usb: dwc3: core: add fifo space helper

this helper will be used, initially, to dump space
of different queues and fifos in dwc3 to
debugfs. Later, it'll be used to issue remote wakeup
when we want to start a transfer and there's
something in a TX FIFO.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 6f57929f09b4bb70919c53ec48ef0e5d56ca6c44..c050a88c16d4e367e1df782e9161044e5859d54f 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -60,6 +60,20 @@ void dwc3_set_mode(struct dwc3 *dwc, u32 mode)
        dwc3_writel(dwc->regs, DWC3_GCTL, reg);
 }
 
+u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type)
+{
+       struct dwc3             *dwc = dep->dwc;
+       u32                     reg;
+
+       dwc3_writel(dwc->regs, DWC3_GDBGFIFOSPACE,
+                       DWC3_GDBGFIFOSPACE_NUM(dep->number) |
+                       DWC3_GDBGFIFOSPACE_TYPE(type));
+
+       reg = dwc3_readl(dwc->regs, DWC3_GDBGFIFOSPACE);
+
+       return DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(reg);
+}
+
 /**
  * dwc3_core_soft_reset - Issues core soft reset and PHY reset
  * @dwc: pointer to our context structure

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 832da3f2e03acc63e302d11e33467b4c45afa5ff..c3ea4270bf334ed05935ddd9870ede6e32a0396e 100644 (file)
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -152,6 +152,19 @@
 
 /* Bit fields */
 
+/* Global Debug Queue/FIFO Space Available Register */
+#define DWC3_GDBGFIFOSPACE_NUM(n)      ((n) & 0x1f)
+#define DWC3_GDBGFIFOSPACE_TYPE(n)     (((n) << 5) & 0x1e0)
+#define DWC3_GDBGFIFOSPACE_SPACE_AVAILABLE(n) (((n) >> 16) & 0xffff)
+
+#define DWC3_TXFIFOQ           1
+#define DWC3_RXFIFOQ           3
+#define DWC3_TXREQQ            5
+#define DWC3_RXREQQ            7
+#define DWC3_RXINFOQ           9
+#define DWC3_DESCFETCHQ                13
+#define DWC3_EVENTQ            15
+
 /* Global Configuration Register */
 #define DWC3_GCTL_PWRDNSCALE(n)        ((n) << 19)
 #define DWC3_GCTL_U2RSTECN     (1 << 16)
@@ -1043,6 +1056,7 @@ struct dwc3_gadget_ep_cmd_params {
 
 /* prototypes */
 void dwc3_set_mode(struct dwc3 *dwc, u32 mode);
+u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type);
 
 /* check whether we are on the DWC_usb31 core */
 static inline bool dwc3_is_usb31(struct dwc3 *dwc)