struct debugfs_reg32 mtu3_ippc_regs[] = {
29 	dump_register(SSUSB_IP_PW_CTRL0),
30 	dump_register(SSUSB_IP_PW_CTRL1),
31 	dump_register(SSUSB_IP_PW_CTRL2),
32 	dump_register(SSUSB_IP_PW_CTRL3),
33 	dump_register(SSUSB_OTG_STS),
34 	dump_register(SSUSB_IP_XHCI_CAP),
35 	dump_register(SSUSB_IP_DEV_CAP),
36 	dump_register(SSUSB_U3_CTRL_0P),
37 	dump_register(SSUSB_U2_CTRL_0P),
38 	dump_register(SSUSB_HW_ID),
39 	dump_register(SSUSB_HW_SUB_ID),
40 	dump_register(SSUSB_IP_SPARE0),
41 };
42 
43 static const struct debugfs_reg32 mtu3_dev_regs[] = {
44 	dump_register(LV1ISR),
45 	dump_register(LV1IER),
46 	dump_register(EPISR),
47 	dump_register(EPIER),
48 	dump_register(EP0CSR),
49 	dump_register(RXCOUNT0),
50 	dump_register(QISAR0),
51 	dump_register(QIER0),
52 	dump_register(QISAR1),
53 	dump_register(QIER1),
54 	dump_register(CAP_EPNTXFFSZ),
55 	dump_register(CAP_EPNRXFFSZ),
56 	dump_register(CAP_EPINFO),
57 	dump_register(MISC_CTRL),
58 };
59 
60 static const struct debugfs_reg32 mtu3_csr_regs[] = {
61 	dump_register(DEVICE_CONF),
62 	dump_register(DEV_LINK_INTR_ENABLE),
63 	dump_register(DEV_LINK_INTR),
64 	dump_register(LTSSM_CTRL),
65 	dump_register(USB3_CONFIG),
66 	dump_register(LINK_STATE_MACHINE),
67 	dump_register(LTSSM_INTR_ENABLE),
68 	dump_register(LTSSM_INTR),
69 	dump_register(U3U2_SWITCH_CTRL),
70 	dump_register(POWER_MANAGEMENT),
71 	dump_register(DEVICE_CONTROL),
72 	dump_register(COMMON_USB_INTR_ENABLE),
73 	dump_register(COMMON_USB_INTR),
74 	dump_register(USB20_MISC_CONTROL),
75 	dump_register(USB20_OPSTATE),
76 };
77 
78 static int mtu3_link_state_show(struct seq_file *sf, void *unused)
79 {
80 	struct mtu3 *mtu = sf->private;
81 	void __iomem *mbase = mtu->mac_base;
82 
83 	seq_printf(sf, "opstate: %#x, ltssm: %#x\n",
84 		   mtu3_readl(mbase, U3D_USB20_OPSTATE),
85 		   LTSSM_STATE(mtu3_readl(mbase, U3D_LINK_STATE_MACHINE)));
86 
87 	return 0;
88 }
89 
90 static int mtu3_ep_used_show(struct seq_file *sf, void *unused)
91 {
92 	struct mtu3 *mtu = sf->private;
93 	struct mtu3_ep *mep;
94 	unsigned long flags;
95 	int used = 0;
96 	int i;
97 
98 	spin_lock_irqsave(&mtu->lock, flags);
99 
100 	for (i = 0; i < mtu->num_eps; i++) {
101 		mep = mtu->in_eps + i;
102 		if (mep->flags & MTU3_EP_ENABLED) {
103 			seq_printf(sf, "%s - type: %d\n", mep->name, mep->type);
104 			used++;
105 		}
106 
107 		mep = mtu->out_eps + i;
108 		if (mep->flags & MTU3_EP_ENABLED) {
109 			seq_printf(sf, "%s - type: %d\n", mep->name, mep->type);
110 			used++;
111 		}
112 	}
113 	seq_printf(sf, "total used: %d eps\n", used);
114 
115 	spin_unlock_irqrestore(&mtu->lock, flags);
116 
117 	return 0;
118 }
119 
120 DEFINE_SHOW_ATTRIBUTE(mtu3_link_state);
121 DEFINE_SHOW_ATTRIBUTE(mtu3_ep_used);
122 
123 static void mtu3_debugfs_regset(struct mtu3 *mtu, void __iomem *base,
124 				const struct debugfs_reg32 *regs, size_t nregs,
125 				const char *name, struct dentry *parent)
126 {
127 	struct debugfs_regset32 *regset;
128 	struct mtu3_regset *mregs;
129 
130 	mregs = devm_kzalloc(mtu->dev, sizeof(*mregs), GFP_KERNEL);
