linux-kernel - Re: [PATCH v6 10/10] PCI: imx6: Add i.MX8Q PCIe root complex (RC) support

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Message-ID: <ZoL1ZgfQFucAEqoP@lizhi-Precision-Tower-5810>
Date: Mon, 1 Jul 2024 14:28:54 -0400
From: Frank Li <Frank.li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-pci@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v6 10/10] PCI: imx6: Add i.MX8Q PCIe root complex (RC)
 support

On Sun, Jun 30, 2024 at 10:21:03PM +0530, Manivannan Sadhasivam wrote:
> On Mon, Jun 17, 2024 at 04:16:46PM -0400, Frank Li wrote:
> > From: Richard Zhu <hongxing.zhu@....com>
> > 
> > Implement i.MX8Q (i.MX8QM, i.MX8QXP, and i.MX8DXL) PCIe RC support. While
> > the controller resembles that of iMX8MP, the PHY differs significantly.
> > Notably, there's a distinction between PCI bus addresses and CPU addresses.
> 
> Do we know the reason?

It is IC hardware design. Some high bits of address was changed in HSIO
subsystem.

Frank

> 
> > 
> > Introduce IMX_PCIE_FLAG_CPU_ADDR_FIXUP in drvdata::flags to indicate driver
> > need the cpu_addr_fixup() callback to facilitate CPU address to PCI bus
> > address conversion according to "range" property.
> 
> 'ranges'
> 
> > 
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 35 +++++++++++++++++++++++++++++++++++
> >  1 file changed, 35 insertions(+)
> > 
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > index 18c133f5a56fc..d2533d889d120 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -66,6 +66,7 @@ enum imx_pcie_variants {
> >  	IMX8MQ,
> >  	IMX8MM,
> >  	IMX8MP,
> > +	IMX8Q,
> >  	IMX95,
> >  	IMX8MQ_EP,
> >  	IMX8MM_EP,
> > @@ -81,6 +82,7 @@ enum imx_pcie_variants {
> >  #define IMX_PCIE_FLAG_HAS_PHY_RESET		BIT(5)
> >  #define IMX_PCIE_FLAG_HAS_SERDES		BIT(6)
> >  #define IMX_PCIE_FLAG_SUPPORT_64BIT		BIT(7)
> > +#define IMX_PCIE_FLAG_CPU_ADDR_FIXUP		BIT(8)
> >  
> >  #define imx_check_flag(pci, val)     (pci->drvdata->flags & val)
> >  
> > @@ -1012,6 +1014,22 @@ static void imx_pcie_host_exit(struct dw_pcie_rp *pp)
> >  		regulator_disable(imx_pcie->vpcie);
> >  }
> >  
> > +static u64 imx_pcie_cpu_addr_fixup(struct dw_pcie *pcie, u64 cpu_addr)
> > +{
> > +	struct imx_pcie *imx_pcie = to_imx_pcie(pcie);
> > +	struct dw_pcie_rp *pp = &pcie->pp;
> > +	struct resource_entry *entry;
> > +	unsigned int offset;
> > +
> > +	if (!(imx_pcie->drvdata->flags & IMX_PCIE_FLAG_CPU_ADDR_FIXUP))
> > +		return cpu_addr;
> > +
> > +	entry = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
> > +	offset = entry->offset;
> > +
> > +	return (cpu_addr - offset);
> > +}
> > +
> >  static const struct dw_pcie_host_ops imx_pcie_host_ops = {
> >  	.init = imx_pcie_host_init,
> >  	.deinit = imx_pcie_host_exit,
> > @@ -1020,6 +1038,7 @@ static const struct dw_pcie_host_ops imx_pcie_host_ops = {
> >  static const struct dw_pcie_ops dw_pcie_ops = {
> >  	.start_link = imx_pcie_start_link,
> >  	.stop_link = imx_pcie_stop_link,
> > +	.cpu_addr_fixup = imx_pcie_cpu_addr_fixup,
> >  };
> >  
> >  static void imx_pcie_ep_init(struct dw_pcie_ep *ep)
> > @@ -1449,6 +1468,13 @@ static int imx_pcie_probe(struct platform_device *pdev)
> >  		if (ret < 0)
> >  			return ret;
> >  
> > +		if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_CPU_ADDR_FIXUP)) {
> > +			if (!resource_list_first_type(&pci->pp.bridge->windows, IORESOURCE_MEM)) {
> > +				dw_pcie_host_deinit(&pci->pp);
> > +				return dev_err_probe(dev, -EINVAL, "DTS Miss PCI memory range");
> 
> -ENODEV
> 
> - Mani
> 
> -- 
> மணிவண்ணன் சதாசிவம்