Re: [PATCH v2 2/2] PCI: xilinx-xdma: Add Xilinx QDMA Root Port driver

Bjorn Helgaas
2024-07-22T22:15:55Z

On Mon, Jul 22, 2024 at 11:55:58AM +0530, Thippeswamy Havalige wrote:
> Add support for Xilinx QDMA Soft IP core as Root Port.
>
> The versal prime devices support QDMA soft IP module in
> programmable logic.

Capitalize brand names.

> The integrated QDMA Soft IP block has integrated bridge function that
> can act as PCIe Root Port.

Rewrap to fill 75 columns.

> +#define QDMA_BRIDGE_BASE_OFF 0xCD8

Other #defines in this file user lower-case hex; please match them.

> static inline u32 pcie_read(struct pl_dma_pcie *port, u32 reg)
> {
> - return readl(port->reg_base + reg);
> + if (port->variant->version == XDMA)
> + return readl(port->reg_base + reg);
> + else
> + return readl(port->reg_base + reg + QDMA_BRIDGE_BASE_OFF);
> }
>
> static inline void pcie_write(struct pl_dma_pcie *port, u32 val, u32 reg)
> {
> - writel(val, port->reg_base + reg);
> + if (port->variant->version == XDMA)
> + writel(val, port->reg_base + reg);
> + else
> + writel(val, port->reg_base + reg + QDMA_BRIDGE_BASE_OFF);
> }
>
> static inline bool xilinx_pl_dma_pcie_link_up(struct pl_dma_pcie *port)
> @@ -173,7 +198,10 @@ static void __iomem *xilinx_pl_dma_pcie_map_bus(struct pci_bus *bus,
> if (!xilinx_pl_dma_pcie_valid_device(bus, devfn))
> return NULL;
>
> - return port->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
> + if (port->variant->version == XDMA)
> + return port->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
> + else
> + return port->cfg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);

If you rework the variant tests above to use
"if (port->variant->version == QDMA)" instead, they will match the one
below, and you won't need to touch the existing code at all, e.g.,

+ if (port->variant->version == QDMA)
+ return port->cfg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);

return port->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);

> }
>
> /* PCIe operations */
> @@ -731,6 +759,15 @@ static int xilinx_pl_dma_pcie_parse_dt(struct pl_dma_pcie *port,
>
> port->reg_base = port->cfg->win;
>
> + if (port->variant->version == QDMA) {
> + port->cfg_base = port->cfg->win;
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg");
> + port->reg_base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(port->reg_base))
> + return PTR_ERR(port->reg_base);
> + port->phys_reg_base = res->start;
> + }