1 files changed, 95 insertions, 52 deletions

diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index 405257f3e853..fc7c1614cf9e 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -394,8 +394,9 @@ struct ohci_hcd {
 #define OHCI_QUIRK_AMD756       0x01                    /* erratum #4 */
 #define OHCI_QUIRK_SUPERIO      0x02                    /* natsemi */
 #define OHCI_QUIRK_INITRESET    0x04                    /* SiS, OPTi, ... */
-#define OHCI_BIG_ENDIAN         0x08                    /* big endian HC */
-#define OHCI_QUIRK_ZFMICRO      0x10                    /* Compaq ZFMicro chipset*/
+#define OHCI_QUIRK_BE_DESC      0x08                    /* BE descriptors */
+#define OHCI_QUIRK_BE_MMIO      0x10                    /* BE registers */
+#define OHCI_QUIRK_ZFMICRO      0x20                    /* Compaq ZFMicro chipset*/
         // there are also chip quirks/bugs in init logic
 
 };
@@ -439,117 +440,156 @@ static inline struct usb_hcd *ohci_to_hcd (const struct ohci_hcd *ohci)
  * a minority (notably the IBM STB04XXX and the Motorola MPC5200
  * processors) implement them in big endian format.
  *
+ * In addition some more exotic implementations like the Toshiba
+ * Spider (aka SCC) cell southbridge are "mixed" endian, that is,
+ * they have a different endianness for registers vs. in-memory
+ * descriptors.
+ *
  * This attempts to support either format at compile time without a
  * runtime penalty, or both formats with the additional overhead
  * of checking a flag bit.
+ *
+ * That leads to some tricky Kconfig rules howevber. There are
+ * different defaults based on some arch/ppc platforms, though
+ * the basic rules are:
+ *
+ * Controller type              Kconfig options needed
+ * ---------------              ----------------------
+ * little endian                CONFIG_USB_OHCI_LITTLE_ENDIAN
+ *
+ * fully big endian             CONFIG_USB_OHCI_BIG_ENDIAN_DESC _and_
+ *                              CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
+ *
+ * mixed endian                 CONFIG_USB_OHCI_LITTLE_ENDIAN _and_
+ *                              CONFIG_USB_OHCI_BIG_ENDIAN_{MMIO,DESC}
+ *
+ * (If you have a mixed endian controller, you -must- also define
+ * CONFIG_USB_OHCI_LITTLE_ENDIAN or things will not work when building
+ * both your mixed endian and a fully big endian controller support in
+ * the same kernel image).
  */
 
-#ifdef CONFIG_USB_OHCI_BIG_ENDIAN
+#ifdef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
+#ifdef CONFIG_USB_OHCI_LITTLE_ENDIAN
+#define big_endian_desc(ohci)   (ohci->flags & OHCI_QUIRK_BE_DESC)
+#else
+#define big_endian_desc(ohci)   1               /* only big endian */
+#endif
+#else
+#define big_endian_desc(ohci)   0               /* only little endian */
+#endif
 
+#ifdef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
 #ifdef CONFIG_USB_OHCI_LITTLE_ENDIAN
-#define big_endian(ohci)        (ohci->flags & OHCI_BIG_ENDIAN) /* either */
+#define big_endian_mmio(ohci)   (ohci->flags & OHCI_QUIRK_BE_MMIO)
+#else
+#define big_endian_mmio(ohci)   1               /* only big endian */
+#endif
 #else
-#define big_endian(ohci)        1               /* only big endian */
+#define big_endian_mmio(ohci)   0               /* only little endian */
 #endif
 
 /*
  * Big-endian read/write functions are arch-specific.
  * Other arches can be added if/when they're needed.
+ *
+ * REVISIT: arch/powerpc now has readl/writel_be, so the
+ * definition below can die once the STB04xxx support is
+ * finally ported over.
  */
-#if defined(CONFIG_PPC)
+#if defined(CONFIG_PPC) && !defined(CONFIG_PPC_MERGE)
 #define readl_be(addr)          in_be32((__force unsigned *)addr)
 #define writel_be(val, addr)    out_be32((__force unsigned *)addr, val)
 #endif
 
