[PATCH v2 04/16] usb: dwc3: add a flag to check if it is fpga board

Huang Rui
2014-10-17T08:53:29Z

Some chip vendor is on pre-silicon phase, which needs to use the simulation
board. It should have the same product and vendor id with the true soc, but
might have some minor different configurations.

Below thread discussion proposes to find a method to distinguish between
simulation board and soc.

http://marc.info/?l=linux-usb&m=141194772206369&w=2

In Andvanced Configuration of coreConsultant, there is the parameter of
DWC_USB_EN_FPGA. This bit has the function we need. And it would response as 7
bit of GHWPARAMS6 register. So it's able to check this functional bit to confirm
if works on FPGA board.

Reported-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
---
drivers/usb/dwc3/core.c | 6 ++++++
drivers/usb/dwc3/core.h | 5 +++++
2 files changed, 11 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index bf77509..ddac372 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -455,6 +455,12 @@ static int dwc3_core_init(struct dwc3 *dwc)
dev_dbg(dwc->dev, "No power optimization available\n");
}

+ /* check if current dwc3 is on simulation board */
+ if (dwc->hwparams.hwparams6 & DWC3_GHWPARAMS6_EN_FPGA) {
+ dev_dbg(dwc->dev, "it is on FPGA board\n");
+ dwc->is_fpga = true;
+ }
+
/*
* WORKAROUND: DWC3 revisions <1.90a have a bug
* where the device can fail to connect at SuperSpeed
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index a715ee1..f6ee623 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -210,6 +210,9 @@
#define DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(n) (((n) & (0x0f << 13)) >> 13)
#define DWC3_MAX_HIBER_SCRATCHBUFS 15

+/* Global HWPARAMS6 Register */
+#define DWC3_GHWPARAMS6_EN_FPGA (1 << 7)
+
/* Device Configuration Register */
#define DWC3_DCFG_DEVADDR(addr) ((addr) << 3)
#define DWC3_DCFG_DEVADDR_MASK DWC3_DCFG_DEVADDR(0x7f)
@@ -662,6 +665,7 @@ struct dwc3_scratchpad_array {
* @ep0_expect_in: true when we expect a DATA IN transfer
* @has_hibernation: true when dwc3 was configured with Hibernation
* @is_selfpowered: true when we are selfpowered
+ * @is_fpga: true when we are using the FPGA board
* @needs_fifo_resize: not all users might want fifo resizing, flag it
* @pullups_connected: true when Run/Stop bit is set
* @resize_fifos: tells us it's ok to reconfigure our TxFIFO sizes.
@@ -765,6 +769,7 @@ struct dwc3 {
unsigned ep0_expect_in:1;
unsigned has_hibernation:1;
unsigned is_selfpowered:1;
+ unsigned is_fpga:1;
unsigned needs_fifo_resize:1;
unsigned pullups_connected:1;
unsigned resize_fifos:1;
--
1.9.1