2 * MUSB OTG driver virtual root hub support
4 * Copyright 2005 Mentor Graphics Corporation
5 * Copyright (C) 2005-2006 by Texas Instruments
6 * Copyright (C) 2006-2007 Nokia Corporation
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.
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.
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
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.
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/sched.h>
38 #include <linux/errno.h>
39 #include <linux/init.h>
40 #include <linux/time.h>
41 #include <linux/timer.h>
43 #include <asm/unaligned.h>
45 #include "musb_core.h"
48 static void musb_port_suspend(struct musb
*musb
, bool do_suspend
)
51 void __iomem
*mbase
= musb
->mregs
;
53 if (!is_host_active(musb
))
56 /* NOTE: this doesn't necessarily put PHY into low power mode,
57 * turning off its clock; that's a function of PHY integration and
58 * MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
59 * SE0 changing to connect (J) or wakeup (K) states.
61 power
= musb_readb(mbase
, MUSB_POWER
);
65 power
&= ~MUSB_POWER_RESUME
;
66 power
|= MUSB_POWER_SUSPENDM
;
67 musb_writeb(mbase
, MUSB_POWER
, power
);
69 /* Needed for OPT A tests */
70 power
= musb_readb(mbase
, MUSB_POWER
);
71 while (power
& MUSB_POWER_SUSPENDM
) {
72 power
= musb_readb(mbase
, MUSB_POWER
);
77 DBG(3, "Root port suspended, power %02x\n", power
);
79 musb
->port1_status
|= USB_PORT_STAT_SUSPEND
;
80 switch (musb
->xceiv
->state
) {
81 case OTG_STATE_A_HOST
:
82 musb
->xceiv
->state
= OTG_STATE_A_SUSPEND
;
83 musb
->is_active
= is_otg_enabled(musb
)
84 && musb
->xceiv
->host
->b_hnp_enable
;
86 mod_timer(&musb
->otg_timer
, jiffies
88 OTG_TIME_A_AIDL_BDIS
));
89 musb_platform_try_idle(musb
, 0);
91 #ifdef CONFIG_USB_MUSB_OTG
92 case OTG_STATE_B_HOST
:
93 musb
->xceiv
->state
= OTG_STATE_B_WAIT_ACON
;
94 musb
->is_active
= is_otg_enabled(musb
)
95 && musb
->xceiv
->host
->b_hnp_enable
;
96 musb_platform_try_idle(musb
, 0);
100 DBG(1, "bogus rh suspend? %s\n",
101 otg_state_string(musb
));
103 } else if (power
& MUSB_POWER_SUSPENDM
) {
104 power
&= ~MUSB_POWER_SUSPENDM
;
105 power
|= MUSB_POWER_RESUME
;
106 musb_writeb(mbase
, MUSB_POWER
, power
);
108 DBG(3, "Root port resuming, power %02x\n", power
);
110 /* later, GetPortStatus will stop RESUME signaling */
111 musb
->port1_status
|= MUSB_PORT_STAT_RESUME
;
112 musb
->rh_timer
= jiffies
+ msecs_to_jiffies(20);
116 static void musb_port_reset(struct musb
*musb
, bool do_reset
)
119 void __iomem
*mbase
= musb
->mregs
;
121 #ifdef CONFIG_USB_MUSB_OTG
122 if (musb
->xceiv
->state
== OTG_STATE_B_IDLE
) {
123 DBG(2, "HNP: Returning from HNP; no hub reset from b_idle\n");
124 musb
->port1_status
&= ~USB_PORT_STAT_RESET
;
129 if (!is_host_active(musb
))
132 /* NOTE: caller guarantees it will turn off the reset when
133 * the appropriate amount of time has passed
135 power
= musb_readb(mbase
, MUSB_POWER
);
139 * If RESUME is set, we must make sure it stays minimum 20 ms.
