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usb/xhci: hide MSI code behind PCI bars

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The MSI related fuctionality requires a few structs which are not
available if CONFIG_PCI is not enabled. This is a prepartion to allow
xhci be built without CONFIG_PCI set.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sebastian Andrzej Siewior 2011-09-23 14:19:58 -07:00 committed by Greg Kroah-Hartman
parent 3fd1ec5873
commit 421aa841a1
1 changed files with 98 additions and 62 deletions
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160
drivers/usb/host/xhci.c
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@ -175,28 +175,19 @@ int xhci_reset(struct xhci_hcd *xhci)
return handshake(xhci, &xhci->op_regs->status, STS_CNR, 0, 250 * 1000);
}
/*
* Free IRQs
* free all IRQs request
*/
static void xhci_free_irq(struct xhci_hcd *xhci)
#ifdef CONFIG_PCI
static int xhci_free_msi(struct xhci_hcd *xhci)
{
int i;
struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
/* return if using legacy interrupt */
if (xhci_to_hcd(xhci)->irq >= 0)
return;
if (!xhci->msix_entries)
return -EINVAL;
if (xhci->msix_entries) {
for (i = 0; i < xhci->msix_count; i++)
if (xhci->msix_entries[i].vector)
free_irq(xhci->msix_entries[i].vector,
xhci_to_hcd(xhci));
} else if (pdev->irq >= 0)
free_irq(pdev->irq, xhci_to_hcd(xhci));
return;
for (i = 0; i < xhci->msix_count; i++)
if (xhci->msix_entries[i].vector)
free_irq(xhci->msix_entries[i].vector,
xhci_to_hcd(xhci));
return 0;
}
/*
@ -223,6 +214,28 @@ static int xhci_setup_msi(struct xhci_hcd *xhci)
return ret;
}
/*
* Free IRQs
* free all IRQs request
*/
static void xhci_free_irq(struct xhci_hcd *xhci)
{
struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
int ret;
/* return if using legacy interrupt */
if (xhci_to_hcd(xhci)->irq >= 0)
return;
ret = xhci_free_msi(xhci);
if (!ret)
return;
if (pdev->irq >= 0)
free_irq(pdev->irq, xhci_to_hcd(xhci));
return;
}
/*
* Set up MSI-X
*/
@ -302,6 +315,72 @@ static void xhci_cleanup_msix(struct xhci_hcd *xhci)
return;
}
static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
{
int i;
if (xhci->msix_entries) {
for (i = 0; i < xhci->msix_count; i++)
synchronize_irq(xhci->msix_entries[i].vector);
}
}
static int xhci_try_enable_msi(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
int ret;
/*
* Some Fresco Logic host controllers advertise MSI, but fail to
* generate interrupts. Don't even try to enable MSI.
*/
if (xhci->quirks & XHCI_BROKEN_MSI)
return 0;
/* unregister the legacy interrupt */
if (hcd->irq)
free_irq(hcd->irq, hcd);
hcd->irq = -1;
ret = xhci_setup_msix(xhci);
if (ret)
/* fall back to msi*/
ret = xhci_setup_msi(xhci);
if (!ret)
/* hcd->irq is -1, we have MSI */
return 0;
/* fall back to legacy interrupt*/
ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
hcd->irq_descr, hcd);
if (ret) {
xhci_err(xhci, "request interrupt %d failed\n",
pdev->irq);
return ret;
}
hcd->irq = pdev->irq;
return 0;
}
#else
static int xhci_try_enable_msi(struct usb_hcd *hcd)
{
return 0;
}
static void xhci_cleanup_msix(struct xhci_hcd *xhci)
{
}
static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
{
}
#endif
/*
* Initialize memory for HCD and xHC (one-time init).
*
@ -397,45 +476,6 @@ static int xhci_run_finished(struct xhci_hcd *xhci)
return 0;
}
static int xhci_try_enable_msi(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
int ret;
/*
* Some Fresco Logic host controllers advertise MSI, but fail to
* generate interrupts. Don't even try to enable MSI.
*/
if (xhci->quirks & XHCI_BROKEN_MSI)
return 0;
/* unregister the legacy interrupt */
if (hcd->irq)
free_irq(hcd->irq, hcd);
hcd->irq = -1;
ret = xhci_setup_msix(xhci);
if (ret)
/* fall back to msi*/
ret = xhci_setup_msi(xhci);
if (!ret)
/* hcd->irq is -1, we have MSI */
return 0;
/* fall back to legacy interrupt*/
ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED,
hcd->irq_descr, hcd);
if (ret) {
xhci_err(xhci, "request interrupt %d failed\n",
pdev->irq);
return ret;
}
hcd->irq = pdev->irq;
return 0;
}
/*
* Start the HC after it was halted.
*
@ -708,7 +748,6 @@ int xhci_suspend(struct xhci_hcd *xhci)
int rc = 0;
struct usb_hcd *hcd = xhci_to_hcd(xhci);
u32 command;
int i;
spin_lock_irq(&xhci->lock);
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
@ -744,10 +783,7 @@ int xhci_suspend(struct xhci_hcd *xhci)
/* step 5: remove core well power */
/* synchronize irq when using MSI-X */
if (xhci->msix_entries) {
for (i = 0; i < xhci->msix_count; i++)
synchronize_irq(xhci->msix_entries[i].vector);
}
xhci_msix_sync_irqs(xhci);
return rc;
}