[U-Boot] [PATCH 063/126] x86: pci: Add a function to decode a PCI BDF

[Simon Glass]

Hi Bin,

On Mon, 7 Oct 2019 at 07:53, Bin Meng <bmeng.cn at gmail.com> wrote:
>
> On Wed, Sep 25, 2019 at 10:58 PM Simon Glass <sjg at chromium.org> wrote:
> >
> > Early in boot it is necessary to decode the PCI device/function values for
> > particular peripherals in the device tree or of-platdata. Add functions to
> > handle this.
> >
> > Signed-off-by: Simon Glass <sjg at chromium.org>
> > ---
> >
> >  arch/x86/cpu/pci.c         | 18 ++++++++++++++++++
> >  arch/x86/include/asm/pci.h | 22 ++++++++++++++++++++++
> >  2 files changed, 40 insertions(+)
> >
> > diff --git a/arch/x86/cpu/pci.c b/arch/x86/cpu/pci.c
> > index e1aae158ce5..f551fef5bbb 100644
> > --- a/arch/x86/cpu/pci.c
> > +++ b/arch/x86/cpu/pci.c
> > @@ -69,6 +69,24 @@ int pci_x86_clrset_config(pci_dev_t bdf, uint offset, ulong clr, ulong set,
> >         return pci_x86_write_config(bdf, offset, value, size);
> >  }
> >
> > +#if !CONFIG_IS_ENABLED(OF_PLATDATA)
> > +int pci_x86_get_devfn(struct udevice *dev)
> > +{
> > +       struct fdt_pci_addr addr;
> > +       int ret;
> > +
> > +       /* Extract the devfn from fdt_pci_addr */
> > +       ret = ofnode_read_pci_addr(dev_ofnode(dev), FDT_PCI_SPACE_CONFIG,
> > +                                  "reg", &addr);
> > +       if (ret) {
> > +               if (ret != -ENOENT)
> > +                       return -EINVAL;
> > +       }
> > +
> > +       return addr.phys_hi & 0xff00;
> > +}
> > +#endif
>
> This function is a duplicates of pci_get_devfn() in pci-uclass driver.

Yes that's right. But with TPL we don't enable UCLASS_PCI to save code
size, so we need it somewhere else.

>
> > +
> >  void pci_assign_irqs(int bus, int device, u8 irq[4])
> >  {
> >         pci_dev_t bdf;
> > diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> > index 2a720735728..abb770760f5 100644
> > --- a/arch/x86/include/asm/pci.h
> > +++ b/arch/x86/include/asm/pci.h
> > @@ -60,6 +60,28 @@ int pci_x86_write_config(pci_dev_t bdf, uint offset, ulong value,
> >  int pci_x86_clrset_config(pci_dev_t bdf, uint offset, ulong clr, ulong set,
> >                           enum pci_size_t size);
> >
> > +/**
> > + * pci_x86_get_devfn() - Extract the devfn from fdt_pci_addr of the device
> > + *
> > + * Get devfn from fdt_pci_addr of the specified device. This is a copy of
> > + * pci_get_devfn() for use in TPL on x86, since PCI may not be available.
> > + *
> > + * @dev:       PCI device
> > + * @return devfn in bits 15...8 if found, -ENODEV if not found
> > + */
> > +int pci_x86_get_devfn(struct udevice *dev);
> > +
> > +/**
> > + * pci_x86_ofplat_get_devfn() - Get the PCI dev/fn from ofplat reg data
> > + *
> > + * @reg: reg value from dt-platdata.c array (first member)
> > + * @return device/function for that device
> > + */
> > +static inline pci_dev_t pci_x86_ofplat_get_devfn(u32 reg)
>
> Why returns pci_dev_t instead of int? This is inconsistent with the
> pci_x86_get_devfn() above.

Will fix.

Regards,
Simon