// borrowed with some modifications from
// http://www.ee.ed.ac.uk/~gerard/Teach/Verilog/manual/Example/lrgeEx2/cooley.html
module up3down5(clock, data_in, up, down, carry_out, borrow_out, count_out, parity_out);

input [8:0] data_in;
input clock, up, down;

output reg [8:0] count_out;
output reg carry_out, borrow_out, parity_out;

reg [9:0] cnt_up, cnt_dn;
reg [8:0] count_nxt;

always @(posedge clock)
begin
	cnt_dn = count_out - 3'b 101;
	cnt_up = count_out + 2'b 11;

	case ({up,down})
		2'b 00 : count_nxt = data_in;
		2'b 01 : count_nxt = cnt_dn;
		2'b 10 : count_nxt = cnt_up;
		2'b 11 : count_nxt = count_out;
		default : count_nxt = 9'bX;
	endcase

	parity_out  <= ^count_nxt;
	carry_out   <= <
#
# Copyright (C) 2013 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#

CAN_MENU:=CAN Support

define KernelPackage/can
  SUBMENU:=$(CAN_MENU)
  TITLE:=CAN bus support
  KCONFIG:=\
	CONFIG_CAN=m \
	CONFIG_CAN_DEV \
	CONFIG_CAN_CALC_BITTIMING=y \
	CONFIG_CAN_LEDS=y \
	CONFIG_CAN_AT91=n \
	CONFIG_CAN_TI_HECC=n \
	CONFIG_CAN_MCP251X=n \
	CONFIG_CAN_BFIN=n \
	CONFIG_CAN_JANZ_ICAN3=n \
	CONFIG_PCH_CAN=n \
	CONFIG_CAN_GRCAN=n \
	CONFIG_CAN_CC770=n \
	CONFIG_CAN_MSCAN=n \
	CONFIG_CAN_SJA1000=n \
	CONFIG_CAN_SOFTING=n \
	CONFIG_NET_EMATCH_CANID=n \
	CONFIG_CAN_DEBUG_DEVICES=n
  FILES:=$(LINUX_DIR)/drivers/net/can/can-dev.ko \
	 $(LINUX_DIR)/net/can/can.ko
  AUTOLOAD:=$(call AutoProbe,can can-dev)
endef

define KernelPackage/can/description
 Kernel module for CAN bus support.
endef

$(eval $(call KernelPackage,can))


define AddDepends/can
  SUBMENU:=$(CAN_MENU)
  DEPENDS+=kmod-can $(1)
endef


define KernelPackage/can-bcm
  TITLE:=Broadcast Manager CAN Protcol
  KCONFIG:=CONFIG_CAN_BCM
  FILES:=$(LINUX_DIR)/net/can/can-bcm.ko
  AUTOLOAD:=$(call AutoProbe,can-bcm)
  $(call AddDepends/can)
endef

define KernelPackage/can-bcm/description
 The Broadcast Manager offers content filtering, timeout monitoring,
 sending of RTR frames, and cyclic CAN messages without permanent user
 interaction.
endef

$(eval $(call KernelPackage,can-bcm))


define KernelPackage/can-c-can
  TITLE:=BOSCH C_CAN/D_CAN drivers
  KCONFIG:=CONFIG_CAN_C_CAN
  FILES:=$(LINUX_DIR)/drivers/net/can/c_can/c_can.ko
  AUTOLOAD:=$(call AutoProbe,c_can)
  $(call AddDepends/can)
endef

define KernelPackage/can-c-can/description
 This driver adds generic support for the C_CAN/D_CAN chips.
endef

$(eval $(call KernelPackage,can-c-can))


define KernelPackage/can-c-can-pci
  TITLE:=PCI Bus based BOSCH C_CAN/D_CAN driver
  KCONFIG:=CONFIG_CAN_C_CAN_PCI
  DEPENDS:=kmod-can-c-can @PCI_SUPPORT
  FILES:=$(LINUX_DIR)/drivers/net/can/c_can/c_can_pci.ko
  AUTOLOAD:=$(call AutoProbe,c_can_pci)
  $(call AddDepends/can)
endef

define KernelPackage/can-c-can-pci/description
 This driver adds support for the C_CAN/D_CAN chips connected
 to the PCI bus.
endef

