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/time.h>
40 #include <linux/timer.h>
42 #include <asm/unaligned.h>
44 #include "musb_core.h"
46 void musb_host_finish_resume(struct work_struct *work)
52 musb = container_of(work, struct musb, finish_resume_work.work);
54 spin_lock_irqsave(&musb->lock, flags);
56 power = musb_readb(musb->mregs, MUSB_POWER);
57 power &= ~MUSB_POWER_RESUME;
58 musb_dbg(musb, "root port resume stopped, power %02x", power);
59 musb_writeb(musb->mregs, MUSB_POWER, power);
62 * ISSUE: DaVinci (RTL 1.300) disconnects after
63 * resume of high speed peripherals (but not full
67 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
68 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
69 usb_hcd_poll_rh_status(musb->hcd);
70 /* NOTE: it might really be A_WAIT_BCON ... */
71 musb->xceiv->otg->state = OTG_STATE_A_HOST;
73 spin_unlock_irqrestore(&musb->lock, flags);
76 int musb_port_suspend(struct musb *musb, bool do_suspend)
78 struct usb_otg *otg = musb->xceiv->otg;
80 void __iomem *mbase = musb->mregs;
82 if (!is_host_active(musb))
85 /* NOTE: this doesn't necessarily put PHY into low power mode,
86 * turning off its clock; that's a function of PHY integration and
87 * MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
88 * SE0 changing to connect (J) or wakeup (K) states.
90 power = musb_readb(mbase, MUSB_POWER);
94 if (power & MUSB_POWER_RESUME)
97 if (!(power & MUSB_POWER_SUSPENDM)) {
98 power |= MUSB_POWER_SUSPENDM;
99 musb_writeb(mbase, MUSB_POWER, power);
101 /* Needed for OPT A tests */
102 power = musb_readb(mbase, MUSB_POWER);
103 while (power & MUSB_POWER_SUSPENDM) {
104 power = musb_readb(mbase, MUSB_POWER);
110 musb_dbg(musb, "Root port suspended, power %02x", power);
112 musb->port1_status |= USB_PORT_STAT_SUSPEND;
113 switch (musb->xceiv->otg->state) {
114 case OTG_STATE_A_HOST:
115 musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
116 musb->is_active = otg->host->b_hnp_enable;
118 mod_timer(&musb->otg_timer, jiffies
120 OTG_TIME_A_AIDL_BDIS));
121 musb_platform_try_idle(musb, 0);
123 case OTG_STATE_B_HOST:
124 musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
125 musb->is_active = otg->host->b_hnp_enable;
126 musb_platform_try_idle(musb, 0);
129 musb_dbg(musb, "bogus rh suspend? %s",
130 usb_otg_state_string(musb->xceiv->otg->state));
132 } else if (power & MUSB_POWER_SUSPENDM) {
133 power &= ~MUSB_POWER_SUSPENDM;
134 power |= MUSB_POWER_RESUME;
135 musb_writeb(mbase, MUSB_POWER, power);
137 musb_dbg(musb, "Root port resuming, power %02x", power);
139 /* later, GetPortStatus will stop RESUME signaling */
140 musb->port1_status |= MUSB_PORT_STAT_RESUME;
141 schedule_delayed_work(&musb->finish_resume_work,
142 msecs_to_jiffies(USB_RESUME_TIMEOUT));
147 void musb_port_reset(struct musb *musb, bool do_reset)
150 void __iomem *mbase = musb->mregs;
152 if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
153 musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle");
154 musb->port1_status &= ~USB_PORT_STAT_RESET;
158 if (!is_host_active(musb))
161 /* NOTE: caller guarantees it will turn off the reset when
162 * the appropriate amount of time has passed
164 power = musb_readb(mbase, MUSB_POWER);
167 * If RESUME is set, we must make sure it stays minimum 20 ms.
168 * Then we must clear RESUME and wait a bit to let musb start
169 * generating SOFs. If we don't do this, OPT HS A 6.8 tests
170 * fail with "Error! Did not receive an SOF before suspend
173 if (power & MUSB_POWER_RESUME) {
174 long remain = (unsigned long) musb->rh_timer - jiffies;
176 if (musb->rh_timer > 0 && remain > 0) {
177 /* take into account the minimum delay after resume */
178 schedule_delayed_work(
179 &musb->deassert_reset_work, remain);
183 musb_writeb(mbase, MUSB_POWER,
184 power & ~MUSB_POWER_RESUME);
186 /* Give the core 1 ms to clear MUSB_POWER_RESUME */
187 schedule_delayed_work(&musb->deassert_reset_work,
188 msecs_to_jiffies(1));
193 musb_writeb(mbase, MUSB_POWER,
194 power | MUSB_POWER_RESET);
196 musb->port1_status |= USB_PORT_STAT_RESET;
197 musb->port1_status &= ~USB_PORT_STAT_ENABLE;
198 schedule_delayed_work(&musb->deassert_reset_work,
199 msecs_to_jiffies(50));
201 musb_dbg(musb, "root port reset stopped");
202 musb_platform_pre_root_reset_end(musb);
203 musb_writeb(mbase, MUSB_POWER,
204 power & ~MUSB_POWER_RESET);
205 musb_platform_post_root_reset_end(musb);
207 power = musb_readb(mbase, MUSB_POWER);
208 if (power & MUSB_POWER_HSMODE) {
209 musb_dbg(musb, "high-speed device connected");
210 musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
213 musb->port1_status &= ~USB_PORT_STAT_RESET;
214 musb->port1_status |= USB_PORT_STAT_ENABLE
215 | (USB_PORT_STAT_C_RESET << 16)
216 | (USB_PORT_STAT_C_ENABLE << 16);
217 usb_hcd_poll_rh_status(musb->hcd);
219 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
223 void musb_root_disconnect(struct musb *musb)
225 struct usb_otg *otg = musb->xceiv->otg;
227 musb->port1_status = USB_PORT_STAT_POWER
228 | (USB_PORT_STAT_C_CONNECTION << 16);
230 usb_hcd_poll_rh_status(musb->hcd);
233 switch (musb->xceiv->otg->state) {
234 case OTG_STATE_A_SUSPEND:
235 if (otg->host->b_hnp_enable) {
236 musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
237 musb->g.is_a_peripheral = 1;
241 case OTG_STATE_A_HOST:
242 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
245 case OTG_STATE_A_WAIT_VFALL:
246 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
249 musb_dbg(musb, "host disconnect (%s)",
250 usb_otg_state_string(musb->xceiv->otg->state));
253 EXPORT_SYMBOL_GPL(musb_root_disconnect);
256 /*---------------------------------------------------------------------*/
258 /* Caller may or may not hold musb->lock */
259 int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
261 struct musb *musb = hcd_to_musb(hcd);
264 /* called in_irq() via usb_hcd_poll_rh_status() */
265 if (musb->port1_status & 0xffff0000) {
272 static int musb_has_gadget(struct musb *musb)
275 * In host-only mode we start a connection right away. In OTG mode
276 * we have to wait until we loaded a gadget. We don't really need a
277 * gadget if we operate as a host but we should not start a session
278 * as a device without a gadget or else we explode.