140 * Then we must clear RESUME and wait a bit to let musb start
141 * generating SOFs. If we don't do this, OPT HS A 6.8 tests
142 * fail with "Error! Did not receive an SOF before suspend
145 if (power
& MUSB_POWER_RESUME
) {
146 while (time_before(jiffies
, musb
->rh_timer
))
148 musb_writeb(mbase
, MUSB_POWER
,
149 power
& ~MUSB_POWER_RESUME
);
153 musb
->ignore_disconnect
= true;
155 musb_writeb(mbase
, MUSB_POWER
,
156 power
| MUSB_POWER_RESET
);
158 musb
->port1_status
|= USB_PORT_STAT_RESET
;
159 musb
->port1_status
&= ~USB_PORT_STAT_ENABLE
;
160 musb
->rh_timer
= jiffies
+ msecs_to_jiffies(50);
162 DBG(4, "root port reset stopped\n");
163 musb_writeb(mbase
, MUSB_POWER
,
164 power
& ~MUSB_POWER_RESET
);
166 musb
->ignore_disconnect
= false;
168 power
= musb_readb(mbase
, MUSB_POWER
);
169 if (power
& MUSB_POWER_HSMODE
) {
170 DBG(4, "high-speed device connected\n");
171 musb
->port1_status
|= USB_PORT_STAT_HIGH_SPEED
;
174 musb
->port1_status
&= ~USB_PORT_STAT_RESET
;
175 musb
->port1_status
|= USB_PORT_STAT_ENABLE
176 | (USB_PORT_STAT_C_RESET
<< 16)
177 | (USB_PORT_STAT_C_ENABLE
<< 16);
178 usb_hcd_poll_rh_status(musb_to_hcd(musb
));
180 musb
->vbuserr_retry
= VBUSERR_RETRY_COUNT
;
184 void musb_root_disconnect(struct musb
*musb
)
186 musb
->port1_status
= USB_PORT_STAT_POWER
187 | (USB_PORT_STAT_C_CONNECTION
<< 16);
189 usb_hcd_poll_rh_status(musb_to_hcd(musb
));
192 switch (musb
->xceiv
->state
) {
193 case OTG_STATE_A_SUSPEND
:
194 #ifdef CONFIG_USB_MUSB_OTG
195 if (is_otg_enabled(musb
)
196 && musb
->xceiv
->host
->b_hnp_enable
) {
197 musb
->xceiv
->state
= OTG_STATE_A_PERIPHERAL
;
198 musb
->g
.is_a_peripheral
= 1;
203 case OTG_STATE_A_HOST
:
204 musb
->xceiv
->state
= OTG_STATE_A_WAIT_BCON
;
207 case OTG_STATE_A_WAIT_VFALL
:
208 musb
->xceiv
->state
= OTG_STATE_B_IDLE
;
211 DBG(1, "host disconnect (%s)\n", otg_state_string(musb
));
216 /*---------------------------------------------------------------------*/
218 /* Caller may or may not hold musb->lock */
219 int musb_hub_status_data(struct usb_hcd
*hcd
, char *buf
)
221 struct musb
*musb
= hcd_to_musb(hcd
);
224 /* called in_irq() via usb_hcd_poll_rh_status() */
225 if (musb
->port1_status
& 0xffff0000) {
232 int musb_hub_control(
240 struct musb
*musb
= hcd_to_musb(hcd
);
245 spin_lock_irqsave(&musb
->lock
, flags
);
247 if (unlikely(!HCD_HW_ACCESSIBLE(hcd
))) {
248 spin_unlock_irqrestore(&musb
->lock
, flags
);
252 /* hub features: always zero, setting is a NOP
253 * port features: reported, sometimes updated when host is active
257 case ClearHubFeature
:
260 case C_HUB_OVER_CURRENT
:
261 case C_HUB_LOCAL_POWER
:
267 case ClearPortFeature
:
268 if ((wIndex
& 0xff) != 1)
272 case USB_PORT_FEAT_ENABLE
:
274 case USB_PORT_FEAT_SUSPEND
:
275 musb_port_suspend(musb
, false);
277 case USB_PORT_FEAT_POWER
:
278 if (!(is_otg_enabled(musb
) && hcd
->self
.is_b_host
))
279 musb_set_vbus(musb
, 0);
281 case USB_PORT_FEAT_C_CONNECTION
:
282 case USB_PORT_FEAT_C_ENABLE
:
283 case USB_PORT_FEAT_C_OVER_CURRENT
:
284 case USB_PORT_FEAT_C_RESET
:
285 case USB_PORT_FEAT_C_SUSPEND
:
