PCI: host-common: Convert to library for host controller drivers

This common library will be used as a placeholder for helper functions
shared by the host controller drivers. This avoids placing the host
controller drivers specific helpers in drivers/pci/*.c, to avoid enlarging
the kernel image on platforms that do not use host controller drivers at
all (like x86/ACPI platforms).

Suggested-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250508-pcie-reset-slot-v4-3-7050093e2b50@linaro.org

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 9800b768105402d6dd1ba4b134c2ec23da6e4201..9bb8bf669a807272777b6168d042f8fd7490aeec 100644 (file)
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -3,6 +3,10 @@
 menu "PCI controller drivers"
        depends on PCI
 
+config PCI_HOST_COMMON
+       tristate
+       select PCI_ECAM
+
 config PCI_AARDVARK
        tristate "Aardvark PCIe controller"
        depends on (ARCH_MVEBU && ARM64) || COMPILE_TEST
@@ -119,10 +123,6 @@ config PCI_FTPCI100
        depends on OF
        default ARCH_GEMINI
 
-config PCI_HOST_COMMON
-       tristate
-       select PCI_ECAM
-
 config PCI_HOST_GENERIC
        tristate "Generic PCI host controller"
        depends on OF

diff --git a/drivers/pci/controller/dwc/pcie-hisi.c b/drivers/pci/controller/dwc/pcie-hisi.c
index 8904b5b85ee589576afcb6c81bb4bd39ff960c15..3c17897e56fcb60ec08cf522ee1485f90a2f36a3 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-hisi.c
+++ b/drivers/pci/controller/dwc/pcie-hisi.c
@@ -15,6 +15,7 @@
 #include <linux/pci-acpi.h>
 #include <linux/pci-ecam.h>
 #include "../../pci.h"
+#include "../pci-host-common.h"
 
 #if defined(CONFIG_PCI_HISI) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))
 

diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
index f441bfd6f96a8bde1c07fcf97d43d0693c424a27..f93bc7034e697250711833a5151f7ef177cd62a0 100644 (file)
--- a/drivers/pci/controller/pci-host-common.c
+++ b/drivers/pci/controller/pci-host-common.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
- * Generic PCI host driver common code
+ * Common library for PCI host controller drivers
  *
  * Copyright (C) 2014 ARM Limited
  *
@@ -15,6 +15,8 @@
 #include <linux/pci-ecam.h>
 #include <linux/platform_device.h>
 
+#include "pci-host-common.h"
+
 static void gen_pci_unmap_cfg(void *ptr)
 {
        pci_ecam_free((struct pci_config_window *)ptr);
@@ -94,5 +96,5 @@ void pci_host_common_remove(struct platform_device *pdev)
 }
 EXPORT_SYMBOL_GPL(pci_host_common_remove);
 
-MODULE_DESCRIPTION("Generic PCI host common driver");
+MODULE_DESCRIPTION("Common library for PCI host controller drivers");
 MODULE_LICENSE("GPL v2");

diff --git a/drivers/pci/controller/pci-host-common.h b/drivers/pci/controller/pci-host-common.h
new file mode 100644 (file)
index 0000000..d8be024
--- /dev/null
+++ b/drivers/pci/controller/pci-host-common.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common library for PCI host controller drivers
+ *
+ * Copyright (C) 2014 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#ifndef _PCI_HOST_COMMON_H
+#define _PCI_HOST_COMMON_H
+
+int pci_host_common_probe(struct platform_device *pdev);
+void pci_host_common_remove(struct platform_device *pdev);
+
+#endif

diff --git a/drivers/pci/controller/pci-host-generic.c b/drivers/pci/controller/pci-host-generic.c
index 4051b9b61dace669422e5a6453cc9f58a081beb5..c1bc0d34348f44c9fdd549811f637fb50fe89c64 100644 (file)
--- a/drivers/pci/controller/pci-host-generic.c
+++ b/drivers/pci/controller/pci-host-generic.c
@@ -14,6 +14,8 @@
 #include <linux/pci-ecam.h>
 #include <linux/platform_device.h>
 
+#include "pci-host-common.h"
+
 static const struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = {
        .bus_shift      = 16,
        .pci_ops        = {

diff --git a/drivers/pci/controller/pci-thunder-ecam.c b/drivers/pci/controller/pci-thunder-ecam.c
index 08161065a89c35a95714df935ef437dfc8845697..b5b4a958e6a22b21501cad45bb242a95a784efc1 100644 (file)
--- a/drivers/pci/controller/pci-thunder-ecam.c
+++ b/drivers/pci/controller/pci-thunder-ecam.c
@@ -11,6 +11,8 @@
 #include <linux/pci-ecam.h>
 #include <linux/platform_device.h>
 
+#include "pci-host-common.h"
+
 #if defined(CONFIG_PCI_HOST_THUNDER_ECAM) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))
 
 static void set_val(u32 v, int where, int size, u32 *val)

diff --git a/drivers/pci/controller/pci-thunder-pem.c b/drivers/pci/controller/pci-thunder-pem.c
index f1bd5de67997cddac173723bc7f4ec20aaf20064..5fa037fb61dc356f3029d1b5cae632ae1da5bb9b 100644 (file)
--- a/drivers/pci/controller/pci-thunder-pem.c
+++ b/drivers/pci/controller/pci-thunder-pem.c
@@ -14,6 +14,7 @@
 #include <linux/platform_device.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include "../pci.h"
+#include "pci-host-common.h"
 
 #if defined(CONFIG_PCI_HOST_THUNDER_PEM) || (defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS))
 

diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
index 18e11b9a7f46479348815c3f706319189e0a80b5..edd4c8c683c6a693401b47f5f056641c13ae89f8 100644 (file)
--- a/drivers/pci/controller/pcie-apple.c
+++ b/drivers/pci/controller/pcie-apple.c
@@ -29,6 +29,8 @@
 #include <linux/of_irq.h>
 #include <linux/pci-ecam.h>
 
+#include "pci-host-common.h"
+
 #define CORE_RC_PHYIF_CTL              0x00024
 #define   CORE_RC_PHYIF_CTL_RUN                BIT(0)
 #define CORE_RC_PHYIF_STAT             0x00028

diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
index 3fdfffdf027001bf88df8e1c2538587298228220..24bbf93b8051fa0d9027ce6983eae34cad81065e 100644 (file)
--- a/drivers/pci/controller/plda/pcie-microchip-host.c
+++ b/drivers/pci/controller/plda/pcie-microchip-host.c
@@ -23,6 +23,7 @@
 #include <linux/wordpart.h>
 
 #include "../../pci.h"
+#include "../pci-host-common.h"
 #include "pcie-plda.h"
 
 #define MC_MAX_NUM_INBOUND_WINDOWS             8

diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 3a10f8cfc3ad5c90585a8fc971be714011ed18fe..d930651473b4d0b406e657a24ede87e09517d091 100644 (file)
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -93,10 +93,4 @@ extern const struct pci_ecam_ops al_pcie_ops;        /* Amazon Annapurna Labs PCIe */
 extern const struct pci_ecam_ops tegra194_pcie_ops; /* Tegra194 PCIe */
 extern const struct pci_ecam_ops loongson_pci_ecam_ops; /* Loongson PCIe */
 #endif
-
-#if IS_ENABLED(CONFIG_PCI_HOST_COMMON)
-/* for DT-based PCI controllers that support ECAM */
-int pci_host_common_probe(struct platform_device *pdev);
-void pci_host_common_remove(struct platform_device *pdev);
-#endif
 #endif