netdev - Re: [PATCH] ARM: OMAP: AM33XX: CAN: d_can: Add support for Bosch D

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Message-ID: <4F7AF1EC.1060802@pengutronix.de>
Date:	Tue, 03 Apr 2012 14:49:48 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Wolfgang Grandegger <wg@...ndegger.com>
CC:	AnilKumar Ch <anilkumar@...com>, socketcan@...tkopp.net,
	m.kleine-budde@...gutronix.de, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, anantgole@...com, nsekhar@...com
Subject: Re: [PATCH] ARM: OMAP: AM33XX: CAN: d_can: Add support for Bosch
 D_CAN controller

On 04/03/2012 02:44 PM, Wolfgang Grandegger wrote:
> On 04/03/2012 02:32 PM, AnilKumar Ch wrote:
>> This patch adds the support for Bosch D_CAN controller.
>>
>> Bosch D_CAN controller is a full-CAN implementation compliant to
>> CAN protocol version 2.0 part A and B. Bosch D_CAN user manual
>> can be obtained from: http://www.semiconductors.bosch.de/media/
>> en/pdf/ipmodules_1/can/d_can_users_manual_111.pdf
>>
>> D_CAN device is used on many SoCs like AM335x, DM8148 and DM813x
>> EVMs from TI, D_CAN details on AM335x can be accessed from:
>> http://www.ti.com/lit/ug/spruh73c/spruh73c.pdf
>>
>> D_CAN can be configurable for 16, 32, 64 and 128 message objects.
>> The driver implementation is based on 64 message objects.
>>
>> Following are the design choices made while writing the controller
>> driver:
>> 1. Interface Register set IF0 has be used for receive and IF1 is
>>    used for transmit message objects.
>> 2. Out of the total Message objects available, half of it are kept
>>    aside for RX purposes and the rest for TX purposes.
>> 3. NAPI implementation is such that both the TX and RX paths
>>    functions in polling mode.
>>
>> Signed-off-by: AnilKumar Ch <anilkumar@...com>
> 
> Please explain why this CAN controller cannot be handled by the existing
> C_CAN driver, eventually with some extensions. The register layout seems
> almost identical, at least.

ACK.

Have a look at the recent at91_can driver. It has been improved to work
with a flexible number of message objects.

Marc

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