[PATCH] PCI: rcar-gen4: Add vendor-specific registers' setting for MSI-X

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>]

This controller with GICv3 ITS can handle MSI-X, but it needs
to set vendor-specific registers by using the MSI address value.
To get the address, add .post_init() for it.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/pci/controller/dwc/pcie-rcar-gen4.c | 27 +++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index e9166619b1f9..2ed62ffbde38 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -42,6 +42,13 @@
 #define APP_HOLD_PHY_RST	BIT(16)
 #define APP_LTSSM_ENABLE	BIT(0)
 
+/* INTC address */
+#define AXIINTCADDR		0x0a00
+
+/* INTC control & mask */
+#define AXIINTCCONT		0x0a04
+#define AXIINTCCONT_VAL		(BIT(31) | GENMASK(11, 2))
+
 #define RCAR_NUM_SPEED_CHANGE_RETRIES	10
 #define RCAR_MAX_LINK_SPEED		4
 
@@ -297,6 +304,25 @@ static int rcar_gen4_pcie_host_init(struct dw_pcie_rp *pp)
 	return 0;
 }
 
+static void rcar_gen4_pcie_host_post_init(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *dw = to_dw_pcie_from_pp(pp);
+	struct rcar_gen4_pcie *rcar = to_rcar_gen4_pcie(dw);
+	struct irq_data *data;
+	struct pci_dev *dev;
+	struct msi_msg msg;
+
+	if (pp->has_msi_ctrl)
+		return;
+
+	list_for_each_entry(dev, &pp->bridge->bus->devices, bus_list) {
+		data = irq_get_irq_data(dev->irq);
+		__pci_read_msi_msg(irq_data_get_msi_desc(data), &msg);
+		writel(msg.address_lo, rcar->base + AXIINTCADDR);
+		writel(AXIINTCCONT_VAL, rcar->base + AXIINTCCONT);
+	}
+}
+
 static void rcar_gen4_pcie_host_deinit(struct dw_pcie_rp *pp)
 {
 	struct dw_pcie *dw = to_dw_pcie_from_pp(pp);
@@ -308,6 +334,7 @@ static void rcar_gen4_pcie_host_deinit(struct dw_pcie_rp *pp)
 
 static const struct dw_pcie_host_ops rcar_gen4_pcie_host_ops = {
 	.init = rcar_gen4_pcie_host_init,
+	.post_init = rcar_gen4_pcie_host_post_init,
 	.deinit = rcar_gen4_pcie_host_deinit,
 };
 
-- 
2.25.1