$(eval $(call KernelPackage,can-c-can-pci))


define KernelPackage/can-c-can-platform
  TITLE:=Platform Bus based BOSCH C_CAN/D_CAN driver
  KCONFIG:=CONFIG_CAN_C_CAN_PLATFORM
  DEPENDS:=kmod-can-c-can +kmod-regmap-core
  FILES:=$(LINUX_DIR)/drivers/net/can/c_can/c_can_platform.ko
  AUTOLOAD:=$(call AutoProbe,c_can_platform)
  $(call AddDepends/can)
endef

define KernelPackage/can-c-can-platform/description
 This driver adds support for the C_CAN/D_CAN chips connected
 to the "platform bus" (Linux abstraction for directly to the
 processor attached devices) which can be found on various
 boards from ST Microelectronics (http://www.st.com) like the
 SPEAr1310 and SPEAr320 evaluation boards & TI (www.ti.com)
 boards like am335x, dm814x, dm813x and dm811x.
endef

$(eval $(call KernelPackage,can-c-can-platform))


define KernelPackage/can-flexcan
  TITLE:=Support for Freescale FLEXCAN based chips
  KCONFIG:=CONFIG_CAN_FLEXCAN
  FILES:=$(LINUX_DIR)/drivers/net/can/flexcan.ko
  AUTOLOAD:=$(call AutoProbe,flexcan)
  $(call AddDepends/can,@TARGET_imx6)
endef

define KernelPackage/can-flexcan/description
 Freescale FLEXCAN CAN bus controller implementation.
endef

$(eval $(call KernelPackage,can-flexcan))


define KernelPackage/can-gw
  TITLE:=CAN Gateway/Router
  KCONFIG:=CONFIG_CAN_GW
  FILES:=$(LINUX_DIR)/net/can/can-gw.ko
  AUTOLOAD:=$(call AutoProbe,can-gw)
  $(call AddDepends/can)
endef

define KernelPackage/can-gw/description
 The CAN Gateway/Router is used to route (and modify) CAN frames.
endef

$(eval $(call KernelPackage,can-gw))


define KernelPackage/can-raw
  TITLE:=Raw CAN Protcol
  KCONFIG:=CONFIG_CAN_RAW
  FILES:=$(LINUX_DIR)/net/can/can-raw.ko
  AUTOLOAD:=$(call AutoProbe,can-raw)
  $(call AddDepends/can)
endef

define KernelPackage/can-raw/description
 The raw CAN protocol option offers access to the CAN bus via
 the BSD  socket API.
endef

$(eval $(call KernelPackage,can-raw))


define KernelPackage/can-slcan
  TITLE:=Serial / USB serial CAN Adaptors (slcan)
  KCONFIG:=CONFIG_CAN_SLCAN
  FILES:=$(LINUX_DIR)/drivers/net/can/slcan.ko
  AUTOLOAD:=$(call AutoProbe,slcan)
  $(call AddDepends/can)
endef

define KernelPackage/can-slcan/description
 CAN driver for several 'low cost' CAN interfaces that are attached
 via serial lines or via USB-to-serial adapters using the LAWICEL
 ASCII protocol.
endef

$(eval $(call KernelPackage,can-slcan))


define KernelPackage/can-usb-8dev
  TITLE:=8 devices USB2CAN interface
  KCONFIG:=CONFIG_CAN_8DEV_USB
  FILES:=$(LINUX_DIR)/drivers/net/can/usb/usb_8dev.ko
  AUTOLOAD:=$(call AutoProbe,usb_8dev)
  $(call AddDepends/can,+kmod-usb-core)
endef

define KernelPackage/can-usb-8dev/description
 This driver supports the USB2CAN interface
 from 8 devices (http://www.8devices.com).
endef

