ohci-hcd.c

linux-2.6.15.6

		 * depending on usb keyboards may be usable even if the
		 * BIOS/SMM code seems pretty broken.
		 */
		temp = 500;	/* arbitrary: five seconds */

		ohci_writel (ohci, OHCI_INTR_OC, &ohci->regs->intrenable);
		ohci_writel (ohci, OHCI_OCR, &ohci->regs->cmdstatus);
		while (ohci_readl (ohci, &ohci->regs->control) & OHCI_CTRL_IR) {
			msleep (10);
			if (--temp == 0) {
				ohci_err (ohci, "USB HC takeover failed!"
					"  (BIOS/SMM bug)\n");
				return -EBUSY;
			}
		}
		ohci_usb_reset (ohci);
	}
#endif

	/* Disable HC interrupts */
	ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
	// flush the writes
	(void) ohci_readl (ohci, &ohci->regs->control);

	/* Read the number of ports unless overridden */
	if (ohci->num_ports == 0)
		ohci->num_ports = roothub_a(ohci) & RH_A_NDP;

	if (ohci->hcca)
		return 0;

	ohci->hcca = dma_alloc_coherent (ohci_to_hcd(ohci)->self.controller,
			sizeof *ohci->hcca, &ohci->hcca_dma, 0);
	if (!ohci->hcca)
		return -ENOMEM;

	if ((ret = ohci_mem_init (ohci)) < 0)
		ohci_stop (ohci_to_hcd(ohci));

	return ret;

}

/*-------------------------------------------------------------------------*/

/* Start an OHCI controller, set the BUS operational
 * resets USB and controller
 * enable interrupts 
 */
static int ohci_run (struct ohci_hcd *ohci)
{
  	u32			mask, temp;
	int			first = ohci->fminterval == 0;

	disable (ohci);

	/* boot firmware should have set this up (5.1.1.3.1) */
	if (first) {

		temp = ohci_readl (ohci, &ohci->regs->fminterval);
		ohci->fminterval = temp & 0x3fff;
		if (ohci->fminterval != FI)
			ohci_dbg (ohci, "fminterval delta %d\n",
				ohci->fminterval - FI);
		ohci->fminterval |= FSMP (ohci->fminterval) << 16;
		/* also: power/overcurrent flags in roothub.a */
	}

  	/* Reset USB nearly "by the book".  RemoteWakeupConnected
	 * saved if boot firmware (BIOS/SMM/...) told us it's connected
	 * (for OHCI integrated on mainboard, it normally is)
	 */
	ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
	ohci_dbg (ohci, "resetting from state '%s', control = 0x%x\n",
			hcfs2string (ohci->hc_control & OHCI_CTRL_HCFS),
			ohci->hc_control);

	if (ohci->hc_control & OHCI_CTRL_RWC
			&& !(ohci->flags & OHCI_QUIRK_AMD756))
		ohci_to_hcd(ohci)->can_wakeup = 1;

	switch (ohci->hc_control & OHCI_CTRL_HCFS) {
	case OHCI_USB_OPER:
		temp = 0;
		break;
	case OHCI_USB_SUSPEND:
	case OHCI_USB_RESUME:
		ohci->hc_control &= OHCI_CTRL_RWC;
		ohci->hc_control |= OHCI_USB_RESUME;
		temp = 10 /* msec wait */;
		break;
	// case OHCI_USB_RESET:
	default:
		ohci->hc_control &= OHCI_CTRL_RWC;
		ohci->hc_control |= OHCI_USB_RESET;
		temp = 50 /* msec wait */;
		break;
	}
	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
	// flush the writes
	(void) ohci_readl (ohci, &ohci->regs->control);
	msleep(temp);
	temp = roothub_a (ohci);
	if (!(temp & RH_A_NPS)) {
		/* power down each port */
		for (temp = 0; temp < ohci->num_ports; temp++)
			ohci_writel (ohci, RH_PS_LSDA,
				&ohci->regs->roothub.portstatus [temp]);
	}
	// flush those writes
	(void) ohci_readl (ohci, &ohci->regs->control);
	memset (ohci->hcca, 0, sizeof (struct ohci_hcca));

