RE: [PATCH v2 08/10] PCI: layerscape: Add EP mode support for ls1088a and ls2088a

[Xiaowei Bao <xiaowei.bao@nxp.com>]

> -----Original Message-----
> From: christophe leroy <christophe.leroy@c-s.fr>
> Sent: 2019年8月24日 14:45
> To: Xiaowei Bao <xiaowei.bao@nxp.com>; Andrew Murray
> <andrew.murray@arm.com>
> Cc: mark.rutland@arm.com; Roy Zang <roy.zang@nxp.com>;
> lorenzo.pieralisi@arm.co; arnd@arndb.de; devicetree@vger.kernel.org;
> gregkh@linuxfoundation.org; linuxppc-dev@lists.ozlabs.org;
> linux-pci@vger.kernel.org; linux-kernel@vger.kernel.org; kishon@ti.com; M.h.
> Lian <minghuan.lian@nxp.com>; robh+dt@kernel.org;
> gustavo.pimentel@synopsys.com; jingoohan1@gmail.com;
> bhelgaas@google.com; Leo Li <leoyang.li@nxp.com>; shawnguo@kernel.org;
> Mingkai Hu <mingkai.hu@nxp.com>; linux-arm-kernel@lists.infradead.org
> Subject: Re: [PATCH v2 08/10] PCI: layerscape: Add EP mode support for
> ls1088a and ls2088a
> 
> 
> 
> Le 24/08/2019 à 02:18, Xiaowei Bao a écrit :
> >
> >
> >> -----Original Message-----
> >> From: Andrew Murray <andrew.murray@arm.com>
> >> Sent: 2019年8月23日 22:28
> >> To: Xiaowei Bao <xiaowei.bao@nxp.com>
> >> Cc: bhelgaas@google.com; robh+dt@kernel.org; mark.rutland@arm.com;
> >> shawnguo@kernel.org; Leo Li <leoyang.li@nxp.com>; kishon@ti.com;
> >> lorenzo.pieralisi@arm.co; arnd@arndb.de; gregkh@linuxfoundation.org;
> M.h.
> >> Lian <minghuan.lian@nxp.com>; Mingkai Hu <mingkai.hu@nxp.com>; Roy
> >> Zang <roy.zang@nxp.com>; jingoohan1@gmail.com;
> >> gustavo.pimentel@synopsys.com; linux-pci@vger.kernel.org;
> >> devicetree@vger.kernel.org; linux-kernel@vger.kernel.org;
> >> linux-arm-kernel@lists.infradead.org; linuxppc-dev@lists.ozlabs.org
> >> Subject: Re: [PATCH v2 08/10] PCI: layerscape: Add EP mode support
> >> for ls1088a and ls2088a
> >>
> >> On Thu, Aug 22, 2019 at 07:22:40PM +0800, Xiaowei Bao wrote:
> >>> Add PCIe EP mode support for ls1088a and ls2088a, there are some
> >>> difference between LS1 and LS2 platform, so refactor the code of the
> >>> EP driver.
> >>>
> >>> Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
> >>> ---
> >>> v2:
> >>>   - New mechanism for layerscape EP driver.
> >>
> >> Was there a v1 of this patch?
> >
> > Yes, but I don't know how to comments, ^_^
> 
> As far as I can see, in the previous version of the series
> (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatch
> work.ozlabs.org%2Fproject%2Flinuxppc-dev%2Flist%2F%3Fseries%3D125315
> %26state%3D*&amp;data=02%7C01%7Cxiaowei.bao%40nxp.com%7C1befe9
> a67c8046f9535e08d7285eaab6%7C686ea1d3bc2b4c6fa92cd99c5c301635%
> 7C0%7C0%7C637022259387139020&amp;sdata=p4wbycd04Z7qRUfAoZtwc
> UP7pR%2FuA3%2FjVcWMz6YyQVQ%3D&amp;reserved=0),
> the 8/10 was something completely different, and I can't find any other patch
> in the series that could have been the v1 of this patch.

