OpenWrt – Rev 1
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/*
* ADM5120 HCD (Host Controller Driver) for USB
*
* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
*
* This file was derived from fragments of the OHCI driver.
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
*
* 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.
*
*/
#define OHCI_SCHED_ENABLES \
(OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
#ifdef CONFIG_PM
static int admhc_restart(struct admhcd *ahcd);
static int admhc_rh_suspend(struct admhcd *ahcd, int autostop)
__releases(ahcd->lock)
__acquires(ahcd->lock)
{
int status = 0;
ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_RESUME:
admhc_dbg(ahcd, "resume/suspend?\n");
ahcd->hc_control &= ~OHCI_CTRL_HCFS;
ahcd->hc_control |= OHCI_USB_RESET;
admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
(void) admhc_readl(ahcd, &ahcd->regs->control);
/* FALL THROUGH */
case OHCI_USB_RESET:
status = -EBUSY;
admhc_dbg(ahcd, "needs reinit!\n");
goto done;
case OHCI_USB_SUSPEND:
if (!ahcd->autostop) {
admhc_dbg(ahcd, "already suspended\n");
goto done;
}
}
admhc_dbg(ahcd, "%s root hub\n",
autostop ? "auto-stop" : "suspend");
/* First stop any processing */
if (!autostop && (ahcd->hc_control & OHCI_SCHED_ENABLES)) {
ahcd->hc_control &= ~OHCI_SCHED_ENABLES;
admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
admhc_writel(ahcd, OHCI_INTR_SF, &ahcd->regs->intrstatus);
/* sched disables take effect on the next frame,
* then the last WDH could take 6+ msec
*/
admhc_dbg(ahcd, "stopping schedules ...\n");
ahcd->autostop = 0;
spin_unlock_irq (&ahcd->lock);
msleep (8);
spin_lock_irq(&ahcd->lock);
}
dl_done_list (ahcd);
finish_unlinks (ahcd, admhc_frame_no(ahcd));
/* maybe resume can wake root hub */
if (device_may_wakeup(&admhcd_to_hcd(ahcd)->self.root_hub->dev) ||
autostop)
ahcd->hc_control |= OHCI_CTRL_RWE;
else {
admhc_writel(ahcd, OHCI_INTR_RHSC, &ahcd->regs->intrdisable);
ahcd->hc_control &= ~OHCI_CTRL_RWE;
}
/* Suspend hub ... this is the "global (to this bus) suspend" mode,
* which doesn't imply ports will first be individually suspended.
*/
ahcd->hc_control &= ~OHCI_CTRL_HCFS;
ahcd->hc_control |= OHCI_USB_SUSPEND;
admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
(void) admhc_readl(ahcd, &ahcd->regs->control);
/* no resumes until devices finish suspending */
if (!autostop) {
ahcd->next_statechange = jiffies + msecs_to_jiffies (5);
ahcd->autostop = 0;
}
done:
return status;
}
static inline struct ed *find_head(struct ed *ed)
{
/* for bulk and control lists */
while (ed->ed_prev)
ed = ed->ed_prev;
return ed;
}
/* caller has locked the root hub */
static int admhc_rh_resume(struct admhcd *ahcd)
__releases(ahcd->lock)
__acquires(ahcd->lock)
{
struct usb_hcd *hcd = admhcd_to_hcd (ahcd);
u32 temp, enables;
int status = -EINPROGRESS;
int autostopped = ahcd->autostop;
ahcd->autostop = 0;
ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control);
if (ahcd->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
/* this can happen after resuming a swsusp snapshot */
if (hcd->state == HC_STATE_RESUMING) {
admhc_dbg(ahcd, "BIOS/SMM active, control %03x\n",
ahcd->hc_control);
status = -EBUSY;
/* this happens when pmcore resumes HC then root */
} else {
admhc_dbg(ahcd, "duplicate resume\n");
status = 0;
}
} else switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_SUSPEND:
ahcd->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
ahcd->hc_control |= OHCI_USB_RESUME;
admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
(void) admhc_readl(ahcd, &ahcd->regs->control);
admhc_dbg(ahcd, "%s root hub\n",
autostopped ? "auto-start" : "resume");
break;
case OHCI_USB_RESUME:
/* HCFS changes sometime after INTR_RD */
admhc_dbg(ahcd, "%swakeup root hub\n",
