linux-kernel - Re: [PATCH v7 6/8] PCI: rcar: Add support for R-Car PCIe controller in endpoint mode

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Date:   Wed, 8 Apr 2020 18:51:33 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Kishon Vijay Abraham I <kishon@...com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Tom Joseph <tjoseph@...ence.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        linux-rockchip@...ts.infradead.org,
        Lad Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v7 6/8] PCI: rcar: Add support for R-Car PCIe controller
 in endpoint mode

Maybe:

  PCI: rcar: Add endpoint mode support

so the important "endpoint mode" part is early and doesn't get chopped
off or wrapped.  We already know it's PCIe and rcar-related.

On Wed, Apr 08, 2020 at 04:37:58PM +0100, Lad Prabhakar wrote:
> This patch adds support for R-Car PCIe controller to work in endpoint mode.

s/This patch adds/Add/

> +static int rcar_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no,
> +				struct pci_epf_bar *epf_bar)
> +{
> +	int flags = epf_bar->flags | LAR_ENABLE | LAM_64BIT;
> +	struct rcar_pcie_endpoint *ep = epc_get_drvdata(epc);
> +	u64 size = 1ULL << fls64(epf_bar->size - 1);
> +	dma_addr_t cpu_addr = epf_bar->phys_addr;
> +	enum pci_barno bar = epf_bar->barno;
> +	struct rcar_pcie *pcie = &ep->pcie;
> +	u32 mask;
> +	int idx;
> +	int err;
> +
> +	idx = find_first_zero_bit(ep->ib_window_map, ep->num_ib_windows);
> +	if (idx >= ep->num_ib_windows) {
> +		dev_err(pcie->dev, "no free inbound window\n");
> +		return -EINVAL;
> +	}
> +
> +	if ((flags & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO)
> +		flags |= IO_SPACE;
> +
> +	ep->bar_to_atu[bar] = idx;
> +	/* use 64 bit bars */

s/64 bit bars/64-bit BARs/

> +static const struct pci_epc_features rcar_pcie_epc_features = {
> +	.linkup_notifier = false,
> +	.msi_capable = true,
> +	.msix_capable = false,
> +	/* use 64-bit bars so mark bar1/3/5 as reserved */

s/bar/BAR/g