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usb: dwc3: core: introduce dwc3_core_is_valid() 

This little helper will be used to make sure we're
dealing with a valid Synopsys DWC3 or DWC3.1 core.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
hifive-unleashed-5.1
Felipe Balbi 2016-10-14 16:19:01 +03:00
parent 0bb39ca1ad
commit 0759956f8a
1 changed files with 22 additions and 10 deletions
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32
drivers/usb/dwc3/core.c
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@ -594,6 +594,27 @@ static void dwc3_core_exit(struct dwc3 *dwc)
phy_power_off(dwc->usb3_generic_phy);
}
static bool dwc3_core_is_valid(struct dwc3 *dwc)
{
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
/* This should read as U3 followed by revision number */
if ((reg & DWC3_GSNPSID_MASK) == 0x55330000) {
/* Detected DWC_usb3 IP */
dwc->revision = reg;
} else if ((reg & DWC3_GSNPSID_MASK) == 0x33310000) {
/* Detected DWC_usb31 IP */
dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER);
dwc->revision |= DWC3_REVISION_IS_DWC31;
} else {
return false;
}
return true;
}
/**
* dwc3_core_init - Low-level initialization of DWC3 Core
* @dwc: Pointer to our controller context structure
@ -606,16 +627,7 @@ static int dwc3_core_init(struct dwc3 *dwc)
u32 reg;
int ret;
reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
/* This should read as U3 followed by revision number */
if ((reg & DWC3_GSNPSID_MASK) == 0x55330000) {
/* Detected DWC_usb3 IP */
dwc->revision = reg;
} else if ((reg & DWC3_GSNPSID_MASK) == 0x33310000) {
/* Detected DWC_usb31 IP */
dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER);
dwc->revision |= DWC3_REVISION_IS_DWC31;
} else {
if (!dwc3_core_is_valid(dwc)) {
dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
ret = -ENODEV;
goto err0;