usb: dwc3: gadget: implement Global Command support

This will be used by the ep0 layer for implementing
Set SEL Standard Request.

Signed-off-by: Felipe Balbi <balbi@ti.com>

3 files changed, 32 insertions, 2 deletions

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 93f9973ad53e..42641ada9e2d 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -284,12 +284,14 @@
 #define DWC3_DGCMD_SET_ENDPOINT_NRDY    0x0c
 #define DWC3_DGCMD_RUN_SOC_BUS_LOOPBACK 0x10
 
+#define DWC3_DGCMD_STATUS(n)            (((n) >> 15) & 1)
+#define DWC3_DGCMD_CMDACT               (1 << 10)
+
 /* Device Endpoint Command Register */
 #define DWC3_DEPCMD_PARAM_SHIFT         16
 #define DWC3_DEPCMD_PARAM(x)            ((x) << DWC3_DEPCMD_PARAM_SHIFT)
 #define DWC3_DEPCMD_GET_RSC_IDX(x)     (((x) >> DWC3_DEPCMD_PARAM_SHIFT) & 0x7f)
-#define DWC3_DEPCMD_STATUS_MASK         (0x0f << 12)
-#define DWC3_DEPCMD_STATUS(x)           (((x) & DWC3_DEPCMD_STATUS_MASK) >> 12)
+#define DWC3_DEPCMD_STATUS(x)           (((x) >> 15) & 1)
 #define DWC3_DEPCMD_HIPRI_FORCERM       (1 << 11)
 #define DWC3_DEPCMD_CMDACT              (1 << 10)
 #define DWC3_DEPCMD_CMDIOC              (1 << 8)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 906db570ef4f..158d396d0d0c 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -276,6 +276,33 @@ static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
         }
 }
 
+int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
+{
+        u32             timeout = 500;
+        u32             reg;
+
+        dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
+        dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
+
+        do {
+                reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
+                if (!(reg & DWC3_DGCMD_CMDACT)) {
+                        dev_vdbg(dwc->dev, "Command Complete --> %d\n",
+                                        DWC3_DGCMD_STATUS(reg));
+                        return 0;
+                }
+
+                /*
+                 * We can't sleep here, because it's also called from
+                 * interrupt context.
+                 */
+                timeout--;
+                if (!timeout)
+                        return -ETIMEDOUT;
+                udelay(1);
+        } while (1);
+}
+
 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
                 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
 {
diff --git a/drivers/usb/dwc3/gadget.h b/drivers/usb/dwc3/gadget.h
index a8600084348c..95ef6a2f7764 100644
--- a/drivers/usb/dwc3/gadget.h
+++ b/drivers/usb/dwc3/gadget.h
@@ -111,6 +111,7 @@ int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
 int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value);
 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
                 unsigned cmd, struct dwc3_gadget_ep_cmd_params *params);
+int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param);
 
 /**
  * dwc3_gadget_ep_get_transfer_index - Gets transfer index from HW