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ENGR00120698 iMX28 add usb write register work around

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mx28 require read arc register before write.

Signed-off-by: Frank Li <Frank.Li@freescale.com>
This commit is contained in:
Frank Li
2010-02-05 13:19:12 +08:00
committed by Matt Sealey
parent 4b91878877
commit 37dccd44a7
2 changed files with 18 additions and 0 deletions
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8
drivers/usb/gadget/Kconfig
View File

@@ -489,6 +489,14 @@ config USB_ARC
default USB_GADGET
select USB_GADGET_SELECTED
config WORKAROUND_ARCUSB_REG_RW
bool "work around mx28 arch register write"
depends on ARCH_MX28 && USB_ARC
default ARCH_MX28
help
MX28 require read ARC register before write. Use SWP intructure to
implement this requirement.
config USB_GADGET_LANGWELL
boolean "Intel Langwell USB Device Controller"
depends on PCI

10
drivers/usb/gadget/arcotg_udc.c
View File

@@ -119,9 +119,19 @@ dr_wake_up_enable(struct fsl_udc *udc, bool enable)
pdata->wake_up_enable(pdata, enable);
}
#ifdef CONFIG_WORKAROUND_ARCUSB_REG_RW
static void safe_writel(u32 val32, void *addr)
{
__asm__ ("swp %0, %0, [%1]" : : "r"(val32), "r"(addr));
}
#endif
#ifdef CONFIG_PPC32
#define fsl_readl(addr) in_le32((addr))
#define fsl_writel(addr, val32) out_le32((val32), (addr))
#elif defined (CONFIG_WORKAROUND_ARCUSB_REG_RW)
#define fsl_readl(addr) readl((addr))
#define fsl_writel(val32, addr) safe_writel(val32, addr)
#else
#define fsl_readl(addr) readl((addr))
#define fsl_writel(addr, val32) writel((addr), (val32))