Merge branch 'remotes/lorenzo/pci/altera'

  - Allow building Altera host bridge driver as a module (Ley Foon Tan)

  - Fix Altera Stratix 10 Type 1 to Type 0 config access conversion (Ley
    Foon Tan)

* remotes/lorenzo/pci/altera:
  PCI: altera: Fix configuration type based on secondary number
  PCI: altera-msi: Allow building as module
  PCI: altera: Allow building as module

3 files changed, 65 insertions, 18 deletions

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 011c57cae4b0..fe9f9f13ce11 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -174,14 +174,14 @@ config PCIE_IPROC_MSI
 	  PCIe controller
 
 config PCIE_ALTERA
-	bool "Altera PCIe controller"
+	tristate "Altera PCIe controller"
 	depends on ARM || NIOS2 || ARM64 || COMPILE_TEST
 	help
 	  Say Y here if you want to enable PCIe controller support on Altera
 	  FPGA.
 
 config PCIE_ALTERA_MSI
-	bool "Altera PCIe MSI feature"
+	tristate "Altera PCIe MSI feature"
 	depends on PCIE_ALTERA
 	depends on PCI_MSI_IRQ_DOMAIN
 	help
diff --git a/drivers/pci/controller/pcie-altera-msi.c b/drivers/pci/controller/pcie-altera-msi.c
index 025ef7d9a046..16d938920ca5 100644
--- a/drivers/pci/controller/pcie-altera-msi.c
+++ b/drivers/pci/controller/pcie-altera-msi.c
@@ -10,6 +10,7 @@
 #include <linux/interrupt.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/init.h>
+#include <linux/module.h>
 #include <linux/msi.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -288,4 +289,13 @@ static int __init altera_msi_init(void)
 {
 	return platform_driver_register(&altera_msi_driver);
 }
+
+static void __exit altera_msi_exit(void)
+{
+	platform_driver_unregister(&altera_msi_driver);
+}
+
 subsys_initcall(altera_msi_init);
+MODULE_DEVICE_TABLE(of, altera_msi_of_match);
+module_exit(altera_msi_exit);
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
index 27edcebd1726..d2497ca43828 100644
--- a/drivers/pci/controller/pcie-altera.c
+++ b/drivers/pci/controller/pcie-altera.c
@@ -10,6 +10,7 @@
 #include <linux/interrupt.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/init.h>
+#include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
@@ -43,6 +44,8 @@
 #define S10_RP_RXCPL_STATUS		0x200C
 #define S10_RP_CFG_ADDR(pcie, reg)	\
 	(((pcie)->hip_base) + (reg) + (1 << 20))
+#define S10_RP_SECONDARY(pcie)		\
+	readb(S10_RP_CFG_ADDR(pcie, PCI_SECONDARY_BUS))
 
 /* TLP configuration type 0 and 1 */
 #define TLP_FMTTYPE_CFGRD0		0x04	/* Configuration Read Type 0 */
@@ -54,14 +57,9 @@
 #define TLP_WRITE_TAG			0x10
 #define RP_DEVFN			0
 #define TLP_REQ_ID(bus, devfn)		(((bus) << 8) | (devfn))
-#define TLP_CFGRD_DW0(pcie, bus)					\
-	((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgrd0		\
-				: pcie->pcie_data->cfgrd1) << 24) |	\
-				TLP_PAYLOAD_SIZE)
-#define TLP_CFGWR_DW0(pcie, bus)					\
-	((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgwr0		\
-				: pcie->pcie_data->cfgwr1) << 24) |	\
-				TLP_PAYLOAD_SIZE)
+#define TLP_CFG_DW0(pcie, cfg)		\
+		(((cfg) << 24) |	\
+		  TLP_PAYLOAD_SIZE)
 #define TLP_CFG_DW1(pcie, tag, be)	\
 	(((TLP_REQ_ID(pcie->root_bus_nr,  RP_DEVFN)) << 16) | (tag << 8) | (be))
 #define TLP_CFG_DW2(bus, devfn, offset)	\
@@ -321,14 +319,31 @@ static void s10_tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
 	s10_tlp_write_tx(pcie, data, RP_TX_EOP);
 }
 
