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>
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0bb39ca1ad
Коммит
0759956f8a
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@ -594,6 +594,27 @@ static void dwc3_core_exit(struct dwc3 *dwc)
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phy_power_off(dwc->usb3_generic_phy);
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}
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static bool dwc3_core_is_valid(struct dwc3 *dwc)
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{
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u32 reg;
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reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
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/* This should read as U3 followed by revision number */
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if ((reg & DWC3_GSNPSID_MASK) == 0x55330000) {
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/* Detected DWC_usb3 IP */
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dwc->revision = reg;
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} else if ((reg & DWC3_GSNPSID_MASK) == 0x33310000) {
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/* Detected DWC_usb31 IP */
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dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER);
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dwc->revision |= DWC3_REVISION_IS_DWC31;
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} else {
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return false;
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}
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return true;
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}
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/**
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* dwc3_core_init - Low-level initialization of DWC3 Core
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* @dwc: Pointer to our controller context structure
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@ -606,16 +627,7 @@ static int dwc3_core_init(struct dwc3 *dwc)
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u32 reg;
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int ret;
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reg = dwc3_readl(dwc->regs, DWC3_GSNPSID);
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/* This should read as U3 followed by revision number */
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if ((reg & DWC3_GSNPSID_MASK) == 0x55330000) {
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/* Detected DWC_usb3 IP */
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dwc->revision = reg;
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} else if ((reg & DWC3_GSNPSID_MASK) == 0x33310000) {
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/* Detected DWC_usb31 IP */
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dwc->revision = dwc3_readl(dwc->regs, DWC3_VER_NUMBER);
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dwc->revision |= DWC3_REVISION_IS_DWC31;
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} else {
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if (!dwc3_core_is_valid(dwc)) {
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dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
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ret = -ENODEV;
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goto err0;
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