[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 <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
commit f4df0e334a9fc731689e8ba4f42a0d72a7491348
tree 7bce31f214c0fe1feb221726f6f19b78cae3aa1c
parent ff7c79e4f37821235b51fb8e19088c08938cc8fc
author David Brownell <[EMAIL PROTECTED]> Sat, 23 Apr 2005 12:49:16 -0700
committer Greg Kroah-Hartman <[EMAIL PROTECTED]> Mon, 27 Jun 2005 14:43:46 -0700
drivers/usb/host/ohci-hcd.c | 28 ++++++++++++++++++++++++----
drivers/usb/host/ohci-mem.c | 1 +
drivers/usb/host/ohci.h | 1 +
3 files changed, 26 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
--- 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 const char hcd_name [] = "ohci_hc
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 @@ static void ohci_usb_reset (struct ohci_
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 @@ retry:
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 @@ static void ohci_stop (struct usb_hcd *h
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,
diff --git a/drivers/usb/host/ohci-mem.c b/drivers/usb/host/ohci-mem.c
--- a/drivers/usb/host/ohci-mem.c
+++ b/drivers/usb/host/ohci-mem.c
@@ -29,6 +29,7 @@ static void ohci_hcd_init (struct ohci_h
spin_lock_init (&ohci->lock);
INIT_LIST_HEAD (&ohci->pending);
INIT_WORK (&ohci->rh_resume, ohci_rh_resume, ohci_to_hcd(ohci));
+ ohci->reboot_notifier.notifier_call = ohci_reboot;
}
/*-------------------------------------------------------------------------*/
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -390,6 +390,7 @@ struct ohci_hcd {
u32 fminterval; /* saved register */
struct work_struct rh_resume;
+ struct notifier_block reboot_notifier;
unsigned long flags; /* for HC bugs */
#define OHCI_QUIRK_AMD756 0x01 /* erratum #4 */
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