[PATCH v1 6/9] PCI: PLDA: Add host conroller platform driver
Minda Chen
minda.chen at starfivetech.com
Wed Jul 19 03:20:54 PDT 2023
Add PLDA XpressRICH PCIe host controller IP platform
driver. Implement it like DesignWare PCIe platform
driver.
Signed-off-by: Minda Chen <minda.chen at starfivetech.com>
---
drivers/pci/controller/plda/Kconfig | 8 ++
drivers/pci/controller/plda/Makefile | 1 +
drivers/pci/controller/plda/pcie-plda-host.c | 111 +++++++++++++++++++
drivers/pci/controller/plda/pcie-plda-plat.c | 64 +++++++++++
drivers/pci/controller/plda/pcie-plda.h | 3 +
5 files changed, 187 insertions(+)
create mode 100644 drivers/pci/controller/plda/pcie-plda-plat.c
diff --git a/drivers/pci/controller/plda/Kconfig b/drivers/pci/controller/plda/Kconfig
index fb274976b84b..a3c790545843 100644
--- a/drivers/pci/controller/plda/Kconfig
+++ b/drivers/pci/controller/plda/Kconfig
@@ -8,6 +8,14 @@ config PCIE_PLDA_HOST
depends on OF && PCI_MSI
select IRQ_DOMAIN
+config PCIE_PLDA_PLAT_HOST
+ bool "PLDA PCIe platform host controller"
+ select PCIE_PLDA_HOST
+ help
+ Say Y here if you want to support the PLDA PCIe platform controller in
+ host mode. This PCIe controller may be embedded into many different
+ vendors SoCs.
+
config PCIE_MICROCHIP_HOST
bool "Microchip AXI PCIe controller"
select PCI_HOST_COMMON
diff --git a/drivers/pci/controller/plda/Makefile b/drivers/pci/controller/plda/Makefile
index 4340ab007f44..2f16d9126535 100644
--- a/drivers/pci/controller/plda/Makefile
+++ b/drivers/pci/controller/plda/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_PCIE_PLDA_HOST) += pcie-plda-host.o
+obj-$(CONFIG_PCIE_PLDA_PLAT_HOST) += pcie-plda-plat.o
obj-$(CONFIG_PCIE_MICROCHIP_HOST) += pcie-microchip-host.o
diff --git a/drivers/pci/controller/plda/pcie-plda-host.c b/drivers/pci/controller/plda/pcie-plda-host.c
index ca720430721c..e4baa63f6a5b 100644
--- a/drivers/pci/controller/plda/pcie-plda-host.c
+++ b/drivers/pci/controller/plda/pcie-plda-host.c
@@ -20,6 +20,15 @@
#include "pcie-plda.h"
+void __iomem *plda_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
+ int where)
+{
+ struct plda_pcie *pcie = bus->sysdata;
+
+ return pcie->config_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
+}
+EXPORT_SYMBOL_GPL(plda_pcie_map_bus);
+
void plda_pcie_enable_msi(struct plda_pcie *port)
{
struct plda_msi *msi = &port->msi;
@@ -552,3 +561,105 @@ int plda_pcie_setup_iomems(struct plda_pcie *port, struct pci_host_bridge *bridg
return 0;
}
EXPORT_SYMBOL_GPL(plda_pcie_setup_iomems);
+
+static void plda_pcie_irq_domain_deinit(struct plda_pcie *pcie)
+{
+ irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
+ irq_set_chained_handler_and_data(pcie->msi_irq, NULL, NULL);
+ irq_set_chained_handler_and_data(pcie->intx_irq, NULL, NULL);
+
+ irq_domain_remove(pcie->msi.msi_domain);
+ irq_domain_remove(pcie->msi.dev_domain);
+
+ irq_domain_remove(pcie->intx_domain);
+ irq_domain_remove(pcie->event_domain);
+}
+
+int plda_pcie_host_init(struct plda_pcie *pcie, struct pci_ops *ops)
+{
+ struct resource *cfg_res;
+ struct device *dev = pcie->dev;
+ int ret;
+ struct pci_host_bridge *bridge;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct plda_evt evt = {NULL, NULL, EVENT_PM_MSI_INT_INTX,
+ EVENT_PM_MSI_INT_MSI};
+
+ pcie->bridge_addr =
+ devm_platform_ioremap_resource_byname(pdev, "host");
+
+ if (IS_ERR(pcie->bridge_addr))
+ return dev_err_probe(dev, PTR_ERR(pcie->bridge_addr),
+ "Failed to map reg memory\n");
+
+ cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+ if (!cfg_res)
+ return dev_err_probe(dev, -ENODEV,
+ "Failed to get config memory\n");
+
+ pcie->config_base = devm_ioremap_resource(dev, cfg_res);
+ if (IS_ERR(pcie->config_base))
+ return dev_err_probe(dev, PTR_ERR(pcie->config_base),
+ "Failed to map config memory\n");
+
+ pcie->phy = devm_phy_optional_get(dev, NULL);