$(eval $(call KernelPackage,can-usb-8dev))


define KernelPackage/can-usb-ems
  TITLE:=EMS CPC-USB/ARM7 CAN/USB interface
  KCONFIG:=CONFIG_CAN_EMS_USB
  FILES:=$(LINUX_DIR)/drivers/net/can/usb/ems_usb.ko
  AUTOLOAD:=$(call AutoProbe,ems_usb)
  $(call AddDepends/can,+kmod-usb-core)
endef

define KernelPackage/can-usb-ems/description
 This driver is for the one channel CPC-USB/ARM7 CAN/USB interface
 from EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
endef

$(eval $(call KernelPackage,can-usb-ems))


define KernelPackage/can-usb-esd
  TITLE:=ESD USB/2 CAN/USB interface
  KCONFIG:=CONFIG_CAN_ESD_USB2
  FILES:=$(LINUX_DIR)/drivers/net/can/usb/esd_usb2.ko
  AUTOLOAD:=$(call AutoProbe,esd_usb2)
  $(call AddDepends/can,+kmod-usb-core)
endef

define KernelPackage/can-usb-esd/description
 This driver supports the CAN-USB/2 interface
 from esd electronic system design gmbh (http://www.esd.eu).
endef

$(eval $(call KernelPackage,can-usb-esd))


define KernelPackage/can-usb-kvaser
  TITLE:=Kvaser CAN/USB interface
  KCONFIG:=CONFIG_CAN_KVASER_USB
  FILES:= \
	$(LINUX_DIR)/drivers/net/can/usb/kvaser_usb.ko@lt4.19 \
	$(LINUX_DIR)/drivers/net/can/usb/kvaser_usb/kvaser_usb.ko@ge4.19
  AUTOLOAD:=$(call AutoProbe,kvaser_usb)
  $(call AddDepends/can,+kmod-usb-core)
endef

define KernelPackage/can-usb-kvaser/description
 This driver adds support for Kvaser CAN/USB devices like Kvaser
 Leaf Light.
endef

$(eval $(call KernelPackage,can-usb-kvaser))


define KernelPackage/can-usb-peak
  TITLE:=PEAK PCAN-USB/USB Pro interfaces
  KCONFIG:=CONFIG_CAN_PEAK_USB
  FILES:=$(LINUX_DIR)/drivers/net/can/usb/peak_usb/peak_usb.ko
  AUTOLOAD:=$(call AutoProbe,peak_usb)
  $(call AddDepends/can,+kmod-usb-core)
endef

define KernelPackage/can-usb-peak/description
 This driver supports the PCAN-USB and PCAN-USB Pro adapters
 from PEAK-System Technik (http://www.peak-system.com).
endef

$(eval $(call KernelPackage,can-usb-peak))


define KernelPackage/can-vcan
  TITLE:=Virtual Local CAN Interface (vcan)
  KCONFIG:=CONFIG_CAN_VCAN
  FILES:=$(LINUX_DIR)/drivers/net/can/vcan.ko
  AUTOLOAD:=$(call AutoProbe,vcan)
  $(call AddDepends/can)
endef

define KernelPackage/can-vcan/description
 Similar to the network loopback devices, vcan offers a
 virtual local CAN interface.
endef

$(eval $(call KernelPackage,can-vcan))

define KernelPackage/can-xilinx-can
  TITLE:=Xilinx CAN IP
  KCONFIG:=CONFIG_CAN_XILINXCAN
  FILES:=$(LINUX_DIR)/drivers/net/can/xilinx_can.ko
  AUTOLOAD:=$(call AutoProbe,xilinx_can)
  $(call AddDepends/can,@TARGET_zynq)
endef

define KernelPackage/can-xilinx-can/description
 Xilinx CAN driver. This driver supports both
 soft AXI CAN IP and Zynq CANPS IP.
endef

$(eval $(call KernelPackage,can-xilinx-can))