541c7d432f
This patch (as1393) converts several of the single-bit fields in struct usb_hcd to atomic flags. This is for safety's sake; not all CPUs can update bitfield values atomically, and these flags are used in multiple contexts. The flag fields that are set only during registration or removal can remain as they are, since non-atomic accesses at those times will not cause any problems. (Strictly speaking, the authorized_default flag should become atomic as well. I didn't bother with it because it gets changed only via sysfs. It can be done later, if anyone wants.) Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
438 lines
11 KiB
C
438 lines
11 KiB
C
/*
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* MUSB OTG driver virtual root hub support
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*
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* Copyright 2005 Mentor Graphics Corporation
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* Copyright (C) 2005-2006 by Texas Instruments
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* Copyright (C) 2006-2007 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/time.h>
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#include <linux/timer.h>
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#include <asm/unaligned.h>
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#include "musb_core.h"
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static void musb_port_suspend(struct musb *musb, bool do_suspend)
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{
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u8 power;
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void __iomem *mbase = musb->mregs;
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if (!is_host_active(musb))
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return;
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/* NOTE: this doesn't necessarily put PHY into low power mode,
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* turning off its clock; that's a function of PHY integration and
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* MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect
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* SE0 changing to connect (J) or wakeup (K) states.
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*/
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power = musb_readb(mbase, MUSB_POWER);
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if (do_suspend) {
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int retries = 10000;
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power &= ~MUSB_POWER_RESUME;
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power |= MUSB_POWER_SUSPENDM;
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musb_writeb(mbase, MUSB_POWER, power);
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/* Needed for OPT A tests */
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power = musb_readb(mbase, MUSB_POWER);
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while (power & MUSB_POWER_SUSPENDM) {
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power = musb_readb(mbase, MUSB_POWER);
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if (retries-- < 1)
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break;
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}
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DBG(3, "Root port suspended, power %02x\n", power);
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musb->port1_status |= USB_PORT_STAT_SUSPEND;
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switch (musb->xceiv->state) {
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case OTG_STATE_A_HOST:
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musb->xceiv->state = OTG_STATE_A_SUSPEND;
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musb->is_active = is_otg_enabled(musb)
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&& musb->xceiv->host->b_hnp_enable;
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if (musb->is_active)
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mod_timer(&musb->otg_timer, jiffies
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+ msecs_to_jiffies(
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OTG_TIME_A_AIDL_BDIS));
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musb_platform_try_idle(musb, 0);
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break;
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#ifdef CONFIG_USB_MUSB_OTG
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case OTG_STATE_B_HOST:
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musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
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musb->is_active = is_otg_enabled(musb)
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&& musb->xceiv->host->b_hnp_enable;
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musb_platform_try_idle(musb, 0);
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break;
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#endif
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default:
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DBG(1, "bogus rh suspend? %s\n",
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otg_state_string(musb));
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}
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} else if (power & MUSB_POWER_SUSPENDM) {
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power &= ~MUSB_POWER_SUSPENDM;
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power |= MUSB_POWER_RESUME;
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musb_writeb(mbase, MUSB_POWER, power);
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DBG(3, "Root port resuming, power %02x\n", power);
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/* later, GetPortStatus will stop RESUME signaling */
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musb->port1_status |= MUSB_PORT_STAT_RESUME;
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musb->rh_timer = jiffies + msecs_to_jiffies(20);
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}
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}
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static void musb_port_reset(struct musb *musb, bool do_reset)
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{
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u8 power;
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void __iomem *mbase = musb->mregs;
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#ifdef CONFIG_USB_MUSB_OTG
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if (musb->xceiv->state == OTG_STATE_B_IDLE) {
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DBG(2, "HNP: Returning from HNP; no hub reset from b_idle\n");
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musb->port1_status &= ~USB_PORT_STAT_RESET;
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return;
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}
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#endif
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if (!is_host_active(musb))
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return;
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/* NOTE: caller guarantees it will turn off the reset when
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* the appropriate amount of time has passed
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*/
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power = musb_readb(mbase, MUSB_POWER);
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if (do_reset) {
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/*
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* If RESUME is set, we must make sure it stays minimum 20 ms.
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* Then we must clear RESUME and wait a bit to let musb start
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* generating SOFs. If we don't do this, OPT HS A 6.8 tests
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* fail with "Error! Did not receive an SOF before suspend
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* detected".
