On 24/07/14 14:00, Hanjun Guo wrote:
As PCI for ARM64 is not ready, so introduce some stub functions
to make PCI optional for ACPI, and make ACPI core run without
CONFIG_PCI on ARM64.
Since ACPI on X86 and IA64 depends on PCI and this patch only makes
PCI optinal for ARM64, it will not break anything on X86 and IA64.
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
arch/arm64/include/asm/pci.h | 11 +++++++++++
drivers/acpi/Makefile | 2 +-
drivers/acpi/internal.h | 5 +++++
include/linux/pci.h | 37 +++++++++++++++++++++++++++----------
4 files changed, 44 insertions(+), 11 deletions(-)
create mode 100644 arch/arm64/include/asm/pci.h
diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
new file mode 100644
index 0000000..250cd24
--- /dev/null
+++ b/arch/arm64/include/asm/pci.h
@@ -0,0 +1,11 @@
+#ifndef __ASM_PCI_H
+#define __ASM_PCI_H
+#ifdef __KERNEL__
+
+/*
+ * PCI address space differs from physical memory address space
+ */
+#define PCI_DMA_BUS_IS_PHYS (0)
+
+#endif /* __KERNEL__ */
+#endif /* __ASM_PCI_H */
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 505d4d7..8e9bbe6 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -39,7 +39,7 @@ acpi-y += processor_core.o
acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o
acpi-y += ec.o
acpi-$(CONFIG_ACPI_DOCK) += dock.o
-acpi-y += pci_root.o pci_link.o pci_irq.o
+acpi-$(CONFIG_PCI) += pci_root.o pci_link.o pci_irq.o
acpi-y += acpi_lpss.o
acpi-y += acpi_platform.o
acpi-y += acpi_pnp.o
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 4c5cf77..e1e6487 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -26,8 +26,13 @@
acpi_status acpi_os_initialize1(void);
int init_acpi_device_notify(void);
int acpi_scan_init(void);
+#ifdef CONFIG_PCI
void acpi_pci_root_init(void);
void acpi_pci_link_init(void);
+#else
+static inline void acpi_pci_root_init(void) {}
+static inline void acpi_pci_link_init(void) {}
+#endif
void acpi_processor_init(void);
void acpi_platform_init(void);
void acpi_pnp_init(void);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 466bcd1..27d7354 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
[...]
@@ -1394,6 +1395,23 @@ static inline struct pci_dev *pci_get_bus_and_slot(unsigned int bus,
unsigned int devfn)
{ return NULL; }
+static inline struct pci_bus *pci_find_bus(int domain, int busnr)
+{ return NULL; }
+
+static inline int pci_bus_write_config_byte(struct pci_bus *bus,
+ unsigned int devfn, int where, u8 val)
+{ return -ENODEV; }
+
+static inline int raw_pci_read(unsigned int domain, unsigned int bus,
+ unsigned int devfn, int reg, int len, u32 *val)
+{ return -EINVAL; }
+
+static inline int raw_pci_write(unsigned int domain, unsigned int bus,
+ unsigned int devfn, int reg, int len, u32 val)
+{ return -EINVAL; }
IMO -ENOSYS is more suitable as these functions are not implemented
for !CONFIG_PCI
Regards,
Sudeep
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