131 	if (!mregs)
132 		return;
133 
134 	sprintf(mregs->name, "%s", name);
135 	regset = &mregs->regset;
136 	regset->regs = regs;
137 	regset->nregs = nregs;
138 	regset->base = base;
139 
140 	debugfs_create_regset32(mregs->name, 0444, parent, regset);
141 }
142 
143 static void mtu3_debugfs_ep_regset(struct mtu3 *mtu, struct mtu3_ep *mep,
144 				   struct dentry *parent)
145 {
146 	struct debugfs_reg32 *regs;
147 	int epnum = mep->epnum;
148 	int in = mep->is_in;
149 
150 	regs = devm_kcalloc(mtu->dev, 7, sizeof(*regs), GFP_KERNEL);
151 	if (!regs)
152 		return;
153 
154 	regs[0].name = in ? "TCR0" : "RCR0";
155 	regs[0].offset = in ? MU3D_EP_TXCR0(epnum) : MU3D_EP_RXCR0(epnum);
156 	regs[1].name = in ? "TCR1" : "RCR1";
157 	regs[1].offset = in ? MU3D_EP_TXCR1(epnum) : MU3D_EP_RXCR1(epnum);
158 	regs[2].name = in ? "TCR2" : "RCR2";
159 	regs[2].offset = in ? MU3D_EP_TXCR2(epnum) : MU3D_EP_RXCR2(epnum);
160 	regs[3].name = in ? "TQHIAR" : "RQHIAR";
161 	regs[3].offset = in ? USB_QMU_TQHIAR(epnum) : USB_QMU_RQHIAR(epnum);
162 	regs[4].name = in ? "TQCSR" : "RQCSR";
163 	regs[4].offset = in ? USB_QMU_TQCSR(epnum) : USB_QMU_RQCSR(epnum);
164 	regs[5].name = in ? "TQSAR" : "RQSAR";
165 	regs[5].offset = in ? USB_QMU_TQSAR(epnum) : USB_QMU_RQSAR(epnum);
166 	regs[6].name = in ? "TQCPR" : "RQCPR";
167 	regs[6].offset = in ? USB_QMU_TQCPR(epnum) : USB_QMU_RQCPR(epnum);
168 
169 	mtu3_debugfs_regset(mtu, mtu->mac_base, regs, 7, "ep-regs", parent);
170 }
171 
172 static int mtu3_ep_info_show(struct seq_file *sf, void *unused)
173 {
174 	struct mtu3_ep *mep = sf->private;
175 	struct mtu3 *mtu = mep->mtu;
176 	unsigned long flags;
177 
178 	spin_lock_irqsave(&mtu->lock, flags);
179 	seq_printf(sf, "ep - type:%d, maxp:%d, slot:%d, flags:%x\n",
180 		   mep->type, mep->maxp, mep->slot, mep->flags);
181 	spin_unlock_irqrestore(&mtu->lock, flags);
182 
183 	return 0;
184 }
185 
186 static int mtu3_fifo_show(struct seq_file *sf, void *unused)
187 {
188 	struct mtu3_ep *mep = sf->private;
189 	struct mtu3 *mtu = mep->mtu;
190 	unsigned long flags;
191 
192 	spin_lock_irqsave(&mtu->lock, flags);
193 	seq_printf(sf, "fifo - seg_size:%d, addr:%d, size:%d\n",
194 		   mep->fifo_seg_size, mep->fifo_addr, mep->fifo_size);
195 	spin_unlock_irqrestore(&mtu->lock, flags);
196 
197 	return 0;
198 }
199 
200 static int mtu3_qmu_ring_show(struct seq_file *sf, void *unused)
201 {
202 	struct mtu3_ep *mep = sf->private;
203 	struct mtu3 *mtu = mep->mtu;
204 	struct mtu3_gpd_ring *ring;
205 	unsigned long flags;
206 
207 	ring = &mep->gpd_ring;
208 	spin_lock_irqsave(&mtu->lock, flags);
209 	seq_printf(sf,
210 		   "qmu-ring - dma:%pad, start:%p, end:%p, enq:%p, dep:%p\n",
211 		   &ring->dma, ring->start, ring->end,
212 		   ring->enqueue, ring->dequeue);
213 	spin_unlock_irqrestore(&mtu->lock, flags);
214 
215 	return 0;
216 }
217 
218 static int mtu3_qmu_gpd_show(struct seq_file *sf, void *unused)
219 {
220 	struct mtu3_ep *mep = sf->private;
221 	struct mtu3 *mtu = mep->mtu;
222 	struct mtu3_gpd_ring *ring;