-static inline unsigned int ohci_readl (const struct ohci_hcd *ohci,
-                                                        __hc32 __iomem * regs)
+static inline unsigned int _ohci_readl (const struct ohci_hcd *ohci,
+                                        __hc32 __iomem * regs)
 {
-        return big_endian(ohci) ? readl_be (regs) : readl ((__force u32 *)regs);
+        return big_endian_mmio(ohci) ?
+                readl_be ((__force u32 *)regs) :
+                readl ((__force u32 *)regs);
 }
 
-static inline void ohci_writel (const struct ohci_hcd *ohci,
-                                const unsigned int val, __hc32 __iomem *regs)
+static inline void _ohci_writel (const struct ohci_hcd *ohci,
+                                 const unsigned int val, __hc32 __iomem *regs)
 {
-        big_endian(ohci) ? writel_be (val, regs) :
-                           writel (val, (__force u32 *)regs);
+        big_endian_mmio(ohci) ?
+                writel_be (val, (__force u32 *)regs) :
+                writel (val, (__force u32 *)regs);
 }
 
-#else   /* !CONFIG_USB_OHCI_BIG_ENDIAN */
-
-#define big_endian(ohci)        0               /* only little endian */
-
 #ifdef CONFIG_ARCH_LH7A404
-        /* Marc Singer: at the time this code was written, the LH7A404
-         * had a problem reading the USB host registers.  This
-         * implementation of the ohci_readl function performs the read
-         * twice as a work-around.
-         */
-static inline unsigned int
-ohci_readl (const struct ohci_hcd *ohci, const __hc32 *regs)
-{
-        *(volatile __force unsigned int*) regs;
-        return *(volatile __force unsigned int*) regs;
-}
+/* Marc Singer: at the time this code was written, the LH7A404
+ * had a problem reading the USB host registers.  This
+ * implementation of the ohci_readl function performs the read
+ * twice as a work-around.
+ */
+#define ohci_readl(o,r)         (_ohci_readl(o,r),_ohci_readl(o,r))
+#define ohci_writel(o,v,r)      _ohci_writel(o,v,r)
 #else
-        /* Standard version of ohci_readl uses standard, platform
-         * specific implementation. */
-static inline unsigned int
-ohci_readl (const struct ohci_hcd *ohci, __hc32 __iomem * regs)
-{
-        return readl(regs);
-}
+#define ohci_readl(o,r)         _ohci_readl(o,r)
+#define ohci_writel(o,v,r)      _ohci_writel(o,v,r)
 #endif
 
-static inline void ohci_writel (const struct ohci_hcd *ohci,
-                                const unsigned int val, __hc32 __iomem *regs)
-{
-        writel (val, regs);
-}
-
-#endif  /* !CONFIG_USB_OHCI_BIG_ENDIAN */
 
 /*-------------------------------------------------------------------------*/
 
 /* cpu to ohci */
 static inline __hc16 cpu_to_hc16 (const struct ohci_hcd *ohci, const u16 x)
 {
-        return big_endian(ohci) ? (__force __hc16)cpu_to_be16(x) : (__force __hc16)cpu_to_le16(x);
+        return big_endian_desc(ohci) ?
+                (__force __hc16)cpu_to_be16(x) :
+                (__force __hc16)cpu_to_le16(x);
 }
 
 static inline __hc16 cpu_to_hc16p (const struct ohci_hcd *ohci, const u16 *x)
 {
-        return big_endian(ohci) ? cpu_to_be16p(x) : cpu_to_le16p(x);
+        return big_endian_desc(ohci) ?
+                cpu_to_be16p(x) :
+                cpu_to_le16p(x);
 }
 
