From: Marek Vasut <marek.vasut+renesas@gmail.com>
Date: Fri, 15 Jan 2021 23:28:18 +0000 (+0100)
Subject: pci: renesas: Add root bus handling on Gen3
X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=b9616d8f903c8f4c7eac78adc7a8ff41c3099be3;p=u-boot.git

pci: renesas: Add root bus handling on Gen3

Add code to access the PCIe root bus space and configure it.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
---

diff --git a/drivers/pci/pci-rcar-gen3.c b/drivers/pci/pci-rcar-gen3.c
index 0d5b01f9f8..cd116a536e 100644
--- a/drivers/pci/pci-rcar-gen3.c
+++ b/drivers/pci/pci-rcar-gen3.c
@@ -151,6 +151,16 @@ static int rcar_pcie_config_access(const struct udevice *udev,
 	struct rcar_gen3_pcie_priv *priv = dev_get_plat(udev);
 	u32 reg = where & ~3;
 
+	/* Root bus */
+	if (PCI_DEV(bdf) == 0) {
+		if (access_type == RCAR_PCI_ACCESS_READ)
+			*data = readl(priv->regs + PCICONF(where / 4));
+		else
+			writel(*data, priv->regs + PCICONF(where / 4));
+
+		return 0;
+	}
+
 	/* Clear errors */
 	clrbits_le32(priv->regs + PCIEERRFR, 0);
 
@@ -187,11 +197,14 @@ static int rcar_gen3_pcie_addr_valid(pci_dev_t d, uint where)
 {
 	u32 slot;
 
+	if (PCI_BUS(d))
+		return -EINVAL;
+
 	if (PCI_FUNC(d))
 		return -EINVAL;
 
 	slot = PCI_DEV(d);
-	if (slot != 1)
+	if (slot > 1)
 		return -EINVAL;
 
 	return 0;