linux-kernel - Re: [PATCH v4 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC

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Message-ID: <1d5aec11-a7b5-01c2-6614-16e57c64511b@linux.intel.com>
Date:   Thu, 30 Apr 2020 17:07:03 +0800
From:   "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>
Cc:     qi-ming.wu@...el.com, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        cheol.yong.kim@...el.com, hauke.mehrtens@...el.com,
        anders.roxell@...aro.org, vigneshr@...com, arnd@...db.de,
        richard@....at, brendanhiggins@...gle.com,
        linux-mips@...r.kernel.org, robh+dt@...nel.org,
        miquel.raynal@...tlin.com, tglx@...utronix.de,
        masonccyang@...c.com.tw, andriy.shevchenko@...el.com
Subject: Re: [PATCH v4 2/2] mtd: rawnand: Add NAND controller support on Intel
 LGM SoC

Hi Boris,

On 30/4/2020 4:36 pm, Boris Brezillon wrote:
> On Thu, 30 Apr 2020 16:30:15 +0800
> "Ramuthevar, Vadivel MuruganX"
> <vadivel.muruganx.ramuthevar@...ux.intel.com> wrote:
> 
>>>>>
>>>>> And now I'd like you to explain why 5 is the right value for that field
>>>>> (I guess that has to do with the position of the CS/ALE/CLE pins).
>>>>
>>>> 5 : bit 26, 25, 24, 23, 22 to be included for comparison in the
>>>
>>> That's 6 bits to me, not 5.
>>
>> No , 5 bits only the above case.
> 
> Oops, right, sorry for the brain fart.
> 
>>>
>>> The question is, is it the same value we have in nand_pa or it is
>>> different?
>>>    
>> Different address which is 0xE1400000 NAND_BASE_PHY address.
> 
> Then why didn't you tell me they didn't match when I suggested to pass

sorry, because you keep asking nand_pa after that only I realized that.

> nand_pa? So now the question is, what does this address represent?

                EBU-MODULE
  _________     _______________________
|         |   |            |NAND CTRL  |
| FPI BUS |==>| CS0(0x174) | 0xE100    ( 0xE14/0xE1C) NAND_PHY_BASE
|_________|   |_CS1(0x17C)_|__________ |

EBU_CONRTROLLER_BASE : 0xE0F0_0000
HSNAND_BASE: 0xE100_0000
NAND_CS0: 0xE140_0000
NAND_CS1: 0xE1C0_0000

MEM_REGION_BASE_CS0: 0x17400 (internal to ebu controller )
MEM_REGION_BASE_CS1: 0x17C00

>Do you have a reference manual I can look at to understand what this is?

We dont have reference manual since it is new SoC, we keep get 
information from HW team and we have only register map

Thanks a lot !!!

Regards
Vadivel
>