223 	struct qmu_gpd *gpd;
224 	dma_addr_t dma;
225 	unsigned long flags;
226 	int i;
227 
228 	spin_lock_irqsave(&mtu->lock, flags);
229 	ring = &mep->gpd_ring;
230 	gpd = ring->start;
231 	if (!gpd || !(mep->flags & MTU3_EP_ENABLED)) {
232 		seq_puts(sf, "empty!\n");
233 		goto out;
234 	}
235 
236 	for (i = 0; i < MAX_GPD_NUM; i++, gpd++) {
237 		dma = ring->dma + i * sizeof(*gpd);
238 		seq_printf(sf, "gpd.%03d -> %pad, %p: %08x %08x %08x %08x\n",
239 			   i, &dma, gpd, gpd->dw0_info, gpd->next_gpd,
240 			   gpd->buffer, gpd->dw3_info);
241 	}
242 
243 out:
244 	spin_unlock_irqrestore(&mtu->lock, flags);
245 
246 	return 0;
247 }
248 
249 static const struct mtu3_file_map mtu3_ep_files[] = {
250 	{"ep-info", mtu3_ep_info_show, },
251 	{"fifo", mtu3_fifo_show, },
252 	{"qmu-ring", mtu3_qmu_ring_show, },
253 	{"qmu-gpd", mtu3_qmu_gpd_show, },
254 };
255 
256 static int mtu3_ep_open(struct inode *inode, struct file *file)
257 {
258 	const char *file_name = file_dentry(file)->d_iname;
259 	const struct mtu3_file_map *f_map;
260 	int i;
261 
262 	for (i = 0; i < ARRAY_SIZE(mtu3_ep_files); i++) {
263 		f_map = &mtu3_ep_files[i];
264 
265 		if (strcmp(f_map->name, file_name) == 0)
266 			break;
267 	}
268 
269 	return single_open(file, f_map->show, inode->i_private);
270 }
271 
272 static const struct file_operations mtu3_ep_fops = {
273 	.open = mtu3_ep_open,
274 	.read = seq_read,
275 	.llseek = seq_lseek,
276 	.release = single_release,
277 };
278 
279 static const struct debugfs_reg32 mtu3_prb_regs[] = {
280 	dump_prb_reg("enable", U3D_SSUSB_PRB_CTRL0),
281 	dump_prb_reg("byte-sell", U3D_SSUSB_PRB_CTRL1),
282 	dump_prb_reg("byte-selh", U3D_SSUSB_PRB_CTRL2),
283 	dump_prb_reg("module-sel", U3D_SSUSB_PRB_CTRL3),
284 	dump_prb_reg("sw-out", U3D_SSUSB_PRB_CTRL4),
285 	dump_prb_reg("data", U3D_SSUSB_PRB_CTRL5),
286 };
287 
288 static int mtu3_probe_show(struct seq_file *sf, void *unused)
289 {
290 	const char *file_name = file_dentry(sf->file)->d_iname;
291 	struct mtu3 *mtu = sf->private;
292 	const struct debugfs_reg32 *regs;
293 	int i;
294 
295 	for (i = 0; i < ARRAY_SIZE(mtu3_prb_regs); i++) {
296 		regs = &mtu3_prb_regs[i];
297 
298 		if (strcmp(regs->name, file_name) == 0)
299 			break;
300 	}
301 
302 	seq_printf(sf, "0x%04x - 0x%08x\n", (u32)regs->offset,
303 		   mtu3_readl(mtu->ippc_base, (u32)regs->offset));
304 
305 	return 0;
306 }
307 
308 static int mtu3_probe_open(struct inode *inode, struct file *file)
309 {
310 	return single_open(file, mtu3_probe_show, inode->i_private);
311 }
312 
313 static ssize_t mtu3_probe_write(struct file *file, const char __user *ubuf,
314 				size_t count, loff_t *ppos)
315 {
316 	const char *file_name = file_dentry(file)->d_iname;
317 	struct seq_file *sf = file->private_data;
318 	struct mtu3 *mtu = sf->private;
319 	const struct debugfs_reg32 *regs;
320 	char buf[32];
321 	u32 val;
322 	int i;
323 
324 	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
325 		return -EFAULT;
326 
327 	if (kstrtou32(buf, 0, &val))
328 		return -EINVAL;
329 
