intel64: register PCI controller early but postpone PCI drivers init

Some of PCI drivers require OS interfaces that can't be executed in the INIT context.
In that case we have to postpone PCI drivers probing and call it for example
in board initialization logic.

Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>

arch/Kconfig

@@ -138,6 +138,7 @@ config ARCH_X86_64
 	select ARCH_HAVE_TESTSET
 	select ARCH_HAVE_INTERRUPTSTACK
 	select ARCH_HAVE_CUSTOMOPT
+	select PCI_LATE_DRIVERS_REGISTER if PCI
 	select LIBC_ARCH_ELF_64BIT if LIBC_ARCH_ELF
 	select ARCH_TOOLCHAIN_GNU
 	---help---

arch/x86_64/src/common/x86_64_initialize.c

@@ -145,6 +145,12 @@ void up_initialize(void)
   x86_64_netinitialize();
 #endif
 
+  /* Initialize the PCI bus */
+
+#ifdef CONFIG_PCI
+  x86_64_pci_init();
+#endif
+
   /* Initialize USB -- device and/or host */
 
   x86_64_usbinitialize();

boards/x86_64/intel64/qemu-intel64/src/qemu_bringup.c

@@ -36,7 +36,10 @@
 #  include <nuttx/timers/oneshot.h>
 #endif
 
-#include "x86_64_internal.h"
+#ifdef CONFIG_PCI
+#  include <nuttx/pci/pci.h>
+#endif
+
 #include "qemu_intel64.h"
 
 /****************************************************************************
@@ -68,10 +71,10 @@ int qemu_bringup(void)
 
   int ret = OK;
 
-  /* Initialize the PCI bus */
-
 #ifdef CONFIG_PCI
-  x86_64_pci_init();
+  /* Register the PCI bus drivers */
+
+  pci_register_drivers();
 #endif
 
 #ifdef CONFIG_FS_PROCFS

drivers/drivers_initialize.c

@@ -254,7 +254,7 @@ void drivers_initialize(void)
   mtd_loop_register();
 #endif
 
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) && !defined(CONFIG_PCI_LATE_DRIVERS_REGISTER)
   pci_register_drivers();
 #endif
 

drivers/pci/Kconfig

@@ -12,6 +12,14 @@ menuconfig PCI
 
 if PCI
 
+config PCI_LATE_DRIVERS_REGISTER
+	bool
+	default n
+	---help---
+		This option disables PCI driver registration in drivers_initialize().
+		Care must be taken to call pci_register_drivers() in later code, most likely
+		as board specific code.
+
 config PCI_MSIX
 	bool "PCI MSI-X support"
 	default n