[U-Boot] arm, i2c: added support for the TWSI I2C Interface

[Heiko Schocher]

Hello Prafulla,

Prafulla Wadaskar wrote:
>> -----Original Message-----
>> From: Heiko Schocher [mailto:hs at denx.de] 
>> Sent: Thursday, July 16, 2009 1:31 PM
>> To: Jean-Christophe PLAGNIOL-VILLARD; Prafulla Wadaskar
>> Cc: U-Boot user list
>> Subject: arm, i2c: added support for the TWSI I2C Interface
>>
>> added support for the Hardware I2C TWSI Interface on
>> kirkwood SOCs, based on the Linux driver, without IRQ
>> support.
>>
>> Tested on a ARM926EJS (CPU Core Version FEROCEON_88FR131
>> SOC Family: KIRKWOOD, KW88F6281) based suen3 board
>>
>> Signed-off-by: Heiko Schocher <hs at denx.de>
>> ---
>>  drivers/i2c/Makefile      |    1 +
>>  drivers/i2c/mv64xxx-i2c.c |  452 
> Can you rename this? 

Of course, what name do you prefer?

>> +++++++++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 453 insertions(+), 0 deletions(-)
>>  create mode 100644 drivers/i2c/mv64xxx-i2c.c
>>
>> diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
>> index ef32f13..ce30111 100644
>> --- a/drivers/i2c/Makefile
>> +++ b/drivers/i2c/Makefile
>> @@ -33,6 +33,7 @@ COBJS-$(CONFIG_DRIVER_OMAP1510_I2C) += 
>> omap1510_i2c.o
>>  COBJS-$(CONFIG_DRIVER_OMAP24XX_I2C) += omap24xx_i2c.o
>>  COBJS-$(CONFIG_DRIVER_OMAP34XX_I2C) += omap24xx_i2c.o
>>  COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o
>> +COBJS-$(CONFIG_I2C_MV64xxx) += mv64xxx-i2c.o
> Put this in order

What do you mean?

>>  COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o
>>  COBJS-$(CONFIG_SOFT_I2C) += soft_i2c.o
>>  COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
>> diff --git a/drivers/i2c/mv64xxx-i2c.c b/drivers/i2c/mv64xxx-i2c.c
>> new file mode 100644
>> index 0000000..6ba2782
>> --- /dev/null
>> +++ b/drivers/i2c/mv64xxx-i2c.c
>> @@ -0,0 +1,452 @@
>> +/*
>> + * Driver for the i2c controller on the Marvell line of host bridges
>> + * (e.g, gt642[46]0, mv643[46]0, mv644[46]0, and Orion SoC family).
> Pls add kirkwood too..

OK.

>> + *
>> + * Based on:
>> + * Author: Mark A. Greer <mgreer at mvista.com>
>> + *
>> + * 2005 (c) MontaVista, Software, Inc.  This file is licensed under
>> + * the terms of the GNU General Public License version 2.  
>> This program
>> + * is licensed "as is" without any warranty of any kind, 
>> whether express
>> + * or implied.
>> + *
>> + * ported from Linux to u-boot
>> + * (C) Copyright 2009
>> + * Heiko Schocher, DENX Software Engineering, hs at denx.de.
>> + *
>> + */
>> +#include <common.h>
>> +#include <i2c.h>
>> +#include <asm/arch/kirkwood.h>
>> +#include <asm/errno.h>
>> +#include <asm/io.h>
>> +
>> +DECLARE_GLOBAL_DATA_PTR;
>> +
>> +static unsigned int i2c_bus_num __attribute__ ((section 
>> (".data"))) = 0;
>> +#if defined(CONFIG_I2C_MUX)
>> +static unsigned int i2c_bus_num_mux __attribute__ ((section 
>> ("data"))) = 0;
>> +#endif
>> +
>> +/* Register defines */
>> +#define	MV64XXX_I2C_REG_SLAVE_ADDR			0x00
>> +#define	MV64XXX_I2C_REG_DATA				0x04
> MV64XX does not sound generic supported SoCs,
> Can you choose better name? like TWSI.

Ah, OK. Used the names from the Linux driver. So I think above define
for selecting this drivers should be something like that:

CONFIG_DRIVER_I2C_TWSI ... (I vote for using CONFIG_DRIVER_I2C_ for
new drivers and maybe I find some time renaming the existing drivers to
this format...)

and replace MV64xxx with TWSI ... right?

> I will go through in details latter on

OK, thanks in advance.

bye
Heiko
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