Re: [PATCH v4 08/14] xen/arm: Add support for Xilinx ZynqMP PCI host controller

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 4 Oct 2021, Rahul Singh wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> 
> Add support for Xilinx ZynqMP PCI host controller to map the PCI config
> space to the XEN memory.
> 
> Patch helps to understand how the generic infrastructure for PCI
> host-bridge discovery will be used for future references.
> 
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
> Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
> Change in v4:
> - Add __initconstrel and __init for struct and functions
> - Added Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
> Change in v3:
> - nwl_cfg_reg_index(..) as static function
> - Add support for pci_host_generic_probe()
> Change in v2:
> - Add more info in commit msg
> ---
> ---
>  xen/arch/arm/pci/Makefile          |  1 +
>  xen/arch/arm/pci/pci-host-zynqmp.c | 65 ++++++++++++++++++++++++++++++
>  2 files changed, 66 insertions(+)
>  create mode 100644 xen/arch/arm/pci/pci-host-zynqmp.c
> 
> diff --git a/xen/arch/arm/pci/Makefile b/xen/arch/arm/pci/Makefile
> index 6f32fbbe67..1d045ade01 100644
> --- a/xen/arch/arm/pci/Makefile
> +++ b/xen/arch/arm/pci/Makefile
> @@ -3,3 +3,4 @@ obj-y += pci-access.o
>  obj-y += pci-host-generic.o
>  obj-y += pci-host-common.o
>  obj-y += ecam.o
> +obj-y += pci-host-zynqmp.o
> diff --git a/xen/arch/arm/pci/pci-host-zynqmp.c 
> b/xen/arch/arm/pci/pci-host-zynqmp.c
> new file mode 100644
> index 0000000000..61a9807d3d
> --- /dev/null
> +++ b/xen/arch/arm/pci/pci-host-zynqmp.c
> @@ -0,0 +1,65 @@
> +/*
> + * Based on Linux drivers/pci/controller/pci-host-common.c
> + * Based on Linux drivers/pci/controller/pci-host-generic.c
> + * Based on xen/arch/arm/pci/pci-host-generic.c
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <xen/init.h>
> +#include <xen/pci.h>
> +#include <asm/device.h>
> +#include <asm/pci.h>
> +
> +static int __init nwl_cfg_reg_index(struct dt_device_node *np)
> +{
> +    return dt_property_match_string(np, "reg-names", "cfg");
> +}
> +
> +/* ECAM ops */
> +const struct pci_ecam_ops nwl_pcie_ops = {
> +    .bus_shift  = 20,
> +    .cfg_reg_index = nwl_cfg_reg_index,
> +    .pci_ops    = {
> +        .map_bus                = pci_ecam_map_bus,
> +        .read                   = pci_generic_config_read,
> +        .write                  = pci_generic_config_write,
> +    }
> +};
> +
> +static const struct dt_device_match __initconstrel nwl_pcie_dt_match[] =
> +{
> +    { .compatible = "xlnx,nwl-pcie-2.11" },
> +    { },
> +};
> +
> +static int __init pci_host_generic_probe(struct dt_device_node *dev,
> +                                         const void *data)
> +{
> +    return pci_host_common_probe(dev, &nwl_pcie_ops);
> +}
> +
> +DT_DEVICE_START(pci_gen, "PCI HOST ZYNQMP", DEVICE_PCI)
> +.dt_match = nwl_pcie_dt_match,
> +.init = pci_host_generic_probe,
> +DT_DEVICE_END
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
> -- 
> 2.25.1
>