	/* 2msec timelimit here means no irqs/preempt */
	spin_lock_irq (&ohci->lock);

retry:
	/* HC Reset requires max 10 us delay */
	ohci_writel (ohci, OHCI_HCR,  &ohci->regs->cmdstatus);
	temp = 30;	/* ... allow extra time */
	while ((ohci_readl (ohci, &ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
		if (--temp == 0) {
			spin_unlock_irq (&ohci->lock);
			ohci_err (ohci, "USB HC reset timed out!\n");
			return -1;
		}
		udelay (1);
	}

	/* now we're in the SUSPEND state ... must go OPERATIONAL
	 * within 2msec else HC enters RESUME
	 *
	 * ... but some hardware won't init fmInterval "by the book"
	 * (SiS, OPTi ...), so reset again instead.  SiS doesn't need
	 * this if we write fmInterval after we're OPERATIONAL.
	 * Unclear about ALi, ServerWorks, and others ... this could
	 * easily be a longstanding bug in chip init on Linux.
	 */
	if (ohci->flags & OHCI_QUIRK_INITRESET) {
		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
		// flush those writes
		(void) ohci_readl (ohci, &ohci->regs->control);
	}

	/* Tell the controller where the control and bulk lists are
	 * The lists are empty now. */
	ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
	ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);

	/* a reset clears this */
	ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);

	periodic_reinit (ohci);

	/* some OHCI implementations are finicky about how they init.
	 * bogus values here mean not even enumeration could work.
	 */
	if ((ohci_readl (ohci, &ohci->regs->fminterval) & 0x3fff0000) == 0
			|| !ohci_readl (ohci, &ohci->regs->periodicstart)) {
		if (!(ohci->flags & OHCI_QUIRK_INITRESET)) {
			ohci->flags |= OHCI_QUIRK_INITRESET;
			ohci_dbg (ohci, "enabling initreset quirk\n");
			goto retry;
		}
		spin_unlock_irq (&ohci->lock);
		ohci_err (ohci, "init err (%08x %04x)\n",
			ohci_readl (ohci, &ohci->regs->fminterval),
			ohci_readl (ohci, &ohci->regs->periodicstart));
		return -EOVERFLOW;
	}

 	/* start controller operations */
	ohci->hc_control &= OHCI_CTRL_RWC;
 	ohci->hc_control |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
 	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
	ohci_to_hcd(ohci)->state = HC_STATE_RUNNING;

	/* wake on ConnectStatusChange, matching external hubs */
	ohci_writel (ohci, RH_HS_DRWE, &ohci->regs->roothub.status);

	/* Choose the interrupts we care about now, others later on demand */
	mask = OHCI_INTR_INIT;
	ohci_writel (ohci, mask, &ohci->regs->intrstatus);
	ohci_writel (ohci, mask, &ohci->regs->intrenable);

	/* handle root hub init quirks ... */
	temp = roothub_a (ohci);
	temp &= ~(RH_A_PSM | RH_A_OCPM);
	if (ohci->flags & OHCI_QUIRK_SUPERIO) {
		/* NSC 87560 and maybe others */
		temp |= RH_A_NOCP;
		temp &= ~(RH_A_POTPGT | RH_A_NPS);
		ohci_writel (ohci, temp, &ohci->regs->roothub.a);
	} else if ((ohci->flags & OHCI_QUIRK_AMD756) || distrust_firmware) {
		/* hub power always on; required for AMD-756 and some
		 * Mac platforms.  ganged overcurrent reporting, if any.
		 */
		temp |= RH_A_NPS;
		ohci_writel (ohci, temp, &ohci->regs->roothub.a);
	}
	ohci_writel (ohci, RH_HS_LPSC, &ohci->regs->roothub.status);
	ohci_writel (ohci, (temp & RH_A_NPS) ? 0 : RH_B_PPCM,
						&ohci->regs->roothub.b);
	// flush those writes
	(void) ohci_readl (ohci, &ohci->regs->control);

	spin_unlock_irq (&ohci->lock);

