usb: dwc3: core: add support for realtek SoCs custom's global register start address

The Realtek RTD SoCs were designed with the global register address
offset at 0x8100. The default address offset is constant at
DWC3_GLOBALS_REGS_START (0xc100). Therefore, add a check if the
compatible name of the parent is realtek,rtd-dwc3, then global
register start address will remap to 0x8100.

Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20230505025104.18321-1-stanley_chang@realtek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 0beaab9..278cd1c 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1800,6 +1800,17 @@ static int dwc3_probe(struct platform_device *pdev)
        dwc_res = *res;
        dwc_res.start += DWC3_GLOBALS_REGS_START;
 
+       if (dev->of_node) {
+               struct device_node *parent = of_get_parent(dev->of_node);
+
+               if (of_device_is_compatible(parent, "realtek,rtd-dwc3")) {
+                       dwc_res.start -= DWC3_GLOBALS_REGS_START;
+                       dwc_res.start += DWC3_RTK_RTD_GLOBALS_REGS_START;
+               }
+
+               of_node_put(parent);
+       }
+
        regs = devm_ioremap_resource(dev, &dwc_res);
        if (IS_ERR(regs))
                return PTR_ERR(regs);

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index d56457c..1968638 100644 (file)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -84,6 +84,8 @@
 #define DWC3_OTG_REGS_START            0xcc00
 #define DWC3_OTG_REGS_END              0xccff
 
+#define DWC3_RTK_RTD_GLOBALS_REGS_START        0x8100
+
 /* Global Registers */
 #define DWC3_GSBUSCFG0         0xc100
 #define DWC3_GSBUSCFG1         0xc104