+static void get_tlp_header(struct altera_pcie *pcie, u8 bus, u32 devfn,
+			   int where, u8 byte_en, bool read, u32 *headers)
+{
+	u8 cfg;
+	u8 cfg0 = read ? pcie->pcie_data->cfgrd0 : pcie->pcie_data->cfgwr0;
+	u8 cfg1 = read ? pcie->pcie_data->cfgrd1 : pcie->pcie_data->cfgwr1;
+	u8 tag = read ? TLP_READ_TAG : TLP_WRITE_TAG;
+
+	if (pcie->pcie_data->version == ALTERA_PCIE_V1)
+		cfg = (bus == pcie->root_bus_nr) ? cfg0 : cfg1;
+	else
+		cfg = (bus > S10_RP_SECONDARY(pcie)) ? cfg0 : cfg1;
+
+	headers[0] = TLP_CFG_DW0(pcie, cfg);
+	headers[1] = TLP_CFG_DW1(pcie, tag, byte_en);
+	headers[2] = TLP_CFG_DW2(bus, devfn, where);
+}
+
 static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
 			      int where, u8 byte_en, u32 *value)
 {
 	u32 headers[TLP_HDR_SIZE];
 
-	headers[0] = TLP_CFGRD_DW0(pcie, bus);
-	headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en);
-	headers[2] = TLP_CFG_DW2(bus, devfn, where);
+	get_tlp_header(pcie, bus, devfn, where, byte_en, true,
+		       headers);
 
 	pcie->pcie_data->ops->tlp_write_pkt(pcie, headers, 0, false);
 
@@ -341,9 +356,8 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
 	u32 headers[TLP_HDR_SIZE];
 	int ret;
 
-	headers[0] = TLP_CFGWR_DW0(pcie, bus);
-	headers[1] = TLP_CFG_DW1(pcie, TLP_WRITE_TAG, byte_en);
-	headers[2] = TLP_CFG_DW2(bus, devfn, where);
+	get_tlp_header(pcie, bus, devfn, where, byte_en, false,
+		       headers);
 
 	/* check alignment to Qword */
 	if ((where & 0x7) == 0)
@@ -705,6 +719,13 @@ static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
 	return 0;
 }
 
+static void altera_pcie_irq_teardown(struct altera_pcie *pcie)
+{
+	irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
+	irq_domain_remove(pcie->irq_domain);
+	irq_dispose_mapping(pcie->irq);
+}
+
 static int altera_pcie_parse_dt(struct altera_pcie *pcie)
 {
 	struct device *dev = &pcie->pdev->dev;
@@ -798,6 +819,7 @@ static int altera_pcie_probe(struct platform_device *pdev)
 
 	pcie = pci_host_bridge_priv(bridge);
 	pcie->pdev = pdev;
+	platform_set_drvdata(pdev, pcie);
 
 	match = of_match_device(altera_pcie_of_match, &pdev->dev);
 	if (!match)
@@ -855,13 +877,28 @@ static int altera_pcie_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int altera_pcie_remove(struct platform_device *pdev)
+{
+	struct altera_pcie *pcie = platform_get_drvdata(pdev);
+	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
+
+	pci_stop_root_bus(bridge->bus);
+	pci_remove_root_bus(bridge->bus);
+	pci_free_resource_list(&pcie->resources);
+	altera_pcie_irq_teardown(pcie);
+
+	return 0;
+}
+
 static struct platform_driver altera_pcie_driver = {
 	.probe		= altera_pcie_probe,
+	.remove		= altera_pcie_remove,
 	.driver = {
 		.name	= "altera-pcie",
 		.of_match_table = altera_pcie_of_match,
-		.suppress_bind_attrs = true,
 	},
 };
 
-builtin_platform_driver(altera_pcie_driver);
+MODULE_DEVICE_TABLE(of, altera_pcie_of_match);
+module_platform_driver(altera_pcie_driver);
+MODULE_LICENSE("GPL v2");