net: can: Introduce MEN 16Z192-00 CAN controller driver

    This CAN Controller is found on MEN Chameleon FPGAs.

    The driver/device supports the CAN2.0 specification.
    There are 255 RX and 255 Tx buffer within the IP. The
    pointer for the buffer are handled by HW to make the
    access from within the driver as simple as possible.

    The driver also supports parameters to configure the
    buffer level interrupt for RX/TX as well as a RX timeout
    interrupt using ethtool.

    With this configuration options, the driver/device
    provides flexibility for different types of usecases.

    Changes in version 2:
    Since the hardware does not have TX-done notification,
    the local loopback mechanism is implemented using ECHO skbs.
    The skb is added to echo stack, upon packet reception,
    received and echo skb are matched.

    LED trigger support is added.

    Changes in version 3:
    Fixed compiler warning.

    Changes in version 4:
    Implemented the module parameters using ethtool coalesce.
    Removed LED trigger implementation. Used FIELD_GET and
    FIELD_PREP for setting and getting register values. Replaced
    some hard-coded values with macros.

    Changes in version 5:
    Fixed compiler warning.

Signed-off-by: Abhijeet Badurkar <abhijeet.badurkar@duagon.com>

drivers/net/can/Kconfig

@@ -133,6 +133,16 @@ config CAN_KVASER_PCIEFD
 	    Kvaser Mini PCI Express HS v2
 	    Kvaser Mini PCI Express 2xHS v2
 
+config CAN_MEN_Z192
+	depends on MCB
+	tristate "MEN 16Z192-00 CAN Controller"
+	  help
+	  Driver for MEN 16Z192-00 CAN Controller IP-Core, which
+	  is connected to the MEN Chameleon Bus.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called men_z192_can.ko.
+
 config CAN_SUN4I
 	tristate "Allwinner A10 CAN controller"
 	depends on MACH_SUN4I || MACH_SUN7I || COMPILE_TEST

drivers/net/can/Makefile

@@ -26,6 +26,7 @@ obj-$(CONFIG_CAN_GRCAN)		+= grcan.o
 obj-$(CONFIG_CAN_IFI_CANFD)	+= ifi_canfd/
 obj-$(CONFIG_CAN_JANZ_ICAN3)	+= janz-ican3.o
 obj-$(CONFIG_CAN_KVASER_PCIEFD)	+= kvaser_pciefd.o
+obj-$(CONFIG_CAN_MEN_Z192)	+= men_z192_can.o
 obj-$(CONFIG_CAN_MSCAN)		+= mscan/
 obj-$(CONFIG_CAN_M_CAN)		+= m_can/
 obj-$(CONFIG_CAN_PEAK_PCIEFD)	+= peak_canfd/