1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * MUSB OTG driver debugfs support
4  *
5  * Copyright 2010 Nokia Corporation
6  * Contact: Felipe Balbi <felipe.balbi@nokia.com>
7  */
8 
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/debugfs.h>
13 #include <linux/seq_file.h>
14 
15 #include <linux/uaccess.h>
16 
17 #include "musb_core.h"
18 #include "musb_debug.h"
19 
20 struct musb_register_map {
21 	char			*name;
22 	unsigned		offset;
23 	unsigned		size;
24 };
25 
26 static const struct musb_register_map musb_regmap[] = {
27 	{ "FAddr",	MUSB_FADDR,	8 },
28 	{ "Power",	MUSB_POWER,	8 },
29 	{ "Frame",	MUSB_FRAME,	16 },
30 	{ "Index",	MUSB_INDEX,	8 },
31 	{ "Testmode",	MUSB_TESTMODE,	8 },
32 	{ "TxMaxPp",	MUSB_TXMAXP,	16 },
33 	{ "TxCSRp",	MUSB_TXCSR,	16 },
34 	{ "RxMaxPp",	MUSB_RXMAXP,	16 },
35 	{ "RxCSR",	MUSB_RXCSR,	16 },
36 	{ "RxCount",	MUSB_RXCOUNT,	16 },
37 	{ "IntrRxE",	MUSB_INTRRXE,	16 },
38 	{ "IntrTxE",	MUSB_INTRTXE,	16 },
39 	{ "IntrUsbE",	MUSB_INTRUSBE,	8 },
40 	{ "DevCtl",	MUSB_DEVCTL,	8 },
41 	{ "VControl",	0x68,		32 },
42 	{ "HWVers",	0x69,		16 },
43 	{ "LinkInfo",	MUSB_LINKINFO,	8 },
44 	{ "VPLen",	MUSB_VPLEN,	8 },
45 	{ "HS_EOF1",	MUSB_HS_EOF1,	8 },
46 	{ "FS_EOF1",	MUSB_FS_EOF1,	8 },
47 	{ "LS_EOF1",	MUSB_LS_EOF1,	8 },
48 	{ "SOFT_RST",	0x7F,		8 },
49 	{ "DMA_CNTLch0",	0x204,	16 },
50 	{ "DMA_ADDRch0",	0x208,	32 },
51 	{ "DMA_COUNTch0",	0x20C,	32 },
52 	{ "DMA_CNTLch1",	0x214,	16 },
53 	{ "DMA_ADDRch1",	0x218,	32 },
54 	{ "DMA_COUNTch1",	0x21C,	32 },
55 	{ "DMA_CNTLch2",	0x224,	16 },
56 	{ "DMA_ADDRch2",	0x228,	32 },
57 	{ "DMA_COUNTch2",	0x22C,	32 },
58 	{ "DMA_CNTLch3",	0x234,	16 },
59 	{ "DMA_ADDRch3",	0x238,	32 },
60 	{ "DMA_COUNTch3",	0x23C,	32 },
61 	{ "DMA_CNTLch4",	0x244,	16 },
62 	{ "DMA_ADDRch4",	0x248,	32 },
63 	{ "DMA_COUNTch4",	0x24C,	32 },
64 	{ "DMA_CNTLch5",	0x254,	16 },
65 	{ "DMA_ADDRch5",	0x258,	32 },
66 	{ "DMA_COUNTch5",	0x25C,	32 },
67 	{ "DMA_CNTLch6",	0x264,	16 },
68 	{ "DMA_ADDRch6",	0x268,	32 },
69 	{ "DMA_COUNTch6",	0x26C,	32 },
70 	{ "DMA_CNTLch7",	0x274,	16 },
71 	{ "DMA_ADDRch7",	0x278,	32 },
72 	{ "DMA_COUNTch7",	0x27C,	32 },
73 	{ "ConfigData",	MUSB_CONFIGDATA,8 },
74 	{ "BabbleCtl",	MUSB_BABBLE_CTL,8 },
75 	{ "TxFIFOsz",	MUSB_TXFIFOSZ,	8 },
76 	{ "RxFIFOsz",	MUSB_RXFIFOSZ,	8 },
77 	{ "TxFIFOadd",	MUSB_TXFIFOADD,	16 },
78 	{ "RxFIFOadd",	MUSB_RXFIFOADD,	16 },
79 	{ "EPInfo",	MUSB_EPINFO,	8 },
80 	{ "RAMInfo",	MUSB_RAMINFO,	8 },
81 	{  }	/* Terminating Entry */
82 };
83 
musb_regdump_show(struct seq_file * s,void * unused)84 static int musb_regdump_show(struct seq_file *s, void *unused)
85 {
86 	struct musb		*musb = s->private;
87 	unsigned		i;
88 
89 	seq_printf(s, "MUSB (M)HDRC Register Dump\n");
90 	pm_runtime_get_sync(musb->controller);
91 
92 	for (i = 0; i < ARRAY_SIZE(musb_regmap); i++) {
93 		switch (musb_regmap[i].size) {
94 		case 8:
95 			seq_printf(s, "%-12s: %02x\n", musb_regmap[i].name,
96 					musb_readb(musb->mregs, musb_regmap[i].offset));
97 			break;
98 		case 16:
99 			seq_printf(s, "%-12s: %04x\n", musb_regmap[i].name,
100 					musb_readw(musb->mregs, musb_regmap[i].offset));
101 			break;
102 		case 32:
103 			seq_printf(s, "%-12s: %08x\n", musb_regmap[i].name,
104 					musb_readl(musb->mregs, musb_regmap[i].offset));
105 			break;
106 		}
107 	}
108 
109 	pm_runtime_mark_last_busy(musb->controller);
110 	pm_runtime_put_autosuspend(musb->controller);
111 	return 0;
112 }
113 DEFINE_SHOW_ATTRIBUTE(musb_regdump);
114 
musb_test_mode_show(struct seq_file * s,void * unused)115 static int musb_test_mode_show(struct seq_file *s, void *unused)
