[PATCH 3/6] PCI: mobiveil: Add PCIe Gen4 EP driver for NXP Layerscape SoCs
From: Xiaowei Bao
Date: Sun Sep 15 2019 - 22:28:47 EST
This PCIe controller is based on the Mobiveil GPEX IP, it work in EP
mode if select this config opteration.
Signed-off-by: Xiaowei Bao <xiaowei.bao@xxxxxxx>
---
MAINTAINERS | 2 +
drivers/pci/controller/mobiveil/Kconfig | 17 ++-
drivers/pci/controller/mobiveil/Makefile | 1 +
.../controller/mobiveil/pcie-layerscape-gen4-ep.c | 156 +++++++++++++++++++++
4 files changed, 173 insertions(+), 3 deletions(-)
create mode 100644 drivers/pci/controller/mobiveil/pcie-layerscape-gen4-ep.c
diff --git a/MAINTAINERS b/MAINTAINERS
index b997056..0858b54 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12363,11 +12363,13 @@ F: drivers/pci/controller/dwc/*layerscape*
PCI DRIVER FOR NXP LAYERSCAPE GEN4 CONTROLLER
M: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
+M: Xiaowei Bao <xiaowei.bao@xxxxxxx>
L: linux-pci@xxxxxxxxxxxxxxx
L: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
S: Maintained
F: Documentation/devicetree/bindings/pci/layerscape-pcie-gen4.txt
F: drivers/pci/controller/mobibeil/pcie-layerscape-gen4.c
+F: drivers/pci/controller/mobiveil/pcie-layerscape-gen4-ep.c
PCI DRIVER FOR GENERIC OF HOSTS
M: Will Deacon <will@xxxxxxxxxx>
diff --git a/drivers/pci/controller/mobiveil/Kconfig b/drivers/pci/controller/mobiveil/Kconfig
index 2054950..0696b6e 100644
--- a/drivers/pci/controller/mobiveil/Kconfig
+++ b/drivers/pci/controller/mobiveil/Kconfig
@@ -27,13 +27,24 @@ config PCIE_MOBIVEIL_PLAT
for address translation and it is a PCIe Gen4 IP.
config PCIE_LAYERSCAPE_GEN4
- bool "Freescale Layerscape PCIe Gen4 controller"
+ bool "Freescale Layerscpe PCIe Gen4 controller in RC mode"
depends on PCI
depends on OF && (ARM64 || ARCH_LAYERSCAPE)
depends on PCI_MSI_IRQ_DOMAIN
select PCIE_MOBIVEIL_HOST
help
Say Y here if you want PCIe Gen4 controller support on
- Layerscape SoCs. The PCIe controller can work in RC or
- EP mode according to RCW[HOST_AGT_PEX] setting.
+ Layerscape SoCs. And the PCIe controller work in RC mode
+ by setting the RCW[HOST_AGT_PEX] to 0.
+
+config PCIE_LAYERSCAPE_GEN4_EP
+ bool "Freescale Layerscpe PCIe Gen4 controller in EP mode"
+ depends on PCI
+ depends on OF && (ARM64 || ARCH_LAYERSCAPE)
+ depends on PCI_ENDPOINT
+ select PCIE_MOBIVEIL_EP
+ help
+ Say Y here if you want PCIe Gen4 controller support on
+ Layerscape SoCs. And the PCIe controller work in EP mode
+ by setting the RCW[HOST_AGT_PEX] to 1.
endmenu
diff --git a/drivers/pci/controller/mobiveil/Makefile b/drivers/pci/controller/mobiveil/Makefile
index 686d41f..6f54856 100644
--- a/drivers/pci/controller/mobiveil/Makefile
+++ b/drivers/pci/controller/mobiveil/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_PCIE_MOBIVEIL_HOST) += pcie-mobiveil-host.o
obj-$(CONFIG_PCIE_MOBIVEIL_EP) += pcie-mobiveil-ep.o
obj-$(CONFIG_PCIE_MOBIVEIL_PLAT) += pcie-mobiveil-plat.o
obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie-layerscape-gen4.o
+obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4_EP) += pcie-layerscape-gen4-ep.o
diff --git a/drivers/pci/controller/mobiveil/pcie-layerscape-gen4-ep.c b/drivers/pci/controller/mobiveil/pcie-layerscape-gen4-ep.c
new file mode 100644
index 0000000..7bfec51
--- /dev/null
+++ b/drivers/pci/controller/mobiveil/pcie-layerscape-gen4-ep.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe controller EP driver for Freescale Layerscape SoCs
+ *
+ * Copyright (C) 2019 NXP Semiconductor.
