aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/musb/musb_virthub.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/musb/musb_virthub.c')
-rw-r--r--drivers/usb/musb/musb_virthub.c425
1 files changed, 425 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
new file mode 100644
index 000000000000..e0e9ce584175
--- /dev/null
+++ b/drivers/usb/musb/musb_virthub.c
@@ -0,0 +1,425 @@
1/*
2 * MUSB OTG driver virtual root hub support
3 *
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
25 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
28 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
29 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35#include <linux/module.h>
36#include <linux/kernel.h>
37#include <linux/sched.h>
38#include <linux/slab.h>
39#include <linux/errno.h>
40#include <linux/init.h>
41#include <linux/time.h>
42#include <linux/timer.h>
43
44#include <asm/unaligned.h>
45
46#include "musb_core.h"
47
48
49static void musb_port_suspend(struct musb *musb, bool do_suspend)
50{
51 u8 power;
52 void __iomem *mbase = musb->mregs;
53
54 if (!is_host_active(musb))
55 return;
56
57 /* NOTE: this doesn't necessarily put PHY into low power mode,
58 * turning off its clock; that's a function of PHY integration and
59 * MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
60 * SE0 changing to connect (J) or wakeup (K) states.
61 */
62 power = musb_readb(mbase, MUSB_POWER);
63 if (do_suspend) {
64 int retries = 10000;
65
66 power &= ~MUSB_POWER_RESUME;
67 power |= MUSB_POWER_SUSPENDM;
68 musb_writeb(mbase, MUSB_POWER, power);
69
70 /* Needed for OPT A tests */
71 power = musb_readb(mbase, MUSB_POWER);
72 while (power & MUSB_POWER_SUSPENDM) {
73 power = musb_readb(mbase, MUSB_POWER);
74 if (retries-- < 1)
75 break;
76 }
77
78 DBG(3, "Root port suspended, power %02x\n", power);
79
80 musb->port1_status |= USB_PORT_STAT_SUSPEND;
81 switch (musb->xceiv.state) {
82 case OTG_STATE_A_HOST:
83 musb->xceiv.state = OTG_STATE_A_SUSPEND;
84 musb->is_active = is_otg_enabled(musb)
85 && musb->xceiv.host->b_hnp_enable;
86 musb_platform_try_idle(musb, 0);
87 break;
88#ifdef CONFIG_USB_MUSB_OTG
89 case OTG_STATE_B_HOST:
90 musb->xceiv.state = OTG_STATE_B_WAIT_ACON;
91 musb->is_active = is_otg_enabled(musb)
92 && musb->xceiv.host->b_hnp_enable;
93 musb_platform_try_idle(musb, 0);
94 break;
95#endif
96 default:
97 DBG(1, "bogus rh suspend? %s\n",
98 otg_state_string(musb));
99 }
100 } else if (power & MUSB_POWER_SUSPENDM) {
101 power &= ~MUSB_POWER_SUSPENDM;
102 power |= MUSB_POWER_RESUME;
103 musb_writeb(mbase, MUSB_POWER, power);
104
105 DBG(3, "Root port resuming, power %02x\n", power);
106
107 /* later, GetPortStatus will stop RESUME signaling */
108 musb->port1_status |= MUSB_PORT_STAT_RESUME;
109 musb->rh_timer = jiffies + msecs_to_jiffies(20);
110 }
111}
112
113static void musb_port_reset(struct musb *musb, bool do_reset)
114{
115 u8 power;
116 void __iomem *mbase = musb->mregs;
117
118#ifdef CONFIG_USB_MUSB_OTG
119 if (musb->xceiv.state == OTG_STATE_B_IDLE) {
120 DBG(2, "HNP: Returning from HNP; no hub reset from b_idle\n");
121 musb->port1_status &= ~USB_PORT_STAT_RESET;
122 return;
123 }
124#endif
125
126 if (!is_host_active(musb))
127 return;
128
129 /* NOTE: caller guarantees it will turn off the reset when
130 * the appropriate amount of time has passed
131 */
132 power = musb_readb(mbase, MUSB_POWER);
133 if (do_reset) {
134
135 /*
136 * If RESUME is set, we must make sure it stays minimum 20 ms.
137 * Then we must clear RESUME and wait a bit to let musb start
138 * generating SOFs. If we don't do this, OPT HS A 6.8 tests
139 * fail with "Error! Did not receive an SOF before suspend
140 * detected".