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*/
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if (power & MUSB_POWER_RESUME) {
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while (time_before(jiffies, musb->rh_timer))
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msleep(1);
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musb_writeb(mbase, MUSB_POWER,
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power & ~MUSB_POWER_RESUME);
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msleep(1);
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}
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musb->ignore_disconnect = true;
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power &= 0xf0;
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musb_writeb(mbase, MUSB_POWER,
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power | MUSB_POWER_RESET);
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musb->port1_status |= USB_PORT_STAT_RESET;
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musb->port1_status &= ~USB_PORT_STAT_ENABLE;
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musb->rh_timer = jiffies + msecs_to_jiffies(50);
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} else {
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DBG(4, "root port reset stopped\n");
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musb_writeb(mbase, MUSB_POWER,
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power & ~MUSB_POWER_RESET);
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musb->ignore_disconnect = false;
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power = musb_readb(mbase, MUSB_POWER);
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if (power & MUSB_POWER_HSMODE) {
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DBG(4, "high-speed device connected\n");
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musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
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}
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musb->port1_status &= ~USB_PORT_STAT_RESET;
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musb->port1_status |= USB_PORT_STAT_ENABLE
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| (USB_PORT_STAT_C_RESET << 16)
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| (USB_PORT_STAT_C_ENABLE << 16);
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usb_hcd_poll_rh_status(musb_to_hcd(musb));
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musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
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}
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}
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void musb_root_disconnect(struct musb *musb)
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{
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musb->port1_status = USB_PORT_STAT_POWER
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| (USB_PORT_STAT_C_CONNECTION << 16);
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usb_hcd_poll_rh_status(musb_to_hcd(musb));
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musb->is_active = 0;
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switch (musb->xceiv->state) {
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case OTG_STATE_A_SUSPEND:
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#ifdef CONFIG_USB_MUSB_OTG
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if (is_otg_enabled(musb)
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&& musb->xceiv->host->b_hnp_enable) {
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musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
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musb->g.is_a_peripheral = 1;
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break;
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}
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#endif
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/* FALLTHROUGH */
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case OTG_STATE_A_HOST:
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musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
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musb->is_active = 0;
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break;
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case OTG_STATE_A_WAIT_VFALL:
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musb->xceiv->state = OTG_STATE_B_IDLE;
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break;
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default:
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DBG(1, "host disconnect (%s)\n", otg_state_string(musb));
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}
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}
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/*---------------------------------------------------------------------*/
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/* Caller may or may not hold musb->lock */
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int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
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{
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struct musb *musb = hcd_to_musb(hcd);
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int retval = 0;
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/* called in_irq() via usb_hcd_poll_rh_status() */
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if (musb->port1_status & 0xffff0000) {
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*buf = 0x02;
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retval = 1;
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}
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return retval;
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}
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int musb_hub_control(
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struct usb_hcd *hcd,
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u16 typeReq,
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u16 wValue,
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u16 wIndex,
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char *buf,
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u16 wLength)
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{
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struct musb *musb = hcd_to_musb(hcd);
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u32 temp;
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int retval = 0;
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unsigned long flags;
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spin_lock_irqsave(&musb->lock, flags);
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if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
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spin_unlock_irqrestore(&musb->lock, flags);
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return -ESHUTDOWN;
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}
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/* hub features: always zero, setting is a NOP
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* port features: reported, sometimes updated when host is active
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* no indicators
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*/
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switch (typeReq) {
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case ClearHubFeature:
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case SetHubFeature:
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switch (wValue) {
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case C_HUB_OVER_CURRENT:
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case C_HUB_LOCAL_POWER:
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break;
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default:
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goto error;
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}
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break;
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case ClearPortFeature:
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if ((wIndex & 0xff) != 1)
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goto error;
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switch (wValue) {
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case USB_PORT_FEAT_ENABLE:
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break;
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case USB_PORT_FEAT_SUSPEND:
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musb_port_suspend(musb, false);
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break;
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case USB_PORT_FEAT_POWER:
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if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
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musb_set_vbus(musb, 0);
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break;
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case USB_PORT_FEAT_C_CONNECTION:
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case USB_PORT_FEAT_C_ENABLE:
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case USB_PORT_FEAT_C_OVER_CURRENT:
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case USB_PORT_FEAT_C_RESET:
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case USB_PORT_FEAT_C_SUSPEND:
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break;
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default:
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goto error;
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}
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DBG(5, "clear feature %d\n", wValue);
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musb->port1_status &= ~(1 << wValue);
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break;
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case GetHubDescriptor:
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{
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struct usb_hub_descriptor *desc = (void *)buf;
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desc->bDescLength = 9;
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desc->bDescriptorType = 0x29;
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desc->bNbrPorts = 1;
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desc->wHubCharacteristics = cpu_to_le16(
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0x0001 /* per-port power switching */
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| 0x0010 /* no overcurrent reporting */
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);
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desc->bPwrOn2PwrGood = 5; /* msec/2 */
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desc->bHubContrCurrent = 0;
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/* workaround bogus struct definition */
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desc->DeviceRemovable[0] = 0x02; /* port 1 */
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desc->DeviceRemovable[1] = 0xff;
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}
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break;
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case GetHubStatus:
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temp = 0;
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*(__le32 *) buf = cpu_to_le32(temp);
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break;
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case GetPortStatus:
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if (wIndex != 1)
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goto error;
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/* finish RESET signaling? */
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if ((musb->port1_status & USB_PORT_STAT_RESET)
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&& time_after_eq(jiffies, musb->rh_timer))
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musb_port_reset(musb, false);
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/* finish RESUME signaling? */
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if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
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&& time_after_eq(jiffies, musb->rh_timer)) {
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u8 power;
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power = musb_readb(musb->mregs, MUSB_POWER);
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power &= ~MUSB_POWER_RESUME;
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DBG(4, "root port resume stopped, power %02x\n",
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power);
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musb_writeb(musb->mregs, MUSB_POWER, power);
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/* ISSUE: DaVinci (RTL 1.300) disconnects after
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* resume of high speed peripherals (but not full
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* speed ones).
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*/
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musb->is_active = 1;
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musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
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| MUSB_PORT_STAT_RESUME);
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musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
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usb_hcd_poll_rh_status(musb_to_hcd(musb));
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/* NOTE: it might really be A_WAIT_BCON ... */
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musb->xceiv->state = OTG_STATE_A_HOST;
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}
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put_unaligned(cpu_to_le32(musb->port1_status
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& ~MUSB_PORT_STAT_RESUME),
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(__le32 *) buf);
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/* port change status is more interesting */
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DBG(get_unaligned((u16 *)(buf+2)) ? 2 : 5, "port status %08x\n",
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musb->port1_status);
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break;
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case SetPortFeature:
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if ((wIndex & 0xff) != 1)
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goto error;
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switch (wValue) {
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case USB_PORT_FEAT_POWER:
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/* NOTE: this controller has a strange state machine
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* that involves "requesting sessions" according to
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* magic side effects from incompletely-described
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* rules about startup...
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*
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* This call is what really starts the host mode; be
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* very careful about side effects if you reorder any
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* initialization logic, e.g. for OTG, or change any
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* logic relating to VBUS power-up.
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*/
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if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
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musb_start(musb);
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break;
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case USB_PORT_FEAT_RESET:
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musb_port_reset(musb, true);
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break;
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case USB_PORT_FEAT_SUSPEND:
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musb_port_suspend(musb, true);
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break;
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case USB_PORT_FEAT_TEST:
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if (unlikely(is_host_active(musb)))
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goto error;
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wIndex >>= 8;
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switch (wIndex) {
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case 1:
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pr_debug("TEST_J\n");
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temp = MUSB_TEST_J;
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break;
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case 2:
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pr_debug("TEST_K\n");
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temp = MUSB_TEST_K;
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break;
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case 3:
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pr_debug("TEST_SE0_NAK\n");
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temp = MUSB_TEST_SE0_NAK;
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break;
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case 4:
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pr_debug("TEST_PACKET\n");
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temp = MUSB_TEST_PACKET;
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musb_load_testpacket(musb);
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break;
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case 5:
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pr_debug("TEST_FORCE_ENABLE\n");
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temp = MUSB_TEST_FORCE_HOST
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| MUSB_TEST_FORCE_HS;
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musb_writeb(musb->mregs, MUSB_DEVCTL,
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MUSB_DEVCTL_SESSION);
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break;
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case 6:
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pr_debug("TEST_FIFO_ACCESS\n");
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temp = MUSB_TEST_FIFO_ACCESS;
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break;
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default:
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goto error;
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}
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musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
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break;
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default:
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goto error;
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}
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DBG(5, "set feature %d\n", wValue);
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musb->port1_status |= 1 << wValue;
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break;
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default:
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error:
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/* "protocol stall" on error */
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retval = -EPIPE;
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}
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spin_unlock_irqrestore(&musb->lock, flags);
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return retval;
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}
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