linux-kernel - Re: [PATCH v5 1/4] pci: APM X-Gene PCIe controller driver

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Date:	Tue, 25 Mar 2014 14:52:49 -0700
From:	Tanmay Inamdar <tinamdar@....com>
To:	Phil.Edworthy@...esas.com
Cc:	Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Jon Masters <jcm@...hat.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-pci-owner@...r.kernel.org, Liviu Dudau <liviu.dudau@....com>,
	patches <patches@....com>, Rob Landley <rob@...dley.net>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v5 1/4] pci: APM X-Gene PCIe controller driver

Hello Phil,

Thanks for reviewing. Please see inline.

On Tue, Mar 25, 2014 at 1:52 AM,  <Phil.Edworthy@...esas.com> wrote:
> Hi Tanmay,
>
> On: 19/03/2014 23:15, Tanmay wrote:
>> Subject: [PATCH v5 1/4] pci: APM X-Gene PCIe controller driver
>> Sent by: linux-pci-owner@...r.kernel.org
>>
>> This patch adds the AppliedMicro X-Gene SOC PCIe controller driver.
>> X-Gene PCIe controller supports maximum up to 8 lanes and GEN3 speed.
>> X-Gene SOC supports maximum 5 PCIe ports.
> <snip>
>
>> +static void xgene_pcie_setup_ib_reg(struct xgene_pcie_port *port,
>> +                struct of_pci_range *range, u8 *ib_reg_mask)
>> +{
>> +   void __iomem *csr_base = port->csr_base;
>> +   void __iomem *cfg_base = port->cfg_base;
>> +   void *bar_addr;
>> +   void *pim_addr;
>> +   u64 restype = range->flags & IORESOURCE_TYPE_BITS;
>> +   u64 cpu_addr = range->cpu_addr;
>> +   u64 pci_addr = range->pci_addr;
>> +   u64 size = range->size;
>> +   u64 mask = ~(size - 1) | EN_REG;
>> +   u32 flags = PCI_BASE_ADDRESS_MEM_TYPE_64;
>> +   u32 bar_low;
>> +   int region;
>> +
>> +   region = xgene_pcie_select_ib_reg(ib_reg_mask, range->size);
>> +   if (region < 0) {
>> +      dev_warn(port->dev, "invalid pcie dma-range config\n");
>> +      return;
>> +   }
>> +
>> +   if (restype == PCI_BASE_ADDRESS_MEM_PREFETCH)
>> +      flags |= PCI_BASE_ADDRESS_MEM_PREFETCH;
>
> Since IORESOURCE_TYPE_BITS is 0x00001f00, and
> PCI_BASE_ADDRESS_MEM_PREFETCH is 0x08, this will never match. I think you
> are mixing up different sets of definitions here. Also, the address
> properties in range->flags are bitfields.

You are right. I will fix this.

>
> Regards
> Phil
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