141 */
142 if (power & MUSB_POWER_RESUME) {
143 while (time_before(jiffies, musb->rh_timer))
144 msleep(1);
145 musb_writeb(mbase, MUSB_POWER,
146 power & ~MUSB_POWER_RESUME);
147 msleep(1);
148 }
149
150 musb->ignore_disconnect = true;
151 power &= 0xf0;
152 musb_writeb(mbase, MUSB_POWER,
153 power | MUSB_POWER_RESET);
154
155 musb->port1_status |= USB_PORT_STAT_RESET;
156 musb->port1_status &= ~USB_PORT_STAT_ENABLE;
157 musb->rh_timer = jiffies + msecs_to_jiffies(50);
158 } else {
159 DBG(4, "root port reset stopped\n");
160 musb_writeb(mbase, MUSB_POWER,
161 power & ~MUSB_POWER_RESET);
162
163 musb->ignore_disconnect = false;
164
165 power = musb_readb(mbase, MUSB_POWER);
166 if (power & MUSB_POWER_HSMODE) {
167 DBG(4, "high-speed device connected\n");
168 musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
169 }
170
171 musb->port1_status &= ~USB_PORT_STAT_RESET;
172 musb->port1_status |= USB_PORT_STAT_ENABLE
173 | (USB_PORT_STAT_C_RESET << 16)
174 | (USB_PORT_STAT_C_ENABLE << 16);
175 usb_hcd_poll_rh_status(musb_to_hcd(musb));
176
177 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
178 }
179}
180
181void musb_root_disconnect(struct musb *musb)
182{
183 musb->port1_status = (1 << USB_PORT_FEAT_POWER)
184 | (1 << USB_PORT_FEAT_C_CONNECTION);
185
186 usb_hcd_poll_rh_status(musb_to_hcd(musb));
187 musb->is_active = 0;
188
189 switch (musb->xceiv.state) {
190 case OTG_STATE_A_HOST:
191 case OTG_STATE_A_SUSPEND:
192 musb->xceiv.state = OTG_STATE_A_WAIT_BCON;
193 musb->is_active = 0;
194 break;
195 case OTG_STATE_A_WAIT_VFALL:
196 musb->xceiv.state = OTG_STATE_B_IDLE;
197 break;
198 default:
199 DBG(1, "host disconnect (%s)\n", otg_state_string(musb));
200 }
201}
202
203
204/*---------------------------------------------------------------------*/
205
206/* Caller may or may not hold musb->lock */
207int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
208{
209 struct musb *musb = hcd_to_musb(hcd);
210 int retval = 0;
211
212 /* called in_irq() via usb_hcd_poll_rh_status() */
213 if (musb->port1_status & 0xffff0000) {
214 *buf = 0x02;
215 retval = 1;
216 }
217 return retval;
218}
219
220int musb_hub_control(
221 struct usb_hcd *hcd,
222 u16 typeReq,
223 u16 wValue,
224 u16 wIndex,
225 char *buf,
226 u16 wLength)
227{
228 struct musb *musb = hcd_to_musb(hcd);
229 u32 temp;
230 int retval = 0;
231 unsigned long flags;
232
233 spin_lock_irqsave(&musb->lock, flags);
234
235 if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) {
236 spin_unlock_irqrestore(&musb->lock, flags);
237 return -ESHUTDOWN;
238 }
239
240 /* hub features: always zero, setting is a NOP
241 * port features: reported, sometimes updated when host is active
242 * no indicators
243 */
244 switch (typeReq) {
245 case ClearHubFeature:
246 case SetHubFeature:
247 switch (wValue) {
248 case C_HUB_OVER_CURRENT:
249 case C_HUB_LOCAL_POWER:
250 break;
251 default:
252 goto error;
253 }
254 break;
255 case ClearPortFeature:
256 if ((wIndex & 0xff) != 1)
257 goto error;
258
259 switch (wValue) {
260 case USB_PORT_FEAT_ENABLE:
261 break;
262 case USB_PORT_FEAT_SUSPEND:
263 musb_port_suspend(musb, false);
264 break;
265 case USB_PORT_FEAT_POWER:
266 if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
267 musb_set_vbus(musb, 0);
268 break;
269 case USB_PORT_FEAT_C_CONNECTION:
270 case USB_PORT_FEAT_C_ENABLE:
271 case USB_PORT_FEAT_C_OVER_CURRENT:
272 case USB_PORT_FEAT_C_RESET:
273 case USB_PORT_FEAT_C_SUSPEND:
274 break;
275 default:
276 goto error;
277 }
278 DBG(5, "clear feature %d\n", wValue);
279 musb->port1_status &= ~(1 << wValue);
280 break;
281 case GetHubDescriptor:
282 {
283 struct usb_hub_descriptor *desc = (void *)buf;
284
285 desc->bDescLength = 9;
286 desc->bDescriptorType = 0x29;
287 desc->bNbrPorts = 1;
