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Date:	Mon, 10 Mar 2014 16:10:31 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	monstr@...str.eu
CC:	Kedareswara rao Appana <appana.durga.rao@...inx.com>,
	wg@...ndegger.com, michal.simek@...inx.com,
	grant.likely@...aro.org, robh+dt@...nel.org,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Kedareswara rao Appana <appanad@...inx.com>
Subject: Re: [PATCH v5] can: xilinx CAN controller support.

On 03/10/2014 04:04 PM, Michal Simek wrote:
> Hi Marc,
> 
> On 03/10/2014 03:57 PM, Marc Kleine-Budde wrote:
>> On 03/04/2014 02:20 PM, Kedareswara rao Appana wrote:
>>> This patch adds xilinx CAN controller support.
>>> This driver supports both ZYNQ CANPS and Soft IP
>>> AXI CAN controller.
>>>
>>> Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
>>> ---
>>> This patch is rebased on the 3.14 rc5 kernel.
>>> Changes for v5:
>>> - Updated the driver with the review comments.
>>> - Remove the check for the tx fifo full interrupt condition
>>>   form Tx interrupt routine as we are checking it in the _xmit
>>>   routine.
>>> - Clearing the txok interrupt in the tx interrupt routine for
>>>   every Tx can frame.
>>> Changes for v4:
>>> - Added check for the tx fifo full interrupt condition in
>>>   Tx interrupt routine.
>>> - Added be iohelper functions.
>>> - Moved the clock enable/disable to probe/remove because of
>>>   Added big endian support for AXI CAN controller case(reading
>>>   a register during probe for that we need to enable clock).
>>> Changes for v3:
>>> - Updated the driver with the review comments.
>>> - Modified the tranmit logic as per Marc suggestion.
>>> - Enabling the clock when the interface is up to reduce the
>>>   Power consumption.
>>> Changes for v2:
>>> - Updated with the review comments.
>>> - Removed the unnecessary debug prints.
>>> - include tx,rx fifo depths in ZYNQ CANPS case also.
>>> ---
>>>  .../devicetree/bindings/net/can/xilinx_can.txt     |   45 +
>>>  drivers/net/can/Kconfig                            |    7 +
>>>  drivers/net/can/Makefile                           |    1 +
>>>  drivers/net/can/xilinx_can.c                       | 1195 ++++++++++++++++++++
>>>  4 files changed, 1248 insertions(+), 0 deletions(-)
>>>  create mode 100644 Documentation/devicetree/bindings/net/can/xilinx_can.txt
>>>  create mode 100644 drivers/net/can/xilinx_can.c
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/can/xilinx_can.txt b/Documentation/devicetree/bindings/net/can/xilinx_can.txt
>>> new file mode 100644
>>> index 0000000..0e57103
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/net/can/xilinx_can.txt
>>> @@ -0,0 +1,45 @@
>>> +Xilinx Axi CAN/Zynq CANPS controller Device Tree Bindings
>>> +---------------------------------------------------------
>>> +
>>> +Required properties:
>>> +- compatible		: Should be "xlnx,zynq-can-1.00.a" for Zynq CAN
>>> +			  controllers and "xlnx,axi-can-1.00.a" for Axi CAN
>>> +			  controllers.
>>> +- reg			: Physical base address and size of the Axi CAN/Zynq
>>> +			  CANPS registers map.
>>> +- interrupts		: Property with a value describing the interrupt
>>> +			  number.
>>> +- interrupt-parent	: Must be core interrupt controller
>>> +- clock-names		: List of input clock names - "ref_clk", "aper_clk"
>>> +			  (See clock bindings for details. Two clocks are
>>> +			   required for Zynq CAN. For Axi CAN
>>> +			   case it is one(ref_clk)).
>>> +- clocks		: Clock phandles (see clock bindings for details).
>>> +- tx-fifo-depth		: Can Tx fifo depth.
>>> +- rx-fifo-depth		: Can Rx fifo depth.
>>> +
>>> +
>>> +Example:
>>> +
>>> +For Zynq CANPS Dts file:
>>> +	zynq_can_0: zynq-can@...08000 {
>>> +			compatible = "xlnx,zynq-can-1.00.a";
>>> +			clocks = <&clkc 19>, <&clkc 36>;
>>> +			clock-names = "ref_clk", "aper_clk";
>>> +			reg = <0xe0008000 0x1000>;
>>> +			interrupts = <0 28 4>;
>>> +			interrupt-parent = <&intc>;
>>> +			tx-fifo-depth = <0x40>;
>>> +			rx-fifo-depth = <0x40>;
>>> +		};
>>> +For Axi CAN Dts file:
>>> +	axi_can_0: axi-can@...00000 {
>>> +			compatible = "xlnx,axi-can-1.00.a";
>>> +			clocks = <&clkc 0>;
>>> +			clock-names = "ref_clk" ;
>>> +			reg = <0x40000000 0x10000>;
>>> +			interrupt-parent = <&intc>;
>>> +			interrupts = <0 59 1>;
>>> +			tx-fifo-depth = <0x40>;
>>> +			rx-fifo-depth = <0x40>;
>>> +		};
>>> diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
>>> index 9e7d95d..b180239 100644
>>> --- a/drivers/net/can/Kconfig
>>> +++ b/drivers/net/can/Kconfig
>>> @@ -125,6 +125,13 @@ config CAN_GRCAN
>>>  	  endian syntheses of the cores would need some modifications on
>>>  	  the hardware level to work.
>>>  
>>> +config CAN_XILINXCAN
>>> +	tristate "Xilinx CAN"
>>> +	depends on ARCH_ZYNQ || MICROBLAZE
>>
>> Is Zynq multiarch already?
> 
> let me just answer this. Zynq is device with hardcoded dual arm cortex-a9 + some IPs
> and programmable logic.
> It means if you add Microblaze to PL or another CPU then you get multi architecture setup.

Sorry for the confusion, I'm not talking about
more-than-one-architecture-in-a-FPGA, but the feature of the ARM-Linux
Kernel to run on different ARM architecture. For example, it's possible
to start the same kernel on a freescale imx6 and a the new marvel ebu
platform. If the Zynq Kernel supports this feature, too, we should not
limit to ARCH_ZYNQ, but use ARM instead.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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