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usb: dwc3: add support for USB 2.0-only core configuration

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Newer DWC3 controllers can be built for USB 2.0-only mode, where
most of the USB 3.0 circuitry is left out. To support this mode,
the driver must limit the speed programmed into the DCFG register
to Hi-Speed or lower.

Reads and writes to the PIPECTL register are left as-is, since
they should be no-ops in USB 2.0-only mode. Calls to phy_init()
etc. for the USB3 phy are also left as-is, since the no-op USB3
phy should be used for USB 2.0-only mode controllers.

Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Paul Zimmerman 2014-05-23 11:39:24 -07:00 committed by Felipe Balbi
parent 5670017849
commit 0e1e5c47f7
2 changed files with 20 additions and 0 deletions
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7
drivers/usb/dwc3/core.c
View File

@ -386,6 +386,13 @@ static int dwc3_core_init(struct dwc3 *dwc)
}
dwc->revision = reg;
/* Handle USB2.0-only core configuration */
if (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
DWC3_GHWPARAMS3_SSPHY_IFC_DIS) {
if (dwc->maximum_speed == USB_SPEED_SUPER)
dwc->maximum_speed = USB_SPEED_HIGH;
}
/* issue device SoftReset too */
timeout = jiffies + msecs_to_jiffies(500);
dwc3_writel(dwc->regs, DWC3_DCTL, DWC3_DCTL_CSFTRST);

13
drivers/usb/dwc3/core.h
View File

@ -191,6 +191,19 @@
#define DWC3_GHWPARAMS1_PWROPT(n) ((n) << 24)
#define DWC3_GHWPARAMS1_PWROPT_MASK DWC3_GHWPARAMS1_PWROPT(3)
/* Global HWPARAMS3 Register */
#define DWC3_GHWPARAMS3_SSPHY_IFC(n) ((n) & 3)
#define DWC3_GHWPARAMS3_SSPHY_IFC_DIS 0
#define DWC3_GHWPARAMS3_SSPHY_IFC_ENA 1
#define DWC3_GHWPARAMS3_HSPHY_IFC(n) (((n) & (3 << 2)) >> 2)
#define DWC3_GHWPARAMS3_HSPHY_IFC_DIS 0
#define DWC3_GHWPARAMS3_HSPHY_IFC_UTMI 1
#define DWC3_GHWPARAMS3_HSPHY_IFC_ULPI 2
#define DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI 3
#define DWC3_GHWPARAMS3_FSPHY_IFC(n) (((n) & (3 << 4)) >> 4)
#define DWC3_GHWPARAMS3_FSPHY_IFC_DIS 0
#define DWC3_GHWPARAMS3_FSPHY_IFC_ENA 1
/* Global HWPARAMS4 Register */
#define DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(n) (((n) & (0x0f << 13)) >> 13)
#define DWC3_MAX_HIBER_SCRATCHBUFS 15