330 	for (i = 0; i < ARRAY_SIZE(mtu3_prb_regs); i++) {
331 		regs = &mtu3_prb_regs[i];
332 
333 		if (strcmp(regs->name, file_name) == 0)
334 			break;
335 	}
336 	mtu3_writel(mtu->ippc_base, (u32)regs->offset, val);
337 
338 	return count;
339 }
340 
341 static const struct file_operations mtu3_probe_fops = {
342 	.open = mtu3_probe_open,
343 	.write = mtu3_probe_write,
344 	.read = seq_read,
345 	.llseek = seq_lseek,
346 	.release = single_release,
347 };
348 
349 static void mtu3_debugfs_create_prb_files(struct mtu3 *mtu)
350 {
351 	struct ssusb_mtk *ssusb = mtu->ssusb;
352 	const struct debugfs_reg32 *regs;
353 	struct dentry *dir_prb;
354 	int i;
355 
356 	dir_prb = debugfs_create_dir("probe", ssusb->dbgfs_root);
357 
358 	for (i = 0; i < ARRAY_SIZE(mtu3_prb_regs); i++) {
359 		regs = &mtu3_prb_regs[i];
360 		debugfs_create_file(regs->name, 0644, dir_prb,
361 				    mtu, &mtu3_probe_fops);
362 	}
363 
364 	mtu3_debugfs_regset(mtu, mtu->ippc_base, mtu3_prb_regs,
365 			    ARRAY_SIZE(mtu3_prb_regs), "regs", dir_prb);
366 }
367 
368 static void mtu3_debugfs_create_ep_dir(struct mtu3_ep *mep,
369 				       struct dentry *parent)
370 {
371 	const struct mtu3_file_map *files;
372 	struct dentry *dir_ep;
373 	int i;
374 
375 	dir_ep = debugfs_create_dir(mep->name, parent);
376 	mtu3_debugfs_ep_regset(mep->mtu, mep, dir_ep);
377 
378 	for (i = 0; i < ARRAY_SIZE(mtu3_ep_files); i++) {
379 		files = &mtu3_ep_files[i];
380 
381 		debugfs_create_file(files->name, 0444, dir_ep,
382 				    mep, &mtu3_ep_fops);
383 	}
384 }
385 
386 static void mtu3_debugfs_create_ep_dirs(struct mtu3 *mtu)
387 {
388 	struct ssusb_mtk *ssusb = mtu->ssusb;
389 	struct dentry *dir_eps;
390 	int i;
391 
392 	dir_eps = debugfs_create_dir("eps", ssusb->dbgfs_root);
393 
394 	for (i = 1; i < mtu->num_eps; i++) {
395 		mtu3_debugfs_create_ep_dir(mtu->in_eps + i, dir_eps);
396 		mtu3_debugfs_create_ep_dir(mtu->out_eps + i, dir_eps);
397 	}
398 }
399 
400 void ssusb_dev_debugfs_init(struct ssusb_mtk *ssusb)
401 {
402 	struct mtu3 *mtu = ssusb->u3d;
403 	struct dentry *dir_regs;
404 
405 	dir_regs = debugfs_create_dir("regs", ssusb->dbgfs_root);
406 
407 	mtu3_debugfs_regset(mtu, mtu->ippc_base,
408 			    mtu3_ippc_regs, ARRAY_SIZE(mtu3_ippc_regs),
409 			    "reg-ippc", dir_regs);
410 
411 	mtu3_debugfs_regset(mtu, mtu->mac_base,
412 			    mtu3_dev_regs, ARRAY_SIZE(mtu3_dev_regs),
413 			    "reg-dev", dir_regs);
414 
415 	mtu3_debugfs_regset(mtu, mtu->mac_base,
416 			    mtu3_csr_regs, ARRAY_SIZE(mtu3_csr_regs),
417 			    "reg-csr", dir_regs);
418 
419 	mtu3_debugfs_create_ep_dirs(mtu);
420 
421 	mtu3_debugfs_create_prb_files(mtu);
422 
423 	debugfs_create_file("link-state", 0444, ssusb->dbgfs_root,
424 			    mtu, &mtu3_link_state_fops);
425 	debugfs_create_file("ep-used", 0444, ssusb->dbgfs_root,
426 			    mtu, &mtu3_ep_used_fops);
427 }
428 
429 static int ssusb_mode_show(struct seq_file *sf, void *unused)
430 {
431 	struct ssusb_mtk *ssusb = sf->private;
432 
433 	seq_printf(sf, "current mode: %s(%s drd)\n(echo device/host)\n",