	// POTPGT delay is bits 24-31, in 2 ms units.
	mdelay ((temp >> 23) & 0x1fe);
	ohci_to_hcd(ohci)->state = HC_STATE_RUNNING;

	ohci_dump (ohci, 1);

	if (ohci_to_hcd(ohci)->self.root_hub == NULL) {
		register_reboot_notifier (&ohci->reboot_notifier);
		create_debug_files (ohci);
	}

	return 0;
}

/*-------------------------------------------------------------------------*/

/* an interrupt happens */

static irqreturn_t ohci_irq (struct usb_hcd *hcd, struct pt_regs *ptregs)
{
	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
	struct ohci_regs __iomem *regs = ohci->regs;
 	int			ints; 

	/* we can eliminate a (slow) ohci_readl()
	   if _only_ WDH caused this irq */
	if ((ohci->hcca->done_head != 0)
			&& ! (hc32_to_cpup (ohci, &ohci->hcca->done_head)
				& 0x01)) {
		ints =  OHCI_INTR_WDH;

	/* cardbus/... hardware gone before remove() */
	} else if ((ints = ohci_readl (ohci, &regs->intrstatus)) == ~(u32)0) {
		disable (ohci);
		ohci_dbg (ohci, "device removed!\n");
		return IRQ_HANDLED;

	/* interrupt for some other device? */
	} else if ((ints &= ohci_readl (ohci, &regs->intrenable)) == 0) {
		return IRQ_NOTMINE;
	} 

	if (ints & OHCI_INTR_UE) {
		disable (ohci);
		ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");
		// e.g. due to PCI Master/Target Abort

		ohci_dump (ohci, 1);
		ohci_usb_reset (ohci);
	}

	if (ints & OHCI_INTR_RD) {
		ohci_vdbg (ohci, "resume detect\n");
		ohci_writel (ohci, OHCI_INTR_RD, &regs->intrstatus);
		if (hcd->state != HC_STATE_QUIESCING)
			usb_hcd_resume_root_hub(hcd);
	}

	if (ints & OHCI_INTR_WDH) {
		if (HC_IS_RUNNING(hcd->state))
			ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrdisable);	
		spin_lock (&ohci->lock);
		dl_done_list (ohci, ptregs);
		spin_unlock (&ohci->lock);
		if (HC_IS_RUNNING(hcd->state))
			ohci_writel (ohci, OHCI_INTR_WDH, &regs->intrenable); 
	}
  
	/* could track INTR_SO to reduce available PCI/... bandwidth */

	/* handle any pending URB/ED unlinks, leaving INTR_SF enabled
	 * when there's still unlinking to be done (next frame).
	 */
	spin_lock (&ohci->lock);
	if (ohci->ed_rm_list)
		finish_unlinks (ohci, ohci_frame_no(ohci), ptregs);
	if ((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
			&& HC_IS_RUNNING(hcd->state))
		ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);	
	spin_unlock (&ohci->lock);

	if (HC_IS_RUNNING(hcd->state)) {
		ohci_writel (ohci, ints, &regs->intrstatus);
		ohci_writel (ohci, OHCI_INTR_MIE, &regs->intrenable);	
		// flush those writes
		(void) ohci_readl (ohci, &ohci->regs->control);
	}

	return IRQ_HANDLED;
}

/*-------------------------------------------------------------------------*/

static void ohci_stop (struct usb_hcd *hcd)
{	
	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);

	ohci_dbg (ohci, "stop %s controller (state 0x%02x)\n",
		hcfs2string (ohci->hc_control & OHCI_CTRL_HCFS),
		hcd->state);
	ohci_dump (ohci, 1);

	flush_scheduled_work();

	ohci_usb_reset (ohci);
	ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
	
	remove_debug_files (ohci);
	unregister_reboot_notifier (&ohci->reboot_notifier);
	ohci_mem_cleanup (ohci);
	if (ohci->hcca) {
		dma_free_coherent (hcd->self.controller, 
				sizeof *ohci->hcca, 
				ohci->hcca, ohci->hcca_dma);
		ohci->hcca = NULL;
		ohci->hcca_dma = 0;
	}
}

