From: David Daney <ddaney@caviumnetworks.com>
To: James Hogan <james.hogan@mips.com>
Cc: David Daney <david.daney@cavium.com>,
linux-mips@linux-mips.org, ralf@linux-mips.org,
netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
devel@driverdev.osuosl.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
"Steven J. Hill" <steven.hill@cavium.com>,
devicetree@vger.kernel.org, Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
Carlos Munoz <cmunoz@cavium.com>
Subject: Re: [PATCH v4 2/8] MIPS: Octeon: Enable LMTDMA/LMTST operations.
Date: Thu, 30 Nov 2017 15:09:33 -0800 [thread overview]
Message-ID: <c90ac3a5-7230-38ff-691a-3d94a25702cd@caviumnetworks.com> (raw)
In-Reply-To: <20171130225614.GJ27409@jhogan-linux.mipstec.com>
On 11/30/2017 02:56 PM, James Hogan wrote:
> On Thu, Nov 30, 2017 at 01:49:43PM -0800, David Daney wrote:
>> On 11/30/2017 01:36 PM, James Hogan wrote:
>>> On Tue, Nov 28, 2017 at 04:55:34PM -0800, David Daney wrote:
>>>> Signed-off-by: Carlos Munoz <cmunoz@cavium.com>
>>>> Signed-off-by: Steven J. Hill <Steven.Hill@cavium.com>
>>>> Signed-off-by: David Daney <david.daney@cavium.com>
>>>> ---
>>>> arch/mips/cavium-octeon/setup.c | 6 ++++++
>>>> arch/mips/include/asm/octeon/octeon.h | 12 ++++++++++--
>>>> 2 files changed, 16 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c
>>>> index a8034d0dcade..99e6a68bc652 100644
>>>> --- a/arch/mips/cavium-octeon/setup.c
>>>> +++ b/arch/mips/cavium-octeon/setup.c
>>>> @@ -609,6 +609,12 @@ void octeon_user_io_init(void)
>>>> #else
>>>> cvmmemctl.s.cvmsegenak = 0;
>>>> #endif
>>>> + if (OCTEON_IS_OCTEON3()) {
>>>> + /* Enable LMTDMA */
>>>> + cvmmemctl.s.lmtena = 1;
>>>> + /* Scratch line to use for LMT operation */
>>>> + cvmmemctl.s.lmtline = 2;
>>>
>>> Out of curiosity, is there significance to the value 2 and associated
>>> virtual address 0xffffffffffff8100, or is it pretty arbitrary?
>>
>> Yes, there is significance.
>>
>> CPU local memory starts at 0xffffffffffff8000, each line is 0x80 bytes.
>> so the 2nd line starts at 0xffffffffffff8100
>
> What I mean is, why is 2 chosen instead of any other value?
That is explained in the change log of patch 5/8:
1st 128-bytes: Use by IOBDMA
2nd 128-bytes: Reserved by kernel for scratch/TLS emulation.
3rd 128-bytes: OCTEON-III LMTLINE
>
> Cheers
> James
>
next prev parent reply other threads:[~2017-11-30 23:09 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-29 0:55 [PATCH v4 0/8] Cavium OCTEON-III network driver David Daney
2017-11-29 0:55 ` [PATCH v4 1/8] dt-bindings: Add Cavium Octeon Common Ethernet Interface David Daney
2017-11-29 2:01 ` Andrew Lunn
2017-11-29 2:54 ` David Daney
2017-11-29 0:55 ` [PATCH v4 2/8] MIPS: Octeon: Enable LMTDMA/LMTST operations David Daney
2017-11-30 21:36 ` James Hogan
2017-11-30 21:49 ` David Daney
2017-11-30 22:56 ` James Hogan
2017-11-30 23:09 ` David Daney [this message]
2017-11-30 23:12 ` James Hogan
2017-11-29 0:55 ` [PATCH v4 3/8] MIPS: Octeon: Add a global resource manager David Daney
2017-11-30 22:53 ` James Hogan
2017-12-01 1:51 ` David Daney
2017-12-01 7:53 ` Philippe Ombredanne
2017-12-01 17:42 ` David Daney
2017-12-01 19:49 ` Philippe Ombredanne
2017-12-01 20:01 ` David Daney
2017-12-01 20:41 ` Philippe Ombredanne
2017-12-01 20:56 ` David Daney
2017-12-01 23:33 ` Philippe Ombredanne
2017-11-29 0:55 ` [PATCH v4 4/8] MIPS: Octeon: Add Free Pointer Unit (FPA) support David Daney
2017-11-29 0:55 ` [PATCH v4 5/8] MIPS: Octeon: Automatically provision CVMSEG space David Daney
2017-11-29 0:55 ` [PATCH v4 6/8] staging: octeon: Remove USE_ASYNC_IOBDMA macro David Daney
2017-12-07 14:28 ` Greg Kroah-Hartman
2017-11-29 0:55 ` [PATCH v4 7/8] netdev: octeon-ethernet: Add Cavium Octeon III support David Daney
2017-11-29 10:30 ` Souptick Joarder
2017-11-29 13:47 ` Andrew Lunn
2017-11-29 16:07 ` Souptick Joarder
2017-11-29 19:11 ` Dan Carpenter
2017-11-29 22:16 ` Andrew Lunn
2017-11-29 19:20 ` David Daney
2017-11-30 7:12 ` Souptick Joarder
2017-11-29 22:56 ` Andrew Lunn
2017-11-29 23:04 ` David Daney
2017-11-29 0:55 ` [PATCH v4 8/8] MAINTAINERS: Add entry for drivers/net/ethernet/cavium/octeon/octeon3-* David Daney
2017-11-29 14:18 ` [PATCH v4 0/8] Cavium OCTEON-III network driver David Miller
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