288 desc->wHubCharacteristics = __constant_cpu_to_le16(
289 0x0001 /* per-port power switching */
290 | 0x0010 /* no overcurrent reporting */
291 );
292 desc->bPwrOn2PwrGood = 5; /* msec/2 */
293 desc->bHubContrCurrent = 0;
294
295 /* workaround bogus struct definition */
296 desc->DeviceRemovable[0] = 0x02; /* port 1 */
297 desc->DeviceRemovable[1] = 0xff;
298 }
299 break;
300 case GetHubStatus:
301 temp = 0;
302 *(__le32 *) buf = cpu_to_le32(temp);
303 break;
304 case GetPortStatus:
305 if (wIndex != 1)
306 goto error;
307
308 /* finish RESET signaling? */
309 if ((musb->port1_status & USB_PORT_STAT_RESET)
310 && time_after_eq(jiffies, musb->rh_timer))
311 musb_port_reset(musb, false);
312
313 /* finish RESUME signaling? */
314 if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
315 && time_after_eq(jiffies, musb->rh_timer)) {
316 u8 power;
317
318 power = musb_readb(musb->mregs, MUSB_POWER);
319 power &= ~MUSB_POWER_RESUME;
320 DBG(4, "root port resume stopped, power %02x\n",
321 power);
322 musb_writeb(musb->mregs, MUSB_POWER, power);
323
324 /* ISSUE: DaVinci (RTL 1.300) disconnects after
325 * resume of high speed peripherals (but not full
326 * speed ones).
327 */
328
329 musb->is_active = 1;
330 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
331 | MUSB_PORT_STAT_RESUME);
332 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
333 usb_hcd_poll_rh_status(musb_to_hcd(musb));
334 /* NOTE: it might really be A_WAIT_BCON ... */
335 musb->xceiv.state = OTG_STATE_A_HOST;
336 }
337
338 put_unaligned(cpu_to_le32(musb->port1_status
339 & ~MUSB_PORT_STAT_RESUME),
340 (__le32 *) buf);
341
342 /* port change status is more interesting */
343 DBG(get_unaligned((u16 *)(buf+2)) ? 2 : 5, "port status %08x\n",
344 musb->port1_status);
345 break;
346 case SetPortFeature:
347 if ((wIndex & 0xff) != 1)
348 goto error;
349
350 switch (wValue) {
351 case USB_PORT_FEAT_POWER:
352 /* NOTE: this controller has a strange state machine
353 * that involves "requesting sessions" according to
354 * magic side effects from incompletely-described
355 * rules about startup...
356 *
357 * This call is what really starts the host mode; be
358 * very careful about side effects if you reorder any
359 * initialization logic, e.g. for OTG, or change any
360 * logic relating to VBUS power-up.
361 */
362 if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
363 musb_start(musb);
364 break;
365 case USB_PORT_FEAT_RESET:
366 musb_port_reset(musb, true);
367 break;
368 case USB_PORT_FEAT_SUSPEND:
369 musb_port_suspend(musb, true);
370 break;
371 case USB_PORT_FEAT_TEST:
372 if (unlikely(is_host_active(musb)))
373 goto error;
374
375 wIndex >>= 8;
376 switch (wIndex) {
377 case 1:
378 pr_debug("TEST_J\n");
379 temp = MUSB_TEST_J;
380 break;
381 case 2:
382 pr_debug("TEST_K\n");
383 temp = MUSB_TEST_K;
384 break;
385 case 3:
386 pr_debug("TEST_SE0_NAK\n");
387 temp = MUSB_TEST_SE0_NAK;
388 break;
389 case 4:
390 pr_debug("TEST_PACKET\n");
391 temp = MUSB_TEST_PACKET;
392 musb_load_testpacket(musb);
393 break;
394 case 5:
395 pr_debug("TEST_FORCE_ENABLE\n");
396 temp = MUSB_TEST_FORCE_HOST
397 | MUSB_TEST_FORCE_HS;
398
399 musb_writeb(musb->mregs, MUSB_DEVCTL,
400 MUSB_DEVCTL_SESSION);
401 break;
402 case 6:
403 pr_debug("TEST_FIFO_ACCESS\n");
404 temp = MUSB_TEST_FIFO_ACCESS;
405 break;
406 default:
407 goto error;
408 }
409 musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
410 break;
411 default:
412 goto error;
413 }
414 DBG(5, "set feature %d\n", wValue);
415 musb->port1_status |= 1 << wValue;
416 break;
417
418 default:
419error:
420 /* "protocol stall" on error */
421 retval = -EPIPE;
422 }
423 spin_unlock_irqrestore(&musb->lock, flags);
424 return retval;
425}
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-09 11:41:04 -0500