290 DBG(5, "clear feature %d\n", wValue
);
291 musb
->port1_status
&= ~(1 << wValue
);
293 case GetHubDescriptor
:
295 struct usb_hub_descriptor
*desc
= (void *)buf
;
297 desc
->bDescLength
= 9;
298 desc
->bDescriptorType
= 0x29;
300 desc
->wHubCharacteristics
= cpu_to_le16(
301 0x0001 /* per-port power switching */
302 | 0x0010 /* no overcurrent reporting */
304 desc
->bPwrOn2PwrGood
= 5; /* msec/2 */
305 desc
->bHubContrCurrent
= 0;
307 /* workaround bogus struct definition */
308 desc
->DeviceRemovable
[0] = 0x02; /* port 1 */
309 desc
->DeviceRemovable
[1] = 0xff;
314 *(__le32
*) buf
= cpu_to_le32(temp
);
320 /* finish RESET signaling? */
321 if ((musb
->port1_status
& USB_PORT_STAT_RESET
)
322 && time_after_eq(jiffies
, musb
->rh_timer
))
323 musb_port_reset(musb
, false);
325 /* finish RESUME signaling? */
326 if ((musb
->port1_status
& MUSB_PORT_STAT_RESUME
)
327 && time_after_eq(jiffies
, musb
->rh_timer
)) {
330 power
= musb_readb(musb
->mregs
, MUSB_POWER
);
331 power
&= ~MUSB_POWER_RESUME
;
332 DBG(4, "root port resume stopped, power %02x\n",
334 musb_writeb(musb
->mregs
, MUSB_POWER
, power
);
336 /* ISSUE: DaVinci (RTL 1.300) disconnects after
337 * resume of high speed peripherals (but not full
342 musb
->port1_status
&= ~(USB_PORT_STAT_SUSPEND
343 | MUSB_PORT_STAT_RESUME
);
344 musb
->port1_status
|= USB_PORT_STAT_C_SUSPEND
<< 16;
345 usb_hcd_poll_rh_status(musb_to_hcd(musb
));
346 /* NOTE: it might really be A_WAIT_BCON ... */
347 musb
->xceiv
->state
= OTG_STATE_A_HOST
;
350 put_unaligned(cpu_to_le32(musb
->port1_status
351 & ~MUSB_PORT_STAT_RESUME
),
354 /* port change status is more interesting */
355 DBG(get_unaligned((u16
*)(buf
+2)) ? 2 : 5, "port status %08x\n",
359 if ((wIndex
& 0xff) != 1)
363 case USB_PORT_FEAT_POWER
:
364 /* NOTE: this controller has a strange state machine
365 * that involves "requesting sessions" according to
366 * magic side effects from incompletely-described
367 * rules about startup...
369 * This call is what really starts the host mode; be
370 * very careful about side effects if you reorder any
371 * initialization logic, e.g. for OTG, or change any
372 * logic relating to VBUS power-up.
374 if (!(is_otg_enabled(musb
) && hcd
->self
.is_b_host
))
377 case USB_PORT_FEAT_RESET
:
378 musb_port_reset(musb
, true);
380 case USB_PORT_FEAT_SUSPEND
:
381 musb_port_suspend(musb
, true);
383 case USB_PORT_FEAT_TEST
:
384 if (unlikely(is_host_active(musb
)))
390 pr_debug("TEST_J\n");
394 pr_debug("TEST_K\n");
398 pr_debug("TEST_SE0_NAK\n");
399 temp
= MUSB_TEST_SE0_NAK
;
402 pr_debug("TEST_PACKET\n");
403 temp
= MUSB_TEST_PACKET
;
404 musb_load_testpacket(musb
);
407 pr_debug("TEST_FORCE_ENABLE\n");
408 temp
= MUSB_TEST_FORCE_HOST
409 | MUSB_TEST_FORCE_HS
;
411 musb_writeb(musb
->mregs
, MUSB_DEVCTL
,
412 MUSB_DEVCTL_SESSION
);
415 pr_debug("TEST_FIFO_ACCESS\n");
416 temp
= MUSB_TEST_FIFO_ACCESS
;
421 musb_writeb(musb
->mregs
, MUSB_TESTMODE
, temp
);
426 DBG(5, "set feature %d\n", wValue
);
427 musb
->port1_status
|= 1 << wValue
;
432 /* "protocol stall" on error */
435 spin_unlock_irqrestore(&musb
->lock
, flags
);