+ if (IS_ERR(pcie->phy))
+ return dev_err_probe(dev, PTR_ERR(pcie->phy),
+ "Failed to get pcie phy\n");
+
+ bridge = devm_pci_alloc_host_bridge(dev, 0);
+ if (!bridge)
+ return dev_err_probe(dev, -ENOMEM,
+ "Failed to alloc bridge\n");
+
+ pcie->bridge = bridge;
+
+ if (pcie->ops->host_init) {
+ ret = pcie->ops->host_init(pcie);
+ if (ret)
+ return ret;
+ }
+
+ plda_pcie_setup_window(pcie->bridge_addr, 0, cfg_res->start, 0,
+ resource_size(cfg_res));
+ plda_pcie_setup_iomems(pcie, bridge);
+ plda_set_default_msi(&pcie->msi);
+ ret = plda_pcie_init_irq(pcie, pdev, &evt);
+ if (ret)
+ goto err_host;
+
+ /* Set default bus ops */
+ bridge->ops = ops;
+ bridge->sysdata = pcie;
+
+ plda_pcie_enable_msi(pcie);
+
+ ret = pci_host_probe(bridge);
+ if (ret < 0) {
+ dev_err(dev, "Failed to pci host probe: %d\n", ret);
+ goto err_probe;
+ }
+
+ return ret;
+
+err_probe:
+ plda_pcie_irq_domain_deinit(pcie);
+err_host:
+ if (pcie->ops->host_deinit)
+ pcie->ops->host_deinit(pcie);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(plda_pcie_host_init);
+
+void plda_pcie_host_deinit(struct plda_pcie *pcie)
+{
+ pci_stop_root_bus(pcie->bridge->bus);
+ pci_remove_root_bus(pcie->bridge->bus);
+
+ plda_pcie_irq_domain_deinit(pcie);
+
+ if (pcie->ops->host_deinit)
+ pcie->ops->host_deinit(pcie);
+}
+EXPORT_SYMBOL_GPL(plda_pcie_host_deinit);
diff --git a/drivers/pci/controller/plda/pcie-plda-plat.c b/drivers/pci/controller/plda/pcie-plda-plat.c
new file mode 100644
index 000000000000..270aceb57c7a
--- /dev/null
+++ b/drivers/pci/controller/plda/pcie-plda-plat.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PLDA XpressRich PCIe platform driver
+ *
+ * Authors: Minda Chen <minda.chen at starfivetech.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of_device.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+#include <linux/types.h>
+
+#include "pcie-plda.h"
+
+static struct pci_ops plda_default_ops = {
+ .map_bus = plda_pcie_map_bus,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
+};
+
+static int plda_plat_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct plda_pcie *pci;
+ int ret;
+
+ pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
+ if (!pci)
+ return -ENOMEM;
+
+ pci->dev = dev;
+
+ ret = plda_pcie_host_init(pci, &plda_default_ops);
+ if (ret) {
+ dev_err(dev, "Failed to initialize host\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, pci);
+
+ return ret;
+}
+
+static const struct of_device_id plda_plat_pcie_of_match[] = {
+ { .compatible = "plda,xpressrich-pcie-host"},
+ { /* sentinel */ }
+};
+
+static struct platform_driver plda_plat_pcie_driver = {
+ .driver = {
+ .name = "plda-xpressrich-pcie",
+ .of_match_table = plda_plat_pcie_of_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = plda_plat_pcie_probe,
+};
+builtin_platform_driver(plda_plat_pcie_driver);
diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
index feb3a0d9ace5..8785f885ddb1 100644
--- a/drivers/pci/controller/plda/pcie-plda.h
+++ b/drivers/pci/controller/plda/pcie-plda.h
@@ -157,6 +157,7 @@ struct plda_evt {
int msi_evt;
};
+void __iomem *plda_pcie_map_bus(struct pci_bus *bus, unsigned int devfn, int where);
void plda_pcie_enable_msi(struct plda_pcie *port);
void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
phys_addr_t axi_addr, phys_addr_t pci_addr,
@@ -164,6 +165,8 @@ void plda_pcie_setup_window(void __iomem *bridge_base_addr, u32 index,
int plda_pcie_setup_iomems(struct plda_pcie *port, struct pci_host_bridge *host_bridge);
int plda_pcie_init_irq(struct plda_pcie *port, struct platform_device *pdev,
struct plda_evt *evt);
+int plda_pcie_host_init(struct plda_pcie *pcie, struct pci_ops *ops);
+void plda_pcie_host_deinit(struct plda_pcie *pcie);
static inline void plda_set_default_msi(struct plda_msi *msi)
{
--
2.17.1
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