Thanks, I will correct it to v1 in next version patch.

> 
> Christophe
> 
> >
> >>
> >>>
> >>>   drivers/pci/controller/dwc/pci-layerscape-ep.c | 76
> >>> ++++++++++++++++++++------
> >>>   1 file changed, 58 insertions(+), 18 deletions(-)
> >>>
> >>> diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> >>> b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> >>> index 7ca5fe8..2a66f07 100644
> >>> --- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
> >>> +++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
> >>> @@ -20,27 +20,29 @@
> >>>
> >>>   #define PCIE_DBI2_OFFSET		0x1000	/* DBI2 base address*/
> >>>
> >>> -struct ls_pcie_ep {
> >>> -	struct dw_pcie		*pci;
> >>> -	struct pci_epc_features	*ls_epc;
> >>> +#define to_ls_pcie_ep(x)	dev_get_drvdata((x)->dev)
> >>> +
> >>> +struct ls_pcie_ep_drvdata {
> >>> +	u32				func_offset;
> >>> +	const struct dw_pcie_ep_ops	*ops;
> >>> +	const struct dw_pcie_ops	*dw_pcie_ops;
> >>>   };
> >>>
> >>> -#define to_ls_pcie_ep(x)	dev_get_drvdata((x)->dev)
> >>> +struct ls_pcie_ep {
> >>> +	struct dw_pcie			*pci;
> >>> +	struct pci_epc_features		*ls_epc;
> >>> +	const struct ls_pcie_ep_drvdata *drvdata; };
> >>>
> >>>   static int ls_pcie_establish_link(struct dw_pcie *pci)  {
> >>>   	return 0;
> >>>   }
> >>>
> >>> -static const struct dw_pcie_ops ls_pcie_ep_ops = {
> >>> +static const struct dw_pcie_ops dw_ls_pcie_ep_ops = {
> >>>   	.start_link = ls_pcie_establish_link,  };
> >>>
> >>> -static const struct of_device_id ls_pcie_ep_of_match[] = {
> >>> -	{ .compatible = "fsl,ls-pcie-ep",},
> >>> -	{ },
> >>> -};
> >>> -
> >>>   static const struct pci_epc_features*
> >>> ls_pcie_ep_get_features(struct dw_pcie_ep *ep)  { @@ -82,10 +84,44
> >>> @@ static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
> >>>   	}
> >>>   }
> >>>
> >>> -static const struct dw_pcie_ep_ops pcie_ep_ops = {
> >>> +static unsigned int ls_pcie_ep_func_conf_select(struct dw_pcie_ep *ep,
> >>> +						u8 func_no)
> >>> +{
> >>> +	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> >>> +	struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
> >>> +	u8 header_type;
> >>> +
> >>> +	header_type = ioread8(pci->dbi_base + PCI_HEADER_TYPE);
> >>> +
> >>> +	if (header_type & (1 << 7))
> >>> +		return pcie->drvdata->func_offset * func_no;
> >>> +	else
> >>> +		return 0;
> >>
> >> It looks like there isn't a PCI define for multi function, the
> >> nearest I could find was PCI_HEADER_TYPE_MULTIDEVICE in
> >> hotplug/ibmphp.h. A comment above the test might be helpful to explain
> the test.
> >
> > Yes, I have not find the PCI_HEADER_TYPE_MULTIDEVICE define. OK, I
> > will add The comments in next version patch.
> >
> >>
> >> As the ls_pcie_ep_drvdata structures are static, the unset
> >> .func_offset will be initialised to 0, so you could just drop the test above.
> >
> > OK, thanks
> >
> >>
> >> However something to the effect of the following may help spot
> >> misconfiguration:
> >>
> >> WARN_ON(func_no && !pcie->drvdata->func_offset); return
> >> pcie->drvdata->func_offset * func_no;
> >
> > Thanks a lot, this looks better.
