[U-Boot] [PATCH 12/13] at91: add hardware i2c drivers

[Heiko Schocher <hs@denx.de>]

Hello Jean-Christophe,

Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 07:53 Mon 30 Mar     , Heiko Schocher wrote:
>> Hello Jean,
>>
>> Jean-Christophe PLAGNIOL-VILLARD wrote:
>>> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
>>> ---
>>>  cpu/arm926ejs/at91/Makefile                        |    6 +
>>>  .../arm926ejs/at91/at91cap9_i2c.c                  |   31 ++--
>>>  .../arm926ejs/at91/at91sam9260_i2c.c               |   31 ++--
>>>  .../arm926ejs/at91/at91sam9261_i2c.c               |   31 ++--
>>>  .../arm926ejs/at91/at91sam9263_i2c.c               |   31 ++--
>>>  .../clk.h => cpu/arm926ejs/at91/at91sam9rl_i2c.c   |   37 ++--
>>>  drivers/i2c/Makefile                               |    1 +
>>>  drivers/i2c/atmel_i2c.c                            |  234 ++++++++++++++++++++
>>>  include/asm-arm/arch-at91/at91_common.h            |    2 +
>>>  include/asm-arm/arch-at91/at91_twi.h               |   68 ++++++
>>>  include/asm-arm/arch-at91/clk.h                    |    4 +
>>>  include/asm-arm/arch-at91/hardware.h               |    5 +
>>>  12 files changed, 405 insertions(+), 76 deletions(-)
>>>  copy include/asm-arm/arch-at91/at91_common.h => cpu/arm926ejs/at91/at91cap9_i2c.c (61%)
>>>  copy include/asm-arm/arch-at91/at91_common.h => cpu/arm926ejs/at91/at91sam9260_i2c.c (61%)
>>>  copy include/asm-arm/arch-at91/at91_common.h => cpu/arm926ejs/at91/at91sam9261_i2c.c (61%)
>>>  copy include/asm-arm/arch-at91/at91_common.h => cpu/arm926ejs/at91/at91sam9263_i2c.c (61%)
>>>  copy include/asm-arm/arch-at91/clk.h => cpu/arm926ejs/at91/at91sam9rl_i2c.c (52%)
>>>  create mode 100644 drivers/i2c/atmel_i2c.c
>>>  create mode 100644 include/asm-arm/arch-at91/at91_twi.h
>>>
>>>   
>> [...]
>>> diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
>>> index 9c74657..27a5251 100644
>>> --- a/drivers/i2c/Makefile
>>> +++ b/drivers/i2c/Makefile
>>> @@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
>>>  
>>>  LIB	:= $(obj)libi2c.a
>>>  
>>> +COBJS-$(CONFIG_I2C_ATMEL) += atmel_i2c.o
>>>  COBJS-$(CONFIG_BFIN_TWI_I2C) += bfin-twi_i2c.o
>>>  COBJS-$(CONFIG_FSL_I2C) += fsl_i2c.o
>>>  COBJS-$(CONFIG_I2C_MXC) += mxc_i2c.o
>>>   
>> Independent from your patch, I think we need here a common
>> rule. Either we name in future this define "CONFIG_I2C_XXX"
>> or "CONFIG_XXX_I2C. I vote for using "CONFIG_I2C_XXX"
> it's plan to clean up the driver CONFIG_ just before send the Kconfig patch
> series

Ah, ok, thanks.

>>> + *
>>> +*/
>>> +#include <common.h>
>>> +
>>> +#ifdef CONFIG_HARD_I2C
>>>   
>> Why not "#if defined(CONFIG_I2C_ATMEL)" as in the Makefile?
> until the Kconfig I'll prefer to keep the CONFIG_HARD_I2C

ok.

>>> +
>>> +#include <i2c.h>
>>> +#include <asm/io.h>
>>>   
>> [...]
>>> +	if (alen > 1)
>>> +		return 1;
>>> +	/* XXX assume an ATMEL AT24C16 */

[...]

>>> diff --git a/include/asm-arm/arch-at91/at91_twi.h b/include/asm-arm/arch-at91/at91_twi.h
>>> new file mode 100644
>>> index 0000000..bb2880f
>>> --- /dev/null
>>> +++ b/include/asm-arm/arch-at91/at91_twi.h
>>> @@ -0,0 +1,68 @@
>>> +/*
>>> + * arch/arm/mach-at91/include/mach/at91_twi.h
>>> + *
>>> + * Copyright (C) 2005 Ivan Kokshaysky
>>> + * Copyright (C) SAN People
>>> + *
>>> + * Two-wire Interface (TWI) registers.
>>> + * Based on AT91RM9200 datasheet revision E.
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License as published by
>>> + * the Free Software Foundation; either version 2 of the License, or
>>> + * (at your option) any later version.
>>> + */
>>> +
>>> +#ifndef AT91_TWI_H
>>> +#define AT91_TWI_H
>>> +
>>> +#define	AT91_TWI_CR		0x00		/* Control Register */
>>> +#define		AT91_TWI_START		(1 <<  0)	/* Send a Start Condition */
>>> +#define		AT91_TWI_STOP		(1 <<  1)	/* Send a Stop Condition */
>>> +#define		AT91_TWI_MSEN		(1 <<  2)	/* Master Transfer Enable */
>>> +#define		AT91_TWI_MSDIS		(1 <<  3)	/* Master Transfer Disable */
>>> +#define		AT91_TWI_SVEN		(1 <<  4)	/* Slave Transfer Enable [SAM9260 only] */
>>> +#define		AT91_TWI_SVDIS		(1 <<  5)	/* Slave Transfer Disable [SAM9260 only] */
>>> +#define		AT91_TWI_SWRST		(1 <<  7)	/* Software Reset */
>>>   
>>                  ^^^^^^^^^^^^^^^
>>                  doule tabs breaks line length (this affects for the
>> whole file)
>>
> I'll prefer to keep it as it because it's an import from Linux

Hmm.. maybe this should be fixed in Linux too.

bye
Heiko
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