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x86: Move pci init function to x86_init

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The PCI initialization in pci_subsys_init() is a mess. pci_numaq_init,
pci_acpi_init, pci_visws_init and pci_legacy_init are called and each
implementation checks and eventually modifies the global variable
pcibios_scanned.

x86_init functions allow us to do this more elegant. The pci.init
function pointer is preset to pci_legacy_init. numaq, acpi and visws
can modify the pointer in their early setup functions. The functions
return 0 when they did the full initialization including bus scan. A
non zero return value indicates that pci_legacy_init needs to be
called either because the selected function failed or wants the
generic bus scan in pci_legacy_init to happen (e.g. visws).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <43F901BD926A4E43B106BF17856F07559FB80CFE@orsmsx508.amr.corp.intel.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Jacob Pan <jacob.jun.pan@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Thomas Gleixner
2009-08-29 16:24:51 +02:00
committed by H. Peter Anvin
parent cf4c43dd43
commit b72d0db9dd
15 changed files with 53 additions and 46 deletions
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22
arch/x86/pci/legacy.c
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@@ -35,16 +35,13 @@ static void __devinit pcibios_fixup_peer_bridges(void)
}
}
static int __init pci_legacy_init(void)
int __init pci_legacy_init(void)
{
if (!raw_pci_ops) {
printk("PCI: System does not support PCI\n");
return 0;
}
if (pcibios_scanned++)
return 0;
printk("PCI: Probing PCI hardware\n");
pci_root_bus = pcibios_scan_root(0);
if (pci_root_bus)
@@ -55,16 +52,13 @@ static int __init pci_legacy_init(void)
int __init pci_subsys_init(void)
{
#ifdef CONFIG_X86_NUMAQ
pci_numaq_init();
#endif
#ifdef CONFIG_ACPI
pci_acpi_init();
#endif
#ifdef CONFIG_X86_VISWS
pci_visws_init();
#endif
pci_legacy_init();
/*
* The init function returns an non zero value when
* pci_legacy_init should be invoked.
*/
if (x86_init.pci.init())
pci_legacy_init();
pcibios_fixup_peer_bridges();
pcibios_irq_init();
pcibios_init();