> >
> >>
> >> The WARN is probably quite useful as if you are attempting to use
> >> non-zero functions and func_offset isn't set - then things may appear
> >> to work normally but actually will break horribly.
> >
> > got it, thanks.
> >
> >>
> >> Thanks,
> >>
> >> Andrew Murray
> >>
> >>> +}
> >>> +
> >>> +static const struct dw_pcie_ep_ops ls_pcie_ep_ops = {
> >>>   	.ep_init = ls_pcie_ep_init,
> >>>   	.raise_irq = ls_pcie_ep_raise_irq,
> >>>   	.get_features = ls_pcie_ep_get_features,
> >>> +	.func_conf_select = ls_pcie_ep_func_conf_select, };
> >>> +
> >>> +static const struct ls_pcie_ep_drvdata ls1_ep_drvdata = {
> >>> +	.ops = &ls_pcie_ep_ops,
> >>> +	.dw_pcie_ops = &dw_ls_pcie_ep_ops, };
> >>> +
> >>> +static const struct ls_pcie_ep_drvdata ls2_ep_drvdata = {
> >>> +	.func_offset = 0x20000,
> >>> +	.ops = &ls_pcie_ep_ops,
> >>> +	.dw_pcie_ops = &dw_ls_pcie_ep_ops, };
> >>> +
> >>> +static const struct of_device_id ls_pcie_ep_of_match[] = {
> >>> +	{ .compatible = "fsl,ls1046a-pcie-ep", .data = &ls1_ep_drvdata },
> >>> +	{ .compatible = "fsl,ls1088a-pcie-ep", .data = &ls2_ep_drvdata },
> >>> +	{ .compatible = "fsl,ls2088a-pcie-ep", .data = &ls2_ep_drvdata },
> >>> +	{ },
> >>>   };
> >>>
> >>>   static int __init ls_add_pcie_ep(struct ls_pcie_ep *pcie, @@ -98,7
> >>> +134,7 @@ static int __init ls_add_pcie_ep(struct ls_pcie_ep *pcie,
> >>>   	int ret;
> >>>
> >>>   	ep = &pci->ep;
> >>> -	ep->ops = &pcie_ep_ops;
> >>> +	ep->ops = pcie->drvdata->ops;
> >>>
> >>>   	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> >> "addr_space");
> >>>   	if (!res)
> >>> @@ -137,14 +173,11 @@ static int __init ls_pcie_ep_probe(struct
> >> platform_device *pdev)
> >>>   	if (!ls_epc)
> >>>   		return -ENOMEM;
> >>>
> >>> -	dbi_base = platform_get_resource_byname(pdev,
> IORESOURCE_MEM,
> >> "regs");
> >>> -	pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
> >>> -	if (IS_ERR(pci->dbi_base))
> >>> -		return PTR_ERR(pci->dbi_base);
> >>> +	pcie->drvdata = of_device_get_match_data(dev);
> >>>
> >>> -	pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_OFFSET;
> >>>   	pci->dev = dev;
> >>> -	pci->ops = &ls_pcie_ep_ops;
> >>> +	pci->ops = pcie->drvdata->dw_pcie_ops;
> >>> +
> >>>   	pcie->pci = pci;
> >>>
> >>>   	ls_epc->linkup_notifier = false,
> >>> @@ -152,6 +185,13 @@ static int __init ls_pcie_ep_probe(struct
> >>> platform_device *pdev)
> >>>
> >>>   	pcie->ls_epc = ls_epc;
> >>>
> >>> +	dbi_base = platform_get_resource_byname(pdev,
> IORESOURCE_MEM,
> >> "regs");
> >>> +	pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
> >>> +	if (IS_ERR(pci->dbi_base))
> >>> +		return PTR_ERR(pci->dbi_base);
> >>> +
> >>> +	pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_OFFSET;
> >>> +
> >>>   	platform_set_drvdata(pdev, pcie);
> >>>
> >>>   	ret = ls_add_pcie_ep(pcie, pdev);
> >>> --
> >>> 2.9.5
> >>>
> 
> ---
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