[PATCH 6/6] pci, acpi: Share ACPI PCI config space accessors.

Tomasz Nowicki tomasz.nowicki at linaro.org
Wed Nov 19 08:04:51 PST 2014


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 at linaro.org>
Tested-by: Hanjun Guo <hanjun.guo at linaro.org>
---
 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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