434 		   ssusb->is_host ? "host" : "device",
435 		   ssusb->otg_switch.manual_drd_enabled ? "manual" : "auto");
436 
437 	return 0;
438 }
439 
440 static int ssusb_mode_open(struct inode *inode, struct file *file)
441 {
442 	return single_open(file, ssusb_mode_show, inode->i_private);
443 }
444 
445 static ssize_t ssusb_mode_write(struct file *file, const char __user *ubuf,
446 				size_t count, loff_t *ppos)
447 {
448 	struct seq_file *sf = file->private_data;
449 	struct ssusb_mtk *ssusb = sf->private;
450 	char buf[16];
451 
452 	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
453 		return -EFAULT;
454 
455 	if (!strncmp(buf, "host", 4) && !ssusb->is_host) {
456 		ssusb_mode_switch(ssusb, 1);
457 	} else if (!strncmp(buf, "device", 6) && ssusb->is_host) {
458 		ssusb_mode_switch(ssusb, 0);
459 	} else {
460 		dev_err(ssusb->dev, "wrong or duplicated setting\n");
461 		return -EINVAL;
462 	}
463 
464 	return count;
465 }
466 
467 static const struct file_operations ssusb_mode_fops = {
468 	.open = ssusb_mode_open,
469 	.write = ssusb_mode_write,
470 	.read = seq_read,
471 	.llseek = seq_lseek,
472 	.release = single_release,
473 };
474 
475 static int ssusb_vbus_show(struct seq_file *sf, void *unused)
476 {
477 	struct ssusb_mtk *ssusb = sf->private;
478 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
479 
480 	seq_printf(sf, "vbus state: %s\n(echo on/off)\n",
481 		   regulator_is_enabled(otg_sx->vbus) ? "on" : "off");
482 
483 	return 0;
484 }
485 
486 static int ssusb_vbus_open(struct inode *inode, struct file *file)
487 {
488 	return single_open(file, ssusb_vbus_show, inode->i_private);
489 }
490 
491 static ssize_t ssusb_vbus_write(struct file *file, const char __user *ubuf,
492 				size_t count, loff_t *ppos)
493 {
494 	struct seq_file *sf = file->private_data;
495 	struct ssusb_mtk *ssusb = sf->private;
496 	struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
497 	char buf[16];
498 	bool enable;
499 
500 	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
501 		return -EFAULT;
502 
503 	if (kstrtobool(buf, &enable)) {
504 		dev_err(ssusb->dev, "wrong setting\n");
505 		return -EINVAL;
506 	}
507 
508 	ssusb_set_vbus(otg_sx, enable);
509 
510 	return count;
511 }
512 
513 static const struct file_operations ssusb_vbus_fops = {
514 	.open = ssusb_vbus_open,
515 	.write = ssusb_vbus_write,
516 	.read = seq_read,
517 	.llseek = seq_lseek,
518 	.release = single_release,
519 };
520 
521 void ssusb_dr_debugfs_init(struct ssusb_mtk *ssusb)
522 {
523 	struct dentry *root = ssusb->dbgfs_root;
524 
525 	debugfs_create_file("mode", 0644, root, ssusb, &ssusb_mode_fops);
526 	debugfs_create_file("vbus", 0644, root, ssusb, &ssusb_vbus_fops);
527 }
528 
529 void ssusb_debugfs_create_root(struct ssusb_mtk *ssusb)
530 {
531 	ssusb->dbgfs_root =
532 		debugfs_create_dir(dev_name(ssusb->dev), usb_debug_root);
533 }
534 
535 void ssusb_debugfs_remove_root(struct ssusb_mtk *ssusb)
536 {
537 	debugfs_remove_recursive(ssusb->dbgfs_root);
538 	ssusb->dbgfs_root = NULL;
539 }
540