[PATCH] UHCI: unify BIOS handoff and driver reset code
This patch (as574) updates the PCI BIOS usb-handoff code for UHCI
controllers, making it work like the reset routines in uhci-hcd. This
allows uhci-hcd to drop its own routines in favor of the new ones
(code-sharing).
Once the patch is merged we can turn the usb-handoff option on
permanently, as far as UHCI is concerned. OHCI and EHCI may still have
some issues.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 34c9dbc..6df555e 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -101,37 +101,16 @@
#include "uhci-q.c"
#include "uhci-hub.c"
+extern void uhci_reset_hc(struct pci_dev *pdev, unsigned long base);
+extern int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base);
+
/*
- * Make sure the controller is completely inactive, unable to
- * generate interrupts or do DMA.
+ * Finish up a host controller reset and update the recorded state.
*/
-static void reset_hc(struct uhci_hcd *uhci)
+static void finish_reset(struct uhci_hcd *uhci)
{
int port;
- /* Turn off PIRQ enable and SMI enable. (This also turns off the
- * BIOS's USB Legacy Support.) Turn off all the R/WC bits too.
- */
- pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP,
- USBLEGSUP_RWC);
-
- /* Reset the HC - this will force us to get a
- * new notification of any already connected
- * ports due to the virtual disconnect that it
- * implies.
- */
- outw(USBCMD_HCRESET, uhci->io_addr + USBCMD);
- mb();
- udelay(5);
- if (inw(uhci->io_addr + USBCMD) & USBCMD_HCRESET)
- dev_warn(uhci_dev(uhci), "HCRESET not completed yet!\n");
-
- /* Just to be safe, disable interrupt requests and
- * make sure the controller is stopped.
- */
- outw(0, uhci->io_addr + USBINTR);
- outw(0, uhci->io_addr + USBCMD);
-
/* HCRESET doesn't affect the Suspend, Reset, and Resume Detect
* bits in the port status and control registers.
* We have to clear them by hand.
@@ -153,7 +132,8 @@
*/
static void hc_died(struct uhci_hcd *uhci)
{
- reset_hc(uhci);
+ uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr);
+ finish_reset(uhci);
uhci->hc_inaccessible = 1;
}
@@ -163,44 +143,8 @@
*/
static void check_and_reset_hc(struct uhci_hcd *uhci)
{
- u16 legsup;
- unsigned int cmd, intr;
-
- /*
- * When restarting a suspended controller, we expect all the
- * settings to be the same as we left them:
- *
- * PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
- * Controller is stopped and configured with EGSM set;
- * No interrupts enabled except possibly Resume Detect.
- *
- * If any of these conditions are violated we do a complete reset.
- */
- pci_read_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, &legsup);
- if (legsup & ~(USBLEGSUP_RO | USBLEGSUP_RWC)) {
- dev_dbg(uhci_dev(uhci), "%s: legsup = 0x%04x\n",
- __FUNCTION__, legsup);
- goto reset_needed;
- }
-
- cmd = inw(uhci->io_addr + USBCMD);
- if ((cmd & USBCMD_RS) || !(cmd & USBCMD_CF) || !(cmd & USBCMD_EGSM)) {
- dev_dbg(uhci_dev(uhci), "%s: cmd = 0x%04x\n",
- __FUNCTION__, cmd);
- goto reset_needed;
- }
-
- intr = inw(uhci->io_addr + USBINTR);
- if (intr & (~USBINTR_RESUME)) {
- dev_dbg(uhci_dev(uhci), "%s: intr = 0x%04x\n",
- __FUNCTION__, intr);
- goto reset_needed;
- }
- return;
-
-reset_needed:
- dev_dbg(uhci_dev(uhci), "Performing full reset\n");
- reset_hc(uhci);
+ if (uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr))
+ finish_reset(uhci);
}
/*
@@ -714,7 +658,7 @@
spin_lock_irq(&uhci->lock);
if (!uhci->hc_inaccessible)
- reset_hc(uhci);
+ hc_died(uhci);
uhci_scan_schedule(uhci, NULL);
spin_unlock_irq(&uhci->lock);