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usb: dwc2: Make dwc2_readl/writel functions endianness-agnostic.

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Declared dwc2_check_core_endianness() function for dynamicly check
core endianness.
Added needs_byte_swap flag to hsotg structure, and depending on
flag swap value inside dwc2_readl/writel functions.

Signed-off-by: Gevorg Sahakyan <sahakyan@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Gevorg Sahakyan
2018-07-27 12:26:29 +04:00
committed by Felipe Balbi
parent b138e23d3d
commit fe369e1826
2 changed files with 32 additions and 2 deletions
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19
drivers/usb/dwc2/platform.c
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@@ -352,6 +352,23 @@ static void dwc2_driver_shutdown(struct platform_device *dev)
disable_irq(hsotg->irq);
}
/**
* dwc2_check_core_endianness() - Returns true if core and AHB have
* opposite endianness.
* @hsotg: Programming view of the DWC_otg controller.
*/
static bool dwc2_check_core_endianness(struct dwc2_hsotg *hsotg)
{
u32 snpsid;
snpsid = ioread32(hsotg->regs + GSNPSID);
if ((snpsid & GSNPSID_ID_MASK) == DWC2_OTG_ID ||
(snpsid & GSNPSID_ID_MASK) == DWC2_FS_IOT_ID ||
(snpsid & GSNPSID_ID_MASK) == DWC2_HS_IOT_ID)
return false;
return true;
}
/**
* dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
* driver
@@ -395,6 +412,8 @@ static int dwc2_driver_probe(struct platform_device *dev)
dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
(unsigned long)res->start, hsotg->regs);
hsotg->needs_byte_swap = dwc2_check_core_endianness(hsotg);
retval = dwc2_lowlevel_hw_init(hsotg);
if (retval)
return retval;