RE: [PATCH v5 6/7] PCI: rcar: Add support for rcar PCIe controller in endpoint mode

From: Lad Prabhakar, Sent: Saturday, February 29, 2020 12:41 AM

This patch adds support for rcar PCIe controller to work in endpoint mode.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/pci/controller/Kconfig        |   8 +
 drivers/pci/controller/Makefile       |   1 +
 drivers/pci/controller/pcie-rcar-ep.c | 490 ++++++++++++++++++++++++++++++++++
 drivers/pci/controller/pcie-rcar.h    |   4 +
 4 files changed, 503 insertions(+)
 create mode 100644 drivers/pci/controller/pcie-rcar-ep.c

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 37e0ea7..9bf4b02 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig

@@ -62,6 +62,14 @@ config PCIE_RCAR_HOST
 	  Say Y here if you want PCIe controller support on R-Car SoCs in host
 	  mode.

+config PCIE_RCAR_EP
+	bool "Renesas R-Car PCIe endpoint controller"
+	depends on ARCH_RENESAS || COMPILE_TEST
+	depends on PCI_ENDPOINT
+	help
+	  Say Y here if you want PCIe controller support on R-Car SoCs in
+	  endpoint mode.
+
 config PCI_HOST_COMMON
 	bool
 	select PCI_ECAM

diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
index b4ada32..067bd33 100644
--- a/drivers/pci/controller/Makefile
+++ b/drivers/pci/controller/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_PCI_AARDVARK) += pci-aardvark.o
 obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
 obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
 obj-$(CONFIG_PCIE_RCAR_HOST) += pcie-rcar.o pcie-rcar-host.o
+obj-$(CONFIG_PCIE_RCAR_EP) += pcie-rcar.o pcie-rcar-ep.o
 obj-$(CONFIG_PCI_HOST_COMMON) += pci-host-common.o
 obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
 obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o

diff --git a/drivers/pci/controller/pcie-rcar-ep.c b/drivers/pci/controller/pcie-rcar-ep.c
new file mode 100644
index 0000000..db89bbe
--- /dev/null
+++ b/drivers/pci/controller/pcie-rcar-ep.c

@@ -0,0 +1,490 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe endpoint driver for Renesas R-Car SoCs
+ *  Copyright (c) 2020 Renesas Electronics Europe GmbH
+ *
+ * Author: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/pci-epc.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#include "pcie-rcar.h"
+
+/* Structure representing the PCIe interface */
+struct rcar_pcie {
+	phys_addr_t		*ob_addr;

+static int rcar_pcie_ep_start(struct pci_epc *epc)
+{
+	struct rcar_pcie *ep = epc_get_drvdata(epc);
+
+	rcar_pci_write_reg(ep->base, CFINIT, PCIETCTLR);

+
+	return 0;
+}
+
+static void rcar_pcie_ep_stop(struct pci_epc *epc)
+{
+	struct rcar_pcie *ep = epc_get_drvdata(epc);
+
+	rcar_pci_write_reg(ep->base, 0, PCIETCTLR);
+}
+
+static const struct pci_epc_features rcar_pcie_epc_features = {
+	.linkup_notifier = false,
+	.msi_capable = false,
+	.msix_capable = false,
+	/* use 64-bit bars so mark bar1/3/5 as reserved */
+	.reserved_bar = 1 << BAR_1 | 1 << BAR_3 | 1 << BAR_5,
+	.bar_fixed_64bit =  (1 << BAR_0) | (1 << BAR_2) | (1 << BAR_4),

+	err = pci_epc_mem_init(epc, pcie->ob_window, pcie->num_ob_windows);
+	if (err < 0) {
+		dev_err(dev, "failed to initialize the epc memory space\n");
+		goto err_pm_put;
+	}
+
+	rcar_pcie_ep_hw_init(pcie);

+builtin_platform_driver(rcar_pcie_ep_driver);

diff --git a/drivers/pci/controller/pcie-rcar.h b/drivers/pci/controller/pcie-rcar.h
index b529d806..5564ca8 100644
--- a/drivers/pci/controller/pcie-rcar.h
+++ b/drivers/pci/controller/pcie-rcar.h

@@ -17,6 +17,7 @@
 #define PCIECDR			0x000020
 #define PCIEMSR			0x000028
 #define PCIEINTXR		0x000400
+#define  ASTINTX_SHIFT		BIT(16)

 #define PCIEPHYSR		0x0007f0
 #define  PHYRDY			BIT(0)
 #define PCIEMSITXR		0x000840

@@ -55,12 +56,15 @@

 /* Configuration */
 #define PCICONF(x)		(0x010000 + ((x) * 0x4))
+#define  INTDIS_SHIFT		BIT(10)