autostopped ? "auto-" : "");
break;
case OHCI_USB_OPER:
/* this can happen after resuming a swsusp snapshot */
admhc_dbg(ahcd, "snapshot resume? reinit\n");
status = -EBUSY;
break;
default: /* RESET, we lost power */
admhc_dbg(ahcd, "lost power\n");
status = -EBUSY;
}
if (status == -EBUSY) {
if (!autostopped) {
spin_unlock_irq (&ahcd->lock);
(void) ahcd_init (ahcd);
status = admhc_restart (ahcd);
spin_lock_irq(&ahcd->lock);
}
return status;
}
if (status != -EINPROGRESS)
return status;
if (autostopped)
goto skip_resume;
spin_unlock_irq (&ahcd->lock);
/* Some controllers (lucent erratum) need extra-long delays */
msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
temp = admhc_readl(ahcd, &ahcd->regs->control);
temp &= OHCI_CTRL_HCFS;
if (temp != OHCI_USB_RESUME) {
admhc_err (ahcd, "controller won't resume\n");
spin_lock_irq(&ahcd->lock);
return -EBUSY;
}
/* disable old schedule state, reinit from scratch */
admhc_writel(ahcd, 0, &ahcd->regs->ed_controlhead);
admhc_writel(ahcd, 0, &ahcd->regs->ed_controlcurrent);
admhc_writel(ahcd, 0, &ahcd->regs->ed_bulkhead);
admhc_writel(ahcd, 0, &ahcd->regs->ed_bulkcurrent);
admhc_writel(ahcd, 0, &ahcd->regs->ed_periodcurrent);
admhc_writel(ahcd, (u32) ahcd->hcca_dma, &ahcd->ahcd->regs->hcca);
/* Sometimes PCI D3 suspend trashes frame timings ... */
periodic_reinit(ahcd);
/* the following code is executed with ahcd->lock held and
* irqs disabled if and only if autostopped is true
*/
skip_resume:
/* interrupts might have been disabled */
admhc_writel(ahcd, OHCI_INTR_INIT, &ahcd->regs->int_enable);
if (ahcd->ed_rm_list)
admhc_writel(ahcd, OHCI_INTR_SF, &ahcd->regs->int_enable);
/* Then re-enable operations */
admhc_writel(ahcd, OHCI_USB_OPER, &ahcd->regs->control);
(void) admhc_readl(ahcd, &ahcd->regs->control);
if (!autostopped)
msleep (3);
temp = ahcd->hc_control;
temp &= OHCI_CTRL_RWC;
temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
ahcd->hc_control = temp;
admhc_writel(ahcd, temp, &ahcd->regs->control);
(void) admhc_readl(ahcd, &ahcd->regs->control);
/* TRSMRCY */
if (!autostopped) {
msleep (10);
spin_lock_irq(&ahcd->lock);
}
/* now ahcd->lock is always held and irqs are always disabled */
/* keep it alive for more than ~5x suspend + resume costs */
ahcd->next_statechange = jiffies + STATECHANGE_DELAY;
/* maybe turn schedules back on */
enables = 0;
temp = 0;
if (!ahcd->ed_rm_list) {
if (ahcd->ed_controltail) {
admhc_writel(ahcd,
find_head (ahcd->ed_controltail)->dma,
&ahcd->regs->ed_controlhead);
enables |= OHCI_CTRL_CLE;
temp |= OHCI_CLF;
}
if (ahcd->ed_bulktail) {
admhc_writel(ahcd, find_head (ahcd->ed_bulktail)->dma,
&ahcd->regs->ed_bulkhead);
enables |= OHCI_CTRL_BLE;
temp |= OHCI_BLF;
}
}
if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
if (enables) {
admhc_dbg(ahcd, "restarting schedules ... %08x\n", enables);
ahcd->hc_control |= enables;
admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control);
if (temp)
admhc_writel(ahcd, temp, &ahcd->regs->cmdstatus);
(void) admhc_readl(ahcd, &ahcd->regs->control);
}
return 0;
}
static int admhc_bus_suspend(struct usb_hcd *hcd)
{
struct admhcd *ahcd = hcd_to_admhcd(hcd);
int rc;
spin_lock_irq(&ahcd->lock);
if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
rc = -ESHUTDOWN;
else
rc = admhc_rh_suspend(ahcd, 0);
spin_unlock_irq(&ahcd->lock);
return rc;
}
static int admhc_bus_resume(struct usb_hcd *hcd)
{
struct admhcd *ahcd = hcd_to_admhcd(hcd);
int rc;
if (time_before(jiffies, ahcd->next_statechange))
msleep(5);
spin_lock_irq(&ahcd->lock);
if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
rc = -ESHUTDOWN;
else
rc = admhc_rh_resume(ahcd);
spin_unlock_irq(&ahcd->lock);
/* poll until we know a device is connected or we autostop */
if (rc == 0)
usb_hcd_poll_rh_status(hcd);