+ *
+ * Author: Xiaowei Bao <xiaowei.bao@xxxxxxx>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+
+#include "pcie-mobiveil.h"
+
+#define PCIE_LX2_BAR_NUM 4
+
+#define to_ls_pcie_g4_ep(x) dev_get_drvdata((x)->dev)
+
+struct ls_pcie_g4_ep {
+ struct mobiveil_pcie *mv_pci;
+};
+
+static const struct of_device_id ls_pcie_g4_ep_of_match[] = {
+ { .compatible = "fsl,lx2160a-pcie-ep",},
+ { },
+};
+
+static const struct pci_epc_features ls_pcie_g4_epc_features = {
+ .linkup_notifier = false,
+ .msi_capable = true,
+ .msix_capable = true,
+ .reserved_bar = (1 << BAR_4) | (1 << BAR_5),
+};
+
+static const struct pci_epc_features*
+ls_pcie_g4_ep_get_features(struct mobiveil_pcie_ep *ep)
+{
+ return &ls_pcie_g4_epc_features;
+}
+
+static void ls_pcie_g4_ep_init(struct mobiveil_pcie_ep *ep)
+{
+ struct mobiveil_pcie *mv_pci = to_mobiveil_pcie_from_ep(ep);
+ int win_idx;
+ u8 bar;
+
+ ep->bar_num = PCIE_LX2_BAR_NUM;
+
+ for (bar = BAR_0; bar < ep->epc->max_functions * ep->bar_num; bar++)
+ mobiveil_pcie_ep_reset_bar(mv_pci, bar);
+
+ for (win_idx = 0; win_idx < ep->apio_wins; win_idx++)
+ mobiveil_pcie_disable_ob_win(mv_pci, win_idx);
+}
+
+static int ls_pcie_g4_ep_raise_irq(struct mobiveil_pcie_ep *ep, u8 func_no,
+ enum pci_epc_irq_type type,
+ u16 interrupt_num)
+{
+ struct mobiveil_pcie *mv_pci = to_mobiveil_pcie_from_ep(ep);
+
+ switch (type) {
+ case PCI_EPC_IRQ_LEGACY:
+ return mobiveil_pcie_ep_raise_legacy_irq(ep, func_no);
+ case PCI_EPC_IRQ_MSI:
+ return mobiveil_pcie_ep_raise_msi_irq(ep, func_no,
+ interrupt_num);
+ case PCI_EPC_IRQ_MSIX:
+ return mobiveil_pcie_ep_raise_msix_irq(ep, func_no,
+ interrupt_num);
+ default:
+ dev_err(&mv_pci->pdev->dev, "UNKNOWN IRQ type\n");
+ }
+
+ return 0;
+}
+
+static const struct mobiveil_pcie_ep_ops pcie_ep_ops = {
+ .ep_init = ls_pcie_g4_ep_init,
+ .raise_irq = ls_pcie_g4_ep_raise_irq,
+ .get_features = ls_pcie_g4_ep_get_features,
+};
+
+static int __init ls_pcie_gen4_add_pcie_ep(struct ls_pcie_g4_ep *ls_ep,
+ struct platform_device *pdev)
+{
+ struct mobiveil_pcie *mv_pci = ls_ep->mv_pci;
+ struct device *dev = &pdev->dev;
+ struct mobiveil_pcie_ep *ep;
+ struct resource *res;
+ int ret;
+
+ ep = &mv_pci->ep;
+ ep->ops = &pcie_ep_ops;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
+ if (!res)
+ return -EINVAL;
+
+ ep->phys_base = res->start;
+ ep->addr_size = resource_size(res);
+
+ ret = mobiveil_pcie_ep_init(ep);
+ if (ret) {
+ dev_err(dev, "failed to initialize layerscape endpoint\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __init ls_pcie_g4_ep_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mobiveil_pcie *mv_pci;
+ struct ls_pcie_g4_ep *ls_ep;
+ struct resource *res;
+ int ret;
+
+ ls_ep = devm_kzalloc(dev, sizeof(*ls_ep), GFP_KERNEL);
+ if (!ls_ep)
+ return -ENOMEM;
+
+ mv_pci = devm_kzalloc(dev, sizeof(*mv_pci), GFP_KERNEL);
+ if (!mv_pci)
+ return -ENOMEM;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+ mv_pci->csr_axi_slave_base = devm_pci_remap_cfg_resource(dev, res);
+ if (IS_ERR(mv_pci->csr_axi_slave_base))
+ return PTR_ERR(mv_pci->csr_axi_slave_base);
+
+ mv_pci->pdev = pdev;
+ ls_ep->mv_pci = mv_pci;
+
+ platform_set_drvdata(pdev, ls_ep);
+
+ ret = ls_pcie_gen4_add_pcie_ep(ls_ep, pdev);
+
+ return ret;
+}
+
+static struct platform_driver ls_pcie_g4_ep_driver = {
+ .driver = {
+ .name = "layerscape-pcie-gen4-ep",
+ .of_match_table = ls_pcie_g4_ep_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+builtin_platform_driver_probe(ls_pcie_g4_ep_driver, ls_pcie_g4_ep_probe);
--
2.9.5