[PATCH] USB: add reboot notifier to ohci
Adds a reboot notifier to OHCI, mostly to benefit kexec; plus
minor #include tweaks.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 1e27f10..3212004 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -95,12 +95,11 @@
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
-#include <linux/interrupt.h> /* for in_interrupt () */
#include <linux/usb.h>
#include <linux/usb_otg.h>
-#include "../core/hcd.h"
#include <linux/dma-mapping.h>
-#include <linux/dmapool.h> /* needed by ohci-mem.c when no PCI */
+#include <linux/dmapool.h>
+#include <linux/reboot.h>
#include <asm/io.h>
#include <asm/irq.h>
@@ -108,8 +107,9 @@
#include <asm/unaligned.h>
#include <asm/byteorder.h>
+#include "../core/hcd.h"
-#define DRIVER_VERSION "2004 Nov 08"
+#define DRIVER_VERSION "2005 April 22"
#define DRIVER_AUTHOR "Roman Weissgaerber, David Brownell"
#define DRIVER_DESC "USB 1.1 'Open' Host Controller (OHCI) Driver"
@@ -141,6 +141,7 @@
static void ohci_dump (struct ohci_hcd *ohci, int verbose);
static int ohci_init (struct ohci_hcd *ohci);
static void ohci_stop (struct usb_hcd *hcd);
+static int ohci_reboot (struct notifier_block *, unsigned long , void *);
#include "ohci-hub.c"
#include "ohci-dbg.c"
@@ -420,6 +421,23 @@
ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
}
+/* reboot notifier forcibly disables IRQs and DMA, helping kexec and
+ * other cases where the next software may expect clean state from the
+ * "firmware". this is bus-neutral, unlike shutdown() methods.
+ */
+static int
+ohci_reboot (struct notifier_block *block, unsigned long code, void *null)
+{
+ struct ohci_hcd *ohci;
+
+ ohci = container_of (block, struct ohci_hcd, reboot_notifier);
+ ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
+ ohci_usb_reset (ohci);
+ /* flush the writes */
+ (void) ohci_readl (ohci, &ohci->regs->control);
+ return 0;
+}
+
/*-------------------------------------------------------------------------*
* HC functions
*-------------------------------------------------------------------------*/
@@ -684,6 +702,7 @@
if (ohci->power_budget)
hub_set_power_budget(udev, ohci->power_budget);
+ register_reboot_notifier (&ohci->reboot_notifier);
create_debug_files (ohci);
return 0;
}
@@ -781,6 +800,7 @@
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,