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|
/*
* MUSB OTG driver virtual root hub support
*
* Copyright 2005 Mentor Graphics Corporation
* Copyright (C) 2005-2006 by Texas Instruments
* Copyright (C) 2006-2007 Nokia Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <asm/unaligned.h>
#include "musb_core.h"
static void musb_port_suspend(struct musb *musb, bool do_suspend)
{
u8 power;
void __iomem *mbase = musb->mregs;
if (!is_host_active(musb))
return;
/* NOTE: this doesn't necessarily put PHY into low power mode,
* turning off its clock; that's a function of PHY integration and
* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
* SE0 changing to connect (J) or wakeup (K) states.
*/
power = musb_readb(mbase, MUSB_POWER);
if (do_suspend) {
int retries = 10000;
power &= ~MUSB_POWER_RESUME;
power |= MUSB_POWER_SUSPENDM;
musb_writeb(mbase, MUSB_POWER, power);
/* Needed for OPT A tests */
power = musb_readb(mbase, MUSB_POWER);
while (power & MUSB_POWER_SUSPENDM) {
power = musb_readb(mbase, MUSB_POWER);
if (retries-- < 1)
break;
}
dev_dbg(musb->controller, "Root port suspended, power %02x\n", power);
musb->port1_status |= USB_PORT_STAT_SUSPEND;
switch (musb->xceiv->state) {
case OTG_STATE_A_HOST:
musb->xceiv->state = OTG_STATE_A_SUSPEND;
musb->is_active = is_otg_enabled(musb)
&& musb->xceiv->host->b_hnp_enable;
if (musb->is_active)
mod_timer(&musb->otg_timer, jiffies
+ msecs_to_jiffies(
OTG_TIME_A_AIDL_BDIS));
musb_platform_try_idle(musb, 0);
break;
#ifdef CONFIG_USB_MUSB_OTG
case OTG_STATE_B_HOST:
musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
musb->is_active = is_otg_enabled(musb)
&& musb->xceiv->host->b_hnp_enable;
musb_platform_try_idle(musb, 0);
break;
#endif
default:
dev_dbg(musb->controller, "bogus rh suspend? %s\n",
otg_state_string(musb->xceiv->state));
}
} else if (power & MUSB_POWER_SUSPENDM) {
power &= ~MUSB_POWER_SUSPENDM;
power |= MUSB_POWER_RESUME;
musb_writeb(mbase, MUSB_POWER, power);
dev_dbg(musb->controller, "Root port resuming, power %02x\n", power);
/* later, GetPortStatus will stop RESUME signaling */
musb->port1_status |= MUSB_PORT_STAT_RESUME;
musb->rh_timer = jiffies + msecs_to_jiffies(20);
}
}
static void musb_port_reset(struct musb *musb, bool do_reset)
{
u8 power;
void __iomem *mbase = musb->mregs;
#ifdef CONFIG_USB_MUSB_OTG
if (musb->xceiv->state == OTG_STATE_B_IDLE) {
dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
musb->port1_status &= ~USB_PORT_STAT_RESET;
return;
}
#endif
if (!is_host_active(musb))
return;
/* NOTE: caller guarantees it will turn off the reset when
* the appropriate amount of time has passed
*/
power = musb_readb(mbase, MUSB_POWER);
if (do_reset) {
/*
* If RESUME is set, we must make sure it stays minimum 20 ms.
* Then we must clear RESUME and wait a bit to let musb start
* generating SOFs. If we don't do this, OPT HS A 6.8 tests
* fail with "Error! Did not receive an SOF before suspend
* detected".
*/
if (power & MUSB_POWER_RESUME) {
while (time_before(jiffies, musb->rh_timer))
msleep(1);
musb_writeb(mbase, MUSB_POWER,
power & ~MUSB_POWER_RESUME);
msleep(1);
}
musb->ignore_disconnect = true;
power &= 0xf0;
musb_writeb(mbase, MUSB_POWER,
power | MUSB_POWER_RESET);
musb->port1_status |= USB_PORT_STAT_RESET;
musb->port1_status &= ~USB_PORT_STAT_ENABLE;
musb->rh_timer = jiffies + msecs_to_jiffies(50);
} else {
dev_dbg(musb->controller, "root port reset stopped\n");
musb_writeb(mbase, MUSB_POWER,
power & ~MUSB_POWER_RESET);
musb->ignore_disconnect = false;
power = musb_readb(mbase, MUSB_POWER);
if (power & MUSB_POWER_HSMODE) {
dev_dbg(musb->controller, "high-speed device connected\n");
musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
}
musb->port1_status &= ~USB_PORT_STAT_RESET;
musb->port1_status |= USB_PORT_STAT_ENABLE
| (USB_PORT_STAT_C_RESET << 16)
| (USB_PORT_STAT_C_ENABLE << 16);
usb_hcd_poll_rh_status(musb_to_hcd(musb));
musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
}
}
void musb_root_disconnect(struct musb *musb)
{
musb->port1_status = USB_PORT_STAT_POWER
| (USB_PORT_STAT_C_CONNECTION << 16);
usb_hcd_poll_rh_status(musb_to_hcd(musb));
musb->is_active = 0;
switch (musb->xceiv->state) {
case OTG_STATE_A_SUSPEND:
#ifdef CONFIG_USB_MUSB_OTG
if (is_otg_enabled(musb)
&& musb->xceiv->host->b_hnp_enable) {
musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
musb->g.is_a_peripheral = 1;
break;
}
#endif
/* FALLTHROUGH */
case OTG_STATE_A_HOST:
musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
musb->is_active = 0;
break;
case OTG_STATE_A_WAIT_VFALL:
musb->xceiv->state = OTG_STATE_B_IDLE;
break;
default:
dev_dbg(musb->controller, "host disconnect (%s)\n",
otg_state_string(musb->xceiv->state));
}
}
/*---------------------------------------------------------------------*/
/* Caller may or may not hold musb->lock */
int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
{
struct musb *musb = hcd_to_musb(hcd);
int retval = 0;
/* called in_irq() via usb_hcd_poll_rh_status() */
if (musb->port1_status & 0xffff0000) {
*buf = 0x02;
retval = 1;
}
return retval;
}
int musb_hub_control(
struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength)
{
struct musb *musb = hcd_to_musb(hcd);
u32 temp;
int retval = 0;
unsigned long flags;
spin_lock_irqsave(&musb->lock, flags);
if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
spin_unlock_irqrestore(&musb->lock, flags);
return -ESHUTDOWN;
}
/* hub features: always zero, setting is a NOP
* port features: reported, sometimes updated when host is active
* no indicators
*/
switch (typeReq) {
case ClearHubFeature:
case SetHubFeature:
switch (wValue) {
case C_HUB_OVER_CURRENT:
case C_HUB_LOCAL_POWER:
break;
default:
goto error;
}
break;
case ClearPortFeature:
if ((wIndex & 0xff) != 1)
goto error;
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
break;
case USB_PORT_FEAT_SUSPEND:
musb_port_suspend(musb, false);
break;
case USB_PORT_FEAT_POWER:
if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
musb_platform_set_vbus(musb, 0);
break;
case USB_PORT_FEAT_C_CONNECTION:
case USB_PORT_FEAT_C_ENABLE:
case USB_PORT_FEAT_C_OVER_CURRENT:
case USB_PORT_FEAT_C_RESET:
case<
|