/*-------------------------------------------------------------------------*/

/* must not be called from interrupt context */

#ifdef	CONFIG_PM

static int ohci_restart (struct ohci_hcd *ohci)
{
	int temp;
	int i;
	struct urb_priv *priv;
	struct usb_device *root = ohci_to_hcd(ohci)->self.root_hub;

	/* 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(&ohci->lock);
	disable (ohci);
	for (i = 0; i < root->maxchild; i++) {
		if (root->children [i])
			usb_set_device_state (root->children[i],
				USB_STATE_NOTATTACHED);
	}
	if (!list_empty (&ohci->pending))
		ohci_dbg(ohci, "abort schedule...\n");
	list_for_each_entry (priv, &ohci->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(ohci, ED_DEQUEUE);
			ed_deschedule (ohci, ed);

			ed->ed_next = ohci->ed_rm_list;
			ed->ed_prev = NULL;
			ohci->ed_rm_list = ed;
			/* FALLTHROUGH */
		case ED_UNLINK:
			break;
		default:
			ohci_dbg(ohci, "bogus ed %p state %d\n",
					ed, ed->state);
		}

		spin_lock (&urb->lock);
		urb->status = -ESHUTDOWN;
		spin_unlock (&urb->lock);
	}
	finish_unlinks (ohci, 0, NULL);
	spin_unlock_irq(&ohci->lock);

	/* paranoia, in case that didn't work: */

	/* empty the interrupt branches */
	for (i = 0; i < NUM_INTS; i++) ohci->load [i] = 0;
	for (i = 0; i < NUM_INTS; i++) ohci->hcca->int_table [i] = 0;
	
	/* no EDs to remove */
	ohci->ed_rm_list = NULL;

	/* empty control and bulk lists */	 
	ohci->ed_controltail = NULL;
	ohci->ed_bulktail    = NULL;

	if ((temp = ohci_run (ohci)) < 0) {
		ohci_err (ohci, "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 = ohci->num_ports;
		while (i--)
			ohci_writel (ohci, RH_PS_PSS,
				&ohci->regs->roothub.portstatus [temp]);
		ohci_dbg (ohci, "restart complete\n");
	}
	return 0;
}
#endif

/*-------------------------------------------------------------------------*/

#define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC

MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_DESCRIPTION (DRIVER_INFO);
MODULE_LICENSE ("GPL");

#ifdef CONFIG_PCI
#include "ohci-pci.c"
#endif

#ifdef CONFIG_SA1111
#include "ohci-sa1111.c"
#endif

#ifdef CONFIG_ARCH_S3C2410
#include "ohci-s3c2410.c"
#endif

#ifdef CONFIG_ARCH_OMAP
#include "ohci-omap.c"
#endif

#ifdef CONFIG_ARCH_LH7A404
#include "ohci-lh7a404.c"
#endif

#ifdef CONFIG_PXA27x
#include "ohci-pxa27x.c"
#endif

#ifdef CONFIG_SOC_AU1X00
#include "ohci-au1xxx.c"
#endif

#ifdef CONFIG_USB_OHCI_HCD_PPC_SOC
#include "ohci-ppc-soc.c"
#endif

#if !(defined(CONFIG_PCI) \
      || defined(CONFIG_SA1111) \
      || defined(CONFIG_ARCH_S3C2410) \
      || defined(CONFIG_ARCH_OMAP) \
      || defined (CONFIG_ARCH_LH7A404) \
      || defined (CONFIG_PXA27x) \
      || defined (CONFIG_SOC_AU1X00) \
      || defined (CONFIG_USB_OHCI_HCD_PPC_SOC) \
	)
#error "missing bus glue for ohci-hcd"
#endif