116 {
117 	struct musb		*musb = s->private;
118 	unsigned		test;
119 
120 	pm_runtime_get_sync(musb->controller);
121 	test = musb_readb(musb->mregs, MUSB_TESTMODE);
122 	pm_runtime_mark_last_busy(musb->controller);
123 	pm_runtime_put_autosuspend(musb->controller);
124 
125 	if (test == (MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_FS))
126 		seq_printf(s, "force host full-speed\n");
127 
128 	else if (test == (MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_HS))
129 		seq_printf(s, "force host high-speed\n");
130 
131 	else if (test == MUSB_TEST_FORCE_HOST)
132 		seq_printf(s, "force host\n");
133 
134 	else if (test == MUSB_TEST_FIFO_ACCESS)
135 		seq_printf(s, "fifo access\n");
136 
137 	else if (test == MUSB_TEST_FORCE_FS)
138 		seq_printf(s, "force full-speed\n");
139 
140 	else if (test == MUSB_TEST_FORCE_HS)
141 		seq_printf(s, "force high-speed\n");
142 
143 	else if (test == MUSB_TEST_PACKET)
144 		seq_printf(s, "test packet\n");
145 
146 	else if (test == MUSB_TEST_K)
147 		seq_printf(s, "test K\n");
148 
149 	else if (test == MUSB_TEST_J)
150 		seq_printf(s, "test J\n");
151 
152 	else if (test == MUSB_TEST_SE0_NAK)
153 		seq_printf(s, "test SE0 NAK\n");
154 
155 	return 0;
156 }
157 
musb_test_mode_open(struct inode * inode,struct file * file)158 static int musb_test_mode_open(struct inode *inode, struct file *file)
159 {
160 	return single_open(file, musb_test_mode_show, inode->i_private);
161 }
162 
musb_test_mode_write(struct file * file,const char __user * ubuf,size_t count,loff_t * ppos)163 static ssize_t musb_test_mode_write(struct file *file,
164 		const char __user *ubuf, size_t count, loff_t *ppos)
165 {
166 	struct seq_file		*s = file->private_data;
167 	struct musb		*musb = s->private;
168 	u8			test;
169 	char			buf[24];
170 
171 	memset(buf, 0x00, sizeof(buf));
172 
173 	if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
174 		return -EFAULT;
175 
176 	pm_runtime_get_sync(musb->controller);
177 	test = musb_readb(musb->mregs, MUSB_TESTMODE);
178 	if (test) {
179 		dev_err(musb->controller, "Error: test mode is already set. "
180 			"Please do USB Bus Reset to start a new test.\n");
181 		goto ret;
182 	}
183 
184 	if (strstarts(buf, "force host full-speed"))
185 		test = MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_FS;
186 
187 	else if (strstarts(buf, "force host high-speed"))
188 		test = MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_HS;
189 
190 	else if (strstarts(buf, "force host"))
191 		test = MUSB_TEST_FORCE_HOST;
192 
193 	else if (strstarts(buf, "fifo access"))
194 		test = MUSB_TEST_FIFO_ACCESS;
195 
196 	else if (strstarts(buf, "force full-speed"))
197 		test = MUSB_TEST_FORCE_FS;
198 
199 	else if (strstarts(buf, "force high-speed"))
200 		test = MUSB_TEST_FORCE_HS;
201 
202 	else if (strstarts(buf, "test packet")) {
203 		test = MUSB_TEST_PACKET;
204 		musb_load_testpacket(musb);
205 	}
206 
207 	else if (strstarts(buf, "test K"))
208 		test = MUSB_TEST_K;
209 
210 	else if (strstarts(buf, "test J"))
211 		test = MUSB_TEST_J;
212 
213 	else if (strstarts(buf, "test SE0 NAK"))
214 		test = MUSB_TEST_SE0_NAK;
215 
216 	musb_writeb(musb->mregs, MUSB_TESTMODE, test);
217 
218 ret:
219 	pm_runtime_mark_last_busy(musb->controller);
220 	pm_runtime_put_autosuspend(musb->controller);
221 	return count;
222 }
223 
224 static const struct file_operations musb_test_mode_fops = {
225 	.open			= musb_test_mode_open,
226 	.write			= musb_test_mode_write,
227 	.read			= seq_read,
228 	.llseek			= seq_lseek,
229 	.release		= single_release,
230 };
231 