 static inline __hc32 cpu_to_hc32 (const struct ohci_hcd *ohci, const u32 x)
 {
-        return big_endian(ohci) ? (__force __hc32)cpu_to_be32(x) : (__force __hc32)cpu_to_le32(x);
+        return big_endian_desc(ohci) ?
+                (__force __hc32)cpu_to_be32(x) :
+                (__force __hc32)cpu_to_le32(x);
 }
 
 static inline __hc32 cpu_to_hc32p (const struct ohci_hcd *ohci, const u32 *x)
 {
-        return big_endian(ohci) ? cpu_to_be32p(x) : cpu_to_le32p(x);
+        return big_endian_desc(ohci) ?
+                cpu_to_be32p(x) :
+                cpu_to_le32p(x);
 }
 
 /* ohci to cpu */
 static inline u16 hc16_to_cpu (const struct ohci_hcd *ohci, const __hc16 x)
 {
-        return big_endian(ohci) ? be16_to_cpu((__force __be16)x) : le16_to_cpu((__force __le16)x);
+        return big_endian_desc(ohci) ?
+                be16_to_cpu((__force __be16)x) :
+                le16_to_cpu((__force __le16)x);
 }
 
 static inline u16 hc16_to_cpup (const struct ohci_hcd *ohci, const __hc16 *x)
 {
-        return big_endian(ohci) ? be16_to_cpup((__force __be16 *)x) : le16_to_cpup((__force __le16 *)x);
+        return big_endian_desc(ohci) ?
+                be16_to_cpup((__force __be16 *)x) :
+                le16_to_cpup((__force __le16 *)x);
 }
 
 static inline u32 hc32_to_cpu (const struct ohci_hcd *ohci, const __hc32 x)
 {
-        return big_endian(ohci) ? be32_to_cpu((__force __be32)x) : le32_to_cpu((__force __le32)x);
+        return big_endian_desc(ohci) ?
+                be32_to_cpu((__force __be32)x) :
+                le32_to_cpu((__force __le32)x);
 }
 
 static inline u32 hc32_to_cpup (const struct ohci_hcd *ohci, const __hc32 *x)
 {
-        return big_endian(ohci) ? be32_to_cpup((__force __be32 *)x) : le32_to_cpup((__force __le32 *)x);
+        return big_endian_desc(ohci) ?
+                be32_to_cpup((__force __be32 *)x) :
+                le32_to_cpup((__force __le32 *)x);
 }
 
 /*-------------------------------------------------------------------------*/
@@ -557,6 +597,9 @@ static inline u32 hc32_to_cpup (const struct ohci_hcd *ohci, const __hc32 *x)
 /* HCCA frame number is 16 bits, but is accessed as 32 bits since not all
  * hardware handles 16 bit reads.  That creates a different confusion on
  * some big-endian SOC implementations.  Same thing happens with PSW access.
+ *
+ * FIXME: Deal with that as a runtime quirk when STB03xxx is ported over
+ * to arch/powerpc
  */
 
 #ifdef CONFIG_STB03xxx
@@ -568,7 +611,7 @@ static inline u32 hc32_to_cpup (const struct ohci_hcd *ohci, const __hc32 *x)
 static inline u16 ohci_frame_no(const struct ohci_hcd *ohci)
 {
         u32 tmp;
-        if (big_endian(ohci)) {
+        if (big_endian_desc(ohci)) {
                 tmp = be32_to_cpup((__force __be32 *)&ohci->hcca->frame_no);
                 tmp >>= OHCI_BE_FRAME_NO_SHIFT;
         } else
@@ -580,7 +623,7 @@ static inline u16 ohci_frame_no(const struct ohci_hcd *ohci)
 static inline __hc16 *ohci_hwPSWp(const struct ohci_hcd *ohci,
                                  const struct td *td, int index)
 {
-        return (__hc16 *)(big_endian(ohci) ?
+        return (__hc16 *)(big_endian_desc(ohci) ?
                         &td->hwPSW[index ^ 1] : &td->hwPSW[index]);
 }