280 #ifdef CONFIG_USB_MUSB_HOST
283 return musb->port_mode == MUSB_PORT_MODE_HOST;
287 int musb_hub_control(
295 struct musb *musb = hcd_to_musb(hcd);
299 bool start_musb = false;
301 spin_lock_irqsave(&musb->lock, flags);
303 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
304 spin_unlock_irqrestore(&musb->lock, flags);
308 /* hub features: always zero, setting is a NOP
309 * port features: reported, sometimes updated when host is active
313 case ClearHubFeature:
316 case C_HUB_OVER_CURRENT:
317 case C_HUB_LOCAL_POWER:
323 case ClearPortFeature:
324 if ((wIndex & 0xff) != 1)
328 case USB_PORT_FEAT_ENABLE:
330 case USB_PORT_FEAT_SUSPEND:
331 musb_port_suspend(musb, false);
333 case USB_PORT_FEAT_POWER:
334 if (!hcd->self.is_b_host)
335 musb_platform_set_vbus(musb, 0);
337 case USB_PORT_FEAT_C_CONNECTION:
338 case USB_PORT_FEAT_C_ENABLE:
339 case USB_PORT_FEAT_C_OVER_CURRENT:
340 case USB_PORT_FEAT_C_RESET:
341 case USB_PORT_FEAT_C_SUSPEND:
346 musb_dbg(musb, "clear feature %d", wValue);
347 musb->port1_status &= ~(1 << wValue);
349 case GetHubDescriptor:
351 struct usb_hub_descriptor *desc = (void *)buf;
353 desc->bDescLength = 9;
354 desc->bDescriptorType = USB_DT_HUB;
356 desc->wHubCharacteristics = cpu_to_le16(
357 HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
358 | HUB_CHAR_NO_OCPM /* no overcurrent reporting */
360 desc->bPwrOn2PwrGood = 5; /* msec/2 */
361 desc->bHubContrCurrent = 0;
363 /* workaround bogus struct definition */
364 desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */
365 desc->u.hs.DeviceRemovable[1] = 0xff;
370 *(__le32 *) buf = cpu_to_le32(temp);
376 put_unaligned(cpu_to_le32(musb->port1_status
377 & ~MUSB_PORT_STAT_RESUME),
380 /* port change status is more interesting */
381 musb_dbg(musb, "port status %08x", musb->port1_status);
384 if ((wIndex & 0xff) != 1)
388 case USB_PORT_FEAT_POWER:
389 /* NOTE: this controller has a strange state machine
390 * that involves "requesting sessions" according to
391 * magic side effects from incompletely-described
392 * rules about startup...
394 * This call is what really starts the host mode; be
395 * very careful about side effects if you reorder any
396 * initialization logic, e.g. for OTG, or change any
397 * logic relating to VBUS power-up.
399 if (!hcd->self.is_b_host && musb_has_gadget(musb))
402 case USB_PORT_FEAT_RESET:
403 musb_port_reset(musb, true);
405 case USB_PORT_FEAT_SUSPEND:
406 musb_port_suspend(musb, true);
408 case USB_PORT_FEAT_TEST:
409 if (unlikely(is_host_active(musb)))
415 pr_debug("TEST_J\n");
419 pr_debug("TEST_K\n");
423 pr_debug("TEST_SE0_NAK\n");
424 temp = MUSB_TEST_SE0_NAK;
427 pr_debug("TEST_PACKET\n");
428 temp = MUSB_TEST_PACKET;
429 musb_load_testpacket(musb);
432 pr_debug("TEST_FORCE_ENABLE\n");
433 temp = MUSB_TEST_FORCE_HOST
434 | MUSB_TEST_FORCE_HS;
436 musb_writeb(musb->mregs, MUSB_DEVCTL,
437 MUSB_DEVCTL_SESSION);
440 pr_debug("TEST_FIFO_ACCESS\n");
441 temp = MUSB_TEST_FIFO_ACCESS;
446 musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
451 musb_dbg(musb, "set feature %d", wValue);
452 musb->port1_status |= 1 << wValue;
457 /* "protocol stall" on error */
460 spin_unlock_irqrestore(&musb->lock, flags);