musb_softconnect_show(struct seq_file * s,void * unused)232 static int musb_softconnect_show(struct seq_file *s, void *unused)
233 {
234 	struct musb	*musb = s->private;
235 	u8		reg;
236 	int		connect;
237 
238 	switch (musb->xceiv->otg->state) {
239 	case OTG_STATE_A_HOST:
240 	case OTG_STATE_A_WAIT_BCON:
241 		pm_runtime_get_sync(musb->controller);
242 
243 		reg = musb_readb(musb->mregs, MUSB_DEVCTL);
244 		connect = reg & MUSB_DEVCTL_SESSION ? 1 : 0;
245 
246 		pm_runtime_mark_last_busy(musb->controller);
247 		pm_runtime_put_autosuspend(musb->controller);
248 		break;
249 	default:
250 		connect = -1;
251 	}
252 
253 	seq_printf(s, "%d\n", connect);
254 
255 	return 0;
256 }
257 
musb_softconnect_open(struct inode * inode,struct file * file)258 static int musb_softconnect_open(struct inode *inode, struct file *file)
259 {
260 	return single_open(file, musb_softconnect_show, inode->i_private);
261 }
262 
musb_softconnect_write(struct file * file,const char __user * ubuf,size_t count,loff_t * ppos)263 static ssize_t musb_softconnect_write(struct file *file,
264 		const char __user *ubuf, size_t count, loff_t *ppos)
265 {
266 	struct seq_file		*s = file->private_data;
267 	struct musb		*musb = s->private;
268 	char			buf[2];
269 	u8			reg;
270 
271 	memset(buf, 0x00, sizeof(buf));
272 
273 	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
274 		return -EFAULT;
275 
276 	pm_runtime_get_sync(musb->controller);
277 	if (!strncmp(buf, "0", 1)) {
278 		switch (musb->xceiv->otg->state) {
279 		case OTG_STATE_A_HOST:
280 			musb_root_disconnect(musb);
281 			reg = musb_readb(musb->mregs, MUSB_DEVCTL);
282 			reg &= ~MUSB_DEVCTL_SESSION;
283 			musb_writeb(musb->mregs, MUSB_DEVCTL, reg);
284 			break;
285 		default:
286 			break;
287 		}
288 	} else if (!strncmp(buf, "1", 1)) {
289 		switch (musb->xceiv->otg->state) {
290 		case OTG_STATE_A_WAIT_BCON:
291 			/*
292 			 * musb_save_context() called in musb_runtime_suspend()
293 			 * might cache devctl with SESSION bit cleared during
294 			 * soft-disconnect, so specifically set SESSION bit
295 			 * here to preserve it for musb_runtime_resume().
296 			 */
297 			musb->context.devctl |= MUSB_DEVCTL_SESSION;
298 			reg = musb_readb(musb->mregs, MUSB_DEVCTL);
299 			reg |= MUSB_DEVCTL_SESSION;
300 			musb_writeb(musb->mregs, MUSB_DEVCTL, reg);
301 			break;
302 		default:
303 			break;
304 		}
305 	}
306 
307 	pm_runtime_mark_last_busy(musb->controller);
308 	pm_runtime_put_autosuspend(musb->controller);
309 	return count;
310 }
311 
312 /*
313  * In host mode, connect/disconnect the bus without physically
314  * remove the devices.
315  */
316 static const struct file_operations musb_softconnect_fops = {
317 	.open			= musb_softconnect_open,
318 	.write			= musb_softconnect_write,
319 	.read			= seq_read,
320 	.llseek			= seq_lseek,
321 	.release		= single_release,
322 };
323 
musb_init_debugfs(struct musb * musb)324 void musb_init_debugfs(struct musb *musb)
325 {
326 	struct dentry *root;
327 
328 	root = debugfs_create_dir(dev_name(musb->controller), usb_debug_root);
329 	musb->debugfs_root = root;
330 
331 	debugfs_create_file("regdump", S_IRUGO, root, musb, &musb_regdump_fops);
332 	debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root, musb,
333 			    &musb_test_mode_fops);
334 	debugfs_create_file("softconnect", S_IRUGO | S_IWUSR, root, musb,
335 			    &musb_softconnect_fops);
336 }
337 
musb_exit_debugfs(struct musb * musb)338 void /* __init_or_exit */ musb_exit_debugfs(struct musb *musb)
339 {
340 	debugfs_remove_recursive(musb->debugfs_root);
341 }
342