From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 .../files-3.18/drivers/usb/host/adm5120-pm.c       | 449 +++++++++++++++++++++
 1 file changed, 449 insertions(+)
 create mode 100644 target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-pm.c

(limited to 'target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-pm.c')

diff --git a/target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-pm.c b/target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-pm.c
new file mode 100644
index 0000000..7d7fc24
--- /dev/null
+++ b/target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-pm.c
@@ -0,0 +1,449 @@
+/*
+ * 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 */
+
-- 
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