MMCFG can be used perfectly for all architectures which support ACPI.
ACPI mandates MMCFG to describe PCI config space ranges which means
we should use MMCONFIG accessors by default.
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
Tested-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
drivers/acpi/mmconfig.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/acpi/mmconfig.c b/drivers/acpi/mmconfig.c
index c0ad05f..c9c6e05 100644
--- a/drivers/acpi/mmconfig.c
+++ b/drivers/acpi/mmconfig.c
@@ -23,6 +23,26 @@ static DEFINE_MUTEX(pci_mmcfg_lock);
LIST_HEAD(pci_mmcfg_list);
+/*
+ * raw_pci_read/write - ACPI PCI config space accessors.
+ *
+ * ACPI spec defines MMCFG as the way we can access PCI config space,
+ * so let MMCFG be default (__weak).
+ *
+ * If platform needs more fancy stuff, should provides its own implementation.
+ */
+int __weak raw_pci_read(unsigned int domain, unsigned int bus,
+ unsigned int devfn, int reg, int len, u32 *val)
+{
+ return pci_mmcfg_read(domain, bus, devfn, reg, len, val);
+}
+
+int __weak raw_pci_write(unsigned int domain, unsigned int bus,
+ unsigned int devfn, int reg, int len, u32 val)
+{
+ return pci_mmcfg_write(domain, bus, devfn, reg, len, val);
+}
+
static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus,
unsigned int devfn)
{
--
1.9.1
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