linux-kernel - Re: [PATCH 8/8] pch_gbe: Add MinnowBoard support

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Message-ID: <68829d6a-a419-49a7-9df9-c9fa80f45aed@email.android.com>
Date:	Tue, 25 Jun 2013 20:25:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Darren Hart <dvhart@...ux.intel.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	danders@...cuitco.com, vishal.l.verma@...el.com,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 8/8] pch_gbe: Add MinnowBoard support

The same subsystem (not subdevice!) ID is used for all devices on the Minnowboard itself.

Bjorn Helgaas <bhelgaas@...gle.com> wrote:

>On Tue, Jun 25, 2013 at 7:53 PM, Darren Hart <dvhart@...ux.intel.com>
>wrote:
>> The MinnowBoard uses an AR803x PHY with the PCH GBE.
>>
>> It does not implement the RGMII 2ns TX clock delay in the trace
>routing
>> nor via strapping. Add a detection method for the board and the PHY
>and
>> enable the tx clock delay via the registers.
>>
>> This PHY will hibernate without link for 10 seconds. Ensure the PHY
>is
>> awake for probe and then disable hibernation. A future improvement
>would
>> be to convert pch_gbe to using PHYLIB and making sure we can wake the
>> PHY at the necessary times rather than permanently disabling it.
>>
>> Use the MinnowBoard PCI subsystem ID to identify the board and setup
>the
>> appropriate callbacks in a new pci_id driver_data structure.
>>
>> Signed-off-by: Darren Hart <dvhart@...ux.intel.com>
>> Cc: "David S. Miller" <davem@...emloft.net>
>> Cc: "H. Peter Anvin" <hpa@...or.com>
>> Cc: Peter Waskiewicz <peter.p.waskiewicz.jr@...el.com>
>> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>> Cc: netdev@...r.kernel.org
>> ---
>>  drivers/net/ethernet/oki-semi/pch_gbe/Kconfig      |  1 +
>>  drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe.h    |  2 +
>>  .../net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c   | 32 ++++++++
>>  .../net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.c    | 89
>++++++++++++++++++++++
>>  .../net/ethernet/oki-semi/pch_gbe/pch_gbe_phy.h    |  2 +
>>  5 files changed, 126 insertions(+)
>> ...
>
>> diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
>b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
>> index 6667a6b..6f0b9e3 100644
>> --- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
>> +++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
>>...
>> +static struct pch_gbe_privdata pch_gbe_minnowboard_privdata = {
>> +       .phy_reset = minnow_phy_reset,
>> +       .phy_tx_clk_delay = pch_gbe_phy_tx_clk_delay,
>> +};
>> +
>>  static DEFINE_PCI_DEVICE_TABLE(pch_gbe_pcidev_id) = {
>>         {.vendor = PCI_VENDOR_ID_INTEL,
>>          .device = PCI_DEVICE_ID_INTEL_IOH1_GBE,
>> +        .subvendor = PCI_VENDOR_ID_CIRCUITCO,
>> +        .subdevice = PCI_DEVICE_ID_CIRCUITCO_MINNOWBOARD,
>
>"MINNOWBOARD" seems like a pretty generic name for something that
>probably refers only to the gigabit ethernet device in the EG20T.  If
>you expect to use that same subdevice ID on other devices, I guess we
>can add PCI_DEVICE_ID_CIRCUITCO_MINNOWBOARD to pci_ids.h.  If it will
>only be used for the gigabit ethernet device, we would normally not
>add a #define for it and would just use the hex constant here (see the
>comment at the top of pci_ids.h).
>
>> +        .class = (PCI_CLASS_NETWORK_ETHERNET << 8),
>> +        .class_mask = (0xFFFF00),
>> +        .driver_data = (unsigned long) &pch_gbe_minnowboard_privdata
>> +        },
>> +       {.vendor = PCI_VENDOR_ID_INTEL,
>> +        .device = PCI_DEVICE_ID_INTEL_IOH1_GBE,
>>          .subvendor = PCI_ANY_ID,
>>          .subdevice = PCI_ANY_ID,
>>          .class = (PCI_CLASS_NETWORK_ETHERNET << 8),

-- 
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