[U-Boot] [PATCH 4/6] usb: dwc2: add helper function for setting SPLIT HC registers

Stefan Brüns
2016-01-17T03:09:54Z

The split register setting is used for both SSPLIT and CSPLIT transactions,
the bit for CSPLIT has to be set seperately.

Signed-off-by: Stefan Br?ns <stefan.bruens@rwth-aachen.de>
---
drivers/usb/host/dwc2.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
index 0e710d9..7fbbc4b 100644
--- a/drivers/usb/host/dwc2.c
+++ b/drivers/usb/host/dwc2.c
@@ -432,10 +432,23 @@ static void dwc_otg_hc_init(struct dwc2_core_regs *regs, uint8_t hc_num,
*/
writel(hcchar, &hc_regs->hcchar);

- /* Program the HCSPLIT register for SPLITs */
+ /* Program the HCSPLIT register, default to no SPLIT */
writel(0, &hc_regs->hcsplt);
}

+static void dwc_otg_hc_init_split(struct dwc2_hc_regs *hc_regs,
+ uint8_t hub_devnum, uint8_t hub_port)
+{
+ uint32_t hcsplt = 0;
+
+ hcsplt = DWC2_HCSPLT_SPLTENA;
+ hcsplt |= hub_devnum << DWC2_HCSPLT_HUBADDR_OFFSET;
+ hcsplt |= hub_port << DWC2_HCSPLT_PRTADDR_OFFSET;
+
+ /* Program the HCSPLIT register for SPLITs */
+ writel(hcsplt, &hc_regs->hcsplt);
+}
+
/*
* DWC2 to USB API interface
*/
--
2.1.4