[U-Boot] [PATCH v8 1/9] mips: add base support for QCA/Atheros ath79 SOCs

[Marek Vasut]

On 03/17/2016 05:02 AM, Wills Wang wrote:
> 
> 
> On Thursday, March 17, 2016 11:44 AM, Marek Vasut wrote:
>> On 03/17/2016 04:39 AM, Wills Wang wrote:
>>>
>>> On Thursday, March 17, 2016 05:35 AM, Marek Vasut wrote:
>>>> On 03/16/2016 09:59 AM, Wills Wang wrote:
>>>>> This patch add some common code for QCA/Atheros ath79 SOCs such as
>>>>> DDR tuning, chip reset and CPU detection.
>>>>>
>>>>> Signed-off-by: Wills Wang <wills.wang at live.com>
>>>>> ---
>>>>>
>>>>> Changes in v8:
>>>>> - Use setbits_be32
>>>>> - Use lookup-table instead of big switch statement for CPU detection
>>>>>
>>>> Good stuff, minor nits below.
>> [...]
>>
>>>>> +phys_size_t initdram(int board_type)
>>>>> +{
>>>>> +    ddr_tap_tuning();
>>>> Is the DDR tap tuning needed on all AR7xxx/AR9xxx systems ?
>>> Yes, it's for optimizing DDR timing according to hardware.
>>> Sometimes, the hard code value is not ideal.
>> AR934x doesn't seem to need this.
> I seem the following code in u-boot from Atheros LSDK:
> #ifdef CONFIG_AP123
>     ath_ddr_tap_cal();

Where can I get the LSDK ? I'd like to take a look and add it into my
ar934x support patch.

>>>>> +    return get_ram_size((void *)KSEG1, SZ_256M);
>>>>> +}
>>>>> diff --git a/arch/mips/mach-ath79/include/mach/ar71xx_regs.h
>>>>> b/arch/mips/mach-ath79/include/mach/ar71xx_regs.h
>>>>> new file mode 100644
>>>>> index 0000000..893dedc
>>>>> --- /dev/null
>>>>> +++ b/arch/mips/mach-ath79/include/mach/ar71xx_regs.h
>>>>> @@ -0,0 +1,1184 @@
>>>>> +/*
>>>>> + * Atheros AR71XX/AR724X/AR913X SoC register definitions
>>>>> + *
>>>>> + * Copyright (C) 2015-2016 Wills Wang <wills.wang at live.com>
>>>>> + * Copyright (C) 2010-2011 Jaiganesh Narayanan
>>>>> <jnarayanan at atheros.com>
>>>>> + * Copyright (C) 2008-2010 Gabor Juhos <juhosg at openwrt.org>
>>>>> + * Copyright (C) 2008 Imre Kaloz <kaloz at openwrt.org>
>>>>> + *
>>>>> + * SPDX-License-Identifier:     GPL-2.0+
>>>>> + */
>>>>> +
>>>>> +#ifndef __ASM_MACH_AR71XX_REGS_H
>>>>> +#define __ASM_MACH_AR71XX_REGS_H
>>>>> +
>>>>> +#ifndef __ASSEMBLY__
>>>>> +#include <linux/bitops.h>
>>>>> +#else
>>>>> +#ifndef BIT
>>>>> +#define BIT(nr)                 (1 << (nr))
>>>> This should really go into some common header.
>>> This header is also included by some assembly code,
>>> but the BIT macro in linux/bitops.h isn't compatiable with assembler.
>> Because of the 1UL in it ?
> Yes, there are also a few other C keywords and syntax, such as in-line
> function.

Hmmmmm, it pains me to see such duplication, but I have no better idea
how to deal with it without introducing ifdefs.

-- 
Best regards,
Marek Vasut