From 890f0ee4bb454712c302bd9d235091cd3fe70931 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Stefan=20Br=C3=BCns?= <stefan.bruens@rwth-aachen.de>
Date: Sun, 17 Jan 2016 04:09:54 +0100
Subject: [PATCH] usb: dwc2: add helper function for setting SPLIT HC registers
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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 Brüns <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 0e710d9d8a..7fbbc4bc7f 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
*/
--
2.39.5