From acc08503406f97ce6582c92fd8c8139f1e871a96 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Wed, 10 Oct 2012 15:07:39 -0400 Subject: [PATCH] USB: EHCI: make ehci_read_frame_index platform independent In preparation for splitting the ehci-hcd driver into a core library and separate platform-specific driver modules, this patch (as1617) changes the way ehci_read_frame_index() is handled. Since the same core library will have to work with both PCI and non-PCI platforms, the quirk handler routine will be compiled unconditionally. The decision about whether to call it or simply to read the frame index register is made at run time, based on whether the frame_index_bug quirk flag is set. Signed-off-by: Alan Stern Acked-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-hcd.c | 27 ++++++++++++++++++++++++++- drivers/usb/host/ehci-sched.c | 23 ----------------------- drivers/usb/host/ehci.h | 16 ---------------- 3 files changed, 26 insertions(+), 40 deletions(-) diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 28fb5dd..9c2afb51 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -118,9 +118,34 @@ MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us"); /*-------------------------------------------------------------------------*/ #include "ehci.h" -#include "ehci-dbg.c" #include "pci-quirks.h" +/* + * The MosChip MCS9990 controller updates its microframe counter + * a little before the frame counter, and occasionally we will read + * the invalid intermediate value. Avoid problems by checking the + * microframe number (the low-order 3 bits); if they are 0 then + * re-read the register to get the correct value. + */ +static unsigned ehci_moschip_read_frame_index(struct ehci_hcd *ehci) +{ + unsigned uf; + + uf = ehci_readl(ehci, &ehci->regs->frame_index); + if (unlikely((uf & 7) == 0)) + uf = ehci_readl(ehci, &ehci->regs->frame_index); + return uf; +} + +static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci) +{ + if (ehci->frame_index_bug) + return ehci_moschip_read_frame_index(ehci); + return ehci_readl(ehci, &ehci->regs->frame_index); +} + +#include "ehci-dbg.c" + /*-------------------------------------------------------------------------*/ /* diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index b538a4d..2e14714 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/drivers/usb/host/ehci-sched.c @@ -36,29 +36,6 @@ static int ehci_get_frame (struct usb_hcd *hcd); -#ifdef CONFIG_PCI - -static unsigned ehci_read_frame_index(struct ehci_hcd *ehci) -{ - unsigned uf; - - /* - * The MosChip MCS9990 controller updates its microframe counter - * a little before the frame counter, and occasionally we will read - * the invalid intermediate value. Avoid problems by checking the - * microframe number (the low-order 3 bits); if they are 0 then - * re-read the register to get the correct value. - */ - uf = ehci_readl(ehci, &ehci->regs->frame_index); - if (unlikely(ehci->frame_index_bug && ((uf & 7) == 0))) - uf = ehci_readl(ehci, &ehci->regs->frame_index); - return uf; -} - -#endif - -/*-------------------------------------------------------------------------*/ - /* * periodic_next_shadow - return "next" pointer on shadow list * @periodic: host pointer to qh/itd/sitd diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index 9b8cbb4..ec948c3 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -776,22 +776,6 @@ static inline u32 hc32_to_cpup (const struct ehci_hcd *ehci, const __hc32 *x) static inline void ehci_vdbg(struct ehci_hcd *ehci, ...) {} #endif -#ifdef CONFIG_PCI - -/* For working around the MosChip frame-index-register bug */ -static unsigned ehci_read_frame_index(struct ehci_hcd *ehci); - -#else - -static inline unsigned ehci_read_frame_index(struct ehci_hcd *ehci) -{ - return ehci_readl(ehci, &ehci->regs->frame_index); -} - -#endif - -/*-------------------------------------------------------------------------*/ - #ifndef DEBUG #define STUB_DEBUG_FILES #endif /* DEBUG */ -- 2.7.4