linux-kernel - RE: [PATCH 2/2] pci: Add PCIe driver for Rockchip Soc

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Date:	Fri, 27 May 2016 07:13:29 +0000
From:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:	Wenrui Li <wenrui.li@...k-chips.com>,
	Arnd Bergmann <arnd@...db.de>,
	"Shawn Lin" <shawn.lin@...k-chips.com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>,
	"Rob Herring" <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Doug Anderson <dianders@...omium.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-rockchip@...ts.infradead.org" 
	<linux-rockchip@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] pci: Add PCIe driver for Rockchip Soc

> >
> >> +
> >> +static int rockchip_pcie_rd_other_conf(struct rockchip_pcie_port *pp,
> >> +				       struct pci_bus *bus, u32 devfn,
> >> +				       int where, int size, u32 *val)
> >> +{
> >> +	u32 busdev;
> >> +
> >> +	busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
> >> +				PCI_FUNC(devfn), where);
> >> +
> >> +	if (busdev & (size - 1)) {
> >> +		*val = 0;
> >> +		return PCIBIOS_BAD_REGISTER_NUMBER;
> >> +	}
> >> +
> >> +	if (size == 4) {
> >> +		*val = readl(pp->reg_base + busdev);
> >> +	} else if (size == 2) {
> >> +		*val = readw(pp->reg_base + busdev);
> >> +	} else if (size == 1) {
> >> +		*val = readb(pp->reg_base + busdev);
> >> +	} else {
> >> +		*val = 0;
> >> +		return PCIBIOS_BAD_REGISTER_NUMBER;
> >> +	}
> >> +	return PCIBIOS_SUCCESSFUL;
> >> +}
> >> +
> >
> > This looks like the normal ECAM operations, you could just call those.
> 
> I read ECAM reference code, I found it not support ioremap config space
> for each bus individually on 64-bit systems. Our soc is 64-bit system,
> and bus0 config space base address is 0xfda00000, bus1 base address is
> 0xf8100000. So I think it is not normal ECAM operations, I do not know
> if I have understood correctly?
> 
Hi,

I think Arnd was suggesting to use generic config read/write calls, pci_generic_config_read/pci_generic_config_write
which does above functionality.

Bharat