return rc;
}
/* Carry out polling-, autostop-, and autoresume-related state changes */
static int admhc_root_hub_state_changes(struct admhcd *ahcd, int changed,
int any_connected)
{
int poll_rh = 1;
switch (ahcd->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_OPER:
/* keep on polling until we know a device is connected
* and RHSC is enabled */
if (!ahcd->autostop) {
if (any_connected ||
!device_may_wakeup(&admhcd_to_hcd(ahcd)
->self.root_hub->dev)) {
if (admhc_readl(ahcd, &ahcd->regs->int_enable) &
OHCI_INTR_RHSC)
poll_rh = 0;
} else {
ahcd->autostop = 1;
ahcd->next_statechange = jiffies + HZ;
}
/* if no devices have been attached for one second, autostop */
} else {
if (changed || any_connected) {
ahcd->autostop = 0;
ahcd->next_statechange = jiffies +
STATECHANGE_DELAY;
} else if (time_after_eq(jiffies,
ahcd->next_statechange)
&& !ahcd->ed_rm_list
&& !(ahcd->hc_control &
OHCI_SCHED_ENABLES)) {
ahcd_rh_suspend(ahcd, 1);
}
}
break;
/* if there is a port change, autostart or ask to be resumed */
case OHCI_USB_SUSPEND:
case OHCI_USB_RESUME:
if (changed) {
if (ahcd->autostop)
admhc_rh_resume(ahcd);
else
usb_hcd_resume_root_hub(admhcd_to_hcd(ahcd));
} else {
/* everything is idle, no need for polling */
poll_rh = 0;
}
break;
}
return poll_rh;
}
/*-------------------------------------------------------------------------*/
/* must not be called from interrupt context */
static int admhc_restart(struct admhcd *ahcd)
{
int temp;
int i;
struct urb_priv *priv;
/* mark any devices gone, so they do nothing till khubd disconnects.
* recycle any "live" eds/tds (and urbs) right away.
* later, khubd disconnect processing will recycle the other state,
* (either as disconnect/reconnect, or maybe someday as a reset).
*/
spin_lock_irq(&ahcd->lock);
admhc_disable(ahcd);
usb_root_hub_lost_power(admhcd_to_hcd(ahcd)->self.root_hub);
if (!list_empty(&ahcd->pending))
admhc_dbg(ahcd, "abort schedule...\n");
list_for_each_entry(priv, &ahcd->pending, pending) {
struct urb *urb = priv->td[0]->urb;
struct ed *ed = priv->ed;
switch (ed->state) {
case ED_OPER:
ed->state = ED_UNLINK;
ed->hwINFO |= cpu_to_hc32(ahcd, ED_DEQUEUE);
ed_deschedule (ahcd, ed);
ed->ed_next = ahcd->ed_rm_list;
ed->ed_prev = NULL;
ahcd->ed_rm_list = ed;
/* FALLTHROUGH */
case ED_UNLINK:
break;
default:
admhc_dbg(ahcd, "bogus ed %p state %d\n",
ed, ed->state);
}
if (!urb->unlinked)
urb->unlinked = -ESHUTDOWN;
}
finish_unlinks(ahcd, 0);
spin_unlock_irq(&ahcd->lock);
/* paranoia, in case that didn't work: */
/* empty the interrupt branches */
for (i = 0; i < NUM_INTS; i++) ahcd->load[i] = 0;
for (i = 0; i < NUM_INTS; i++) ahcd->hcca->int_table[i] = 0;
/* no EDs to remove */
ahcd->ed_rm_list = NULL;
/* empty control and bulk lists */
ahcd->ed_controltail = NULL;
ahcd->ed_bulktail = NULL;
if ((temp = admhc_run(ahcd)) < 0) {
admhc_err(ahcd, "can't restart, %d\n", temp);
return temp;
} else {
/* here we "know" root ports should always stay powered,
* and that if we try to turn them back on the root hub
* will respond to CSC processing.
*/
i = ahcd->num_ports;
while (i--)
admhc_writel(ahcd, RH_PS_PSS,
&ahcd->regs->portstatus[i]);
admhc_dbg(ahcd, "restart complete\n");
}
return 0;
}
#else /* CONFIG_PM */
static inline int admhc_rh_resume(struct admhcd *ahcd)
{
return 0;
}
/* Carry out polling-related state changes.
* autostop isn't used when CONFIG_PM is turned off.
*/
static int admhc_root_hub_state_changes(struct admhcd *ahcd, int changed,
int any_connected)
{
/* If INSM is enabled, don't poll */
if (admhc_readl(ahcd, &ahcd->regs->int_enable) & ADMHC_INTR_INSM)
return 0;
/* If no status changes are pending, enable status-change interrupts */
if (!changed) {
admhc_intr_enable(ahcd, ADMHC_INTR_INSM);
return 0;
}
return 1;
}
#endif /* CONFIG_PM */