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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 */
24static 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}
48DEFINE_SHOW_ATTRIBUTE(ci_device);
49
50/*
51 * ci_port_test_show: reads port test mode
52 */
53static 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 */
73static 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
105static 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
110static 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 */
121static 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}
148DEFINE_SHOW_ATTRIBUTE(ci_qheads);
149
150/*
151 * ci_requests_show: DMA contents of all requests currently queued (all endpts)
152 */
153static 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}
185DEFINE_SHOW_ATTRIBUTE(ci_requests);
186
187static 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}
248DEFINE_SHOW_ATTRIBUTE(ci_otg);
249
250static int ci_registers_show(struct seq_file *s, void *unused)
251{
252 struct ci_hdrc *ci = s->private;
253 u32 tmp_reg;
254
255 if (!ci || ci->in_lpm)
256 return -EPERM;
257
258 /* ------ Registers ----- */
259 tmp_reg = hw_read_intr_enable(ci);
260 seq_printf(s, "USBINTR reg: %08x\n", tmp_reg);
261
262 tmp_reg = hw_read_intr_status(ci);
263 seq_printf(s, "USBSTS reg: %08x\n", tmp_reg);
264
265 tmp_reg = hw_read(ci, OP_USBMODE, ~0);
266 seq_printf(s, "USBMODE reg: %08x\n", tmp_reg);
267
268 tmp_reg = hw_read(ci, OP_USBCMD, ~0);
269 seq_printf(s, "USBCMD reg: %08x\n", tmp_reg);
270
271 tmp_reg = hw_read(ci, OP_PORTSC, ~0);
272 seq_printf(s, "PORTSC reg: %08x\n", tmp_reg);
273
274 if (ci->is_otg) {
275 tmp_reg = hw_read_otgsc(ci, ~0);
276 seq_printf(s, "OTGSC reg: %08x\n", tmp_reg);
277 }
278
279 return 0;
280}
281DEFINE_SHOW_ATTRIBUTE(ci_registers);
282
283/**
284 * dbg_create_files: initializes the attribute interface
285 * @ci: device
286 *
287 * This function returns an error code
288 */
289void dbg_create_files(struct ci_hdrc *ci)
290{
291 struct dentry *dir;
292
293 dir = debugfs_create_dir(dev_name(ci->dev), usb_debug_root);
294
295 debugfs_create_file("device", S_IRUGO, dir, ci, &ci_device_fops);
296 debugfs_create_file("port_test", S_IRUGO | S_IWUSR, dir, ci, &ci_port_test_fops);
297 debugfs_create_file("qheads", S_IRUGO, dir, ci, &ci_qheads_fops);
298 debugfs_create_file("requests", S_IRUGO, dir, ci, &ci_requests_fops);
299
300 if (ci_otg_is_fsm_mode(ci))
301 debugfs_create_file("otg", S_IRUGO, dir, ci, &ci_otg_fops);
302
303 debugfs_create_file("registers", S_IRUGO, dir, ci, &ci_registers_fops);
304}
305
306/**
307 * dbg_remove_files: destroys the attribute interface
308 * @ci: device
309 */
310void dbg_remove_files(struct ci_hdrc *ci)
311{
312 debugfs_lookup_and_remove(dev_name(ci->dev), usb_debug_root);
313}