linux-kernel - Re: [PATCH 11/37] PCI: dwc: Split pcie-designware.c into host and core files

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Date:   Mon, 16 Jan 2017 10:51:48 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Joao Pinto <Joao.Pinto@...opsys.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Arnd Bergmann <arnd@...db.de>
CC:     <linux-pci@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-samsung-soc@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-arm-kernel@...s.com>,
        <linux-arm-msm@...r.kernel.org>, <nsekhar@...com>
Subject: Re: [PATCH 11/37] PCI: dwc: Split pcie-designware.c into host and
 core files

Hi Joao,

On Friday 13 January 2017 10:19 PM, Joao Pinto wrote:
> Às 10:26 AM de 1/12/2017, Kishon Vijay Abraham I escreveu:
>> Split pcie-designware.c into pcie-designware-host.c that contains
>> the host specific parts of the driver and pcie-designware.c that
>> contains the parts used by both host driver and endpoint driver.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>  drivers/pci/dwc/Makefile               |    2 +-
>>  drivers/pci/dwc/pcie-designware-host.c |  619 ++++++++++++++++++++++++++++++++
>>  drivers/pci/dwc/pcie-designware.c      |  613 +------------------------------
>>  drivers/pci/dwc/pcie-designware.h      |    8 +
>>  4 files changed, 634 insertions(+), 608 deletions(-)
>>  create mode 100644 drivers/pci/dwc/pcie-designware-host.c
>>
>> diff --git a/drivers/pci/dwc/Makefile b/drivers/pci/dwc/Makefile
>> index 7d27c14..3b57e55 100644
>> --- a/drivers/pci/dwc/Makefile
>> +++ b/drivers/pci/dwc/Makefile
>> @@ -1,4 +1,4 @@
> 
> (snip...)
> 
>> -static void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
>> -				      int type, u64 cpu_addr, u64 pci_addr,
>> -				      u32 size)
>> +void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
>> +			       u64 cpu_addr, u64 pci_addr, u32 size)
>>  {
>>  	u32 retries, val;
>>  
>> @@ -186,220 +151,6 @@ static void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
>>  	dev_err(pci->dev, "iATU is not being enabled\n");
>>  }
> 
> Kishon, iATU only makes sense in The Root Complex (host), so it should be inside
> the pcie-designware-host.

That is not true. Outbound ATU should be programmed to access host side buffers
and inbound ATU should be programmed for the host to access EP mem space.

Thanks
Kishon